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Topic: Molding (process)

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	Blow Molding - Process
		During this process the resin raw material is melted in the machine barrel, forced over a spreader and through the die head into the mold.
		The workpiece for the second, blow molding, process is the preform-mandrel assembly.
		Mold inserts are separate components fitted to the mold to produce specific features, e.g., a thread insert used to produce threads on the neck of a container.
	www.me.umn.edu /education/courses/me3221-sum/Lab/BlowMolding/blowmolding.html (2086 words)

	Chapter 5 : Manufacturing Process
		In the compression molding process, illustrated in Figure 7-6, a thermoset plastics, phenolic, melamine, or polyester, is molded in an enclosed mold between two heated platens.
		Molds for casting are made of materials resistant to the chemical attack of the resins.
		The mold is heated to the curing temperature of the resin varying from 325 degrees to 400 degrees F. The process produces parts with uniform thickness and fully cured resin.
	online.sfsu.edu /~jge/html/body_low_production_processes.html (2430 words)

	ROTATIONAL MOLDING
		MO Rotational molding is a unique process of molding that was first applied in 1946 due to the availability of liquid plastics.
		Rotational molding applications are formed using a combination of important components such as a mold, resinous material, heat, spinning axes, cooling chamber and load and unloading chambers.
		The machine, is one with arms that hold a mold in place and rotate it slowly until a material (resin) inside the mold is properly shaped and conformed to the mold.
	www.bsu.edu /web/wwisner/rotational_molding1.htm (1194 words)

	Plastics Injection Molding, Plastics Industry, Plastics Molding
		Identical parts are produced through a cyclic process involving the melting of a pellet or powder resin followed by the injection of the polymer melt into the hollow mold cavity under high pressure.
		The polymer flows from the nozzle to the mold which is coupled to the nozzle by a sprue bushing.
		In a mold with multiple cavities, the melt flows to each cavity by runners and is fed to the cavity through a gate.
	www.jobwerx.com /resources/injection_molding.html (825 words)

	Resin Transfer Molding - RTM Composites - JHM Technologies
		The open mold process is performed in molds made from basically the same resins and fiberglass reinforcements as are the parts produced in the molds.
		Additionally, the open mold process by having only a single mold half, the back side of the molding is fully dependant on the skill of the operator to maintain the part thickness and finish smoothness.
		The actual MIT molding process is injected exactly as the RTM process had been carried out for the last 30+ years, it is only now that we have the ability to address the major cost factor, tooling surface finish life.
	www.rtmlight.com /demystify.htm (2625 words)

	Medical Molding: Saint-Gobain Performance Plastics, Medical Business Unit
		The type of molding process selected to produce a particular part is influenced by many things: the complexity and specifications for the part, material requirements, allowable part tolerances, the number of parts to be molded and the economic restrictions of the project.
		A pumping systems mixes the 2 components, typically an "A" and a "B" component with the consistency of toothpaste, in a precision meter-mix process to a given ratio and delivers the mix to the tool in the injection machine to be vulcanized or cured into it's final state.
		Higher cavitation molds can be used with any of these methods; however, since cycle times are higher than the LIM process and more labor is involved, parts are not necessarily less expensive.
	www.medical.saint-gobain.com /capabilities/molding.asp (647 words)

	THE ROTATIONAL MOLDING PROCESS
		Rotational molding technology is expanding the capabilities of polymer product manufacturers by enabling them to create light-weight, seamless, stress-free parts of virtually any size in the most complex shapes.
		In the final load/unload stage, the part is removed from the mold and a new charge of material is loaded into the mold.
		No, rotational molding is a low/no pressure process where the molds are charged with resin, clamped shut and rotate in two axes at low speeds.
	www.ferryindustries.com /rot_mold.html (618 words)

	Structural Foam Molding - Lomont Molding, Inc. (Site not responding. Last check: 2007-10-26)
		- Structural foam molding is a modification of the injection molding process.
		A thin layer of plastic solidifies along the mold wall.
		The thin outer (solid) wall is supported by the interior cellular foam structure.
	www.lomont.com /Structural.htm (134 words)

	Hunter Douglas Custom Components: Injection Molding
		While the mold is slowly turning a tumbling, it is heated in an oven by forced hot air, and as the mold wall heats, the resin begins to stick to the inside of the mold, forming a hollow part.
		Plastic injection molding is a repetitive process in which plastic is melted or plasticated and injected into a mold containing a cavity in the shape of the desired article.
		The mold base is an assembly of precision steel plates that holds or retains the cavities or cores in a mold.
	www.hdcustomcomponents.com /molding101.php (2147 words)

	Blow Molding-jobwerx
		In this process a plastic tubular form, produced by extrusion or injection molding, is used to form the part.
		In the injection blow molding process, the material is injection molded.
		In the one-stage process, preforms are injection molded, conditioned to the proper temperature, and blown into containers—all in one continuous process.
	www.jobwerx.com /plastics/blow_molding.htm (509 words)

