EP2623011A1 - Cleaning sheet and cleaning implement - Google Patents
Cleaning sheet and cleaning implement Download PDFInfo
- Publication number
- EP2623011A1 EP2623011A1 EP11828965.1A EP11828965A EP2623011A1 EP 2623011 A1 EP2623011 A1 EP 2623011A1 EP 11828965 A EP11828965 A EP 11828965A EP 2623011 A1 EP2623011 A1 EP 2623011A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- cleaning
- outer layer
- elongation rate
- cleaning sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L13/00—Implements for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L13/10—Scrubbing; Scouring; Cleaning; Polishing
- A47L13/16—Cloths; Pads; Sponges
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L13/00—Implements for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L13/10—Scrubbing; Scouring; Cleaning; Polishing
- A47L13/20—Mops
- A47L13/24—Frames for mops; Mop heads
- A47L13/254—Plate frames
- A47L13/256—Plate frames for mops made of cloth
Definitions
- the invention relates to a cleaning sheet and a cleaning tool, and more particularly to a cleaning sheet and a cleaning tool which can be suitably used for wiping an object to be cleaned, such as floor.
- Japanese non-examined laid-open Patent Publication No. 2007-20615 discloses a cleaning sheet having an inner layer sheet and outer layer sheets integrally formed with the inner layer sheet on both sides of the inner layer sheet.
- the cleaning sheet can be attached to a cleaning sheet mounting member of a cleaning tool.
- a central portion of the cleaning sheet is placed on a cleaning part of the cleaning sheet mounting member. Both ends of the cleaning sheet are pushed in through holding members of the cleaning sheet mounting member and held between the holding members.
- the known cleaning sheet has a loosely entangled portion in its central portion and a tightly entangled portion in its both end portions.
- the end portions of the cleaning sheet are designed to have a higher elongation rate or lower rigidity in order to prevent the cleaning sheet from becoming detached, the end portions of the cleaning sheet held by the holding members are easily damaged by tensile stress. Therefore, it is difficult to secure reliable holding of the cleaning sheet and resistance to damage in a balanced manner. Accordingly, it is an object of the invention to provide a technique for improving usability of the cleaning sheet and the cleaning tool.
- a cleaning sheet which can be attached to a cleaning sheet mounting member.
- This cleaning sheet is preferably formed of nonwoven fabric.
- the cleaning sheet according to this invention has a central portion forming a cleaning side and at least one end portion formed on at least one side of the central portion along one predetermined direction.
- the end portion may be formed along one direction on only one side of the central portion, or it may be formed on both sides of the central portion.
- the end portion has a first part having a predetermined first elongation rate and a second part having a predetermined second elongation rate higher than the first part.
- the second part is formed between the first part and the central portion along the above-described one direction.
- a boundary between the first and second parts is removably held by the cleaning sheet mounting member. It is essential for the boundary to be held at least in part.
- the "elongation rate (mm/N) of the cleaning sheet” is a measure of stretchiness of the cleaning sheet. The higher the elongation rate, the stretchier the sheet.
- Various methods can be used to change the elongation rates of the first and second parts. For example, a method of changing the number of thicknesses of the sheet elements in the first and second parts, a method of changing the entangled state of fibers in the first and second parts, or a method of changing the constitution of raw cotton in the first and second parts can be used.
- the first portion having a lower elongation rate (less stretchy) is held caught by the cleaning sheet mounting member due to its own rigidity without being damaged by the tensile stress.
- the second part having a higher elongation rate (more stretchy) stretches and thus effectively absorbs the tensile stress. As a result, the cleaning sheet can be prevented from becoming detached from the cleaning sheet mounting member during cleaning operation.
- the elongation rates of the first and second parts are changed according to the number of thicknesses of the sheet elements in the first and second parts.
- the second part having a higher elongation rate may be formed by a single sheet element, or it may be formed by several thicknesses of sheet elements.
- the second part formed by a single sheet element can be referred to as the "second part having the sheet element in a single layer".
- the first part having a lower elongation rate is formed by a larger number of thicknesses of sheet elements than the sheet elements of the second part.
- a method of layering sheet elements a method of overlaying different sheet elements one on another or a method of folding one sheet element can be used.
- the layered sheet elements are preferably bonded together.
- Various methods can be used as the bonding method.
- the first and second parts are different in the number of thicknesses of the sheet elements, so that it can be easy to visually check the boundary between the first and second parts.
- the operation of holding the boundary by the holding member is easily performed.
- the cleaning sheet in which the end portion has the first and second parts having different elongation rates can be manufactured at lower cost.
- the layered sheet elements in the first part of the end portion are bonded together by embossing.
- the sheet elements containing thermoplastic fibers are overlaid one on another and bonded together by hot embossing.
- Various kinds of sheet elements can be used as the sheet elements containing thermoplastic fibers. In this embodiment, the elongation rates of the first and second parts can be more easily changed.
- the end portion has a third part having a lower elongation rate than the second part.
- the third part is formed between the second part and the central portion along the one direction.
- the third part may have the same elongation rate as the first part, or it may have a different elongation rate from the first part.
- the strength of the central portion side can be maintained, while the cleaning sheet can be prevented from becoming detached from the cleaning sheet mounting member.
- the head 110, the handle 150 and the pipe 13 0 are features that correspond to the "cleaning sheet mounting member", the “holding member” and the “connecting member for connecting the head and the handle", respectively, according to this invention.
- the number of the pipe elements 133 forming the pipe 130 can be appropriately selected.
- the handle 150 may also be directly connected to the connecting mechanism 131 provided on the head 110.
- the head 110 is shaped like a plate as shown in FIG. 2 and has an upper side 112 on which the connecting mechanism 131 is mounted, and a lower side (mounting side or cleaning part) 111 (see FIG. 10 ) opposite to the upper side 112.
- Holding members 120 are provided on the upper side 112.
- each of the holding members 120 has a plurality of elastic holding pieces 121 which are defined by cuts.
- the cleaning sheet 200 has a central portion 200b and end portions 200a, 200c provided on both sides of the central portion 200b, which will be described below in detail.
- the central portion 200b forms a main cleaning side of the cleaning sheet 200.
- the cleaning sheet 200 has a three-layer structure having a single inner layer sheet 210 and single outer layer sheets 220, 230 disposed on the both sides of the inner layer sheet 210.
- the "cleaning sheet having a three-layer structure” here includes not only a cleaning sheet having a three-layer structure across its entire region, but a cleaning sheet having a three-layer structure in its main region (e.g. the central portion 200b) and not having a three-layer structure (e.g. having a single- or two-layer structure) in the other regions. This is also true for multi-layer structures other than the three-layer structure.
- a hydrophilic nonwoven fabric sheet is used as the inner layer sheet 210. It is essential for the hydrophilic nonwoven fabric sheet to be hydrophilic as a whole, and the nonwoven fabric sheet may be formed of hydrophilic fibers and hydrophobic fibers.
- the hydrophilic fibers include rayon fibers, cotton fibers and pulp fibers. In this embodiment, the nonwoven fabric sheet is formed only of rayon fiber having high water absorbency and high moisture retentivity.
- the inner layer sheet 210 is a feature that corresponds to the "impregnated element", the "third nonwoven fabric sheet” or the "third sheet” according to this invention.
- a nonwoven fabric sheet (spun lace nonwoven fabric sheet) manufactured by a water jet method (hydroentangling method) is used as the inner layer sheet 210.
- spun lace nonwoven fabric of intertlaced fibers is manufactured by jetting high-pressure water, for example, onto a web of randomly arranged fibers from a plurality of nozzles disposed in an orientation transverse to the direction of feed of the web.
- each of the nozzles for jetting high-pressure water has orifices having a diameter of 92 ⁇ m and continuously arranged over the width of 2.0 mm and such nozzles are arranged at intervals (orifice pitches) of 3.0 mm.
- the outer layer sheet 220 (230) has a two-layer structure having a layer (inner layer) 222 (232) facing the inner layer sheet 210, and a layer (outer layer) 221 (231) on the opposite side from the side facing the inner layer sheet 210.
- the outer layer sheets 220, 230 are formed of fibers mainly consisting of thermoplastic fibers.
- Thermoplastic fibers forming the inner layers 222, 232 have a lower melting point than thermoplastic fibers forming the outer layers 221, 231.
