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Device and process for compression moulding plastics articles

A technology of molding plastics and products, applied in the direction of threaded products, applications, household appliances, etc., which can solve the problems of bending, reliable production of pipes, orifice rod breakage, etc.

Active Publication Date: 2011-10-26
AISAPACK HLDG SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phenomenon can prevent the formation of the orifice on the molded object (typically when the rod is fully withdrawn into the sleeve)
May also result in uneven or insufficient dosing of material on the sleeve
[0010] In the particular case of pipes having a small diameter orifice, less than 1.5 mm and for example 0.8 mm, the devices disclosed in patents US4,943,405 and US4,352,775 do not allow the production of these pipes in a reliable manner
More specifically, in this configuration, the protruding length and small diameter of the orifice stem causes it to bend and potentially break when the mandrel rests against its top surface
Orifice rods may often break causing repeated interruptions in production, and rod fragments can easily damage other parts of the mold during mold closing

Method used

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  • Device and process for compression moulding plastics articles
  • Device and process for compression moulding plastics articles
  • Device and process for compression moulding plastics articles

Examples

Experimental program
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Embodiment Construction

[0028] figure 1 Shows the lower half of the die, known as the die assembly, in a rest position, which includes a shoulder die 6 for forming the outer part of the pipe head, a thread forming die 7 with multiple parts to make the threaded part The mold is demoulded and the sleeve 8 is able to move linearly along the axis A in the axis of symmetry of the device. The sleeve 8 includes a first shoulder 8 a limiting its path between the two stops 9 and 10 .

[0029] The die assembly also includes an orifice bar 11 for forming the orifice of the shoulder. The orifice rod 11 includes a shoulder 24 in its lower part and can slide in the sleeve 8 . The path of the orifice rod 11 is limited in the upper position by the shoulder 24 and a stop 12 provided on the sleeve. The path of the orifice rod 11 is also limited in the lower position by a pin 13, for example cylindrical, and by a stop 14 provided on the sleeve 8, which is extended by one of said sleeves 8 The bottom wall of the hol...

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PUM

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Abstract

The invention concerns a device for molding a plastic material article whereby the article is obtained by compressing a dose of molten plastic material (3) between two parts of a mold, comprising at least one plastic material supply (1), a rod (11) sliding in a dowel bush (8) for temporarily supporting said dose of plastic material (3), an article head mold (6, 7), a mandrel (18) co-operating with said mold (6, 7). The invention is characterized in that it comprises non-elastic retaining means (12-14,23,24) for limiting the two-way movement of the rod (11) in the dowel bush (8). The inventionalso concerns a method using said device.

Description

technical field [0001] The present invention relates to a system and method for compression molding plastic articles, wherein the part is obtained by compressing a portion of plastic material in molten state between two parts of a mould. [0002] The invention is particularly suitable for the production of plastic tubes, eg for toothpaste or cosmetics, consisting of a flexible cylindrical body connected to a head comprising a shoulder and an orifice. In this particular case, the head of the tube is formed and welded to the body at the same time. The head of the tube is made from a mass of molten material that is molded and compressed between a lower die, called a die assembly, and an upper die, called a mandrel, into which the flexible cylindrical body fits superior. The temperature of the material causes it to fuse to the body of the tube. In a machine for the production of pipes, several molds are usually moved by intermittent (or continuous) movement, each mold being sub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C31/04B29C43/34
CPCB29C31/048B29C33/0033B29C43/34B29C2043/3283B29C2043/3433B29L2001/00
Inventor D·阿诺
Owner AISAPACK HLDG SA
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