The main functions of self sealing bag include four aspects: ① convenient use, transportation, management and storage; ② Improve the grade of commodities; ③ High reuse rate, reduce plastic waste and protect resources. The above four points make the self sealing bag in short supply in the market. After a large amount of demand, there is a large number of non-standard production, and the shrinkage rate of self sealing bag is an embodiment. Without good technology and equipment, most of the self sealing bags produced have this problem.

自封袋自身結構的影響：

Influence of self sealing bag on its own structure:

同一自封袋中，壁厚較小的部位的收縮率要小于壁厚較大的部位，遠離嵌件部位的收縮率要大于靠近嵌件部位的收縮率，垂直于流動方向與流動方向的收縮率也是有差別的，一般情況下流動方向收縮率大于垂直于流動方向的收縮率，自封袋受到阻礙方向的收縮率要比無阻礙方向的收縮率要小。

In the same self sealing bag, the shrinkage rate of the part with smaller wall thickness is less than that of the part with larger wall thickness, the shrinkage rate of the part away from the insert is greater than that of the part close to the insert, and the shrinkage rate perpendicular to the flow direction is also different. Generally, the shrinkage rate in the flow direction is greater than that perpendicular to the flow direction, The shrinkage rate of self sealing bag in the blocked direction is smaller than that in the unimpeded direction.

原材料對自封袋收縮率的影響：

Effect of raw materials on shrinkage of self sealing bags:

用不同原材料生產(chǎn)的自封袋的收縮率也是不同的，但是使用相同材質(zhì)生產(chǎn)的不同批次的自封袋收縮率也不相同，這主要是受到了加工生產(chǎn)過程的影響，結晶型的塑料的收縮率要大于無定形的塑料，流動性差的塑料成型收縮率大，流動性好的塑料成型收縮率小，如果在塑料中加入填充料會導致成型的塑料收縮率明顯下降，不加填充物的塑料生產(chǎn)成型后的收縮率更好。

The shrinkage rate of self sealing bags produced with different raw materials is also different, but the shrinkage rate of self sealing bags produced with the same material in different batches is also different, which is mainly affected by the processing and production process. The shrinkage rate of crystalline plastics is greater than that of amorphous plastics, the molding shrinkage rate of plastics with poor fluidity is large, and the molding shrinkage rate of plastics with good fluidity is small, If the filler is added to the plastic, the shrinkage of the formed plastic will be significantly reduced, and the shrinkage of the plastic without filler will be better.

壓力和溫度對自封袋收縮率的影響：

Effect of pressure and temperature on shrinkage of self sealing bag:

壓力過高會使得自封袋的密封增加，導致收縮率減小，如果提升生產(chǎn)自封袋的原材料的溫度，會使得自封袋的體積膨脹，通過壓力入型的物料變少，使得收縮率加大，但是原材料的溫度升高會使得粘度變下，粘度變小會使得型腔內(nèi)的壓力增多，使得自封袋額收縮率減小，所以終會影響自封袋的收縮率的因素取決于壓力和原材料溫度兩者的綜合影響。

Too high pressure will increase the sealing of the self sealing bag and reduce the shrinkage rate. If the temperature of the raw materials producing the self sealing bag is increased, the volume of the self sealing bag will expand, and the materials entering the mold through the pressure will become less, which will increase the shrinkage rate. However, the increase of the temperature of the raw materials will reduce the viscosity, and the decrease of the viscosity will increase the pressure in the mold cavity, The shrinkage rate of self sealing bag is reduced, so the factors that will eventually affect the shrinkage rate of self sealing bag depend on the combined influence of pressure and raw material temperature.

了解了自封袋收縮率不合格的原因之后，我們以后再挑選自封袋的時候一定要選擇規(guī)格標準的，一些殘次品雖然便宜，但是使用起來不方便，有時候還會影響食品的質(zhì)量，那就得不償失了。

After understanding the reasons for the unqualified shrinkage rate of self sealing bags, we must choose the specifications and standards when selecting self sealing bags in the future. Although some defective products are cheap, they are inconvenient to use and sometimes affect the quality of food, so the gain is not worth the loss.

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The above is Jinan self sealing bag http://www.673338.com.cn Thank you for checking the information of our company in your busy schedule. If you want to know more, you are welcome to inquire!