When to Use loop tack tester？

Strip of material backed with adhesive

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Adhesive tape is one of many varieties of backing materials coated with an adhesive. Several types of adhesives can be used.[1]

Types

Pressure-sensitive tape

Pressure-sensitive tape, PSA tape, self-stick tape or sticky tape consists of a pressure sensitive adhesive coated onto a backing material such as paper, plastic film, cloth, or metal foil. It is sticky (tacky) without any heat or solvent for activation and adheres to surfaces with light pressure. Typical adhesives are polymers such as acrylates, natural, and synthetic rubber. These tapes usually require a release agent on their backing or a release liner to cover the adhesive. Sometimes, the term "adhesive tape" is used for these tapes.

Water-activated tape

Water-activated tape, gummed paper tape or gummed tape is starch- or sometimes animal glue-based adhesive on a paper backing which becomes sticky when moistened.

A specific type of gummed tape is called reinforced gummed tape (RGT). The backing of this reinforced tape consists of two layers of paper with a cross-pattern of fiberglass filaments laminated between. The laminating adhesive had previously been asphalt but now is more commonly a hot-melt atactic polypropylene.

Gummed tapes are described in ASTM D-01()[2] Standard Specification for Reinforced and Plain gummed Tape for Sealing and Securing.

Water-activated tape is used for closing and sealing boxes. Before closing corrugated fiberboard boxes, the tape is wetted or remoistened, activated by water. The tape is mostly 3 inch or 7.5 cm wide.

Heat-sensitive tape

Heat-activated tape is usually tack-free until it is activated by a heat source. This is particularly useful in the semiconductor industry.

Drywall tape

Drywall tape is paper, cloth, or mesh, sometimes with a gummed or PSA adhesive. It is used to make the joints between sheets of drywall materials.[3]

See also

References

ASTM D | Adhesives | Peel Testing

The &#;Loop Tack&#; test is used to measure the tack force / strength of a pressure sensitive adhesive (PSA) according to ASTM D. Pressure sensitive adhesives are typically applied to films, labels, tapes, and stickers where the initial tack force is an important characteristic of the product. ASTM D describes two ways to perform the test.

Method B uses a single purpose machine. Although the simplicity of one dedicated machine is nice, the loop tack test is not often the sole test of any manufacturer. Method A uses a universal testing machine otherwise known as a tensile testing machine. A Universal Testing Machine provides accurate test results, the same ease of use as the single purpose machine, and also allows you to perform many other common adhesive and material tests such as 90 degree peel adhesion tests, 180 degree peel adhesion tests, and standard tensile strength testing.

Prior to conducting ASTM D, it is important to read the entire specification in the relevant ASTM publication.

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