JP2020153176A - Multi-layer underlay tape - Google Patents

Abstract

To provide an underlay tape with extremely excellent cut resistance.SOLUTION: A multi-layer underlay tape 1 is formed by sandwiching a net-like sheet 4 between an upper layer film 2 and a lower layer film 3 and adhesively fixing the upper layer film 2 and the lower layer film 3 together with the net-like sheet 4 only at both ends. By appropriately selecting each member, adhesive, etc. that constitute the multi-layer underlay tape 1, when the cut resistance measurement test of the multi-layer underlay tape 1 is performed under specific measurement conditions using a specific cut resistance measuring device, the penetration rate, which indicates the proportion of the penetration portion, should be less than 75%.SELECTED DRAWING: Figure 2

Description

The present invention relates to an underlay tape that is temporarily installed and used between the base material and the wallpaper superposition portion in order to protect the base material when cutting the overlay portion of the wallpaper (cloth). More specifically, the present invention relates to a multi-layer type underlay tape having extremely excellent cut resistance.

In the interior work of the wall surface and ceiling surface of a building, it is common to attach wallpaper to the surface of a base material such as gypsum board. As the wallpaper, for example, a standard-sized product having a width of 95 cm manufactured with a predetermined width is used. When the standard-sized product is attached to a base material that becomes a wide wall surface or ceiling surface, the wallpaper is attached to the base material while being joined together. At that time, the joint portion overlaps the side portion of the wallpaper with the side portion of another wallpaper adjacent to the wallpaper (overlapping), and in that state, the overlapped portion is continuously cut with a knife such as a cutter knife. , Unnecessary wallpaper other than the wallpaper to be attached to the base material will be removed.

When cutting and removing the wallpaper with a knife, the cutting edge of the knife will penetrate the wallpaper, so in order not to damage the base material, an underlay tape that protects the base material is placed between the base material and the wallpaper. It is generally installed temporarily. The underlay tape is removed from the sides of the expanded wallpaper after cutting the wallpaper.

FIG. 4 shows an example of cutting the wallpaper using the underlay tape. The adjacent wallpaper 11 and the wallpaper overlapping portion 11A of the wallpaper 11 are cut by a cutting tool such as a cutter knife (in FIG. 4A, the cut portion 11B is shown by a dotted line). At this time, if the wallpaper overlapping portion 11A is cut as it is, the base material 10 will be damaged. Therefore, the underlay tape 1 is cut while being sandwiched between the wallpaper overlapping portion 11A and the base material 10. ..

The wallpaper 11 has a structure in which an adhesive (glue) is applied to the surface to be attached to the base material 10 (the back surface of the wallpaper) so that the wallpaper 11 can be easily attached to the base material 10 after cutting. Remove the scraps and the underlay tape 1 and abut the sides of the wallpaper 11 against each other.
At this time, if the construction is good, the surface to be the finished surface becomes a smooth surface, and the butt portion 12 has a beautiful finish that is difficult to distinguish (FIG. 4B).

The underlay tape is required to have sufficient flexibility so as not to deteriorate the cutting edge of the blade and not to scrape off the adhesive (glue) of the wallpaper when it is removed.

In addition, if the underlay tape has insufficient cut resistance, when cutting the wallpaper, the cutting edge of the blade penetrates the underlay tape and scratches the base material, and these scratches are made on the surface of the cloth after the cloth has been attached. It appears as a recess and spoils the aesthetic appearance, and in the case of a deep scratch, the part becomes a gap and the wallpaper is not sufficiently adhered, which may cause a problem that the wallpaper is peeled off from the part. The tape is required to have sufficient cut resistance.

In order to impart sufficient cut resistance to the underlay tape, various studies have been made on the material and shape of the underlay tape.

In Patent Document 1, a break transmission blocking layer is laminated between two resin film layers, so that even if a break occurs at the cutting edge in the resin film layer that is in contact with the wallpaper during cutting, the break is in contact with the base. An underlay tape is described that prevents it from being transmitted to.

Patent Document 2 describes an underlay tape formed of a woven fabric in which a warp made of a synthetic resin plain thread and a weft made of a synthetic resin plain thread having a thickness larger than the warp are woven in a plain weave.

Patent Document 3 describes an underlay tape in which a sheet in which a plastic film is laminated on at least one side of a plain-woven woven fabric in which the warp is a flat yarn and the weft is a monofilament is slit in the vertical direction with a predetermined width.

In Patent Document 4, a cloth-like body formed by intersecting a plurality of warp threads made of synthetic resin and a plurality of weft threads made of flat yarn made of synthetic resin are laminated on at least one surface of the cloth-like body. In the tape base material formed of the thermoplastic resin film, the underlay tape in which the weft of the cloth-like body is made thicker than the warp and the space ratio of the warp and the weft is set in a specific range is described.

Patent Document 5 describes an underlay tape in which a net-like knitted fabric formed by adhesively fixing the intersections of threads of each of the horizontal and vertical synthetic resin fibers is attached to a synthetic resin film.

