MOLDS FOR PLASTICS
There are many different kinds of plastic forming. Borke Mold does the entire mold
finishing in-house. The only thing we farm out is the aluminum casting. We make
tooling for the following industries:
VACUUM FORMING OR THERMOFORMING
There are 2 types of vacuum forming, thin gage and thick gage. The molds can be
male or female and multi-cavity.
Thin Gage Forming (In-line or Roll Fed) with a wall thickness from .005” to .100”.
This is a high production process and the tooling design has to be able to meet
very short cycle times. We have the experience and knowledge necessary to create
a mold.
Thick Gage Forming (Sheet) with a wall thickness from .100” to .500”. Quality mold
construction in the CNC and aluminum casting is important. Stainless Steel tubing
3/8” diameter is molded to the inside wall of the casting for cooling the mold.
PRESSURE FORMING
Pressure form parts have a lot of detail and sometimes textured. The parts look
likes injection molded parts. Mold surface finish and construction are critical.
We hand polish the mold surface then drill small #78 vacuum holes.
CUT-IN-PLACE FORMING
The plastic sheet is formed into shape then cut and the same time instead of later
down the line. A forged die is around the aluminum mold.
TWINSHEET FORMING
It takes a top and a bottom mold with 2 sheets of plastic to make a twinsheet part.
Mold design and construction are important because of the pressure of the molds
against each other. We use blow pins to inject air between the sheets to make a
hollow part.
ROTATIONAL FORMING
Rotational molds are either fabricated or cast aluminum. The 2 halves mount to a
steel spider frame for clamping them together. The mold spins and this makes the
plastic part hollow.
BLOW MOLDING
CNC or aluminum castings are used to form parts. The 2 halves come together as the plastic balloon drops down before the air forces the plastic to expand outward to the mold.
AUTOMOBILE CARPET COMPRESSION FORMING
Carpet with plastic on the back is heated and then pressed to shape with a top and bottom mold. The 2 molds compress together and force the carpet into a shape. The plastic will keep the carpet to the formed shape. Carpet tooling is thick and heavy due to the amount of pressure to squeeze the carpet. The tooling can be CNC, aluminum castings or fiberglass
