JP3182090B2 - Edge-processed sheet and processing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet subjected to edge processing and a method for processing the same, and more particularly, to a reinforcing portion enclosing a rope, and connecting the reinforcing portion and the substrate sheet to a peripheral portion of the substrate sheet. The present invention relates to a sheet subjected to edge processing in which a connecting portion to be joined and a joining portion for joining an edge sheet and a base sheet are formed, and a method of processing the sheet.

[0002]

2. Description of the Related Art Conventionally, the edge processing of a synthetic resin sheet such as a curing sheet for construction work, a civil engineering sheet, a leisure sheet, etc. is performed by folding an end portion of the sheet, enclosing a rope, and then sewing or sewing a folded back portion. A method of joining by heat welding is widely used. By the way, when the sewing machine is sewn as shown in FIG. 3A, the tensile strength of the sheet at the seam portion 9 of the sewing machine is significantly reduced. For example, when a polyethylene laminated sheet was sewn with a sewing machine, a decrease in tensile strength of up to about 30% was observed. In addition, problems have been pointed out, such as an increase in cost due to the use of a sewing thread, a low productivity of sewing of the sewing machine, and a time and effort for removing the sewing thread during sheet regeneration. In the case of joining by heat welding, the above problem was solved. However, in the case of a thick sheet as shown in FIG. 3B, the folded end portion 10 is bulky and generates a repulsive force against the folding. It was difficult to perform edge processing for accurately overlapping and welding. Also, since the folded thickness becomes extremely thick, the appearance of the sheet is deteriorated, the product value is reduced, the package appearance when stacking and transporting products is not stable, and the storage efficiency of storing is poor, etc. There was also.

[0003] A sheet in which a reinforcing portion is provided by enclosing a rope in a peripheral portion by edge processing as described above, as shown in FIG.
A method is widely used in which a plurality of pipes having a C-shaped cross section 18 are connected in the vertical and horizontal directions by using a joint 11 joined back to back and used as a sheet of a predetermined size. Since the reinforcing portion enclosing the rope is bulky, it has been difficult to smoothly perform the operation of connecting the sheet by fitting the pipe into the pipe having the C-shaped cross section 18. When the thick sheet includes a foam, the reinforcing portion formed by folding the foam and enclosing the rope is formed by partially compressing the folded foam in the pipe having the C-shaped cross section 18. There is also a problem that it is difficult to maintain a firm connection state because it is ubiquitous in a pipe having a C-shaped cross section 18.

[0004] Further, even for a hard synthetic resin sheet which is difficult to be folded or a rubber sheet which is too soft to form a hard edge, suitable edge processing and connecting means formed by edge processing are required. It was requested to be attached.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is to provide a reinforcing portion enclosing a rope formed without being bulky at a peripheral portion of a base sheet, a reinforcing portion and a base sheet. Processing, which forms a connecting portion for connecting the base sheet and a joining portion for joining the base sheet and the edge sheet, and has an edge processing having a firm and excellent appearance and a connecting means formed by the edge processing. And a method for processing the sheet.

[0006]

