JP2022136268A - Sheet and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet which is hard to deform when rolled into a rolled shape, and a method for manufacturing the same.

SOLUTION: There is provided a method for manufacturing a sheet, which comprises the steps of: manufacturing a plurality of resin sheets (excluding foam sheets) having a thickness t₁ of 0.1 to 5 mm by molding a thermoplastic resin into sheets by extrusion molding or inflation molding; and integrating end portions of the plurality of resin sheets in a width direction so that a thickness t₂ of an integrated portion is adjusted into 90% or more and 115% or less of the thickness t₁ while sending out and traveling the plurality of resin sheets to obtain one sheet. The method of integrating the end portions of the plurality of resin sheets is a method of melting and crimping the end portions of each of the plurality of resin sheets, and integrating the plurality of resin sheets by traveling the sheets in a state of separating end surfaces of each resin sheet by 3 mm or less, or in a state of the end surfaces of the resin sheets being in contact with each other.

SELECTED DRAWING: None

COPYRIGHT: (C)2022,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a sheet in which a plurality of resin sheets are integrated and a manufacturing method thereof.

When manufacturing a wide sheet, the width of the resin sheet to be manufactured is limited by a general molding method, so the resin sheets are joined together.
In Patent Documents 1 to 3, as a method for joining resin sheets, two thermoplastic resin sheets are continuously conveyed by an endless belt-shaped body in a state where the ends in the width direction are overlapped, and the ends are joined. A method of heating and melting the overlapping portions and crimping is described.

Japanese Patent No. 5244645 Japanese Patent No. 5346561 Japanese Patent No. 5581407

However, the sheets obtained by the methods described in Patent Documents 1 to 3 have a problem that the sheets are deformed when rolled into a roll because the thickness of the joint portion is locally increased.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sheet that is less likely to be deformed when rolled into a roll, and a method for producing the same.

The present invention has the following aspects.
<1> A step of manufacturing a plurality of resin sheets having a thickness t ₁ of 0.1 to 5 mm;
While sending out and running the plurality of resin sheets, the ends of the plurality of resin sheets in the width direction are joined _together so that the thickness t2 of the integrated portion is 90% or more and 115% or _less of the thickness t1. a step of integrating into one sheet so as to be
A method of manufacturing a sheet, comprising:
<2> The method for producing a sheet according to <1>, wherein the method for integrating the ends of the plurality of resin sheets is a method of melting and crimping the ends of the plurality of resin sheets.
<3> The method for producing a sheet according to <1>, wherein the method of integrating the ends of the plurality of resin sheets is a method of melting the ends and welding rods of the plurality of resin sheets and crimping them. .
<4> Manufacture of the sheet of <2> above, wherein the plurality of resin sheets are integrated by running with the end surfaces of the resin sheets spaced apart by 3 mm or less, or with the end surfaces of the resin sheets in contact with each other. Method.
<5> The sheet manufacturing method according to <4>, wherein distances between end faces of the plurality of resin sheets are detected during running, and feeding positions of the plurality of resin sheets are controlled based on the detected distances.
<6> A sheet having at least one bendable portion extending in the longitudinal direction.
<7> The sheet according to <6>, wherein the tensile elastic modulus of the easily bendable portion is 80% or more and 98% or less of the tensile elastic modulus of the other portion.

According to the sheet manufacturing method of the present invention, it is possible to manufacture a sheet that does not easily deform when wound into a roll.
The sheet of the present invention is less likely to be deformed when wound into a roll.

1 is a perspective view showing a schematic configuration of a sheet integrating apparatus used in a sheet manufacturing method according to an embodiment; FIG. FIG. 2 is a side view showing a welding unit and a detection mechanism that constitute the sheet integrating device shown in FIG. 1; 2 is a flowchart for explaining an example of an edge controller that constitutes the sheet unifying device shown in FIG. 1;

It should be noted that the following definitions of terms apply throughout the specification and claims.
"Machine Direction" is the machine direction or longitudinal direction in which the sheet is manufactured.
"A portion where the ends of a plurality of resin sheets are integrated" (hereinafter also referred to as an "integrated portion") is a portion where a plurality of resin sheets are integrated and another portion (for example, each resin The central portion of the sheet) indicates a portion having different physical properties (tensile modulus, etc.).
"~" indicating a numerical range means that the numerical values before and after it are included as lower and upper limits.

