FI60590B - RELEASE LEVEL FAMILY FRAME RELEASE FRAME - Google Patents

Description

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Norway-Norway (NO) 761899 Proven-Styrkt (71) Isola Fabrikker A / S, N-3920 Eidanger, Norway-Norway (NO) (72) Eyvind Martin Thiis-Evensen, Eidanger, Norway-NO (7) ) The present invention relates to an improved cover of the quality indicated in the preamble of claim 1 and to a method for its production. Berggren Oy Ab (5 * +) Coating element and method for its production The shape of such roofing elements can be different so that they form a pleasant pattern when in place, for example when placed on a roof.

Usually, both the upper and lower surfaces of such roofing elements have a weight- and heat-sensitive adhesive, for example a sticky asphalt mixture. This adhesive is applied to the elements in such a way that when they are arranged in an agreed manner, i.e. so that the desired pattern is formed, an adhesive connection is established between the element layer below and the second layer placed thereon.

To prevent undesired adhesion of the roofing elements, below them there is a film, for example a polyethylene film, which is glued together by means of the asphalt on which the cardboard is impregnated or coated. When such roofing elements are stacked on top of one another or wound on a roll, the polyethylene film below the overlying element is brought into contact with the upper surface of the underlying element, which on top has an adhesive asphalt mixture or similar weight and heat sensitive adhesive mixture. If the adhesion of the binder mixture applied to the top surface of the element is not too high, then the polyethylene film acts like a release agent, so that the elements can be detached from each other relatively easily.

Due to the fact that the upper surface of the building elements has been forced to use an adhesive mixture with limited adhesion, it has in the past been forced to take advantage of the adhesion of film-covered asphalt, as this asphalt adheres to the substrate and promotes a certain adhesion between the substrate and roofing elements. As a result, it has been necessary to remove the polyethylene film before placing the elements on the substrate. This is a time consuming job that increases the cost of the roofing process, and the removed films must be assembled and disposed of to avoid contamination problems.

Although the polyethylene film is known as a removable film in the above use, the polyethylene film does not work satisfactorily in cases where more sticky binder mixtures are used. It would therefore be difficult to separate the individual cover elements from the stack if a binder mixture that is more tacky than those conventionally used for such purposes is used.

Somewhat surprisingly, it has been found that it is possible to use a substantially more tacky binder mixture if at least one side of the polyethylene film has been brushed with a release agent, for example a silicone mixture. It is known to treat the surface of a polyethylene film which must be joined to paper or some other substrate to increase its adhesion between the substrate and the polyethylene film placed thereon. Such a surface treatment usually involves a gentle surface oxidation or heat treatment of the film. Such treatment can be carried out, for example, chemically by the corona or flame method.

To make the polyethylene film more suitable for printing purposes, for example for printing some text or the like, the top surface of the film is usually treated to improve the receptivity of the printing ink of the film and to ensure better adhesion of the printing ink to the polyethylene. Such treatment of polyethylene to improve printability takes place in a manner similar to the application of polyethylene to a substrate. However, the use of a release agent-treated polyethylene film has not been previously known, such as the use of a silicone composition in connection with coating elements in accordance with the present invention.

The roofing elements according to the invention and the method for their production are characterized by what is stated in the appended claims.

The invention will now be described with reference to the accompanying drawings, which show a preferred embodiment of the invention.

Figure I shows the roof element seen from above, Figure II shows the roof element seen from below, Figure III shows in perspective two superimposed roof elements, and Figure IV shows how two such building elements are located on a roof, for example.

Figure I shows a roofing element comprising a roofing felt, fiberglass or raw felt impregnated and coated with asphalt and further sprinkled with, for example, slate sand. The black areas on the top surface represent a weight and / or heat sensitive adhesive.

Figure II shows the underside of the same roof element, the asphalt outer surface of which is covered with a polyethylene film, the outer free upper surface of which is coated with a release agent. The asphalt pavement of the protruding strips is covered with a sprinkler.

Figure III shows two overlapping cover elements, these are located in one deck, while the top cover element is shown partially raised. It can be seen from the figure how the film treated with the release agent of the top cover element communicates with the adhesive surfaces of the element below.

Figure IV shows two conventionally stepped cover elements so that the desired pattern is formed and so that the sprinkled strips of the upper cover element come into contact with the adhesive surfaces of the underlying element and thus form a tightly adhesive joint between the two elements.

The film placed on the lower surface of the cover element is preferably an LD polyethylene film having a thickness in the range of 0.025 to 0.065 ram, and at least 4,60590 the other side of which is covered with a cured silicone resin. The silicone resin can be applied to the polyethylene film in a conventional manner, for example, in the form of a resin solution dissolved in an organic solvent, after which the solvent is evaporated and the silicone resin is cured in a known manner.

Surprisingly, it has been found that it is not necessary to remove the polyethylene film from the roofing elements when these are installed according to the instructions, for example on a roof. As a result, according to the invention, a more sticky binder can be used on the upper surface of the cover elements, and therefore a stronger adhesion is created between the element below and the element placed on it, as indicated in Fig. IV.

It is necessary to remove the polyethylene film from conventional roofing elements in order to take advantage of the adhesion of the asphalt covering the roofing element, as this asphalt is exposed to the substrate and thus promotes a certain adhesion between the base of the elements.

When installing the cover elements according to the invention, it is not necessary to remove the protective film, whereby substantial savings are achieved.

When installing conventional cover elements, one third of the total working time is spent on removing the protective film from below the cover elements.

It has been found that the above-mentioned building elements can be further improved, which is of great practical importance when the roofing elements have to cover the roof in high winds.

