关于名胜古迹的作文key to your success
I. Injection molding faults
1. Streaks
1.1 Moisture streaks/splay marks 1.2 Burning streaks/silver streaks 1.3 Dark streaks due to indrawn air 1.3 Color streaks
2. Peeling/delamination
3. Weld lines
怎么培养表达能力
4. Air entrapments/bubble formation
5. Sink marks
listen to this6. Voids
7. Glossy spots or differences in gloss/mat spots 8. Microcracks, crazing, stress whitening 9. Diel effect
10. Demolding problems
11. Push marks (“tiger stripes/tiger lines”)12. Record effect 13. Short shot
14. Flash formation 15. Jetting 16. Cold slug 17. Warpage
II. Overview: Control of injection molding
faults by changing the processing parameters
4只要人人都献出一点爱
nc是什么意思81012141618202224262830323440
2
Introduction
Plastic moldings produced by the injection molding
2013年英语四级成绩查询
process are usually long-lived consumer goods
who suitability for the purpo in question depends
not only on the properties of the finished part but
also highly on the surface quality. The complex inter-
play among molding and mold design, processing
conditions for the raw material and the parameters
for the actual process require a great deal of experi-ctt
ence for optimum results especially when focusing
on the short-term removal of processing faults. On
the basis of an individual ca a decision has to be
taken as to whether simple and rapid fault correction
(by modifying the processing parameters for example)
is possible or whether intervention in the design of
the parts or the layout of the mold and gating is
necessary.
In conclusion the surface faults occurring most com-
monly in styrene copolymers are noted and described
and recommendations for their removal are t out.
3
I. Injection molding faults
1. Streaks
1.1 Moisture streaks/splay marks
sottile
太空漫步者1.2 Burning streaks/silver streaks
4
1.1 Moisture streaks
1.2 Burning streaks
Fig. 1.1.1: Streaks due to an exces-sively high mois-ture content in the
granules
Fig. 1.1.2: Section through a torn streak; transmitted light, magnification 80:1
Fig. 1.2.1: Silvery surface streaks
Fig. 1.2.2: Black discolorations on a transparent part
Sprue
5
>coido