The sheet manufacturing method of the present invention includes the following first step and second step.
First step: a step of manufacturing a plurality of resin sheets having a thickness t ₁ of 1 to 2 mm.
Second step: A step of unifying the ends of the plurality of resin sheets in the width direction to form one sheet while sending out and running the plurality of resin sheets.

(First step)
Examples of the resin that constitutes each of the plurality of resin sheets manufactured in the first step include thermoplastic resins. The thermoplastic resin may be a crystalline resin (eg, polyvinyl chloride, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyvinyl acetate, polytetrafluoroethylene, polyethylene terephthalate, etc.), or an amorphous resin. It may be a flexible resin (for example, polystyrene, etc.).
The resin forming each of the plurality of resin sheets may be the same or different, and is typically the same resin.

The thickness t ₁ of the resin sheet is 0.1 to 5 mm, preferably 0.4 to 2 mm. If the thickness t1 is 0.1 _mm or more, it is possible to have practical strength, and it is difficult for holes to open during sheet manufacturing and laying. If the thickness t1 is ₅ mm or less, the resin sheet or the sheet obtained by integrating a plurality of resin sheets can be easily wound up, and workability is good.
The thickness t1 of _each of the plurality of resin sheets is approximately the same. That the thickness t1 is substantially the same means that the thickness is ₉₀ % or more and 115% or less of the original thickness. The original thickness is the target value when manufacturing the resin sheet in the first step, and the target value of the thickness of each of the plurality of resin sheets is the same.

A method for manufacturing the plurality of resin sheets is not particularly limited, and may be the same as a method for manufacturing a known resin sheet. For example, when the resin constituting the resin sheet is a thermoplastic resin, that is, when the resin sheet is a thermoplastic resin sheet, the thermoplastic resin is molded into a sheet by a molding method such as an extrusion molding method or an inflation molding method. A resin sheet is thus obtained. In the extrusion molding method, for example, a thermoplastic resin is melted in an extruder equipped with a T-die, and the melted thermoplastic resin is continuously extruded through the T-die and cooled to obtain a resin sheet.

In the first step, a plurality of resin sheets may be separately molded, or a long resin sheet is molded with one extruder, and the obtained long resin sheet is divided into a plurality of resin sheets. may be obtained.
Each of the plurality of resin sheets may be wound up as a wound product and then subjected to the second step, or may be directly subjected to the second step without being wound up.
When the resin sheet is used as a roll and then subjected to the second step, in the second step, the roll is opened when the resin sheet is sent out.

The first step and the second step can be continuously performed by continuously producing the resin sheet in the first step and directly subjecting the obtained resin sheet to the second step without being wound up.
The resin sheets that are continuously produced and directly subjected to the second step may be all or part of the plurality of resin sheets. For example, in the first step, all of the plurality of resin sheets can be continuously produced by using a plurality of extruders or the like, and the produced plurality of resin sheets can be directly subjected to the second step. For example, in the first step, part of the plurality of resin sheets can be rolled and then subjected to the second step, and the remaining resin sheets can be continuously produced and directly subjected to the second step.

(Second step)
In the second step, the ends of the plurality of resin sheets in the width direction are integrated.
The integration is performed so that the thickness t2 of the integrated portion is 90% or _more and 115% or _less of the thickness t1 of the resin sheet. Since the sheet thus obtained has a substantially uniform thickness as a whole, it is difficult to deform when rolled into a roll. In addition, the strength of the integrated portion is also good.
_The thickness t2 of the integrated portion is preferably 95% or more and _less than 105% of the thickness t1.

The second step will be described below by taking as an example the case of integrating the ends of a plurality of resin sheets in the width direction using the sheet integrating apparatus 100 shown in FIGS.

