Mold chase

Charpy impact test See test, impact Charpy. charring See char, chase See mold chase. 

Chase Main portion of the mold, containing the molding cavity, mold pins, guide pins, etc. 

A mold in which a split cavity block is assembled in a chase to permit the forming of undercuts in a molded piece. These parts are ejected from the mold and then separated from the molded piece. 

Chase (shoe) n. An enclosure of any shape used to (1) Shrink-fit parts of a mold cavity in place. (2) Prevent spreading or distortion in bobbing, (3) Enclose an assembly of two or more parts of a split-cavity block and (4) A rectangular metal frame in which type and plates are locked up for letterpress printing. 

Floating chase n. A mold member, free to move vertically, that fits over a lower plug or cavity, and into which an upper plug telescopes. 

Parts A and B are ejected from the mold and then separated from the piece. These sections are made with a taper to fit the chase or honsing. Mold sections and other loose parts are generally called wedges. 

Figure S.7 Cross section of a split cavity mold for producing a molded spool. A and B form the two halves of the cavity. Chase, C, folds the halves together. Other parts are D, core pin E bottom plate and F, the force plug or plunger. (Ref Buckleitner, E.V., ed., Basic Mold Types and Features , Plastics Mold Engineering Handbook, S " ed.. Chapman Hall, New YotIc)...

Split Mold A mold in which the cavity is formed of two or more components held together by an outer chase. The components are known as splits. 

Measurement of a number of properties requires sheet stocks of PFA, from which specimens are punehed out and conditioned before testing. The sheet is prepared by using a chase in the shape of a picture frame with the adequate depth to produce a finished thickness of 1.5 0.25 mm. A fairly thick (0.13-0.18 mm) aluminum foil is sprayed with a high-temperature mold release agent before being placed smoothly over a flat steel plate (>1 mm thick). The chase is then placed over this plate-assembly. An amount of polymer sufficient to produce the sheet is placed in the middle of the chase in the form of a mound. A second sheet of aluminum foil is placed on top of the polymer granules and the top steel plate is added to the assembly, which is then put in a preheated (380 5°C) compression molding press. 

---