Molding tools for the production of components in the gas-assisted injection molding process
A molding tool and injection molding technology, applied in the field of molding tools, can solve the problems of high investment cost, high cleaning cost, excessive injection, etc., and achieve the effect of high process reliability, low maintenance cost and increased efficiency
Inactive Publication Date: 2018-06-15
ILLINOIS TOOL WORKS INC
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
The disadvantage is that plastic melt can enter the relatively large opening of the hydraulic injector, i.e. over-injection occurs
Moreover, there are high investment costs, complex operations, and there are high cleaning costs
Method used
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[0022] Unless otherwise stated, the same symbols refer to the same subjects in the figures. The molding tool according to the invention shown schematically in the figures has a first mold half 10 and a second mold half 12 in the depicted example. The first half-mould 10 and the second half-mould 12 are movable relative to each other in a manner not shown and form a figure 1 In the mold cavity indicated by the symbol 14, the inner wall of the mold cavity reproduces the contour of the component to be produced in the gas-assisted injection molding process with the molding tool according to the invention. The plastic melt can be injected into the mold cavity 14 by means of a molding tool, not shown in the drawing, known per se.
[0023] The molding tool according to the invention further comprises an injection device with a pressurized gas source, which is not shown in the figures. The injection device in the depicted example comprises a cylindrical piston 16 movable in its long...
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Abstract
A molding tool for producing components in a gas-assisted injection molding process includes a mold cavity and an injection device with a source of pressurized gas. Pressurized gas is supplied to the plastic melt which is introduced into the mold cavity. The plastic melt is compressed against the inner walls of the mold cavity. The injection device has a plunger with a syringe head and is movably guided in a channel of a molding tool connected to the mold cavity. The syringe head forms part of the inner wall of the mold cavity in the rest position of the piston and is pressed into the plastic melt when the piston is moved to its operative position so that pressurized gas flows through the channel into the plastic melt in the mold cavity. The piston can be moved by gas supplied through the channel into the plastic melt.
Description
technical field [0001] The invention relates to a molding tool for producing components in a gas-assisted injection molding process, comprising: a mold cavity, the inner wall of which reproduces the outline of the component to be produced; molding means, with which a plastic melt can be introduced into the cavity and an injection device with a pressurized gas source, with which pressurized gas can be supplied to the plastic melt introduced into the mold cavity, wherein the plastic melt is pressed against the inner wall of the mold cavity. Background technique [0002] In the gas-assisted injection molding process, first, a plasticized plastic melt is injected into the cavity of a molding tool. High-pressure gas is then introduced into the plastic melt by means of an injection device, wherein the gas forms gas bubbles in the plastic melt and the plastic melt is pressed against the walls of the mold cavity and possibly into branch regions of the mold cavity. In this way, part...
Claims
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IPC IPC(8): B29C45/17
CPCB29C45/1734B29C2045/1729B29C2045/1737B29C45/18B29C45/2725B29C45/1603
Inventor 埃尔马·弗里斯
Owner ILLINOIS TOOL WORKS INC