软包装复合袋的质检方法介绍

Writer： admin Time：2023-11-23 15:09 Browse：℃

　　With the wide application of flexible packaging composite bags, packaging companies have higher and higher requirements for the quality of flexible packaging composite bags, so the quality inspection of flexible packaging composite bags is more important, so what about the quality of composite bags?

　　随着软包装复合袋的广泛应用，包装企业对软包装复合袋的质量要求越来越高，因此软包装复合袋的质量检测就显得尤为重要，那么复合袋的质量呢?

　　Two detection methods for composite bags:

　　复合袋的两种检测方法：

　　1. Sealing tightness There are some slender seams at the seal, and slight neglect in visual inspection will bury the danger of food leakage in the future, so it is necessary to check the sealing tightness of the composite bag. The commonly used method is: spray a surface active agent with dye into the seal, and check whether it penetrates or not. If the color of the dye passes through the seal, it means that the sealing function is not good, and on the contrary, it means that it meets the requirements of sealing quality. In actual work, we often use a smooth, burr-free small iron ruler with a length of 20cm, a width of 5cm and a thickness of 0.8mm to push the seal tightly. If there is a drop, perforation, etc., it means that the sealing performance is poor; if the seal still adheres to the proper sealing size, it means that the sealing performance is good. The factors that lead to the poor sealing performance are: the pressure of the sealing knife is not good or uneven, which can be solved by adjusting the spring pressure of the sealing knife; the low temperature will also make the sealing of the composite bag worse. We noticed that when the total thickness of the composite material exceeds 80 μm, the problem of poor adhesion is easy to occur during bag making processing, especially the structure of BOPP/OPP. To ensure the tightness of the product, there is a uniform and stable sealing pressure and a suitable temperature.

　　1、密封密封性 密封处有一些细长的接缝，目视检查稍有疏忽，以后就会埋下食物泄漏的危险，因此需要检查复合袋的密封密封性。常用的方法是：将带有染料的表面活性剂喷入密封件中，并检查其是否渗透。如果染料的颜色通过封口，说明封口功能不好，反之则说明符合封口质量的要求。在实际工作中，我们经常使用长20cm、宽5cm、厚0.8mm的光滑、无毛刺的小铁尺将密封件压紧。如果出现跌落、穿孔等现象，说明密封性能差;如果密封件仍然坚持适当的密封尺寸，则说明密封性能良好。导致封口性能差的因素有：封刀压力不好或不均匀，可以通过调节封口刀的弹簧压力来解决;低温也会使复合袋的密封性变差。我们注意到，当复合材料的总厚度超过80μm时，在制袋加工过程中容易出现附着力差的问题，尤其是BOPP/OPP的结构。为保证产品的密封性，有均匀稳定的密封压力和合适的温度。

　　2. Appearance visual Appearance visual inspection includes items such as the inspection of the flatness and transparency of the composite bag. It is mainly used to check whether there are obvious scratches and pinholes on the surface of the composite bag, and there is wu pollution at the seal. Our company has a complete set of appearance inspection methods, the details are as follows.

　　2、外观视觉 外观外观检查包括对复合袋的平整度、透明度等项目的检查。主要用于检查复合袋表面是否有明显的划痕和针孔，封口处有无无污染。我公司拥有一整套完整的外观检测方法，具体如下。

　　(1) Place the composite bag in your hand, sway it gently at the 40W fluorescent lamp, and through the reflected light on the surface of the composite bag, you can clearly find out whether the composite bag has scratches or marks on the surface, which is often called "bag surface drawing" in the industry. . If the wire drawing is severe, the fault location should be found according to the actual situation, and the impact should be reduced to a low point to ensure the quality of the product. Most of the wire drawing scenes we found through investigation are caused by the uncleanness of the guide rollers drawn by the bag making machine, so we must ensure that the guide rollers are clean. In addition, the non-rolling of the guide roller will also cause the drawing problem of the composite bag. The factor that the guide roller does not roll is mostly caused by the lack of oil in the bearing, so excellent smoothness is the basic condition for the bearing to roll.

　　(1)将复合袋放在手中，在40W日光灯下轻轻摇晃，通过复合袋表面的反射光，可以清楚地发现复合袋表面是否有划痕或痕迹，这在业内通常被称为“袋面拉丝”。.如果拉丝严重，应根据实际情况找到故障位置，并将冲击降低到低点，以保证产品的质量。我们通过调查发现的拉丝现场，大部分都是由于制袋机拉制的导辊不干净造成的，所以一定要保证导辊的清洁。此外，导辊的不滚动也会造成复合袋的拉拔问题。导辊不滚动的因素主要是由于轴承内缺油造成的，因此优良的光滑度是轴承滚动的基本条件。

　　(2) Check the flatness of the composite bag. The detailed method is: take several samples of the product bag for "air-to-ground" drop, let it touch the ground naturally (the landing place should be clean), and investigate the condition of the composite bag after it touches the ground. If the composite bag is bent, warped outwards or inwardly arched when it hits the ground, it means that the flatness of the composite bag is poor; otherwise, it means that the flatness is good. The factors that cause the difference in flatness are generally as follows: the bag making temperature is too high, the stress stiffness of the inner layer of the composite bag has been damaged; the structural composition is unreasonable; the thickness of the material itself is unequal. We noticed that when the total thickness of the composite materials of PET/PE and BOPP/PET/PE structures does not exceed 80 μm, the flatness is likely to deteriorate.

　　(2)检查复合袋的平整度。具体方法是：对产品袋进行“空对地”跌落取几个样品，让它自然接触地面(着陆处要干净)，并调查复合袋接触地面后的状况。如果复合袋在着地时弯曲、向外翘曲或向内拱起，则说明复合袋的平整度较差;否则，说明平整度好。造成平整度差异的因素一般有以下几种：制袋温度过高，复合袋内层应力刚度已损坏;结构组成不合理;材料本身的厚度是不相等的。我们注意到，当PET/PE和BOPP/PET/PE结构的复合材料总厚度不超过80 μm时，平整度可能会变差。

　　(3) The visual inspection of appearance also includes the inspection of transparency. Transparency is particularly important for some products because there is no pattern in a large area. The way to check the transparency is: take a product bag and check it through the indoor indirect light source. If there are "pockmarks", "rings", "fog" and other phenomena in the blank, it means that the transparency is poor, otherwise it means that the transparency is good. . There are many factors that cause poor transparency. For example, when compounding, because the color of the compound glue itself is yellowish or reddish, when it is transferred to the compound bag, a corresponding color shift will occur, which will affect its transparency; if the material itself has poor transparency , there is "fog", which will also affect its transparency, so when the materials are put into the warehouse, the quality should be strictly controlled, so that the unqualified raw materials will not be put into the warehouse. In addition, the transparency of different composite raw materials is also different. For example, the transparency of cast CPP is much higher than that of blow-molded co-extruded CPP.

　　(3)外观的目视检查还包括透明度的检查。透明度对于某些产品尤为重要，因为大面积没有图案。检查透明度的方法是：拿一个产品袋，通过室内间接光源检查。如果空白处有“麻点”、“环”、“雾”等现象，说明透明度差，否则说明透明度好。.导致透明度差的因素有很多。例如，复合时，由于复合胶本身的颜色偏黄或偏红，当它转移到复合袋中时，会发生相应的颜色偏移，从而影响其透明度;如果材料本身的透明度较差，就会出现“雾气”，这也会影响其透明度，因此在物料入库时，应严格控制质量，以免不合格的原材料入库。此外，不同复合原料的透明度也不同。例如，浇注CPP的透明度远高于吹塑共挤CPP。