濟南復合袋熱封不良的表現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，熱封強度不良。導致該現象主要的原因有粘結劑固化不徹底或熱封溫度太低。優化熟化工藝或適當提高封刀溫度就可以改善這個問題。

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。導致該現象主要的原因是粘結劑未固化。調整固化時間或調節固化劑含量就可以改善這個問題。

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/內層膜的開口性差。導致該現象的原因是開口劑太少，粘結料（改性劑）太多，薄膜表面有粘物或油膩。增加開口劑用量，調整改性劑用量，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.

此外對于常用的吹塑薄膜基材而言，其熱封性除受樹脂牌號影響外,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度的提高，但由于薄膜吹脹和牽引實際上是使進入高彈態的分子產生定向，加快并促進其結晶化，結果在使薄膜的定向強度提高的同時，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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The performance and reasons of poor heat sealing of composite bags have been solved for you, and more matters will come to our website http://www.skmok.com Ask about it!