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Polyethylene composite film capable of 100% recovery as well as preparation method and application thereof

A polyethylene and composite film technology, applied in the field of polyethylene materials, can solve problems such as difficulty in meeting process requirements, poor temperature resistance, failure to meet the temperature resistance requirements of zipper bags and nozzle bags, etc., and achieve excellent composite fastness, Difficult to delaminate, excellent hot-tack and heat-sealing strength effects

Active Publication Date: 2020-08-14
江门市华龙膜材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For ordinary PE film or ordinary composite PE film (such as PE / PE), due to the poor temperature resistance of ordinary PE film, the film is soft and easy to stretch, it is difficult to meet the process requirements of high-speed printing, lamination, bag making and automatic filling , and cannot meet the temperature resistance requirements of zipper bags and nozzle bags

Method used

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  • Polyethylene composite film capable of 100% recovery as well as preparation method and application thereof
  • Polyethylene composite film capable of 100% recovery as well as preparation method and application thereof
  • Polyethylene composite film capable of 100% recovery as well as preparation method and application thereof

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preparation example Construction

[0055] The present invention also provides a preparation method of the 100% recyclable polyethylene composite film described in the above technical solution, when the adhesive layer is a low-density polyethylene film, the method comprises the following steps:

[0056] After melting and plasticizing the raw materials of the outer layer of the printing layer, the middle layer of the printing layer and the inner layer of the printing layer, the three-layer blown film co-extrusion process is used to co-extrude the blown film to obtain the primary printing layer;

[0057] The primary printing layer is sequentially subjected to longitudinal uniaxial stretching, annealing and corona treatment to obtain a composite printing layer;

[0058] Melting and plasticizing the raw materials of the outer layer of the heat-sealing layer, the middle layer of the heat-sealing layer and the inner layer of the heat-sealing layer, and then co-extruding the blown film using a three-layer blown film co-...

Embodiment 1

[0088] In the 100% recyclable polyethylene composite film prepared in this example, the adhesive layer is a solvent-free glue layer, the thickness is negligible, the thickness of the printing layer is 20 μm, and the heat-sealing layer is 20 μm;

[0089] In the printing layer, the mass ratio of the outer layer of the printing layer, the middle layer of the printing layer and the inner layer of the printing layer is 3:4:3; in terms of mass percentage, the outer layer of the printing layer includes 45% of metallocene medium density polyethylene 3505MC and 55% of High-density polyethylene HTA108; in terms of mass percentage, the middle layer of the printing layer includes 25% of bimodal medium-density polyethylene FB1350 and 75% of metallocene low-density polyethylene 6056ML; in terms of mass percentage, the inner layer of the printing layer includes 35% of Metallocene medium density polyethylene 4002ML and 65% high density polyethylene 5960G;

[0090] In the heat-sealing layer, t...

Embodiment 2

[0102] In the 100% recyclable polyethylene composite film prepared in this example, the adhesive layer is a solvent-free glue layer, the thickness is negligible, the thickness of the printing layer is 30 μm, and the heat-sealing layer is 20 μm;

[0103] In the printing layer, the mass ratio of the outer layer of the printing layer, the middle layer of the printing layer and the inner layer of the printing layer is 1:2:1; in terms of mass percentage, the outer layer of the printing layer includes 45% of metallocene medium density polyethylene 3505MC and 55% of High-density polyethylene HTA108; in terms of mass percentage, the middle layer of the printing layer includes 25% of bimodal medium-density polyethylene FB1350 and 75% of metallocene low-density polyethylene 6056ML; in terms of mass percentage, the inner layer of the printing layer includes 35% of Metallocene medium density polyethylene 4002ML and 65% high density polyethylene 5960G;

[0104] In the heat-sealing layer, t...

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Abstract

The invention belongs to the technical field of polyethylene materials, and particularly relates to a polyethylene composite film capable of 100% recovery as well as a preparation method and application thereof. The provided polyethylene composite film comprises a composite printing layer, a bonding layer and a composite heat-seal layer which are bonded in sequence, wherein the composite printinglayer is a longitudinally-stretched polyethylene printing film; the direction from the composite printing layer to the composite heat sealing layer is from outside to inside, and the composite printing layer comprises a printing layer outer layer, a printing layer middle layer and a printing layer inner layer in sequence; the bonding layer is a low-density polyethylene film or a solvent-free gluelayer; the composite heat-seal layer is a multi-layer co-extrusion polyethylene heat-seal film and comprises a heat-seal layer outer layer, a heat-seal layer middle layer and a heat-seal layer inner layer in sequence. Experimental results show that the polyethylene composite film capable of 100% recovery can be recycled by 100%, and has the characteristics of small thickness, low density, punctureresistance and low unsealing temperature.

Description

technical field [0001] The invention belongs to the technical field of polyethylene materials, and in particular relates to a 100% recyclable polyethylene composite film and its preparation method and application. Background technique [0002] In food, lotion, cosmetics and other industries, compared with waste paper and waste metal, waste plastics are relatively complicated to recycle due to their complex composition and different forms, especially food packaging for printing, fragrance preservation, pressure resistance, and anti-break Bags, moisture-proof, improved shelf life and other requirements, the structure of each bag is 2 to 4 layers of materials with different components, such as PET / PE, BOPP / PE, PET / VMPET / PE, NY / PE, PET / AL / NY / PE, after use, it cannot be stripped, recycled or reused at all, and can only be incinerated or landfilled, causing great pollution to the environment. [0003] At present, biaxially stretched BOPE composite PE can be recycled after use, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/32B32B7/02B32B7/12B32B33/00B65D65/40B29D7/01
CPCB29D7/01B32B7/02B32B7/12B32B27/08B32B27/32B32B33/00B32B2307/306B32B2307/54B32B2307/558B32B2307/7265B65D65/40Y02W30/80
Inventor 文斌森魏洪媚
Owner 江门市华龙膜材股份有限公司
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