KR102456263B1 - A water-repellent sheet having a cross-sectional structure in which the thickness of the edges is relatively thicker than the thickness of the central portion, and a method for manufacturing the same - Google Patents

Abstract

The present invention relates to a water-repellent sheet having a cross-sectional structure in which the thickness of an edge part is greater than that of the central part, which can increase water repellency, and a manufacturing method thereof. According to one embodiment of the present invention, a method for manufacturing a water-repellent sheet having a step comprises the steps of: primarily molding a synthetic resin melt extruded through an extruder into a water-repellent sheet having a uniform first thickness through a first roller unit; heating and pressing the primarily molded water-repellent sheet with a second roller unit to perform secondary molding so that a step is formed between an edge part and the central part; processing the secondly molded water-repellent sheet with hot air; and additionally heating and pressing the water-repellent sheet processed with the hot air with a third roller unit to perform tertiary molding. The second roller unit includes a second upper roller and a second lower roller and, in the second upper roller, the size of the radius of a first part for heating and pressing the edge part of the primarily molded water-repellent sheet is less than that of a second part for heating and pressing the central part of the primarily molded water-repellent sheet.

Description

A water-repellent sheet having a cross-sectional structure in which the thickness of the edges is relatively thicker than the thickness of the central portion, and a method for manufacturing the same}

The present specification proposes a waterproof sheet having a step formed due to a difference in thickness between the edge and the central portion, and a method for manufacturing the same.

In general, waterproofing works are essential for tunnels, underground structures, roofs of building structures, or upper surfaces of parking lots, etc. to prevent water leakage due to external inflows, etc. have.

Among them, the waterproofing construction using the sheet is made of high-strength synthetic rubber, synthetic resin, or rubberized asphalt as the main raw material, and a waterproofing sheet of a certain standard is manufactured and firmly attached to the floor or wall to cope with the inflow of water from the outside. made to be

This waterproofing sheet is a waterproofing method that forms a waterproofing layer by spreading and installing a sheet-shaped waterproofing material on the surface to be waterproofed. one

The waterproof sheet used for such sheet waterproofing is a roll-type waterproofing sheet having a certain width and length (normally 1m to 2m in width and 10m to 20m in length) in the factory in advance to facilitate construction and handling on site. As described above, they are installed at regular intervals on the roof and other surfaces requiring a higher order.

In general, in the case of an asphalt waterproofing sheet, the overlapping part is heated and melted using a heat device such as a hot air blower, and in the case of a synthetic resin or synthetic polymer-based waterproofing sheet, an adhesive or adhesive tape is used. or (EPDM sheet, PVC sheet, TPO sheet, etc.), welding using a solvent, or hot air welding using a hot air welding machine (PVC sheet, TPO sheet, ECB sheet, EVA sheet, HDPE sheet, etc.) .

In such a water-repellent method, a water-repellent sheet is installed on the floor surface such as a tunnel, an underground structure, or the roof of a building. At the same time, a work of pressing the upper part of the overlapping waterproof sheet using a roller while at the same time fusion of the waterproof sheets to each other by sending hot heat to the bottom surface of the waterproof sheet superimposed on the top and the top surface of the bottom waterproof sheet overlapping the lower part to make a stronger attachment joint.

On the other hand, the polymer synthetic resin-based waterproofing sheet for domestic tunnels is formed to have a uniform thickness (eg, about 1.1 to 1.3mm), and the connection of each waterproofing sheet panel is made through the above-described thermal fusion. Since the thickness of the waterproof sheet is uniform in its entire width, and the connection between the waterproof sheets is performed in such a way that they are heat-sealed while overlapping each other, the thickness of the connection/heat-sealed area (joint) of the waterproof sheet is different from the thickness of other areas (e.g. For example, it had to be formed thinner than about 1.1 to 1.3 mm).

