EASY-PRINT PACKAGING SHEET AND MANUFACTURING METHOD THEREFOR

Abstract

An easy-print packaging sheet and a manufacturing method therefor. Raw materials of the easy-print packaging sheet contain polyethylene; the smoothness of the packaging sheet is 70-250 seconds; the drape coefficient of the packaging sheet is 78-92%; the burst index of the packaging sheet is 8-15 kPa.Math.m.sup.2/g; and the light shielding rate of the packaging sheet is 85-95%. The packaging sheet having good comprehensive performance is prepared by means of a flash spinning process and the improvement of raw materials and a spinning process.

Claims

1. An easy-print packaging sheet, characterized by comprising polyethylene as a raw material; a smoothness of the packaging sheet being 70-250 seconds, a drape coefficient of the packaging sheet being 78-92%, a burst index of the packaging sheet being 8-15 kPa.Math.m.sup.2/g, and a light shielding rate of the packaging sheet being 85-95%.

2. The easy-print packaging sheet of claim 1, characterized in that the smoothness of the packaging sheet is 200-250 seconds.

3. The easy-print packaging sheet of claim 1, characterized in that the smoothness of the packaging sheet is 70-100 seconds.

4. The easy-print packaging sheet of claim 1, characterized in that the drape coefficient of the packaging sheet is 80-85%.

5. The easy-print packaging sheet of claim 1, characterized in that the drape coefficient of the packaging sheet is 85-90%.

6. The easy-print packaging sheet of claim 1, characterized in that the burst index of the packaging sheet is 9-10 kPa.Math.m.sup.2/g.

7. The easy-print packaging sheet of claim 1, characterized in that the burst index of the packaging sheet is 10-11 kPa.Math.m.sup.2/g.

8. The easy-print packaging sheet of claim 1, characterized in that the burst index of the packaging sheet is 11-12 kPa.Math.m.sup.2/g.

9. The easy-print packaging sheet of claim 1, characterized in that the light shielding rate of the packaging sheet is 89.5-90%.

10. The easy-print packaging sheet of claim 1, characterized in that the light shielding rate of the packaging sheet is 90-90.5%.

11. The easy-print packaging sheet of claim 1, characterized in that the raw material comprises polyethylene and a carbon nanoflower packaging material that is present in the packaging sheet in a mass fraction of 1-3%.

12. A method for manufacturing an easy-print packaging sheet, characterized by comprising the following technical steps: dissolving polyethylene and a carbon nanoflower packaging material into a spinning solvent to form a spinning solution, and performing flash spinning on the spinning solution at 160-240? C. to obtain a flash-spinning fiber, performing lapping, hot pressing and lustring on the flash-spinning fiber to obtain the packaging sheet, wherein a hot pressing temperature is 110-130? C., a lustring temperature is 120-125? C., and a lustring pressure is 40-48 Kg/cm.

Description

DETAILED DESCRIPTION OF EMBODIMENTS

[0064] Provided are detailed embodiments of an easy-print packaging sheet and a manufacturing method therefor of the present invention below.

Test Method

(I) Smoothness: GB/T 456-2002 Paper and Board-Determination of Smoothness (Bekk Method)

[0065] The test was performed in accordance with the national standard; 10 samples were taken and tested to obtain their front and back smoothness, and then the smoothness values were averaged to obtain the front smoothness and back smoothness of the sample, respectively. It can be seen that there exists certain difference between the front and back smoothness.

(II) Drape Coefficient: GB/T 23329-2009 Textiles-Determination of Drapability of Fabrics

[0066] The test was performed in accordance with the national standard, specifically according to method A, a paper loop method; a gripping dish diameter is 18 cm and sample diameter is 30 cm. 6 parts of samples were taken and tested three times on the front, and tested three times on the back; the values obtained were averaged to obtain the drape coefficient of the sample.