Patent Document 6 describes a tape that is placed under the joint portion of the cloth to be attached to the base board to protect the base board and is formed of a flexible synthetic fiber or a natural fiber. Described is an underlay tape in which a synthetic resin film is covered on both the front and back surfaces of the reticulated sheet, and only the both side edges of the reticulated sheet and the front and back synthetic resin films are adhered to each other.
In Patent Document 6, nylon, vinylon, polyester, polypropylene, polyethylene, and natural fibers are mentioned as the material of the synthetic yarn constituting the net-like sheet, and nylon is preferable.

When performing work using the underlay tape of the above-mentioned prior art, depending on the skill level of the builder, the base material 10 may be damaged due to excessive force during cutting, or the base material may be damaged. In some cases, the work efficiency was lowered due to being too careful not to damage the 10.
For this reason, it is desired to develop an underlay tape that has even better cut resistance and is easy to use even for inexperienced workers.

Japanese Unexamined Patent Publication No. 2004-197396 Japanese Unexamined Patent Publication No. 2008-12149 Japanese Unexamined Patent Publication No. 2009-248250 Japanese Unexamined Patent Publication No. 2015-036486 Utility Model Registration No. 3192127 Japanese Unexamined Patent Publication No. 2004-019411

The present invention has been made in view of the above background technique, and an object of the present invention is to provide an underlay tape having extremely excellent cut resistance.

As a result of diligent studies to solve the above problems, the present inventor has put a net-like sheet between two films and adhered only both ends to the multi-layered underlay tape. We have found that the cut resistance of the underlay tape can be made extremely excellent by appropriately selecting an adhesive or the like, and have completed the present invention.

That is, in the present invention, when the wallpaper is attached to the surface of the base material, the base material and the wallpaper superposition portion are cut when the wallpaper superposition portion is cut in a state where the edges of the adjacent wallpaper are overlapped with each other. It is a multi-layered underlay tape that is temporarily installed between and to protect the base material.
The upper layer film with the net-like sheet sandwiched between the upper layer film located on the side of the wallpaper superposition portion at the time of installation and the lower layer film located on the side of the base material at the time of installation. And the lower layer film are adhesively fixed together with the net-like sheet only at both ends.
The net-like sheet is composed of warp threads substantially parallel to the longitudinal direction of the multi-layer type underlay tape and weft threads substantially orthogonal to the warp threads and crossing the multi-layer type underlay tape in the width direction.
A cut body fixing means for horizontally fixing the cut body to the substrate, a blade holder for holding a blade for cutting the cut body, and a blade holder for lowering the blade holder in a substantially vertical direction. The cutting edge piercing means for contact-loading the cutting edge of the blade so as to pierce the cut body by moving the blade so as to pierce the cut body, and the blade holding body horizontally while contact-loading the cutting edge of the blade with the cut body. When a cut resistance measurement test is carried out under the following measurement condition A using a cut resistance measuring device having a blade holder moving means for moving in a direction, the penetration rate is less than 75%. It is intended to provide a multi-layered underlay tape.

<Measurement condition A>
The multi-layered underlay tape is fixed to the incision fixing means with the upper film facing up, and the cutting edge of the blade is pierced into the multi-layered underlay tape at an angle of 30 °, and a load of 629 gf is applied to the cutting edge. After moving the blade holder horizontally by 14 cm at a speed of 3 m / min, remove it from the incision fixing means, and set the 10 cm part excluding the initial 4 cm as the measurement target area to check for penetration. Observe and let the total value of the penetrating part (excluding the penetrating part having a length less than the weft spacing) be L [cm], and let (L / 10) × 100 be the penetrating rate [%].

The multi-layered underlay tape of the present invention is extremely excellent in cut resistance, and can sufficiently prevent the base from being scratched when the wallpaper superposition portion is cut, and as a result, Problems such as poor construction and peeling of wallpaper after construction are unlikely to occur.

It is a figure which shows each member which comprises the multi-layer type underlay tape of this invention. It is a figure which shows the multi-layer type underlay tape of this invention. It is a figure which shows the state which wound the multi-layer type underlay tape of this invention in a roll shape. It is a figure which shows the usage method of the multi-layer type underlay tape of this invention. It is a schematic diagram which shows the cut resistance measuring apparatus used for measuring the cut resistance. (A) The state where the cutting edge of the blade is not pierced into the cut body (multi-layer type underlay tape) (b) The cutting edge of the blade is pierced into the cut body (multi-layer type underlay tape) to cut the cut body. State before starting (c) State after completing cutting of the incised body (multi-layered underlay tape)

Hereinafter, the present invention will be described, but the present invention is not limited to the following embodiments, and can be arbitrarily modified and carried out.

