FI76721C - Process for the manufacture of rigid frame building elements filled with hard cell plastic - Google Patents

Description

1 76721

Method for manufacturing rigid-framed building elements filled with rigid foam. - Förfarande för framställning av byggnadselement med styv stomme fylld med hardcellplast.

The invention relates to a method for manufacturing rigid-frame building elements filled with rigid foam, in which method prefabricated, rigid, dimensionally retaining, hollow frame frames are used, the cavity space being limited the elements are subjected to a compression pressure in the press, which cancels the flotation pressure applied to the body of the element from the inside.

For the time being, rigid frame building elements have been manufactured in such a way that, for example, prefabricated frame frames made of wood are stacked on top of each other between the pressure plates of a disposable press. When the elements are under compression pressure in the press, their hollow interiors are fully foamed with a thermally insulated closed cell hard foam such as polyurethane foam. The reaction time required for the flotation process causes a certain waiting time. Manufacturing capacity is limited by the degree of filling of the press. It is difficult or impossible to arrange the preheating of the elements to the optimal flotation temperature. If one element in the press breaks, the other elements will not receive sufficient pressing pressure, and the entire stack of elements in the press will be ruined.

For these reasons, among others, the possibilities of manufacturing rigid-frame building elements in a continuous press machine have been studied. The problem to be solved in this case is that a constant compressive pressure should be applied to the element continuously moving through the machine, despite the fact that the dimensions of the element may vary in different places and the dimensions of successive elements relative to each other may also vary. Dimensional variations are caused by manufacturing tolerances, moisture resistance of wood materials and other factors.

The problem can be solved by the continuous method according to the invention, characterized in that a continuous press machine (known per se for gluing) is used as a press for continuous production. by means of pressure means associated with the conveyor members, that the conveying gap delimited by the conveyor member and delimited at least on one side by the horizontal tangential plane of the transverse, parallel rollers of the machine is set smaller than the prefabricated frame frames so that the prefabricated frame frames can be displaced separately vertically against the force of the pressure member and said force is dimensioned so that for each roll v pressurizes the compression pressure in excess of the flotation pressure to keep the cover plates pressed against the frame beams at a pressure whose friction resists the internal pressure generated by the insulation flotation, and that the conveying speed is adjusted with respect to the length of the

With this arrangement according to the invention, the element itself determines the size of the compression gap, which can vary locally from one roll to another. In this case, it is ensured that each point of the element is under sufficient compressive pressure so that the pressure generated inside the element during the foaming of the thermal insulation does not disintegrate the frame of the element. There are also no problems when there is a variation in scale between successive elements.

3,76721

The machine implementing the method according to the invention can also be used in connection with the manufacture of rigid frame building elements as a gluing press for attaching inner and outer cladding panels to the beams forming the body of the element. Also in this case, despite the dimensional variations, an effective pressing pressure is obtained in all the adhesive joints while the element is constantly moving through the machine.

Due to said dimensional variations, the compression pressure between the planar conveyor members would apply only to certain parts of the element, while the other parts would be depressurized, so that the planar conveyor members are not suitable for the continuous production of rigid frame building elements.

A further advantage of the invention is that intermediate storage of the elements is not required as when using disposable presses. In addition, the method according to the invention allows the development of flotation technology, e.g. by means of preheating the elements. The warm element allows the use of cheaper foam quality and allows for a lower degree of filling, resulting in significant savings in the use of foam. The body materials of the elements are also saved, because the body does not have to be as strong as when using a disposable press. When an element breaks, the other elements are not damaged. The handling of the elements is carried out with a smaller number of personnel than with the use of disposable presses.

A preferred embodiment of the invention will now be described with reference to the accompanying drawings, in which Figure 1 shows a front view of a machine used for carrying out the method according to the invention and Figure 2 shows the same as seen from the side.

The machine comprises a lower frame 1 and an upper frame 2, which are connected 4 76721 together by screws 3 on the sides of the machine. The vertical distance between the frames 1 and 2 can be adjusted by turning the nut pieces gripping the screws 3 via the drive 9 and the chain drive 10.

Associated with the lower frame 1 are lower conveying members 4, which are formed by rollers 4a rotatably mounted in place. For transporting the elements, the rollers 4a are arranged to be rotated by a drive device 6 via a chain or belt transmission.

