Alternatives to overmolding

Jan 15, 2006 5 Replies

Hello all,



I am lead development designer for a new cosmetics packaging (compacts, bottles lipsticks etc)for a very high profile fashion house. The core concept of the the look we have been directed to acheive is a clear acrylic shell with a colored inner wall that shows through from the inside. To acheive this effect, the best way we know is to overmold the two layers and so all design direction for tooling has been to this end. However, the tooling costs that we are recieving from our candidate manufacturers are a little prohibitive. Therefore, I would very much appreciate some input into alternative processes to achaive the colored inner wall effect.



So far, we have considered: spraying - ruled out because hard to control



Separate moldings then inserted: ruled out because fused effect of two materials against each as seen from outside can not be achieve due to reflection from inside surface of acrylic- Any methods to reduce reflection?



insert molding: a form of overmolding, we will proably use in some cases because cheaper methodology but still bond between surfaces can lack integrity



Cubic transfer: won't work because concave area is to be coloured


Our first year production requirements will be @ 100,000 pieces.



Very much appreciate any input,



scorsi



Looks to me as though your alternative forms of manufactue would be more expensive than overmoulding. We use Chinese sources for our overmoulded parts (Instrument Cases) and have found that both part and tooling costs are quite reasonable. I should add that our quantities are at around 1/10th of your estimated annual production.

Pete

Expense is always the issue.

Plasma coatings (ala aerospace & military work) can achieve some surprising results, but again, it isn't cheap.

Bo

Aye,

Me thinks Petey be right mateys. Set the black powder t' the many hands in asia to ease the purse string woes ye be havin scorsi. .

Arrrrr

Insert molding can be designed very strong. Perhaps a mechanical feature can be designed in to hold the over-mold better?

Perhaps you can blow-mold the colored part into the transparent acrylic shell?

hmmmm... Molds fer the blowin.... me old sea wind blown brain never considered that.

Arrrrrrr

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