What is PSA material?
Pressure Sensitive Adhesive Tape (also known as: PSA, self adhesive, self-stick adhesive) is a major category of adhesive tapes and is a relatively thin flexible material with single or double sided coating. PSA will adhere to a variety of substrates when applied to most clean and dry surfaces with pressure.
What is pressure sensitive adhesive made out of?
They are typically formulated from natural rubber, certain synthetic rubbers, and polyacrylates. Pressure sensitive adhesives can be supplied dissolved in organic solvents, as an aqueous dispersion, as a hot melt, or coated on release liner as tape.
How do you make a pressure sensitive adhesive?
One chemistry is achieved through the use of a solvent. With this method, the adhesive components (usually rubber or acrylic) are dissolved in a solvent and then coated onto a web. The solvent is then evaporated using heat and air flow, leaving a dry yet sticky adhesive (pressure-sensitive) that is wound in a roll.
What is pressure sensitive adhesive polymer?
Pressure sensitive adhesives are viscoelastic polymers with their rheology tuned to the desired bonding and de-bonding characteristics needed. Typical materials used to make the adhesive include: acrylate polymer, rubber, either natural rubber or synthetic thermoplastic elastomer.
What is acrylic PSA?
Acrylic PSAs adhere well to many substrates and have a good overall balance of cohesive properties. Acrylic polymers used in PSAs are: Soft. Capable of wetting the adherend surface. Capable of enough cold flow to fill any surface irregularities.
What is 3m PSA?
According to the Pressure Sensitive Tape Council, three characteristics define a Pressure Sensitive Adhesive (PSA): Permanent tack. Adhesion with light pressure. No liquid-to-solid phase change.
How is adhesive tape made?
Adhesive tapes consist of a material called a backing or carrier (paper, plastic film, cloth, foam, foil, etc.), which is coated with an adhesive and a release liner if needed. The adhesive-coated backing or carrier is then wound up to form a long jumbo roll of tape.
How do you increase PSA adhesion?
Having moisture on the substrate will promote a poor bond. Abraded: Roughing up the surface with sand paper can create more surface energy and provide a slight grip for the adhesive to attach to. PSA can flow into a rough surface to maximize bond strength based on higher contact area.
What is acrylate adhesive?
An acrylic adhesive is a resin-based adhesive comprised of acrylic or methylacrylic polymers. They are extremely strong and efficient in bonding multiple objects together and are very environmentally resistant.
What is the difference between PSA and wag envelopes?
Changing from Water Activated Gum (WAG) stamps to Pressure Sensitive Adhesive (PSA) stamps for large coils. Currently, all of the Postal Service’s stamps are in PSA format except the lower denomination stamps (1, 2, 3, 4, 5 and 10 cent) which are in 3k and 10k WAG coils.
What are the components of a radiation cured PSA?
The conventional liquid UV-curable PSA is comprised of four essential components: oligomers, monomers, photoinitiator and additives. A typical formulation for a radiation-cured adhesive is provided in Table 1. The wide choice of raw materials available allows maximum latitude to achieve the desired properties.
What kind of oligomer is used for PSA?
The oligomer used in PSA applications is generally a multi-functional elastomeric polymer, such as an aliphatic urethane acrylate. Oligomers provide much of the shear strength in the UV PSA formulation. However, selection of the oligomer will also affect more viscous properties, such as tack and peel strength.
What are the rheological properties of a PSA?
The correct rheological properties for a PSA require a careful balancing of these properties. To counteract the viscous flow, PSAs are based on very high-molecular-weight rubber polymers. These polymers rely on the entanglement of molecules to restrict flow.
What is the function of acrylate in PSA?
The acrylation imparts the unsaturation or C=C group to the ends of the oligomer; this serves as the functionality. The oligomer used in PSA applications is generally a multi-functional elastomeric polymer, such as an aliphatic urethane acrylate.