According to a first aspect of the present invention, a rope 3 is formed by bending an edge sheet 2 around the periphery of a base sheet 1.
Part 4 enclosing the reinforcing member, the reinforcing part 4 and the base sheet 1
Between the inner surface of the edge sheet 2 and the outer surface of the base sheet 1 by hot air welding. A sheet having a welded joint 6 formed therein, and having a C-shaped cross section
Resin joints with pipes 18 joined back to back
The reinforcement part 4 is fitted to the pipe using the int 11
The gist is a sheet which has been subjected to edge processing so that a plurality of sheets can be connected . A second invention of the present application is a reinforcing section 4 in which a rope 3 is sealed by folding a sheet end extended portion 8 constituting the base sheet 1 around the peripheral edge of the base sheet 1; A connecting portion 5 located between the base member 1 and the base sheet 1 and formed by hot welding the inner surfaces of the extension portions 8 to each other by hot air welding, and hot air welding between the inner surface of the extension portions 8 and the outer surface of the base sheet 1 A pipe having a C-shaped section 18 which is a sheet formed by forming a joint portion 6 which is heat-welded by a method.
Using the resin joint 11 joined back to back,
A plurality of sheets are formed by fitting the reinforcing portion 4 to the pipe.
The gist is a sheet that has been subjected to edge processing to enable connection . The third invention of the present application is a reinforcing part 4 formed by bending the edge sheet 2 and enclosing the rope 3 at the peripheral edge of the base sheet 1.
A connecting portion 5 located between the reinforcing portion 4 and the base sheet 1 and formed by heat welding the inner surfaces of the edge sheet 2 to each other by hot air welding; In the processing of a sheet which has been subjected to edge processing by forming a joint portion 6 in which the outer surface of the sheet 1 is thermally welded to the outer surface of the sheet 1 by a hot air welding method, a multi-stage press roller 16b used in the hot air welding method is coaxial and has a different diameter. It is a roll, wherein the diameter R1 of the roll portion pressing the connecting portion 5 is larger than the diameter R2 of the roll portion pressing the joining portion 6, and the welding of the connecting portion 5 and the joining portion 6 is performed simultaneously. The gist is a method of processing a sheet subjected to edge processing. A fourth invention of the present application is a reinforcing section 4 in which a rope 3 is sealed by folding a sheet end extended portion 8 constituting the base sheet 1 around the periphery of the base sheet 1, and the reinforcing section. A connecting portion 5 located between the base member 1 and the base sheet 1 and formed by heat-welding the inner surfaces of the extended portions 8 to each other by hot-air welding.
And a crimping roll 16b used in the hot-air welding method in the processing of the edge-finished sheet in which the joining portion 6 is formed by hot-welding the inner surface of the extension portion 8 and the outer surface of the base sheet 1 to each other. Is a multi-stage roll which is coaxial and has different diameters. The diameter R1 of the roll portion pressing the connecting portion 5 is larger than the diameter R2 of the roll portion pressing the joining portion 6, so that the connecting portion 5 and the joining portion 6 A method for processing a sheet subjected to edge processing, characterized in that the welding is performed simultaneously.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Base sheet 1 used in the present invention
Examples thereof include a synthetic resin sheet, a rubber sheet, a woven or knitted fabric or nonwoven fabric made of synthetic fibers, a synthetic woven or knitted fabric or nonwoven fabric made of synthetic fibers, or a laminate thereof. Specifically, polyethylene sheet, polypropylene sheet, styrene butadiene rubber sheet,
Single-layer sheets such as styrene-butadiene rubber foam sheet, polyethylene foam sheet, polyurethane foam sheet, polyethylene flat yarn cloth, polyethylene flat yarn cloth laminate sheet, laminate of polyurethane foam sheet and polyethylene flat yarn cloth laminate sheet, polyethylene foam sheet And a laminated sheet of a polyethylene flat yarn cloth laminate sheet and the like. Among these, a laminate of a polyurethane foam sheet and a polyethylene flat yarn cloth laminate sheet, a laminate of a polyethylene foam sheet and a polyethylene flat yarn cloth laminate sheet, which can be thermally welded, are preferably used.

The thickness of the base sheet 1 is not particularly limited, but the method of the present invention is particularly effective for a relatively thick one, specifically, 2 mm or more.
More effective is a sheet of 4 mm or more, and even more effective is a sheet of 8 mm or more.

The edge sheet 2 used in the present invention includes:
It is necessary to have high strength and capable of heat-sealing, and a fiber base made of various fiber materials coated with a thermoplastic resin composition is preferably employed.

As the thermoplastic resin composition, those having moldability at relatively low temperatures, heat sealing properties, and sealing strength are suitable. Linear low density polyethylene, low density polyethylene, and ethylene-vinyl acetate are preferred. In addition to polyolefins such as polymers, ethylene-acrylate copolymers, and low-melting point polypropylenes, polymers such as polyvinyl chloride, polystyrene, polyester, polyamide, and polyvinyl alcohol can be given.

As the laminating method for laminating the resin coating layer on the fiber base material, known methods such as an extrusion laminating method, a dry laminating method, and a thermocompression laminating method can be adopted.
Among these, the extrusion lamination method having excellent adhesive strength is preferable. Although the thickness of the laminate coating layer can be arbitrarily set, it is preferably 30 to 150 μm in order to maintain the strength of the connecting means by edge processing, and 50 to 1 μm.
More preferably, it is 20 μm.

The rope 3 used in the present invention is made of natural fibers,
Strings or ropes made of synthetic fibers or the like are used, but are not particularly limited. However, the base sheet 1
The rope 3 is compressed and the C-shaped section 18 is compressed when the pipe having the C-shaped section 18 is fitted to the connecting means using the joint 11 joined back to back. It is important that the reinforcing portion 4 has an appropriate hardness such that it does not deviate from the opening of the pipe.

