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thermoplastic compression molding

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Published: 01 January 2001
Fig. 7 Schematic of thermoplastic compression molding with molding compound. GMT, glass-mat reinforced thermoplastics More
Image
Published: 01 November 1995
Fig. 7 Thermoplastic compression molding. (a) Heated blank loaded into mold. (b) Mold closing, compressing material to fill cavity More
Image
Published: 01 January 2001
Fig. 2 Typical glass-mat thermoplastic (GMT) compression molding production line More
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003019
EISBN: 978-1-62708-200-6
... and processing parameters of SMC components, providing details on tooling and process advantages and limitations. The article provides a general overview of the types of compression molding processes, including structural compression molding and thermoplastic compression molding. compression molding sheet...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003419
EISBN: 978-1-62708-195-5
..., diaphragm forming, compression molding, roll forming, bladder molding, liquid molding, filament winding, and pultrusion. thermoplastic composites composite consolidation autoclave molding diaphragm forming compression molding roll forming bladder molding liquid molding filament winding...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003415
EISBN: 978-1-62708-195-5
... materials, namely, glass-fiber-mat-reinforced thermoplastics, long-fiber-reinforced thermoplastics, and sheet molding compounds. The article also presents information on the application examples and market volume of compression molding. compression molding automotive composite applications composite...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003016
EISBN: 978-1-62708-200-6
... in the closed mold is usually less than two times the parison wall thickness in order to push some of the material back into the weld area. Compressing the flash also helps cool it by reducing the thickness. However, because most engineering thermoplastics have a higher viscosity than polyolefins, the amount...
Image
Published: 01 January 2001
Fig. 1 Schematic of types of flows expected in composites processing. (a) Short-fiber suspension manufacturing methods: flow of resin-fiber suspension in a mold or through a die. Examples are injection molding, compression molding, and extrusion. (b) Squeeze flow manufacturing methods More
Book Chapter

Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003370
EISBN: 978-1-62708-195-5
... of an injection molding screw is complex and involves two key factors: the length and the compression ratio. Fig. 7 Injection molding compound screws Short screws are recommended for heat-sensitive thermosetting injection molding compounds. Longer screws are needed for thermoplastic molding...
Book Chapter

Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003786
EISBN: 978-1-62708-177-1
... on compression molded mounts, which are molded with thermoplastic and thermosetting resins. The article reviews several resins and their key factors, which help in the selection of the most appropriate mounting method and resin. It also discusses the characteristics of plastic mounting materials. The article...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006935
EISBN: 978-1-62708-395-9
... of materials available, the overlap of performance among different processes is considerable. A compression-molded continuous-glass-reinforced thermoset could, for example, have a lower flexural modulus than an injection-molded unreinforced thermoplastic, depending on the choice of polymer. Process...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003014
EISBN: 978-1-62708-200-6
... resistance. The machine and molds are very similar to those used for thermoplastic injection molding, with the following exceptions discussed below. First, shear on the material in the barrel is kept to a minimum to prevent overheating and thus precuring. The screw compression ratio is kept very low...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003471
EISBN: 978-1-62708-195-5
... recycling processes Process Feedstock Recycled products Regrind/compression molding (Ref 17 , 18 , 19 , 20 , 21 , and 22 ) Short- or long-fiber thermoplastic composites Flake for use in compression molding Regrind/extrusion-injection molding (Ref 17 , 18 , 19 , 20 , 21 , and 22...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003020
EISBN: 978-1-62708-200-6
... that the mold, unlike a compression mold or thermoplastic stamping mold, is completely closed to defined stops prior to final part formation. This provides more reproducible part thickness and tends to minimize trimming and deflashing of the final part. Using a reinforcement preform allows the preplacement...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003447
EISBN: 978-1-62708-195-5
... are resin-to-fiber ratio, resin and fiber types, resin-fiber interface, type of composite processing (filament winding, tape wrapping, or molding), and type of composite cure (autoclave, hydroclave, vacuum bag molding, extrusion, or compression or injection molding). In addition, these observations...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003032
EISBN: 978-1-62708-200-6
... that affect mechanical properties are resin-to-fiber ratio, resin and fiber types, resin-fiber interface, type of composite processing (filament winding, tape wrapping, or molding), and type of composite cure (autoclave, hydroclave, vacuum bag molding, extrusion, or compression or injection molding...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006870
EISBN: 978-1-62708-395-9
... length (>100%) and return very close to their original shape. Metals and thermoplastics typically show elongations of <50% with permanent deformation and little or no recovery of their original dimensions. When deformed in compression mode, elastomers can also maintain a tendency to recover...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006864
EISBN: 978-1-62708-395-9
..., and pressure vessels. With pressure vessels, the mandrel cannot be removed from inside the part; instead, it becomes the inner surface. With thermoplastics, filament winding is often the first fiber-placement stage before compression molding. Most shapes can be produced with sophisticated equipment, provided...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003010
EISBN: 978-1-62708-200-6
... temperature at ambient pressure. In certain applications, however, engineering thermoplastics are preferred. They have an advantage in large-volume production processes in which molding time is critical because they merely need to be heated, shaped, and cooled, while thermosets must also undergo curing...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003009
EISBN: 978-1-62708-200-6
... Abstract Advanced thermoplastics are stiff, moldable plastics that compete with traditional engineering thermoplastics and thermosets owing to their good tensile, compressive, impact, and shear strength, electrical properties, and corrosion resistance. This article discusses commercial forms...