JP6715612B2 - Joint tape and coating film waterproofing method using the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a joint tape used when using a ventilation cushioning sheet, and more specifically, it has an opening having a high-density portion and a low-density portion, and a butting portion of the ventilation cushioning sheet used for a waterproof construction method or the like. The present invention relates to a joint tape that is attached on top of.

As one of waterproofing methods for rooftops of buildings, there is a coating film waterproofing method in which a waterproof coating is applied to a base to form a waterproof layer. As the coating film waterproof construction method, there are an adhesion construction method, a ventilation cushion construction method and the like.

Among these, in the ventilation cushioning method, a layer of the ventilation cushioning sheet is formed by laying a plurality of ventilation cushioning sheets (usually, a width of 1 m and a length of 5 to 50 m) adjacent to each other on a base such as a roof of a building. Then, the waterproof paint is applied from above the layer of the breathable cushioning material sheet to form the waterproof layer.
Here, in the ventilation cushioning method, when the layers of the ventilation cushioning sheet are formed (when they are spread), the ends of a plurality of ventilation cushioning sheets that are laid adjacent to each other are butted, and a joint is provided on the butted part. It is generally practiced to bond and integrate the plurality of ventilation cushioning sheets by attaching a tape.

The ventilation cushioning sheet has a function of buffering a force applied by walking of a person, a stress caused by contraction/expansion of concrete or the like, and a function of laterally venting gas such as water vapor generated from a base or the like. Have.
For example, base concrete laid on the rooftop of a building is exposed to a drastic temperature change of about 60°C in summer and about -20°C in winter. Therefore, when the temperature rises, a large amount of gas such as water vapor contained in the concrete is released from the concrete to the outside.

As described above, since it is necessary to apply the waterproof coating on the ventilation cushioning sheet to form the waterproof layer, a layer that is difficult for liquid or gas to permeate is used as the upper surface base material of the ventilation cushioning sheet.
Therefore, the gas released from the concrete cannot pass through the ventilation cushioning sheet or the waterproof layer vertically and be released into the atmosphere from the upper surface thereof. A vent layer mainly made of a non-woven fabric or the like is provided under the upper surface substrate in order to escape in the lateral direction (for example, Patent Document 1).
Further, in the ventilation cushioning sheet, there is an adhesive layer on the lowermost surface that is adhered to the concrete base, and since the adhesive layer has no air permeability, the adhesive layer is formed only on a part of the lower surface, not on the entire surface. There is also known a ventilation cushioning sheet in which a space between a portion where an adhesive layer is not formed and a base is secured as a gas passage (for example, Patent Documents 2 and 3).

As described above, in the ventilation cushioning method, the ends of the adjacent ventilation cushioning sheets are abutted against each other, and the joint tape is attached onto the abutted portion. As a result, the ventilation cushioning sheets are prevented from being displaced from each other, or the waterproof paint or the like is prevented from entering the gap between the abutting portions of the ventilation cushioning sheets.

However, when a normal adhesive tape having a uniform base material and a uniform adhesive layer is used as the above-mentioned joint tape, the joint tape may peel off under the waterproof layer or the top coat layer with the passage of time after the waterproofing work is completed. , The "waterproof layer or topcoat layer" near the edge (edge) of the joint tape is cracked, or the thickness of the coating waterproof layer on the joint tape is thinner than other parts, resulting in strength. There was a problem saying that it was inferior to.
In order to solve such a problem, Patent Document 4 describes that the joint tape is provided on both sides with an extended portion having no adhesive layer, but the above problem cannot be completely solved. ..

On the other hand, joint tapes having various properties have been known as joint tapes for plates and reinforcement tapes for joint openings, although they are not joints for ventilation cushioning sheets.
Patent Document 5 describes a joint tape mainly having a nonwoven fabric base material and having improved strength, which is mainly used for joining plates, and Patent Document 6 discloses a base material which is an opening body made of a flat yarn. Reinforcement tape for joint openings having the above is described.

However, when the joint tape using the opening body as the base material is simply applied to join the ventilation cushioning sheets, there are the following problems.
That is, in the ventilation cushioning method, as described above, a plurality of ventilation cushioning sheets are laid adjacent to each other on the base, but at that time, in the gap between the abutting portions of the adjacent ventilation cushioning sheets, the waterproof that has passed through the opening body. In some cases, the paint entered and hindered the flow of gas between the air-drying sheets.

In such a case, extremely, unless a de-cylinder is provided for each ventilation cushioning sheet (usually about 1 m in width and about 5 to 50 m in length), the pressure of the gas released from the base is locally high. In some cases, obstacles such as local lifting (swelling) of not only the ventilation cushioning sheet but also the waterproof layer thereabove may occur. It is common to provide one or ^two de-cylinders per 100 m ² (as a rule), but if de-cylinders are provided for each one ventilation cushioning sheet, it is not profitable in terms of cost, and the rooftop Etc. may impair the appearance and safety.

In recent years, the importance of waterproofing has risen, but physical (strength) problems do not occur in the waterproof layer and top coat layer immediately above the edge (widthwise end) of the joint tape, The joint tape itself does not peel off, ensuring the flow of "gas generated from the base" between adjacent ventilation cushioning sheets so that "local rising (swelling) of the waterproof layer or topcoat layer" does not occur. There was no technology for "joint tape used for joining air-permeable cushioning sheets".

JP, 2011-057807, A JP, 2004-036324, A JP, 2010-248757, A JP, 2006-083560, A Japanese Patent Publication No. 2010-512478 JP, 2014-190152, A

The present invention has been made in view of the background art described above, and its problem is to provide a "waterproof layer or top" near the top of the joint tape, particularly near the edge (end in the width direction) of the joint tape in the ventilation cushioning method. It does not cause physical (strength) problems in the "coat layer", strengthens the adhesion (adhesion) of the joint tape to the ventilation cushioning sheet, and "gas generated from the base" between adjacent ventilation cushioning sheets. To provide a "joint tape used for joining air-permeable cushioning sheets to each other", which secures the distribution of the above and prevents "local rising (swelling) of the waterproof layer or the top coat layer" from occurring. It is to provide a waterproof coating method and a waterproof layer using a joint tape.

The present inventor has conducted extensive studies in order to solve the above problems, and as a result, uses an opening body as a base material of the joint tape, and in the substantially central portion in the width direction and both side portions in the width direction of the joint tape, The present invention has been found to be able to secure a strong fixing property of a joint tape on a ventilation cushioning sheet by a waterproof coating and a gas flowability between adjacent ventilation cushioning sheets by providing a difference in density between the openings. Was completed.

That is, the present invention is a joint tape adhered on the abutting portion of the end portions of a plurality of ventilation cushioning sheets laid on the base,
In order from the top, having an opening body having an opening portion, an adhesive layer, and a release sheet,
In the opening body, a substantially central portion in the width direction of the joint tape has a small opening ratio to form a high density portion, and both side portions in the width direction have a large opening ratio to form a low density portion.
The adhesive layer is provided so as not to seal the opening at least in the low-density portion, thereby providing a joint tape.

Further, the present invention is a method for manufacturing the above-mentioned joint tape, which is affixed on the abutting portion of the end portions of the plurality of air-permeable cushioning sheets laid on the base,
The high density portion is manufactured by reducing the opening ratio at the substantially central portion of the joint tape in the width direction, and the low density portion is manufactured by increasing the opening ratio on both sides in the width direction to form the opening body. The process of obtaining,
A step of forming a pressure-sensitive adhesive layer by directly applying a pressure-sensitive adhesive solution or a pressure-sensitive adhesive dispersion on at least one surface of the opening body so as not to seal the opening at least in the low-density portion,
And a step of laminating a release sheet on the pressure-sensitive adhesive layer, at least.

Further, the present invention, the step of laying a plurality of ventilation cushioning sheet on the base,
A step of adhering the above-mentioned joint tape on the abutting portions of the end portions of the ventilation cushioning sheet while peeling off the release sheet,
A step of applying a waterproof paint from above the joint tape to pass a large amount of paint to the low density part rather than the high density part,
The present invention provides a coating film waterproofing method characterized by having at least.

The present invention also provides a waterproof coating layer, which is obtained by using the waterproof coating method described above.

ADVANTAGE OF THE INVENTION According to the joint tape of this invention, the said problems and problems are solved, and the coating of the vicinity of just above the edge (end part in the width direction) of "the joint tape which joins adjacent ventilation cushion sheets in a ventilation cushioning method". Does not cause physical (strength) problems such as cracking in the waterproof membrane or top coat layer, and firmly adheres (joins) the joint tape itself to the ventilation cushioning sheet for a long period of time. Can be made.

In the joint tape of the present invention, an opening body is used as a base material, and the opening ratio of the opening body is large at both side portions in the width direction of the joint tape. , "Under the joint tape and above the ventilation cushioning sheet", the joint tape is firmly fixed to the ventilation cushioning sheet.

