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Book Chapter
Molding Compounds
Available to PurchaseBook: Composites
Series: ASM Handbook Archive
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003370
EISBN: 978-1-62708-195-5
... Abstract Molding compounds are plastic materials in varying stages of pellets or granulation that consist of resin, filler, pigments, reinforcement, plasticizers, and other ingredients ready for use in a molding operation. This article describes the material components and physical properties...
Abstract
Molding compounds are plastic materials in varying stages of pellets or granulation that consist of resin, filler, pigments, reinforcement, plasticizers, and other ingredients ready for use in a molding operation. This article describes the material components and physical properties of sheet molding compounds (SMC). The three types of resin paste mixing techniques, such as batch, batch/continuous, and continuous, for an SMC operation are reviewed. The article discusses the design features and functional operations of the two types of SMC machines, namely, continuous-belt and beltless machines. It explains the formulation and processing of bulk molding compounds and reviews molding methods for bulk molding compounds, including compression, transfer, and injection molding. The effects of the fiber type and length and the matrix type on thermoset bulk molding compounds are discussed. It describes the four injection molding processes of injection molding compounds such as feeding, transporting, injecting, and flowing.
Book Chapter
Bulk Molding Compounds
Available to PurchaseSeries: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003034
EISBN: 978-1-62708-200-6
... Abstract Bulk molding compounds can be molded into a variety of complex shapes by methods that can be readily automated for high volume production. This article describes the formulation and processing (compound formation, and molding methods) of bulk molding compounds. It discusses the effects...
Abstract
Bulk molding compounds can be molded into a variety of complex shapes by methods that can be readily automated for high volume production. This article describes the formulation and processing (compound formation, and molding methods) of bulk molding compounds. It discusses the effects of fiber type, fiber length, and matrix type on thermoset bulk molding compounds. The markets for long-fiber-reinforced bulk molding compounds are electrical, ordnance, aerospace, industrial, sporting goods, and automotive applications.
Book Chapter
Sheet Molding Compounds
Available to PurchaseSeries: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003035
EISBN: 978-1-62708-200-6
... Abstract Sheet molding compounds (SMCs) refers to both material and process for producing glass-fiber-reinforced polyester resin items. This article discusses the material components incorporated into the resin paste for desirable processing and molding characteristics and optimum physical...
Abstract
Sheet molding compounds (SMCs) refers to both material and process for producing glass-fiber-reinforced polyester resin items. This article discusses the material components incorporated into the resin paste for desirable processing and molding characteristics and optimum physical and mechanical properties, including catalyst, fillers, thickeners, pigments, thermoplastic polymers, flame retardants, and ultraviolet absorbers. It talks about the mixing techniques available for SMC resin pastes, including batch, batch/continuous, and continuous mixing. The article also outlines the design features and the operations of continuous-belt and beltless machine type SMCs.
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Published: 01 January 2001
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Published: 01 January 2001
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Schematic of thermoplastic compression molding with molding compound. GMT, ...
Available to PurchasePublished: 01 January 2001
Fig. 7 Schematic of thermoplastic compression molding with molding compound. GMT, glass-mat reinforced thermoplastics
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Composite cross sections. (a) Sheet molding compound made from carbon-black...
Available to PurchasePublished: 01 December 2004
Fig. 1 Composite cross sections. (a) Sheet molding compound made from carbon-black-filled epoxy resin and chopped glass fiber. Bright-field illumination, 65 mm macrophotograph montage. (b) Quasi-isotropic unidirectional prepreg laminate. Slightly uncrossed polarized light, 5× objective
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Published: 01 November 1995
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Published: 01 November 1995
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Published: 01 November 1995
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Published: 01 January 2001
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Published: 01 January 2001
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Cure of sheet molding compound in shear sandwich mode. Cross-linking reacti...
Available to PurchasePublished: 01 January 2001
Fig. 5 Cure of sheet molding compound in shear sandwich mode. Cross-linking reaction indicated by sharp increase in shear modulus. Frequency: 1 Hz; amplitude: 20 μm
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Sheet molding compound and prepreg production versus total reinforced plast...
