Cleaning sheet and cleaning instrument

Abstract

A cleaning sheet and cleaning instrument that are structured to have a space for capturing dust in a cleaning region. Fiber bundle constituent fibers forming a fiber bundle and strips are configured to be bent along a bonding part so as to be raised up in a direction away from a holding region. The fiber bundle is configured such that, when a first strip and a second strip are raised, a first engagement part can be engaged with the fiber bundle constituent fibers, and a second engagement part of the first strip and a second engagement part of the second strip can be engaged with each other.

1 . A cleaning sheet configured to be attached to a holder, comprising:
 a holding region which is attached to the holder, and   a cleaning region which comes in contact with an object to be cleaned, wherein:   the holding region has sheet elements and a receiving part configured to receive the holder and formed by superposing the sheet elements,   the cleaning region has a fiber bundle, a cleaning side sheet-like member superposed on the fiber bundle, and a bonding part that bonds the fiber bundle and the cleaning side sheet-like member,   the fiber bundle is formed by arranging a plurality of fiber bundle constituent fibers having prescribed orientation,   the cleaning side sheet-like member has a first surface facing the fiber bundle, a second surface on the side opposite to the first surface, a cut element and a strip element defined by the cut element,   the cut element comprises a plurality of cuts,   the strip element is formed between adjacent ones of the cuts and has a first strip and a second strip,   the fiber bundle constituent fibers are configured to be bent along the bonding part so as to be raised up in a direction away from the holding region,   each of the first strip and the second strip has a first engagement part formed on the first surface and a second engagement part formed on the second surface and is configured to be bent along the bonding part so as to be raised up in a direction away from the holding region, and   when the first strip and the second strip are raised, the first engagement part can be engaged with the fiber bundle constituent fibers, and the second engagement part of the first strip and the second engagement part of the second strip can be engaged with each other.   
     
     
         2 . The cleaning sheet as defined in  claim 1 , wherein the cleaning side sheet-like member has a first direction that is defined by a direction from the bonding part toward a free end of the strip element, and a second direction crossing the first direction. 
     
     
         3 . The cleaning sheet as defined in  claim 1 , wherein the cleaning side sheet-like member is formed of nonwoven fabric and the nonwoven fabric has a plurality of nonwoven fabric constituent fibers having orientation in the first direction. 
     
     
         4 . The cleaning sheet as defined in  claim 3 , wherein the first engagement part is formed of the nonwoven fabric constituent fibers exposed to the first surface. 
     
     
         5 . The cleaning sheet as defined in  claim 3 , wherein the second engagement part is formed of the nonwoven fabric constituent fibers exposed to the second surface. 
     
     
         6 . The cleaning sheet as defined in  claim 3 , wherein the nonwoven fabric has higher rigidity in the first direction than in the second direction. 
     
     
         7 . The cleaning sheet as defined in  claim 3 , wherein the nonwoven fabric has rigidity of 69.7 to 80.0 mm in the first direction and rigidity of 35.0 to 39.9 mm in the second direction. 
     
     
         8 . The cleaning sheet as defined in  claim 3 , wherein the nonwoven fabric has total light transmittance of 83% or more. 
     
     
         9 . The cleaning sheet as defined in  claim 3 , any one of  claims 3  to  8 , wherein the nonwoven fabric has total light transmittance of 83.03 to 88.43%. 
     
     
         10 . The cleaning sheet as defined in  claim 3 , wherein the nonwoven fabric has a larger average surface friction coefficient in the first direction on the second surface than on the first surface. 
     
     
         11 . The cleaning sheet as defined in  claim 3 , wherein the nonwoven fabric has an average surface friction coefficient of 0.126 to 0.129μ in the first direction on the first surface and an average surface friction coefficient of 0.138 to 0.145μ in the first direction on the second surface. 
     
     
         12 . The cleaning sheet as defined in  claim 3 , wherein the nonwoven fabric has a larger average surface friction coefficient in the second direction on the second surface than on the first surface. 
     
     
         13 . The cleaning sheet as defined in  claim 3 , wherein the nonwoven fabric has an average surface friction coefficient of 0.136 to 0.137μ in the second direction on the first surface and an average surface friction coefficient of 0.145 to 0.163μ in the second direction on the second surface. 
     
     
         14 . The cleaning sheet as defined in  claim 3 , wherein the nonwoven fabric has a larger average deviation of surface roughness in the first direction on the second surface than on the first surface. 
     
     
         15 . The cleaning sheet as defined in  claim 3 , wherein the nonwoven fabric has an average deviation of surface roughness of 3.225 to 3.350μ in the first direction on the first surface and an average deviation of surface roughness of 3.250 to 3.535μ in the first direction on the second surface. 
     
     
         16 . The cleaning sheet as defined in  claim 1 , wherein the sheet element comprises a laminate sheet formed by superposing a first sheet-like member and a second sheet-like member one on the other,
 the laminate sheet has a first sheet bonding part that bonds the first sheet-like member and the second sheet-like member, and a second sheet bonding part that is spaced apart from the first sheet bonding part and bonds the first sheet-like member and the second sheet-like member, and   the receiving part comprises a space surrounded by the first sheet-like member, the second sheet-like member, the first sheet bonding part and the second sheet bonding part.   
     
     
         17 . The cleaning sheet as defined in  claim 1 , wherein:
 the sheet element comprises a single sheet-like member,   the sheet-like member has a superposed part formed by superposing regions spaced apart from each other in the sheet-like member one on the other, and a sheet bonding part that bonds the superposed regions of the sheet-like member in the superposed part, and   the receiving part comprises a space surrounded by the sheet bonding part and a region of the sheet-like member which extends in a loop between the spaced-apart regions bonded at the sheet bonding part.   
     
     
         18 . A cleaning tool, having a holder and a cleaning sheet attached to the holder, wherein:
 the holder has a grip configured to be held by a user, and a long part connected to the grip,   the cleaning sheet has a holding region attached to the long part and a cleaning region which comes in contact with an object to be cleaned,   the holding region has sheet elements and a receiving part configured to receive the long part and formed by superposing the sheet elements,   the cleaning region has a fiber bundle, a cleaning side sheet-like member superposed on the fiber bundle, and a bonding part that bonds the fiber bundle and the cleaning side sheet-like member,   the fiber bundle is formed by arranging a plurality of fiber bundle constituent fibers having prescribed orientation,   the cleaning side sheet-like member has a first surface facing the fiber bundle, a second surface on the side opposite to the first surface, a cut element and a strip element defined by the cut element,   the cut element comprises a plurality of cuts,   the strip element is formed between adjacent ones of the cuts and has a first strip and a second strip,   the fiber bundle constituent fibers are configured to be bent along the bonding part so as to be raised up in a direction away from the holding region,   each of the first strip and the second strip has a first engagement part formed on the first surface and a second engagement part formed on the second surface and is configured to be bent along the bonding part so as to be raised up in a direction away from the holding region,   when the first strip and the second strip are raised, the first engagement part can be engaged with the fiber bundle constituent fibers, and the second engagement part of the first strip and the second engagement part of the second strip can be engaged with each other.