Tube container

Abstract

To improve the appearance and secure fastening strength between a sleeve and a head in a tube container.SOLUTION: A tube container comprises: a cylindrical sleeve (13); and a head (14) having a plate-like base part (15) and a mouth part (16) erected from the base part (15) and configured to close an opening of one end (13a) of the sleeve (13). A peripheral edge part (17a) of the base part (15) is fastened to the one end (13a) and the one end (13a) linearly extends in an axial direction of the sleeve (13). The peripheral edge part (17a) includes: a flange part (21) fastened to an axial end surface (13c) of the one end (13a); and an outer periphery part (22) fastened to an inner peripheral surface (13d) of the one end (13a). The head (14) includes an annular protruding part (23) protruding downward from the base part (15). An outer peripheral surface (23a) of the protruding part (23) is fastened to the inner peripheral surface (13d) of the one end (13a) at the lower side of the outer periphery part (22).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a tube container. [Background technology]

[0002] Conventionally, a tube container has been known that includes a cylindrical sleeve and a head having a mouth that closes the opening at one end of the sleeve, with the peripheral edge of the head fixed to one end of the sleeve (see, for example, Patent Document 1). In the tube container of Patent Document 1, one end of the sleeve is formed as a bent portion in which the upper end of the sleeve is bent radially inward, and this bent portion is fixed to the peripheral edge of the head. This ensures a large bonding area between the one end of the sleeve and the peripheral edge of the head, resulting in high bonding strength. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-40293 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the tube container of Patent Document 1, in order to prevent the sleeve from breaking when forming the bent portion in the sleeve, it is necessary to set a relatively large radius of curvature at the bent portion, and the large bent portion affects the appearance of the tube container. Furthermore, at such a bent portion, wrinkles may occur in the sleeve due to bending deformation, which may impair the appearance of the tube container. For example, wrinkles are particularly likely to occur when the sleeve has a laminate structure in which multiple layers including an aluminum layer are stacked. On the other hand, if the sleeve does not have a bent portion, it is difficult to ensure the strength of the bond between the sleeve and the head.

[0005] In view of the above, an object of the present invention is to provide a tube container that can improve the appearance and ensure the strength of the attachment between the sleeve and the head. [Means for solving the problem]

[0006] The tube container comprises a cylindrical sleeve, a plate-shaped base, and a head having a mouth portion erected from the base and closing the opening at one end of the sleeve, the peripheral portion of the base being fixed to the one end, the one end extending linearly in the axial direction of the sleeve, the peripheral portion comprising a flange portion fixed to the axial end face of the one end and an outer peripheral portion fixed to the inner peripheral surface of the one end, the head comprising an annular protrusion protruding downward from the base, the outer peripheral surface of which is fixed to the inner peripheral surface of the one end below the outer peripheral portion. [Effects of the Invention]

[0007] According to the present invention, the appearance of the tube container can be improved and the strength of the attachment between the sleeve and the head can be ensured. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of a tube container according to a first embodiment of the present invention. [Figure 2] 2 is an enlarged cross-sectional view of the connection between the head and the sleeve in FIG. 1. FIG. [Figure 3] 10A to 10C are diagrams illustrating an example of a method for manufacturing a container body. [Figure 4] FIG. 10 is an enlarged cross-sectional view of a connection portion between a head and a sleeve in a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of a tube container according to the present invention will be described with reference to the drawings. [First embodiment] Fig. 1 is a side view of a tube container 10 according to a first embodiment of the present invention, in which approximately half of the right side of Fig. 1 is shown in cross section.

[0010] The tube container 10 includes a container body 11 for storing the contents, and a cap 12 attached to the container body 11. The contents of the tube container 10 are not particularly limited, but may be, for example, viscous substances such as cosmetics and food. The container body 11 includes a cylindrical sleeve 13 and a head 14 fixed to one end 13a of the sleeve 13 in the axial direction.

