影響自封袋縮水率的影響要素有哪些？

一、自封袋自身構(gòu)造的危害

1、 The hazards of the self sealing bag's own structure

同一自封袋中，厚度比較小的方位的縮水率要低于厚度比較大部位，避開鑲件方位的縮水率遠(yuǎn)大于挨近鑲件方位的縮水率，筆直在流動性方位與流動性的方向縮水率是有區(qū)別的，一般情況下流動性方位縮水率超過筆直在流動性的方向縮水率，自封袋遭受阻攔的方向縮水率會比無阻攔的方向縮水率要低。

In the same self sealing bag, the shrinkage rate in the direction with smaller thickness is lower than that in the direction with larger thickness. The shrinkage rate in the direction avoiding the insert is much higher than that in the direction close to the insert. There is a difference in shrinkage rate between the flow direction and the flow direction in the straight direction. Generally, the shrinkage rate in the flow direction is higher than that in the straight direction, and the shrinkage rate in the direction where the self sealing bag is obstructed will be lower than that in the unobstructed direction.

二、質(zhì)料對自封袋縮水率發(fā)生的影響

2、 The influence of materials on the shrinkage rate of self sealing bags

用不同質(zhì)料制作的自封袋的縮水率也是不一樣的，但是應(yīng)用相同資料制作的不一樣出產(chǎn)批次自封袋縮水率也有所不同，主要是得到了出產(chǎn)加工加工進(jìn)程發(fā)生的影響，結(jié)晶型塑料的縮水率遠(yuǎn)大于不定形塑料，流通性差塑膠成型縮短率大，流通性好塑料成型縮短率小，若是在塑膠里加入填充物也會導(dǎo)致成形的塑料縮短率顯著下降，不含有填充料的塑料出產(chǎn)成形后縮水率更強。

The shrinkage rate of self sealing bags made from different materials is also different, but the shrinkage rate of self sealing bags made from the same materials in different production batches also varies. This is mainly due to the impact of the production and processing process. The shrinkage rate of crystalline plastics is much higher than that of amorphous plastics, with poor flowability. Plastic with good flowability has a larger shrinkage rate, while plastic with good flowability has a smaller shrinkage rate. If fillers are added to plastic, it will also lead to a significant decrease in the shrinkage rate of formed plastics. Plastics without fillers have a stronger shrinkage rate after production.

三、和壓力環(huán)境溫度對自封袋縮水率發(fā)生的影響

3、 The influence of pressure and ambient temperature on the shrinkage rate of self sealing bags

工作壓力太高會使自封袋的密封性進(jìn)步，造成縮水率削減，假設(shè)進(jìn)步出產(chǎn)制作自封袋的質(zhì)料溫度，會使自封袋的吸水膨脹，根據(jù)工作壓力入型原資料削減，促進(jìn)縮水率擴(kuò)大，但是質(zhì)料的溫度上升會使黏度變下，黏度縮小會使凹模內(nèi)壓力增加，促進(jìn)自封袋額縮水率削減，因此充分考慮，危害自封袋的縮水率的影響要素在于和壓力質(zhì)料環(huán)境溫度二者綜合危害。

Excessive work pressure can improve the sealing performance of self sealing bags, leading to a reduction in shrinkage rate. Assuming that the temperature of the materials used to produce self sealing bags is increased, it will cause water absorption and expansion of the self sealing bags. According to the original data of the work pressure, it will be reduced to promote an increase in shrinkage rate. However, an increase in temperature of the materials will cause a decrease in viscosity, and a decrease in viscosity will increase the pressure inside the mold, promoting a reduction in shrinkage rate of the self sealing bags. Therefore, it is fully considered that the factors affecting the shrinkage rate of self sealing bags are the combined harm of the pressure material environment temperature.

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