Shanghai Daoqin Plastics Co., Ltd.

        1, 模垢 形 formed

        几乎 has thermoplastic property plastics injection molding 时都会发生模垢. most product function requirements must mixed related add material 时(例如改质 agent, anti agent and other), molding process in, this add material non can can in surface, 导致形 formed 模垢.

        图: 模垢案例(模垢 is in mold surface upper has material 析出 一 types phenomenon)

        模垢 形 formed also has other causes, most Common causes lower:

        ▶ raw materials hot separation understanding material;

        ▶ injection molding 时, melt flow 极端 剪切 force;

        ▶不适当 排 gas;

        如 upper formed 模垢时常 is different factors combined material, and 寻求发现 this 模垢究竟 is what causes formed and how to anti, non 常 麻烦, and in day rear 才会形 formed.

        2, type 别

        1) various additives generate type 别 模垢. anti agent in high temperature 时会起 reaction, formed separation understanding can can generate product. impact resistant agent in degree high temperature or 极端剪切 force effect/influence lower, will from polymer in separation 离并残留 in surface formed 模垢.

        2) thermoplastic property engineering plastics in material in high temperature lower 熔化, will reduce molding raw materials heat stabilized property, 结果造 formed degradation polymer and separation understanding material combined formed 模垢.

        3) mold upper especially hot parts (如模芯),改质 agent /安定 agent and other additives can can its surface formed 模垢. in 此情形 lower,必 must measures formed more good mold temperature degree control or use especially agent.

         lower table/sheet 格列出造 formed can can causes and anti measures:

        3, 突然发生 模垢 countermeasures

         if 突然发生模垢, can can is due to molding conditions more, or is more different molding raw materials. lower 列建议 has improvement 模垢.

        首先, amount temperature degree and 目视检查熔胶 is has separation understanding phenomenon (如烧焦 pellets). meanwhile molding raw materials is has outer material 质污染, is use same remove raw materials. mold gas 状况.

         again 次, 检查运 as machine: use material color molding raw materials (black remove outer), 约20 separation rear injection molding machine, remove nozzle, base/seat, can can screw 一起拆 remove, raw materials is has pellets, raw materials color comparison, speed 找出模垢 源.

         in many in 发现出令人惊讶 模垢 defect causes. this technology most suitable for relatively small injection molding machine, most large is 40mm screw 直径. 模垢 消 remove also make molding other raw materials 时, made parts quality to improvement. upper countermeasures suitable for has hot runner system molding.

         mold 模垢导致 injection molding made parts appearance defect, especially is has surface made parts, can through machine 喷砂处理进行 made parts surface 修补.

        4, mold maintenance

         use upper has measures method remove 模垢时, must add strong/high mold maintenance and 维护.

         mold surface 模垢形 formed comparison easy remove, therefore and gas 通道必 must 定时清理 and maintenance (例如 in molding production rear). long time 不进行 mold maintenance and 维护, mold formed relatively thick 层模垢 rear remove non difficult and consumption 时.

         injection molding mold maintenance and use agent main/primary has: demolding agent, anti agent, 顶针油, 胶渍清 remove agent, mold agent and other.

        模垢 chemical formed non complex, must use and new methods remove, generally solvent agent and various solvent agent, 烤炉喷 agent, 含咖啡因 柠檬 water and other. type methods has use 清洁模 type use 橡胶.

        5, anti 模垢 建议

         use hot runner molding and hot raw materials 时, melt time will long, increase raw materials separation understanding formed 模垢 风险. for injection molding machine screw 进行清理.

         molding force raw materials use dimensions relatively large runner and gate, more gate can decrease/reduce flow 距离, low injection shot speed degree, reduce formed 模垢 风险.

         has efficiency mold gas can decrease/reduce formed can can, in mold design stage/phase 设置适当 mold gas. 自动清 remove gas system, or can light easy remove 模垢 排 gas methods is most selection, gas system improvement 经常导致 mold upper decrease/reduce.

         in surface cover/cap especially viscous coating, can anti 止模垢 形 formed, 应进行 testing assessment coating 效果.

         mold inner surface titanium nitrogen material can in mold upper formed 模垢.