Screen printing process and ink identification of

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Silk printing process and ink identification of plastic bags

1. Prepress treatment. The surface of plastic film is best treated by spark or flame. Shandong Longkou daoen group and nearly every power supply department in North China use Beijing University of chemical technology. Through the research and development of TPV formula design and preparation process methods, special core equipment, post-processing and utilization technology, the fastness of the currently available non-treatment plastic ink after printing has been improved, but the fastness of the printed matter has decreased after being placed for 1 ~ 2 months

2. Post press processing. Natural drying is slow and takes up a lot of space; If there are conditions, if a conveyor belt of drying device is self-made, the efficiency and quality can be greatly improved

3. selection of printing materials. Different types of plastics use different inks. Although they are all plastic inks, if you choose the wrong type, the printing ink will easily fall off. For example, soft polyethylene ink, soft polypropylene ink, soft polyvinyl chloride ink, etc., the first problem is to identify the type of plastic

hand kneading test: polypropylene is brittle and noisy, and PVC is the colorful plastic cloth on the market

combustion test: Polyethylene burns fast. How to choose fixtures for hydraulic universal testing machine? What should we pay attention to when choosing fixtures? It does not self extinguish, does not produce drops, and has the smell of wax. Polypropylene is similar to polyethylene, but has the smell of mosquito repellent incense, which is very irritating. Polyvinyl chloride burns fast, with yellow green flame and hydrochloric acid smell

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