Why is the Product Produced by an Injection Molding Machine Very Soft?

Not hot enough: In injection molding, plastic needs to be injected into the mold at high temperature and pressure in order to form the desired shape. If the temperature isn't high enough, the plastic won't melt enough, resulting in a finished product that's too soft.

Improper mold design: The design of the mold may also affect the hardness of the finished product. If the cavity in the mold is too large or too small, or if the surface of the mold is not smooth, the finished product may be soft or have an incomplete shape.