1、复合膜的抗张强度

1. Tensile strength of composite membrane

 

假如复合膜抗张强度过低，无法考虑双层复合材料的规定，目力不可以尽快分散化，，那麼在着陆全过程中会造成破袋状况。除此之外，复合真空包装袋在高温享制袋

 

If the tensile strength of the composite membrane is too low to consider the provisions of double-layer composite materials, and the eyesight cannot be dispersed as soon as possible, 

 

then the bag will be broken during the whole landing process. In addition, composite vacuum packaging bags are made at high temperature

 

里，因为一些黏合剂耐温性差，尤其是在一些繁杂构造中，在高温烹制中，也会造成密封性边破裂、复合膜脱层状况

 

In, because some adhesives have poor temperature resistance, especially in some complex structures, during high-temperature cooking, it will also cause sealing edge cracking and 

 

composite membrane delamination

 

2、在制作包装袋加工工艺层面

 

2. On the processing technology level of making packaging bags

 

制作包装华温度过高，造成执封材料特性降低，导致破袋，制作包装袋工作压力过大，执封外的执封材料被格压，密封性外的执封材料降低，包装袋落下来时包装贷

 

The temperature of the packaging material is too high, resulting in the reduction of the characteristics of the sealing material, leading to the breakage of the bag. The working pressure 

 

of the packaging bag is too high, the sealing material outside the sealing is grid pressed, the sealing material outside the sealing property is reduced, and the packaging is damaged 

 

when the packaging bag falls

 

型开。袋子的执封过度锐利，或是有机械设备机，会毁坏袋子的执封边沿，导致华子捐坏的状况

 

Type open. If the bag is too sharp or there are mechanical equipment, the edge of the bag will be damaged, resulting in the bad condition of huazi donation

 

3、材料层面

 

3. Material level

 

复合真空包,装贷材料务必有充足的薄厚，薄厚不足，会导致复合膜的抗压强度不够，并导致袋子粉碎的难题:高度重视再造材料中的材料，从各个领域都是降低再造

 

The composite vacuum bag and packing material must have sufficient thickness. Insufficient thickness will lead to insufficient compressive strength of the composite film and the problem 

 

of bag crushing: attach great importance to the materials in the recycled materials, and reduce the recycling in all fields

 

材料，再造材料过多，复合膜抗压强度不够，造成袋子粉碎。在聚乙烯薄膜的生产制造全过程中，添加LLDPE和mPE以提升高压聚乙烯的抗压强度和柔韧度，进而降低破袋，假如在超低温冷藏自然环境中应用的包装

 

务必是耐寒的包装材料，才可以生产制造复合膜，不然会造成 复合膜在超低温冷藏自然环境中脆裂

 

There are too many materials and reconstituted materials, and the compressive strength of the composite membrane is not enough, resulting in the crushing of the bag. In the whole 

 

production process of polyethylene film, LLDPE and MPE are added to improve the compressive strength and flexibility of high-pressure polyethylene, so as to reduce bag breakage. If the 

 

packaging used in the ultra-low temperature refrigerated natural environment must be cold resistant packaging materials, the composite film can be produced and manufactured, otherwise 

 

the composite film will be brittle in the ultra-low temperature refrigerated natural environment

 

4、其他层面

 

4. Other levels

 

包装一些重物品或粉末状类，如盐、洗洁剂等，添充该类物件后，热封前要排出来袋内气体，减少包装袋的壁力，立即对固态化学物质释放力，降低袋的损坏。

 

Pack some heavy or powdered items, such as salt, detergent, etc. after filling these items, the gas in the bag should be discharged before heat sealing, so as to reduce the wall force of 

 

the packaging bag, release the force of solid chemicals immediately, and reduce the damage of the bag.

 

5，热封层材料的种类，厚度以及质量对热封强度有决定性的影响。

 

5. The type, thickness and quality of heat seal materials have a decisive impact on the heat seal strength.

 

一般复合包装常用的热封材料有CPE、CPPEVA、热熔胶以及其它一些离子型树脂共挤或共混改性薄膜。热封层材料的厚度一般在20~80um之间，特殊情况下也有

 

Commonly used heat sealing materials for composite packaging include CPE, cppeva, hot melt adhesive and some other ionic resin coextrusion or blending modified films. The thickness of 

 

the heat sealing layer material is generally between 20 and 80um, and there are also special cases

 

达100~200um的，同一种执封材料，其执封强度随执封度度的增大而增大，蒸者袋的执封强度一般要求达40~50牛顿，因此，其执封材料度度应在60~80um以上。6、热封温度对热封强度的影响较为直接。

 

For the same sealing material up to 100~200um, its sealing strength increases with the increase of sealing degree. The sealing strength of steamer bag is generally required to reach 

 

40~50 Newton. Therefore, the sealing material degree should be above 60~80um. 6. The influence of heat sealing temperature on heat sealing strength is relatively direct.

