JP6690892B2 - Tube container manufacturing method and tube container - Google Patents

Description

  The present invention relates to a tube container manufacturing method and a tube container.

BACKGROUND ART Conventionally, a tube container as described in Patent Document 1 below is known. As a tube container of this type, a tubular body portion, a shoulder portion formed separately from the body portion and fixed to an opening end portion of the body portion, and a mouth portion formed integrally with the shoulder portion. And a cap screwed to the mouth.
By the way, as a method of manufacturing a tube container for forming the tube container, the following method using a plurality of mold members made up of a male mold and a female mold is known.
In this method, the male and female dies holding the sleeve to be the body are matched, and the intermediate material supplied between the male and female dies is molded into the shoulder and mouth to form a molded product. There are a forming step of forming, a releasing step of releasing the male mold and the female mold from the molded product, and a screwing step of screwing the cap to the mouth after the releasing step. When the intermediate material is molded into the shoulder portion and the mouth portion in the molding step, the inner surfaces of the shoulder portion and the mouth portion are molded by the male mold, and the outer surfaces of the shoulder portion and the mouth portion are molded by the female mold.

JP, 11-59707, A

  However, in the above-described tube container manufacturing method, in the mold release step, the female mold is divided in the radial direction of the mouth part in order to separate the female mold from the male screw formed on the outer peripheral surface of the mouth part. Since there is no choice but to use a split mold, there is a problem that the efficiency is poor when releasing the female mold.

  The present invention has been made in view of the above circumstances, and an object thereof is to efficiently form a tube container.

In order to solve the above problems, the present invention proposes the following means.
A method for manufacturing a tube container according to the present invention includes a tubular body, a shoulder formed separately from the body and fixed to an opening end of the body, and the shoulder integrally. A method of manufacturing a tube container, comprising: a formed mouth portion; and a cap screwed to the mouth portion, a tube container formed using a plurality of mold members, wherein the plurality of mold members are: A sleeve holding part through which a sleeve to be a body part is inserted, a mouth forming part that stands on the sleeve holding part and forms an inner surface of the mouth part, and connects the sleeve holding part and the mouth forming part to each other. A male mold having a shoulder inner surface molding portion for molding the inner surface of the shoulder portion, a concave shoulder outer surface molding portion for molding the outer surface of the shoulder portion, and a cap housing provided on the bottom surface of the shoulder outer surface molding portion for housing the cap And a female die having a recess, Inserted through the sleeve part accommodating the cap to the cap receiving recess, and between the female and the male, compatibility with a low annular body relative higher the cap relative to the sleeve A molding step of forming a molded product by matching the male mold and the female mold with a certain intermediate material arranged, and a mold releasing step of releasing the male mold and the female mold from the molded product. In the molding step, the intermediate material is softened between the shoulder inner surface molding portion and the shoulder outer surface molding portion and molded into the shoulder portion while being fixed to the opening end portion of the sleeve, It is characterized in that it is flown between the mouth forming portion and the cap to form the mouth portion.

In this case, in the molding process, since the intermediate material is flown between the mouth portion molding portion and the cap to form the mouth portion, in the molded product, the cap is already screwed to the mouth portion and the mouth portion is capped. The male screw at the mouth is not exposed. Therefore, the male mold and the female mold can be separated from the molded product by simply separating the male mold and the female mold from each other. Moreover, as described above, since the cap is already screwed to the mouth of the molded product, it is not necessary to screw the cap to the mouth after the molding step and the mold releasing step. From the above, the tube container can be efficiently formed.
Further, during the molding step, the intermediate material is flown between the mouth molding portion and the cap to mold the mouth, so that the inner surface of the cap and the outer surface of the mouth can be releasably bonded. This can enhance the sealing property of the tube container in the unopened state. Moreover, in the unopened tube container, when the cap is rotated with respect to the mouth portion to separate from the mouth portion, resistance for separating the inner surface of the cap from the outer surface of the mouth portion can be generated. . Therefore, whether or not the tube container is opened can be easily determined based on the presence or absence of resistance when rotating the cap with respect to the mouth portion.

  The intermediate material may be the same material as the sleeve.

  In this case, since the intermediate material is the same material as the sleeve, the shoulder portion can be firmly fixed to the open end portion of the sleeve when the intermediate material is molded into the shoulder portion during the molding process.

