久久激情5月丁香伊人_αv中文字幕女人乱码在线_成年人看的毛片在线观看_国产上床视频_精品亚洲国产黄片_三级日本黄页网站大全_国产美女精品网站_在线观看中文综合亚洲_男操女视频免费_亚洲中文字幕无码永久

The forming process of PVC plastic pipes should start from the raw materials of PVC plastic granules, which can be divided into soft PVC and hard PVC according to the added amount of stabilizer, plasticizer and lubricant.

According to the use of soft PVC or hard PVC as raw materials, PVC plastic pipes are divided into soft and hard pipes: hard PVC plastic pipes are made of PVC resin mixed with stabilizers, lubricants, plasticizers and other additives, and extruded after granulation; Soft PVC plastic pipe is made of PVC resin, plasticizer and other additives with high components, and extruded after granulation. The difference between the two kinds of pipes is that rigid PVC plastic pipes have good chemical resistance, corrosion resistance and insulation; Flexible PVC plastic pipe has excellent chemical stability, electrical insulation and good softness.

The following is the forming process flow of PVC plastic pipe:

Production process: preparation of raw materials + additives → mixing → feeding → forced feeding → conical twin-screw extruder → extrusion die → sizing sleeve → spraying vacuum setting box → soaking cooling water tank → ink printer → crawler tractor → knife lifting cutter → pipe stacking rack → finished product inspection and packaging.

Article source: PVC engineering plasticshttp://www.xrtsm.com.cn/