The production process of plastic bags mainly includes the following points:

淤浆法。在稀释剂（如己烷）中聚合，是早工业化也是迄今生产量大的方法。

Slurry method. Polymerization in a diluent (such as hexane) is an early industrial and yet highly productive method.

液相本体法。在70℃和3MPa的条件下，在液体丙烯中聚合。

Liquid phase bulk method. Polymerize in liquid propylene at 70 ℃ and 3MPa.

气相法。在丙烯呈气态条件下聚合。后两种方法不使用稀释剂，流程短，能耗低。液相本体法现已显示出后来居上的优势。

Gas phase method. Polymerization occurs under gaseous conditions of propylene. The latter two methods do not use diluents, have a short process and low energy consumption. The liquid phase bulk method has now shown the advantage of coming from behind.

胶袋根据制成的胶袋款式不同，可以分为PE平口袋，PE沿线袋，PE自粘袋，PE拉链袋，PE铁骨袋，PE自封袋，PE风琴袋，PE手挽袋

Plastic bags can be divided into PE flat bags, PE along the line bags, PE self-adhesive bags, PE zipper bags, PE iron bone bags, PE self sealing bags, PE organ bags, and PE hand bags according to the different styles of plastic bags made

胶袋的成型特性：

Forming characteristics of plastic bags:

结晶料,吸湿性小,易发生融体破裂,长期与热金属接触易分解。

Crystalline materials have low hygroscopicity and are prone to melt rupture. They are prone to decomposition in long-term contact with hot metals.

流动性好,但收缩范围及收缩值大,易发生缩孔.凹痕,变形。

Good flowability, but with a large shrinkage range and value, it is prone to shrinkage, dents, and deformation.

冷却速度快,浇注系统及冷却系统应缓慢散,并注意控制成型温度.料温低温高压时容易取向,模具温度低于50度时,塑件不光滑,易产生熔接不良,流痕,90度以上易发生翘曲变形。

Cooling speed is fast, the pouring system and cooling system should be slowly dispersed, and attention should be paid to controlling the molding temperature. When the material temperature is low and high pressure, it is easy to orient. When the mold temperature is below 50 degrees, the plastic part is not smooth, and it is prone to poor fusion, flow marks, and warping deformation above 90 degrees.

塑料壁厚须均匀,避免缺胶,尖角,以防应力集中。

The plastic wall thickness must be uniform to avoid missing glue and sharp corners to prevent stress concentration.

胶袋薄可做到单面2.5丝厚，市面上一般薄为3丝，大大降低了产品成本。2.5丝的PE封口袋，密封性能仍然很好。使用方便(只需装入产品锁上骨条即可)。可定制2.5丝到15丝间任意厚度，厚的PE封口袋，两侧牢固，不易爆边，PE胶袋的袋子透明度好，可重复使用。PE封口袋可印刷打透气孔(防胀气),胶袋口可做成红色(红边)或白色(白边)。数量准，不少数，不少厚度。一百个一包，包装整齐。

The thin plastic bag can achieve a thickness of 2.5 threads on one side, which is generally 3 threads on the market, greatly reducing product costs. The 2.5 wire PE sealing pocket still has good sealing performance. Easy to use (just insert the product lock bone strip). Customizable PE sealed pockets of any thickness between 2.5 and 15 threads, with sturdy sides and non explosive edges. The transparency of the PE bag is good and can be reused. The PE sealing pocket can be printed with air holes (anti inflation), and the plastic bag mouth can be made into red (red edge) or white (white edge). The quantity is accurate, not a few, and there are many thicknesses. Pack one hundred in neat packaging.