JP7214206B2 - corner material - Google Patents

Description

The present invention can be used as a base material for decorative sheets such as wallpaper and cloth at corners constituting external corners or internal corners of walls of buildings, or corners constituting internal corners where ceilings and walls intersect. The present invention relates to a synthetic resin corner material to be attached.

Conventionally, when a decorative sheet such as wallpaper or cloth is pasted on the wall or ceiling of a building, it has been applied to the corners that form external corners or internal corners, or to the corners that form internal corners where the ceiling and wall meet. A long corner material having an L-shaped cross section is joined as a base material for covering unevenness of the corner portion. Such corner materials consist of synthetic resin extrusions, are used for both external and internal corners, and are joined to the corners from the floor to the ceiling by putty materials. Such a corner material has a length of 2500 mm to 4000 mm, a width of about 50 mm, and a thickness of about 0.5 mm.

The corner material has a pair of belt-like portions and a connecting portion connecting the belt-like portions. Each corner part is made of rigid polyvinyl chloride, and the connecting part is made of polyvinyl chloride elastomer, and each band-shaped part is in close contact with the wall surfaces that run almost perpendicularly on both sides of the ridge line or corner part of the corner part. , is configured to be flexibly bendable at the connecting portion.

Each strip of the corner material has a plurality of rows of through holes formed at intervals in the longitudinal direction, and the putty material is prevented from floating on the surface facing the room when attached to the corner of each strip. For this purpose, knurling is performed to form a knurl consisting of a plurality of ridges extending parallel to the longitudinal direction of the corner material (see Patent Documents 1 to 3, for example).

JP 2016-160654 A JP 2017-206874 A JP-A-2016-2572

In the above-described conventional corner material, after the corner material is attached to the corner portion, a decorative sheet such as wallpaper or cloth material is attached. When the corner portion is an external corner portion, the decorative sheet is attached so that the corner material already attached to the corner portion is covered with one continuous decorative sheet. On the other hand, when the corner is an internal corner, work is performed with one decorative sheet attached to the wall surface on one side of the corner or two decorative sheets attached to the wall surfaces on both sides of the corner overlapping each other. On the connecting part of the corner material, the person presses the decorative sheet against the corner with a plate-shaped pressing tool called a ground spatula, and uses a cutting tool called a cutter to cut the decorative sheet on both sides into the corner. The cutting work is done carefully so that the cutting position does not shift so that there will be no gap when it is pasted on the corner.

During such cutting, depending on the material and thickness of the decorative sheet, the work environment, the skill level of the operator, and the like, the cutting edge of the cutting tool may penetrate the decorative sheet and cut even the connecting portion of the corner material. If the connecting portion of the corner material is cut, the part of the decorative sheet attached directly above the connecting portion is likely to float or peel off, and the problem arises that the decorative sheet cannot be reliably attached to the corners. occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a corner member that prevents the connecting portion from being cut when cutting the decorative sheet, and allows the decorative sheet to be reliably stuck up to the corners.

The present invention is a corner material that is used by being attached to a corner portion where two wall surfaces intersect to form an internal corner portion,
a pair of belt-shaped parts made of synthetic resin and extending parallel to each other with one side part spaced apart from each other;
a connecting portion that is made of a synthetic resin softer than the pair of belt-like portions and that connects the one side portions;
provided on one side of one of the pair of strip-shaped portions, projecting from the vicinity of the connecting portion on the surface of the one strip-shaped portion opposite to the surface adhered to the corner portion, and and a ridge extending longitudinally of the strip of
The corner member is characterized in that the ridge portion has a guide groove extending in the longitudinal direction .

Further, according to the present invention, the thickness of the connecting portion is smaller than the thickness of the pair of belt-shaped portions.

Further, the present invention is characterized in that the protrusion height of the ridge portion is 0.1 mm or more and 0.5 mm or less.

Further, the present invention is provided on one side of the other strip of the pair of strips, protrudes from the surface of the other strip on the side opposite to the surface adhered to the corner portion of the other strip, and further comprising a second ridge extending in the longitudinal direction of the strip.