In the present invention, as a method for forming the connecting portion 5 and the joining portion 6, any joining method such as a method using an adhesive, a method using an adhesive tape, and a heat welding method can be adopted. The thermal welding method is preferred from the viewpoint of easiness and productivity. As the heat welding method, a known method such as a high-frequency welding method, an ultrasonic welding method, or a hot air welding method can be adopted, but the inner surfaces of the folded edge sheets 2 or the inner surfaces of the edge sheets 2 and the outer surfaces of the base sheet 1 are bonded together. As a method for hot welding, a hot air welding method is preferable.

As a method of performing the edge processing by the hot-air welding method, a step of thermally welding the edge sheet 2 will be described with reference to FIG. First, as shown in FIG.
And one end of the edge sheet 2 are thermally welded. Next, as shown in FIG. 6 (b), the other end of the heat-sealed edge sheet 2 is bent, the rope 3 is disposed at the bent portion, and hot air is blown and welded as indicated by arrow A. Heat the spot where it should be. Then, FIG.
As shown in (c), a pair of pressure rolls 16a, 16b
To weld the connecting portion 5 and the joining portion 6 by heat. At this time, it is important that the diameter R1 of the roll portion pressing the connecting portion 5 of the pressure-bonding roll 16b is larger than the diameter R2 of the roll portion pressing the joining portion 6. FIG. 7 shows that the pressing rolls are the conventional pressing rolls 17a and 17b.
As shown in (2), it is impossible to press the connecting portion 5, air cannot be discharged from the connecting portion 5, and welding is insufficient and unstable.

The shape of the edge processed portion formed in this manner is preferably such that the reinforcing portion 4 formed by enclosing the rope 3 is tightly enclosed so that the rope 3 and the edge sheet 2 do not shift. The thickness of 3 is based on the reinforcing strength required for the base sheet 1 and usually has a diameter of about 2 to 10 mm. The width of the connecting portion 5 formed by heat welding depends on the size of the base sheet 1, but is usually about 5 to 30 mm. The width of the joint 6 depends on the load applied to the base sheet 1, Usually, it is about 30 to 100 mm.

FIG. 1 shows an enlarged cross section of an edge portion of the sheet subjected to the edge processing. The edge processing shown in FIG. 1 is configured using an edge sheet 2 which is a separate member. However, as shown in FIG. In forming the edge of the material sheet 1, at least one layer of the laminate can be extended from the base sheet, and the sheet end extension 8 can be used in place of the edge sheet 2 described above. That is, the extension portion 8 formed by extending at least one layer of the laminate constituting the base sheet 1
Is folded back at a predetermined length to enclose the rope 3, and the end of the extended portion 8 is brought to a position where it comes into contact with the sheet base material. Next, the welding process is performed with the above-described pressure roll, and the reinforcing portion 4, the connecting portion 5, and the joining portion 6 constitute an edge portion of the sheet.

The thus obtained sheet subjected to edge processing is connected to a plurality of sheets in the vertical and horizontal directions using a joint 11 in which pipes having a C-shaped cross section 18 are joined back to back as shown in FIG. can do. As shown in FIG. 8B, the sheet subjected to the edge processing has a C-shaped cross section 1.
The reinforcing part 4 in which the rope 3 is sealed is fitted to the pipe having the pipe 8 and connected. The joint 11 may be anything as long as it can form a pipe having a C-shaped cross section 18, and a resin injection molded product, a compression molded product, a modified extrusion molded product, or the like is used.

As a connecting means provided by edge processing, as shown in FIG. 11, a known method of arranging eyelets 19 at predetermined intervals on the connecting portion 5 and connecting the eyelets 19 with a rope or the like using the eyelets 19 is used. Can be adopted.

Examples of the use of the sheet subjected to edge processing by the method of the present invention include:
As illustrated in FIG. 10, it is large, about 1.8 m in length × about 5.1 m in width, and is subjected to edge processing on each peripheral edge thereof, and is used as a joint 11 having a pipe having a C-shaped cross section 18. It is done.

[0020]

