KR102462839B1 - Capsule for preparation of beverage - Google Patents

Abstract

The present invention forms a through hole in the membrane made of aluminum when the extraction fluid is injected into the capsule and integrally forms a plate on the capsule body to perform the function of guiding the liquid extract passing through the through hole of the membrane to the discharge port. Since the capsule body and the plate can be manufactured together with the mold, the mold cost for manufacturing them can be reduced, and when the capsule body is aligned with the automatic aligner and supplied to the automated process line for manufacturing the finished capsule, the automatic aligner Provided is a capsule for preparing a beverage in which capsule bodies can be smoothly supplied by preventing overlapping by being inserted into each other. The beverage capsule of the present invention, when the membrane is pressed against the bottom surface of the capsule body, has a plurality of perforation protrusions for forming passage holes in the membrane, and a plurality of gaps for forming a flow passage by maintaining a gap between the membrane and the bottom surface. Retaining protrusions are arranged in a predetermined pattern so that a liquid extract flow passage is formed by the space between the gap retaining protrusions and the gap, and a plurality of connections positioned around the outlet to communicate the flow passage and the outlet. A hole was formed in the bottom surface.

Description

Capsule for beverage preparation {CAPSULE FOR PREPARATION OF BEVERAGE}

The present invention relates to a capsule for preparing a beverage, and more particularly, for the instant production of a beverage (tea, coffee, herbal tea, milk, chocolate, etc.) to a capsule for preparing a beverage from a bed of concentrated food substance (eg in the form of powder, granules or leaves).

In the field of capsules or pods for coffee or other brewed liquids, a dispenser group suitable for preparing brews by passing hot water under pressure through a capsule containing a bed of food material to be brewed or dissolved. ) are known. Examples of such known capsules are described in US Patent Publication No. 2010-260896, International Patent Publication No. 2015/008309 and US Patent No. 5,221,028.

A common operating principle of these devices is to provide a perforation in the lid that closes the capsule, allowing a flow of hot water to be introduced under pressure by an infuser group. After obtaining brewing of the bed of food material contained within the capsule, the brewed beverage flows out of the capsule and is discharged by means of a device into a cup or final container.

As a prior art of such a capsule for manufacturing a beverage, 'capsule for manufacturing a beverage' of Patent Publication No. 10-2013-0140038 is known.

As shown in FIGS. 1 to 3, in the prior art, injection is performed by placing the capsule 1 in a machine (not shown), the machine including a needle 2, An extraction fluid is pumped under pressure (shown by an arrow) through the needle (2) and injected into the capsule (1).

The capsule 1 includes a capsule body 3 and an upper cover 4, and the cover 4 is fixed to seal the top of the capsule body 3. The cover 4 is made of a material that is impervious to liquids and gases and can be pierced by the needle 2 .

The capsule 1 additionally comprises a chamber 5 containing at least one bed of food substance 6 to be extracted. The chamber 5 includes an upper film 13 for holding the food material bed 6 . The upper film 13 is made of filter paper or non-woven fabric with small holes through which the food material bed 6 cannot pass.

In addition, at the bottom of the chamber 5, a membrane 7 made of perforable aluminum is attached to the edge 8 at the bottom of the capsule 1 to block the chamber 5 from the outside along with the cover 4, and the membrane 7 ) Plate located at the bottom to form a passage hole 7a (see FIG. 3) in the membrane 7 when the extraction fluid is injected so that the liquid extract generated inside the capsule 1 is discharged through the passage hole 7a (10) is installed, and a pyramidal pin (9) protrudes from the upper surface of the plate (10).

Therefore, as shown in FIG. 3, when the membrane 7 is in close contact with the plate 10 due to the increase in internal pressure when the extraction fluid is injected into the capsule 1, the pin 9 is attached to the membrane 7 through the through hole ( 7a), and the liquid extract passing through the passage hole 7a formed in the membrane 7 passes through the passage 10a formed on the lower circumferential surface of the plate 10 in contact with the inner surface of the capsule body 3 Referring to FIG. 2), the prepared liquid beverage can flow through the outlet 11 of the lower portion of the capsule body 3.

However, in the prior art as described above, when the extraction fluid is injected into the capsule 1, the pin 9 for forming the through hole 7a in the membrane 7 made of aluminum and the through hole 7a of the membrane 7 The passage 10a for guiding the liquid extract passing through the outlet 11 is integrally provided with the plate 10, and the plate 10 is manufactured as a separate part and assembled to the capsule body 3. , Since the capsule body 3 and the plate 10 must be manufactured separately, not only does the cost of the mold for manufacturing them increase, but also the number of parts increases, increasing the number of assembly steps during capsule manufacturing, thereby improving assembly quality and productivity There is a problem of lowering the .

In addition, the pin 9 for forming the through hole 7a in the membrane 7 is integrally formed on the upper surface of the plate 10, and the liquid extract passing through the through hole 7a of the membrane 7 is discharged. Since the passages 10a leading to (11) are integrally formed on the lower circumferential surface of the plate 10 to perform separate functions, the shape of the pin 9 and the passage 10a are changed. The mold design for forming the upper and lower outer surfaces of the plate 10 is complicated, which makes it difficult to manufacture molds and increases manufacturing costs.

In addition, the beverage capsule 1 as described above is manufactured through an automated assembly line for mass production, and the food material bed 6 is placed in the capsule body 3 while the capsule body 3 is transported along the assembly line. It automatically assembles the components to produce a finished product.

At this time, the capsule body 3 is manufactured in a separate injection mold and put in a large amount into an automatic aligning device. It is supplied to the next automated process line.

However, since the conventional capsule body 3 is formed in a hollow cylindrical shape and is supplied in large quantities to the automatic aligning device, the capsule bodies 3 are sandwiched and overlapped in the automatic aligning device, and the overlapping capsule bodies 3 Since it is automatically aligned, it is inconvenient for the operator to separate the overlapping capsule bodies 3 each time.

The present invention is to solve the above conventional problems, the purpose of which is to form a through hole in the membrane made of aluminum when the extraction fluid is injected into the capsule, and to guide the liquid extract passing through the through hole of the membrane to the discharge port. By integrally forming the plate to be performed on the capsule body, it is possible to manufacture the capsule body and the plate together with one mold, thereby reducing the cost of the mold for manufacturing them, as well as reducing the number of parts to manufacture the capsule. An object of the present invention is to provide a capsule for manufacturing a beverage capable of improving assembly quality and productivity by simplifying the assembly process.

In addition, another object of the present invention is to prevent capsule bodies from overlapping each other in the automatic alignment device when aligning the capsule bodies with an automatic alignment device and supplying them to an automated process line for manufacturing finished capsules, so that the capsule bodies are smoothly supplied. The object of the present invention is to provide a capsule for preparing a beverage that can eliminate the hassle of separating the overlapping capsule bodies each time by the operator.

In order to achieve the above object, the present invention is a capsule body with an open top and a discharge port for discharging liquid extract at the bottom; a cover fixed to seal an upper end of the capsule body; a chamber installed inside the capsule body to hold a food material bed; and an aluminum membrane fixed to the lower portion of the chamber to seal the lower end of the capsule body.

On the bottom surface of the capsule body, when the membrane is pressurized, a plurality of perforation protrusions for forming passage holes in the membrane and a plurality of gap holding protrusions for forming a flow passage by maintaining a gap between the membrane and the bottom surface are formed in a predetermined pattern. Arranged so that a flow passage of the liquid extract is formed by the space and the gap between the gap holding protrusions,

A beverage capsule is characterized in that a plurality of connection holes are formed on the bottom surface to communicate with the flow passage and the outlet around the outlet.

In addition, in the present invention, the bottom surface is a circular first bottom surface formed around the discharge port and the connection hole is formed, and a circular second bottom surface formed around the first bottom surface. It is made of cotton, and a plurality of gap holding protrusions are formed on the first bottom surface, and a plurality of hole protrusions and gap holding protrusions are formed together on the second bottom surface,

The first bottom surface and the second bottom surface are formed lower than the second bottom surface by a step so that the gap between the first bottom surface and the membrane is larger than the gap between the second bottom surface and the membrane. It is characterized by capsules for making beverages.

