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Design of Product Wall Thickness
Published on Nov 28,2019 09:12

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basic design

Wall thickness depends on the product needs to withstand the external force, as the other parts of the support, the number of protruding parts and the choice of plastic materials may be. The general design of the thermoplastic wall thickness should be limited to 4mm. From an economic point of view, too thick products will increase material costs, extend the production cycle (cooling time) and increase production costs. From a product design standpoint, it also will increase the chances of producing stomata, greatly impairing product rigidity and strength.

The optimal wall thickness distribution is undoubtedly the uniform thickness of the cut in any one place, but it is always inevitable to change the wall thickness to meet the functional requirements. In this case, the transition from a thick compound to a thin compound should be as smooth as possible. Too sudden changes in wall thickness can lead to dimensional instability and surface problems due to different cooling rates and turbulence.

Plane criterion

In most hot melt process operations, including extrusion and curing, uniform wall thickness is very important. Thick plastic place cool more slowly than the next thin plastic parts, and in the meeting place there will be shrinkage marks. What is more, there will be shrink printing, thermal stress, bending part of the distortion, different colors or different transparency and so on. If the thick glue into a thin plastic place is inevitable, then try to design a gradual change, and not exceeding the wall thickness of 3: 1 ratio. The figure below is for reference.

Angle criterion

The key to the uniformity of the wall thickness is also needed in the corner, so as to avoid the inconsistency of the cooling time. Where the cooling time is long, there will be a contraction, which causes the deformation and deflection be out of shape and bend. In addition, sharp rounded corners often result in component defects and stress concentrations, and the location of sharp corners often causes undesirable build-up of material after the electroplating process. Concentrated stress will rupture when loaded or crashed. Larger rounded corners provide a solution to this disadvantage by not only reducing the stress concentration factor but also allowing the flow of the flow of plastic to be smoother and easier when the finished product is released. The figure below is for reference.

Wall thickness restriction

Different plastic materials have different mobility. Too thick will be shrinkage, too thin is not easy to flow through. Here are some suggested sizing options for reference.

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