JP6091600B2 - Cleaning sheet and manufacturing method thereof - Google Patents

Description

  The present invention relates to an improvement of a sheet that can be used for various cleanings in a dry state or a wet state, and a manufacturing method that makes it possible to reasonably manufacture such a sheet from an existing nonwoven fabric.

  Nonwoven fabrics are widely used as disposable cleaning sheets. After all, non-woven fabrics have a huge amount of fiber layers, and the resulting dust or dust trapping capability, that is, the cleaning capability is potentially high, while the productivity is high and the cost is low. Because it is available.

  However, in reality, even if the non-woven fabric is used as it is as a cleaning sheet, a very good cleaning ability is not always obtained. In order to ensure the required strength, the nonwoven fabric has numerous fibers arranged very densely, and a large number of fiber layers are overlapped. Therefore, the unprocessed nonwoven fabric does not have a sufficient gap for allowing dust or dust to enter between the fibers, and dust or dust can be wiped off almost only on the surface.

  As shown in Patent Document 1, an improvement in the cleaning ability can be expected if the existing nonwoven fabric is provided with irregularities. Moreover, as shown in Patent Document 2, the improvement of the cleaning ability can be expected even if the nonwoven fabric has a structure in which an elastic fiber layer is provided outside the non-elastic fiber layer.

JP 2011-222010 A JP 2008-7924 A

  Although what is shown by patent document 1 can be evaluated in the point which enables the process from a commercially available nonwoven fabric, when this is used for cleaning, it has not fully demonstrated the said cleaning capability. Moreover, what is shown by patent document 2 is not obtained by processing a commercially available nonwoven fabric, and is unsuitable for using for the disposable cleaning sheet | seat in which low-cost supply property is requested | required.

 Then, this invention aims at provision of the cleaning sheet | seat which can produce | generate using the existing nonwoven fabric, and has high cleaning ability first. A second object of the present invention is to make it possible to reasonably manufacture a cleaning sheet having a high cleaning ability using an existing nonwoven fabric as a starting material.

  In order to achieve the first object, in the present invention, the cleaning sheet has a portion in which thick portions of three layers formed by crushing a three-dimensional waveform in a flat shape are arranged in parallel. The nonwoven fabric is provided with a partial weld that maintains the flat state and a raised portion raised by spraying a pressurized fluid.

  Such a cleaning sheet has a thick portion having a hook shape by the three-layered portions and a thin portion having a groove shape located between the thick portions. At the time of wiping using such a sheet, the thick part has a function of scraping off dust and the like. Since the welding is performed partially, at the time of the wiping, a difference occurs in the deformation amount of the sheet between the portion where the welding is performed and the portion where the welding is not performed. If the amount of deformation of the sheet during wiping is uniform everywhere on the sheet, dust or debris of a certain size, i.e. dust, is scraped well by the sheet, but certain size of dust is scraped off very well. Although such a phenomenon occurs, according to such a sheet, it is possible to effectively scrape various sizes of dust having different sizes depending on the structure. In addition, due to the rubbing, dust enters a three-layered portion from a portion where the welding is not performed, and adheres to the raised portion. As a result, it is possible to effectively capture and remove various sizes of garbage having different sizes.

  It is one of the preferable embodiments of the present invention that the cleaning sheet is provided with the non-raised portions and the raised portions alternately. Moreover, it is one of the preferable aspects of this invention that the cleaning sheet is provided with the raised portions in a scattered manner. In addition, the cleaning sheet has a linear, broken line, or dotted line-shaped weld mark applied along a virtual mesh composed of a virtual first line segment and a virtual second line segment that intersects the first line segment. It is one of the preferred embodiments of the present invention to provide it. Moreover, one of the preferable aspects of this invention is the cleaning sheet (laminated sheet) comprised by laminating | stacking the single layer cleaning sheet and base sheet which were demonstrated above. Specifically, the laminated sheet is configured by laminating the single-layer cleaning sheet on the front and back of the base sheet or on either the front or back of the base sheet.

