Match die molding

Part Design Blow Molding Casting Compression Extrusion Filament Winding Injection Matched Die Molding Rotational Thermo- forming Transfer Compression Wet lay-up (Contact Molding)... 

Contact Molding. Spray-up Pressure Bag Filament Winding Continuous Pultrusion Premix/ Molding Compound Matched Die Molding with Preform or Mat... 

Master-alloy production, 23 318-319 Masterbatching, 11 307-308 Master contracts, 24 373-374 Master curves, 21 746-747 uses for, 21 747 Master flowmeters, 11 653 Master Oscillator Power Amplifier (MOPA) configuration, 14 697 Masticatory substance, 12 32 Mastic, for protecting art, 11 410, 411 MAT a cells, 26 453 Matched die molding, 20 117 Material balance problems, 10 748 Material balances, in minerals processing, 16 606... 

Compression Molding. Whereas the previous polymer processing techniques are used primarily for thermoplastic polymers, compression molding, also called matched die molding, is used almost exclusively for molding thermoset polymers. In... 

Pari design Casting Compression Filament winding Injection Matched die molding Rotational Transfer compression Wet lay-up (contact molding)... 

Peroxydicarbonic acid, bis(4-(1,1-dimethylethyl)cyclo-hexyl) ester. Bis 4-tert-butylcyclohexyl)peroxydicarbonate EINECS 239-557-1 Perkadox 16 Peroxydicarbonic acid, bis(4-(1,1-dimethylethyl)oyclohexyl) ester. Ultrafast initiator for polyester cure above 180 F pultrusion, matched die molding short ambient temperature compound shelf life. Akzo Chemie. 

Polyesters of this class vary from heavy, sticky gums to brittle but tacky solids. For this reason they are seldom handled in this form but are immediately diluted with the monomer of choice. The resins are available in a wide range of viscosities. Most of the marketed resins yield rigid materials when cured. Flexible resins are available but are used for blending with rigid ones to impart flexibility. The properties of a typical general-purpose resin for matched die-molding work are lisied in Table 15-9. 

The Chevrolet Corvette was one of the first major applications of RPs in the automotive field (USA 1953). The body was made of short E-glass fibers with TS-polyester RP molded largely by the low-pressure hand lay-up and matched die molding (Chapter 5). 

For RPs, electroformed molds are mainly useful for autoclave molding and for closed matched die molding (cold press, low-pressure hot press, resin injection, resin transfer, low-pressure phenolic molding, and resin casting) as well as for reinforced reaction injection molding (RKIM). Prototyping can also use this technique for mold-making. 

Matched-die molding High mold and equipment costs parts often require extensive surface finishing... 

Contact molding, spray-up Pressure bag Filament winding Continuous pultrusion Premix/ molding compound Matched die molding with preform or mat... 

Design factor Bag molding Flexible plunger molding Vacuum injection molding Matched die molding Comp, molding... 

S Matched Die Molding. All of the above techniques are relatively specialized processes for small production runs. For economical mass production of uniform quality products, matched die molding is the standard technique. This is used for manufacture of auto and apphance parts. 

Matched steel dies are chrome plated and operated in heated compression presses. The entire premix is placed in the mold and pressed and heated 1 to 2 min to produce complete cure. Matched die molding is apphed to bulk molding compound, sheet molding compound, prepregs, and performs. 

Sheet Molding Compound (SMC). Liquid resin is spread onto a moving web of polyethylene film. Glass roving is chopped and spread over it. More resin is spread over that, and a second polyethylene film is overlaid on it. The assembly is kneaded to remove air and distribute resin and fibers more uniformly. Then, it is rolled up and stored untb use. For molding, a portion of the leathery sheet is cut, placed in the matched die mold, pressed, and heated about a minute, until cured. 

The preimpregnated fabric is cut to the desired shape and hand laid into or onto the mold. Successive layers can be oriented to optimize properties. Then, the assembly is matched die molded or vacuum bag molded until cured. 

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