- the outer layers 221, 231 consist, for example, of thermoplastic fibers of polyethylene terephthalate (PET) in major proportions and the rest are rayon fibers.
- the compounding ratio of polyethylene (PE) fibers/polyethylene terephthalate (PET) fibers and rayon fibers is 70 % by weight: 30 % by weight.
- the basis weight of the outer layer sheets 220, 230 is preferably set within the range of 35 to 40 gsm from the viewpoints of the functionality, productivity, costs, etc., though, if it exceeds 3 0 gsm, there is no particular problem from the viewpoints of the amount of release of the cleaning solution.
- the inner layer sheet 210 and the outer layer sheets 220, 230 can be bonded together by the thermoplastic fibers having a lower melting point which are contained in the inner layer 222 of the outer layer sheet 220 and the inner layer 232 of the outer layer sheet 230.
- each of the ends of the cleaning sheet has a first part having a first elongation rate and a second part having an elongation rate higher than the first elongation rate.
- the second part is disposed on the central portion side of the first part, and a boundary between the first and second parts is formed at a position such that it can be held by the holding members 120 of the head 110 of the cleaning tool.
- FIG. 4 is a sectional view taken along line IV-IV in FIG. 3 .
- the cleaning sheet 200 has a rectangular shape having a width M (e.g. 205 mm) and a length S (e.g. 275 mm).
- the inner layer sheet 210 has a rectangular shape having a width N (e.g. 90 mm) and the length S.
- the outer layer sheets 220, 230 have a rectangular shape having a width (e.g. 190 mm) shorter than the width M and the length S.
- the outer layer sheet 220 (230) has a base 220c (230c) and a folded part 220a (230a) having a predetermined fold length from its one edge in the width direction.
- the folded part 220a (230a) is folded over to the inner layer 222 (232) side along a folding line 220b (230b) and overlaid on part of the base 220c (230c).
- the outer layer sheets 220, 230 having the respective folded parts 220a, 230a are arranged on the both sides of the inner layer sheet 210.
- the inner layer 222 of the outer layer sheet 220 and the inner layer 232 of the outer layer sheet 230 are arranged on the inner layer sheet 210 side (so as to be opposed to each other). Further, the inner layer sheet 210 is centrally located in the direction of the width M (the vertical direction as viewed in FIG. 3 and the horizontal direction as viewed in FIG.4 ).
- the folded parts 220a, 230a of the outer layer sheets 220, 230 are arranged on the opposite sides of the inner layer sheet 210 in the width direction. Further, the folding lines 201, 202 are provided in the cleaning sheet 200 toward the center in the width direction and spaced a distance R apart from each other which is equal to or longer than the width N of the inner layer sheet 210 (R ⁇ N).
- the cleaning sheet 200 is divided into the centrally located central portion 200b and the end portions 200a, 200c provided on the both sides of the central portion 200b in the width direction by the folding lines 201, 202.
- the end portion 200a (200c) has, from one end (the other end) in the width direction, a first part 200a1 (200c1) of a two-layer structure having the folded part 220a (230a) and part of the base 220c (230c) of the outer layer sheet 220 (230), a second part 200a2 (200c2) of a single-layer structure having the base 220c (230c) of the outer layer sheet 220 (230), and a third part 200a3 (200c3) of a two-layer structure having the base 220c of the outer layer sheet 220 and the base 230c of the outer layer sheet 230.
- the central portion 200b has a three-layer structure having the base 220c of the outer layer sheet 220, the base 230c of the outer layer sheet 230 and the inner layer sheet 210.
- the folding lines 201, 202 serve as guides for positioning the central portion 200b of the cleaning sheet 200 such that it faces the lower side (cleaning part) 111 of the head 110 when the cleaning sheet 200 is attached to the head 110 of the cleaning tool 100.
- a width R of the central portion 200b of the cleaning sheet 200 (distance between the folding lines 201, 202) is preferably equal to or longer than a width W of the lower side (cleaning part) 111 of the head 110 of the cleaning tool 100 (R ⁇ W).
- the width N of the inner layer sheet 210 is preferably equal to or shorter than the width W of the lower side (cleaning part) 111 of the head 110 of the cleaning tool 100 (N ⁇ W).
- the relationship between the distance R, the width N and the width W is not limited to this.
- FIG. 6 is a sectional view taken along line VI-VI in FIG. 5 .
- the inner layer sheet 210 is bonded to the outer layer sheets 220, 230 on edges (ends) of the outer layer sheets 220, 230 in the length direction (the horizontal direction as viewed in FIG. 5 ).
- the bonding area of bonding the inner layer sheet 210 and the outer layer sheets 220, 230 is located away from the center of an area (main cleaning area) of the cleaning sheet which is used for normal cleaning operation.
- a hot embossing method is used for the bonding.
- hot embossed portions 203 are formed on the edges of the outer layer sheets 220, 230 on the both ends in the length direction.
- the hot embossed portions 203 and bonded portions 203a in which the inner layer sheet 210 is bonded to the outer layer sheets 220,230 are formed by hot embossing the outer layer sheets 220, 230.
- the outer layer sheets 220, 230 are formed of fibers containing thermoplastic fibers.
- hot embossing for bonding the outer layer sheets 220, 230 in the third parts 200a3, 200c3 is referred to as the "second hot embossing".
- first hot embossing only the edges of the inner layer sheet 210 on the both ends in the length direction are subjected to first hot embossing, but the edges of the third parts 200a3, 200c3 on the both ends in the length direction may also be subjected to first hot embossing.
- the cleaning sheet 200 may be formed by using the inner layer sheet 210 which is impregnated with the cleaning solution in advance.
- the cleaning solution may be applied to the central portion 200b of the outer layer sheets 220, 230 so that the inner layer sheet 210 is impregnated with the cleaning solution via the outer layer sheets 220, 230.
- FIG. 10 shows the cleaning sheet 200 in this embodiment which is attached to the head 110.
- FIG. 10 is a sectional view taken along line X-X (in the width direction) in FIG. 2 .
- the central portion 200b of the cleaning sheet 200 is located to face the lower side (cleaning part) 111 of the head 110.
- the end portions 200a, 200c of the cleaning sheet 200 are folded over along the folding lines 201, 202 and placed on the upper side 112 of the head 110.
- the length of the first parts 200a1, 200c1 (the length of the folded parts 220a, 230a) is set to 20 mm.
- the first parts 200a1, 200c1 are located inward of the second parts 200a2, 200c2 or toward the center in the width direction (on the opposite side from the central portion 200b) and held by the holding pieces 121.
- part of the boundary 200P1 (200Q1) between the first part 200a1 (200c1) having a lower elongation rate and the second part 200a2 (200c2) having a higher elongation rate is caught by the holding pieces 121 facing each other.
- a point of change in the elongation rate of the sheet is held by the holding pieces 121.
- the cleaning sheet 200 can be easily detached from the head 110.
- the second part 200a2 (200c2) having a higher elongation rate is designed as a single-layer structure and the first part 200a1 (200c1) having a lower elongation rate as a two-layer structure.
- the cleaning tool having the first part 200a1 (200c1) and the second part 200a2 (200c2) which are different in elongation rate can be easily manufactured at lower costs.
- part of the boundary Z between the first member X having a lower elongation rate and the second member Y having a higher elongation rate is held by the holding pieces 121, so that the second member Y having the higher elongation rate becomes stretchy and can effectively absorb the tensile stress.
- part of the boundary Z between the first member X and the second member Y is kept held by the holding pieces 121.
- the boundary Z between the first member X and the second member Y is pulled out through the holding pieces 121.
- the end portion 200a (200c) of the cleaning sheet 200 is detached from the holding pieces 121.
- the end portion 200a (200c) of the cleaning sheet 200 can be easily detached from the holding pieces 121.
- each of the ends of the cleaning sheet has a first part having a lower elongation rate and a second part having a higher elongation rate and the second part is disposed on the central portion side of the first part. The boundary between the first part and the second part is held by the holding pieces.
- the property of releasing the cleaning solution from the impregnated element to the outer layer sheets is determined by the amount of cleaning solution which can be impregnated into the impregnated element, or the amount of cleaning solution which is released from the impregnated element to the outer layer sheets.
- a space may be provided between the impregnated element and the outer layer sheets, or a fusion bonded layer may be formed on the inner sides of the outer layer sheets (facing the impregnated element).
- a method for controlling the property of releasing cleaning solution from the impregnated element to the outer layer sheets is used.
