MXPA99011265A - Improved waterproofing membrane having release sheet cuttingsystem - Google Patents

Abstract

An improved waterproofing membrane comprising a preformed waterproofing adhesive layer, releasable sheet liner, and a string or plurality of strings operative to cut the release sheet liner into smaller portions for selective removal to expose portions of the adhesive layer for installation onto a building surface or civil engineering surface.

Description

WATERPROOFING MEMBRANE, IMPROVED, WITH CUTTING SYSTEM OF THE REMOVABLE LEAF Field of the invention The present invention relates to a preformed sheet-like waterproofing membrane laminate having a release liner sheet that can be cut using one or more tapes contained and / or embedded within the laminated structure of the membrane.

BACKGROUND OF THE INVENTION It is known in the waterproofing art to combine a preformed waterproofing membrane, such as a rubberized asphaltic bitumen layer, with a layer of support material. The layer of support material may consist of a variety of materials, such as rubber, plastic and / or metal. It has also been desirable to employ cross-laminated plastic films, such as high density polyethylene or felts or non-woven sheets as a support material to improve the stability of the membrane. These preformed waterproof membrane laminates are considered "leaf-like" because they are sufficiently flexible that they can be rolled and transported after manufacture to the work site where they are unwound and installed on the surface under construction. Although these waterproofing membranes provide considerable improvement in handling and installation when compared to the hot-applied waterproofing of decades ago, the membranes provide some challenges in that they are often sold in three-foot-wide cuts that sometimes make difficult the application. This difficulty is due in large part to the tension of the waterproofing adhesive. The preformed adhesive layer of the waterproofing membranes is usually protected by a release liner sheet, made of waxed paper or plastic, which can be detached from the adhesive at the time of application. In waterproofing techniques it is known to use split or perforated release sheets. For example, in USPatent 4,172,830 to Rosenberg and Gaidis, waterproofing membranes are disclosed in which the release sheets were perforated so that they could be stripped from the adhesive layer, and the exposed portions of the adhesive could be spread over the back of the adhesive layer. an adjacent membrane installed. It was believed that this would increase the easy handling and installation of the membranes.

The use of a sheet divided by perforations is particularly useful for the application of membranes in detailed areas, such as cavities in roofs. It is also useful when the membrane is applied as a material pouring waters around windows and doors, because a portion of the membrane can be fixed in position, although the remaining portion of the membrane is covered by the peel-off sheet and can not be embed (sticking to itself) or adhere prematurely to surfaces. However, it is quite possible that in some detailed areas the use of liner with tear-off sheets may obstruct the application, since the applicator would have to handle two portions of the peel-off sheet if he or she wishes to expose the face at one time. of the adhesive layer to join the waterproofing membrane to a surface. The previously divided release sheets require the applicator to separate both divided portions at the same time during application in extended or flat areas (not detailed), and this can make control and precise placement difficult. In view of the disadvantages of the prior art, the present inventors consider that a novel removable sheet coating system for a waterproofing membrane is necessary.

Compendium of the invention Overcoming the disadvantages of the prior art, the present invention provides an improved waterproofing membrane having at least one tape for cutting a portion of the release liner at the site of the application. One of the objects of the invention is to provide a waterproofing membrane which avoids the disadvantage of previously divided release sheet liners which make it difficult to install an entirely exposed adhesive layer. Another object of the invention is to provide the ability for the applicator the ability to cut a portion of the release liner at the application site., to facilitate the application of the membrane. In preferred embodiments, more than one tape may be used so that the area of the adhesive waterproofing surface to be exposed may be controlled. Another object of the invention is to provide convenience and flexibility in the application of waterproofing membranes in detailed areas (for example, on non-planar surfaces) and also in areas around doors, windows and other discontinuous construction surfaces or other surfaces of civil engineering. .

Accordingly, an example of improved waterproofing membrane of the present invention comprises a preformed sheet-like waterproofing adhesive layer which is releasably attached to a release liner sheet, and at least one working tape, when removed from the sheet. the adhesive layer, for cutting the release liner, by means of which a portion of the cut-off, release liner can be separated from the adhesive layer. Preferably, the waterproofing adhesive layer further comprises a carrier support layer, such as a continuous polymeric film. When a continuous film is used as a carrier, the tape or tapes will be placed within the laminate of the membrane between the carrier support layer and the release liner, generally, wholly or partially embedded in the waterproofing adhesive layer. The present invention also provides a method for the installation of sheet-like waterproofing membranes and for the manufacture of such membranes.

