Stretching wrapping film and preparation method thereof

A technology for stretching and wrapping films and raw materials, applied in chemical instruments and methods, sustainable manufacturing/processing, flexible coverings, etc., can solve problems such as high environmental pollution and refractory film degradation

Active Publication Date: 2021-04-20
NINGBO HONGYAN PACKING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the Chinese invention patent application CN109181195A (an ultra-thin film and its production method), maleic anhydride grafted low-density polyethylene is used as the base material, and metallocene, PIB (polyisobutylene) and graphene oxide, and polyisobutylene are added. Pentadiene and polyurethane, on the one hand, reduce the production cost of the film, on the other hand, improve the machinability and viscosity of the film, and at the same time increase the temperature adaptation range of the film, and promote the self-adhesion of the film, etc. The final film thickness is 5-10μm; but the mechanical strength of this film has decreased, and at the same time, the stretch film is added with a variety of polymer materials, so the film is more difficult to degrade, so the degree of environmental pollution is higher

Method used

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  • Stretching wrapping film and preparation method thereof
  • Stretching wrapping film and preparation method thereof
  • Stretching wrapping film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of stretch wrapping film, is made up of 7 layers of materials, carries out the preparation of stretch wrapping film according to following steps:

[0040] (1) Melt blending of raw materials: Weigh the raw materials according to the ratio of the raw materials of each layer in Table 1, and add the raw materials of each layer into the corresponding screw extruder for melt blending to obtain a uniform melt; then the raw materials The melt is extruded into the distributor through the screw, and the distributor distributes the melt according to the mass ratio of each layer;

[0041]The length ratio among the feed section, compression section and homogenization section in the screw extruder is 1:1.22:1.11. Specifically: for a traditional screw extruder, the length of the feeding section, the compression section and the homogenization section are the same. In this embodiment, the compression section is lengthened by 10%, and the feeding section is correspondingly reduced...

Embodiment 2

[0049] According to the proportioning of each layer of raw materials in Table 1, the raw materials are weighed, similar to the preparation method of Example 1, the difference from Example 1 in the specific preparation steps is:

[0050] (1) The mass ratio of the raw material melts from the first layer to the seventh layer distributed by the distributor is 1:1.2:0.5:0.4:0.3:1:1.2;

[0051] (2) The length ratio between the feeding section, compression section and homogenization section in the screw extruder is 1:1.22:1.11;

[0052] (3) The temperature of the extrusion die of the screw extruder is 230°C, and the extrusion pressure is 15MPa;

[0053] (4) The speed ratio of forming roll, cooling roll, traction roll and winding roll is 1: 1.006: 1.011: 0.998.

Embodiment 3

[0055] According to the proportioning of each layer of raw materials in Table 1, the raw materials are weighed, similar to the preparation method of Example 1, the difference from Example 1 in the specific preparation steps is:

[0056] (1) The mass ratio of the raw material melts from the first layer to the seventh layer distributed by the distributor is 1:0.8:0.9:0.6:0.7:1:1.7;

[0057] (2) The length ratio between the feeding section, compression section and homogenization section in the screw extruder is 1:1.15:1.08;

[0058] (3) The temperature of the extrusion die of the screw extruder is 280°C, and the extrusion pressure is 8MPa;

[0059] (4) The speed ratio of forming roll, cooling roll, traction roll and winding roll is 1: 1.053: 1.125: 0.925.

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Abstract

The invention discloses a stretching wrapping film and a preparation method thereof, and belongs to the technical field of wrapping film production. The stretch wrapping film is composed of seven layers of materials, the first layer and the sixth layer are made of the same materials, the third layer and the fifth layer are made of the same materials, polyethylene serves as a base body of each layer of materials, the second layer is made of customized metallocene polyethylene, and meanwhile an ethylene-propylene elastomer is added into the seventh layer of materials, so that the wrapping film has higher tensile property. In addition, carbon nanotubes pretreated by a silane coupling agent can also be added into each layer, so that the anisotropy of the wrapping film is improved; an improved screw extruder is adopted in the preparation process, the length ratio of a feeding section to a compression section to a homogenizing section is changed, meanwhile, process parameters during screw extrusion and traction winding are optimized, and the finally obtained stretching wrapping film is thinner in size and more uniform in performance.

Description

technical field [0001] The invention belongs to the technical field of stretch film production, and in particular relates to a stretch stretch film and a preparation method thereof. Background technique [0002] Polyethylene stretch film is a kind of stretch film commonly used in current industrial production. It can be widely used in industrial packaging, and polyethylene film is difficult to degrade. There are millions of tons of polyethylene stretch film produced in the market every year. These large quantities High-quality polyethylene stretch film will have a great impact on the environment. By upgrading the quality and variety of polyethylene stretching film and reducing the amount of polyethylene stretching film used, users can use a smaller amount of stretching film to achieve the same use requirements, so it will reduce environmental pollution to a certain extent, and also It will reduce the user's cost of use. [0003] At present, the polyethylene stretch film in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B27/06B32B27/20B32B33/00C08L23/06C08L23/16C08J5/18C08L23/08C08K9/06C08K3/04C08L67/02C08L67/04C08L3/02B65D65/40
CPCY02W90/10
Inventor 李玉斌李辉王勋
Owner NINGBO HONGYAN PACKING MATERIAL
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