Co injection molding( or sandwich molding) -Injecting one material inside of another creates a skin (outside) and core (inside). A special co injection nozzle controls the ratio between the first and second components using differential pressure. This specialized process can be used to reduce material waste and cost , improve part performance and part quality ,like the 3 color toothbrush .
The toothbrush is made up of three color ,the transparent handle is filled with green inside and covered with gray outside. We use co injection molding and rotating shaft injection molding to achieve the effect .
Specification of 3-color toothbrush co injection rotating shaft mold
-Mould structure: Multi cavity rotating shaft mold design
-Mould steel: S136 with hardness 45-48HRC
-Hot runner system：Valve gate system
-Ejection system: Eject pin
-Suitable machine : 3-color rotary shaft injection molding machine
3-color toothbrush co injection rotating shaft molding process
-First step :Co injection molding
1.The skin plastic( transparent part) injected into the mold first
2.The core plastic(green part) then injected
3.The skin plastic is injected again,to purge the core material form the sprue
-Sencond step: rotary shaft injection molding
After finishing co injection molding,the mold core insert rotate 180 degree by shaft, then inject the last plastic(gray part).
Focare Mould as a China top multi color mold manufacturer, multi shot co molding solution provider , which has been continuously researching and developing on multi color toothbrush mold, multi color co injection molding solution. we are committed to improving co injection mold process and technologies and optimizing multi color toothbrush injection mold design. If you want to learn more about 3-color toothbrush co injection rotating shaft molding, Multi-cavity toothbrush two color mold,two component toothbrush mold,welcome to contact us.
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