JP5057023B2 - Easy-open container and manufacturing method thereof - Google Patents

Description

  The present invention relates to an easy-open container and a method for producing the same, and more particularly to an easy-open container having a high sealing property and having an easy-open structure for easily opening cans and a method for producing the same.

  Conventionally, canned foods have generally been sealed by double-tightening the can lid around the can body. As a simple opening structure, a score is formed on the can lid panel surface, and the opening tab is fixed with rivets inside the score. However, it is widely used that the score is opened by raising the tab. In the form of opening by breaking the score, the opening panel is completely separated from the can lid and opened to a wide mouth, or the opening panel is not separated from the can lid such as a steion tab lid that opens to a narrow mouth However, the wide-mouth opening is superior in terms of the ease of taking out the contents. However, in the case of the conventional wide-mouthed opening lid, since the opening panel is broken from the score, the edge is exposed over the entire circumference and the safety is inferior, and the score is located somewhat inward from the periphery of the lid. , There was a disadvantage that the contents could not be completely put out.

In order to solve the safety aspect of the conventional wide-open container, for example, the entire circumference of the opening score part is covered with a flexible protective ring (Patent Document 1), and the panel part is folded into an S-shaped cross section in triplicate There have been proposed ones in which stacked annular multi-layer portions are formed to ensure the safety of the opening pieces (Patent Document 2).
Japanese Utility Model Publication No. 63-23317 JP 2000-190963 A

The wide opening of the conventional double-clamping can has the above-mentioned problems, and the ones shown in Patent Documents 1 and 2 have been proposed in order to ensure the safety of the score cutting edge exposed on the entire circumference. However, since the structure is complicated, the cost is increased, and the score remains inward from the periphery of the lid, the problem of complete removal of contents has not been solved.
Therefore, the present invention is a novel easy-open structure that can be opened separately from the can body without the cutting edge due to the score, and can be completely taken out of the contents, and the contents can be taken out easily. It is an object of the present invention to provide an easy-open container having the above and a method for producing the same.

  The present inventor has made various studies in order to solve the above-mentioned problems. However, a conventional double winding type sealing structure in which the can body and the can lid are firmly integrated with each other at the winding part and cannot be separated. As long as there is no change, it is understood that there is no fundamental solution to the above problem, and as a result of various researches on whether the sealing structure of cans is contrary to the common sense of double-tightening, there is no alternative sealing structure. A novel sealing structure that can be easily opened and can be easily separated from the winding tightening part while securing a high degree of sealing performance as in the case of fastening has been obtained, and the present invention has been achieved.

  That is, the easy-open container of the present invention according to claim 1 includes a can body including an annular bead formed at an opening end of the body portion, an inclined double wall extending outwardly from the outer peripheral surface of the panel, A curled portion formed on the outer top portion of the inclined double wall, and a lid provided with an opening means, and the engagement between the annular bead and the curled portion, and the lower inner surface of the annular bead and the inclined double wall. The easy-opening sealing fixing structure is formed by the engagement, and the sealing fixing structure is released by the opening means so that the lid body can be separated from the opening end of the can body.

According to a second aspect of the present invention, in the easy-open container according to the first aspect, the lower side of the inner surface of the annular bead is an inwardly tapered wall.
According to a third aspect of the present invention, in the easy-open container according to the first aspect, the lower side of the inner surface of the annular bead is a substantially horizontal wall.
According to a fourth aspect of the present invention, in the easy-open container according to any one of the first to third aspects, a liner is provided at an engagement portion between the curl portion of the lid and the annular bead of the can body. It is a feature.
The invention according to claim 5 is the easy-open container according to any one of claims 1 to 4, wherein the opening means is an opening tab provided in the vicinity of the inclined double wall of the panel. To do.
The invention according to claim 6 is the easy-open container according to claim 5, wherein the opening tab is engaged with a part of the inclined double wall so that a part of the inclined double wall faces inward. The opening tab has an inclined double wall engaging portion to be deformed.
Further, the invention according to claim 7 is the easily openable container according to any one of claims 1 to 6, further comprising means for forming a vent hole in the lid portion prior to the operation of separating the lid member from the trunk portion. It is characterized by that.
Furthermore, the invention according to claim 8 is the easy-open container according to any one of claims 1 to 7, wherein the easy-open container has an open end opposite to the lid of the can body, and the opening The lower lid body is tightly wound and sealed after the contents are filled in the part.

