What is splicing adhesive?
Splicing adhesive refers to the adhesive used for splicing integrated materials and other wooden products, suitable for adhesives for non-structural materials and structural materials. The main component of splicing adhesive is polyvinyl acetate emulsion with excellent waterproof effect, and the curing agent is generally isocyanate. The color of the main component is a milky white viscous liquid, and the curing agent is light brown. The main component of splicing adhesive can generally be used alone as finger joint adhesive.

How to use splicing adhesive correctly?
1. Wood control: Control the moisture content to below 14%. Keep the splicing surface flat, without wavy, curved, or twisted surfaces. For easily deformable wood (such as oak, ash, etc.), they must be flattened on the same day; if left overnight, they must be re-flattened. Before splicing, remove wood dust from the wood surface.
2. Glue mixing method: When mixing glue, determine the amount of glue to mix based on the size of the glue container. Only use one-third of the container's volume for glue mixing; otherwise, the glue may react, foam, and overflow. It is recommended to choose a flat-bottomed round plastic bucket for glue mixing, as this container makes it easy to stir the curing agent evenly. Do not add water or other substances to the glue, as this will cause solidification or a sharp drop in strength. Splicing adhesive mixed with curing agent is generally required to be used within 12 hours (the effect is more noticeable after it has foamed). Unused curing agent must be strictly sealed and stored, and must not be mixed with water to avoid hardening. Once the mixing ratio of the curing agent is confirmed, it cannot be changed arbitrarily, otherwise it will seriously affect key functions such as bonding strength and water resistance.
3. Glue application amount control: Users should determine the glue application amount based on the current space temperature and humidity on that day. When the space temperature is low, humidity is high (below 80%), and the wood is hard, apply less glue. When the space temperature is high, humidity is low (below 60%), and the wood is soft, apply more glue.
4. Glue application method: Due to the high viscosity (thickness) of the glue, when applying glue, it is recommended to use a manual gluing machine, pig bristle brush, or rubber scraper to apply evenly. The glue application amount is generally controlled between 150g-250g/m² (for hard miscellaneous wood: 120g-150g/m²; for softwood: 120g-250g/m²). After the workpiece is coated with glue, it should be spliced as soon as possible to prevent film formation on the adhesive surface,causing false splicing, which can easily lead to glue line opening.
5. Pressing method and pressing time: Regardless of the pressing method used, maintain multiple points evenly pressed at 30-50cm intervals per pressure point. The control of pressing time depends on the temperature and air humidity at the work site. Except for the disc panel splicing machine, which has a pressing time of 30-40 minutes, other pressing methods are normally defined as 2-4 hours (at 25°C with humidity below 60%). When splicing under high-temperature, low-humidity conditions, the pressing time can be shortened to about one hour. Conversely, it requires 4 hours or longer.
6. Pressing inspection: When pressing, pay attention to preventing the wood strips from pulling out (unevenness and large and small ends are most prone to occur). If pulling out occurs, release pressure and reset, do not reset under pressure. Check whether there is adhesive overflow at the joint. If there is no adhesive overflow, it indicates insufficient glue application or too long wait time after gluing before pressing. This phenomenon should be corrected immediately. The pressure inspection process cannot be ignored.
7. Conditioning period after pressure release: During solid wood splicing or finger jointing, to prevent glue line opening, the spliced workpieces should be stacked and conditioned after pressure release. Based on different woods under different climatic conditions, a conditioning period should be set to ensure normal use in the next process. We recommend, under low-temperature, high-humidity, and hardwood conditions, the best time should be set to 3-5 days. Under high-temperature, low-humidity, and softwood conditions, the best time should be set to 1-2 days.
8. Handling of unused glue: If the glue mixed with curing agent cannot be used up temporarily, it must be sealed and temporarily stored, waiting for next use (it must not be exposed to air for a long time to prevent drying). This will not affect the bonding quality.