復(fù)合袋熱封故障頻發(fā)是何原因？為了更好的方便大家解決濟(jì)南復(fù)合袋此類問題，小編在這里為您分析一番：

What is the reason for the frequent failure of composite bag heat seal? In order to better facilitate you to solve the problems of Jinan composite bags, Xiao Bian is here to analyze for you:

要達(dá)到理想的熱封強(qiáng)度，熱封壓力必不可少。

To achieve the ideal heat seal strength, the heat seal pressure is indispensable.

對(duì)于輕薄包裝袋、熱封壓力少要達(dá)到2kg/cm2，而且隨著復(fù)合膜總厚度的增加而相應(yīng)提高；若熱封壓力不足，兩層薄膜之間難以達(dá)到真正的熔合，導(dǎo)致局部熱封不好或難以夾在焊縫中間的氣泡，造成虛焊。

For light and thin packaging bags, the heat sealing pressure should reach at least 2kg/cm2, and it will increase with the increase of the total thickness of the composite film; If the heat seal pressure is insufficient, it is difficult to achieve true fusion between the two layers of film, resulting in poor local heat seal or difficult to eliminate bubbles sandwiched in the middle of the weld, resulting in faulty welding.

但熱封壓力并非越大越好，應(yīng)以不損傷焊邊為宜，因?yàn)樵谳^高的熱封溫度時(shí)，焊邊的熱封材料已處于半熔融狀態(tài)，太大的壓力易擠走部分熱封料，使焊縫邊緣形成半切斷狀態(tài)。焊縫發(fā)脆，熱封強(qiáng)度降低。所以壓力的調(diào)節(jié)非常關(guān)鍵。

However, the higher the heat sealing pressure is, the better. It is better not to damage the weld edge, because at a higher heat sealing temperature, the heat sealing material of the weld edge is already in a semi-molten state, and too much pressure is easy to squeeze out part of the heat sealing material, making the weld edge form a semi-cut state. The weld is brittle and the heat sealing strength is reduced. So the adjustment of pressure is very important.

熱封時(shí)間主要由制袋機(jī)的速度決定。

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

速度快，熱封時(shí)間就短；速度慢，熱封時(shí)間就長(zhǎng)。熱封時(shí)間也是影響焊縫封合強(qiáng)度和外觀的一個(gè)關(guān)鍵因素。相同的熱封溫度和壓力下，熱封時(shí)間長(zhǎng)，則熱封層熔合更充分，結(jié)合更牢固；但熱封時(shí)間太長(zhǎng)，容易造成焊縫起皺變形，影響平整度和外觀。

Fast speed, short heat sealing time; Slow speed, long heat sealing time. The heat sealing time is also a key factor affecting the sealing strength and appearance of the weld. At the same heat sealing temperature and pressure, if the heat sealing time is long, the heat sealing layer will fuse more fully and combine more firmly; However, if the heat sealing time is too long, it is easy to cause wrinkling and deformation of the weld and affect the flatness and appearance.

熱封后的焊縫若冷卻不好，不但會(huì)影響焊疑的外觀平整度，而且對(duì)熱封強(qiáng)度有一定的影響，冷卻過程就是通過在一定的壓力下，用較低的溫度對(duì)剛?cè)廴跓岱夂蟮暮缚p進(jìn)行定形。因此，壓力不夠，冷卻和循環(huán)不暢，循環(huán)量不夠，水溫太高或冷卻不及時(shí)，都會(huì)致使冷卻不良，熱封強(qiáng)度降低。

If the welding seam after heat sealing is not cooled well, it will not only affect the appearance flatness of the welding suspect, but also have a certain impact on the heat sealing strength. The cooling process is to shape the welding seam just after heat sealing at a lower temperature under a certain pressure. Therefore, insufficient pressure, poor cooling and circulation, insufficient circulation, too high water temperature or untimely cooling will lead to poor cooling and reduced heat seal strength.

復(fù)合袋內(nèi)容物的影響。

The impact of the contents of the composite bag.

有些產(chǎn)品為粉末裝，在進(jìn)行灌裝時(shí)易沾污封口。例如，當(dāng)采用LDPE材料作為內(nèi)層料時(shí)，發(fā)現(xiàn)封口處易破裂。這是因?yàn)長(zhǎng)DPE對(duì)夾雜物的熱封性就不是很好，這時(shí)就要更換內(nèi)層膜材料或增加材料的厚度就可以提高熱封強(qiáng)度。

Some products are powder packed, which is easy to stain and seal when filling. For example, when LDPE material is used as the inner layer material, it is found that the seal is easy to crack. This is because LDPE is not very good at heat sealing of inclusions. At this time, it is necessary to replace the inner film material or increase the thickness of the material to improve the heat sealing strength.

復(fù)合材料添加劑的影響。

Effect of composite additives.

在復(fù)合聚乙烯薄膜過程中，聚乙烯經(jīng)熱壓輥擠壓后有析出的現(xiàn)象，一層白白的象碎粉白狀，這種現(xiàn)象是聚乙烯在生產(chǎn)過程中，加入一定量的潤(rùn)滑劑，是一些低熔點(diǎn)的蠟，容易析出薄膜表面。這層低熔點(diǎn)的蠟析出后直接的危害就是大大地削弱了復(fù)合強(qiáng)度，也大大地減弱了熱封強(qiáng)度，特別在封邊位置，造成易開口、離層。

In the process of composite polyethylene film, the polyethylene will precipitate after being extruded by the hot pressing roller, a layer of white is like broken powder. This phenomenon is that a certain amount of lubricant is added to the polyethylene during the production process, which is some low melting point wax, which is easy to precipitate to the film surface. The direct harm of this layer of low melting point wax after precipitation is that it greatly weakens the composite strength and also greatly weakens the heat sealing strength, especially at the edge sealing position, causing easy opening and delamination.

解決方法：

resolvent:

1)重新對(duì)聚乙烯進(jìn)行預(yù)處理，達(dá)到理想的表面張力；

1) The polyethylene is pretreated again to achieve ideal surface tension;

2)選擇合適的膠粘劑，以增強(qiáng)其復(fù)合牢度；

2) Select appropriate adhesive to enhance its composite fastness;

3)減低熟化溫度盡量不使物質(zhì)析出，從而增加復(fù)合牢度與熱封強(qiáng)度。

3) Reduce the curing temperature and try not to precipitate substances, so as to increase the composite fastness and heat sealing strength.

復(fù)合袋熱封故障頻發(fā)是何原因？以上就是問題的相關(guān)解答了，希望能夠幫助到您，您還有什么有關(guān)產(chǎn)品的問題或者需求，隨時(shí)都能來我們網(wǎng)站http://www.673338.com.cn做了解！

What is the reason for the frequent failure of composite bag heat seal? The above is the relevant answer to the question. I hope it can help you. If you have any questions or needs about the product, please come to our website at any time http://www.673338.com.cn Get to know!