	Noble Plastics Injection Molding FAQ
		Injection molding is the process of melting plastic resin, injection of the melted resin into a closed mold, the freezing or setting of the molten plastic, the opening of the mold, and finally the ejection of the molded part.
		Sometimes referred to as over-molding, this process is identical to the Injection Molding process with the exception that one or more "inserts" are loaded into the mold prior to the injection phase.
		A "Mold Flow" analysis is an injection molding process simulation that, at a minimum, includes the filling of the part cavity with a specific plastic material.
	www.nobleplastics.com /faq.htm (671 words)

	Foam Fabricators - molding process
		Unlike other thermoplastic processes, the production of molded foam products requires that the raw materials be pre-expanded prior to the final molding process.
		This process involves the heating of beads, using a flow of steam, which causes the blowing agent to boil and thus a honeycomb of closed cells is formed.
		The mold tool is fitted into a press, which has the facility to introduce steam from behind each half of the tool.
	www.foamfabricatorsinc.com /Page.aspx?nid=85 (327 words)

	Injection Molding Process
		Injection molding has been one of the most important fabrication tools for the plastics industry since the reciprocating screw machine was patented in 1956.
		The injection molding process involves melting the plastic in an extruder and using the extruder screw to inject the plastic into a mold, where it is cooled.
		The most consistent processing results from careful control of plastic temperature, plastic pressure as it fills the mold, the rate at which the plastic fills the mold, and the cooling conditions.
	plastics.dow.com /plastics/na/fab/molding/improcess.htm (442 words)

	Plastics Dome / Blow Molding (Site not responding. Last check: 2007-10-26)
		Process of inflating a hot, hollow, thermoplastic preform or parison inside a closed mold so its shape conforms to that of the mold cavity.
		In extrusion blow molding the parison is formed by forcing molten plastic through an annular orifice in a die that is part of the die head assembly.
		The workpiece for the second, blow molding, process is the preform-mandrel assembly.
	plastics.turkavkaz.ru /processes/molding/blow-molding (292 words)

	Custom Injection Molding \| Rubber Injection Molding \| Plastic Injection Molding
		Compression rubber molding is a process of molding parts where a cavity (part configuration) is cut into a metal top plate, bottom plate and a center plate (if needed).
		Transfer rubber molding is a process of molding rubber parts where a cavity (part configuration) is cut into a metal top plate, bottom plate and a center plate (if needed).
		Injection / liquid injection molding is a process of molding rubber parts where a cavity (part configuration) is cut into a series of metal plates that are stacked to form the mold.
	www.atperpg.com /rubber-molding.html (1150 words)

	Blow molding of bottles, containers, automotive products.
		Processes available include inject+blow and extrude+blow for a wide variety of sizes.
		Industrial moldings can also be supplied for automotive or other applications.
		Blow molding enquiries are welcome for producing from existing molds but new projects can also be undertaken, including tool development, making use of proven technical skills and experience in all aspects of the tooling and molding process.
	www.blow-molding.co.uk (327 words)

	Vesta Inc. \| Manufacturing \| Molding
		Molding and vulcanization (curing) occur inside the mold cavities within 10 to 90 seconds due to the high mold temperature.
		During transfer molding, a hydraulic ram displaces the pre-mixed rubber through gates and sprues into the mold cavities.
		Insert molding uses an injection process to overmold a silicone or non-silicone part placed inside the mold cavity.
	www.vestaweb.com /manufacturing/molding.htm (207 words)

	Plastic Bottle Corporation; plastic bottles, plastic jugs, plastic jars
		Extrusion blow molding is perhaps the simplest type of blow molding, whereby a hot tube of plastic material is dropped from an extruder and captured in a water cooled mold.
		In one process, the machinery involved injection molds a preform, which is then transferred within the machine to another station where it is blown and then ejected from the machine.
		Whether using the injection stretch blow molding process or the reheat and blow process, an important part of the process is the mechanical stretching of the preform during the molding process.
	www.plasticbottle.com /techinfo/article.html (1175 words)

	Rotational Molding
		Rotational molding is a manufacturing process used to produce hollow plastic parts in one piece.
		Next the mold is moved, or indexed, to the heating chamber where it rotates on its horizontal and vertical axes.
		In the first phase of the process the mold, either cast aluminum or fabricated sheet metal, is charged with a rotationally moldable material.
	www.formedplastics.com /acb/stores/1/LearnMoreRotationalMolding.aspx (601 words)

	Pine Wood Derby Cars -Building Process
		This makes the OD of the wheel concentric to the wheel bore and removes the mold mark on the wheel for a perfectly flat and concentric wheel.
		Wheels are matched by mold number for a perfectly matched and balanced set of wheels.
		- We use a square the hubs to the centerline of the wheel, to correct diameter irregularities and defect from the injection molding process of molding the wheel and to eliminate Mold Cavity to Cavity variation.
	pinewood-derby-cars.net /process.htm (425 words)

