CN100439075C

CN100439075C - Improved process for forming plastic clothes rack

Info

Publication number: CN100439075C
Application number: CNB2006100529398A
Authority: CN
Inventors: 章辉敏; 卢志勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-08-15
Filing date: 2006-08-15
Publication date: 2008-12-03
Anticipated expiration: 2026-08-15
Also published as: CN1907680A

Abstract

The invention relates to a plastic injection technique, especially the improvement for molding plastic coat hanger, wherein the section chamber mould and section core mould can be closed and separated; when they are closed, they form the coat hanger section chamber between them; pouring the fused plastic from the top of section chamber mould, via the pour open at the top into the coat hanger section chamber, to be solidified and remove the mould; then slicing the plastic coat hanger, and drilling the thin layer at hook hole at the slicing cut. The invention can improve the producing efficiency and reduce the waste material.

Description

Improvement for molding plastic

Technical field

The present invention relates to plastic injection technique, particularly make the forming method of plastic hanger.

Background technology

Existing main flow plastic hanger shape is with reference to shown in Figure 1, and its cross section is inverted U-shaped.The clothes hanger injection mold mainly is made up of swaging die 1 and core mould, is shaped on cast gate runner 4 in swaging die.Existing clothes hanger injection moulding process is: mould cast gate 3 be located at a side of inverted U-shaped bottom, and the swaging die position at clothes hanger die cavity 2 tops is shaped on the passage 5 of loosing core that is used to form the clothes hanger hook hole.Because the cast gate runner is longer, the plastics of fusion need inject along inverted U-shaped path from cast gate 3, and injection pressure is lost bigger, cause filling in from the far-end die cavity of cast gate not plentiful, and the product became uneven influences quality; Because the cast gate runner is long, also prolong relatively cool time, inefficiency; Waste material is many, the cost height, and it is specious that the scar that stays behind the shearing cast gate has also influenced clothes hanger.

Summary of the invention

The purpose of this invention is to provide a kind of cast gate runner weak point, high efficiency, few, the specious improvement for molding plastic of manufactured goods of waste material.

A kind of improvement for molding plastic of the present invention, swaging die can fasten and separate in opposite directions with the core mould, swaging die and core mould form the clothes hanger die cavity between the two when buckling state, it is characterized in that the plastics of fusion are injected from the swaging die top, through the cast gate runner, be injected in the clothes hanger die cavity curing and demolding again from the cast gate that is located at clothes hanger die cavity top.

Described cast gate is located at corresponding to the swaging die position directly over the clothes hanger hook hole of die cavity.

The cast gate runner waste material of the plastic hanger that the demoulding is come out is sheared, and penetrates clothes hanger hook from cast gate, the blanking of cast gate scar nature.

The technical program is because cast gate is located at the swaging die position corresponding to die cavity clothes hanger hook hole, and promptly from the clothes hanger die cavity top injection in inverted U-shaped cross section, the injection distance is short, the cast gate flow channel length is shortened, can shorten the cooling forming time, enhance productivity, reduce waste material, reduce cost; Reduced the injection pressure loss simultaneously, improved injection speed, the product thickness of moulding is even, plentiful, the quality percentage height, and reduce plastic waste, reduce cost; After penetrating clothes hanger hook, clothes hanger does not have the cast gate scar and shows, and is specious.

Description of drawings

Fig. 1 is the gate location schematic diagram of existing clothes hanger injection mold;

Fig. 2 is a pouring gate structure schematic diagram of the present invention;

Fig. 3 is a K place partial enlarged drawing among Fig. 2.

The specific embodiment

With reference to Fig. 2, Fig. 3, clothes hanger mould of plastics of the present invention, mainly contain swaging die 1 and core mould 8, the gap that both fasten between the back constitutes clothes hanger die cavity 2, cast gate 3 is located at the swaging die position corresponding to the clothes hanger hook hole of die cavity 2, connected by cast gate runner 4 between swaging die 1 top and the cast gate 3, cast gate runner 4 replaces prior art to be used to form the passage of loosing core in clothes hanger hook hole.Shooting Technique is identical with the existing clothes hanger technology of making, and different is behind the matched moulds injects the plastics of fusion from swaging die 1 top, through cast gate runner 4, be injected in the clothes hanger die cavity 2 from the cast gate 3 that is located at clothes hanger die cavity 2 tops again, solidifies the back die sinking routinely.Because from the clothes hanger die cavity top start injection in inverted U-shaped cross section, injection path is short.Core mould 8 is penetrated with top and the interior ejector sleeve 7 on top mutually that pushes up of inverted U-shaped die cavity, and both can be movable relatively, and behind swaging die 1 and core mould 8 separated demoldings, by propulsive mechanism, ejector sleeve 7 ejects the plastic hanger of moulding so that injection moulding finishes.The core bar 6 that is positioned at ejector sleeve 7 is used to form the clothes hanger hook hole, slight gap D between core bar 6 tops and the cast gate 3 constitutes the interlayer of die cavity 2 and hook hole, the cast gate runner waste material of the plastic hanger that the demoulding is come out is sheared, the place connects the thin layer D on the hook hole at the shearing scar, penetrate clothes hanger hook, the blanking of cast gate scar nature.

What Fig. 2 represented is single pouring gate structure, mostly is many cast gates situation in the practical application, only needs a sprue is set on swaging die, is branched off into each cast gate runner 4 then and gets final product, and certainly, needs to increase the pressure tonnage of injection machine.

Claims

1, a kind of improvement for molding plastic, swaging die (1) can fasten and separate in opposite directions with core mould (8), swaging die (1) forms clothes hanger die cavity (2) between the two with core mould (8) when buckling state, the plastics of fusion are injected from swaging die (1) top, through cast gate runner (4), be injected in the clothes hanger die cavity (2) curing and demolding again from the cast gate (3) that is located at clothes hanger die cavity (2) top; Described cast gate (3) is located at corresponding to the swaging die position directly over the clothes hanger hook hole of die cavity (2), it is characterized in that the cast gate runner waste material of plastic hanger that the demoulding is come out is sheared, and penetrates clothes hanger hook from cast gate, the blanking of cast gate scar nature.