FI94277B - Method for the manufacture of sandwich element - Google Patents

Abstract

Method for the manufacture of a sandwich element, which has surface plates 1 and 2, reinforcement of the outer edge 3, suction/fixing frame 4, core plates 5, suction inlet hole 6 and means of sealing 8. In order to produce a bonded joint, which does not contain air bubbles or pockets, the suction/fixing frame 4 and the core plates 5 have a slight negative pressure between the surface plates 1 and 2 and between the reinforcement of the outer edge 3 from the inlet hole 6 through holes 9 in the suction/attachment frame 4 and through grooves 7 in medium 5 to the inner surface of the surface plates 1 and 2, since the outside air pressure presses the air bubbles and pockets through grooves 7 occurring at 1-1000 kpl/m2 and through holes 9 occurring at 1-1000 kpl/m2 and through the suction/fixing frame 4 and from there in turn through the inlet hole 6 to the air system. <IMAGE>

Description

! 94277

Method for manufacturing layer elements

The invention relates to a method for the construction of layer elements and the like.

5. The method utilizes the surface plates, the suction frame and / or the air-impermeable edge material and the solid insulator or medium to adhere tightly and securely to each other by utilizing the outdoor air mat. The invention relates in particular to the manufacture of load car body elements, but is also applicable to the manufacture of a large number of other structures from different materials.

According to the traditional method, the layer elements are constructed in such a way that, for example, a frame and a support-15 lining are made of wood, it is placed on a surface plate to which glue has been applied. After that, insulation boards are installed, which can be, for example, urethane. Finally, a second surface plate is placed on top, after which the whole package is transferred to a large press with which it is pressed into an element.

20

However, the above-mentioned conventional method is relatively expensive and has a very big problem with the poor adhesion of the element parts to each other due to the large number of air bubbles and air pockets of insulation and O £.

in the adhesive between the aggregate and the surface plates, which in turn is due to the inability of air to escape properly during compression. The conventional method also does not provide three-dimensional bodies because the direction of compression can only be in one direction. Em.

In addition, harmful adhesive fumes are released into the environment in the method 30.

»

Patent publication FI 66963 again presents a solution in which the core plate is an air-permeable substance, such as foam plastic, and in which an adhesive that rapidly cures under the influence of moisture is used as the adhesive.

2,94277

Em. however, the method is limited in its application because it is not possible to produce layer elements made of a solid medium, as well as the adhesives used today are more advanced. In addition, when comparing the adhesive joint between the air-permeable core plate and the cover plate and the solid core plate and the cover plate, the latter is undoubtedly considerably stronger.

It is an object of the present invention to provide a novel manufacturing method which provides a decisive improvement in the above drawbacks.

The characteristic features of the manufacturing method according to the invention are set out in the appended claims.

By means of the invention, the poor adhesion of the parts of the layer element, which is a bottleneck of the conventional method, is eliminated and it is possible to provide various pieces with almost no manufacturing costs and low emissions of adhesive vapors into the work space. In addition, significant press investments are avoided. Other advantages and embodiments of the invention will become apparent from the following embodiment.

The invention will now be described with reference to the accompanying figure, which shows a body made by the method according to the invention, in which an air-impermeable edge material (3) 30 and / or a suction / the mounting frame (4) and the fixed grooved insulation or medium plates (5), after which the second surface plate is installed. Em. after the operations, the suction opening (6) is drilled through the air-impermeable edge material (3) and / or the suction / mounting frame (4). The vacuum 35 is conducted through the suction opening (6) to the suction / mounting frame (4), from where it is distributed through the grooves (7) in the solid medium (5) and through the holes (9) in the suction frame (4) on the surface plates (1) and (9). 2) on the lira-treated inner surface.

The outer edges of the element blank are sealed with a sealant, for example with tape (8), before the vacuum is applied. The compressive force required for gluing is caused by the outside air pressure outside the element blank. After the drying-10 reaction of the adhesive, the vacuum is removed from the suction opening (6), whereby the element is ready.

The suction / mounting frame (4) can be used in the finished element, for example, as a passage 15 for electrical and similar conductors and as a connecting piece for various elements. The air-impermeable edge material (3) can also be used to facilitate the machining of the edges and in pre-assemblies for positioning with easy screw fastening before the actual fastening, if it is made of, for example, 20 wood. The vacuum absorbs even the smallest air bubbles and pockets from the surfaces to be joined thanks to the grooves (7) in the fixed medium plates (5), and the fixed medium plates (5) prevent the surface plates (1) and (2) from collapsing.

25

The method according to the invention has been described above only by means of an exemplary embodiment, to which even substantial changes can be made without departing from the scope of the appended claims.

30 35

Claims (4)

4,94277 A method of manufacturing layer elements comprising surface plates (1,2), an air-impermeable edge material (3) and / or a suction / fixing frame (4) and a fixed medium plate (5), the layers being fixed to each other by gluing and the compressive force required for gluing provided by vacuum by sucking the vacuum inside the element through the openings (6,9) of the edge material and / or the suction / mounting frame, characterized in that a solid plate with grooves (7) on the surfaces is used to remove air bubbles and pockets from the gluing surfaces . 15 Method according to Claim 1, characterized in that a medium plate (5) is used, the surfaces of which have grooves (7) of 1 to 1000 pieces / m 2. 20 Method according to Claims 1 and 2, characterized in that a suction / mounting frame (4) with holes (9) of 1 to 1000 pieces / m 2 is used. Method according to Claims 1 and 2, characterized in that the joint between the surface plates (1, 2) and the air-impermeable edge material (3) is sealed from the outside with a sealant (8). 30 35 5 94277