JP2019196232A - Container with cap - Google Patents

Abstract

To provide a container with a cap capable of obtaining high sealability even if capping with a low load and carrying out alignment.SOLUTION: In a container 20 with a cap including a cap 10 mounted on a mouth part of a container body, the cap includes a cap body 6 comprising a top plate part and a cylindrical peripheral wall part, and a liner 1; a curled part 5a is formed at an upper end part of the mouth part; the cap is deformed at a peripheral edge of the top plate part together with the liner by shoulder-drawing processing; the curled part includes an outer peripheral surface upper part formed at an upper part of an outer peripheral surface and a bent part formed under the outer peripheral surface upper part and bent to the inside in a radial direction; the liner includes an adhesion surface adhered from the outer peripheral surface upper part to the bent part; a part disposed under the adhesion surface out of the liner is positioned at the outside in the radial direction of the outer peripheral surface upper part and is not brought into contact with the curled part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a container with a cap particularly suitable for a thin bottle can.

Conventionally, there is a method for manufacturing an in-shell mold cap in which a mold resin is dropped on a top plate portion of a cap body composed of a top plate portion and a cylindrical peripheral wall portion depending from a peripheral edge of the top plate portion, and a liner is molded. Are known. In this case, the liner is known to have a flat shape, a peripheral edge having a constant width and a uniform thickness, or a peripheral edge that thickens at a constant angle toward the outer periphery. (For example, refer to Patent Document 1).
Moreover, the cap which provided the liner with the groove shape in which the opening | mouth part of a container main body is fitted is also proposed (for example, refer patent document 2).

Generally, metal caps are used for aluminum bottle cans and the like. When this metal cap is capped at the mouth of the bottle can body, a so-called roll-on cap method is usually employed. That is, after covering the mouth part where the male thread part is formed, forming a female thread part on the cylindrical peripheral wall part along the male thread part of the mouth part from the side by a roller while applying a constant load from above. Therefore, screw forming and capping are performed simultaneously.
At this time, so-called shoulder drawing is also performed. That is, the top plate portion is pressed in the hanging direction of the cylindrical peripheral wall portion by the pressure pad, and at the same time, the shoulder block is processed by the pressure block to further deform the peripheral edge of the top plate portion together with the liner in the hanging direction of the cylindrical peripheral wall portion. .

JP 2011-37497 A JP 2008-201435 A

The following problems remain in the conventional technology.
In recent years, thinner bottle cans have been studied, and capping a cap with a conventional heavy load on a thinner bottle can body reduces the plate thickness of the mouth and lowers the column strength. There was a problem that the male screw part buckled and the opening torque increased. For this reason, if capping is performed with a low load, the side seal length, which is the length that the outer peripheral portion of the liner deformed by shoulder drawing processing is in close contact with the outside of the mouth portion, cannot be sufficiently secured, resulting in poor sealing performance. There was an inconvenience. In particular, when the conventional liner is flat to the outer periphery, the side seal length becomes insufficient.
In addition, when the part that contacts the mouth is simply flat like the conventional liner, if the liner is non-adhesive to the cap, the axis between the bottle can body and the liner will be misaligned during capping. In some cases, alignment was not possible. In addition, when there is a stepped shape due to a steep slope or a grooved shape, the upper end of the mouth may be displaced beyond the stepped portion or grooved portion, and alignment cannot be performed as described above. There was a case. In particular, in the case of having a groove shape with a crest on the inside (liner described in Patent Document 2, etc.), when the cap is re-opened after opening, the upper end of the mouth hits the crest and is difficult to close. There is a problem.
When alignment is not possible in this way, there is a disadvantage that a portion having an insufficient side seal length occurs in the circumferential direction, and the sealing performance is also partially reduced. Furthermore, when a liner with an outer peripheral portion that increases in thickness toward the outer periphery is installed in a non-contact manner on the cap, alignment is possible with the inclined outer peripheral portion, but the liner mouth is in contact The part to be used is thin, and sufficient sealing performance cannot be obtained.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a container with a cap that can provide high sealing performance and can be aligned even when capped with a low load.

