JP5590629B2 - Cork stopper manufacturing method and cork stopper manufacturing molding apparatus - Google Patents

Description

The present invention relates to a cork stopper for closing the mouth of a beverage container such as wine, and more specifically, a columnar shape in which a number of cork grains made of cork bark are compression-molded together with a binder resin, and the cork grains are fixed with a binder resin. about the cork its manufacturing method and a molding equipment that.

  As the above-mentioned plug for closing a mouth for a beverage container, a cork stopper has been frequently used because of its excellent sealing property and unique texture. Such a cork stopper is obtained by compressing and molding a kneaded product of a large number of cork grains and a binder resin with a molding machine and heating and curing the binder resin (see, for example, Patent Document 1). The cork stopper for a beverage container is a cylindrical molded body, and as shown in Patent Document 1, the molding is compressed along the longitudinal direction (axial direction) by a molding die. Further, it is extruded into a rod shape by an extruder and cut into an appropriate length. Also in this case, molding is performed in a state where a compressive force is applied along the longitudinal direction. FIG. 7 conceptually shows a front view of the cork stopper thus obtained. A cork stopper 100 shown in FIG. 7 is a cylindrical molded body, and each cork grain 101 is compressed along the longitudinal direction (axis L direction) and fixed by the binder resin 102 in a compressed state. Yes.

JP-A-8-72024

  By the way, in the case of a cork stopper used for a beverage container such as wine, a cork stopper that is flexible in the radial direction and has a large longitudinal strength (tensile strength) is required. This is because if the flexibility in the radial direction is poor, the sealing performance at the container port is deteriorated, and if the strength in the longitudinal direction is low, the container may be broken during bottle opening. As described above, the cork stopper 100 shown in FIG. 7 is compressed along the longitudinal direction and the cork grains 101 are crushed, so that the radial flexibility tends to be poor. It is possible to increase the flexibility in the radial direction by adjusting the molding pressure, etc. However, increasing the flexibility decreases the strength in the longitudinal direction, and this molding method must be balanced in the molding method that compresses along the longitudinal direction. It was difficult.

The present invention has been made in view of the above-described circumstances, and is a method for producing a cork stopper and a molding for manufacturing a cork stopper which is rich in radial flexibility and has strength in the longitudinal direction and which is excellent in sealing performance and plugging ability. It is an object of the present invention to provide the equipment.

  The manufacturing method of the cork stopper according to the first invention comprises kneaded cork grains and a binder resin to form a kneaded product, and a plurality of divided molds placed in a state of being slidably joined to each other on a molding base. After loading the kneaded product into the enclosed ring-shaped molding space and covering the opening of the molding space with a lid, press the plurality of divided molds while making sliding contact with each other on the molding base, The kneaded product is compression-molded into a columnar shape by sliding in a direction to narrow the ring-shaped molding space, and the cork grains are fixed with a binder resin.

  A molding apparatus for manufacturing a cork stopper according to a second invention is a molding apparatus for manufacturing a cork stopper for obtaining a columnar molded body by compression molding a large number of cork grains together with a binder resin, the molding base, A plurality of split molds that are placed on a base so as to be slidable and slidably contacted to form a closed molding space, a lid that covers an opening of the molding space, and the plurality of splits Press the molds in sliding contact with each other, slide in the direction to narrow the ring-shaped molding space loaded with the kneaded product of cork grains and binder resin, and make the split mold to compress the kneaded product into a columnar shape And a pressing operation means for molding.

  In the first and second inventions, the plurality of divided dies may be pressed parallel to a straight line including the center of the molding space.

  In the second invention, the shape of the molding space when the plurality of divided molds are narrowed by sliding may be cylindrical. In this case, the plurality of divided types may include four divided types. Then, the four divided molds are arranged 90 degrees out of phase with each other in a plane direction around the center of the molding space, and the planar shape of the molding space in this arrangement state is the narrowed cylinder. It is good also as what is comprised so that the square shape which has a corner part equivalent to the 1/4 circular arc shape part of a shaping | molding space may be made.

