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Polypropylene film preparing method

A polypropylene film and extruder technology, used in the field of polypropylene film preparation, can solve the problems of poor tensile strength, uneven thickness, rough surface, etc., and achieve good tensile strength, good transparency, and uniform thickness. Effect

Inactive Publication Date: 2019-07-02
无锡市融发包装材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing polypropylene film preparation method is unreasonable, resulting in poor transparency, uneven thickness, rough surface and poor tensile strength of the prepared film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of polypropylene film, comprises the following steps:

[0024] S1, batching, stir the plastic particles evenly to obtain the mixture;

[0025] S2, extruding, adding the compound into the hopper of the extruder, extruding the molten plastic from three extruders;

[0026] The screw of the extruder is a gradual change type, the diameter of the screw is 45mm, the length-to-diameter ratio of the screw is 20, the compression ratio is 3.8, the thread groove depth of the homogenization section is 1.75mm, the rotating speed of the screw is 70rpm, and the barrel temperature of the extruder is 190°C, the extrusion end of the extruder is equipped with 80 mesh, 100 mesh, and 80 mesh filters;

[0027] S3, film blowing, the molten plastic enters the film blowing head through the connector, the film is blown by the film blowing head, the blown film is pulled by the traction roller, the temperature of the connector is 240°C, and the temperature of the film blowin...

Embodiment 2

[0029] The preparation method of polypropylene film, comprises the following steps:

[0030] S1, batching, stir the plastic particles evenly to obtain the mixture;

[0031] S2, extruding, adding the compound into the hopper of the extruder, extruding the molten plastic from three extruders;

[0032] The screw of the extruder is a gradual change type, the diameter of the screw is 45mm, the length-to-diameter ratio of the screw is 20, the compression ratio is 3.8, the thread groove depth of the homogenization section is 1.75mm, the rotating speed of the screw is 80rpm, and the barrel temperature of the extruder is 225°C, the extrusion end of the extruder is equipped with 80-mesh, 100-mesh, and 80-mesh filters;

[0033] S3, film blowing, the molten plastic enters the film blowing head through the connector, the film is blown by the film blowing head, the blown film is pulled by the traction roller, the temperature of the connector is 245°C, and the temperature of the film blowin...

Embodiment 3

[0035] The preparation method of polypropylene film, comprises the following steps:

[0036] S1, batching, stir the plastic particles evenly to obtain the mixture;

[0037] S2, extruding, adding the compound into the hopper of the extruder, extruding the molten plastic from three extruders;

[0038] The screw of the extruder is a gradual change type, the diameter of the screw is 45mm, the length-to-diameter ratio of the screw is 20, the compression ratio is 3.8, the thread groove depth of the homogenization section is 1.75mm, the rotating speed of the screw is 90rpm, and the barrel temperature of the extruder is 250°C, the extrusion end of the extruder is equipped with 80-mesh, 100-mesh, and 80-mesh filters;

[0039] S3, film blowing, the molten plastic enters the film blowing head through the connector, the film is blown by the film blowing head, the blown film is pulled by the traction roller, the temperature of the connector is 250°C, and the temperature of the film blowin...

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PUM

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Abstract

The invention relates to a film preparing film, in particular to a polypropylene film preparing method. The polypropylene film preparing method comprises the following steps that firstly, burdening isconducted, plastic particles and powder are evenly stirred, and mixture is obtained; secondly, extrusion is conducted, the mixture is added in hoppers of extruders, and the three extruders are used for extruding melted plastics; and thirdly, film blowing is conducted, the melted plastics enter a film blowing machine head through a connector, the film blowing machine head conducts film blowing, and a blown-out film is dragged through a dragging roller. The polypropylene film prepared through the provided polypropylene film preparing method is good in transparency, uniform in thickness, flat insurface and good in stretching strength.

Description

technical field [0001] The invention relates to a method for preparing a film, especially a method for preparing a polypropylene film. Background technique [0002] Polypropylene has many excellent properties, such as its low density and high mechanical strength. In particular, polypropylene is a typical crystalline high polymer, and the cooling rate has a great influence on the transparency of the film. The cooling speed is fast, the crystallinity is low, the film transparency is high, the impact resistance and toughness are good, and the film feels good. Polypropylene film products have many excellent properties, such as low relative density and high mechanical strength, especially due to rapid cooling, the film has high transparency and high heat resistance, which makes polypropylene film widely used. It can be used for the packaging of clothing, food and various products, especially when combined with other materials to make a retort bag, which can be cooked at 100°C w...

Claims

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Application Information

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IPC IPC(8): B29C55/28B29K23/00
CPCB29C55/28B29K2023/12B29C48/10B29C48/0018
Inventor 徐纬
Owner 无锡市融发包装材料有限公司