If you have ever considered buying a flip top cap mould […]
If you have ever considered buying a flip top cap mould, or any other food packaging mould, you may well be wondering if it is possible to make your own. After all, if you think about it, the very purpose of plastic caps in the first place is to enable easy access to food for consumption by humans, and other animals, and the manufacturing process in itself is quite simple. Plastic is simply molded into forms, and these are then used to cover and seal products, such as plates and boxes, so that we can use them for various different purposes. In the case of caps, this simple molding procedure is often combined with the use of heat or pressure to help create different shapes and forms. In addition, these caps can also be made from a wide range of different materials, including metal and ceramic.
Of course, the simple molds used for food packaging are not the only ones that can be used... As you may be aware, there are a whole host of different kinds of molds, or casting methods, available nowadays. Some of these moulds work better for certain kinds of products, while others may work better for plastics that have a slightly different structure or composition to start with. So what kinds of flip cap moulds can you get? Here are some options, along with some considerations that you should make before you buy.
First off, there is the injection moulding process. In this type of mould design, a cavity is heated up (usually by an injection of molten plastic or hot metal) and then the cavities collapse to form the walls of the moulds. Once the cavities collapse, they seal themselves and prevent air from getting inside. This kind of mould design can be used for a large number of different purposes... although the kinds of things that an injection moulding manufacturer can make from this type of mould are limited. For example, cavities may be needed to form capsules for medical purposes; and some manufacturers might have their own injection mould design for capsules.
Next there is the hot plastic extrusion method. In this type of mould, a cavity is heated up (usually by an injection of hot plastic) and then plastic is forced down into it. The walls of the mould are made of the plastic as well as the melted plastic, and the walls are also held together using heat-rejectors. The downside to this type of process is that the plastic can often warp when it is first placed into the mould, and there is also the potential for the plastic to split when it is released from the mould into the final product. Another downside is that the amount of plastic used in this process is limited; and the plastic injection moulds may need to be repaired once used. Once again, this process is best used for products where the price of the raw materials is not an issue.
Finally, there is the two color flip top cap mould. In this type of mould, a cavity is filled with colored plastic resin which is allowed to cool below its critical temperature. When the resin reaches its critical temperature, it is pushed into a larger mould, where it is filled with melted plastic before being ejected in to the final shape. The downside of using this type of mould is that it can take up to two full days to reach optimum temperature, and the mould may need to be repaired after each use. It can also be prone to breaking if a strong force is used to force it open - such as when the cap is removed abruptly from the bottle - which could result in the contents of the bottle escaping and possibly damaging the plastic resin.