  Moreover, the manufacturing method of the easy-open container of this invention of Claim 9 which solves the said problem is carried out from the panel outer peripheral surface in the opening part of the can cylinder provided with the annular bead formed in the opening edge part of the trunk | drum. A step of placing a lid having a double wall extending substantially vertically, a curl portion formed on the outer top of the double wall, and an opening means; and deforming the curl so as to surround the annular bead, From the step of engaging the annular bead and the curl portion, and the step of forming the inclined double wall by deforming the double wall of the can lid into an outer inclined shape so as to be engaged below the inner surface of the annular bead of the can body It is characterized by.

The easy-open container of the present invention can secure a large-diameter opening, and can directly pour out the contents from the end of the can body without the can-clamping portion remaining on the can body. In addition, since the end of the can body is an annular bead, the content can be poured out smoothly and completely. Furthermore, since the edge of the score break does not occur at the spout and is in the form of an annular bead, it is highly safe and can be taken directly from the can body without a sense of incongruity like a normal cup. Further, unlike the conventional steion tab, the broken panel does not come into contact with the content liquid and is clean. Furthermore, even if a synthetic resin laminated metal plate is used as the material of the lid, there is no risk that foreign matter such as feathering that occurs when the score breaks will be mixed into the content liquid, so the synthetic resin laminated metal plate is easy to use as a container material. .
In addition to the engagement between the annular bead and the curled portion, the sealing structure is particularly hermetically fixed by the engagement between the inner surface of the annular bead and the inclined double wall. Even if it is a positive pressure can such as beer, carbonated drink, or liquid nitrogen filled can, it can be reliably sealed and can be easily opened and opened by the opening means.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the lower side of the inner surface of the annular bead and the inclined double wall can be more easily engaged and sealed.
According to the invention of claim 3, in addition to the effect of the invention of claim 2, the pressure resistance can be further improved.
According to the invention of claim 4, in addition to the effect of the invention of claim 1, a higher degree of sealing performance can be secured.
According to invention of Claim 5, in addition to the said effect, it can open very easily by raising and pulling an opening tab.
According to the invention of claim 6, since the tip of the opening tab contacts the lower inner surface of the inclined double wall, a part of the inclined double wall can be easily deformed inward by raising the opening tab, The sealing structure can be easily released and opened.
According to the invention of claim 7, since the vent is formed in the lid part before opening, the inside can be degassed and the blowout of the contents at the time of opening can be prevented. Easy to wake up and easier to open.
According to invention of Claim 8, the can which has the said easy-open structure can be easily manufactured with the existing can production line.

  According to invention of Claim 9, the double wall of a cover body can be reliably engaged with the taper wall of a can body, and the easy-open container which has the said sealing structure can be assembled and produced easily.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of an easy-open container according to an embodiment of the present invention, and FIG. 2 is a front cross-sectional view of a sealed can after filling the contents. An easy-open container 1 according to this embodiment includes a can body 2 having upper and lower ends opened, and an easy-open lid 3 that seals the upper end opening of the can body, and is filled with the lower end of the body open. The product is supplied to the factory and filled with the contents in an inverted state. After filling, the lower lid 4 is double-rolled around the can body to obtain an easy-open canned product 5 as shown in FIG.

