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Ann R. Thryft
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Blogger
Re: Double duty to the rescue
Ann R. Thryft   11/18/2011 1:28:17 PM
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To answer your question, Beth, it appears that the technology has not yet been fully commercialized, since DuPont says it is still refining and testing the two methods.

RR Engineer
User Rank
Iron
Re: The Price to Upgrade
RR Engineer   11/1/2011 11:06:03 AM
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The method is limited to THICK parts with a means to complete PACK in the Mold.

I have adding mold melt "PACK" volumteric make up and reduce "shrink" by:

1. Core Pin as a Plunger in the sprue puller - problem with gate size for balanced "INPUT"

2. Collapsible Cavity to build accept added melt volume and post PACK compression  

3. Side Pocket with a gate into a plunger area made up on the parting line.

4. Looking at a 40 second cycle is long. We are in 24 - 36 - 48 - 64 - 96 - 128 cavity clossure tops and bottoms with 15 - 25 second cycles.

Tim
User Rank
Platinum
Question on dosing
Tim   10/31/2011 9:35:31 PM
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I am a little confused on how this technology is used especially in regards to the moving side mold cylinder.  Where does the dosed melt cushion come from on the moving side of the mold.  I can sort of understand adding material through the hot runner, but this is still hard to grasp.  In most injection molding applications, all of the fill, pack, and hold pressures are applied by the injection screw.  The length of time for pack and hold are determined by the gate freeze off time.  Some better description of what this technology does would help in applying it.

williamlweaver
User Rank
Platinum
The Price to Upgrade
williamlweaver   10/31/2011 9:53:03 AM
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Like most innovations, the total cost of adoption is based on the predicted savings and the cost to upgrade. 30% time savings is really attractive in a high-volume process, but that will be balanced by the cost to modify or replace the existing tools. I'm going to guess that DuPont has done their homework and charted a path that includes the cost of tool upgrades. Otherwise this innovation will take a large time to permeate production floors as they replace older equipment or build new lines.

Beth Stackpole
User Rank
Blogger
Double duty to the rescue
Beth Stackpole   10/31/2011 8:01:57 AM
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Seems like a really promising technology and one that could have significant ramifications for manufacturers given the widespread use of injection molding in production. Is this a technology experiment or is DuPont further along in terms of trials or early use case testing, or perhaps even gearing up to commercialize the technology?



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