FIG. 4 shows how to use the multi-layer underlay tape of the present invention. The multi-layer type underlay tape 1 of the present invention is used to attach the wallpaper 11 to the surface of the base material 10, and when cutting the wallpaper superposition portion 11A in a state where the edges of the adjacent wallpaper 11s are overlapped with each other. It is temporarily installed between the base material 10 and the wallpaper superimposing portion 11A, and is used to protect the base material 10 (FIG. 4A). After the cutting operation is completed, the multi-layer underlay tape 1 is removed.
As described above, when the wallpaper overlapping portion 11A is cut with a knife when the wallpaper 11 is attached, the base material 10 (gypsum board or the like) may be cut. By using the multi-layered underlay tape 1 of the above, the base material 10 is less likely to be continuously scratched.

The multi-layer underlay tape 1 of the present invention is composed of three members, an upper film 2, a lower film 3, and a net-like sheet 4, as shown in FIG. In the multilayer type underlay tape 1 of the present invention, as shown in FIG. 2, the upper layer film 2 and the lower layer film 3 are held in a state where the net-like sheet 4 is sandwiched between the upper layer film 2 and the lower layer film 3. , Only the adhesive portions 1A at both ends are adhesively fixed together with the net-like sheet 4.

The central portion of the multi-layer underlay tape 1 of the present invention is a non-fixed portion that is not adhesively fixed, and when cutting the wallpaper, the blade comes into contact with the central portion. In the central portion, since the net-shaped sheet 4 is not fixed to the films on both sides (upper layer film 2 and lower layer film 3), the weft 4A is in a state where it can move freely. Therefore, when the cutting tool comes into contact with the weft thread 4A, the weft thread 4A is pulled in the moving direction of the cutting edge, the feeling is transmitted to the builder, and excessive force is applied to prevent the base material 10 from being damaged. Can be done. Further, even if the base material 10 is scratched, the scratch is not a continuous linear scratch but a dot-shaped scratch, and the problem that the wallpaper 11 is peeled off is unlikely to occur.

The multi-layer underlay tape 1 of the present invention has a penetration rate of 75, which indicates the proportion of the penetration portion, when the cut resistance measurement test is performed under specific measurement conditions using a specific cut resistance measuring device. It is less than%.

The "specific cut resistance measuring device" includes the cut body fixing means T11 for horizontally fixing the cut body S to the substrate T10 and the cut body S for cutting the cut body S, as shown in FIG. By moving the blade holder T12 for holding the blade B and the blade holder T12 so as to lower in a substantially vertical direction, the cutting edge B1 of the blade B is brought into contact with the cut body S. A cut resistance measuring device having a cutting edge piercing means for loading and a cutting edge holding body moving means T15 for moving the cutting edge holding body T12 in the horizontal direction while contact-loading the cutting edge B1 of the cutting tool B with the cut body S. It is T1.
This cut resistance measuring device T1 is a cut resistance measuring device disclosed as "Aspect 2" in Japanese Patent Application Laid-Open No. 2018-185152.

The cut resistance measuring device T1 shown in FIG. 5 has a cut body fixing means T11 that horizontally fixes the cut body S, which is a sheet-like material, to the substrate T10. By moving the blade B in the horizontal direction while the blade B is in contact with the cut body S horizontally fixed to the substrate T10 by the cut body fixing means T11, the cut resistance of the cut body S is achieved. Test your creativity.
The cut resistance measuring device T1 has a blade holder 12 that holds a blade B for cutting the cut S. The blade holder T12 includes a holding portion T16 for holding the blade B.
The cut resistance measuring device T1 has a blade holder moving means T15 that moves the blade holder T12 in the horizontal direction while bringing the blade edge B1 of the blade B into contact with the cut body S. The cut resistance of the cut body S is tested by moving the blade holder T12 (cutting edge B1) in the horizontal direction while the cutting edge B1 of the cutting tool B is in contact with the cut body S.
The cut resistance measuring device T1 has a rod-shaped weight holding means T14 having a holder portion T14a, and by changing the number of weights, the load applied by the cutting edge B1 of the cutting tool B to the cut body S can be adjusted. This can be done (note that the weight is not shown in FIG. 5).

FIG. 5A shows a state before starting the measurement of cut resistance. The incised body S, which is a sheet-like object, is fixed on the horizontally arranged substrate T10 by the incised body fixing means T11.
The cutting edge B1 of the cutting tool B is held by the cutting tool holder T12 in a state of being located above the cut body S.
When starting the measurement, the blade holder T12 is lowered in the vertical direction by the blade holder moving means T15. As a result, as shown in FIG. 5B, the cutting edge B1 of the cutting tool B is in a state of being pierced into the cut body S.
Next, the blade holder T12 is horizontally moved to the right by the blade holder moving means T15. As a result, the blade B moves horizontally together with the blade holder T12 (the state after the horizontal movement is shown in FIG. 5 (c)).
By this operation, the cut body S receives a constant load from the cutting edge B1 to cut the portion in contact with the cutting edge B1.

The "specific measurement condition" refers to the following measurement condition A.

