Guangdong Huaping Hygiene Material Industrial Co., Ltd. os principais produtos incluem filme PE, filme respirável PE, filme perfurado PE, filme impresso multicolorido, filme laminado não tecido, filme holográfico anti-falsificação etc.
With the maturity of the primary processing technology of non-woven fabrics, more and more enterprises are turning their attention to the deep processing of non-woven fabrics, so as to increase the added value of products and the profits of enterprises as much as possible. In China, the application field of hot melt adhesive coating equipment has also been continuously expanded. The medical and sanitary material production sectors are the most widely used industries of this type of equipment. The rapid development of the automobile industry in China has also driven spare parts manufacturers to heat The demand for melt adhesive coating equipment, relevant data show that the domestic geotextile industry has also introduced the first hot melt adhesive production line so far not long ago.
As a mature and constantly developing process, the prospect of hot melt adhesive coating technology in the non-woven fabric deep processing industry will become better and better. Disposable medical products (such as surgical gowns, surgical sheets, drapes, gloves, shoes, hats, etc.), industrial protective products, and personal care products are mainly non-woven composite film products. The requirements are almost the same, namely waterproofness, breathability and comfort.
This article will introduce a new type of non-woven and film composite technology based on the analysis and comparison of several main process characteristics of the current medical and sanitary materials.
◆ Laminação: Esta técnica é o método mais utilizado pelas empresas nacionais
Features: The process is simple and mature, and the production speed is fast (about 100m/min).
Disadvantages: It is not allowed to make products that require ventilation; the hand feels hard and the comfort is poor; the requirements for non-woven fabrics are high. Non-woven fabrics with low grammage (below 18gsm) and low coating weight (below 15gsm) are not ideal for coating, because the unevenness of the surface of the roll makes the coating process prone to leaks.
◆Hot rolling: It is a standard process for manufacturing composite non-woven fabrics in two steps. Some domestic enterprises use this process for composite manufacturing of film and cloth. Features: ready-made equipment and technology can be used. Disadvantages: The composition of the film is PE, while the composition of the non-woven fabric is polypropylene. The melting points of the two are different, so that the temperature of the hot roll cannot be taken into account at the same time; the problem of heat capacity of the hot roll makes different production speeds at the same temperature lead to the uniformity of the composite strength of the product. Poor; the processing accuracy of the hot embossed roll is also a factor affecting product quality; the air loss rate of the hot rolling method for the breathable film material is high (between 30-40%); the production speed is slow.
◆Powder compounding: It is a method of evenly spreading hot melt adhesive powder on the non-woven fabric or film, and then compounding by heat.
Características: O rolo de pressão térmica usa rolo elástico e rolo liso para causar pouco dano ao material.
Desvantagens: velocidade de produção lenta e baixa eficiência de produção; a distribuição uniforme do pó adesivo hot melt é a chave para a qualidade do produto, mas a higroscopicidade do pó adesivo hot melt torna a distribuição uniforme bastante difícil, e a quantidade de distribuição não é boa Controle; a temperatura de fusão do pó adesivo hot-melt é alta, e a temperatura de fusão do filme respirável é baixa. O pó adesivo hot-melt não pode ser completamente derretido durante a composição, resultando em resistência de casca insuficiente e baixa planicidade da superfície do filme composto.
◆Hot melt adhesive breathable coating composite:
Features: Fast production speed, low air loss rate of breathable membrane material (between 20-30%).
Disadvantages: large investment in equipment (the cost of a set of 1600mm effective width hot melt adhesive ventilating coating composite hot melt adhesive system is more than 400,000 US dollars); the grammage of glue coating is high (composite requirements at an angle of 180 о and a strength of 3.0N/inch For example, the amount of glue used is 4gsm or above);
A cabeça de revestimento precisa estar em contato com o material de revestimento durante o revestimento, o que requer alta estabilidade e planicidade do equipamento de enrolamento e desenrolamento;
The coating process exerts a large tension on the material, while non-woven fabrics and films are required to run under a low tension state, otherwise it is easy to cause tensile deformation of the material, and the product will wrinkle after compounding, thus affecting the quality of the product;
O ajuste da operação é mais complicado: tecidos não tecidos e filmes não são resistentes a altas temperaturas, e a temperatura de uso de adesivos de derretimento quente é basicamente 150 graus Celsius ou acima. A operação de baixa velocidade provavelmente fará com que o material seja escaldado, fazendo com que a produção pare e o desperdício aumente.
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