In-mold label (IML for short) is a type of label. It refers to the label printed and die-cut in advance in an open mold. During the molding process of plastic products, the label and resin are melted into a whole.
In recent years, the application of in-mold labels has become more and more widespread: used in food packaging containers, such as dairy products, ice cream, and condiments; used in petrochemical product containers, such as lubricants; and used in daily chemical containers, such as shampoo, shower gel Etc .; and used in washing containers, such as laundry detergent, softener, toilet cleaner, glass cleaner, etc.
In-mold labels have excellent performance in terms of appearance, production efficiency, anti-counterfeiting, waterproofing, anti-dropping, etc., which has also become the main reason for various merchants to adopt this process.
Compared with the traditional labeling method, the in-mold labeling method has the advantages of improving production efficiency, reducing downstream equipment and reducing labor. Because the in-mold labeling and container molding are completed at the same time, the label and container are integrated after molding, and the complexity of the in-mold labeling molding process has also increased accordingly. If the molding process of the in-mold labeling process cannot be carried out smoothly and steadily, the molding plant not only cannot increase production efficiency, but also increases production costs.
The large part of the reason for the increased cost of using in-mold labels is that when the molding plant starts to quantify the production of a product, the defect rate of the product increases significantly compared with the small trial production. The main reasons for the increase in the defect rate are: 1, bubbles: 2, crooked mark, 3, re-mark. 4. The label loses ink after forming. Whether these problems can be solved is the key to reducing costs.
The above problems can be eliminated on the one hand by changing the production conditions of the molding process and reducing the production speed, on the other hand, it is related to the size and shape of the container label. Changing production conditions or speed will increase production costs. So we hope that the molding process does not make too many modifications or settings on the molding machine. Only in this way can the in-mold labeling container achieve the effect of reducing costs. Therefore, how to choose different uses, different raw materials, different processes, different manufacturers of in-mold label paper. The key to reducing the cost of in-mold labeling containers is that they can be produced in large quantities during the previous processing and forming processes such as printing. Below, we briefly discuss the importance of choosing different label papers for the production of in-mold label containers.
At present, the commonly used substrates on the market generally include PP, Ah, PP / PE composite, PP plus coating, etc. There are also BOPP and paper substrates, which are still relatively rare in the market. From the perspective of the characteristics of the substrate. PE is the softest. PPjPE is second, PP has the most stiffness. The materials mentioned above, except for paper, have certain waterproof, oil-proof, acid-base resistance. Labels of different materials have a certain price difference, because the label accounts for a small proportion of the cost of the container. The price difference of the label raw material itself will not significantly affect the cost of the container. Many molding factories understand the label price. It is generally used to the materials used for the first time. When considering the use of new materials for labels, it is easy to make a single comparison in terms of price, which affects the reasonable choice of label paper. Various in-mold labeling papers are very unique, and the aspects to be considered when choosing label paper: 1. Container size (size of label area), 2. Container shape, 3. Molding speed and adhesion: 4. For the printing effect of the label and the requirements of the flatness of the label after forming, etc.
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