FI61332C - SKIVFORMIGT BYGGNADSELEMENT FOERETRAEDESVIS DOERR - Google Patents

Description

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«This (11> utlAggningsskkift 61 3 3 2 c (45) Patent granted 12 07 1902 Patent meddelat '(51) Kv.ik? /Int.ci E 04 B 1/94 // E 06 B 5/16 ENGLISH —FINLAND (21) P »t.nttlh.k« Inui-I * .irtinrfknln, 783830 (22, h— «MM.» - H 13.12.78 'r "(23) Alkupllvft — GlM | hatad« | 13.12. 78 (41) Interpreters | uHitoksi - Bllvlt off «ntli (29.06.79 tatMU-irkitterih.llitu * (44, NlhtMluIpMM |. Lmit | ullulM. Pvm.—„ Oo

Patent and registration authorities Ansakin uthgd och utl.skriftsn published 31.03.82

(32) (33) (31) Caught in May — B * gird prlortot 28.12.77 Sweden-Sverige (SE) 771 ^ 83 ^ -U

(71) Ji-Te Aktiebolag, Box 93, S-265 01 Ästorp 1, Sweden-Sweden (SE) (72) Hans Ström, Astorp, Bror Fries, Höganäs, Sweden-Sweden (SE) (7 * +) Oy Kolster Ab (5h) Slab-shaped building element, preferably a door - Skivformigt byggnadselement företrädesvis dörr

The present invention relates to a plate-shaped building element, preferably a door, assembled from opposing devices of combustible fibrous material. The fibrous material is then wood in solid form or in chips or porous fiber or the like. According to the embodiment which is primarily concerned and which is applied in connection with the doors, the lamellae form the inner body of the door, which consists of side-by-side bars and is located between the two outer cover layers sd.

It is known to provide building elements of this type with pa-1 protective means in mainly three different ways. Thus, the fibrous material can be impregnated with a flame retardant to provide greater resistance to burnout in the event of a fire. The second type is to treat the surface of the building elements with a flame retardant 2,61332, the function of which is to act against the adhesion of the surface of the fire and at the same time to a limited extent 1 app. Against him. The third type of fire retardant swells under the action of fire into a thick layer and thus insulates the combustible substrate from the heat generated in the fire.

In addition to these known embodiments, the present invention is characterized in that the opposing surfaces of the lamellae extending transversely towards the flat sides of the element have a coating with a salt, preferably phosphate, which at high temperature releases flame-protective components to the combustible fibrous material. Surprisingly, it has been found that with the application of the invention, up to 50% improved fire resistance can be achieved despite the fact that the coated side surfaces of the lamellae are parallel to the direction of fire penetration. Thus, according to the invention, a greatly improved fire protection is achieved, although a non-combustible material or a flame protection does not prevent the fire from sticking from the front. This may be explained by the fact that the fire front is divided into several smaller zones corresponding to the thickness of the lamellae, whereby the effect of the fire is reduced in the direction of the coatings between the lamellae.

The invention will be explained below with reference to the accompanying drawing, which shows an exemplary embodiment of a door part in perspective. In the drawing, reference numerals 10 and 12 denote two cover plates, both of which may be made of one or more layers of hard fibreboard or plywood or the like. They are glued to an inner body connected by side lamellae 14 set aside, for example in fibrous material of porous form. A frame of solid wood 16 may surround the body around the edges. According to the invention, a flame-retardant salt 18 is arranged between the opposing lamellae. non-combustible or, as the case may be, less combustible than fibrous material and having this property either by itself or after being exposed to a rise in temperature caused by fire. The salt is preferably formed from flame retardant phosphates, borates 2 or sulphates known per se. The amount of coating can be 30-150 g / m 2.

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Fire acting on the door flat side 20 shown on the main direction shown by arrow, in other words, the angle of the door plane, the coatings may be 18 delays the fire läpitunkeuLurnisaikaa up to 50%, which means a very great improvement, and which is therefore achieved even if a cover sheet 21 olevilta lamellae flank site is completely absent from the fire protection means, this is due to , as discussed above, it is likely that fire, rather than penetrating through the body as a continuous zone across the width of the door surface, can only penetrate separately into individual rods as shown by broken lines 22. Coatings 18 between individual lamellae form a barrier to the sides so that the uniform fire front breaks and is blocked.

Phosphorus releases gaseous phosphorus products at high temperatures, which can migrate and have a dehydrating effect when they come in contact with cellulose, resulting in stable carbon skins. through such.

A particularly advantageous way of manufacturing the frames of the plate-like building elements is characterized in that the sheets of the frame material adhered to one another are first coated on one or both flat sides with a flame-retardant or flame-retardant combination of substances. These plates are then sawn into rods from which the frame is joined, whereby the coating will be located on the contact surfaces between the lamellae. The lamellae do not need to be joined together with binders.

The invention is, of course, not limited to the embodiment shown, but may be modified in proportion or within the scope of the present claim.