1、復(fù)合膜的抗張強(qiáng)度

1. Tensile strength of composite membrane

 

假如復(fù)合膜抗張強(qiáng)度過低，無法考慮雙層復(fù)合材料的規(guī)定，目力不可以盡快分散化，，那麼在著陸全過程中會造成破袋狀況。除此之外，復(fù)合真空包裝袋在高溫享制袋

 

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，因為一些黏合劑耐溫性差，尤其是在一些繁雜構(gòu)造中，在高溫烹制中，也會造成密封性邊破裂、復(fù)合膜脫層狀況

 

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、在制作包裝袋加工工藝層面

 

2. On the processing technology level of making packaging bags

 

制作包裝華溫度過高，造成執(zhí)封材料特性降低，導(dǎo)致破袋，制作包裝袋工作壓力過大，執(zhí)封外的執(zhí)封材料被格壓，密封性外的執(zhí)封材料降低，包裝袋落下來時包裝貸

 

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

 

型開。袋子的執(zhí)封過度銳利，或是有機(jī)械設(shè)備機(jī)，會毀壞袋子的執(zhí)封邊沿，導(dǎo)致華子捐壞的狀況

 

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、材料層面

 

3. Material level

 

復(fù)合真空包,裝貸材料務(wù)必有充足的薄厚，薄厚不足，會導(dǎo)致復(fù)合膜的抗壓強(qiáng)度不夠，并導(dǎo)致袋子粉碎的難題:高度重視再造材料中的材料，從各個領(lǐng)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，再造材料過多，復(fù)合膜抗壓強(qiáng)度不夠，造成袋子粉碎。在聚乙烯薄膜的生產(chǎn)制造全過程中，添加LLDPE和mPE以提升高壓聚乙烯的抗壓強(qiáng)度和柔韌度，進(jìn)而降低破袋，假如在超低溫冷藏自然環(huán)境中應(yīng)用的包裝

 

務(wù)必是耐寒的包裝材料，才可以生產(chǎn)制造復(fù)合膜，不然會造成 復(fù)合膜在超低溫冷藏自然環(huán)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、其他層面

 

4. Other levels

 

包裝一些重物品或粉末狀類，如鹽、洗潔劑等，添充該類物件后，熱封前要排出來袋內(nèi)氣體，減少包裝袋的壁力，立即對固態(tài)化學(xué)物質(zhì)釋放力，降低袋的損壞。

 

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，熱封層材料的種類，厚度以及質(zhì)量對熱封強(qiáng)度有決定性的影響。

 

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

 

一般復(fù)合包裝常用的熱封材料有CPE、CPPEVA、熱熔膠以及其它一些離子型樹脂共擠或共混改性薄膜。熱封層材料的厚度一般在20~80um之間，特殊情況下也有

 

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

 

達(dá)100~200um的，同一種執(zhí)封材料，其執(zhí)封強(qiáng)度隨執(zhí)封度度的增大而增大，蒸者袋的執(zhí)封強(qiáng)度一般要求達(dá)40~50牛頓，因此，其執(zhí)封材料度度應(yīng)在60~80um以上。6、熱封溫度對熱封強(qiáng)度的影響較為直接。

 

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.

 

各種材料的熔融溫度的高低，直接決定復(fù)合袋的zui低熱封溫度。生產(chǎn)過程中，由于熱封壓力，制袋速度以及復(fù)合基材的厚度等多方面影響，實際采用的熱封溫度往往

 

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

 

要高于熱封材料的熔融溫度。熱封的壓力越小，要求熱封溫度越高;機(jī)速越快，復(fù)合膜的面層材料越厚，要求的熱封溫度也越高。

 

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.

 

熱封溫度若低于熱封材料的軟化點，則無論怎樣加大壓力或延長熱封時間，均不可能使熱封層zhen正封合。但是若熱封溫度過高，又極易損傷焊邊處的熱封材料熔融

 

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

 

擠出，產(chǎn)生“根切”現(xiàn)象，大大降低封口的熱封強(qiáng)度和袋子的耐沖擊性能。

 

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

 

7、要達(dá)到理想的熱封強(qiáng)度，一定的壓力必不可少。

 

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

 

對干輕薄包裝袋，熱封壓力少要達(dá)到2k/cm22，而隨著復(fù)合膜總厚度的增加而相應(yīng)提高。若執(zhí)封壓力不足，兩層薄膜之間難以達(dá)到zhen正地熔合，致合局部熱

 

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，或者難以趕盡夾在惶縫中間的氣泡，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;

 

當(dāng)然，執(zhí)封壓力也不是越大越好，應(yīng)以不捐傷悍邊為宣，因為在較高的執(zhí)封溫度時，悍邊的執(zhí)封材料已外干半熔融狀態(tài)，大大的壓力易格走部分執(zhí)封料，使悍縫邊綠

 

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

 

形成半切斷狀態(tài)，焊縫發(fā)脆，執(zhí)封強(qiáng)度降低。

 

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

 

8、熱封時間主要由制袋機(jī)的速度決定。

 

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

 

熱封時間也是影響悍縫封合強(qiáng)度和外觀的一個關(guān)鍵因素。相同的熱封溫度和壓力，熱封時間長，則熱封層熔合更充分，結(jié)合更牢固，但熱封時間太長，容易造成悍縫

 

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

 

起皺，影響外觀。

 

Wrinkle, affecting the appearance.

 

9、熱封后的焊縫若冷卻不好，不但會影響焊縫的外觀平整度，而且對熱封強(qiáng)度有一定的影響。

 

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.

 

冷卻過程就是通過在一定的壓力下，用較低的溫度對剛剛?cè)廴跓岱夂蟮暮缚p進(jìn)行定形，應(yīng)力集中的過程。因此，壓力不夠，冷卻水循環(huán)不暢，循環(huán)量不夠，水溫太高，或冷卻不及時都會致使冷卻不良，熱封邊起翹，執(zhí)封強(qiáng)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.