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Why are there bubbles,silver streaks and black spots in PET preforms?

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  The production of PET preforms, a critical intermediate stage in manufacturing plastic bottles, involves complex processes that are prone to various challenges and defects. Issues such as material inconsistencies, processing errors, mold design flaws, and environmental factors can significantly impact the quality and performance of PET preforms. Understanding these challenges and their root causes is essential for optimizing production efficiency and ensuring high-quality outputs. This article explores the key problems encountered during PET preform manufacturing, emphasizing material-related defects, process parameter mismanagement, and equipment limitations, while providing actionable solutions to mitigate these issues. 1. Material-Related Challenges PET preform production heavily relies on the quality and preparation of raw materials.  Firstly , inadequate drying of PET resin—a hygroscopic material—can lead to moisture-related defects. For instance, insufficient drying (...
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Drying energy consumption dropped by 260,000 kilowatts，PET preform injection drying！

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  Reduce drying  energy consumption Reduce power consumption from 85kw to 55kw!             Recently, DryingTechJ conducted in-depth research on the PET market, non-woven industry , preform injection molding industry , packaging tape industry , etc.,          We found that these fields generally require efficient dehumidification and drying equipment. Among these industries, PET drying is particularly significant. It usually needs to be heated to 160 ° C. Compared with the drying of other plastics, PET consumes huge energy and has become an important cost for enterprises. 01 【 Electricity Expenditure: Challenges and Demands 】               While pursuing high-quality products, enterprises are facing huge pressure on electricity expenditure. The electricity bill of hundreds of thousands of degrees per year has become a burden that cannot be ignored, directly affecting the economic ben...
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what factors can cause dryer fan failure？How to avoid?

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what factors can cause dryer fan failure ？ 0 1   Filter element  Usually, the manufacturer requires customers to clean the filter element of a dryer every 3 days and replace it every 3 months. Due to negligence or a fluke mentality, users fail to clean and replace it in time. This will lead to poor airflow and excessive fan temperature. 0 2   Condenser lacks water   Due to the interruption of water supply, the water in the condenser evaporates at high temperature, and the return air temperature cannot be cooled, resulting in excessive fan temperature. 0 3   Sealing silicone pad aging, offset desiccant wheel dryer: Since the rotor keeps rotating 24 hours a day, the silicone pad of the rotor base is aged and worn seriously, resulting in air leakage and cross-flow. The rotor belt is stretched and loose, and the rotor stops rotating. Since the rotor is made of silica gel and molecular sieve fired at high temperature, the heat resistance is low. When the rotor sto...
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What is dew point switching technology? What is the relationship between dryer dew point and moisture content?

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People often determine the absolute humidity and relative humidity of the air by measuring the dew point, so the dew point is also a way to express the air humidity. Below is a table about dew point, moisture content, percentage, and relative humidity for your reference. DEW POINT （℃） Relative humidity （ % ） Moisture content Volume ratio of water （ PPM ） Percentage （ % ） -80 ℃ 0.002 0.5 PPM 0.00005% -75 ℃ 0.005 1 PPM 0.0001% -70 ℃ 0.01 2.5 PPM 0.00025% -65 ℃ 0.02 5 PPM 0.0005% -60 ℃ 0.04 10 PPM 0.001% -55 ℃ 0.08 20 PPM 0.002% -50 ℃ 0.16 39 PPM 0.004% -45 ℃ 0.29 ...
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