[0011] The sleeve 13 is a tube formed by cutting a tube body continuously formed by extrusion molding or the like into a predetermined length in the axial direction. The sleeve 13 is made of synthetic resin. The sleeve 13 alone has one end 13a and the other end (not shown) open in the axial direction. The opening at one end 13a of the sleeve 13 is closed by fixing the head 14 to the one end 13a. The opening at the other end of the sleeve 13 is closed by fixing the other end by a method such as welding while the opposing inner surfaces at the other end are brought into contact with each other. When viewed in the axial direction, the sleeve 13 has a shape that follows the outer shape of the head 14. The outer shape of the head 14 may be circular or rectangular when viewed in the axial direction. The shape of the sleeve 13 is flattened at the lower part of the sleeve 13 and tapers toward the other end. In FIG. 1, the tube container 10 is shown in an upright position in which the tube container 10 is upright so that the axis 13b of the sleeve 13 is oriented in the vertical direction.

[0012] The head 14 includes a plate-shaped base 15 and a cylindrical mouth 16 that stands upright from the base 15. The head 14 is a component that is formed separately from the sleeve 13. The head 14 is made of synthetic resin. The base 15 includes a shoulder 17 extending radially inward from one end 13a of the sleeve 13, and a cylindrical upward extension 18 extending radially inward and upward from the center of the shoulder 17. The head 14 is fixed to one end 13 a of the sleeve 13 via a radially outer peripheral edge 17 a of the shoulder 17 .

[0013] The mouth portion 16 stands upright from the upper end of the upward extension portion 18. The mouth portion 16 is cylindrical and arranged coaxially with the sleeve 13, and is arranged on the axis 13b. An outer periphery engaging portion 16a that engages with the cap 12 is provided on the outer periphery of the mouth portion 16. The outer periphery engaging portion 16a is a male thread portion. The lower end of the mouth 16 is provided with a bottom plate 16b extending radially inward from the inner circumferential surface of the mouth 16, and a hole 16c penetrating the bottom plate 16b in the axial direction (vertical direction).

[0014] The mouth 16 is fitted with a check valve 19 for preventing backflow of the contents and a nozzle 20. The check valve 19 includes a cylindrical portion 19a that fits onto the inner peripheral surface of the opening 16, and a plate-shaped valve element 19b that is connected to the lower end of the cylindrical portion 19a. The valve element 19b covers the opening at the lower end of the cylindrical portion 19a in an openable and closable manner. In Figure 1, the state in which the valve element 19b has moved in the opening direction is shown by imaginary lines. The base end of the nozzle 20 fits onto the inner periphery of the cylindrical portion 19a of the check valve 19. The content of the container body 11 passes through the mouth portion 16 and is discharged from the opening 20a at the tip of the nozzle 20.

[0015] The cap 12 includes a cylindrical mounting portion 12a that is mounted on the mouth portion 16, a disk-shaped upper wall portion 12b that closes the opening 20a from above, and a cylindrical peripheral wall portion 12c that surrounds the mounting portion 12a from the periphery. The mounting portion 12a extends downward from the center of the upper wall portion 12b. The peripheral wall portion 12c extends downward from the peripheral edge of the upper wall portion 12b. The mounting portion 12a and the peripheral wall portion 12c are arranged coaxially with the sleeve 13. The cap 12 is attached to the mouth portion 16 by engaging an inner peripheral engaging portion 12d provided on the inner periphery of the attachment portion 12a with an outer peripheral engaging portion 16a. The inner peripheral engaging portion 12d is a female thread portion.

[0016] FIG. 2 is an enlarged cross-sectional view of the connection portion between the head 14 and the sleeve 13 in FIG. 1 and 2, the head 14 has a peripheral edge 17 a of a shoulder 17 fixed to one end 13 a of the sleeve 13 . The one end 13a is a cylindrical portion that extends linearly in the axial direction of the sleeve 13. The one end 13a is the upper end of the sleeve 13.

[0017] The shoulder 17 extends obliquely radially inward and upward from the one end 13a. The peripheral edge 17a of the shoulder 17 has a flange 21 fixed to the axial end face 13c of the one end 13a, and an outer peripheral portion 22 fixed to the inner peripheral surface 13d of the one end 13a below the flange 21. The head 14 also includes a protrusion 23 that protrudes downward from the lower surface 17b of the peripheral edge 17a of the shoulder 17. The lower surface 17b is shown in phantom lines in Figure 2. The protrusion 23 is annular and is disposed coaxially with the sleeve 13.

