Subject:
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Re: LEGO Inside Tour (New theory on color change: stock dyes)
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Newsgroups:
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lugnet.color
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Date:
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Wed, 25 Aug 2004 01:45:41 GMT
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Viewed:
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848 times
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Jake says Lego is not using “just in time” coloring in response to the rumor,
and Scott says it doesn’t make sense.. however, the technology is real:
“Chroma Injecta Color Systems Inc of Chicago Heights, Illinois, have developed
what is claimed to be a highly effective liquid colorant system for PET and its
derivatives. PET liquid colorants have been specially formulated to protect the
resin’s intrinsic viscosity and support the unique characteristics that have
contributed to its success as a packaging material. Among the advantages of the
new colorants the manufacturer points to the cost savings generated by superior
colour dispersion and lower let down ratios, the elimination of the need to buy
and stock pre-coloured resins and the increased productivity offered by more
efficient colour changes. Chroma’s colour concentrates have no prior heat
history, which assures maximum physical integrity of the moulded product.”
Normally, to color ABS or other thermoplastics you melt clear resin, mix in
colorants and other additives (like UV blocker), then extrude the product
through a chilling bath and into a chopping machine which pelletizes it. Then
the molding machine does frightening things to the pellets to get them into the
mold. This is the aforementioned “heat history”. There is some quality advantage
to be achieved by eliminating processing steps which degrade the plastic each
time.
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