<Sheet integration device>
FIG. 1 is a perspective view showing a schematic configuration of a sheet integrating apparatus 100. As shown in FIG. FIG. 2 is a side view showing a welding unit and a detection mechanism that constitute the sheet unifying device 100. As shown in FIG.
The sheet unifying apparatus 100 runs three thermoplastic resin sheets 1, 2, 3 (resin sheets) arranged in a direction orthogonal to the flow direction, and moves the thermoplastic resin sheets 1, 2, 3, respectively. The thermoplastic resin sheets 1, 2 and 3 are integrated by melting and crimping the ends in the width direction (direction orthogonal to the flow direction) of the sheets. A sheet 4 having two integrated portions 4a extending along the flow direction (the running direction of the thermoplastic resin sheet) is obtained by the sheet integrating apparatus 100. FIG.
Three extruders (not shown) are provided on the upstream side of the sheet integrating apparatus 100, and the thermoplastic resin sheets 1, 2, and 3 are continuously produced by the respective extruders, and the sheet integrating apparatus It is designed to supply 100.

The sheet integrating apparatus 100 includes two sets of welding units 10, two sets of detection mechanisms 20 provided on the upstream side of each welding unit 10, and a feeding unit 30 provided on the upstream side of each detection mechanism 20. , and a winding unit 40 provided downstream of each welding unit 10 .
Two sets of welding units 10 are arranged side by side in a direction perpendicular to the flow direction. One welding unit 10 of the two sets of welding units 10 integrates one end of the thermoplastic resin sheet 1 and one end of the thermoplastic resin sheet 2 . The other welding unit 10 joins the other end of the thermoplastic resin sheet 2 and one end of the thermoplastic resin sheet.
Although not shown, each of the thermoplastic resin sheets 1, 2 and 3 runs on a support stand.

The welding unit 10 has welders 10a and 10b arranged vertically. Thermoplastic resin sheets 1, 2 and 3 run between the welding machines 10a and 10b. Hereinafter, the upper welder 10a will be referred to as the first welder 10a, and the lower welder 10b will be referred to as the second welder 10b. The first welder 10a and the second welder 10b are biased by a spring or the like so as to come into close contact with each other.

The first welding machine 10a and the second welding machine 10b each have a conveying means 11, a first heating means 12, a second heating means 13, a pressing roll 14, and a cooling means 15. As shown in FIG.
The conveying means 11 includes an endless belt 11a that contacts the ends of the thermoplastic resin sheets (the ends of the thermoplastic resin sheets 1 and 2 or the ends of the thermoplastic resin sheets 2 and 3), and the belt 11a that rotates. , and a plurality of rolls 11b for bending the running direction of the belt 11a. The roll 11b in this embodiment is rotationally driven by driving means such as a motor. The belt 11a is rotated by the rotationally driven roll 11b so as to correspond to the running of the thermoplastic resin sheet.

A first heating means 12, a second heating means 13, a pressing roll 14, and a cooling means 15 are provided in this order from the upstream side inside the portion of the belt 11a that contacts the thermoplastic resin sheet. there is
The first heating means 12 of the first welding machine 10a and the first heating means 12 of the second welding machine 10b, the second heating means 13 of the first welding machine 10a and the second heating means 13 of the second welding machine 10b The two heating means 13, the cooling means 15 of the first welding machine 10a and the cooling means 15 of the second welding machine 10b face each other. The pressing roll 14 of the first welding machine 10a and the pressing roll 14 of the second welding machine 10b are arranged so as to pinch and compress the end of the thermoplastic resin sheet.

Examples of the first heating means 12 and the second heating means 13 include a heating body, a heating machine that heats with hot air, infrared rays, or the like. In this embodiment, since the first heating means 12 and the second heating means 13 are arranged inside the belt 11a, they do not directly heat the edge of the thermoplastic resin sheet. The heat of the first heating means 12 and the second heating means 13 is transmitted to the edge of the thermoplastic resin sheet through the belt 11a.

When the edges of the thermoplastic resin sheets running between the welding machines 10a and 10b do not overlap, that is, when the edges of the thermoplastic resin sheets are separated from each other, or when the edges of the thermoplastic resin sheets are in contact with each other In this state, the width of the first heating means 12 and the second heating means 13 is set to (the thermoplastic resin sheet to be integrated (distance between end surfaces of thermoplastic resin sheets + 10 mm) or more, and more preferably (distance between end surfaces of thermoplastic resin sheets to be integrated + 20 mm) or more.
In addition, from the viewpoint of ensuring sufficient strength of the integrated portion 4a and suppressing the consumption of heating energy, the width of the first heating means 12 and the second heating means 13 is determined by the width of the thermoplastic resin sheet to be integrated The distance between the end faces + 50 mm) or less is preferable, and the distance between the end faces of the thermoplastic resin sheets to be integrated + 40 mm) or less is more preferable.