In this embodiment, the can body 2 is made of a seamless cylindrical body that is open at the top and bottom, the upper opening end is necked in to form an inward tapered wall 6, and the outer diameter of the can body 2 is formed at the top end. An annular bead 7 having a smaller cross-sectional arc shape is formed at the opening end of the body 2. Further, a flange 8 for lower lid winding is formed at the lower end of the opening. On the other hand, when the easy-open lid 3 is attached and fixed to the can body 2 of FIG. 1, a curled portion 10 surrounding the can is formed on the outer peripheral portion of the lid, and the curled portion is closely fitted to the annular bead 7. Thus, the annular bead 7 is formed in a substantially U-shaped cross section having the same diameter as that of the annular bead 7, and the inner wall thereof is pressed along the inner tapered wall 6 of the trunk portion and extends downwardly to form an outer inclined wall 11. The lower end thereof is bent into a U shape and extends upward to form the inner inclined wall 14, and the inclined double wall portion 13 is formed by the outer inclined wall 11 extending from the curled portion. The inner inclined wall 14 of the inclined double wall portion 13 extends upward and continues to the panel surface 15. Note that a liner 16 is disposed at the top joint between the annular bead 7 and the curled portion 10 to achieve a more complete seal.
Examples of liners that can be used include those that are frequently used as cap liners, such as soft vinyl chloride resin having excellent cushioning properties or foams thereof, styrene elastomers, and polyurethanes. In addition, it is possible to employ a form in which a sheet-shaped resin is punched into an annular shape, or a powder resin is supplied to the inner surface of the curled portion and the liner is fixedly formed by heat treatment or the like.

  Accordingly, the can body 2 and the easy-open lid 3 are formed by the close fitting of the annular bead 7 and the curled portion 10 and the inner tapered wall 6 below the inner surface of the annular bead 7 and the outer inclined wall 11 of the inclined double wall. The upper opening of the trunk is sealed by the engagement. Then, the close fitting of the annular bead 7 and the curled portion 10 and the engagement of the inner tapered wall 6 and the outer inclined wall 11 below the inner surface of the annular bead 7 are engaged in a downwardly widening manner as shown in the figure. Therefore, even if it is going to remove the easy-open lid 3 from the trunk | drum in that state, it cannot be separated by resistance of a taper part, and cannot open. Therefore, the following means are provided as the opening means.

  In the vicinity of the inclined double wall portion 13 of the panel surface 15, an unsealing tab 20 that constitutes a means for unsealing the lid is attached to a rivet 21 that protrudes from the panel surface by rivet processing. As shown in FIG. 4, for example, the tab 20 is engaged with a part of the inclined double wall at the opposite end portion where the finger hook portion 23 is formed with the rivet fitting hole 22 interposed therebetween. 1 so as to form an engaging portion that deforms a part thereof inward, and is formed into a shape having a bent end portion 24 bent downward, and the bent end portion 24 is an inclined double wall as shown in FIG. It is positioned so as to fit into the portion 13. In the vicinity of the rivet 21 on the panel surface 15, a score 25 is formed that surrounds the semi-periphery of the rivet and extends substantially circumferentially from both ends thereof. The score 25 is for preventing liquid from being blown at the time of opening by forming a vent hole in the panel surface prior to the operation of separating the easy-open lid 3 from the can body 2 as described later. Although it is provided in order to facilitate the deformation of the inclined double wall portion by lifting the opening tab at the time of opening, it is not always essential. As shown in FIG. 3, the score 25 is preferably a Kilroy score, but the shape of the score is not necessarily limited thereto.

The easy-open container 1 of the present embodiment has the above-described sealing structure, and cans using the container can be easily opened as shown in FIGS. 5 and 6.
When a finger is engaged with the finger hooking portion 23 of the unsealing tab 20 and pulled up, a shearing force is applied to the panel surface via the rivet 21, and the score formed on the periphery of the rivet is broken. The boundary of the heavy wall 13 rises as a fulcrum 14A. As a result, as the bent end portion 24 of the unsealing tab 20 rotates, the inner inclined wall 14 of the inclined double wall portion 13 is pushed inward about the fulcrum 14A as shown in FIG. The wall portion 13 is inclined inward, and the outer inclined wall 11 and the inner tapered wall 6 below the inner surface of the annular bead 7 are partially disengaged, and the annular bead 7 and the curled portion 10 are fitted. In this state, when the opening tab is pulled upward, as shown in FIG. 6, the looseness of the joint portion of the body portion and the easy-open lid body spreads all around, and the easy-open lid body 3. Can be easily removed from the can body 2.

  Therefore, according to this sealing structure, the entire lid can be completely removed from the body, and unlike the conventional container in which the panel surface is broken and removed from the score and the wide opening is opened, the cutting edge of the score has an opening. The lid is not formed on the body, and the lid tightening part does not remain in the body part, so that the entire body part opening can be opened, and the contents can be easily poured out, and It can be taken out without remaining.

