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An anti-plug molding law is a statute, usually a state law, that prohibits the use of an original product, such as a boat hull, as a "plug" for making a mold to use to make copies of the original product. The plug is the core around which the walls of the mold are formed and the contours of which the mold replicates in reverse. [1]
Holes in the bottom of a part are better than holes in side, which require retractable core pins. Depth of blind holes should not be more than 2 times the diameter. Steps should be used to increase the depth of a deep blind hole. For through holes, cutout sections in the part can shorten the length of a small-diameter pin.
Compression molding is a method of molding in which the molding material, generally preheated, is first placed in an open, heated mold cavity. The mold is closed with a top force or plug member, pressure is applied to force the material into contact with all mold areas, while heat and pressure are maintained until the molding material has cured; this process is known as compression molding ...
Before commercial wall plugs, fixings were made to brick or masonry walls by first chiselling a groove into a soft mortar joint, hammering in a crude wooden plug and then attaching to the wooden plug. This was time consuming and required a large hole, thus more patching of the wall afterwards. It also limited the holes' location to the mortar ...
Bed-mould or bed moulding: Narrow moulding used at the junction of a wall and ceiling, found under the cornice, of which it is a part. [2] Similar to crown moulding, a bed mould is used to cover the joint between the ceiling and wall. Bed moulds can be either sprung or plain, or flush to the wall as an extension of a cornice mould. [3]
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Register ring—Aligns injection molding machine screws with the injection mold. Usually made of case-hardened, medium carbon steel material (CHMCS). Sprue bushing — The bush has a taper hole of 3° to 5° and is usually made of CHMCS. The material enters the mold through the sprue bush.