When the concrete lining is installed on the outer surface (upper surface) of the waterproof sheet installed on the tunnel shotcrete surface, an external force is applied to the waterproof sheet by the working pressure. At this time, due to the uniform thickness of the waterproof sheet, the load is directly transferred to the entire waterproof sheet, but more external force is concentrated (stress concentration phenomenon) in the heat-sealed portion formed with a relatively thinner thickness, and damage due to this is the main defect. has been cited as the cause.

In the present specification, a method for manufacturing a waterproof sheet for solving these problems and a waterproof sheet manufactured by the method are proposed.

According to an embodiment of the present invention, there is provided a method for manufacturing a barrier sheet having a step, the method comprising the steps of: first molding a synthetic resin melt extruded through an extruder into a barrier sheet having a uniform first thickness through a first roller unit; Secondary molding so that a step is formed between the edge portion and the central portion by heating and pressing the firstly formed waterproof sheet with a second roller unit; Hot air treatment on the secondary molded waterproof sheet; and additionally heating and pressing the hot-air-treated water-repellent sheet with a third roller to form a third; The second roller part includes a second upper roller and a second lower roller, and in the second upper roller, the radius of the first part for heating and pressing the edge of the firstly-formed waterproof sheet The size may be smaller than the size of the radius of the second portion that heats and presses the central portion of the first-formed waterproof sheet.

According to an exemplary embodiment of the present invention, it is possible to minimize damage to the water-blocking sheet and the rate of occurrence of defects due to the damage, and at the same time, it is possible to improve the water-repellent performance.

In addition, according to an embodiment of the present invention, an external load is induced to uniformly act on the central portion of the water-repellent sheet rather than the heat-sealed portion, and a uniform stretching deformation behavior is induced so that a mechanically stable structure of the water-repellent sheet lining is possible. there is

In addition, according to an embodiment of the present invention, when a tensile force is induced in the waterproof sheet in the width direction, the load is concentrated in the relatively thin central portion and elongation is induced to the uniform central portion, and the heat-sealed edge portion There is an effect of preventing the occurrence of defects in the joint between the sheets by minimizing the load action.

In addition, according to an embodiment of the present invention, since the thickness of the central portion of the waterproof sheet is reduced, the amount of raw material required is reduced compared to a conventional waterproof sheet having a uniform full width thickness, thereby reducing the cost of the waterproof sheet. .

1 is a cross-sectional view of a waterproof sheet according to an embodiment of the present invention.
2 is an enlarged cross-sectional view of a thermal fusion region between the barrier sheets according to an embodiment of the present invention.
3 is a view illustrating a method of manufacturing a waterproof sheet according to an embodiment of the present invention.
4 is a flowchart illustrating a method of manufacturing a waterproof sheet according to an embodiment of the present invention.
5 is a cross-sectional view of a second upper roller according to an embodiment of the present invention.
6 is a cross-sectional view of the waterproof sheet after passing through the second roller unit according to an embodiment of the present invention.

Since the technology to be described below can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the technology described below to specific embodiments, and it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the technology described below.

Terms such as first, second, A, and B may be used to describe various components, but the components are not limited by the above terms, and only for the purpose of distinguishing one component from other components. used only as For example, a first component may be named as a second component, and similarly, the second component may also be referred to as a first component without departing from the scope of the technology to be described below. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items. For example, 'A and/or B' may be interpreted as meaning 'at least one of A or B'. Also, '/' may be interpreted as 'and' or 'or'.

In terms of terms used herein, the singular expression should be understood to include a plural expression unless the context clearly dictates otherwise, and terms such as "comprises" include the described feature, number, step, operation, and element. , parts or combinations thereof are to be understood, but not to exclude the possibility of the presence or addition of one or more other features or numbers, step operation components, parts or combinations thereof.

