JPH09242341A - Sheet for construction work and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the durability of a sheet for construction works by forming bonding sections in parallel on both sides of a bushing fixing section formed in the longitudinal direction of the folding-down section of a heat bonding sheet and driving a bushing to the bushing fixing section. SOLUTION: A heat bonding sheet 1, in which a polymer having high frequency or thermal fusing properties is attached on a knitted woven fabric consisting of synthetic-resin yarn strips, is folded back, and a folding-down section 2 is formed. Bonding sections 4, 4' under the state, in which the folding- down sections 2 are thermally treated and the heat bonding sheets 1 are bonded mutually on both sides of bushing fixing sections 3 under the state to be mutually bonded, are formed in parallel. Ropes 6 for reinforcing consisting of polypropylene are inserted into folding-back end sections, and bushings 5 are driven to the bushing fixing sections 3 at regular intervals. Accordingly, the bushings 5 are caulked tightly to the heat bonding sheets 1 and are not loosened, and the durability of a sheet A for construction works can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction sheet and a construction sheet used for the purpose of preventing materials from falling and preventing dust and the like generated during construction from scattering around at a construction site or a civil engineering construction site. The manufacturing method is related.

[0002]

2. Description of the Related Art A work sheet of this type is one in which four ends of a sheet serving as a base material are folded back, and eyelets are formed on the folded portions to attach to a structure.
When the construction sheet is erected, ropes are attached to the eyelets to secure it to the scaffolding at the construction site.Therefore, when exposed to strong wind during use, the folded portion of the construction sheet bends or extends through the eyelets. Such stress concentrates, and there is a problem that the eyelets come off and the folded portion is damaged.

Therefore, in order to strengthen the folded-back portion, Japanese Utility Model Publication No. 52-11396 proposes a sheet for construction work in which a reinforcing material is built into the folded-back portion of the construction sheet and an eyelet is provided at this portion. Has been done. However, in order to incorporate the reinforcing material in the folded-back portion, the procurement of the reinforcing material and the manufacturing process thereof are complicated, so that the manufacturing cost is disadvantageously increased.

On the other hand, in Japanese Unexamined Patent Publication No. 58-31164, high-frequency or heat-sealing treatment is applied to a folded portion of a sheet to which a polymer having high-frequency or heat-sealing property is attached to form an eyelet portion. After that, the eyelet portion of the coarse sheet in which the eyelet is placed on the eyelet portion is disclosed.

However, the eyelet portion formed by heat-sealing the entire folded portion of the sheet as disclosed in Japanese Patent Laid-Open No. 58-31164 is, as shown in FIGS. Since the entire abutting portion b of the sheet a is heat-sealed, the entire abutting portion b is thin and flat, so that the eyelets c are hard to adhere to each other, and the eyelet c is not firmly fixed to the abutting portion b. There is a problem that the eyelet c is loosened, the eyelet c spins idle, the yarns forming the sheet a are worn and the eyelet c comes off, and the sheet a is damaged from the portion of the eyelet c.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and eyelets to be placed on the folded portion of the construction sheet are firmly fixed, and have high strength and durability. An object is to provide an excellent construction sheet and a highly productive manufacturing method.

[0007]

In order to achieve the above-mentioned object, the construction sheet of the invention described in claim 1 is a knitted fabric made of synthetic fiber yarn, which is made of a polymer having a high-frequency or heat-fusion property. An end portion of the heat-adhesive sheet formed by adhering is folded back to form a folded overlap portion, and the eyelet fixing portion where the heat-adhesive sheets are not adhered to each other in the longitudinal direction of the folding portion and both sides of the eyelet fixing portion. It is characterized in that the heat-adhesive sheet is formed in parallel with an adhesive portion to which the sheets are welded, and an eyelet is driven in the eyelet fixing portion. It is preferable that a reinforcing rope is provided inside the folded end of the folded portion of the heat-adhesive sheet (claim 2). It is preferable that the width of the eyelet fixing portion is formed so as to be substantially the same as the outer diameter of the eyelet to be placed (claim 3). It is effective that the knitted woven fabric made of synthetic fiber yarns is a coarse woven fabric using polyester synthetic fiber yarns as a background and the polymer having high frequency or heat fusion property is polyvinyl chloride synthetic resin. (Claim 4).

According to a fifth aspect of the present invention, there is provided a method for manufacturing a construction sheet, wherein an end portion of a heat-adhesive sheet is formed by adhering a high frequency or heat-fusible polymer to a knit fabric made of synthetic fiber yarn. To form a folded portion, and by supplying the folded portion between a pair or a plurality of pairs of rolls provided with grooved rolls and applying heat and pressure, the heat-adhesive sheets are mutually aligned in the longitudinal direction of the folded portion. The present invention is characterized in that after forming an adhesive portion in which the heat-adhesive sheets are welded to each other on both sides of the non-adhesive eyelet fixing portion, the eyelets are driven in the eyelet fixing portion. When the end portion of the heat-adhesive sheet is folded back to form the folded portion, it is preferable to interpose a reinforcing rope at the folded end portion of the folded portion (claim 6). It is preferable that the thermal adhesive sheets are welded to each other by blowing hot air between the folded portion of the thermal adhesive sheet and the grooved roll (claim 7). It is effective to circulate cooling water inside the grooved roll to cool the grooved roll, thereby welding the heat-adhesive sheets together and cooling the adhesive portion (claim 8).

