halo

an undesirable, peripheral outline of a printed image or outline of adhesive around the edge of an applied pressure sensitive label.

hand laser gun

see Laser Scanner .

hand-held scanner

see Wand Scanner.

hardness

the relative resistance of a metal or other material to denting, scratching, or bending. Within the flexo industry, this term mainly relates to how hard dies are. Hardness is measured in Rockwell. The degree of hardness of a die varies based on the material that will be cut.

hardwood

lumber from deciduous trees or ones that lose their leaves in winter. It is not necessarily an indication of how hard the wood is. Some hardwoods are soft and easily worked.

He-Ne

common name for helium neon laser.

heat curing adhesives

adhesives that require a definite period of time above room temperature to develop full bond strength. The tern is usually applied to adhesives that require 180 degrees F and higher temperatures to affect a cure.

heat resistance

the property of a material which inhibits the occurrence of physical or chemical charges caused by exposure to high temperatures.

heat seal

this refers to the joining of two materials by application of heat and pressure. Some plastic bags are heat sealed to form a closure.

Helium Neon Laser

A type of laser commonly used in bar code scanners. It emits coherent red light at a wavelength of 633 nm.

HIBC

Health Industry Bar Code. The symbology and label format for use by the health care industry. Address: 5110 N 40th Street, Suite 120, Phoenix AZ 85018.

High Gloss

a roll and sheet pressure sensitive face stock that is a cast coated paper. Technicote High Gloss is Champion KromeKote. See cast coated paper.

high temperature adhesive

an adhesive that will enable a pressure sensitive label to adhere or stick well when applied to a hot substrate.

holding power

the ability of an adhesive to resist the static forces applied in the same plane as the backing. It is usually expressed in time required for a given weight to cause a given amount of label stock or tape to come loose from a vertical panel. This is another term for shear adhesion.

holland

a cloth that is pyroxylin coated. It is used as a binding tape and for hinges. Holland is stronger than Mold-On but not as strong as cambric or gusset.

hologram

the pattern on a photosensitive material or embossed into a polymeric film structure resulting from an interference pattern created by a laser light striking an object, then merging with a reference beam of the same light.

horizontal bar code

A bar code or symbol presented in such a manner that its overall length dimension is parallel to the horizon. The bars are presented in an array which look like a picket fence.

hot melt

a pressure sensitive adhesive applied to the backing in a hot molten form which cools to form a conventional pressure sensitive adhesive. All of what is applied is adhesive -- there is no carrier.

hot melt coating

application of a coating material in liquid form by the use of applied heat to melt the constituents to a sufficiently low viscosity for coating.

human-readable

the interpretation of bar code data, often printed immediately below the bar code, which is readable to humans.

hygrometer

a device which measures relative humidity of air. They vary in complexity. Simple ones are sling hygrometers. They have two thermometers. One has wet cloth over the tip. Numbers from each are aligned on a slide rule to obtain the relative humidity. More sophisticated ones have a digital read out and work automatically.

hygroscopic

the ability of an adhesive film to absorb and retain moisture. Some water sensitive adhesives could be activated by extremely high relative humidities. This would cause blocking. Some special adhesives are designed to reduce this problem when labels are used in tropical climates.