JP2001132180A - Built-up roofing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a conventional built-up roofing material rarely has moisture permeability and cannot cope with the recent architectural technique required for high airtightness and high heat insulation although it is excellent in waterproofness, water stop property of nail holes, and slide- proofness and a problem that a material used for a wall substrate material in the past has many practical troubles, e.g. it is very slippery, it has insufficient strength, it is more prone to cause a water leak when bored with a nail hole. SOLUTION: At least two kinds of nonwoven fabrics are integrated to form a multi-structural body. The nonwoven fabric on the upper first layer has slide- proofness, and the nonwoven fabric on the lower first layer is a hydrophobic melt blow nonwoven fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a roofing material.

[0002]

2. Description of the Related Art Roof base materials include a wooden base plate and water-resistant plywood (veneer and control panel) for a wooden house, and a sloped base material for a steel structure or a concrete structure (RC structure).
Hard wood chip cement boards, special fiber-mixed perlite cement boards, ALC boards, and the like are employed.

[0003] In general, a member called a roofing material is further placed on the roof base material, and a roof is constructed by arranging a roofing material (such as a tile or a board). The roof underlaying material is often fixed to the roof base material with nails, tackers, staples, or the like, because it is sometimes placed on a slope.

[0004] As a material for a roof underlay, a waterproof paper or a synthetic resin sheet such as a vinyl chloride resin type or a polyester resin type is sometimes used, but in many cases, asphalt roofing or asphalt felt is used. "Asphalt roofing" impregnates asphalt into base paper or web made of recycled paper, synthetic fiber, glass fiber, etc., and "asphalt felt" impregnates nonwoven fabric with asphalt. Has an asphalt layer formed thereon.

[0005] Due to the presence of asphalt, these roofing and underlining materials maintain complete waterproofness for a long period of time. Even if a nail is driven from above, water leakage from the surroundings is unlikely to occur. Since it does not slip on the base material and does not slip easily even when walking on it, the safety is high and the work efficiency is good at the time of the installation work itself or at the time of the installation work of the roofing (tiles, boards, etc.) thereafter. And so on.

[0006]

On the other hand, the Japanese-style wooden house, which was previously open and energy-consuming, was fundamentally reviewed and moved to be highly airtight and highly insulated. As for the form of ventilation, the movement of natural ventilation has recently become remarkable.

[0007] However, although asphalt has the above-mentioned effects, if it is adopted under the condition of high airtightness and high heat insulation, since the gas permeability is not so good at all, the discharge of gaseous moisture in the house does not remain. The interior of the room is uncomfortable with high humidity. In addition, since dew condensation easily occurs, there is a problem of hygiene and a problem of house corrosion.

Various measures have been devised in order to avoid these problems. For example, the wall base material disposed on the side of a house is required to have not only waterproof and heat insulating properties but also moisture permeability, and a certain effect is obtained. Are listed. For example, "TYVEK" (manufactured by DuPont, USA) is widely used as a suitable wall base material having sufficient moisture permeability and high water pressure resistance. In this method, polyethylene is dissolved in a solvent under a high pressure and a high temperature, and the fine fibers of about 0.01 denier obtained by squirting into the air are temporarily made into a felt shape, and then the felt material is hot-pressed. It was made into a nonwoven fabric.
The fibers are continuous fibers and reticulated. Further, since the fibers are very thin, the pore size of the nonwoven fabric is extremely small, and since the raw material is polyethylene and has water repellency, the product has a sufficiently high water pressure resistance and sufficient moisture permeability. Alternatively, “TOUGHSHEET” (manufactured by Mitsui Chemicals, Inc.) is also used as a sheet having moisture permeability and waterproofness. This is obtained by laminating a polypropylene orthogonal nonwoven fabric on a plastic film provided with waterproofness and moisture permeability by forming minute holes.

