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Moulding foamed products, its forming method and loudspeaker diaphragm constituted therewith

A foamed product and speaker technology, applied in the field of molded foamed products, can solve the problem of high cost

Inactive Publication Date: 2003-08-20
PIONEER CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] As a solution to meet the above requirements, it seems feasible to color molded foam products and loudspeaker diaphragms with different pigments, however, coloring poses a problem of high cost

Method used

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  • Moulding foamed products, its forming method and loudspeaker diaphragm constituted therewith
  • Moulding foamed products, its forming method and loudspeaker diaphragm constituted therewith
  • Moulding foamed products, its forming method and loudspeaker diaphragm constituted therewith

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Embodiment Construction

[0033] Preferred embodiments of the present invention are explained below with reference to the accompanying drawings.

[0034] figure 1 is a cross-sectional view of a molded foamed article according to the present invention, wherein a molded foamed article 1 is formed with a foamed region 4 of a three-layer structure consisting of a foamed inner layer 3 and a non-foamed outer layer (skin layer 2) and A non-foaming region 5 of a single-layer structure composed of a non-foaming layer (skin layer 2 ) is formed.

[0035] Such as figure 1 As shown, when light A irradiates the molded foam product 1 , part of the light A is reflected on the surface as reflected light B, and the rest of the light A becomes transmitted light C and penetrates into the molded foam product 1 .

[0036] In the non-foaming region 5, the transmitted light C continues to pass through the molded foamed article 1, as a result of which the color tone of the reflected light B is given in the non-foaming region...

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Abstract

A molded foam resin, surface of which can be designed easily at low cost, a process for forming a molded foam resin, and a speaker diaphragm made of molded foam resin are provided, in which a molded foam resin is formed by injection molding of foaming agent-containing resin and has a foamed zone having a three layer-structure consisting of a foamed layer inside and a non-foamed layer outside and a non-foamed zone having a single layer-structure consisting of a non-foamed layer. The process for forming the molded foam resin according to the present invention includes the steps of injecting a foaming agent-containing resin into a mold and opening the mold after a lapse of a designated period of time after the completion of the injection, in which a cavity of the mold contains a thick space corresponding to the foamed zone and a thin space corresponding to the non-foamed zone, and the designated period of time is chosen so that a curing of the resin filled into the thin space is completed and a curing of the resin filled into the thick space is not completed.

Description

technical field [0001] The present invention relates to a molded foamed product injection-molded from a resin containing a foaming agent, its molding method and a loudspeaker vibrating film produced therefrom. Background technique [0002] In Japanese Patent Application Unexamined Publication Nos. H8-207074 and H8-340594, a method for injection molding a foamed product using a resin containing a foaming agent and a method for manufacturing a foamed product from the molded foamed product are disclosed. speaker diaphragm. [0003] In the above-mentioned patent application, a method is shown in which a resin containing a blowing agent is injected into a mold, and then the mold is opened after a specified time interval has elapsed after completion of the injection, during which time intervals near the inner surface of the mold Part of the resin is cured and part of the resin at a certain distance from the inner surface is not cured. Therefore, the uncured resin portion is allo...

Claims

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Application Information

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IPC IPC(8): H04R7/02B29C33/42B29C44/04B29C45/00B29C45/26B29K105/04B29L31/38H04R31/00
CPCH04R2307/029H04R31/003B29C44/0415
Inventor 佐藤政敏小林美隆中园次郎
Owner PIONEER CORP
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