In addition, in the present invention, the plurality of gap maintaining protrusions formed on the first bottom surface of the capsule body are arranged in a plurality of circular rows around the plurality of connection holes, and each gap maintaining protrusion is displaced from each other to extract liquid extract. There is a feature of the beverage preparation capsule designed to retard the flow of

In addition, in the present invention, the perforation protrusion is a beverage preparation capsule composed of a perforation extension portion formed to gradually decrease in thickness from the bottom surface upward, and a perforation portion formed successively at the upper end of the perforation extension portion and having a smaller thickness than the perforation extension portion has a characteristic in

In addition, in the present invention, there is a feature of the beverage manufacturing capsule in which a plurality of overlapping pieces are formed on the inner wall surface of the capsule body so that other capsule bodies are not overlapped.

According to the beverage manufacturing capsule of the present invention having the above characteristic configuration, when the extraction fluid is injected into the capsule, a function of forming a through hole in the membrane made of aluminum and inducing the liquid extract passing through the through hole of the membrane to flow to the outlet As the function is performed by the perforation protrusion, gap maintaining protrusion and connection hole integrally formed on the bottom surface of the capsule body, compared to the conventional configuration with a plate composed of separate parts to perform the above two functions Assembly quality and productivity can be improved by simplifying the assembly process when manufacturing capsules by reducing the number of parts, and by simplifying mold design during injection molding by unifying parts, mold manufacturing is easy and cost is reduced.

According to another characteristic configuration of the present invention, when the liquid extract is discharged, the bottom surface of the capsule body forms a larger gap between the membrane and the bottom surface due to a step, so that the first bottom surface closer to the second bottom surface from the discharge port is larger, When the liquid extract introduced into the passage hole of the pressure is guided to the discharge port through the flow passage, there is an effect of preventing the bursting of the capsule due to the pressure rise.

According to another characteristic configuration of the present invention, a plurality of rows of gap maintaining protrusions formed on the first bottom surface of the capsule body are formed, and each gap maintaining protrusion is arranged offset from each other, so that the flow of the liquid extract can be delayed. Thereby, there is an effect of preventing splashing when discharged into a cup or final container by slowing down the discharge rate of the liquid extract discharged through the discharge port.

According to another characteristic configuration of the present invention, the shape of the perforation protrusion forming the passage hole when the membrane is pressed is gradually smaller in thickness, and the perforation extension is formed successively at the upper end of the perforation extension and has a smaller thickness than the perforation extension As the perforation part is formed, the perforation of the membrane and the expansion of the perforation part are continuously performed to reliably form the through hole. As a result, when the through hole is not partially formed, the internal pressure of the capsule body rises and occurs. This can prevent capsule bursting.

According to another characteristic configuration of the present invention, as a plurality of overlapping prevention pieces are formed on the inner wall surface of the capsule body, the capsule body overlaps when the capsule body is aligned with an automatic aligning device and supplied to an automated process line when manufacturing a finished capsule. Since overlapping is prevented by being inserted into each other by the prevention piece, the supply of the capsule bodies is smooth, and the trouble of separating the overlapping capsule bodies from time to time by the operator is eliminated.

1 is a cross-sectional view showing a conventional beverage capsule for manufacturing.
Figure 2 is an exploded perspective view showing the capsule body and the plate in Figure 1;
Figure 3 is an enlarged cross-sectional view of a main part showing a liquid extract discharge state in FIG.
Figure 4 is a cross-sectional view showing a capsule for preparing a beverage according to the present invention.
Figure 5 is a longitudinal cross-sectional perspective view showing the capsule body in the beverage manufacturing capsule according to the present invention.
6 is an enlarged perspective view of a main part of the capsule body in FIG. 5;
Figure 7 is a plan view showing the capsule body in the beverage manufacturing capsule according to the present invention.
8a and 8b are enlarged main parts of FIG. 4, which are operational states of the beverage preparation capsule according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

4 is a cross-sectional view showing a capsule for preparing a beverage according to the present invention. As shown, the capsule 100 for preparing a beverage of the present invention is a synthetic resin with an open top and a cylindrical outlet 111 for discharging liquid extract at the bottom. It has a capsule body 110 made of ash. The body of the capsule body 110 is inclined so that the lower part is slightly narrower than the upper part.

Injection is performed by placing the capsule 100 in a machine (not shown), the machine including a needle 2 (see FIG. 4), through which the extraction fluid is applied under pressure ( It is pumped under (shown by the arrow in FIG. 4) and injected into the capsule body 110.

The capsule 100 includes a cover 120 fixed to seal the top of the capsule body 110, and the cover 120 is made of a material that is impervious to liquids and gases and can be pierced by a needle 2. has been

The capsule 100 has a chamber 140 containing at least one food material bed 130 to be extracted inside the capsule body 110 .

The food material bed 130 is concentrated in predetermined disposable quantities for the instant preparation of beverages (tea, coffee, herbal tea, milk, chocolate, etc.), for example in the form of powder, granules or leaves. is made up of

The chamber 140 is for maintaining the food material bed 130 inside the capsule body 110 and includes an upper film 142. The upper film 142 is made of filter paper or non-woven fabric having small holes through which the food material bed 130 cannot pass.

A membrane 150 is installed below the chamber 140 in the capsule body 110 . The membrane 150 is attached to the edge 110a at the inner lower part of the capsule body 110 to block the chamber 140 from the outside together with the cover 120, and is made of punctureable aluminum material.

Meanwhile, FIGS. 5 to 7 show the capsule body 110 in the capsule 100 of the present invention. As shown, the internal pressure due to the injection of the extraction liquid is applied to the lower bottom surface 112 inside the capsule body 110. When the membrane 150 is pressed upward, a plurality of piercing protrusions 113 for forming through holes 151 (see FIG. 8B) in the membrane 150, and between the membrane 150 and the bottom surface 112 A plurality of gap holding protrusions 114 for maintaining the gaps a1 and a2 are arranged in a predetermined pattern shape, and the liquid extract flows between the gap holding projections 114 and through the gaps a1 and a2. passage is formed.

In addition, on the bottom surface 112 of the capsule body 110, a plurality of connection holes 116 located around the outlet 111 communicate the flow passage formed by the gaps a1 and a2 with the outlet 111. ) is formed.

Therefore, when the extraction fluid is injected, the liquid extract is discharged through the passage hole 151 of the membrane 150 formed by the perforation protrusion 113, and then the gap (a1, a2) between the membrane 150 and the bottom surface 112 It is guided to the flow passage formed due to the configuration so that it is discharged to the outlet 111 through the connection hole 116. At this time, the through hole 151 should be formed to a size that only the liquid extract passes through without passing the food material bed 130 such as coffee.

As described above, the present invention forms a plurality of perforation protrusions 113 and gap retaining protrusions 114 in a predetermined pattern on the inner lower bottom surface 112 of the capsule body 110, so that the membrane 150 The function of forming the passage hole 151 and the function of guiding the liquid extract passing through the passage hole 151 of the membrane 150 to the outlet 111 is integrally formed in the capsule body 110. do.

At this time, the perforation protrusion 113 has a perforation expansion part 113a whose thickness gradually decreases as it goes upward, and a perforation part 113b formed consecutively at the upper end of the perforation extension part 113a and having a smaller thickness than the perforation expansion part 113a. ), and as shown in FIGS. 8A and 8B, when the membrane 150 is pressed, the membrane 150 is perforated and the perforated portion is continuously expanded, thereby reliably forming the through hole 151. be able to

The gap maintaining protrusion 114 is formed with a low height so that there is no difference in thickness between the lower part and the upper part, or is minimized, and the upper surface is formed in a flat shape so that the membrane 150 is not perforated and only adheres to the membrane 150 and the bottom surface 112 ) is to maintain the gaps (a1, a2) forming a flow passage between them.

As shown in FIGS. 6 and 7, the bottom surface 112 of the capsule body 110 includes a circular first bottom surface 112a and a second bottom surface 112b concentrically arranged around the outlet 111. ) are separated. The first bottom surface 112a is formed around the outlet 111 as a center, and a connection hole 116 connected to the outlet 111 is formed. The second bottom surface 112b is formed outside the first bottom surface 112a around the first bottom surface 112a as a center.

A plurality of gap retaining protrusions 114 are formed on the first bottom surface 112a, and a plurality of punching protrusions 113 and gap maintaining protrusions 114 are formed together on the second bottom surface 112b. The bottom surface 112a and the second bottom surface 112b are formed so that the first bottom surface 112a is lower than the second bottom surface 112b by the step 112c, so that the first bottom surface 112a and the membrane 150 ) The gap a1 between the second bottom surface 112b and the membrane 150 is formed to be larger than the gap a2 between the membrane 150 .

Therefore, the liquid extract flows through the passage hole 151 of the membrane 150 perforated by the perforation protrusion 113 of the second bottom surface 112b through the flow passage formed by the gap a2 of the second bottom surface 112b. When it flows into the flow passage formed by the gap a1 of the first bottom surface 112a, the flow passage expands to reduce the pressure in the capsule 100 and the flow pressure of the liquid extract.

In addition, a plurality of gap holding protrusions 114 formed on the first bottom surface 112a are arranged in a plurality of circular rows around the plurality of connection holes 116, and each gap holding protrusion 114 is arranged offset from each other, , flow inclined passages 114a and 114b between the gap holding protrusions 114 are formed in different directions. Therefore, when the liquid extract flows toward the connection hole 116, the flow may be delayed while colliding with the gap retaining protrusion 114.

Referring back to FIGS. 5 and 7 , a plurality of overlap prevention pieces 117 are protruded from the inner wall surface of the capsule body 110 . The plurality of overlapping prevention pieces 117 are disposed in the circumferential direction of the capsule body 110 and protrude toward the center, and the lower portion of another capsule body 110 is inserted through the open upper portion of the capsule body 110 to overlap. that was to prevent it.

Therefore, when a plurality of capsule bodies 110 are aligned with an automatic aligning device and supplied to an automated process line when manufacturing a finished product of the capsule 100, the lower end of another capsule body 110 is inserted into the capsule body 110 to prevent overlapping. Therefore, the function of facilitating the supply of the capsule bodies 110 is performed without the operator having to separate the overlapping capsule bodies 110 one by one.

Referring to the action of the capsule for preparing a beverage according to the present invention composed of such a configuration is as follows.

The capsule 100 is injected by placing it in a machine (not shown), and as shown in FIG. 4, the needle 2 of the machine penetrates the cover 120 so that the extraction fluid is pressurized (FIG. 4 It is pumped under (shown by an arrow in ) and injected into the capsule body 110.

The extraction fluid injected into the capsule body 110 is introduced into the chamber 140 through the upper film 142 of the chamber 140 to produce a liquid extract from the food material bed 130 .

When the internal pressure of the capsule body 110 rises by the injection of the extraction fluid, this pressure exerts a strong pressure on the membrane 150 disposed below the chamber 140 from top to bottom. As shown in FIGS. 8A and 8B , the membrane 150 made of aluminum is subjected to a downward pressure to form a perforation protrusion 113 and a gap retaining protrusion 114 formed on the bottom surface 112 of the capsule body 110. come close to

Thus, in the process of the membrane 150 being in close contact with the perforation protrusion 113, the perforation part 113b perforates the membrane 150 made of aluminum foil, and subsequently the perforation extension part 113a further expands the perforated hole. Since it expands, the through hole 151 can be formed reliably.

In addition, when the membrane 150 is in close contact with the gap maintaining protrusion 114, the membrane 150 is not perforated by the gap maintaining protrusion 114 with a flat upper surface, but only adheres to the gap between the bottom surface 112 and the membrane 150. Gap (a1, a2) is formed in the gap (a1, a2), and a flow passage is formed between the gap holding protrusions (114) by the gap (a1, a2).

Therefore, the liquid extract produced from the food material bed 130 passes through the through hole 151 of the membrane 150 and is discharged from the chamber 140, and the food material bed 130, such as coffee, passes through the through hole 151 It does not pass through and remains in the chamber 140. Subsequently, the discharged liquid extract flows into the flow passage formed by the gaps a1 and a2, and the liquid extract introduced into the flow passage is discharged through the connection hole 116 through the outlet 111 of the capsule body 110.

At this time, the strong pressure acting in the capsule body 110 increases the discharge pressure of the liquid extract discharged through the outlet 111, and when the discharge pressure is large, it may cause the capsule to burst, and also to contain the liquid extract. It is discharged at a high speed into a cup or container, and there is a risk of splashing.

However, in the present invention, the bottom surface 112 of the capsule body 110 has a discharge port 111 rather than the gap a2 of the second bottom surface 112b through which the liquid extract flows through the through hole 151 by the step 112c. Since the gap a1 of the first bottom surface 112a close to ) is larger, the pressure is reduced by the expansion of the flow passage when the liquid extract flows from the second bottom surface 112b to the first bottom surface 112a. As a result, it is possible to prevent the capsule 100 from bursting due to an increase in internal pressure of the capsule 100, and to prevent splashing when the liquid extract is put into a cup or container by slowing down the discharge speed of the liquid extract.