  The outer peripheral surface of the mouth-portion molding portion gradually decreases in diameter as it is separated from the sleeve holding portion along the axial direction of the mouth-portion molding portion, and the inner peripheral surface of the cap extends along the axial direction of the cap. The diameter may be gradually reduced as the distance from the opening end of the cap increases.

In this case, the outer peripheral surface of the mouth molding portion gradually reduces in diameter as it is separated from the sleeve holding portion along the axial direction of the mouth molding portion, and the inner peripheral surface of the cap extends along the axial direction of the cap. The diameter gradually decreases as the distance from the open end of the cap increases. Therefore, during the molding process, the intermediate material can be made to flow smoothly between the outer peripheral surface of the mouth molding portion and the inner peripheral surface of the cap, and, for example, the moldability can be improved.
Further, since the inner peripheral surface of the cap is gradually reduced in diameter as it is separated from the opening end of the cap along the axial direction of the cap, it is easy to smoothly remove the cap from the mouth of the opened tube container. It is possible to improve the operability of the tube container.

  A weakening portion is formed at an opening end of the cap and extends over the entire circumference in the circumferential direction of the cap, and the weakening portion includes a plurality of connecting pieces arranged at intervals in the circumferential direction. In the step, when the intermediate material is formed into the mouth portion, the intermediate material may be filled between the connecting pieces adjacent to each other in the circumferential direction to form the filling portion.

In this case, when the intermediate material is formed into the mouth portion, the intermediate material is filled between the connecting pieces adjacent to each other in the circumferential direction to form the filling portion. Therefore, in the unopened tube container, the movement of the connecting piece in the circumferential direction can be regulated by the filling portion when the cap is rotated with respect to the mouth portion so as to be separated from the mouth portion. This makes it possible to break the weakened portion and leave the open end of the cap in the mouth portion, and the remaining portion can function as a pill fur proof ring.
As described above, when the intermediate material is molded into the mouth portion, the pilfer proof ring is formed on the cap simply by filling the intermediate material between the connecting pieces adjacent in the circumferential direction to form the filling portion. be able to. Thereby, even a complicated tube container including a pill fur proof ring can be efficiently formed.

The tube container according to the present invention includes a tubular body, a shoulder formed separately from the body and fixed to an opening end of the body, and integrally formed with the shoulder. A tube container including a mouth portion and a cap screwed to the mouth portion, wherein an inner surface of the cap and an outer surface of the mouth portion are releasably adhered, and the cap is separated from the mouth portion. When the cap is rotated with respect to the mouth portion, the inner surface of the cap and the outer surface of the mouth portion are separated from each other, and the opening end portion of the cap has a weakened portion extending over the entire circumference in the circumferential direction of the cap. Is formed, the weakened portion comprises a plurality of connecting pieces arranged at intervals in the circumferential direction, the filling portion filled in the mouth portion between the adjacent connecting pieces in the circumferential direction. Are integrally formed.
The tube container according to the reference example of the present invention has a tubular body portion, a shoulder portion formed separately from the body portion and fixed to an opening end portion of the body portion, and the shoulder portion integrally. A tube container comprising a formed mouth portion and a cap screwed to the mouth portion, wherein an inner surface of the cap and an outer surface of the mouth portion are releasably adhered, and the cap is the mouth portion. The inner surface of the cap and the outer surface of the mouth portion are separated when rotated relative to the mouth portion to separate from the mouth portion, and the top wall portion of the cap is exposed through the mouth portion to the inside of the body portion. It is characterized by

Tube container, if the formed by the manufacturing method of the tubular container, onto which can be efficiently formed, it is possible to easily determine whether it is opened.

  According to the present invention, a tube container can be formed efficiently.

