Unexpected quality problems often occur in the production process of PE pipes, which are generally caused by problems with equipment or raw materials. The following will introduce the common PE pipe quality problems and the causes and solutions of quality problems based on the experience of PE pipe production over the years. Ripple on the surface of the pipe: Reason: 1 Insufficient cooling 2 The size of the sealing ring is not suitable, forming a vibration phenomenon. Solution: Increase the sizing amount of water or increase the distance between the mouth and the sizing sleeve. Check if the vacuum groove seal is small. If it is small, replace or properly reduce the vacuum of the vacuum section and increase the vacuum of the second section. Surface pitting (mainly the inner wall): Reasons: (1) Impurities in the raw materials (2) The inner wall of the mouth and the core are not cleaned cleanly. (3) The local temperature is too high, leading to aging. Solution: (1) Check the raw material (2) clean or transition for a period of time (3) check the temperature sensor. Surface pit: Reasons: (1) Material tide, bubble rupture (2) The sizing amount is not uniform. Solution: (1) Drying of raw materials (2) Adjusting the amount of water or replacing the sizing sleeve Bright spots on the surface: Cause: The sizing amount is insufficient. Solution: increase the sizing amount of water or replace the sizing sleeve with large water volume. The inner and outer walls are axially rough: Reason: The water content of the raw material is too high. Solution: Raw material drying treatment The surface is not bright: Cause: The melt temperature is not suitable or there is a problem with the raw material Solution: Adjust melt temperature or replace raw materials Outer surface scratches: Reason: sandstone is attached to the sizing sleeve, support plate or seal ring Solution: Clean the sizing sleeve, support plate or seal Outer surface waterline: Reason: The local water eye of the sizing sleeve is blocked, causing the water volume of individual water eyes to be too large. Solution: Clean the sizing sleeve Inner wall groove (appears in wall thickness pipe): Cause: The wall thickness is too thick, and the melt is difficult to cool, resulting in flow. Solution: Try the central cooling system to reduce the temperature of the mouth and core touch. Uneven wall thickness: Reasons: (1) The mouth touch or core touch bolt is loose, and the gap between the mouth and the touch is not properly adjusted. (2) The temperature of the mouth or core touch is uneven, resulting in inconsistent flow. (3) The sizing sleeve is not aligned with the mouth, the spiral splitting shuttle or the screen is blocked. Solution: (1) tighten the bolt or adjust the mouth gap (2) check the heating ring and temperature sensor (3) adjust the sizing sleeve and the mouth to touch the split shuttle or screen. Low elongation at break: Reasons: (1) Poor quality of raw materials (2) Increased orientation and increased cleanliness Solution: (1) adjust the process temperature, enhance the plasticizing effect (2) increase the distance between the mouth and the sizing sleeve. Large ovality: Reason: gravity Solution: Add calibration device PE pipe manufacturers must establish a strict raw material supplier evaluation procedure, select appropriate raw materials and conduct appropriate treatment according to the detection of raw materials. The production of high-quality polyethylene pressure pipe has strong dependence on the comprehensive output capability of the equipment. Pipe manufacturers must fully investigate and demonstrate the equipment selection, in order to select equipment with higher cost performance. Pipe manufacturers should establish strict operating procedures and technical procedures and strengthen the process and control, in order to achieve the purpose of controlling the quality of the pipe and reasonable reduction of production costs. The process setting of pressure pipe and the resolution of quality problems in the production process require a lot of production experience, which requires manufacturers to accumulate a large amount of raw data, analyze and summarize, and guide production to achieve a steady improvement of product quality. Tetanus Toxoid Vaccine,Toxoid Vaccine,Hep B Immune Globulin,Immunoglobulin Injections FOSHAN PHARMA CO., LTD. , https://www.pharmainjection.com