As any expert will know, it will take some time before the asphalt mix commonly used in the types of roofing elements in question forms a strong adhesive connection between two overlapping building elements. The time required to form a strong adhesive joint depends primarily on the temperature, the adhesive mixture, etc.

In unfavorable cases, depending on the temperature, it may take several days before a strong joint is formed. Therefore, in climate-stressed areas, parts of building elements placed in place may be left fluttering in the wind, which may be very unfortunate, especially if the core of the elements is based on inorganic fibers such as glass, stone wool or the like. Such mineral fiber-based roofing elements usually have a substantially longer lifespan than those based on organic fibers, but if they are subjected to the "bending" described above, this can cause a considerable deterioration of the mineral fiber-based core of the roofing element.

It has been found that the above-mentioned disadvantages can be eliminated if the adhesive strips placed on the upper surface of the elements comprise at least a part with a strong and strongly "fixing" binder. The term adhesive in the following does not mean curing or solidification, but the fact that the adhesive almost immediately forms an adhesive bond with the substrate.

One skilled in the art will recognize that, for example, the adhesion of an asphalt mix can be varied within wide limits by the addition of various excipients, as will be reported later.

Since the use of a release liner-coated plastic film allows the use of substantially more tacky adhesive compositions in the adhesive regions of the top surface of the elements, the adhesive regions may comprise at least two different adhesive compositions with different adhesion rates. In practice, this can be done in several different ways, for example in such a way that the areas 1 and 3 of Figure 1 consist of a very fast-setting adhesive mixture, while the composition of the areas 2 and 4 can be more conventional. The same effect is obtained differently by applying a limited amount of fast-setting adhesive to the adhesive areas 1, 2, 3 and 4, for example so that the lowest narrow part of the adhesive area is formed by the fast-fixing adhesive mixture, while the more conventional adhesive mixture forms the rest. There are several reasons why the adhesive areas or adhesive zones consist only of a fast-setting adhesive, firstly an adhesive mixture, for example a modified asphalt mixture, is more expensive than a more conventional mixture (conventional mixture also means a relatively tacky mixture used in In addition, if all the adhesive strips consisted of a completely fast-setting adhesive mixture, this would cause certain difficulties when installing building elements, for example if installed incorrectly, large fast-fixing adhesive surfaces could easily make possible adjustment difficult or delay it.

6 60590 In practice, it would therefore be desirable to use as little of this fast-setting adhesive as possible, i.e. in an amount sufficient to prevent the cover elements from fluttering or moving in the wind while ensuring contact between the cover element above and part of its adhesive surface (s). , which is formed by a slower fixing adhesive mixture, so that a holding connection is formed faster between two overlapping elements than would have been possible if these elements had moved relative to each other.

The invention is therefore particularly advantageous when the roofing elements in question have to be used in a country such as Norway, which has a long coastline and is climatically stressful, where it has sometimes been difficult to install such conventional roofing elements in strong wind conditions.

By installing the cover elements without removing the film in advance, not only the reduction of the working time is achieved, but also the additional advantage, namely that the film acts as a kind of sliding surface between the underlying ribs. It is a known phenomenon that when the rafters "pass" as a result of air humidity fluctuations, bends and irregularities easily form in the roof elements because the relative movement between the substrate and the conventional roof elements is prevented because these conventional roof elements are adhered to the substrate. because the diaphragms, which are otherwise covered with sticky underside of the element is removed prior to installation. The building elements in question allow, since the film is installed together with the element, relative movement between the roof elements and the substrate so that the tendency to bend is substantially reduced.

The installation of the cover elements according to the invention is thus substantially more reasonable and simpler than the previously known cover elements.

The adhesive can be formed by: 1. Asphalt with a softening point> 75 ° C and an absorption> 30. or preferably: 2. Black asphalt with a low softening point and high absorption, thermally stabilized with atactic PP, to which softening, adhesion and possibly flexibility enhancers have been added.

Claims (2)

7 60590 Examples: a) asphalt. Atactic PP. Polybutylene. b) asphalt. Atactist PP. Polybutylene. Escorez resin. c) asphalt. Atactic PP. Polyisobutylene. Coumarone resin. d) asphalt. EPDM rubber. Polybutylene. 1. Beläggningselement i huvudsak för tak, vilket element är i form av ett enkelt element eller en rulla ocnnenefattar takfilt, som är mättad eller belagd med asfalt, glasfiber- eller non-woven filt, som har pä sin sina sida account exempel skifferströ samt ända-emléksenligt belägna limremsor, varvid en del av beläggningens undre sida är täckt med asfalt med en plastfilm, account exempel en polyole-finfilm placerad därpä, kännetecknat av att den fria sidan av plastfilmen är bestruken med et lösningsmedel och att limremsor limämnen med olika förbind-ningshastigheter. A roofing element, mainly for roofs, in the form of a simple element or a roll, comprising asphalt-impregnated and coated roofing felt, fiberglass or raw felt with on one side, for example, slate-visor and appropriately placed adhesive strips, and part of the underlayment , on which a plastic film, for example a polyolefin film, is placed, characterized in that a release agent is applied to the free side of the plastic film and in that the adhesive strips have at least two adhesives with different fastening rates. A method of manufacturing a roofing element according to claim 1, characterized in that a plastic film is applied to the lower surface of the element, the free side of which is brushed with a release agent, and adhesive strips are formed on the upper surface of the element, consisting of at least two adhesives with different adhesion rates. 2. An application for the incorporation of an adhesive element according to claim 1, the transfer of an image of a plastic film to a film, the composition of the film being a film and a limiting of the image of the element, bestär ätminstone tvä limämnen med olika förbindningshastigheter.