Method for preparing hydrophilic writing sliced bamboo veneer

Abstract

Disclosed is a method for preparing a hydrophilic writing sliced bamboo veneer, including, in sequence, the following steps: (1) processing a sliced bamboo veneer into thin bamboo sheets with a thickness of 0.2-0.6 mm; (2) selecting the thin bamboo sheets with less color difference and fewer processing defects, and rolling the selected thin bamboo sheets on a plane; (3) performing deburring, sanding, and surface polishing on the rolled thin bamboo sheets; (4) performing mildewproofing and mothproofing treatment on the thin bamboo sheets; (5) performing surface coating treatment on the thin bamboo sheets using a coating material; (6) drying the coated thin bamboo sheets at low temperature; (7) fine-polishing the dried thin bamboo sheets; (8) cutting the thin bamboo sheets; and (9) flattening, compacting, and piling the cut thin bamboo sheets for future use.

Claims

1. A method for preparing a hydrophilic writing sliced bamboo veneer, comprising, in sequence, steps of: (1)processing a sliced bamboo veneer into thin bamboo sheets with a thickness of 0.2-0.6 mm; (2) selecting the thin bamboo sheets, and rolling the selected thin bamboo sheets on a plane; (3) performing deburring, sanding, and surface polishing on the rolled thin bamboo sheets; (4) performing mildewproofing and mothproofing treatment on the thin bamboo sheets; (5) performing surface coating treatment on the thin bamboo sheets using a coating material; (6) drying the coated thin bamboo sheets at low temperature; (7) fine-polishing the dried thin bamboo sheets; (8) cutting the thin bamboo sheets; (9) flattening, compacting, and piling the cut thin bamboo sheets for future use; wherein the coating material used in Step (5) is prepared from a coupling agent, a stabilizing agent, and a penetrating agent and at a beginning of preparation of the coating material, a volume ratio of the three agents is 60-70% of the coupling agent to 15-25% of the stabilizing agent to 10-15% of the penetrating agent, totaling 100%, and Step (5) further comprising steps of: (5-1) pouring the coupling agent into a reaction kettle, heating to 70-80° C., agitating for 30-60 seconds in an agitator with a rotational speed of 200 rpm; (5-2) introducing the stabilizing agent into the reaction kettle, holding the temperature at 70-80° C., agitating for 120 seconds in the agitator with a rotational speed of 550-600 rpm; and (5-3) cooling an internal temperature of the reaction kettle to room temperature, introducing the penetrating agent into the reaction kettle, and agitating for 120 seconds in the agitator with a rotational speed of 550-600 rpm.

2. The method of claim 1, wherein in Step (2), roller compaction is executed using an opposite-roller compaction machine, which has a pair of steel rollers that contact mutually and roll in opposite directions, in which an upper roller of the steel rollers has a surface formed with raised patterns while a lower roller of the steel rollers has a smooth surface.

3. The method of claim 2, wherein the patterns form a mountain grain, having a line thickness of 0.8-1 mm and a flange height of 0.5-0.6 mm.

4. The method of claim 1 or 2 or 3, wherein the mildewproofing and the mothproofing treatment in Step (4) uses a water-based mildewproofing agent and is followed by oven drying.

5. The method of claim 4, wherein the oven drying is performed at a temperature of 80-90° C.

6. The method of claim 1 or 2 or 3, wherein the low temperature for the drying of Step (6) ranges between room temperature and 60° C.

7. The method of claim 1 or 2 or 3, wherein in Step (9) the cut thin bamboo sheets rest in piles for 3-7 days.

8. The method of claim 7, wherein an ambient humidity for storage of the piles of the thin bamboo sheets is controlled at 10%-20%.

9. The method of claim 1 or 2 or 3, wherein the sliced bamboo veneer is replaced by a sliced wood veneer or a rotary cut wood veneer, in which the sliced wood veneer refers to xylem collected from a tree and processed using the process for preparing the sliced bamboo veneer while the rotary cut wood veneer refers to xylem obtained from a tree using rotary cutting and processed using the process for preparing the sliced bamboo veneer.

Description

DETAILED DESCRIPTION OF THE INVENTION

(1) The invention as well as a preferred mode of use, further objectives and advantages thereof will be best understood by reference to the following detailed description of illustrative embodiments when read in conjunction with the accompanying drawings.

