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FAQ

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During spraying, a large amount of adhesive disperses into the air as mist. Does this mean the adhesive quality is poor?

No, the issue is not related to adhesive quality. During spraying, the air pressure should be adjusted between 3 to 4 bar, depending on the viscosity level. Spraying should be done gently from a distance of 20 cm onto the surface for optimal results.

Does viscosity affect the quality of the adhesive?

Viscosity is not directly related to the quality of the adhesive used. The only factors that truly impact adhesive quality are the type and percentage of solid content. Viscosity merely determines the appropriate spray gun nozzle type and the required air pressure settings. As long as the air pressure and spraying distance are properly adjusted, viscosity will not affect adhesive performance or consumption.

What is the solid content of an adhesive?

Every adhesive consists of a solvent and a primary bonding component. The adhesive strength depends on the amount and type of this primary component, which is dispersed in the solvent as solid particles.

The solid content refers to the proportion of the primary bonding component that remains after the solvent has evaporated, and it is expressed as a percentage. Most standard adhesives on the market have a solid content of around 50%, meaning that in one kilogram of adhesive, approximately 500 grams are the active bonding material, and the remaining 500 grams are water or solvent.

Naturally, the higher the solid content, the greater the amount of bonding agent present, which ultimately increases the adhesive’s bonding strength.

It is important to note that solid content has no correlation with viscosity (i.e., how thick or thin the adhesive is). Many operators mistakenly consider viscosity a measure of adhesive quality, which is misleading. As mentioned earlier, viscosity is only relevant for adjusting the air pressure of the spray gun during application and does not affect the bonding performance of the adhesive.

Are polyurethane adhesives better than acrylate adhesives?

Polyurethane and acrylate adhesives differ in their chemical bonding mechanisms and adhesive performance. Polyurethane adhesives, due to their unique polymer structure, are heat-activated and provide an ideal level of adhesion. They offer significantly higher quality in terms of spray ability, heat resistance, and stability against water and chemicals under various environmental conditions compared to acrylates.

Therefore, polyurethane adhesives are the preferred choice for vacuum membrane pressing applications in industrial settings.

It is also important to note that polyurethane and acrylate adhesives are visually indistinguishable, and specialized laboratory testing is required to accurately differentiate between them.

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