[0018] The flange portion 21 is an annular portion that protrudes radially outward from the outer periphery 22 at the upper portion of the peripheral edge portion 17a. The lower surface of the flange portion 21 is fixed to the end surface 13c of the one end portion 13a by welding. The end surface 13c is the upper end surface of the one end portion 13a. The side and top surfaces of the outer end of flange 21 are chamfered into a curved shape by chamfered portions 21a. The radius of curvature of chamfered portions 21a is equal to or smaller than the thickness t2 of one end 13a. Note that the corners of flange 21 may be edges without providing chamfered portions 21a. The portion of the upper surface of the shoulder portion 17 that is radially inward of the chamfered portion 21a forms a flat plane portion 17c. The lower end of the outer circumferential surface of the flange portion 21 is flush with the outer circumferential surface of the one end portion 13a.

[0019] The outer circumferential portion 22 of the peripheral edge portion 17a extends linearly in the vertical direction along the inner circumferential surface 13d of the one end portion 13a. The outer circumferential portion 22 is a stepped portion where the peripheral edge portion 17a is recessed radially inward relative to the flange portion 21, and extends from the lower surface of the flange portion 21 to the lower end of the peripheral edge portion 17a. The outer circumferential portion 22 is fixed to the inner circumferential surface 13d of the one end portion 13a by welding.

[0020] The outer peripheral surface 23a of the protrusion 23 extends linearly in the vertical direction along the inner peripheral surface 13d of the one end portion 13a. The outer peripheral surface 23a and the outer peripheral portion 22 of the peripheral edge portion 17a have the same diameter, and the outer peripheral surface 23a is continuous with the outer peripheral portion 22. The outer peripheral surface 23a of the protrusion 23 is fixed to the inner peripheral surface 13d of the one end portion 13a by welding. A protrusion inner peripheral surface 23b, which is the inner peripheral surface of the protrusion 23, extends obliquely downward and radially outward from the lower surface 17b of the peripheral edge portion 17a and is connected to the lower end of the outer peripheral surface 23a.

[0021] 1 and 2, in a cross-sectional view perpendicular to the axial direction of the sleeve 13, the protrusion inner circumferential surface 23b has a downwardly convex curve. Therefore, the radial thickness t1 of the protrusion 23 decreases downward. In the first embodiment, the protrusion inner circumferential surface 23b has a downwardly convex curve rather than an upwardly convex curve, so that the thickness t1 can be ensured to be large over the entire length (height) of the protrusion 23.

[0022] The thickness t1 of the protruding portion 23 is greater than the thickness t2 of the one end portion 13a. In the vertical direction, the length L1 of the protrusion 23 is longer than the length L2 of the outer periphery 22 of the peripheral edge 17a. Furthermore, the length L2 of the outer circumferential portion 22 is longer than the length L3 of the flange portion 21 in the vertical direction.

[0023] In this way, the peripheral edge 17a of the shoulder 17 of the head 14 is fixed to the one end 13a that extends linearly in the axial direction of the sleeve 13, and the one end 13a is not bent toward the inside in the radial direction of the sleeve 13. This makes it possible to avoid the formation of a large curved surface at the connection (fixing portion) between the peripheral edge 17a of the head 14 and the one end 13a.

[0024] As shown in Figures 1 and 2, the outer diameter of the peripheral wall portion 12c of the cap 12 is approximately the same as the outer diameter of the sleeve 13, and the outer peripheral surface of the peripheral wall portion 12c and the outer peripheral surface of the sleeve 13 are continuous, giving the tube container 10 a neat appearance. Specifically, the radially outer portion of the peripheral wall portion 12c of the cap 12 forms an overlapping portion 12e that radially overlaps the position of one end portion 13a of the sleeve 13. The overlapping portion 12e is located outside the imaginary line shown within the peripheral wall portion 12c in FIG.

[0025] A lower end 12f of the peripheral wall 12c faces a flat portion 17c provided on the upper surface of the shoulder portion 17 of the base 15 outside the mouth 16 from above. In this way, when the peripheral wall portion 12c of the cap 12 has the overlapping portion 12e, the lower end portion 12f of the peripheral wall portion 12c faces the flat portion 17c of the shoulder portion 17, thereby reducing the gap G between the lower end portion 12f and the shoulder portion 17. This increases the sense of unity between the peripheral wall portion 12c of the cap 12 and the sleeve 13, improving the appearance of the tube container 10.