According to the present invention, the corner material used by being attached to a corner portion where two wall surfaces meet to form an internal corner portion or a corner portion where a ceiling and a wall surface meet to form an internal corner portion is made of a synthetic resin, A pair of belt-shaped portions extending parallel to each other with a space therebetween, a connecting portion made of a synthetic resin softer than the pair of belt-shaped portions and connecting the one side portions, and one of the belt-shaped portions. and a protrusion. The ridge protrudes on one side from the surface opposite to the surface attached to the corner of one of the strips and extends in the longitudinal direction of the one strip. Since such a ridge portion is provided on one side portion of one strip portion, after the corner material is attached to the corner portion, a decorative sheet such as wallpaper or cloth is also called a cutter on the connection portion of the corner material. Even if it is cut by a cutting tool, the blade edge of the cutting tool is prevented from reaching the connecting part by the ridges, and the connecting part is prevented from being cut by mistake. can be cut with certainty.

Further, according to the present invention, since the thickness of the connecting portion is smaller than the thickness of each belt-like portion, when the corner material is bent substantially at a right angle when the corner material is attached to the corner portion, each belt-like portion is bent. The corner material can be smoothly bent without interference between the one side portions of the portion, and the mountability can be improved.

Further, according to the present invention, the projection height of the ridges is 0.1 mm or more and 0.5 mm or less. Straightness is obtained by the ridge portion without protruding, and the beauty of the design can be improved.

Further, according to the present invention, on one side of the other belt-shaped portion, the second second projection protrudes from the surface opposite to the surface attached to the corner portion of the other belt-shaped portion and extends in the longitudinal direction of the other belt-shaped portion. Since the ridges are provided, in the state where the corner material is attached to the corners, the area immediately before the connecting portion as seen from the operator is divided into the ridges provided on one belt-shaped portion and the other ridges. Since the gap can be closed with the second ridge provided on the belt-like portion or the gap can be reduced, the problem of the blade edge of the cutting tool inadvertently entering and cutting the connecting portion can be more reliably prevented. can be prevented.

1 is a partial horizontal cross-sectional view showing a state in which a corner member 1 of one embodiment of the present invention is attached to a corner portion C; FIG. 3 is an enlarged cross-sectional view of the corner material 1; FIG. 2 is an enlarged front view of a portion of the corner material 1; FIG. FIG. 2 is a developed front view of a portion of the corner material 1; Fig. 3 is an enlarged cross-sectional view of the vicinity of each one side portion 11a, 11b of each strip-shaped portion 2a, 2b of the corner material 1 in a developed state; 4 is an enlarged cross-sectional view of the vicinity of each one side portion 11a, 11b of each strip portion 2a, 2b of the corner material 1 in a bent state; FIG. It is the horizontal sectional view which expanded each one side part 11a, 11b vicinity of the corner material 1a of other embodiment of this invention. FIG. 11 is a horizontal sectional view enlarging the vicinity of each one side portion 11a, 11b of a corner material 1b according to still another embodiment of the present invention;

FIG. 1 is a partial horizontal cross-sectional view showing a state in which a corner material 1 according to one embodiment of the present invention is attached to a corner portion C, and FIG. 2 is an enlarged cross-sectional view of the corner material 1. As shown in FIG. 3 is an enlarged front view of a part of the corner material 1, and FIG. 4 is a developed front view of a part of the corner material 1. FIG. In addition, FIG. 2 shows a state in which the corner material 1 is divided by the matching line m1. In this specification, the term "corner material" includes not only the final finished product after extrusion molding, but also an unfinished product in the middle of manufacturing before forming through holes, etc., which will be described later.

The corner material 1 of this embodiment is bent at a corner portion C that forms an internal corner where the wall surfaces W11 and W12 of the two walls W1 and W2 in the building intersect at a substantially right angle. It is pasted and used as a base material for the decorative sheet S such as wallpaper or cloth material. The corner member 1 is made of a synthetic resin, and in a flatly developed state as shown in FIG. A pair of belt-like portions 2a and 2b extending in parallel with each other, a connecting portion 3 made of synthetic resin softer than the pair of belt-like portions 2a and 2b and connecting each one side portion, and a pair of belt-like portions 2a and 2b. provided on one side portion 11a of one of the belt-shaped portions 2a, protrudes from the surface 2a2 on the side opposite to the surface 2a1 of the one belt-shaped portion 2a, which is attached to one wall surface W11 of the corner portion C, and ridges 4a extending in a direction perpendicular to the page of FIG. 1, which is the longitudinal direction of the portion 2a.

