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compression molding

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Published: 15 May 2022
Fig. 45 Schematic drawings of compression molding process. (a) Plastic material is placed in cavity. (b) Heated plastic is compressed. More
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.a0006935
EISBN: 978-1-62708-395-9
... for such processes as resin transfer molding and pultrusion, in which the resin must flow through preplaced glass reinforcements. For other processes, such as extra-high-strength molding compound and prepreg compression molding, the resin must be thickened by reaction to stay on the glass reinforcements. With sheet...
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
... Compression moldings, transfer moldings Aminos (melamine-formaldehyde and urea-formaldehyde) Good general electrical properties, especially arc resistance Compression moldings, extrusions, transfer moldings, laminates, film Diallyl phthalates (DAP) (allylics) Unsurpassed among thermosets in retention...
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
... an additional example of inadequate mold filling. The part shown in Fig. 17 is a composite of multiple metal parts and multiple pieces of rubber. The individual parts are placed in a compression mold to form the final rubber article. The image shown in Fig. 17 was obtained by slicing the part to examine...
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.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.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.a0006916
EISBN: 978-1-62708-395-9
... by underpacking Overpacking is equally detrimental to the quality of molded parts. Overpacking results in highly stressed parts that are susceptible to warpage and mechanical failure and are likely to be attacked by chemicals and solvents. Plastic melt is compressible. When the molten plastic is overpacked...
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
...) Compressive strength, MPa (ksi) Up to 2500 (360) Up to 5000 (725) Up to 350 (50) Young’s modulus, GPa (10 6 psi) 15–400 (2–58) 150–450 (22–65) 0.001–10 (0.00015–1.45) High-temperature creep resistance Poor to medium Excellent … Thermal expansion Medium to high Low to medium Very high...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001491
EISBN: 978-1-62708-217-4
... reduced mechanical properties including tension and compression in the bias direction as compared to nozzles which passed proof tests. Warp direction mechanical properties could not be used to predict pass or fail in a proof test. II. Nozzle Insulation History in Proof Testing The convergent...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001303
EISBN: 978-1-62708-215-0
... Prevented Possible avenues for improvement include use of a premium-strength aluminum alloy, such as C-355 heat treated to the T6 condition. Strength and ductility in the critical bolt circle area would be optimized by the use of chills in the mold to maximize the freezing rate and to minimize the size...
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
... of nucleating agents, or seed particles, which can be small, inorganic particles. Plastics with seeds contain a higher crystalline fraction with small domains. Crystallinity is also affected by the temperature gradient in processing. A high mold temperature reduces temperature gradients and the amount...
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 thermal freedom. In the absence of molded-in stress, the sample would compress due to the loss of load-bearing capabilities as the material undergoes glass transition. Fig. 12 Thermomechanical analysis thermogram showing a high level of residual stress in an amorphous plastic resin...
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
... temperature is reached rapidly at the surface of the mold. As cooling proceeds, the solidification boundary moves inward to the core. Compressive forces are generated at the surface of themold by the solidifying internal layers. Internal layers are in a state of tension. The amount of contraction that takes...
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
... , as illustrated in Fig. 11 . This expansion is associated with rapid expansion as the internal stresses are relieved. This stress relief is due to molecular reorientation on attaining sufficient thermal freedom. In the absence of molded-in stress, the sample would compress due to the loss of load-bearing...
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
... and engineering thermoplastics. All test specimens are prepared by one source. This prevents any variations in mold design and/or molding conditions that would result from each participant molding individualized specimens. An alternative, small-scale repeatability study compares test data generated by two...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001845
EISBN: 978-1-62708-241-9
... for the splint. It was deduced that the maximum von Mises stress (~473 MPa) was developed in regions near the bores and the stress in the interface was approximately 146 MPa. The splint was clamped to the noumenon by the bolts. The axial stress was tensile in the bolt, but compressive in the portion...
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.a0006912
EISBN: 978-1-62708-395-9
... in this article. However, the parameters that significantly affect the impact performance are reviewed in further detail. For example, impact strength is affected by velocity, material thickness, temperature, part geometry, molding conditions, and notch sensitivity. Therefore, plastics are tested based...