The width of the pressing roll 14 is such that the entire portion melted by the first heating means 12 and the second heating means 13 can be compressed and the integrated portion 4a can be flattened. It is preferably equal to or greater than the width of the heating means 13 . Moreover, the width of the pressing roll 14 is preferably substantially the same as the width of the first heating means 12 and the second heating means 13 because the welding unit 10 can be made compact.
Here, when the width of the first heating means 12 and the width of the second heating means 13 are different, the widths of the first heating means 12 and the second heating means 13 are equal to the width of the first heating means 12. and the width of the second heating means 13, the wider one. The same applies hereinafter.
The width of the pressing roll 14 can be regarded as the width of the integrated portion 4a.

Examples of the cooling means 15 include a cooling body and a cooler that cools with cold air. Since the cooling means 15 of this embodiment is arranged inside the belt 11a, it does not directly cool the thermoplastic resin sheet.
The width of the cooling means 15 is preferably equal to or greater than the width of the first heating means 12 and the second heating means 13 in order to sufficiently cool the entire melted portion. More preferably, it is 1.3 times or more the width of the second heating means 13 .
Further, the width of the cooling means 15 is twice the width of the first heating means 12 and the second heating means 13 in order to reduce the size of the welding unit 10 and to suppress the consumption of cooling energy. It is preferably 1.6 times or less, more preferably 1.6 times or less.

As the welding unit 10, for example, an open arm type hot plate type continuous welding machine LHP-W708-OA manufactured by Quinlight Denshi Seiko Co., Ltd. can be used.

The detection mechanism 20 has a laser beam irradiation section 21 and a sensor 22 . The sensor 22 is roll-shaped. The laser light irradiation section 21 and the sensor 22 are vertically opposed to each other, and the thermoplastic resin sheets 1, 2 and 3 pass between the laser light irradiation section 21 and the sensor 22. As shown in FIG.
The laser beam irradiation unit 21 is arranged on the upstream side of the second welding machine 10b. The laser light irradiation unit 21 irradiates the sensor 22 with laser light.
The sensor 22 is arranged upstream of the first welder 10a. The sensor 22 detects the laser beam emitted from the laser beam irradiation unit 21 and determines the distance between the end faces of the thermoplastic resin sheets 1, 2 or 2, 3. When the thermoplastic resin sheets 1, 2 or 2, 3 are run with the end faces separated or in contact with each other, the wider the distance between the end faces, the less laser light is blocked by the thermoplastic sheet. the amount of received light increases. Therefore, the relationship between the amount of light received, the distance between the end surfaces, and the amount of light received is obtained in advance and input to the sensor 22, so that the distance between the end surfaces can be determined from the amount of light received.
The sensors 22 of the two sets of detection mechanisms 20 are electrically connected to edge controllers (not shown) of the first guide roll 31 and the third guide roll 33 of the feeding unit 30, respectively. Data detected by the sensor 22 (the distance between the end faces of the thermoplastic resin sheet during travel) is output to the edge controller.
The position of the sensor 22 is preferably as close to the welding unit 10 as possible. The distance between the sensor 22 and the welding unit 10 is preferably 0-20 cm, more preferably 0-10 cm.

The feeding unit 30 is for feeding the thermoplastic resin sheets 1 , 2 , 3 to the welding unit 10 . The feeding unit 30 in this embodiment has a first guide roll 31 , a second guide roll 32 and a third guide roll 33 .
The first guide roll 31, the second guide roll 32 and the third guide roll 33 feed the thermoplastic resin sheets 1, 2 and 3 supplied from the extruder arranged upstream to the welding unit 10, respectively. It is to deliver.
The first guide rolls 31, the second guide rolls 32 and the third guide rolls 33 are each arranged so that the width direction is along the direction perpendicular to the flow direction.