In addition, since the joint tape of the present invention uses the opening body as the base material, it is like "a normal adhesive tape that has no openings and is continuous and uniform and uses paper, cloth, resin film or the like as the base material". It is more flexible than other joint tapes and can be expanded and contracted. Hereinafter, the inside of "" may be simply referred to as "ordinary pressure-sensitive adhesive tape".
The holding concrete and the ventilation cushioning sheet thereon used in the waterproofing method of the coating film are displaced relative to each other due to temperature changes and long-term aging. Therefore, in a joint tape such as an ordinary adhesive tape, the joint tape is pulled toward the strongly fixed ventilation cushioning sheet (for example, on the right side) at the abutting portion of the ends of the ventilation cushioning sheet. If it is firmly fixed to the ventilation cushioning sheet of (1), it will be pulled toward the ventilation cushioning sheet on the right side), and it will peel off from the ventilation cushioning sheet that is weakly adhered (for example, ventilation on the left side). If it is weakly adhered to the cushioning sheet, it may peel off from the ventilation cushioning sheet on the left side).
As a result, in the vicinity of the joint tape, the "waterproof layer or the top coat layer" may be cracked or peeled.
However, since the joint tape of the present invention uses the opening body as the base material, it has flexibility and can be expanded and contracted. It follows that the "waterproof layer or top coat layer" is not cracked or peeled off near the joint tape.

Further, since the part of the opening body having a large opening ratio is taken into the waterproof coating film, the joint tape of the present invention functions as a reinforcing cloth together with the waterproof coating film. Further, the fixing property of the joint tape and the strength of the waterproof coating film can be improved.

Further, it is possible to secure the flow of "gas generated from the base" between the adjacent ventilation cushioning sheets and prevent "local uplift (bulging) of the waterproof layer or the topcoat layer" from occurring.
Normally, one ventilation cushioning sheet has a width of about 1 m and a length of about 5 to 50 m. However, if gas flows only in such a small area, it is not necessary to provide a de-cylinder for each small area. However, there are problems in terms of cost, appearance, and risk prevention.
According to the joint tape of the present invention, even though the opening body is used as the base material, the opening ratio is small above the abutting portions of the end portions of the ventilation cushioning sheet, so that the waterproof coating does not easily flow in. (It is difficult for the joint tape to pass through), and as a result, the gas flow is not blocked between the adjacent ventilation cushioning sheets. Therefore, it is only necessary to provide one or two de-cylinders per 100 m ² in accordance with the regulations, and it is possible to suitably prevent the waterproof layer and the top coat layer from rising (swelling).

In order to solve the above-mentioned problems, an opening body is adopted as the base material of the joint tape, and the waterproof paint is applied only to the substantially central portion in the width direction of the joint tape, that is, the portion above the abutting portion of the adjacent ventilation cushioning sheet. It may be possible to separately attach (provide) a "narrow adhesive tape" or the like so as not to pass through.
However, if it is attempted to provide the "narrow adhesive tape" only in the substantially central portion in the width direction of the joint tape, the number of steps will surely increase, leading to an increase in cost.

That is, in this method, an opening body provided with the adhesive layer A is obtained, and the release paper for protection of the adhesive layer A is peeled therefrom (the existence of the release paper is indispensable for movement and transportation). Then, the release paper for protection of the adhesive layer B is peeled off from the narrow adhesive tape (presence of the release paper is indispensable for moving or transporting), and the "narrow adhesive tape" is applied to the adhesive layer. Attach with B to the opening. After that, the adhesive layer C as a joint tape is provided again on the side opposite to the adhesive layer B of the adhesive tape (the side having no adhesiveness). Therefore, the number of manufacturing steps is increased by about 5 to 6 as compared with the method for manufacturing the joint tape of the present invention.

On the other hand, according to the joint tape of the present invention, the high-density portion in the substantially central portion in the width direction and the low-density portions on both side portions in the width direction can be manufactured at the same time or in a series of manufacturing steps, so that the number of steps is significantly reduced. The cost can be reduced, and problems in manufacturing hardly occur.
The high density portion and the low density portion of the joint tape of the present invention are integrated. In the present invention, "integral" refers to a state in which at least the high density portion H and the low density portion L are continuously formed of the same material.

Furthermore, by making the opening body of the joint tape of the present invention a plain weave or a leno weave, it becomes easy to weave the high density portion of the central portion and the low density portions of both side portions simultaneously or in a series of manufacturing steps. Therefore, the cost can be further reduced, and the manufacturing problem can be prevented.
Further, since the joint tape of the present invention after peeling the release sheet does not require a complicated layer structure and can be manufactured as an integrated unit, the number of layers does not increase or decrease depending on the location of the joint tape, and the number of layers is uniform (same) as a whole. Therefore, despite the simple structure, the effects of the invention described above can be obtained.

Further, by weaving using a "row of yarns in which a plurality of yarns are arranged in parallel adjacent to each other without being substantially twisted with each other", a high density portion and a low density portion are formed in the obtained opening body. In addition, the joint tape as a whole becomes flat and the rigidity decreases, so that the joint tape can be easily used.
Further, when the opening body is subjected to calendering or the like to be thinned, the opening body becomes flatter and the rigidity is reduced, and it becomes easy to use as a joint tape, and the opening ratio of the high density portion is further increased. The size of the waterproof paint decreases, the permeability of the waterproof paint deteriorates, the waterproof paint does not easily flow into the gap between the abutting cushioning sheets, and the waterproof paint does not hinder the passage of gas between the adjacent breathing shock absorbing sheets.

If the adhesive layer is provided under the opening, when the joint tape is placed on the abutting portion of the ventilation cushioning sheet, the joint tape may fly or move due to wind etc. before applying the waterproof paint. Can be prevented.
Further, if the adhesive layer is provided in the low-density portion of the opening body so as not to seal the opening, the waterproof paint may pass downward through the opening, whereby "the joint tape on the ventilation cushioning sheet It is possible to obtain the above-described effect (the effect that the joint tape does not fly or move due to the wind, etc.) while ensuring "strong adhesion".

Even if the air-permeable cushioning sheets are not firmly joined together due to the adhesiveness of the joint tape itself due to the adhesive layer, the waterproof coating layer formed by applying the waterproof paint on top of them firmly joins the air-permeable cushioning sheets together. .. Therefore, the weakness of the adhesive strength of the adhesive layer (the weakness of the adhesiveness of the joint tape itself) due to the fact that the base material of the joint tape is the opening body does not become a drawback, and therefore the opening body is Is not expressed, only the advantages of being an open body are expressed.

It is a schematic sectional drawing which shows the form of a ventilation cushioning sheet, and the coating film waterproof layer on it. (A) A schematic cross-sectional view of a ventilation cushioning sheet having a ventilation layer and a ventilation path made of a nonwoven fabric or the like (a cross-sectional view taken along the line EE' of FIG. 1(b)) (b) Ventilation layer and a ventilation path (C) Schematic cross-sectional view of a ventilation cushioning sheet having a cushioning layer and a ventilation path It is a schematic sectional drawing which shows the usage type of a joint tape. It is a schematic plan view which shows an example of the opening body of the joint tape of this invention. (A) A schematic plan view of an opening body forming material which is orthogonal to each other (a rectangular opening) (b) A schematic plan view of an opening body having a hexagonal opening It is a schematic expanded sectional view which shows an example of a high density part and a low density part of the joint tape of this invention. (A) One thread (opening body forming material) forms a high density portion and a low density portion (b) Four threads (opening body forming material) form one thread row A high-density portion and a low-density portion are formed. (c) An end view of the section cut along the line AA' in FIG. 6, in which the opening body in (b) is thinned by pressing. It is a schematic cutting part enlarged end view which shows the example of an opening body. (A) One thread (opening body forming material) forms a high-density portion and a low-density portion (b) Three threads (opening body forming material) form one thread row High density part and low density part are formed (c) (b) High density part is even higher density (d) Four yarns (opening body forming material) are one yarn row Forming a high-density portion and a low-density portion by forming a hole, and there is no opening in the high-density portion It is an enlarged plan view showing an example of an opening object which is textiles. 5 is a photograph of a high density portion and a low density portion of the joint tapes of Production Example 1 and Example 3 as viewed from diagonally above. 8 is an enlarged photograph of FIG. 7 in which the high-density portion and the low-density portion of the joint tapes of Production Example 1 and Example 3 are viewed obliquely from above.

Hereinafter, the present invention will be described, but the present invention is not limited to the following specific forms and can be arbitrarily modified within the scope of the technical idea.

