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People have always been confused about the softening point and temperature resistance of hot melt adhesive. Some customers even asked what the melting point of hot melt adhesive is? Now Sunlife hot melt adhesive will answer from a professional perspective, with a detailed understanding of the differences in melting point, softening point, and temperature resistance.
Melting point: The melting point of a substance, which is the temperature at which a solid or liquid of a pure substance reaches equilibrium under a certain pressure. Due to the fact that hot melt adhesive is a mixed substance, it is incorrect to define hot melt adhesive based on its melting point. The melting point that most customers refer to is actually the softening point of hot melt adhesive.
Softening point: Softening point, the temperature at which a substance softens. Mainly refers to the temperature at which amorphous polymers begin to soften. It is not only related to the structure of the polymer, but also to its molecular weight. There are many measurement methods. Different measurement methods often result in inconsistent results. The softening point of hot melt adhesive is usually tested using the global method, with a softening point between 69-82 ℃.
Temperature resistance: It is an important technical indicator of hot melt adhesive. It refers to the temperature at which the adhesive properties of hot melt adhesive begin to change after it is firmly bonded. Ordinary EVA hot melt adhesive is suitable for ambient temperatures ranging from 0 to 35 ℃. Special models of hot melt adhesive can withstand high temperatures of 80 ℃, 120 ℃, 140 ℃, and 170 ℃. The low temperature resistance is generally -10 ℃, and some hot melt adhesives can reach -20~-30 ℃. Ordinary hot melt adhesive can meet the normal climate range.
Direct answer:Hot melt adhesive granulesAfter absorbing water, the machine may experience bubbling of the melt adhesive, white spots on the adhesive layer, and decreased adhesion. In severe cases, the entire pot of adhesive may be scrapped Hot melt adhesive particles are hydrophobic but porous particles that will slowly absorb moisture after prolonged exposure after opening. […]
Choose packaging hot melt adhesive, focus on the coreAdhesive material, production line speed, environmental requirements, delivery radiusDifferent scenarios correspond to different factories and adhesive types. Below are clear selection directions based on mainstream scenarios. 1、 Ordinary cardboard box/sealed box (universal EVA adhesive, cost-effectiveness priority) Suitable for: regular cardboard box sealing, cardboard box forming, handbag bonding, […]
First, correct the conclusion: Hot melt adhesive particles do not have better viscosity at higher temperatures. Heating for a long time above the recommended temperature of 10 ℃ will cause the colloid to oxidize and degrade, resulting in a decrease in adhesive strength instead of an increase. It can also cause a series of problems […]
Wireless glue binding machines are widely used in graphic and text fast printing stores. Common problems and solutions in the binding process of glue binding machines include: 1、 Poor quality behind the book core milling1. If the book core is not neat or placed neatly, it should be ensured that each piece of paper is […]
