Zero joint - Requirements

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How does the zero joint succeed?

A successful zero joint depends not only on the edge, the functional layer or the applied technology, but also on the woodworking machine and the material quality of the workpieces. The zero-joint gluing can be carried out by machine with an edgebander or a CNC-machining centre with an edgebanding aggregate. Manually guided zero-joint edge banding machines are suitable for building construction where edgebanding is carried out on the building site.

The challenge here is: With zero-joint gluing, there is no adhesive mass between the edgeband and the workpiece plate which could compensate for any unevenness in the narrow side. Precision is therefore the top priority.

Mechanical engineering requirements

Machine frame

Solid machine frame, which absorbs vibrations

Premilling unit

The premilling unit is the decisive prerequisite for achieving a permanent joint between panel and edge, no matter what adhesive or technical method is used. Clean cut edges without tear and microcracks on the workpiece surface are decisive for durability.
Cutter material: Diamond
Tool geometry guarantees chip-optimised and noise-reduced processing, e.g. LEITZ DFC tool technology, LEUCO i-System, etc.
Axle angle between 43° and 70°
Setting: The decisive factor is the exact same immersion depth the cutters of the co-rotating and counter-rotating spindles, so that there is no step at the end of the narrow side.

Edge finishing units

Sharp tool ensure a switches cut and prevent the still soft edge from being pulled off the narrow surface of the workpiece.
Precisely and repeatable adjustable

Spraying device

The edgeband must have cooled down sufficiently after contact pressure until it is finished by the trimming saw and the edge milling aggregate so that the material does not smear when the tools hits it. The use of an antistatic coolant sprayer has proven to be particularly effective in combination with hot air technology. The spraying of antistatic coolant in joint with compressed air nozzles ensures that plastic chips do not adhere to the tracing discs of the edge milling aggregate.
Spray attachments for cutting and cleaning agent are not necessary.

Setting requirements

Input of the correct parameters into the machine controls or the zero joint unit; the edge manufacturers provide the edge-specific data or offer their help in running in the edge they produce. The following parameters are decisive:
Type of the functional layer
Edgeband height
Workpiece feed rate

Material requirements of the workpieces

A watertight zero joint can only be achieved with perfect processed material.

MDF board must be pure fibre panel without wood or plastic chips, which construction a different counterpressure to the edgeband than the surrounding fibre material
Flat-pressed chipboard must be tightly filled without holes which represent a point of attack for the capillary forces of water.

Retrofit an existing machine

In order to retrofit an existing machine with a zero joint unit, the sanding from top mentioned technical requirements must be met.

Basically, there is no change in the construction and sequence of the aggregates. Only in the area of adhesive application, the zero joint unit is installed instead of a hot-melt glue system.

Many manufacturer of edgebanders offer the retrofitting of zero-joint units in hot air technology for their own machines.