Moreover, in order to achieve said 2nd objective, in this invention, the manufacturing method of the sheet | seat for cleaning is made to at least one part of this nonwoven fabric, conveying a long nonwoven fabric along the length direction. A first step of continuously forming a bent portion having a corrugated cross-sectional shape in a direction perpendicular to the conveyance direction of the nonwoven fabric along the conveyance direction;
A second step of flattening the non-woven fabric three-dimensionalized by the first step so as to have three overlapping portions in parallel;
A third step of applying partial welding to the nonwoven fabric so that the flat state is maintained;
And a fourth step of forming a raised portion by spraying a pressurized fluid onto the nonwoven fabric that has undergone the third step.

It is one of the preferable aspects of the invention regarding this manufacturing method to perform the second step and the third step at the same time. Moreover, if the 3rd process is implemented in the state which overlap | superposed the nonwoven fabric which passed through said 1st process, and a base sheet, the said laminated sheet which consists of two layers can be manufactured reasonably. Moreover, if the 3rd process is implemented in the state which interposed the base sheet between the one nonwoven fabric which passed the said 1st process and the other nonwoven fabric which passed the 1st process, the said lamination sheet which consists of three layers Can be reasonably manufactured.

  The cleaning sheet according to the present invention has a high cleaning ability and can be produced using an existing nonwoven fabric.

  Moreover, according to the manufacturing method concerning this invention, the cleaning sheet concerning a 1st viewpoint can be rationally manufactured by using the existing nonwoven fabric as a starting material.

FIG. 1 is a cross-sectional configuration diagram of a cleaning sheet according to an embodiment of the present invention, FIG. 2 is a perspective configuration diagram showing a first example of a cleaning sheet (laminated sheet) composed of one base sheet and two sheets having the configuration of FIG. FIG. 3 is a perspective configuration diagram showing a second example of a cleaning sheet (laminated sheet) composed of one base sheet and two sheets having the configuration of FIG. FIG. 4 is a perspective configuration diagram showing a third example of a cleaning sheet (laminated sheet) composed of one base sheet and two sheets having the configuration of FIG. FIG. 5 is a perspective configuration diagram showing a fourth example of a cleaning sheet (laminated sheet) composed of one base sheet and two sheets having the configuration of FIG. FIG. 6 is a perspective configuration diagram showing a fifth example of a cleaning sheet (laminated sheet) composed of one base sheet and two sheets having the configuration of FIG. FIG. 7 is a side view showing the main configuration of an apparatus for carrying out the sheet manufacturing method having the configuration of FIG. FIG. 8 is a plan view showing the main configuration of an apparatus for carrying out the method for manufacturing a sheet having the configuration of FIG. FIG. 9 is a cross-sectional configuration diagram showing the main parts of a pair of forming rollers for performing the first step of the manufacturing method, FIG. 10 is a cross-sectional configuration diagram of the nonwoven fabric that has undergone the second step of the manufacturing method, FIG. 11 is a perspective view of a main part of an example of a pressing roller that performs the second step and the third step of the manufacturing method, FIG. 12 is a side view showing the main configuration of an apparatus for carrying out the method for manufacturing a laminated sheet shown in FIGS.

  A typical embodiment of the present invention will be described below with reference to FIGS. The cleaning sheet S according to this embodiment can be used for various cleanings in a dry state or in a wet state. The sheet S has a structure capable of effectively capturing and removing dust, that is, dust or dust by wiping (wiping) using the sheet S. That is, the sheet S functions as a cleaning wiping body. In addition, the manufacturing method according to this embodiment enables such a sheet S to be reasonably manufactured from such a nonwoven fabric using an existing nonwoven fabric as a starting material. Typically, the sheet S is used for cleaning as it is, or is used for cleaning using a cleaning tool in combination with a part of a cleaning tool main body such as a mop (not shown), for example, a mop head. . Typically, such a sheet S is provided as a one-time-use wiping body, and when combined with a cleaning tool as described above, the sheet S is appropriately replaced according to the frequency of use of the cleaning tool. In some cases, the sheet S is provided by being pre-moistened with water or various aqueous solutions. In this case, the sheet S is provided in a sealed container.

