新闻中心
Hot melt adhesive is a type of adhesive that is applied in liquid form when heated and solidifies after cooling. A carrier used for adhesives, such as water or solvents, because in reality, heat is the carrier that allows the adhesive to be applied.
In addition, most EVA hot melt adhesives do not undergo any chemical reactions, such as cross-linking or carrier removal, such as solvent evaporation. This means that; 100％ The formula is viscous and does not require obtaining the correct component ratios in the formula or during application. In addition, no additional processes such as mixing are required before or during use.
All EVA hot melt adhesives work by “wetting” the surface of the substrate that is bonded together, which is easy to achieve when the hot melt adhesive is applied in its liquid form. However, depending on the substrate temperature, hot melt adhesive may cool rapidly, which can sometimes make bonding with the second substrate difficult.
Hot melt adhesives have two main subcategories: pressure-sensitive adhesives (PSA) and non pressure-sensitive adhesives (non PSA). The difference lies in; PSA Hot melt adhesive maintains its stickiness even after cooling to room temperature, while it does not adhere properly; PSA When using hot melt adhesive, it is necessary to complete the connection of the substrate when the hot melt adhesive is very hot, in order to allow the adhesive to wet the two substrates and ensure good adhesion is completed.
Use PSA When heated, the substrate can bond, but depending on the adhesive and substrate used, this may occur at room temperature because the adhesive still has stickiness.
Characteristics of EVA Hot Melt Adhesive
The following characteristics need to be considered:; Applicable
Period stability
This is the time for the adhesive to stabilize at high temperatures. When using hot melt adhesive, it is important to ensure that the adhesive does not quickly decompose or break down at high temperatures.
Opening hours
This is the appropriate bonding time after applying the adhesive. This depends on the application temperature, as typically the higher the application temperature, the longer the opening time.
Pin
This is related to the surface viscosity, which can be referred to as thermal viscosity, or; PSA Hot melt adhesive – room temperature viscosity. Room temperature viscosity is usually measured using a rolling ball test; – Although there are various other tests, including cyclic viscosity testing.
Softening point
This is the temperature at which EVA hot melt softens; However, it will lose its cohesive strength at lower temperatures, especially under strain. Usually, rings and balls are used to measure the softening point.
Melt viscosity
This is the viscosity of hot melt adhesive at high temperatures. It is necessary to specify the temperature for measuring viscosity, as this will decrease with increasing temperature. This can be measured using a rotary spindle viscometer and a heating chamber or cone plate rheometer.
Hot melt adhesive is a widely used, low-cost, and easy to apply adhesive that can be used in various industries. Compared to many other adhesives, they are safer in the environment and pose less harm to operators, making them a great alternative. However, in order to fully utilize hot melt adhesive in each use, it is necessary to use the correct application parameters and adhesive.
1) hot melt adhesive for cartons is a common adhesive used in the sealing of boxes and cartons. 2) This is about sealed flaps. The application of adhesive is usually the end process of the production line and involves applying the adhesive at high temperatures to open the fins, and then bringing the fins into […]
How to use pearl cotton hot melt adhesive? High pressure polyethylene polyurethane foam is a kind of non chemical closed cell structure, also called EPE pearl cotton, which is a new environmental protection packaging product. It consists of thousands of individual bubbles made of high pressure polyethylene grease through physical polyurethane foam. The conventional polyurethane […]
Running a business faces enough challenges, so we want to ensure that we provide high-quality hot melt adhesive for your business to ensure your and your customers’ satisfaction. Packaging is an important component of many businesses, but sometimes its benefits are overlooked. Manufacturers rely on packaging to protect products during transportation, serve as a brand […]
Although EVA hot melt adhesive is an excellent solution for many industrial applications, it requires careful control of the high temperature during the process to avoid smoke problems. When hot melt adhesives are heated, they inevitably release some smoke. That is the odor detected while working near the hot melt nozzle. Although some smoke is […]
