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blow molding

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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
... Abstract Blow molding has emerged as a commercially viable process for manufacturing parts for nonpackaging/industrial markets. This article discusses the machinery required, processing methods, mold types, process parameters, part designs and material distribution of blow molding. It provides...
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
... 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...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003017
EISBN: 978-1-62708-200-6
... items are quite low, compared with most other plastics processes. However, production rates per individual machine may be lower than with other processes, such as injection molding and blow molding. Because rotational molding can produce uniform wall thickness on hollow parts up to 83,300 L (22,000 gal...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005252
EISBN: 978-1-62708-187-0
... makes them unsuitable for mold blowing; they can be used only for dump-box production of molds. The resin-coating method has largely superseded dry resin-sand mixing. Coated sand is produced in a mulling machine, by mixing together the sand, a suitable resin, a catalyst (hexa), lubricants, and...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005256
EISBN: 978-1-62708-187-0
... and hydraulically clamp molding box halves Blow in preexpanded Styrofoam beads Close off Styrofoam fill guns, then inject steam to expand and bond the beads Stop the steam and run water through cooling lines Open the mold box Eject pattern from cavity The finished EPS pattern has a...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005243
EISBN: 978-1-62708-187-0
... finishing work or core setting. The mold is then closed and removed from the molding chambers. Fig. 10 Gravity-fill pressure squeeze molding machine using match plate patterns Other match plate machines fill cope and drag molding chambers simultaneously by blowing the sand into the cavity ( Fig...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005354
EISBN: 978-1-62708-187-0
... depends to a large extent on close scheduling of the mixing and molding or coremaking. If the mixture is allowed to stand after mulling, partial hardening takes place, which causes trouble in the subsequent blowing or ramming operations. If it is necessary for the mulled mixture to be held for any length...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003172
EISBN: 978-1-62708-199-3
... Abstract This article discusses classification of foundry processes based on the molding medium, such as sand molds, ceramic molds, and metallic molds. Sand molds can be briefly classified into two types: bonded sand molds, and unbonded sand molds. Bonded sand molds include green sand molds...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003012
EISBN: 978-1-62708-200-6
...--blowing agents, mold-release agents, lubricants, plasticizers, and heat stabilizers--and for improving properties antimicrobials, antioxidants, antistatic agents, colorants, fillers and fiber reinforcements, flame retardants, impact modifiers, light stabilizers, plasticizers, and heat stabilizers...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005277
EISBN: 978-1-62708-187-0
... and thus opens up the double-oxide bubble trails. No bubbles from the outgassing of cores should pass through the liquid metal in the mold cavity. Cores must be of sufficiently low gas content and/or adequately vented to prevent bubbles from core blows. No use of clay-based core or...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005299
EISBN: 978-1-62708-187-0
... controlled to enable the proper refining actions to occur. Carbon is added in excess of the specification limits on many alloys to permit an oxygen blow. Oxidizable elements such as silicon, manganese, and chromium may need to be restricted. Tramp elements such as sulfur, phosphorus, lead, tin, zinc, arsenic...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005242
EISBN: 978-1-62708-187-0
... Abstract This article reviews the basic types of mold aggregates and bonding methods for expendable molds and coremaking. It provides an overview of mold media and the basic types of sands and their properties. The most significant clays used in green sand operations, such as bentonites, are...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009015
EISBN: 978-1-62708-187-0
... volumes of parts, the foam pattern is produced from tooling installed on a foam blowing machine of some type. The lost foam foundries have discovered numerous EPS additives and foam molding techniques to produce the best foam pattern that results in the best casting with the least number of defects...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005244
EISBN: 978-1-62708-187-0
... gas input manifold and a lower gas exhaust manifold. The catalyst gas enters the core box through the blow ports or vents and passes through the core, causing almost instantaneous hardening of the resin-coated sand. The core is ready for ejection from the core box after purging with clean air for a...
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
... up. (c) Mold moves to top of chamber. Released pressure allows sheet to drape over mold. Source: Ref 1 In trapped-sheet, contact heat, pressure thermoforming ( Fig. 8 ), a hot, porous blow plate is used in both the heating and forming process. The plastic sheet lies between the female mold...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005308
EISBN: 978-1-62708-187-0
... example of an intricate full split aluminum core box used in a core blowing machine is shown in Fig. 4 . Because many coremaking processes require the use of a gas catalyst to cure the core and binder, special venting considerations must be included in the core box design. Ejection pins can also be...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005253
EISBN: 978-1-62708-187-0
... expendable foam patterns is typically not the best way to produce a good lost foam casting, but it is acceptable for prototypes or one-of-a-kind applications. More typically, especially for high-volume parts, the foam pattern is produced from tooling installed on a foam-blowing machine ( Fig. 6 ). The lost...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005307
EISBN: 978-1-62708-187-0
... should require a minimum of time. The spray system should be selected to allow for ease in movement when installing dies and/or making machine repairs. Each system has advantages and limitations. Most use air for spraying and blow-off. Some systems use air for movement, while others use hydraulic power...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003021
EISBN: 978-1-62708-200-6
... screws or bolts, nuts and washers, molded-in threads, self-threading screws, rivets, spring-steel fasteners, press fits, and snap fits. The article explains solvent bonding used for thermoplastic parts, and tabulates the solvent types used with various plastics. It also describes the surface preparation...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005420
EISBN: 978-1-62708-196-2
.... When combined with improper venting, this can lead to the creation of a defect found at the top of foundry castings, known as a surface blow hole. Shrinkage and porosity defects are related to the final shape of the casting. When the solid metal shell is strong enough to resist shrinkage and retain...