All
| Term | Definition |
|---|---|
| Bayblend® |
Bayblend sheets are a blend of PC and ABS with high rigidity. They are very suitable for thermoforming and are easy to machine. They can also be assembled with other materials, either mechanically or by bonding. The sheets can be painted or printed on using standard processes. Bayblend is available in various colours and textures. Bayblend is a registered trademark of Bayer Corp. |
| Beta Gauge |
A thickness measuring device used for sheeting or extruded pans. The device operates by beta radiation being emitted on one side of the pan and a detector placed on the opposite side. When a pan is passed through the beam, some of the beta radiation is absorbed, which is indicative of the pan thickness. |
| Biaxial Orientation |
The process of stretching a hot plastic film or other article in tow directions under conditions resulting in molecular orientation in two directions. |
| Biodegradation |
The degradation of plastics by microorganisms when buried in the soil. Some plastics can be modified to become biodegradable by the incorporation of a biodegradable additive such as corn starch. |
| Blanking Die |
The cutting of a flat sheet to shape by striking it sharply with a metal punch while supporting it on a mating die. |
| Blend |
The mixing of polymers with other polymers or copolymers, usually where the mixture results in the desired physical properties. |
| Blister |
A defect on an injection molded part caused by trapped gases within the pan. |
| Bloom |
A thin, greasy film on the surface of a plastic film or pan usually caused the exudation of an additive. Slip additives are designed to migrate or bloom to the surface of films. |
| Blow Film Tower |
Apparatus for handling film in blown film extrusion between the extruder die and take-up equipment. The blown film tube passes through the tower where it is cooled, sized and gauged. Nip rolls are located at the top where the inflated tube is collapsed prior to winding. |
| Blowing Agent |
A substance which, alone or in conjunction with other substances, is capable of producing a cellular structure in a plastic mass. |
| Capillary Rheometer |
An instrument for measuring the shear flow properties of polymer melts. The data obtained is usually presented as graphs of shear stress against shear rate at a constant temperature. |
| Cellulose Acetate |
An acetic acid ester of cellulose which forms a tough, transparent thermo-plastic material when compounded with plasticizers. |
| Chill Roll |
A cored roll, usually temperature controlled with circulating water, which cools a molten polymer web on contact before winding. |
| Chromatography |
The process used for analysis and separation of mixtures of two or more substances, and for determining many characteristics in research work. |
| Chrome Pigments |
Pigments based on basic lead chromate. Included are chrome yellow and orange. They have intense colors, good acid resistance, and heat stability. |
| Clamp Tonnage |
Rated clamping capacity of an injection or transfer molding machine. |
| Clamping Area |
Largest molding area an injected molding machine can hold closed under full pressure. |
| Clamping Pressure |
Pressure which is applied to an injection or transfer mold to hold it closed. |
| Coating |
Coating of a substrate by extruding a thin film of molten polymer and pressing it onto the substrate. |
| Coating Weight |
Weight of coating per unit area. |
| Coefficent Of Friction |
Resistance to movement of sliding or rolling surfaces of solid bodies in contact with each other. |
| Coefficient Of Thermal Expansion |
Change in dimension of a material per unit change in temperature. |
| Coextrusion |
The technique of extruding two or more materials through a single die being fed by separate extruders. |
| Coinjection |
The technique of injecting two materials into a single mold from two plasticating cylinders, either simultaneously or in sequence. |
| Color Concentrate |
A plastics compound which contains a high percentage of pigment to be blended into base resins. The term masterbatch is sometimes used for color concentrate as well as for concentration of other additives. |
| Colorant |
Dyes or pigments which impart color to plastics. The dyes are synthetic or natural compounds of submicroscopic size, soluble in common solutions, yielding transparent colors. Pigments are organic and inorganic substances with larger particle sizes and are usually insoluble in common solvents. |
| Colorimeter |
An instrument for measuring and matching colors. |
| Comonomer |
A monomer which copolymerizes with another monomer. |
| Compressive Strength |
Load at which compressive failure occurs in a specimen divided by the original cross sectional area of the specimen. |
| Continuous Polymerization |
A type of polymerization in which the monomer is continuously fed to a reactor and the polymer is continuously removed. |
| Controltac™ |
3M Controltac Wrap Film is an opaque, white cast vinyl adhesive film. Controltac is pressure-activated, slideable, repositionable, and has excellent resistance to water. It is a long-term durable and removable cast film with conformability and lifting resistance, good for use in vehicle wraps. Controltac is a trademark of 3M Corporation. |
| Convertor |
A term used in the packaging industry. Convertors buy plastic film or sheeting in the form of roll stock and convert it to useful forms by slitting, die cutting, heat sealing, etc. for resale to packaging firms. |
| Cooling Channels |
Passageways provided in molds or platens for circulating water or other cooling media, in order to control the surface temperature of the cavities and remove heat from the polymer. Operating cycles in injection and blow molding are made shorter by means of such cooling. |
| Copolymer |
A polymer resulting from the polymerization reaction of two chemically different monomers. |
| Core |
Male part of mold which shapes the inside of molded part. |