DK1936064T3

DK1936064T3 - Fugebånd

Info

Publication number: DK1936064T3
Application number: DK07120847.4T
Authority: DK
Inventors: Dr Claus-Peter Berneth; Dr Gottfried Philipp; Andreas Marquart
Original assignee: Knauf Gips Kg
Priority date: 2006-12-21
Filing date: 2007-11-16
Publication date: 2016-02-08
Also published as: DE102006060787A1; ES2561158T3; EP1936064A1; EP1936064B1

Description

Joint strip Description [0001] The invention concerns a joint tape for reinforcing of fillers, wherein the joint tape comprises a coherent, continuous, or perforated basic structure according to the preamble of claim 1, as well as a method for manufacturing a joint tape for reinforcing of fillers according to the preamble of claim 19, as disclosed in JP-A-10 018 543.

[0002] Traditionally, the problem is that joint tapes which are used to reinforce a filler in the transition region between two building panels or two precast concrete parts are hard to work with, because they develop waviness and/or poor adherence on the wet filler.

[0003] The problem which the present invention proposes to solve is to create a joint tape having improved processing and functional properties. At the same time, a method for the manufacturing of such a joint tape should be indicated.

[0004] This problem is solved with a joint tape according to the features of claim 1, as well as a method according to the features of claim 19. At the same time, a joint assembly is claimed in which at least one joint tape according to the invention is used.

[0005] Advantageous embodiments are indicated in the subordinate claims.

[0006] According to one key notion of the present invention, the joint tape comprises a basic structure being coherent, continuous or provided with openings, and wherein the joint tape has an anchoring structure on at least one side, preferably both sides, formed by a plurality of fibres firmly joined to the basic structure in a partial region and standing free or projecting by the fibre ends.

[0007] The anchoring structure with the plurality of free projecting fibre ends accomplishes an efficient adherence of the joint tape in the still wet, and especially dried filler.

[0008] By fibres is meant in general structures which are thin and flexible in regard to their length. Fibres essentially can not withstand any compressive forces, but only tensile forces, since they give way or even buckle under compressive loading.

[0009] According to the invention, the basic and the anchoring structure of the joint tape engage such in the filler that the joint tape does not form waves but remains flat and adherent on or in the filler in horizontal as well as vertical position of the filler surface.

[0010] It has been found, surprisingly, that the desired flat lying with good adhesion on or in the filler as compared to the waviness often occurring with joint tapes of the prior art can be achieved in that a joint tape according to the present invention is chosen such that the joint tape's tensile strengths both in the longitudinal and transverse directions to the fibre main direction in the wet state account for at least 30%, preferably at least 35% of the respective tensile strengths of the joint tape in the dry state.

[0011] By wet state is meant here a state of the joint tape in which the joint tape is completely soaked. The choice of a joint tape with the above sufficiently high tensile strength in the wet state as compared to the dry state and the providing of a plurality of free fibre ends surprisingly results in a joint tape with significantly improved processing and functional properties. Experiments have shown that such a joint tape lies flat and adheres well and does not form waves even when soaked throughout.

[0012] Preferably, tensile strengths of the joint tape of over 70 N, preferably over 100 N will be provided for a width of 15 mm longitudinally to the main fibre direction in the dry state. In the wet state, tensile strengths of the joint tape of over 25 N, preferably over 50 N will preferably be assured for a width of 15 mm longitudinally to the main fibre direction.

[0013] Transversely to the main fibre direction, tensile strengths of the joint tape of over 42 N, more preferably over 50 N, will preferably be achieved for a width of 15 mm in the dry state. Likewise transversely to the main fibre direction, tensile strengths of over 15 N, more preferably over 20 N should preferably be assured in the wet state for a width of the joint tape of 15 mm.

[0014] With the joint tape according to the invention, an adhesion of the joint tape to filler of at least 0.6 kg, preferably at least 0.8 kg, more preferably 1.0 kg, can be achieved with an essentially uniform application of 1000 g/m2 or an application around 1 mm thick, after complete drying of the filler Uniflott ® from Knauf Gips KG or the equivalent, at 90° pull-off of the joint tape and at a width of the joint tape of 50 mm.

[0015] Advisedly, per mm2, at least 5, preferably 8, further preferred more than 10 fibres firmly joined to the basic structure, but projecting with a free fibre end of at least 0.4 mm in length, preferably at least 1 mm in length, further preferred at least 2 mm in length or more, are provided.

[0016] Preferably, the overall length of the fibres forming the anchoring structure is between 0.4 mm and 5 mm.