(III) Burst Index: GB/T 1539-2007/IS02759: 2001 Paperboard-Determination of Bursting Strength

[0067] The test was performed in accordance with the national standard. Burst index refers to quantification that bursting strength divides by paperboard, where burst index is the maximum pressure when paper-like circular area is burst by an elastic rubber membrane under the pressure of a hydraulic system. 20 samples were taken and tested, then values were averaged to obtain the burst index.

(IV) Light Shielding Rate: FZ/T 01009-2008 Textiles-Determination of the Luminous Transmittance of Fabrics

[0068]
Definition: Light shielding rate=1?total luminous flux transmittance

[0069] where the total luminous flux transmittance refers to a ratio of the luminous flux of a parallel beam transmitted through a test sample to the incident flux.

[0070] The test was performed in accordance with the textile industry standard. 5 samples were tested and averaged to obtain the total luminous flux transmittance, and then the light shielding rate was obtained according to the above formula.

(V) Anti-Mould Grade GB/T 24346-2009 Textiles-Evaluation for Anti-Mould Activity

[0071] The test was performed in accordance with the national standard. 6 pieces of samples were taken and tested, and averaged, and then the anti-mould grade of the sample was calculated. Strains are Aspergillus niger CGMCC 3.5487, Chaetomium globasum CGMCC 3.3601, Penicillium funiculosum CGMCC3.3875, and Trichoderma viride CGMCC 3.2941. The anti-mould activity was tested at the parameters of constant temperature and constant humidity: 28? C.?1? C., 90%+2%; incubation time was 28 days.

(VI) Antibacterial Ratio: GB/T 20944.2-2007 Textiles-Evaluation for Antibacterial Activity-Part 2: Absorption Method

[0072] The test was performed in accordance with the national standard. 3 pieces of samples were taken and tested, and averaged, and then the antibacterial ratio of the sample was calculated. Strains for the antibacterial test are Staphylococcus aureus, Klebsiella pneumoniae and Escherichia coli; culture conditions: 37? C.?2? C. and 90%+2%, incubation time: 18-24 hours.

[0073] The antibacterial ratio (antibacterial rate) shows that more than 95% has antibacterial property, and it has a better antibacterial property when greater than 98%.

Example 1

[0074] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

() (I) Preparation of the Carbon Nanoflower Packaging Material:

[0075] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0076] a mass ratio of the carbon nanoflower to copper chloride was 1:0.5; [0077] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.5; [0078] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0079] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0080] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 10% in the spinning solution.

[0081] The carbon nanoflower packaging material had a mass fraction of 1% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0082] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0083] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 200? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 110? C., the lustring temperature was 120? C., and the lustring pressure was 40 Kg/cm.

[0084] Test data of the Example 1 is shown in Table 1.

Example 2

[0085] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0086] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0087] a mass ratio of the carbon nanoflower to copper chloride was 1:0.6; [0088] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.6; [0089] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0090] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0091] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 10.5% in the spinning solution.

[0092] The carbon nanoflower packaging material had a mass fraction of 1.5% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0093] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0094] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 205? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 115? C., the lustring temperature was 121? C., and the lustring pressure was 42 Kg/cm.

[0095] Test data of the Example 2 is shown in Table 1.

Example 3

[0096] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0097] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0098] a mass ratio of the carbon nanoflower to copper chloride was 1:0.7; [0099] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.7; [0100] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0101] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0102] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 11% in the spinning solution.

[0103] The carbon nanoflower packaging material had a mass fraction of 2% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0104] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0105] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 210? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 120? C., the lustring temperature was 123? C., and the lustring pressure was 44 Kg/cm.

[0106] Test data of the Example 3 is shown in Table 1.

Example 4

[0107] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0108] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0109] a mass ratio of the carbon nanoflower to copper chloride was 1:0.8; [0110] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.8; [0111] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0112] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0113] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 11.5% in the spinning solution.

[0114] The carbon nanoflower packaging material had a mass fraction of 2.5% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0115] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0116] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 215? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 125? C., the lustring temperature was 124? C., and the lustring pressure was 46 Kg/cm.

