Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
  • B05C5/002—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the work consisting of separate articles
  • B05C5/004—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the work consisting of separate articles the work consisting of separate rectangular flat articles, e.g. flat sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
  • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
  • B27G11/00—Applying adhesives or glue to surfaces of wood to be joined

Definitions

• the invention relates to a method and a device for applying glue and hardener components of a multi-component glue system to the surface of wooden parts. Numerous methods for applying glue to the surface of wooden parts are known.
• DE 38 34 027 AI relates to a method for applying a ready-to-use glue to the surface of wooden parts.
• the ready-to-use glue which already contains mixed glue and hardener components, is kept circulating in a circuit via a storage container, a pouring head provided with a guide element, under which a feed device for wooden parts is arranged, and a collecting trough. It is applied as a pouring film to the surface of the wooden parts.
• DE 24 16 032 C3 describes a method for gluing wooden parts, wherein hardenable liquid plastic glue and liquid hardener are applied separately from one another to one of the surfaces to be joined and these are then pressed together. Glue and hardener are applied in the form of relatively thick, parallel strips using a strip distributor and mixed together by pressing the surfaces to be joined together.
• WO 99/67028 relates to separate application of resin and hardener components in the form of strands, by spraying or by a combination of the two application methods.
• a device for applying multi-component glue systems is known, for example, from WO 99/67027.
• the device comprises at least two hollow elements, at least one element per component, which have a number of openings.
• the respective component in the form of strands is placed through the openings on a substrate which is located under the hollow element.
• the openings can be aligned above the order level.
• the object of the invention is therefore to provide a method and a device which avoid the disadvantages of the prior art. Furthermore, several application methods should advantageously be combined with one another in one application device.
• this object is achieved by a method for applying glue and hardener components of a multicomponent glue system to a surface of wooden parts by means of an application device, the glue and hardener components being alternatively adjustable, applied separately or mixed ready for use with the application device. It is advantageous that, depending on the requirements of the production situation, it is easy to switch from one process to the other.
• a multi-component glue system consists of at least the two components glue and hardener and optionally further components, for example hardener additives, which act as accelerators.
• glue and hardener additives which act as accelerators.
• the glue and hardener components are applied separately, the components are mixed while they are being applied to the wooden surfaces or at the beginning of the pressing together of the wooden parts to be glued. This avoids the risk of the application device being clogged by hardening glue residues and consequently experiencing operational disruptions or the need for frequent cleaning of the device.
• the glue When applying the ready-mixed components, the glue contains all components required for further processing or curing, such as solvents, catalysts, hardeners, additives and auxiliaries, fillers and extenders, before application.
• the ready-to-use glue places certain demands on the open drying time. On the one hand, the drying time should be long enough to prevent the applied glue from drying too quickly on the wood and to allow the wood parts to be glued to be processed within a certain period of time. On the other hand, the shortest possible pressing time is desired after the press has been closed. As a result, the glue should harden quickly after the glued wooden parts have been assembled.
• both application methods are carried out by the same application device.
• the selection of the respective application method depends, for example, on the wooden part to be glued, in particular on its size and shape, and on the glue and hardener components to be used, in particular on the reactivity of the respective system. The user decides on the optimal application method and the glue and hardener components used.
• the application device is preferably a device for applying the glue and hardener components as strands or layers on the wooden surface.
• the separate glue and hardener components are applied to the surface by the line or film casting process or a combination thereof.
• the components are applied to the wooden surface to be glued in the form of parallel cords or strands.
• the cords or strands of the components are usually applied side by side. It is also possible that Apply hardener strands with the glue strands in cover to avoid undesired direct contact of pure hardener and wood surface.
• the separately applied components are already partially mixed. The actual mixing and subsequently the hardening of the binder then takes place after the pressing pressure has been applied.
• a casting film is created that covers the entire surface of the surface to be glued. Wooden parts with a uniform layer of glue or hardener components are obtained, which can be used to manufacture glued wooden parts.
• the hardener component cast film can be applied to the glue component cast film or vice versa. If the hardener contains components that can damage the wood surface, the glue component casting film is preferably first applied directly to the wood parts and then the hardener component casting film thereon. It is also possible to cover the applied glue and hardener films with another glue application, e.g. to avoid the risk of wood damage from acids contained in the hardener and the acid hardener coming into direct contact with the wood.
• a casting film made of glue components is first applied to the wooden part to be glued and then strands of hardening components or vice versa.
