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vacuum bag molding

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Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003036
EISBN: 978-1-62708-200-6
...Abstract Abstract Wet lay-up using hand or spray techniques is one of the simplest methods of combining a fiber reinforcement with a solidifying resin to form a composite structure. This article describes several wet lay-up processes - including contact molding, spray molding, vacuum bag...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003041
EISBN: 978-1-62708-200-6
...Abstract Abstract Autoclave molding is a process used to impart a controlled heat and pressure cycle cure to a layup. This article describes the materials used for preparing a layup, including peel ply, separator, bleeder, barrier, breather, dam, and vacuum bag. It describes the major elements...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003405
EISBN: 978-1-62708-195-5
... debulking cycles of resin transfer molding (RTM) preforms. The preforms are debulked to eliminate excess bulk so they can be easily loaded in the matched-mold RTM tool. Conventional vacuum bags pull preforms too tight around the corners of debulking mandrels, which, combined with the increased bag pressure...
Book Chapter

By Greg Kress
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003392
EISBN: 978-1-62708-195-5
... methods: Wet lay-up, prepreg lay-up, fiber placement, tape lay-up, pultrusion, resin transfer molding (RTM), vacuum- assisted resin transfer molding, filament winding, compression molding, injection molding, centrifugal casting Processing equipment: Vacuum bagging, molds, ovens, autoclaves, presses...
Book Chapter

Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003412
EISBN: 978-1-62708-195-5
... and circulate it uniformly within the vessel, a subsystem to pressurize the gas stream, a subsystem to apply vacuum to parts covered by a vacuum bag, a subsystem to control operating parameters, and a subsystem to load the molds into the autoclave. Pressure Vessel The pressure vessel shell provides...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.9781627081955
EISBN: 978-1-62708-195-5
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003467
EISBN: 978-1-62708-195-5
... to the materials supplier, resins used in the manufacture of this particular spar generally were formulated for use in autoclave or press molding. However, the manufacturer noted that composites were successfully processed using this resin and vacuum bag molding techniques, stressing that the component must...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003407
EISBN: 978-1-62708-195-5
... overlaps. Debulking is also commonly required during the lamination process. These factors usually result in greater labor costs and higher use of materials, such as vacuum bagging consumables. Fig. 8 Prepreg hull on male mold prior to consolidation The requirements of tooling for the hull...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003403
EISBN: 978-1-62708-195-5
...-up” materials and processes are still used for many other applications. Modern lay-up methods and vacuum bagging techniques can be employed with long pot-life resins to achieve acceptable tool laminates. Many of the wet lay-up methods and techniques parallel those used to fabricate prepreg tooling...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003414
EISBN: 978-1-62708-195-5
... in the technology have shown that vacuum infusion can also be an alternative to prepreg compression molding and prepreg vacuum bagging. When choosing the most cost-efficient manufacturing technology for a certain part several criteria play a role. Important criteria are: The number of parts (production...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003409
EISBN: 978-1-62708-195-5
... not require shimming during assembly. The process-engineering simplicity of prepreg lay-up and cure using a vacuum bag and/ or pressure is undeniably preferable to liquid molding processes. The downside of freezer storage and high prepreg cost if procuring small quantity continues to be overcome...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006053
EISBN: 978-1-62708-175-7
..., and injection molding. Processes such as uniaxial pressing and CIP are performed using powders directly from spray drying or vacuum drying, whereas processes such as extrusion and injection molding require addition of binders after drying. The goal of green shaping is to form dry powder into desired shapes...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003413
EISBN: 978-1-62708-195-5
... Disadvantages of liquid molding Versus open mold/wet laminating Reduction/elimination of VOC emissions Improved uniformity, quality assurance Two cosmetic faces Reduced labor costs Higher investment costs–tooling and equipment Versus prepreg processing/vacuum bag and autoclave Reduced...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003434
EISBN: 978-1-62708-195-5
... drinking fountains. Portable vacuum systems must be approved and have special filters if outlets are within the controlled area. During controlled-contamination-area shutdowns, uncured parts, prepreg, and film adhesive materials are placed in a sealed bag and stored in the freezer or in the controlled...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003053
EISBN: 978-1-62708-200-6
.... These are especially important parameters for automated uniaxial pressing and dry bag isostatic pressing, because it is difficult to externally assist the packing of the dies prior to compression. Wet bag isostatic pressing molds and hot press dies are normally filled manually, independent from the machines...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003395
EISBN: 978-1-62708-195-5
... of the closed-mold processes, vacuum-assisted resin- transfer molding (VARTM), or structural reaction injection molding (SRIM), when used with preforms, can result in reduced handling time of the resin. The dry reinforcement is placed in the desired orientation, and then the resin is introduced. The ability...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006074
EISBN: 978-1-62708-175-7
... to 65% of theoretical, a nominal range for uncompacted powder, to 75 to 85% of the 100% theoretical density value of the metal being processed. There are two variations of the CIP process depending on the way the elastomer mold is utilized. In the “dry-bag” process, the elastomer mold is fixed...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002492
EISBN: 978-1-62708-194-8
... a combination fiber chopper and spray gun. The chopped roving and liquid resin are sprayed on the mold surface to build up the required wall thickness. Curing under pressure can be achieved by placing pressure bags over the surface of the molding. Filament Winding Filament winding is used...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.9781627082006
EISBN: 978-1-62708-200-6
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002465
EISBN: 978-1-62708-194-8
... to structural shape As molded and surface coated Hot press/diffusion bond Hot, mold of metal/reinforced fiber Aluminum, titanium, or stainless steel foil or thin sheet Glass, carbon, boron, graphite depending on metal melt temperature Mold temperature pressure/inside sealed vacuum retort Machine...