FIG. 7 is a cross-sectional view of another easy-open container according to an embodiment of the present invention, in which a substantially horizontal wall 9 is formed below the inner surface of an annular bead formed inside the opening end of the can body 2. The lower side of the inner surface of the annular bead 7 is engaged with the inclined double wall 13 of the lid 5, and the other configuration is the same as that of the easy-open container described above.
And by setting it as such a structure, pressure | voltage resistance can further be improved.

Next, the manufacturing method of the easy-open container which has the above sealing structures is demonstrated.
FIG. 8 shows a manufacturing process of the easy-open lid 3. The easy-open lid first forms the lid shell 30 into the shape shown in FIG. In this state, the outer portion 10B of the portion 10A that becomes the curled portion 10 is inclined slightly more loosely than the final shape, the portion that becomes the inner inclined wall is in a vertical state, and the lower end thereof is folded back into a U-shape to form the vertical double wall portion 13A. Are connected to the central panel portion 15. In this way, the outer portion 10B of the curled portion is gently inclined and the portion that becomes the inclined double wall portion is formed in the vertical double wall portion, so that it is easy to attach the easy-open lid to the can body. The lid can be fitted into the opening of the can body. Next, the lid shell 30 formed in this manner is placed in an inverted state on the liner coating rotary jig 31 and rotated from the coating nozzle 32 to the curl portion 10 while rotating as shown in FIG. 16 is applied. Next, the score 25 and the rivet 21 are formed on the panel surface 15 by a well-known method ((c) in the figure). In the final step, the opening tab 20 is riveted to the rivet 21 to obtain the easy opening lid 3 shown in FIG.

  Next, a method for manufacturing the can body 2 shown in FIG. 7 described above as an example will be described with reference to FIG. In this embodiment, the can body is a seamless body portion, which is drawn and ironed from an aluminum plate or tin-free steel plate that forms a normal can body, or a metal plate obtained by coating a resin film such as a PET film on these metal plates. Forming. First, as shown in FIG. 6A, the cup 32A is drawn from a metal plate, and after final drawing-ironing, stretch draw (thinning drawing), or stretch draw-ironing, the final result is obtained. A thin redraw can 32B having a predetermined inner diameter is obtained. Next, in the curl portion drawing step, the bottom portion of the redraw can 32B is drawn with a die 33 having a shape that is gradually reduced from the inner diameter of the redraw can 32B and a punch 34 having a diameter substantially equal to the opening diameter of the final body portion. Thus, the inner tapered wall 6 is formed in the vicinity of the bottom of the redraw can (FIG. 5B). Then, the bottom 35 is removed by trimming the lower end portion of the vertical annular wall portion 39 for forming the curled portion from the inner tapered wall with a cutter 36 (FIG. 5C), and finally curl molding. In the process, the circular bead 7 is formed by curling the vertical annular wall portion outward by a cylindrical bead forming die 40 by a known appropriate method, and the substantially horizontal wall 9 is formed by pressing the forming die 40 ( (D) in the figure. Further, a flange 8 for double winding is formed at the other opening end. The can body 2 is formed as described above.

Next, a method for sealingly attaching (clinching) the easy-open lid 3 to the can body 2 obtained as described above will be described with reference to FIG.
The can body 2 and the easy-open lid 3 are hermetically attached by the cooperation of the curl pressing die 40A as the upper die and the inclined double wall die 41 as the core die. The curled portion pressing die 40A includes an annular forming groove 44 having a reverse J-shaped cross section having a vertical portion 43 whose outer side extends in a tangential direction from the semicircular arc portion 42 as shown in the drawing. On the other hand, the inclined double wall mold 41 has a cylindrical shape with a diameter smaller than that of the body of the easy-open container manufactured by the diameter, and the top 46 is a flat surface slightly smaller in diameter than the diameter of the panel surface of the easy-open lid. And an inclined double wall forming surface 48 inclined in a truncated cone shape from the outer peripheral surface of the top portion toward the cylindrical outer peripheral surface 47. The inclined double molding surface 48 is inclined at an angle at which the vertical double wall 13A of the easy-open lid 3A presses and engages the lower side of the inner surface of the annular bead of the can body.

