Polypropylene

Polypropylene - A tough, light-weight polyolefin plastic made by the polymerization of high-purity propylene gas in the presence of an organometallic catalyst at relatively low pressures and temperatures.

Polymer definition

Polymer - A high-molecular weight organic compound whose structure can be represented by repeated small units.

Polycarbonate Resins processing

Polycarbonate Resins - Polymers derived from the direct reaction between aromatic and aliphatic dihydroxy compounds with phosgene or by the ester exchange reaction with appropriate phosgene- derived precursors.

Polymer plasticize

Plasticize - To soften a material and make it plastic or moldable, either by means of an extruder or by heat or both.

Polymer orientation

Orientation - The alignment of crystalline structure in polymeric materials so as to produce a highly aligned molecular structure.

Olefins

Olefins - A group of unsaturated hydrocarbons and named after the corresponding paraffins by the addition of ene or ylene to the stem. Examples are polyethylene, polypropylene, etc.

Metering section of screw

Metering section of screw - A relatively shallow portion of the screw at the discharge end with a constant depth and lead, usually three to four turns of the flight in length, at which the melt is advanced at a uniform rate to the screw tip.

Melt Flow Index/Rate

Melt Flow Index - The amount, in grams, of a thermoplastic resin which can be forced through a 0.0825 inch orifice when subject to 2,160 grams force for ten minutes at 230°C, per ATSM D1238

Melt decompression

Melt decompression - Reducing pressure of melt during molding cycle, usually by reverse movement of screw.

Polymer melt

Melt - The material in a molten or plasticated condition.

lLDPE - Linear Low Density Polyethylene

lLDPE - Linear Low Density Polyethylene

Linear molecule

Linear molecule - A long chain molecule of two-dimensional structure which may contain side chains or branches.

Plastic filler

Filler - A substance added to the plastic to make it less costly. Some fillers also improve mechanical properties.

Impact strength for polymers

Impact Strength - The ability of a material to withstand shock loading.

EVOH - Ethylene-vinyl alcohol co-polymers

EVOH - Ethylene-vinyl alcohol co-polymers. Used for barrier to gases.

EVA (Ethylene-Vinyl Acetate)

EVA (Ethylene-Vinyl Acetate) - Co-polymers from these two monomers retain many of the properties of ethylene, but have considerably increased flexibility, elongation, and impact resistance.

Polymer Environmental Stress Cracking

Environmental Stress Cracking (ESC) - The susceptibility of a plastic to crack or craze under the influence of certain chemicals, stresses, or other agents.

Polymer elongation

Elongation - Lengthwise stretching of a material usually denoted as a % of original length.

Polymer elasticity

Elasticity - The property of a substance which enables it to return to its original shape and size after removal of a deforming force.

Polymer elastic deformation

Elastic deformation - The part of the deformation of as part under load which is recoverable when the load is removed.