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vacuum-assisted resin transfer molding

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Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003398
EISBN: 978-1-62708-195-5
... commercial parts Small enclosures and keyboards Vacuum-assisted resin transfer molding Room-temperature process Large parts High quality Low cost Extensively used for Navy applications Large electronic equipment enclosures, operator consoles, etc. Compression molding High-cost tooling High quality...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0009071
EISBN: 978-1-62708-177-1
... transfer molding, vacuum-assisted resin transfer molding, and resin film infusion. It explains the composite- and matrix-toughening methods for fiber-reinforced composites, such as dispersed-phase toughening and interlayer toughening. The article concludes with information on optical microscopy, which...
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
... to produce structures. The techniques include vacuum-assisted resin injection, vacuum infusion, resin-film infusion, and injection-compression molding. The article provides an overview of the materials that are commonly used together with some of processing characteristics that are important to processing...
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
... the material cost of prepregs while still providing the desired precise resin content. Personnel are still needed to locate the material in the mold, ensure the reinforcement is completely saturated, and apply the vacuum bag. Vacuum-assisted resin transfer molding involves liquid resin being drawn through...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003431
EISBN: 978-1-62708-195-5
... focus on next-generation composite processing affordability, out-of-autoclave curing has become a common goal. Processes such as vacuum-assisted resin transfer molding, resin transfer molding, electron beam curing, room- temperature curing, oven curing, and resin-fiber infusion are being adopted to meet...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003432
EISBN: 978-1-62708-195-5
...) or to infiltrate a fiber preform via resin transfer molding, vacuum assisted resin transfer molding, or resin film infusion. Testing on the resin blends are performed by either the resin manufacturer or the end user. Since each component of a resin system contributes to the final properties of the composite...
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
... much material can be applied without significant degradation of mechanical properties caused by exceeding out-time and shelf-life limits. However, there are manufacturing processes and materials well suited for long assembly times. Many of the closed-mold processes, vacuum-assisted resin- transfer...
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.a0003367
EISBN: 978-1-62708-195-5
..., and syntactic core materials. They can be consolidated using autoclave, vacuum bag, press, pultrusion, RTM, Seemans composite resin injection molding process, or vacuum-assisted resin transfer molding methods. Curing of CE resins and prepregs is generally performed at elevated temperatures. Low-temperature...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003453
EISBN: 978-1-62708-195-5
... polyurethene adhesive. Additional shells can be bonded over the first bonded shell to achieve the desired thickness. Hardshell structures are prefabricated E- glass/vinyl ester shells manufactured by the vacuum-assisted resin transfer molding process with a fiber volume of about 60%. The shells can...
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
... and multiaxial Min Max Min Max Min Max Spray-up 10 20 … … … … Hand lay-up 10 20 25 40 40 50 Vacuum infusion 20 30 40 50 50 65 Resin transfer molding 20 30 40 50 50 65 Prepreg compression molding … … 40 55 50 70 Filament winding … … … … 50 70...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003018
EISBN: 978-1-62708-200-6
..., causing the sheet to billow upward. The plug assist pushes the sheet into the cavity, and vacuum is applied to transfer the sheet from the plug to the mold surface. Because it affords control of material distributions, this is currently the most popular technique for making deep-drawn containers...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003350
EISBN: 978-1-62708-195-5
...-assisted resin transfer molding, vacuum can be applied to the vent ports to assist in drawing the resin into the fiber preform and removing any trapped air. There are many variations of the resin infusion process. For example, for cost reduction, molds can contain a single-sided hard tool side, where...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003020
EISBN: 978-1-62708-200-6
... O-rings will be needed to contain resin. A common process sometimes referred to as resin transfer molding is the vacuum-assisted resin injection process currently used to manufacture specialty automobiles ( Ref 7 ). As currently practiced, the process uses epoxy tooling similar to high-quality...
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
.... Resin transfer molding (RTM) is a matched-mold process that uses low-cost molds. The reinforcement is laid up dry in the mold, and liquid-catalyzed resin is pumped in until the mold is filled and the pressure reaches about 170 kPa (25 psi). The process can be vacuum assisted (VARTM) to prevent trapped...
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
...-sheet pattern lay-up is resin transfer molded with resin or carbon CVD densification that is carbonized/graphitized and repeat cycled to the density goal. Alternatively, a fiber preform is placed in a closed chamber and vacuum-pressure resin impregnated, cured, carbonized three to eight times...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003404
EISBN: 978-1-62708-195-5
..., it usually costs less and takes less time to produce a metal- faced mold by electroforming an approximately 5 mm (0.2 in.) thick metal shell, mounting the shell to a support structure, and adding heating/ cooling lines, vacuum systems, and ejectors (if required) than machining a mold. It is possible using...
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
... (polyester resin, chopped strand mat and woven rovings, hand laminating), to elevated- temperature cure, vacuum consolidation, and unidirectional prepreg tapes with honeycomb cores. Most custom or one-off builders use epoxy-resin systems with some form of vacuum- assisted consolidation to reduce resin...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005249
EISBN: 978-1-62708-187-0
.... Because of this low permeability, either vacuum assist or pressure is usually required for the pouring of molds. Simple gravity pouring is rarely done. Most foundries use vacuum assist for pouring conventional plaster molds. A typical setup for vacuum-assist pouring is shown schematically in Fig. 5...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003397
EISBN: 978-1-62708-195-5
... processes to tool production. One example is SLS of epoxy-infiltrated metal molds ( Ref 29 ). Freeform fabrication may also be used to produce tools for a large number of “half-mold” processes including hydroforming, diaphragm forming, vacuum forming, resin- transfer molding, manual/mechanically-assisted...