WO2023145750A1

WO2023145750A1 - Toothbrush and toothbrush handle

Info

Publication number: WO2023145750A1
Application number: PCT/JP2023/002172
Authority: WO
Inventors: 和也小川; 崇三浦
Original assignee: 大王製紙株式会社
Priority date: 2022-01-28
Filing date: 2023-01-25
Publication date: 2023-08-03
Also published as: JP2023110272A; JP2023110841A; JP7216849B1

Abstract

[Problem] To provide a toothbrush handle for which plastic is not used. [Solution] Provided is a toothbrush handle having: a head part that has a plurality of bristle holes into which bundles of bristles are implanted, a neck part extending from the head part, and a handle part extending from the neck part. The toothbrush handle is characterized in that: one or a plurality of bristle-hole perforated layers in which a plurality of through holes are formed in the head-part location and one or a plurality of bristle-hole nonperforated layers in which holes are not formed in the head-part location are stacked, giving the head part nonpenetrating bristle pores; and in that the bristle-hole nonperforated layers are multilayer-paper layers or multilayer-paper-derived layers.

Description

Toothbrush and toothbrush handle

The present invention relates to a toothbrush and a handle for a toothbrush.

A known toothbrush has a bundle of bristles that are bundled together at the tip of the handle. General household toothbrushes, portable toothbrushes, and general-purpose toothbrushes such as amenity products provided to guests by hotel and inn lodging businesses have a handle, a head portion in which tufts are implanted, and a neck portion. It has a handle portion extending to the head portion through a shaft, and generally has an elongated shape as a whole. In addition, the head portion is often formed thin in consideration of operability in the oral cavity, and the neck portion is shaped to have a smaller diameter than the head portion in consideration of operability in the oral cavity. There are many. In addition, the handle of a toothbrush is generally made of hard plastic such as polypropylene polyethylene, polyethylene terephthalate, or arylate from the standpoints of moldability, strength required for use and flocking by flat wire driving (

Patent Documents

1 and 2 below).

On the other hand, in recent years, problems such as marine pollution caused by microplastics have attracted attention, and from the perspective of environmental protection, the world is moving away from plastics. In Japan as well, the Law Concerning the Promotion of Resource Recycling Related to Plastics was enacted, and for example, certain business operators were obliged to reduce disposable plastic products. The Law Concerning Promotion of Resource Circulation Related to Plastics designates toothbrushes provided to guests by lodging businesses such as hotels and inns as “products using specific plastics.” Demand for plastic is increasing.

Technologies for using natural materials other than plastic, such as paper, wood, and bamboo, for toothbrush handles and the like instead of plastic are disclosed in Patent Documents 3, 4, and 5 below.

Japanese Patent Application Laid-Open No. 2021-16496 Japanese Patent Application Laid-Open No. 2013-458 JP 2005-110727 A Utility Model Registration No. 3175154 Japanese Patent Application Laid-Open No. 2003-325231

However, the techniques described in Patent Literature 3 and Patent Literature 4 are based on the assumption that they are disposable, and have a simple structure in which the brush portion is attached to the handle portion with an adhesive, and sufficient consideration has been given to strength. Instead, it had a very different feeling of use from general-purpose products made of hard plastic, and it was not something that could be used as a substitute for general-purpose products made of hard plastic.

In the technique described in Patent Document 5, the brush body is formed by pressurizing natural plant fibers and a paper material made of natural plant fibers with a mold, or by polymerizing a plurality of sheet-like paper materials. The strength of the main body of the brush has been increased, and it is made of hard plastic in the shape of a general-purpose product. However, it is difficult to achieve sufficient strength that can be used in the same manner as general-purpose products made of hard plastic. In addition, it is difficult to implant the hair by driving a flat wire, unlike the conventional hard plastic general-purpose product.

Therefore, the main object of the present invention is to have the same feeling of use as a conventional hard plastic general-purpose product, and to be able to be easily manufactured by flat wire driving in the same manner as a hard plastic general-purpose product. To provide a toothbrush handle which does not use plastic, and a toothbrush having the handle.

The first means to solve the above problem is
A handle for a toothbrush, comprising a head portion having a plurality of tufting holes into which tufts are implanted, a neck portion extending from the head portion, and a handle portion extending from the neck portion,
One or a plurality of bristle-implanted hole-formed layers having a plurality of through-holes formed at the head position and one or a plurality of bristle-implanted hole non-formed layers having no holes formed at the head position are laminated to form a head. A handle for a toothbrush, characterized in that it has non-penetrating tuft holes in a part thereof, and the bristle pore forming layer and the bristle non-forming layer are multilayer paper or a layer derived from the multilayer paper.

The second means is
The multi-layered paper or the layer derived from the multi-layered paper constituting the bristle-implanted hole forming layer and the bristle-implanted hole non-forming layer is such that the tips of cut and raised pieces formed on part of the front and back surfaces of the pattern are inserted into at least adjacent layers. The toothbrush handle according to the first means, wherein the layers are joined by at least one of a locking structure and an adhesive that engage the layers with each other.