1. Function/Use/Role of Joint Tape The joint tape of the present invention is the joint tape 11 attached on the abutting portions 48 of the ends of the plurality of ventilation cushioning sheets 41 laid on the base 31. ..
The ventilation cushioning sheet 41 is used in a coating film waterproofing method or the like, has a function of buffering an external force, a stress caused by contraction/expansion of the foundation concrete, and the like, and a gas such as water vapor generated from the foundation concrete or the like in the lateral direction. It has a function of aeration and prevents local blistering on the waterproof film 51.

As the ventilation cushioning sheet 41, as shown in FIGS. 1(a) and 1(b), the ventilation cushioning sheet base material 42 and the reinforcing layer 43 have "a ventilation layer 44 made of a nonwoven fabric or the like" and a "ventilation path 47". And a ventilation cushioning sheet 41 having a cushioning layer 46 and a ventilation path 47 as shown in FIG. 1C.
In the ventilation cushioning sheet 41 as shown in FIGS. 1(a) and 1(b), the ventilation layer 44 and the ventilation path 47 allow gas to escape laterally, and in the ventilation cushioning sheet 41 as shown in FIG. 1(c), The air passage 47 formed of a portion without the adhesive layer 45 such as butyl rubber allows the gas to escape in the lateral direction and prevents local blistering on the waterproof coating layer 51.
The joint tape 11 of the present invention is applicable to any type of ventilation cushioning sheet 41, including the ventilation cushioning sheet 41 of the type described above. The so-called "ventilation cushioning sheet 41" is included in the so-called "ventilation cushioning sheet 41" as long as it has breathability even if it does not have cushioning properties.

The ventilation cushioning sheet 41 usually has a width of about 1 m and a length of about 5 m to about 50 m, and is usually laid on the entire surface of a waterproof object such as a rooftop. FIG. 2 shows a schematic cross-sectional view showing a usage mode of the joint tape 11. As shown in FIG. 2, the air-permeable cushioning sheets 41 are abutted to each other at their end portions, and the joint tape 11 is adhered onto the abutted portion 48 so that the air-permeable cushioning sheets 41 are adjacent to each other by the joint tape 11. To be jointed. In FIG. 2, the butted portion 48 is shown with a slight gap, but the adjacent ventilation cushioning sheets 41 may be butted to each other.

2. Aspect of Joint Tape The joint tape 11 of the present invention has “an opening body 12 having a portion having an opening”, an adhesive layer 13, and a release sheet 14 in order from the top. FIG. 4 shows a schematic partial enlarged cross-sectional view of an example of the joint tape 11 of the present invention when the opening 12 is a plain weave.

2.1. Opening and adhesive layer (1)
In FIG. 4, the adhesive layer 13 is continuously formed only in the high-density portion H of FIG. 4C, but in other figures, the adhesive layer 13 is formed only under the opening forming material 15. There is. In the present invention, what is not formed continuously on the entire lower surface of the opening body 12 but is formed only under the opening body forming material 15 is also referred to as the adhesive layer 13.

When the adhesive layer 13 is applied to the entire surface of the joint tape of the present invention and the opening 16 disappears, waterproof paint and the like cannot pass through the joint tape 11, so that the entire surface of the opening 16 is sealed at least in the low density portion L. It is essential that it is provided so that it does not end up. In other words, it is essential that the adhesive layer 13 is provided so as not to completely seal the opening 16 at least in the low density portion L. It is preferable that the adhesive layer 13 is provided only under the opening 12 forming body.

In the joint tape of the present invention, at least in the low-density portion L, the opening 16 is present in order to exert the effects of the present invention.
On the other hand, in the high density portion H, the opening 16 may or may not exist. The presence of the openings 16 in the high-density portion can ensure a certain adhesiveness even in the "substantially central portion of the joint tape 11 in the width direction", and the absence of the openings 16 in the high-density portion H almost prevents the passage of the waterproof paint. It is completely prevented, and the flow of gas between the adjacent ventilation cushioning sheets 41 is easily secured.
In FIG. 4( a ), the adhesive layer 13 exists only under the thread 17 of the fabric forming the opening body 12, and in FIG. 4( b ), the thread 17 which is the opening body forming material 15 forms the thread row 18, The adhesive layer 13 exists only below the thread row 18. In both FIGS. 4A and 4B, the opening 16 exists on the entire surface of the joint tape.
In FIG. 4C, the low-density portion L of the opening body 12 has the adhesive layer 13 only below the thread row 18, and the high-density portion H of the opening body 12 has the adhesive layer 13 on the entire surface. In FIG. 4C, the opening 16 exists in the entire surface of only the low density portion L of the joint tape, and the opening 16 does not exist in the high density portion H.

2.2. Opening body 2.2.1. Form of Opening Body FIG. 3 shows a schematic plan view of an example of the opening body 12 of the joint tape 11 of the present invention. FIG. 3 is a schematic plan view of a substantially preferable size of a particularly preferable size.
The shape of the opening of the opening body 12 in the joint tape of the present invention is not particularly limited as long as it is configured to have a portion where the opening exists. In order to exert the above-mentioned effects of the present invention (water-permeable paint passing performance and the like), at least the opening of the low-density portion L has a pitch of openings such that the opening 16 is not blocked even when the adhesive layer 13 is applied, and The size is preferable. Further, the pitch and size of the openings are set so as to give flexibility to the joint tape of the present invention and allow expansion and contraction that can appropriately cope with the displacement of the adjacent ventilation cushioning sheets 41. preferable.

FIG. 3A is a schematic plan view of the opening body forming material 15 that is orthogonal to each other (the opening 16 is rectangular) to form the opening body 12, and FIG. 3B is a schematic plan view of the opening 16 having a hexagonal shape. It is a schematic plan view of the opening body 12 which is.
The form of the opening body 12 in the joint tape 11 of the present invention is not particularly limited, and may be a woven or knitted fabric as shown in FIG. 3(a), or may be a punched film ( FIG. 3B).
Among them, the opening body 12 is a "plain weave or leno weave" described later, which can be integrally manufactured in a series of manufacturing steps, which can flexibly cope with the deviation of the adhered surface due to its flexibility. Since it is flat, it is preferable because it can be easily attached.

In the opening body 12, a substantially central portion in the width direction of the joint tape 11 has a small opening ratio to form a high density portion H, and both side portions in the width direction have a large opening ratio to form a low density portion L. Must be done.
With such a configuration, the waterproof paint is unlikely to pass through the high density portion H and the waterproof paint is easily passed through the low density portion L. Therefore, while ensuring the gas flow between the ventilation cushioning sheets 41, By firmly fixing the ventilation cushioning sheet 41, the above-described effects of the present invention can be effectively exhibited.

That is, in the high-density portion H, liquid waterproof paint or the like is prevented from passing through the joint tape 11, and the waterproof paint or the like is unlikely to flow into the abutting portions 48 of the end portions of the ventilation cushioning sheet 41. As a result, proper ventilation is ensured between the adjacent ventilation cushioning sheets 41, and blistering or the like is less likely to occur in the waterproof coating layer 51.
On the other hand, in the low-density portion L, waterproof paint or the like passes through the joint tape 11 and reaches the upper surface (fixed surface) of the ventilation cushioning sheet 41 to improve the adhesiveness of the joint tape 11. As a result, the joint tape 11 peels off under the coating waterproof layer 51 or the top coat layer 52, or cracks occur in the "coating waterproof layer 51 or the top coat layer 52" near the edges (ends) of the joint tape 11. The problem that the waterproof film 51 on the top of the joint tape 11 becomes thinner than other parts and the strength locally deteriorates is solved.

In addition, in the form of the joint tape 11 of the present invention, as described above, a form in which a tape having a narrow width is provided so that the waterproof paint or the like which is a liquid does not pass through substantially in the center in the width direction of the joint tape 11 as described above. In comparison with the above, since it can be integrally manufactured in a series of manufacturing steps, it has a simple structure and is extremely advantageous in terms of cost in terms of the number of manufacturing steps.
In the present invention, "integrally manufactured" means that the high-density portion H and the low-density portion L are manufactured from the same material in a series of manufacturing steps.

The width of the joint tape of the present invention is not particularly limited, but is preferably 3 cm to 30 cm, more preferably 5 cm to 17 cm, and particularly preferably 7 cm to 15 cm.
If the width is too short, the low-density portion L becomes narrower, so that the amount of waterproof paint passing therethrough may decrease and the adjacent ventilation cushioning sheets 41 may not be firmly fixed to each other. The misalignment may cause the joint tape 11 to peel off and eventually cause the waterproof paint or the top coat layer 52 to crack, and the waterproof paint may flow into the "butting portion 48 between the end portions of the adjacent ventilation cushioning sheets 41". In some cases, it may be difficult to attach the joint tape 11 to the ventilation cushioning sheet 41.
On the other hand, if the width of the joint tape is too wide, it may be wasted or difficult to handle.

