DE2111651A1 - Method and device for gluing or gluing together wood and / or plastic parts - Google Patents

Description

Professor Dr.-Ing.
Robert M e 1 last

Dipi ο-Ing.
Gustav M e 1 ά au
- Patent attorneys - K 771 gM / rd

483 Gütersloh
Vennstrasse 9

company

IMA "Kiessmann KG

c,

483 Güter sloh Oststrasse 59-61

Method and device for gluing or gluing wood and / or plastic parts together

The invention is in the field of methods and apparatus for connecting parts made of wood and / or plastics and relates in particular to gluing or gluing together such parts.

In the furniture industry in particular, they are used to connect of wooden parts or for connecting wood and plastic parts, such as laminating Plastic foils or panels or strips on wooden parts

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Glues or adhesives that set relatively slowly, for example urea glue. The advantages of such glues are: that they are temperature- and aging-resistant, they can also be designed or adjusted to be climate-, weather- and boil-proof it is also possible to make them resistant to chemical influences to a certain extent. It is also very important that such glues are inexpensive. The disadvantages are that for processing, especially for good Connection of the parts to one another, it must be ensured that the parts are pressed against one another during the setting time must be - often also expedient under the influence of heat. This pressing together of the parts is special Devices required and the pressing and setting times have a considerable effect on the production speed.

On the other hand, quick-setting glues or adhesives ^ are known, such as hot-melt adhesives, which are made of certain thermoplastics, but also belong to this Glutin and bone glues that are softened and activated under the influence of heat and solidify immediately after the heat is withdrawn and set, or set much faster under the influence of heat than the above-mentioned glues,

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However, such glues or adhesives are not heat-resistant, they are relatively difficult to process and always expensive and therefore uneconomical.

This is where the idea of the invention comes in, which has set itself the task of taking advantage of the two different ones To take advantage of types of glue or glue while avoiding the respective disadvantages. According to the invention, the special one Disadvantage of the high mechanical effort when gluing by means of slowly setting glues, as special Joining the parts, long pressing times or dry pressing, thereby avoiding that the parts to be connected with point or hot melt adhesive applied in strips, so that especially for the setting of the slowly setting glue, which is applied beforehand, no further devices are required and also very long setting glues can be used and their particularly desirable properties can be retained «

According to the invention, a method for gluing or gluing wood and / or plastic parts together is characterized in that that a hot melt adhesive is pressed into the joint of the workpieces held together. One or both of the with each other Areas of the workpieces that are to be glued are sealed with a slowly setting glue or glue before * joining Mistake. The hot-melt adhesive is used to connect them to one another

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Areas fed point by point or in places. The Glued surfaces pressed together and the hot melt adhesive sideways or through feed openings point by point into the glue joint be pressed in «, the hotmelt adhesive can also be pressed into prepared dowel holes and is an advantageous development with glass fibers or the like. mixed, or glass fibers or the like are in the dowel holes. brought in .

An apparatus for carrying out the method is characterized by a Preßpistole, consisting of a, anschIießbaren to a pressure source heatable reservoir for hot melt adhesives which opens into a nozzle or the injection port and refraction with an easily operable valve for the sub-W of the pressure supply is provided . Another device for carrying out the method is characterized by a device for continuously bringing the workpieces together with a pressure section and a feed device for slowly setting glue or glue in wide strips and hotmelt glue in narrow strips on one and / or other surface of the workpieces. In this case, there can advantageously be a supply of heat to the hot-melt adhesive in order to place it between the application point and the joining and pressing point

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- 5 melted and thus stickable to hold «,

The invention is explained in more detail below on the basis of exemplary embodiments, partly with reference to the drawings. In the drawings show:

Pig. 1 shows a schematic section through a device according to the invention;

Pig. 2 is a perspective view of another device according to the invention, shown schematically;

In the explanation of a first example for the application of the method according to the invention it should be pointed out that with « for example so far with miter joints of timber frames the glued miter surfaces joined together and with staples held together until the glue had set. According to the method according to the invention, the miter surfaces are the Lumber held together and in the joint is under high Pressure a hot melt adhesive is pressed in, which solidifies after a very short time and thus sets, so that the connection is complete and is finally established. When pressed in, the hot-melt adhesive is not only inserted into the joint, but also into the pores of the wood pressed in, so that a very good and secure connection is created,

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In the other example of the method according to the invention, holes similar to dowel holes are made in the wooden parts to be connected, into which the hot-melt adhesive is pressed. In the parts to be connected, the pressed-in hot-melt adhesive not only creates a dowel-like connection, but also the surrounding joint of the dowel hole ¹ is filled by the pressed-in hot-melt adhesive and thus improves the connection. In this exemplary embodiment of the method, it is very advantageous to fill the hot melt adhesive with glass fibers or the like, or to fill the dowel hole with glass fibers before the hot melt adhesive is filled in; the strength of the 'dowel' produced in this way is therefore considerably improved. Since the hot-melt adhesive cools down very quickly after it has been pressed in, and thus sets, the parts are firmly connected practically immediately after the hot-melt adhesive has been pressed in, and the parts can be sent for further processing.