[0017] The thickness of the basic structure of the joint tape in one preferred embodiment is under 350 pm. A minimum thickness can be, for example, 100 pm.

[0018] Moreover, it can be provided that the fibres forming the fibre ends at least for the most part have a thickness between 0.01 mm and 0.1 mm.

[0019] The joint tape is preferably formed with a weight per unit area of at least 80 g/m2, preferably at least 100 g/m2.

[0020] In a first preferred embodiment, the basic structure and the anchoring structure are formed from the same materials or components.

[0021] In another possible embodiment, the anchoring structure is created while producing the basic structure.

[0022] Preferably, the anchoring structure can be created by roughening, especially brushing the basic structure. A forming of the material web into a finished joint tape of desired width can be done before or after the roughening.

[0023] But in an alternative embodiment it is also possible that the anchoring structure is created by applying fibres having free end or ends on a basic structure, wherein the basic structure and the anchoring structure can be formed from the same materials or components or from different materials or components.

Both procedures can optionally be combined in that at first there is a roughening of the basic structure and then additional fibres are placed on the already roughened basic structure to achieve the anchoring structure according to the invention.

[0024] The joint tape can be made of a fibre system from fibres of a uniform material or as a mixture of different materials. In particular, it can be a fibre mixture of organic and inorganic fibres. Examples of inorganic fibres are: glass fibres, stone wool fibres and examples of organic fibres are: cellulose fibres, polypropylene fibres, polyester fibres.

[0025] The basic structure can be in the form of a closed, continuous web (e.g. paper, cardboard, nonwoven or fabric) or a web with openings, e.g. in the form of an open nonwoven or open fabric, grid, net, perforated web or stamped web.

[0026] Moreover, it can be provided that the basis structure is provided with a stamping, especially grooving and/or with a total or partial coating and/or with a complete or partial printing.

[0027] In one particular embodiment protection is also sought for a joint assembly comprising two abutting building panels formed especially as gypsum boards, plaster boards, gypsum boards with fibreglass fabric cover layers, gypsum fibreboards, cement-bonded thin-walled boards or calcium silicate boards, or two or more abutting precast concrete parts, wherein a joint that is filled with a filler is formed between the building panels or precast concrete parts, and the filler is reinforced by at least one joint tape according to the present invention.

[0028] Finally, a method is also indicated for manufacturing a joint tape to reinforce fillers, wherein a basic structure which is especially in the form of a closed, continuous web or a web with openings in the form of a grid or net, a perforated web or an embossed web, is roughened on one side, preferably on both sides in order to create an anchoring structure having a plurality of free fibre ends.

[0029] In one particular embodiment, the roughening of the basic structure is performed by brushing.

[0030] Moreover, the joint tape can be grooved and/or partially imprinted in the web direction.

[0031] The invention shall now be explained more closely with regard to further features and benefits by means of the description of sample embodiments and making reference to the enclosed drawings.

[0032] There are shown:

Fig. 1 a basic diagram of a joint tape according to the invention in sectional view

Fig. 2 a perspective view of a joint assembly, in which a joint tape according to the invention is worked in or can be worked in.

Fig. 3 an experimental layout for determining the adhesion of the joint tape [0033] Fig. 1 shows a joint tape 11 in a basic diagram in a longitudinal section. The joint tape 11 has a central basic structure 15, which holds the joint tape together and which can be a coherent, continuous or perforated structure, specifically a closed continuous web or a web with openings, such as a grid, a net, a perforated web or embossed web. In particular, the basic structure 15 can also have a centre longitudinally extending embossing in the form of a grooving in order to define a predetermined bending point, so that the joint tape can be easily bent at the centre by the user at the construction site, in order to ensure an improved use even in corner areas.

[0034] On either side of the basic structure 15 in the present embodiment there is provided an anchoring structure 16, while in one alternative embodiment the anchoring structure 16 could also be provided only on one side of the joint tape 11. The anchoring structure 16 comprises a plurality of fibres 17, whose proximal ends are anchored in the basic structure 15 and whose distal ends facing away from the basic structure 15 form free fibre ends 14. The free fibre ends 14 serve to anchor the joint tape even better in both the wet filler and the dried state of the filler.

[0035] In one specifically preferred embodiment, the anchoring structure is created by the roughening of a basic material, so that projecting free fibre ends 14 form the anchoring structure 16 and the remaining basic material ensures the cohesion as the basic structure.