In the cork stopper manufacturing method according to the first invention and the cork stopper manufacturing molding device according to the second invention, the cork stopper manufacturing molding device is surrounded by a plurality of divided molds placed in a state of being slidably connected to each other on the molding base. The kneaded mixture of cork grains and binder resin is loaded into the closed ring-shaped molding space, and the plurality of split molds are pressed while being in sliding contact with each other on the molding base, and are slid in the direction of narrowing the molding space. The kneaded product is compression-molded into a columnar shape under the effect of narrowing the molding space. This split type sliding operation and sliding operation are simply performed by the pressing operation means. In addition, since the opening of the molding space is covered with the lid, the kneaded material loaded in the molding space is divided into molds in a space surrounded by the molding base, the plurality of split molds, and the lid. Are subjected to the mutual sliding contact and the compressive force accompanying the slide. The narrowing action of the molding space acts in the direction orthogonal to the longitudinal direction of the columnar body, that is, in the centripetal direction. Therefore, if the cork grains in the obtained columnar molded body are fixed with a binder resin, a cork stopper having flexibility in the radial direction and having a high strength in the longitudinal direction can be obtained. In addition, the plurality of split molds are placed on the base in a state where they are slidably joined to each other, and are formed by narrowing the ring-shaped molding space formed thereby, so that in the centripetal direction, kneading An object receives only the action of the plurality of divided types without passing through other members. Therefore, molding is performed in a state where the compression in the centripetal direction is homogenized.
The binder resin here includes a thermoplastic resin system, a thermosetting resin system, and an elastomer system, and those suitable for contact with food are desirable.

  In the first and second inventions, if the plurality of split dies are pressed in parallel with a straight line including the center of the molding space, the pressing is performed in an opposing relationship, and the kneaded material by the split dies. The compression action in the centripetal direction is extremely effective, and uniform compression molding in the centripetal direction is more reliably performed.

  In the second invention, if the shape of the molding space when the plurality of divided molds are narrowed by sliding with mutual sliding contact is made cylindrical, the resulting columnar molded body becomes a columnar shape. The compressive force acts evenly in the radial direction of the columnar shape, and suitability as a mouth closing plug for beverage containers such as wine is obtained, and radial flexibility is evenly expressed in the circumferential direction. In this case, if the plurality of split molds are composed of four split molds, the split molds can be easily designed, and the molding space on the split mold base by the pressing operation means is narrowed. The sliding and sliding movements in the direction are smoothly performed. Further, the four divided molds are arranged so as to be shifted by 90 ° from each other in the plane direction around the center of the molding space, and the planar shape of the molding space in this arrangement state is the narrowed cylinder. When it is configured to form a square shape having a corner portion corresponding to a quarter arc shape portion of the shape molding space, a predetermined cylindrical shape is accurately formed when the molding space is narrowed. The

It is a front view which shows notionally the cork stopper of one Embodiment of this invention. It is a longitudinal cross-sectional view of the molding apparatus for manufacturing the cork stopper. It is a longitudinal cross-sectional view of the principal part which shows the point which shape | molds a cork stopper using the molding apparatus. It is a longitudinal cross-sectional view of the principal part which shows the point which takes out the molded object obtained by the molding apparatus. It is a longitudinal cross-sectional view which shows the point which heat-processes the taken out molded object. (A) (b) is a top view of the principal part which shows the state which removed the cover body of the molding apparatus, (a) respond | corresponds to the state of FIG. 2, (b) respond | corresponds to the state of FIG. 3, respectively. . It is a front view which shows the conventional cork stopper notionally.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 shows that a large number of cork grains 1a are compression-molded together with a binder resin 1b, and that the cork grains 1a are fixed with a binder resin 1b. The cylindrical cork stopper 1 is characterized in that it is formed along a direction orthogonal to the longitudinal direction (axis L direction), that is, along the radial direction. In the illustrated cork stopper 1, the peripheral portions at the upper and lower ends are chamfered, but the chamfering is not essential. The cork stopper 1 is fixed in a state in which the cork grains 1a... Are pressure-biased along the axis L direction, as is apparent from comparison with the cork stopper 100 of FIG. It is understood that it has not been realized. This means that the internal stress along the direction of the axis L is smaller than that of the cork stopper 100 of FIG. Moreover, since it is compressed in the direction orthogonal to the axis L direction, it is excellent in flexibility in the radial direction, has good followability to the container mouth of the beverage container, and exhibits excellent sealing performance.