According to the present invention, in the folded portion of the heat-adhesive sheet, the heat-adhesive sheets form eyelet fixing portions which are not adhered to each other between the adhering portions where the heat-adhesive sheets are welded to each other. Therefore, when the eyelet is cast on the eyelet fixing portion, the eyelet is firmly crimped to the heat-adhesive sheet,
It does not loosen or spin during use, prevents the yarn around the eyelet from being worn or damaged, and improves the durability of the construction sheet. In addition, the eyelet fixing portion has no decrease in strength because the yarns constituting the construction sheet have not been subjected to heat treatment, and further, the two heat-adhesive sheets that have been overlapped act independently on the external force. The tear strength is improved as compared with the case where the entire surface is bonded.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is a plan view showing a construction sheet A according to an embodiment of the present invention. The construction sheet A is formed by folding back an end portion of a heat-adhesive sheet 1 described later to form a folded-over portion 2 and subjecting the folded-over portion 2 to heat treatment, so that the thermal-adhesive sheet 1 is formed as shown in FIG. Are formed in parallel on both sides of the eyelet fixing portion 3 in which the heat-adhesive sheets 1 are adhered to each other, and the eyelets 5 are arranged at predetermined intervals in the eyelet fixing portion 3. It is constructed by placing. A reinforcing rope 6 made of polypropylene is inserted inside the folded end portion 2a of the folded portion 2.

The heat-adhesive sheet 1 is a woven fabric (warp density of 26 yarns / 25.4 mm, weft density of 27 yarns / 2) woven by using polyester filament yarn (250d / 48f) for warp and weft.
Polyvinyl chloride resin adhered to 5.4 mm) 75 g / m
It was created by coating so as to be ² , and a so-called coarse sheet is formed.

As shown in FIGS. 3 and 4, the folded portion 2 of the heat-bonded sheet 1 is formed to have a width of 40 mm, and the bonded portion 4 having a width of 3 mm is bonded by welding a polyvinyl chloride resin.
And a width of 2 mm between the adhesive portion 4'formed to have a width of 12 mm.
A 2.5 mm non-adhered eyelet fixing portion 3 is formed. The eyelet 5 is provided with a metal fitting having an inner diameter of 10 mm and an outer diameter of 19 mm.

In the step of heat-treating the folded portion 2, the folded portion 2 of the heat-bonding sheet 1 is supplied to the heat treatment apparatus M as shown in FIG. 5, and the space between the grooved roll 7 and the rubber roll 8 is fed. It is carried out by passing hot air from a nozzle 9 provided between the grooved roll 7 and the rubber roll 8 while passing the air.

The heat treatment apparatus M is configured such that the pair of grooved rolls 7 and rubber rolls 8 and the plurality of pairs of flat rolls 10 and rubber rolls 8 convey the folded portion 2 of the thermal adhesive sheet 1 in the arrow direction. Although not shown in the drawings, the grooved roll 7 and the flat roll 10 are driven by the power of a motor or the like, so that the folded-over portion 2 of the thermal adhesive sheet 1 is continuously transferred.

As shown in FIG. 6, the grooved roll 7 is a metal roll, and a groove portion 7b is provided on the surface between the pressing portions 7a and 7a '. The width of the pressing portion 7a corresponds to the width of the adhesive portion 4, and the width of the groove portion 7b is set to correspond to the width of the eyelet fixing portion 3. In addition, water is circulated inside for cooling. The rubber roll 8 is a smooth cylindrical roll having a rubber layer formed on the surface thereof. The flat roll 10 is a metal roll having a smooth surface, and like the grooved roll 7, water is circulated inside to cool the heat-bonding sheet 1.

The nozzle 9 is composed of the adhesive portions 4, 4'of the folding portion 2.
2 are provided for each of them, and each of them is a thermal adhesive sheet 1
Hot air is ejected between the fold and the folded portion 2.
In the lower heat-bonding sheet 1 and the folded portion 2, the polyvinyl chloride resin on the surface is melted by the hot air ejected from the nozzle 9, and the pressure is applied between the grooved roll 7 and the rubber roll 8 to form the upper and lower heat-bonding sheets 1. Are welded to each other, and are pressed and cooled by the pressing portions 7a and 7a 'of the grooved roll 7 being cooled, so that the adhesive portions 4 and 4'are formed as shown in FIG. In the groove portion 7b of the grooved roll 7, since the heat-adhesive sheets 1 are not heated and pressed with each other, the eyelet fixing portion 3 in a non-adhered state is formed without being adhered.

