In the previous post, we had discussed the initial four tips when processing polycarbonate. In this post, we shall be taking a look at the latter points and their importance.
Tips Regarding the Molding Machine and Polycarbonate Components
While the previous post focused more on design elements, this post concentrates on the components and machines.
- Utilize Chromed, Smooth Parts: Polycarbonate products have a tendency to adhere to alloys with high amounts of iron. This can be prevented by plating the screw to create a smooth surface. This will reduce contact with the screw base metal. You can also use chrome-plated endcaps to reduce the possibility of polycarbonate products will stick to the machine parts.
- Dry the Poly Carbonate Quickly: When moisture is in the atmosphere, pellets on the polycarbonate can absorb moisture rapidly. Molding moist polycarbonate can cause splaying, while reducing the polymer’s impact and tensile strength. A desiccant drier should be used to dry the polycarbonate products to less than 0.02% moisture.
- Ensure Machine Purging: In injection molding, purging refers to cleaning the molding machine of one material or color. This is performed by using another color or material to force the existing one out of the machine. Purging is a task that should be done regularly. If not, it is possible that two different pieces of polycarbonate may adhere together. This can result in loss of material, and unnecessary expenditure of time, effort, and money.
Other errors can also take place. The valve can adhere to the endcap. This can result in the valve breaking off when the screw is turned. If the screw hasn’t been given enough time to warm up, the melted polymer can turn into a glue-like substance. It can also stick to and pull off the screw plating.
These points can ensure that the process of molding polycarbonate can be completed without too many problems. Using them can also maintain the strength and durability of the final product.
