As to the Chinese partners ,yes,most of the American firms have
parter firms in China, while as you said ,the partner cost will be
increased much especially,because both of them are growing at the
same time ,so the American firms will turn to the new
parters,that's why they will get so many introduction emails every
day. Hope this comments would help all to understanding Chinese
factories and try your best to be patience to commuction with them
,then you will found you get exceed your expection.
If you are a seller, do you know what are the customer's mostly
concern aspects on selecting an plastic injection molding maker in
China? If you are a buyer, how do you select a reliable mold maker
in China?
I think there are a few good points here. One thing to keep in mind
is what is the GOAL. How much material could you save by having a
hot runner to each part? Is it worth the expense of the hot runner?
Will you actually save that much money by using a hot runner?
Another thing to consider is hot runners will typically vary more
during production. There are simply more things to go wrong with
hot runners(more variables to account for). Cold runners are simple
and will not change. Another thing to consider is the rheological
factors. By using a hot runner you might find that higher shearing
laminates will bias one portion of the part over another portion of
the part and this could possibly differ from one cavity to the
next. Of course this could all depend on the configuration. You can
reduce a few of these variables by going to a hybrid system or a
hot - to - cold. But once again I would say everything depends on
what is the final GOAL. If there is not much to lose by creating
some scrap/regrind.... I would say Hot - to - Cold or Full Cold
runner. If you have a concern of cost of scrap/regrind and the part
does not call for absolute precision then maybe a full hot system.
Just be sure to concentrate once again on what is the GOAL.
A lot of good points have been brought up but there is a lot of key
information missing to properly answer the question. I'm personally
a fan of hot runner molds, especially in multicavity tools in the
right application. There are a lot of things that need to be
considered up front though. The resin that the part is being molded
from has to be considered, production quantity (assume it's high as
you're considering 4 cavities), program life, color changes, staff
familiarity with hot runner systems, etc... And as Kevin stated we
need to know what the goal is to give you some more solid
advise.
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