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注塑加工对环境的要求有哪些?

来源:http://www.sdlqmj.com/ 日期:2022-01-20

一、模貝温度的影响。注塑加工成形中的温度以模貝温度对制品规格精密度影响很大。模貝温度是根据熔化态高分子的趋向与结晶度大小,立即影响制品收缩率转变,进而引起规格偏差。
I. The Influence of mould temperature. The mold shell temperature has a great influence on the specification precision of products in injection molding. The mold shell temperature immediately affects the shrinkage change of the product according to the trend and crystallinity of the molten polymer, and then causes the specification deviation.
针对非结晶形树脂,模温高,溶体冷却慢,分子有充足的松驰時间,结晶趋向更完整,结晶度高,使收缩增加。 但对结晶形树脂,注塑加工全过程中,高模温可减少后收缩,使制品规格平稳。
For the amorphous resin, the mold temperature is high, the cooling of the solution is slow, the molecules have sufficient relaxation time, the crystallization tends to be more complete, the crystallinity is high, and the shrinkage increases. However, for crystalline resin, in the whole process of injection molding, high mold temperature can reduce post shrinkage and make the product specification stable.
模温低,则制冷快,溶体分子结构被冻洁趋向赶不及松驰,不容易结晶体,容积转变小,制品收缩小。但低模温使制品后收缩增加,收缩時间延长,不容易平稳注塑加工件的规格。 温度是结晶体全过程中比较敏感的要素,温度差1℃结晶体速率可相距好几倍。模貝温度不匀或不稳定,立即影响结晶度大小尺寸,进而使注塑加工制品收缩造成规格偏差。
If the mold temperature is low, the refrigeration is fast, the molecular structure of the solution tends to be frozen and cleaned, and it is not easy to relax, the crystal is not easy, the volume transformation is small, and the shrinkage of the product is small. However, low mold temperature increases the post shrinkage of products and prolongs the shrinkage time, which is not easy to stabilize the specification of injection molded parts. Temperature is a sensitive factor in the whole process of crystallization. The crystallization rate can be several times with a temperature difference of 1 ℃. Uneven or unstable mold shell temperature will immediately affect the crystallinity and size, and then shrink the injection molded products, resulting in specification deviation.
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二、打针压力的影响。打针压力的变化导致制品尺寸的颠簸。其它注塑加工工艺参数不变时,进步打针压力,可改善熔体充模活动性,增加活动长度,充模速度加快,制品密实,收缩减小,但易产生取向应力。压力低时,制品得不到充分压实,收缩加大。
2、 Effect of injection pressure. The change of injection pressure leads to the fluctuation of product size. When other injection molding process parameters remain unchanged, increasing the injection pressure can improve the melt filling activity, increase the active length, accelerate the filling speed, compact the product and reduce the shrinkage, but it is easy to produce orientation stress. When the pressure is low, the product can not be fully compacted and the shrinkage increases.
三、保压压力的影响。保压压力对稳定制品尺寸有重要作用,在注塑加工过程中,进步保压压力,可对模内制品的收缩进行补料压实,减小收缩。但保压压力太高,会造成制品脱模时的残余应力增大,惹起变形或开裂,影响制品尺寸。
3、 Effect of holding pressure. The holding pressure plays an important role in stabilizing the size of products. In the process of injection molding, increasing the holding pressure can supplement and compact the shrinkage of products in the mold and reduce the shrinkage. However, if the holding pressure is too high, it will increase the residual stress during demoulding, cause deformation or cracking, and affect the size of the product.
四、打针时间的影响。在浇口关闭前,打针时间越短,收缩率越大,并且收缩率的变化幅度也越大;当打针时间达到或超过浇口的凝固时间时,即使再延长打针时间,注塑加工制品质量和收缩率也不再发生变化,打针时间控制与所设计的浇口厚度关系亲切,浇口厚度能够在非常大程度上左右浇口关闭时间。
4、 Effect of injection time. Before the gate is closed, the shorter the injection time is, the greater the shrinkage is, and the greater the change range of shrinkage is; When the injection time reaches or exceeds the solidification time of the gate, even if the injection time is extended, the quality and shrinkage of injection molded products will not change. The injection time control has a close relationship with the designed gate thickness, and the gate thickness can control the gate closing time to a great extent.
五、保压时间的影响。保压时间越长有利于熔体补塑压实,注塑加工件密度越大,收缩率越小。当浇口凝封后,保压对注塑加工制品收缩的减小不复兴作用,过长的保压时间会延长成型周期。
5、 Influence of holding time. The longer the holding time is conducive to the plastic filling and compaction of the melt. The greater the density of the injection molded parts, the smaller the shrinkage. When the gate is sealed, the pressure holding has no effect on the reduction of shrinkage of injection molded products, and too long pressure holding time will prolong the molding cycle.

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