In the opening body 12, the “substantially central portion of the joint tape 11 in the width direction” has a small opening ratio and constitutes a high density portion H. The width of the high density portion H is not particularly limited, but is preferably 1 cm to 6 cm, more preferably 2 cm to 5 cm, and particularly preferably 3 cm to 4.5 cm.
Further, the ratio of the width of the high density portion H to the entire width of the joint tape 11 is preferably 15% to 60%, more preferably 20% to 50%, further preferably 25% to 45%, and 30% to 40%. Is particularly preferable.

If the width of the high density portion H is too short (too narrow), or if the ratio to the total width of the joint tape 11 is too small, the waterproof paint will be "abutting portion 48 between the end portions of the adjacent ventilation cushioning sheets 41". It may easily flow. In addition, when the joint tape 11 is attached, it may be difficult to deal with the blurring of the joint tape 11 in the width direction. There is no choice but to demand accuracy.
On the other hand, if the width of the high-density portion H is too long, or if the ratio to the total width of the joint tape 11 is too large, the width of the low-density portion L becomes short, so that the amount of waterproof paint passing therethrough decreases and There is a case where the ventilation cushioning sheets 41 to be fixed cannot be firmly fixed to each other, and the displacement of the adjacent ventilation cushioning sheets 41 to each other may cause peeling of the joint tape 11 and cracks in the waterproof paint or the top coat layer 52.

The high-density portions H are located substantially in the center in the width direction of the joint tape 11, and the low-density portions L are located on both sides in the width direction, but the lengths of the low-density portions L on both sides are not particularly limited. , Preferably approximately equal. The length of the low density portion L on one side is not particularly limited, but is preferably 1.5 cm to 12 cm, more preferably 2 cm to 7 cm, and particularly preferably 3 cm to 4 cm.
If the width of the low-density portion L is too short, the amount of waterproof paint that passes through may decrease, and the adjacent ventilation cushioning sheets 41 may not be firmly fixed to each other. 11 may be peeled off or the waterproof paint or the top coat layer 52 may be cracked.

The average thickness of the openings 12 is preferably 0.07 mm or more and 0.7 mm or less, more preferably 0.1 mm or more and 0.6 mm or less, and 0.15 mm or more and 0.1 mm or less for both the high density portion H and the low density portion L. 5 mm or less is particularly preferable.
If it is too thick, the flexibility may be lost, or a step may be formed at the edge of the joint tape 11 to affect the thickness of the waterproof coating film. On the other hand, if it is too thin, the strength of the joint tape 11 may not be ensured.

Further, in the “(particularly) preferable average thickness range of the joint tape 11 excluding the release sheet 14”, the average thickness of the adhesive layer 13 is sufficiently smaller than the average thickness of the opening body 12, Same as range.

2.2.2. Opening ratio The opening ratio (S1) of the high density portion H of the opening body 12 in the joint tape 11 of the present invention depends on the viscosity of the waterproof paint, but is preferably 0% or more and 70% or less, and 2% or more. It is more preferably 50% or less, further preferably 3% or more and 40% or less, and particularly preferably 5% or more and 30% or less.
The opening ratio (S2) of the low-density portion L of the opening body 12 is preferably 20% or more and 90% or less, and is 25% or more and 80% or less, although it depends on the viscosity of the waterproof coating. It is more preferably 30% or more and 70% or less, still more preferably 35% or more and 60% or less.

The ratio (S1/S2) of the aperture ratio (S1) of the high density portion H and the aperture ratio (S2) of the low density portion L is preferably 0.0 to 0.7, and 0.01 to 0.6. More preferably, 0.03 to 0.5 is further preferable, and 0.1 to 0.4 is particularly preferable.
Here, the “aperture ratio” refers to the ratio of the area occupied by the portion (opening portion) where the opening body forming material 15 does not exist to the total area of the “portion of the opening body 12 whose aperture ratio is to be measured”. ..

The reason why the upper limit of the aperture ratio of the high density portion H is larger than the lower limit of the aperture ratio of the low density portion L is as follows.
That is, the optimum point of the aperture ratio shifts in both the high-density portion H and the low-density portion L depending on the type, viscosity, structural viscosity, application method of the waterproof paint, the condition of the ventilation cushioning sheet 41 (fixed surface), and the like. is there. In the present invention, it is essential that at least two types of portions having different densities (opening ratios), that is, a high density portion H and a low density portion L, be present in one joint tape 11.

When using a low-viscosity waterproof paint or when diluting the waterproof paint, both the high density portion H and the low density portion L have a relatively small aperture ratio as compared with the case where the waterproof paint is not used. It is preferable. That is, it is preferable to shift the lower limit or the upper limit of the aperture ratio to the smaller one.
On the other hand, when a high-viscosity waterproof paint is used or when the waterproof paint is used without dilution, the opening ratio is relatively high in both the high density portion H and the low density portion L as compared with the case where the waterproof paint is not used. Is preferably large. That is, it is preferable to shift the lower and upper limits of the aperture ratio to the larger one.

If the open area ratio (S1) of the high density portion H is too large, the waterproof paint will pass through the joint tape 11 even in the substantially central portion of the joint tape 11 in the width direction and fill the butted portion 48 of the ventilation cushioning sheet 41 for ventilation. It may cut off the sex.
On the other hand, the open area ratio (S1) of the high-density portion H may be 0% (although it may not be open), but if it is too small, the waterproof paint is completely jointed in the substantially central portion of the joint tape 11 in the width direction. Since it does not pass through the tape 11, the adhesiveness may be lowered at the substantially central portion. Although the waterproof coating does not have to pass through the substantially central portion at all, it is also preferable to pass a certain amount to secure the adhesiveness of the joint tape 11.

If the open area ratio (S2) of the low-density portion L is too large, the mechanical strength of the joint tape 11 becomes too low, or the area of the adhesive layer 13 becomes too small so that the adhesiveness is reduced and a waterproof coating is applied. In some cases, the joint tape 11 may move in front or fly by the wind or the like.
On the other hand, if the open area ratio (S2) of the low-density portion L is too small, the waterproof paint is prevented from passing on both sides in the width direction of the joint tape 11, and the joint tape 11 is sufficiently fixed to the upper surface of the ventilation cushioning sheet 41. It may disappear.

If the ratio (S1/S2) of the aperture ratio (S1) of the high density portion H and the aperture ratio (S2) of the low density portion L is too small, the above-mentioned aperture ratio (S1) of the high density portion H is too small. Or, a problem may occur when the aperture ratio (S1) of the low-density portion L is too large, while if S1/S2 is too large, the aperture ratio (S1) of the high-density portion H described above becomes large. Problems may occur when the aperture ratio (S1) of the low-density portion L is too large or too small.
In the joint tape 11 of the present invention, by adjusting the opening ratio (S2) of the high-density portion H and the low-density portion L, the amount of the waterproof paint passing (passing rate) can be arbitrarily controlled.

2.2.3. Material of Opening Body and Manufacturing Method The material of the opening body 12 is not particularly limited as long as it exhibits the above effect, but polyesters such as polyethylene terephthalate and polycarbonate; (meth)acrylic resin, polyethylene, polypropylene, polystyrene, Vinyl resins such as polyvinyl chloride, polyvinyl acetate, and their copolymers; polyamides; polyurethanes; papers; knitted fabrics, woven fabrics, and non-woven fabrics obtained from fibers such as natural fibers, synthetic fibers, recycled fibers, inorganic fibers, and metal fibers; Etc.

The opening body 12 may be a “woven fabric or knitted fabric” as shown in FIG. 3( a) and FIGS. 4 to 7, and may be a “resin film, paper, woven fabric, as shown in FIG. 3( b ). It is also possible to use a "punched piece of non-woven fabric".

2.2.4. Woven fabric Since the opening body 12 in the joint tape 11 of the present invention is a plain weave fabric or a leno weave fabric, since it is flexible and expands and contracts, it is suitable for the mutual displacement of the adjacent ventilation cushioning sheets 41. It is possible; the high-density portion H and the low-density portion L can be manufactured by a series of manufacturing steps, which is advantageous in terms of manufacturing cost; as described above, the "narrow waterproof paint impermeable tape is attached to the substantially central portion. Compared with the "composite", the joint tape 11 is integrated as a whole, so the structure is simple; it can be made flat so that it can be easily attached onto the abutting portion 48 of the ventilation cushioning sheet 41 before applying the waterproof paint; After applying the coating material, it exerts a function as a reinforcing cloth for the waterproof coating film to improve the strength of the waterproof coating film;

When the opening body 12 is a woven fabric, the opening body 12 is formed of the warp yarns 17a and the weft yarns 17b, and the density of the warp yarns 17a or the weft yarns 17b in the high density portion H is 30 yarns/inch or more and 120 yarns/inch or less. Is preferred.
The warp yarns 17a or the weft yarns 17b in the low density portion L preferably have a density of 5 threads/inch or more and 45 threads/inch or less.
It is more preferable that the conditions of the high density portion H and the low density portion L are simultaneously satisfied. That is, the density of the warp yarns 17a or weft yarns 17b in the high-density portion H is 30 yarns/inch or more and 120 yarns/inch or less, and the density of the warp yarns 17a or weft yarns 17b in the low density portion L is 5 yarns/inch or more. It is more preferable that the number is 45 lines/inch or less.
Within the above range, it is easy to exhibit the above-mentioned characteristics such as the permeability of the waterproof coating, the strength of the joint tape 11 itself, the fixing strength to the air-drying sheet, the flexibility (expandability).

