濟(jì)南復(fù)合袋熱封不良的表現(xiàn)及其原因基本有以下幾種情況：

The performance and causes of poor heat sealing of Jinan composite bags are basically as follows:

1，熱封強(qiáng)度不良。導(dǎo)致該現(xiàn)象主要的原因有粘結(jié)劑固化不徹底或熱封溫度太低。優(yōu)化熟化工藝或適當(dāng)提高封刀溫度就可以改善這個(gè)問題。

1. The heat seal strength is poor. The main reason for this phenomenon is that the adhesive is not cured completely or the heat sealing temperature is too low. This problem can be improved by optimizing the curing process or properly increasing the sealing temperature.

2，熱封面脫層、卷曲。導(dǎo)致該現(xiàn)象主要的原因是粘結(jié)劑未固化。調(diào)整固化時(shí)間或調(diào)節(jié)固化劑含量就可以改善這個(gè)問題。

2. The hot cover is delaminated and curled. The main reason for this phenomenon is that the adhesive is not cured. This problem can be improved by adjusting the curing time or the content of curing agent.

3，開口性不好/內(nèi)層膜的開口性差。導(dǎo)致該現(xiàn)象的原因是開口劑太少，粘結(jié)料（改性劑）太多，薄膜表面有粘物或油膩。增加開口劑用量，調(diào)整改性劑用量，避免薄膜表面的二次污染等都可以改善這個(gè)問題。

3. Poor opening/poor opening of inner membrane. The reason for this phenomenon is that there are too few opening agents, too many binders (modifiers), and sticky or greasy substances on the film surface. This problem can be improved by increasing the amount of opening agent, adjusting the amount of modifier, and avoiding secondary pollution of the film surface.

此外對(duì)于常用的吹塑薄膜基材而言，其熱封性除受樹脂牌號(hào)影響外,還受擠出溫度、吹脹比和牽引比、冷凝線、使用的再生料等因素的影響。

In addition, for the commonly used blown film substrate, its heat sealing is not only affected by the resin grade, but also by the extrusion temperature, blowing expansion ratio and traction ratio, condensation line, recycled materials used and other factors.

吹脹膜的熱封性將隨擠出溫度的升高，氧化程度的升高而降低。

The heat sealing of the blown film will decrease with the increase of extrusion temperature and oxidation degree.

一定的吹脹比和牽引比有利于熱封強(qiáng)度的提高，但由于薄膜吹脹和牽引實(shí)際上是使進(jìn)入高彈態(tài)的分子產(chǎn)生定向，加快并促進(jìn)其結(jié)晶化，結(jié)果在使薄膜的定向強(qiáng)度提高的同時(shí)，卻使熱封性即熱封牢度減低了,因此，過大的吹脹比和牽引比是不合適的。

A certain blowing expansion ratio and traction ratio are beneficial to the improvement of the heat sealing strength, but because the blowing expansion and traction of the film actually make the molecules entering the high elastic state produce orientation, accelerate and promote their crystallization, the result is that while the directional strength of the film is improved, the heat sealing property, i.e. the heat sealing fastness, is reduced. Therefore, too large blowing expansion ratio and traction ratio are inappropriate.

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