Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With product ejector
Patent
1996-10-25
1998-12-15
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With product ejector
425563, 425564, 425572, B29C 4523
Patent
active
058493441
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an injection molding apparatus, in particular, an injection molding apparatus comprising a plurality of injection nozzles to inject a molten resin wherein the respective distal end portion of the above mentioned plurality of injection nozzles always fits to a nozzle reception portion formed on a mold clamp unit with high accuracy so as to always supply a predetermined amount of molten resin into the mold clamp unit.
BACKGROUND ART
In various industrial fields such as the electric electronic, and automobile industries, the introduction of plastic for various parts is actively conducted aiming at achieving lightweight, low cost and high added value, and advancement of injection molding technology has greatly contributed to this. This is because the injection molding technology is superior to other molding technologies in many aspects such as productivity, stability of quality, and applicability.
Speaking of a general injection molding principle briefly, it is a molding method to make a product by filling a molten resin, plasticized and kneaded by a screw in a heating cylinder (cylinder), into a cavity in a mold processed to have an optional shape at a high speed/high pressure, followed by cooling/solidification, or reaction/solidification.
As one of the major characteristics of the injection molding which are different from the other injection methods, the point that the molding cycle is a comparatively short time, and a plurality of products can be obtained in one molding cycle can be presented. The point is attributed to the fact that in the injection molding, a plurality of cavities are formed inside the mold, and a resin is filled into the above mentioned plurality of cavities during the molten resin injection at one time. However, in recent years, particularly in the injection molding aiming at the resin packaging of semiconductor chips, there is a tendency proceeding that a further improvement of the production efficiency is demanded, and the number of the products obtained in one molding cycle, that is, the number of cavities in the mold is further increased. However, the number of cavities of which inside one injection nozzle can fill with a molten resin by injecting a molten resin at one time is limited, and when the difference of the distance from a sprue to each cavity is remarkable, the degree of filling of the molded products becomes different. In order to eliminate the difference, it is preferable to arrange one injection nozzle for cavities of as small a number as possible. Therefore, recently, a resin is supplied to a plurality of cavities formed in a broad region inside the mold by using an injection unit comprising an injection nozzle having multiple heads (hereinafter abbreviated as a multi-head nozzle), that is, a plurality of injection nozzles to introduce a molten resin from a plurality of positions at the same time into a mold in the mold clamp unit.
In general, in an injection molding apparatus, a nozzle reception portion shaped to have a concave portion is formed at a position required of the frame body of a mold clamp unit comprising a mold so that the distal end portion of the injection nozzle of the injection unit fits thereto to be fixed, and with the initiation of the molding, the injection unit moves so that the distal end portion of the injection nozzle reaches the nozzle reception portion of the above mentioned mold clamp unit, and in the state where the above mentioned distal end portion fits to the nozzle reception portion a molten resin is injected from the injection opening of the above mentioned distal end portion so that the molten resin is introduced to the cavity in a mold via a resin introduction passage of which introduction orifice is formed at the center of the nozzle reception portion. In the above mentioned injection molding apparatus using the injection unit comprising the multi-head nozzle, in general, a plurality of the nozzle reception portions corresponding to respective nozzles of the above mentioned mul
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The Condensed Chemical Dictonary, p. 828, 1981.
"Injection Molding You Want to Know", Nissei Resin Injection Society, Tokyo, Japan, Machinist-sha 1986, p. 110.
Eto Yoshinari
Mori Naoki
Yamaguchi Toyokazu
Heitbrink Tim
Meiho Co., Ltd.
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