Prior to a detailed description of the drawings, it is intended to clarify that the classification of the constituent parts in the present specification is merely a division according to the main function that each constituent unit is responsible for. That is, two or more components to be described below may be combined into one component, or one component may be divided into two or more for each more subdivided function. In addition, each of the constituent units to be described below may additionally perform some or all of the functions of other constituent units in addition to the main function it is responsible for. Of course, it can also be performed exclusively by

In addition, in performing the method or operation method, each process constituting the method may occur differently from the specified order unless a specific order is clearly described in context. That is, each process may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

1 is a cross-sectional view of a water-blocking sheet according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a thermal fusion region between the water-blocking sheets according to an embodiment of the present invention.

More specifically, FIG. 1(a) is a cross-sectional view of a water-blocking sheet according to the prior art, and FIG. 1(b) is a cross-sectional view of a water-blocking sheet according to an embodiment of the present invention. In addition, Figure 2 (a) is an enlarged cross-sectional view of the heat-sealing portion between the barrier sheets according to the prior art, Figure 2 (b) is an enlarged cross-sectional view of the heat-sealing portion between the barrier sheets according to an embodiment of the present invention.

Referring to FIG. 1A , the conventional polymer synthetic resin-based waterproofing sheet 110 for tunnels is manufactured to have a uniform thickness t1 across the entire width. Looking at domestic and foreign regulations for the size of the waterproof sheet 110, the minimum required thickness (t1) is defined as 0.75mm, and in particular, in Korea, the minimum thickness (t1) is defined as 1.1mm to secure the stability of the heat-sealing behavior, have. Therefore, in the case of the domestic tunnel sheet 110, the overall width is manufactured with a uniform thickness (t1) within the range of about 1.1 ~ 1.3mm.

Referring to FIG. 2( a ), the conventional waterproof sheets 110 - 1 and 110 - 2 have edges of each of the waterproof sheets 110 - 1 and 110 - 2 (eg, 100 mm from the boundary line of the waterproof sheets). Edge region within the length) can be interconnected by thermal fusion in a state overlapped with each other on a plane, and the thickness t1 of other regions as a result of compression of the connecting portion (ie, thermal fusion part) 110-3 due to thermal fusion characteristics A relatively thinner thickness t3 may be formed. As such, when the heat-sealed portion 110-3 is formed to have a thinner thickness (t3) than other parts, the working pressure applied when the concrete lining is installed is concentrated on the heat-sealed portion 110-3 (stress concentration phenomenon), and the water-repellent sheet is formed. It is easily damaged, and as a result, there was a problem that led to a defect problem in the overall construction.

Therefore, in this specification, in order to solve this problem, as shown in FIG. 1( b ), a waterproof sheet having a cross-sectional structure in which the thickness of the edge is relatively thicker than the thickness of the center is proposed.

More specifically, as illustrated in FIG. 1 ( b ), the waterproof sheet 120 according to an embodiment of the present invention is stably thermally fused to maintain a thickness of at least a certain level even after thermal fusion is performed. The edge is formed with a first thickness t1 (eg, about 1.1 to 1.3 mm), and the central part is formed with a second thickness t2 (eg, 0.8 mm to 0.95 mm) that is relatively thinner than the first thickness. can be formed. In this way, when the first thickness t1 is formed relatively thicker/larger/thicker than the second thickness t2, as illustrated in FIG. 2(b), the thickness t4 of the heat-sealed portion 120-3 may be formed to be thicker than the thickness t2 (ie, the second thickness) of the central portion.

According to this embodiment of the present invention, it is possible to induce the external load by the operation such as pouring the outer surface concrete lining to act on the central part of the waterproof sheet rather than the heat-sealing part 110-3, and uniform stretching deformation behavior It has the effect of inducing a stable configuration of the waterproof sheet lining. That is, when the thickness of the edge and the central portion are different so that the water-repellent sheet 120 has a step, the load is concentrated in the relatively thin (small) central portion as a tensile force is induced in the width direction of the water-repellent sheet 120 , Since the elongation behavior is induced in the uniform central portion, the load action on the heat-sealed portion 120-3 is minimized, thereby preventing damage/defects of the heat-sealing/connecting portion 120-3 from occurring. Furthermore, since the thickness of the central portion of the water-blocking sheet 120 is reduced, there is an effect of reducing the cost compared to the water-blocking sheet 110 that is formed to have the same thickness as the entire width.