[0117] Test data of the Example 4 is shown in Table 1.

Example 5

[0118] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0119] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0120] a mass ratio of the carbon nanoflower to copper chloride was 1:0.9; [0121] a mass ratio of the carbon nanoflower to magnesium chloride was 1:3; [0122] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0123] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0124] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 12% in the spinning solution.

[0125] The carbon nanoflower packaging material had a mass fraction of 3% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0126] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0127] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 220? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 130? C., the lustring temperature was 125? C., and the lustring pressure was 48 Kg/cm.

[0128] Test data of the Example 5 is shown in Table 1.

Example 6

[0129] A method for manufacturing an easy-print polypropylene packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0130] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0131] a mass ratio of the carbon nanoflower to copper chloride was 1:0.5; [0132] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.5; [0133] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0134] The carbon nanoflower packaging material prepared in step (I) and polypropylene were dissolved into a spinning solvent to obtain the spinning solution; and [0135] the mixture of the carbon nanoflower packaging material and polypropylene had a mass fraction of 10% in the spinning solution.

[0136] The carbon nanoflower packaging material had a mass fraction of 1% in the mixture of the carbon nanoflower packaging material and polypropylene.

[0137] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Polypropylene Packaging Sheet:

[0138] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 200? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the polypropylene packaging sheet, wherein the hot pressing temperature was 110? C., the lustring temperature was 120? C., and the lustring pressure was 40 Kg/cm.

[0139] Test data of the Example 6 is shown in Table 1.

Example 7

[0140] A method for manufacturing an easy-print polypropylene packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0141] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0142] a mass ratio of the carbon nanoflower to copper chloride was 1:0.7; [0143] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.7; [0144] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0145] The carbon nanoflower packaging material prepared in step (I) and polypropylene were dissolved into a spinning solvent to obtain the spinning solution; and [0146] the mixture of the carbon nanoflower packaging material and polypropylene had a mass fraction of 11% in the spinning solution.

[0147] The carbon nanoflower packaging material had a mass fraction of 2% in the mixture of the carbon nanoflower packaging material and polypropylene.

[0148] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Polypropylene Packaging Sheet:

[0149] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 210? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the polypropylene packaging sheet, wherein the hot pressing temperature was 120? C., the lustring temperature was 123? C., and the lustring pressure was 44 Kg/cm.

[0150] Test data of the Example 7 is shown in Table 1.

Example 8

[0151] A method for manufacturing an easy-print polypropylene packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0152] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0153] a mass ratio of the carbon nanoflower to copper chloride was 1:0.9; [0154] a mass ratio of the carbon nanoflower to magnesium chloride was 1:3; [0155] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0156] The carbon nanoflower packaging material prepared in step (I) and polypropylene were dissolved into a spinning solvent to obtain the spinning solution; and [0157] the mixture of the carbon nanoflower packaging material and polypropylene had a mass fraction of 12% in the spinning solution.

[0158] The carbon nanoflower packaging material had a mass fraction of 3% in the mixture of the carbon nanoflower packaging material and polypropylene.

[0159] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Polypropylene Packaging Sheet:

[0160] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 220? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the polypropylene packaging sheet, wherein the hot pressing temperature was 130? C., the lustring temperature was 125? C., and the lustring pressure was 48 Kg/cm.

[0161] Test data of the Example 8 is shown in Table 1.

Comparative Example 1

[0162] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0163] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0164] a mass ratio of the carbon nanoflower to copper chloride was 1:0.7; [0165] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.7; [0166] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0167] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0168] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 11% in the spinning solution.

[0169] The carbon nanoflower packaging material had a mass fraction of 3.5% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0170] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0171] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 210? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 120? C., the lustring temperature was 123? C., and the lustring pressure was 44 Kg/cm.

[0172] Test data of the Comparative Example 1 is shown in Table 1.

