PVC technical knowledge

PVC available solution, suspensions, plastisol, films and other forms of coating on the fabric substrate. Due to the use of raw materials, product performance requirements and the different uses, the process is also different. The process used the following three types: coated Law is divided into direct coating method and carrier transfer coating method; rolling method; legitimate layer is divided into adhesive laminating and hot melt laminated.
1. Coating method
1.1 direct coating method: PVC plastisol coated fabric substrate pretreatment Squeegee knife or roller directly, and then the process of plasticizing, ginning, cooling, coiling process to produce PVC Artificial Leather called direct coating method . This law is the earliest and most simple process, can produce fabric substrate ordinary leather, foam leather, floor leather, etc.. Because the device is simple, less investment costs and higher production efficiency. The drawback is the need of a large amount of the emulsion resin, product quality is difficult to control (particularly those affected by the influence of the substrate), the fabric substrate require pretreatment, the low strength of the fabric substrate (such as a knitted fabric, paper, inferior recycled cloth, etc.) can not be used, suitable for the production of thin leather.


1.2 carrier transfer coating method: plastisol Squeegee knife or roller coated Pregelatinised loop carrier substrate with semi-gel coatings fit together, completely plasticized After cooling, the paste compounds peeled off from the carrier, and then the film or surface treatment, ginning manufacturing PVC Artificial Leather, the process is referred to as the carrier transfer coating method. This process is suitable for a knitted fabric or non-woven fabric substrate, the production of foam leather, recycled cloth, canvas, etc. may also be applied to the city of cloth. The carrier used in the stainless steel strip, a metal mesh, the release paper, the silicone rubber belt, our current use of the stainless steel belt.


2. Rolling method
The kneaded mixture in the calender to prepare the film or sheet need bonded with the preheating of the fabric substrate, then by embossing, cooling, surface treatment such as an artificial leather, the method is called a calendering method. It can produce general leatherette and foam leatherette. Each step operation in the production of foam leather when calendering before temperature must be controlled below the blowing agent decomposition temperature, foaming After the plasticizing. In order to improve the bonding strength of the film and the substrate, to prevent the plastic material to penetrate the substrate, usually required coating on the substrate a layer of adhesive. Production efficiency of this method, the raw material is easy to solve (suspension resins), artificial leather production methods.


3. Layer legitimate
This method is the first with the calendering method of manufacture of the sheet, the adhesive is pre-coated into the fabric substrate, with the laminating apparatus can be embossed to the treated fabric substrate and the sheet are bonded together. Laminated in two ways: one is the adhesive to the PVC sheet, then paste the substrate. Another is based on a thermoplastic hot melt properties, so that the prefabricated sheet after heating and the fabric substrate are bonded together. Ordinary PVC Leather and foam leather can be produced this way. Which is characterized by simple operation, easy swap varieties, multi-fit, suitable for the production of thick leather more than 1mm.

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