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A kind of recycling method of multi-layer functional co-extrusion film

A co-extruded film and functional technology, which is applied in the recycling field of multi-layer functional co-extrusion films, can solve the problem of difficult sorting and recycling, difficulty in delamination of multi-layer functional co-extrusion films, and inability to use multi-layer co-extrusion blow molding again. and other problems, to achieve the effect of reducing the difficulty of recycling and broadening the scope of recycling.

Active Publication Date: 2021-04-02
SUNRISE PACKAGING MATERIAL JIANGYIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing multi-layer functional co-extrusion films are usually composed of base layers such as PE and PP and functional layers such as PA or EVOH. These materials themselves do not belong to the same category, and these multi-layer functional co-extrusion films are difficult to delaminate. It is difficult to achieve classified recycling, so the recycling of multi-layer functional co-extrusion film can only be used in technical fields with lower performance requirements such as injection molding after granulation and drying, but it cannot be used again in the technical field of multi-layer co-extrusion blow molding

Method used

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  • A kind of recycling method of multi-layer functional co-extrusion film
  • A kind of recycling method of multi-layer functional co-extrusion film
  • A kind of recycling method of multi-layer functional co-extrusion film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of recovery method of multi-layer functional co-extrusion film, comprises the following steps:

[0021] Waste selection: choose multi-layer functional co-extruded film waste with PA content of 15%, EVOH content of 7.5%, and PE and PP content of 77.5%;

[0022] Recycling granulation: heat-melt the above-mentioned waste materials at a temperature of 250°C, and use a single-screw granulator (the temperature in each zone is 150°C, 200°C, 220°C, 250°C, 250°C) to granulate to obtain recycled materials particle;

[0023] Particle drying: The obtained recycled particles are dried by air-cooling drying method to obtain multi-layer functional co-extruded film recycled materials.

Embodiment 2

[0025] A kind of preparation method of the film that contains multi-layer functional co-extruded film return material, comprises the following steps (below are all parts by weight):

[0026] Material mixing: According to the ratio in Table 1, take the recovered dried multi-layer functional co-extrusion film return material, solubilizer (specifically choose maleic anhydride grafted polyethylene PE-g-MAH), desiccant (specifically choose PE95%, calcium oxide (CaO5%) are fully mixed in the barrel;

[0027] Extrusion blow molding into film bubbles: the blown film thickness of the recycled material is 100 μm, the inflation ratio is 2.0, low-density polyethylene (LDPE) is selected, and the polyethylene purchased from Qatar Petrochemical Co., Ltd. is FD0270.

[0028] Use more than three layers of co-extrusion device to extrude multi-layer functional co-extruded film, add LDPE, recycled materials, and LDPE into the hopper of the extruder according to the ratio of parts by weight in Tab...

Embodiment 3

[0032] The preparation method is the same as in Example 2, and the film structure, layer thickness and distribution ratio (parts by weight) of each component are as shown in Table 2:

[0033] Table 2

[0034]

[0035]

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Abstract

The invention discloses a method for recovering a multi-layer functional co-extruded film. The method comprises the following steps that a plurality of layers of functional co-extruded film waste aresubjected to hot melting under the temperature of 220 DEG C to 280 DEG C, a single screw granulator is used for granulation for obtaining return particles, the fed-back particles are dried through anair-cooling drying manner, and return materials of the multi-layer functional coextruded film are obtained. The invention also discloses a preparation method of the film containing the multi-layer functional co-extruded film return materials. The method for recovering the multi-layer functional co-extruded film can reduce the recovering difficulty of the multi-layer functional co-extruded film, broadens the recycling scope, and makes the recycled product be used in the technical field of blown films.

Description

technical field [0001] The invention belongs to the technical field of recycling packaging materials, and in particular relates to a recycling method for a multilayer functional co-extrusion film. Background technique [0002] Generally, single-component PE film or CPP film can be reused on-line through simple crushing, or off-line crushing, granulation, drying and then blow molding for reuse. Most of the existing multi-layer functional co-extrusion films are usually composed of base layers such as PE and PP and functional layers such as PA or EVOH. These materials themselves do not belong to the same category, and these multi-layer functional co-extrusion films are difficult to delaminate. It is difficult to achieve classified recycling, so the recycling of multi-layer functional co-extrusion film can only be used in technical fields with lower performance requirements such as injection molding after granulation and drying, but it cannot be used again in the technical field...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B9/06B29B13/06B29C55/28C08L23/06C08L23/12C08L77/00C08L23/08C08L51/06C08K3/22C08K3/34B29L7/00
Inventor 焦逸清
Owner SUNRISE PACKAGING MATERIAL JIANGYIN CO LTD