JP6857049B2 - Bathing agent - Google Patents

Description

The present invention relates to an improvement of a bathing agent obtained by compression molding a raw material containing powder as a main component.

The applicant has previously proposed a bathing agent having a recess in the center on the surface side as a bathing agent having excellent solubility, being hard to break, and being easy to manufacture (see Patent Document 1). When this bathing agent is put into bath water, a through hole is formed at the bottom of the recess during dissolution. As a result, dissolution occurs not only from the outer peripheral surface of the bathing agent but also from the wall surface of the through hole, so that excellent solubility is exhibited. Further, since the through hole is not formed in the state before melting, it is structurally hard to break.

Apart from the above-mentioned bathing agent, the applicant requested that the top surface and the bottom surface be a pair of first sides parallel to each other and a pair of second sides having a positional relationship of 90 degrees with respect to them and parallel to each other. A bathing agent having a polygonal shape having two or more sets of four sides consisting of two or more and all internal angles of less than 180 degrees has also been proposed (see Patent Document 2). This bathing agent has an advantage that defects such as cracks and chips are unlikely to occur even if they collide with each other during transportation of the production line or during transportation of the product.

Japanese Unexamined Patent Publication No. 8-333236 JP-A-2010-275257

All of the above bathing agents are obtained by compression molding a raw material containing powder as a main component, but capping may occur when the speed of compression molding is increased in order to improve productivity. Capping is a phenomenon in which residual stress and density are distributed inside the molded product during compression, and a part of the molded product is peeled up and down when released from compression. Patent Documents 1 and 2 do not solve the production problem that capping is likely to occur when compression molding is performed at high speed.

An object of the present invention is to provide a bathing agent made of a powdered compression molded product, which can eliminate the above-mentioned drawbacks of the prior art.

The present invention is a solid bathing agent obtained by compression molding a raw material containing powder as a main component.
A small recess having a top surface, a bottom surface, and a side surface, the top surface having an inverted cone-shaped recess, and an inclined surface from the central portion to the outer peripheral portion of the recess, the surface of the recess is further recessed. It provides a bathing agent that is partially possessed.
Further, the present invention is a method for producing a bath agent, which is produced by compression molding a raw material containing a powder as a main component, wherein the surface for pressurizing the top surface is convex corresponding to the concave portion. The present invention provides a method for producing a bathing agent, which comprises a step of compression molding the raw material by using a pressure member having a portion and a small convex portion corresponding to the small concave portion.

According to the present invention, there is provided a bathing agent composed of a powdered compression-molded product which can be compression-molded at high speed and has sufficiently high solubility when put into bath water.

FIG. 1 is a perspective view showing a bathing agent according to the first embodiment of the present invention. FIG. 2A is a plan view of the bathing agent shown in FIG. 1 as viewed from the top surface side thereof, FIG. 2B is a side view of the bathing agent, and FIG. 2C is II of the bathing agent. It is a −II line enlarged sectional view. FIG. 3 is a bottom view of the bathing agent shown in FIG. FIG. 4 is a view corresponding to FIG. 2A showing another example of the small recess formed in the recess. 5 (a) to 5 (d) are process diagrams showing a preferred embodiment of the method for producing a bathing agent of the present invention. FIG. 6 is a perspective view showing a bathing agent according to a second embodiment of the present invention. 7 (a) is a plan view of the bath agent shown in FIG. 6 as viewed from the top surface side, FIG. 7 (b) is a side view of the bath agent, and FIG. 7 (c) is VII of the bath agent. -VII is an enlarged cross-sectional view taken along the line. FIG. 8 is a diagram showing a more preferable specific form of the upper punch (pressurizing member).

Hereinafter, the present invention will be described based on the preferred embodiment with reference to the drawings.
FIG. 1 shows an embodiment of the bathing agent of the present invention. The bathing agent of the present invention is a compression molded product obtained by compression molding a raw material containing powder as a main component. The bathing agent dissolves and disperses when it is put into bath water, and exerts a desired effect and efficacy.

