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Method for recovering waste biaxially oriented polystyrene sheets

A polystyrene sheet, biaxial stretching technology, applied in the direction of plastic recycling, recycling technology, etc., can solve problems such as affecting the appearance quality and physical properties of products, breaking the molecular chain of polymer compounds, and difficult to guarantee the hygienic quality of pellets. , to achieve the effect of not affecting the appearance and physical properties, good production stability, and shortening the production cycle

Inactive Publication Date: 2012-06-27
宁波东升包装材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hygienic quality of the pellets is not easy to guarantee in the granulation process, which affects the hygienic quality of the product, and the molecular chain of the polymer compound after repeated heating and cooling The fracture is severe and the molecular weight decreases, which will affect the appearance quality and physical properties of the product, and eventually lead to a high scrap rate of the product; after granulation, the granules must be cleaned and sieved, otherwise the powder produced during the granulation process will be too much in the granules. As a result, the pellets slipped with the screw at the entrance of the extruder, and could not be extruded. Production must be stopped and cleaned before continuing production, which seriously affected the normal production process, resulting in higher production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A kind of recycling method of waste biaxially stretched polystyrene sheet, it comprises the following steps:

[0011] 1) Put the waste biaxially oriented polystyrene sheet into the pulverizer for crushing. Generally, the waste biaxially oriented polystyrene sheet crushed by the pulverizer is sent to the crushing silo by the feeding blower; 2) Put the waste biaxially oriented polystyrene sheet after pulverization Stretched polystyrene sheet is added into polystyrene particles according to the mass percentage of 20%, put into the silo of the extruder, stir evenly, and then extrude.

Embodiment 2

[0013] 1) Put the waste biaxially oriented polystyrene sheet into a pulverizer for crushing; 2) Add the crushed waste biaxially oriented polystyrene sheet into polystyrene particles at a mass percentage of 25%, and then put it into the silo of the extruder Inside, and stir evenly, squeeze out.

experiment example 3

[0015] A kind of recycling method of waste biaxially stretched polystyrene sheet, it comprises the following steps:

[0016] 1) Put the waste biaxially oriented polystyrene sheet into a pulverizer for crushing; 2) Put the crushed waste biaxially oriented polystyrene sheet into polystyrene particles at a mass percentage of 30%, and then put it into the silo of the extruder Inside, and stir evenly, squeeze out.

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PUM

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Abstract

The invention relates to a method for recovering waste biaxially oriented polystyrene sheets. The method comprises the following steps: 1, crushing the waste biaxially oriented polystyrene sheets in a crusher; and 2, mixing the crushed waste biaxially oriented polystyrene sheets with polystyrene particles having a mass accounting for 20-30% of the sheets, putting the obtained mixture into the bunker of an extruder, uniformly stirring, and extruding. Compared with the prior art, the method of the invention has the characteristics of no influence on the product health quality, less molecular chain cleavage, no influence on the appearance and physical properties, no need of screening, no influence on the extrusion of the extruder, and low production cost.

Description

technical field [0001] The invention relates to a method for recycling waste biaxially stretched polystyrene sheets. Background technique [0002] Biaxially oriented polystyrene (abbreviated as BOPS) sheet is made by extruding a granular material of high heat-resistant crystalline polystyrene (abbreviated as PS) through an extruder, biaxially stretched, surface treated, It is prepared by production processes such as coiling and slitting. Because BOPS sheet has good transparency, gloss and hardness, and it is hygienic and non-toxic, it is very suitable for making food container packaging. At present, it is widely used in food packaging such as sweet bread, biscuit, chocolate, oat cake, candied fruit, fruit, vegetable, meat and butter. And BOPS sheet does not add any plasticizer in the production process, and the waste will not produce harmful gas and pollute the environment after incineration, and can be completely recycled. [0003] The recycling method of the waste biaxi...

Claims

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Application Information

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IPC IPC(8): C08J11/06C08L25/06
CPCY02W30/62
Inventor 俞国芳陈彪虞叶忠黄荣军
Owner 宁波东升包装材料有限公司
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