  The present invention employs the following configuration in order to solve the above problems. That is, the container with a cap according to the first invention is a container with a cap in which a cap is attached to the mouth portion of the container body, and the cap is a cylindrical peripheral wall suspended from the top plate portion and the periphery of the top plate portion. A cap with a liner comprising a cap body formed of a portion and a liner provided in the cap body, and a curled portion folded outward is formed at an upper end portion of the mouth portion. The peripheral edge of the top plate portion is deformed together with the liner in the direction of drooping by shoulder drawing, and the curled portion is formed at the upper portion of the outer peripheral surface formed at the upper portion of the outer peripheral surface and below the upper portion of the outer peripheral surface. A bent portion bent inward in the radial direction, and the liner has a close contact surface reaching from the upper part of the outer peripheral surface to the bent portion, and is below the close contact surface of the liner Disposed portion, characterized in that located radially outward from the outer peripheral surface upper not in contact with the curled portion.

  According to a second aspect of the present invention, there is provided a container with a cap according to the first aspect, wherein the liner is formed in a disk shape with a constant thickness and on a radially outer side than the first flat portion. An inclined portion that gradually becomes thicker toward the outer periphery, and the liner includes a sliding layer disposed on an inner surface side of the top plate portion, and a sealing layer laminated on the sliding layer, and the sealing The layer is formed in a disc shape with a certain thickness, and the first flat portion is radially outside the first flat portion, and at least the portion where the upper end of the mouth is in contact with the first flat portion. It has the 2nd flat part formed thickly and flat, and the said inclination part which is formed in the radial direction outer side of the said 2nd flat part, and becomes thick gradually toward the outer periphery, It is characterized by the above-mentioned.

In the above-mentioned container with a cap, the inclined portion formed thicker toward the outside at the time of capping sufficiently adheres to the outside of the mouth portion even if the deformation amount of shoulder drawing is small, and is aligned by the tapered inclined portion. It is possible to ensure a uniform and sufficient side seal length in the circumferential direction.
Further, the close contact surface of the inclined portion is not longer than the curled portion, and it is easy to tighten when the cap is attached to the mouth portion again after opening the cap.
Further, in the container with a cap, since the sealing layer has the first flat portion, the second flat portion, and the inclined portion, the inclined portion formed thicker toward the outside at the time of capping is the shoulder throttle. Even if the deformation amount of processing is small, it can be sufficiently adhered to the outside of the mouth portion and aligned by a tapered inclined portion, thereby ensuring a uniform and sufficient side seal length in the circumferential direction. . Moreover, since the part which the upper end of an opening | mouth part contacts is a 2nd flat part thicker than a 1st flat part, high sealing performance can be acquired also in this part by sufficient thickness.

Moreover, in this container with a cap, even if it caps the said cap with a liner with low load in mouth parts, such as a thin-walled bottle can main body, high sealing performance can be acquired.
In addition, the inclined part is in close contact with the upper part of the outer peripheral surface of the curl part, and a high sealing performance is obtained by the thick second flat part. is doing.

The present invention has the following effects.
According to the cap-equipped container according to the second aspect of the invention, the liner is aligned in the capping state, so that there is no positional shift and high sealing performance is achieved.
Therefore, in the present invention, even when capping the thin-walled bottle can body with a low load, the sealing performance is high and the liner can be aligned, so that uniform sealing performance can be obtained even in the circumferential direction.

In one Embodiment of the container with a cap which concerns on this invention, it is an expanded sectional view of the principal part which shows the liner for caps. In this embodiment, it is sectional drawing (a) which shows the half of the state which put the cap on the opening part, and the expanded sectional view (b) of the principal part. In this embodiment, it is sectional drawing (a) which shows the half of the state which capped the cap at the opening | mouth part, and the expanded sectional view (b) of the principal part. In the conventional example of the container with a cap which concerns on this invention, it is an expanded sectional view of the principal part which shows the liner for caps. In the prior art example of this invention, it is sectional drawing (a) which shows the half of the state which put the cap on the opening | mouth part, and the expanded sectional view (b) of the principal part. In the conventional example of this invention, it is sectional drawing (a) which shows the half of the state which capped the cap at the opening part, and the expanded sectional view (b) of the principal part. It is sectional drawing of the principal part for showing the dimension of each part about the Example of the container with a cap which concerns on this invention. It is a graph which shows the relationship between a top pressure and the side seal length about the Example which concerns on this invention.

  Hereinafter, an embodiment of a container with a cap according to the present invention will be described with reference to FIGS. 1 to 6. Note that in the drawings used for the following description, the scale of some of the members is appropriately changed in order to make each member recognizable or easily recognizable.