- the above-described cleaning sheet may also be used singly (without being mounted to the cleaning sheet mounting member of the cleaning tool) to clean an object to be cleaned.
- the cleaning sheet or the cleaning tool of this invention can be used to clean objects having various shapes, such as planar, curved, uneven or stepped shape.
- the cleaning sheet may also be designed to be used in a dry state to clean an object to be cleaned.
Abstract
Description
- The invention relates to a cleaning sheet and a cleaning tool, and more particularly to a cleaning sheet and a cleaning tool which can be suitably used for wiping an object to be cleaned, such as floor.
- Various cleaning sheets for wiping an object to be cleaned are known. For example, Japanese non-examined laid-open Patent Publication No.
2007-20615 - In this case, a central portion of the cleaning sheet is placed on a cleaning part of the cleaning sheet mounting member. Both ends of the cleaning sheet are pushed in through holding members of the cleaning sheet mounting member and held between the holding members. The known cleaning sheet has a loosely entangled portion in its central portion and a tightly entangled portion in its both end portions.
- In operation of cleaning floor or other objects having a high frictional resistance, with a cleaning sheet attached to a cleaning sheet mounting member of a cleaning tool, a tensile stress acts upon the cleaning sheet in a direction opposite to the direction of movement of the cleaning sheet mounting member. In the known cleaning sheet, the loosely entangled portion is formed in its central portion, but each of the end portions of the sheet has a substantially uniform elongation rate across its entire region. Therefore, when a tensile stress acts upon the cleaning sheet during cleaning operation, if the end portions of the cleaning sheet has a lower elongation rate or higher rigidity, the end portions of the cleaning sheet easily become detached from the holding members. On the other hand, if the end portions of the cleaning sheet are designed to have a higher elongation rate or lower rigidity in order to prevent the cleaning sheet from becoming detached, the end portions of the cleaning sheet held by the holding members are easily damaged by tensile stress. Therefore, it is difficult to secure reliable holding of the cleaning sheet and resistance to damage in a balanced manner.
Accordingly, it is an object of the invention to provide a technique for improving usability of the cleaning sheet and the cleaning tool. - The above-described problem can be solved by the the claimed invention. According to this invention, a cleaning sheet which can be attached to a cleaning sheet mounting member is provided. This cleaning sheet is preferably formed of nonwoven fabric. The cleaning sheet according to this invention has a central portion forming a cleaning side and at least one end portion formed on at least one side of the central portion along one predetermined direction. The end portion may be formed along one direction on only one side of the central portion, or it may be formed on both sides of the central portion. The end portion has a first part having a predetermined first elongation rate and a second part having a predetermined second elongation rate higher than the first part. The second part is formed between the first part and the central portion along the above-described one direction. A boundary between the first and second parts is removably held by the cleaning sheet mounting member. It is essential for the boundary to be held at least in part.
- The "elongation rate (mm/N) of the cleaning sheet" is a measure of stretchiness of the cleaning sheet. The higher the elongation rate, the stretchier the sheet.
Various methods can be used to change the elongation rates of the first and second parts. For example, a method of changing the number of thicknesses of the sheet elements in the first and second parts, a method of changing the entangled state of fibers in the first and second parts, or a method of changing the constitution of raw cotton in the first and second parts can be used. - With this construction, in this invention, when a tensile stress acts upon the cleaning sheet attached to the cleaning sheet mounting member during cleaning operation, the first portion having a lower elongation rate (less stretchy) is held caught by the cleaning sheet mounting member due to its own rigidity without being damaged by the tensile stress. On the other hand, the second part having a higher elongation rate (more stretchy) stretches and thus effectively absorbs the tensile stress. As a result, the cleaning sheet can be prevented from becoming detached from the cleaning sheet mounting member during cleaning operation.
- In another embodiment of the invention, the elongation rates of the first and second parts are changed according to the number of thicknesses of the sheet elements in the first and second parts. In this case, the second part having a higher elongation rate may be formed by a single sheet element, or it may be formed by several thicknesses of sheet elements. The second part formed by a single sheet element can be referred to as the "second part having the sheet element in a single layer". Further, the first part having a lower elongation rate is formed by a larger number of thicknesses of sheet elements than the sheet elements of the second part. As a method of layering sheet elements, a method of overlaying different sheet elements one on another or a method of folding one sheet element can be used. The layered sheet elements are preferably bonded together. Various methods can be used as the bonding method.
In this embodiment, the first and second parts are different in the number of thicknesses of the sheet elements, so that it can be easy to visually check the boundary between the first and second parts. Thus, the operation of holding the boundary by the holding member is easily performed. Further, the cleaning sheet in which the end portion has the first and second parts having different elongation rates can be manufactured at lower cost. - In a further embodiment of the invention, the layered sheet elements in the first part of the end portion are bonded together by embossing. Preferably, the sheet elements containing thermoplastic fibers are overlaid one on another and bonded together by hot embossing. Various kinds of sheet elements can be used as the sheet elements containing thermoplastic fibers.
In this embodiment, the elongation rates of the first and second parts can be more easily changed. - In a further embodiment of the invention, the end portion has a third part having a lower elongation rate than the second part. The third part is formed between the second part and the central portion along the one direction. The third part may have the same elongation rate as the first part, or it may have a different elongation rate from the first part.
In this embodiment, with the construction in which the third part having a lower elongation rate than the second part is disposed on the central portion side of the second part, the strength of the central portion side can be maintained, while the cleaning sheet can be prevented from becoming detached from the cleaning sheet mounting member. - In a further embodiment of the invention, a cleaning tool having the cleaning sheet and the cleaning sheet mounting member as described above can be provided.
Further, in a further embodiment of the invention, the holding member has a plurality of elastic holding pieces which are opposed to each other, and the boundary of the cleaning sheet is pushed in through the holding member between the holding pieces and caught by the holding pieces. In this manner, the boundary is held by the holding member. - According to this invention, a cleaning sheet or a cleaning tool is provided which is improved in usability. Other objects, features and advantages of this invention will be readily understood after reading the following detailed description together with the accompanying drawings and the claims.
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FIG. 1 is a perspective view showing an embodiment of a cleaning tool. -
FIG. 2 is a plan view of a head. -
FIG. 3 shows a schematic structure of acleaning sheet 200 according to one embodiment. -
FIG. 4 is a sectional view taken along line IV-IV inFIG. 3 . -
FIG. 5 shows thecleaning sheet 200 of the one embodiment in the unfolded state. -
FIG. 6 is a sectional view taken along line VI-VI inFIG. 5 . -
FIG. 7 is a sectional view taken along line VII-VII inFIG. 5 . -
FIG. 8 is a sectional view taken along line VIII-VIII inFIG. 5 . -
FIG. 9 is a sectional view taken along line IX-IX inFIG. 5 . -
FIG. 10 is a sectional view taken along line X-X inFIG. 2 . -
FIG. 11 is a view for illustrating operation of this invention. -
FIG. 12 shows the schematic construction ofembodiment 1. -
FIG. 13 shows the schematic construction ofembodiments -
FIG. 14 shows the schematic construction of embodiment 4. -
FIG. 15 shows the schematic construction of comparative example 1. -
FIG. 16 shows the schematic construction of comparative examples 2 and 3. -
FIG. 17 shows the schematic construction of comparative examples 4 to 6. -
FIG. 18 shows the schematic construction of comparative example 7. - Each of the additional features and method steps disclosed above and below may be utilized separately or in conjunction with other features and method steps to provide improved cleaning sheets or cleaning tools and components utilized therein. Representative examples of the invention, which examples utilized many of these additional features and method steps in conjunction, will now be described in detail with reference to the drawings. This detailed description is merely intended to teach a person skilled in the art further details for practicing preferred aspects of the present teachings and is not intended to limit the scope of the invention. Only the claims defme the scope of the claimed invention. Therefore, combinations of features and steps disclosed within the following detailed description may not be necessary to practice the invention in the broadest sense, and are instead taught merely to particularly describe some representative examples of the invention, which detailed description will now be given with reference to the accompanying drawings.
