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Countermeasure against deformation in L-shaped and U-shaped molded product

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Countermeasure against deformation in L-shaped and U-shaped molded product

Issue Time:2020-08-11

(1) At the corner part, outside cooling will be faster than the inside, so this shape tend to deform towards the
inside direction.
(2) Remedying by placing the gate on the corner part is sometimes possible if it is GF reinforced grade.
(3) Lightening the corner inside part is effective. Make the recess part round, and do not make the sharp
corner.
(4) If there is no limitation, place a triangle rib towards the corner. Take the triangle rib from the high location
as possible, and the thickness have to be thinner than the half of the base.
(5) If the triangle rib cannot be placed to the inside, putting a T-shaped rib on the outside of the corner is
another method. 
Fall down deformation of L-shaped molded product
(A) Gate placement to the corner part
(B) Recess of corner part
(C) Triangle rib 
(D) Adding T-shaped rib 
Figure 3-9 Fall deformation examples of L-shaped molded product