| 塑料制品有熔接缝的原因分析 |
| 添加时间：2018/10/25 16:46:48 浏览次数： |
| 熔融塑料在型腔中由于遇到嵌件孔洞、流速不连贯的区域、充模料流中断的区域而以多股形式汇合时，因不能完全熔合而产生线性的熔接缝。此外在发生浇口喷射充模也会生成熔接缝，熔接缝处的强度等性能很差。主要原因分析如下： Linear welds are formed when melted plastics converge in multiple strands in the cavity due to holes in the insert, incoherent flow velocity and interruption of the flow of filling materials. In addition, there will be a weld seam when the gate jet is filled, and the strength of the weld joint is very poor. The main reasons are as follows: 1．加工方面： 1. processing aspect: （1）注射压力、速度过低，料筒温度、模温过低，造成进入模具的融料过早冷却而出现熔接缝。 (1) Injection pressure, speed is too low, the barrel temperature, mold temperature is too low, resulting in the melt into the mold premature cooling and weld. （2）注射压力、速度过高时，会出现喷射而出现熔接缝。 (2) when the injection pressure and speed are too high, there will be spray and weld seam. （3）应增加转速，增加背压压力使塑料粘度下降，密度增加。 (3) speed should be increased and back pressure should be increased to reduce viscosity and increase density. （4）塑料要干燥好，再生料应少用，脱模剂用量太多或质量不好也会出现熔接缝。 (4) Plastics should be well dried, recycled materials should be used less, the amount of mold release agent too much or poor quality will also appear weld. （5）降低锁模力，方便排气。 (5) reduce clamping force to facilitate exhaust. 2．模具方面： 2. mold aspects: （1）同一型腔浇口过多，应减少浇口或对称设置，或尽量靠近熔接缝设置。 (1) if the gate of the same type is too large, gate or symmetrical setting should be reduced, or as close to the weld seam as possible. （2）熔接缝处排气不良，应开设排气系统。 (2) exhaust joints at the weld seam are poor, and exhaust system should be set up. （3）浇道过大、浇注系统尺寸不当，浇口开设尽量避免熔体在嵌件孔洞周围流动，或尽量少用嵌件。 (3) If the runner is too large and the size of the pouring system is improper, the runner should be set up to avoid melt flowing around the hole of the insert or to use fewer inserts. （4）壁厚变化过大，或壁厚过薄，应使制件的壁厚均匀。 (4) the wall thickness is too large or the wall thickness is too thin, so the wall thickness of the parts should be uniform. （5）必要时应在熔接缝处开设熔合井使熔接缝脱离制件。 (5) if necessary, a fusion well should be opened at the weld seam to separate the weld seam from the workpiece. 3．塑料方面： 3. Plastics: （1）对流动性差或热敏性的塑料应适当添加润滑剂及稳定剂。 (1) suitable lubricants and stabilizers should be added to plastics with poor fluidity or heat sensitivity. （2）塑料含的杂质多，必要时要换质量好的塑料。 (2) plastic contains many impurities, and when necessary, it should be replaced with good quality plastic. |
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