Comparative Example 2

[0173] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0174] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0175] a mass ratio of the carbon nanoflower to copper chloride was 1:0.7; [0176] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.7; [0177] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0178] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0179] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 11% in the spinning solution.

[0180] The carbon nanoflower packaging material had a mass fraction of 4% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0181] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0182] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 210? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 120? C., the lustring temperature was 123? C., and the lustring pressure was 44 Kg/cm.

[0183] Test data of the Comparative Example 2 is shown in Table 1.

Comparative Example 3

[0184] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0185] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0186] a mass ratio of the carbon nanoflower to copper chloride was 1:0.7; [0187] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.7; [0188] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0189] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0190] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 11% in the spinning solution.

[0191] The carbon nanoflower packaging material had a mass fraction of 5% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0192] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0193] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 210? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 120? C., the lustring temperature was 123? C., and the lustring pressure was 44 Kg/cm.

[0194] Test data of the Comparative Example 3 is shown in Table 1.

Comparative Example 4

[0195] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0196] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0197] a mass ratio of the carbon nanoflower to copper chloride was 1:0.7; [0198] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.7; [0199] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0200] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0201] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 11% in the spinning solution.

[0202] The carbon nanoflower packaging material had a mass fraction of 0.5% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0203] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0204] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 210? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 120? C., the lustring temperature was 123? C., and the lustring pressure was 44 Kg/cm.

[0205] Test data of the Comparative Example 4 is shown in Table 1.

Comparative Example 5

[0206] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0207] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0208] a mass ratio of the carbon nanoflower to copper chloride was 1:0.7; [0209] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.7; [0210] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0211] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0212] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 11% in the spinning solution.

[0213] The carbon nanoflower packaging material had a mass fraction of 2% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0214] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0215] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 210? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 120? C., the lustring temperature was 123? C., and the lustring pressure was 33 Kg/cm.

[0216] Test data of the Comparative Example 5 is shown in Table 1.

Comparative Example 6

[0217] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0218] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0219] a mass ratio of the carbon nanoflower to copper chloride was 1:0.7; [0220] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.7; [0221] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0222] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0223] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 11% in the spinning solution.

[0224] The carbon nanoflower packaging material had a mass fraction of 2% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0225] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0226] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 210? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 120? C., the lustring temperature was 123? C., and the lustring pressure was 38 Kg/cm.

[0227] Test data of the Comparative Example 6 is shown in Table 1.

Comparative Example 7

[0228] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0229] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0230] a mass ratio of the carbon nanoflower to copper chloride was 1:0.7; [0231] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.7; [0232] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0233] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0234] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 11% in the spinning solution.

[0235] The carbon nanoflower packaging material had a mass fraction of 2% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0236] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0237] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 210? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 120? C., the lustring temperature was 123? C., and the lustring pressure was 53 Kg/cm.

[0238] Test data of the Comparative Example 7 is shown in Table 1.

Comparative Example 8

[0239] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the Carbon Nanoflower Packaging Material:

[0240] The carbon nanoflower, copper chloride, and magnesium chloride were dissolved into a potassium hydroxide solution; ultrasonically stirred and mixed to generate a primary precipitate, the primary precipitate was heated and dried at a heating temperature of 180-190? C. for 1-2 hours to obtain an intermediate precipitate; the intermediate precipitate was calcinated at a calcination temperature of 320-360? C. for 2-3 hours to obtain the carbon nanoflower packaging material; [0241] a mass ratio of the carbon nanoflower to copper chloride was 1:0.7; [0242] a mass ratio of the carbon nanoflower to magnesium chloride was 1:2.7; [0243] a mass ratio of the carbon nanoflower to potassium hydroxide was 1:18; and potassium hydroxide was kept excessive in the potassium hydroxide solution.

(II) Preparation of the Spinning Solution:

[0244] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0245] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 11% in the spinning solution.

