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Title:
STUDS OF LINED PAPERS FOR NON-SUPPORTING WALLS
Document Type and Number:
WIPO Patent Application WO/2017/202836
Kind Code:
A1
Abstract:
The present invention relates to a stud, which stud (1) comprises walls (2, 3) about a hollow core (6), said walls (2, 3) being made up of a plurality of joined layers of paper (4) surrounding said hollow core (6), said walls (2, 3) having a homogeneous thickness (T) in the range of 2-5 mm and comprising pairs of parallel walls (2, 3), with a first pair of shorter walls (2) having a width (B) substantially less than the corresponding cross-sectional length (L) of a second pair of parallel longer walls (3), wherein said walls (2, 3) comprise 7-15 layers of a paper layer (4) bonded with glue (5) with a grammage of 100-200 grams/m2.

Inventors:
HÄRDIG, Kurt (Elovsbyn Väststugelogen, LÅNGSERUD, 661 96, SE)
KÄMPE, Patrik (Trulsövägen 5, GRUMS, 664 32, SE)
Application Number:
EP2017/062393
Publication Date:
November 30, 2017
Filing Date:
May 23, 2017
Export Citation:
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Assignee:
WOOD TUBE SWEDEN AB (Trulsövägen 5, GRUMS, 664 32, SE)
International Classes:
E04B2/74; E04C3/28
Attorney, Agent or Firm:
JOHANSSON, Lars E (Box 138, HAGFORS, 683 23, SE)
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Claims:
CLAIMS

1. A latch for buildings, which latch (1) comprises walls (2, 3) about a hollow core (6), said walls (2, 3) being made up of a plurality of joined layers of paper (4) surrounding said hollow core (6), said walls (2, 3) having a homogeneous thickness (T) in the range of 2-5 mm and comprising pairs of parallel walls (2, 3), with a first pair of shorter walls (2) having a width (B) substantially less than the corresponding cross- sectional length (L) of a second pair of parallel longer walls (3), characterized in that said walls (2, 3) comprise 7-15 layers of a paper layer (4) bonded with glue (5) with a grammage of 100- 200 grams/m2.

2. A latch according to claim 1, characterized in the relation between said width (B) and corresponding cross-sectional length (L) is such that 2B> L> 1.3B.

3. A latch according to claim 1, characterized in that said walls (2, 3) have a

homogeneous thickness (T) in the range of 2.5-3.5 mm.

4. A latch according to claim 1, characterized in that said walls (2, 3) comprise 8-10 layers of a paper layer (4) with a grammage of 170-180 grams / m2. 5. A latch according to any one of claims 1 to 4, characterized in that said paper layer (4) is joined by a polyvinyl acetate adhesive (5).

6. A latch according to any one of claims 1-5, characterized in that said paper layer (4) is made by semi-chemical fluting.

7. A latch and latch attachment device, comprising a latch (1) as claimed in any of claims 1 to 6, characterized in that the latch (1) is fixed with its ends in a U-shaped fastening device (7). 8. A latch and latch attachment device according to claim 7, characterized in that said fastening device (7) is an elongate rail with several spaced apart latches (1).

9. A latch and latch attachment device according to claim 7 or 8, characterized in that said fastening device (7) is made of a fibrous material.

10. A method of building a wall using a fastening device (1) with attachment means according to any one of claims 8 to 9, comprising fastening of parallel-mounted rails (7) longitudinally with a wall extension on the floor and the ceiling and fastening of the latches (1) with a desired distance between them with their ends in said rails (7) in such a way that the shorter sides (2) of the latches extend parallel to the longitudinal extent of the rails (7).

Description:
STUDS OF LINED PAPERS FOR NON-SUPPORTING WALLS

TECHNICAL FIELD

The present invention relates to a method of using latches of paper spaced in the construction of non- supporting inner walls as well as a method of attaching building boards that are incorporated into the building structure on them.

