(1)Hot melt adhesive: A polymer-based thermoplastic adhesive coated in the melting state and cured after cooling

(2)Polymer: A substance, such as rubber, plastic, fiber, that has a long chain molecular structure consisting of repeating units and is also a polymer material

(3)EVA: ethylene-vinyl acetate copolymer. It can be used as the basic polymer of hot melt adhesive and widely used in the manufacture of hot melt adhesive

(4)TPU: thermoplastic polyurethane. There are polyester type and polyether type, which can be used as the basic polymer for manufacturing hot melt adhesive

(5)PA: Polyamide, commonly known as nylon. It is a general term for polymers containing amide groups in the repeating unit of the main chain of macromolecules. It can be used as the basic polymer of hot melt adhesive

(6)PES: Polyester resin. It is esterified by polyacid and polyol. The polyester used for hot melt adhesive is a thermoplastic product of straight chain molecule obtained by esterification of saturated dibasic acid and dibasic alcohol. There is no unsaturated carbon-carbon bond in the molecular structure, so it is a saturated polyester

(7)Thermoplasticity: The property of repeatedly melting and solidifying under the action of heating and cooling

(8)Viscosity: An indicator of fluid fluidity, high viscosity and poor fluidity. It is related to fluid properties, temperature, concentration and so on

(9)Stickiness: or initial stickiness, refers to the ability to stick to other objects under slight pressure

(10)Opening time: refers to the glue from coating to the surface can still be glued to the substrate the longest time interval, glue in the opening time to have bonding effect

(11)Curing time: the adhesive is pressed between the two substrates to form the shortest time of firm bonding, the pressure holding time should be no less than the fixed time to form a good bonding

(12)Cohesion: Microscopic term for the strength of a material, similar to tensile strength

(13)Thermal stability: The ability of a material to withstand high temperatures for long periods of time

(14)Melting point range: The range of temperature measured by capillary method from initial melting to complete melting of the substance

(15)Low temperature resistance: The ability of hot melt adhesives to maintain good bond strength or adhesion at low temperatures

(16)Heat resistance: The highest temperature that the bonding system can withstand without breaking the bond

(17)Water resistance: The ability of a material to retain its physical and chemical properties after exposure to water or moisture

(18)Durability: Durability is also known as stability and service life. That is, the ability to maintain its performance for a long time under the combined action of external environmental factors

(19)Aging resistance: refers to the degree of bonding strength or viscosity change over time in the storage process of bonding system at room temperature