In a further exemplary embodiment of the method according to of the invention, one or both of the surfaces to be connected to one another are first coated with a slowly setting glue or Apply glue, the surfaces are then pressed together or held together and immediately before or after the

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By pressing together, hot-melt adhesive is applied point by point or in strips between the surfaces to be connected, for example also by pressing into the joint if the surface area involved is not too large. The hot melt adhesive sets immediately after it has been introduced, holds the parts together and the slowly setting glue or adhesive can then harden and set without the parts having to be held together in a press or the like. Even further processing or processing of the parts is already possible.

With reference to the description of device examples below, the methods of the invention are described below explained in more detail.

In Fig. 1 is a device for introducing hot melt adhesive shown in a schematic section. In a cylindrical storage container 1 hot melt adhesive 2 is through a heater 3 at the required temperature kept fluid. In the storage container, the hot melt adhesive is separated by a piston ^ from a space 5, which is with a feed 6 is provided, to which a hose 7 is connected for connection, for example, to a compressed air source is. A valve 8 for closing the compressed air supply is

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loaded with a spring Io via a balance beam 9 at the opposite end of the beam and opened by a trigger 11, which acts against the pressure of the spring Io «. The trigger 11 can be arranged on a pistol grip 12, for example. At the end opposite the compressed air supply 6, the storage container is provided with a nozzle 13 which can run out into an attachment head I ^. The opening of the nozzle 13, which can be designed as a slot nozzle, is placed on the joint 15 between two workpieces 16 and 17 held together so that the outer surface of the head lh rests firmly and sealingly on the surfaces of the workpieces. Then the valve 8 is opened by actuating the trigger 11. The supplied compressed air pushes the piston forward and thus the liquid hotmelt adhesive 2 through the nozzle 13 into the joint 15 · Of course, the pressure of the nozzle on the workpieces must be higher than the hydraulic pressure of the hotmelt adhesive, so that there is no hotmelt adhesive between the nozzle head and the workpieces exit. The hot melt adhesive fills the joint 15. Just as the hot-melt adhesive emerges from the sides or lower surfaces of the joint, the feed is interrupted by letting go of the trigger 11. As it cools down in the joint, the hotmelt adhesive immediately solidifies and sets. The two workpieces 16 and 17 are firmly connected to each other «

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After the pig. 2 is a device for laminating. Plate-shaped workpieces 18 with veneers or plastic foils 19 shown schematically in a perspective view. The plate-shaped workpieces 18 run into the device via a conveyor device with endlessly revolving conveyor belts 2o and deflection rollers 21. First they run under glue application rollers 22, which apply a slowly setting glue or adhesive in strips 23 to the surface of the workpiece. On the further path of the workpiece, a hot melt adhesive is applied via nozzles 2k into the narrow strips 25 between the wide strips 23 of the applied glue and immediately behind it the veneer unwound from a supply roll 26 or the plastic film 19 is pressed onto the surface of the plate 18. During the cooling and thus solidification and setting of the hot melt adhesive in the narrow strips 25, the veneer or the plastic film is pressed by pressure rollers 27 onto the surface of the plate. After leaving the last roll 27, the veneer or the film is firmly connected to the surface of the plate 18 and is held in place until the slowly setting glue of the strips 23 is finally set. The board can already be fed to a further processing machine, for example an edge banding machine, on which the edges of the board are covered with veneer or

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- Io -

Plastic strips are glued. So there is no need for a further pressing device in which the laminated panels have to linger until the glue has finally hardened, and there are no further waiting times for the glue to set of glue to take into account.

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Claims (1)

Professor Dr.-Ing.
Robert M e 1st permanent Dipiβ-Ing. Gustav M e 1 last
- patent attorneys - Gutersloh Vennstrasse 9 K 771 gM / rd Claims; (1.)) A method for gluing or gluing together wood and / or ^ ~ ^^ plastic parts, characterized in that a hot-melt adhesive is pressed into the joint of the workpieces held together. 2 _e ) Method according to claim 1, characterized in that one or both of the surfaces of the workpieces to be glued together are provided with a slowly setting glue or adhesive prior to joining. 3.) Method according to claim 1 and 2, characterized in that that the hot melt adhesive is fed to the surfaces to be connected to one another at points or in places. 4.) The method according to claim 1, characterized in that the glued surfaces pressed together and the hotmelt adhesive sideways or through feed openings point by point is pressed into the glue joint, - 2 203839/0344 - for- AX 5.) Method according to claim 1 and k _t, characterized in that the hot melt adhesive is pressed into prepared dowel holes. 60) Method according to claim 5t, characterized in that the hot melt adhesive with glass fibers Oodgl. mixed · 7.) The method according to claim 5 »characterized in that in the dowel holes glass fibers or the like. are brought in, 8 _O ) Device for carrying out the method according to the vorstehewfen claims, characterized by a pressure gun which consists of a heatable storage container (1) for hot melt adhesive (2) which can be connected to a pressure source and which opens into a nozzle (13) or injection opening and is provided with an easy-to-operate valve (8 - 11) for interrupting the pressure supply . 9.) Device for performing the method according to the preceding claims (characterized) by a device for continuously bringing together the work pieces (18/19) with pressure section (27) and feed device (22) for slowly setting glue or glue in wide strips ( 23) and hot melt adhesive (24) in narrow strips (25) on one and / or another surface of the workpieces. - 3 -209839/0344 ir Io _β ) Method according to claim 9, characterized by a supply of heat to the hot-melt adhesive in order to keep it melted between the application point and the joining and pressing point and thus able to stick. 209839/0344 Lee r Vei t e ft