The first guide roll 31 and the third guide roll 33 are each provided with an edge controller (EPC) (not shown). The edge controller is electrically connected to the sensor 22 and receives data output from the sensor 22 .
The edge controller controls the position of the first guide roll 31 or the third guide roll 33 in the direction perpendicular to the machine direction, thereby controlling the feed position of the thermoplastic resin sheet 1 or 3. control mechanism.
The edge controller controls the feeding position of the thermoplastic resin sheet 1 or 3 based on the data from the sensor 22, ie the distance between the end faces of the thermoplastic resin sheet during running.
For example, when the distance between the end surfaces detected by the sensor 22 is wider than the preset distance, the first guide roll 31 or the third guide roll 33 is moved toward the second guide roll 32, The distance between the end face of the thermoplastic resin sheet 1 or 3 and the end face of the thermoplastic resin sheet 2 is narrowed.
For example, when the distance between the end surfaces detected by the sensor 22 is narrower than the preset distance, the first guide roll 31 or the third guide roll 33 is moved to the side opposite to the second guide roll 32 side. By moving, the distance between the end surface of the thermoplastic resin sheet 1 or 3 and the end surface of the thermoplastic resin sheet 2 is widened.
For example, when the distance between the end faces detected by the sensor 22 is a preset distance, the position of the first guide roll 31 or the third guide roll 33 is maintained as it is.

As the edge controller, for example, a device that controls the distance between the edge faces by the routine processing shown in FIG. 3 can be used. Specifically, the routine processing is performed as follows.
First, the distance between the end faces detected by the sensor 22 is entered as a variable (step 1). Next, the variable is compared with a preset lower limit value of the distance between the end surfaces, and it is determined whether or not the value of the variable is equal to or greater than the lower limit value (step 2). In step 2, if the value of the variable is not equal to or greater than the lower limit, the guide roll (the first guide roll 31 or the third guide roll 33) is moved in the width direction, that is, the end surface of the thermoplastic resin sheet 1 or 3 and the heat. It swings in the direction in which the distance from the end surface of the plastic resin sheet 2 increases, and then step 1 is performed again. In step 2, if the value of the variable is equal to or greater than the lower limit, the variable is compared with a preset upper limit of the distance between the end surfaces to determine whether the value of the variable is equal to or less than the upper limit. (step 3). In step 3, if the value of the variable is not equal to or less than the upper limit, the guide roll (first guide roll 31 or third guide roll 33) is moved in the narrow direction, that is, with the end surface of the thermoplastic resin sheet 1 or 3. It swings in the direction in which the distance from the end surface of the thermoplastic resin sheet 2 becomes narrower, and then step 1 is performed again. In step 3, when the value of the variable is equal to or less than the upper limit, the routine processing is terminated.

The winding unit 40 winds the sheet 4 obtained by integrating the thermoplastic resin sheets 1, 2 and 3 by the welding unit 10 around a rotary shaft 40a which is driven to rotate by a drive means.

In the sheet integrating apparatus 100, the conveying means 11 of each of the two sets of welding units 10 are driven while synchronizing. That is, the running speeds of the belts 11a of the conveying means 11 of the two sets of welding units 10 are made substantially the same. Therefore, the three thermoplastic resin sheets 1, 2, 3 are delivered at approximately the same delivery speed and run. “Substantially the same” means a numerical range of 98% or more and 102% or less based on the target numerical value.
Further, in the sheet unifying device 100, the rotating shafts 40a of the conveying means 11 and the winding unit 40 are driven in synchronization. That is, the traveling speed of the belt 11a of the conveying means 11 and the rotational speed of the rotating shaft 40a of the winding unit 40 are made substantially the same.

<Seat manufacturing method>
Next, an embodiment of a sheet manufacturing method using the sheet integrating apparatus 100 will be described.
In the sheet manufacturing method of the present embodiment, first, three thermoplastic resin sheets 1, 2, and 3 are continuously formed by three extruders (illustrated) arranged upstream of the sheet integrating device 100. ), and guided by the first guide roll 31, the second guide roll 32, and the third guide roll 33 of the feeding unit 30 so that the thermoplastic resin sheets 1, 2, and 3 are in a parallel state. . Next, the thermoplastic resin sheets 1, 2, 3 are sent out toward the detection mechanism 20, and the thermoplastic resin sheets 1, 2, 3 are run in parallel.

In the detection mechanism 20, the laser beam irradiation unit 21 irradiates a laser beam in the direction of the sensor 22, and the sensor 22 detects the end faces of the thermoplastic resin sheets 1, 2, 3 running between the laser beam irradiation unit 21 and the sensor 22. The distance between the end faces is detected, and the detected distance between the end faces is output to edge controllers (not shown) of the first guide roll 31 and the third guide roll 33 .
The edge controller controls the feeding positions of the thermoplastic resin sheets 1 and 3 based on the distance between the end faces input from the sensor 22 .

