Composite extrusion from the 1960s began to emerge so far has been 40 years of history, especially from the beginning of the 1980s, in Europe, America, Japan and South Korea, extruded composite has been in a stage of rapid development. At present, in the United States and Europe, extrusion compounding accounts for about 50% of flexible packaging , while in Japan and South Korea it has reached 70% . Extruded composite products cover almost all packaging fields; food, daily chemical products, beverages, medicines, protective films, protective film, and even aerospace products, etc., all of our products that use dry composite have been extruded abroad Compounded, dry-toothed toothpaste tubes, paper-plastic aluminum composite products, and aerospace products are also compounded by extrusion. Due to the in-depth research and continuous innovation of foreign countries in the extrusion of composite resins, processes, and equipment, extrusion Outcoming is moving to a higher level, becoming the mainstream of flexible packaging development.
Â Â Â Compared with advanced countries, the development level of extrusion compounding in China is very large (domestic equipment production speeds are mostly at 100m / min and a width of 1250mm ; while equipment production speeds in the United States can reach up to 800m / min and a width of 1650mm ). At present, China's extruded composite products account for about 25% of flexible packaging , and most of them are low-end product packaging. The tortuous development process of extrusion compounding in China is mainly determined by our national conditions:
1. Trouble with capital issues: China's flexible packaging companies are generally relatively small in scale and have limited funds. The performance of the domestic extruding laminating machine is insufficient, and it can only be imported, and the price of tens of millions of yuan for the imported machine is unaffordable, so it can only give up the extruding laminating and switch to buying a dry laminating machine; Â Â
2. Insufficient performance of extruded composite products: China's packaging has long emphasized stiffness and strength. Extruded composite has obvious disadvantages in this respect. In the 1990s , the peel strength of the extruded composite was generally about 0.6N / 15mm . Only pure LDPE extrusion was used as the inner heat seal layer. The heat seal strength and tensile strength were both low, and the film was relatively soft. In recent years, with the innovation of the extrusion compounding process, the peel strength has been improved, and the heat seal layer material has also been changed. The heat seal strength has been greatly improved, and the tensile strength has also been improved. In addition to stiffness, other aspects have been Basically reach the level of dry compound.
3. Although there are serious defects of solvent residues in dry-type compounding, which are also stipulated in China's national standards, their indicators are far from foreign requirements, and only some large enterprises can detect and control solvent residues. Small and medium-sized enterprises are not tested at all. In fact, these harmful and toxic substances are extremely harmful to the human body, especially food packaging, a large part of which are children's food. Children's long-term consumption of foods containing toxic and harmful substances is extremely harmful to their health. At present, people in the industry have begun to pay attention to these problems. Extrusion compounding has received more and more attention because it has no solvent residue and good hygienic performance.
4. Extrusion composite materials: China's petrochemical enterprises have insufficient production technology and cannot produce special extrusion composite resins. Thermal bonding resins such as EAA , EEA , EMA, etc. cannot be manufactured, and PP resins for extrusion compounding have not been put into industrial production. Even the performance of commonly used LDPE resins is not very stable, and the gap between batches is large. In recent years, relevant petrochemical enterprises and scientific research units are also strengthening their research, and the problem of resin shortage is gradually being solved (currently the most important ones are imported, and there are many types of imported materials).
Changzhou Haorun Packaging Materials Co., Ltd. (referred to as "Changzhou Haorun Packaging") is located at No. 28-2 Guihua Road, Zhonglou District, Changzhou City, Jiangsu Province . It is a professional manufacturer of composite packaging bags, composite films, food packaging bags, aluminum foil bags, vacuum Bag manufacturers . Ho-Run package passed the ISO quality management system certification, QS certification and BRC certified, complete testing equipment and advanced laboratories, all provide a strong guarantee for high quality products.
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