  Such a sheet S is three-dimensionalized so that at least a part of the cross-sectional shape thereof is a wave shape, and then flattened so as to have three overlapping portions 1 in parallel and subjected to partial welding. Thus, the flat state is maintained, and the non-raised portion 2 and the raised portion 3 raised by spraying the pressurized fluid A are used to form the nonwoven fabric M.

  FIG. 1 shows a cross-sectional structure of the sheet S in the thickness direction. (Although not shown, the three-layered portion 1 is in close contact with the upper and lower portions at the position where the welding is performed.) The sheet S is formed between the opposing sides of the sheet S by the three-layered portion 1. A thick portion 4 having a bowl shape and a thin portion 5 having a groove shape located between the thick portions 4 are provided. When the sheet S is rubbed, the thick portion 4 has a function of scraping dust and the like. Since the welding is performed partially, a difference occurs in the deformation amount of the sheet S between the portion where the welding is performed and the portion where the welding is not performed. When the deformation amount of the sheet S at the time of wiping is uniform in any part of the sheet S, a certain size of dust can be scraped well by the sheet S, but a certain size of dust cannot be scraped very well. However, according to the sheet S according to this embodiment, it is possible to effectively scrape various sizes of dust having different sizes depending on the structure. In addition, due to the rubbing, dust enters the three-layered portion 1 from the portion where the welding is not performed, and adheres to the raised portion 3. As a result, it is possible to effectively capture and remove various sizes of garbage having different sizes.

  2-6 has shown the example which bonded the cleaning sheet S shown by FIG. 1 on the front and back of the base sheet Sa, respectively, and comprised the cleaning sheet. (Hereinafter, the cleaning sheet shown in FIGS. 2 to 6 is referred to as a laminated sheet S ′.) That is, the cleaning sheet S is constituted by two sheets S and S and one base sheet Sa. Yes. In the illustrated example, the base sheet Sa is wider than the sheet S, the left edge of the base sheet Sa is located outward from the left edge of the sheet S, and the right edge of the base sheet Sa is the sheet S. It is located outside the right edge of. Moreover, the ear | edge part 6 which is not overlying three sheets is formed in the right end part and left end part of the sheet | seat S, respectively. This ear | edge part 6 is utilized as a clamping location etc. when combining the sheet | seat S concerning a part of said cleaning tool main body. The plurality of thick portions 4, 4... Are formed in parallel with the thin portions 5 interposed between the adjacent thick portions 4, 4. The laminated sheet S ′ has an appropriate thickness that is convenient for rubbing. Although not shown in the drawings, the laminated sheet S ′ can be composed of two sheets, a sheet S and a base sheet Sa.

  In this embodiment, the base sheet Sa constituting the laminated sheet S ′ is made of a material that can be welded to the sheet S, and is integrated with the sheet S by the welding performed on the sheet S. It has become so. Typically, the sheet S is composed of a nonwoven fabric M composed of synthetic fibers or a nonwoven fabric M obtained by mixing synthetic fibers and fibers other than synthetic fibers, and the base sheet Sa is also composed of nonwoven fabric M composed of synthetic fibers or synthetic fibers. It is comprised from the nonwoven fabric M formed by mixing fibers and fibers other than synthetic fibers. In the sheet S constituting the laminated sheet S ′ shown in FIGS. 2 to 6, the welding is performed so that the welding mark 7 has a mesh shape depending on the shape of the peripheral surface of the pressing roller 200 described later.