A third way is
A toothbrush handle according to the first or second means, containing a siloxane compound.

A fourth means is
A toothbrush handle having a head portion having a plurality of flocking holes into which tufts are flocked, a neck portion extending from the head portion, and a handle portion extending from the neck portion,
A toothbrush in which bristle bundles are implanted in the bristle holes by flat line driving,
The handle for the toothbrush,
One or a plurality of bristle-implanted hole-formed layers having a plurality of through-holes formed at the head position and one or a plurality of bristle-implanted hole non-formed layers having no holes formed at the head position are laminated to form a head. has non-penetrating tufting holes in the part, and the flocking hole-forming layer and the non-flocking hole-forming layer are formed of multi-layered paper or a layer derived from multi-layered paper,
A toothbrush characterized by:

A fifth means is
The multi-layered paper or the layer derived from the multi-layered paper constituting the bristle-implanted hole forming layer and the bristle-implanted hole non-forming layer is such that the tips of cut and raised pieces formed on part of the front and back surfaces of the pattern are inserted into at least adjacent layers. The toothbrush according to the fourth means, wherein the layers are joined by at least one of a locking structure and an adhesive that mutually engage the layers.

A sixth means is
The toothbrush according to the fourth or fifth means, wherein the handle contains a siloxane compound.

The seventh measure is
The toothbrush according to the above fourth or fifth means, wherein the tufts of bristles are bundles of at least one selected from the group consisting of biomass filaments, natural bristles and paper threads.

According to the present invention, a plastic that has the same feeling of use as a conventional hard plastic general-purpose product and can be easily manufactured by flat wire driving in the same manner as a hard plastic general-purpose product. A free toothbrush handle and a toothbrush having the handle are provided.

It is a front view of the handle for toothbrushes which concerns on this embodiment. It is a schematic diagram of the cross section of the direction along the longitudinal direction of the handle for toothbrushes which concerns on this embodiment. It is a cross-sectional schematic diagram for demonstrating the structure of the handle for toothbrushes which concerns on this embodiment. It is a figure for demonstrating the locking structure which concerns on this embodiment. It is a cross-sectional schematic diagram of the multi-layered paper according to the present embodiment. It is an enlarged view of the head part of the handle for toothbrushes which concerns on this embodiment. It is a schematic diagram of the cross section of the toothbrush which concerns on this embodiment. It is a figure which shows the toothbrush which concerns on this embodiment. It is a first diagram for explaining an example of a method for manufacturing a toothbrush handle according to the present embodiment. It is the second figure for demonstrating the example of the manufacturing method of the handle for toothbrushes which concerns on this embodiment. It is a figure for demonstrating the bending-strength measuring method of the handle for toothbrushes which concerns on this embodiment. It is a figure for demonstrating the result of the bending-strength measurement of the handle for toothbrushes which concerns on this embodiment.

Next, embodiments of the present invention will be described in detail below with reference to FIGS. 1-12. However, the invention is not limited to these embodiments.

1 and 2, the toothbrush handle 10 of the present embodiment includes a head portion 11 having a plurality of tufting holes 11H into which the tufts 2 are implanted, and a head extending from the head portion 11. It is composed of a neck portion 12 narrower than the portion 11 and a handle portion 13 extending from the neck portion 12 and wider than the neck portion 12, and has a thin elongated shape as a whole.

The toothbrush 1 according to the present embodiment shown in FIGS. 7 and 8 is formed by flocking the tufts 2 into the tufting holes 11H of the handle 10 for the toothbrush. In addition, also about the toothbrush 1 which concerns on this embodiment, the same code|symbol is attached|subjected to the part corresponding to the handle 10 for toothbrushes of this embodiment, and the embodiment of the handle 10 for toothbrushes is demonstrated together.

As shown particularly in FIGS. 1 to 3, the toothbrush handle 10 of the present embodiment includes a bristle-implanted hole forming layer 20 and a bristle-implanted hole non-forming layer 30 which have the same outer edge shape in plan view and are laminated in the thickness direction. Characteristically, these

layers

20 and 30 are layers derived from the multilayer paper 10M or multilayer paper, and the lamination direction of the flocked hole forming layer 20 and the non-flocked hole forming layer 30 The stacking direction of the paper layers in the paper 10M or the layers derived from the multilayer paper coincides. The multilayer paper-derived layer is a layer whose precursor is the multilayer paper 10M, and for example, a layer that has undergone an appropriate treatment for further increasing the strength of the multilayer paper 10M. More specifically, a layer formed by pressing the multi-layered paper 10M, a layer formed by compressing the multi-layered paper 10M in the thickness direction, a layer formed by heat-treating the multi-layered paper 10M, and applying a coating agent to increase the strength of the multi-layered paper 10M. Examples include a coated layer and a layer containing an additive that improves the strength of the multilayer paper 10M. Further, it may be a layer obtained by subjecting the multi-layered paper 10M to a plurality of treatments, such as a layer obtained by impregnating an additive with compression treatment or heat treatment. In the following description, when describing matters common to the multilayer paper 10M constituting the flocked hole forming layer 20 and the flocked hole non-formed layer 30 and the multilayer paper 10M serving as the precursor of the layer derived from the multilayer paper, they will not be distinguished. It may simply be called multi-layered paper 10M. The multi-layered paper 10M may be commercially available, for example, Ellipra paper manufactured by Dainichi Paper Co., Ltd., and the like. The press working pressure when compressing the multilayer paper 10M in the thickness direction, the heating temperature when heat-treating, and the like are not necessarily limited.

Since the toothbrush handle 10 of the present embodiment is not made of plastic but is composed of at least one of the multi-layer paper 10M which is paper as described above and a layer derived from the multi-layer paper, plastic removal can be achieved. . With a single-layer paper material, it is difficult to increase the strength to the same level as with a plastic material, but the multilayer paper 10M has a plurality of laminated paper layers 60 and 51, so it can have sufficient strength. Since the toothbrush handle 10 of the present embodiment is composed of the multi-layered paper 10M or a layer derived from the multi-layered paper, the head portion 11 is inserted through the narrow neck portion 12, which is the same as a hard plastic general-purpose product. While achieving a thin and long shape as a whole in which the and the handle portion 13 are connected, it is possible to have sufficient strength and to have the same feeling of use as a general popular product made of hard plastic. Moreover, since the multi-layered paper is an aggregate of pulp fibers, it does not break in the oral cavity even if it is chewed with the teeth during use, and is sufficiently safe during use.

Here, the strength of the toothbrush handle 10 and the toothbrush 1 of the present embodiment is not necessarily limited, but the bending strength in the three-point bending load test by the secant method according to JIS K 7171 is 1 mm bending deflection. It is desirable that the bending load is 15 N or more at time and 30 N or more at 2 mm. In this three-point bending test, as shown in FIG. 11, the

support bases

80A and 80B are positioned at two points sandwiching the neck portion 12, and the distance L15 between the two points is 70 mm. One support base 80A is positioned at the head portion 11 (preferably at a position where the distance L16 from the tip is 15 mm), and the other support base 80B is preferably positioned at the handle portion 13. FIG. The load cell capacity is 1 kN, the indentation speed is 10 mm/min, the radius of the indenter 81 is R1=5 mm, and the radius of each support tip is R2=2 mm. The measurement sample is set so that the flocked portion faces upward, and the pushing position is set at a position where the distance L17 from the tip is 75 mm and a position closer to the handle than the center between the supports. With the above bending strength, it is easy to obtain the same feeling of use as general popular products made of hard plastic.

On the other hand, the toothbrush handle 10 and the toothbrush 1 of the present embodiment are not necessarily limited, but preferably have water resistance of 3 minutes or more, more preferably 5 minutes or more. Here, the water resistance means that each layer does not separate even if it is completely immersed in water, and that it does not hydrolyze. However, more preferably, it is particularly desirable that the bending strength in the three-point bending load test based on JIS K 7171 is maintained even after being immersed for 5 minutes.

On the other hand, the toothbrush handle 10 of this embodiment is characterized by a bristle-implanting hole-forming layer 20 in which a plurality of through holes 21H are formed at the head position 21, and a hole at the head position. Non-penetrating tufting holes 11</b>H are formed in the head portion 11 by laminating the tufting hole non-forming layer 30 . That is, the tufting holes 11H formed in the head portion 11 have a bottom portion, and the bottom portion is composed of the high-strength multi-layered paper 10M or the tufted-hole non-forming layer 30 which is a layer derived from the multi-layered paper. For this reason, in the toothbrush handle 10 of the present embodiment, bristles can be implanted by the flat wire driving technique, which is performed in conventional hard plastic general-purpose products. In other words, the multilayer paper 10M and the layers derived from the multilayer paper are a type of paper that is an aggregate of fibers, so they are excellent in micro-deformability and have a layer structure in which a plurality of paper layers are laminated. Excellent Z-axis strength. Therefore, if the head portion 11 has a structure in which layers of multi-layered paper or layers derived from multi-layered paper are laminated, when the flat wire is driven, the flat wire will firmly bite into the fibers, and the head portion will be less likely to break. Since there is little possibility of penetrating the bottom of the tufting hole 11H, tufting using a flat wire is easy.

