TH26487U - Polyethylene pipes with sheaths and manufacturing processes. - Google Patents

Abstract

OCR 10KL (16/09/2025) Sheathed polyethylene tubing consists of a polyethylene tubing (1) which functions as a tube for conveying water, threading electrical wires or communication cables. It is made from polyethylene compound material. The outer wall of the polyethylene tubing (1) is encased in a polypropylene sheath (2) which strengthens the polyethylene tubing (1). It is made from polypropylene resin mixed with calcium carbonate, flame retardant, and blue masterbatch with UV protection to improve its properties.

Claims (2)

OCR 10KL (16/09/2568) 1. Polyethylene tube with sheath consists of a polyethylene tube (1) which is a smooth, cylindrical tube made of high-density polyethylene (HDPE) compound material, and a sheath (2) with a thickness of 1.0-5.0 millimeters made of polypropylene (PP) mixed with calcium carbonate, flame retardant, and blue masterbatch with UV protection in the ratio of polypropylene material 51.0% by mass, calcium carbonate material 5.1% by mass, flame retardant 40.8% by mass, and blue masterbatch with UV protection 3.1% by mass. 2. The process for manufacturing polyethylene pipes with sheaths, according to claim 1, is as follows: a. High-density polyethylene (HDPE) material to be used to produce the polyethylene pipe (1) part is conveyed into the 1st hopper (1ST HOPPER) located on the 1st extruder (1ST EXTRUDER) which has heaters around it to generate heat at a temperature of 190 - 220 degrees Celsius, which is suitable for melting the high-density polyethylene (HDPE) material to melt the high-density polyethylene (HDPE) material from solid to liquid. b. The 1st extruder (1ST EXTRUDER) melts and extrudes the high-density polyethylene (HDPE) material through the 1st die head (1ST DIE HEAD) in the form of a cylinder. Then the melted high-density polyethylene (HDPE) material It will enter a vacuum tank (VACUUM TANK) with a calibration sleeve (CALIBRATION SLEEVE) to form the tubes using a vacuum system to achieve the standard tube size. Then the formed tubes will enter a cooling tank (COOLING TANK) where the tubes will be cooled by spraying water, causing the polyethylene tube (1) part to have a lower temperature. C. The polypropylene (POLYPROPYLENE : PP) material used to produce the polypropylene shell (2) will be mixed with calcium carbonate material, flame retardant, and blue paint with UV protection. D. The polypropylene shell (2) with the added additives will be conveyed into the second hopper (2ND HOPPER) on the second extruder (2ND EXTRUDER) which has heaters around it to create heat at a temperature of 190 - 240 degrees Celsius, which is suitable for melting the polypropylene (POLYPROPYLENE : PP) material. (POLYPROPYLENE: PP) from solid to liquid. The 2nd extruder melts and extrudes the polypropylene (PP) material through the 2nd die head in a cylindrical shape, which is installed behind the cooling tank from which polyethylene pipe (1) flows out, as specified in the production procedure, section b. Then the molten polypropylene (PP) material flows out to coat the outer wall of the polyethylene pipe (1) with another layer, and flows along with the polyethylene pipe (1) in the form of a polypropylene shell (2). The thickness of the polypropylene shell (2) is 1.0-5.0 millimeters, which can be adjusted by controlling the speed of the 2nd extruder to control the amount of polypropylene material. (POLYPROPYLENE : PP) flows out until the desired thickness is obtained. The polyethylene pipe (1) covered with a polypropylene sheath (2) will then be printed with the trademark and product details by a pipe printer. The pipe then runs through a haul-off machine which conveys the pipe while it is in the production line. Finally, the pipe enters a cutting machine to cut the pipe to the desired length.