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Injection-moulding apparatus with needle valve nozzle

A nozzle and guide sleeve technology, applied in the field of injection molding devices, can solve the problems of damaging the sealing effect, contaminating tools, preventing the opening and closing movement of the closing needle, and achieving the effect of lasting and reliable sealing

Inactive Publication Date: 2009-04-22
GUENTHER HEISSKANALTECHNIK GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Even with such an optimized configuration of the sealing system, due to the relatively high pressure inside the tool and due to the reciprocating movement of the needle, it cannot be avoided that the material to be processed flows out through the guide sleeve or the sealing sleeve
loss of material as a result
In addition, material residues contaminate not only the sealing needle but also the tool, which not only may impair the sealing effect, but may hinder the opening and closing movement of the sealing needle over time
Costly cleaning or maintenance work is unavoidable

Method used

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  • Injection-moulding apparatus with needle valve nozzle
  • Injection-moulding apparatus with needle valve nozzle

Examples

Experimental program
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Effect test

Embodiment Construction

[0023] exist figure 1 Injection molding units, generally identified with 1 in , are used to produce molded parts from flowable materials, such as molten plastics. The injection molding device has a spreader plate 2 and a distribution plate 3 parallel to the spreader plate, in which a system of flow channels 4 is formed. The flow channels 4 each open into needle shut-off nozzles (not shown) mounted on the lower surface 5 of the distribution plate 3 .

[0024] Each needle shut-off nozzle has a preferably externally heated nozzle body (likewise not shown), in which a material tube is formed concentrically with respect to the longitudinal axis L for the continuation of the flow channel 4 . The flow channel 4 terminates in a spray head, which forms a nozzle outlet on the end side, via which a separable mold insert (likewise not shown) is supplied with the material to be treated via the casting opening.

[0025] For opening and closing the casting opening, which is preferably form...

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PUM

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Abstract

An injection-moulding apparatus (1) with a feed plate (3) has at least one flow channel (4) with at least one needle valve nozzle which is intended for a flowable material and by virtue of which the flowable material can be fed, with continuation of the flow channel (4), to a separable mould insert. A shut-off needle (20) with a guide bush (30) for conduct and sealing of the shut-off needle (20), which can be brought by means of a drive into an open position and into a closed position, passes through the flow channel (4) at least in sections with capability for longitudinal displacement. For further improvement of the guiding and sealing of the shut-off needle (20), there is, within the guide bush (30), a ring element (60) composed of resilient elastic heat-resistant plastic encompassing and in contact with the shut-off needle (20).

Description

technical field [0001] The invention relates to an injection molding device with a needle shut-off nozzle according to the preamble of claim 1 . Background technique [0002] Needle shut-off nozzles are used in injection molding units to feed a flowable mass at a predeterminable temperature under high pressure to a separable mold insert. They have closing pins, mostly pneumatically or hydraulically driven, which periodically open and close the casting openings in the mold inserts. This achieves the most precise dosing of material, especially when shooting in rapid succession. The flowable mass can also be injected in sections, for example in cascade casting. [0003] Each shut-off needle is supported in an axially displaceable manner in the tool-side region of the injection molding device, while in the nozzle-side region each shut-off needle preferably passes centrally through a flow channel for the material to be processed ( See, for example, DE 32 49 486 C3 or DE 34 03 ...

Claims

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Application Information

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IPC IPC(8): B29C45/28
CPCB29C45/2806B29C2045/2889B29C45/23B29C45/28
Inventor 赫伯特·君特
Owner GUENTHER HEISSKANALTECHNIK GMBH