During the traditional manufacturing process, glue is typically what is used to bond the insole together after it has been assembled. On the other hand, the laminated product gives off a pungent odor that is neither hazardous to human health nor harmful to the environment. This is because the glue has a sizeable amount of solvent already contained within it. As a consequence of this, Foamwell products are the ones that are most highly recommended for the process of applying hot melt adhesive film to insoles.
It is possible to obtain an adhesive that is solid when it is at room temperature but turns into a liquid when it is heated to a higher temperature. This type of adhesive is referred to as a hot melt adhesive film. It is a polymer product that is harmless to the surrounding ecosystem, lacks any color or odor, and is devoid of any kind of solvent. It is easy to work with and does not easily leak glue, so it can be used in a wide variety of applications, such as in clothing and underwear, products for children and water treatment, shoe materials, and other industries. Additionally, it has a wide range of applications. At this time, an increasing number of factories are bonding insoles with hot melt adhesive films. This may be as a result of the influence of policies or the improvement in quality. This is the trend that the industry is currently following toward the development of the industry in the future.
Why do you recommend using hot melt adhesive film for the insole bonding process?
When it comes to insole bonding, the types of hot melt adhesive films that work the best are EVA and low-temperature TPU films.
When it comes to the application of insole bonding, it is recommended to use the hot melt adhesive film of EVA composition rather than the low-temperature TPU composition. This is because, depending on the material of the insole foam, the low-temperature TPU composition may not be as effective. The melting point of the EVA composition is what determines this preference the most. If the bottom material is EVA foam, then you should use the hot melt adhesive film that is also made of EVA. If not, then you should use something else. It is more appropriate, and if it is only the bonding and compounding of two fabrics, it is recommended to choose a hot melt adhesive film with TPU composition because the same-sex attracts. If it is only the bonding and compounding of two fabrics, however, it is not recommended. This is due to the fact that people of the same gender tend to attract one another. The name of the EVA component in Chinese is, which translates to "vinyl acetate copolymer" in English. This component is very similar to EVA foam in terms of the molecules that it contains;Choose a hot melt that has components that are comparable to those of the polyurethane (PU) foam you will be utilizing because the Chinese name for the TPU component is polyurethane.
This is important to keep in mind when making your decision. Polyurethane and polyurethane foam share a great number of the same components. The adhesive film is better suited for bonding, and the TPU hot melt adhesive film adheres (has a higher viscosity) to the fabric in a more effective manner.
The actual operating temperature can reach between 80 and 100 degrees Celsius, whereas the melting point of EVA and low-temperature TPU hot melt adhesive films is relatively low at only about 80 degrees Celsius. This difference in melting point is due to the fact that the actual operating temperature can reach between 80 and 100 degrees Celsius. This is done in order to improve both the safety of the material that has been adhered and the productivity of the manufacturing process. Because the melting point of the hot melt adhesive film is so high, the temperature of operation that is associated with it will be higher. As a consequence of this, it is very easy to damage the foam during the lamination process, which in turn will have an effect on the quality of the product. For example, it is very easy to cause the material to become flatter or to cause the foam to melt.
Putting insoles together using hot melt adhesive film and its various steps.
In the vast majority of circumstances, the process of bonding the insole only needs one layer of the adhesive to be applied. In other words, in order to effectively improve production efficiency, knitted fabric, foam, hot melt adhesive film, and three layers are compounded together. When purchasing a hot melt adhesive film, it is not necessary to choose a release paper; all that is required is the film itself to complete the purchase. Apply it in this manner:The heat is transferred through the knitted fabric by inserting the hot melt adhesive film in the gap between the knitted fabric and the foam, and then using professional pressing equipment to heat from the side of the knitted fabric (this is because the foamed side is thick and has a difficult time conducting heat). After this step, it is necessary to wait for the adhesive film to cool before continuing with the subsequent punching and other processes. Additionally, grinding is one piece of production equipment that is utilized by some manufacturers. This is because melting the middle layer of the hot melt adhesive film is necessary in order to allow the fabric and the foam to be bonded together. The insole foam or rubber is directly formed in the abrasive tool, in a manner that is comparable to the process of fabricating specialized gloves.
This is accomplished in a manner that is analogous to the following:This is in direct opposition to the methods that were discussed earlier. During the subsequent lamination with the cloth, this abrasive tool is used once more for the subsequent lamination. It is necessary to use professional equipment in order to create a self-adhesive cloth that can be used for combined applications. First, the hot melt adhesive films must be backed to one side of the fabric (one side of the cloth, one side of the adhesive), and then a second lamination must take place with the bottom foam or rubber material.