However, in the case of the above-mentioned "Tyvek", although excellent in terms of moisture permeability, since the felt-like material is pressed strongly and at a high temperature, the fibers are firmly bonded and the surface is very smooth. It is. Therefore, placing this on an inclined surface and walking on it is easy to slip and dangerous,
When a nail is driven in, a gap is formed between the nonwoven fabric and the nail and water leaks. In the case of the above-mentioned "tough sheet", since the film portion is very weak, the film portion is easily broken by abrasion caused by walking or slight displacement when receiving a load. That is, although these are suitable as wall base materials, they cannot be adopted as “roof underlaying materials”. Therefore, in practice, measures are taken to prevent moisture permeation on the side surfaces such as walls, but for the roof, the same underlaying material (that is, asphalt-containing product) as in the past had to be used. However, the level of airtightness of houses has been further improved with the progress of technology, and now it is not possible to prevent dew condensation if only the sides of the house such as walls have moisture permeability. The appearance was awaited.

[0010]

In view of the above points, the present inventor has finally completed the present invention as a result of diligent research. The feature of the present invention is that at least two kinds of nonwoven fabrics are integrated. In the multilayer structure, the nonwoven fabric of the upper first layer has slip resistance, and the nonwoven fabric disposed on the lower first layer is a hydrophobic meltblown nonwoven fabric.

The term "melt-blown non-woven fabric" refers to a non-woven fabric made of ultrafine fibers obtained by drawing fibrous plastic coming out of a small spinneret with high-speed hot air. Since the drawing is performed by hot air while the plastic is in a molten state, the wire diameter is very small, but the strength is not obtained because the drawing is not sufficient, and the plastic is cut in places. Since it is not of sufficient strength, the degree of pressing applied to the felt-like material is very light (when pressed strongly as in the above "Tyvek", it becomes fragile paper-like properties and can be used. Intolerable). Therefore, the melt blown nonwoven fabric has a felt shape in which the yarn is not embossed, and is easily fluffed. The melt-blown nonwoven fabric employed in the present invention is a so-called "hydrophobic plastic" such as polypropylene, polyester, or polyethylene. For example, a hydrophilic plastic such as rayon is not preferred. Even if it is hydrophobic, it does not directly affect the waterproofing ability (water pressure resistance) of the nonwoven fabric. This is because as the diameter of the yarn increases, the yarn becomes more porous and the water pressure resistance decreases.

Conventionally, melt-blown non-woven fabrics have been used in place of cotton and feathers as a heat insulating material for packing winterization clothes, but have low tensile strength and have never been used as a building material. Therefore, when this is used as a roof underlaying material,
This does not slip on the roof itself (it is presumed that the sheet is in close contact with the roof base material because the ultrafine fibers are in a felt shape), or the water stoppage is maintained even if nails are driven in (It is supposed that the fine fibers that are not fixed adhere to the nails that are driven in.)
The effect was not known at all.

According to the present invention, in order to discover such an effect and to overcome the weak point of "low strength", it is best to join a different kind of nonwoven fabric to form a multilayer structure. It has been found that this can be an ideal roofing material. In addition, "multi-layer"
Means that two or more layers are integrated, but in the case of three or more layers, the members arranged in the intermediate layer (layers not located on both sides) are limited to nonwoven fabrics Shall not. Therefore, for example, a case where a metal or plastic net is arranged for the purpose of improving the strength is also included in the roof underlaying material of the present invention.

The melt-blown nonwoven fabric exerts its effects (slip prevention effect, nail hole water blocking effect, etc.) by being adhered to the surface in contact with the roof base material when installed on the roof base material. That is, it is provided on the lowermost layer of the multilayer structure, and this layer portion is referred to as “lower first layer”.

Among the properties required for the roofing material, the melt-blown non-woven fabric is responsible for "slip resistance" and "watertightness of nail holes", and the non-woven fabric above the lower second layer is responsible for "maintaining strength". However, the non-woven fabric of the uppermost layer (hereinafter, referred to as “upper first layer”) has anti-slip properties, thereby making it difficult to slip on the roofing material of the present invention. Regarding “waterproofness”, it is not limited here which layer of the nonwoven fabric is responsible. Of course, since the most necessary physical property of the roofing material is waterproof, not only one of the two or three or more nonwoven fabric layers constituting the roofing material is provided with waterproofness, but two or more nonwoven fabric layers are waterproof. There is no problem even if it has the property.