[0026] Furthermore, the flange portion 21 of the head 14 is fixed to the axial end face 13c of the one end 13a, and the outer peripheral portion 22 and the outer peripheral surface 23a of the protruding portion 23 are fixed to the inner peripheral surface 13d of the one end 13a. This allows the head 14 to be fixed to the one end 13a in the axial and radial directions, and also ensures a large area for the fixed portion. Therefore, even if the one end 13a is linear, the head 14 can be firmly fixed to the sleeve 13.

[0027] Fig. 3 is a diagram illustrating an example of a method for manufacturing the container body 11. Fig. 3 illustrates a molding step, which will be described later. The container body 11 is manufactured by compression molding using a mandrel 30 and a mold 40 . The mandrel 30 is inserted into the sleeve 13 and comes into contact with the inner peripheral surface of the sleeve 13. A lower surface 30a of the mandrel 30 in FIG. The mold 40 comprises a first mold 41 having a shoulder molding portion 41a corresponding to the shape of the outer surface of the shoulder portion 17, a second mold 42 having a shape corresponding to the outer periphery of the mouth portion 16, a third mold 43 having a shape corresponding to the tip of the mouth portion 16, and a fourth mold 44 having a shape corresponding to the inner periphery of the mouth portion 16. The first mold 41 has a cylindrical outer periphery guide portion 41b that receives the outer periphery of one end portion 13a of the sleeve 13. The outer periphery guide portion 41b extends linearly in the axial direction along the one end portion 13a.

[0028] The manufacturing method of the container body 11 includes an insertion step of inserting the mandrel 30 into the sleeve 13, a material fitting step of fitting the punched head 14 material into the sleeve 13 after the insertion step, and a molding step of forming the head 14 material in a cavity formed between the mandrel 30 and a mold 40 to form the head 14 and fix the peripheral portion 17a and the protrusion 23 to one end 13a, as shown in Figure 3.

[0029] In the material fitting process, the material of the head 14 is heated and softened, and then punched out by a punch and fitted into the sleeve 13 . In the molding process, the material of the head 14, which has been softened by heating, is compressed between the mandrel 30 and the mold 40 to form the head 14, and the head 14 is welded to the one end 13a. In the molding process, the one end 13a of the sleeve 13 is radially supported by the outer circumferential guide portion 41b of the first mold 41. The flange portion 21 is formed by the material of the head 14 that is filled into the cavity between the end face 13c of the one end 13a and the shoulder molding portion 41a. After the molding process, the container body 11 is removed from the mandrel 30 and the mold 40. The other end of the sleeve 13 is closed by welding or other means after the container body 11 is filled with the contents.

[0030] In the container body 11, the head 14 has the protrusion 23, and the protrusion 23 is fixed to the one end 13a, so that the area of the fixed portion between the head 14 and the one end 13a can be increased. 2, the thickness t1 of the protruding portion 23 is greater than the thickness t2 of the one end portion 13a, and therefore the temperature of the protruding portion 23 is maintained to a certain extent when the temperature of the head 14 drops after molding. This allows the protruding portion 23 to be well welded to the one end portion 13a. Furthermore, since the length L1 of the protruding portion 23 in the vertical direction is longer than the length L2 of the outer circumferential portion 22, the temperature of the protruding portion 23 can be maintained at a good level during welding.