It is a half cross-sectional view of a tube container formed by the method for manufacturing a tube container according to the first embodiment of the present invention. FIG. 6B is a view for explaining the manufacturing method of the tube container according to the first embodiment of the present invention, which is a half cross-sectional view showing a state before mating the male mold and the female mold. FIG. 6 is a diagram illustrating the method of manufacturing the tube container according to the first embodiment of the present invention, which is a half cross-sectional view showing a state in which a male mold and a female mold are matched. It is a half cross-sectional view of the tube container formed by the manufacturing method of the tube container according to the second embodiment of the present invention. It is a figure explaining the manufacturing method of the tube container which concerns on 2nd Embodiment of this invention, Comprising: It is a half cross-sectional view which shows the state before matching a male mold and a female mold. It is a half cross-sectional view of the tube container formed by the manufacturing method of the tube container according to the third embodiment of the present invention. It is a half cross-sectional view of the cap which comprises the tube container shown in FIG. It is a figure explaining the manufacturing method of the tube container which concerns on 3rd Embodiment of this invention, Comprising: It is a half cross-sectional view which shows the state before matching a male mold and a female mold.

(First embodiment)
Hereinafter, a method for manufacturing a tube container according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3.
First, the tube container 10 formed by the method for manufacturing a tube container according to this embodiment will be described. As shown in FIG. 1, the tube container 10 includes a container body 11 in which contents are stored, and a cap 13 screwed to a mouth 12 of the container body 11.

  Here, the mouth portion 12 and the cap 13 of the container body 11 are formed in a tubular shape, and the central axes of the mouth portion 12 and the cap 13 are located on a common axis. Hereinafter, this common axis is referred to as the container axis O1, the cap 13 side (the mouth side of the container body) is referred to as the upper side along the container axis O1 direction (the axial direction of the cap), and the container body 11 side (the container body seal). Part side) is called the lower side. In a plan view of the tube container 10 when viewed from the container axis O1 direction, a direction orthogonal to the container axis O1 is referred to as a radial direction, and a direction that orbits around the container axis O1 (a direction along the container axis) is a circumferential direction (of the cap). Circumferential direction).

  The tube container 10 includes a body portion 14 and a shoulder portion 15 in addition to the mouth portion 12. The shoulder portion 15 and the mouth portion 12 are integrally formed of the same material, and the body portion 14 is formed separately from the connecting body 16 in which the shoulder portion 15 and the mouth portion 12 are integrally connected. . In this embodiment, the body portion 14 and the connecting body 16 (shoulder portion) are made of the same material (for example, a thermoplastic resin such as polyethylene).

The body portion 14 is formed in a tubular shape. The lower end opening portion (one end opening portion, opening end portion) of the body portion 14 is closed by the seal portion 17, and the connecting body 16 is arranged in the upper end opening portion (other end opening portion, opening end portion) of the body portion 14. It is set up.
The seal portion 17 is formed by sandwiching the lower end opening of the body portion 14 in the radial direction.

  The shoulder portion 15 is fixed to the upper end opening of the body portion 14. The shoulder portion 15 is formed in an annular shape coaxial with the container axis O1 and gradually extends toward the upper side from the outer side toward the inner side in the radial direction. On the outer peripheral edge of the shoulder portion 15, a thin-walled fixing cylinder 18 arranged coaxially with the container axis O1 is provided. The fixing cylinder 18 is inserted into the body portion 14 so as to project downward, and the inner peripheral surface of the upper end opening of the body portion 14 is fixed (bonded) to the outer peripheral surface of the fixing cylinder 18 over the entire circumference. ing.

  The mouth portion 12 is erected on the shoulder portion 15. The mouth portion 12 projects upward from the inner peripheral edge of the shoulder portion 15. A male screw 12a is formed on the outer peripheral surface of the mouth portion 12. A flange portion 19 is provided at the upper end of the mouth portion 12 so as to project inward in the radial direction. The flange portion 19 is arranged coaxially with the container axis O1, and the upper surface of the flange portion 19 facing upward forms the upper end surface of the mouth portion 12.

  A pedestal portion 20 is provided at a portion of the shoulder portion 15 that is adjacent to the mouth portion 12 from the outside in the radial direction. The pedestal portion 20 is formed in an annular shape arranged coaxially with the container axis O1, and projects upward from the shoulder portion 15. The upper end surface of the pedestal portion 20 extends along an orthogonal surface (not shown) orthogonal to the container axis O1.

  The cap 13 is formed in a cylindrical shape with a top. The cap 13 is formed of a material (for example, a thermoplastic resin such as polypropylene) having a low compatibility with the mouth portion 12 (connecting body 16). A female screw 13a corresponding to the male screw 12a of the mouth portion 12 is formed on the inner peripheral surface of the peripheral wall portion of the cap 13.

