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A kind of polyethylene film that is easy to be torn in a straight line and its preparation method

A polyethylene film, polyethylene technology, applied in chemical instruments and methods, flexible coverings, lamination, etc., can solve problems such as poor linear tearing

Active Publication Date: 2017-05-03
HUANGSHAN NOVEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary polyethylene film has good chemical resistance and oil resistance, but its linear tear resistance is poor

Method used

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  • A kind of polyethylene film that is easy to be torn in a straight line and its preparation method
  • A kind of polyethylene film that is easy to be torn in a straight line and its preparation method
  • A kind of polyethylene film that is easy to be torn in a straight line and its preparation method

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Effect test

preparation example Construction

[0052] The present invention also provides a kind of preparation method of the polyethylene film described in above-mentioned technical scheme, comprises the following steps:

[0053] The composite layer, the first middle layer, the second middle layer, the third middle layer, the fourth middle layer and the raw materials of the heat-sealing layer are co-extruded to obtain the composite layer, the first middle layer, the second middle layer which are sequentially in contact with each other. layer, the third middle layer, the fourth middle layer and heat-sealed heat-melt pipe;

[0054] The hot-melt pipe is sequentially blown into a film and cooled to shape;

[0055] The composite layer of the film after cooling and setting is subjected to corona treatment to obtain a polyethylene film.

[0056] In the present invention, the types and amounts of the raw materials of the composite layer, the first middle layer, the second middle layer, the third middle layer, the fourth middle l...

Embodiment 1

[0072] Add the raw materials for the composite layer, the raw materials for the first middle layer, the raw materials for the fifth middle layer, the raw materials for the sixth middle layer, the raw materials for the third middle layer, the raw materials for the fourth middle layer, respectively, into the seven barrels of the extruder machine. The raw materials of raw materials and heat-sealing layer, each raw material formula is as follows:

[0073] Composite layer: 75kg grade is the linear low density polyethylene LLDPE of 7042 and 25kg grade is the low density polyethylene LDPE of L420;

[0074] The first intermediate layer: 50kg of low-density polyethylene LDPE of L420 grade and 50kg of high-density polyethylene HDPE of HTA108 grade;

[0075] The fifth middle layer: 100kg of high-density polyethylene HDPE with the grade of HTA108;

[0076] The sixth middle layer: 100kg of high-density polyethylene HDPE with the grade of HTA108;

[0077] The third intermediate layer: the...

Embodiment 2

[0088] Add the raw materials for the composite layer, the raw materials for the first middle layer, the raw materials for the fifth middle layer, the raw materials for the sixth middle layer, the raw materials for the third middle layer, the raw materials for the fourth middle layer, respectively, into the seven barrels of the extruder machine. The raw materials of raw materials and heat-sealing layer, each raw material formula is as follows:

[0089] Composite layer: the 75kg grade is the linear low density polyethylene LLDPE of 7042 and the grade of 25kg Shanghai Petrochemical is the low density polyethylene LDPE of Q281;

[0090] The first intermediate layer: low-density polyethylene LDPE of Q281 produced by Shanghai Petrochemical and 50kg of high-density polyethylene HDPE of HTA108;

[0091] The fifth middle layer: 100kg of high-density polyethylene with the grade of HTA108;

[0092] The sixth middle layer: 100kg of high-density polyethylene with grade HTA108;

[0093] The...

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Abstract

The invention provides a polyethylene film with easy straight-line tearing and a preparation method for the polyethylene film. The film comprises a composite layer, a first intermediate layer, a second intermediate layer, a third intermediate layer, a fourth intermediate layer and a heat-seal layer which are mutually contacted in sequence; the composite layer comprises linear low density polyethylene and low density polyethylene of which the melt index is 2.5 to 4.0g / 10min; the first intermediate layer comprises high density polyethylene and the low density polyethylene of which the melt index is 2.5 to 4.0g / 10min; the second intermediate layer comprises the high density polyethylene; the third intermediate layer comprises the high density polyethylene and the low density polyethylene of which the melt index is 2.5 to 4.0g / 10min; the fourth intermediate layer comprises the linear low density polyethylene and the low density polyethylene of which the melt index is 2.5 to 4.0g / 10min; the heat-seal layer comprises metallocene polyethylene and low density polyethylene of which the melt index is 1.5 to 2.5g / 10min. The polyethylene film has better straight-line tearing performance.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, and in particular relates to a polyethylene film which is easy to be torn in a straight line and a preparation method thereof. Background technique [0002] With the improvement of packaging technology, people are no longer satisfied with the necessary functions of food packaging, such as simply protecting food and prolonging the shelf life of food, but put forward higher and higher requirements for the ease of use of food packaging in actual use. Among them, the easy-tearability of packaging is one of the practical functions that people pay more attention to. Therefore, a new type of easy-tear composite film has emerged in due course and has gradually attracted widespread attention. [0003] An ideal functional composite film aimed at easy tearing needs to have the following characteristics: (1) When consumers open the food packaging bag, there should be a relatively ideal cracking e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/32B32B33/00B32B37/15B32B37/08B32B38/00B65D65/40
CPCB32B27/08B32B27/32B32B33/00B32B37/08B32B37/153B32B38/0008B32B2307/582B65D65/40
Inventor 汪洋汪学文董文辉吴敏
Owner HUANGSHAN NOVEL
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