Handle of razor

Abstract

To provide a handle of a razor excellent in injection molding properties.SOLUTION: In a razor handle (10), a space section (S) of a gripping part has a top wall part (1a), and two side wall parts (1b, 1c) connecting to the top wall part (1a), and the top wall part (1a) is thicker than the side wall parts (1b, 1c) in an LD direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a handle of a razor.

Background Art

[0002] A razor including a razor head and a handle (also called a handpiece or a holder) to which the razor head is attached is known. Such a razor is disclosed in, for example, Patent Document 1. In the razor of Patent Document 1, the handle is mainly formed of a hard resin such as ABS resin. Further, the handle has conventionally been manufactured by injection molding.

[0003] On the other hand, in recent years, from the viewpoint of consideration for the environment at the time of and after disposal of resin products, the development of biodegradable resins (hereinafter, may also be referred to as "biodegradable resins") has been actively carried out. As one of such biodegradable resins, polyhydroxyalkanoic acid (hereinafter, PHA) is known.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, it has been found that when manufacturing the handle of a conventional razor by injection molding, short shots or burrs may occur, and there is room for improvement in terms of injection moldability.

[0006] One aspect of the present invention aims to realize a handle of a razor in which short shots and burrs are less likely to occur and the injection moldability is good.

Means for Solving the Problems

[0007] In order to solve the above problems, the handle of a razor according to one aspect of the present invention has a gripping portion and a mounting portion for mounting a razor head. The mounting portion includes a handle body connected to one end in the longitudinal direction of the gripping portion. The gripping portion has a space portion that is open on a first side in the height direction and extends in the length direction. The space portion has a top wall portion arranged on a second side opposite to the first side in the height direction and two side wall portions connected to the top wall portion. Along the length direction, the top wall portion is thicker than the side wall portions.

Advantages of the Invention

[0008] According to one aspect of the present invention, it is possible to realize a handle of a razor that is less likely to cause short shots or burrs and has good injection moldability.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0010] One embodiment of the present invention will be described in detail below. Unless otherwise specified in this specification, "A to B" representing a numerical range means "A or more and B or less". Also, all the documents described in this specification are incorporated herein by reference as references.

[0011] (Configuration of Razor Handle) FIG. 1 is a perspective view showing the configuration of the razor handle 10 according to the present embodiment. FIG. 2 is a top view, a bottom view, a side view, a front view, and a rear view showing the configuration of the razor handle 10 according to the present embodiment. In FIG. 2, the razor head H attached to the razor handle 10 is schematically shown. FIG. 3 is a top view showing the configuration of the razor handle 10 according to the present embodiment, and a cross-sectional view taken along line I-I, line II-II, line III-III, and line IV-IV in the top view.

[0012] As described in the drawings, in this specification, the longitudinal direction of the razor handle 10 is referred to as the LD direction. In the LD direction, one side (front side) is referred to as the LDa side, and the other side (rear side) is referred to as the LDb side. Further, the short-side direction of the razor handle 10 perpendicular to the LD direction is referred to as the WD direction (width direction). And the direction perpendicular to both the LD direction and the WD direction is referred to as the HD direction (height direction). In the HD direction, one side (upper side) is referred to as the HDa side, and the other side (lower side) is referred to as the HDb side. When the razor head H is attached to the razor handle 10 to form a T-shaped razor, it can be said that the WD direction is the longitudinal direction of the razor head H attached to the razor handle 10.

[0013] As shown in FIGS. 1 and 2, the razor handle 10 according to the present embodiment includes a handle body 11. The handle body 11 has a grip portion 1 and a mounting portion 2. As shown in FIG. 2, the razor head H is attached to the mounting portion 2. Further, the mounting portion 2 is connected to the end portion on the LDa side in the LD direction in the grip portion 1.

[0014] Further, the grip portion 1 includes a space portion S. In the grip portion 1, the space portion S has the HDb side (first side) in the HD direction open and extends in the LD direction. The space portion S has a top wall portion 1a, two side wall portions 1b and 1c, a rear wall portion 1d, and a front wall portion 1e.

[0015] The top wall portion 1a is arranged on the HDa side (second side) opposite to the HDb side in the HD direction. In the space portion S, the top wall portion 1a forms the wall surface on the HDa side and extends in the LD direction.

[0016] The side wall portions 1b and 1c are connected to the top wall portion 1a. The side wall portions 1b and 1c protrude toward the HDb side with respect to the top wall portion 1a and are connected to both ends of the top wall portion 1a in the WD direction. Also, the side wall portions 1b and 1c extend in the LD direction while facing each other in the WD direction. In the space portion S, the side wall portions 1b and 1c constitute the side wall surfaces in the WD direction.

[0017] The rear wall portion 1d is connected to the top wall portion 1a and the side wall portions 1b and 1c. The rear wall portion 1d protrudes toward the HDb side with respect to the top wall portion 1a and is connected to the end portion on the LDb side of the top wall portion 1a. In the space portion S, the rear wall portion 1d constitutes the wall surface on the LDb side.

[0018] The front wall portion 1e is connected to the top wall portion 1a and the side wall portions 1b and 1c. The front wall portion 1e protrudes toward the HDb side with respect to the top wall portion 1a and is connected to the end portion on the LDa side of the top wall portion 1a. In the space portion S, the front wall portion 1e constitutes the wall surface on the LDa side.

[0019] Since it has the space portion S as described above, when the top wall portion 1a is on the upper side, the cross-sectional shape of the gripping portion 1 perpendicular to the LD direction is an inverted U shape (see FIG. 3). The inverted U shape is formed by the top wall portion 1a and the side wall portions 1b and 1c. Note that, as the cross-sectional shape of the gripping portion 1 shown in FIG. 3, the connecting portions between the top wall portion 1a and the side wall portion 1b and between the top wall portion 1a and the side wall portion 1c were rounded shapes. However, the inverted U shape is not limited to the shape shown in FIG. 3. For example, the inverted U shape may be such that the connecting portions between the top wall portion 1a and the side wall portion 1b and between the top wall portion 1a and the side wall portion 1c are angular shapes.

[0020] Here, the handle body 11 of the razor handle 10 is an injection molded body. That is, the gripping portion 1 and the mounting portion 2 are integrally injection molded. And, as shown in FIG. 1, the gripping portion 1 has a gate trace G at the time of injection molding. In the gripping portion 1, the gate trace G is at the other end opposite to one end in the LD direction connecting to the mounting portion 2. That is, the gate trace G is formed at the time of injection molding of the handle body 11, and in the gripping portion 1, it is formed at the end on the LDb side. From the viewpoint of reducing the pressure loss at the time of injection molding, it is preferable that the gate trace G is formed at the end on the LDb side of the top wall portion 1a.

[0021] Therefore, in the injection molding of the handle body 11, the resin composition as the raw material flows into the cavity of the mold of the handle body 11 from (1) the gate (the position corresponding to the gate trace G), (2) flows in the LD direction in the order of the gripping portion 1 and the mounting portion 2 from the gate, and (3) reaches the end on the LDa side of the handle body 11.

[0022] In the injection molding as described above, in the cavity of the mold of the handle body 11, there may be a case where the resin composition as the raw material does not reach the end on the LDa side of the handle body 11, or gas may be generated in the cavity due to the resin composition, and filling failure (short shot) may occur. As a countermeasure on the molding condition side, it is possible to compensate for such insufficient filling by increasing the injection pressure and / or the temperature of the resin composition. However, when the injection pressure or the resin temperature is increased, burrs may occur on the injection molded product of the handle body 11, and the appearance of the handle body 11 and / or the assemblability between the razor head H and the handle body 11 may deteriorate.

[0023] Therefore, according to the razor handle 10 according to the present embodiment, in the LD direction, the top wall portion 1a is thickened compared to the side wall portions 1b and 1c. In other words, in the LD direction, the top wall portion 1a is thickened compared to the side wall portions 1b and 1c over the region from the connecting portion with the rear wall portion 1d to the connecting portion with the front wall portion 1e.

[0024] FIG. 3 shows, as cross-sectional views perpendicular to the LD direction of the gripping portion 1, the cross-sectional views taken along line I-I, line II-II, line III-III, and line IV-IV in order from the LDa side to the LDb side. As shown in FIG. 3, in all of the cross-sectional views taken along line I-I, line II-II, line III-III, and line IV-IV, the thickness Ta of the top wall portion 1a is larger than the thickness Tb of the side wall portion 1b and the thickness Tc of the side wall portion 1c. The top wall portion 1a is thickened compared to the side wall portions 1b and 1c.

[0025] Thus, according to the razor handle 10, the top wall portion 1a is thickened compared to the side wall portions 1b and 1c. Therefore, in the cavity of the mold of the handle body 11, the molding space of the top wall portion 1a is larger than the molding spaces of the side wall portions 1b and 1c. For this reason, when injection molding the handle body 11, the resin composition as a raw material easily passes through the molding space of the top wall portion 1a and reaches the end portion on the LDa side of the handle body 11, and it becomes difficult for filling defects to occur. As a result, injection molding can be performed without excessively increasing the injection pressure and / or the temperature of the resin composition, so that short shots and burrs are less likely to occur in the injection molded product of the handle body 11, and the injection moldability is improved.

[0026] Also, from the viewpoint of improving the injection moldability as described above, the top wall portion 1a is preferably thickened by 1.2 to 5.0 times, more preferably 1.3 to 3.5 times, compared to the side wall portions 1b and 1c. In other words, referring to FIG. 3, the thickness Ta / thickness Tb and the thickness Ta / thickness Tc are preferably 1.2 to 5.0, and more preferably 1.3 to 3.5.

[0027] Furthermore, from the viewpoint of improving the injection moldability as described above, as going from the LDb side to the LDa side, the thickness Ta / thickness Tb and the thickness Ta / thickness Tc preferably have no biased distribution and are uniform within the above numerical range. For example, in a biased distribution where the thickness Ta / thickness Tb and the thickness Ta / thickness Tc become larger on the LDa side, the moldability may deteriorate.

[0028] As specific dimensions of the thickness Ta, thickness Tb, and thickness Tc shown in FIG. 3, the following dimensions can be mentioned. In the cross-sectional view taken along line I-I, thickness Ta = 3.1 mm, thickness Tb = thickness Tc = 1.6 mm. In the cross-sectional view taken along line II-II, thickness Ta = 2.8 mm, thickness Tb = thickness Tc = 1.8 mm. In the cross-sectional view taken along line III-III, thickness Ta = 2.8 mm, thickness Tb = thickness Tc = 1.8 mm. In the cross-sectional view taken along line IV-IV, thickness Ta = 2.81 mm, thickness Tb = thickness Tc = 1.37 mm.

[0029] (Configuration of the razor) The razor has a configuration in which the razor head H is attached to the above-described razor handle 10 (see FIG. 2). That is, the razor according to the present embodiment includes the above-described razor handle 10 and the razor head H. As long as the razor head H can be attached to the attachment portion 2, a conventionally known one can be adopted. The razor head H can adopt, for example, a triple blade, a swing type, etc. Further, the attachment portion 2 of the razor handle 10 can be appropriately set according to the configuration of the razor head H.

[0030] (Regarding the raw material of the handle body) In the razor handle 10 according to the present embodiment, the handle body 11 may contain any resin as long as it exhibits the above-described effect of good injection moldability. The handle body 11 preferably contains a biodegradable resin as a base resin.

[0031] Furthermore, the biodegradable resin is not particularly limited, and examples thereof include polyhydroxyalkanoic acid-based resins, polylactic acid, polyglycolic acid, polybutylene succinate, polybutylene succinate adipate, polybutylene adipate terephthalate, polybutylene succinate terephthalate, polycaprolactone, etc. Among these, the biodegradable resin is preferably a polyhydroxyalkanoic acid-based resin (hereinafter, may be referred to as a PHA-based resin). In this specification, the "PHA-based resin" is a general term for polymers having hydroxyalkanoic acid as a monomer unit.

[0032] Particularly preferably, the PHA-based resin is a poly(3-hydroxyalkanoate) - based resin (hereinafter sometimes referred to as a P3HA-based resin). In the present specification, the "P3HA-based resin" refers to a 3-hydroxyalkanoic acid repeating unit represented by the general formula: [-CHR-CH2-CO-O-] (wherein R is an alkyl group represented by C n H 2n+1 and n is an integer of 1 or more and 15 or less).) is a polyhydroxyalkanoate containing as a repeating unit.

[0033] More specifically, the P3HA-based resin preferably contains a 3-hydroxybutyrate (3HB) unit. As the P3HA-based resin containing a 3HB unit, preferably, poly(3-hydroxybutyrate) (P3HB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P3HB3HV), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (P3HB3HH), poly(3-hydroxybutyrate-co-3-hydroxyvalerate-co-3-hydroxyhexanoate) (P3HB3HV3HH), poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P3HB4HB), poly(3-hydroxybutyrate-co-3-hydroxyoctanoate), and poly(3-hydroxybutyrate-co-3-hydroxydecanoate) are selected from the group consisting of. The P3HA-based resin may contain only one kind or two or more kinds.

[0034] As the P3HA-based resin, a P3HA-based resin produced by microorganisms (microorganism-produced P3HA-based resin) is preferable. The microorganism-produced P3HA-based resin is usually composed of only D-form (R-form) polyhydroxyalkanoate monomer units. Among the microorganism-produced P3HA-based resins, P3HB, P3HB3HH, P3HB3HV, P3HB3HV3HH, and P3HB4HB are preferable, and P3HB, P3HB3HH, P3HB3HV, and P3HB4HB are more preferable from the viewpoint of easy industrial production.

[0035] The P3HA-based resin can also be produced, for example, by the method described in International Publication No. WO2010 / 013483. Examples of commercially available P3HA-based resins include "Kaneka Biodegradable Polymer PHBH (registered trademark)" of Kaneka Corporation, etc.

[0036] Further, the P3HA-based resin contains at least one kind of copolymer of 3HB units and other hydroxyalkanoate units, and the 3-hydroxybutyrate units in the poly(3-hydroxyalkanoate) - based resin are 65.0 to 99.0 mol%, preferably 68.0 to 98.5 mol%, more preferably 70.0 to 98.5 mol%, and still more preferably 70.0 to 98.0 mol% in all repeating units (100 mol%).

[0037] When the composition ratio of the 3HB repeating units is 90.0 mol% or more, the rigidity of the P3HA-based resin is further improved, the crystallization rate becomes faster, the burrs are reduced, and the productivity tends to be improved. On the other hand, when the composition ratio of the 3HB repeating units is 99.0 mol% or less, the melting point is lower than the thermal decomposition temperature, so stable and continuous production becomes possible. The monomer composition ratio of the P3HA-based resin can be measured by gas chromatography or the like (see, for example, International Publication No. WO2014 / 020838).

[0038] The molecular weight of the P3HA-based resin is not particularly limited as long as it exhibits substantially sufficient physical properties for the intended use. The range of the weight average molecular weight of the P3HA-based resin is preferably 100,000 to 1,000,000, more preferably 150,000 to 700,000, still more preferably 200,000 to 500,000, and particularly preferably 250,000 to 450,000. When the weight average molecular weight is 100,000 or more, appropriate mechanical strength can be obtained. Also, when the molecular weight is 1,000,000 or less, an increase in the melt viscosity can be suppressed, and the moldability is excellent.

[0039] The method for measuring the weight-average molecular weight uses gel permeation chromatography (GPC) (manufactured by Showa Denko K.K., "Shodex GPC-101"), with a polystyrene gel (manufactured by Showa Denko K.K., "Shodex K-804") used for the column, chloroform as the mobile phase, and can be determined as the molecular weight in terms of polystyrene. At this time, the calibration curve is created using polystyrene with a weight-average molecular weight of 31,400, 197,000, 668,000, and 1,920,000. As the column in the GPC, a column appropriate for measuring the molecular weight may be used.

[0040] Also, the material of the razor handle according to this embodiment may contain additives that can be used together with the thermoplastic resin as long as the effects of the present invention are not inhibited. Such additives include inorganic fillers such as talc, calcium carbonate, mica, and silica, colorants such as pigments and dyes, odor absorbers such as activated carbon and zeolite, fragrances such as vanillin and dextrin, plasticizers, antioxidants, anti-oxidants, weather resistance improvers, ultraviolet absorbers, crystal nucleating agents, lubricants, mold release agents, water repellents, antibacterial agents, sliding property improvers, and the like. Only one kind of additive may be included, or two or more kinds may be included. The content of these additives can be appropriately set by those skilled in the art according to the purpose of use.

[0041] According to this embodiment, when a P3HA-based resin is used as the raw material of the razor handle, marine pollution caused by waste can be suppressed, and thereby, for example, it can contribute to the achievement of sustainable development goals (SDGs) such as Goal 12 "Ensure sustainable consumption and production patterns" and Goal 14 "Conserve and use the oceans and marine resources in a sustainable manner for sustainable development".

[0042] The razor handle according to this embodiment is manufactured by injection molding. As the method of the injection molding, a conventionally known method can be adopted. For example, when the handle body of the razor handle contains a P3HA-based resin, the razor handle according to this embodiment can be manufactured by the injection molding technique disclosed in, for example, International Publication No. 2022 / 209602.

[0043] Also, in the razor according to the present embodiment, when the razor head is made of resin, similarly to the razor handle, the razor head preferably contains a biodegradable resin as a base material. Further, the biodegradable resin is preferably a polyhydroxyalkanoic acid-based resin, and particularly preferably a poly(3-hydroxyalkanoate)-based resin.

[0044] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0045] That is, one embodiment of the present invention is as follows.

[0046] <1>A razor handle 10 having a gripping portion 1 and a mounting portion 2 for mounting a razor head H, the mounting portion 2 including a handle body 11 connected to one end (the end on the LDa side) in the longitudinal direction (LD direction) of the gripping portion 1, the gripping portion 1 having a space portion S that is open on a first side (HDb side) in the height direction (HD direction) and extends in the longitudinal direction (LD direction), the space portion S having a top wall portion 1a disposed on a second side (HDa side) opposite to the first side (HDb side) in the height direction (HD direction) and two side wall portions 1b and 1c connected to the top wall portion 1a, and the top wall portion 1a being thicker than the side wall portions 1b and 1c over the longitudinal direction (LD direction).

[0047] <2>The cross-sectional shape of the gripping portion 1 perpendicular to the longitudinal direction (LD direction) is an inverted U shape when the top wall portion 1a is on the upper side, the razor handle 10 of <1>.

[0048] <3>The handle body 11 is an injection molded body, the gripping portion 1 has a gate trace G during injection molding, and in the gripping portion 1, the gate trace G is at the other end (the LDb side end) opposite to one end (the LDa side end) in the longitudinal direction (LD direction) connected to the mounting portion 2, the razor handle 10 of <1> or <2>.

[0049] <4>The top wall portion 1a of the razor handle 10 according to any one of <1> to <3> is thickened 1.2 to 5.0 times compared to the side wall portions 1b and 1c.

[0050] <5>The handle body 11 of the razor handle 10 according to any one of <1> to <4> contains a biodegradable resin as a base resin.

[0051] <6>The biodegradable resin of the razor handle 10 according to <5> is a polyhydroxyalkanoic acid - based resin.

[0052] <7>The polyhydroxyalkanoic acid - based resin of the razor handle 10 according to <6> is a poly(3 - hydroxyalkanoate) - based resin.

[0053] <8>A razor comprising the razor handle 10 according to any one of <1> to <7> and a razor head H.

Explanation of Reference Numerals

[0054] 1 Gripping portion 1a Top wall portion 1b, 1c Side wall portions 2 Mounting portion 10 Razor handle 11 Handle body H Razor head

Claims

1. a gripping portion, and a mounting portion for mounting a razor head, wherein the mounting portion includes a handle body connected to one end in the longitudinal direction of the gripping portion, the gripping portion includes a space portion that is open on a first side in the height direction and extends in the longitudinal direction, the space portion has a top wall portion disposed on a second side opposite to the first side in the height direction and two side wall portions connected to the top wall portion, a razor handle, wherein the top wall portion is thicker than the side wall portions over the longitudinal direction.

2. When the top wall portion is on the upper side, the cross-sectional shape of the gripping portion perpendicular to the longitudinal direction is an inverted U shape. The razor handle according to claim 1.

3. the handle body is an injection molded body, the gripping portion has a gate trace during injection molding, in the gripping portion, the gate trace is at the other end opposite to one end in the longitudinal direction connected to the mounting portion. The razor handle according to claim 1.

4. the top wall portion is 1.2 to 5.0 times thicker than the side wall portions. The razor handle according to claim 1.

5. the handle body includes a biodegradable resin as a base resin. The razor handle according to claim 1.

6. the biodegradable resin is a polyhydroxyalkanoate-based resin. The razor handle according to claim 5.

7. the polyhydroxyalkanoate-based resin is a poly(3-hydroxyalkanoate)-based resin. The razor handle according to claim 6.

8. a razor comprising the razor handle according to any one of claims 1 to 7 and a razor head.

Images