JP2009153914A - Cleaning sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning sheet excellent in followability to a cleaning object surface with recesses and projections. <P>SOLUTION: In the cleaning sheet 10, a cleaning part 12 is formed by bonding a plurality of unopened short fiber bundles 20' configured by bonding a plurality of fibers 21 arrayed in one direction with each other by a bonding part 22 extending in a direction crossing the extending direction of the fibers 21 on at least one surface of a base material sheet 11. The fibers 21 extending from the bonding part 22 in the unopened short fiber bundles 20' are opened by frictional force generated by cleaning a cleaning object surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cleaning sheet particularly suitably used for cleaning hard surfaces and the like.

  Various fiber assemblies having a spherical shape are known. For example, Patent Document 1 describes a medium-filled cotton made of ball-like wool fibers and having outer layer wool fibers felted. This ball-shaped medium-filled cotton is obtained by cutting a spread wool fiber sliver into a predetermined length to form a fiber piece, sandwiching the fiber piece between two opposed surfaces, and both or one of the two surfaces. It is manufactured by rubbing the fiber pieces by moving the fiber, making the fiber pieces into a ball shape, and simultaneously humidifying the outer layer portion of the fiber piece to shrink and felt the outer layer portion of the fiber piece that has become a ball shape. .

  Patent Document 2 describes a cotton pad used for bedding and cold clothing. This stuffed cotton body is manufactured by blowing ball-like cotton containing main fibers and binder fibers having a softening point lower by 20 ° C. or more than the fibers into a side fabric, and then heat-treating and integrating them.

  Patent Document 3 describes a spherical fiber structure including wet heat-adhesive crimped staple fibers and thermoplastic crimped staple fibers. A part of the fibers constituting the spherical fiber structure is thermally bonded by wet heat adhesive crimped staple fibers. In this spherical fiber structure, mixed staple fibers including wet heat adhesive crimped staple fibers and thermoplastic crimped staple fibers are spread on a wire mesh, and rolled and rotated on the wire mesh while spraying water in a mist form. Then, the granulated product is impregnated with water, and bubbles are generated by boiling in the hydrated granulated product, and a number of cellular voids are formed inside the granulated product and at the same time wet-heat bonded. It is manufactured by thermally bonding a part of the fibers constituting the granulated product with the crimped staple fibers.

  In each of the above documents, there is no mention of using the spherical fiber assembly described in those documents as a raw material for the cleaning sheet.

  Although it differs from a spherical thing, about the cleaning sheet | seat which has a fiber assembly, the thing of patent document 4 is known, for example. The cleaning sheet described in this document is composed of a heat-weldable sheet and a large number of heat-weldable long fibers joined to the sheet and extending in one direction. The long fibers extend in a direction intersecting with the long fibers, and are joined to the heat-weldable sheet by a plurality of welding wires intermittently arranged in the longitudinal direction of the long fibers. The cleaning sheet collects dust between the long fibers. Since the long fibers are fixed at the front and back by the welding wire, the degree of freedom of movement is limited, and the interfibers It is not enough to collect garbage reliably. In addition, since the garbage is not collected in the weld line portion, it cannot be said that the collection efficiency of the garbage is good.

JP 58-70758 A JP-A-61-125377 JP 2002-212868 A JP-A-9-135798

  An object of the present invention is to provide a cleaning sheet in which various performances are further improved as compared with the above-described prior art.

In the present invention, a plurality of unopened short fiber bundles formed by joining a plurality of fibers arranged in one direction to each other by a joint extending in a direction intersecting with the extending direction of the fibers are provided on at least one surface of a base sheet. Bonded to form a cleaning part,
By cleaning the surface to be cleaned by the cleaning unit, a cleaning sheet is provided in which fibers extending from the joint in the unopened short fiber bundle are opened.

Further, the present invention is a suitable method for producing the cleaning sheet,
A plurality of continuous long fibers arranged in one direction are joined together by a plurality of joints extending in a direction intersecting with the extending direction of the fibers to form a continuous long fiber bundle,
The continuous long fiber bundle is cut between the joints to obtain an unopened short fiber bundle,
The present invention provides a method for producing a cleaning sheet in which a plurality of unopened short fiber bundles are bonded to at least one surface of a base sheet.

  Further, the present invention provides an unopened fiber used as a cleaning portion of a cleaning sheet, wherein a plurality of fibers arranged in one direction are joined to each other by a joint portion extending in a direction intersecting the direction in which the fibers extend. A short fiber bundle is provided.

Furthermore, the present invention is a suitable method for producing the unopened short fiber bundle,
A plurality of continuous long fibers arranged in one direction are joined together by a plurality of joints extending in a direction intersecting with the extending direction of the fibers to form a continuous long fiber bundle,
The present invention provides a method for producing an unopened short fiber bundle, in which the continuous long fiber bundle is cut between the joint portions to obtain an unopened short fiber bundle.

  In the cleaning sheet of the present invention, when the surface to be cleaned is wiped, the fibers are opened in various directions and become bulky. Therefore, the followability to the surface to be cleaned having unevenness is good, and the dust collecting property. In addition, the collection efficiency is excellent, and there is a sense of volume and the wiping comfort is good. Moreover, since the fiber is in an unopened state before use, it is not bulky and can be stored in a compact state.

  The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 shows a perspective view of a first embodiment of the cleaning sheet of the present invention. The cleaning sheet 10 of this embodiment includes a base sheet 11. The base material sheet 11 is a rectangular sheet having a longitudinal direction X and a width direction Y orthogonal thereto. The cleaning sheet 10 has a cleaning unit 12 on one surface of the base sheet. The cleaning unit 12 has a substantially rectangular shape having a longitudinal direction X and a width direction Y in plan view. The cleaning unit 12 is located in the central region in the width direction Y of the base sheet 11. The base material sheet 11 extends laterally from the left and right side edges 12a of the cleaning unit 12 to form a pair of flaps 11a. On the other hand, with respect to the longitudinal direction X, the cleaning unit 12 extends over the entire region of the base sheet 11 in the longitudinal direction X. The cleaning unit 12 is made of a fiber assembly and is formed with a predetermined thickness.

