Moulds, also called molds or dies, are actually a kind of tooling and are key to pulp molding machine. Some moulds maybe are interchangeable when they are used for manufacturing of simple molded fiber products such as egg trays or cup carriers. But when comes to complex and variable structure, such as industrial padding &cushioning, they are not universal anymore and each unique product correspond with their own mould.
During molding process, all sections of a fiber product are deposited uniformly. That is to say, the thickness is required to be even everywhere no matter the shape of the product is how complicated.
To improve molding performance, prevent pulp fiber from sticking to net, and be easier to demould, following points need to take into consideration before moulds designing.
- opening diameter, clearance and rate
- air space is convenient for drainage
- adjustable mould assembly for easy maintenance
- fillets designed avoid breakage of molded products due to concentration of stress
We highly recommend cast aluminum for both forming and transfer mould. Compared with other material, cast aluminum mould is :
- with higher corrosion resistance, proper strength, hardness and heat endurance
- have better weldability
- featured with better machineability, which will shorten tooling cycle
- widely used in molded pulp industry
Surface is polished and proceed machining with CNCs ensure precision.
Net plays an important role in vacuum suction & filter. It’s covered on molds and helps to separate quite a lot of liquor from pulp.
Rate of water loss mainly depends on geometrical shapes and mesh of net opening:
- geometrical shapes may be square, rectangular or hexagonal
- mesh ranges from 40 to 65
We recommend net that is made from stainless steel because of smooth surface, good ductility, heat & corrosion resistance, and can be covered on any complex surface ( concave, convex, cambered surface or grooves)