The reason why the lower limit of the density of the yarn 17 in the high density portion H is smaller than the upper limit of the density of the yarn 17 in the low density portion L is as follows.
That is, the optimum point of the density of the yarn 17 shifts in both the high-density portion H and the low-density portion L depending on the type, viscosity, structural viscosity, application method of the waterproof coating, the condition of the ventilation cushioning sheet 41 (fixed surface), and the like. Because. In the present invention, it is essential that at least two types of portions having different densities (opening ratios), that is, a high density portion H and a low density portion L, be present in one joint tape 11.

The density of the warp threads 17a or the weft threads 17b in the high-density portion H is preferably 30 threads/inch or more and 120 threads/inch or less, more preferably 40 threads/inch or more and 110 threads/inch or less, and particularly preferably Is 50 lines/inch or more and 100 lines/inch or less.
Further, the density of the warp yarns 17a or the weft yarns 17b of the low density portion L is preferably 5 threads/inch or more and 45 threads/inch or less, more preferably 10 threads/inch or more and 40 threads/inch or less, Particularly preferably, it is 15 lines/inch or more and 35 lines/inch or less.

In the calculation of the density of the yarn 17, “one yarn” is composed of one yarn (eg, monofilament yarn) whose inside is uniformly packed, one spun yarn made of short fibers, and long fibers. It means one multifilament yarn, "natural fiber or synthetic fiber" that is made into one by strongly aligning or twisting. That is, a single thread that cannot be easily separated is referred to as "one thread" when calculating the density of the thread 17.

For example, Ne10/2s (twisted yarn with a cotton count of 10) is made by twisting two single yarns and twisting them, but they are twisted and cannot be easily separated. Therefore, it is "one thread".
Further, the “thread row 18” such as the “warp thread row 18a” and the “weft thread row 18b” which will be described later have the threads 17 aligned, but can be easily separated into the threads 17, so that the “thread row 18” is It is not a single thread 17. For example, as shown in FIGS. 4(b), (c), 5(d), and 6, when the thread row 18 is formed of four threads 17, one thread row 18 has four threads. It is the thread 17.

From the viewpoint of the method for manufacturing the shedder 12, the structure of the loom, and particularly the structure of the reed, the density of the weft yarns 17b is kept constant, and the high density portion H and the low density portion L are separated by the difference in the density of the warp yarns 17a. It is particularly preferable to form. In that case, the density of the weft yarns 17b is preferably "(the preferable range of the yarn density in the low density region)".

The yarn 17 used as the warp yarn 17a or the weft yarn 17b may be a spun yarn (spun yarn) made of short fibers or a filament yarn (filament yarn) made of long fibers.

At the intersection of the warp yarn 17a and the weft yarn 17b, a raw machine (kibata) that is not subjected to sealing may be used, or a point that is processed with resin may be used. Since the adhesive layer 13 is provided below the opening body 12 of the joint tape 11 of the present invention, it is preferable that the joint tape 11 is not sealed.

There are no particular restrictions on the materials of the warp and weft threads, and materials that are commonly used as materials such as ginseng are selected as appropriate.
For example, natural fibers such as cotton, hemp, wool, and silk; synthetic fibers such as polyester, vinylon, acrylic, nylon, polyethylene, polypropylene, polyvinyl chloride, polyurethane; recycled fibers such as rayon; glass fibers Inorganic fibers such as carbon fibers; metal fibers such as steel fibers.
Of these, cotton, polyester, vinylon, rayon, acrylic, nylon and the like are particularly preferable.

2.2.4.1. The fabric 12 composed of the warp yarns and the weft yarns has the opening 12 of the joint tape 11 that is a "warp yarn 17a" or a warp yarn string in which a plurality of warp yarns 17a are arranged adjacent to each other without being substantially twisted with each other. 18a" and "weft thread 17b" or "weft thread row 18b in which a plurality of weft threads 17b are arranged adjacent to each other in parallel without substantially twisting each other" are configured to have a portion where an opening is present. It is particularly preferable that the above-mentioned "effect of the opening body being a knitted material" can be more suitably exhibited. Especially when the thread row 18 is adopted, it is easy to suitably configure the high density portion H; since the joint tape 11 is flat, it is easy to stick it on the upper surface of the ventilation cushioning sheet 41 before applying the waterproof paint, and the flexibility is high. It is more preferable from the standpoint that the waterproof coating film is less likely to be peeled off because the shift of the ventilation cushioning sheet 41, which is the adhered surface, is easily followed.

As one thread row 18, the warp threads 17a of the high density portion H of [1]-A or [1]-B of FIG. 7 (FIG. 8), or all the weft threads 17b of FIG. 7 (FIG. 8) are used. As shown, two yarns 17 are formed; [2]-A or [2]-B of FIG. 5(b)(c), FIG. 7(FIG. 8), or FIG. As shown in the entire warp yarns 17a of the low density portion L of FIG. 8), those formed of three yarns 17; FIG. 4(b)(c), FIG. 5(d), FIG. 6, FIG. As shown in [3]-A or [3]-B of FIG. 7 (FIG. 8), the thread row 18 is formed of four threads 17; Those in which the thread row 18 is formed; and the like.
The upper limit of the number of threads 17 forming one thread row 18 is preferably 8 or less, more preferably 5 or less, and particularly preferably 4 or less. The lower limit is preferably 2 or more.

From the viewpoint of manufacturing, it is preferable that the high density portion H and the low density portion L of the opening body 12 of the joint tape 11 of the present invention are achieved by the density of the warp threads 17a or the warp thread rows 18a.

2.2.4.2. Thinned woven fabric The opening 12 of the joint tape 11 of the present invention has a shape that is thinned by pressurization, which further improves the "effect of using the thread row 18". It is particularly preferable because it remarkably plays. A schematic sectional view is shown in FIG.
The thinning method is not particularly limited, but it is preferable to perform calendering by passing the woven fabric between rotating calender rolls and heating and pressing.
By applying the calendering process, pressure is applied to the woven fabric, so that the woven fabric becomes flat and the thickness is reduced.

The calender used for calendering is not particularly limited, and known calenders used for calendering non-woven fabrics and cloths can be used.
Regarding the calender rolls, only a pair of calender rolls may be used and the woven fabric may be passed therebetween, a multiple calender roll may be used, or a multi-stage calender roll may be used.
The material of the calender roll is not particularly limited, but a calender roll made of metal is preferable from the viewpoints that the pressing pressure in the width direction of the woven fabric can be made uniform, and can be easily obtained and handled.

The average thickness of the woven fabric before thinning is preferably 0.1 mm or more and 2 mm or less, more preferably 0.15 mm or more and 2 mm or less, and particularly preferably 0.2 mm or more and 1 mm or less.
The average thickness of the woven fabric after thinning is preferably 0.05 mm or more and 1 mm or less, more preferably 0.07 mm or more and 1 mm or less, and particularly preferably 0.1 mm or more and 0.5 mm or less.

The aperture ratio before thinning (V1) and the aperture ratio after thinning (V2) preferably satisfy the following formula (1) in both the high density portion H and the low density portion L.
0.05≦(V1-V2)/V1≦0.5 (3)
If the thinning is performed so as to satisfy the above formula, the above-mentioned "effect of using the yarn row 18" and "thinning effect" can be remarkably exhibited.

2.3. Adhesive layer (2)
The joint tape of the present invention has an opening body 12, an adhesive layer 13, and a release sheet 14 in this order from the top. FIG. 4 shows a schematic partially enlarged cross-sectional view of an example of the joint tape 11 of the present invention when the opening body 12 is a woven fabric.
The adhesive layer 13 is provided for temporarily attaching the joint tape to the ventilation cushioning sheet 41 before applying the waterproof coating so that the joint tape 11 does not move due to wind or the like. Due to the adhesiveness of the adhesive layer 13, the ventilation cushioning sheets 41 adjacent to each other are not firmly fixed to each other. In the joint tape 11 of the present invention, firm fixation is achieved by a waterproof paint or the like applied thereafter.