  Next, the shaping | molding apparatus for manufacturing the cork stopper 1 is demonstrated. A molding apparatus 2 shown in FIG. 2 includes a horizontal molding base 21 having a square shape in plan view, and four divided molds 3 that are placed on the molding base 21 so as to be slidable and slidable with each other to form a molding space 30. (Refer to FIGS. 31 to 34 and FIG. 6), the lid 22 that covers the arrangement space of the split mold 3 including the upper opening of the molding space 30 and is closely placed on the upper surface of the split mold 3, and the four splits The molds 31 to 34 are pressed and slid in a direction to narrow the molding space 30 in a state in which the kneaded product 10 (see FIG. 3) of the cork grains and the binder resin is loaded. And a pressing operation means 4 for compressing and molding the cylindrical body into a cylindrical molded body 10A (see FIGS. 3 and 4).

  As shown in FIGS. 6 (a) and 6 (b), parallel guide walls 28 and 29 are erected on the sides of the molding base 21 before and after (the front side and the back side in FIG. 2). Both end portions of the walls 28 and 29 are connected by construction bars 25 and 25. The lid 22 is detachably installed so as to straddle the upper ends of the guide walls 28 and 29. Although not shown in FIG. 2, the lid 22 is positioned on the upper ends of the guide walls 28 and 29 by positioning pins or the like, and is detachably installed and fixed by a locking means. A pair of slide blocks 41, 41 that slide along the guide walls 28, 29 in the air space between the guide walls 28, 29 are placed on the upper surface of the molding base 21. The slide blocks 41, 41 are arranged symmetrically with respect to a center line orthogonal to the guide walls 28, 29 on the molding base 21, and a V-shaped notch portion 41a having an angle of 90 ° is formed on the opposite surface. , 41a. The notches 41a and 41a are configured to form a substantially square (diamond-shaped) air space in a plan view when the slide blocks 41 and 41 are brought into contact with each other as shown in FIG. 6B.

  For example, actuated bodies 42 and 42 formed in a cam shape are fixed to the back portions of the slide blocks 41 and 41. In addition, operation levers 45 and 45 are swingably attached to brackets 43 and 43 fixed to both left and right ends of the molding base 21 via hinge pins 44 and 44, respectively. Actuators 47, 47 as cam follower members are formed at the tips of swing arms 46, 46 integral with the operating levers 45, 45, and are operated by operating the operating levers 45, 45 in the direction of the arrows in FIG. The bodies 47 and 47 are configured to act on the actuated bodies 42 and 42. By causing the operating bodies 47, 47 to act on the operated bodies 42, 42, the slide blocks 41, 41 can be slid on the molding base 21 so as to approach each other. These constitute the pressing operation means 4 for pressing and sliding the four divided molds 31 to 34. As shown in FIG. 6A, the pressing by the pressing operation means 4 includes a straight line including the center of the molding space 30 and along the longitudinal direction of the guide walls 28 and 29 (center line between the guide walls 28 and 29). It is made parallel to L1. Therefore, the slide operations of the slide blocks 41 and 41 are performed in an opposing relationship along the straight line L1. 6B, from the state of FIG. 6A, the pressing operation means 4 is operated, and the four split dies 31 to 34 are pressed and slid along with each other, thereby forming the molding space 30. The state narrowed to a circle is shown. In FIGS. 3, 4, and 6, illustration of the pressing operation means 4 other than the slide block 41 and the actuated body 42 is omitted.

  Each of the four divided dies 31 to 34 is a substantially rectangular parallelepiped block body and is 90 degrees from each other in the plane direction in the air space formed by the notches 41a and 41a of the slide blocks 41 and 41. They are arranged in a state in which the phases are shifted and in a joined state in which they can slide in contact with each other. Split molding surfaces 31a, 32a, 33a, and 34a are formed at one end portion on the inner surface side of each of the split dies 31 to 34 in this arrangement state so that the planar shape forms a quarter arc shape with the same radius of curvature. Moreover, in the said arrangement | positioning state, the square shaping | molding space 30 whose corner part is 1/4 circular arc shape is formed by the four split molds 31-34. 6A, when the pressing operation means 4 is operated and the slide blocks 41 and 41 are slid in the approaching direction, each of the divided molds 31 to 34 has its rear surface (outer surface). ) Is set to slide in the centripetal direction while being in sliding contact with each other on the molding base 21 under the action of the notches 41a and 41a. As a result, when the molding space 30 is narrowed and the slide blocks 41 and 41 are brought into contact with each other as shown in FIG. 6B, the divided molding surfaces 31a, 32a, 33a, and 34a are aligned. The initial molding space 30 is a cylindrical molding space 30A. The radius of curvature of the cylindrical molding space 30A is the same as the radius of curvature of the ¼ arc surface of each divided molding surface 31a, 32a, 33a, 34a.