<Measurement condition A>
The multi-layered underlay tape 1 is fixed to the cut object fixing means T11 with the upper layer film 2 facing up, and the cutting edge B1 of the cutting tool B is pierced into the multi-layered underlay tape 1 at an angle of 30 °. With a load of 629 gf applied to the cutting edge B1, the blade holder T12 was horizontally moved 14 cm at a speed of 3 m / min, then removed from the incision fixing means T11, and the portion of 10 cm excluding the initial 4 cm. The presence or absence of penetration was observed as the measurement target area, and the total value of the penetration portion (excluding the penetration portion having a length equal to or less than the interval of the weft 4A) was set to L [cm], and (L / 10) × 100 was set. , Penetration rate [%].

Immediately after the start of horizontal movement, it is easily affected by rattling of the device, so under the above measurement condition A, the initial 4 cm is excluded from the evaluation. In addition, since dot-shaped scratches do not pose a problem during construction, even if a penetrating portion having a length equal to or less than the interval of the weft 4A is seen in the multi-layer underlay tape 1, the performance of the multi-layer underlay tape 1 is Since it does not matter, the penetrating portion having a length equal to or less than the interval of the weft 4A is excluded when calculating the total value (L) of the penetrating portion.

The multi-layer type underlay tape 1 of the present invention is characterized in that the penetration rate calculated as described above is less than 75%.
The penetration rate is preferably less than 50%, more preferably less than 25%, and 0% (that is, when the cut resistance measurement test is performed under the above measurement condition A, the measurement target region No penetration occurs) is particularly preferred.
In addition, "no penetration occurs" means that there is no continuous penetrating portion having a length exceeding the interval of the weft 4A (as described above, there is a penetrating portion having a length equal to or less than the interval of the weft 4A). However, there is no problem with the performance of the multi-layer underlay tape 1).

The multi-layer type underlay tape 1 of the present invention is formed by adhering and fixing three members, an upper layer film 2, a lower layer film 3, and a net-like sheet 4, and by appropriately selecting each member, an adhesive, or the like. , The multi-layer type underlay tape 1 that satisfies the above-mentioned penetration rate requirement can be obtained.

The tape width of the multi-layer underlay tape 1 of the present invention is preferably 20 mm or more, more preferably 25 mm or more, and particularly preferably 30 mm or more. Further, it is preferably 100 mm or less, more preferably 80 mm or less, and particularly preferably 50 mm or less.
When the tape width is equal to or more than the above lower limit, there is a margin that the butt portion 12 fits within the width of the multi-layer type underlay tape even when the vertical positions of the wallpapers 10 are displaced horizontally when installing the multi-layer type underlay tape. Of course, the width of the central portion (non-fixed portion) can be sufficiently secured, and the weft 4A is easily pulled, so that the above effect can be easily obtained. When the width is not more than the above upper limit, it is advantageous in terms of cost; the amount of glue scraped off from the wallpaper 10 can be reduced; the vicinity of the butt portion 12 is less likely to be distorted; and the like.

The thickness of the central portion (non-fixed portion) of the multi-layer type underlay tape 1 is preferably 100 μm or more, and particularly preferably 150 μm or more. Further, it is preferably 500 μm or less, and particularly preferably 350 μm or less.
When the thickness is not more than the above upper limit, distortion is less likely to occur in the butt portion 12, and construction defects (swelling in the vicinity of the butt portion 12) are less likely to occur. Further, when the thickness is at least the above lower limit, the penetration rate can be sufficiently reduced.

In the adhesive portions 1A at both ends of the multi-layer type underlay tape 1, the upper layer film 2 and the lower layer film 3 are adhesively fixed together with the net-like sheet 4 by an adhesive. The adhesives used for adhering and fixing the adhesive portions 1A at both ends include acrylic adhesives, epoxy adhesives, polyurethane adhesives, fluorine adhesives, silicone adhesives, vinyl acetate adhesives, and ethylene acetate. Examples thereof include vinyl-based adhesives and polyvinyl alcohol-based adhesives.

By reducing the adhesive force (adhesive force) of the adhesives on both ends used to bond the adhesive portions 1A on both ends of the multi-layer underlay tape 1 to some extent, the weft threads 4A of the net-like sheet 4 are strongly restrained on both ends. It is not overdone and becomes easier to move when the cutting edge of the blade hits.
Therefore, the cut resistance of the multi-layer underlay tape 1 is improved, and the penetration rate is sufficiently reduced.

Specifically, as an adhesive on both ends, the following test piece X is subjected to an inclined ball tack test specified in JIS Z 0237: 2009 under the conditions of an inclination angle of 30 °, a temperature of 23 ° C, and a relative humidity of 65%. It is preferable to use an adhesive such that the ball number of the test piece X is 13 or less when carried out below (note that in the present specification, when simply referred to as "ball number", measurement is performed under these conditions. The ball number that was given).

[Test piece X]
A low-density polyethylene (LDPE) film Y having a thickness of 20 μm is cut into a width of 15 mm and a length of 300 mm, and 15 g / m ^{2 of the} adhesive on both ends is applied to the entire surface of the film, and a test piece to which the adhesive on both ends is applied. ..

In order to further improve the cut resistance (reduce the penetration rate), the ball number is preferably 12 or less, and particularly preferably 11 or less.