Adhesive layer 13 is not particularly limited, the opening member (joint tape) 1 m ² per preferably adhesive layer 10 to 30 g / ^{m 2,} more preferably ^{15~25g / m 2, 17~23g / m} 2 is particularly preferable. If the mass ratio of the adhesive layer 13 is too small, sufficient adhesiveness cannot be obtained before applying the waterproof coating, and the joint tape 11 may move or fly due to wind or the like. Further, if the mass ratio of the adhesive layer 13 is too large, the opening 16 may be blocked, or the adhesiveness beyond that may not be improved, which may be wasted.

It is essential that the adhesive layer 13 is provided on at least one surface of the opening body 12 so as not to substantially close the opening 16 at least in the low density portion L. In order to provide the pressure-sensitive adhesive layer 13 in such a form, it is preferable to provide the pressure-sensitive adhesive layer 13 by directly coating the pressure-sensitive adhesive solution or dispersion liquid on at least one surface of the opening body 12.
As a method other than the direct application, there is a method of temporarily transferring the adhesive layer formed on the release paper to the surface of the woven cloth. However, in this method, the opening 16 is blocked, so that when the joint tape 11 is used. The waterproof paint or the like may not reach the back side (lower side) of the joint tape 11.

In order to provide the adhesive layer 13 on at least one surface of the opening body 12 so as not to close the opening 16, the opening 16 is not substantially closed by directly applying an adhesive solution or dispersion having a sufficiently low viscosity. Thus, the adhesive layer 13 is provided.
The method of such direct coating is not particularly limited, but a coating method using a roll coater, curtain coater, brush coating, spray coater, dipping or the like is preferable. It is possible to form the adhesive layer 13 on at least one surface of the opening forming material 15 while not blocking the opening 16 by adjusting the viscosity of the adhesive solution or dispersion to an appropriate viscosity.
The adhesive layer 13 is preferably provided on the entire surface of the opening body forming material 15 in order to improve the sticking property as much as possible.

There is no particular limitation on the material of the pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer 13, and known materials can be used. Specifically, for example, (meth)acrylic acid ester-based, vinyl chloride-based, vinyl acetate-based, vinyl butyral-based, polyisobutylene-based, styrene-butadiene-based, isoprene-based, chloroprene-based, chlorinated rubber-based, or the like, or a combination thereof. A polymerization system etc. are mentioned.

The pressure-sensitive adhesive may be applied in the form of a pressure-sensitive adhesive solution dissolved in an organic solvent, or in the form of a dispersion liquid in which the pressure-sensitive adhesive is dispersed in the form of an emulsion or the like. Above all, it is more preferable to apply as an aqueous emulsion. A (meth)acrylic acid ester type is particularly preferable as a material for the pressure-sensitive adhesive because it is excellent as an aqueous emulsion.

2.4. Release Sheet The joint tape of the present invention has an opening body 12, an adhesive layer 13, and a release sheet 14 in this order from the top. FIG. 4 shows a schematic partially enlarged cross-sectional view of an example of the joint tape 11 of the present invention when the opening body 12 is a woven fabric.
The release sheet 14 is provided so that when the joint tape of the present invention is wound into a joint tape roll, the adhesive layer 13 does not adhere to "the opposite side of the opening body to the side having the adhesive layer". It is provided in order to give appropriate rigidity to the flexible opening body 12 and to make the joint tape 11 easy to handle.
The release sheet 14 is preferably provided on substantially the entire surface of the joint tape (opening body) in order to achieve the above effects. The release sheet 14 is peeled off when the joint tape is used.

The release sheet 14 has at least a release sheet base material and a release layer.
The material of the release sheet base material is not particularly limited, and examples thereof include paper; plastic films such as polyethylene and polypropylene; cloth; Paper is preferable from the viewpoint of coating property of the release agent, cost, etc., but plastic film is preferable from the viewpoint of thinness.
The release sheet base material is preferably transparent or translucent so that the opening of the opening body 12 can be seen from the release sheet 14 side. It is also preferable that the opening 12 has a dark color such as black so that the opening of the opening 12 can be clearly seen from the side opposite to the release sheet 14.

The thickness of the release sheet 14 is not particularly limited, but is preferably 10 μm to 150 μm, more preferably 15 μm to 100 μm, and particularly preferably 20 μm to 70 μm.
If the thickness of the release sheet 14 is too thin, the release sheet 14 may be cut in the middle of peeling and the workability may be deteriorated, or the release sheet 14 may be torn small and remain on the work site.
On the other hand, if it is too thick, it may be useless or the diameter of the joint tape roll may unnecessarily increase.

The material of the release layer of the release sheet 14 is not particularly limited, but silicone resin is preferable from the viewpoint of releasability.

3. Manufacturing method of joint tape The manufacturing method of the above-mentioned "joint tape of the present invention" stuck on the abutting portions 48 of the end portions of the plurality of ventilation cushioning sheets 41 laid on the base 31 is as follows.
(1) The high density portion H is manufactured by reducing the opening ratio in the substantially central portion of the joint tape 11 in the width direction, and the low density portion L is formed by increasing the opening ratio in both widthwise portions. A step of manufacturing to obtain the opening body 12,
(2) A step of directly applying a pressure-sensitive adhesive solution or a pressure-sensitive adhesive dispersion liquid on at least one surface of the opening body 12 so as not to seal the openings 16 at least in the low-density portion L to form the pressure-sensitive adhesive layer 13,
(3) a step of laminating the release sheet 14 on the adhesive layer 13,
It is preferable that the manufacturing method has at least.

The high density portion H and the low density portion L of the opening body 12 may be manufactured by a method using a loom or a knitting machine, or may be a method by punching out a resin film, paper, woven cloth, non-woven cloth or the like. Good.
When a woven fabric is used as the opening body 12, as a manufacturing method of the high density portion H and the low density portion L of the opening body 12, the manufacturing method as described in the embodiment is particularly preferable.

After obtaining the opening body 12 and before forming the adhesive layer 13, it is preferable to press the opening body 12 between two calender rolls to apply pressure to thin the leaves. As the thinning method, the method described in “2.2.4.2. Thinned woven fabric” is preferably used.

The method described in “2.3. Adhesive layer (No. 2)” is preferably used for forming the adhesive layer 13.
Further, the release sheet 14 is laminated by a usual method, preferably on the entire surface of the opening body 12.

4. Coating film waterproofing method The coating film waterproofing method in which the joint tape 11 of the present invention is used for the ventilation cushioning sheet 41 is preferable in order to achieve the above-mentioned effects.
The coating film waterproofing method of the present invention is characterized by having at least the following steps (1), (2) and (3).
(1) a step of laying a plurality of ventilation cushioning sheets 41 on the base 31;
(2) A step of adhering the joint tape 11 on the abutting portions 48 of the end portions of the ventilation cushioning sheet 41 while peeling off the release sheet 14.
(3) A step of applying a waterproof coating from above the joint tape 11 so that a large amount of coating passes through the low-density portion L rather than the high-density portion H,

In the step (1), a plurality of ventilation cushioning sheets 41 are laid on the base 31 such as the holding concrete. The ventilation cushioning sheet 41 is laid by a usual method.
For example, in Japan, one or ^two de-cylinders are obliged to be installed in 100 m ² by the “Construction standard specifications JASS 8 waterproofing work”, but in the coating film waterproofing method of the present invention, adjacent ventilation is performed. Since gas circulation between the cushioning sheets 41 is ensured, it is not necessary to install a de-cylinder for each of the plurality of ventilation cushioning sheets 41, and the coating waterproof layer 51 and the top coat layer 52 float (swell). do not do.

In the step (2), the joint tape 11 of the present invention is attached onto the abutting portions 48 of the end portions of the ventilation cushioning sheet 41 while the release sheet 14 is peeled off.

In the step (3), the waterproof paint is applied from above the joint tape 11 so that a large amount of the paint passes through the low density portion L rather than the high density portion H.
When the joint tape 11 of the present invention is used, the waterproof coating does not flow into the abutting portions 48 of the end portions of the air-permeable cushioning sheet 41 even if a normal coating method is used, and the low-density portions L on both sides of the waterproof coating are waterproof. The paint suitably reaches the upper surface of the ventilation cushioning sheet 41, which is the adhered surface, and the firm adhesion of the joint tape 11 is achieved.
In the coating film waterproofing method using the joint tape 11 of the present invention, the opening ratio of the high density portion H and the low density portion L is adjusted (adjusted) so that the passage of the waterproof coating is 0% ( It can be arbitrarily adjusted from (not passing) to 100% (passing freely).

There is no particular limitation on the type of waterproof paint, and known materials can be used, but urethane waterproof material, urea waterproof material, polymer cement waterproof material, FRP (fiber reinforced plastic) waterproof material, cold-work asphalt waterproof material, etc. are preferably used. it can. The coating method is also not particularly limited, and known methods can be used.
Further, as the solvent of the waterproof paint and the solvent as the diluent, any known solvent can be used.
The waterproof coating may be one-layer coating, two-layer coating (with an intermediate coating layer) or more. Furthermore, it is preferable to provide a top coat layer 52 as the uppermost layer.