[0031] As described above, according to the first embodiment of the present invention, the tube container 10 includes a cylindrical sleeve 13, a head 14 having a plate-like base 15 and a mouth 16 extending upright from the base 15 and closing an opening at one end 13a of the sleeve 13, and a peripheral edge 17a of the base 15 fixed to the one end 13a. The one end 13a extends linearly in the axial direction of the sleeve 13, and the peripheral edge 17a includes a flange 21 fixed to an axial end face 13c of the one end 13a and an outer peripheral portion 22 fixed to an inner peripheral surface 13d of the one end 13a. The head 14 includes an annular protrusion 23 protruding downward from the base 15, and the outer peripheral surface 23a of the protrusion 23 is fixed to the inner peripheral surface 13d of the one end 13a below the outer peripheral portion 22. According to this configuration, the head 14 is fixed to the axial end face 13c of the one end 13a of the sleeve 13 by the flange portion 21 of the peripheral edge portion 17a of the base 15, and is fixed to the inner circumferential surface 13d of the one end 13a by the outer circumferential portion 22 of the peripheral edge portion 17a of the base 15 and the outer circumferential surface 23a of the protruding portion 23. This allows the peripheral edge portion 17a of the head 14 to be fixed to the one end 13a of the sleeve 13 in the axial and radial directions of the sleeve 13, thereby increasing the fixing strength between the sleeve 13 and the head 14. Furthermore, the provision of the protruding portion 23 increases the area of the fixing portion between the head 14 and the one end 13a, allowing the head 14 to be firmly fixed to the one end 13a. Furthermore, the one end 13a of the sleeve 13 extends linearly in the axial direction of the sleeve 13 and is not bent radially inward, thereby improving the appearance of the tube container 10. Furthermore, since the one end 13a is not bent radially inward but is straight, the occurrence of wrinkles in the sleeve 13 due to bending can be suppressed, and the appearance of the tube container 10 is good.

[0032] In addition, in a cross-sectional view perpendicular to the axial direction of the sleeve 13, the protrusion inner circumferential surface 23b has a curved shape that is convex downward. According to this configuration, the inner peripheral surface 23b of the protrusion is curved downwardly, so that the thickness t1 of the protrusion 23 can be secured large, and the protrusion 23 can be firmly fixed to the inner peripheral surface 13d of the one end 13a.

[0033] In addition, the head 14 is fixed to one end 13a by welding, and in a cross-sectional view perpendicular to the axial direction of the sleeve 13, the thickness t1 of the protrusion 23 is greater than the plate thickness t2 of the one end 13a, and in the vertical direction, the length L1 of the protrusion 23 is longer than the length L2 of the outer circumferential portion 22. According to this configuration, the temperature of the protruding portion 23 can be maintained at a level suitable for welding, and the head 14 can be welded to the one end portion 13a in a satisfactory manner.

[0034] Furthermore, a cap 12 is provided which includes an attachment portion 12a that is attached to the mouth portion 16 and a cylindrical peripheral wall portion 12c that surrounds the attachment portion 12a from the outside, and the peripheral wall portion 12c is provided so as to overlap the position of one end portion 13a in the radial direction, and a lower end portion 12f of the peripheral wall portion 12c faces from above a flat portion 17c that is provided on the upper surface of the base portion 15 outside the mouth portion 16. According to this configuration, when the peripheral wall portion 12c of the cap 12 is provided so as to overlap the position of the one end portion 13a in the radial direction, the lower end portion 12f of the peripheral wall portion 12c faces the flat portion 17c on the upper surface of the base portion 15, thereby reducing the gap G between the lower end portion 12f of the peripheral wall portion 12c and the upper surface of the base portion 15. This improves the appearance of the tube container 10 and prevents foreign matter from entering the cap 12 through the gap G between the lower end portion 12f of the peripheral wall portion 12c and the upper surface of the base portion 15.

[0035] [Second embodiment] A second embodiment to which the present invention is applied will be described below with reference to Fig. 4. In this second embodiment, parts configured in the same manner as in the first embodiment will be given the same reference numerals and descriptions thereof will be omitted.

[0036] FIG. 4 is an enlarged cross-sectional view of the connection portion between the head 14 and the sleeve 13 in the second embodiment. The second embodiment differs from the first embodiment in that a protrusion 223 is provided instead of the protrusion 23 of the first embodiment. The head 14 has a protrusion 223 that protrudes downward from the lower surface 17b of the peripheral edge 17a of the shoulder 17. The lower surface 17b is shown in phantom lines in Figure 4. The protrusion 223 is annular and is arranged coaxially with the sleeve 13.