The other belt-shaped portion 2b has a surface 2b1 attached to the other wall surface W12 of the corner portion C and a surface 2b2 opposite to the surface 2b1. No protrusion is provided on the surface 2b2 of 11b. According to such a configuration, if the corner material 1 has a length that is less than the distance from the floor to the ceiling of the corner portion C, for example, when using a standard corner material 1 with a length of 1700 mm, one piece is used as it is. , another one is cut to the remaining length from the floor to the ceiling, and the two corner members 1 can be pasted on the corner portion C by aligning the directions so that the ridges 4a are aligned.

The corner portion C constituting the internal corner portion of the walls W1 and W2 is made of gypsum board, structural plywood having moisture absorption or moisture permeability, ordinary plywood, medium density fiberboard (abbreviated as MDF), hardboard, and insulation. It is realized by wooden boards such as ration boards and particle boards, or volcanic vitreous multi-layer boards.

Each strip-shaped portion 2a, 2b and connecting portion 3 can be made of the same kind of resin material, such as vinyl chloride (PVC). The resin material forming each strip-shaped portion 2a, 2b and connecting portion 3 contains a plasticizer. Plasticizers include dioctyl phthalate (DOP), dibutyl phthalate (DBP), diethyl phthalate (DEP), dicapryl phthalate (DCP), diisodecyl phthalate (DIDP), dinonyl phthalate (DNP), and octyl phthalate. Known ones such as decyl (ODP), butyl benzyl phthalate (BBP), butyl phthalyl butyl glycolate (BPBG), and butyl lauryl phthalate (BLP) can be used.

Regarding the material of each band-shaped part 2a, 2b, the case of using a hard vinyl chloride resin was described in this embodiment, but if there is no problem with bending strength and moldability, styrene resin or polyethylene may be used as necessary. A base resin (PET) can also be suitably employed. Styrene-based resins include polystyrene resins, impact-resistant polystyrene resins, ABS resins, AES resins, ASA resins, and the like. The connection part 3 may use a soft vinyl chloride resin, or may use another resin. The bendable soft resin has at least one of a durometer hardness of D30 or more and D70 or less, a bending strength of 25 cN or more and 200 cN or less, and a stress at 50% strain of 5 MPa or more and 25 MPa or less. may be

The putty material P having good adhesiveness to the corner portion C, the corner material 1 and the decorative sheet S can be selected and used. As the decorative sheet S, a non-breathable cloth material such as an airtight vinyl cloth obtained by laminating a resin film on the back side of a paper sheet or a cloth sheet can be used.

In each band-shaped portion 2a, 2b of the corner material 1, a plurality of rows of through holes 13a, 13b are formed in four rows with a predetermined interval in the longitudinal direction. In this embodiment, the through-holes 13a and 13b have an inner diameter D of 4 mm, and are formed with an interval ΔL2 in the longitudinal direction and an interval ΔL3 in the width direction. The longitudinal interval ΔL2 is, for example, 3 mm, and the widthwise interval ΔL3 is, for example, 5 mm. By forming such through-holes 13a and 13b in each of the band-shaped portions 2a and 2b, the weight reduction rate due to the through-holes 13a and 13b in each of the band-shaped portions 2a and 2b is 5 to 20% in terms of weight per unit length. can be reduced and transportation costs can be reduced.

Double-faced tapes 14a and 14b are attached to the surfaces 2a1 and 2b1 of the strip portions 2a and 2b of the corner material 1 from the vicinity of the other side portions 12a and 12b to the one side portions 11a and 11b. As a result, it is possible not only to temporarily fasten the corner material 1 to the corner portion C, but also to prevent deformation of the other side portions 12a and 12b of the band-shaped portions 2a and 2b, which is also called "wavy". can. In this embodiment, the width of the double-sided tapes 14a, 14b may be 8 to 25 mm, preferably 18 mm, or the width of the strips 2a, 2b may be 8 mm to 25 mm, preferably 18 mm, so as to effectively prevent waviness of the strips 2a, 2b. It may be configured to be 30-80% of the width, preferably 70% or more.

