Fully-degradable Heat-Insulating Environment-friendly Packaging Bag for Express Delivery

Abstract

A fully-degradable heat-insulating environment-friendly packaging bag for express delivery, comprising a bag body, wherein the bag body has double fabric layers, including an inner layer of hot-rolled non-woven fabric, an outer layer of coated non-woven fabric, and a sandwich layer wherein the sandwich layer is filled with heat-insulating fibers. The bag body is using PLA biodegradable plastic material as base material, and the bag body is produced by spinning PLA, manufacturing thin non-woven fabrics, coating non-woven fabric, printing, forming a bag, and filling the fibers.

Claims

1. A fully-degradable heat-insulating environment-friendly packaging bag for express delivery, characterized in comprising a bag body, wherein the bag body has double fabric layer, including an inner layer of hot-rolled non-woven fabric, an outer layer of coated non-woven fabric, and a sandwich layer wherein the sandwich layer is filled with heat-insulating fibers, wherein the bag body is using PLA biodegradable plastic material as base material, and the bag body is produced by spinning PLA, manufacturing thin non-woven fabric, coating non-woven fabric, printing, forming a bag and filling the fibers.

2. The fully-degradable heat-insulating environment-friendly packaging bag for express delivery according to claim 1, wherein the packaging bag is produced by following processes: (1) spinning PLA, wherein spinning-grade PLA slices are used as raw materials to prepare PLA fibers, including melt spinning using a screw-type spinning machine, wherein the melting point of PLA is 175 C., and the spinning box is using a heating medium with a low boiling point so that it is suitable for PLA, comprising following detailed steps: drying the raw materials until that a water content is less than 30 ppm, setting a screw pre-melting temperature to be 195210 C., setting a screw outlet temperature to be 200215 C., setting a spinning head temperature to be 200210 C., cooling, winding, cutting into sections, and then obtaining PLA short fibers; (2) manufacturing thin non-woven fabrics, wherein PLA short fibers are used as raw materials, and a hot-rolled non-woven fabric equipment is used, including following steps: carding PLA fibers, feeding fibers pneumatically, spreading fibers using a vibrating screen, hot rolling with a couple of roller, and then forming non-woven fabric; (3) coating non-woven fabric, wherein the outer surface of some thin non-woven fabric is coated, and PBAT material is used for the coating, including placing pure PBAT slices into a hopper of a coating machine, into a extruding screw and then forward to a coating die according to designated levels of temperatures, wherein the temperatures of the screw and the die are controlled by a PLC controller of the coating machine, so that temperature control, die extrusion volume and non-woven fabric speed match with one another, wherein the thickness of the coating is effectively controlled to be 2060 g/meter square, and then cooling by a cooling drum; (4) printing, including printing on the coated layer of the non-woven fabrics; (5) forming a bag, so that a bag body with a filling hole on its side is formed; (6) filling fibers, wherein PLA fibers are used as heat-insulating fibers and are filled into the sandwich layer of the bag body, including making PLA fibers fluffy, automatically suctioning the fibers into a filling machine, aligning the filling hole of the bag body with a filling outlet of the filling machine, quantitatively filling the fibers, sealing the filling holes, and obtaining a finished product of a heat-insulating bag.

3. The fully-degradable heat-insulating environment-friendly packaging bag for express delivery according to claim 1, wherein the bag body is being sealed by a zipper, wherein the zipper's chain body and slider are made of composite materials of PLA and PBAT.

4. The fully-degradable heat-insulating environment-friendly packaging bag for express delivery according to claim 3, wherein the chain body of the zipper is made of a mixture of 20% PLA+80% PBAT, and the temperatures of extruder screw of the zipper are set to be 125 C. (feeding inlet), 135 C., 140 C., 145 C., 150 C. (discharge outlet).

5. The fully-degradable heat-insulating environment-friendly packaging bag for express delivery according to claim 3, wherein the slider of the zipper is made of a mixture of 50% PLA+50% PBAT, or a mixture of 50% PLA+50% PBS, wherein it is produced by injection molding using an injection molding machine, and the temperatures of screw are set to be 130 C. (feeding inlet), 150 C., 160 C., 170 C., 180 C. (nozzle), and a draft angle of an injection mould is so designed as to be greater than 5 degrees because of a high viscosity of material.

6. The fully-degradable heat-insulating environment-friendly packaging bag for express delivery according to claim 2, wherein in the step (1), the PLA short fibers are 4D fibers as heat-insulating filling material.

7. The fully-degradable heat-insulating environment-friendly packaging bag for express delivery according to claim 2, wherein in the step (3), the screw is provided with six levels of temperatures, which are 160 C., 190 C., 200 C., 223 C., 223 C., 223 C. in sequence, and the temperature of die is set to be 223 C.

