Acrylic resins are used extensively in adhesive formulations, particularly pressure- sensitive variations. Their cost prevents wide use in the packaging industry as molded parts or films. Acrylic plastics have crystal clarity, good surface hardness, good mechanical and chemical stability, and exceptional weather- ability. Economics limits its use in other fields.Ī general chemical term for thermoplastic materials made by polymerization of monomeric esters of acrylic acids. The polymer has outstanding moisture and excellent oxygen barrier properties, as well as being clear, rigid, and relatively easy to thermoform. Trade name for a polychlorotrifluoroethylene (PCTFE) polymer. The fastest drying solvent in the ketone family. (b) In graphic arts the term “acetate” is occasionally used to describe film or sheet keyline overlays even though poly(ethylene terephthalate) (Mylar) has replaced cellulose acetate materials in most current applications.Ī very active solvent used mainly in gravure inks. Acetate is often used as a generic description of any one of a family of plastic materials (for example cellulose acetate) or to one of a family of solvents, (for example, n propyl acetate). a) In its chemical sense, acetate describes any chemical structure having an acetate functional group in its molecule.Translucent to opaque resins produced by polymerization of formaldehyde and characterized by a high melting point, high strength and stiffness, and solvent resistance. The two definitions are not interchangeable. The definition of buffer is to shield or cushion an upstream machine from a downstream machine that stops (via conveyor length or off-loading areas such as tables or conveyors where the inputs can gather). Accumulators should not be confused with buffers. In automated packaging operations, a device, table, or type of conveyor designed to permit the gathering of materials, packages or objects. Other systems are available for gases such as ethylene oxide, which is related to the ripening of certain fruits. The majority of these are based on silica gels. Moisture or water vapor absorbers or desiccants are used to remove or control the moisture or humidity level in a package. The absorbent chemical can be placed in a separate packet or sachet, or may be incorporated into some part of the packaging material itself. Oxygen scavengers, mostly based on finely divided iron, can be incorporated into packaging for use with oxygen-sensitive products. An important packaging material category are those that absorb undesirable gases such as water vapor and oxygen.

The material property that causes a material to take up liquids with which it is in contact.Ī material that will absorb liquids or gases into itself. The Sutherland ink rub tester is an instrument commonly used to evaluate a printing ink’s resistance to abrasion. Also referred to as scuff or rub resistance.

The ability of a surface to withstand the effects of repeated rubbing, scuffing and scratching. The wearing away of a material’s surface by friction. Surface damage caused by the rubbing of a part against another part or package surface.

In effect it creates an exceptionally thin photonegative attached directly to the printing plate material. (b)In printing, intensely focused laser energy is used to impose a digital image onto the printing plate surface by ablating (evaporating away) a thin surface film (the ablation mask) to the appropriate pattern. (a)The decomposition and volatilization of solid material. A coating or film applied to a surface to prevent or reduce its adhesion to another material.

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