Help using our labels
Some Basic information on LabelsA material coated with an adhesive which is self-sticking (or pressure sensitive) is referred to as a label. Unlike a 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 with an adhesive which 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 - it is pressure sensitive! The basic construction of a pressure sensitive label consists of five layers:-
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?
-Is the label to stick permanently, or is removable adhesive required?
-Is the label required to stick permanently under 'deep freeze' conditions?
-To avoid problems it is important that both the printer and the end-user is aware of the importance of these questions. Within reason, self-adhesive laminates can be produced for almost any labeling requirement but the manufacturer cannot be held responsible if the application is incorrect.
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.
-Low energy surfaces such as those that are silicone treated or
contaminated, chemically treated for corrosion resistance, waxed or
greasy, or printed polyethylene.
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
The best way to store labelsStore labels in their original boxes and under stable temperature and humidity conditions in the range of 60-80°f 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.
Store boxes on pallets with a solid surface or in suitable racks. 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.
Do not stack more than 10 packages high.
Do not stand or rest heavy objects on or against label boxes.
What should you do in the Print Room-Condition label sheets in their original packages for at least 24 hours at printing room temperature and humidity levels.
-Fan label sheets prior to printing to take out any residual static.
Cover unpacked label sheets left overnight with polythene. This will afford protection against temperature and humidity changes.
-Repack label sheets in original boxes after printing.
The area to be labeled-Make sure that the product being labeled is totally free from condensation as occurs when a cold surface is brought into a warm atmosphere.
-Make sure that, when labeling containers, no product spillage has occurred. Also, that the container to be labeled has not been handled with greasy or oily hands.
-Make sure the surface is free from dust. When goods are stored for long periods dust can collect on the surface.
-If the labels are applied by hand make sure they are being rubbed down firmly and not merely placed on the surface.
-Take the backing paper away from the label prior to application so as to keep the label as flat as possible. If the label is taken away from the backing paper it is almost certain a memory curl will be implanted which will tend to make long-term adhesion difficult.
Tips for the printer when using our labels-Do not remove labels from their boxes and leave exposed for long periods of time before commencing printing. Changes in relative humidity can affect the stability of the sheets.
-When the job is completed, if material is too wet to pack and distribute on the same day, wrap some plastic or suitable material over the work so temperature changes overnight will not affect the stock.
-Before printing ensure that the labels are compatible with the surface they will be adhered to. It is too late once they have been printed.
-If heavy ink saturation is required, add tack reducer to ink in recommended proportions to eliminate the possibility of non-release from the blanket cylinder.
-Always have your ink manufacturer confirm the suitability of the reference number to be used on the surface of the label.
-Adjust printing pressure as necessary.
-When printing, ensure spray unit is switched on and remove completed stacks in sensible levels.
-When printing register work, carry out a side lay check or run 10-12 sheets through press twice and check.
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.
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