Furthermore, in particular, in terms of ease of bristle implantation by the above-mentioned flat line driving, and in order to increase the rigidity and strength of the entire handle, the bristle bristle hole forming layer 20 and the bristle non-bristle hole forming layer 20 of the toothbrush handle 10 of the present embodiment. The forming layer 30 preferably contains a siloxane compound. When a siloxane compound is contained, the strength and water resistance of the multi-layered paper are increased due to the siloxane bond, resulting in a layer derived from the multi-layered paper. In particular, if the siloxane compound is contained in a range of the bristle-implanting hole non-forming layer 30 that includes the portion (head portion position) that is laminated on the through-hole 21H of the bristling-hole forming layer 20, the bristle-implanting hole may be damaged when the teeth are brushed. It is possible to suitably prevent a decrease in strength due to water accumulated in the pores 11H. Here, the siloxane compound may simply be coated on the outer surface of the toothbrush handle 10 as a surface coating. More preferably, the siloxane compound penetrates from the outer surface of the handle 10 to a certain depth, binds to the pulp fibers and cellulose fibers that constitute the multilayer paper and the layers derived from the multilayer paper, or coats the pulp fibers and cellulose fibers. It is desirable that it is contained in a manner that By doing so, the rigidity and strength of the entire handle are increased.

The siloxane compound is not necessarily limited as long as it has a siloxane bond, but since the toothbrush is inserted into the oral cavity, it is desirable that it has no or low toxicity to the living body. In addition, in order to make the handle 10 contain a siloxane compound, the toothbrush 1 or the handle 10 may be coated, coated, impregnated, or soaked with the siloxane compound. The alkoxysilane solution or the alkoxysilane solution processed product may be applied, coated, particularly impregnated, and then heated or heated and further compressed. In this way, the siloxane compound is contained in such a manner that it binds to the pulp fibers or cellulose fibers constituting the layers derived from the multilayer paper or coats the pulp fibers or cellulose fibers.

On the other hand, the toothbrush 1 and the handle 10 according to this embodiment may contain at least one of an antibacterial agent and an antiviral agent. In addition, known functional aids may be added as long as the effects of the present invention are not impaired. Antibacterial agents and antiviral agents are not limited, and known agents that can be used for toothbrushes can be used. In particular, since the toothbrush 1 and the handle 10 of the present embodiment are composed of the multilayer paper 10M, which is paper made from pulp fibers, or a layer derived from the multilayer paper, an antibacterial agent or the like is kneaded into a resin material like a plastic product. There is an advantage in that the antibacterial agent or antiviral agent can be easily imparted so as to penetrate into the paper layer by coating, coating, impregnation, dripping, or the like. An antibacterial agent and an antiviral agent can be applied together with the above siloxane compound. Furthermore, it can be applied together with a siloxane compound. Furthermore, the siloxane compound itself may have antiviral and antibacterial properties.

Here, the bristle-implanted hole forming layer 20 and the bristle-implanted hole non-forming layer 30 do not necessarily have to be a single layer, and may be a plurality of layers. The illustrated form shows a form of a two-layer bristle-implanted hole-forming layer 20 and one bristle-implanted hole-non-forming layer 30 . However, it is not limited to this laminated structure. Moreover, the handle 10 according to the present embodiment may have other layers as long as the effects of the present invention are not impaired. For example, there may be an adhesive layer that adheres between the layers. It should be noted that this adhesive must be able to achieve plastic elimination, and it is desirable to use, for example, a natural material or an adhesive derived from a natural material. Also, layers of materials other than plastic may be laminated so that the thickness of the handle portion 13 is increased so that it can be easily gripped by hand. Of course, this layer may be made of the same material as the multi-layered paper 10M for forming the bristle-implanted hole forming layer 20 and the bristle-implanted hole non-forming layer 30. FIG.

The multilayer paper 10M and the layer derived from the multilayer paper that constitute the flocked hole forming layer 20 and the flocked hole non-forming layer 30 are not necessarily limited, but the longitudinal direction from the head portion 11 side to the handle portion 13 side is the length of the paper. It is desirable that they are arranged so as to match the direction (MD direction). By aligning the longitudinal direction (MD direction) of the paper with the longitudinal direction, the toothbrush is hard to break and easy to bend.

The method of joining the layers constituting the bristle-implanted hole forming layer 20 and the bristle-implanted hole non-forming layer 30 is not necessarily limited. As long as the effects of the present invention are not hindered, they can be joined by joining means such as joining by a locking structure, which is also called adhesive, crimping means, crimping means, eyelet means, wedge means, stapling means, coreless staples, and the like. can. Also, as the joining means, a plurality of types of joining means may be used together. As adhesives for joining, starch, various modified starches, modified cellulose such as carboxymethyl cellulose, water-soluble polymer adhesives such as polyvinyl alcohol, water-based emulsion resins such as acrylic acid esters and vinyl acetate, etc. may be used. good. Those derived from natural materials such as starch and cellulose are desirable from the viewpoint of environmental load. Crimping for joining, rivets constituting eyelets, and staple needles should be made of wood or metal other than plastic, and materials other than plastic should be used. One of the preferred joining means and, for example, as shown in FIG. 4A and FIG. and by pressing the

tip portions

70t, 70t into at least the adjacent layers to mechanically join the layers to each other. In this locking structure, a half-cut line may be provided at least at the same position in plan view as the edge 70e of the cut-and-raised piece 70 in the adjacent layer so that the tip portion 70t can be easily inserted. In the toothbrush handle 10 and the toothbrush 1 of the present embodiment, the handle is the multi-layered paper 10M or a layer derived from the multi-layered paper, and is made of a paper material having elasticity. can be joined. This locking structure is desirable in that it does not require any other parts because the layer 20 with bristle bristle holes and the layer 30 without bristle bristle holes themselves are joined by engagement. However, as described above, a mechanical locking structure including this locking structure and an adhesive may be used together. Even in this case, there is an advantage that the amount of adhesive used can be reduced. As another locking structure, although not shown, a portion of the handle is pressed in the thickness direction from the front and back surfaces of the handle so that the pressed portion bites into at least the adjacent layer, thereby locking the pressed portion. You may make it crimp-join by making it align.

Here, the multilayer paper 10M constituting the flocked hole forming layer 20 and the flocked hole non-forming layer 30, and the multilayer paper 10M serving as the precursor of the layer derived from the multilayer paper, have a basis weight of 700 g/m ² or more, more preferably 850 g/m ² or more, particularly preferably 950 g/m ² or more. With the multi-layered paper 10M within this range, it is easy to obtain sufficient rigidity. In addition, multi-layered paper having this basis weight can easily have sufficient rigidity and strength, and can easily have the same feeling of use as general popular products made of hard plastic. Although the upper limit of the basis weight of the multi-layered paper 10M is not limited, there is a risk that creases may easily occur with a calender roll or the ^like during papermaking. ² is more preferred. The paper thickness is preferably 900 μm or more and 1,500 μm or less, more preferably 1000 μm or more and 1,350 μm or less. The basis weight is a value measured in accordance with "Paper and paperboard - Basis weight measurement method" described in JIS P 8124 (2011), and the paper thickness is a value described in JIS-P8118 (2014) "Paper and paperboard - test methods for thickness and density".

Note that the multilayer paper 10M constituting the flocked hole forming layer 20 and the flocked hole non-forming layer 30, and the multilayer paper 10M serving as the precursor of the layer derived from the multilayer paper, are fibers derived from natural materials that do not contain synthetic fibers including plastics. It is desirable that the paper consists of only Preferably, the paper is made of pulp fibers only.

Preferred constituent pulp fibers are softwood kraft pulp such as unbleached softwood kraft pulp (NUKP), semi-bleached softwood kraft pulp (NSBKP), bleached softwood kraft pulp (NBKP), unbleached hardwood kraft pulp (LUKP), and semi-bleached hardwood. Hardwood kraft pulp such as kraft pulp (LSBKP) and bleached hardwood kraft pulp (LBKP). It is particularly preferable to use bleached softwood kraft pulp and bleached hardwood kraft pulp because it is easy to achieve both appearance and strength of the product after processing. Other pulps include chemical pulps such as waste paper pulp, hardwood sulfite pulp and softwood sulfite pulp, or various known pulps such as pulp chemically or mechanically produced from non-wood fibers such as kenaf, hemp, and reeds. An appropriate combination of pulps may be used.

The multilayered paper 10M constituting the flocked hole forming layer 20 and the flocked hole non-forming layer 30, and the multilayered paper 10M serving as the precursor of the layer derived from the multilayer paper, are measured in accordance with JIS P 8113 (2006). Both the directional and transverse tensile strengths are desirably greater than or equal to 50 kN/m. If it has this tensile strength, it will be easy to secure strength as a toothbrush.

In addition, the multilayer paper 10M constituting the flocked hole forming layer 20 and the flocked hole non-forming layer 30, and the multilayer paper 10M serving as a precursor of the layer derived from the multilayer paper, contain a sizing agent and a paper strength enhancer as papermaking additives. It is desirable to add at least one of Easy to adjust to desired intensity.

Styrene sizing agents, alkyl ketene dimers (AKD), alkenyl succinic anhydrides (ASA), neutral rosin sizing agents, rosin sizing agents, modified rosin emulsion sizing agents, and the like can be used as sizing agents. Among these, rosin sizing agents and modified rosin emulsion sizing agents are preferred. The rosin sizing agent is not particularly limited. Rosin-based substances include, for example, rosins such as gum rosin, wood rosin, and tall oil rosin modified with α,β-unsaturated carboxylic acids such as fumaric acid, maleic acid, and acrylic acid, or their anhydrides; Rosin esters obtained by reacting polyhydric alcohols such as glycerin, trimethylolethane, trimethylolpropane, pentaerythritol and diglycerin can be mentioned. The rosin sizing agent also includes those obtained by emulsifying these alone or a mixture thereof, and those obtained by emulsifying them alone and then mixing them. Furthermore, emulsified products to which various polymers are added in order to further improve size development are also included.

As the paper strength enhancer, various known ones such as polyacrylamide resin, polyamide resin, polyamine resin, acrylic resin, melamine resin, urea resin, and polyamide epichlorohydrin resin can be used. Among these, amphoteric paper strength agents are preferably used. Examples of amphoteric polyacrylamides include copolymers of acrylamide with anionic monomers and cationic monomers, Mannich-modified copolymers of acrylamide with anionic monomers, Hoffmann decomposition products, and the like. In particular, since amphoteric polyacrylamide has a self-fixing function, even if it is added to improve inter-paper strength, it does not become excessively cationic. can be established in

The amount of sizing agent added is preferably 0.5 kg/t or more and 5.0 kg/t or less in solid content. The amount of the paper strength agent to be added is preferably 12 kg/t or more and 30 kg/t or less in terms of solid content. In addition, "kg/t" shows the mass (kg) per 1t of pulp. By setting the amount of the sizing agent to be added within this range, the water resistance can be improved, making it suitable for use in toothbrushes.

The multi-layered paper 10M can contain various other additives within a range that does not impair the intended effects of the present invention. For example, polyvinyl alcohol, wax, or the like can be applied.

The multilayer paper 10M is preferably a multilayer paper 10M having surface layers 51, 51 and an intermediate layer 60, as shown in the schematic cross-sectional view of FIG. It is difficult to increase the strength of a single-layer paper material compared to a plastic material, but the multilayer paper 10M can easily have the same strength. In addition, the multi-layer paper 10M can change the characteristics of each layer, and can easily secure elasticity while maintaining high density, and can easily impart water resistance. For example, by combining a pair of surface layers 51 that are hard but tend to break easily with water resistance, and a flexible middle layer 60, water resistance, toughness, and durability can be improved. Therefore, the water resistance of the entire toothbrush is increased, and the handle, especially the neck portion, is easily bent, and the toothbrush can easily have the same feeling of use as a popular product made of hard plastic. The multilayer paper can be produced by multilayer papermaking. Such characteristics of the multi-layer paper 10M are not lost even if the multi-layer paper 10M is compressed in the thickness direction by, for example, press working or the like to form a layer derived from the multi-layer paper.

Although the number of layers of the multi-layered paper 10M is not limited, it is preferable that the number of layers is 5 to 9, and the number of layers of the middle layer 60 is 3 or more, especially 5. In particular, the embodiment shown in FIG. 5 has three intermediate layers 60 . When the total number of middle layers 60 is three or more, the toughness and durability of the multilayer paper can be further improved. The upper limit of the total number of intermediate layers 60 is preferably seven layers or less from the viewpoint of maintaining interlaminar strength. In addition, three to seven layers are easy to operate while maintaining interlaminar strength in the case of using a cylinder multi-cylinder type combined paper machine.

The basis weights of the surface layer 51 and the middle layer 60 in the multilayer paper 10M are not particularly limited, but the basis weight of the surface layer 51 is preferably 50.0 g/m ² or more and 200.0 g/m ² or less per layer. Moreover, the basis weight of the entire middle layer is preferably 400 g/m ² or more and 950 g/m ² or less. Further, the ratio of the total basis weight of the pair of surface layers 51, 51 to the total basis weight of the multilayer paper is preferably 20.0% or more and 35.0% or less. The rigidity of the pair of surface layers is high, and the softness of the middle layer is excellent. In addition, in the multilayer paper, by setting the ratio of the total basis weight of the pair of surface layers to the above range, it is possible to impart the property of being resistant to bending. The density is preferably 0.65-1.00 g/cm ³ , particularly 0.73-0.85 g/cm ³ . When the density of the multi-layered paper is within this range, the multi-layered paper has a high basis weight, excellent rigidity, and resistance to folding.

In addition, in the multi-layered paper 10M, it is preferable to add at least one of the above sizing agent and paper strength agent as a papermaking additive to each layer of the surface layers 51, 51 and the middle layer 60. In this case, the amount of the sizing agent added to the surface layer 51 is preferably 0.5 kg/t or more and 5.0 kg/t or less in solid content. Moreover, the amount of the sizing agent added to the middle layer 60 is preferably 2.0 kg/t or more and 5.0 kg/t or less in solid content. Moreover, the amount of the paper strength enhancer added to each layer is preferably 12 kg/t or more and 30 kg/t or less in terms of solid content. Within this range, it is easy to impart various paper strengths such as interlaminar strength to multi-layered paper.

In addition, it is desirable that the pulp fibers constituting each layer of the multilayer paper 10M are blended by mixing the softwood kraft pulp and the hardwood kraft pulp with the pulp of the surface layer 51 and the middle layer 60 . The thickness of the paper becomes thicker, ensuring sufficient strength. In addition, by setting the mass ratio (%) of the softwood kraft pulp and the hardwood kraft pulp in the surface layer to 5/95 or more and 20/80 or less, a large amount of hardwood kraft pulp that is rigid and easily densified is contained, and the surface layer is high. It has high density and rigidity, and tends to be excellent in strength. As for the surface layer and the middle layer, it is desirable that the mass ratio (%) of the softwood kraft pulp and the hardwood kraft pulp is 20/80 or more and 40/60 or less. In particular, if the softwood kraft pulp, which is more flexible than the surface layer, is contained in an amount of 5% or more, better flexibility is provided.

In addition, the multilayer paper 10M has a Taber stiffness of 125 mN·m or more, preferably 150 mN·m or more in the longitudinal direction, and 40 mN·m or more in the transverse direction, measured according to JIS P 8125 (2000). , preferably 60 mN·m or more. With this multi-layered paper 10M, it is possible to achieve sufficient rigidity and strength, and it is easy to have the same feeling of use as general products made of hard plastic.

Furthermore, the multi-layered paper 10M is tested according to JAPAN TAPPI Paper Pulp Test Method No. 18-1:2000, the Z-axis strength is 400 kN/m ² or more, preferably 450 kN/m ² or more. The flocked hole forming layer, the flocked holes of the flocked hole formed layer, and the flocked hole non-formed layer can be easily manufactured by punching such as Thomson processing or cutting using a cutting plotter or the like.

The size and specific size of the toothbrush handle 10 and the toothbrush 1 of the present embodiment are not limited, but as shown in FIGS. The width L3 of the head portion 11 is 9.5 to 15.0 mm, the thickness L4 of the handle of the head portion is 3.0 to 6.0 mm, the length L5 of the head portion 11 is 20.0 to 30.0 mm, and the handle portion 13 The width L6 can be 10.5-14.5 mm, the length L7 of the neck portion 12 can be 30-40 mm, and the width L8 of the neck portion 12 can be 4-8 mm. With this shape, the head portion 11 and the handle portion 13 are connected via the narrow neck portion 12 to form a thin and elongated shape as a whole, similar to general popular products made of hard plastic. It can be made to have the same feeling of use as general popular products. In addition, sufficient strength and water resistance can be easily ensured by the multilayer paper or layers derived from the multilayer paper.

In the toothbrush handle 10 of the present embodiment, a plurality of filaments are bundled in each of the tuft holes 11H and folded in half to form a toothbrush 1 by a known bristling method using a flat wire. be able to. The thickness of the flat wire and the margin of engagement of the flat wire with respect to the tufting holes may be appropriately designed. As shown in FIG. 6, the diameter L9 of the through holes 21H in the bristle bristle hole forming layer 20 and the bristle holes 11H in the head portion 11 formed thereby is not limited, but is 1.2 to 2.0 mm. It is about 4 mm, preferably 1.3 to 1.9 mm. The number and arrangement of the tufting holes 11H in the head portion 11 are not necessarily limited. However, although the distance L10 from the outer edge of the head portion 11 to the tufting hole 11H is not limited, it is preferably 0.7 to 1.9 mm. The interval L11 between the tufting holes is also not limited, but is preferably 0.7 to 1.9 mm. With this distance and feeling, it is difficult for cracks to occur due to flat wire driving, and it is possible to obtain a feeling of use close to that of general products.

The filaments of the bristle bundles 2 that are planted in the tufting holes 11H and constitute a part of the toothbrush are not limited. Artificial hair made of resin materials such as nylon, polyester, polyolefin, etc. may be used, but from the viewpoint of eliminating plastics, biomass filaments derived from castor oil collected from castor beans, natural hair such as pig hair and horse hair, and natural hair made from manila hemp etc. Desirably, filaments derived from natural sources, such as paper threads composed of fibers. In addition, when artificial hair is implanted, the head part should be easily separated from other parts by providing ruled lines, perforations, half slits, etc. , only the head portion may be separately discarded.

Although the manufacturing method of the toothbrush of this embodiment is not limited, for example, it can be preferably manufactured as follows. First, as shown in FIG. 9, a plurality of

multi-layer papers

10m, 10m to be the bristle hole forming layer 20 are stacked and interleaved so as to secure the depth of the bristle hole 11H, and then the part that becomes the bristle hole 11H. A through-hole 21H is formed by punching out a chisel. This interleaving paper can be formed by press processing or adhesion processing. Next, as shown in FIG. 10, another multi-layered paper sheet 10s to be the flocked hole non-formed layer 30 is laminated on one side of the interleaf laminated

multilayered paper sheets

10m and 10m to be the flocked hole formed layer 20, Both are further interleaved. This interleaving paper can be formed by press processing or adhesion processing. Next, the outer edge of the toothbrush handle 10 is punched out to form individual handles 10 . Before or after this punching, for example, a treatment for containing a siloxane compound can be performed. Furthermore, press working may be performed at the same time as the punching. Next, when the individual handles are obtained, tufts of bristles are implanted into the bristle implant holes by a known flat wire driving method to obtain individual toothbrushes. In this manufacturing method, a plurality of patterns 10 can be manufactured from the

multi-layer paper sheets

10m, 10m, and 10s, and industrial and stable manufacturing is possible.

Next, the bending strength of the toothbrush according to the present invention (Examples 1 and 2) was measured and compared with conventional plastic toothbrushes (Comparative Examples 1 and 2).

The test method was a three-point bending load test by the secant method in accordance with JIS K 7171. As shown in FIG. L15 was set to 70 mm. One of the support bases 80A was positioned at the head portion 11 and positioned at a distance L16 of 15 mm from the tip. The load cell capacity was set to 1 kN, the indentation speed was set to 10 mm/min, the radius of the indenter 81 was R1=5 mm, and the radius of each support tip was R2=2 mm. The measurement sample was set so that the flocked portion faced upward, and the pushing position was set at a position where the distance L17 from the tip was 75 mm.

The pattern body according to Example 1 had a three-layer structure consisting of one bristle hole forming layer and two bristle non-forming layers, and each layer was adhered with a polyvinyl alcohol adhesive. Also, the hair tresses were implanted by flat wire driving. Each layer consisted of a multi-layered paper with a basis weight of 1000 g/m2 containing a siloxane compound. As the multilayer paper, a surface layer with a basis weight of 140 g/m 2 and a middle layer with a total basis weight of 720 g/m 2 (three layers in total) were used. In Example 2, the toothbrush according to Example 1 was immersed in water for 5 minutes. Comparative Example 1 is a commercially available plastic toothbrush for general household use, and Comparative Example 2 is a commercial plastic toothbrush distributed at lodging facilities.

The results of the bending strength test are shown in Fig. 12. As shown in FIG. 12, it can be confirmed that the toothbrush according to the present invention, which is made of multi-layered paper, can maintain bending strength similar to that of a plastic toothbrush even after being immersed in water for 5 minutes. In addition, it cannot be confirmed that the strength of the tufts is reduced even though the tufts are implanted by flat wire driving.

Therefore, according to the present invention, a plastic that has the same feeling of use as a popular hard plastic product and can be easily manufactured by flat wire driving in the same way as a popular hard plastic product. A free toothbrush handle and a toothbrush having the handle are provided.

DESCRIPTION OF SYMBOLS 1... Toothbrush, 2... Bristles, 10... Handle, 10M, 10m, 10s... Multilayer paper, 11... Head part, 11H... Flocking hole, 12... Neck part, 13... Handle part, 20... Flocking hole formation layer, 21 Position of head portion 21H Through hole 30 Non-implanted layer 51 Surface layer 60

Intermediate layer

80A, 80B Support base 81 Indenter L1 Total length of toothbrush and toothbrush handle, L2... thickness of toothbrush handle L3... width of head part L4... thickness of head part L5... length of head part L6... width of handle part L7... length of neck part L8... neck L9: diameter of tufting holes (through holes), L10: distance from outer edge of head portion to tufting holes, L11: interval between tufting holes (between through holes), L15: distance between supports, L16 ... distance from the tip to the support, L17 ... distance from the tip to the pushing position.

Claims

A handle for a toothbrush, comprising a head portion having a plurality of bristle flocking holes into which tufts are flocked, a neck portion extending from the head portion, and a handle portion extending from the neck portion,
One or a plurality of bristle-implanted hole-formed layers having a plurality of through-holes formed at the head position and one or a plurality of bristle-implanted hole non-formed layers having no holes formed at the head position are laminated to form a head. A handle for a toothbrush, characterized in that it has non-penetrating tuft holes in a part thereof, and the bristle pore forming layer and the bristle non-forming layer are multilayer paper or a layer derived from the multilayer paper.
The multi-layered paper or the layer derived from the multi-layered paper constituting the bristle-implanted hole forming layer and the bristle-implanted hole non-forming layer is such that the tips of cut and raised pieces formed on part of the front and back surfaces of the pattern are inserted into at least adjacent layers. 2. The toothbrush handle of claim 1, wherein the layers are joined by at least one of an interengaging locking structure and an adhesive.
The handle for a toothbrush according to claim 1 or 2, which contains a siloxane compound.
A toothbrush handle having a head portion having a plurality of flocking holes into which tufts are flocked, a neck portion extending from the head portion, and a handle portion extending from the neck portion,
A toothbrush in which bristle bundles are implanted in the bristle holes by flat line driving,
The handle for the toothbrush,
One or a plurality of bristle-implanted hole-formed layers having a plurality of through-holes formed at the head position and one or a plurality of bristle-implanted hole non-formed layers having no holes formed at the head position are laminated to form a head. has non-penetrating tufting holes in the part, and the flocking hole-formed layer and the non-flocked hole-forming layer are multi-layered paper or layers derived from multi-layered paper,
A toothbrush characterized by:
The multi-layered paper or the layer derived from the multi-layered paper constituting the bristle-implanted hole forming layer and the bristle-implanted hole non-forming layer is such that the tips of cut and raised pieces formed on part of the front and back surfaces of the pattern are inserted into at least adjacent layers. 5. The toothbrush of claim 4, wherein the layers are joined by at least one of an interengaging locking structure and an adhesive.
The toothbrush according to claim 4 or 5, wherein the handle contains a siloxane compound.
The toothbrush according to any one of claims 4 to 6, wherein the bristle bundle is a bundle of at least one selected from the group consisting of biomass filaments, natural bristles and paper threads.