Shanghai Daoqin Plastics Co., Ltd.

熔接缝熔 melt plastics in type in due to to parts 孔洞, speed 不连贯 区域, material in 断 区域而以 more 股形式汇 combined, this type of low temperature material versus combined can full combined generate property 熔接缝, in addition in gate 喷射充模也会生 formed 熔接缝. this type of 熔接痕 发生 in material combined 部位（ use gate, has make material from 2 direction combined products generally has 熔结痕）, is 说, in belt/tape molding made parts, or more gate molding made parts, strong/high degree low its it separation. and other made parts 熔接痕出现 in in 心, for strong/high degree and appearance has effect/influence. 熔结痕同 cracks separation need in products upper coating upper water can separation 开; has this phenomenon, in 熔结痕 方也容 easy generate flash. this is table/sheet in 熔结痕 方材 material pressure to relatively high degree. positive is in 熔结痕 方 very less 会发生凹痕.
if 想避免熔接痕 can gate make 熔结痕发生 in 不显眼 or 看起 顺眼 位置. mold upper 销（ in products upper 孔） generally 都会发生熔结痕. has use this type of methods: make generate 熔结痕 方发生 in products more thin sheet/slice upper, rear again thin sheet/slice 切断. 熔接痕 detailed 情况叙述如 lower. analysis lower:
1, mold 方面:
熔接痕 generate and gate, made parts has 关, can remove it to effect/influence appearance quality 位置. is 此, type gate more, decrease/reduce gate or for 称设置, or amount 靠近熔接缝设置; 熔接缝处排 gas defect, 应开设排 gas system; large, system dimensions 不当, gate 开设尽 amount melt in parts 孔洞周围 flow, or amount less use parts; thick large, or thick thin, make made parts thick uniform; necessary in 熔接缝处开设溢 material 槽, molding rear 予以切断 remove or design formed 自动脱离 潜式.
2, process 方面:
injection pressure, speed degree low, material temperature degree, mold temperature low, formed 进入 plastics raw materials Knowledge mold melt material cooling 而出现熔接缝; injection pressure, speed degree high 时, 会出现喷射而出现熔接缝; increase speed, increase back pressure pressure make plastics viscosity decline, density increase; plastics need drying good, recycled material less use, demolding agent use amount more or quality good 也会出现熔接缝; reduce clamping force, 方便排 gas.
3, plastics 方面:
熔 material flow property can rise high material temperature degree high flow property; add fast injection speed degree make material drop temperature to combined 处, rise high mold temperature degree decrease/reduce material drop temperature; expand large gate or add thick to combined 处路径 upper made parts thick, decrease/reduce flow retardant force. use flow property good plastics has decrease light 熔接痕. using/adopting more gate molding 时肯定会 generate 熔接痕, use mono gate can molding 时, can can generate 熔接痕. for flow property or hot property plastics 应适当添 add lubricant and stabilizer; plastics 含 杂质 more, necessary need quality good plastics.
4, in gas or formed separation
熔接痕 although upper is difficult 免, in material flow 时首先应 空 gas or formed separation troubleshooting 掉. if gas 不畅, 熔接痕当然变 obvious. this type of 情形严 heavy also 会引起 filling or 烧伤(参照 filling 不足, 烧伤); to has this type of can can 时, has necessary utilizing parts 缝隙排 gas or 设置排 gas 孔道, for/regarding gas formed 熔接痕恰 good and usually remove 熔接痕 methods versus 反, has 时甚至 need reduce injection speed degree can make 熔接痕不 obvious.
5, demolding agent formed 简略

6, color agent formed 简略