Brief description of the drawing Figure 1 is a sectional view of an example of a waterproofing membrane of the present invention.

Detailed description of examples of modalities As shown in Figure 1, an example of improved waterproofing membrane 10 of the present invention consists of a preformed sheet-like adhesive, waterproofing layer 12 having a first main face adjacent to, or directly bonded to, a coating of release sheet 14 which is attached to the membrane 10 so that it can be released. At least one belt 16, or more a plurality of belts, placed under the release liner sheet 14, are operative, when they move away from the adhesive layer 12, to cut into glued portions the removable sheet liner for partial, selective separation if and when you want The tape 16 is preferably oriented along the length of the membrane 10, in the so-called direction of the "aguina" because this will facilitate both the manufacture and application of the membrane 10. When a number of tapes are employed 16 , these should be spaced at intervals across the width of the membrane 10 so that portions of different sizes of the release liner sheet 14 can be cut by pulling on the appropriate tape. The term "tape" as used herein is not intended to be limiting, but means and refers to thin cords, monofilaments, threads (including single or multiple threads) or cords or even wires which are operable to cut or tear the lining of release sheet when pulled in a direction away from the waterproofing adhesive layer. Preferably, the tape has a thickness which is a fraction of the thickness of the waterproofing (total) adhesive layer, but the tape can have an identical or similar thickness as long as it can still cut or tear through the release liner when it is removed. pull by hand It is assumed that the thin cord will work better because it will tear or cut the peel sheet more effectively and cleanly. An example of waterproofing membrane 10, as shown in Figure 1, preferably comprises a carrier support sheet 18, which may be attached to a main face of the adhesive layer 12 opposite to the other main face to which the coating is attached. of release sheet 14. Carrier carrier sheet 18 may also be embedded (eg, as a canvas) within adhesive layer 12. Carrier carrier sheet 18, waterproofing adhesive layer 12, and release liner sheet 14 may be compounds of materials as conventionally known in the waterproofing art. In this way, the carrier 18 can be a continuous film made of paper, polymer, metal, glass, fabric (e.g., non-woven), felt, or mixtures thereof, bonded to the adhesive layer 12 and / or embedded therein. Preferably, the carrier support 18 consists of a polyolefin polymer (eg, polyethylene or polypropylene oriented or transversely laminated). Examples of impervious adhesive layers 12 may consist of bituminous materials (eg, rubber-modified bitumen) or synthetic non-bituminous adhesive materials (eg, SIS, SEBS, butyl rubber, etc.), as is known in the art. Examples of the release liner 16 may comprise plastics film or wax paper or treated with silicone or other known materials. Examples of waterproofing membranes and methods of use and manufacture thereof are described in US Pat. No. 3,741,856 to Hurst.; U.S. Patent 3,900,102 to Hurst; U.S. Patent 4,172,830 and 4,421,623 to Rosenberg and Gaidis; U.S. Patent 4,751,122 to Basil J. May; and US Patent 861467 to Geoffrey Davis, all of which are fully incorporated herein by reference. The preformed sheet-like waterproofing membranes are commercially available for use in subsurface installations or seat layers of W. R. Grace & Co. Conn, Cambridge, Massachusetts, under the trade name BITUTHENE®. Roofing membranes are also available from Grace with the registered names ICE & WATER SHIELD® and VYCOR®. Again, it is preferred that the tape 16 be of a relatively thinner gauge than the waterproofing adhesive layer. The tape should be of sufficient strength and tenacity to pull it and cut the release liner 14 without breaking. Examples of suitable tapes are fishing line, such as 10-25 pound string, or dental string, which can optionally be coated with wax, silicone, or other friction-reducing material, to facilitate separation or detachment of the string. waterproofing adhesive 12. The tape could consist of nylon, metal, cotton, hemp, glass or other resistant material, depending on the nature of the material used in the release liner. An exemplary method of the invention for installing a waterproofing membrane 10 is to provide a membrane, as described above, and cut a portion of the release liner sheet 14 with a tape 16. A portion of the release sheet is separated, so that An un-cut portion of the release sheet 14 can be separated at a later time. In other exemplary membranes 10 of the invention, it is possible to employ a very large number of parallel belts (preferably not in contact with one another), for example located between the adhesive layer 12 and the release liner 14, to decrease the area of the surface of the adhesive layer 12 when it is exposed. One method of the invention to prepare an example of a waterproofing membrane 10 is to melt the waterproofing adhesive onto the waxed or silicone-treated surface of the release liner 14 in which the tape or tapes are placed (or attached so that they can be peeled off). such as by drops of wax, adhesive and / or strips). Another exemplary manufacturing method includes forming the waterproofing adhesive layer 12, and then embedding at least one tape in the adhesive layer 12 formed and / or placing at least one tape against the surface of the adhesive layer. In other exemplary membranes, a plurality of tapes are placed between the adhesive layer 12 and the release liner 14, while another plurality of tapes are embedded within the adhesive layer 12. As a practical matter, since the waterproofing adhesive is extremely viscous, the Tapes initially placed "between" the adhesive layer and the release liner may become partially or fully embedded in the waterproofing adhesive in any case, since the adhesive will tend to flow around the tape. The tape that is glued against the release liner may have less tendency to become entirely submerged within the adhesive layer. However, it is considered that the invention will work even if the tapes are placed away from the release liner, as if they were initially placed or located between the carrier backing sheet (if they are attached to a main face of the waterproofing adhesive layer) and the waterproofing adhesive layer. In other exemplary embodiments, a portion of tape may extend to the other side of the waterproofing membrane to facilitate fastening the tape and pull it to cut the release liner portion in portions. The tape may have a color that is different from the color of the waterproofing adhesive or the release liner coating to facilitate visual detection of the tape by the applicator. In other exemplary modalitiesThe outer face of a detachable sheet liner bonded so that it can be peeled off may contain marks or signals which suggest to the applicator the location of the cutting tape within the membrane laminate. The above exemplary embodiments are provided solely for purposes of illustration, and are not intended to limit the scope of the invention.