EXAMPLE Using a high-density polyethylene (MFR = 1.0), a film was formed by an inflation method, slit, and stretched to form a flat yarn having a fineness of 900 denier. The flat yarn was used as warp yarns to obtain a flat woven flat yarn cloth 14a having a woven density of 10 × 10 yarns / inch. This flat yarn cloth 14a
, Low-density polyethylene (MFR = 8.0) layer 1
A polyethylene flat yarn cloth laminate sheet 13a was formed by laminating 5a with a thickness of 30 μm by an extrusion coating method. Next, as a foamed sheet, a polyethylene foamed sheet 12 (# 410, manufactured by JSP Corporation) having a foam density of 50 kg / m ³ and a thickness of 4 mm was prepared. On both sides of the polyethylene foam sheet 12, the cross face of the polyethylene flat yarn cloth laminate sheet 13a is aligned with the face of the polyethylene foam sheet 12 to form an adhesive layer by extrusion coating.
μm-thick low-density polyethylene (MFR = 8.0) layer 1
5b was provided and laminated. Thus, the 30 μm low-density polyethylene layer 15a / the flat yarn cloth 14a / 20
A 1760 mm wide base sheet 1 composed of 7 layers of μm low density polyethylene 15b / 4 mm polyethylene foam sheet 12/20 μm low density polyethylene 15b / flat yarn cloth 14a / 30 μm low density polyethylene 15a was obtained (see FIG. 4). ).

Next, high density polyethylene (MFR = 1.
Using 0), a film was formed by an inflation method, then slit and stretched to form a flat yarn having a fineness of 950 denier. The flat yarn was used as a warp yarn to obtain a plain woven flat yarn cloth 14b having a woven density of 14 × 14 yarns / inch. On both sides of the flat yarn cloth 14b, low-density polyethylene (MFR = 8.
The polyethylene flat yarn cross-laminated sheet 13b obtained by laminating 0) was formed by extrusion coating to a thickness of 50 μm, and this was cut into a width of 130 mm to form an edge sheet 2. As a reinforcement rope for edge processing, a high-density polyethylene monofilament with a single twist of 9 m in diameter
An mφ rope 3 was prepared.

The base sheet 1 was cut into a length of 5418 mm, and the edge sheet 2 was cut into the periphery of the base sheet 1 using a hot air center sealing machine manufactured by Japan High Frequency Co., Ltd. as shown in FIG. Welded to the part. Next, the rope 3 is arranged at the center of the edge sheet 2 and the edge sheet 2 is bent, and as shown in FIG. 6 (b), hot air having a temperature of 295 ° C. is sent into the folded edge sheet 2. Next, as shown in FIG. 6C, the joining portion 6 and the connecting portion 5 were joined by pressing with the pressure rolls 16a and 16b, and the edge-processed sheet 7 was manufactured. In the press roll 16b, the diameter R1 of the portion pressing the connecting portion 5 is larger than the diameter R2 of the portion pressing the joining portion 6. When pressed by the normal pressure rolls 17a and 17b, as shown in FIG. 7, the joint 6 is pressed and pressed,
This is because the connecting portion 5 is not sufficiently joined because it is not pressed. The obtained sheet 7 subjected to edge processing was a sheet having a width of 1,820 mm and a length of 5,478 mm, as shown in FIG.

The sheet 7 thus obtained, which has been subjected to edge processing, is cut into a length of 300 mm and a width of 300 mm.
A pull-out test of the joint 11 when fitted to the joint 11 made of low-density polyethylene as shown in (a) and connected as shown in FIG. 8 (b) was performed by the method shown in FIG. Tensile load 20 when a load is applied in the vertical direction
At 0 kgf, there was no abnormality such as damage to one part of the base material sheet, peeling of the joint part 6, cutting of the connecting part 5, detachment of the reinforcing part 4 enclosing the rope 3 from the joint 11, breakage of the joint 11, and the like. As a result, a sheet 7 subjected to edge processing with a strength suitable for use as an on-site curing sheet was obtained.

[0024]

As described above, according to the present invention, the reinforcing portion 4 is formed on the peripheral portion of the base sheet 1 by thermal processing using a heat-fusible sheet member. The effect of suppressing the partial decrease in the tensile strength of the conventional method, lowering the productivity in the conventional processing method, and saving time and effort in sheet regeneration can be obtained. Further, there is also an effect of improving workability when the base sheet 1 is thick, improving the appearance of edge processing, and improving commercial value. Further, by providing the reinforcing portion 4 in which the rope 3 is sealed at the peripheral portion by edge processing, a firm connection can be achieved using the joint 11 in which pipes having the C-shaped cross section 18 are joined back to back. In addition, suitable edge processing can be performed on a hard synthetic resin sheet that is difficult to be folded or a rubber sheet that is too soft to form a hard edge.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an edge portion of a sheet subjected to edge processing according to the present invention.

FIG. 2 is a schematic cross-sectional view of another embodiment of the edge portion of the edge-treated sheet of the present invention.

FIG. 3 is a schematic cross-sectional view of a conventional edge-finished sheet.

FIG. 4 is a schematic sectional view of a base sheet according to the present embodiment.

FIG. 5 is a schematic sectional view of the edge tape in the present embodiment.

