Hangzhou Ren He Hot Melt Adhesive Co., Ltd.
Hangzhou Ren He Hot Melt Adhesive Co., Ltd.

Factors Influencing the Bonding Effect of High-temperature Hot Glue and The Applications

Ⅰ. Factors affecting the bonding effect of high temperature hot glue

(1) Hot melt glue material

Viscosity: High temperature hot melt adhesive affects fluidity, permeability, spraying performance, glue temperature, wire drawing, glue output, etc.

Softening point: High temperature hot glue affects the temperature, heat resistance, curing speed, etc. of the adhesive.

Opening time: High temperature hot melt adhesive affects operational applicability, permeability and bonding strength.

Curing speed: High temperature hot melt adhesive affects production speed and bonding strength.

Affinity: High temperature hot melt affects the bonding strength.

Cohesion: High temperature hot glue affects transfer resistance, peel strength or shear strength.

Hot adhesion: High temperature hot melt adhesive affects the bonding effect.

Temperature resistance: High temperature hot melt adhesive affects the temperature that the final bonding system can withstand.

(2) Substrate

Polarity: The polarity is similar. The high temperature hot melt glue has a good bonding effect if the polarity of the substrate is similar.

Density: Loose substrates are easy to permeate, requiring a short period of time and high pressure; the opposite is true for dense substrates.

Surface tension: Insufficient surface tension will affect wetting and bonding. Corona treatment and sanding help improve bonding.

Ink: The polarity, density, and adhesion of the ink to the bottom paper will affect the bonding effect of the hot glue.

Surface temperature: If the surface temperature of the substrate is too low, it will affect the infiltration, open time and penetration of the glue, and if it is too high, it will prolong the curing time.

Moisture, surface treatment agents (such as talcum powder) and pollution: Seriously affect the bonding strength.

Adsorption and transfer performance: Seriously affect the aging and adhesion of hot glue.

(3) Equipment and technology

Speed: High-speed production lines often reduce the requirements for open time, but increase the requirements for curing speed.

Glue temperature: The temperature of the glue used for lift-off will extend the open time and reduce the curing speed.

Opening distance: opening distance/production line speed = equipment opening time. It should have a shorter opening time than the hot glue.

Pressure: Sufficient pressure helps the hot melt adhesive to penetrate, infiltrate and cure.

Pressure-holding time: It should be designed so that the pressure-holding time of the equipment is longer than the curing time of the hot melt adhesive.

Glue amount: Increase the amount of glue used to replace the infiltration and penetration of high-temperature hot glue, extend the open time, slow down the curing speed, and make the curing faster.

Ⅱ. Application of high temperature hot glue

The high temperature hot melt adhesive has good heat resistance, moisture resistance and strong bonding strength. So what are the main uses of high-temperature hot melt adhesives?

(1) Solvent-based hot melt adhesive for multiple uses

In the production of medium temperature hot melt adhesives. Such as hot melt transfer, liquid crystal data sealing, wallpaper anti-counterfeiting, painting and calligraphy pasting, computer printing, food production date typing, wire and cable agent coding are all the properties of hot melt adhesives.

However, the existing granular or powder formulations cannot be used, and they do not need to be made into a liquid form in the presence of a suitable solvent and coated on a certain substrate to obtain a thin and uniform film before it can be used in the subsequent production process. Due to the different types of solutes (hot melt adhesives), it can be made into solvent-based hot melt adhesives with a variety of uses.

(2) Hot melt adhesive for edge banding of furniture

Usually, most furniture is made of fiberboard, shavings or sawdust board, and the edge parts of the furniture board must be bonded with hot melt glue to increase the aesthetics, just like solid wood furniture. Check our good wood glue for furniture.

(3) Hot melt adhesive for fabric

Glue for polyester fabric is mainly used in the production of garments, shoes and hats. The clothes using hot glue not only have a crisp, plump appearance, but also have the characteristics of being naturally gentle after washing, and can be worn without ironing. Shoes and caps using the rubber are light and breathable, and have good shape retention. They are especially used in the shoe industry, and they also have the advantages of wearing comfort and reducing shoe odor.

(4) Hot glue book binding and hot melt packaging adhesive

At present, the packaging and sealing of food, beverages, instant noodles, cigarettes, beer, medicine, etc., are mostly completed by sealing machines with medium-temperature packaging glue.

The bookbinding industry has now abolished the old thread and binding and switched to hot glue book binding technology, which not only improves the binding quality, but more importantly, greatly accelerates the binding speed.

(5) Hot melt pressure sensitive adhesive for daily use

Hot glue is mainly used in sanitary napkins for women, children's diapers, mattresses for sick mattresses, and incontinence products for the elderly. Especially the latter, as China's population structure continues to age, the demand for elderly incontinence products will increase rapidly.

Choose Renhe air filter adhesiveadhesives for automotive industry and medical skin glue.

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