  The fiber aggregate constituting the cleaning unit 12 is composed of an aggregate of unopened short fiber bundles. Hereinafter, the unopened short fiber bundle will be described. FIG. 2 shows an example of an unopened short fiber bundle 20 '. The unopened short fiber bundle 20 ′ is configured such that a plurality of fibers 21 arranged in one direction are joined to each other by a joining portion 22 extending in a direction intersecting with the extending direction of the fibers 21. In the present specification, unopened fiber means that a plurality of fibers are in a bundle of filaments aligned in one direction. Only one joining portion 22 in the unopened short fiber bundle 20 'is formed. The fibers 21 extending from the joint portion 22 in the unopened short fiber bundle 20 ′ are opened by friction with the surface to be cleaned during use of the cleaning sheet 10. By this opening, the unopened fiber bundle 20 ′ has a lump shape and becomes the opened fiber bundle 20 shown in FIG. The opened fiber bundle 20 shown in the figure is substantially spherical, and shows an ideal opened state when the unopened fiber bundle 20 'is opened in a state where it exists alone. Actually, since the fiber opening is performed under the condition that the pressure at the time of cleaning is applied to the cleaning unit 12, the fiber opening bundle 20 has a flat shape with a certain thickness.

  Although the unopened short fiber bundle 20 ′ shown in FIG. 2 is flat, the shape of the unopened short fiber bundle 20 ′ is not limited to this, and is, for example, cylindrical, prismatic, or twisted (spiral). Also good.

  The fiber 21 constituting the unopened short fiber bundle 20 'has a fiber length of preferably 3 to 150 mm, more preferably 5 to 50 mm. By setting the fiber length within this range, the fiber 21 can be well opened and dust can be reliably collected between the fibers. As will be described later, when the fiber 21 has a crimp, the length of the fiber 21 is a length in a state where the crimp is stretched and straightened.

  The joining portion 22 is formed in a substantially central region in the longitudinal direction of the fibers 21 constituting the unopened short fiber bundle 20 '. The joint portion 22 is formed by melting and solidifying the fiber 21, for example. Alternatively, it is formed by bonding with an adhesive. The joining portion 22 has a predetermined width d and extends in a direction orthogonal to the orientation direction of the constituent fibers 21 oriented in one direction. The width d of the joint portion 22 depends on the length and material of the fiber 21 and the means for forming the joint portion 22, but if the width is 0.5 to 80 mm, particularly 1 to 40 mm, the fibers 21 can be reliably joined to each other. it can.

  The number of fibers 21 included in one unopened short fiber bundle 20 ′ is preferably 1 to 1,000,000, more preferably 1,000 to 100,000, although it depends on the thickness of the fiber 21. By setting the number of the fibers 21 within this range, the fiber density of the spread fiber bundle 20 in the opened state can be set to an appropriate value for collecting garbage. For the same reason, the total fineness of the unopened short fiber bundle 20 'as a whole is preferably 1 to 8000 tex, particularly preferably 10 to 4000 tex.

  The thickness of the fiber 21 is preferably 0.05 to 80 dtex, particularly preferably 0.5 to 40 dtex. By setting the thickness within this range, the fibers 21 have appropriate rigidity, and the cleaning unit 12 sufficiently follows the uneven surface to be cleaned, for example, a rail of a sill or a sliding door. Further, the cleaning unit 12 can sufficiently follow narrow corners such as the corners of the room and the door stopper and its periphery. Furthermore, the collection property of garbage improves.

As the fiber 21, it is preferable to use a crimped fiber from the viewpoint of further improving the dust collection property. As the crimped fiber, a two-dimensional crimp or a three-dimensional crimp can be used. The crimped fiber has a crimp rate (JIS L0208) of 5 to 50%, particularly preferably 10 to 30%. The crimp rate is defined as the percentage of the difference between the length A when the fiber is stretched and the length B of the original fiber with respect to the length A when the fiber is stretched, and is calculated from the following equation.
Crimp rate = (A−B) / A × 100 (%)

  The number of crimps of the crimped fibers and the height of the peaks are related to the bulkiness of the spread fiber bundle 20. Specifically, the spread fiber bundle 20 becomes bulky as the number of crimps is larger and the height of the mountain is higher. From this viewpoint, the number of crimps is preferably 3 to 80, particularly 5 to 40. The height of the mountain is preferably 0.1 to 8.0 mm, particularly preferably 0.2 to 4.0 mm.

  The number of crimps is measured according to JIS L1015. The crimp height is measured as follows. Observe the fiber 21 and find three or more non-adjacent portions where the crimp is strongest (high). At each location, an aggregated portion of fibers 21 bent into substantially the same shape (not a single fiber) is found, and the aggregated portion is cut out so that the shape does not collapse. The cut fiber 21 is fixed with a transparent tape on one end side in the longitudinal direction so as not to apply a load other than its own weight and to prevent the cardboard or the like from being distorted on the cardboard or the like placed and fixed horizontally. This fixing is performed so that the difference between the peak and the valley of the fiber 21 becomes the largest when the fiber 21 has a two-dimensional or three-dimensional crimp. The fiber 21 is not lifted from the cardboard or the like and is as close to a straight line as possible, and a photograph thereof is taken. At this time, the scale is included in the same photograph so that the actual size can be confirmed. Using an expandable device such as a copying machine or a scanner, the obtained photograph is enlarged (preferably 4 times or more) so that the fibers 21 can be clearly seen. Then, of the expanded fibers 21, crimps are selected regularly and linear portions are selected. Furthermore, the top and bottom are determined based on the direction in which the disturbance of the fibers 21 is less or the one that is more clearly reflected. Pay attention to the inside and outside of the aggregated portion of the fibers 21, and connect the vertices of adjacent valleys. Then, the distance from the five consecutive peaks to the line connecting the adjacent valleys is measured almost vertically. Pay attention to the magnification, etc., measure each of the five peaks and determine the actual size. This average is taken as the measured value for that sample. The remaining portions cut out from the same sample are similarly measured. Of all the samples, three of the large values are averaged, and the average value is set as the crimp height of the sample.