As shown in FIGS. 1 to 3, the bath agent 1 of the first embodiment has a top surface 2, a bottom surface 3, and a side surface 4. The bath agent 1 of the first embodiment has a flat columnar shape. The bathing agent 1 has, for example, a substantially square shape having a side length L of preferably 40 to 50 mm or a circular shape having a diameter of 40 to 50 mm and a thickness T of 5 to 20 mm. It should be noted that FIGS. 2 (a) to 2 (c) are collectively referred to as FIG. 2, and FIGS. 7 (a) to 7 (c) are collectively referred to as FIG. 7.
The bathing agent 1 of the present invention has a thickness T of preferably 2/3 or less, more preferably 1/10 or more and 1 / of the maximum length Lm [see FIG. 2 (a)] of the bathing agent 1 in a plan view. It is 2 or less. The maximum length Lm of the bathing agent 1 in a plan view refers to the length of the longest straight line having both ends on the outer edge of the bathing agent in the plan view of the bathing agent viewed from the top surface side having the recess 21. ..

As shown in FIGS. 1, 2 (a) and 2 (c), the bath agent 1 of the first embodiment has an inverted cone-shaped recess 21 on the top surface 2. The recess 21 has a central portion 22 in a plan view and an inclined surface 23 surrounding the central portion 22 thereof. As shown in FIG. 2C, the central portion 22 of the concave portion 21 has a convex curved surface shape that is convex toward the bottom surface 3 side. The concave portion 21 of the bathing agent 1 has an outer peripheral portion 24 at a position separated from the side surface 4 toward the central portion 22 side in a plan view of the bathing agent 1, and the inclined surface 23 extends from the central portion 22 to the outer peripheral portion 24. There is. The maximum length of the recess 21 in a plan view (not shown) is preferably 70% or more, more preferably 80% or more, and preferably 95 of the maximum length Lm in a plan view of the bathing agent 1 described above. % Or less, more preferably 90% or less, preferably 70% or more and 95% or less, and more preferably 80% or more and 90% or less. The maximum length of the recess 21 in a plan view refers to the length of the longest straight line having both ends on the outer peripheral portion 24 of the recess in the plan view of the bathing agent viewed from the top surface side having the recess 21.

As shown in FIGS. 1, 2 (a) and 2 (c), the recess 21 of the bathing agent 1 partially has a small recess 25 whose surface is further recessed on the inclined surface 23.
Since the recess 21 of the bath agent 1 has the small recess 25, it is possible to effectively suppress the occurrence of capping in the bath agent 1 during the production of the bath agent 1, preferably when the bath agent 1 is produced by the locking device. can do.
As shown in FIGS. 1, 2 (a) and 2 (c), the bathing agent 1 has an inclination of the outer peripheral portion on the top surface side that descends toward the side surface 4 outward from the outer peripheral portion 24 of the recess on the top surface 2. It has a surface 26, and has a bottom surface side outer peripheral inclined surface 31 that rises from the flat surface 32 on the bottom surface 3 toward the side surface 4. The flat surface 32 is a flat surface orthogonal to the thickness direction of the bathing agent 1.

From the viewpoint of preventing the occurrence of capping, the small recess 25 in the bathing agent 1 has a long shape extending from the central portion 22 of the recess 21 toward the outer peripheral portion 24, as shown in FIG. 2 (a). It is preferable that a plurality of small recesses 25 having a long shape are formed in the circumferential direction so as to surround the central portion 22. As shown in FIG. 2A, the long shape extending from the central portion 22 to the outer peripheral portion 24 of the recess 21 extends in a curved shape such as an arc in a plan view, and is also shown in FIG. As such, those extending linearly from the central portion 22 toward the outer peripheral portion 24 are also included. The small recess 25 shown in FIG. 4 is formed on an inclined surface 23 surrounding the central portion 22, and is formed radially from the central portion 22 of the recess 21 toward the outer peripheral portion 24.

The length of the small recess 25 is preferably 20% or more, more preferably 25% or more, and preferably 200% or less, more than the maximum length Lm [see FIG. 2 (a)] of the bathing agent 1 in a plan view. It is preferably 150% or less, preferably 20% or more and 200% or less, and more preferably 25% or more and 150% or less.
Further, the length of the small recess 25 is preferably 2 times or more, more preferably 3 times or more, and preferably 20 times or less, more preferably 15 times or less the width in the center in the longitudinal direction. Further, it is preferably 2 times or more and 20 times or less, and more preferably 3 times or more and 15 times or less.
When the small recess 25 has an arc shape or the like, the length of the small recess 25 is the length of the longitudinal center line 25c that divides the width into two equal parts at each portion in the longitudinal direction, as shown in FIG. 2 (a). Is.

A plurality of small recesses 25 shown in FIGS. 2A and 4 are formed at regular intervals in the circumferential direction of the inclined surface 23 surrounding the central portion 22. From the viewpoint of preventing the occurrence of capping, it is preferable that a plurality of small recesses 25 are formed at intervals in the circumferential direction of the inclined surface 23 surrounding the central portion 22.
The number of small recesses 25 provided in the recess 21 is preferably 2 or more, more preferably 3 or more, further preferably 4 or more, and preferably 15 or less, more preferably 10 or less, still more preferably 8 or less. It is preferably 2 or more and 15 or less, more preferably 3 or more and 10 or less, and further preferably 4 or more and 8 or less.

The bathing agent of the present invention may be compression-molded by any method as long as it is obtained by compression-molding a raw material containing powder as a main component. Preferably, it is in the form of a compression molded product, for example, a tablet, by tableting. As the locking method, a known locking machine, for example, a single-shot locking machine, a rotary type locking machine, a laminated locking machine, a rotary type nucleated locking machine, or the like can be used. By appropriately controlling the conditions at the time of compression molding, a desired bathing agent can be obtained.

As the powder used as a raw material for the bathing agent of the present invention, an appropriate powder is selected according to the specific use of the bathing agent. For example, when the bathing agent is a foaming type bathing agent that generates gas such as carbon dioxide in bath water, a carbonate and a solid acid, particularly an organic acid, can be used as the powder. Examples of the carbonate include sodium carbonate, sodium hydrogen carbonate, magnesium carbonate, potassium carbonate, calcium carbonate and the like. Examples of solid organic acids include succinic acid, fumaric acid, malic acid, adipic acid, tartaric acid, benzoic acid, citric acid, pyrrolidone carboxylic acid, salicylic acid and the like. In addition, these carbonates and solid acids can be used alone or in combination of two or more selected from each.
The blending amount of the carbonate and the solid acid in the bathing agent of the present invention is not particularly limited, but the pH of the bath water is 4 to 7 (0.01% by mass) by appropriately selecting the blending ratio of the solid acid and the carbonate. If it becomes an aqueous solution), the proportion of free carbon dioxide in the bath water increases, so that an excellent blood circulation promoting effect can be obtained. A more preferable acid content is 10 to 80% by mass, particularly preferably 15 to 50% by mass in the bathing agent of the present invention. The content of the carbonate is more preferably 5 to 80% by mass, particularly preferably 10 to 50% by mass in the bath preparation of the present invention.

Further, the bathing agent may contain an oily component. The type of oily component is not particularly limited, but it is added to the bathing agent for the purpose of improving the warmth and skin feel after bathing. Examples of such oily components include fatty acid esters; glycerides; hydrocarbon oils; higher fatty acids; higher alcohols; essential oils; silicone oils and the like, and these can be used alone or in combination of two or more. Above all, if it is an oily component that is liquid at room temperature (25 ° C.), the bonding force between the powders tends to be further reduced. Therefore, it is preferable that the bathing agent has the above-mentioned shape. In particular, when the ratio of the oily component in the bathing agent is within the above-mentioned range, it is preferable that the bathing agent has the above-mentioned shape and defects such as cracks and chips are less likely to occur in the bathing agent.

Further, the bathing agent may further contain a surfactant. Surfactants are added to bathing agents for the purpose of satisfactorily dispersing oily components in bath water. As the surfactant to be used, a nonionic surfactant is preferable, and one or a combination of two or more of these may be blended, and in particular, it is selected from polyoxyethylene alkyl ether and polyoxyethylene alkenyl ether. It is preferable to combine one or more nonionic surfactants, which are selected from polyoxyethylene sorbit tetraoleate and polyoxyethylene sorbitan fatty acid ester, with one or more nonionic surfactants. The content of the surfactant in the bath composition of the present invention is total from the viewpoint of the dispersibility of the oily component in the bath water and the feel of the skin from the viewpoint of preventing defects such as cracks and chips from occurring in the bath. It is preferably 0.01 to 20% by mass, particularly 0.1 to 10% by mass.

The bathing agent may further contain a polymer binder. The polymer binder has an action of binding the particles of the powder to each other when the bathing agent is produced by compression molding using the powder as a raw material. Considering that the bathing agent dissolves in bath water, the polymer binder is preferably water-soluble. Examples of such a polymer binder include dextrin and polyethylene glycol, and in particular, polyethylene glycol having a molecular weight of 1000 to 20000, preferably a molecular weight of 4000 to 10000 can be used. The polymer binder may be used alone or in combination of two or more.
The polymer binder content of the bathing agent is preferably 1% by mass or more and 25% by mass or less, more preferably 2% by mass or more and 20% by mass or less, from the viewpoint of preventing defects such as cracks and chips from occurring in the bathing agent. Particularly preferably, it is 2.5% by mass or more and 15% by mass or less.

The bath agent of the present invention includes known bath agent raw materials, such as inorganic salts, crude drugs, lower alcohols, bactericidal preservatives, and moisturizers, which are usually blended in the bath agent, as long as they do not affect the effect of the present invention. Agents, metal sequestering agents, fragrances, pigments, and other ingredients necessary for formulation can be blended.

Next, a preferred embodiment of the method for producing a bath agent of the present invention will be described with reference to FIG. 5, taking as an example the case of producing the bath agent 1 of the first embodiment using a locking device.
The locking device 5 has a set of molding dies including a rod-shaped upper punch 51 and a lower punch 52, and a tubular mortar 53. The upper punch 51 has a top surface molded surface 51a having a concave-convex shape complementary to the top surface 2 of the bathing agent 1. The lower punch 52 has a substantially flat bottom surface molded surface 52a corresponding to the bottom surface 3 of the bathing agent 1. The mortar hole of the mortar 53 has an inner surface shape corresponding to the side surface 4 of the bathing agent 1. The upper punch 51, lower punch 52, and mortar 53 that make up the molding die are made of ordinary materials such as metal and ceramics that have been conventionally used in this type of locking device.

The upper punch 51 and the lower punch 52 have the same cross-sectional shape as the cross-sectional shape of the mortar of the mortar 53, and can penetrate into the mortar. The upper punch 51 and the lower punch 52 are installed at positions where their axes coincide with the center of the mortar. The upper punch 51 and the lower punch 52 are slidable in the vertical direction along the axis thereof. As a result, the upper punch 51 and the lower punch 52 can be inserted into the mortar hole of the mortar 53. The sliding of the upper punch 51 and the lower punch 52 can be performed by a known means, for example, a hydraulic device or an elevating cam (not shown).

A method for producing the bathing agent 1 using the locking device 5 having the above configuration will be described. First, as shown in FIG. 5A, the tip of the lower punch 52 is the mortar hole of the mortar 53 by an elevating mechanism (not shown). It is inserted inside. As a result, the powder filling portion 55 is formed between the mortar hole and the bottom forming surface 52a of the lower punch 52. On the other hand, the upper punch 51 is raised and evacuated by an elevating mechanism (not shown).

Next, as shown in FIG. 5B, the powder raw material F is supplied from the powder supply device (not shown) and filled in the powder filling section. Subsequently, the lower punch 52 is slightly raised by an elevating mechanism (not shown). As the lower punch 52 rises, a part of the powder raw material F filled in the powder filling portion overflows from the powder filling portion. The overflowing powder raw material is removed by a sliding plate (not shown). As a result, the inside of the powder filling portion is fully filled with the powder raw material F.

Next, as shown in FIG. 5C, the lower punch 52 is kept in the same position, the upper punch 51 is started to descend, and the tip of the punch is inserted into the powder filling portion. With the tips of both pestle inserted in the powder filling part, by sliding both pestle in a direction approaching each other, the powder raw material F filled in the powder filling part becomes the top forming surface of the upper pestle 51. It is compressed between the 51a and the bottom surface forming surface 52a of the lower punch 52.

Considering the physical properties of the tablet such as porosity, moldability, hardness and disintegration of the tablet, the tableting pressure is preferably 4 MPa or more and 70 MPa or less, particularly 9 MPa or more and 50 MPa or less. The tableting force is a value obtained by converting the pressure per unit area of the punch (per unit cross-sectional area in the axial direction of the powder filling space of the punch) from the pressure of the tableting machine. Further, the tableting is preferably performed at a temperature that does not adversely affect the powder raw material, for example, room temperature (20 to 30 ° C.).

When the desired tablet is obtained by applying a compressive force to the powder raw material for a predetermined time, as shown in FIG. 5 (d), the upper punch 51 is raised, taken out from the powder filling portion, and evacuated upward.
Further, the lower punch 52 is also raised at the same time as or slightly after the upper punch 51 is raised. The lower punch 52 rises to a position where its upper end surface is flush with the upper surface of the mortar 53. This makes it possible to move the bathing agent 1 obtained by compression molding to the side and take it out. After taking out the bathing agent 1, the lower punch 52 descends and returns to the position where the powder filling portion is formed together with the mortar 53.
By repeating these steps, a large number of bathing agents 1 are sequentially produced at high speed.

Like the bathing agent 1 of the first embodiment, the bathing agent of the present invention has a small recess 25 in a concave portion 21 formed on the top surface in a specific manner, and therefore, at the time of manufacturing the bathing agent, for example, the above. Even when the bathing agent is produced at high speed using the tableting device as described above, capping, which is a phenomenon in which the bathing agent 1 is peeled off in layers in the vertical direction, is unlikely to occur. The reason is that when the convex portion 54 for forming the concave portion 21 formed in the upper punch 51 has the small convex portion 54a (see FIG. 9) corresponding to the small concave portion 25, the powder raw material F is compressed. By compressing the powder raw material while moving in various directions, it becomes difficult for air to remain in the compressed powder raw material F, and the density difference generated in the bathing agent 1 due to the formation of the recess 21 is small. It is presumed that it is alleviated by forming a recess.

The compression of the powder raw material may be performed in two stages, a precompression performed at a relatively low pressure and a main compression performed at a pressure higher than the precompression, or may be performed in one stage. Since the bathing agent of the present invention has small recesses in the recesses, capping is unlikely to occur even when locking is performed at high speed. Therefore, capping is unlikely to occur even when compression is performed in multiple steps or in one step. .. Pre-compression is sufficient if the air inherent in the powder raw material can be sufficiently evacuated. That is, no further extra compression, for example compression such that the binder in the raw material is deformed for bonding, is required. The compressive force (tablet pressure) at the time of tableting can be appropriately set within an allowable pressure range according to the physical properties of the tablet such as tablet thickness, diameter, tablet hardness, and disintegration time.

From the viewpoint of preventing the occurrence of capping, as shown in FIG. 2A, a plurality of arcuate small recesses 25 in a plan view are formed in the recesses 21 of the bathing agent 1 so as to form a spiral shape as a whole. Is preferable.
From the same viewpoint, the small recess 25 is formed when the virtual straight line P connecting the center point 21c of the recess 21 and the side surface 4 of the bathing agent is rotated 360 ° in the circumferential direction of the recess 21 about the center point 21c. In addition, it is preferable that the virtual straight line is formed so as to intersect with one or more small recesses 25 over the entire circumference of 360 °. Further, from the same viewpoint, as shown in FIG. 2A, the small recess 25 has a virtual straight line P connecting the center point 21c of the recess 21 and the side surface 4 of the bathing agent with the center point 21c as the center. It is more preferable that the virtual straight line is formed so as to intersect with two or more small recesses 25 over the entire circumference of 360 ° when rotated by 360 ° in the circumferential direction of the recess 21.

From the same viewpoint, as shown in FIG. 2A, the width of the small recess 25 gradually increases from the end 25a on the far side from the central portion 22 of the recess 21 toward the end 25b on the near side. In addition, the depth of the small recess 25 from the adjacent portion in the width direction increases from the end portion 25a on the side far from the central portion 22 of the recess 21 toward the end portion 25b on the near side. It is preferable to have.
The maximum depth of the small recess 25 in the direction perpendicular to the inclined surface 23 of the recess 21 is preferably 0.3 mm or more, more preferably 0.5 mm or more, and the depth of the small recess 25 is the recess 21. Depth d is preferably 3% or more, more preferably 5% or more, preferably 50% or less, more preferably 35% or less, and preferably 3% or more and 50% or less, more preferably. It is 5% or more and 35% or less.

From the viewpoint of improving the solubility of the bathing agent and preventing the occurrence of capping, the depth d of the recess 21 is preferably 40% or more, more preferably 50% or more, and more preferably 50% or more of the thickness T of the bathing agent 1. Is 90% or less, more preferably 80% or less, and preferably 40% or more and 90% or less, more preferably 50% or more and 80% or less.

From the viewpoint of preventing the occurrence of capping, the ratio of the total area of the small recess 25 to the area of the recess 21 including the area of the small recess 25 is preferably 20 when the bathing agent 1 is viewed in a plan view. % Or more, more preferably 30% or more, preferably 60% or less, more preferably 50% or less, and preferably 20% or more and 60% or less, more preferably 30% or more and 50% or less. The areas of the small recesses 25 and the recesses 21 are areas projected onto a plane orthogonal to the thickness direction of the bathing agent, and in the case of the recesses 21 having a plurality of small recesses 25, the total area of the small recesses 25 is a plurality of. It is the total area of the small recesses 25.

^{The density of the bathing agent is 1.2 g / cm 3} or more and 1.7 g / cm ³ or less, especially 1 from the balance between ensuring the structural strength of the bathing agent and the sedimentability and solubility in the bath water. .3g / cm ³ or more 1.6 g / cm ³ or less is preferably. By keeping the density within this range, not only the strength of the bathing agent is maintained, but also the decrease in solubility due to overcompression when the bathing agent is put into the bath water is effectively prevented. At the same time, it is possible to effectively prevent floating on the water surface. The density of the bathing agent is calculated by mass / volume. The volume is calculated by modeling the tablet shape three-dimensionally using a three-dimensional scanner or the like and using three-dimensional CAD software (Solidworks).

When the bathing agent of the present invention is produced by, for example, the locking device 5 as shown in FIG. 5, when a large number of bathing agents are continuously produced, a member that pressurizes the top surface of the bathing agent such as the upper punch 51 is used. Sticking may occur in which the raw material powder gradually adheres. Sticking also causes inconveniences such as a decrease in manufacturing yield and a decrease in product quality such as a decrease in strength.
From the viewpoint of suppressing such sticking, the bath agent 1 produced has an area ratio of the area of the flat surface of the top surface 2 having the recess 21 to the projected area of the top surface (hereinafter, also referred to as the area ratio of the flat surface). , 13% or less, more preferably 5% or less. The smaller the area ratio is, the more preferable it is, and the lower limit is zero.
The flat surface of the top surface 2 is a plane orthogonal to the thickness direction of the bathing agent, and the area of the flat surface of the top surface 2 and the projected area of the top surface 2 for calculating the area ratio of the flat surface are both. , The area projected on a plane orthogonal to the thickness direction of the bathing agent.

The area of the flat surface of the top surface 2 and the area of the recess 21 are calculated by modeling the tablet shape three-dimensionally using a three-dimensional scanner or the like and using three-dimensional CAD software (Solidworks).

6 and 7 are views showing the bath agent 1A of the second embodiment of the present invention. The bath agent 1A of the second embodiment is different from the bath agent 1 of the first embodiment in the shape of the small recess 25 formed in the recess 21 of the top surface 2. As long as there is no contradiction, the above description of the bath agent 1 of the first embodiment is appropriately applied to the bath agent 1A of the second embodiment. In FIGS. 6 and 7, the same reference numerals as those given to the bathing agent 1 of the first embodiment are attached to the same configurations as those of the bathing agent 1 of the first embodiment.

Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above embodiment.
For example, the small recess 25 formed in the recess 21 may be only one band-shaped small recess 25 formed in a spiral shape.
Further, the plan view shape of the bathing agent and the plan view shape of the recess 21 may be a polygonal shape such as a triangular to octagonal shape, a circular shape, an elliptical shape, a heart shape of playing cards, or the like, respectively. The plan view shape of the bathing agent is preferably a polygonal shape with rounded corners. Further, the plan view shape of the bathing agent and the plan view shape of the concave portion are preferably, but not limited to, substantially similar shapes.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the scope of the present invention is not limited to such examples. Unless otherwise specified, "%" means "mass%".

[Example 1]
Using the raw materials having the compositions shown in Table 1, a bathing agent having the shapes shown in FIGS. 1 to 3 was produced by a rotary locking machine [Hata Iron Works Co., Ltd.]. The locker was adjusted so that the mass of each bathing agent was 40 g and the density was 1.52 or 1.55 g / cm ^3. The speed of the lock press was 10 rpm, 15 rpm, and 20 rpm.
The lock speeds of 10 rpm, 15 rpm, and 20 rpm correspond to 0.4 seconds, 0.3 seconds, and 0.2 seconds, respectively, when converted into the compression time of each bathing agent. The compression time of each bathing agent is the time from the start of compression to the time when the upper punch separates from the compression molded product after compression.

[Comparative Example 1]
In Example 1, the bathing agent to be produced was produced in the same manner as in Example 1 except that the bathing agent to be produced had a shape shown in the column of Comparative Example 1 in Table 3 having no small recess in the recess. The speed of the locker was 10 rpm, 15 rpm, or 20 rpm.

[Evaluation]
For each of Example 1 and Comparative Example 1, the degree of occurrence of capping was evaluated by observing the 10 bathing agents produced at each speed of the rotary locking machine according to the following evaluation criteria. The results are shown in Table 2 below.
◯: There was no bathing agent that caused capping.
Δ: Capping occurred in some bathing agents.
X: Capping occurred in all bath preparations.
The numbers in parentheses in Table 2 are the ratio of the number of capped bathing agents out of the 10 bathing agents.

From the results shown in Table 2, in Example 1, capping is less likely to occur even if compression molding is performed at a higher speed than in Comparative Example 1, and a good bath agent that does not cause capping is twice as much as in Comparative Example 1. It can be seen that compression molding can be performed at the speed of.

The bath preparation produced in Example 1 had a side length L of 46.9 mm, a maximum plan length Lm of 51.4 mm, and a thickness of 15.2 mm. The bathing agent having a density of 1.55 g / cm ³ had a density variation σ of 0.049. On the other hand, the bathing agent produced in Comparative Example 1 has a side length L of 46.9 mm, a maximum plan length Lm of 51.4 mm, a thickness of 15.0 mm, and a density of 1.55 g / cm ³ The bathing agent of No. 1 had a density variation σ of 0.087. The variation in density passes through the center point 21c of the concave portion of the bathing agent, divides the distance between both ends into five equal parts on a straight line having both ends on the side surface 4, and from each of the five equal parts, one of the bottom surfaces 3 A cubic measurement sample having a side of 5 mm including a portion was collected, the density of each measurement sample was measured, and the variation in density between the two was calculated. From this result, it is presumed that the improvement of the uniformity of the density distribution also contributed to the suppression of capping.

[Evaluation of anti-sticking property]
In the same manner as in Example 1 and Comparative Example 1, 120,000 bathing agents having the shapes shown in the columns of Example 1 and Comparative Example 1 in Table 3 were formed, and then the raw material adhered to the top surface forming surface of the upper punch. The amount of powder was observed. Further, as Example 2, a bathing agent having a shape near the outer peripheral portion of the concave portion slightly different from that of the bathing agent of Example 1 (see the figure in the column of Example 2 in Table 3) is the same as that of Example 1. 120,000 pieces were formed, and the amount of raw material powder adhering to the top surface forming surface of the upper punch was also observed for the bathing agent.
The results are also shown in Table 3.
From the results shown in Table 3, it is recommended that the "flat surface area ratio" of the top surface having the recesses be 13% or less, particularly 5% or less, for the pressure member such as the upper punch that forms the top surface having the recesses. It is preferable from the viewpoint of suppressing the adhesion of the raw material powder, that is, from the viewpoint of suppressing sticking.

FIG. 8 is a diagram showing a more preferable specific form of the upper punch 51 used for manufacturing the bathing agent 1 of the first embodiment, and the upper punch 51 forms a top surface of the bathing agent having small recesses and recesses. The design of the top surface forming surface is particularly excellent. For example, when the application for design registration of a partial design is changed as a portion for which design registration is to be received for a portion located inside the contour line of the top surface forming surface indicated by reference numeral 91 in the bottom view of FIG. , The design pertaining to the application meets the registration requirements stipulated in the Design Law.

1,1A Bathing agent 2 Top surface 21 Recession 21c Center point of recess 22 Central part 23 Inclined surface 24 Outer circumference 25 Small recess 3 Bottom surface 4 Side surface 5 Locking device 51 Upper punch 51a Top surface molding surface 52 Lower punch 52a Bottom molding surface 53 Mill 54 Convex part corresponding to concave part 54a Small convex part corresponding to small concave part 55 Powder filling part

Claims (6)

A solid bathing agent obtained by compression molding a raw material containing powder as the main component.
Has a top, bottom and sides
The top surface has an inverted cone-shaped recess, and the inclined surface from the central portion to the outer peripheral portion of the recess has a small recess in which the surface of the recess is further recessed .
A bathing agent in which the small recesses are formed in a spiral shape. The bath agent according to claim 1, wherein the small recess has a long shape extending from the central portion of the recess toward the outer peripheral portion, and a plurality of the small recesses are formed in the circumferential direction so as to surround the central portion. The small recess extends over the entire circumference of 360 ° when a virtual straight line connecting the center point of the recess and the side surface of the bathing agent is rotated 360 ° in the circumferential direction of the recess about the center point. The bathing agent according to claim 1 or 2 , wherein the virtual straight line is formed so as to intersect with one or more small recesses. The small recess extends over the entire circumference of 360 ° when a virtual straight line connecting the center point of the recess and the side surface of the bathing agent is rotated 360 ° in the circumferential direction of the recess about the center point. The bathing agent according to claim 3 , wherein the virtual straight line is formed so as to intersect with two or more small recesses. The bathing agent according to any one of claims 1 to 4 , wherein the area ratio of the flat surface of the top surface to the projected area of the top surface is 0% or more and 13% or less. A method for producing a bathing agent, wherein the bathing agent according to any one of claims 1 to 5 is produced by compression molding a raw material containing powder as a main component, and the concave portion is formed on a surface for pressurizing the top surface. A method for producing a bathing agent, comprising a step of compression molding the raw material using a pressure member having a convex portion corresponding to the above and a small convex portion corresponding to the small concave portion.

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