(2) In one embodiment of the present invention, a method for preparing hydrophilic writing sliced bamboo veneer primarily comprising the following steps in sequence:

(3) (1) processing a bamboo veneer into bamboo sheets having a thickness of 0.4 mm;

(4) (2) selecting the thin bamboo sheets with less color difference and fewer processing defects, and rolling the selected thin bamboo sheets on a plane, wherein according to the present embodiment an opposite-roller compaction machine used for this step has a pair of steel rollers that contact mutually at surfaces and roll in opposite directions, and the upper roller has its surface formed with raised tiny patterns while the lower roller has a smooth surface, in which the patterns form a mountain grain, having a line thickness of 0.8-1 mm and a flange height of flange height of 0.5-0.6 mm;

(5) (3) performing deburring, sanding, and surface polishing on the rolled thin bamboo sheets;

(6) (4) performing mildewproofing and mothproofing treatment on the thin bamboo sheets, wherein the step is conducted using a water-based mildewproofing agent supplied by Hangzhou Hangzhou Johnson Sylvan Inc. is followed by oven drying at a temperature of 80-90° C.;

(7) (5) performing surface coating treatment on the thin bamboo sheets using a coating material; wherein the coating material is made up by a coupling agent, a stabilizing agent, and a penetrating agent and at the beginning of the preparation, a volume ratio of the three agents is 60-70% of the coupling agent to 15-25% of the stabilizing agent to 10-15% of the penetrating agent, totaling 100%, in which the three agents may be a coupling agent supplied by Hangzhou Sheng-Di-Wei-Ka Industry and Trading Co., Ltd. and modeled “ZW07” with a purity of 96%; a stabilizing agent supplied by Hangzhou Rui-Zhu Technology Co., Ltd. and modeled “WD1705;” and a penetrating agent supplied by Hangzhou Hangzhou Johnson Sylvan Inc. and modeled “CT609,” the preparation comprising the following steps:

(8) (5-1) pouring the coupling agent into a reaction kettle, heating to 70° C., agitating for 40 seconds in an agitator with a rotational speed of 200 rpm;

(9) (5-2) introducing the stabilizing agent into the reaction kettle, holding the temperature at 70° C., agitating for 120 seconds in the agitator with a rotational speed of 600 rpm; and

(10) (5-3) cooling an internal temperature of the reaction kettle to room temperature, introducing the penetrating agent into the reaction kettle, and agitating for 120 seconds in the agitator with a rotational speed of 600 rpm;

(11) (6) drying the coated thin bamboo sheets at low temperature, with the drying temperature controlled between room temperature and 60° C.;

(12) (7) fine-polishing the dried thin bamboo sheets;

(13) (8) cutting the thin bamboo sheets to meet the dimensional requirements for writing and printing; and

(14) (9) flattening, compacting, and piling the cut thin bamboo sheets for future use, wherein the cut thin bamboo sheets rest in piles for 3-7 days while the ambient humidity for storage of the bamboo sheet piles is controlled at 20%.

(15) The material for preparing the sliced bamboo veneer of the present embodiment is prepared as taught by China Patent Document No. CN1465473A, titled “Improved planed thin bamboo and productive method thereof” and published on Jan. 7, 2004. Alternatively, a sliced wood veneer or a rotary cut wood veneer may be used instead of the sliced bamboo veneer. The sliced wood veneer refers to xylem collected from trees and processed using the process for preparing the disclosed sliced bamboo veneer. The rotary cut wood veneer refers to xylem obtained from trees using rotary cutting and processed using the process for preparing the disclosed sliced bamboo veneer.

(16) The hydrophilic writing sliced bamboo veneer prepared according to the present embodiment meets China National Standards No. GB/T22828-2008 for Painting and Calligraphy Paper. As compared to traditional painting and calligraphy paper prepared from plant fibers, the hydrophilic writing sliced bamboo veneer of the present invention has comparable apparent density, brightness, breaking length, tearing resistance, wet tensile strength, water absorption, dimensional stability and dirt count, and even surpasses competitor products in some certain indicators. The hydrophilic writing sliced bamboo veneer of the present invention has gained recognition from Chinese brush calligraphy artists and when used for machine printing, provides good color reproduction and good penetration that leads to clear front-and-back color structures without reflection and glare, making it suitable for quality painting and calligraphy works.