Optimal Working Concentrations for Hot Melt Adhesives

The so-called optimal working concentration refers to the maximum working concentration of the adhesive under certain conditions such as a certain environment and a certain speed to ensure a good coating state of the adhesive.

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In compounding, if the working concentration of the adhesive is very low, in order to ensure the amount of glue on the dry basis of the adhesive, the only way to increase the amount of wet glue when the adhesive is coated is to choose a mesh roller with a lower line number to ensure it. Doing so will bring a series of problems, such as high glue application cost, insufficient drying, decreased transparency of the finished product, and low production efficiency.

Factors Influencing Glue Viscosity

In the case of a certain amount of glue, from an economic point of view, the best working viscosity is naturally the higher the better, but the actual working concentration is determined by the working viscosity. The premise of high-concentration coating is that the glue transfers well and can be well leveled after transfer, and the working coating viscosity is directly related to the transfer and leveling effect of the glue. Of course, the suitable working viscosity of the glue is closely related to the operating conditions such as the parameters of the mesh roll and the speed of the machine.

The viscosity of the glue is not only directly affected by the working concentration, but also the temperature has an obvious effect on the viscosity. The higher the temperature, the lower the viscosity, which is why the coating effect of the same concentration of glue in winter and summer is not the same.

The meaning of optimal working concentration

1. Reduce costs

When the product requires a certain amount of gluing, as the amount of ethyl acetate decreases and the working concentration increases, the cost of gluing per unit area decreases.

2. Reduce energy consumption

If too much ethyl acetate is used in the preparation of the adhesive, there will be too much ethyl acetate to volatilize, and the energy consumption will also increase. The ethyl acetate in the adhesive is useless after the adhesive has transferred to the substrate and the adhesive has leveled.

3. Improve production efficiency

The drying capacity of any piece of equipment is limited. If the working concentration of the adhesive is too low, under the condition of limited drying capacity, in order to completely volatilize the ethyl acetate in the adhesive, the only way is to reduce the speed. Especially in the case of insufficient drying, there will be serious bubble appearance defects, which will affect the peel strength and the resistance of the adhesive layer.

4. Improve product quality

Reduce the amount of ethyl acetate, reduce the amount of wet glue on the substrate, reduce the coating thickness, avoid or alleviate the problem of skinning on the surface of the adhesive during the drying process, and improve the transparency of the composite film.

 

As a professional manufacturer and supplier of hot melt adhesives, Purking always believes that the more expensive the hot melt adhesive, the better the fit. Purking Hot Melt Adhesive is committed to providing customers with the most suitable solutions with favorable prices and high-quality products.

 

In the future, Purking hot melt adhesive will keep up with the development trend of the industry, actively improve its own equipment, innovate technology, and strive to become a hot melt adhesive industry advantage with environmental protection advantages, technological advantages, product advantages, and brand advantages.