Hereinafter, the edge portion on which the heat-sealing operation is performed has a first thickness (eg, about 1.1 to 1.3 mm), and the central portion has a second thickness (minimum required thickness, for example, 0.8 mm to 0.95 mm) thinner than the first thickness. ) to specifically propose a method of manufacturing the waterproof sheet 120 .

3 is a diagram illustrating a method of manufacturing a water-blocking sheet according to an embodiment of the present invention, and FIG. 4 is a flowchart illustrating a method of manufacturing a water-blocking sheet according to an embodiment of the present invention.

Referring to FIGS. 3 and 4, first, the synthetic resin melt extruded through the T-dies of the extruder 310 may be first formed into a waterproof sheet of a uniform first thickness through the first roller part 320 ( S401). In this case, the thickness of the molded waterproof sheet may be uniform with an overall width of about 1.1 to 1.3 mm. The molding/extrusion temperature of the primary roller part may be controlled at a level of 50 to 60% of the molding/extrusion temperature of the extruder 310, and through this, the order sheet is maintained in an unsolidified state while the second roller part ( 330) direction.

Next, the water-repellent sheet input/advanced to the second roller unit 330 (ie, the first-formed water-repellent sheet) may be heated and pressed through the second roller unit 330 to be secondarily formed ( S402 ). .

The second roller unit 330 may include a second upper roller 330 - 1 and a second lower roller 330 - 2 , and the second upper roller 330 - 1 is a first-formed order On the upper surface of the sheet, the second lower roller 330 - 2 may be in contact with the lower surface of the firstly molded waterproof sheet to perform a function of pressing and heating the waterproof sheet. At this time, the extrusion/molding temperature of the second upper and lower rollers 330 - 1 and 330 - 2 may be controlled within a preset temperature range, for example, 50° C. to 85° C. range. The second roller unit 330 is accommodated in a prefabricated case 340 with a size that can accommodate both the second upper and lower rollers 330 - 1 and 2 in order to control the temperature of the surrounding air (ie, the casing). In addition, a temperature control device (not shown) may be additionally provided in the case 340 to be synchronized with the temperature control of the second lower roller.

Furthermore, in the water-repellent sheet, a step may be formed between the edge portion and the center portion due to the structural characteristics of the second roller portion 330 (particularly, the second upper roller 330 - 1 ), which will be described below with reference to FIG. 5 . will be described in detail later.

5 is a cross-sectional view of the second upper roller according to an embodiment of the present invention, and FIG. 6 is a cross-sectional view of the waterproof sheet after passing through the second roller unit according to an embodiment of the present invention.

More specifically, Fig. 5(a) is a cross-sectional view of the second upper roller of type A type according to the first embodiment, and Fig. 5(b) is a cross-sectional view of the second upper roller of type B type according to the second embodiment. to be. 6(a) is a cross-sectional view of the A-type waterproof sheet according to the first embodiment, and FIG. 6(b) is a cross-sectional view of the B-type waterproof sheet according to the first embodiment.

Referring to FIG. 5 , in the second upper rollers 330 - 1a and 330 - 1b , the radius size r1 of the first portion l1 that heats and presses the edge portion l1 ′ of the firstly formed order sheet. may be formed to be smaller than the radius size r2 of the second portion l3 that heats and presses the central portion l3'. For example, in the second upper rollers 330-1a and 330-1b, the radius r1 of the first portion l1 is within the range of 0.15 mm to 0.5 mm than the radius r2 of the second portion l3. It may be formed to be relatively smaller by the length. In addition, although not shown separately, the second lower roller may be provided as a roller having a uniform overall radius. The interval between the first portion l1 of the second upper rollers 330-1a and 330-1b and the second lower roller is the thickness of the edge portion l1' of the waterproof sheets 120-a and 120-b. 1 thickness t1 (eg, in the range of about 1.1 to 1.3 mm) and may be set / provided with the same length, the second portion l3 of the second upper rollers 330 - 1a and 330 - 1b and the second The distance between the two lower rollers is set to be the same length as the second thickness t2 (eg, about 0.8 mm to 0.95 mm), which is the thickness of the central portion l3' of the water-repellent sheets 120-a and 120-b. /may be available. The length of the first portion l1 (that is, the width of the edge l1 ′) may be set to various values according to embodiments, for example, 100 mm for A type and about 150 mm for B type. can be (ie, l1 or l1'=100mm or 150mm).

