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Blow-molding method for sun shield sheet machine

A blow molding and sheet machine technology, applied in the field of blow molding, can solve the problems of increasing the molding cycle of plastic parts and wasting time, and achieve the effects of shortening the molding cycle, saving material and manpower, and saving production costs

Inactive Publication Date: 2019-12-06
SHANGHAI LONGDA PLASTIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, with the development of the times, the technology should also be improved accordingly. The above technology not only wastes time, but also greatly increases the molding cycle of plastic parts.

Method used

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  • Blow-molding method for sun shield sheet machine
  • Blow-molding method for sun shield sheet machine
  • Blow-molding method for sun shield sheet machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] see Figure 1~3 , in an embodiment of the present invention, a sun visor sheet machine blow molding method, comprising the following steps:

[0026] S1, the plastic (polyethylene) is melted and plasticized through the extruder 100, and the screw of the extruder 100 drives the melted plastic to move to the head position of the extruder 100;

[0027] S2, the head of the extruder extrudes two sheets of parison 500 through the die 200 into the mold (composed of the left mold 300 and the right mold 400), and after the parison 500 is in place, fix the insert 600 on the mold In the appropriate position within the mold, start mold closing, and the mold closing time is 0.7 to 0.8 seconds; Air blowing, the pre-blowing air pressure is 0.7-0.8MPa, the pre-blowing time is 8-12 seconds, and the mold clamping starts after the pre-blowing is completed;

[0028] S3, after the mold clamping is in place, the sheet-shaped parison 500 is wrapped on the outside of the insert 600, and the t...

Embodiment 2

[0032] see Figure 1~3 , in an embodiment of the present invention, a sun visor sheet machine blow molding method, comprising the following steps:

[0033] S1, the plastic (polyethylene) is melted and plasticized by the extruder 100, and the screw of the extruder 100 drives the molten plastic to move to the position of the head of the extruder 100. Here, the material of the extruder 100 The barrel has several heating sections. In this embodiment, the number of heating sections is two. Along the discharge direction of the extruder, the heating temperature of the first heating section is 165°C to 170°C, and the heating temperature of the second heating section is The heating temperature of the section is 175°C to 180°C, which can avoid defects such as poor plasticization of polyethylene, poor parison expansion and stretching, and poor surface gloss of the product caused by low extrusion temperature;

[0034] In addition, in order to monitor the temperature, several temperature ...

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Abstract

The invention discloses a blow-molding method for a sun shield sheet machine and relates to the technical field of blow-molding. The blow-molding method comprises the following steps: S1, melting andplastifying a plastic by means of an extruder, and driving the melted plastic by a screw of the extruder to a position of a head of the extruder; S2, extruding two sheet parisons by a neck mould by means of the head of the extruder to be fed into a mold, and after the parisons are in position, fixing an insert in a proper position of the mold and starting die assembling; S3, after assembling the die in position, wrapping the insert by the sheet parisons and blowing the two sheet parisons at the same time, and keeping the pressure and cooling; and S4, after opening the mold, taking out a piece.The blow-molding method has the beneficial effects that the parisons are extruded by the neck mould and the parisons and the insert are blow-molded primarily in the mold, so that the forming period is shortened greatly, a lot of manpower and material resources are saved, the forming efficiency is high, and the production cost can be saved effectively.

Description

technical field [0001] The invention relates to the technical field of blow molding, in particular to a blow molding method of a sun visor sheet machine. Background technique [0002] Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. Plastics suitable for blow molding include polyethylene, polyvinyl chloride, polypropylene, polyester, etc., and the resulting hollow containers are widely used as industrial packaging containers. In recent years, with the continuous development of extrusion blow molding, the technology has reached a bottleneck period. [0003] In the prior art, the round billet is usually extruded through the extruder, then the mold is closed, the mold is closed and the air is blown, and then the pressure is maintained, cooled, the mold is opened, and the plastic part is taken out. After the plastic part is formed, the required insert Parts and plastic parts are combined again through related processes to beco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C49/04B29C49/78B29C48/80
CPCB29C49/04B29C49/78B29C48/832B29C49/06916B29C49/0691
Inventor 张银龙
Owner SHANGHAI LONGDA PLASTIC TECH
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