The cap liner 1 of the present embodiment is, for example, for an aluminum bottle can (so-called aluminum can) as shown in FIGS. 1 to 3, and seals the mouth portion 5 of the container body 4 and the top plate portion 6 a. It is provided in the cap main body 6 which consists of the cylindrical surrounding wall part 6b hanging down from the periphery of the top-plate part 6a.
The entire cap liner 1 is formed of a synthetic resin in a disc shape, and is installed rotatably with respect to the cap body 6.

The cap liner 1 includes a sliding layer 2 disposed on the inner surface side of the top plate portion 6 a and a sealing layer 3 laminated on the sliding layer 2 and more flexible than the sliding layer 2.
The sealing layer 3 includes a first flat portion 3a formed in a disk shape with a constant thickness, and a first flat portion at a portion that is radially outward of the first flat portion 3a and at least the upper end of the mouth portion 5 contacts. It has the 2nd flat part 3b formed more thickly flat than 3a, and the inclination part 3c which is formed in the radial direction outer side of the 2nd flat part 3b, and becomes thick gradually toward the outer periphery.

  Moreover, the cap 10 with a liner of this embodiment is a cap with a liner that seals the mouth portion 5 of the container body 4, and the above-described top plate portion 6 a and the cylindrical peripheral wall portion 6 b that hangs down from the periphery of the top plate portion 6 a. And a liner 1 provided on the inner surface of the top plate portion 6a.

  When installing the liner 1 by the in-shell mold method, a certain amount of a soft resin such as an elastomer extruded and melted from the extruder in the in-shell mold process is put into the cap body 6 in which the sheet of the sliding layer 2 is inserted, The sealing layer 3 having the shape including the first flat portion 3a, the second flat portion 3b, and the inclined portion 3c is formed with the mold immediately cooled. The shape of the sealing layer 3 is smaller than the outer diameter of the sliding layer 2 and draws a concentric circle.

Furthermore, the container 20 with a cap of this embodiment is an aluminum bottle can or the like in which the cap 10 is attached to the mouth portion 5 of the container body 4. That is, this cap-equipped container 20 is provided with the cap 10 wound around the mouth part 5 which is a mouthpiece part.
A curled portion 5 a that is folded outward is formed at the upper end portion of the mouth portion 5. The curled portion 5a is formed by curling the upper end portion of the mouth portion 5 and throttle processing for caulking the curled portion. Therefore, the outer peripheral surface of the curled portion 5a has a flat surface by throttle processing.

Further, the cap 10 is deformed by shoulder drawing in the direction of the drooping together with the liner 1 along the periphery of the top plate portion 6a, and the inclined portion 3c is in close contact with the outer peripheral surface of the curled portion 5a. That is, the inclined portion 3c is in close contact with the flat surface of the outer peripheral surface of the curled portion 5a.
The inclined portion 3c is in close contact with the outer peripheral surface of the curled portion 5a above the lower end 5b of the curled portion 5a.

Thus, as shown in FIG. 3, the curled portion 5a includes an upper portion of the outer peripheral surface formed at the upper portion of the outer peripheral surface, and a bent portion formed at a lower portion than the upper portion of the outer peripheral surface and bent inward in the radial direction. have.
Moreover, in this container 20 with a cap, the said inclination part 3c has the contact surface which reached from the said outer peripheral surface upper part to the said bending part, and contact | adhered.
Further, a portion of the liner 1 disposed below the contact surface is located radially outside the upper portion of the outer peripheral surface and is not in contact with the curled portion 5a.

The sliding layer 2 is made of PP (polypropylene), HDPE (high density polyethylene), PVC (polyvinyl chloride), various nylons, PET (polyethylene terephthalate), PAN (polyacrylonitrile), PBT (polybutylene terephthalate), PC ( (Polycarbonate) or the like.
As the sealing layer 3, an elastomer or a blend of a resin and an elastomer is employed. As the elastomer, an olefin elastomer, a styrene elastomer, a polyamide elastomer, a polyester elastomer, a polyurethane elastomer, a vinyl chloride elastomer, or the like is employed. Is possible.

  The cylindrical peripheral wall portion 6b includes a knurl (not shown), a liner locking projection 6c, a perforation 6d, a bead (not shown), and a skirt portion 6e. The liner locking projection 6c has a triangular or semicircular cross section that is recessed inside the cylindrical peripheral wall 6b, and a plurality of the liner locking protrusions 6c are arranged at intervals in the circumferential direction so as to protrude inward. It has a function of supporting the liner 1 from its lower surface side, a vent function of releasing pressure inside the can, and a function of a substantial cleaning port.

The cap 10 is placed on a container body 4 such as a so-called bottle can molded with a metal such as an aluminum alloy, and the cap 10 is capped and attached to the mouth 5 by being capped. A container 20 with a cap is formed.
Since the liner 1 is not bonded to the cap 10 when the cap 10 is put on the mouth part 5, the axis of the liner 1 is made to be the axis of the mouth part 5 by the inclined surface of the inclined part 3c facing inward. Alignment is performed by moving the liner 1 itself so as to match. At this time, the upper end of the mouth portion 5 is positioned and arranged at the outer edge portion of the second flat portion 3b, that is, the boundary portion with the inclined portion 3c.

The capping process is performed using a capping device including a pressure block, a screw roller, a skirt roller, and the like.
That is, the top plate portion 6a of the cap 10 that covers the mouth portion 5 is pressed toward the bottom of the bottle with the pressure block, and in this state, the cap inclined portion 6f is formed on the shoulder portion of the cap 10 by drawing with the pressure block. To do. Further, in this state, the screw portion 6g is formed by the screw roller, and the skirt portion 6e is wound around the turnable portion 5c of the mouth portion 5 by the skirt roller, whereby the capping process is performed.

As the cap 10 is wound around the mouth portion 5 in this manner, the cap 10 is brought into a state where the liner 1 on the inner surface side of the top plate portion 6 a is pressed against the mouth portion 5. Thereby, the content of the container 20 with a cap will be in the state sealed. The filling of the contents is naturally performed immediately before the cap 10 is put on the container 20 with the cap.
On the other hand, when the cap is opened, the cap 10 is turned and cut from the perforation 6d, and the cap 10 is removed from the mouth portion 5, whereby the mouth portion 5 is opened and the contents are taken out. Then, by reattaching the removed cap 10 to the mouth portion 5, it is possible to reclose the cap.

  Thus, in the cap liner 1 of the present embodiment, the sealing layer 3 includes the first flat portion 3a, the second flat portion 3b, and the inclined portion 3c. Even if the inclined portion 3c formed thickly adheres to the outside of the mouth portion 5 even if the deformation amount of the shoulder drawing process is small, it is uniform in the circumferential direction by being aligned by the tapered inclined portion 3c. A sufficient side seal length SSL can be secured. Moreover, since the part which the upper end of the opening | mouth part 5 contacts is the 2nd flat part 3b thicker than the 1st flat part 3a, high sealing performance can be obtained also in this part by sufficient thickness.

Therefore, in the cap with a liner 10 of the present embodiment, by using the liner 1, high sealing performance can be obtained even when capping the mouth 5 such as a thin bottle can body with a low load.
Furthermore, in the container 20 with a cap of the present embodiment, the inclined portion 3c is in close contact with the outer peripheral surface of the curled portion 5a using the cap 10 with a liner, and a high sealing property is provided by the thick second flat portion 3b. As a result, the liner 1 is aligned at the time of capping, so that there is no positional shift and high sealing performance is obtained.
Further, since the inclined portion 3c is in close contact with the outer peripheral surface of the curled portion 5a above the lower end of the curled portion 5a, the inclined portion 3c is not longer than the curled portion 5a, and the cap 10 is opened again after opening. It becomes easy to tighten when it is attached to 5 and plugged.

An embodiment of a container with a cap according to the present invention will be described with reference to FIGS.
As an example of the present invention, in a 38 mm bottle, as shown in FIG. 7, the radial length (width) L1 of the second flat portion 3b and the inclined portion 3c, and the radial length (width) of the inclined portion 3c. ) A plurality of different L2s, the thickness T1 of the second flat portion 3b, and the maximum thickness T2 of the inclined portion 3c were produced. Typical examples are shown in Tables 1 and 2. The “10 ° taper” shown in Table 1 is Example 1 shown in Table 2. Further, “20 ° taper” in Table 1 is Example 2.

In addition, the angle θ of the inclined surface of the inclined portion 3c in Example 1 is 10 °, and the angle θ (angle with respect to the second flat portion) of the inclined surface of the inclined portion 3c in Example 2 is 20 °. In all the examples, the thickness T0 of the first flat portion 3a was set to 0.25 mm.
About the Example produced in this way, capping and shoulder drawing are performed on the mouth, and the result of measuring the side seal length SSL for the top pressure at that time is shown in FIG.

