DK150352B - PLATEFORMED BUILDING ELEMENT, NAME AND DAY - Google Patents

Description

150352

The present invention relates to a plate-shaped building element, in particular a door, made up of adjacent, rod-shaped flanges of combustible fibrous material. The pipe material may e.g. is made up of 5 solid wood or shavings or porous fiber pulp. In the embodiment, which is first and foremost, used for doors, the slats form the door's inner, edge-shaped rods consisting of a core between two outer covering layers.

10 It is known to protect fire elements of this kind in three main ways. Thus, the fiber material can be impregnated with fire protection agents to achieve greater resistance to re-burning during fire-free. Another way is to surface-treat the building element with a flame retardant, which has the task of counteracting the fire's surface attack and at the same time to counteract burn-through. A third type of fire protection agent swells under the influence of fire to a thick layer and thereby insulates the flammable substrate against the heat generated by the fire.

In contrast to this prior art, a building element according to the invention is characterized in that the slats on their abutment surfaces against the neighboring slats, which faces transversely across the surface sides of the element, have a coating which includes a salt, preferably a phosphate, which at high temperature delivers flame retardant products to the fiber material.

Surprisingly, it has been found that the measures according to the invention can achieve an improvement in fire resistance of up to 50% despite the fact that the coated side surfaces of the blades coincide with the direction of fire penetration and that the surface sides of the element are unprotected against that of the fire. frontal in-35 grip. The explanation for this may be that the fire front is divided into a number of smaller zones, each with a width corresponding to the slab thickness, whereby the fire attack is weakened in the direction of the coatings between the slats.

The invention will be explained in more detail below with reference to the drawing, which shows in perspective and partly in section a section of an embodiment of a door according to the invention.

In the drawing, 10 and 11 denote two cover plates, 10 each of which may be made of one or more layers of hard wood fiber boards, veneers or similar materials. They are glued to an inner core which is composed of edged lamellar rods 14 of fibrous material, e.g. in porous form. Around the edges, the core is constrained by a solid wood frame 15 "16. According to the invention, a coating 18 of a material which gives off flame-inhibiting products when subjected to a temperature increase by fire is placed between the adjacent slats. is preferably constituted by 20 flame retardant phosphates, borates or sulphates.

The amount of coating may be 30-150 g / m.

In case of fire attack on the door side of the door in the main direction indicated by an arrow 20, ie. at a right angle to the plane of the door, the coatings 18 can delay the fire penetration time of up to 50%, even though the flank sides of the slats facing the cover plates 12 are completely free of fire protection agents. The reason for this, as indicated above, is probably the fact that instead of working through the core with a 30th continuous front over the entire door surface, the fire can only penetrate separately in the individual rods in the manner indicated by dashed lines 22. The coatings 18 between the individual slats form a lateral barrier so that the coherent fire front breaks up and 35 is damped.

Phosphorus emits mobile gaseous phosphorus products under high temperature, which upon contact with