Further, if the adhesive force of the adhesive portions at both ends is too weak, each member (upper layer film 2, lower layer film 3, net-like sheet) constituting the multi-layer type underlay tape 1 when the multi-layer type underlay tape 1 is pulled out after the work. Due to the separation of 4), the fragment of the upper film 2 may remain on the back surface of the wallpaper 11 to which the glue is attached.
Therefore, the lower limit of the ball number is preferably 7 or more, and particularly preferably 9 or more.

The amount of the adhesive used for adhering and fixing the adhesive portions 1A at both ends in a dry state is preferably 5 g or more, and particularly preferably 10 g or more, per 1 m ² of the “multilayer type underlay tape 1”. Further, 30 g or less is preferable, and 25 g or less is particularly preferable.
If it is at least the above lower limit, the multi-layered underlay tape 1 is difficult to separate into each member, so that fragments are less likely to remain on the back surface of the wallpaper 11 after the wallpaper cutting work is completed, and the work efficiency is less likely to decrease. When it is not more than the above upper limit, it is advantageous in terms of cost, the cut resistance is improved, and the penetration rate is sufficiently reduced.

The width of the adhesive portions 1A at both ends of the multi-layer type underlay tape 1 is 2 mm or more and 10 mm or less, respectively.
Further, the width of the adhesive portions 1A at both ends is preferably 2.5 mm or more, and particularly preferably 3 mm or more. Further, it is preferably 10 mm or less, more preferably 8 mm or less, and particularly preferably 7 mm or less.
Within the above range, the adhesive strength of the adhesive portions 1A at both ends tends to be appropriate, and the multi-layer underlay tape 1 is difficult to separate into each member. Further, since the width of the central portion can be sufficiently secured, the builder can easily feel the movement of the weft 4A, and the base material 10 is less likely to be scratched (particularly, continuous linear scratches).

As shown in FIG. 3, the multi-layer type underlay tape 1 of the present invention is used by winding a long product in a roll shape, storing it in a compact state, and cutting it to a length required at a construction site for use. Is desirable.

The upper layer film 2 is a film located on the side of the wallpaper superimposing portion 11A when the multi-layer type underlay tape 1 is used. That is, since the upper layer film 2 is a film that comes into contact with the back surface (that is, the surface with glue) of the wallpaper 11 on the lower side of the wallpaper superposition portion 11A, the upper layer film 2 is hard to transfer the glue (glue It is desirable to configure it so that it is difficult to scrape off.

In the multi-layer underlay tape 1 of the present invention, the material of the upper film 2 is low-density polyethylene (LDPE), high-density polyethylene (HDPE), unstretched polypropylene (CPP), biaxially stretched polypropylene (OPP), ethylene. Examples thereof include polyolefins such as propylene copolymers; polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; polyamides such as nylon 6 and nylon 66; acrylic resins; polyvinyl chloride-based synthetic resins and the like.
Of these, as will be described later, it is optimal to use unstretched polypropylene (CPP) as the upper film 2 from the viewpoint of the balance between flexibility and ease of processing.

The upper layer film 2 preferably has an uneven structure in order to prevent the glue from migrating. By having the uneven structure, it is possible to reduce the amount of glue scraped off from the back surface of the wallpaper 11.
The method of providing the uneven structure on the upper layer film 2 is not particularly limited, and for example, the uneven structure can be provided by a known embossing technique.

Unstretched polypropylene (CPP) tends to form irregularities by embossing, and by forming the upper layer film 2 with unstretched polypropylene (CPP), the glue of the wallpaper 11 is less likely to adhere to the upper layer film 2. By using unstretched polypropylene (CPP) as the material of the upper film 2 and embossing it, the amount of glue scraped can be reduced most, and as a result, workability is improved and the construction state after work is improved. Will also be good.

The average thickness of the upper film 2 (the average thickness in the unembossed state) is preferably 10 μm or more, and particularly preferably 15 μm or more. Further, it is preferably 100 μm or less, and particularly preferably 50 μm or less.
When the thickness is at least the above lower limit, embossing is likely to be performed. When the thickness is not more than the above upper limit, the multi-layer type underlay tape 1 can be made sufficiently thin, the butt portion 12 is less likely to be distorted, and the amount of glue scraped off is reduced. Even if the upper film 2 is thickened beyond the above upper limit, the ease of embossing does not change.

The average apparent thickness of the embossed upper layer film 2 is preferably 50 μm or more, and particularly preferably 100 μm or more. Further, it is preferably 200 μm or less, and particularly preferably 150 μm or less.
When the apparent thickness after embossing is at least the above lower limit, the effect of reducing the amount of glue scraped by providing the embossed portion 2A is likely to be exhibited. When it is not more than the above upper limit, the multi-layer type underlay tape 1 can be sufficiently thinned, the butt portion 12 is less likely to be distorted, and the multi-layer type underlay tape 1 can be easily wound in a long length.

