Copy of `Blueridge Films - Plastic terms`

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Blueridge Films - Plastic terms Category: Agriculture and Industry > Plastics terms Date & country: 02/08/2019, US Words: 117

Talc
A natural hydrous magnesium silicate, used frequently as a filler such as steatite, talcum, mineral graphite.

Tackifier
A substance such as a resin ester which is added to synthetic resins or elastomeric adhesives to improve the initial and extended tackiness of the film.

Tack
The stickiness of an adhesive, measurable as the force required to separate an adherent from it by viscous or plastic flow of the adhesive.

Tensile Strength
The maximum tensile stress sustained by the specimen before failure in a tension test. Usually expressed in pounds per square inch or megapascals. The cross-sectional area used is that of the original specimen, not at the point of rupture.

Tear Resistance
Resistance of a material to a force acting to initiate and then propagate a failure at the edge of a test specimen.

Thermosets
Resins or plastic compounds which in their final state as finished articles are substantially infusible and insoluble.

Thermoplastics
Resins or plastic compounds which, in their final state as finished articles, are capable of being repeatedly softened by an increase of temperature and hardened by a decrease of temperature.

Thermoforming
The process of forming a thermoplastic sheet into a three-dimensional shape by clamping the sheet in a frame, heating it to render it soft, then applying differential pressure to make the sheet conform to the shape of a mold or die positioned below the frame.

Titanium Dioxide
A white powder available in two crystalline forms, the anatase and rutile types.

Transition Temperature
The temperature at which a polymer changes from (or to) a viscous or rubbery condition to (or from) a hard and relatively brittle one.

Treater
Equipment and process used to render a surface of inert plastics, such as polyethylene, more receptive to inks, adhesives, or coatings.

Vapor Barrier
A layer of material through which water vapor will not pass.

Vicat Softening Point
The temperature at which a flat-ended needle of 1 square millimeter circular or square cross section will penetrate a thermoplastic specimen to a depth of 1 mm under a specified load using a uniform rate of temperature rise. (ASTM D-1525-58T).

Virgin Material
Any plastic compound or resin that has not been subjected to use or processing other than that required for its original manufacture.

Viscosity
The measure of the resistance of a fluid to flow (either through a specific orifice or in a rotational viscometer).

Wrinkle
A surface imperfection in plastic films that has the appearance of a crease or wrinkle.

Yellowness Index
A measure of the tendency of plastics to turn yellow upon long-term exposure to light or heat.