With the maturity of the initial processing of non-woven fabrics, more and more companies are turning their attention to the deep processing of non-woven fabrics in order to increase the added value of products and the profits of enterprises as much as possible. In China, the application fields of hot melt adhesive coating equipment have been continuously expanded. The medical and sanitary materials production departments are the most widely used industries of this kind of equipment. The rapid development of the automobile industry in China has also driven the hot parts manufacturers to heat. The demand for melt coating equipment, related information shows that the domestic geotextile industry has recently introduced the first hot melt adhesive production line to date. As a mature and evolving process, hot melt adhesive coating technology will become better and better in the non-woven deep processing industry. Disposable medical products (such as surgical gowns, surgical quilts, hole towels, gloves, shoes, hats, etc.), industrial protective products, personal care products are mainly based on non-woven composite film products, these industries for products The requirements are almost the same, namely water resistance, breathability and comfort. This paper will introduce a new type of non-woven fabric and film composite technology based on the analysis and comparison of several major technological features of medical and sanitary materials. The prior art ◆Laminating: This technology is the most used by domestic enterprises. A method, characterized by simple and mature process and fast production speed (about 100m/min). Disadvantages: Do not make products with breathable requirements; hard feel and poor comfort; high requirements for non-woven fabrics. Non-woven fabrics with a low gram weight (below 18 gsm) and a low coating amount (below 15 gsm) are not ideal, because the unevenness of the surface of the coil makes the coating process easy to cause leaks. ◆ Hot rolling: It is the standard process for manufacturing composite non-woven fabrics in two-step process. Some domestic enterprises use this technology to make composite production of membranes and fabrics. Features: Ready-made equipment and processes are available. Disadvantages: the composition of the film is PE, and the composition of the non-woven fabric is polypropylene. The melting point of the two is different, so the temperature of the hot roll can not be taken into consideration at the same time; the heat capacity problem of the hot roll makes the composite strength uniformity of the product at different production speeds at the same temperature. Poor; the processing precision of the hot rolled flower roll is also a factor affecting the quality of the product; the hot rolling method has a higher gas permeability loss rate (between 30-40%) for the gas permeable film material; the production speed is slower. ◆Wood powder compounding: A method of uniformly spreading hot melt adhesive powder on a non-woven fabric or film and then compounding it by heat. Features: The thermal pressure roller uses rubber roller and smooth roller to damage the material very little. Disadvantages: slow production speed and low production efficiency; uniform spreading of hot melt adhesive powder is the key to product quality, but the moisture absorption of hot melt adhesive powder makes it difficult to evenly spread the cloth. Control; the melting temperature of the hot melt adhesive powder is higher, the melting temperature of the gas permeable membrane is lower, and the hot melt adhesive powder cannot be completely melted during the compounding, so that the peeling strength is insufficient and the surface flatness of the composite film is not good. ◆ Hot melt adhesive breathable coating compound: Features: fast production speed, low gas permeability loss rate of gas permeable membrane material (between 20-30%). Disadvantages: large equipment investment (a set of 1600mm effective width hot melt adhesive coating composite hot melt adhesive system costs more than 400,000 US dollars); the weight of the glue is high (angle 180о, strength 3.0N / inch composite requirements) For example, the amount of glue used reaches 4gsm or more); when coating, the coating head needs to be in contact with the coating material, which requires higher stability and flatness of the rewinding and unwinding equipment; Large, but non-woven fabrics and films are required to operate under a small tension, otherwise it will easily cause tensile deformation of the material, and the product will wrinkle after the composite, thus affecting the quality of the product; the operation adjustment is more complicated: non-woven fabric and film Can not withstand high temperature, and the use temperature of hot melt adhesive is basically 150 degrees Celsius or above, low speed operation is easy to cause the material to burn, causing production pauses and waste products. Proposal for a new process In order to provide a more effective solution, American ITW Dynatec recently launched the patented DYNAFIBER (tm) hot melt adhesive fiber (UFD) spray compounding technology. The fiber-type spray glue process adopts high-tech, high-precision airflow high-frequency oscillation technology and laminated nozzle structure design, which makes the liquid flow distribution more uniform, the diameter of the rubber fiber is well controlled, and the fiber thickness is consistent and continuous. Due to the flaw of the granular glue point caused by broken wire, the controllable filament swing frequency and swing amplitude can be controlled within a certain range. The industrial first internal filter function design effectively eliminates the nozzle blockage problem. In addition, the process also has: Eco-leaching: at the same composite strength, the glue is up to 40% higher than the traditional composite method; uniform glue: unique patent design improves the control of liquid flow pressure and fiber filament. The left, right, front and back glues of the composite product are more even and accurate, so that the composite non-woven fabric maintains superior gas permeability and flexibility; Maintenance-free nozzle: unique gasket type nozzle structure design and filtering function, nozzle does not need to be washed and washed , greatly reduce the production of defective products caused by nozzle blockage, and reduce maintenance costs; high hardness special stainless steel design: greatly improved service life and maintenance cycle; non-contact spray: eliminates the traditional coating equipment and materials The effect of flatness, tension, heat resistance, production speed on the quality of the composite product, and the gas transmission loss rate of the gas permeable membrane is minimized; easy to install and adjust: simple operation, no need to adjust each nozzle, the gas consumption is extremely low; Glue width: 4mm-7000mm; production line compound speed: up to 900m/min; hot melt adhesive fiber wire thickness can be controlled from 2-50um.