Domestic appliances
Washing machine porthole

Customer's Expectations
> Fast colour change to reduce the scrap percentage.
> Correct dimension of the part as ring shape.
> High structural result. Need to move weld lines where will not create internal stress or weak points.
> Complete filling of all the ribs and walls.



Our Solution

To provide a properly filled part, it was considered the maximum number of injection points.
The solution selected (My series and valve gate type) is ideal for those parts with requirement of high structural resistance because it is injecting the expected quantity of material.
The CAE analysis (Fig. 5) and the pressure loss calculation provided:
  - The number of drops and the drops location.
  - The filling sequence approach.
  - The deformation areas and eventual weak points in the structure. It was possible to suggest the proper cooling line on the mould.
  - The correct flow diameter and system layout for obtaining a fast colour change.
It was suggested the colour change procedure and approach to reduce the total number of scrap parts.

Oerlikon HRSflow system
The hot runner system is composed by 4 drops conical valve gate My series pneumatic activation. 
The gate diameter was 3 mm and it used external end ring.
General information
Application field Domestin Appliances
Part name: Washing machine porthole
Part size:  490 x 510 x 17 mm
Nominal weight: 280 g 
Nominal thickness Average 2.9 mm
Material: ABS 
Technology: Inject