Plastic Injection Mold Making for TPE Seal

Basic part information:

•  Part size: Cylindrical in shape ID 89.5 mm  and OD94.2 OD and 55.5 mm high.

•   on the OD there are 4 fin seals

•  Material: TPE

•  Color: BLACK

•  Production volume:2000pcs

Basic mold information:

•  Gate type: The submarine gate

•  Cavity number:1*1

•  Material: S136H

•  Shrinkage: 1.013

Before making the injection mold, YEESHINE will make DFM analysis of the plastic part and verify some important information with the customer, like parting line, gate position, ejection, etc.

After the verification with the customer, YEESHINE made 3D design layout of the injection mold.

We experience the following problems in the process of making plastic mold parts:

Flashing / burr is the appearance of excess plastic on the parting surfaces of the mould or the ejector pin, etc., so that the part will have irregular edges in the above places.

Cause for emergence:

•  The mould clamping force is insufficient.

•  There are defects in the mould.

•  The moulding condition is unreasonable.

•  Exhaust system design is not proper.

Yeeshine propose the following solution:

a. Mould design: Reasonable design of the mould to ensure that the mould can be closed when the mould is closed.

b. Injection moulding machine: To set the appropriate size of clamping force, ensure that the two mounting templates of the injection moulding machine are parallel to each other and increase the model of the injection moulding machine in order to increase the clamping force.

c. Process conditions: To reduce the temperature of the barrel and nozzle; To reduce the pressure of the injection moulding machine and the holding pressure; To increase the injection time and reduce the injection temperature; To decrease the buffer length, so that the melt does not overfill in the barrel.

We finally solved the problem of the Flashing.

Remark by YEESHINE

After confirming various details, the client is confident that we can meet their requirements.

We make the product according to the customer's requirements and the customer is satisfied when he received the product.