[0036] The relatively high tensile strengths of the joint tape in the wet state as compared to the tensile strengths of the joint tape in the dry state have the effect that the joint tape lies flat in the filler and forms practically no waviness. The providing of the free fibre ends accomplishes a good adhesion of the joint tape in the filler.

[0037] In a first sample embodiment, a joint tape was selected having tensile strength of the web, for a material strip of 15 mm width, longitudinally to the main fibre direction in the dry state of > 70 N/15 mm, i.e. > 4.66 N/mm, in the wet state of > 25 N/15 mm, i.e. > 1.66 N/mm, and transversely to the main fibre direction in the dry state of > 42 N/15 mm, i.e. > 2.8 N/mm, and in the wet state of > 15 N/15 mm, i.e. > 1 N/mm.

[0038] The adhesion of the web on 1000 g/m2 of filler (dry mass) or an application around 2 mm thick after complete drying of the filler with a 90° pull-off was more than 0.8 kg for a 50 mm wide joint tape, using Uniflott ® from Knauf Gips KG as the filler, and in an experimental layout as described below for Fig. 3.

[0039] In this first example, a web of 100 pm thickness and 80 g/m2 weight per unit area was used, having a density of five projecting fibres /mm2, each having a length between 0.4 mm and 5 mm.

[0040] In a second sample embodiment, the joint tape had a thickness of 150 pm and a weight per unit area of 100 g/m2 with a fibre density and fibre length of the projecting fibres corresponding to the aforementioned first example.

[0041] Tensile strengths of the joint tape here with a material strip of 15 mm width longitudinally to the main fibre direction in the dry state were > 100 N/15 mm, i.e. > 6.66 N/mm, in the wet state > 50 N/15 mm, i.e. > 3.33 N/mm, and transversely to the main fibre direction in the dry state they were > 50 N/15 mm, i.e. > 3.33 N/mm, and in the wet state > 20 N/15 mm, i.e. > 1.33 N/mm.

[0042] An adhesion of the web on 1000 g/m2 of filler (dry mass) or an application around 2 mm thick after complete drying of the filler with a 90° pull-off of more than 1.1 kg was achieved for a 50 mm wide joint tape, using Uniflott ® from Knauf Gips KG as the filler, and in an experimental layout as described below for Fig. 3.

[0043] With the help of the experiments performed, it was also possible to prove the especially good adhesiveness of the joint tape according to the invention.

[0044] Fig. 2 shows a typical application possibility of the joint tape according to the invention. Two abutting building panels 18, 19, which can be formed here specifically as plaster boards, form a joint 12 which is at first essentially filled in with filler 13. Next, the joint tape 11 of the invention for reinforcement of the filler 13 is pressed thereupon in the wet state of the filler 13 and smoothed out with a cover layer 20 either of the same filler or preferably of another special cover filler.

[0045] Fig. 3 shows the test method used in the present invention to determine the adhesion of the joint strip.

[0046] The filler being tested is applied around 2 mm thick on a piece of gypsum board (20x40 cm) and the joint tape is inserted. This should project by around 20 cm beyond the test piece at its end. The joint tape is pressed firmly into the filler with a spatula or trowel and excess material is removed. Immediately thereafter, the joint tape is thinly covered over for 10 cm width. After the hardening and drying of the filler, the test piece is overturned and thus relieved of stress, so that the joint tape can be freely removed by pulling downward. A bucket is attached to the projecting end of the joint tape. This bucket is now filled with water so that in 30 seconds around 500 ml fills up. The joint tape proposed here can withstand at least 1000 g, especially 2000 g or more without being pulled off in a continuous motion.

[0047] With the joint tape according to the invention, the filling of joints between building panels or precast concrete parts is significantly easier. Furthermore, an even better bonding is achieved between joint tape and filler in the dry state of the filler, ensuring crack security, i.e., preventing subsequent crack formation.

List of reference symbols [0048] 11 Joint tape 12 Joint 13 Filler 14 Fibre ends 15 Basic structure 16 Anchoring structure 17 Fibres 18, 19 Building panel 20 Cover layer

Claims

A grout for reinforcing filler, wherein the groove (11) comprises a continuous, continuous or apertured base structure (15), and wherein the groove (11) for connection to the filler has an anchoring structure (16) on at least one side, preferably both sides, formed by a plurality of free fiber ends (14) projecting from the surface of the base structure for improved connection with the filler, characterized in that the tensile strength of the joint tape along as well as across the fiber main direction in the wet state is at least 30%, preferably at least 35%, of the corresponding tensile strengths in the dry state.

