What are the ways to stick hot melt adhesive?

2021/03/15

       There are two types of hot melt adhesives: hot bonding and cold bonding. In fact, they are bonding in two different physical states. Today we will talk about the difference between cold bonding and hot bonding.


1. Cold bonding: In the application of pressure-sensitive hot melt adhesives, cold bonding will be used more. The self-adhesive bag sealant is more common in life, which is the cold bonding method of hot melt adhesive, and the self-adhesive bag is produced in proportion It will not be pasted immediately. When the hot melt adhesive is already cooled when it is pasted, the cold bonding method can only be used, and the cold bonding will not cause overflow of the glue, and the damage to the surface of the substrate is small. Just gently press the quilt. The bonding substrate can be adhered tightly.


2. Hot sticking: it is very common in the application of sticking after glue, such as furniture edge banding, shoe material outsole, large board flat sticking and so on. The hot bonding method requires the use of a hot melt glue machine to heat the glue, turn the glue into a liquid state and then apply it to the substrate to be bonded. The liquid glue will fill up the crevices and textures on the surface of the substrate, and even enter the substrate. Internally, the two substrates are firmly bonded together.


     Cold sticking and hot sticking solve the problems in different adhesive application fields. In fact, the liquid glue molecules have different degrees of activity. The molecular structure of hot melt adhesive has become relatively stable in the cold bonding state, and it is very convenient to paste; when the hot melt adhesive is used in the hot bonding state, its molecules become very active when heated, which can impact the molecular structure of the substrate surface, even with The molecular structure of the substrate is fused, which shows that the thermal bonding effect is better.