As the waterproof sheets 120-a and 120-b pass between the second upper parts 330-1a and 330-1b and the lower rollers having these structural features, as shown in FIG. 6, the edge 11' ) is a first thickness t1 (eg, within a range of about 1.1 to 1.3 mm), and a central portion l3 ′ is a second thickness t2 (eg, about 0.8 mm to 0.95 mm). (120-a, 120-b) can be secondary molded. In particular, when passing between the second upper roller 330-1a and the second lower roller illustrated in FIG. , when passing between the second upper roller 330-1b and the second lower roller illustrated in FIG.

The types 120-a and 120-b of the waterproof sheet exemplified as A-type and B-type may be classified according to whether or not a connection part l2' connecting the edge part l1' and the center part l3' is formed. have. For example, the A-type 120-a corresponds to a type in which a connecting portion l2' connecting the edge 11' and the central portion l3' at a predetermined inclination angle is formed, and the B-type is the edge portion l1. ') and the connection portion l2' connecting the central portion l3' is not separately formed. The length of the connection part l2' may be set to various values according to embodiments, for example, may be set to about 300 mm (ie, l2=300 mm).

Meanwhile, although not shown in these drawings, a predetermined pattern (eg, zigzag, cogwheel, embossing, etc.) may be protruded from the surface of the first portion of the second upper and/or lower roller. This is to improve the frictional force between the edges of the waterproof sheet so that the overlapping/fixed state between the edges of the waterproof sheet can be more easily maintained without a separate device or mechanism during the thermal fusion process.

Referring back to FIGS. 3 and 4 , next, in order to control the solidification rate for shape stability and stabilization of the secondary molded waterproof sheet formed/manufactured with different cross-sectional thicknesses, the secondary molded waterproof sheet is heated with a hot air device 350 ) can be subjected to hot air treatment by passing it through (S403). The hot air treatment temperature of the hot air device 350 may be controlled within a temperature range of 60 °C to 80 °C.

Next, the hot-air-treated waterproof sheet may be further heated and pressurized using the third roller unit 360 to be tertiarily molded (S404).

Like the second roller unit 330 , the third roller unit 360 may also include a third upper roller 360 - 1 and a third lower roller 360 - 2 . Furthermore, the third upper roller 360 - 1 and the third lower roller 360 - 2 are formed in order to maintain the state stability and the tension state until the secondary-molded order sheet is completely solidified, and the second upper roller 330 is -1) and the second lower roller 330-2 may be configured/prepared in the same shape and size. However, the extrusion temperature of the third roller unit 360 may be controlled within a lower temperature range (eg, 35° C. to 50° C.) than the extrusion temperature of the second roller unit 330 .

Finally, the order sheet completed up to the third molding may be guided in the direction of movement in the direction of the winding roller 380 by the guide roller 370 and finally wound on the winding roller 380 ( S405 ).

Each step illustrated in FIG. 4 may be implemented through at least one hardware and software configuration. In particular, each step illustrated in FIG. 4 is a CPU (Central Processing Unit), MPU (Micro Processor Unit), MCU (Micro Controller Unit), AP (Application Processor), AP (Application Processor) or in the technical field of the present invention. It may be performed by any well-known type of processor, and the processor may perform each step illustrated in FIG. 4 by controlling each configuration illustrated in FIG. 3 .

