I. What is a two-color plastic injection machine?
I.1 Definition, application
🔹 The plastic injection machines we often encounter will only have 1 injection cluster, this type will only be able to provide 1 color or 1 type of plastic for 1 production. If you want to produce products with many colors, you will have to divide the labor. paragraph
Stage 1: injection molding color 1 / material 1
Step 2: Attach the product in step 1 to the mold and inject color 2 / material 2....
➜ Processes arise, productivity is poor.
🔹 2-color plastic injection machine is a machine with 2 injection clusters for the ability to press 2 colors / 2 materials in 1 production.
The purpose is to produce both products with 2 colors or 2 types of materials
I.2 Structure of two-color plastic injection machine
The 2-barrel plastic injection machine has 2 separate injection clusters
There are 2 main structural types
- Type 1: Two parallel spray clusters


Type 2: Original machine (1 spray cluster) with additional injector cluster installed


I. 3 Operating principles of two-color plastic injection machine

II. Mold of two-color plastic injection machine
II.1 Classification of molds for two-color plastic injection machines
🔹 The mold for 2-color plastic injection machines is a special type, it cannot be used on single plastic injection machines and vice versa (because the mold for 2-color plastic injection machines has 2 independent plastic channels)
🔹 There are 2 types of 2-color plastic injection molds corresponding to 2 types of injection cluster layout of the injection machine.
II.2 Production and maintenance
🔹 Two-color plastic injection molds have a more complex structure than single-color molds in the channel part.
🔹 The number of mold maintenance shots needs to be calculated according to the type of plastic with more stringent maintenance requirements.
III. Note when pressing two-color plastic
🔹 The adhesion of the two materials must be good.
🔹 The material in the first injection must have a melting point equal to or higher than the second injection.
🔹 The surface of mold cavity 1 needs to have high roughness to increase adhesion
ASG Vietnam Engineering Company Limited is a unit specializing in handling plastic injection problems with more than 10 years of experience. We are always ready to listen to your questions 24/7 according to Hotline 0917.54.88.11