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FIG. 1 is a perspective view showing an embodiment of acleaning tool 100 according to this invention. Thecleaning tool 100 of this embodiment has ahead 100 to which acleaning sheet 200 is attached, apipe 130 and ahandle 150. Thepipe 130 is formed by coupling a plurality ofpipe elements 133 via coupling mechanisms. Each of the coupling mechanisms includes, for example, a male coupling element provided on one end of one pipe element and a female coupling element provided on the other end of the other pipe element. The connection between the male coupling element and the female coupling element is covered with acover 132. The one end of thepipe 130 is connected to thehandle 150. The other end of thepipe 130 is connected to a connectingmechanism 131 provided on thehead 110. In this embodiment, thehead 110, thehandle 150 and the pipe 13 0 are features that correspond to the "cleaning sheet mounting member", the "holding member" and the "connecting member for connecting the head and the handle", respectively, according to this invention. The number of thepipe elements 133 forming thepipe 130 can be appropriately selected. Further, thehandle 150 may also be directly connected to the connectingmechanism 131 provided on thehead 110. - The
head 110 is shaped like a plate as shown inFIG. 2 and has anupper side 112 on which the connectingmechanism 131 is mounted, and a lower side (mounting side or cleaning part) 111 (seeFIG. 10 ) opposite to theupper side 112. Holdingmembers 120 are provided on theupper side 112. As shown inFIG. 2 , each of the holdingmembers 120 has a plurality of elastic holdingpieces 121 which are defined by cuts.
As shown inFIGS. 5 and 6 , thecleaning sheet 200 has acentral portion 200b andend portions central portion 200b, which will be described below in detail. Thecentral portion 200b forms a main cleaning side of thecleaning sheet 200. Further, theend portion 200c forms a mounting portion which is mounted to the cleaning sheet mounting member (the head 110).
Thecentral portion 200b of thecleaning sheet 200 is placed to face the lower side (mounting side or cleaning part) 111 of thehead 110, and theend portions upper side 112. Specifically, thecleaning sheet 200 is attached to thehead 110 such that thehead 110 is covered with thecentral portion 200b and theend portions end portions cleaning sheet 200 are placed on theupper side 112, points of theend portions end portions cleaning sheet 200 are caught in part and removably held between the adjacent holding pieces 121. - In a cleaning operation using the
cleaning tool 100 of this embodiment, generally, thehead 110 is moved in a direction (the vertical direction as viewed inFIG. 2 ) transverse to a direction along a boundary (e.g. folding lines central portion 200b and theend portion head 110 can also be moved in the other directions. - An embodiment of a
cleaning sheet 200 for use with thecleaning tool 100 of this embodiment is now explained.
As shown inFIG. 4 , thecleaning sheet 200 has a three-layer structure having a singleinner layer sheet 210 and singleouter layer sheets inner layer sheet 210. The "cleaning sheet having a three-layer structure" here includes not only a cleaning sheet having a three-layer structure across its entire region, but a cleaning sheet having a three-layer structure in its main region (e.g. thecentral portion 200b) and not having a three-layer structure (e.g. having a single- or two-layer structure) in the other regions. This is also true for multi-layer structures other than the three-layer structure. - A hydrophilic nonwoven fabric sheet is used as the
inner layer sheet 210. It is essential for the hydrophilic nonwoven fabric sheet to be hydrophilic as a whole, and the nonwoven fabric sheet may be formed of hydrophilic fibers and hydrophobic fibers. The hydrophilic fibers include rayon fibers, cotton fibers and pulp fibers. In this embodiment, the nonwoven fabric sheet is formed only of rayon fiber having high water absorbency and high moisture retentivity. Theinner layer sheet 210 is a feature that corresponds to the "impregnated element", the "third nonwoven fabric sheet" or the "third sheet" according to this invention.
A nonwoven fabric sheet (spun lace nonwoven fabric sheet) manufactured by a water jet method (hydroentangling method) is used as theinner layer sheet 210. In the water jet method, spun lace nonwoven fabric of intertlaced fibers is manufactured by jetting high-pressure water, for example, onto a web of randomly arranged fibers from a plurality of nozzles disposed in an orientation transverse to the direction of feed of the web. In this embodiment, each of the nozzles for jetting high-pressure water has orifices having a diameter of 92µm and continuously arranged over the width of 2.0 mm and such nozzles are arranged at intervals (orifice pitches) of 3.0 mm. By using such nozzles, air-through portions are formed in the spun lace nonwoven fabric, and a striped pattern appears on a finished spun lace nonwoven fabric. Thus, the specific volume ratio of theinner layer sheet 210 increases, so that the amount of impregnation (the amount of water retention) of theinner layer sheet 210 increases. The striped pattern is a feature that corresponds to the pattern of the "patterned indented surface of the inner layer sheet" according to this invention. The orifice pitch (interval of indentations) is set within the range of 2.0 to 10.0 mm, or more suitably, within the range of 2.0 to 3.0 mm. If the orifice pitch exceeds 10.0 mm, fibers are more loosely entangled with each other, so that fluff loss of fibers increases. Further, the strength decreases, so that it becomes difficult to form the nonwoven fabric sheet only of hydrophilic fibers. Theinner layer sheet 210 may also include nonwoven fabric sheets manufactured by other methods, such as through-air bonding, spun bonding, thermal bonding, point bonding, melt blowing, chemical bonding and air-laid methods.
The basis weight of theinner layer sheet 210 is preferably set within the range of 40 to 70 gsm from the viewpoint of the amount of release of the cleaning solution, but it may exceed 70 gsm. - A hydrophobic nonwoven fabric sheet is used as the
outer layer sheets outer layer sheets
Further, in this embodiment, a spun lace nonwoven fabric sheet manufactured by a water jet method (hydroentangling method) is used as theouter layer sheets outer layer sheets - In the
cleaning sheet 200 of this embodiment, as shown inFIG. 4 , the outer layer sheet 220 (230) has a two-layer structure having a layer (inner layer) 222 (232) facing theinner layer sheet 210, and a layer (outer layer) 221 (231) on the opposite side from the side facing theinner layer sheet 210.
In this embodiment, theouter layer sheets inner layers outer layers
Theouter layers
As the thermoplastic fibers forming theinner layers
The basis weight of theouter layer sheets - By thus forming the
inner layers outer layer sheets outer layers inner layer sheet 210 contains no thermoplastic fibers, theinner layer sheet 210 and theouter layer sheets inner layer 222 of theouter layer sheet 220 and theinner layer 232 of theouter layer sheet 230.
When the outer layer sheet 220 (230) having the inner layer 222 (232) and the outer layer 221 (231) is heated at a temperature which is higher than the melting point of the thermoplastic fibers of the inner layer 222 (232) and lower than the melting point of the thermoplastic fibers of the outer layer 221 (231), a fusion bonded layer is formed in the inner layer 222 (232). As a result, most of the fibers in the inner layer 222 (232) of the outer layer sheet 220 (230) are joined together by fusion bonding, so that the amount of the cleaning solution which is released from theinner layer sheet 210 to the outer layer sheet 220 (230) is controlled. - As described above, the known cleaning sheet has a loosely entangled portion in its central portion, but each of its end portions has a substantially uniform elongation rate across its entire region. Therefore, during cleaning operation which is performed with the end portions of the cleaning sheet held by the holding members of the head of the cleaning tool, the cleaning sheet easily becomes detached from the holding members.
Therefore, in this invention, each of the ends of the cleaning sheet has a first part having a first elongation rate and a second part having an elongation rate higher than the first elongation rate. The second part is disposed on the central portion side of the first part, and a boundary between the first and second parts is formed at a position such that it can be held by the holdingmembers 120 of thehead 110 of the cleaning tool. - The
inner layer sheet 210 and theouter layer sheets FIGS. 3 and 4. FIG. 4 is a sectional view taken along line IV-IV inFIG. 3 .
As shown inFIG. 3 , thecleaning sheet 200 has a rectangular shape having a width M (e.g. 205 mm) and a length S (e.g. 275 mm). Theinner layer sheet 210 has a rectangular shape having a width N (e.g. 90 mm) and the length S. Theouter layer sheets
The outer layer sheet 220 (230) has abase 220c (230c) and a foldedpart 220a (230a) having a predetermined fold length from its one edge in the width direction. The foldedpart 220a (230a) is folded over to the inner layer 222 (232) side along afolding line 220b (230b) and overlaid on part of thebase 220c (230c). As shown inFIG. 4 , theouter layer sheets parts inner layer sheet 210. At this time, theinner layer 222 of theouter layer sheet 220 and theinner layer 232 of theouter layer sheet 230 are arranged on theinner layer sheet 210 side (so as to be opposed to each other). Further, theinner layer sheet 210 is centrally located in the direction of the width M (the vertical direction as viewed inFIG. 3 and the horizontal direction as viewed inFIG.4 ). The foldedparts outer layer sheets inner layer sheet 210 in the width direction. Further, thefolding lines cleaning sheet 200 toward the center in the width direction and spaced a distance R apart from each other which is equal to or longer than the width N of the inner layer sheet 210 (R ≧ N).
Thus, as shown inFIG. 3 , thecleaning sheet 200 is divided into the centrally locatedcentral portion 200b and theend portions central portion 200b in the width direction by thefolding lines end portion 200a (200c) has, from one end (the other end) in the width direction, a first part 200a1 (200c1) of a two-layer structure having the foldedpart 220a (230a) and part of thebase 220c (230c) of the outer layer sheet 220 (230), a second part 200a2 (200c2) of a single-layer structure having thebase 220c (230c) of the outer layer sheet 220 (230), and a third part 200a3 (200c3) of a two-layer structure having the base 220c of theouter layer sheet 220 and the base 230c of theouter layer sheet 230. Thecentral portion 200b has a three-layer structure having the base 220c of theouter layer sheet 220, thebase 230c of theouter layer sheet 230 and theinner layer sheet 210.
The folding lines 201, 202 serve as guides for positioning thecentral portion 200b of thecleaning sheet 200 such that it faces the lower side (cleaning part) 111 of thehead 110 when thecleaning sheet 200 is attached to thehead 110 of thecleaning tool 100. A width R of thecentral portion 200b of the cleaning sheet 200 (distance between thefolding lines 201, 202) is preferably equal to or longer than a width W of the lower side (cleaning part) 111 of thehead 110 of the cleaning tool 100 (R ≧ W). Further, the width N of theinner layer sheet 210 is preferably equal to or shorter than the width W of the lower side (cleaning part) 111 of thehead 110 of the cleaning tool 100 (N ≧ W). The relationship between the distance R, the width N and the width W is not limited to this. - In this embodiment, a direction (the horizontal direction as viewed in
FIG. 3 ) along thefolding lines folding lines cleaning sheet 200 having nofolding lines end portions FIG. 3 ) is referred to as the "length direction", and a direction (the vertical direction as viewed inFIG. 3 ) transverse (perpendicular) to the extending direction of theend portions - In order to fix the
inner layer sheet 210 to theouter layer sheets inner layer sheet 210 and theouter layer sheets FIGS. 3 and 4 , theinner layer sheet 210 and theouter layer sheets FIGS. 5 and 6. FIG. 6 is a sectional view taken along line VI-VI inFIG. 5 .
When theinner layer sheet 210 is bonded to theouter layer sheets inner layer sheet 210 is released from theinner layer sheet 210 to theouter layer sheets inner layer sheet 210 and theouter layer sheets inner layer sheet 210 and theouter layer sheets central portion 200b in which theinner layer sheet 210 is disposed is located to face the lower side (cleaning part) 111 of thehead 110 of thecleaning tool 100, and therefore, cleaning is performed with thecentral portion 200b. Thus, thecentral portion 200b of thecleaning sheet 200 forms a "main cleaning area".
Therefore, in this embodiment, as shown inFIG. 5 , theinner layer sheet 210 is bonded to theouter layer sheets outer layer sheets FIG. 5 ). Specifically, the bonding area of bonding theinner layer sheet 210 and theouter layer sheets - Various methods can be used for such bonding. In this embodiment, a hot embossing method is used for the bonding. In
FIG. 5 , hotembossed portions 203 are formed on the edges of theouter layer sheets FIG. 7 , the hotembossed portions 203 and bondedportions 203a in which theinner layer sheet 210 is bonded to the outer layer sheets 220,230 are formed by hot embossing theouter layer sheets outer layer sheets inner layer sheet 210 is bonded to theouter layer sheets outer layer sheets 220, 230 (particularly, the thermoplastic fibers which have a lower melting point and are contained in theinner layer 222 of theouter layer sheet 220 and theinner layer 232 of the outer layer sheet 230) by hot embossing theouter layer sheets
In this specification, hot embossing for bonding theinner layer sheet 210 and theouter layer sheets - In this embodiment, it is necessary to prevent the cleaning solution impregnated in the
inner layer sheet 210 from leaking out from its ends in the width direction.
In this embodiment, as shown inFIG. 6 , in the third parts 200a3, 200c3 located on the both sides of theinner layer sheet 210 in the width direction, theouter layer sheets outer layer sheets FIG. 8 , hotembossed portions 204 and bondedportions 204a in which theinner layer sheet 210 is bonded to theouter layer sheets outer layer sheets
In this embodiment, thermoplastic fibers having a lower melting point are disposed in theouter layer sheets inner layer sheet 210 is not disposed in the third parts 200a3, 200c3. Therefore, in the third parts 200a3, 200c3, theouter layer sheets
The strength of the third parts 200a3, 200c3 is increased by bonding theouter layer sheets
In this embodiment, hot embossing for bonding theouter layer sheets
In this embodiment, only the edges of theinner layer sheet 210 on the both ends in the length direction are subjected to first hot embossing, but the edges of the third parts 200a3, 200c3 on the both ends in the length direction may also be subjected to first hot embossing. - In this embodiment, in order that the first part 200a1 (200c1) has a lower elongation rate than the second part 200a2 (200c2), the folded
part 220a and part of the base 220c of the outer layer sheet 220 (the foldedpart 230a and part of the base 230c of the outer layer sheet 230) are bonded together in the first part 200a1 (200c1). Various bonding methods can be used for bonding the foldedpart 220a and part of the base 220c of the outer layer sheet 220 (the foldedpart 230a and part of the base 230c of the outer layer sheet 230). In this embodiment, they are bonded together by hot embossing using a roller having depressions and projections.
In this embodiment, thermoplastic fibers having a lower melting point are contained in the outer layer sheet 220 (230). Further, theinner layer sheet 210 is not disposed between the foldedpart 220a and the base 220c of the outer layer sheet 220 (the foldedpart 230a and the base 230c of the outer layer sheet 230). Therefore, in the first part 200a1 (200c1), the foldedpart 220a and part of the base 220c of the outer layer sheet 220 (the foldedpart 230a and part of the base 230c of the outer layer sheet 230) can be easily bonded together by hot embossing.
By this hot embossing, the first part 200a1 formed by the foldedpart 220a and part of the base 220c of theouter layer sheet 220 and the first part 200c1 formed by the foldedpart 230a and part of the base 230c of theouter layer sheet 230 have a lower elongation rate than the second parts 200a2, 200c2. Specifically, the first parts 200a1, 200c1 are not as stretchy as the second parts 200a2, 200c2.
The elongation rate (mm/N) of the sheet is a measure of stretchiness. The higher the elongation rate, the stretchier the sheet.
In this specification, hot embossing for bonding theouter layer sheets - Further, the
inner layer sheet 210 is impregnated with cleaning solution. An appropriate cleaning solution by which dirt or contamination of the object to be cleaned can be removed can be used as the cleaning solution. For example, water-based cleaning solution containing alcohol, a surfactant, a solvent, an antiseptic, etc. can be used. Further, a floor protective agent, an abrasive, a freshener, perfume, etc. may be added to the cleaning solution. The amount of cleaning solution to be impregnated into theinner layer sheet 210 can be appropriately determined. For example, with respect to the weight of the yet-to-be impregnated cleaning sheet 200 (theinner layer sheet 210 and theouter layer sheets 220, 230), two to five times its volume of the cleaning solution is impregnated into theinner layer sheet 210. Various methods can be used for impregnating the cleaning solution into theinner layer sheet 210. For example, thecleaning sheet 200 may be formed by using theinner layer sheet 210 which is impregnated with the cleaning solution in advance. Alternatively, after thecleaning sheet 200 is formed, the cleaning solution may be applied to thecentral portion 200b of theouter layer sheets inner layer sheet 210 is impregnated with the cleaning solution via theouter layer sheets -
FIG. 10 shows thecleaning sheet 200 in this embodiment which is attached to thehead 110.FIG. 10 is a sectional view taken along line X-X (in the width direction) inFIG. 2 .
As shown inFIG. 10 , thecentral portion 200b of thecleaning sheet 200 is located to face the lower side (cleaning part) 111 of thehead 110. Theend portions cleaning sheet 200 are folded over along thefolding lines upper side 112 of thehead 110. In this embodiment, the length of the first parts 200a1, 200c1 (the length of the foldedparts central portion 200b of thecleaning sheet 200 is placed to face the lower side (cleaning part) 111 of thehead 110, and theend portions upper side 112 of thehead 110, part of aboundary 200P 1 between the first part 200a1 and the second part 200a2 and part of a boundary 200Q1 between the first part 200c1 and the second part 200c2 are placed to face the holding members 120 (the holding pieces 121). In this state, when the portions of the sheet facing the holdingpieces 121 are pushed in through the holdingpieces 121 by the fingers and then released, part of the boundary 200P1 between the first part 200a1 and the second part 200a2 and part of the boundary 200Q1 between the first part 200c1 and the second part 200c2 are caught and held between the holdingpieces 121. Further, the parts of the boundary 200P1 and the boundary 200Q1 caught between the holdingpieces 121 are pushed in through the holding pieces facing each other by the user's fmgers (seeFIG. 11 ). At this time, as shown inFIG. 10 , the first parts 200a1, 200c1 are located inward of the second parts 200a2, 200c2 or toward the center in the width direction (on the opposite side from thecentral portion 200b) and held by the holdingpieces 121.
In this embodiment, part of the boundary 200P1 (200Q1) between the first part 200a1 (200c1) having a lower elongation rate and the second part 200a2 (200c2) having a higher elongation rate is caught by the holdingpieces 121 facing each other. Specifically, a point of change in the elongation rate of the sheet is held by the holdingpieces 121. Therefore, even if a tensile force acts upon thecleaning sheet 200 in a direction opposite to the direction of movement of the head 110 (for example, the horizontal direction as viewed inFIG. 10 ) by a frictional force of an area to be cleaned during cleaning operation, the second part 200a2 or 200c2 having a higher elongation rate can effectively absorb the tensile stress, so that theend portions cleaning sheet 200 can be prevented from becoming detached from the holdingpieces 121.
Further, in order to detach thecleaning sheet 200 from thehead 110, the first part 200a1 (200c1) having a lower elongation rate is pulled so that the boundary 20OP1 (200Q1) can be easily pulled out through the holdingpieces 121. Thus, thecleaning sheet 200 can be easily detached from thehead 110.
In this embodiment, the second part 200a2 (200c2) having a higher elongation rate is designed as a single-layer structure and the first part 200a1 (200c1) having a lower elongation rate as a two-layer structure. With such a construction, the cleaning tool having the first part 200a1 (200c1) and the second part 200a2 (200c2) which are different in elongation rate can be easily manufactured at lower costs.
In this embodiment, with the construction in which the first part 200a1 (200c1) has a two-layer structure and the second part 200a2 (200c2) has a single-layer structure, the boundary 200P1 (200Q1) between the first part 200a1 (200c1) and the second part 200a2 (200c2) can be readily recognized by outward appearance, so that ease of mounting the cleaning sheet can be enhanced. - Operation of this invention is conceptually explained with reference to
FIG. 11 . InFIG. 11 , for the sake of simplicity of explanation, it is assumed that theend portion 200a (200c) of thecleaning sheet 200 has a first member X having a first elongation rate and a second member Y having a second elongation rate higher than the first elongation rate and disposed on thecentral portion 200b side of the first member X. The first member X and the second member Y substantially correspond to the above-described first part 200a1 (200c1) and the above-described second part 200a2 (200c2), respectively. Further, it is assumed that part of a boundary Z between the first member X and the second member Y is held by the holding members 120 (the holding pieces 121) of thehead 110 and thehead 110 is moved in a direction shown by the hollow arrow G (rightward) inFIG. 11 . The boundary Z substantially corresponds to the above-described boundary 200P1 (200Q1).
When thehead 110 is moved in the direction of the hollow arrow G, as shown inFIG.11 (1), by frictional force of an area to be cleaned, a tensile stress acts in the direction of the solid arrow F upon the second member Y disposed on the end in the direction of the hollow arrow G.
In the prior art, the cleaning sheet has a loosely entangled portion in its central portion and tightly entangled portions on the both ends, but each of the end portions of the sheet has a substantially uniform elongation rate across its entire region. Therefore, the loosely entangled portion is ineffective in absorbing a tensile stress F. Thus, the sheet element held by the holding members 120 (the holding pieces 121) uniformly stretches, so that theend portion 200a (200c) of thecleaning sheet 200 easily becomes detached from the holding members 120 (the holding pieces 121).
In this embodiment, as shown inFIG. 11(2) , part of the boundary Z between the first member X having a lower elongation rate and the second member Y having a higher elongation rate is held by the holdingpieces 121, so that the second member Y having the higher elongation rate becomes stretchy and can effectively absorb the tensile stress. In this case, part of the boundary Z between the first member X and the second member Y is kept held by the holdingpieces 121.
When the tensile stress acting upon the end portion of thecleaning sheet 200 increases, as shown inFIG. 11 (3), the boundary Z between the first member X and the second member Y is pulled out through the holdingpieces 121. In this case, theend portion 200a (200c) of thecleaning sheet 200 is detached from the holdingpieces 121.
Further, by pulling the first member X having a lower elongation rate, theend portion 200a (200c) of thecleaning sheet 200 can be easily detached from the holdingpieces 121. - Energy required for removing the cleaning sheet held by the holding pieces is measured in
embodiments 1 to 4 and comparative examples 1 to 7 of the cleaning sheets of this invention.FIGS. 12 to 18 show the constructions of the cleaning sheets ofembodiments 1 to 4 and comparative examples 1 to 7.
Further, inembodiments 1 to 4 and comparative examples 1 to 7, the width M is 205 mm. If the boundary Z between the first member X and the second member Y is located within the range of 20 to 40 mm from the ends (edges) in the width direction, the boundary Z between the first member X and the second member Y is placed to face the holding pieces of the head when the cleaning sheet is attached to the head.
In the following description, the "MD direction" represents the direction of the machine during manufacturing, and the "CD direction" represents a direction perpendicular to the MD direction.
Further, the "elongation rate (mm/N)" is represented as the inverse of an initial slope of a curve of [tensile stress (N)/amount of elongation (mm)] when the sheet having the width of 25 mm is pulled in a direction perpendicular to the direction of the width. -
Embodiment 1 has the construction shown inFIG. 12 . Each ofouter layer sheets 220, 23 0 has a width of 190 mm and has one end in the width direction which is folded so that a foldedpart parts outer layer sheets inner layer sheet 210. In each embodiment, hot embossing is given to where it is needed, which is not particularly specified.
Inembodiment 1, a first part 200a1 (200c1) or the first member X having a lower elongation rate has a two-layer structure having theouter layer sheets outer layer sheets FIG. 12 ).
Inembodiment 1, the first member X has the elongation rate of 1.00 mm/N, and the second member Y has the elongation rate of 3.30 mm/N. -
Embodiment 2 has the construction shown inFIG. 13 . Each ofouter layer sheets outer layer sheets inner layer sheet 310, andouter layer sheets
Inembodiment 2, a first part 300a1 (300c1) or the first member X having a lower elongation rate has a two-layer structure having the outer layer sheets 320 (330), 340 (350). A second part 300a2 (300c2) or the second member Y having a higher elongation rate has a single-layer structure having the outer layer sheet 320 (330). Further, the CD direction of theouter layer sheets FIG. 13 ), and the MD direction of theouter layer sheets
Inembodiment 2, the first member X has the elongation rate of 0.08 mm/N, and the second member Y has the elongation rate of 3.30 mm/N. -
Embodiment 3 has the construction shown inFIG. 13 . Each of theouter layer sheets outer layer sheets inner layer sheet 310, and 70g/m2 spun bond nonwoven fabrics (SB) 340, 350 having a width K of 20 mm are arranged on the both ends (edges) of the sheet in the width direction.
Inembodiment 3, the first part 300a1 (300c1) or the first member X having a lower elongation rate has a two-layer structure having the outer layer sheet 320 (330) and the 70g/m2 spun bond nonwoven fabric 340 (350). A second part 300a2 (300c2) or the second member Y having a higher elongation rate has a single-layer structure having the outer layer sheet 320 (330). Further, the CD direction of theouter layer sheets FIG. 13 ).