Subsequently, the liquid extract flowing to the first bottom surface 112a is delayed while flowing through the flow passage formed by the gaps a1 between the gap holding protrusions 114 formed in a zigzag shape as shown in FIG. (114) The flow inclined passages 114a and 114b between them are formed in different directions, thereby slowing down the discharge speed of the liquid extract finally discharged through the connection hole 116 to the outlet 111, so that the final It is possible to further prevent the liquid extract contained in the cup or container from splashing out.

As described above, the present invention reliably forms the through hole 151 by the perforation protrusion 113 composed of the perforation extension part 113a and the perforation part 113b, so that the internal pressure increases due to the non-formation of the through hole 151. It is possible to prevent the bursting of the capsule 100 that may occur due to, and the bursting of the capsule is prevented by reducing the internal pressure even in the process of discharging the liquid extract introduced through the through hole 151 to the outlet 111. It is possible to prevent, of course, by slowing down the flow rate of the liquid extract, it is possible to prevent splashing when finally put into a cup or container.

In addition, as the configuration for forming the passage hole 151 in the membrane 150 and the configuration for discharging the liquid extract to the outlet 111 are integrally formed on the bottom surface 112 of the capsule body 110, the number of parts is reduced. In addition, it is possible to simplify the mold design during injection molding of the capsule body 110 by unifying the parts, thereby facilitating the manufacture of the mold.

The embodiments described so far are merely descriptions of preferred embodiments of the present invention, the scope of the present invention is not limited to the described embodiments, and those skilled in the art within the technical spirit and claims of the present invention Various changes, modifications or substitutions will be possible by, and it should be understood that such embodiments fall within the scope of the present invention.

100: capsule 110: capsule body
111: outlet 112: bottom surface
112a, 112b: first and second bottom surfaces 112c: step difference
113: perforation protrusion 113a: perforation extension
113b: perforated part 114: gap retaining protrusion
116: connection hole 117: overlap prevention piece
120: cover 130: food material bed
140: chamber 150: membrane
151: through hole a1, a2: gap

Claims (5)

A capsule body with an open upper end and a lower portion with a discharge port for discharging liquid extract; a cover fixed to seal an upper end of the capsule body; a chamber installed inside the capsule body to hold a food material bed; and an aluminum membrane fixed to the lower portion of the chamber to seal the lower end of the capsule body.
On the bottom surface of the capsule body, when the membrane is pressurized, a plurality of perforation protrusions for forming passage holes in the membrane and a plurality of gap holding protrusions for forming a flow passage by maintaining a gap between the membrane and the bottom surface are formed in a predetermined pattern. Arranged so that a flow passage of the liquid extract is formed by the space and the gap between the gap holding protrusions,
Forming a plurality of connection holes located around the outlet and communicating the flow passage and the outlet on the bottom surface,
The bottom surface of the capsule body is composed of a circular first bottom surface formed around the discharge port and having the connection hole formed therein, and a circular second bottom surface formed around the first bottom surface. ,
A plurality of gap holding protrusions are formed on the first bottom surface, and a plurality of punching protrusions and gap holding protrusions are formed together on the second bottom surface,
The first bottom surface and the second bottom surface are formed lower than the second bottom surface by a step so that the gap between the first bottom surface and the membrane is larger than the gap between the second bottom surface and the membrane. A capsule for preparing a beverage, characterized in that. delete The liquid extract according to claim 1, wherein the plurality of gap maintaining protrusions formed on the first bottom surface of the capsule body are arranged in a plurality of circular rows around the plurality of connecting holes, and each gap maintaining protrusion is arranged offset from each other. A capsule for preparing a beverage, characterized in that it is designed to retard the flow. The method of claim 1, wherein the perforation protrusion is formed of a perforation extension portion gradually decreasing in thickness from the bottom surface upward, and a perforation portion formed continuously at an upper end of the perforation extension portion and having a smaller thickness than the perforation extension portion. Capsules for making beverages. The capsule for preparing a beverage according to claim 1, wherein a plurality of anti-overlapping pieces are formed on the inner wall surface of the capsule body to prevent overlapping with other capsule bodies.

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