  In the cleaning sheet 10, unopened short fiber bundles 20 ′ are arranged randomly or regularly on one surface of the base sheet 11, and bonded to the fiber sheet 11 to form the cleaning unit 12. . The unopened short fiber bundle 20 ′ may be arranged without a gap, or is arranged at a predetermined interval so that the surface of the base sheet 11 is exposed between adjacent unopened short fiber bundles 20 ′. May be. Further, the unopened short fiber bundles 20 ′ may be arranged in a single layer, or may be arranged in multiple layers of two or more stages. In any case, the unopened short fiber bundle 20 'is in a state in which the cleaning fiber 12 has a uniform thickness with its constituent fibers 21 opened by friction with the surface to be cleaned. It is advantageous that they are arranged.

  As shown in FIG. 1, the base sheet 11 and the unopened short fiber bundle 20 ′ are joined at a joining point 13. The joining point is formed by, for example, fusion bonding of the base sheet 11 and the constituent fibers 21 of the unopened short fiber bundle 20 '. Alternatively, it is formed by bonding the base sheet 11 and the fibers 21. The junction points 13 may be regularly arranged or randomly arranged. According to the manufacturing method described later, the junction points 13 are regularly arranged.

  The unopened short fiber bundle 20 ′ does not need to be bonded to the base sheet 11 at the position of the bonding portion 22. In other words, it is not necessary to form the junction 13 at the position of the junction 22. As long as the unopened short fiber bundle 20 ′ is joined to the base sheet 11 and does not fall off from the base sheet 11, the unopened short fiber bundle 20 ′ is located at any position of the unopened short fiber bundle 20 ′. May be bonded to the base sheet 11.

The total basis weight of the unopened short fiber bundle 20 ′ constituting the cleaning unit 12 depends on the total fineness of the unopened short fiber bundle 20 ′ and the length of the fibers 21, but is 10 to 1000 g / m ² , particularly 50 to 50-. 500 g / m ² means that the fiber 21 in the opened state follows the uneven surface to be cleaned well, and a sense of volume is given to the cleaning sheet 10 in which the fiber 21 is in the opened state. It is preferable from the viewpoint of improving the wiping comfort.

  As the fiber 21, for example, synthetic fiber made of thermoplastic resin, natural fiber such as cotton and hemp, regenerated fiber such as rayon, semi-synthetic fiber such as acetate, and the like can be used. These fibers can be used alone or in combination of two or more. Considering the ease of forming the joining portion 22 in the unopened short fiber bundle 20 ′ and the ease of joining the unopened short fiber bundle 20 ′ to the base sheet 11, the fiber 21 is easily heat-sealed. It is preferable to use a synthetic fiber made of a thermoplastic resin, which is a material that can be easily used. Examples of the thermoplastic resin include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, acrylic resins, and vinyl resins. The synthetic fiber may be composed of a single resin, or may be a composite fiber (for example, a core-sheath type composite fiber or a side-by-side type composite fiber) formed by combining two or more resins.

  The fiber 21 may be coated with a medicine. By applying chemicals for the purpose of dry and dry cleaning, the collection ability using the adsorption of dust is enhanced. Examples of such agents include various oil component components. As the oil agent component, for example, oil agents such as mineral oil, synthetic oil, silicone oil, and the like, and those obtained by mixing a surfactant, a solvent, an antioxidant, a perfume and the like with the oil agent component can be used. The coating amount of the medicine including the oil component can be about 0.1 to 50% by weight with respect to the weight of the fiber 21.

  When the cleaning sheet 10 of the present embodiment is used for the purpose of wet wet cleaning, impregnation with a cleaning agent dissolves stain stains and solid sticky stains, thereby improving the cleanability. As the cleaning agent, a mixture of a surfactant, a solvent, a disinfectant, a preservative, a fragrance, water, or the like can be used. The impregnation amount of the cleaning agent can be about 20 to 500% by weight with respect to the weight of the fiber 21.

  In addition to being used for the purpose of dry dry cleaning and wet wet cleaning, the cleaning sheet 10 of the present embodiment wipes and wipes liquids such as water, commercially available cleaning agents and WAX agents. It can also be used like a rag, such as impregnating or impregnating.

As the base sheet 11 to which the unopened short fiber bundle 20 'is fixed, for example, various non-woven fabrics and films made of synthetic resin, and paperboard made of pulp from the viewpoint of easy joining to the unopened short fiber bundle 20'. In addition, a paperboard board obtained by mixing a synthetic resin with pulp, or a composite material thereof can be used. When a nonwoven fabric is used, for example, an air-through nonwoven fabric, a spunbond nonwoven fabric, an airlaid nonwoven fabric, and the like are preferable examples. The basis weight of these nonwoven fabrics is preferably ³ to 200 g / m ² , particularly 10 to 100 g / m ² from the viewpoints of strength and strain strength. For the same reason, when a film is used, the basis weight is preferably 3 to 500 g / m ² , particularly preferably 10 to 250 g / m ² . When using paperboard, the basis weight is preferably 10 to 500 g / m ² , particularly preferably ²⁰ to 250 g / m ² . As a synthetic resin which comprises the base material sheet 11, the thing similar to what was mentioned above as a synthetic resin which comprises the fiber 21 can be used.