Inembodiment 3, the first member X has the elongation rate of 0.06 mm/N, and the second member Y has the elongation rate of 3.3 0 mm/N. - Embodiment 4 has the construction shown in
FIG. 14 . Each ofouter layer sheets 420, 43 0, 440, 45 0 has a width T of 170 mm. Theouter layer sheets inner layer sheet 410, and 70g/m2 spun bondnonwoven fabrics
In embodiment 4, a first part 400al (400cm) or the first member X having a lower elongation rate has a three-layer structure having theouter layer sheet 420, 430 (440, 450) and the 70g/m2 spun bond nonwoven fabric 460 (470). A second part 400a2 (400c2) or the second member Y having a higher elongation rate has a two-layer structure having theouter layer sheets 420, 430 (440, 450). Further, the CD direction of theouter layer sheets FIG. 14 ).
In embodiment 4, the first member X has the elongation rate of 0.06 mm/N, and the second member Y has the elongation rate of 1.00 mm/N. - Comparative example 1 has the construction shown in
FIG. 15 . Each ofouter layer sheets outer layer sheets inner layer sheet 510.
In comparative example 1, a first part 500a1 (500c1) having a width of 55 mm from the end of the sheet in the width direction has a single-layer structure having the outer layer sheet 520 (530). Further, the CD direction of theouter layer sheets FIG. 15 ).
In comparative example 1, the first member X has the elongation rate of 3.30 mm/N, and the second member Y has the elongation rate of 3.30 mm/N. - Comparative example 2 has the construction shown in
FIG. 16 . Each ofouter layer sheets outer layer sheets inner layer sheet 610.
In comparative example 2, afirst part 600a (600c) having a width of 55 mm from the end of the sheet in the width direction has a two-layer structure having theouter layer sheets outer layer sheets FIG. 16 ).
In comparative example 2, the first member X has the elongation rate of 1.00 mm/N, and the second member Y has the elongation rate of 1.00 mm/N. - Comparative example 3 has the construction shown in
FIG. 16 . Each ofouter layer sheets outer layer sheets inner layer sheet 610.
In comparative example 3, afirst part 600a (600c) having a width of 55 mm from the end of the sheet in the width direction has a two-layer structure having theouter layer sheets outer layer sheet 620 and the MD direction of theouter layer sheet 630 coincide with the width direction of the sheet (the horizontal direction inFIG. 16 ).
In comparative example 3, the first member X has the elongation rate of 0.08 mm/N, and the second member Y has the elongation rate of 0.08 mm/N. - Comparative example 4 has the construction shown in
FIG. 17 . Each ofouter layer sheets outer layer sheets inner layer sheet 710. Further,outer layer sheets
In comparative example 4, a first part 700a1 (700c1) having a width of 20 mm from the end of the sheet in the width direction has a single-layer structure having the outer layer sheet 720 (730). A second part 700a2 (700c2) extending in the range of 20 to 40 mm from the end of the sheet in the width direction has a two-layer structure having theouter layer sheets 720, 740 (730, 750). Further, the CD direction of theouter layer sheets FIG. 17 ).
In comparative example 4, the first member X has the elongation rate of 3.30 mm/N, and the second member Y has the elongation rate of 1.00 mm/N. - Comparative example 5 has the construction shown in
FIG. 17 . Each ofouter layer sheets outer layer sheets inner layer sheet 710. Further,outer layer sheets
In comparative example 5, a first part 700a1 (700c1) having a width of 20 mm from the end of the sheet in the width direction has a single-layer structure having the outer layer sheet 720 (730). A second part 700a2 (700c2) extending in the range of 20 to 40 mm from the end of the sheet in the width direction has a two-layer structure having theouter layer sheets 720, 740 (730, 750). Further, the CD direction of theouter layer sheets outer layer sheets FIG. 17 ).
In comparative example 5, the first member X has the elongation rate of 3.3 0 mm/N, and the second member Y has the elongation rate of 0.08 mm/N. - Comparative example 6 has the construction shown in
FIG. 17 . Each ofouter layer sheets outer layer sheets inner layer sheet 710. Further, 70g/m2 spun bondnonwoven fabrics
In comparative example 6, a first part 700a1 (700c1) having a width of 20 mm from the end of the sheet in the width direction has a single-layer structure having the outer layer sheet 720 (730). A second part 700a2 (700c2) extending in the range of 20 to 40 mm from the end of the sheet in the width direction has a two-layer structure having the outer layer sheet 720 (730) and the 70g/m2 spun bond nonwoven fabric 740 (750). Further, the CD direction of theouter layer sheets FIG. 17 ).
In comparative example 6, the first member X has the elongation rate of 3.30 mm/N, and the second member Y has the elongation rate of 0.06 mm/N. - Comparative example 7 has the construction shown in
FIG. 18 . Each ofouter layer sheets outer layer sheets inner layer sheet 810. Further, 70g/m2 spun bondnonwoven fabrics
In comparative example 7, a first part 800a1 (800c1) having a width of 20 mm from the end of the sheet in the width direction has a two-layer structure having theouter layer sheets 820, 830 (840, 850). A second part 800a2 (800c2) extending in the range of 20 to 40 mm from the end of the sheet in the width direction has a three-layer structure having theouter layer sheets 820, 830 (840, 850) and the 70g/m2 spun bond nonwoven fabric 860 (870). Further, the CD direction of theouter layer sheets FIG. 18 ).
In comparative example 7, the first member X has the elongation rate of 1.00 mm/N, and the second member Y has the elongation rate of 0.06 mm/N. - Energy (J) required to remove the sheets of
embodiments 1 to 4 and comparative examples 1 to 7 from the holdingpieces 121 of thehead 110 was measured. The measurements of energy were made as follows: - (1) Part of a specimen is pushed in through the holding
pieces 121 of the fixed head. At this time, the amount of the specimen to be pushed in is adjusted to be constant by using an artificial finger. - (2) Then a predetermined point of the specimen held by the holding
pieces 121 of the head is pulled. Upon removal of the specimen from the holdingpieces 121, the tensile stress is measured. - (3) This measurement is made on several pieces of the same specimen.
- As described above, in the outer layer sheet arranged on the both sides of the inner layer sheet (impregnated element) in the cleaning sheet of this embodiment, a fusion bonded layer is formed on the side (inner side) of the outer layer sheet which faces the inner layer sheet. With this construction, the amount of the cleaning solution which is released from the impregnated element to the outer layer sheet is controlled. Therefore, during cleaning operation (when a load is put on the surface of the cleaning sheet), an appropriate amount of the cleaning solution can be released from the surface of the cleaning sheet.
Further, the inner layer sheet and the outer layer sheets are bonded at the edges of the inner layer sheet, and a space is formed between the inner layer sheet and the outer layer sheets. With this construction, the amount of the cleaning solution which is released from the inner layer sheet to the outer layer sheets via the bonded portions can be controlled.
Further, each of the ends of the cleaning sheet has a first part having a lower elongation rate and a second part having a higher elongation rate and the second part is disposed on the central portion side of the first part. The boundary between the first part and the second part is held by the holding pieces. With this construction, the ends of the cleaning sheet can be effectively prevented from becoming detached from the holding members 120 (the holding pieces 121) during cleaning operation. - In order to form a region having a higher elongation rate, in this embodiment, the layered sheet elements are bonded together by hot embossing, but a method of changing the elongation rate is not limited to this. For example, the layered sheet elements can be bonded together by using methods other than hot embossing. Further, when manufacturing a nonwoven fabric sheet (spun lace nonwoven fabric sheet) by a water jet method (hydroentangling method), the elongation rate of the particular region of the sheet may be increased by closing the nozzle in such a manner as to render the region out of reach of the water jet, or the elongation rate may be changed by changing the constitution of raw cotton.
The constructions that have been described in the above embodiment can be used singly or in combination of appropriately selected ones of them.
Further, in this embodiment, the cleaning sheet is described as a wet sheet in which the cleaning solution is impregnated in the inner layer sheet so as to be used for cleaning in a wetted state, but it may be designed as a dry sheet in which the cleaning solution is not impregnated in the inner layer sheet so as to be used for cleaning in a dry state.
The constructions of the cleaning sheet is not limited to those described in the above-described embodiment, but rather, may be added to, changed, replaced with alternatives or otherwise modified.
Further, the following features can be included in claims of the invention: - "The outer layer sheet is formed of fibers containing thermoplastic fibers, and thermoplastic fibers provided on a side of the outer layer sheet facing the inner layer sheet have a lower melting point than thermoplastic fibers provided on the side of the outer layer sheet opposite to the side facing the inner layer sheet."