  A circular hole 21 a is formed at a position corresponding to the narrowed molding space 30 </ b> A on the molding base 21. A lower bush 23 having an inner diameter equal to that of the molding space 30 </ b> A is fitted into the circular hole 21 a, and an inner diameter portion 23 a of the lower bush 23 is a through hole that communicates with the front and back of the molding base 21. A disc-shaped lower sealing member 5 is attached to the inner diameter portion (through hole) 23a so that the through hole 23a is sealed. A mode of sealing the through hole 23a by the lower sealing member 5 will be described later. Further, a circular hole 22a is formed at a position corresponding to the molding space 30A in the lid body 22. An upper bush 24 having an inner diameter equal to that of the molding space 30 </ b> A is fitted into the circular hole 22 a, and the inner diameter portion 24 a of the upper bush 24 is a through hole that communicates with the front and back of the lid 22. A disc-shaped upper sealing member 6 is attached to the inner diameter portion (through hole) 24a so that the through hole 24a is sealed. A mode of sealing the through hole 24a by the upper sealing member 5 will be described later.

  The molding base 21 is supported by four support legs 27, and two suspension bars 26, 26 are suspended on the lower surface of the molding base 21. An intermediate base 70 is supported on the suspension bars 26, 26, and a screw bar 71 that is screwed and screwed in the vertical direction is screwed on the intermediate base 70. A table 7 for receiving and receiving a cylindrical container (hollow container) 8 to be described later is fixed to the upper end of the screw rod 71. The screw rod 71 can be screwed and unscrewed by a rotation operation around the axis of the operation dial 72 fixed to the lower end thereof, whereby the table 7 is moved up and down.

  The upper surface of the table 7 is formed in a dish shape, and the cylindrical container 8 can be placed thereon. The cylindrical container 8 placed on the table 7 is received and stopped by a recess 23b formed on the lower surface of the lower bush 23 when the table 7 is raised as the operation dial 72 is rotated. It is made like that. The inner diameter of the cylindrical container 8 is substantially the same as or slightly larger than the outer diameter of the lower sealing member 5 and the upper sealing member 6, and these sealing members 5, 6 move the inner cylinder portion of the cylindrical container 8 up and down. Sliding contact movement is possible. Further, an inward flange portion 8 a is formed at the lower end portion of the cylindrical container 8, so that the lower sealing member 5 fitted in the cylindrical container 8 is prevented from falling off. Furthermore, two retaining screws 8b penetrating the cylindrical wall are screwed onto the cylindrical wall near the upper end of the cylindrical container 8. The action of the set screw 8b will be described later.

  A push-up rod 80 is inserted through the shaft center portion of the table 7 and the screw rod 71, and the upper portion extends into the inner cylinder portion of the cylindrical container 8 placed on the table 7. An upper end portion 80a of the push-up rod 80 is configured to be fitted into a recess 5a formed at the center of the lower surface of the lower sealing member 5 so as to support the lower sealing member 5 from below. The lower end portion 80b of the push-up rod 80 is held so as not to be dropped by a stopper piece 73 attached to the lower surface of the operation dial 72. In a state where the lower end portion 80b of the push-up rod 80 is held by the stopper piece 73, the lower sealing member 5 supported by the upper end portion 80a is maintained at a position for sealing the through hole 23a. 2 and 3 show that the lower sealing member 5 is maintained in a state of sealing the through hole 23a. The stopper piece 73 is supported by a hinge pin 73a fixed to the lower surface of the operation dial 72 so as to be able to turn horizontally, and a hook portion 73c that can be hooked on a hook pin 73b fixed to the lower surface of the operation dial 72 is provided at the front end portion. Is formed. Therefore, in the state where the hook portion 73c is hooked on the hook pin 73b, the push-up rod 80 can be held so as not to fall, and if this hook is released and the stopper piece 73 is turned horizontally (FIG. 4). (See), the push-up rod 80 is lowered and can be extracted.

  A lower end portion of a plunger 9 that can move up and down is inserted into the inner diameter portion 24a of the upper bush 24. A permanent magnet 9a is attached to the lower end surface of the plunger 9, and a metal upper sealing member is attached to the permanent magnet 9a. 6 is held in an adsorbed state. 2 and 3 show a state in which the plunger 9 is held by a stopper (not shown). In this holding state, the upper sealing member 6 attracted to the permanent magnet 9a seals the through hole 24a. It is assumed that The plunger 9 can be moved up and down by operating means (including manual operation) (not shown). By releasing the stopper, the molded body 10A in the molding space 30A to be described later can be moved to the upper and lower sealing members 6. , 5 and the extrusion means for extruding downward.