The edge controller runs with the edge faces of adjacent thermoplastic resin sheets (thermoplastic resin sheets 1 and 2, or 2 and 3) separated by 3 mm or less, or with the edge faces of adjacent thermoplastic resin sheets in contact with each other. It is preferable to control the feeding positions of the thermoplastic resin sheets 1 and 3 so that the thermoplastic resin sheets 1 and 3 are fed.
According to the study of the present inventors, if the distance between the end surfaces is 3 mm or less, when the ends of the thermoplastic resin sheet are integrated, the thickness t ₂ of the integrated portion 4a is the same as the thermoplastic resin A sheet 4 is obtained in which the ends of the thermoplastic resin sheets are integrated with each other with sufficient strength, although it is as thin as 115% or less of the thickness t1 of the sheets ₁ , 2, and 3.

When the end faces of adjacent thermoplastic resin sheets are separated from each other, the lower limit of the distance between the end faces is over 0 mm. The distance between the end faces is preferably 3 mm or less, more preferably 2 mm or less.

Next, the ends of the adjacent thermoplastic resin sheets (thermoplastic resin sheets 1 and 2, or 2 and 3) are respectively attached to the belts 11a of the conveying means 11 of the first welder 10a and the second welder 10b. The thermoplastic resin sheets 1, 2, and 3 are conveyed by being sandwiched between and rotated by the rolls 11b. In addition, the first heating means 12 and the second heating means 13 sequentially heat and melt the edges of the adjacent thermoplastic resin sheets through the belt 11a, and the melted edges are melted by the pressing roll 14. It is clamped and pressed, and cooled by the cooling means 15 to be solidified. As a result, the ends of the adjacent thermoplastic resin sheets are welded and integrated.

When the thermoplastic resin sheets 1, 2 and 3 are made of a crystalline resin, the heating temperature at that time is preferably a temperature exceeding the melting point of the crystalline resin. When 3 is composed of an amorphous resin, the temperature is preferably higher than the glass transition temperature of the amorphous resin.
_The pressure during pressurization is set so that the thickness t2 of the integrated portion 4a is within the above range.
Specific welding conditions such as heating temperature, heating time, cooling temperature, cooling time, pressure, and pressurizing time are appropriately set according to the material, thickness, and the like of the thermoplastic resin sheets 1, 2, and 3. Even if the thermoplastic resin sheets 1, 2, 3 have the same material, thickness, etc., these conditions are related to each other, so they cannot be determined uniquely.

Next, the sheet 4 obtained by integrating the thermoplastic resin sheets 1, 2 and 3 is wound around the rotary shaft 40a of the rotating winding unit 40 to obtain a roll of the sheet 4. As shown in FIG.

The sheet 4 obtained as described above can be used, for example, in general/industrial landfill sites, turbid water sedimentation ponds, industrial waste liquid treatment ponds, sludge dredging ponds, agricultural reservoirs, residential land development adjustment ponds, golf courses, gardens, and parks. Ornamental ponds, agricultural and industrial waterways, drainage channels, box tunnels, external waterproofing of underground structures such as buildings, pools and tanks, earth dams, rockfill dams, impermeable cores such as river dams and reservoir dams, desk mats, trucks It can be used in industrial fields such as sheets, tent warehouse fabrics, container bags, sheet shutters, sheet partition curtains, screens and blinds.

In addition, this invention is not limited to the said embodiment. Each configuration and combination thereof in the above-described embodiment are examples, and addition, omission, replacement, and other modifications of the configuration are possible without departing from the scope of the present invention.
For example, in the second step, the sheet integrating apparatus 100 is used to melt and crimp the ends of each of the plurality of resin sheets, but the method of integrating the ends of the plurality of resin sheets It is not limited to this.

The ends of the plurality of resin sheets may be integrated by a method of melting the ends of each of the plurality of resin sheets and the welding rod and pressing them together. The welding rod used in this method contains a thermoplastic resin. The thermoplastic resin forming the welding rod is typically the same as the thermoplastic resin forming each of the plurality of resin sheets.