- "The inner layer sheet and the outer layer sheets are bonded at the edges of the outer layer sheet, and a space is formed in a central portion of the inner sheet between the inner layer sheet and the outer layer sheets."
- "The inner layer sheet is centrally located in the cleaning sheet which is placed on the cleaning part (mounting side) of the cleaning sheet mounting member."
- As the cleaning sheet to be used in a wetted state to clean an object, for example, a cleaning sheet having an impregnated element (e.g. inner layer sheet) impregnated with the cleaning solution, and outer layer sheets disposed on both sides of the impregnated element is used. In this case, a cleaning region (cleaning part) of the cleaning sheet which can be used to clean an object to be cleaned in an appropriate wetted state is determined by the property of releasing the cleaning solution from the outer surfaces of the outer layer sheets. Further, the property of releasing the cleaning solution from the outer surfaces of the outer layer sheets is determined by the property of releasing the cleaning solution from the impregnated element to the outer layer sheets. Further, the property of releasing the cleaning solution from the impregnated element to the outer layer sheets is determined by the amount of cleaning solution which can be impregnated into the impregnated element, or the amount of cleaning solution which is released from the impregnated element to the outer layer sheets. In order to control the amount of cleaning solution which is released from the impregnated element to the outer layer sheets, a space (clearance) may be provided between the impregnated element and the outer layer sheets, or a fusion bonded layer may be formed on the inner sides of the outer layer sheets (facing the impregnated element). In the above-described embodiment, a method for controlling the property of releasing cleaning solution from the impregnated element to the outer layer sheets is used.
The above-described cleaning sheet may also be used singly (without being mounted to the cleaning sheet mounting member of the cleaning tool) to clean an object to be cleaned. Further, the cleaning sheet or the cleaning tool of this invention can be used to clean objects having various shapes, such as planar, curved, uneven or stepped shape.
Further, the cleaning sheet may also be designed to be used in a dry state to clean an object to be cleaned. -
- 100
- cleaning tool
- 110
- head (cleaning sheet mounting member)
- 120
- holding member
- 121
- holding piece
- 130
- pipe
- 131
- connecting mechanism
- 150
- handle
- 200, 300, 400, 500, 600, 700, 800
- cleaning sheet
- 200a, 200c, 300a, 300c, 400a, 400c,
- 00a, 00c, 600a, 600c, 700a, 700c, 800a, 800c
- end portion
- 200al,200cl
- first part
- 200a2, 200c2
- second part
- 200a3, 200c3
- third part
- 200P1, 200Q1
- first boundary
- 200P2, 200Q2
- second boundary
- 200b, 300b, 400b, 500b, 600b, 700b, 800b
- central portion (cleaning part)
- 201,202,220b,230b
- folding line
- 220a, 230a
- folded part
- 210, 310, 410, 510, 610, 710, 810
- inner layer sheet
- 220, 230, 320, 330, 420, 430, 520,
- 530, 620, 630, 720, 730, 820, 830
- outer layer sheet
- 221, 231
- outer layer
- 222, 232
- inner layer (fusion bonded layer)
- 203, 204
- hot embossed portion
From the measurements, it has been found that, by making the elongation rate of the first member X lower than the elongation rate of the second member Y, the
Claims (8)
- A cleaning sheet attachable to a cleaning sheet mounting member comprising:a central portion forming a cleaning side andat least one end portion formed on at least one side of the central portion along one predetermined direction, wherein:the end portion has a first part having a first elongation rate and a second part having an elongation rate higher than the first elongation rate and formed between the first part and the central portion along the one direction, anda boundary between the first and second parts is removably heldabe by the cleaning sheet mounting member.
- The cleaning sheet as defined in claim 1, wherein the second part is formed by a single sheet element or by a plurality of sheet elements layered and bonded together, and the first part is formed by a larger number of thicknesses of sheet elements bonded together than the sheet elements of the second part, so that the second part has a higher elongation rate than the first part.
- The cleaning sheet as defined in claim 1, wherein the second part has a higher elongation rate than the first part by changing an entangled state of fibers in each of the first and second parts.
- The cleaning sheet as defined in claim 1, wherein the second part has a higher elongation rate than the first part changing the constitution of raw cotton in each of the first and second parts.
- The cleaning sheet as defined in one of claims 2 to 4, wherein the layered sheet elements of the first part are bonded together by embossing.
- The cleaning sheet as defined in any one of claims 1 to 5, wherein the at least one end portion has a third part having a lower elongation rate than the second part and formed between the second part and the central portion along the one direction.
- A cleaning tool having the cleaning sheet as defined in any one of claims 1 to 6 and a caning sheet mounting member, wherein:the cleaning sheet mounting member has a cleaning part and a holding member, andwhen the cleaning sheet is attached to the cleaning sheet mounting member, a central portion of the cleaning sheet is placed on the cleaning part and the boundary is removably held by the holding member.
- The cleaning tool as defined in claim 7, wherein the holding member has a plurality of elastic holding pieces which are opposed to each other, and the boundary of the cleaning sheet is pushed in through the holding member between the holding pieces and caught by the holding pieces, so that the boundary is held by the holding member.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010215369A JP2011136149A (en) | 2009-12-01 | 2010-09-27 | Cleaning sheet and cleaning tool |
PCT/JP2011/071708 WO2012043409A1 (en) | 2010-09-27 | 2011-09-22 | Cleaning sheet and cleaning implement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2623011A1 true EP2623011A1 (en) | 2013-08-07 |
EP2623011A4 EP2623011A4 (en) | 2017-09-06 |
Family
ID=45895517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11828965.1A Withdrawn EP2623011A4 (en) | 2010-09-27 | 2011-09-22 | Cleaning sheet and cleaning implement |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2623011A4 (en) |
JP (1) | JP5918696B2 (en) |
CN (1) | CN103140156B (en) |
WO (1) | WO2012043409A1 (en) |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3208306B2 (en) * | 1995-11-17 | 2001-09-10 | ユニ・チャーム株式会社 | Disposable wiping tools |
JP3706433B2 (en) * | 1996-06-28 | 2005-10-12 | ユニ・チャーム株式会社 | Sheet cleaning material |
JP3680456B2 (en) * | 1996-11-14 | 2005-08-10 | 日本製紙株式会社 | Composite sheet for wipes |
US6305046B1 (en) * | 1998-06-02 | 2001-10-23 | The Procter & Gamble Company | Cleaning implements having structures for retaining a sheet |
JP3558892B2 (en) * | 1998-09-24 | 2004-08-25 | ユニ・チャーム株式会社 | Cleaning sheet |
JP3754570B2 (en) * | 1999-03-11 | 2006-03-15 | ユニ・チャーム株式会社 | Cleaning sheet |
JP4410458B2 (en) * | 2002-08-02 | 2010-02-03 | 山田 千代恵 | Cleaning tool sheet |
JP4571470B2 (en) * | 2004-09-30 | 2010-10-27 | ユニ・チャーム株式会社 | Cleaning sheet |
JP4671792B2 (en) * | 2005-07-12 | 2011-04-20 | 花王株式会社 | Cleaning sheet |
CN101209196B (en) * | 2006-12-28 | 2012-03-21 | 杨雅箐 | Mop cleaning cloth fixing structure |
JP4628352B2 (en) * | 2006-12-29 | 2011-02-09 | 花王株式会社 | Cleaning sheet |
CN102639045B (en) * | 2009-12-01 | 2015-04-29 | 尤妮佳股份有限公司 | Cleaning sheet and cleaning tool |
-
2011
- 2011-09-22 EP EP11828965.1A patent/EP2623011A4/en not_active Withdrawn
- 2011-09-22 WO PCT/JP2011/071708 patent/WO2012043409A1/en active Application Filing
- 2011-09-22 CN CN201180046715.5A patent/CN103140156B/en active Active
- 2011-09-22 JP JP2012536412A patent/JP5918696B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2012043409A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2623011A4 (en) | 2017-09-06 |
CN103140156B (en) | 2016-08-31 |
WO2012043409A1 (en) | 2012-04-05 |
JP5918696B2 (en) | 2016-05-18 |
JPWO2012043409A1 (en) | 2014-02-06 |
CN103140156A (en) | 2013-06-05 |
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