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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.Answer directly The cover of the express envelope is self-adhesive, and it is recommended to use one that has fast initial adhesion, good adhesion to PE and paperHot melt adhesive granulesApply a strip-shaped adhesive line, and the sealing can be controlled by sticking or tearing. The key lies in the opening time and the balance […]
EVA hot melt adhesive is different from regular cold melt adhesive. According to its characteristics, the following points must be mastered and noted during use: 1、 Understand and master the models and technical performance (including technical parameters) of each EVA hot melt adhesive. Different types of hot melt adhesives have different opening and curing times. […]
The core of Guangzhou flatbed hot melt adhesive isMoisture and heat resistance, good leveling, strong initial adhesion, and adaptable opening timePriority selectionModified EVA (mass production) or PUR (high-end)Accurately match according to the substrate, equipment, and season, avoiding “soft in summer and brittle in winter, opening glue in the south”. 1、 Guangzhou climate pain points (key […]
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 […]
