11-12-2012, 02:44 PM
Compression and Transfer Molding
Compression and Transfer.ppt (Size: 4.24 MB / Downloads: 72)
Compression Molding
Charge is placed in cavity of matched mold in the open position
Mold is closed by bring the two halves together
Pressure is exerted to squeeze the resin so that it fills the mold cavity
While under pressure the mold is heated which cures the resin
Thermosets
Standard thermosets of various types
Molding compounds (mixtures of materials)
Thermoset resin (30%)
Reinforcement fibers (10%)
Fillers (60%)
Bulk Molding Compound (BMC)
Sheet Molding Compound (SMC)
Sheet Molding Compound Compression Molding
Charge is made up from thermoset materials
Charge is rolled flat
Multiple layers of SMC can be used in a mold
Longer fibers than BMC
Transfer Molding
Mixed resin is placed in the transfer chamber
Resin is heated to liquid state
Plunger presses liquid resin through sprue and runner system to mold cavities
Mold is heated
After resin is cured, parts are removed