The lower layer film 3 is a film located on the side of the base material 10 at the time of installation. Since the lower layer film 3 does not come into contact with the back surface of the wallpaper 11, it is not necessary to select the lower layer film 3 in consideration of the ease of adhesion of glue. Further, since the lower layer film 3 does not come into contact with the back surface of the wallpaper, it is desirable that the lower layer film 3 is a flat film that has not been particularly processed.

As the material of the lower layer film 3, low density polyethylene (LDPE), high density polyethylene (HDPE), unstretched polypropylene (CPP), biaxially stretched polypropylene (OPP), polyolefins such as ethylene / propylene copolymer; polyethylene terephthalate, Examples thereof include polyesters such as polybutylene terephthalate and polyethylene naphthalate; polyamides such as nylon 6 and nylon 66; acrylic resins; and polyvinyl chloride-based synthetic resins.

Of these, low-density polyethylene (LDPE) and high-density polyethylene (HDPE) are preferable, and low-density polyethylene (LDPE) is particularly preferable because of their flexibility.
Although glue does not adhere to the underlayer film 3, by using a flexible material as the material of the underlayer film 3, flexibility is imparted to the multi-layer underlay tape 1, and the multi-layer underlay tape 1 is removed after cutting. It will be easier to do. That is, as a result of increasing the flexibility of the multi-layer type underlay tape 1, it becomes easy to reduce the amount of glue scraped off from the wallpaper.

Further, when the lower layer film 3 is thin, the cut resistance is generally likely to be lowered (the penetration rate is large), but when low density polyethylene (LDPE) is used as the lower layer film 3, the tensile elastic modulus is low and flexible. Therefore, it is easily deformed when it hits the cutting edge, and the cut resistance can be kept relatively high.
By thinning the underlayer film 3, the flexibility of the multi-layer underlay tape 1 can be increased.

The material of the lower layer film 3 may be the same as or different from the material of the upper layer film 2.
As described above, the upper layer film 2 is selected from the viewpoint of difficulty in adhering glue (both flexibility and ease of embossing), whereas the lower layer film 3 is the flexibility of the film itself. As a result of selection from the above viewpoint, it is preferable that the materials of both films are different.

The average thickness of the underlayer film 3 is preferably 10 μm or more, and particularly preferably 15 μm or more. Further, it is preferably 100 μm or less, and particularly preferably 50 μm or less.
When the thickness is not more than the above upper limit, distortion is less likely to occur in the butt portion 12, and construction defects (swelling near the butt portion 12) are less likely to occur. Further, in order to obtain a film having sufficient strength, the thickness is often less than or equal to the above lower limit.

The net-shaped sheet 4 is composed of a warp 4B substantially parallel to the longitudinal direction of the multi-layer underlay tape 1 and a weft 4A substantially orthogonal to the warp 4B and crossing the multi-layer underlay tape 1 in the width direction.
When the wallpaper 11 is cut with the multi-layer underlay tape 1 laid, the cutting edge of the blade comes into contact with the weft 4A at the center (non-fixed portion) of the multi-layer underlay tape 1, and the weft 4A at the center. Is not constrained by the films on both sides, so it is pulled in the direction of movement of the cutting edge, giving the installer a sense of resistance.

The net-shaped sheet 4 is not particularly limited as long as it is composed of the warp threads 4B and the weft threads 4A. For example, it may be a plain weave or entwined woven fabric, or a warp 4B and a weft 4A may be bonded without weaving.

When the net-shaped sheet 4 is a woven fabric, the intersection 4C of the warp threads 4B and the weft threads 4A may not be sealed or may be sealed.
The method of sealing processing is not particularly limited, and for example, adhesion by applying a sealing agent or heat fusion may be used.

As the sealing agent (adhesive) used for sealing processing, (meth) acrylic adhesive, vinyl acetate adhesive, ethylene vinyl acetate adhesive, (meth) acrylic ethylene vinyl acetate adhesive, polyvinyl An example is an alcohol adhesive.
In addition, "(meth) acrylic" means "acrylic" and / or "methacryl".

When the sealing agent is applied and the sealing process is performed, the mass ratio of the sealing agent in the net-like sheet 4 in the dry state should be 8% by mass or less with respect to the entire net-like sheet 4. It is preferable that the content is 4% by mass or less, more preferably 3% by mass or less, and particularly preferably 3% by mass or less.
By setting the amount of the sealant to be less than or equal to the above upper limit, the weft 4A can be easily moved while being caught on the cutting edge of the blade during cutting, so that a feeling of resistance can be easily transmitted to the operator, and the base material 10 can be used. It becomes easier to prevent the scratches on the surface. Further, if the sealing agent is used in excess of the above upper limit, not only the cost is increased, but also the flexibility of the multi-layer type underlay tape 1 is lowered, and the amount of glue scraped on the back surface of the wallpaper by the upper layer film 2 is likely to increase. Further, the weft 4A becomes difficult to move, and the cut resistance tends to decrease.

