Mold for injection molding, and manufacturing method for rubber product molded by using same

Abstract

The present invention provides a mold for injection molding, and a manufacturing method for a rubber product molded by using the same. The mold can prevent rubber in a sprue portion from fracturing at the root of the rubber and residing in the sprue portion. A mold main body is divided into a product forming region and a rubber material feeding region, wherein the product forming region is provided with a mold cavity for forming the rubber product and a heater for heating and vulcanizing the rubber materials in the mold cavity; and the rubber material feeding region is provided with a rubber feeding flow path comprising a cooling runner portion, a sprue portion and a pouring gate portion. A thermal baffle plate is disposed between the product forming region and the rubber material feeding region. The thermal baffle plate inhibits the temperature of the rubber materials in the sprue portion, the runner portion and the pouring gate portion from increasing.

Description

technical field [0001] The present invention relates to a mold for injection molding that prevents the rubber in the sprue portion exposed from the rubber product from being broken at its root and remaining in the sprue portion (inside the mold) when the rubber product is removed from the mold, and a method using the mold Methods of manufacture of rubber products. Background technique [0002] E.g Figure 7 As shown in (A) and (B), in the injection mold A for injection molding the rubber product W, the rubber material is filled in the cavity c for forming the rubber product through the rubber supply flow path b, and the rubber material The supply channel b includes a cold runner (not shown), a sprue b1 , a runner b2 , and a gate b3 . Furthermore, the filled rubber material is heated and vulcanized in the cavity c, whereby the rubber product W is formed. [0003] Here, when the rubber product W is removed from the mold A, in order to make the rubber g in the sprue portion b...

AI Technical Summary

Problems solved by technology

[0004] However, in the case of the rubber product W, there is a problem that when the rubber product W is removed from the mold A, the exposed rubber g breaks at the root j of the sprue portion b1, and the rubber in the sprue portion b1 g1 remains on the mold side and cannot be taken out

In addition, the rubber g1 remaining in the sprue part b1 becomes a cause of a decrease in productivity, such as the inability to perform continuous automatic molding, so it must be removed.

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