Shanghai Daoqin Plastics Co., Ltd.

亚克 force Scientific Names is polymethyl methacrylate (PMMA) （英文简称PMMA）. due to PMMA surface hardness high, easy scratch 毛, impact resistant property can low, molding flow property can and other disadvantages, PMMA modified versus 继出现. methacrylic acid ester and styrene, butadiene copolymer, PMMA and PC blending and other. 372亚克 force is methacrylic acid ester and styrene copolymer 而. if in 372亚克 force in add a small amount of 丁腈橡胶(约50%)即 can formed 373亚克 force.

　　PMMA flow ratio PS, ABS差, melt viscosity for temperature degree comparison 敏感, in molding process in, main/primary from injection temperature degree 手 改变 melt viscosity. PMMA is 无定形 polymer, temperature degree large 于160℃, separation understanding temperature degree 达270℃.

　　1, plastics 处理

　　PMMA tool has 一定 吸 water property, its water absorption 达0.3-0.4%, injection molding must in 0.1% below/following temperature degree, usually is 0.04%. water 份 存 in make melt bubbles, gas marks, transparent degree reduce and other. therefore need drying 处理. drying temperature degree 80-90℃, time is 3 small above.

　　 recycling material in certain lower can 100% use, 实际份 amount need quality requirements 而定, usually can 30%, recycling material need 避免污染否则会 effect/influence transparent degree and formed product property 质. force

　　2, injection molding machine selection

　　PMMA for injection molding machine has especially requirements. is its melt viscosity large, need relatively deep and relatively large 直径 射嘴孔. if for products strong/high degree requirements relatively high, need use relatively large long ratio screw low temperature 塑化. another PMMA一定 need use drying material material.

　　3, mold and gate design

　　模肯 temperature degree can is 60℃-80℃, runner 直径应配 combined inner degree, most 佳 角 degree is 5°至7°, need injection molding 4mm or above products, degree is 7°, runner 直径达8至10mm, gate overall long degree need ultra- 50mm.

　　 for/regarding thick small 于4mm products, runner 直径应 is 6-8mm

　　 for/regarding thick large 于4mm products, runner 直径应 is 8-12mm

　　 for 边形, and sheet/slice gate deep degree is 0.7至0.9t(t is products thick degree), gate 直径应 is 0.8至2mm; low viscosity selection relatively small dimensions.

　　 Common gas has 0.05至0.07mm deep, 6mm wide

　　 demolding degree is 30′-1° type separation 35′-1°30° between.

　　4, temperature degree can use for injection method amount degree: 由210℃-270℃不 and other, specific supply provide material 而定.

　　5, injection temperature degree

　　 can use fast speed injection, need generate high degree internal stress, use more grade injection, slow - fast - slow and other, injection molding thick parts 时, using/adopting slow speed.

　　6, time

　　若 temperature degree is 260℃, time most more ultra- 10 separation 钟, temperature degree is 270℃, time can ultra- 8 separation 钟