TECHNICAL BACKGROUND

The construction industry is affected as well as other areas of the environmental requirements that consumers demand in different stages. In addition, financial requirements are always imposed on the end products, which means there is a need for reduced costs. These requirements that are desired to be met must not be at the expense of something else, such as safety, strength, workplace environment or the like.

From, US 610308, it is known that latches can be made of materials other than conventional wood and steel, in this case of composite. From SE 7702029-5 it IS known to make a latch by combining wood and plastic materials. Composite/plastic is a significantly worse alternative from an environmental point of view than wood and it may not compete from a price point of view. In case of fire, such a latch will contain much more energy that will lead to heavy heat generation and harmful flue gases from the plastic, not just carbon dioxide.

Construction elements made from cellulose fibres, e.g. paper, would bring about many benefits in relation to the above disadvantages related to latches in alternate materials. Many solutions are known, but none that may fulfil required needs for a latch in as successful manner. From DE 29610779 there is known a modular system using building elements that are built by layers of fiber material, e.g. paper, wherein the focus is to use the paper building elements as a concrete shed to enable in situ building with concrete, i.e. providing a significantly less heavy structural element to be shipped than in conventional concrete building.

From WO 2015012692 and US 3159235 there are known foldable construction elements made up of corrugated board walls, which is rather complex and therefore relatively expensive. Further, from US 3238690 and GB 1391035D5 there are corrugated board elements in the form of supporting beams, i.e. large structural elements that are to carry heavy loads.

BRIEF DESCRIPTION OF THE INVENTION

It is an object of the present invention to greatly reduce environmental impact, price and fire risk compared with current latches, which is achieved by a latch according to claim 1.

Thanks to the invention, a structural element is obtained primarily for use in houses and other buildings where demands from consumers regarding the environment, fire risk and price can be more easily met, while at the same time building standards can be met. A latch in paper has significant environmental benefits, both in relation to composite, wood and steel. None of the previously known materials can achieve the economic benefits that a latch in paper can.

Thanks to the invention, a latch is obtained which provides an easier-to-use product with high environmental and cost advantages, which meets durability requirements, etc. in comparison with known materials, i.e. mainly steel and wood. The invention relates to a structural element which is primarily intended for use in houses and other buildings. Thanks to the invention, the working environment for construction workers will also be improved since a latch according to the invention of paper is substantially less heavy than known latches and hence better from a handling point of view, as well as possible to cut off without chip formation and with substantially noiseless methods. According to further preferred aspects of the invention;

the relation between the width (B) and corresponding cross-sectional length (L) is such that 2B> L> 1.3B, which has shown to beneficial from many

perspectives, e.g. strength.

The latch walls have a homogeneous thickness (T) in the range of 2.5-3.5 mm, which has shown to beneficial from many perspectives, e.g. strength.

The latch walls comprise 8-10 layers of a paper layer with a grammage of 170- 180 grams / m2, which has shown to beneficial from many perspectives, e.g. strength.

the paper layers are joined by a polyvinyl acetate adhesive, which has shown to beneficial from many perspectives, e.g. strength.

the paper layer is made by semi-chemical fluting, which has shown to beneficial from many perspectives, e.g. strength. It relates to a latch and latch attachment device, wherein the latch is fixed with its ends in a U-shaped fastening device, preferably an elongate U-shaped rail, preferably made of fibrous material, with several spaced apart latches (1), which provides a time and cost effective solution.

The invention also relates to a beneficial method of building a wall according to claim 10.