  The inner surface of the cap 13 is releasably adhered over the entire outer surface of the mouth 12. In this embodiment, the inner peripheral surface of the peripheral wall portion of the cap 13 is releasably adhered to the entire outer peripheral surface of the mouth portion 12, and the lower end surface of the top wall portion of the cap 13 is entirely adhered to the upper end surface of the mouth portion 12. It is adhered so that it can be peeled off. Further, the lower end surface (opening end surface of the cap) of the peripheral wall portion of the cap 13 is releasably adhered to the upper end surface of the pedestal portion 20 over the entire surface.

  The outer peripheral surface of the cap 13 is gradually reduced in diameter from the lower side to the upper side, and is provided with a draft taper for releasing a female mold 26 described later. The outer peripheral surface of the cap 13 is knurled, and a large number of vertical grooves 13b extending in the container axis O1 direction are arranged adjacent to each other over the entire circumference in the circumferential direction. The upper end of the vertical groove 13b reaches the upper end surface of the cap 13 and opens upward. The lower end of the vertical groove 13b is located above the open end surface of the cap 13 and is not open downward.

  An upper recess 21 arranged coaxially with the container axis O1 is formed on the upper end surface of the top wall of the cap 13. The upper recess 21 is recessed downward from the upper end surface. The inner diameter of the upper recess 21 is smaller than the inner diameter of the peripheral wall portion of the cap 13. On the top wall portion of the cap 13, a cylindrical portion 22 arranged coaxially with the container axis O1 is formed at a portion located radially outside the upper recess 21. The wall thickness of the tubular portion 22 along the radial direction is larger than the wall thickness of the peripheral wall portion of the cap 13.

  On the lower end surface of the top wall portion of the cap 13, a lower recess 23 arranged coaxially with the container axis O1 is formed. The lower recess 23 is recessed upward from the lower end surface. The inner diameter of the lower recess 23 is smaller than the inner diameter of the upper recess 21, and is equal to the inner diameter of the flange portion 19. The depth of the lower recess 23 in the container axis O1 direction is smaller than the depth of the upper recess 21 in the container axis O1 direction.

  Next, a plurality of mold members 24 (tube container manufacturing apparatus) used in the tube container manufacturing method according to the present embodiment will be described. In this embodiment, as shown in FIG. 2, a male die 25 and a female die 26 are used as the plurality of die members 24.

  The male mold 25 includes a sleeve holding portion 28 through which the sleeve 27 that will be the body portion 14 is inserted, a mouth portion forming portion 29 that stands on the sleeve holding portion 28 and forms the inner surface of the mouth portion 12, and a sleeve holding portion 28. And a shoulder inner surface forming portion 30 that connects the mouth forming portion 29 and forms the inner surface of the shoulder portion 15. The sleeve holding portion 28 and the mouth forming portion 29 are both formed in a columnar shape, and the central axes of the sleeve holding portion 28 and the mouth forming portion 29 are located on a common axis. Hereinafter, this common axis is referred to as a male axis O2.

  The sleeve holding portion 28 is provided upright on the base portion 31 of the male die 25. A projecting portion 32 for molding the inner surface of the flange portion 19 of the tube container 10 is provided on the projecting end surface of the mouth portion molding portion 29. The shoulder inner surface molding portion 30 is formed in an annular shape coaxial with the male die axis O2, and extends from the sleeve holding portion 28 side toward the shoulder inner surface molding portion 30 side along the male die axis O2 direction (axial direction of the mouth portion molding portion). It is formed in a tapered shape. At a portion where the sleeve holding portion 28 and the shoulder inner surface forming portion 30 are connected, a fixed groove forming portion 38 having a peripheral groove shape for forming the fixing cylinder 18 is provided.

  The female die 26 includes a concave shoulder outer surface molding portion 33 that molds the outer surface of the shoulder portion 15, and a cap housing recess 34 that is provided on the bottom surface of the shoulder outer surface molding portion 33 and that houses the cap 13. The female mold 26 is formed with a cavity 35 that opens to the outside through a cavity opening 35a, and the cavity 35 is provided with the shoulder outer surface molding portion 33 and the cap accommodating recess 34. The central axes of the shoulder outer surface molding portion 33 and the cap accommodating concave portion 34 are located on a common axis. Hereinafter, this common axis is referred to as a female axis O3.

