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NewsAccording to the process division, it can be divided into: coated products, single rolled products, cloth foam leather products, various types of artificial leather products, and transfer film artificial leather.
NEWS
Basic methods of artificial leather production
Release time:
Jan 10,2018
Artificial leather production process features dry process (refers to the production process of curing and curing the resin (attached to the base fabric) by heating), wet process (refers to the production of coagulation and solidification of the resin attached to the base fabric by coagulation and water washing) Craft), here is only one.
1. Spinning, pre-spinning and post-spinning. Pre-spinning is to use high-viscosity nylon chips and low-density polyethylene to melt mix under certain temperature and conditions. After spinneret, to form the sea-island structure of the original yarn, according to need Add masterbatch and compatibilizer. Post-spinning refers to the process of drawing, lubricating, crimping, drying and cutting the raw yarn to form short fibers that can be used. For non-woven fabrics.
2. Non-woven fabric
Production process :
Opening the package → Measuring feeding → Coarse opening → Okura feeding → Fine opening → Tuffling doffing machine → Measuring feeding → Combing → Laying the net → Needling → Cut off and take up
The externally processed short fibers are weighed by the weighing feeder. The short fibers after the metering enter the coarse opening machine. After preliminary mixing and opening, the blower is driven into the multi-bin cotton feeder by the fan and sent to the fine by the bottom conveyor belt. The opening machine performs further mixed opening. After that, the fiber is sent to the material separator through the fan, and a certain amount of cotton is stored therein. The fibers in the material separator are sent to the tufting doffing machine by the fan, forming a horizontally and longitudinally uniform cotton feeding layer, and then entering the carding machine for carding to form two layers of fiber webs. After overlapping, they enter the netting machine. . After being laid on the net laying machine into a specified number of layers, it is needle-punched by 5-6 needle punching machines to become a three-dimensional cross-linked nonwoven fabric. The non-woven fabric is ironed by ironing rollers at the specified temperature in the ironing machine to form ironing cloth with a certain thickness and density.
3, Base fabric processing
This process is located in the middle of the production line of superfine synthetic leather. It is one of the important processes for producing the basic structural characteristics of superfine synthetic leather. It immerses the qualified high-density non-woven fabric from the non-woven fabric section with the impregnating solution sent from the preparation process, and then performs coagulation and water washing. It is controlled by different conditions to produce a synthesis with micropores or huge pores The unique substrate structure of the leather basically determines the feel and various physical properties of the final product.
4. Withdraw
The extraction treatment system utilizes the characteristic that polyethylene can be dissolved in hot toluene. Hot toluene is used as the extraction solvent for polyethylene. The extraction method uses convection multi-stage continuous extraction. That is, the pre-processed base fabric is continuously fed into the extraction machine, the toluene solution is continuously fed by convection, the base fabric is repeatedly immersed in a large amount of hot toluene solution, and the composite fibers are in a bundle-like structure by squeezing with a pressing roller, In the chase tank, the residual toluene is eliminated by the azeotropic action of water and toluene in the chase tank to achieve the purpose of extraction.
5 Post-processing
Enlarged drying
After the extraction process, the base fabric undergoes a morphological change, shrinking laterally and longitudinally elongated, the directionality of the base fabric performance becomes greater, and the base fabric contains a lot of moisture, which will bring further processing to the base fabric. difficult. The base fabric passes through a drying and spreading machine, and is stretched laterally while being dried at a certain temperature and rate of expansion. The width-expanding dryer is heated by circulating hot air, so that the base fabric is initially heat-fixed and shaped to improve the flatness of the base fabric and the subsequent processing performance.
Oiled hydrophobic treatment
The oiling solution is made up of a certain proportion of softener and water, and the softener also has hydrophobic properties. The base cloth is repeatedly immersed and squeezed in the oil bath in the oiling machine to make the oil fully penetrate into the base cloth. Internally, the softness of the base fabric is improved, and after the base fabric is hydrophobic, it can delay the hydrolysis of the polyurethane inside the base fabric, so that the performance of the fiber is increased, thereby improving the softness and physical properties of the ultra-fine fiber leather product.
Dry shrinkage setting
After the hydrophobic treatment of the oiling machine, the morphological stability is affected, and it contains a lot of water. In the further processing of the base fabric, the morphological changes and moisture have obvious and serious adverse effects on the quality. The base fabric must be dewatered and shaped. Under certain temperature and shrinkage conditions, the base fabric is dried and shrinked by a drying shrink setting machine heated by hot circulating air. The fibers in the base fabric shrink in parallel, increasing the density between the fibers. The shape of the base fabric can be formed stably, and the appearance can be smooth and smooth, thereby improving the physical properties and apparent quality of the base fabric.
Hot pressing ironing
After drying and shrinking the base fabric, the base fabric itself has small unevenness, which affects the processing performance of the base fabric to the final product. The drum dryer is filled with steam and has a certain surface temperature and pressure. The base fabric is subjected to multiple ironing treatments, which greatly improves the smoothness of the base fabric surface and makes it a high-quality intermediate product.
6. Noodle making
The dry PU resin for leather is formulated into a dry PU slurry with a certain concentration and color according to the process requirements, and is evenly coated on the release paper with a certain gap. After drying, the solvent volatilizes to form a PU film with a certain pattern and color . Then use PU adhesive resin to bond the base fabric and PU surface film together. After drying or curing, the release paper and leather products are peeled off to produce a dry pattern leather with a certain pattern and color. According to the different surface processing technology, it can be divided into quick peeling type and aging type
There are many changes and adjustments in each process, and there are other processes according to the function and market requirements. Such as kneading, grinding, dyeing and finishing, peeling, scraping and coating, printing, functional finishing and many other things, for reference only .
Concerned Nanhua Plastics:
Phone: +86-51086901537
Fax: +86-51086901198
E-mail: myseller@jdnhsy.com
Address: Zhouzhuang Industrial Park, Jiangyin City, Jiangsu Province, China
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