| 摘要 |
PURPOSE:To prevent the generation of a burr on a rule part and a notch part, by injecting a specific resin in a mold having a specific mold structure to form a developing plate having a specific shape. CONSTITUTION:A developing plate, wherein an area is 100cm<2> or more, an average plate thickness is 0.3-2.0mm, an average thickness of a rule part is 0.15-1.0mm and a notch part is provided, is formed by using a thermoplastic resin of which the melt index is 16-60g/10min. In a mold, one mold A has a wall surface deeper than the objective thickness of a cavity as a recessed mold and the other opposed side mold B being a projected mold having a side wall extending along the wall surface of said mold A is fitted to the mold A to constitute a mold structure forming an objective thickness. When a resin is injected in the cavity and injection pressure is larger than a clamp pressure and a mold open (a) is generated, the engagement part of the molds A, B forms a mold open (b) and relation of b<a is formed. Therefore, the part of the mold open (b) is high in flow resistance to allow an almost unnoticeable penetration and, when the resin is soldified, a longitudinal almost unnoticeable, burr is formed, so it is unnecessary to remove it.
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