  The shoulder outer surface molding portion 33 is gradually reduced in diameter as it is separated from the cavity opening 35a along the female mold axis O3 direction. The cap accommodating recess 34 accommodates the cap 13 in a state where the inside of the cap 13 is open toward the cavity opening 35a. The depth of the cap housing recess 34 in the female axis O3 direction is larger than the height of the cap 13 along the container axis O1 direction, and the cap housing recess 34 houses the entire cap 13.

  Next, a method of manufacturing the tube container according to this embodiment will be described.

In this manufacturing method, first, as shown in FIG. 2, a preparatory step of inserting the sleeve 27 into the sleeve holding portion 28 and accommodating the cap 13 in the cap accommodating recess 34 is performed. The sleeve 27 is formed in a tubular shape that opens toward both sides in the axial direction.
After that, the male mold 25 and the female mold 26 are supplied with an intermediate material 36 between them to be matched with each other, and a molding step for forming a molded product 37 as shown in FIG. 3 is performed.

  In this forming step, in the present embodiment, first, the male die 25 and the female die 26 are coaxially aligned as shown in FIG. In the illustrated example, the male die 25 is arranged vertically below and the female die 26 is arranged vertically above. When the male die 25 and the female die 26 are matched with each other, it is possible to provide a temperature difference between the male die 25 and the female die 26. For example, the female die 26 is cooled while the male die 25 is kept at room temperature. You may do the same.

  Further, the intermediate member 36 is arranged on the male die 25. In the illustrated example, an annular body that can be placed on the shoulder inner surface forming portion 30 through the mouth portion forming portion 29 of the male die 25 is used as the intermediate material 36, and the intermediate material 36 is placed on the shoulder inner surface forming portion 30. To do. The intermediate material 36 is made of the same material as the sleeve 27 (for example, thermoplastic resin), and the compatibility of the intermediate material 36 is high with respect to the sleeve 27 and low with respect to the cap 13. At this time, the intermediate material 36 is heated to be in a softened state.

  Thereafter, as shown in FIG. 3, the male mold 25 and the female mold 26 are matched with each other, and the intermediate member 36 is fixed to the opening end portion of the sleeve 27 between the shoulder inner surface molding portion 30 and the shoulder outer surface molding portion 33. While being formed into the shoulder portion 15 while being made to flow, it is made to flow into between the mouth portion forming portion 29 and the cap 13 to form into the mouth portion 12. At this time, the protruding portion 32 of the male die 25 is fitted into the lower recess 23, and the open end of the sleeve 27 is fitted into the outer peripheral edge of the shoulder outer surface molding portion 33 of the female die 26, so that the sleeve 27 The fixing cylinder 18 is fixed to the opening end.

Here, since the compatibility of the intermediate material 36 is high with respect to the sleeve 27, when the intermediate material 36 is molded into the shoulder portion 15, the shoulder portion 15 can be firmly fixed to the open end portion of the sleeve 27. On the other hand, since the compatibility of the intermediate material 36 is low with respect to the cap 13, when the intermediate material 36 is molded into the mouth portion 12, it is possible to prevent the mouth portion 12 from being firmly fixed to the cap 13, The outer surface of portion 12 can be releasably adhered to the inner surface of cap 13.
As described above, a molded product 37 in which the shoulder 15 is fixed to the open end of the sleeve 27 and the cap 13 is screwed to the mouth 12 is formed.

After the molding step, a mold releasing step of releasing the male mold 25 and the female mold 26 from the molded product 37 is performed. At this time, the male die 25 and the female die 26 are relatively separated from each other in the axial direction, so that the male die 25 and the female die 26 are released from the molded product 37.
After the releasing step, in the sleeve 27, the contents are supplied into the sleeve 27 from the opening end opposite to the opening end to which the shoulder portion 15 is fixed (supplying step), and thereafter, to this opening end. The body portion 14 is formed by molding the seal portion 17 (sealing step). Thereby, the tube container 10 is formed.

  As described above, according to the method for manufacturing a tube container and the tube container 10 according to the present embodiment, the intermediate material 36 is caused to flow into the space between the mouth forming portion 29 and the cap 13 during the forming process. In the molded product 37, the cap 13 is already screwed to the mouth portion 12 and the mouth portion 12 is covered with the cap 13, so that the male screw 12a of the mouth portion 12 is not exposed. Therefore, the male die 25 and the female die 26 can be released from the molded product 37 by simply separating the male die 25 and the female die 26 from each other. Moreover, as described above, since the cap 13 is already screwed to the mouth portion 12 in the molded product 37, it is not necessary to screw the cap 13 to the mouth portion 12 after the molding process and the mold releasing process. From the above, the tube container 10 can be efficiently formed.

  Further, in the molding step, the intermediate material 36 is flown into between the mouth molding portion 29 and the cap 13 to mold the mouth 12, so that the inner surface of the cap 13 and the outer surface of the mouth 12 are detachably bonded. be able to. Thereby, the sealing property of the tube container 10 in the unopened state as shown in FIG. 1 can be improved. Moreover, in the unopened tube container 10, when the cap 13 is rotated with respect to the mouth 12 in order to separate it from the mouth 12, a resistance for separating the inner surface of the cap 13 and the outer surface of the mouth 12 from each other. Can be generated. Therefore, based on the presence or absence of resistance when rotating the cap 13 with respect to the mouth portion 12, it can be easily determined whether or not the tube container 10 is opened.

  Further, since the intermediate material 36 is the same material as the sleeve 27, when the intermediate material 36 is molded into the shoulder portion 15 in the molding process, the shoulder portion 15 should be firmly fixed to the open end of the sleeve 27. You can

(Second embodiment)
Next, a method of manufacturing a tube container according to the second embodiment of the present invention will be described with reference to FIGS. 4 and 5.
In the second embodiment, the same parts as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and only different points will be described.

  First, the tube container 40 formed by the method for manufacturing a tube container according to this embodiment will be described. As shown in FIG. 4, in the present embodiment, the diameter of the mouth portion 12 gradually decreases from the lower side toward the upper side. The inner peripheral surface of the cap 13 is also gradually reduced in diameter from the lower side to the upper side while being separated from the opening end of the cap 13 along the container axis O1 direction (the axial direction of the cap).

Next, a method of manufacturing the tube container according to this embodiment will be described.
In this manufacturing method, as shown in FIG. 5, as the male mold 25, the outer peripheral surface of the mouth molding portion 29 is separated from the sleeve holding portion 28 along the male mold axis O2 direction (the axial direction of the mouth molding portion). The diameter is gradually reduced in accordance with the above.

  As described above, according to the tube container manufacturing method and the tube container 40 of the present embodiment, as the outer peripheral surface of the mouth molding portion 29 is separated from the sleeve holding portion 28 along the male axis O2 direction. The diameter is gradually reduced, and the inner peripheral surface of the cap 13 is gradually reduced as the inner peripheral surface is separated from the opening end of the cap 13 along the container axis O1 direction. Therefore, during the molding step, the intermediate material 36 can be smoothly introduced between the outer peripheral surface of the mouth molding portion 29 and the inner peripheral surface of the cap 13, and, for example, the moldability can be improved. it can.

  In addition, the inner peripheral surface of the cap 13 gradually decreases in diameter as it separates from the open end of the cap 13 along the direction of the container axis O1, so that the cap 13 is removed from the mouth 12 in the open tube container 40. It becomes possible to smoothly remove the tube container 40, and the operability of the tube container 40 can be improved.

(Third Embodiment)
Next, a method of manufacturing a tube container according to the third embodiment of the present invention will be described with reference to FIGS. 6 to 8.
In the third embodiment, the same components as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and only different points will be described.

  First, a tube container 50 formed by the method for manufacturing a tube container according to this embodiment will be described. As shown in FIGS. 6 and 7, a weakened portion 51 that extends over the entire circumference of the cap 13 in the circumferential direction is formed at the opening end of the cap 13. The weakened portion 51 partitions the cap 13 into a cap main body 52 located above the weakened portion 51 and a pill fur proof ring 53 located below the weakened portion 51. The cap body 52 and the pill fur proof ring 53 can be separated by breaking the weakened portion 51.

