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The opening time and solidification time are important specifications for selecting suitable EVA hot melt adhesive for specific applications. Choosing adhesive that meets the specifications will be one of the factors in achieving the required adhesive force.
Opening time:Defined as the time it takes to apply adhesive to the surface of a material until it forms a bond with other surface materials..
Solidification time:defined as the time required for two surfaces to form a bond and produce satisfactory adhesion..
The setting time and opening time depend on four main factors:
The current types of hot melt adhesives include EVA based adhesives, polyolefin based adhesives, polyurethane based adhesives, and polyamide based adhesives. Each type of adhesive has its own characteristics of opening time and solidification time. Most EVA hot melt adhesives have longer opening and setting times than other adhesives.
There are multiple methods to determine the opening time and setting time of glue. At the softening point, it becomes softer and flows into the flow when it reaches the melting point. Then, as it cools, the circulation moves the resilient material away from the melt.
Determine opening hours:
Apply adhesive to the surface of the material.Confirm setting time:
Spray the adhesive onto the surface of the material. Simultaneously place another surface on the bonding surface. Pressing time (2 seconds, 4 seconds); Seconds, 6 After a few seconds, we tore open both surfaces of the material. Dry and completely tear off the paper sample (in the shortest possible time), select the sample to determine the setting time of the adhesive.Analysis of aging reasons of EVA hot melt adhesive during use? Many customers encounter a decrease in viscosity and insufficient bonding strength of EVA hot melt adhesive after prolonged use. It is usually considered that the product quality is poor. However, this is not the case. This phenomenon is likely caused by the aging of […]
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Hot melt adhesive particles are a type of thermoplastic adhesive. At room temperature, it is a solid state, but due to the influence of temperature increase, it will flow softly and reach a liquid state at high temperatures. After being applied to the surface of the material, the hot melt adhesive will lose heat and […]
The weather resistance of hot melt adhesive affects its application effect. Hot melt adhesive manufacturers need to adjust the heat resistance of hot melt adhesive according to different application environments to achieve ideal application performance. The heat resistance of hot melt adhesive is closely related to its softening point. Hot melt adhesives with good heat […]