• the ready-to-use mixed glue and hardener components are applied as a glue liquor to a wooden surface using a cord or film casting process.
• a cord or film casting process As a result, either strands or an even layer of the glue-hardener mixture are applied to the surface of a wooden part.
• the method according to the invention allows the use of various types of liquid glue.
• a possible two-component glue system to be applied according to the method according to the invention is known from DE 196 03 988 AI.
• the multicomponent glue system to be applied preferably comprises at least one of the following glue components: urea-formaldehyde resin (UF), melamine-urea-formaldehyde resin (MUF), melamine-urea-phenol-formaldehyde resin (MUPF), phenol-resorcinol-formaldehyde resin (PRF), resorcinol - formaldehyde resin (RF), phenol-formaldehyde resin (PF), Polyvinyl acetate (PVAc) or another glue component common in wood processing.
• UF urea-formaldehyde resin
• UMF melamine-urea-formaldehyde resin
• MUPF melamine-urea-phenol-formaldehyde resin
• PRF phenol
• the present invention furthermore relates to an application device for carrying out the method according to the invention, which comprises at least two application parts, at least one first application part which can be put out of operation is used for applying hardener components and at least one second application part for optional application of glue or mixed hardener. and glue components.
• the at least one first application part is used to apply the hardener components and the at least one further application part is used to apply the glue components.
• the at least one first part of the order is not deactivated.
• the at least one application part for applying hardener components is put out of operation if ready-to-use mixed glue and hardener components (glue liquor) are to be applied. This mixture is then applied to the wooden surfaces by the at least one application part, which is used either to apply the pure glue components or the mixture.
• a machine for the separate glue hardener application from the prior art can be modified such that the application part for the hardener application can be put out of operation. This can be triggered by the electronic machine control.
• the mixed glue liquor is then alternatively processed via the machine part for the glue component application.
• the glueing process is preferably completed with glue components (raw resin) in the glue component application part and these are pumped sufficiently during the period of the machine's standstill, so that cleaning of the machine is not necessary If the machine is to stand still for a longer period of time, the machine must otherwise be cleaned, as the residues harden and consequently only mechanically are to be removed. Furthermore, avoiding these residues saves costs because no residues have to be disposed of.
• the present invention furthermore relates to the use of the method according to the invention for the production of wooden parts which contain at least two individual parts made of wood or wooden materials (e.g. chipboard, MDF, OSB, etc.) connected by gluing, e.g. for the production of glulam.
• Glulam made from glued wood lamellas is generally known. Glulam is used, for example, as a material for load-bearing components in commercial, residential or public buildings. It is characterized by very high strength and rigidity with low weight, high dimensional stability and dimensional stability and high-quality surfaces. It can be produced in any length, shape and profile. For production, lamellas are glued, stacked on top of each other and then pressed. After the glue has hardened, the plywood can be processed like solid wood.
• the application device according to the invention is preferably used when using the separate application method for the production of standard glulam parts, at least one application part being used for applying hardener components and at least one further application part being used for separate application of glue components. Due to the short open time, lamellas with separately applied components are primarily suitable for the production of standard glulam parts of limited dimensions. Standard parts are manufactured in certain common sizes in stock and for picking
• the application device is preferably used to produce (optionally bent) glulam parts with the mixed-in application process.
• drive used the at least one application part for applying hardener components is deactivated and at least one further application part is used for applying mixed hardener and glue components.
• the submixing process is more suitable for order-related, possibly more complex shaped components (object components).
• the limiting factor is the drying time that can be achieved with separate components and thus the amount of running meters of wood slats to be glued until the drying time is reached, at which the press must be closed at the latest. A longer drying time can be achieved with mixed glue and hardener components.
• Examples of such object components are gable roof supports or fish belly supports.
• the tensioning process after gluing requires time which can exceed the drying time of a separately applied glue hardener system.
• the longer time of the mixing process has to be used.
• Large object components can reach dimensions with up to several 1000 meters of slat length to be glued.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Dry Formation Of Fiberboard And The Like (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Veneer Processing And Manufacture Of Plywood (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 2002
  • 2002-05-07 DE DE2002120382 patent/DE10220382A1/de not_active Withdrawn
• 2003
  • 2003-05-07 WO PCT/EP2003/004773 patent/WO2003095105A1/de not_active Application Discontinuation
  • 2003-05-07 EP EP03732320A patent/EP1506061A1/de not_active Withdrawn
  • 2003-05-07 AU AU2003239842A patent/AU2003239842A1/en not_active Abandoned
  • 2003-05-07 PL PL03373458A patent/PL373458A1/xx not_active Application Discontinuation
  • 2003-05-07 RU RU2004136163/04A patent/RU2331511C2/ru not_active IP Right Cessation
• 2004
  • 2004-11-04 NO NO20044801A patent/NO20044801L/no not_active Application Discontinuation

Non-Patent Citations (1)

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