 

各种材料的熔融温度的高低，直接决定复合袋的zui低热封温度。生产过程中，由于热封压力，制袋速度以及复合基材的厚度等多方面影响，实际采用的热封温度往往

 

The melting temperature of various materials directly determines the Zui low heat sealing temperature of composite bags. In the production process, due to the influence of heat sealing 

 

pressure, bag making speed and the thickness of composite substrate, the actual heat sealing temperature is often

 

要高于热封材料的熔融温度。热封的压力越小，要求热封温度越高;机速越快，复合膜的面层材料越厚，要求的热封温度也越高。

 

It should be higher than the melting temperature of the heat sealing material. The lower the pressure of heat sealing, the higher the temperature of heat sealing is required; The faster 

 

the machine speed is, the thicker the surface material of the composite film is, and the higher the required heat sealing temperature is.

 

热封温度若低于热封材料的软化点，则无论怎样加大压力或延长热封时间，均不可能使热封层zhen正封合。但是若热封温度过高，又极易损伤焊边处的热封材料熔融

 

If the heat sealing temperature is lower than the softening point of the heat sealing material, no matter how to increase the pressure or extend the heat sealing time, it is impossible 

 

to make the heat sealing layer Zhen positive sealing. However, if the heat sealing temperature is too high, it is very easy to damage the melting of the heat sealing material at the 

 

welding edge

 

挤出，产生“根切”现象，大大降低封口的热封强度和袋子的耐冲击性能。

 

Extrusion produces "undercut" phenomenon, which greatly reduces the heat sealing strength of the seal and the impact resistance of the bag.

 

7、要达到理想的热封强度，一定的压力必不可少。

 

7. To achieve the ideal heat sealing strength, a certain pressure is essential.

 

对干轻薄包装袋，热封压力少要达到2k/cm22，而随着复合膜总厚度的增加而相应提高。若执封压力不足，两层薄膜之间难以达到zhen正地熔合，致合局部热

 

For dry, light and thin packaging bags, the heat sealing pressure should reach at least 2k/cm22, which increases with the increase of the total thickness of the composite film. If the 

 

sealing pressure is insufficient, it is difficult to achieve positive fusion between the two films, causing local heat

 

封不好，或者难以赶尽夹在惶缝中间的气泡，造成虎煜;

Poor sealing, or it is difficult to catch up with the bubbles caught in the middle of the panic seam, resulting in tiger Yu;

 

当然，执封压力也不是越大越好，应以不捐伤悍边为宣，因为在较高的执封温度时，悍边的执封材料已外干半熔融状态，大大的压力易格走部分执封料，使悍缝边绿

 

Of course, the greater the sealing pressure is, the better. It should be declared not to damage the hard edge, because at a higher sealing temperature, the sealing material of the hard edge has been dry and semi molten, and the large pressure changes part of the sealing material to make the hard edge green

 

形成半切断状态，焊缝发脆，执封强度降低。

 

Forming a semi cut-off state, the weld is brittle and the sealing strength is reduced.

 

8、热封时间主要由制袋机的速度决定。

 

8. The heat sealing time is mainly determined by the speed of the bag making machine.

 

热封时间也是影响悍缝封合强度和外观的一个关键因素。相同的热封温度和压力，热封时间长，则热封层熔合更充分，结合更牢固，但热封时间太长，容易造成悍缝

 

Heat sealing time is also a key factor affecting the sealing strength and appearance of tough seams. With the same heat sealing temperature and pressure, if the heat sealing time is long, the heat sealing layer will be fused more fully and bonded more firmly, but if the heat sealing time is too long, it is easy to cause sharp cracks

 

起皱，影响外观。

 

Wrinkle, affecting the appearance.

 

9、热封后的焊缝若冷却不好，不但会影响焊缝的外观平整度，而且对热封强度有一定的影响。

 

9. If the weld after heat sealing is not cooled well, it will not only affect the appearance flatness of the weld, but also have a certain impact on the heat sealing strength.

 

冷却过程就是通过在一定的压力下，用较低的温度对刚刚熔融热封后的焊缝进行定形，应力集中的过程。因此，压力不够，冷却水循环不畅，循环量不够，水温太高，或冷却不及时都会致使冷却不良，热封边起翘，执封强度降低。

 

The cooling process is a process of eliminating stress concentration by shaping the weld just after melting and heat sealing with a lower temperature under a certain pressure. Therefore, insufficient pressure, poor cooling water circulation, insufficient circulation volume, too high water temperature, or untimely cooling will lead to poor cooling, warping of hot sealing edges, and reduced sealing strength.