5. Coating film waterproof layer The type of the coating film waterproof layer 51 is not particularly limited, and those described above are used.
The waterproof coating layer 51 obtained by using the waterproof coating method described above does not have cracks or the like in the waterproof coating layer 51 or the top coat layer 52 near the upper edge of the joint tape 11, and the joint tape 11 is It does not peel off.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples as long as the gist thereof is not exceeded.

Example 1
Repair work on the urethane waterproof coating on the rooftop concrete was performed. On the rooftop, there was a holding concrete with a side of 3 m and a grid having a joint width of 20 mm. The existing urethane waterproof coating was scented, and the joint material was filled in the joint, so that joint material was removed.
A cover sheet material (manufactured by Shu Company, Ltd., trade name "Medical Keeper" (registered trademark)) was placed over the joints of the holding concrete so as to cover and cover the joints.

Next, a ventilation cushioning sheet (manufactured by Daiflex Co., Ltd., trade name "Mat SB") was spread. The breathable cushioning sheet used had a total thickness of about 1.2 mm, a width of the ventilation passage of 3 mm, a width of the ventilation passage (thickness of the adhesive layer) of about 0.5 mm, and a thickness of the ventilation layer of about 0.3 mm. ..

The joint tape of the present invention in the form shown in FIG. 3(a) was adhered onto the abutting portion of the end portions of the air-permeable cushioning sheet while peeling off the release sheet.
The joint tape used had a width of 10 cm, a high-density portion was present in the approximate center of the joint tape, and its width was 3.5 cm. The material is polyester, and the density of warp yarns in the high-density portion is 50 yarns/inch, and the "density of weft yarns in the high-density portion" and "density of warp yarns and weft yarns in the low-density portion" are both 20 yarns/inch. Met.
The aperture ratio (S1) of the high density portion was 15%, and the aperture ratio (S1) of the low density portion was 50%.

The roof was windy because of the adhesive layer, but the joint tape was not blown off.

Then, a waterproof paint (manufactured by Daiflex Co., Ltd., one-component urethane waterproof paint) was applied with a squeegee so as to have an average film thickness of 3 mm and cured to form a waterproof film layer.
After that, a top coat layer (“Cosmic Top P” manufactured by Daiflex Co., Ltd.) was formed.

From the low density part of the joint tape, the waterproof paint flowed down and the joint tape could be firmly fixed to the ventilation cushioning sheet. The waterproof paint did not flow down from the high density portion of the joint tape, and the waterproof paint did not flow into the abutting portion of the adjacent ventilation cushioning sheets, ensuring ventilation.
Since the edge of the joint tape had almost no step, the waterproof coating layer on the edge of the joint tape did not become thin locally along the edge.

There was no change over time, the joint tape did not peel off even when the ventilation cushioning sheet was displaced, and no cracks were formed in the waterproof coating layer or the top coat layer above the edge of the joint tape.

Example 2
In Example 1, the ventilation cushioning sheet was replaced with the product name "Tack Sheet S" manufactured by Nippon Special Coating Co., Ltd.
As a waterproof paint, a two-component mixed type curable urethane waterproof paint (“Cosmic Pro 12” manufactured by Daiflex Co., Ltd.) was applied with a metal iron to an average film thickness of 1.5 mm. A lower layer coating film was formed. After the lower layer coating film was completely cured, an intermediate urethane waterproof coating material was applied using a metal iron to form a film thickness of 1.5 mm.
Although the air-permeable cushioning sheet and the waterproof paint were changed, the same excellent results were obtained as in Example 1, and the joint tape of the present invention exerts an excellent effect regardless of the type of the air-permeable cushioning sheet or the waterproof paint. I understood.

Production example 1
As warp and weft, Ne30/1s (single yarn of cotton count 30) polyester spun yarn was used, and a reed was used to produce an opening made of 6 kinds of fabrics as follows.

<High density area>
Using "a reed part (the reed part having 22 feathers/inch on the side and 21 yarn paths)", "2, 3, 4/ By changing the number of "thread paths" and the number of warp threads and passing a plurality of warp threads through one thread path, three kinds of warp rows consisting of two, three, and four warp threads are formed and opened. The high density part of the body was formed with a width of 3.5 cm.
There was no unused yarn path in the formation of the high density part.
All the weft threads are unified into "one weft thread row with two weft threads".

2 warp threads/thread path (2 warp threads form 1 warp row) [1], 3 warp threads/thread path (3 warp threads form 1 warp row) [2], warp thread 4 The book/thread path (one warp row is formed by four warp threads) is numbered [3].

<Low density part>
Using the same reed as the high-density portion, three yarns were always passed through the yarn path (note that some yarn paths do not pass through the yarn, as described below).
Using one of the three yarn paths (skipping the two yarn paths), a low density part of type A was produced. Therefore, 7 yarn paths/inch are used.
Using one of the two yarn paths (skipping one yarn path), a low density part of type B was produced. Therefore, 10.5 yarn paths/inch is used.
For both the high density part of the warp threads (rows) and the low density part of the warp threads (rows) (for the whole), the weft threads (rows) are made to pass through at the same time. In the same manner as the high-density portion, the low-density portion was unified as "one weft row with two weft threads" (16 threads/inch).

Using the dropper, the warp yarn row was raised and lowered every time one weft yarn row was passed, and 6 kinds shown in Table 1 below were manufactured.
Then, the acrylic EVA resin was impregnated, and the intersection of the warp yarn and the weft yarn was adhered using a pin tenter dryer.

Then, it was calendered. It was thinned by calendering with a calendar machine (Yuri Roll Co., Ltd., TYPE: HPCM).
The calender rolls were a pair of (two) calender rolls, one calender roll made of iron having a roll diameter of 350 mm, and the other calender roll made of resin having a roll diameter of 500 mm.
The iron calender roll being treated was heated to 150° C., the linear pressure applied to the ginseng was 780 kgf/cm, and the running speed was 10 m/min.

Then, using a general roll coater, an aqueous emulsion of an acrylic acid ester copolymer (manufactured by Toyo Ink Mfg. Co., Ltd., acrylic adhesive, BPW6111) was directly applied onto the above-mentioned opening body. The coating amount was 20.0 g per 1 m ² of the opening body as a solid content after the dispersion medium (mainly water) was distilled off (after drying).

Actually, the above-mentioned “reed part having 21 yarn paths” was used to manufacture a plurality of rows of opening bodies at the same time by using a plurality of reeds that were arranged side by side. A joint tape (opening body) having a width of 10 cm and a high-density portion having a width of 3.5 cm were cut out from the above.
That is, the center of the low-density portion is cut with a slitter so that the high-density portion with a width of 3.5 cm is at the center, and cut out to have a width of 10 cm, and "low-density portion 3.25 cm-high-density portion 3.5 mm-low" An “opening body and an adhesive layer” of 10 cm in total having a density portion of 3.25 mm” was manufactured.
The total average thickness of the "opening body and the adhesive layer" before laminating the release sheet was 0.25 mm.

Release sheets (made of polypropylene, colorless and semitransparent, and 50 μm in thickness) were laminated to manufacture the joint tape of the present invention. Further, it was wound to obtain a joint tape roll.

Measurement example <Aperture ratio measurement>
Ten openings were randomly selected and the vertical and horizontal lengths were measured with a caliper.
The opening was approximated as a rectangle, and the product of the vertical length and the horizontal length of the opening was defined as the opening area. A value obtained by dividing the open area by "the total area obtained by adding the open area and the area of the thread portion" was defined as the open area ratio.

<Measurement of average thickness>
The position of the woven fabric was randomly measured at 10 points with a thickness measuring device (manufactured by Peacock, Model G) of JIS L 1096 A method, and the average value was taken as the average thickness.

The forms of the obtained joint tape openings and joint tapes are summarized in Tables 1 and 2. A photograph of the obtained joint tape is shown in FIGS. 7 and 8.

Example 3
When six types of joint tapes obtained in Production Example 1 were evaluated in the same manner as in Example 1 and Example 2, the six types obtained in Production Example 1 were provided with an adhesive layer, and therefore the roof had wind. It was strong, but the joint tape was never blown.
When a waterproof paint was applied and evaluated in the same manner as in Examples 1 and 2, the waterproof paint flowed down from the low density portion of the joint tape in all six types, and the joint tape was firmly fixed to the ventilation cushioning sheet. I was able to do it.
On the other hand, from the high density portion of the joint tape, the waterproof paint does not flow into the abutting portion of the adjacent air-permeable cushioning sheets for all six types, and as a result, ventilation between the adjacent air-permeable cushioning sheets is ensured, and the coating film waterproof layer is formed. No local lifting (swelling) occurred. Installation of the de-cylinder was also sufficient according to the regulations.

