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Production method of physical foaming extruded product and formula of product

An extrusion product and physical foaming technology, applied in the field of foam extrusion, can solve the problems of low density, odor, odor stimulation, etc., and achieve the effect of good toughness, wide application range and strong barrier property

Inactive Publication Date: 2018-02-23
阮伟炽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, butane foam was used for foaming, which has odor, is not environmentally friendly, is flammable, has too large bubbles, and has too low density; in addition, there is chemical foaming, adding plasticizers, which does not meet safety standards, using AC foaming agent, and foaming Insufficient foaming, containing azoamide, irritating odor, filled with talcum powder, not resistant to aging; not suitable for use in food and pharmaceutical industries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of production method of physical foaming extruded product, comprises the steps:

[0021] S1. Putting in raw materials: Add raw materials into the extruder to ensure that the raw materials are clean, and keep the raw materials dry to avoid doping with water;

[0022] S2, heating and dissolving: the temperature of the extruder is controlled at about 170 degrees, and the temperature is maintained for more than 120 minutes, so that the raw materials are in a molten state;

[0023] S3. Gas injection: when the raw material is completely melted, gas is introduced, the gas is one of nitrogen, air or carbon dioxide, and the gas injection volume is 10-15% of the raw material;

[0024] S4. Forming extrusion: start the extruder, the screw conveys the raw material to the die, and extrude under high pressure to form a sheet, and the pressure of the extruder is 10-30MPa;

[0025] S5. Calendering: Calender the formed sheet products through three-roller calendering equipment. Th...

Embodiment 2

[0031] A kind of production method of physical foaming extruded product, comprises the steps:

[0032] S1. Putting in raw materials: Add raw materials into the extruder to ensure that the raw materials are clean, and keep the raw materials dry to avoid doping with water;

[0033] S2, heating and dissolving: the temperature of the extruder is controlled at about 170 degrees, and the temperature is maintained for more than 120 minutes, so that the raw materials are in a molten state;

[0034] S3. Gas injection: when the raw material is completely melted, gas is injected, the gas is one of nitrogen, air or carbon dioxide, and the gas injection flow rate is 0.5㎥ / h~1.5㎥ / h;

[0035] S4. Forming extrusion: start the extruder, the screw conveys the raw material to the die, and extrude under high pressure to form a sheet, and the pressure of the extruder is 10-30MPa;

[0036] S5. Calendering: Calender the formed sheet products through three-roller calendering equipment. The three-roll...

Embodiment 3

[0042] A kind of production method of physical foaming extruded product, comprises the steps:

[0043] S1. Putting in raw materials: Add raw materials into the extruder to ensure that the raw materials are clean, and keep the raw materials dry to avoid doping with water;

[0044] S2, heating and dissolving: the temperature of the extruder is controlled at about 170 degrees, and the temperature is maintained for more than 120 minutes, so that the raw materials are in a molten state;

[0045] S3. Gas injection: when the raw material is completely melted, gas is injected, the gas is one of nitrogen, air or carbon dioxide, and the gas injection flow rate is 0.5㎥ / h~1.5㎥ / h;

[0046] S4. Forming extrusion: start the extruder, the screw conveys the raw material to the die, and extrude under high pressure to form a sheet, and the pressure of the extruder is 10-30MPa;

[0047] S5. Calendering: Calender the formed sheet products through three-roll calendering equipment. The traction spe...

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Abstract

The invention discloses a production method of a physical foaming extruded product and a formula of the product. The production method comprises the following steps: S1, raw material feeding; S2, heating dissolving; S3, gas injection; S4, extrusion molding; S5, calendaring; and S6, winding. The formula of the product is prepared from 99.5 parts of an LDPE (low-density polyethylene) material, 0.1 part of demolding wax and 0.4 part of a stabilizer. Compared with a conventional foaming product, the physical foaming extruded product has the advantages that the LDPE material is used as a main raw material, so that the product is nontoxic and odorless, accords with the food and drug health level, and also has the characteristics of high barrier property, high toughness, heat resistance, aging resistance and the like; and the product is noncombustible, can be applied to the field of medical instrument, drug and food packaging materials, and is wide in application range.

Description

technical field [0001] The invention belongs to the field of foam extrusion molding, and more specifically relates to a production method of physical foam extrusion products. Simultaneously, the invention also relates to a formula of a physically foamed extruded product. Background technique [0002] Extrusion foaming is a process of producing foamed materials by using an extruder. The foaming agent and resin are mixed and added to the extruder. The material of the foam core layer is extruded through an extruder after foaming, and the material is extruded through a die to form a shape. [0003] In the past, butane foam was used for foaming, which has odor, is not environmentally friendly, is flammable, has too large bubbles, and has too low density; in addition, there is chemical foaming, adding plasticizers, which does not meet safety standards, using AC foaming agent, and foaming Insufficient soaking, containing azoamide, irritating odor, filled with talcum powder, not r...

Claims

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Application Information

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IPC IPC(8): B29C69/02B29C47/00B29C44/20B29C43/24B29L7/00B29K23/00
CPCB29C43/24B29C44/20B29C48/0011B29C48/0012B29K2023/0633B29L2007/002
Inventor 阮伟炽
Owner 阮伟炽