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A new adhesive line with further improved quality and efficiency in bonding of load-bearing wooden structures

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In the production of wooden structures, Kiilto Pro SW, a new line of one-component polyurethane adhesives, can boost the bonding process by up to 30%. The adhesives meet the requirements of EN 15425:2023 I 90 GP 0.3 w (adhesive type I). The different stages involved in the production of engineered wood have been extensively studied in developing the adhesive. In addition to improved production efficiency, this attention to detail can be seen in the excellent foaming properties of the adhesive. These properties reduce the need for adhesive in production.

Wood construction is becoming increasingly popular, as it contributes to achieving the goal of carbon neutrality. Wood is also a warm, safe and aesthetic construction material. Cross-laminated timber, or CLT, has provided the industry with new opportunities, and log construction has once again become popular.

Kiilto has developed a new adhesive line, offering a wide range of technical solutions for the engineered wood industry. The Kiilto Pro SW line is suitable for applications requiring strength and quality that can withstand decades of use. According to Business Development Manager Juha Rinne of Kiilto, the product’s applications include not only cross laminated timber but also roof trusses, glulam beams, log construction and structural finger jointing.



The open and pressing times of Kiilto Pro SW have been optimised for each production process.


Optimal ratio between open and pressing time

As RDI Manager Jussi Hänninen of Kiilto points out, the required open time of adhesive vary, depending on the number of layers that the CLT element is to be made up of – for example, three, five or seven.

“The Kiilto Pro SW line includes options with an optimal ratio between the open and pressing times. This way, the customer can choose the adhesive that is best suited for their factory and production.”

Often, the optimal solution for the engineered wood industry is one with a long open time but the shortest possible pressing time.

“Usually, when the pressing time is divided by the open time, the resulting coefficient is 2.5. However, with the Kiilto Pro SW line, in standard conditions the coefficient can be as low as 1.5,” says Hänninen.

Rinne calculates that optimising the ratio between the open time and pressing time can help increase the efficiency of the bonding process by up to 30%.

“In other words, productivity can also be improved by simply changing the adhesive, without the need to invest in a new press, for example.”
 


With the Kiilto Pro SW products, the squeeze-outs from the bond lines dries quickly and thoroughly.


Less adhesive – without compromising on quality

“The adhesive spreads well and penetrates the wood during the pressing phase. A high-quality bonding result can be achieved with less adhesive, which reduces production costs. Material efficiency also contributes to environmental friendliness,” Rinne points out.

The product is highly shear-thinning, meaning its viscosity is high when stationary and decreases during movement.

“A highly shear-thinning adhesive can be pumped at lower pressures while maintaining the adhesive bead in place in vertical bonding, such as finger joints and edge bonding,” Hänninen describes.

With the Kiilto Pro SW products, the squeeze-outs from the bond lines dries quickly and thoroughly. Once the squeeze-out is dry, it does not leave adhesive residues in the blades of the planes. This, on the other hand, means that the blades do not need to be sharpened and replaced as often as before.


Juha Rinne (left) and Jussi Hänninen are pleased with the properties of the new adhesive.


Bio-based option on the way

Wood construction is already a good option for achieving a lower carbon footprint in construction. If the carbon footprint of the end products is to be further reduced, there is also an option for that.”

“Kiilto will also launch a product with identical technical properties but made of partly bio-based components instead of fossil ones. The proportion of bio-based materials can be up to 25%,” says Hänninen.

Read more about the Kiilto Pro SW series

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