A uniform cooling of the part is important in the injection molding process in order to reduce shrinkage and warpage.
Especially in long and narrow areas the cooling layout is often difficult.
The reason is insufficient space to drill holes next to each other.
When there is only enough space for one hole, it is recommended to use a bubbler.
A tube is inserted into the hole.
The coolant flows inside the tube to the end of the hole and back on the outside.

Bubbler in Plastic Industry

Injection Molding: The bubbler consists of a drilled hole with an inserted tube.

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This glossary of plastic industry is provided by PLEXPERT Canada Inc.