8. The fully-degradable heat-insulating environment-friendly packaging bag for express delivery according to claim 2, wherein in the step (3), the cooling drum in step (3) is equipped with a contact layer of polytetrafluoroethylene on its surface, wherein the surface of the coating contacts the contact layer of polytetrafluoroethylene of the cooling drum.

9. The fully-degradable heat-insulating environment-friendly packaging bag for express delivery according to claim 2, wherein the bag body is being sealed by a zipper, and is manufactured by a non-woven zipper bag making machine, with the following manufacturing processes: feeding double layer of non-woven fabric, automatically welding a zipper on both sides by ultrasonic, folding, automatically installing a slider of zipper, heating by ultrasonic, and cutting into bags, wherein a filling holes is left on a side of a bag.

Description

MODE(S) FOR CARRYING OUT THE INVENTION

[0026] The present invention is further described in detail with reference to the embodiments.

Embodiment 1

[0027] A fully-degradable heat-insulating environmentally-friendly packaging bag for express delivery, comprising a bag body, the bag body has double fabric layers, including an inner layer of hot-rolled non-woven fabric, an outer layer of coated non-woven fabric, and a sandwich layer wherein the sandwich layer is filled with heat-insulating fibers. The bag body is using PLA biodegradable plastic material as base material, and the bag body is being sealed by a zipper, the zipper's chain body and slider are made of composite materials of PLA and PBAT.

[0028] The above packaging bag is produced by spinning PLA, manufacturing thin non-woven fabric, coating non-woven fabric, printing, forming a bag, and filling the fibers. The packaging bag is produced by following steps:

[0029] (1) spinning PLA, spinning-grade PLA slices are used as raw materials to prepare PLA fibers, including melt spinning using a screw-type spinning machine, wherein the melting point of PLA is 175 C., and a spinning box is using a heating medium with a low boiling point so that it is suitable for PLA, comprising following detailed steps: drying the raw materials until that a water content is less than 30 ppm, setting a screw pre-melting temperature to be 200 C., setting a screw outlet temperature to be 215 C., setting a spinning head temperature to be 200 C., cooling, winding, cutting into sections, and then obtaining PLA short fibers;

[0030] (2) manufacturing thin non-woven fabrics, PLA short fibers are used as raw materials and a hot-rolling non-woven fabric equipment is used, including following steps: carding PLA fibers, feeding fibers pneumatically, spreading fibers using a vibrating screen, hot rolling with a couple of rollers, and then forming non-woven fabric;

[0031] (3) coating non-woven fabric, the outer surface of some thin non-woven fabric is coated, and PBAT material is used for the coating, including placing pure PBAT slices into a hopper of a coating machine, into a extruding screw and then forward to a coating die according to designated levels of temperatures, wherein the temperatures of the screw and the die are controlled by a PLC controller of the coating machine, the screw is provided with six levels of temperatures, which are 160 C., 190 C., 200 C., 223 C., 223 C., 223 C. in sequence, and the temperature of die is set to be 223 C., the non-woven fabric speed is set to be 50 g/square meter so that the thickness of the coating is effectively controlled to be 40 g/square meter, and then cooling by a cooling drum;

[0032] (4) printing: including printing on the coated layer of the non-woven fabric, the coating can not only prevent water permeability of heat-insulating bag but also enhance the artistic effect of surface printing;

[0033] (5) forming a bag, so that a bag is formed by a non-woven zipper bag making machine, including following steps: feeding double layers of non-woven fabric, automatically welding a zipper on both sides by ultrasonic, folding, automatically installing a slider of the zipper, heating by ultrasonic, and cutting into bags, wherein a filling hole is left on a side of a bag.

[0034] (6) filling fibers, PLA fibers are used as heat-insulating fibers and are filled into the sandwich layer of the bag body, including making PLA fibers fluffy, automatically suctioning the fibers into a filling machine, aligning the filling hole of the bag body with a filling outlet of the filling machine, quantitatively filling the fibers, sealing the filling hole, and obtaining a finished product of a heat-insulating bag.

[0035] The above chain body is made of a mixture of 20% PLA+80% PBAT, and the temperatures of extruder screw for the zipper are set to be 125 C. (feeding inlet), 135 C., 140 C., 145 C., 150 C. (discharge outlet). The slider of the zipper is made of a mixture of 50% PLA+50% PBAT or a mixture of 50% PLA+50% PBS, and it is produced by injection molding using an injection molding machine, and the temperatures of screw are set to be 130 C. (feeding inlet), 150 C., 160 C., 170 C., 180 C. (nozzle), and a draft angle of an injection mould is so designed as to be 5 degrees because of a high viscosity of material.

[0036] In order to prevent the bonding between the coating surface and the cooling drum, the cooling drum is equipped with a contact layer of polytetrafluoroethylene on its surface, the surface of the coating contacts the contact layer of polytetrafluoroethylene of the cooling drum during cooling.

