Shanghai Daoqin Plastics Co., Ltd.

         demolding large small is has 一定 准则, more is experience and product deep degree 决定. in addition, molding methods, thick and plastics selection in 考虑之列.

         generally 说, for product 任何一 侧面, has amount demolding degree, product from mold in 顺利脱出. demolding degree large small generally 以0.5°～1°居 more.

         specific selection demolding degree attention/notes below/following 几点:

        塑 parts surface is light 面, dimensions degree requirements high, shrinkage rate small, selection relatively small demolding degree, 如0.5°.

         relatively high, relatively large dimensions, according to 实际计算取 relatively small demolding degree.

        塑 parts shrinkage rate large, selection relatively large degree value.

        塑 parts thick relatively thick 时, make molding shrinkage increase large, demolding degree using/adopting relatively large value.

         transparent parts demolding degree add large, 以免引起划伤. generally lower, PS material demolding degree less 于2.5°～3°, ABS and PC material demolding degree small 于1.5°～2°.

         belt/tape 皮纹, and other appearance 处理 塑 parts 侧壁应 according to specific 情况取2°～5° demolding degree, specific deep degree 而定. deep degree deep, demolding degree large.

         structure design formed for 插时, 插穿面斜 degree generally is 1°～3°.

        取斜 degree direction, generally inner small is 准, combined 图样, degree expand large direction 取, outer large is 准, combined 图样, degree shrink small direction 取.

         generally lower, demolding degree 不包括 in parts scope/range inner.

         outer housing/shell demolding degree large and other 于3°. remove outer housing/shell outer, housing/shell its 余特征 demolding degree 以1° is standards demolding degree. especially can according to lower 面 原则 取: low 于3mm high add strong/high demolding degree 取0.5°, 3～5mm取1°, its 余取1.5°; low 于3mm high demolding degree 取0.5°, 3～5mm取1°, its 余取1.5°.

        2, parts thick 确定以 and thick 处理

         combined 理 确定塑 parts thick is very important. parts thick 首先决定于塑 parts use requirements: parts strong/high degree, quality cost, electrical properties, dimensional stability and assembly and other requirements, generally thick has experience value, similar can 确定.

         its in attention/notes lower:

        塑 parts thick amount uniform, 避免太 thin, thick and thick 突变, parts requirements must has thick 变化, using/adopting or 圆弧 渡, 否则会因引起 shrinkage non-uniform make parts deformation, effect/influence parts strong/high degree, effect/influence injection molding flow property and other molding process issues. thick thin 差别尽 amount control in basic thick 25%以 inner, 整 部 parts most small thick small 于0.4mm, 且该处背面不 is A grade appearance 面, requirements 面积不 large 于100mm².

        塑 parts thick generally in 1～5mm scope/range inner. most commonly used value is 2～3mm.

        尽 amount need will add strong/high and 螺钉柱 design thick, generally 建议取本体壁 thick semi relatively 保险, 否则容 easy shrink and other appearance issues.

        尽 amount need will parts design formed mono 独 平 sheet/plate, dimensions very small 另论, deformation parts 不平整.

         plastics products most small thick and Common thick recommendation value lower table/sheet: