Interdental cleaning tool
Provided is an interdental cleaning tool which has a simple configuration and can effectively prevent an occurrence of breakage of a core base portion when inserting the interdental cleaning tool into an interdental space or during interdental cleaning without reducing productivity of the interdental cleaning tool. An interdental cleaning tool ( 1 ) includes: a base portion ( 10 ) made of a synthetic resin; and a soft portion ( 20 ) made of an elastomer, the base portion ( 10 ) having a handle base portion ( 11 ) and a core base portion ( 12 ), the soft portion ( 20 ) having at least a cleaning soft portion ( 21 ) that covers the core base portion ( 12 ), in which two or more cleaning portion recesses ( 14 ) which penetrate the cleaning soft portion ( 21 ) and form core base portion recesses in the core base portion ( 12 ) are formed on each of a first side portion and second side portion of a cleaning portion ( 2 ) at an interval in an axial direction of the cleaning portion ( 2 ), and at least one set of two cleaning portion recesses ( 14 ) out of plural sets of cleaning portion recesses ( 14 ) paired with each other between the first side portion and the second side portion are formed at an interval in the axial direction of the cleaning portion ( 2 ) so as not to overlap each other in a circumferential direction of the cleaning portion ( 2 ).
1. An interdental cleaning tool comprising:
a base portion made of a synthetic resin; and
a soft portion made of an elastomer that covers at least a part of the base portion,
the base portion including a handle base portion, and a core base portion that has an elongated shaft-shape and connects continuously to a tip end portion of the handle base portion,
the soft portion having at least a cleaning soft portion that covers the core base portion,
the handle base portion constituting a handle portion serving as a grip, and
the core base portion and the cleaning soft portion which constitute a cleaning portion for interdental cleaning,
wherein two or more cleaning portion recesses which penetrate the cleaning soft portion and form core base portion recesses in the core base portion are formed on each of a first side portion and a second side portion of the cleaning portion at an interval in an axial direction of the cleaning portion,
at least one set of the two cleaning portion recesses out of plural sets of the cleaning portion recesses pairing with each other between the first side portion and the second side portion are formed at an interval in the axial direction of the cleaning portion so as to be avoided from overlapping each other in a circumferential direction of the cleaning portion, and
the at least one set of the cleaning portion recesses formed at the interval in the axial direction of the cleaning portion has, therebetween, an interval in the axial direction of the cleaning portion, the interval being set to one fourth or more and three times or less of a maximum axial length of the cleaning portion recesses.
2. The interdental cleaning tool according to claim 1 , wherein the at least one set of the cleaning portion recesses formed at the interval in the axial direction of the cleaning portion has, therebetween, an interval in the axial direction of the cleaning portion, the interval being set to one fourth or more of a maximum axial length of the cleaning portion recesses.
3. The interdental cleaning tool according to claim 1 , wherein the cleaning portion recesses are arranged at a substantially uniform interval, or at an interval narrowed as approaching to a tip end side of the cleaning portion, in the axial direction of the cleaning portion.
4. The interdental cleaning tool according to claim 1 , wherein the two or more core base portion recesses have opening areas that are set to be substantially identical in size to one another, or are set so that an opening area of the core base portion recess on a most tip end side among the plurality of core base portion recesses is smallest.
5. The interdental cleaning tool according to claim 1 , wherein the core base portion recess in at least one of the two or more of cleaning portion recesses has an opening that has a shape elongated in the axial direction of the cleaning portion.
6. The interdental cleaning tool according to claim 5 , wherein the core base portion recess elongated in the axial direction has a maximum axial length of 0.4 mm or more and 1.5 mm or less.
7. The interdental cleaning tool according to claim 5 , wherein the core base portion recess elongated in the axial direction has an opening area of 0.15 mm 2 or more and 0.6 mm 2 or less.
8. The interdental cleaning tool according to claim 1 , wherein the core base portion recesses have a maximum depth set to 0.01 mm or more and 0.085 mm or less.