Regarding the high-density portion, in more detail, in Example 2, the waterproof coating material (two-component mixed type curable urethane waterproof coating material (manufactured by Daiflex Co., Ltd., "Cosmic Pro 12")) was used without dilution. In this case, from the high-density parts of [1]-A and [1]-B, the waterproof coating passes under the joint tape to a suitable degree, that is, to the extent that it does not drip to the back, and to the abutting part of the ventilation cushioning sheet. While ensuring the characteristics that the waterproof paint does not flow in, it firmly adheres to the ventilation cushioning sheet.
Waterproof paint does not pass under the joint tape from the high density parts of [2]-A, [2]-B, [3]-A and [3]-B, and it is waterproof to the abutting part of the ventilation cushioning sheet. It was possible to completely secure the characteristics that the paint did not flow.

Regarding the high-density portion, in Example 2, a waterproof coating (a two-component mixed type curable urethane waterproof coating (manufactured by Daiflex Co., Ltd., "Cosmic Pro 12")) was used, and xylene was added to the entire waterproof coating in an amount of 5%. When used by adding mass% (that is, when diluted to a low viscosity), waterproof paint wraps around the back of the joint tape from the high density part of [1]-A and [1]-B, The waterproof paint did not flow into the butted portion of the cushioning sheet, further strengthening the adhesion to the ventilation cushioning sheet.
From the high density parts of [2]-A and [2]-B, the waterproof paint passes under the joint tape to an appropriate degree, that is, to the extent that it does not drip to the back, and the waterproof paint is applied to the abutting part of the ventilation cushioning sheet. While completely securing the property that does not flow into, the adhesiveness to the ventilation cushioning sheet was strengthened.
From the high density portions of [3]-A and [3]-B, the waterproof paint did not pass under the joint tape, and the characteristic that the waterproof paint did not flow into the abutting portion of the ventilation cushioning sheet could be completely secured.

It has been found that the joint tape of the present invention can arbitrarily control the passing amount (passing rate) of the waterproof coating by adjusting the opening ratios of the high density portion H and the low density portion L.
Also, the opening ratio of the opening of the joint tape and the density of threads (rows), especially the opening ratio and the density of threads (rows) in the high-density part, depend on the type of waterproof paint, the viscosity of the waterproof paint, the type of waterproofing work, etc. , I found it possible to use properly.

All of the six types of joint tape obtained in Production Example 1 have a portion having an opening, and since the average thickness is thin, there is almost no step on the edge of the joint tape and The waterproof coating applied on top did not thin locally along the edges of the joint tape. As a result, the coating waterproof layer and the top coat layer were not cracked.
Further, since the six types of joint tapes are also flexible and expand and contract, even if the adjacent air-permeable cushioning sheets deviate relative to each other over time, they do not separate from one and follow both air-permeable cushioning sheets. As a result, the film waterproof layer and the top coat layer thereon did not crack.

Comparative Example 1
Using an ordinary adhesive tape type joint tape (commercially available product) (average thickness 0.3 mm) in which an adhesive layer is applied to a base material and wound in a roll shape, as in Examples 1 and 2 Evaluated to.
Since the waterproof paint did not pass under the joint tape at all, the joint tape could not be firmly fixed to the ventilation cushioning sheet. Also, the waterproof coating on the joint tape was not reinforced at all.

Further, since there is a step on the edge of the joint tape, the waterproof coating layer applied to the upper portion of the edge of the joint tape became thin locally along the edge of the joint tape. As a result, the water resistance of that portion was poor.
In addition, since the joint tape is not flexible and does not expand or contract, when the adjacent air-permeable cushioning sheets deviated from each other over time, they were peeled off from one of them, and cracks were formed in the waterproof coating layer or the top coat layer thereon.

Comparative example 2
An attempt was made to manufacture a joint tape to which a "narrow adhesive tape" was separately attached so that the waterproof paint would not pass through the approximately 3.5 cm width in the central portion of the opening body in the width direction.

Obtain the opening body to which the adhesive layer A is applied, peel off the protective release paper of the adhesive layer A, and then peel off the protective release paper of the adhesive layer B from the narrow adhesive tape. "Adhesive tape" was attached to the opening body by the adhesive layer B. After that, an adhesive layer C as a joint tape was again provided on the side opposite to the adhesive layer B (the side having no adhesiveness). Due to the adhesive strength of the adhesive layer A, the side without the adhesive layer B of the "narrow adhesive tape" could not be firmly adhered to the opening body, so if an adhesive layer was to be provided on the entire surface of the joint tape. Finally, the adhesive layer C as the joint tape had to be provided again.

As a result, the number of manufacturing steps is increased by about 5 to 6 as compared with the method for manufacturing the joint tape of the present invention, which is not practical in terms of cost.
In addition, a composite having a "narrow adhesive tape" in the central part was formed, but the joint tape could not be obtained as an integrated one.

INDUSTRIAL APPLICABILITY The joint tape of the present invention and the waterproof coating method using the joint tape have excellent adhesion to the ventilation cushioning sheet of the joint tape, the coating waterproof layer does not become thin at the edge portion, and the ventilation cushioning sheet with the passage of time. It is widely used in the field of coating film waterproofing in many places including the rooftop because it follows the gap and the cracks in the coating film waterproof layer and the top coat layer on it do not easily occur.

11 Joint Tape 12 Opening Body 13 Adhesive Layer 14 Release Sheet 15 Opening Body Forming Material 16 Opening 17 Thread 17a Warp Thread 17b Weft Thread 18 Thread Row 18a Warp Thread Row 18b Weft Thread Row H High Density Area L Low Density Area 31 Underground 41 Air Buffer Sheet 42 Air-permeable buffer sheet base material 43 Reinforcement layer 44 Air-permeable layer 45 Adhesive layer 46 Buffer layer 47 Air-passage channel 48 Butt portion 51 Waterproof film layer 52 Top coat layer

Claims (12)

A joint tape which is affixed to the abutting portion of the end portions of a plurality of air-permeable cushioning sheets laid on the base,
In order from the top, having an opening body having an opening portion, an adhesive layer, and a release sheet,
The opening body is formed of warp threads and weft threads,
In the opening body, a substantially central portion in the width direction of the joint tape has a high density portion due to a high density of the warp yarns or the weft yarns, and a high density portion is formed. Since the density of the warp or the weft is low, the aperture ratio is increased to form a low density portion,
The joint tape, wherein the adhesive layer is provided so as not to seal the opening at least in the low density portion. The joint tape according to claim 1, wherein the opening ratio (S1) of the high-density portion is 0% or more and 70% or less. The joint tape according to claim 1 or 2, wherein the opening ratio (S2) of the low-density portion is 20% or more and 90% or less. The joint tape according to any one of claims 1 to 3, wherein the opening body is a plain weave fabric or a leno weave fabric. Warp or weft density of the upper Symbol dense portion is not more than 30 / inch or 120 lines / inch, warp or weft density of the low density portion is not more than 45 / inch or 5 lines / inch It claims 1 joint tape according to any one of claims 4. The opening body is a warp yarn or a "warp yarn row in which a plurality of warp yarns are arranged adjacently in parallel without being substantially twisted with each other", and a weft yarn or "a plurality of weft yarns are substantially twisted with each other. 6. The joint tape according to any one of claims 1 to 5, wherein the joint tape is configured so as to have a portion in which an opening is present, instead of adjacent weft rows arranged in parallel. .. The joint tape according to claim 6, wherein the high-density portion and the low-density portion are achieved by the density of the warp threads or the warp rows. The joint tape according to any one of claims 1 to 7, wherein the opening has a shape that is thinned by pressing. The method for producing a joint tape according to any one of claims 1 to 8, wherein the plurality of air-permeable cushioning sheets laid on the base are pasted on the abutting portions of the end portions of each other. hand,
The high density portion is manufactured by reducing the opening ratio at the substantially central portion of the joint tape in the width direction, and the low density portion is manufactured by increasing the opening ratio on both sides in the width direction to form the opening body. The process of obtaining,
A step of forming a pressure-sensitive adhesive layer by directly applying a pressure-sensitive adhesive solution or a pressure-sensitive adhesive dispersion on at least one surface of the opening body so as not to seal the opening at least in the low-density portion,
And a step of laminating a release sheet on the adhesive layer. The joint tape according to claim 9, wherein after the opening body is obtained and before the adhesive layer is formed, the opening body is pressed by passing it between two calender rolls to be thinned. Manufacturing method. Laying a plurality of ventilation cushioning sheets on the base,
A step of adhering the joint tape according to any one of claims 1 to 8 on the abutting portions of the end portions of the ventilation cushioning sheet while peeling off the release sheet;
A step of applying a waterproof paint from above the joint tape to pass a large amount of paint to the low density part rather than the high density part,
A coating film waterproofing method comprising at least: A coating film waterproof layer, which is obtained by using the coating film waterproofing method according to claim 11.