Production & Quality
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Dimensional Change with Temperature/Thermal Expansion of Cast Polypropylene Film Products
문제 현상
The dimensions of the product change at different temperatures, exceeding the tolerance range.
원인 분석
(1) The thermal expansion coefficient of cast polypropylene film is relatively large, and temperature changes cause dimensional changes
(2) The product is used in a high-temperature environment, and thermal expansion causes the dimensions to increase
(3) The measurement temperatures are inconsistent, and the measurement results at different temperatures are different
(4) The wall thickness of the product is uneven, and the amount of thermal expansion varies from place to place
(5) The product is constrained and cannot expand freely, generating thermal stress
해결 방법
(1) Consider thermal expansion compensation during design
(2) Determine the tolerance range according to the service temperature
(3) Measure the dimensions at the standard temperature (23°C)
(4) Optimize the wall thickness uniformity of the product
(5) Reserve expansion gaps during design
핵심 요약
Thermal expansion is an inherent characteristic of the material, and the influence of temperature needs to be considered during design.
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