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Sheet for regenerating a mold

A technology for molds and sheets, which is applied in the field of sheets for mold regeneration, can solve the problems of rough surface of molded products, lower mold release performance of molded products, etc., and achieve the effects of improving filling performance, improving filling performance, and improving cleaning performance

Active Publication Date: 2012-01-04
RESONAC CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of dirt reduces the release property when taking out the molded product from the mold, and also causes surface roughness on the surface of the molded product, etc.

Method used

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  • Sheet for regenerating a mold
  • Sheet for regenerating a mold
  • Sheet for regenerating a mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0099] On both sides of the above-mentioned substrate sheet (Japanese traditional paper, non-woven fabric), protrusions are provided in the pattern (band shape, grid shape, spot shape) and size (width, thickness, gap) shown in Table 1 below. The mold cleaning material described above.

Embodiment 8～15

[0101] On both surfaces of the above-mentioned substrate sheet (plastic sheet), the above-mentioned mold cleaning material was protrudingly provided in the pattern (belt shape, grid shape, spot shape) and size (width, thickness, gap) shown in Table 2 below.

Embodiment 16～21

[0103] On both sides of the above-mentioned substrate sheet, the above-mentioned mold cleaning material is formed into a strip pattern (see Figure 7 ), so that its cross-sectional shape [see Figure 10 (a) to (e)] and dimensions (width, thickness, radius of curvature of the top, gap) are shown in Table 3 below. In addition, the radius of curvature of the top is the radius of curvature on a cross section perpendicular to the longitudinal direction of the stripe pattern.

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PUM

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Abstract

A sheet for regenerating a mold capable of easily venting air in a cavity and exhibiting excellent filling property includes: a substrate sheet formed of one of a paper sheet, a cloth sheet, and a plastic sheet; and a mold cleaning material containing as a main component an unvulcanized rubber-based composition, projecting in a predetermined pattern having an air vent gap, and formed on at least one side of the substrate sheet.

Description

technical field [0001] The present invention relates to a mold recycling sheet used for cleaning the mold surface of a molding mold. Background technique [0002] In the process of resin-encapsulating semiconductor elements by transfer molding, resin molding using molds is usually repeated. And as the number of repetitions (number of injections) increases, the surface of the mold, especially the surface of the cavity, will accumulate dirt such as components, flashes, and dust that seep out of the resin. Such fouling degrades the releasability when the molded product is taken out from the mold, and also causes surface roughness on the surface of the molded product. Therefore, every time a certain number of molding repetitions (number of injections) is reached, the mold surface (cavity surface) must be cleaned. [0003] As this cleaning method, a method using a cleaning sheet has been proposed (for example, see Patent Document 1). The method is as follows: Clamp the mold wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C33/72B29C33/10
Inventor 高岛浩一
Owner RESONAC CORPORATION