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Edge Banding with Optical Zero Joint

In edge banding, not only the durability of the bond but also the perfect appearance is of great importance. The “optical zero joint,” an edge without visible adhesive joint, is used here as a quality feature. Robatech’s adhesive application solutions achieve this quality standard. In addition, they are efficient in operation as well as in maintenance and thus achieve significant cost savings compared to roller application systems.

Highest Quality in Edge Banding

Woodworking requires the highest quality and efficient processes for flat lamination, profile coating, and edge banding. The variety of panel and edge materials and the use of different adhesives call for flexible and efficient solutions. In addition, the digitization trend affects the degree of automation of the plant and thus the technology and software to be used.

To achieve the quality standard of an “optical zero joint,” PUR hot melt adhesives are often used for the edge banding of kitchens, bathroom and laboratory furniture. Compared to EVA hot melt adhesives, PUR hot melt adhesives are resistant to temperature, water, and chemicals. This ensures a high and long-lasting adhesion even with small application quantities. Thus, adhesive application can be reduced to a minimum, thus, reducing costs.

Traditionally, roller application systems are used for edge banding. A so-called open system consists of a pre-melter that melts adhesive and fills it in a basin, and a roller that applies the adhesive to the substrate. Rather closed systems with melter and wide slot-type nozzle head are currently used as an alternative. In terms of application quality, cost optimization and efficiency, closed systems are unbeatable.

The Right Solution for Your Requirements

Whether EVA, polyolefin or PUR adhesives are processed, whether a basin is filled using a pre-melter or a complete nozzle system is required, Robatech offers the right solution. The Robatech melters can be connected to the host machine via a variety of interfaces and integrated into existing systems.

In edge banding with a slot-type nozzle, hot melt adhesive is applied to the exposed sides of materials such as MDF, plywood, and coated chipboard or blockboard and chipboards, as well as kitchen countertops. The desired adhesive application width can be set automatically or manually. Depending on the panel material, edge strips made of PVC, ABS, acrylic, melamine, wood or wood veneer are pressed onto the glued edge after adhesive application. A layer of edge sealant can be applied first for porous panels. The result is a smooth surface, which allows to achieve an optical zero joint in the subsequent edge banding.

Using the closed nozzle system, the adhesive amount can be fed precisely and applied with excellent repeat accuracy. This reduces adhesive consumption to a minimum and achieves significant savings over a roller system. In addition, the efficiency is increased by short cleaning times, fast adhesive/color changes and ease of operation. Furthermore, the pivotable mounting bracket of the coating head allows an easy adjustment of the contact force and a flexible positioning of the coating nozzle relative to the workpiece. Double-sided machines benefit from consistent spare parts since the same coating head is used for left-hand as well as right-hand guidance. Optimal positioning together with adhesive quantity control and the adhesi­ve retraction system achieve repeatable gluing with clean cut-off.

Advantages at a Glance

Optical zero joint thanks to precise and repeatable adhesive application
Clean cut-off with adhesive retraction system
Fast set-up times and ease of operation
Host integration and data analysis for process optimization

Advantages of nozzle system vs. roller application system

Increased productivity through fast set-up times and reduced maintenance
Better adhesive quality, no contamination, and therefore excellent adhesion
Process reliability through temperature monitoring across the entire system
Integrated pattern control with automatic length control
Up to 25 % less adhesive costs compared to roller application

Components

RobaPUR 2 MOD

RobaPress

MultiMelt

EdgePro

EdgePro

Robatech AG

Pilatusring 10
5630 Muri
Schweiz  
Tel +41 56 675 77 00
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