The Prop Builder's Molding & Casting Handbook

Book Description

Publication Date: November 15, 1989

The Prop Builder's Molding & Casting Handbook This is the first book to contain, in one comprehensive volume, every molding and casting procedure of use to the theater props builder (no matter what his or her level or proficiency). The author demonstrates the techniques involved in using more than thirty different materials ranging from papier-mache to breakaway glass.
While the use of some materials–plaster and polyester resins, for example–is covered to some extent in other publications, information on the selection and use of rubber materials (latex, neoprene, silicone, and the urethanes) and the procedure for making breakaway windows and bottles is available only in The Prop Builder's Molding & Casting Handbook.
Written in an easy, conversational style, the book will be useful to anyone involved with theater properties, puppetry, and costuming (as professionals or amateurs). It will also serve admirably the needs of students taking classes in those subjects.
Completing the book is a special section on designing and building a vacuum forming machine suitable for use in constructing theater props. More than 450 photographs illustrate the step-by-step procedures explained throughout the entire text.

Editorial Reviews

From Library Journal

The sequel to James's The Theater Props Handbook , this is the second book in the author's crafts trilogy. Properties master of the UCLA theater department, James provides concise, step-by-step instructions on molding and casting procedures using some 30 different materials from papier mache to the new rubber materials. Some 450 illustrations enhance the text. LJ' s reviewer called the previous volume "a marked improvement" over earlier efforts on the topic and an "extremely clear, comprehensive manual" for the professional and novice ( LJ 3/15/88). Be on the lookout for a third book on mask-making in the fall of 1990.
-Francine Fialkoff, "Library Journal"
Copyright 1989 Reed Business Information, Inc.

The Truths Behind Plastic Injection Molding Process

Plastic injection molding involves giving shape to molten plastic into different shapes that are required for our day-to-day life. The mechanism of injection molding for plastic is quite expensive and very complicated. Even the machines involved costs a great deal. Known as injection molding, the machines are solid, and some even weigh a kilo tones.

However, it is only when these machines are used properly, when in the final product turns out to be of high quality. The machines have high temperatures and have the capability to deal with complex systems. Plastic is introduced into the machine and heated until it becomes liquid and then injected for the final products.

The plastic varieties used for the process of plastic injection molding are usually thermoplastics and thermo sets. Some thermoplastics used are nylon, polyethylene, polystyrene and rubber, and Bakelite. Sometimes a highly elastic polymer is also used, which is known as an elastomer.

Plastic injection molding consists of two elements, namely, the injection unit and clamping unit. Do not forget that the processes involved are to be carried out in a systematic manner. Plastic injection molding starts with the first injection of plastics and polymers. The resin is heated to the melting temperature and the liquid is poured into the shape of the desired shape. The forms consist of two components, injection molding and mold removal. The molten plastic resin is poured into the mold with injection molding base. The removal of the mold used to push the plastic after it solidifies in the mold without damaging the screw around.


The next step in plastic injection molding is to use a mechanical or hydraulic pressure. This is to allow air to escape into the mold. This is called building process. Therefore, you can put pressure air cavities in the mold corner moves. Then, the liquid can be cooled and solidified to form. Finally, the plastic solidifies in the mold is removed manually or automatically. CNC Plastic Machining is also used in the plastic machining industry these days for their automated and speedy services.

After cooling, there is often a change in mechanical properties, physical and chemical properties of the plastic machining part. The thickness of the mold is one of the key design considerations for injection molding. In general, a shape with a uniform thickness is preferred. Thus, we can say that plastic injection molding changes the mechanical properties of the plastic part. You can avail the services of a good service provider online that also has tight tolerance machining services to get quality products.
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Plastic Injection Molding: Mold products by absorbing Plasticizing, Injection, Chilling, Ejection

Employing various techniques like thermoplastic and thermoset Injection Molding, blow molding, gyratory molding, compression molding, thermoforming, structural foam molding, etc

We offer comprehensive support from initial concept to final prototyping through production and finishing so that you get the best product and value for your money. Injection molding is widely used for manufacturing a variety of parts, ranging from the smallest accessory to entire body panels for industries like automotive, aerospace and agriculture. Plastic Injection Molding mainly involves following four steps:

    * Plasticizing: During this process we convert the polymer material from its hard granular form to the liquid form at correct melting point. The pellets or plastic powder is melted with in the machine. Powdered or palletized materials used in Plastic Injection Molding machines mainly are, Ethylene, Polycarbonate, Nylon, Polypropylene, Acrylonitrile-Butadiene-Styrene (ABS) and Polystyrene.
    * Injection: It is an important step during overall Plastic Injection Molding process when heated fluid is forced in to the mold at very high pressure. It is fed in to the mold through a nozzle by a long screw plunger inside a heated barrel.
    * Chilling: It involves cooling the melted fluid to allow it go gain rigid shape.
    * Ejection: Here, we remove the cooled and molded object from the mold cavity.


Plastic Injection Molding is widely used to manufacture automotive parts like levers, gears and switches, and medical equipment components like blood analyzer, hear pump parts, orthopedic devices, etc. Plastic Injection Molding is the reason behind a variety of plastic products we use in modern world. Be it your lawn chairs or the PC monitor you have in front of you etc. Plastic Injection is very important process in the manufacturing industry to cast and mold plastic in different shapes and sizes. Almost 32% of all plastics by weight is processed by injection molding. Through Plastic Injection Molding we pass melted plastic in to a mold cavity of inverse shape and allow it to cool resulting in the desired plastic form. We can produce geometrically complex plastic products through Plastic Injection Molding

For more information visit

http://www.patrickplastics.com/injection-molding.htm
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