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Biodegradable composite film for automatic packaging machine and preparation method of biodegradable composite film

An automatic packaging machine, biodegradable technology, applied in packaging, wrapping paper, biological packaging, etc., can solve the problems of difficult recycling, high recycling cost, white pollution, etc., and achieve excellent oxygen and water resistance performance, excellent anti-hydrolysis performance. Effect

Inactive Publication Date: 2022-01-18
丹阳恒绿新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Technical problem to be solved: In view of the current situation of serious "white pollution" caused by a large number of discarded non-degradable automatic packaging bags, difficult recycling, and high recycling costs, the invention provides a biodegradable composite film for automatic packaging machines and its preparation method
In addition, different film-making processes are used to further widen the temperature resistance gap between the inner and outer base films, so that the inner film is effectively heat-sealed while the outer film will not be damaged; 2. A combination of multiple methods is used to solve the problem. Disadvantages of poor barrier properties of biodegradable materials: improve the barrier performance of the composite film to water vapor by vacuum evaporation; improve the barrier performance of the composite film to oxygen by coating modified PVA solution; preferably a binder with barrier properties It can fill the defects during vacuum evaporation and coating while ensuring the composite adhesion of the film, thereby further improving the comprehensive barrier property of the composite film; 3. Combining high-mixing treatment technology of inorganic powder Combining with advanced technology, the inner base film is prepared. The inner base film has the comprehensive properties of low temperature heat sealing, strong hydrolysis resistance, and meeting the requirements of coating process.

Method used

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  • Biodegradable composite film for automatic packaging machine and preparation method of biodegradable composite film
  • Biodegradable composite film for automatic packaging machine and preparation method of biodegradable composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Polylactic acid (PLA, M W 200000, the optical purity is 96% (L) 95 parts, 5 parts of 2525, 0.5 parts of nano-barium sulfate, and 0.3 parts of white oil are mixed evenly and then added to a parallel twin-screw extruder, melt-blended and air-cooled and pelletized. The melt temperature of the twin-screw extruder is 180 ° C. Prepare Special modified material for the base film layer of the surface layer;

[0036] (2) prepare the surface layer base film with the special modified material for the surface layer base film layer prepared in step (1) through biaxial stretching equipment, the biaxial stretch ratio is 3 * 3, the thickness of the film is 25 microns, and the base layer Corona treatment is performed on one side of the film, and the surface energy of the corona surface after treatment is ≧42dyne;

[0037] (3) The inner surface of the surface base film prepared in step (2) is printed with water-based ink, and the diluent used during printing is a mixture of water ...

Embodiment 2

[0044] (1) Polylactic acid (PLA, M W 200000, the optical purity is 96% (L) 95 parts, 5 parts of 2525, 0.5 parts of nano-barium sulfate, and 0.3 parts of white oil are mixed evenly and then added to a parallel twin-screw extruder, melt-blended and air-cooled and pelletized. The melt temperature of the twin-screw extruder is 180 ° C. Prepare Special modified material for the base film layer of the surface layer;

[0045] (2) prepare the surface layer base film with the special modified material for the surface layer base film layer prepared in step (1) through biaxial stretching equipment, the biaxial stretch ratio is 3 * 3, the thickness of the film is 25 microns, and the base layer Corona treatment is performed on one side of the film, and the surface energy of the corona surface after treatment is ≧42dyne;

[0046] (3) The inner surface of the surface base film prepared in step (2) is printed with water-based ink, and the diluent used during printing is a mixture of water ...

Embodiment 3

[0053] (1) Polylactic acid (PLA, M W 200000, the optical purity is 96% (L) 95 parts, 5 parts of 2525, 0.5 parts of nano-barium sulfate, and 0.3 parts of white oil are mixed evenly and then added to a parallel twin-screw extruder, melt-blended and air-cooled and pelletized. The melt temperature of the twin-screw extruder is 180 ° C. Prepare Special modified material for the surface base film layer;

[0054] (2) prepare the surface layer base film with the special modified material for the surface layer base film layer prepared in step (1) through biaxial stretching equipment, the biaxial stretch ratio is 3 * 3, the thickness of the film is 25 microns, and the base layer Corona treatment is performed on one side of the film, and the surface energy of the corona surface after treatment is ≧42dyne;

[0055] (3) The inner surface of the surface base film prepared in step (2) is printed with water-based ink, and the diluent used during printing is a mixture of water and absolute ...

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Abstract

The invention discloses a biodegradable composite film for an automatic packaging machine and a preparation method of the biodegradable composite film. The composite film is sequentially composed of a surface base film layer, a printing layer, a first bonding layer, a blocking layer, a second bonding layer, a coating layer and an inner base film layer from outside to inside. The composite film is excellent in barrier property and printing performance, the inner layer material and the outer layer material have remarkable temperature resistance difference, the composite film can be normally used on the automatic packaging machine, the biological decomposition rate can reach 90% or above within 180 days in an industrial composting state, the EN13432 and ASTMD6400 standards are met, and the composite film has important significance in solving the problem of white pollution caused by discarding of existing film bags for the automatic packaging machine.

Description

technical field [0001] The invention belongs to the field of food packaging and relates to a film for an automatic packaging machine, more specifically to a biodegradable composite film and a preparation method thereof. Background technique [0002] With the development of automation technology and the increase of labor costs, automatic packaging equipment has been widely used in the field of food and pharmaceutical packaging, such as packaging of powdered coffee, biscuits, jelly, powdered medicine, etc. As the main consumables in automatic packaging of food or medicine, the choice of composite film is extremely critical. Due to the different properties of different inner packages, the requirements for packaging films are also different, but they must meet the following basic requirements: excellent printing performance, excellent barrier properties, and the inner and outer materials must have significant resistance. Temperature difference (heat is conducted from the outer ...

Claims

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Application Information

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IPC IPC(8): B32B27/36B32B7/12B32B27/10B32B29/06B32B27/08B32B27/06B32B33/00B32B7/027B65D65/40B65D65/42B29C48/08B29C48/40B29C48/285B29C48/92C08L67/04C08L91/06C08K3/30C08K3/34C08J5/18C08L69/00C08L67/02
CPCB32B27/36B32B7/12B32B27/10B32B29/06B32B27/08B32B27/365B32B33/00B32B7/027B65D65/40B65D65/42B29C48/08B29C48/40B29C48/287B29C48/288B29C48/92C08J5/18B32B2255/10B32B2255/26B32B2307/7163B32B2307/7244B32B2307/7265B29L2007/002C08J2367/04C08J2491/06C08K2003/3045C08K3/34C08J2369/00C08J2467/04C08J2467/02Y02W90/10
Inventor 姜鑫赵勤
Owner 丹阳恒绿新材料有限公司
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