FIG. 5A is an enlarged cross-sectional view of the vicinity of each one side portion 11a, 11b of each strip-shaped portion 2a, 2b of the corner material 1 in the unfolded state, and FIG. It is an expanded sectional view near one side part 11a, 11b. Referring also to FIG. 2, the thickness T11 of the side portions 11a and 11b on the connecting portion 3 side is 0.4 to 1.0 mm, preferably 0.6 mm. Further, the thickness T12 of the other side portions 12a and 12b of each strip portion 2a and 2b is set to 0.15 to 0.5 mm, preferably 0.3 mm. The minimum thickness T2, which is the thickness of the connecting portion 3, is smaller than the thickness T11 of the side portions 11a, 11b of each strip portion 2a, 2b, and is selected to be 0.2 to 0.5 mm, for example.

According to such a configuration, the corner material 1 is made of synthetic resin, and each of the one side portions 11a and 11b extends in parallel with the pair of belt-shaped portions 2a and 2b that are spaced apart from each other by an interval ΔL1. It is made of a synthetic resin softer than 2b, and has a connecting portion 3 that connects the one side portions 11a and 11b, and a ridge portion 4a that is provided on one belt-like portion 2a. In one side portion 11a, the ridge portion 4a protrudes from the vicinity of the connecting portion 3 of the surface 2a2 opposite to the surface 2a1 attached to the corner portion C of the one belt-shaped portion 2a, and extends in the longitudinal direction of the one belt-shaped portion 2a. extends to Since such a ridge portion 4a is provided on one side portion 11a of one strip portion 2a, after the corner material 1 is attached to the corner portion C, the decorative sheet S such as wallpaper or cloth is connected to the corner material 1. Even if cutting is performed on the portion 3 by the cutter blade M of the cutting tool, the cutting edge of the cutter blade M is prevented from entering by the ridge portion 4a, and the connection portion 3 is prevented from being cut by mistake. can be reliably cut at corners. Further, by setting the thickness T2 of the connecting portion 3 to be smaller than the thickness T11 of each of the strip portions 2a and 2b, there is an effect that the thin connecting portion 3 can be easily bent due to the concentration of stress on the thin connecting portion 3 during bending. can. Furthermore, when the corner material 1 is bent substantially at a right angle during installation, the one side portions 11a and 11b do not interfere with each other, and the step between the thin connecting portion 3 and the one side portions 11a and 11b is alleviated. Also, due to the improved rigidity provided by the ridges 4a, the corner material 1 does not bend and becomes more likely to stand on its own during installation, thereby improving the ease of installation.

The connecting portion 3 includes a base portion 3c interposed between the side portions 11a and 11b, and a thin film portion 3a extending from the base portion 3c to the sides of the surfaces 2b1 and 2a1 in the width direction (horizontal direction in FIG. 5A) over widths L3a and L3b. , 3b. Each width L3a, L3b is, for example, approximately 2 mm. Each thin film portion 3a, 3b has a thickness T3 of, for example, 0.05 mm, and is integrated with one side portion 11a, 11b of each strip portion 2a, 2b by extrusion molding. In such a connection portion 3, not only the base portion 3c but also the thin film portions 3a and 3b on both sides are brought into contact with the respective one side portions 11a and 11b of the strip portions 2a and 2b to be integrally joined. 3 and each belt-like portion 2a, 2b are integrated and joined with high joint strength.

The ridge portion 4a has a height H in a direction perpendicular to the surface 2a1, a width B in a direction parallel to the surface 2a1, and a cross-sectional shape perpendicular to the plane of FIG. 5A that is a right triangle. Since the protrusion height H of the ridges 4a is selected to be 0.1 mm or more and 0.5 mm or less, the decorative sheet attached from the wall surface or the ceiling to the corner material is supported by the ridges 4a and does not protrude excessively. The linearity of the ridges 4a can be obtained without the ridges 4a, and the beauty of the design can be improved.

In addition, since the height H of the ridge portion 4a is selected to be 0.1 mm or more and 0.5 mm or less, the ridge portion 4a is provided with appropriate rigidity for inserting the cutter blade M. can be prevented.

