Suzhou Oushida Hot Melt Machinery Equipment Co., Ltd.

How to adjust the viscosity of hot melt adhesive?

Suzhou Oushida Hot Melt Adhesive Machinery Equipment Co., Ltd. is a high-tech enterprise specializing in the research and development, production, sales and technical consulting of hot melt adhesive intelligent spraying equipment.

Hot melt adhesive is a plastic adhesive and an environmentally friendly chemical product. It is widely used due to its high bonding strength and fast bonding speed. Hot melt adhesive is non-toxic and odorless and is an energy-saving chemical product. It will not pollute the environment during the processing and application process, and will not cause harm to health. Environmentally friendly hot melt adhesive has passed various international environmental product certifications.

Hot melt adhesives are widely used, including express bags, labels, automobiles, packaging, disposable sanitary hot melt adhesives, book binding, etc.

Velcro is widely used in clothing, shoes, hats, gloves, purses, sofas, vehicles, seats, aviation supplies, raincoats, curtains, toys, sleeping bags, sports equipment, audio equipment, medical equipment, tents, BMX jackets, electronic wires, chargers, display utensils, etc. Velcro often requires adhesives to fix it to a certain material, such as the cuffs, and hot melt adhesives are indispensable in the production process. So what kind of hot melt adhesive is used to stick magic hot melt adhesive powder?

Hot melt adhesive is sensitive to temperature. When the temperature reaches a certain level, the hot melt adhesive begins to soften. When the temperature is lower than a certain level, the hot melt adhesive becomes brittle. Therefore, when choosing hot melt adhesive, the temperature changes in the product environment must be fully considered.

In the process of using hot melt adhesive, some customers will find that hot melt adhesive will draw. Hot melt adhesive drawing will not only cause residual adhesive on the surface of the product, but also affect the appearance of the product, resulting in rework or waste, affecting construction efficiency, and more likely to affect the bonding effect.

The reason for the wire drawing is that after the hot melt adhesive is sprayed out, part of the hot melt adhesive is stretched and extended under the action of gravity and cannot be broken in time, causing flying wires.

But in fact, theoretically speaking, the wire drawing phenomenon of hot melt adhesive is inevitable, because hot melt adhesive itself is a polymer-based product, just like chewing gum, there is a great cohesion between molecules, and it is not easy to loosen.

　　Solution to the wire drawing problem.

1. Increase the temperature of the hot melt glue machine/gun.

If the temperature of the hot melt glue machine/gun is too low, it will increase the viscosity of the glue and cause drawing. Therefore, in this case, the temperature setting can be appropriately increased, or the heating time can be extended to make the glue thinner and more fluid, and the drawing situation will be improved.

2. Choose a hot melt glue with lower viscosity.

In addition to increasing the temperature of the hot melt glue machine/gun, increasing the fluidity of the hot melt glue itself and making it have a lower viscosity at the same temperature is also a good way to reduce drawing. It can also reduce the use of hot melt glue produced by the manufacturer, reduce the energy consumption of the glue, and reduce the risk of thermal aging of the hot melt glue under long-term high temperature.

Oushida hot melt adhesive machine