First color material: ABS
Second color village quality: PMMA
Two materials of first color and second color have good adhesion to each other.

 

As picture shows:
Principle of product parting line is to ensure consistency of back mold.

 

As picture shows:
Shape of second color is basically in the front and back, and has little to do with back mold side. Focus is on parting line of the first color.

 

As picture shows:
In order to prevent second color lagging from not being strong enough, some inversions were made at the first color.
Combined with principle of product encapsulation, large surface encapsulation of perimeter is adopted, and there is no need to make an upside-down button at the first color. This structure can be communicated with product engineer before mold is opened, and area of first-color undercut hole can basically be eliminated.

 

In this case, in order to ensure consistency of shape of rear mold core, it is necessary to do a slider core pulling in undercut area on movable mold side, which greatly increases complexity of mold.

 

As picture shows
Rear mold slider also adopts a T-shaped chute structure, and core pulling distance of T-shaped groove on mother mold side is not same, so as to ensure that the first color is formed against front mold to break sealant, and second color should avoid glue position space.

 

As picture shows
The first color slider and front mold side are against sealant.

 

As shown in picture: second and first sliders move back to make room for second color PMMA glue.

 

As picture shows
The first color material: ABS, using hot runner to turn horn into glue, there is no problem.

 

As picture shows
Second color material PMMA also uses hot runner to turn horns into glue, which has a great risk, it is easy to produce flow marks and air lines near glue inlet point, which cannot be solved.
The biggest disadvantage of PMMA:

It is brittle and easy to break.

 

As picture shows
Product ejection style.

 

As picture shows
2 colors share mold base, but glue feeding point adopts a 90-degree style. The first color uses mold center point to directly feed glue, but second color feeds glue at 90-degree barrel on non-working operation side.

 

As shown, post-die rotation style is still being used.

 

As shown in picture: side plan view of fixed mold of two-color mold.

 

As picture shows
Moving die side plan style.

 

As picture shows
When the first color is rotated 180 degrees, when second color is formed, the first color product feeding point needs to be designed to avoid void.

 

As picture shows
In order to better seal perimeter of the first color product, when second color is formed, a preload of 0.05~0.1mm is reserved in sealing area, and unsealed area of first color product can be avoided by 0.2 mm ~0.5mm, key is to facilitate mold processing.

 

As shown, second color is inside slider style.