Adhesive tape ABC
Synthetic adhesive in which the raw materials are dissolved in a water dispersion. The dispersion is applied to the carrier film and then the liquid evaporates in a furnace. The film with the dried adhesive can then be wound onto a roll.
Binding strength between the adhesive tape and the bonded surface. A high adhesion ensures a good connection of the adhesive tape to the surface to be bonded.
Adhesive agents / primers
Chemical components which improve the adhesion and ageing properties of adhesive bonds.
Butyl adhesives consist of a mixture of isobutylene and natural rubber with embedded soot particles. A high degree of cross-linking is achieved by means of hot calendering, which ensures a very good ageing resistance. In addition, butyl adhesives are largely resistant to UV radiation and oxidation.
Binding strength between the adhesive and the carrier film. A high adhesion prevents a detachment of the carrier film from the glued surfaces and avoids adhesive residues when the adhesive tape is removed.
Different carriers are connected to each other (laminated) indissolubly, with the addition of the respective properties resulting in an optimum total carrier.
Cyanoacrylate adhesives are generally better known under the name “super glue”. They are thin or intentionally condensed esters of the cyanoacrylic acid, which are put on the market in 1K-form as monomers and which become the actual adhesive polymer by means of polymerisation reaction in the joint gap. The hardening process is activated by air humidity.
Density means the material quantity in relation to a unit of volume. The density is expressed in the weight of a cubic metre (= volumetric weight). In the field of adhesive tapes, only the density of foam carriers is of importance.
Dispersion means the extremely fine distribution of very small solids in water. In the field of adhesive tapes, mainly acrylic and acrylate adhesive dispersions are of importance. The dispersion is stabilised by the addition of emulsifiers.
Filament adhesive tape
The adhesive tape is reinforced by an additional filament layer. The result is a very high tensile strength at low elongation.
Synthetic adhesive in which the raw materials are dissolved in a melted mass. The melted mass is applied to the carrier film and cooled via rolls. The film with the cooled adhesive can then be wound on a roll.
Initial adhesive force
Refers to the immediate adhesion of an adhesive tape, however, it is no indication of quality or suitability of an adhesive tape.
Partial or complete shielding of an object against electrical current as well as external influences such as moisture, heat, cold, sound and dust.
Adhesive tape with a paper backing is called low crepe. Usually it is painted or impregnated on one side on the surface. Low crepe can be expanded by up to 15 percent of its original length.
Mu / µ
The 12th letter of the Greek alphabet. As a prefix µ means one millionth, for example 1µm = 1 millionth metre = 1 thousandth millimetre.
Newton / N
1 Newton is the force required to accelerate a mass of 1 kilogram at a rate of one metre per s².
Opaque means non-transparent and is particularly important for UV-resistant tapes.
The force required to remove an adhesive tape from a defined test surface. The adhesive tape is removed at an angle of 180° and the force is measured in N/cm.
Polyester film / PET
Polyester film is characterized by a very high tensile and tear strength as well as a very high abrasion resistance. In addition, polyester is also extremely resistant to high temperatures, lyes, oils, acids and many solvents.
Polyethylene / PE
Some carrier films are made of polyethylene. PE plastic films are soft and extremely extensible, they have a high density, but only a low tensile strength. Polyethylene is very sensitive to UV radiation. If it is exposed to daylight, polyethylene decomposes without leaving any residue. Therefore, the material is classified as environmentally friendly. However, PE films are resistant to solvents. In the field of adhesive tapes, they are important for the production of weakly adhering protective films, for underground pipe insulation as well as for the screen printing sector.
Packaging tapes are largely made of polypropylene films. PP-films are resistant to lyes, acids and solvents. They have a very high tear and tensile strength and in addition, they are extraordinarily inexpensive. As PP films are very sensitive to UV radiation, these films decompose outdoors without leaving any traces. For this reason PP films are considered to be very eco-friendly. Aluminised PP film tapes are used for bonding insulating materials.
Polyurethane plastic / PU
This plastic plays an important role as a carrier material in the form of PU foam. In addition, PU films and films with an extreme elasticity and tear resistance are produced as well. PU foam is used as a carrier for mirror adhesive tape.
Refers to the ability of an adhesive tape to absorb colour without changing visually after winding and unwinding.
The processing temperature describes the optimum temperature to be used for bonding. Normally this is a room temperature of approx. 20°C.
PVC films are often used as a carrier for adhesive tapes. While hard PVC films are used in the field of packaging, soft PVC films are used in the field of insulation. Hard PVC films are very tear-resistant and printable. Generally, PVC films have a very good UV stability. Therefore, adhesive tapes with carriers made of PVC films are often used outdoors.
There are natural and synthetic rubber adhesives. They are made sticky by means of resins and plasticisers and are processed from a solution or as a hot melt adhesive. Rubber adhesives have a high initial adhesive force; however, they have the disadvantages of poor temperature and ageing resistance and a lack of resistance to storage.
The retention period of an adhesive tape under load on a defined (or customer-specific) surface. Is indicated in minutes, often the test is terminated after 18,000 to 20,000 minutes.
Silicone adhesive is made of synthetic polymers with properties similar to rubber (elastomers), which, together with organic silicone compounds, form an adhesive with a very high temperature resistance and an extreme resistance to cold. Silicone adhesives are the only adhesives adhering to siliconised films and papers.
Normally: unprocessed, at least 12 months after receipt at the customer’s site in the original cardboard box with a relative humidity of approx. 50% and a storage temperature of approx. 20° C or according to the product information in case of special industrial adhesive tapes.
Tear strength refers to the strength of the carrier material against transverse tearing towards the running direction of the tape. High tear strength can only be achieved when using reinforcing threads.
With rising temperatures the adhesiveness increases and the adhesion force of adhesive tapes decreases (except thermosetting adhesives). With falling temperatures the adhesiveness decreases, but the adhesion force only increases in the range of average temperatures from approx. 18 ° C to 25 ° C. If adhesive tapes are stored in a cold place, they must be heated up to a room temperature of approx. 20° C before processing.
The force which is required to tear an adhesive tape. The adhesive tape is loaded in longitudinal direction and the measured force is indicated in N/cm.
Describes the special property of an adhesive to increase in hardness and adhesion force under the effect of heat. Thermosetting tapes are used in the field of electrical engineering, for the production of capacitors and in the field of coil winding.
The maximum elongation an adhesive tape experiences before it breaks. It is measured together with the tensile strength.
UV rays can be found in daylight, particularly in sunlight. They cause a chemical reaction in rubber and hot melt adhesives which can destroy the molecular structure in a very short time, in extreme cases even within minutes. Therefore, adhesive tapes containing these adhesives must always be stored in a dark place. Direct sunlight or outdoor weather conditions must be avoided by all means. Acrylic and butyl adhesive tapes are largely resistant to UV radiation.