  A procedure for molding the molded body 10A of the cork stopper 1 by the molding apparatus 2 having the above-described configuration will be described. First, as shown in FIG. 2, the table 7 is mounted on the lower surface of the lower bush 23 so that the upper end of the cylindrical container 8 stops, and a push-up rod 80 extending into the inner cylinder portion of the cylindrical container 8 is attached. The through hole 23 a of the molding base 21 is sealed with the supported lower sealing member 5. And the kneaded material 10 (refer FIG. 3) of the cork grain and binder resin mix | blended by the predetermined ratio in the shaping | molding space 30 comprised by the initial position relationship of the split molds 31-34 as shown to Fig.6 (a). ) Is loaded. Next, the lid 22 is disposed and fixed so as to straddle the upper ends of the guide walls 28 and 29, and the upper opening of the molding space 30 is covered. The lower end of the plunger 9 is inserted into the upper bush 24, and this insertion state is maintained by a stopper (not shown). The through hole 24a of the lid body 22 is attracted and held by the permanent magnet 9a on the lower end surface of the plunger 9. The upper sealing member 6 is sealed.

  After the preparation is completed, the pressing operation means 4 and 4 are operated to slide the slide blocks 41 and 41 in the direction approaching each other along the straight line L1, and the notch portion associated with the sliding of the slide blocks 41 and 41. By the action of 41a and 41a, the four split dies 31 to 34 are slid in the centripetal direction with mutual sliding contact. The initial molding space 30 is narrowed by the sliding contact and sliding operation of the split molds 31 to 34, and the split molding surfaces 31a, 32a, 33a, and 34a are aligned to form a cylindrical molding space 30A. In the process in which the initial molding space 30 is narrowed to the cylindrical molding space 30A, the kneaded material 10 loaded in the molding space 30 is compressed to obtain a columnar molded body 10A. The compression action by the split molds 31 to 34 is performed along a direction orthogonal to the axial center direction of the columnar molded body 10A. FIG. 3 shows a state in which the kneaded material 10 is compressed into a cylindrical molded body 10A by the action of the split molds 31 to 34. In this state, the cylindrical molded body 10A is sealed in a space formed by the split molding surfaces 31a, 32a, 33a, 34a and the upper and lower sealing members 6, 5.

  After the compression molding, the stopper of the plunger 9 is released, the latching of the stopper part 73 on the hook pin 73b is released, and the stopper part 73 is turned to release the holding of the push-up rod 80. As a result, the push-up rod 80 can be extracted. In this state, the plunger 9 is lowered, and the molded body 10 in the molding space 30A is pushed downward together with the upper and lower sealing members 6 and 5. The upper end of the cylindrical container 8 supported by the table 7 is received and received in the recess 23b of the lower bush 23, and the molded body 10A extruded by the plunger 9 has a cylindrical shape as shown in FIG. It is received in the inner cylinder part of the shape container 8 as it is. The inner diameter portion 24 a of the upper bush 24 and the inner diameter portion 23 a of the lower bush 23 function as a guide cylinder when the plunger 9 is raised and lowered. The lower sealing member 5 descends while sliding on the inner tube portion of the cylindrical container 8 and is locked by the inward flange portion 8a at the lower end portion. Further, the upper sealing member 6 is inserted into the upper end opening of the cylindrical container 8. Accordingly, when the molded body 10A is received in the cylindrical container 8, it is sandwiched between the upper and lower sealing members 6 and 5, so that it does not lose its shape. Then, by rotating the operation dial 72 and lowering the table 7 slightly, the set screws 8b and 8b screwed to the upper end of the cylindrical container 8 are screwed to form the peripheral surface of the upper sealing member 6. The upper sealing member 6 is fixed to the upper end opening of the cylindrical container 8 by engaging the tips of the retaining screws 8b and 8b with the circumferential groove 6a (see FIG. 5).