  For example, as shown in FIG. 3, the cleaning sheet 10 is used by being mounted on a cleaning tool 100. The cleaning tool 100 includes a head portion 101 to which the cleaning sheet 10 can be attached, and a rod-shaped handle 102 connected to the head portion 101 via a universal joint 103. The mounting surface (bottom surface) of the head unit 101 is rectangular in plan view, and in a normal use mode, the cleaning tool 100 performs cleaning by moving the head unit 101 in the width direction (particularly, reciprocating movement). . The cleaning sheet 10 is mounted on the head unit 101 in the cleaning tool 100 including the head unit 101 and the handle 102 connected to the head unit 101 using the base material sheet 11. The cleaning sheet 10 is mounted on the head unit 101 such that the side of the base sheet 11 on which the cleaning unit 12 is not provided faces the mounting surface (bottom surface) of the head unit 101. Next, the flap 11 a in the base material sheet 11 is folded back to the upper surface side of the head unit 101. Further, the flap 11a is pushed into the plurality of flexible sheet holding portions 104 having radial slits in the head portion 101. In this manner, the cleaning sheet 10 can be fixed to the head portion 101 of the cleaning tool 100 using the flap 11a of the base sheet 11. In addition, when the base material sheet 11 includes a net (scrim) as in the embodiment shown in FIGS. 9 and 10 to be described later, the engagement force between the base material sheet 11 and the sheet holding unit 104 is increased. Therefore, it is preferable. In this state, the cleaning sheet 10 according to the present embodiment can be used for wiping and cleaning hard surfaces such as flooring, walls, ceilings, glass, mirrors and furniture, home appliances, home outer walls, and automobile bodies. .

  When the surface to be cleaned is wiped with the cleaning sheet 10 in the attached state shown in FIG. 3, the fibers 21 in the unopened short fiber bundle 20 'are opened by friction between the cleaning unit 12 and the surface to be cleaned. This state is shown in FIGS. 4 (a) and 4 (b). In the cleaning sheet 10 in which the fibers 21 are opened by cleaning, the cleaning unit 12 is composed of an aggregate of the opened fiber bundles 20. Although depending on the degree of frictional force and the pressure applied during cleaning, the thickness of the cleaning sheet in the cleaning section 12 may be 1 to 50 mm, particularly 2 to 30 mm under a load of 300 Pa in the fiber 21 opened state. preferable.

  In a state before opening, the fibers 21 constituting the unopened short fiber bundle 20 ′ are mainly directed in the planar direction of the cleaning unit 12 as shown in FIG. 1. The fibers 21 facing the planar direction are not all directed in the same direction, but are directed in every direction in the plane. As the fibers 21 in this state are opened, the opened fibers 21 face in all directions within the plane of the cleaning unit 12 as shown in FIGS. 4 (a) and 4 (b). Many of the fibers 21 face the thickness direction of the cleaning unit 12. Moreover, one end of the fibers 21 is a free end, so that the degree of freedom of movement is extremely high. Thus, in the opened state, the fibers 21 are oriented in various directions, and the degree of freedom of movement is extremely high, so that dust is entangled between the fibers 21 regardless of the wiping direction of the cleaning sheet 10. be able to. On the other hand, for example, in the cleaning sheet described in Patent Document 4 described in the section of the background art, since all fibers are oriented in one direction, the wiping is performed in a direction crossing the direction. Although it is possible to collect dust between the fibers, when wiping is performed along that direction, the efficiency of collecting the dust is significantly reduced. In addition, since both ends of the fiber are fixed ends, the degree of freedom of movement of the fiber is low, and it is not easy to increase the collection efficiency of dust.

  For the purpose of successfully opening the fibers 21 in the unopened short fiber bundle 20 ', it is not necessary to perform special processing on the unopened short fiber bundle 20'. This is because it is natural that the fibers are opened by applying a frictional force to the fibers that are aligned in one direction. From another aspect, the present invention makes good use of such attributes to maintain a compact form without being bulky before use, and it is bulky to use and exhibits high cleaning performance. It can be said that it provides. However, the fibers 21 can be successfully opened by raising the constituent fibers of the unopened short fiber bundle 20 ′ by hand, combing with a comb or brush, and rubbing before use.

  Next, a preferred method for manufacturing the cleaning sheet 10 of the present embodiment will be described with reference to FIGS. This manufacturing method is roughly divided into (a) a manufacturing process of the unopened short fiber bundle 20 ′ and (b) a bonding process of the unopened short fiber bundle 20 ′ and the base sheet 11. The manufacturing process of the unopened short fiber bundle 20 'in (A) is roughly divided into (I-1) a manufacturing process of a continuous long fiber bundle, and (I-2) a manufacturing process of an unopened short fiber bundle.

  In the manufacturing process of the continuous long fiber bundle of (A-1), a plurality of continuous long fibers arranged in one direction are joined to each other by a plurality of joints extending in a direction intersecting with the extending direction of the fibers. Form a bundle. In the manufacturing process of the unopened short fiber bundle (I-2), the continuous long fiber bundle is cut between the joint portions to obtain an unopened short fiber bundle.

  First, the manufacturing process of the unopened short fiber bundle 20 ′ (A) will be described with reference to FIGS. 5 to 7. FIG. 5 schematically shows an apparatus 30 for producing a continuous long fiber bundle and an unopened short fiber bundle. First, a bundle 23 of continuous long fibers as a raw material is fed out from the supply unit 31. The continuous long fiber bundle 23 is a bundle of a plurality of continuous long fibers that are aligned in one direction. This continuous long fiber becomes the constituent fiber 21 of the target unopened short fiber bundle 20 '. The number of continuous long fibers in the bundle of continuous long fibers 23 is equal to or more than the number of fibers 21 in the target unopened short fiber bundle 20 '.

  The drawn continuous long fiber bundle 23 is introduced into the fiber opening device 32 and is widened in a direction orthogonal to the conveying direction to form a fiber opening tow 24. This state is shown in FIG. In FIG. 6A, the direction from the left to the right of the page is the transport direction. The same applies to FIGS. 6B to 6D. The fiber opening device 3 includes a pair of blooming rolls 33 and 34 provided in plural (three pairs in FIG. 3) along the conveying direction of the continuous long fiber bundle 23. The pair of blooming rolls 33, 34 is a metal groove roll 33 in which a large number of grooves and ridges extending in the circumferential direction are alternately arranged in the axial direction, and is opposed to the groove roll 33 and has a peripheral surface. It is comprised from the anvil roll 34 formed with rubber | gum. The blooming rolls 33 and 34 having such a configuration are known in the art. The continuous long fiber bundle 23 passes between the groove roll 33 and the anvil roll 34, so that the width thereof is widened to form a spread tow 24.

  The opening tow 24 obtained by the opening device 32 is introduced into the drug coating device 35. In the drug application device, the drug is applied from the upper and lower surfaces of the spread tow 24. What was demonstrated previously is used as a chemical | medical agent. For example, a spray device is used for applying the medicine. Moreover, you may use the gravure roll coating method for the coating of a chemical | medical agent.

  The spread tow 24 coated with the medicine is then introduced into the joining device 36. The joining device 36 includes a pair of embossing rolls 36a and 36b. Each embossing roll 36a, 36b is composed of linear protrusions 36c extending in the axial direction thereof arranged at a predetermined interval in the circumferential direction. Each embossing roll 36a, 36b can be heated. In the rotating state, the ridges 36c on one embossing roll 36a are in contact with the ridges 36c on the other embossing roll 36b. When the opened tow 24 passes between both rolls, the continuous long fibers constituting the opened tow 24 are melted and solidified by the action of heat and pressure, and the opened tow 24 has a continuous length constituting it. A plurality of joint portions 22 ′ extending in the direction intersecting with the fiber extending direction is formed. This state is shown in FIG. As shown in FIG. 6 (b), the joint portion 22 ′ extends in a direction orthogonal to the direction in which the continuous long fibers constituting the spread tow 24 extend. In FIG. 6B, the joining portion 22 ′ is shown as a straight line extending in a direction orthogonal to the extending direction of the continuous long fibers constituting the spread tow 24, but instead of this, a straight line extending in an oblique direction or , May be a curve. The distance between each joint 22 'is constant. The continuous long fibers are bonded to each other by the formation of the bonding portion 22 ′. The joining portion 22 ′ corresponds to the joining portion 22 in the unopened short fiber bundle.

  The opened tow 24 in which a plurality of joints 22 ′ are formed is introduced into the slitter 37. The slitter 37 includes a first roll 37a in which a plurality of circular blades are arranged at predetermined intervals in the axial direction of the roll, and an anvil roll 37b. When the spread tow 24 is introduced into the slitter 37, the spread tow 24 is cut along the extending direction of the continuous long fibers and at a predetermined interval in the width direction. Thereby, as shown in FIG.6 (c), the several continuous long fiber bundle 25 formed by cut | disconnecting the opening tow | tow 24 in multiple across the width direction is formed.

  Each continuous long fiber bundle 25 is introduced into the width direction cutting device 38 as shown in FIG. The width direction cutting device 38 includes a first roll 38a in which protruding strips 38c extending in the axial direction of the roll are arranged at a predetermined interval in the circumferential direction, and an anvil roll arranged to face the first roll 38a. 38b. Both rolls 38a, 38b are arranged in a distance relationship such that the convex blade 38c of the first roll 38a is in contact with or close to the peripheral surface of the anvil roll 38b. The continuous long fiber bundle 25 is introduced between both rolls in the width direction cutting device 38, so that the continuous long fiber bundle 25 is positioned between the joining portions 22 ′ (same as shown in FIG. 6D). In the drawing, it is cut along the width direction at a position indicated by an alternate long and short dash line. By this cutting, the target unopened short fiber bundle 20 'is obtained.

  The above is the process of manufacturing the unopened short fiber bundle 20 ′ from the continuous long fiber bundle 23, which is the raw material. The unopened short fiber bundle 20 ′ can also be manufactured by another procedure. This manufacturing method will be described with reference to FIGS. 7 (a) and (b). In this manufacturing method, the process up to the step of forming the spread tow 24 from the bundle of continuous long fibers 23 as a raw material and applying the oil to this is the same as the manufacturing method shown in FIGS. The spread fiber tow 24 coated with the oil agent is introduced into the dividing device 39 and divided into a plurality of pieces along the extending direction of the continuous long fibers and at a predetermined interval in the width direction. 26. This state is shown in FIG. The dividing device 39 includes a pair of blooming rolls 39a and 39b provided in a plurality (three pairs in FIG. 7A) along the conveying direction of the spread tow 24. The pair of blooming rolls 39a and 39b are made of a metal groove roll 39a in which a large number of grooves and ridges extending in the circumferential direction are alternately arranged in the axial direction, and in contact with the groove roll 39a. It is comprised from the anvil roll 39b formed with rubber | gum. The arrangement of the grooves in the groove roll 39a is such that the spread tow 24 is divided into a plurality of parts in the width direction. The number of continuous long fibers in each split spread tow 26 obtained by the splitting device 39 is the same as the number of fibers 21 in the target unopened short fiber bundle 20 '.

  Each split spread tow 26 is then introduced into the joining device 36. The joining device 36 is the same as that shown in FIG. Due to the action of heat and pressure using the joining device 36, the continuous long fibers constituting the split open tow 26 are melted and solidified, and the split open tow 26 intersects with the extending direction of the continuous long fibers constituting the split open tow 26. A plurality of joint portions 22 ′ extending in the direction to be formed are formed. This state is the same as the state shown in FIG. Thereby, a plurality of continuous long fiber bundles 25 are formed. The continuous long fiber bundle 25 is introduced into the width direction cutting device 38. This width direction cutting device 38 is the same as that shown in FIG. The continuous long fiber bundle 25 is cut in the width direction at a position between the joining portions 22 ′ by the width direction cutting device 38. This state is the same as the state shown in FIG. By this cutting, the target unopened short fiber bundle 20 'is obtained.

  Next, the step (b), which is a step of fixing the obtained unopened short fiber bundle 20 ′ and the base sheet 11, is performed. This process will be described with reference to FIG. In the manufacturing apparatus 50 shown in FIG. 8, first, the original fabric 11 ′ is unwound from the original fabric roll 11 a of the base sheet 11. An unopened short fiber bundle 20 'is disposed on one surface of the unrolled original fabric 11'. A suction device 51 is used for this arrangement. The suction device 51 includes a suction pipe 52. One end of the suction pipe 52 is located in a storage box 53 in which a plurality of unopened short fiber bundles 20 ′ are stored. The other end of the suction pipe 52 is positioned on the surface at a predetermined distance from the surface so as to face one surface of the original fabric 11 '. The other end of the suction pipe 52 has a horizontally long opening 52 'extending in the width direction of the original fabric 11'.