Examples of the material of the threads (warp threads 4B and weft threads 4A) constituting the net-like sheet include nylon, vinylon, polyester, polyethylene, polypropylene, acrylic, aramid, polyarylate, polyparaphenylene benzbisoxazole and the like. The materials of the warp 4B and the weft 4A may be the same or different.

Since the weft 4A is pulled by the cutting tool, strength is required, and in order to make it easier to convey a feeling of resistance to the installer, among the above-mentioned materials, high-strength vinylon, ultra-high molecular weight polyethylene, paraaramide, etc. Polyallylate and polyparaphenylene benzbisoxazole are particularly preferred.

Further, the initial tensile elastic modulus of the material constituting the weft 4A is preferably 290 cN / dtex or more, and particularly preferably 700 cN / dtex or more.
If the initial tensile elastic modulus of the material constituting the weft 4A is equal to or higher than the above upper limit, the weft 4A moves a long distance in contact with the cutting edge of the cutting tool, and the resistance to the load of the cutting edge increases. It is presumed that creativity is likely to improve.

The yarn constituting the net-like sheet may be a spun yarn, a monofilament yarn, or a multifilament yarn.
When the weft yarn 4A, which requires strength, is a spun yarn, it is particularly preferable that the weft yarn 4A has a high strength.

In the case of filament yarn, the thickness of the yarn constituting the net-like sheet is preferably 50 denier or more, and particularly preferably 150 denier or more. Further, 700 denier or less is preferable, and 500 denier or less is particularly preferable.
In the case of spun yarn, a cotton count of 7 or more is preferable, and a cotton count of 10 or more is particularly preferable. Further, 100th or lower is preferable, and 50th or lower is particularly preferable.
If it is within the above range, the cut resistance tends to be sufficient. In addition, the thickness of the multi-layer underlay tape 1 can be made sufficiently thin, which facilitates good construction. Further, the feeling of resistance is easily transmitted to the builder at the time of cutting.

In the net-shaped sheet 4, the spacing between adjacent threads (spacing between warp threads 4B and spacing between weft threads 4A) is preferably 1 mm or more, and particularly preferably 2 mm or more. Further, 10 mm or less is preferable, and 7 mm or less is particularly preferable.
When the distance between the adjacent weft 4A and the weft 4A is within the above range, the installer can easily feel the movement of the weft 4A, and the base material 10 is less likely to be scratched (particularly, continuous linear scratches) and is resistant to cutting. Creativity is easy to improve.
Further, regardless of the warp threads 4B and the weft threads 4A, if the distance between adjacent threads is within the above range, the thickness of the multi-layer underlay tape 1 becomes sufficiently thin. Furthermore, the material cost can be suppressed and it is economical.

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

[Making a multi-layered underlay tape]
As shown below, a multi-layered underlay tape (hereinafter, may be simply referred to as "tape") was produced.

<Example 1>
A net-shaped sheet was produced using a polyester spun yarn (Ne30 / 1) as the warp and a pearl lock type pruning spun yarn (Ne10 / 1) of Powerlon (manufactured by Kuraray Co., Ltd., high-strength vinylon) as the weft. The warp threads are installed at 3 mm intervals (8 threads / inch), the weft threads are installed at 3 mm intervals (8 threads / inch), and the intersection of the warp threads and the weft threads is 2 g / m ² with an acrylic sealant in a dry state. Adhered by impregnation.
An unstretched polypropylene (CPP) film with a thickness of 20 μm and a width of 35 mm is embossed as the upper layer film, and a low-density polyethylene (LDPE) film (without embossing) with a thickness of 20 μm and a width of 35 mm is used as the lower layer film. Then, with the net-like sheet sandwiched between the upper layer film and the lower layer film, acrylic adhesive A having a ball number of 3 was applied to each of the 4 mm portions at both ends of both films at 15 g / m ^{2 in} a dry state. The tape T1 was produced by applying and adhering to the above.

<Example 2>
In Example 1, the tape T2 was produced in the same manner as in Example 1 except that the acrylic adhesive C having a ball number of 10 was used instead of the acrylic adhesive A.

<Example 3>
In Example 1, the tape T3 was produced in the same manner as in Example 1 except that the acrylic adhesive D having a ball number of 14 was used instead of the acrylic adhesive A.

<Example 4>
In Example 2, the tape T4 was produced in the same manner as in Example 2 except that the impregnation amount of the acrylic sealant was changed to 10 g / m ² in the dry state.

<Example 5>
In Example 2, a tape T5 was produced in the same manner as in Example 2 except that a nylon spun yarn (Ne22 / 2) was used instead of Powerlon's pearl lock type cut-out spun yarn (Ne10 / 1) as the weft.

<Example 6>
In Example 2, a tape T6 was produced in the same manner as in Example 2 except that Kevlar's spun yarn (Ne20 / 2) was used instead of Powerlon's pearl lock type cut-out spun yarn (Ne10 / 1) as the weft.

<Example 7>
In Example 2, tape T7 was produced in the same manner as in Example 2 except that the low density polyethylene (LDPE) film was changed to a biaxially stretched polypropylene (OPP) film having the same thickness and width.