Claims (18)

1. CLAIMS A sheet-like waterproofing membrane comprising: a preformed waterproofing adhesive layer, a release liner sheet which is bonded to the adhesive layer so that it can be peeled off, and at least one belt which is operable, when it is pulled out of the adhesive layer, to cut the tear-off sheet.
2. The waterproofing membrane of claim 1 further comprises a carrier backing sheet.
3. The waterproofing membrane of claim 2, wherein the carrier support sheet consists of a polymer film.
4. The waterproofing membrane of claim 1, wherein the waterproofing adhesive layer consists of a rubber modified bitumen.
5. The waterproofing membrane of claim 4, wherein the release sheet consists of a release paper coated with silicone and the waterproofing adhesive layer consists of a rubber modified bitumen.
6. The waterproofing membrane of claim 1 further comprises a plurality of tapes operable to cut portions of the release liner sheet.
7. The waterproofing membrane of claim 1, wherein the membrane comprises at least two tapes running parallel to the adhesive layer.
8. The waterproofing membrane of claim 1, wherein the tape is located between the waterproofing adhesive layer and the release liner.
9. The waterproofing membrane of claim 1, wherein the tape is embedded in the waterproofing adhesive layer.
10. The waterproofing membrane of claim 1, wherein a first plurality of tapes is placed between the waterproofing adhesive layer and the release liner, and a second plurality of tapes is embedded within the waterproofing adhesive layer.
11. The waterproofing membrane of claim 1 further comprises a carrier support sheet bonded to the main face of the waterproofing membrane layer, the membrane contains at least one belt placed between the carrier support sheet and the release liner.
12. The waterproofing membrane of claim 1, wherein at least one belt comprises a material that contains hemp, cotton, nylon, glass, metal or combination thereof.
13. The waterproofing membrane of claim 12, wherein the tape further comprises a coating.
14. 14. The waterproofing membrane of claim 12 wherein the tape contains nylon.
15. 15. The waterproofing membrane of claim 14, wherein the at least one nylon tape is a monofilament coated with wax or silicone.
16. 16. The method of making a waterproofing membrane laminate consists of providing a waterproofing adhesive layer bonded to a release liner, and incorporating at least one working belt to cut the release liner when the ribbon is pulled outwardly. the waterproofing adhesive layer.
17. The method of claim 16, wherein the waterproofing adhesive layer is provided with a melt coated waterproofing adhesive material on a release liner having the at least one ribbon placed therein.
18. 18. The method of claim 17 further comprises a plurality of tapes placed on the release liner before the molten coating of the waterproofing adhesive material. A method of installing a sheet-like waterproofing membrane in a civil engineering construction or surface which consists of: providing at the application site the membrane of claim 1, and pulling the at least one tape to cut a portion of the removable sheet. The method of claim 19 comprises cutting the release sheet, separating the cut portion, and applying the adhesive layer in a detailed area on a civil engineering construction or surface.