Diamond Systems Tritan Guía para resolver problemas descargar pdf (Pagina 33)

Production molding

Production start-up

The processing window needs to be deﬁned to establish a

controlled molding process. The starting point for a production

run is typically the same as the conditions used in the last

molding trial or start-up run. The machine should be cleaned

before production is started. After the window is deﬁned,

routine production operations should be set in the middle of the

window so that normal variability does not result in scrap parts.

Cycle uniformity or rhythm

To maintain shot-to-shot consistency, it is best to maintain

a constant cycle. With manual part removal (semiautomatic

operation), a good rhythm should be established to maintain a

constant time in the barrel from shot to shot.

Scrap minimization

To minimize scrap, ﬁrst determine the sources of scrap. Next,

attempt to correct the largest sources ﬁrst. Form 3 is provided

as a tool for deﬁning the problems that are causing scrap. After

the cause is determined, refer to the “Troubleshooting guide” on

page 39 for suggested solutions to various problems.

Use of regrind

It is generally suggested that the regrind feeding rate be kept to

20% or less. This will help maximize part quality.

The quality of the regrind is as important as the quality of the

virgin material.

Regrind should be:

• Kept free of contamination

• Ground with sharp grinders to minimize ﬁnes and overheating

• Dried

• Fed at a constant ratio

Some typical sources of contamination include:

• Hot stamping

• Heat transfer tape

• Contaminated parts

• Purging

Shutdown

In general, the feed can be shut off and molding continued on

cycle until the screw is run dry. If you are changing to another

material, purge with polycarbonate, acrylic, styrene, or

commercial purge compound, run the screw dry, and turn off

the power.

ALWAYS LEAVE THE SCREW FORWARD; otherwise, a large slug

of material must be remelted. If the slug does not fully melt

before the screw is injected forward, check ring damage may

result.

Packaging and part handling

Parts with a high-gloss surface need to be protected from being

scratched, dented, or otherwise damaged during handling.

Packaging should be planned to protect the high-gloss ﬁnish of

Eastman

™

polymers.

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 43 44

Comentarios a estos manuales

Sin comentarios

Diamond Systems Tritan Guía para resolver problemas Pagina 33

Comentarios a estos manuales

Relacionado con productos y manuales para Cajas eléctricas Diamond Systems Tritan