[0246] The carbon nanoflower packaging material had a mass fraction of 2% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0247] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0248] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 210? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 120? C., the lustring temperature was 123? C., and the lustring pressure was 57 Kg/cm.

[0249] Test data of the Comparative Example 8 is shown in Table 1.

Comparative Example 9

[0250] A method for manufacturing an easy-print packaging sheet, including the following technical steps:

(I) Preparation of the carbon nanoflower packaging material: carbon nanoflower, magnesium oxide, and copper oxide were mixed to obtain the carbon nanoflower packaging material, where a mass ratio of the carbon nanoflower to copper oxide was 1:0.7, and a mass ratio of the carbon nanoflower to magnesium oxide was 1:2.7;

(II) Preparation of the Spinning Solution:

[0251] The carbon nanoflower packaging material prepared in step (I) and polyethylene were dissolved into a spinning solvent to obtain the spinning solution; and [0252] the mixture of the carbon nanoflower packaging material and polyethylene had a mass fraction of 11% in the spinning solution.

[0253] The carbon nanoflower packaging material had a mass fraction of 2% in the mixture of the carbon nanoflower packaging material and polyethylene.

[0254] The spinning solvent was a mixture of 1,2-dichloroethylene, trichlorofluoromethane, 2,3 dihydrodecafluoropentane, and 1,1,1,3,3-pentafluoropropane having a mass ratio of 3:5:1:1.

(III) Preparation of the Packaging Sheet:

[0255] The spinning solution prepared in step (II) was subjected to flash spinning at a spinning temperature of 210? C. to obtain a flash-spinning fiber, and then lapped, hot pressed and lustered to obtain the packaging sheet, wherein the hot pressing temperature was 120? C., the lustring temperature was 123? C., and the lustring pressure was 44 Kg/cm.

[0256] Test data of the Comparative Example 9 is shown in Table 1.

TABLE-US-00001 TABLE 1 Performance data table of the examples and comparative examples Smooth- Light ness Drape Burst shield- Anti- Anti- (seconds) co- index ing mould bacterial Front Back efficient kPa .Math. m.sup.2/g rate grade ratio Ex- 209 80 90.1% 9.3 90.8% 1 97.1% ample 1 Ex- 213 84 88.2% 10.6 90.3% 1 97.8% ample 2 Ex- 225 88 86.5% 11.6 89.8% 0 98.5% ample 3 Ex- 231 92 83.8% 12.3 89.5% 0 98.7% ample 4 Ex- 245 95 80.4% 13.1 89.2% 0 99.1% ample 5 Ex- 216 82 85.3% 12.6 91.8% 1 97.8% ample 6 Ex- 237 90 81.2% 15.9 88.8% 0 98.8% ample 7 Ex- 256 98 75.8% 17.2 86.2% 0 99.4% ample 8 Com- 257 106 78.7% 13.0 88.6% 0 99.2% parative Ex- ample 1 Com- 263 119 77.1% 12.7 86.9% 0 99.3% parative Ex- ample 2 Com- 286 142 74.5% 12.4 83.2% 0 99.4% parative Ex- ample 3 Com- 189 77 91.6% 7.6 91.2% 3 91.6% parative Ex- ample 4 Com- 182 55 89.4 8.8 95.6% 2 96.8% parative Ex- ample 5 Com- 202 69 87.9 9.7 92.7% 2 97.6% parative Ex- ample 6 Com- 253 101 84.2 12.8 85.3% 0 98.9% parative Ex- ample 7 Com- 277 132 81.8 13.5 81.4% 0 99.0% parative Ex- ample 8 Com- 205 72 84.3 6.6 86.7% 3 80.5% parative Ex- ample 9 Note: the unit of smoothness is second, and the unit of burst index is kPa .Math. m.sup.2/g.

[0257] What is described are preferred embodiments of the present invention. It should be indicated that those skilled in the art could make several improvements and embellishments in the premise of not departing from the inventive concept. These improvements and embellishments should be regarded within the protection scope of the present invention.