Available to PurchasePublished: 01 January 2001
Fig. 2 Sheet molding compound and prepreg production versus total reinforced plastics production in the United States
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Tarnished area of interface between the molding compound and the leadframe ...
Available to Purchase
in Corrosion in the Assembly of Semiconductor Integrated Circuits
> Corrosion: Environments and Industries
Published: 01 January 2006
Fig. 6 Tarnished area of interface between the molding compound and the leadframe of a partially drawn thin-small-outline package. The color of the stain is a typical rust color (for Alloy 42 leadframe) or green color (for copper leadframe).
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Book Chapter
Injection Molding
Available to PurchaseSeries: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003014
EISBN: 978-1-62708-200-6
... Abstract Injection molding is a process of forcing or injecting a fluid plastic material into a closed mold. The process generally has the advantages of being more readily automated and of permitting finer part details. Injection-molding compounds are thermoplastic or thermosetting materials...
Abstract
Injection molding is a process of forcing or injecting a fluid plastic material into a closed mold. The process generally has the advantages of being more readily automated and of permitting finer part details. Injection-molding compounds are thermoplastic or thermosetting materials and their composites that are specifically formulated for the injection-molding process. This article discusses the injection molding process, which includes the two basic categories of thermoplastic and thermoset injection molding, and lists the common thermoplastic and thermoset molding compounds and applications. It also describes the operation of the different types of injection molding machines as well as mold design and process controls. The article also describes the selection of injection-moldable thermosets, and provides an overview of part performance, properties, blowing agents, and aesthetic concerns related to thermoplastic structural-foam injection molding.
Book Chapter
Compression Molding and Stamping
Available to PurchaseSeries: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003019
EISBN: 978-1-62708-200-6
... Abstract The compression molding process is most commonly called the sheet molding compound (SMC) process in reference to the precursor sheet molding compound material it uses. This article discusses the types of materials used for sheet manufacture, and describes the manufacturing...
Abstract
The compression molding process is most commonly called the sheet molding compound (SMC) process in reference to the precursor sheet molding compound material it uses. This article discusses the types of materials used for sheet manufacture, and describes the manufacturing 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.
Book Chapter
Compression Molding
Available to PurchaseBook: Composites
Series: ASM Handbook Archive
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...
Abstract
Compression molding is the single largest primary manufacturing process used for automotive composite applications. This article provides an overview of the compression molding process. It describes the basic design, materials, and processing equipment of three main groups of composite 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.
Book Chapter
Fabrics and Preforms
Available to PurchaseBook: Composites
Series: ASM Handbook Archive
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003360
EISBN: 978-1-62708-195-5
... lay-up. It provides a description of the two classes of prepregs. These include those that are suitable for high-performance applications and suitable for lower-performance molding compounds. fabrics advanced composites unidirectional fabrics two-directional fabrics multidirectionally...
Abstract
This article describes the types of fabrics and preforms used in the manufacture of advanced composites and related selection, design, manufacturing, and performance considerations. The types of fabrics and preforms include unidirectional and two-directional fabrics; multidirectionally reinforced fabrics; hybrid fabrics; woven fabric prepregs; unidirectional and multidirectional tape prepregs; and the prepreg tow. The article discusses three major categories of tape manufacturing processes, namely, the hand lay-up, machine-cut patterns that are laid up by hand, and the automatic machine lay-up. It provides a description of the two classes of prepregs. These include those that are suitable for high-performance applications and suitable for lower-performance molding compounds.
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Production volume and relative part performance that can be achieved with v...
Available to PurchasePublished: 01 January 2001
Fig. 1 Production volume and relative part performance that can be achieved with various production techniques. SMC, sheet molding compounds; GMT, glass mat thermoplastics; RTM, resin transfer molding; SRIM, structural reaction injection molding; P/T, pressure/temperature
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