BRIEF FIGURE DESCRIPTION

In the following, the invention will be described in more detail, with reference to the two accompanying figures wherein;

Fig. 1 shows a perspective view of an upper part of a latch according to the invention, Fig. 1A shows a schematic enlargement of a corner of this latch, and,

Fig. 2 shows latches according to the invention inserted in a fastening rail. DETAILED DESCRIPTION

In Figure 1, a perspective view of a latch 1 is shown of one embodiment of the invention, presenting a hollow rectangular cross-section with a short wall 2 and a long wall 3. The latch 1 is made up of a plurality of joined layers of paper 4. The latch is preferably designed so that its short wall 2 has a width B which is substantially less than the corresponding cross- sectional length L of the longer wall 3, preferably the ratio is such that 2B> L> 1.3B. In a most preferred embodiment, the width B is 45 mm and the cross-sectional length L 70 mm. The thickness of the wall is chosen to be about 2-5 mm, preferably 2.5-3.5 mm. According to a preferred embodiment, the walls 2,3 comprise 7-15 layers of a paper layer 4 (see Fig. 1A) with a grammage of 150-200 grams / m2, more preferred of 8-10 layers of a paper layer 4 with a grammage of 170- 180 grams / m2. Preferably, paper is used mainly made of short- fiber pulp, more preferably semi-chemical fluting, which is an advantageous choice because the short-fiber composition causes the paper to have a tight structure that provides good strength.

The paper layers 3 are joined with glue 5. The adhesive used is preferably polyvinyl acetate, which is an advantageous choice because it is water-soluble and cost-effective. The invention relates to a latch 1 as a structural element primarily for use in houses and other buildings, which means that requirements from consumers regarding the environment and price can be met without impairing other requirements. Today, for the most part, latches are made of steel for building inner, non-supporting walls, alternatively wood, which, from several view-points, present disadvantages. With the inventive latch 1, there is provided a more easy-to-use product with great environmental and cost advantages that, in principle, meet all the requirements in terms of durability, etc., as competing materials have.

The latch 1 preferably has outer dimensions B = 45 and L = 70 mm and a hollow core 6, see Fig. 1. The construction of it has been made by winding several layers of paper layer 3 glued with, e.g. polyvinyl acetate, adhesive around a rectangular core (not shown) so that the total thickness is 2.5-3.5 mm. The paper layers are suitably made from short- fiber pulp, preferably manufactured by semi-chemical fluting.

Thanks to the invention, a latch is obtained with many advantages, as mentioned above. Further, tests have shown that with a construction element according to the invention a latch can be created of unexpectedly good strength. Below are test results produced at the test lab in BillerudKorsnas Gruvon, pressing a selected length of a latch from the side to investigate when it collapses. As shown below, the test equipment failed to collapse a latch of 450mm length. A 300mm length could handle a compression of

When used to build a wall (not shown), the latch 1 may be attached to a rail 7, which is attached parallel to the wall extension, on the floor and ceiling respectively. In Figure 2, that principle is schematically shown, i.e. how a latch 1 is attached, but here merely showing a floor rail 7 visible. The latch 1 is inserted within the rail 7 with its short sides 2 parallel to the extension of the rail 7 and secured therein with the desired center-to- center distance, preferably 450 mm, by desired attachment means (not shown) e.g. screw or nail and/or glue. Then, building boards (not shown) can be attached to the shorter sides 2 of the latches 1. The rigidity and strength when combined with building boards, such as a plasterboard, is fully sufficient to meet all the building requirements that authorities require. The rail 7 is preferably shaped in such a way that it is U-shaped, which allows for easy alignment and attachment of latch ends and good bending stiffness in two planes. The rail 7 may be a conventional steel rail, but preferably also a rail 7 made of a fiber material is used, more preferably with the same type of manufacturing principles as for the latches 1. In case of fire, the paper latch 1 will not lead heat in the same way that metal does. The paper latch 1 also contains no more than a fraction of the energy contained in a wood latch, whereby no significant amount of heat will develop by the latches in a fire. There is also only an insignificant amount of harmful flue gases in the event of fire.

A latch 1 in hollow-core paper also has the advantage of being able to process it with simple means, for example by means of a regular knife, e.g. to make holes in it for water and electricity pipes and/or to cut off it into desired lengths. In addition, it is very light weight which is a great advantage from the working environment point of view.

The invention is not limited to what has been described above, but may be varied within the scope of the appended claims. It will be appreciated, for example, that fastening of the latches can be done otherwise than by means of a rail, e.g. In the form of separate attachment members.