High-transparency polyethylene film and preparation method thereof

A polyethylene film, transparent technology, applied in the field of plastic processing, can solve the problems of good transparency and high heat sealability and physical strength, etc., to achieve the effect of improving transparency, maintaining printing effect, and increasing smoothness

Inactive Publication Date: 2015-11-04
ZHEJIANG GOLDSTONE PACKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] What the present invention solves is that the polyethylene film in the prior art cannot solve the contradiction between good transparency and high heat-sealability and physical strength, and then provides a film with high heat-sealability, barrier property, transparency and physical strength at the same time. Strong polyethylene film and method for its preparation

Method used

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  • High-transparency polyethylene film and preparation method thereof
  • High-transparency polyethylene film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The high transparent polyethylene film described in this embodiment is composed of three layers of co-extruded film, wherein the outer layer is composed of 35 parts by weight of SP2520 with a melt index of 2g / 10min and 65 parts by weight of 2420H with a melt index of 2g / 10min ; The middle layer is compounded by 70 parts by weight of 920A with a melt index of 1g / 10min and 30 parts by weight of 2426H with a melt index of 2g / 10min; the inner layer is composed of 35 parts by weight of SP2520 and a melt index of 2g / 10min 65 parts by weight of 2426H with a melt index of 2 g / 10 min; the thickness ratio of the outer layer to the middle layer and inner layer is 1:4:1.

[0025] In this embodiment, the raw materials of each layer are added to the extruders of each layer to melt, plasticize and extrude, and the film is blown under the conditions of the inflation ratio of 2.5 and the traction ratio of 6, and then cooled by the cooling air ring. A highly transparent polyethylene film...

Embodiment 2

[0027] The highly transparent polyethylene film described in this example is composed of three layers of co-extruded film, wherein the outer layer is composed of 20 parts by weight of SP2520 with a melt index of 2g / 10min and 80 parts by weight of 2420H with a melt index of 2g / 10min The middle layer is compounded by 80 parts by weight of 920A with a melt index of 1g / 10min and 20 parts by weight of 2426H with a melt index of 2g / 10min; the inner layer is composed of 50 parts by weight of SP2520 and a melt index of 2g / 10min 50 parts by weight of 2426H with a melt index of 2 g / 10 min; the thickness ratio of the outer layer to the middle layer and inner layer is 1:3:1.

[0028] In this embodiment, the raw materials of each layer are added to the extruders of each layer to melt, plasticize and extrude, and the film is blown under the conditions of the inflation ratio of 2 and the traction ratio of 7, and then cooled by the cooling air ring. A highly transparent polyethylene film with...

Embodiment 3

[0030] The highly transparent polyethylene film described in this example is composed of three layers of co-extruded film, wherein the outer layer is composed of 50 parts by weight of SP2520 with a melt index of 2g / 10min and 50 parts by weight of 2420H with a melt index of 2g / 10min The middle layer is compounded by 60 parts by weight of 920A with a melt index of 1g / 10min and 40 parts by weight of 2426H with a melt index of 2g / 10min; the inner layer is composed of 20 parts by weight of SP2520 and a melt index of 2g / 10min 80 parts by weight of 2426H with a melt index of 2 g / 10min; the thickness ratio of the outer layer to the middle layer and inner layer is 1:3.5:1.

[0031] In this embodiment, the raw materials of each layer are added to the extruders of each layer to melt, plasticize and extrude, and the film is blown under the conditions of the inflation ratio of 2.8 and the traction ratio of 5, and then cooled by the cooling air ring. A highly transparent polyethylene film wit...

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Abstract

The invention provides a high-transparency polyethylene film and a preparation method thereof. The film comprises three layers of co-extrusion membranes, and the inner layer and the outer layer of the film are each formed by compounding MLLDPE with 2 g/10min of melt index and LDPE with 2 g/10min of melt index according to the mass ratio of (20-50): (50-80), thereby the high transparency and low temperature heat sealability of the film are guaranteed; the intermediate layer of the film is formed by HDPE with 1 g/10min of melt index and LDPE with 2 g/10min of melt index according to the mass ratio of (60-80): (20-40), the combination between the outer layer and the inner layer is effectively ensured, and it is facilitated to improve the transparency and physical strength of the film. According to the preparation method of the film, film blowing is conducted under the condition of specific blowup ratio and traction ratio, the film is subjected to stretching to a larger extent, and on the premise of guaranteeing the good transparency and physical strength of the film, it is facilitated to improve the heat sealability of the film.

Description

technical field [0001] The invention relates to a highly transparent polyethylene film and a preparation method thereof, belonging to the technical field of plastic processing. Background technique [0002] Polyethylene is a thermoplastic resin obtained by polymerization of ethylene. In industry, it also includes copolymers of ethylene and a small amount of α-olefins. Polyethylene material has been widely used due to its many advantages such as odorless and non-toxic, low temperature resistance, corrosion resistance, excellent electrical insulation, good chemical stability, and not easy to dissolve. At present, polyethylene material is mainly used to manufacture films and containers. , pipes, monofilaments, wires and cables, daily necessities, etc., can also be used as high-frequency insulation materials for TVs, radars, etc., making polyethylene usage account for 70% of the world's consumption of polyolefin resins, accounting for 44% of the consumption of thermoplastic gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/32B32B33/00B32B37/16B32B37/08B32B37/06B65D65/40
CPCB32B27/08B32B27/32B32B33/00B32B37/06B32B37/08B32B37/16B32B2307/31B32B2307/412B32B2307/536B32B2307/54B65D65/40
Inventor 张文锋孙国锦郭伟
Owner ZHEJIANG GOLDSTONE PACKING
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