[0037] An outer peripheral surface 223a of the protrusion 223 extends linearly in the vertical direction along the inner peripheral surface 13d of the one end portion 13a. The outer peripheral surface 223a and the outer peripheral portion 22 of the peripheral edge portion 17a have the same diameter, and the outer peripheral surface 223a is continuous with the outer peripheral portion 22. The outer peripheral surface 223a of the protrusion 223 is fixed to the inner peripheral surface 13d of the one end portion 13a by welding.

[0038] 4, in a cross-sectional view perpendicular to the axial direction of the sleeve 13, the protrusion inner peripheral surface 223b, which is the inner peripheral surface of the protrusion 223, extends obliquely linearly downward and radially outward from the lower surface 17b of the peripheral edge portion 17a and is connected to the lower end of the outer peripheral surface 223a. Therefore, the radial thickness t3 of the protrusion 223 decreases downward. In the second embodiment, the protrusion inner peripheral surface 223b extends obliquely linearly rather than in an upwardly convex curve, so that the thickness t3 of the protrusion 223 can be ensured to be large throughout the entire length (height) of the protrusion 223. Furthermore, the thickness t3 of the protruding portion 223 is greater than the plate thickness t2 of the one end portion 13a.

[0039] Although one embodiment of the present invention has been described above, the present invention is not limited to the specific embodiment, and unless otherwise limited in the above description, various modifications and variations are possible within the spirit and scope of the present invention as defined in the claims. For example, the configurations of the above-described embodiment may be added or deleted as appropriate, and the configurations of one embodiment may be incorporated into other embodiments. Furthermore, the effects of the above-described embodiment are merely examples of the effects resulting from the present invention, and do not mean that the effects of the present invention are limited to the above-described effects. In the above embodiment, the container body 11 is described as being manufactured by compression molding, but the present invention is not limited to this, and the container body 11 may also be manufactured by injection molding, for example, in which molten resin that will become the material for the head 14 is injected into a cavity. Alternatively, the sleeve 13 may have a laminate structure in which a metal sheet made of, for example, an aluminum-based material is laminated on a main body of the sleeve 13 made of synthetic resin. In this case, one end 13a of the sleeve 13 extends linearly, and the one end 13a having the laminate structure is not bent radially inward, thereby preventing wrinkles from occurring at the one end 13a. [Explanation of symbols]

[0040] 10: Tube container 12: Cap 12a: Mounting part 12c: Peripheral wall part 12f: Bottom end 13: Sleeve 13a: One end 13c: End face 13d: Inner surface 14: Head 15: Base 16: Mouth 17a: Periphery 17c: Flat part 21: Flange part 22: Outer periphery 23,223:Protrusion 23a, 223a: Outer surface 23b, 223b: Inner peripheral surface of protrusion t1: Thickness (thickness of protrusion) t2: Plate thickness (plate thickness at one end) L1: Length (length of protrusion) L2: Length (length of outer periphery)

Claims

1. A tube container comprising: a cylindrical sleeve; a head having a plate-like base and a mouth portion extending from the base and closing an opening at one end of the sleeve; and a peripheral edge of the base fixed to the one end, The one end portion extends linearly in the axial direction of the sleeve, the peripheral edge portion includes a flange portion fixed to an axial end surface of the one end portion, and an outer circumferential portion fixed to an inner circumferential surface of the one end portion, the head includes an annular projection projecting downward from the base; The outer peripheral surface of the protrusion is fixed to the inner peripheral surface of the one end portion below the outer peripheral portion.

2. The tube container according to claim 1 , wherein an inner peripheral surface of the protrusion has a downwardly convex curved shape in a cross section perpendicular to the axial direction of the sleeve.

3. the head is fixed to the one end by welding; 2. The tube container according to claim 1, wherein, in a cross-sectional view perpendicular to the axial direction of the sleeve, the thickness of the protrusion is greater than the plate thickness of the one end, and the length of the protrusion in the vertical direction is longer than the length of the outer circumferential portion.

4. a cap including a mounting portion that is mounted on the mouth portion and a cylindrical peripheral wall portion that surrounds the mounting portion; the peripheral wall portion is provided so as to overlap the one end portion in the radial direction, The tube container according to claim 1 , wherein a lower end of the peripheral wall portion faces from above a flat portion provided on the upper surface of the base portion outside the mouth portion.

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