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SOLIDWORKS SOLIDWORKS Plastics. Dassault Systèmes SolidWorks Corporation 175 Wyman Street Waltham, MA U.S.A.

SOLIDWORKS® 2015
SOLIDWORKS Plastics
Dassault Systèmes SolidWorks Corporation
175 Wyman Street
Waltham, MA 02451 U.S.A.
© 1995-2014, Dassault Systèmes SolidWorks Corporation, a
Dassault Systèmes S.A. company, 175 Wyman Street, Waltham,
Mass. 02451 USA. All Rights Reserved.
The information and the software discussed in this document are
subject to change without notice and are not commitments by
Dassault Systèmes SolidWorks Corporation (DS SolidWorks).
No material may be reproduced or transmitted in any form or by
any means, electronically or manually, for any purpose without
the express written permission of DS SolidWorks.
The software discussed in this document is furnished under a
license and may be used or copied only in accordance with the
terms of the license. All warranties given by DS SolidWorks as
to the software and documentation are set forth in the license
agreement, and nothing stated in, or implied by, this document or
its contents shall be considered or deemed a modification or
amendment of any terms, including warranties, in the license
agreement.
Patent Notices
SOLIDWORKS® 3D mechanical CAD software is protected by
U.S. Patents 5,815,154; 6,219,049; 6,219,055; 6,611,725;
6,844,877; 6,898,560; 6,906,712; 7,079,990; 7,477,262;
7,558,705; 7,571,079; 7,590,497; 7,643,027; 7,672,822;
7,688,318; 7,694,238; 7,853,940; 8,305,376; 8,581,902, and
foreign patents, (e.g., EP 1,116,190 B1 and JP 3,517,643).
eDrawings® software is protected by U.S. Patent 7,184,044;
U.S. Patent 7,502,027; and Canadian Patent 2,318,706.
U.S. and foreign patents pending.
Trademarks and Product Names for SOLIDWORKS
Products and Services
SOLIDWORKS, 3D ContentCentral, 3D PartStream.NET,
eDrawings, and the eDrawings logo are registered trademarks
and FeatureManager is a jointly owned registered trademark of
DS SolidWorks.
CircuitWorks, FloXpress, PhotoView 360, and TolAnalyst are
trademarks of DS SolidWorks.
FeatureWorks is a registered trademark of Geometric Ltd.
SOLIDWORKS 2015, SOLIDWORKS Enterprise PDM,
SOLIDWORKS Workgroup PDM, SOLIDWORKS Simulation,
SOLIDWORKS Flow Simulation, eDrawings, eDrawings
Professional, SOLIDWORKS Sustainability, SOLIDWORKS
Plastics, SOLIDWORKS Electrical, and SOLIDWORKS
Composer are product names of DS SolidWorks.
Other brand or product names are trademarks or registered
trademarks of their respective holders.
COMMERCIAL COMPUTER SOFTWARE - PROPRIETARY
The Software is a “commercial item” as that term is defined at 48
C.F.R. 2.101 (OCT 1995), consisting of “commercial computer
software” and “commercial software documentation” as such
terms are used in 48 C.F.R. 12.212 (SEPT 1995) and is provided
to the U.S. Government (a) for acquisition by or on behalf of
civilian agencies, consistent with the policy set forth in 48 C.F.R.
12.212; or (b) for acquisition by or on behalf of units of the
Department of Defense, consistent with the policies set forth in
48 C.F.R. 227.7202-1 (JUN 1995) and 227.7202-4 (JUN 1995).
In the event that you receive a request from any agency of the
U.S. Government to provide Software with rights beyond those
set forth above, you will notify DS SolidWorks of the scope of
the request and DS SolidWorks will have five (5) business days
to, in its sole discretion, accept or reject such request. Contractor/
Manufacturer: Dassault Systèmes SolidWorks Corporation, 175
Wyman Street, Waltham, Massachusetts 02451 USA.
Copyright Notices for SOLIDWORKS Standard, Premium,
Professional, and Education Products
Portions of this software © 1986-2014 Siemens Product
Lifecycle Management Software Inc. All rights reserved.
This work contains the following software owned by Siemens
Industry Software Limited:
D-Cubed™ 2D DCM © 2014. Siemens Industry Software
Limited. All Rights Reserved.
D-Cubed™ 3D DCM © 2014. Siemens Industry Software
Limited. All Rights Reserved.
D-Cubed™ PGM © 2014. Siemens Industry Software Limited.
All Rights Reserved.
D-Cubed™ CDM © 2014. Siemens Industry Software Limited.
All Rights Reserved.
D-Cubed™ AEM © 2014. Siemens Industry Software Limited.
All Rights Reserved.
Portions of this software © 1998-2014 Geometric Ltd.
Portions of this software incorporate PhysX™ by NVIDIA 20062010.
Portions of this software © 2001-2014 Luxology, LLC. All rights
reserved, patents pending.
Portions of this software © 2007-2014 DriveWorks Ltd.
Copyright 1984-2010 Adobe Systems Inc. and its licensors. All
rights reserved. Protected by U.S. Patents 5,929,866; 5,943,063;
6,289,364; 6,563,502; 6,639,593; 6,754,382; Patents Pending.
Adobe, the Adobe logo, Acrobat, the Adobe PDF logo, Distiller
and Reader are registered trademarks or trademarks of Adobe
Systems Inc. in the U.S. and other countries.
For more DS SolidWorks copyright information, see Help >
About SOLIDWORKS.
Copyright Notices for SOLIDWORKS Simulation Products
Portions of this software © 2008 Solversoft Corporation.
