Ways to improve multi-cavity mould
Moving from a single-cavity mould to one that produces two, four, or eight parts at once seems like an easy way to increase production volume and reduce part costs. This can be true in many cases, but only if the right steps are taken and the requisite homework was done first. Designing a part for multi-cavity molding is not as simple as copying the CAD file for a single-cavity mould multiple times.
The physics encountered when forcing molten plastic through a mould’s sprues, runners, and gates change as moulds become larger and more complex, something that can impact molding performance and part quality. Also, thermal variations within a multi-cavity mould body become more of a concern, and plastic must travel longer distances to reach the finish line, both of which increase the risk of partially-filled cavities and sink as well as part deformation after ejection.
When moving from single- to multi-cavity tooling, it’s important to recognize that parts that behave perfectly in a single-cavity mold might not play well with others, at least not without first making some adjustments or tweaks to the part, the process, or even the material.
1. Adjusting the mould gate
2. Using side-actions
3. Including pickouts
4. Using a family mold
5. Opting for liquid silicone rubber.
Key considerations of choosing plastic raw material for your hanger mould
Keep the following variables in mind when choosing a resin material for your production project:
1. Impact Strength – Some plastic product requires a higher base strength than the rest of them, so the IZOD impact strength of a resin material should be decided before you start the mold.
2. Tensile Strength – We usually use ultimate tensile or ultimate strength to measure a resin’s tension resistance and its capability to withstand a certain amount of load .
3. Flexural Modulus – how much a material can be bent without being damaged and is still able to return to the original shape.
4. Heat Resistance – Some plastic products that require insulation or tolerance for a relatively wider range of temperature conditions, heat resistance is very important.
5. Water Absorption – how much water is absorbed by a material after 24 hours of immersion, usually measured in percentage.
If you still have a problem, welcome to contact SWY MOULD, we can analyze it for you.