  The suction device 51 is activated to suck the unopened short fiber bundle 20 ′ accommodated in the accommodation box 53 together with air. By this suction, the unopened short fiber bundle 20 ′ is sucked into the pipe 52 from one end of the suction pipe 52 and is conveyed through the pipe 52. And it discharges | emits through opening 52 'which is the other end of the pipe 52, and is mounted on the raw fabric 11'. The unopened short fiber bundle 20 'is randomly arranged. By adjusting the degree of suction and the shape of the opening 52 ′, a desired number of unopened short fiber bundles 20 ′ can be arranged on the original fabric 11 ′.

  The original fabric 11 ′ on which the unopened short fiber bundle 20 ′ is placed is introduced into the embossing device 54. The embossing device 54 includes a first roll 54a in which a large number of protrusions 54c are dispersedly disposed on the peripheral surface, and an anvil roll 54b disposed to face the first roll 54a. Both rolls 54a and 54b are arranged in a distance relationship such that the protrusion 54c of the first roll 54a is in contact with or close to the peripheral surface of the anvil roll 54b. Of the two rolls 54a and 54b, at least the first roll 54a is heated. In addition to such an embossing 54 device, an embossing method in which a roll similar to the projection 54c of the first roll 54a is arranged in place of the roll of the anvil roll 54b opposed to the roll 54a, and the projections 54c are brought into contact with each other. (Tip to Tip method) can also be used. By the action of heat and pressure using the embossing device 54, the fibers 21 and the original fabric 11 ′ constituting the unopened short fiber bundle 20 ′ are melted and solidified, and the unopened short fiber bundle 20 ′ and the original fabric 11 ′ are formed. Join. By this joining, a plurality of joining points 13 (see FIG. 1) are formed. As described above, the unopened short fiber bundle 20 ′ is randomly arranged on the raw fabric 11 ′, so that the joining point 13 is formed at an arbitrary position in the unopened short fiber bundle 20 ′. In addition, one joint point 13 is not necessarily formed in one unopened short fiber bundle 20 ', and two or more joint points 13 may be formed in one unopened short fiber bundle 20'. The shape of the joining point 13 is generally shown as a dot (circular) shape, but instead of this, a shape other than a dot (circular) shape such as an elliptical shape, a triangular shape, a square shape, a V shape, or a cross shape is used. It can also be used. Further, in order to improve the bonding strength between the massive fiber assembly bundle 20 and the original fabric 11 ', a bonding line such as a straight line, a diagonal line, or a curve may be used or may be combined.

  In this way, a long cleaning sheet 10 'is obtained. The sheet 10 ′ is introduced into the width direction cutting device 56. The width direction cutting device 56 includes a first roll 56a in which protruding strip blades 56c extending in the axial direction of the roll are arranged at a predetermined interval in the circumferential direction, and an anvil roll arranged to face the first roll 56a. 56b. Both rolls 56a, 56b are arranged in a distance relationship such that the convex blades 56c in the first roll 56a are in contact with or close to the peripheral surface of the anvil roll 56b. By introducing the sheet 10 ′ into the width direction cutting device 56, the sheet 10 ′ is cut along the width direction at a predetermined interval. By this cutting, the sheet 10 ′ becomes a sheet, and the intended cleaning sheet 10 is obtained.

  In this manufacturing method, the medicine coating device 35 described above with reference to FIGS. 5 and 7 may be installed at a position immediately downstream of the embossing device 54 shown in FIG.

  Next, second to fourth embodiments of the present invention will be described with reference to FIGS. 9 to 11. In these embodiments, only the points different from the first embodiment will be described, and the descriptions regarding the first embodiment will be applied as appropriate to points that are not particularly described. 9 to 11, the same members as those in FIGS. 1 to 8 are denoted by the same reference numerals.

  The cleaning sheet 10 of the second embodiment shown in FIG. 9 is different from the first embodiment in the type of the base sheet 11. In detail, the base material sheet 11 in this embodiment is comprised from the net | network (scrim) 11a. The net 11a has a lattice shape. The mesh size, the wire diameter, and the distance between the wires are determined in consideration of the strength of the cleaning sheet 10, the bondability with the opened fiber bundle 20 constituting the cleaning unit 12, and the like. Specifically, the wire diameter of the net 11a is preferably 10 to 5000 μm, and more preferably 50 to 1000 μm. The net 11a may have partially different wire diameters. In that case, it is preferable that the wire diameter of the thick portion is the above value. The distance between the lines of the net 11a is preferably 0.1 to 30 mm, more preferably 5 to 15 mm. The net 11a is made of, for example, a synthetic resin. According to the cleaning sheet 10 of the present embodiment, there is an advantage that the engagement force between the sheet holding unit 104 and the net 11a is increased in a state where the cleaning sheet 10 is mounted on the cleaning tool 100 shown in FIG.

  The cleaning sheet 10 of the third embodiment shown in FIG. 10 is also different from the first embodiment in the type of the base sheet 11. In detail, the base material sheet 11 in this embodiment is comprised from the composite_body | complex of the net | network (scrim) 11a and the nonwoven fabric 11b. As the net 11a, the same one as in the second embodiment can be used. As the nonwoven fabric 11b, the same thing as 1st Embodiment can be used. The net 11a and the non-woven fabric 11b are joined by, for example, heat sealing or bonding with an adhesive. In the base material sheet 11, the net 11 a faces the cleaning unit 12, and the nonwoven fabric 11 b faces the opposite side of the cleaning unit 12. According to the cleaning sheet 10 of the present embodiment, the same effects as the cleaning sheet of the embodiment shown in FIG. 9 are exhibited.

