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 |  موضوع: كتاب Troubleshooting Injection Moulding الجمعة 06 سبتمبر 2019, 5:10 pm | |
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Troubleshooting Injection Moulding
An Arburg Guide
Vannessa Goodship
(Warwick Manufacturing Group)
Edited by V. Goodship
Volume 15, Number 4
و المحتوى كما يلي :
Contents
1. Introduction 5
1.1 Optimising the Moulding Part 5
2. Detection, Classification and Troubleshooting Defects 5
2.1 Classification 5
2.2 Flow Charts for Troubleshooting 5
2.3 Sink Marks 6
2.3.1 Physical Cause 6
2.3.2 Correcting Sink Marks . 6
2.4 Streaks . 6
2.4.1 Burnt Streaks (Brown or Silver) . 8
2.4.2 Moisture Streaks . 10
2.4.3 Colour Streaks .11
2.4.4 Air Streaks/Air Hooks 12
2.4.5 Glass Fibre Streaks . 15
2.5 Gloss/Gloss Differences . 16
2.5.1 Physical Cause 16
2.5.2 Correcting Gloss/Gloss Differences . 17
2.6 Weld Line (Visible Notch or Colour Change) 18
2.6.1 Physical Cause 18
2.6.2 Improving a Weld Line (Visible Notch or Colour Change) . 18
2.7 Jetting 18
2.7.1 Physical Cause 18
2.7.2 Correcting Jetting . 21
2.8 Diesel Effect (Burns) 21
2.8.1 Physical Cause 21
2.8.2 Correcting Diesel Effect (Burns) 23
2.9 Record Grooves Effect 23
2.9.1 Physical Cause 23
2.9.2 Correcting Record Grooves Effect . 24
2.10 Stress Whitening/Stress Cracks 25
2.10.1 Physical Cause 25
2.10.2 Correcting Stress Whitening/Stress Cracks . 26
2.11 Incompletely Filled Parts 26
2.11.1 Physical Cause 27
2.11.2 Correcting Incompletely Filled Parts . 27
2.12 Oversprayed Parts (Flashes) . 27
2.12.1 Physical Cause 27
2.12.2 Correcting Oversprayed Parts (Flashes) .
29 Troubleshooting Injection Moulding
2.13 Visible Ejector Marks . 29
2.13.1 Physical Cause 30
2.13.2 Correcting Visible Ejector Marks . 30
2.14 Deformation During Demoulding 30
2.14.1 Physical Cause 30
2.14.2 Correcting Deformation During Demoulding 32
2.15 Flaking of the Surface Layer 32
2.15.1 Physical Cause 32
2.15.2 Correcting Flaking of the Surface Layer 32
2.16 Cold Slugs/Cold Flow Lines . 32
2.16.1 Physical Cause 32
2.16.2 Correcting Cold Slug/Cold Flow Lines 34
2.17 Entrapped Air (Blister Formation) 34
2.17.1 Physical Cause 34
2.17.2 Correcting Entrapped Air (Blister Formation) . 36
2.18 Dark Spots . 36
2.18.1 Physical Cause 36
2.18.2 Correcting Dark Spots 36
2.19 Dull Spots Near the Sprue 38
2.19.1 Physical Cause 38
2.19.2 Correcting Dull Spots Near the Sprue 38
3. Case Studies of Injection Moulded Components 39
3.1 Threaded Connecting Sleeves for Ink Drafting Apparatus 39
3.2 Meter Cases . 39
3.3 Wristwatch Glass 39
3.4 Alarm Clock Glass 39
3.5 Glass Cover for Digital Gauge . 39
3.6 Plug Boards with Insert Pins 40
4. Effects of Injection Moulding Parameters 40
4.1 Internal Mould Temperature and Pressure 40
4.2 Relationship of Injection and Mould Cavity Pressures 41
4.3 Injection Pressure and Injection Time 42
4.4 Filling Speed . 43
4.5 Filling Speed and Orientation . 43
4.6 Effects of Too High Filling Speed 44
5. Machine Specifications 44
5.1 Clamp Force 44
5.2 Injection Unit
44 Troubleshooting Injection Moulding
The views and opinions expressed by authors in Rapra Review Reports do not necessarily reflect those of
Rapra Technology Limited or the editor. The series is published on the basis that no responsibility or
liability of any nature shall attach to Rapra Technology Limited arising out of or in connection with any
utilisation in any form of any material contained therein.
5.3 Feeding Hopper . 46
5.4 Barrel Residence Time 46
5.5 Precompression of the Melt 46
5.6 Check Valve 47
5.7 The Nozzle 47
5.8 The Feed System . 47
5.9 The Mould Temperature . 47
5.10 The Importance of Adequate Venting . 49
5.11 Multi-Cavity Moulds 49
5.12 General Information on Wear and Tear 49
6. Conclusion 49
Abbreviations and Acronyms . 50
Abstracts from the Polymer Library Database 51
Subject Index . 123
Company Index.
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