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

Criteria for Judging the Quality of Hot Melt Glue Sticks

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Hot melt glue stick is a non-toxic, odorless, environmentally friendly plastic adhesive that changes with temperature. Hot melt glue sticks can be produced in a variety of colors.


The price of hot melt glue sticks on the market is also uneven. So how to distinguish the quality of hot melt glue stick? Let's take a look.


Ⅰ. The color requirements of EVA hot melt glue sticks should be different


If the object to be connected has no special requirements for color, it is recommended to use yellow hot melt adhesive. Generally speaking, yellow hot melt adhesive has better viscosity than hot melt adhesives of other colors.


Ⅱ. Working time of hot melt glue sticks


Fast running is a feature of EVA hot melt adhesive sticks, and the running time of EVA hot melt adhesive is generally about 15s.


With the wide application of modern production mode - assembly line, the running time of EVA hot-melt adhesive is getting shorter and shorter, such as book binding and audio manufacturing, the running time of hot-melt adhesive is about 5s.


Ⅲ. Temperature resistance of hot melt glue sticks


EVA hot-melt adhesive is sensitive to temperature. When the temperature reaches a certain level, the EVA hot-melt adhesive begins to soften. When the temperature is lower than a certain temperature, the hot-melt adhesive becomes brittle. Therefore, the temperature change of the product environment must be fully considered when selecting EVA hot melt adhesives.


Ⅳ. Surface treatment of hot melt glue sticks


The surface treatment of EVA hot-melt glue stick is not as strict as other adhesives, but it is strict, but the dust and oil on the surface of the object to be connected are also treated, so that the EVA hot-melt glue can play a better role in bonding.


Ⅴ. The viscosity of EVA hot melt glue sticks is divided into early viscosity and late viscosity


EVA hot-melt adhesive can be stable only when its early viscosity is consistent with its late viscosity. The hot-melt adhesive should ensure its anti-oxidation, anti-halogen, acid-base and plasticizing properties during the production process. The viscosity of hot-melt adhesive depends on the material to be joined. Therefore, different hot melt adhesives should be selected according to different materials.


Ⅵ. The principle and advantages of hot melt glue sticks' bonding


Why do hot glue sticks stick to objects? That's because the hot melt zone is a polymer, take our common eva hot melt adhesive strip as an example. Eva hotmelt strips are vinyl acetate polymers.


When the hot-melt adhesive strip is applied to the surface of the adherend with a glue gun, the hot-melt adhesive will penetrate the surface of the adherend, and the bonding is completed during use, which is the principle of thermosetting.


When the polarity of the surface of the object is close to the EVA hot melt glue stick, the object is easier to penetrate, that is, the bonding effect is better, such as polyethylene plastic, that is, polyethylene is similar to EVA in polarity, so it is easy to bond.


However, polypropylene plastics, namely polypropylene plastics, namely polypropylene and EVA, have the characteristics of poor polarity, poor permeability and poor adhesion.


Ⅶ. The advantages of hot melt glue sticks


1. It has the advantages of fast bonding speed, good continuity, fast automation speed and low cost.


2. No solvent pollution, environmental protection, non-toxic and non-combustible.


3. No drying process is required, and the bonding process is simple.


4. The product itself is sturdy, easy to package, transport and store, with a small footprint and convenient storage.


5. Good adhesion and flexibility.


6. The hot melt glue stick can be bonded with various objects, namely bonding and sealing.


7. Good gloss, good gloss retention and good shielding.

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