Brief analysis of hot melt adhesive open time and curing time and influencing factors

Brief analysis of hot melt adhesive open time and curing time and influencing factors

Company Profile

Suzhou Oushida Hot Melt Adhesive Machinery Equipment Co., Ltd. is a high-tech enterprise specializing in the research and development, production, sales, and technical consulting of intelligent hot melt adhesive spraying equipment.

Hot melt adhesive
is a plastic adhesive whose physical state changes with temperature within a certain temperature range, while its chemical properties remain unchanged. It is non-toxic and odorless, making it an environmentally friendly chemical product. It is widely used in industries such as health, food, home furnishings, automotive, packaging, electronics, and footwear.

During the hot melt adhesive application process, the hot melt adhesive machineis one factor that affects the adhesive’s adhesion. Another important factor is the hot melt adhesive‘s open time. The hot melt adhesive’s open time and curing time are closely related to the adhesive’s bonding speed. Therefore, the following briefly analyzes the factors that influence the hot melt adhesive’s open time and curing time.

What are open time and cure time?

Definition

Open time: The maximum time between application and when hot melt adhesiveremains bonded to the substrate. Hot melt adhesives achieve optimal bonding within this open time. Choose the adhesive based on the substrate’s requirements; open times vary depending on the adhesive. Please consult the adhesive manufacturer for details.

Cure time: The minimum time it takes for hot melt adhesive to form a firm bond between two substrates. The hold time should be at least the cure time for a good bond to form. The adhesive should be selected based on the conveyor length, conveying speed, seasonal variations, and other factors.

Factors Affecting Hot Melt Adhesive Open Time

1. Hot Melt Adhesive Properties. Open time is programmable; different adhesives have different open times, so you can choose the right one based on your needs.

2. Ambient temperature. Low ambient temperatures cause the hot melt adhesive to cool faster, shortening the open time.

3. Substrate temperature. Low substrate temperatures accelerate the hot melt adhesive’s cooling and shorten the open time.

4. Glue application amount. Increasing the amount of glue applied decreases the specific surface area of the hot melt adhesive, slowing down its cooling rate and thus extending its open time.

5. Glue application method. Applying a glue application method that reduces the specific surface area of the hot melt adhesive can slow down its cooling, thereby extending its open time.

Overview of Oushida hot melt adhesive intelligent spraying equipment: