1. Factors causing degumming - adhesive quality and formulation
The quality and formulation of adhesives are key factors affecting whether kraft paper tape degumming occurs. If the adhesive itself has insufficient bonding strength, for example, if the content of adhesive components in its composition is too low or the quality is poor, it is easy to cause degumming. Some low-cost, low-quality adhesives may not undergo strict quality control during the production process, and the proportion of components is unreasonable. In addition, if the formulation of the adhesive does not take into account the use environment, such as in a high humidity environment, some water-resistant adhesives will absorb too much water, thereby reducing the viscosity and causing degumming. For example, in a humid environment, the starch-based adhesive will absorb water and swell, reducing the bonding effect.
2. Factors causing degumming - storage and environmental conditions
Improper storage conditions and use environment can also cause degumming. In a high temperature environment, the adhesive may soften, reducing the viscosity of the tape. Long-term exposure to sunlight or high temperature will accelerate the aging of the adhesive and reduce its bonding performance. Humidity is also an important factor. As mentioned earlier, a high humidity environment will cause the tape to absorb moisture, while in a low humidity environment, the tape may become dry and brittle, resulting in a weakened adhesion between the adhesive layer and the adherend. In addition, if the tape is squeezed during storage, the bonding force between the adhesive layer and the kraft paper will be destroyed, and degumming is also likely to occur.
3. Factors causing degumming-surface characteristics of the adherend
The surface characteristics of the adherend have a great influence on the viscosity of the tape. If there is oil, dust, moisture or other impurities on the surface of the adherend, it will hinder the effective contact between the adhesive and the adherend and reduce the adhesion. For example, when packaging metal parts with oil stains, the oil stains will form a barrier layer between the tape and the metal surface, causing the tape to be unable to adhere firmly. In addition, the roughness of the adherend surface is also critical. An overly rough surface will reduce the contact area between the tape and the adherend, thereby affecting the viscosity.
4. Preventive measures for degumming
To prevent kraft paper tape degumming, first of all, you should choose a high-quality adhesive to ensure that its adhesion and stability meet the requirements. When designing the formula, the use environment should be considered, such as adding waterproof and moisture-proof additives. For storage conditions, the tape should be stored in a cool, dry, well-ventilated environment, avoiding direct sunlight and the influence of high temperature and high humidity. Before use, make sure that the surface of the adherend is clean, dry, free of oil and impurities, and the surface can be treated by wiping, polishing, etc. At the same time, when pasting the tape, apply appropriate pressure to make the tape fully contact with the adherend to improve the bonding effect, thereby effectively preventing the occurrence of degumming.
