Radio Frequency FAQ

Can I use any type of glue?

No, Radio Frequency glues contain a special additive known as a catalyst. The catalyst promotes the polymerization or “setting” of the adhesive as well as provides an electrically conductive path for the radio frequency field. Most Radio Frequency glues have the ability to be cured when being used in the old style of cold clamps which are some times used in the industry, so you may already be using Radio Frequency compatible glue. There are many different types of Radio Frequency glues and manufacturers. Consult your glue representative for the correct glue type for your application.

What is a Radio Frequency Press Gluer?

A Radio Frequency Press Gluer is a hydraulic or pneumatic clamping machine that uses Radio Frequency to heat and cure the glue lines in the wood when edge gluing or face laminating.  This method of curing the glue joints is the fastest method available to bond glue joints.  Radio Frequency can also be used for many other application to dry a variety of other products.  Radio Frequency waves seek the best conductor when traveling through a product and in the case of wood it would be the glue which contains water.

Why buy a RfsProtech Press – Radio Frequency Generator?

All RfsProtech Presses and Radio Frequency Generators are designed and built to produce high quality wood products. RfsProtech presses are built with welded steel structures that are engineered to minimize deflection under extreme loads, reduce maintenance downtime, and are built to with stand the harsh environments associated in woodworking factories. All RfsProtech Radio Frequency Generators consist of solid-state components and are designed in a all aluminium cabinet with premium components.  RfsProtech Radio Frequency Generators are unmatched in efficiency and production output and are the fastest generators in the world.  With over 2,000 presses and generators sold throughout the world, RfsProtech is the worlds leader in Radio Frequency technology.

How much time does it take to cure a given amount of glue area?

As a rule of thumb, 1 kW of generator power will cure 100 square inches of glue line area in one minute or 645 cm/square. For example: If the load contained a glue line area of 1,000 square inches (.645 m/square) of glue line area and the generator that is being used to cure this load is 10 kW, it take approximately 1 minute to cure this load.  This calculation can vary according to the type of glue being used due to the polymerization properties of the adhesive.

How do I calculate what size Radio Frequency Generator I should buy?

This depends on the amount of square inches that needs to be cured per day or per shift.  First you should calculate the amount of glue line or square inches each load in the press will contain.  You will need to calculate the amount of time that the generator will be allowed to cure each load in order to process the require production rate for each shift.  For loading and discharging of the material approximately 15% should be added to the cure time for each load.  If the generator size is insufficient for the amount of time allowed, then the generator size will have to be increased.  RfsProtech builds Radio Frequency Generators in the following sizes, 4 kW 6 kW 8 kW 10 kW 20 kW 30 kW 50 kW 75 kW 100 kW 150 kW 200 kW and 250 kW  RfsProtech is always ready to help our customers determine which size radio frequency press and generator is suitable to the application and production requirements.

What does kW mean?

The meaning of kW is Kilo-Watt. All RfsProtech Radio Frequency Generators are rated in kW. The higher or lower the kW number, the more power or less power is generated, therefore decreasing the amount of cure time or increasing the amount of time required to cure a product in a specified time.

Can burning occur in glue joints and how can prevent this from happening?

The curing of glue joints by means of radio frequency heating has provided the woodworking industry with a means of obtaining various glue constructions at a high level of production and a high quality of bond.However one factor which can cause trouble is internal burning in the glue joint.

One type of burn, called a breakdown or a common arc, usually appears at the edges of the glue joint.This arc may be caused by:

1. Mineral in wood.

2. Stock contains too much moisture.

3. The glue being used may be too conductive or a badly mixed glue which may concentrate at one point.

4. Excessive adhesive spread

If an arc occurs the safety circuits installed in our equipment (arc suppressor and plate overload protector), will shut the oscillator down and prevent damage to the equipment.

The other type of burning is internal to the joint and is not detected by the generator safety circuits.Here are the causes of internal burning:

1. RF voltage too great.

2. RF conductivity of the glue too great.

3. Glue spread too little

4. Joint pressure too great squeezing out too much glue, leaving none in the joint.

5. Heating cycle too long for the particular load.

6. Water soluble extractions in the wood.

7. Machining irregularities on the wood surface.

The voltage across a glue line will be uniform if the glue mix and spread is unvaried in content and the surfaces of the wood are parallel.If however, for any reason, a discontinuity or distortion exists in the uniform nature of the glue film, an area of high dielectric stress or high resistance may be established; consequently high voltage may appear across a rather short distance which will induce arcing or burning in the glue line.

It is very important that the glue be mixed thoroughly.The mix must be free of lumps; that is the catalyst has been well mixed and has had sufficient time while mixing to be uniformly dispersed throughout the mix.If this is neglected, burning may occur.

Your glue representative will be of invaluable service in the solutions and selections of the correct glue mixes for your particular needs.

What is the difference between edge-gluing and face-gluing?

Edge-gluing is when glue is applied to the edge or narrow surface of the board along the length. This is generally the procedure when gluing products into panels. Face-gluing is when glue is applied to the face or wide surface of the board. This is generally the procedure when laminating multiple boards into one thicker board, such as laminated beams, window and door parts etc. There are many more applications of gluing and are based on the unique products that is being produced.

What does pre-cure mean?

Pre-Cure is when the glue has been applied to the product and sat too long before entering the Radio Frequency press. When Pre-Cure happens you will generally see open glue joints or delamination of the parts as the glue has dried before being clamped in the press.

Can I get service for my older or non-RfsProtech machine?

Yes, RfsProtech service technicians work on any Radio Frequency Press regardless of the make or model. Either Contact us or visit the product page for more information on service.

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