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<\/p>\n","protected":false},"excerpt":{"rendered":"There are multiple technical difficulties in the production process of PVC leather, which need to be comprehensively solved from multiple dimensions such as raw material control, process accuracy, and environmental management.
\nThe main difficulties and coping strategies are introduced as follows:
\n1. Raw material ratio and stability control
\nPrecise control of plasticizers:
\nThe amount of DOP and other plasticizers added should be strictly controlled within the range of 40-60 parts per 100 parts of PVC resin. Excessive amounts can cause the leather to become too soft, while insufficient amounts can lead to hardening and cracking.
\nSolution: Replace migration resistant plasticizers (such as polyester type) to reduce surface micropores caused by volatilization.
\nProcessing of fillers and additives:
\nWhen the moisture content of fillers such as CaCO3 in hard PVC is greater than 0.3%, high temperature processing is prone to producing bubbles; Insufficient stabilizer addition (<2 parts) can cause resin decomposition and gas production.
\nSolution: Dry the filler to a moisture content of \u2264 0.3%, and add the stabilizer in a ratio of 2-3 parts.
\n2. Technological difficulties
\nDefects in fabric processing:
\nIncomplete desizing of the base fabric (cooking temperature<90 \u2103 or time<30 minutes) results in residual oil stains, reducing the adhesion of the PVC layer.
\nSolution: Boil at 100 \u2103 for 60 minutes+apply a base layer for reinforcement and bonding.
\nCoating uniformity challenge:
\nThe distance error of the scraper is greater than 0.1mm, resulting in uneven thickness (such as the actual fluctuation of the target 0.5mm leather body \u00b1 0.2mm).
\nSolution: Soft PVC uses low shear screws to reduce thermal damage; Hard PVC increases screw back pressure to 22MPa to enhance melt density.
\nDrying and plasticization control:
\nImproper temperature zoning of the oven (such as pre drying zone>80 \u2103) can cause surface crust, and internal volatile matter cannot be discharged to form bubbles.
\nSolution: Soft PVC: Pre drying at 60-80 \u2103 for 3-5 minutes \u2192 final drying at 150-180 \u2103 for 5-8 minutes; Hard PVC: Synchronized upgrade of dual stage vacuum pump improves pumping efficiency by 40%.
\n3. Key measures for quality optimization
\nOnline monitoring: Integrated infrared moisture meter+melt pressure sensor for real-time warning of process deviations.
\nQuick troubleshooting method: replace dry raw materials to verify the source of bubbles; Short term shutdown of the vacuum system to compare the number of bubbles.
\nCross process collaboration: The interval between the base fabric priming and coating processes is \u2264 10 minutes to prevent interface oxidation.
\nBy refining raw materials, standardizing process parameters, and upgrading environmental equipment, the bottleneck of PVC leather production can be systematically overcome.<\/p>\n
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