  The sheet S constituting the laminated sheet S ′ shown in FIGS. 2 to 6 includes the non-raised portions 2 and the raised portions 3 alternately. In particular, the sheet S constituting the laminated sheet S ′ shown in FIG. 6 includes the raised portions 3 in a scattered manner. More specifically, in the laminated sheet S ′ shown in FIG. 2, the raised portion 3 has a strip shape that continues in a direction orthogonal to the continuous direction of the thick portion 4. In the laminated sheet S ′ shown in FIG. 3, the raised portion 3 has a strip shape that continues in the direction along the continuous direction of the thick portion 4. In the laminated sheet S ′ shown in FIGS. 4 and 5, the raised portion 3 has a strip shape that is not orthogonal to the continuous direction of the thick portion 4 but continues in the direction crossing the continuous direction.

  Next, in the manufacturing method according to this embodiment, the cleaning sheet S having the above structure is transported in the process of transporting the existing long nonwoven fabric M along its length direction. The cleaning sheet S is continuously generated from the nonwoven fabric M by sequentially processing.

  This manufacturing method includes the following first to fourth steps. However, there may be other steps other than the first step to the fourth step prior to the first step, and there may be other steps after the fourth step. Furthermore, the first step There may be other steps between the second step, between the second step and the third step, and between the third step and the fourth step.

  The long nonwoven fabric M is typically wound into a roll shape, and is sequentially drawn out from the end of the winding and conveyed. As the nonwoven fabric M, a typical spunlace nonwoven fabric M can be typically used.

  In the first step, at least a part of the nonwoven fabric M to be transported is provided with a bent portion Ma (see FIG. 9) having a cross-sectional shape in a direction perpendicular to the transport direction x of the nonwoven fabric M as a waveform. It is the process of forming continuously along.

  In the example shown in FIGS. 7 and 8, the first process is performed by a pair of forming rollers 100 and 100. The pair of forming rollers 100, 100 are rotated so that the nonwoven fabric M is sandwiched between them, and the nonwoven fabric M is continuously drawn from the upstream side of conveyance between the pair of molding rollers 100, 100 and continuously downstream of the conveyance side. It is designed to send out. Each forming roller 100 is provided with a plurality of circumferential grooves 101 around the rotation axis on the circumferential surface portion with a space between the circumferential grooves 101 adjacent to each other in the rotation axis direction 102. Circumferential teeth 103 are formed between adjacent circumferential grooves 101, respectively. Then, on the side where the pair of molding rollers 100, 100 face each other, the circumferential teeth 103 of the other molding roller 100 enter the respective circumferential grooves 101 of the one molding roller 100, and each revolution of the one molding roller 100. The teeth 103 enter the circular groove 101 of the other forming roller 100. In the example shown in the figure, the circular teeth 103 enter the circular groove 101 so that the nonwoven fabric M is loosely sandwiched between them. Thereby, the nonwoven fabric M which passed through the 1st process is sent out toward the 2nd process in the state which the said bending part Ma was formed in the location except the right-and-left both sides edge part, and the width | variety narrowed.

  In the second step, the non-woven fabric M, which is three-dimensionalized with the bent portion Ma applied in the first step, has a three-layered position Ma that becomes the three-layered position 1 of the sheet S in parallel. It is a process of flattening. The third step is a step of performing partial welding on the nonwoven fabric M so that the flat state of the nonwoven fabric M that has been flattened by the second step is maintained.