Attached to the upper frame are upper conveying members 5 consisting of rollers 5a, the end bearings 8 of which are associated with compressed air bellows 7. The bearings 8 are suspended from the frame 2 by a bolt suspension (not shown). The compressed air bellows 7 hold the rollers 5a with a prestress substantially equal to the desired compression pressure in a position in which the transport and compression gap between the upper and lower rollers is smaller than the smallest vertical dimension of the elements between them (taking into account tolerance variations).

On the described machine, the method is performed as follows. The rigid frame building elements are fed in succession into the transport and compression slot of the machine. The liquid components of the insulating foam are fed into the element in a known manner and the element is placed in a compression gap before the pressure caused by the expansion of the foam begins to act inside the element. The elements raise each roll 5a upwards, whereby at each roll there is a substantially equal and in any case sufficient compressive pressure despite the dimensional differences of the elements at different points in the element or between the dimensional differences between successive elements. In this case, it is ensured that sufficient adhesive pressure is applied to each adhesive joint of the elements throughout the pressing phase or that the surface cladding panels of the element are pressed against the frame beams on all sides with sufficient pressure so that the friction between the panels and beams is sufficient to resist 5,76721 insulation foaming.

When the machine is used for the production of sets of elements of different nominal sizes, the distance between the rollers 4a and 5a is adjusted by means of screws 3 to suit each production set.

Although the elements only come into line contact with each roll, the surface cladding plates of the elements are generally sufficiently rigid to prevent the plates from bending between the rolls, even under the effect of internal flotation pressure. If necessary, of course, loose reinforcement plates can also be used on the upper and lower surfaces of the elements, in which case the transport gap must be smaller than the vertical thickness of the element provided with such reinforcement plates.

Claims (5)

6,76721 A method for manufacturing rigid-framed building elements filled with rigid foam, the method using prefabricated, rigid, dimensionally preserving, hollow frame frames, the cavity space of which is limited by rigid overlays , which cancels the flotation pressure on the body of the element from the inside, characterized in that a continuous press machine (known per se for gluing presses) is used for continuous production, the lower conveyor members (4) connected to the lower frame wherein the moving elements are kept under compressive pressure by means of pressure members (7) connected to the conveyor members, that the transport gap delimited by the conveyor member, bounded on at least one side by the horizontal tangent plane of the transverse, parallel rollers (5a) of the machine is set smaller than the prefabricated frame frames, the prefabricated frame frames are fed into a transport slot which increases (7) against the force and said force is dimensioned so that a compression pressure in excess of the flotation pressure prevails at each roll to keep the cover plates compressed against the frame frames at a pressure whose friction resists the internal pressure generated by the insulation flotation, and the transport speed is adjusted, that the expansion of the filling foam and the pressure caused by it have substantially ceased as the element exits the transport gap. Method according to Claim 1, characterized in that the frame frames are preheated before they are introduced into the transport slot. 7 76721 Method according to Claim 1 or 2, characterized in that a separate reinforcing plate, not belonging to the element, is used on one or both surfaces of the prefabricated frame when the element passes through the transport gap. 8 76721 1. Förfarande för framställning av med hardcellplast fyllda Bygg-element med stela stommar, i vilket förfarande användes pre-fabricerade, stela, dimensionally stable frame of the frame, vilka halrum avgränsas av stela täckskivor, som övertäcker ramver-kets öets upp-skummas fulla med som värmeisolering fungerande hlrdcellplast med slutna Celler och elementen bringas i en press under presstryck, som upphäver det mot elementets stomme inifran riktade skumningstrycket, kännetecknat därav, att för coninuerlig framställning användes ) conveyor belt presses, other than those of the transport vehicle (4) and to the other side of the transport body (5), with the same weight as the transport unit, 7), att den verili transportörorganet angränsande transportspringan, so m atmins-tone pa ena sidan avgränsas av det vägräta tangentplanet account maskinens tvärriktade, parallellt placerade valsar (5a), in-ställes mindre än de förfabricerade ramverken, att de för-fabricerade ramverken mätäs account transportpringas, som för-stor In the case of a transport ring, the shield rollers (5a) are shown on the screen as part of the rolls of the flywheel (7) and in the same dimensional dimensions as the shield rollers, for example, the rollers are pressed against the screen. means of transport, which may be used as a means of transport, shall be used as a means of transport, and shall be subject to the conditions laid down in this Regulation, avgar fran transportspringan.