Next, an example of a method for manufacturing the corner material 1 will be described for reference. Raw materials such as thermoplastic resin pellets are supplied to an extruder, melted, and transferred from the extruder to a mold heated by a heating device. be guided. The molded product of the corner material 1 from the mold is cooled by a cooling device, and the cooled molded product of the corner material 1 is guided to a double-sided tape applying device, and temporarily fixed to the corner material 1 by the double-sided tape applying device during construction. Double-faced tapes 14a and 14b are attached for this purpose. After that, the molded product of the corner material 1 is guided to a punching device and punched to form the through holes 13a and 13b. The corner material 1 having the through holes 13a and 13b formed thereon is removed by a take-up device for slack and warp, and cut to a predetermined constant length by a standard length cutting device to obtain a product. The corner material 1 of the present embodiment may be manufactured in this manner.

The connecting portion 3 has a width ΔL1 of 1.0 mm and a thickness T2 that is smaller than the strip portions 2a and 2b. This thickness T2 is, for example, 0.4 mm. The connecting portion 3 has thin film portions 3a and 3b that are integrated by cutting into the front surfaces 2a2 and 2b2 from the back surfaces 2a1 and 2b1 of the strip portions 2a and 2b by a thickness T3. The width (=L3a+ΔL1+L3b) of thin film portion 3a is, for example, 5.0 mm, and the thickness T3 is, for example, 0.05 mm. With such a thin film portion 3a, when the belt-like portions 2a and 2b are bent in a mountain fold so that the connecting portion 3 protrudes outward, the tensile stress generated in the connecting portion 3 is reduced by the respective belt-like portions 2a and 2b. , the stress concentration in the connecting portion 3 is alleviated, and the connecting force between the belt-like portions 2a and 2b is increased. In addition, when the corner material 1 is bent, a tensile stress is generated in the surface portion 31 of the connecting portion 3 that is joined to the wall surfaces W11 and W12, and a compressive stress is generated in the surface portion 32 on the opposite side of the room. A surface portion 32 is arranged on the side facing the cutting edge of the cutter blade M when cutting the decorative sheet S, and the vicinity of this surface portion 32 is harder than the surface portion 31 on the back side due to the compressive force, and the cutting edge of the cutter blade M temporarily contacts or hits. Even if they come into contact with each other, deep cuts are prevented, and large damage does not occur.

Further, in this embodiment, the double-sided tapes 14a, 14b are thinner than the ends of the band-shaped portions 2a, 2b and have a thickness of 0.15 mm, preferably 0.05 to 0.2 mm. Even if the strip portions 2a and 2b are lifted from the wall surfaces W11 and W12 of the corner portion C by the thickness of 14b, a large level difference is generated between the tip portions of the strip portions 2a and 2b and the wall surfaces W11 and W12. never.

Furthermore, after sticking the double-sided tapes 14a, 14b to the strip portions 2a, 2b so that the double-sided tapes 14a, 14b do not block the through holes 13a, 13b of the strip portions 2a, 2b, the through holes of the strip portions 2a, 2b are removed. By performing the punching process for forming 13a and 13b, it is possible not only to reduce the weight, but also to maintain the anchoring effect of applying the putty material P to the through holes 13a and 13b. Bonding strength can be obtained.

Next, a method of attaching the corner member 1 to the corner portion C will be described. First, the corner material 1 is brought into contact with the inner corner of the corner portion C of the wall so as to face the corner material 1 in a convex posture, and the double-faced tapes 14a and 14b are attached to the respective wall surfaces W11 and W12. is temporarily attached to the corner portion C. After that, the putty material P is applied on the wall surfaces W11, W12 and the corner material 1, and the corner material 1 is fixed to the corner portion C so as not to cause a step.

In this embodiment, a plurality of knurls 16a, 16b extending in the longitudinal direction are formed in order to roughen the surfaces 2a2, 2b2 of the strip portions 2a, 2b. By forming such knurls 16a and 16b, when the putty material is moved in one direction or the other by the operator's operation of the work tool during the putty application work, the putty material is positioned downstream in the moving direction. A portion of the putty material is blocked by the unevenness of the knurls 16a and 16b, and a flow is generated in a direction opposite to the moving direction, thereby improving the adhesion of the putty material P to the corner material 1. FIG.