  The weakened portion 51 includes a plurality of connecting pieces 54 arranged at intervals in the circumferential direction, and a first gap 55 is provided between the connecting pieces 54 adjacent in the circumferential direction. The connecting piece 54 is formed to be thin in the radial direction, and the outer surface of the weakening portion 51 that faces the outer side in the radial direction is arranged inside the outer peripheral surface of the cap 13 in the radial direction. An annular second gap 56 located between the lower end surface of the cap body 52 and the upper end surface of the pill fur proof ring 53 is provided on the outer side in the radial direction of the weakened portion 51. The second gaps 56 integrally connect a plurality of first gaps 55 that are adjacent to each other in the circumferential direction with the connecting piece 54 interposed therebetween from the outer side in the radial direction.

  Further, in the present embodiment, the connecting portion 16 is provided with the filling portion 57. The filling portion 57 is formed integrally with the mouth portion 12 and fills the entire area of the first gap 55 and the second gap 56. The filling portion 57 includes a first filling portion 58 that fills the first gap 55 and a second filling portion 59 that fills the second gap 56. The first filling portion 58 regulates the movement of the connecting piece 54 in the circumferential direction. The second filling portion 59 integrally connects the plurality of first filling portions 58 and regulates the outward movement of the connecting piece 54 in the radial direction. The second gap 56 and the second filling portion 59 may be omitted.

Next, a method of manufacturing the tube container according to this embodiment will be described.
In this manufacturing method, as shown in FIG. 8, during the molding step, the male die 25 is arranged vertically above and the female die 26 is arranged vertically below to perform axial alignment. In the state where the cap 13 is housed in the cap housing recess 34, the second gap 56 of the cap 13 is closed by the inner peripheral surface of the cap housing recess 34 from the outside in the radial direction. Further, the intermediate member 36 is arranged on the shoulder outer surface molding portion 33 of the female die 26. In the illustrated example, a heated material is provided in an annular shape as the intermediate material 36, and the intermediate material 36 can be directly placed on the female mold 26 from a molding machine of the intermediate material 36, for example.

  Then, in the present embodiment, when the male die 25 and the female die 26 are matched with each other to form the intermediate material 36 in the mouth portion 12 in the molding step, the intermediate material is provided between the connecting pieces 54 adjacent in the circumferential direction. 36 is filled and the filling part 57 is formed. At this time, the intermediate material 36 is spread to the second gap 56 through the first gap 55, and the first filling portion 58 and the second filling portion 59 are formed integrally with the mouth portion 12.

  As described above, according to the tube container manufacturing method and the tube container 50 of the present embodiment, when the intermediate member 36 is molded into the mouth portion 12, the intermediate member is provided between the connecting pieces 54 that are circumferentially adjacent to each other. 36 is filled and the filling part 57 is formed. Therefore, in the unopened tube container 50 as shown in FIG. 6, when the cap 13 is rotated with respect to the mouth portion 12 so as to be separated from the mouth portion 12, the movement of the connecting piece 54 in the circumferential direction is filled. It can be regulated by the portion 57. This makes it possible to break the weakened portion 51 and leave the open end of the cap 13 in the mouth 12, and the remaining portion can function as the pill fur proof ring 53.

  In this way, when the intermediate material 36 is molded into the mouth portion 12, the intermediate material 36 is simply filled between the circumferentially adjacent connecting pieces 54 to mold the filling portion 57, and the pill is formed on the cap 13. The fur proof ring 53 can be formed. Thereby, even a complicated tube container 50 including the pill fur proof ring 53 can be efficiently formed.

  The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  In the molding step, the intermediate material 36 is arranged on the shoulder inner surface molding portion 30 of the male die 25 in the first and second embodiments, and on the shoulder outer surface molding portion 33 of the female die 26 in the third embodiment. However, the present invention is not limited to this. In the first and second embodiments, it is possible to dispose the intermediate member 36 on the shoulder outer surface molding portion 33 of the female die 26, and in the third embodiment, the intermediate material 36 is disposed on the shoulder inner surface of the male die 25. It is also possible to arrange it on the molding unit 30.

