Before you understand how to choose and buy conventional, summer, and winter types of pur edge banding hot melt adhesives, you first need to know the differences between them and the impact of different environments on their use. As a manufacturer with more than ten years of experience in the application of PUR hot melt adhesives, Blue Rhino Adhesives has long customized various types of PUR hot melt adhesives for furniture factories and woodworking manufacturers. Let’s analyze this issue from multiple angles.
What is pur edge banding hot melt adhesive
Pur(Polyurethane Reactive) edge banding hot melt adhesive is a moisture-curing reactive polyurethane hot melt adhesive specially used for bonding the edges of panels. Compared with traditional EVA hot melt adhesive, Pur edge banding hot melt adhesive has better bonding strength, water resistance, weather resistance, and other properties. It is deeply loved by the furniture and wood processing industries, and its market share has been gradually increasing in recent years.
How does pur hot melt adhesive bond
When using pur hot melt adhesive, first heat the adhesive to a molten state, then apply it to the surface of the substrate to be bonded, and then the two adherents will be attached. The colloid will cool quickly to produce an initial adhesion and positioning effect (physical curing); at the same time, the glue will continue to react with moisture in the air or trace moisture in the substrate to produce chemical cross-linking reaction and chain extension (chemical curing).
After the chemical reaction, a high molecular polymer with high cohesion is generated. Once cured, it has excellent waterproofness, ultimate bonding strength, chemical corrosion resistance, and extremely high weather resistance.
What are the effects of temperature and humidity on the use of pur edge banding hot melt adhesive
The curing process of pur hot melt adhesive involves physical and chemical reactions. Therefore, the ambient temperature and humidity will affect the initial viscosity, open time, and curing time of the glue.
1. Temperature influence
High temperature (summer): In summer, the ambient temperature becomes higher, which will slow down the cooling of the pur edge banding hot melt adhesive, resulting in lower initial viscosity. If the production line speed is relatively fast, it is easy to cause the edge banding strip to fall off. At the same time, the higher ambient temperature will also cause the subsequent glue curing time to become faster.
Low temperature (winter): In winter, the ambient temperature drops, which will cause the PUR edge banding hot melt adhesive to cool down faster, resulting in a shorter open time. If the production line is fast, the glue will lose its adhesion before being applied to the edge banding, which will also cause the edge banding to fall off. At the same time, the lower ambient temperature will also slow down the subsequent curing time of the glue.
2. Humidity influence
High humidity (summer): In summer, the temperature is high, it rains a lot, and the water vapor content in the air is high, which leads to high humidity. The high content of water molecules in the air will accelerate the chemical reaction with PUR hot melt adhesive and accelerate the overall curing speed.
Low humidity (winter): In winter, the temperature is low, there is little rain, and the water vapor content in the air is low, resulting in low ambient humidity. The low content of water molecules in the air will slow down the chemical reaction between water and PUR hot melt adhesive and reduce the overall curing speed.
In summary, the changes in temperature and humidity in different seasons will change the initial viscosity, open time, and curing time of the hot melt adhesive. Choosing the wrong type of hot melt adhesive for edge banding can easily cause the edge banding strip to fall off, and shift, and the glue cannot be cured.
What are the differences between various types of pur hot melt adhesives
Conventional types of pur hot melt adhesive
Applicable environment: temperature is 10°C-35°C (each pur hot melt adhesive supplier will be different), relative humidity is 50%-70%. Such a stable environment generally appears in spring and autumn or in a constant temperature and humidity workshop.
When designing conventional pur hot melt adhesives, factories will design them with moderate initial viscosity, open time (30-120 seconds), and curing speed, so that users can choose according to the conventional environment. High-end custom furniture factories have relatively high requirements for production stability and generally build constant temperature and humidity workshops. Conventional pur hot melt adhesives are very suitable for use in such factories.
Summer type pur hot melt adhesive
Applicable environment: temperature above 35°C (different for each pur hot melt adhesive supplier), relative humidity above 70%, usually in summer. In such a high temperature and high humidity environment, plus many furniture factories are in confined spaces, summer-type pur hot melt adhesive is the most suitable.
When the factory designs summer-type pur hot melt adhesive, it will reduce the initial viscosity of the glue, shorten the open time, and reduce the curing speed to ensure that the position of the edge band is fixed and the curing is completed within the open time of the glue to avoid the edge of the edge band from warping and moving.
