Blow Molding - Typologies of Blow Molding - Spin Trimming

Spin Trimming

Containers such as jars often have an excess of material due to the molding process. This is trimmed off by spinning the container while a blade cuts the material away. This excess plastic is then recycled to create new moldings. Spin Trimmers are used on a number of materials, such as PC, PET, PVC, HDPE, PE+LDPE and LLDPE. Different types of the materials have their own physical characteristics affecting trimming. For example, moldings produced from amorphous materials are much more difficult to trim than crystalline materials. Titanium coated blades are often used rather than standard steel to increase life by a factor of 30 times.