軟包裝復合袋的質檢方法介紹

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?

　　隨著軟包裝復合袋的廣泛應用，包裝企業對軟包裝復合袋的質量要求越來越高，因此軟包裝復合袋的質量檢測就顯得尤為重要，那么復合袋的質量呢?

　　Two detection methods for composite bags:

　　復合袋的兩種檢測方法：

　　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 密封處有一些細長的接縫，目視檢查稍有疏忽，以后就會埋下食物泄漏的危險，因此需要檢查復合袋的密封密封性。常用的方法是：將帶有染料的表面活性劑噴入密封件中，并檢查其是否滲透。如果染料的顏色通過封口，說明封口功能不好，反之則說明符合封口質量的要求。在實際工作中，我們經常使用長20cm、寬5cm、厚0.8mm的光滑、無毛刺的小鐵尺將密封件壓緊。如果出現跌落、穿孔等現象，說明密封性能差;如果密封件仍然堅持適當的密封尺寸，則說明密封性能良好。導致封口性能差的因素有：封刀壓力不好或不均勻，可以通過調節封口刀的彈簧壓力來解決;低溫也會使復合袋的密封性變差。我們注意到，當復合材料的總厚度超過80μm時，在制袋加工過程中容易出現附著力差的問題，尤其是BOPP/OPP的結構。為保證產品的密封性，有均勻穩定的密封壓力和合適的溫度。

　　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、外觀視覺 外觀外觀檢查包括對復合袋的平整度、透明度等項目的檢查。主要用于檢查復合袋表面是否有明顯的劃痕和針孔，封口處有無無污染。我公司擁有一整套完整的外觀檢測方法，具體如下。

　　(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)將復合袋放在手中，在40W日光燈下輕輕搖晃，通過復合袋表面的反射光，可以清楚地發現復合袋表面是否有劃痕或痕跡，這在業內通常被稱為“袋面拉絲”。.如果拉絲嚴重，應根據實際情況找到故障位置，并將沖擊降低到低點，以保證產品的質量。我們通過調查發現的拉絲現場，大部分都是由于制袋機拉制的導輥不干凈造成的，所以一定要保證導輥的清潔。此外，導輥的不滾動也會造成復合袋的拉拔問題。導輥不滾動的因素主要是由于軸承內缺油造成的，因此優良的光滑度是軸承滾動的基本條件。

　　(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)檢查復合袋的平整度。具體方法是：對產品袋進行“空對地”跌落取幾個樣品，讓它自然接觸地面(著陸處要干凈)，并調查復合袋接觸地面后的狀況。如果復合袋在著地時彎曲、向外翹曲或向內拱起，則說明復合袋的平整度較差;否則，說明平整度好。造成平整度差異的因素一般有以下幾種：制袋溫度過高，復合袋內層應力剛度已損壞;結構組成不合理;材料本身的厚度是不相等的。我們注意到，當PET/PE和BOPP/PET/PE結構的復合材料總厚度不超過80 μm時，平整度可能會變差。

　　(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)外觀的目視檢查還包括透明度的檢查。透明度對于某些產品尤為重要，因為大面積沒有圖案。檢查透明度的方法是：拿一個產品袋，通過室內間接光源檢查。如果空白處有“麻點”、“環”、“霧”等現象，說明透明度差，否則說明透明度好。.導致透明度差的因素有很多。例如，復合時，由于復合膠本身的顏色偏黃或偏紅，當它轉移到復合袋中時，會發生相應的顏色偏移，從而影響其透明度;如果材料本身的透明度較差，就會出現“霧氣”，這也會影響其透明度，因此在物料入庫時，應嚴格控制質量，以免不合格的原材料入庫。此外，不同復合原料的透明度也不同。例如，澆注CPP的透明度遠高于吹塑共擠CPP。