<Example 8>
In Example 2, tape T8 was produced in the same manner as in Example 2 except that the low density polyethylene (LDPE) film was changed to an unstretched polypropylene (CPP) film having the same thickness and width.

[Measurement of cut resistance]
Using the cut resistance measuring device shown in FIG. 5, a cut resistance measurement test was carried out under the measurement condition A, the penetration rate was calculated, and the evaluation was made according to the following criteria.

5 points: Penetration rate is 0%
4 points: Penetration rate exceeds 0% and less than 25% 3 points: Penetration rate is 25% or more and less than 50% 2 points: Penetration rate is 50% or more and less than 75% 1 point: Penetration rate is 75% or more and less than 100% 0 Point: Penetration rate is 100%

When each tape (tapes T1 to T8) was used, the average value was calculated by measuring 10 times with the same cutting tool. After the measurement 10 times, the cutting tool was replaced with a new one, and the measurement was performed 10 times in the same manner to calculate the average value. This was repeated 5 times in total, and the average value for 3 times excluding the maximum value and the minimum value was calculated and used as the score shown in Table 1.

When the adhesive strength of the adhesives on both ends is too strong (too large) (tape T3) or when a large amount of sealing agent is used (tape T4), the cut resistance is lowered. It is considered that this is because the weft 4A is strongly restrained and becomes difficult to move.

The cut resistance was also reduced when the initial tensile elastic modulus of the material constituting the weft was small (tape T5). It is considered that this is because the distance that the weft moves in contact with the cutting edge of the cutting tool is shortened and the resistance to the load of the cutting edge is reduced.

When the underlayer film was biaxially stretched polypropylene (OPP) or non-stretched polypropylene (CPP) (tapes T7 and T8), the cut resistance was also reduced. It is considered that this is because the film is less likely to be deformed because it has a higher tensile elastic modulus and lower flexibility than LDPE.

On the other hand, when each member, adhesive, etc. constituting the multi-layer type underlay tape is appropriately selected so as not to cause the above-mentioned defects (tapes T1, T2, T6), the multi-layer with high cut resistance A mold underlay tape was obtained.

The multi-layered underlay tape of the present invention is extremely excellent in cut resistance and can prevent construction defects due to excessive force applied during cutting, and thus is used for interior work and the like.

1 Multi-layer underlay tape 1A Adhesive on both ends 2 Upper layer film 2A Embossed part 3 Lower layer film 4 Net-like sheet 4A Weft 4B Warp 4C Intersection 10 Base material 11 Wallpaper (cloth)
11A Wallpaper superposition part 11B Cutting part 12 Butt part T1 Cut resistance measuring device T10 Substrate T11 Cut body fixing means T12 Blade holder T14 Weight holding means T14a Holder part T15 Blade holder Moving means T16 Holding part B Blade B1 Cutting edge S Cut wound

Claims (2)

When the wallpaper is attached to the surface of the base material, the edges of the adjacent wallpaper are overlapped with each other, and when the wallpaper superposition portion is cut, the base material and the wallpaper superposition portion are temporarily overlapped. It is a multi-layered underlay tape that is installed in and protects the base material.
The upper layer film with the net-like sheet sandwiched between the upper layer film located on the side of the wallpaper superposition portion at the time of installation and the lower layer film located on the side of the base material at the time of installation. And the lower layer film are adhesively fixed together with the net-like sheet only at both ends.
The net-like sheet is composed of warp threads substantially parallel to the longitudinal direction of the multi-layer type underlay tape and weft threads substantially orthogonal to the warp threads and crossing the multi-layer type underlay tape in the width direction.
A cut body fixing means for horizontally fixing the cut body to the substrate, a blade holder for holding a blade for cutting the cut body, and a blade holder for lowering the blade holder in a substantially vertical direction. The cutting edge piercing means for contact-loading the cutting edge of the blade so as to pierce the cut body by moving the blade so as to pierce the cut body, and the blade holding body horizontally while contact-loading the cutting edge of the blade with the cut body. When a cut resistance measurement test is carried out under the following measurement condition A using a cut resistance measuring device having a blade holder moving means for moving in a direction, the penetration rate is less than 75%. Multi-layered underlay tape.
<Measurement condition A>
The multi-layered underlay tape is fixed to the cut object fixing means with the upper film facing up, and the cutting edge of the blade is pierced into the multi-layered underlay tape at an angle of 30 °, and a load of 629 gf is applied to the cutting edge. After moving the blade holder horizontally by 14 cm at a speed of 3 m / min, remove it from the incision fixing means, and set the 10 cm part excluding the initial 4 cm as the measurement target area to check for penetration. Observe and let the total value of the penetrating part (excluding the penetrating part having a length less than the weft spacing) be L [cm], and let (L / 10) × 100 be the penetrating rate [%]. The multi-layered underlay tape according to claim 1, wherein no penetration occurs in the measurement target area when the cut resistance measurement test is carried out under the above measurement condition A.

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