Know Your Glass Terms
ANNEALING
A process of holding a material at a temperature near, but below, it’s melting point to permit stress relaxation without distorting the shape. A controlled cooling that prevents additional stress is often part of the process. It is often used to relieve stress created in the manufacturing processes of forming and cooling of parts.
CAPACITY
The measure, by volume, of the maximum amount that can be contained in a vessel.
CAVITY
The female component of a mold that forms the outside shape of an object when glass is introduced into mold. Moulds may contain single cavities or multi-cavities. These cavities are produced by machining, hobbing or electrical discharge equipment.
CONTINUOUS THREAD
A continuous helical bead extending around the neck of a container onto which a closure, with a matching helical bead, is screwed.
CRAZING
Very fine cracks which form a network either on, or under the surface, or through a layer of glass material.
CULLET
Recycled broken glass that is used in the manufacture of new glass.
CYCLE
The complete repeating sequence of the operation in a specific process in molding. Cycle time is measured by the elapsed time between a point in one cycle to the same point in the next.
DEBOSSING
A technique used to create pattern or designs that are recessed below the surface of moulds for easy reproduction on molded parts.
DENSITY
The weight of a gas, liquid or solid substance for a given unit of volume. For example: 1 gram of pure water occupies 1 ml of volume and 1 cubic centimeter of space.
FINISH
The upper portion of a container in which the threads for capping are located.
I.D.
Inside diameter or inside dimension.
JIG
A tool or fixture that is used for holding a component that’s to be worked on during the manufacturing, assembly or decorating process.
LABEL PANEL
The portion of a container designed to accept a decoration or label.
PUSH-UP
Describes the bottom contour of a glass or plastic container designed to allow an even bearing surface on the outside edge to prevent the bottle from rocking.
RECYCLE
Is the ability to capture, reprocess and reuse a primary material in a productive manner after its first use has been completed.
SHEAR STRENGTH
The measurement of a material that will withstand a shear force or pressure.
SCREEN PROCESS DECORATING
The printing method of passing an ink or paint through a patterned, woven fabric screen onto the desired areas of the object to be decorated. A screen can be made photographically by coating the mesh with a light active insoluble material. When the coating is washed out, the desired image remains on the open mesh.
SPRAY FROSTING
The technique of spray-coating class containers to create a frosted, matte translucent appearance.
STIPPLING
The engraving of a mould to produce a system of closely-spaced dots that are raised on surface of plastic or glass container.
STORAGE LIFE
The time that a product can be stored safely and remain suitable for use.
TAMPER EVIDENT
Any device that will show visible signs that the container has been opened.
TORQUE
The measurement of force needed to apply, or remove, a threaded closure from a threaded bottle finish. The common measurements are in inch pounds.
TRANSFER BEAD
A continuous bead located directly under the finish. The transfer bead is used in the forming process to assist in removing the container for the mould section of the glass forming machine.
VENT
A shallow channel or tiny hole in the cavity of a mould that allows resident=air and gases to escape as the material enters a cavity.
VIAL
A cylindrical container often made from glass tubing.
WIDE MOUTH
Containers with a large finish opening or those that have a large finish size in proportion to their capacity.
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