  The intermediate material 36 is not limited to the form shown in the above embodiment. For example, it is also possible to apply injection molding in which the intermediate material 36 in a molten state is injected between the male mold 25 and the female mold 26 which are matched with each other in the molding process of the present invention.

In the above embodiment, the intermediate material 36 is made of the same material as the sleeve 27, but the present invention is not limited to this. As the intermediate material 36, a material having a high compatibility with the sleeve 27 and a low compatibility with the cap 13 can be appropriately adopted even if the material is different from that of the sleeve 27.
It is also possible to use a material having a high compatibility as the intermediate material 36 only in the opening end surface of the cap 13. In this case, the resistance generated when opening the unopened tube container 10 can be increased.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with known constituent elements within the scope of the present invention, and it is also possible to appropriately combine the modified examples.

10, 40, 50 Tube container 11 Container body 12 Mouth 13 Cap 14 Body 15 Shoulder 24 Mold member 25 Male 26 Female 27 Sleeve 28 Sleeve holding part 29 Mouth molding part 30 Shoulder inner surface molding part 33 Shoulder outer surface molding Part 34 Cap accommodation recess 36 Intermediate material 37 Molded product 51 Weakened part 54 Connecting piece 57 Filling part

Claims (5)

A tubular body,
A shoulder portion formed separately from the body portion and fixed to the open end of the body portion;
A mouth formed integrally with the shoulder,
A method of manufacturing a tube container, comprising: a tube container provided with a cap screwed to the mouth, and using a plurality of mold members,
As the plurality of mold members,
A sleeve holding part through which the sleeve to be the body part is inserted, a mouth forming part that stands on the sleeve holding part and forms the inner surface of the mouth part, and connects the sleeve holding part and the mouth forming part. A male mold having a shoulder inner surface molding portion for molding the inner surface of the shoulder portion,
Using a concave shoulder outer surface molding portion that molds the outer surface of the shoulder portion, and a female mold that is provided on the bottom surface of the shoulder outer surface molding portion and that includes a cap housing recess that houses the cap,
The sleeve is inserted into the sleeve holder, the cap is accommodated in the cap accommodating recess, and the compatibility between the male mold and the female mold is high with respect to the sleeve and low with respect to the cap. A molding step of forming a molded product by aligning the male mold and the female mold in a state where the intermediate material that is the annular body is arranged,
A releasing step of releasing the male mold and the female mold from the molded article,
In the forming step, the intermediate material is softened between the shoulder inner surface forming portion and the shoulder outer surface forming portion to form the shoulder portion while being fixed to the opening end portion of the sleeve, and the mouth portion forming portion. And a method of manufacturing a tube container, characterized in that the tube container is made to flow into the space between the caps to be molded into the mouth portion.   The method for manufacturing a tube container according to claim 1, wherein the intermediate material is the same material as the sleeve. The outer peripheral surface of the mouth forming portion gradually reduces in diameter as it is separated from the sleeve holding portion along the axial direction of the mouth forming portion,
The tube container according to claim 1 or 2, wherein the inner peripheral surface of the cap is gradually reduced in diameter as the inner peripheral surface is separated from the opening end of the cap along the axial direction of the cap. Method. A weakened portion is formed at the opening end of the cap and extends over the entire circumference in the circumferential direction of the cap,
The weakened portion includes a plurality of connecting pieces arranged at intervals in the circumferential direction,
In the forming step, when forming the intermediate material into the mouth portion, the intermediate material is filled between the connecting pieces adjacent to each other in the circumferential direction to form a filling portion. 4. The method for manufacturing the tube container according to any one of 1 to 3. A tubular body,
A shoulder portion formed separately from the body portion and fixed to the open end of the body portion;
A mouth formed integrally with the shoulder,
A tube container comprising a cap screwed to the mouth,
The inner surface of the cap and the outer surface of the mouth are releasably adhered, and when the cap is rotated with respect to the mouth to separate from the mouth, the inner surface of the cap and the mouth The outer surface is peeled off,
A weakened portion is formed at the opening end of the cap and extends over the entire circumference in the circumferential direction of the cap,
The weakened portion includes a plurality of connecting pieces arranged at intervals in the circumferential direction,
The tube portion is characterized in that a filling portion filled between the connecting pieces adjacent to each other in the circumferential direction is integrally formed in the mouth portion.

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