Meanwhile, in the present specification, numerical values such as length, height, thickness, etc. are expressed as 'about' for convenience of explanation, which may be interpreted as a numerical value including a ±10% error rate range of the numerical value to be described later.

Although each drawing has been described separately for convenience of description, it is also possible to design to implement a new embodiment by merging the embodiments described in each drawing. In addition, the present invention is not limited to the configuration and method of the embodiments described as described above, but the above-described embodiments are configured by selectively combining all or part of each embodiment so that various modifications can be made. it might be

In addition, although preferred embodiments have been illustrated and described above, the present specification is not limited to the specific embodiments described above, and those of ordinary skill in the art to which the specification belongs without departing from the gist of the claims Various modifications are possible by the person, of course, these modifications should not be individually understood from the technical spirit or perspective of the present specification.

Claims (11)

In the method for manufacturing a waterproof sheet formed with a step,
First molding the synthetic resin melt extruded through the extruder into a waterproof sheet having a uniform first thickness through a first roller unit;
Secondary molding so that a step is formed between the edge portion and the central portion by heating and pressing the firstly formed waterproof sheet with a second roller unit;
Hot air treatment on the secondary molded waterproof sheet; and
3rd molding by further heating and pressing the hot-air-treated water-repellent sheet with a third roller unit; including,
The second roller unit includes a second upper roller and a second lower roller,
In the second upper roller, the size of the radius of the first part for heating and pressing the edge of the primary molded waterproof sheet is equal to the radius of the second part heating and pressing the central part of the primary molded waterproof sheet is smaller than the size,
In at least one of the second upper roller and the second lower roller, the surface of the first part that heats and presses the edge of the firstly-formed waterproof sheet has a predetermined pattern protruding therein. How to make a sheet. The method of claim 1,
A difference in radius between the first and second portions is formed within a range of 0.15 mm to 0.5 mm, a step-difference method for manufacturing a waterproof sheet. 3. The method of claim 2,
A distance between the first portion of the second upper roller and the second lower roller is formed within a range of 1.1 mm to 1.3 mm, and a distance between the second portion of the second upper roller and the second lower roller is 0.8 A method for manufacturing a waterproof sheet formed with a step, which is formed within a range of mm to 0.95 mm. The method of claim 1,
The first forming step is,
maintaining an unsolidified state by controlling the extrusion temperature of the first roller part to a level of 50% to 60% of the extrusion temperature of the extruder; Including, a step-formed waterproof sheet manufacturing method. The method of claim 1,
The secondary molding step is,
controlling the extrusion temperature of the second lower roller within 50° C. to 85° C., and controlling the extrusion temperature of the second upper roller within 50° C. to 85° C.; Including, a step-formed waterproof sheet manufacturing method. The method of claim 1,
The second roller unit is accommodated in a case made to accommodate both the second upper and lower rollers in order to control ambient air temperature. The method of claim 1,
The second lower roller is provided as a roller having a uniform size of an entire radius, and a step is formed in the order sheet manufacturing method. The method of claim 1,
The third roller unit includes a third upper roller and a third lower roller,
The third upper roller and the third lower roller are provided in the same shape and size as the second upper roller and the second lower roller. The method of claim 1,
The tertiary molding step is,
controlling the extrusion temperature of the third roller part within 35°C to 50°C; Including, a step-formed waterproof sheet manufacturing method. The method of claim 1,
The hot air treatment step is,
applying hot air in a temperature range of 60° C. to 80° C. to the second-formed waterproof sheet; Including, a step-formed waterproof sheet manufacturing method. 11. A waterproof sheet prepared by the method of any one of claims 1 to 10, comprising:
The water-repellent sheet, wherein a thickness of a side portion of the water-blocking sheet is formed to be relatively thicker than a thickness of the center portion, and a predetermined pattern is protruded from the edge of the water-repellent sheet.

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