  The cleaning sheet 10 according to the fourth embodiment shown in FIG. 11 is different from the first embodiment in that the cleaning portion has a plurality of strips extending in the longitudinal direction X. Specifically, the cleaning unit is composed of two strips of a first cleaning unit 12A and a second cleaning unit 12B. The widths of the cleaning portions 12A and 12B are substantially the same. Moreover, the basic weight of the fiber 21 is also substantially the same. Each cleaning portion extends in the longitudinal direction X. The base material sheet 11 is exposed between the cleaning parts 12A and 12B. According to the cleaning sheet 10 of the present embodiment, when cleaning convex portions such as anti-slip stairs and frames under the door, the cleaning portions 12A and 12B straddle the convex portions so as to wrap around the convex portions. Therefore, there is an advantage that the followability to the convex portion and the collection property of the dust existing on the convex portion are further improved. From this viewpoint, the distance D between the first cleaning unit 12A and the second cleaning unit 12B is preferably 2 to 80 mm, particularly 10 to 50 mm.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the unopened short fiber bundle 20 ′ in the above-described embodiment, the joint portion 22 is formed in a substantially central region in the longitudinal direction of the fiber 21. Instead, the joint portion 22 is replaced with the longitudinal direction of the fiber 21. You may form in the position deviated from the approximate center area. Further, the joint portion 22 may be formed at one end portion of the fiber 21.

  Further, the unopened short fiber bundle 20 'includes a plurality of first fibers arranged in one direction and a plurality of second fibers arranged in a direction intersecting with the direction, and both fibers are intersections of both fibers. Those formed by being joined to each other by the joint formed in the above may be used.

  Moreover, in the said embodiment, although the example which mounted | wore and used the cleaning sheet | seat 10 for the cleaning tool shown in FIG. 3 was shown, it replaces with this and the cleaning sheet | seat 10 is replaced with the previous application of this applicant. The cleaning cloth formed in the shape of a flat bag having an insertion space described in JP-A-9-299305 is attached, and the cleaning cloth is attached to the handy wiper type cleaning tool described in the publication. Also good. Alternatively, cleaning may be performed by directly gripping the cleaning sheet 10 by hand.

  Moreover, in the said embodiment, although the cleaning part 12 was formed only in the single side | surface of the base material sheet 11, you may form the cleaning part 12 in both surfaces of the base material sheet 11 instead of this.

  Furthermore, the embodiment which combined suitably the base material sheet shown in FIG.9 and FIG.10 and the cleaning part shown in FIG. 11 is also within the scope of the present invention.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples.

[Example 1]
(1) Production of unopened short fiber bundle An unopened short fiber bundle 20 ′ was produced according to the method shown in FIG. The fiber 21 used was a core-sheath type composite fiber having a core made of polyethylene terephthalate and a sheath made of polyethylene. The fineness of this fiber was 2.2 dtex. The number of crimps of the fiber 21 was 16.51, and the crimp height was 0.87 mm. The fiber length was about 45 mm. The unopened short fiber bundle 20 ′ had a total fineness of about 3700 tex and a weight of about 0.13 g. The joint portion 22 was formed in a substantially central region in the longitudinal direction of the fiber 21 with a width of 5 mm. The unopened short fiber bundle 20 ′ was coated with 5% by weight of liquid paraffin as an oil agent based on its weight.

(2) Production of Cleaning Sheet A cleaning sheet 10 was produced using the apparatus shown in FIG. An air-through nonwoven fabric having a basis weight of 40 g / m ² was used as the base sheet 11. This nonwoven fabric was composed of a polyester / polyethylene core-sheath type composite fiber having a fineness of 2.2 dtex. The base sheet 11 had a length in the longitudinal direction X of 280 mm and a length in the width direction Y of 210 mm. Forty unopened short fiber bundles 20 ′ are arranged randomly and in a single layer on one surface of the substrate sheet 11. The arranged region was a region over the entire region in the longitudinal direction X in the range of 120 mm in the central region in the width direction Y of the base sheet 11. The unopened short fiber bundle 20 ′ and the base sheet 11 were joined by thermal fusion to form the cleaning unit 12. The joining point 13 was a circle having a diameter of 3 mm. The arrangement pattern of the junction points 13 was a lattice pattern. The pitch of the junction points 13 was 20 mm in both the longitudinal direction X and the width direction Y. The total basis weight of the unopened short fiber bundle 20 ′ in the cleaning unit 12 was 155 g / m ² . In this way, a cleaning sheet 10 was obtained.

[Example 2]
A cleaning sheet 10 was obtained in the same manner as in Example 1 except that the fibers 21 used had a number of crimps of 22.32 and a crimp height of 0.32 mm.

Example 3
A cleaning sheet 10 was obtained in the same manner as in Example 1 except that a fiber 21 having a crimp number of 7.5 and a crimp height of 0.07 mm was used.

Example 4
A cleaning sheet 10 was obtained in the same manner as in Example 1 except that a fiber 21 having a crimp number of 22.86, a crimp height of 0.24 mm, and a fineness of 4.4 dtex was used.

Example 5
A cleaning sheet 10 shown in FIG. 10 was produced. The used fiber 21 and the spread fiber bundle 20 were the same as in Example 1. The length in the width direction Y of each of the first cleaning unit 12A and the second cleaning unit 12B in the opened state was 50 mm. The distance D between the first cleaning unit 12A and the second cleaning unit 12B in the opened state was 20 mm. The basis weight of each of the cleaning units 12A and 12B was 155 g / m ² . Except these, it carried out similarly to Example 1, and obtained the sheet | seat 10 for cleaning.

Example 6
In Example 5, the cleaning section was changed from two to three. The length in the width direction Y of each cleaning portion in the opened state was 30 mm. The distance between the cleaning parts in the opened state was 10 mm. The basis weight of each cleaning unit was 155 g / m ² . Except these, it carried out similarly to Example 5, and obtained the sheet | seat 10 for cleaning.

[Comparative Example 1]
A Quickle (registered trademark) dry sheet manufactured by Kao Corporation was used as Comparative Example 1.