However, within the scope of various experiments performed by the present inventors,
Non-woven fabrics other than the melt-blown non-woven fabric having a waterproof property had higher slip resistance than those obtained by processing the melt-blown non-woven fabric itself to have a waterproof property. That is, it is most preferable to adopt a “waterproof nonwoven fabric” for the nonwoven fabric above the lower second layer (for example, the upper first layer).

The waterproof non-woven fabric is a non-woven fabric having a waterproof property in a literal sense, and specific examples include a normal non-woven fabric of 40 to 100 g / m ² made of polyester or polypropylene, acrylic resin or polyurethane resin. Those which have been coated or dipped to impart waterproofness, etc., correspond thereto.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings.

FIG. 1 shows an example of a roof underlaying material 1 according to the present invention (hereinafter referred to as the present invention underlaying material 1). Is a composite non-woven fabric obtained by unifying with a bonding agent 4.

In this embodiment, the melt-blown nonwoven fabric 2 has a thickness of 100 g / m ² and the waterproof non-woven fabric 3 has a thickness of 80 g / m ^2.
m ² , and these were bonded by hot melt to obtain about 190 g / m ² of the underlaying material 1 of the present invention. There is no particular limitation on the adhesive to be used or the bonding method, but it is necessary to devise such a method that the adhesive layer does not impair the moisture permeability or the strength of the roofing material 1 of the present invention.

FIG. 2 shows a state in which the roof underlaying material 1 of the present invention is actually installed on a base plate 5 (roof base material). Normally, the roof underlaying material 1 of the present invention is placed from the eaves side of the roof, and is installed by hitting the nails 6 and arranging it appropriately. The nail 6 pierces the melt-blown non-woven fabric 2 and the waterproof non-woven fabric 3 as is apparent from the figure.
Has been reached. However, since the melt-blown nonwoven fabric 2 is not subjected to a strong press, there is no fragile portion, and no breakage such as a gap between the nail and the nail occurs.
Further, since the whole is formed of ultrafine fibers, adhesion to the nail is maintained, no water leakage occurs, and high water pressure resistance is maintained.

[0022]

As described in detail above, the roof underlaying material according to the present invention is a multilayer structure formed by integrating at least two types of nonwoven fabrics, and the nonwoven fabric of the upper first layer has slip resistance. And, the non-woven fabric disposed on the lower first layer is characterized by being a hydrophobic melt-blown non-woven fabric, and has the same waterproofness as conventional asphalt-containing type roof underlaying materials, waterproofing of nail holes, It has anti-slip properties and durability, and also has moisture permeability that was not available in conventional asphalt-containing roofing materials, and because it is lightweight, storage and transportation costs can be reduced and workability is improved. Since it becomes favorable, it is extremely useful as a roofing and roofing material for recent houses where high airtightness and high heat insulation are being pursued.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a roof underlaying material according to the present invention.

FIG. 2 is a schematic cross-sectional view showing an example of a use state of a roofing material according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roof underlay material concerning this invention 2 Melt blown nonwoven fabric 3 Waterproof nonwoven fabric 4 Adhesive 5 Field board 6 Nail

Claims (2)

[Claims] 1. A multilayer structure formed by integrating at least two types of nonwoven fabrics, wherein the nonwoven fabric of the upper first layer has slip resistance, and the nonwoven fabric of the lower first layer is hydrophobic. Underlay material characterized by being a melt-blown nonwoven fabric. 2. The underlaying material according to claim 1, wherein the nonwoven fabric disposed on the upper first layer is a moisture-permeable waterproof nonwoven fabric coated or dipped with a resin.