Winter type pur hot melt adhesive
Applicable environment: temperature below 10°C (different for each PUR hot melt adhesive supplier), relative humidity below 40%, usually in winter. In such a low temperature and low humidity environment, coupled with the fact that many furniture factories are in closed and unheated production workshops, winter-type pur hot melt adhesive is the most suitable.
When the factory designs winter-type pur hot melt adhesive, it will increase the initial viscosity of the glue, extend the open time, and increase the subsequent full curing speed. Ensure that the glue can establish initial viscosity faster in a low temperature and low humidity environment to avoid the glue being unable to cure for a long time after being applied to the edge banding, which will cause the edge banding to shift or fall off after pressing.
How to choose various types of pur edge banding hot melt adhesive
1. Parameters of pur hot melt adhesive from supplier
Different pur hot melt adhesive suppliers have different technical parameters. Before use, you need to understand the technical parameters of different types of glue, focusing on the applicable temperature, humidity, and open time of the hot melt adhesive.
2. Evaluate production line requirements
Different edge banding materials and production lines have different choices for pur hot melt adhesive. You need to communicate with the pur hot melt adhesive factory about the speed of your production line, how long it takes for the board and edge banding to be glued and pressed together, and how long the open time is needed to match.After the board is edge banded, how long it will take to proceed to the next process, and how long the curing time is needed to match.
3. Small batch testing
Before changing seasons or changing the type of pur hot melt adhesive, be sure to conduct a small batch production test first. Verify whether the initial adhesion, open time, lamination effect, curing speed, final strength, trimming effect, etc. of the glue meet the production requirements to avoid large-scale losses caused by direct use.
4. Monitor the workshop environment
Install a reliable thermometer and hygrometer in the edge sealing area of the production workshop, and record and monitor regularly. When the temperature and humidity change, the corresponding type of pur hot melt adhesive needs to be switched in time.
In summary, in order to choose various types of pur edge banding hot melt adhesive, buyers need to understand the parameters of the supplier’s pur hot melt adhesive, evaluate the production line requirements, conduct small batch tests in advance, and monitor the workshop environment in real-time.
What should be paid attention to when using pur hot melt adhesive in different seasons
1. Glue coating temperature
In summer, the gluing temperature can be appropriately lowered (within the allowable range of glue melting) to improve the initial viscosity of the glue and reduce the curing time. Conversely, in winter, the gluing temperature can be appropriately increased to reduce the viscosity of the glue and improve fluidity.
2. Glue coating amount
The amount of glue applied will affect the open time. Different types of PUR hot melt adhesives have different open times. When used in factories, the amount of glue applied can be adjusted slightly within the range that does not affect the bonding strength.
3. Lamination time
The pressing time will affect the penetration of the pur hot melt adhesive. In winter, more pressing time may be required to ensure full contact between the board and the edge banding.
4. Curing waiting time
Due to the lower temperature and humidity in winter, a longer curing waiting time is required (from pressing to trimming) to ensure the strength of the glue and avoid the subsequent falling off of the edge banding.
How to buy regular, summer, winter type pur edge banding hot melt adhesive
Before purchasing conventional, summer, and winter PUR edge banding hot melt adhesives, manufacturers need to understand multi-dimensional factors such as environmental parameters, production requirements, supplier qualifications, and storage conditions. Among them, environmental parameters, production requirements, and storage conditions are factors that are easy to control, and choosing a reliable supplier is the key.
To choose a reliable pur hot melt adhesive supplier, you can examine it from aspects such as industry certification ( ISO9001, SGS test report, etc.), customization capabilities (supporting adjustment of development time according to production line speed and optimizing formula for special substrates), cooperation cases (investigating glue application experience), production scale, and service experience (including early technical development and later use services).
If you are using various types of pur hot melt adhesives in small quantities, you can consider buying them at a nearby hardware store or building materials market. However, if the usage is stable and the purchase volume is large, you can consider buying directly from pur hot melt adhesive manufacturers. After all, manufacturers have rich experience in glue application and can give reasonable suggestions based on your production line conditions.
As a Chinese factory that can customize various types (conventional, summer, winter) of pur edge banding hot melt adhesives, Blue Rhino Adhesives has more than 10 years of experience in manufacturing pur edge banding hot melt adhesives and has a deep understanding of various speed edge banding production lines and substrates. It is your first choice for choosing a pur edge banding hot melt adhesive supplier.