The side seal length SSL is taken with reference to the screw start of the male threaded portion of the mouth, taking X-ray cross-sectional photographs at three equal intervals of 0 °, 120 °, and 240 °, and the straight portion of the curled portion (by throttle processing) The length along the flat portion was measured (5 × 3 equidistant = 15 data average values were plotted in FIG. 8).
For comparison, a conventional example in which there is no inclined portion 3c and only the first flat portion 3a and the second flat portion 3b were produced and evaluated in the same manner.

As a result, in the embodiment of the present invention, the side seal length SSL is 17 to 22% longer than that of the conventional example at the same top pressure, and the sealing performance is improved. Moreover, the side seal length SSL became longer when the angle θ of the inclined surface of the inclined portion 3c was larger. Furthermore, in the embodiment of the present invention, the axial deviation (positional variation) from the central axis is less than that in the conventional example.
Note that there is a correlation between the top pressure and the side seal length SSL, and when the top pressure is increased, the side seal length SSL is also increased.

  From these evaluation results, the radial length L2 of the inclined portion 3c is preferably in the range of 1.0 mm ≦ L2 ≦ 1.7 mm. That is, in the case of a 38 mm bottle, when L2 exceeds 1.7 mm, the boundary P between the second flat portion 3b and the inclined surface 3c is too close to the center side of the cap and enters the inner side of the upper end of the mouth. As a result, the centering effect (alignment effect) is reduced. On the other hand, if L2 is less than 1.0 mm, the boundary P between the second flat portion 3b and the inclined portion 3c is too close to the outside, making it difficult to ensure the side seal length SSL.

  Further, the maximum thickness T2 of the inclined portion 3c is preferably in the range of 1.0 mm ≦ T2 ≦ 1.3 mm. That is, if T2 exceeds 1.3 mm, the effect of securing the side seal length SSL remains the same, but the amount of resin used increases. Moreover, when T2 is less than 1.0 mm, the outermost peripheral thickness of the sealing layer 3 becomes thin, and it becomes difficult to sufficiently secure the side seal length SSL.

  Furthermore, the angle θ of the inclined surface of the inclined portion 3c is preferably in the range of 10 ° ≦ θ ≦ 20 °. That is, when θ exceeds 20 °, the effect of securing the side seal length SSL is not changed. If θ is less than 10 °, the centering effect cannot be sufficiently obtained.

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

  DESCRIPTION OF SYMBOLS 1 ... Cap liner, 2 ... Sliding layer, 3 ... Sealing layer, 3a ... 1st flat part, 3b ... 2nd flat part, 3c ... Inclination part, 4 ... Container main body, 5 ... Mouth part, 5a ... Curl part 6 ... Cap body, 6a ... Top plate part, 6b ... Cylindrical peripheral wall part, 10 ... Cap with liner, 20 ... Container with cap

Claims (2)

A container with a cap with a cap attached to the mouth of the container body,
The cap is a cap with a liner provided with a cap body comprising a top plate portion and a cylindrical peripheral wall portion depending from the periphery of the top plate portion, and a liner provided in the cap body,
A curled portion that is folded outward is formed at the upper end of the mouth,
The cap is deformed by shoulder drawing in the direction of the drooping together with the liner at the periphery of the top plate portion,
The curled portion has an outer peripheral surface upper portion formed at an upper portion of the outer peripheral surface, and a bent portion formed at a lower portion than the upper outer peripheral surface and bent inward in the radial direction,
The liner has a close contact surface that reaches from the upper part of the outer peripheral surface to the bent portion and is in close contact,
A portion of the liner that is disposed below the contact surface is located radially outside the upper portion of the outer peripheral surface and does not contact the curled portion. The container with a cap according to claim 1,
A first flat portion formed in a disc shape with a constant thickness, the liner;
An inclined portion that is formed radially outward from the first flat portion and gradually increases in thickness toward the outer periphery;
The liner is a sliding layer disposed on the inner surface side of the top plate part,
A sealing layer laminated on the sliding layer,
The sealing layer is a first flat portion formed in a disk shape with a constant thickness;
A second flat portion that is formed on the outer side in the radial direction of the first flat portion and at least a portion that is in contact with the upper end of the mouth portion and is thicker than the first flat portion;
A capped container having the inclined portion that is formed on the radially outer side of the second flat portion and gradually increases in thickness toward the outer periphery.