  When the plunger 9 is raised in a state where the upper sealing member 6 is fixed to the upper end opening of the cylindrical container 8, the upper sealing member 6 is released from the adsorption of the permanent magnet 9a, and the upper end opening is sealed up. The cylindrical container 8 sealed by the member 6 remains on the table 7. The cylindrical container 8 on the table 7 is such that the lower end opening is sealed by the lower sealing member 5 and the upper end opening is sealed by the upper sealing member 6, and the molded body 10A is sealed in the inner cylindrical portion. It is said.

  Further, the operation dial 72 is rotated to lower the table 7, and the cylindrical container 8 is taken out from the table 7 and placed in the oven 11 shown in FIG. In the oven 11, the cylindrical container 8 is heat-treated at a predetermined temperature to cure the binder resin and fix the cork grains. After the heat treatment, the locking screw 8b is loosened, the upper sealing member 6 is removed, and the columnar molded body 10A is taken out from the cylindrical container 8. As described above, since the heat treatment is performed in a state of being enclosed in the cylindrical container 8, the molded body 10A is cured without being out of shape. And the chamfering process is given to the peripheral part of the upper-lower-end part of 10A of molded objects, and the cork stopper 1 as shown in FIG. 1 is obtained. The heating method of the oven 11 here is not particularly limited, but an electromagnetic induction method is desirably employed.

  In addition, although the example of the experimental machine level was shown as the press operation means 4 in the said embodiment, when employ | adopting in an actual manufacturing process, the ball screw system which uses a hydraulic cylinder or a motor as a drive source as the operation main body Etc. are adopted. In addition, the four split molds 31 to 34 are pressed and slid in the centripetal direction with mutual sliding contact from the two opposing directions, but the present invention is not limited to this, and a plurality of split molds slide in the centripetal direction. Other mechanisms may be employed as long as the initial molding space is configured to be narrowed. Furthermore, the holding mechanism of the cylindrical container 8 is not limited to the illustrated example, and other mechanisms can be employed. In addition, although the columnar cork stopper has been described, a prismatic shape may be used.

DESCRIPTION OF SYMBOLS 1 Cork stopper 1a Cork grain 1b Binder resin 10 Kneaded material 10A Molded body 2 Molding device 21 Molding base 22 Lid 3 (31-34) Split mold 30 Molding space 30A Molding space 4 Pressing operation means L1 Straight line

Claims (7)

  Cork grains and binder resin are kneaded to form a kneaded product, and the kneaded product is put into a closed molding space surrounded by a plurality of divided molds placed in a state of being slidably connected to each other on a molding base. After loading and covering the opening of the molding space with a lid, the plurality of split molds are pressed while being in sliding contact with each other on the molding base, and are slid in a direction to narrow the molding space in the closed state. A method for producing a cork stopper, wherein the kneaded product is compression-molded into a columnar shape, and the cork grains are fixed with a binder resin. In the manufacturing method of the cork stopper of Claim 1,
A method of manufacturing a cork stopper, wherein the plurality of divided dies are pressed in parallel to a straight line including the center of the molding space. A cork stopper manufacturing molding apparatus for obtaining a columnar molded body by compression molding a large number of cork grains together with a binder resin,
A molding base, a plurality of divided molds which are placed in a state of being slidably joined to each other and slidable with each other to form a closed molding space, and a lid covering the opening of the molding space And pressing the plurality of split molds while being in sliding contact with each other, and sliding them in a direction to narrow the ring-shaped molding space loaded with a kneaded product of cork grains and binder resin, A molding apparatus for manufacturing a cork stopper, comprising pressing operation means for compressing and molding the kneaded material into a columnar shape. In the molding apparatus for cork stopper production according to claim 3,
The said press operation means presses these division | segmentation type | molds in parallel with the straight line containing the center of the said molding space, The shaping | molding apparatus for cork stopper manufacture characterized by the above-mentioned. In the molding apparatus for cork stopper production according to claim 3 or 4,
A molding apparatus for producing a cork stopper, wherein the shape of the molding space when the plurality of divided molds are narrowed by sliding is cylindrical. In the molding apparatus for cork stopper production according to claim 5,
The molding apparatus for manufacturing a cork stopper, wherein the plurality of divided molds are four divided molds. In the molding device for cork stopper production according to claim 6,
The four divided molds are arranged 90 degrees out of phase with each other in the plane direction around the center of the molding space, and the planar shape of the molding space in this arrangement state is the narrowed cylindrical shape. A molding apparatus for manufacturing a cork stopper, characterized in that the molding apparatus is formed in a square shape having a corner portion corresponding to a quarter arc-shaped portion of the molding space.

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