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Detaisl contact: Jacky Qiu: 8613533665622
Skype: df mold
One-stop plastic injection molding Details: Jacky Qiu 8613533665622
There are several factors that could cause a part to distort.
When considering the contributors to warpage, it is convenient to
identify shrinkage due to:
- Variation in shrinkage from region to region (differential
- Temperature differences from one side of the mold to the other
- Variations in the magnitude of shrinkage in directions parallel and
perpendicular to the material orientation direction (orientation
Each of these types of shrinkage will contribute to the total
warpage of the product.
This type of shrinkage is often caused by variation in crystalline
content and volumetric shrinkage. The following figure shows a thin
rib attached to a thick top. In general, the cooling rate of the
top will be lower than that of the thin section. The top will have
increased crystalline content and therefore, will shrink more and
cause the warpage shown.
The following figure (a) shows saddle warping of a centrally gated
disk with high shrinkage around the gate. Conversely, if the
shrinkage is higher around the outer part of the disk, the
resulting warpage may cause the disk to dome, shown in (b).
Shrinkage due to differential temperature typically results in
bowing of the component, as shown in the figure below. Usually this
type of shrinkage is due to poor cooling system design.
While the part is in the mold, temperature differences from one
side of the mold to the other cause variations in shrinkage through
the thickness of the component. In addition to this, any
temperature differences at ejection will cause further warpage as
both sides of the part cool to room temperature.
Orientation causes variation in the magnitude of shrinkage in
directions parallel and perpendicular to the material orientation
direction. This type of shrinkage can produce warpage similar to
that of differential shrinkage. Figure (a) below shows the warpage
when parallel shrinkage is greater than perpendicular shrinkage. On
the other hand doming can be produced if the perpendicular
shrinkage is higher than parallel shrinkage, see (b).
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Japanese standard of QC management & Euramerican standards
Designing the mould, CNC processing and other tooling, assemble all
OEM & ODM service
UG, PRO-E, CAD, CAXA, etc
Mould base Standard
LKM , HASCO , DME, etc
NAK80, S136(H), 2738, 718&738 and P20 etc
hardness of steel:
500,000-1,000,000 shots as you required
Final products’ materials
ABS, PP, PE, POM, PA6(66)+GF, PC, PMMA HIPS, GPPS etc
Final Products’ colors
Any color as your required
25-50 workdays based on the different products
Relevant requirements reachable
ROHS, UL, or as requested
Wooden case package or follow customers' requirement
FOB Shanghai Port, China
T/T, L/C at sight
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