Joint tape according to Claim 1, characterized in that per mm 2 is provided at least 5, preferably 8, more preferably 10 fibers with a free fiber end of at least 0.4 mm in length.

Joint tape according to Claim 1 or 2, characterized in that the total length of the fibers (17) which make up the anchoring structure (16) is between 0.4 and 5 mm.

Grouting tape according to one of the preceding claims, characterized in that the basic structure (15) of the sealing tape (11) has a thickness of less than 350 μm and / or more than 100 μm.

Joint tape according to one of the preceding claims, characterized in that the fibers (17) forming the fiber ends (14) have a thickness of between 0.01 mm and 0.1 mm.

Sealing tape according to one of the preceding claims, characterized in that the sealing tape has a weight per unit area of at least 80 g / m2, preferably of at least 100 g / m2.

Sealing tape according to one of the preceding claims, characterized in that at a width of 50 mm, the adhesion of the sealing tape (11) to the filler is applied when applying a thickness of approx. 1000 g / m2 or in a thickness of approx. 2 mm, at least 0.6 kg, preferably at least 0.8 kg, further preferably 1.0 kg, at 90s peeling after complete drying of the filler.

Sealing tape according to one of the preceding claims, characterized in that the tensile strength of the sealing tape on the width of the sealing tape normalized along the fiber main direction in the dry state is above 4.66 N / mm, preferably above 6.66 N / mm.

Sealing tape according to one of the preceding claims, characterized in that the tensile strength of the sealing tape on the width of the sealing tape normalized along the fiber main direction in the wet state is above 1.66 N / mm, preferably above 3.33 N / mm.

Grouting tape according to one of the preceding claims, characterized in that the tensile strength of the grouting tape on the width of the grouting tape normalized across the fiber main direction in the dry state is above 2.80 N / mm, preferably above 3.33 N / mm.

Grouting tape according to one of the preceding claims, characterized in that the tensile strength of the grouting tape on the width of the grouting tape normalized across the fiber main direction in the wet state is above 1 N / mm, preferably above 1.33 N / mm.

Joint tape according to one of the preceding claims, characterized in that the base structure (15) and the anchoring structure (16) are formed from the same material (s) or component (s).

Joint tape according to one of the preceding claims, characterized in that the anchoring structure (16) is produced by making it rough, in particular by brushing the base structure (15).

Joint tape according to one of the preceding claims, characterized in that the anchoring structure (16) is created by applying fibers (17) with free fiber ends (14) to the base structure, wherein the base structure (15) and the anchoring structure (16) can in this respect formed from the same material (s) or component (s) or from different materials or components.

Joint tape according to one of the preceding claims, characterized in that the joint tape (11), but at least the basic structure (15), is made of a fibrous system of fibers of a uniform material or as a mixture of different materials, e.g. . also of a fiber mixture of organic and inorganic fibers.

Joint tape according to one of the preceding claims, characterized in that the base structure is in the form of a closed, continuous web (eg paper, cardboard, non-woven or woven material) or a web with openings, e.g. in the form of open nonwoven fabric, open woven fabric, lattice, mesh, perforated web or embossed web.

Joint tape according to one of the preceding claims, characterized in that the base structure (15) is provided with embossing, in particular grooves, and / or with a fully flattened or partial coating and / or with a complete or partial printing.

Joint assembly comprising two abutting building boards (18, 19) formed in particular as gypsum boards, gypsum board boards, gypsum boards with fiberglass woven cover layers, gypsum fiber boards, cement-bonded thin-walled boards or calcium silicate boards, or two abutting concrete elements (in which a concrete element 12 ), which is filled with filler (13), is given between the building boards (18, 19) or the cast concrete elements, the filler being reinforced with at least one joint strip (11) according to any one of claims 1 to 17.

A method of manufacturing a grout for reinforcing fillers, wherein a base structure (15), which is in particular in the form of a closed, continuous web of paper, cardboard, nonwoven or woven material, or a web of openings in the form of an open non-woven material, open woven material, lattice or net, is roughened on one side, preferably on both sides, to create an anchoring structure (16) with a plurality of free fiber ends (14), characterized in that in order to aim for a flat application of the joint tape in the filler, the tensile strength of the joint tape both along and across the fiber main direction in the wet state is at least 30%, preferably at least 35% of the respective tensile strengths in the dry state.

Method according to claim 19, characterized in that the base structure (15) is roughened by brushing.

Method according to Claim 19, characterized in that the joint tape thus produced is provided with grooves and / or partially with pressure in the web direction.