Embodiment 2

[0037] A fully-degradable heat-insulating environmentally-friendly packaging bag for express delivery is made by spinning PLA, manufacturing thin non-woven fabric, coating non-woven fabric, printing, forming a bag, and filling the fibers. The packaging bag is produced by following steps:

[0038] (1) spinning PLA, spinning-grade PLA slices are used as raw materials to prepare PLA fibers, including melt spinning using a screw-type spinning machine, wherein the melting point of PLA is 175 C., and a spinning box is using a heating medium with a low boiling point so that it is suitable for PLA, comprising following detailed steps: drying the raw materials until that a water content is less than 30 ppm, setting a screw pre-melting temperature to be 210 C., setting a screw outlet temperature to be 200 C., setting a spinning head temperature to be 210 C., cooling, winding, cutting into sections, and then obtaining PLA short fibers;

[0039] (2) manufacturing thin non-woven fabrics, PLA short fibers are used as raw materials and a hot-rolling non-woven fabric equipment is used, including following steps: carding PLA fibers, feeding fibers pneumatically, spreading fibers using a vibrating screen, hot rolling with a couple of rollers, and then forming non-woven fabric;

[0040] (3) coating non-woven fabric, the outer surface of some thin non-woven fabric is coated, and PBAT material is used for the coating, including placing pure PBAT slices into a hopper of a coating machine, into a extruding screw and then forward to a coating die according to designated levels of temperatures, wherein the temperatures of the screw and the die are controlled by a PLC controller of the coating machine, the screw is provided with six levels of temperatures, which are 160 C., 190 C., 200 C., 223 C., 223 C., 223 C. in sequence, and the temperature of die is set to be 223 C., the non-woven fabric speed is set to be 50 g/square meter so that the thickness of the coating is effectively controlled to be 40 g/square meter, and then cooling by a cooling drum;

[0041] (4) printing, including printing on the coated layer of the non-woven fabric, the coating can not only prevent water permeability of heat-insulating bag but also enhance the artistic effect of surface printing;

[0042] (5) forming a bag, so that a bag is formed by a non-woven zipper bag making machine, including following steps: feeding double layers of non-woven fabric, automatically welding a zipper on both sides by ultrasonic, folding, automatically installing a slider of the zipper, heating by ultrasonic, and cutting into bags, wherein a filling hole is left on a side of a bag.

[0043] (6) filling fibers, PLA fibers are used as heat-insulating fibers and are filled into the sandwich layer of the bag body, including making PLA fibers fluffy, automatically suctioning the fibers into a filling machine, aligning the filling hole of the bag body with a filling outlet of the filling machine, quantitatively filling the fibers, sealing the filling hole, and obtaining a finished product of a heat-insulating bag.

[0044] The above chain body is made of a mixture of 20% PLA+80% PBAT, and the temperatures of extruder screw for the zipper are set to be 125 C. (feeding inlet), 135 C., 140 C., 145 C., 150 C. (discharge outlet). The slider of the zipper is made of a mixture of 50% PLA+50% PBAT or a mixture of 50% PLA+50% PBS, and it is produced by injection molding using an injection molding machine, and the temperatures of screw are set to be 130 C. (feeding inlet), 150 C., 160 C., 170 C., 180 C. (nozzle), and a draft angle of an injection mould is so designed as to be 5 degrees because of a high viscosity of material.

[0045] In order to prevent the bonding between the coating surface and the cooling drum, the cooling drum is equipped with a contact layer of polytetrafluoroethylene on its surface, the surface of the coating contacts the contact layer of polytetrafluoroethylene of the cooling drum during cooling.

[0046] Performance test data of Embodiment 1 and 2 are shown in below table

TABLE-US-00001 Permeability Tensile Property Tear Property GB/T1037-1988 BS EN ISO 13934-2: 2014 BS EN ISO 13937-1: 2000 Object PLA Thin Non- PLA Thin Non- PLA Thin Non- Bag Body wovne Fabric Bag Body woven Fabric Bag Body woven Fabric Unit Test Method g .Math. m.sup.2 .Math. d.sup.1 WARP/N WEFT/N WARP/N WEFT/N WARP/N WEFT/N WARP/N WEFT/N Embodiment 1 309 867 50 40 30 40 3.2 3.9 7.4 4.3 Embodiment 2 313 866 52 41 30 43 3.3 3.9 7.6 4.4

[0047] The raw material of present application is very simple, free of addition of any other chemicals. By optimizing the technique design, a fully-degradable packaging bag with a single raw material is obtained in real sense.

[0048] Besides above embodiments, the present invention also includes other embodiments, and any technical solution formed by equivalent transformation or equivalent substitution shall fall within the scope of protection of the claims of the present invention.