食品真空包装设计及外真空包装材料原因

食品真空包装设计方面，如内容物的净含量或体积超过了所用软包装材料的承受范围，在运输或销售流通过程中，稍受外力，就会出现破袋、开裂问题。一般作为抽真空包装袋热封层，材料厚度不得低于50?m厚。

In terms of food vacuum packaging design, if the net content or volume of the content exceeds the tolerance range of the soft packaging materials used, slight external forces may cause bag breakage and cracking during transportation or sales circulation. Generally used as a heat sealing layer for vacuum packaging bags, the material thickness should not be less than 50? M thick.

食品真空包装材料的质量问题导致成品包装出现封口开裂问题，一般集中在以下几个方面：

The quality issues of food vacuum packaging materials have led to sealing and cracking problems in finished product packaging, which are generally concentrated in the following aspects:

食品包装的物理机械性能——如拉断力与断裂伸长率、抗穿刺强度、抗摆锤冲击性能、剥离强度等，可综合判断包装袋的韧性、耐穿刺性、抗冲击性等物理机械性能是否符合包装、储存堆码及运输过程的需求。(与内容物、包装袋的大小、运输路途及包装形式有关)

The physical and mechanical properties of food packaging, such as tensile strength and elongation at break, puncture strength, pendulum impact resistance, peel strength, etc., can comprehensively determine whether the physical and mechanical properties of packaging bags, such as toughness, puncture resistance, and impact resistance, meet the requirements of packaging, storage, stacking, and transportation processes. (Related to the content, size of packaging bags, transportation route, and packaging form)

食品包装的密封性一一如爆破压力测试，可以确定发生破袋的位置和机械强度薄弱的部位。如热封强度测试可判断热封强度是否满足食品内容物的要求，并确定热封不良的部位以及热封效果的均匀度。例如鸡爪真空包装产生破损是因为鸡爪被切分的时候，有些碎爪的骨头被切的很尖，再加上煮沸的时候，肉皮收缩，所以骨头就裸露出来，在运输的过程中容易将袋子扎破。因此，包装袋的耐穿刺性应做为包装材料组合的考虑。

The sealing of food packaging, such as burst pressure testing, can determine the location of bag breakage and the areas with weak mechanical strength. The heat sealing strength test can determine whether the heat sealing strength meets the requirements of food content, and determine the areas of poor heat sealing and the uniformity of the heat sealing effect. For example, the damage caused by vacuum packaging of chicken feet is because when the chicken feet are cut, some of the broken bones of the claws are cut very sharply, and when boiled, the skin shrinks, so the bones are exposed, making it easy to puncture the bag during transportation. Therefore, the puncture resistance of packaging bags should be a key consideration for packaging material combinations.

通过泄漏与密封强度测试仪不仅能够检测软包装袋的zui大破裂力，还能通过设定施加的压力来测试包装袋的破裂时间，可以根据测试数据设计堆放结构，进一步调整热封工艺的参数以改善包装效果，或者根据软包装袋破裂的位置对包装结构上存在的问题进行分析。

The leakage and sealing strength tester can not only detect the maximum rupture force of flexible packaging bags, but also test the rupture time of packaging bags by setting the applied pressure. Based on the test data, the stacking structure can be designed, and the parameters of the heat sealing process can be further adjusted to improve packaging effectiveness. Alternatively, problems in the packaging structure can be analyzed based on the location of the rupture of the flexible packaging bag.

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