In the sheet integrating apparatus 100 , the detection mechanism 20 may be provided near the end of the thermoplastic resin sheet 1 or 3 on the side opposite to the thermoplastic resin sheet 2 side. In this case, the distance between the end faces of the thermoplastic resin sheets 1, 2 or 2, 3 can be detected from the position of the end face of the thermoplastic resin sheet 1 or 3.

In the welding unit 10, the roll 11b may not be driven to rotate by a drive means.
Further, in the welding unit 10, for example, instead of the conveying means 11 in which the belt 11a rotates, a pair of rolls that sandwich the thermoplastic resin sheet while being driven to rotate may be used as the conveying means, or the conveying means may be omitted. good too.
Also, the welding unit may be a heating roll that sandwiches and welds the thermoplastic resin sheet.

One or both of the feeding unit and the winding unit may be horizontally mounted such that the two rotating drums are adjacent to each other and are axially parallel. In such a feeding unit and winding unit, the windings of the thermoplastic resin sheets 1, 2, 3 are arranged on two rotating drums and the thermoplastic resin sheets 1, 2, 3 are placed on the two rotating drums. Rotate the take-up.
The resin sheet produced in the first step is wound into a roll to form a wound product, and part or all of the first guide roll 31, the second guide roll 32 and the third guide roll 33 of the feeding unit 30 are may be replaced with a rotating shaft to which the wound article can be rotatably attached, the wound article may be attached to each rotating shaft, and each wound article may be opened to perform the second step.

At least two resin sheets should be integrated. Also, the sheet may have at least one integrated portion.

Since the thickness t2 of the integrated portion in the sheet obtained by integrating a plurality of resin sheets as described above is 90% or _more and 115% or _less of the thickness t1 of the resin sheet, the sheet is wound into a roll. Hard to deform when worn.
In addition, the integrated portion maintains sufficient strength (tensile modulus, etc.) with respect to other portions (for example, the central portion of each resin sheet), and is more flexible than other portions and is easily bendable. act as a part. The tensile elastic modulus of the easily bendable portion is, for example, 80% or more and 98% or less of the tensile elastic modulus of the other portions.
For example, when a sheet having an easily bendable portion is used as a waterproof sheet for a waste disposal site, even if the surface to be constructed has unevenness, the sheet has excellent workability because the adhesion to the unevenness is improved.

1, 2, 3 Thermoplastic resin sheet 4 Sheet 4a Integrated portion (easily bendable portion)
REFERENCE SIGNS LIST 10 Welding Unit 11 Conveying Means 11a Belt 11b Roll 12 First Heating Means 13 Second Heating Means 14 Pressing Roll 15 Cooling Means 20 Detecting Mechanism 21 Laser Light Irradiating Section 22 Sensor 30 Feeding Unit 31, 32, 33 Guide Roll 40 Winding unit 40a Rotating shaft 100 Sheet integration device

Claims (4)

A step of manufacturing a plurality of resin sheets (excluding foam sheets) having _a thickness t1 of 0.1 to 5 mm by molding a thermoplastic resin into sheets by an extrusion molding method or an inflation molding method; ,
While sending out and running the plurality of resin sheets, the ends of the plurality of resin sheets in the width direction are joined _together so that the thickness t2 of the integrated portion is 90% or more and 115% or _less of the thickness t1. a step of integrating into one sheet so as to be
including
The method of integrating the ends of the plurality of resin sheets is a method of melting and crimping the ends of each of the plurality of resin sheets,
A method for manufacturing a sheet, wherein the plurality of resin sheets are integrated by running with the end surfaces of the resin sheets spaced apart by 3 mm or less or with the end surfaces of the resin sheets in contact with each other. 2. The method of manufacturing a sheet according to claim 1, wherein distances between end surfaces of the plurality of resin sheets during running are detected, and feeding positions of the plurality of resin sheets are controlled based on the detected distances. Having at least one bendable portion extending in the longitudinal direction,
The easily bendable portion is an integrated portion of a plurality of resin sheets,
The sheet, wherein the easily bendable portion has a tensile elastic modulus of 80% or more and 98% or less with respect to the tensile elastic modulus of the other portions. The thickness of the other portion is 0.1 to 5 mm,
4. The sheet according to claim 3, wherein the thickness of the easily bendable portion is 90% or more and 115% or less of the thickness of the other portion.

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