[Evaluation]
About the sheet | seat for cleaning obtained in the Example and the comparative example, the thickness before the cleaning in a cleaning part was measured under 300 Pa load. The same measurement was performed after the fibers were opened by cleaning. The results are shown in Table 1. Moreover, about the cleaning sheet | seat obtained in the Example and the comparative example, it mounts | wears with the head part of the Quickle (registered trademark) wiper by Kao Corporation, and the following of the cleaning sheet with respect to various surfaces to be cleaned having irregularities The property and the collection property of garbage were evaluated by the following methods. The results are shown in Table 1. As a surface to be cleaned, (a) wooden floor groove (National KER7UE V groove depth 1 mm, width 2 mm), (b) tatami mat, (c) vertical surface (baseboard portion in the room: National QPL113T39) ), (D) Sill (groove depth 4 mm, width 21 mm), (e) Sliding door rail barrier free type groove depth 2 mm, width 5.3 mm), (f) Side surface of door stopper Hook type MJT107 manufactured by National ), (G) Frame under the door (height 15 mm, width 30 mm) and (h) Stair stopper (Skawars height 3.9 mm, width 39.5 mm, manufactured by Kawaguchi Giken Co., Ltd.). Weigh out 0.02 g of model dust “Cotton linter diameter 10 μm under length 0.5 mm under” manufactured by IWAMOTO MINALAL Co. LTD, and spread it on various surfaces to be cleaned with irregularities with a sieve having openings of 300 μm. The cleaning sheet is attached to the head part of a Quickle (registered trademark) wiper manufactured by Kao Corporation, and is wiped back and forth twice so as to follow the cleaning surface. After the wiping, the determination was made by visually observing the uneven portion of the cleaning surface and the model dust remaining around the uneven portion.
The evaluation criteria are as follows.
・ Followability ◎: Does not remain on the uneven portion ○: Remains within about 1/4 of the sprayed amount on the uneven portion Δ: Remains within about 1/2 of the sprayed amount on the uneven portion ×: About 1 of the sprayed amount on the uneven portion / More than 2 remains / collectability ◎: Does not remain in the peripheral part including the uneven part ○: Less than about ¼ of the sprayed amount remains in the peripheral part including the uneven part Δ: The peripheral part including the uneven part Less than about 1/2 of the spraying amount remains in X: More than about 1/2 of the spraying amount remains in the periphery including the uneven portion

  As is clear from the results shown in Table 1, it can be seen that the cleaning sheet of each example has a small thickness before cleaning, but the fibers are opened and become bulky by cleaning. Moreover, it turns out that the cleaning sheet | seat of each Example is excellent in the followable | trackability to an uneven surface, and is a thing with high collection property of refuse compared with the cleaning sheet | seat of a comparative example.

FIG. 1 is a perspective view showing a first embodiment of the cleaning sheet of the present invention. FIG. 2 is a perspective view showing an example of an unopened short fiber bundle and an opened fiber bundle in an ideal opened state. FIG. 3 is a perspective view showing one usage pattern of the cleaning sheet shown in FIG. 1. Fig.4 (a) is a perspective view which shows the state by which the fiber of the unopened short fiber bundle in the cleaning sheet | seat shown in FIG. 1 was opened, FIG.4 (b) is bb- in Fig.4 (a). It is line sectional drawing. FIG. 5 is a schematic diagram showing an apparatus for manufacturing an unopened short fiber bundle. 6 (a) to 6 (d) are schematic views sequentially showing the production process of unopened short fiber bundles. FIG. 7 (a) is a schematic view showing another production apparatus for unopened short fiber bundles, and FIG. 7 (b) shows a process of producing an unopened short fiber bundle using the production apparatus shown in FIG. 7 (a). It is a schematic diagram which shows a part. FIG. 8 is a schematic diagram illustrating a cleaning device for a cleaning sheet. FIG. 9 is a perspective view (corresponding to FIG. 1) showing a second embodiment of the cleaning sheet of the present invention. FIG. 10 is a perspective view (corresponding to FIG. 1) showing a third embodiment of the cleaning sheet of the present invention. FIG. 11 is a perspective view (corresponding to FIG. 1) showing a fourth embodiment of the cleaning sheet of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cleaning sheet 11 Base material sheet 12 Cleaning part 20 Open fiber bundle 20 'Unopened short fiber bundle 21 Fiber 22 Joint part

Claims (8)

A plurality of unopened short fiber bundles formed by joining a plurality of fibers arranged in one direction to each other by a joint extending in a direction crossing the extending direction of the fibers are joined to at least one surface of the base sheet and cleaned. Part is formed,
A cleaning sheet in which fibers extending from the joint in the unopened short fiber bundle are opened by wiping the surface to be cleaned by the cleaning unit.   The cleaning sheet according to claim 1, wherein in the unopened short fiber bundle, the joint portion is formed in a substantially central region in the longitudinal direction of the fiber.   The cleaning sheet according to claim 1, wherein the fibers have crimps.   The fiber sheet according to any one of claims 1 to 3, wherein the base sheet includes a net.   The cleaning sheet according to any one of claims 1 to 4, wherein the cleaning sheet is used by being mounted on the head portion of a cleaning tool having a head portion and a handle connected to the head portion, using the base sheet. . A method for producing the cleaning sheet according to claim 1,
A plurality of continuous long fibers arranged in one direction are joined together by a plurality of joints extending in a direction intersecting with the extending direction of the fibers to form a continuous long fiber bundle,
The continuous long fiber bundle is cut between the joints to obtain an unopened short fiber bundle,
The manufacturing method of the sheet | seat for cleaning which joins the said some unopened short fiber bundle to at least one surface of a base material sheet.   An unopened short fiber bundle used as a cleaning portion of a cleaning sheet, wherein a plurality of fibers arranged in one direction are joined to each other by a joint portion extending in a direction intersecting with the direction in which the fibers extend. A method for producing a massive unopened short fiber bundle according to claim 7,
A plurality of continuous long fibers arranged in one direction are joined together by a plurality of joints extending in a direction intersecting with the extending direction of the fibers to form a continuous long fiber bundle,
The manufacturing method of the unopened short fiber bundle which cut | disconnects the said continuous long fiber bundle between the said junction parts, and obtains an unopened short fiber bundle.

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