  In the example shown in FIGS. 7 and 8, the second process and the third process are rotated while being sandwiched between the non-woven fabric M conveyed through the first process and the cradle 300 to the fourth process. It is carried out at the same time by the pressure roller 200 that sends it out. In the illustrated example, the cradle 300 is constituted by an ultrasonic transducer. Unlike the illustrated example, the cradle 300 may also be formed in a roller shape and vibrated ultrasonically. As shown in FIGS. 8 and 11, the pressing roller 200 has a mesh pattern 201 on its peripheral surface. As a result, the flattened non-woven fabric M is provided with a linear welding mark 7 applied along a virtual mesh composed of a virtual first line segment and a virtual second line segment intersecting the first line segment. It has become so. The line portion constituting the mesh pattern 201 slightly protrudes from the remaining peripheral surface of the pressing roller 200. When the nonwoven fabric M is sandwiched between the pressing roller 200 and the cradle 300, as shown in FIG. 10, the portion where the bent portion Ma of the nonwoven fabric M is formed is uniformly crushed as a whole. It is flattened so as to have three overlapping points Ma in parallel along the transport direction x. At the same time, the cloth surfaces of the crushed and overlapped nonwoven fabric M are welded by heat generated by ultrasonic vibration applied from the cradle 300. Only the portion of the pattern 201 formed on the peripheral surface of the pressure roller 200 is welded. Thereby, this flat state of the nonwoven fabric M which became the flat state is maintained. In the example shown in the drawing, the nonwoven fabric M flattened by the pattern 201 of the pressing roller 200 shown in FIGS. 8 and 11 is attached to the sheet S constituting the sheet S and the laminated sheet S ′ generated from now on. A network-like welding mark is formed to be the welding mark 7 to be formed. The pattern 201 of the pressing roller 200 is not limited to the mesh shape as long as the flattened nonwoven fabric M is partially welded to maintain the flat state. For example, if the pattern 201 of the pressing roller 200 is configured from a set of a plurality of protrusions, the welding mark 7 can be formed in a broken line shape or a dotted line shape.

  A 4th process is a process of forming the raising part 3 by spraying pressurized fluid A, such as pressurized air and pressurized steam, to the nonwoven fabric M which passed through the said 3rd process.

  In the example of illustration, the nonwoven fabric M of this spraying part is extended and weakened by spraying the pressurized air as the pressurized fluid A with the air nozzle 400 on the surface of the nonwoven fabric M conveyed through the said 3rd process. The sprayed portion is the raised portion 3 of the sheet S generated from the nonwoven fabric M. In the illustrated example, the raised portions 3 are formed in the range where the three-layered place Ma formed in the second step is formed, and this range includes the non-raised portions 2 and the raised portions 3 alternately. ing. The air nozzle 400 typically uses an air nozzle whose operation is controlled by a control device (not shown). By moving the air nozzle 400 itself back and forth or / and right and left with respect to the conveyance direction x of the nonwoven fabric M under predetermined control, the raised portion 3 as shown in FIGS. The sheet S can be formed. Further, if the pressurized fluid A is intermittently ejected from the air nozzle 400, the raised portions 3 can be formed in a scattered manner on the sheet S as shown in FIG.

  The above manufacturing method makes it possible to generate the cleaning sheet S shown in FIG. 1 from the existing nonwoven fabric M reasonably and inexpensively. That is, since the fibers are loosened in the raised portions 3 and the gaps between the fiber ends are opened, fine dust can be taken in. In the non-raised portions 2, the fibers are intertwined with each other, so the fibers are weak. It is possible to scrape even dust of a size that cannot be scraped off by the raised portion. That is, according to the manufacturing method concerning this embodiment, it becomes possible to manufacture the cleaning sheet S having such an excellent function by additionally processing an existing general nonwoven fabric M at a low cost. Typically, after the fourth step, the sheet S in a long state is cut along a direction orthogonal to the conveyance direction x and cut into sheets S having a desired size.

  If the third step is performed in a state where the nonwoven fabric M that has undergone the first step and the base sheet Sa are overlapped, a laminated sheet S composed of one sheet S and one base sheet Sa. '(Not shown) can be continuously generated.

