Some Basic information on Labels
A material coated with an adhesive which is self-sticking (or pressure sensitive) is referred to as a label. Unlike any label that won't stick by itself (i.e. a label to which moisture (gummed paper), heat (heatseal) or glue (plain paper) has to be applied) a self-adhesive label is pre-coated an adhesive. The adhesive itself is protected by a backing material or liner. When this backing paper is removed, the label will stick to a surface against which the adhesive side is placed. The adhesive does not need to be activated by moisture or heat- it merely requires a small amount of pressure to cause adhesion. This material is pressure sensitive! The basic construction of a pressure sensitive label consists of five layers:
1) The face material, on which information and/or design is printed.
Things to look for before you order:
-What is the surface to be labeled?
The GOLDEN RULE is to TEST FIRST. It must be up to the end-user to make sure he has the right label (with the right adhesive) for the job.
It is recommended that the following TEST FOR ADHESION is carried out before ordering:
-Apply several sample labels to the surface of the product.
-Leave for a minimum of 24 hours.
There are a number of surfaces to which SATISFACTORY ADHESION IS DIFFICULT. The ones most likely to be encountered are:
-Low energy surfaces (such as those that are silicone treated or contaminated, chemically treated for corrosion resistance, waxed or greasy, or printed polyethylene).
-Rough surfaces where surface contact is likely to be low (such as wood, metal, lacquered finishes, cork, foam, open weave fabrics, embossed finishes and unglazed pottery).
-Moist or cold surfaces (such as those caused by condensation, ice or deep freezing).
-Irregular shaped surfaces (such as glass phials, ampoules or spirit miniatures where the label is applied to a convex surface of less than 25mm diameter).
-Dusty surfaces (such as plaster, asbestos and Fiberglas).
There are also a number of SURFACES WHICH CAN BE DAMAGED by the application of self-adhesive labels. The more usual ones are:
-Plasticized plastics (such as PVC).
-Weak bonded surface finishes (such as flock coated fabrics and acrylic vehicle paint).
-Some glass surfaces (such as optical lenses).
The best way to store labels
Store labels in their original boxes and under stable temperature and humidity conditions (in the range of 60-80°f, and at 50-60% relative humidity). Extremely high humidity must be avoided at all times- as this will almost certainly result in curled sheets and wavy edges.
When Storing Labels:
-Do not stack label boxes directly onto the warehouse floor.
-Do not store near to sources of heat, or in direct sunlight. High temperatures can affect the adhesive properties- and result in possible penetration and discoloration of the face paper.
Instructions for the Printing Room
-Condition all label sheets in their original packages for at least 24 hours, keeping them at printing room temperature and humidity levels.
Care for Material Surface to be labeled
-Make sure that the product being labeled is totally free from condensation (condensation occurs when a cold surface is brought into a warm atmosphere).
Tips for the printer when using our labels
-Do not remove labels from their boxes nor leave labels exposed for long periods of time before commencing printing. (Changes in relative humidity can affect the stability of the sheets.)
All Worldlabel.com brand labels have face papers or film which has a smooth, or very smooth, surface. When printing large areas of solid by offset litho, this allows a very high degree of contact between the blanket and the surface of the label- resulting in the label often being plucked from the backing sheet by a 'suction type' action. This effect is particularly evident when the solid area extends to the edge of the label.
For more information and assistance, please contact us.
Worldlabel's experts are ready to help!
Call us toll free: (877) 955 2235