PCGLSS © 1992-2014 Computational Applications and System
Integration, Inc. All rights reserved.
Copyright Notices for SOLIDWORKS Enterprise PDM
Product
Outside In® Viewer Technology, © 1992-2012 Oracle
© 2011, Microsoft Corporation. All rights reserved.
Copyright Notices for eDrawings Products
Portions of this software © 2000-2014 Tech Soft 3D.
Portions of this software © 1995-1998 Jean-Loup Gailly and
Mark Adler.
Portions of this software © 1998-2001 3Dconnexion.
Portions of this software © 1998-2014 Open Design Alliance.
All rights reserved.
Portions of this software © 1995-2012 Spatial Corporation.
The eDrawings® for Windows® software is based in part on the
work of the Independent JPEG Group.
Portions of eDrawings® for iPad® copyright © 1996-1999
Silicon Graphics Systems, Inc.
Portions of eDrawings® for iPad® copyright © 2003 – 2005
Apple Computer Inc.
Document Number: PMT1539-ENG
Contents
Introduction
About This Course . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Course Design Philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Using this Book . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
About the Training Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Windows® 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Conventions Used in this Book . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Use of Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Lesson 1:
Basic Flow Analysis
Basic Flow Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Element Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Shell Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Solid Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Meshing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Initial Mesh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
The PlasticsManager Tree. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Input Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Polymer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Using the Databases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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SOLIDWORKS 2015
Injection Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Running a Flow Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Pack. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Warp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Flow Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Fill Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Weld Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Results Adviser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Exercise 1: Basic Flow Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Lesson 2:
Detecting Air Traps
Detecting Air Traps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Adding Nodes to the Mesh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Air Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Dieseling Effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Time Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Switching Modes for Design Changes . . . . . . . . . . . . . . . . . . . . . . . . 33
Plastics to Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Modeling to Plastics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Thickness Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Design Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Parts Created Using Mold Design Tools. . . . . . . . . . . . . . . . . . . . . . . 38
Exercise 2: Air Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Exercise 3: Design Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Lesson 3:
Detecting a Short Shot
Detecting Short Shots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Fill Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Filling Time and Injection Pressure . . . . . . . . . . . . . . . . . . . . . . . 47
Report Text File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Flow Front Central Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Pressure at End of Fill. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Thickness Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Exercise 4: Short Shots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
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Lesson 4:
The Model Manager
The Model Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Using the Model Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Copying Parts and Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Batch Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Batch Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Settings for Batch Analysis Jobs . . . . . . . . . . . . . . . . . . . . . . . . . 64
Summary and Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Lesson 5:
Injection Locations and Sink Marks
Injection Locations and Sink Marks . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Injection Location Rules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Positioning the Injection Location . . . . . . . . . . . . . . . . . . . . . . . . 71
Single vs. Multiple Injection Locations . . . . . . . . . . . . . . . . . . . . 72
Modeling for Injection Locations . . . . . . . . . . . . . . . . . . . . . . . . . 72
Automatic Injection Location Selection . . . . . . . . . . . . . . . . . . . . 73
Sink Marks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Measure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Minimizing Sink Marks in Ribs . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Nominal Wall Thickness Advisor. . . . . . . . . . . . . . . . . . . . . . . . . 78
Exercise 5: Minimizing Sink Marks (1) . . . . . . . . . . . . . . . . . . . . . . . 79
Exercise 6: Minimizing Sink Marks (2) . . . . . . . . . . . . . . . . . . . . . . . 83
Lesson 6:
Multiple Cavity Molds
Multiple Cavity Molds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Mirroring Cavities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Sketching Runners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Mold Layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Runner Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Runner Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Element Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Runner Design Wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Searching for Polymers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Pressure at End of Fill. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Results Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
X-Y Plots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Exercise 7: Multiple Cavity Molds. . . . . . . . . . . . . . . . . . . . . . . . . . 101
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Lesson 7:
Runner-Balancing
Runner-Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Local Refinement of Mesh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Mesh Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Gradation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Material Favorites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Using Runner-Balancing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Exercise 8: Runner-Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Lesson 8:
Gate Freeze
Gate Freeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Solid Mesh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Solid and Shell Mesh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Solid Mesh Runner Creation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Transforming the Mesh. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Meshing Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Pack Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Flow and Pack Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Pack Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Pressure at End of Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Temperature at End of Packing . . . . . . . . . . . . . . . . . . . . . . . . . 132
Volumetric Shrinkage at End of Packing . . . . . . . . . . . . . . . . . . 133
Editing the Gate Geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Exercise 9: Gate Freeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Lesson 9:
Symmetry Analysis
Symmetry Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Case Study1: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Case Study2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Lesson 10:
Optimizing Cooling Time
Optimizing Cooling Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Multiple Injection Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Temperature at Post-Filling End. . . . . . . . . . . . . . . . . . . . . . . . . 156
Nodal Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Clipping Plane Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Jetting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Exercise 10: Optimizing Cooling Time . . . . . . . . . . . . . . . . . . . . . . 165
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Lesson 11:
Using Inserts
Using Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Cavities and Inserts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Materials for Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Insert Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Hiding Cavities and Inserts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Lesson 12:
Mesh Repairs
Mesh Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Element Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Edit Mesh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Repairing Mesh Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Using Fill Hole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Exercise 11: Mesh Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Lesson 13:
Warpage Analysis
Warpage Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Shrinkage and Warpage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
Minimizing Warpage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
Warp Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Flow, Pack and Warp Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Fiber Orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Residual Stress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Warp Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Lesson 14:
Cooling Analysis
Cooling Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Stages in the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Cooling Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
Cool Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Cool Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
Cool Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
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