  Further, if the third step is carried out with the base sheet Sa interposed between the one nonwoven fabric M that has undergone the first step and the other nonwoven fabric M that has undergone the first step, FIG. The laminated sheet S ′ shown in FIG. 6 can be continuously generated. FIG. 12 schematically shows a main part of a manufacturing apparatus that performs the cleaning method for the laminated sheet S ′. The base sheet Sa is wound into a roll shape, and is sequentially pulled out from the end of the winding and conveyed. As such a base sheet Sa, it is preferable to use a general-purpose nonwoven fabric M such as a thermal bond nonwoven fabric M that is stronger and less expensive than the nonwoven fabric M constituting the sheet S. The non-woven fabric M, which becomes one sheet S constituting the laminated sheet S ′, is conveyed on the upper side of the base sheet Sa thus conveyed, and the other sheet constituting the laminated sheet S ′ on the lower side of the base sheet Sa. The other nonwoven fabric M which becomes S is conveyed. On the other hand, after the first step is performed on the nonwoven fabric M and the other nonwoven fabric M, respectively, the three parties hold the base sheet Sa between the one nonwoven fabric M and the other nonwoven fabric M. It is fed between a pair of pressure rollers 200 and 200 for performing the process and integrated. One of the pair of pressing rollers 200, 200 is configured to be ultrasonically vibrated. And the raised part 3 in the said sheet | seat S is formed by the air nozzle 400 which implements a 4th process in the one nonwoven fabric M and the other nonwoven fabric M, respectively downstream of this pair of press rollers 200,200.

  In addition, this invention is not limited to the aspect described in the said Example etc., All the aspects which implemented the invention described in the claim are included.

Claims (11)

A cleaning sheet made of non-woven fabric,
A thick portion in which three-layered portions formed by flattening the three-dimensional waveform of the nonwoven fabric are arranged in parallel,
A welded portion where the thick portion is welded;
A raised portion where the surface of the nonwoven fabric in the thick portion is raised,
The cleaning sheet which consists of a nonwoven fabric provided with . The raised portion is formed by spraying a pressurized fluid.
The cleaning sheet according to claim 1. Non brushed portion between the cleaning sheet according to 請 Motomeko 1 or claim 2 ing provided alternating with the raised part. The cleaning sheet according to any one of claims 3 brushed portion from 請 Motomeko 1 ing comprises a scattered manner. And the first line segment of the virtual, that Do includes crossover virtual second line and the virtual straight subjected along a net consisting of a broken line shape or a dot-line form of the welded mark in the first line segment the cleaning sheet according to any one of claims 4 to 請 Motomeko 1. The cleaning sheet according to any one of claims 1 to 5, each of the front and back surfaces of the base sheet, or the front and back to one of the base sheet, bonding with an RuKiyoshi掃用sheet. While transporting along the elongated nonwoven fabric in the longitudinal direction, at least a portion of the nonwoven fabric, the bent portion of the orientation of the cross section perpendicular to the conveying direction of the nonwoven fabric wavy, along the transport direction a first step you continuously formed Te,
By flattening the standing conjugated to said non-woven fabric, a second step of distributing a portion of the three-ply parallel,
A third step of subjecting the soluble adhesive to portions of the three-ply,
A fourth step that form a raised hair portion welded the nonwoven fabric,
RuKiyoshi掃用sheet manufacturing method of comprising a. In the said 4th process, the manufacturing method of the sheet | seat for cleaning of Claim 7 which sprays a pressurized fluid on the said nonwoven fabric and forms the said raising part. Method for producing a cleaning sheet according to 請 Motomeko 7 or claim 8 for implementing said second step and the third step at the same time. And the nonwoven fabric that has undergone the first step, in a state of superposing the base sheet, the method for producing a cleaning sheet according to any one of the third step claim from 請 Motomeko 7 you implement 9 . A first nonwoven fabric which has undergone the first step, between the second nonwoven fabric that has undergone the first step, from 請 Motomeko 7 implement the third step while interposing a base sheet according to claim 9 The manufacturing method of the sheet | seat for cleaning as described in any one .

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