FIG. 8 is a front view showing a grooved roll 11 according to another embodiment of the present invention. Grooved roll 11
Is the pressing portions 11a, 11 as in the grooved roll 7.
Although a'is provided, the surface of the wide pressing portion 11a 'is knurled. Since the grooved roll 11 has the knurled pressing portion 11a ′,
There is an advantage that the folded portion 2 of the heat-bonding sheet 1 is reliably pressed and a stronger adhesive portion can be obtained.

[0018]

According to the construction sheet of the present invention, in the folded portion of the heat-adhesive sheet, the eyelet fixing portions where the heat-adhesive sheets are not adhered to each other are provided between the adhering portions where the heat-adhesive sheets are welded to each other. Since the eyelet is formed, when the eyelet is driven in the eyelet fixing portion, the eyelet is firmly crimped to the heat-adhesive sheet, and does not loosen or idle during use, and the yarn around the eyelet is not worn or damaged. It is prevented and the durability of the construction sheet is improved. Further, in the eyelet fixing portion, since the two heat-adhesive sheets that are superposed independently act on the external force, there are many advantages such as improved tear strength and enhanced eyelet holding force. Furthermore, according to the manufacturing method of the present invention, since the heat welding treatment is performed using the grooved roll, it is possible to efficiently manufacture the eyelet fixing portion and the adhesive portion,
There are many advantages such as the ability to manufacture highly durable construction sheets at low cost.

[Brief description of drawings]

FIG. 1 is a plan view showing a construction sheet according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line YY of FIG. 1;

FIG. 4 is an enlarged plan view showing a portion of the construction sheet of FIG. 1 in which eyelets are placed.

5 is an explanatory view showing the structure of an apparatus for manufacturing the construction sheet of FIG.

6 is a front view showing the grooved roll of FIG. 5. FIG.

FIG. 7 is a front view showing a state in which the folded portion of the heat adhesive sheet is pressed by the grooved roll and the rubber roll of FIG.

FIG. 8 is a front view showing a grooved roll according to another embodiment of the present invention.

FIG. 9 is a plan view showing a conventional construction sheet.

10 is a sectional view taken along line P-P in FIG.

11 is a sectional view taken along line QQ of FIG.

[Explanation of symbols]

 A Work sheet 1 Thermal adhesive sheet 2 Folded part 3 Eyelet fixing part 4, 4'Adhesive part 5 Eyelet 6 Reinforcing rope 7 Grooved roll

Claims (8)

[Claims] 1. A fold-over portion is formed by folding back an end portion of a heat-adhesive sheet obtained by adhering a polymer having a high frequency or a heat-fusible property to a knitted fabric made of synthetic fiber yarn, and the fold-over portion is formed. In the longitudinal direction, the eyelet fixing portions where the heat-adhesive sheets are not adhered to each other and the adhesive portions where the heat-adhesive sheets are welded to each other are formed in parallel on both sides of the eyelet fixing portions, and the eyelets are attached to the eyelet fixing portions. Construction sheet characterized by being installed. 2. The reinforcing rope is internally provided at the folded back end of the folded portion of the heat-adhesive sheet.
The described construction sheet. 3. The construction sheet according to claim 1 or 2, wherein the width of the eyelet fixing portion is formed to have a width substantially equal to the outer diameter of the eyelet to be placed. 4. A knitted woven fabric comprising synthetic fiber yarns is a coarse woven fabric using polyester-based synthetic fiber yarns as a background.
The polymer having a high-frequency or heat-melting property is a polyvinyl chloride-based synthetic resin, claim 1, claim 2
Alternatively, the construction sheet according to claim 3. 5. A grooved roll is provided by folding back an end of a heat-adhesive sheet obtained by adhering a high-frequency or heat-fusible polymer to a knitted fabric made of synthetic fiber yarn to form a folded overlap portion. By supplying the folded portion between one or more pairs of rolls and applying heat and pressure, the heat-adhesive sheets in the longitudinal direction of the folded portion have heat-adhesiveness on both sides with non-adhesive eyelet fixing portions sandwiched therebetween. A method for manufacturing a construction sheet, comprising forming an adhesive portion where the sheets are welded to each other and then placing an eyelet on the eyelet fixing portion. 6. The construction according to claim 5, wherein when the end portion of the heat-bondable sheet is folded back to form a folded portion, a reinforcing rope is provided at the folded end portion of the folded portion. Sheet manufacturing method. 7. The heat-adhesive sheets are welded to each other by blowing hot air between the folded portion of the heat-adhesive sheet and the grooved roll. Manufacturing method for construction sheets. 8. The grooved roll is circulated to cool the grooved roll to cool the grooved roll, thereby welding the heat-adhesive sheets together and cooling the adhesive portion. A method for manufacturing a construction sheet according to claim 6 or 7.