	Injection Molding Magazine
		Decoupled Molding allows process capability to be achieved beyond that of traditional molding techniques and allows the molder to use the full potential of the new machine’s sophistication.
		To understand the differences in molding techniques, it is important to define what we mean by a traditional molding process, and to then differentiate it from Decoupled Molding.
		Injection molding evolved from a manual process in the 1940s, when machines were virtually unsophisticated arbor presses in which plastic was squeezed into a mold that was manually clamped by hand.
	www.immnet.com /articles?article=2635 (1613 words)

	The Flexan Corporation
		When compression molding, the uncured rubber is loaded into the mold and the mold is put into the press.
		These processes give you the most flexibility as far as choice of molding compounds, part size and tooling costs, although cycle times are longer and labor costs run higher.
		In the transfer molding process the material is introduced to the cavities by being transferred through a gate.
	www.flexan.com /moldingProcess.html (266 words)

	Molded Plastic
		The RTM light process is one which the bottom mold is normally a ridge cavity.
		RTM light uses a perimeter resin feed channel which fully circumvents the mold cavity feeding the resin from the mold perimeter towards the exit vent in the mold center in a converging flow path.
		A high gloss surface appearance may be achieved on the 'A' side by applying gelcoat to the mold prior to the application and lamination of the reinforcements.
	www.moldedplastic.com /molding.html (502 words)

	Technical Article: The Blow Molding Process from Plastic Bottle Corporation; Producers and Sellers of plastic bottles, ...
		Extrusion blow molding is perhaps the simplest type of blow molding, whereby a hot tube of plastic material is dropped from an extruder and captured in a water cooled mold.
		In one process, the machinery involved injection molds a preform, which is then transferred within the machine to another station where it is blown and then ejected from the machine.
		Whether using the injection stretch blow molding process or the reheat and blow process, an important part of the process is the mechanical stretching of the preform during the molding process.
	www.imageproductions.com /WhatWeDo/websites/PB/techinfo/article.html (1168 words)

	Hydraulic Presses, Oilseed Cracking and Flaking Mills, Polymer Drying and Dewatering Machinery (Site not responding. Last check: 2007-10-26)
		The mold is overfilled with raw material so that when the mold plates are fit together and placed under pressure, the excess material helps to carry out the air.
		After the glass-filled preform is loaded into the open mold, the mold is closed and the polyurethane resin is injected where it permeates and surrounds the preform to form the part.
		It is ideal for insert molding because the tool is closed prior to the material being transfer, which limits the amount of shift with the insert parts.
	www.frenchoil.com /moldingprocesses.shtml (1438 words)

	Rotational Molding (Site not responding. Last check: 2007-10-26)
		Rotational molding is a process whereby a hollow mold is filled with a powder resin and then rotated bi-axially in an oven until the resin coats the inside of the mold and cures.
		Cast aluminum molds are one of the predominant molds used in the Rotational molding process.
		Multiple piece molds should be designed whenever possible to use slide system or hinge system to guide opening and closing of multiple piece molds, this results in less damage to part line and ease of operator performance.
	www.boyce.com /rotationalmolding.htm (2231 words)

	Injection Molding with Liquid Silicone Rubbers: Using Process Design to Maximize Results (MPB archive, Nov 97)
		The objective of the meter/mix/dispense phase of the molding process is to introduce equally proportioned and mixed LSR to the injection molding machine.
		Filling the mold to compaction, evaluating where voids are located, and then adding a vent is a normal corrective practice, with the size of the vent critical to maintaining cavity pressure and minimizing flash.
		The typical vent depth for processing LSRs is 0.0003 to 0.0005 in., with appropriate land length of approximately 1Ž8 in.
	www.devicelink.com /mpb/archive/97/11/002.html (2506 words)

	Blow Molding Reference Guide
		The mold opens, and the cooled part is ejected, and is ready for trimming.
		Aluminum molds are used, and these parts are made with a relatively low mold cost and relatively high labor (trimming) costs.
		While hot, it is moved to the blow mold, where it is inflated against the cavity walls.
	www.oxfordsource.com /Home/Design/Blow_Molding/blow_molding.html (399 words)

	RTV molding and urethane casting
		Often called urethane casting, the RTV molding process has been used to create models that put the "function" in the RP industry's phrase "fit, form and function." People have been using RTV molding (room temperature vulcanization or silicone rubber molding) for years to fill the void between prototype and production.
		Silicone molds are capable of reproducing remarkable detail, and because of the flexibility of silicone, draft angles, inserts, and undercuts are not as critical as in other molding processes.
		These molds can produce up to 20 parts per mold, and they can be made as family or multi-cavity molds.
	www.vistatek.com /capabilities_molding.html (518 words)

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