In addition, in this embodiment, since a large number of through holes 13a and 13b are formed in the band-shaped portions 2a and 2b of the corner material 1, the putty material P is applied to the through holes 13a and 13b when the putty is applied. P enters and contacts each wall surface W11, W12. As a result, the wall surfaces W11 and W12 of the putty material P and the corner material 1 are joined with high joint strength, and the corner material 1 can be prevented from lifting and peeling off.

FIG. 6 is an enlarged horizontal cross-sectional view of the vicinity of each one side portion 11a, 11b of the corner member 1a of another embodiment of the present invention. In addition, the same reference numerals are given to the parts corresponding to the above-described embodiment. In the above-described embodiment, the protrusion 4a has a triangular cross section perpendicular to the longitudinal direction of the protrusion 4a. Alternatively, a ridge portion 4a having a guide groove 19 that opens on the oblique side of a triangular cross section may be formed. Such a guide groove 19 prevents the cutting edge of the cutter blade M from being inadvertently shifted in the lateral direction, cuts only the decorative sheet S in a straight line, and prevents the connecting portion 3 from being cut. can be prevented.

FIG. 7 is an enlarged horizontal cross-sectional view of the vicinity of each one side portion 11a, 11b of the corner member 1b of still another embodiment of the present invention. In addition, the same reference numerals are given to the parts corresponding to the above-described embodiment. The corner material 1b of the present embodiment is formed with ridges 4a and 4b on one side 11a and 11b of each of the strips 2a and 2b. 2b extending parallel to the longitudinal direction. When the corner member 1b is bent substantially at a right angle, the tips of the projections 4a and 4b are elastically deformed by coming into contact with each other so as not to create a gap where the connecting portion 3 is exposed to the front. . As a result, the cutting edge of the cutter blade M is prevented from being inserted or pierced toward the connecting portion 3, and damage to the connecting portion 3 can be prevented more reliably.

As described above, in this embodiment, in addition to the above-described one ridge portion 4a, one side portion 11b of the other strip portion 2b is also provided with a surface opposite to the surface 2b1 attached to the corner portion C of the other strip portion 2b. A second ridge portion 4b is provided that protrudes from the side surface 2b2 and extends in the longitudinal direction of the other strip portion 2b. As a result, in the state where the corner material 1b is attached to the corner portion C, the region immediately before the front side of the connecting portion 3 as viewed from the operator is divided into the ridge portion 4a provided on one strip portion 2a and the strip portion 4a on the other strip portion. The second protrusion 4b provided in the portion 2b closes the gap or reduces the gap to prevent the cutting edge of the cutter blade M, which is a cutting tool, from accidentally entering and cutting the connecting portion 3. can be reliably prevented.

As still another embodiment of the present invention, the cross-sectional shape of each of the ridges 4a and 4b is not limited to the above-described triangular shape, and may be other cross-sectional shapes such as a quadrangle, a quarter circle, or a trapezoid. may

1, 1a, 1b corner material 2a, 2b strip-shaped portion 2a1, 2b1; 13b through hole 14a, 14b double-sided tape C corner portion P putty material S decorative sheet W1, W2 wall W11, W12 wall surface

Claims (4)

A corner material that is used by being attached to a corner portion where two wall surfaces intersect to form an internal corner portion,
a pair of belt-shaped parts made of synthetic resin and extending parallel to each other with one side part spaced apart from each other;
a connecting portion that is made of a synthetic resin softer than the pair of belt-like portions and that connects the one side portions;
provided on one side of one of the pair of strip-shaped portions, projecting from the vicinity of the connecting portion on the surface of the one strip-shaped portion opposite to the surface adhered to the corner portion, and and a ridge extending longitudinally of the strip of
A corner member , wherein the ridge portion has a guide groove extending in the longitudinal direction . 2. The corner material according to claim 1, wherein the thickness of the connecting portion is smaller than the thickness of the pair of belt-shaped portions. 3. The corner material according to claim 1, wherein the protruding height of the ridge portion is 0.1 mm or more and 0.5 mm or less. provided on one side of the other of the pair of strips, protrudes from the surface of the other strip that is opposite to the surface that is attached to the corner, and extends along the length of the other strip 4. The corner material according to any one of claims 1 to 3, further comprising a second ridge portion extending in a direction.

Images