FIG. 6 is an explanatory diagram of an operation showing a step of edge processing in the present embodiment.

FIG. 7 is an explanatory view in the case of pressing with a conventional pressure roll.

FIG. 8 is a diagram showing a state in which a sheet subjected to edge processing of the present invention is fitted to a joint of a sheet and both sides of the joint.

FIG. 9 is an explanatory diagram of a pull-out test in a state where the edge-finished sheet of the present invention is fitted to a joint.

FIG. 10 is a plan view of an embodiment of a sheet subjected to edge processing according to the present invention.

FIG. 11 is an explanatory view of a state in which a connecting means is formed at a connecting portion of a sheet subjected to edge processing according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Base sheet 2 Edge sheet 3 Rope 4 Reinforcement part 5 Connection part 6 Joining part 7 Edge-finished sheet 8 One-layer extended part which constitutes base material sheet 9 Sewing part of sewing machine 10 End part which turned up thick sheet 11 Joint 12 Foam sheet 13a, 13b Flat yarn cloth laminate sheet 14a, 14b Flat yarn cloth 15a Outer layer of base sheet 15b Adhesive layer of base sheet 15c Laminate layer of edge sheet 16a, 16b Crimping roll 17a, 17b used in the present invention Conventional press roll 18 Pipe having C-shaped cross section 19 Eyelet

Claims (4)

(57) [Claims] 1. A reinforcing portion 4 formed by folding an edge sheet 2 and enclosing a rope 3 at a peripheral portion of a base sheet 1; and a reinforcing portion 4 located between the reinforcing portion 4 and the base sheet 1. A connecting portion 5 is formed by hot welding the inner surfaces of the sheets 2 to each other by a hot air welding method, and a joining portion 6 is formed by hot welding the inner surface of the bent edge sheet 2 and the outer surface of the base sheet 1 to each other. With a sheet
A pipe having a C-shaped section 18 is connected back to back.
Using the combined resin joint 11,
The reinforcing portion 4 is fitted so that a plurality of sheets can be connected.
A sheet that has been subjected to edge processing. 2. A reinforcing portion 4 in which a rope 3 is sealed by folding back one sheet end extending portion 8 constituting the base material sheet 1 around a peripheral edge portion of the base material sheet 1, and the reinforcing portion 4 A connecting portion 5 located between the base material sheet 1 and the inner surfaces of the extension portions 8 formed by heat welding the inner surfaces of the extension portions 8 to each other, and the inner surface of the extension portions 8 and the outer surface of the base sheet 1 are heated by the hot air welding method. A sheet having a welded joint 6 formed therein , the C-shaped section 1
Resin joy jointed with pipes having 8
The reinforcing part 4 is fitted to the pipe by using
And make it possible to connect multiple sheets.
Sheet which has been subjected to edge processing to be. 3. A reinforcing portion 4 formed by folding the edge sheet 2 and enclosing a rope 3 at a peripheral portion of the base sheet 1; and a reinforcing portion 4 located between the reinforcing portion 4 and the base sheet 1. A connecting portion 5 is formed by hot welding the inner surfaces of the sheets 2 to each other by a hot air welding method, and a joining portion 6 is formed by hot welding the inner surface of the bent edge sheet 2 and the outer surface of the base sheet 1 to each other. In the processing of the sheet subjected to the edge processing, the pressure roll 16b used in the hot air welding method is a multi-stage roll having different diameters coaxially, and the diameter R1 of the roll portion pressing the connecting portion 5 is equal to the joining portion 6 A joint portion 5 and a joining portion 6 are simultaneously welded by making the diameter larger than a diameter R2 of a roll portion for pressing the sheet. 4. A reinforcing portion 4 in which a rope 3 is sealed by folding back one sheet end extended portion 8 constituting the base material sheet 1 around the peripheral edge portion of the base material sheet 1, and the reinforcing portion 4 A connecting portion 5 located between the base material sheet 1 and the inner surfaces of the extension portions 8 formed by heat welding the inner surfaces of the extension portions 8 to each other, and the inner surface of the extension portions 8 and the outer surface of the base sheet 1 are heated by the hot air welding method. In the processing of the edge-finished sheet formed by forming the welded joints 6, the pressure roll 16b used in the hot-air welding method includes:
This is a multi-stage roll which is coaxial and has a different diameter. The diameter R1 of the roll portion pressing the connecting portion 5 is larger than the diameter R2 of the roll portion pressing the joining portion 6, so that the connecting portion 5 and the joining portion 6 are welded. The method for processing a sheet subjected to edge processing, wherein the method is performed simultaneously.