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injection-compression molding

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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...
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
... molding, compression molding, transfer molding, hand lay-up process, casting, and additive manufacturing. compounding operations dies extruder extrusion molding injection molding mixing molds process troubleshooting product design screw extruder thermoforming webline handling Extrusion...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006916
EISBN: 978-1-62708-395-9
... Abstract This article focuses on manufacturing-related failures of injection-molded plastic parts, although the concepts apply to all plastic manufacturing processes It provides detailed examples of failures due to improper material handling, drying, mixing of additives, and molecular packing...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006913
EISBN: 978-1-62708-395-9
... of properties in high-humidity environments; have among the highest volume and surface resistivity in thermosets; low dissipation factor Compression moldings, extrusions, injection moldings, transfer moldings, laminates Epoxies Good electrical properties, useful over a wide range of environments Castings...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.9781627083959
EISBN: 978-1-62708-395-9
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006932
EISBN: 978-1-62708-395-9
..., with the compressive stresses on the surface and the core in tension. A team of researchers characterized residual stresses in injection-molded parts in which flow-induced stresses and orientation accompany thermal stresses ( Ref 23 , 32 , 33 ). Flow-induced tensile stresses maximize at the mold surface. When...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006927
EISBN: 978-1-62708-395-9
... with permission by Elsevier. Copyright Elsevier 2017 Depending on the application to be developed, the design engineer should visualize the part or assembly from one or more perspectives. For example, if an extremely high-volume part will require multi-cavity injection molds, the design engineer should...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006922
EISBN: 978-1-62708-395-9
... to the chemical reaction Fewer joining options Thermosets come in a wide range of colors/finishes, can be injection and compression molded, can be recycled, and generally have attractive pricing. This article focuses primarily on thermoset materials that at room temperature are below their glass...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006912
EISBN: 978-1-62708-395-9
... representations of a molded part if the material in the machined part is similar to that in the injection-molded part, the machined sample is annealed, and the geometry of the machined part closely matches that of the injection-molded part. The following differences between a machined plastic part and a molded...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003525
EISBN: 978-1-62708-180-1
... are prone to environmental stress cracking. Molded-in stresses are commonly imparted through the forming process, especially injection molding and thermoforming. Molded-in stress is observed in amorphous resins as a marked expansion in the sample dimension at temperatures approaching the T g...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006915
EISBN: 978-1-62708-395-9
... with various regions of the viscosity curve. It discusses the concept of shear sensitivity, the nature of viscoelastic properties, and the electrical, chemical, and optical properties of different plastics. It also reviews plastic processing operations, including extrusion, injection molding, and thermoforming...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006925
EISBN: 978-1-62708-395-9
... be reduced to a single curve when weight-average molecular weight is used. Plastics with narrow molecular weights are preferred for low warpage in thin-wall injection molding, film extrusion, and rotational molding. Plastics with moderately low molecular weights are suitable for high-speed processing...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006933
EISBN: 978-1-62708-395-9
... sufficient to result in the failure of plastic materials. Such stresses are particularly important in amorphous resins, which are prone to environmental stress cracking. Molded-in stresses are commonly imparted through the forming process, especially injection molding and thermoforming. Molded-in stress...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006928
EISBN: 978-1-62708-395-9
... thermoplastics D3419 10724 In-line screw-injection molding of test specimens from thermosetting compounds D3641 294-1,2,3 Injection molding test specimens of thermoplastic molding and extrusion materials D4703 293 Compression molding thermoplastic materials into test specimens, plaques, or sheets...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006923
EISBN: 978-1-62708-395-9
... properties. For these materials, properties such as tensile strength and modulus can be correlated with density, which in turn is related to crystallinity. One primary example is PE, which in the commercial market is classified according to density. Hydraulic stress during injection molding flow...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003508
EISBN: 978-1-62708-180-1
... iron, gray cast iron, malleable irons, ductile iron, low-alloy steel castings, austenitic steels, corrosion-resistant castings, and cast aluminum alloys are the materials discussed. The article describes the general types of discontinuities or imperfections for traditional casting with sand molds...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006942
EISBN: 978-1-62708-395-9
... in the extrusion direction than in the lateral direction. Similarly, glass fibers tend to align in the flow direction during injection molding, leading to increased properties in the flow direction. Blow molding and insert molding can create interferences between different components, which can serve to create...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006849
EISBN: 978-1-62708-395-9
... Chloride Polymers ,” D 1243-15, Plastics (I), Vol 8.01 , Annual Book of ASTM Standards , ASTM International 11. “ Specification for Nylon Injection Molding and Extrusion of Materials ,” D789-18, Plastics (I), Vol 8.01 , Annual Book of ASTM Standards , ASTM International 12. “ Recommended...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006940
EISBN: 978-1-62708-395-9
.... The cyclic stress-strain response is the response of polymers that describes their behavior once cyclic plasticity has modified the metastable behavior under fatigue deformation. Cyclic stress-strain curves for high-density polyethylene (compression molded), impact polypropylene copolymer, short-glass-fiber...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006917
EISBN: 978-1-62708-395-9
... to reduce the crystallinity has enhanced the ESC resistance ( Ref 14 ), but others show better ESC resistance with higher levels of crystallinity, as achieved through slow cooling during injection molding ( Ref 15 ). It appears likely that the phenomenon is coupled in these studies. The presence...