  An easy-open lid is placed on the annular bead 7 of the can body 2 between the inclined double wall forming die 41 and the curl pressing die 40A formed as described above, and the inclined double wall in that state is supplied. When the wall molding die 41 and the curl portion pressing die 40A are relatively approached from above and below, the vertical portion 43 of the curl portion pressing die 40A is brought into pressure contact with the outer portion 10B of the curl portion 10A, and the outer portion 10B is connected to the annular bead 7. The annular bead top is pressed by the semicircular arc portion 42 and an axial load is applied to the liner 16 applied to the inner peripheral surface of the curled portion. Adhere closely. At the same time, as the inclined double mold 41 rises, the inclined double molded surface 48 becomes the lower end of the inner wall of the vertical double wall portion 13 of the easy-open lid, as shown in FIGS. It rises while being pressed in the vicinity of the part, is formed into an inclined double wall, and is crimped by being pressed against the inner inclined wall of the trunk. Thereby, the trunk portion and the easy-open lid body are tightly joined, and the lid body can be firmly fixed to the trunk portion even in a container having a positive pressure inside.

As mentioned above, although embodiment of the easy-open container which concerns on this invention was described, the easy-open container of this invention is not restricted to the said embodiment, A various design change is possible within the range of the technical idea. For example, the unsealing means is not limited to the unsealing tab of the above-described embodiment, and may be any one that can disengage the inner tapered wall of the can body by deforming a part of the inclined double wall inward at the time of unsealing. The shape does not matter. Further, the score formed on the panel surface is not necessarily required, and the score may not be formed if a means for deforming the inclined double wall inward is employed without forming the score. Further, in the above-described embodiment, the score may be formed in an appropriate shape, such as forming the end of the semicircular arc portion surrounding the rivet so as to expand toward the outer peripheral portion in a fan shape. Further, the can body is not necessarily seamless, and can be applied to a can body having a side seam portion such as an adhesive can body or a welded can body. Further, the container is not necessarily limited to a circular cross section, and can be applied to a non-circular container such as an ellipse or a polygon.
Moreover, although the other opening end of the can body illustrated the form which forms the flange for double winding which winds a cover body, the sealing method of the other opening end after filling with contents is limited to double winding However, other sealing means such as heat sealing using a heat sealing material can also be applied.

  The easy-open container of the present invention can be suitably applied to filling any content, such as solids, powder, high viscosity content, liquid content, etc. Since it can be safely in contact with the mouth, it can be applied to beers that could only be applied to cans with a partial opening, and the contents can be completely dispensed, so small-volume drinks, etc. It can be suitably used as a sealed container.

It is front sectional drawing of the easy-open container which concerns on embodiment of this invention. It is front sectional drawing of the can by the easy-open container which concerns on embodiment of this invention. FIG. It is a perspective view of the opening tab which concerns on embodiment of this invention. It is front sectional drawing of the easy-open container which shows the deformation | transformation state of the inclination double wall at the time of opening. It is front sectional drawing of the easy-open container which shows the state which the cover body isolate | separated from the can body after opening. It is front sectional drawing of the other easy-open container which concerns on embodiment of this invention. It is manufacturing process explanatory drawing of the lid body of the easy-open container which concerns on embodiment of this invention. It is manufacturing process explanatory drawing of the can body of the easy-open container which concerns on embodiment of this invention. It is explanatory drawing of the process of mounting and fixing to the can body of the easy-open container which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Easy-open container 2 Can body 3 Easy-open lid body 4 Lower lid body 5 Easy-open canned container 6 Inner taper wall 7 Annular bead 8 Flange 9 Substantially horizontal wall 10 Curled part 11 Outer inclined wall 13 Inclined double wall 14 Inner inclined Wall 14A Supporting point 15 Panel surface 16 Liner 20 Unsealing tab 21 Rivet 22 Rivet fitting hole 23 Finger hooking portion 24 Bending end 25 Score 30 Lid shell 31 Rotating jig for liner application 33 Die 34 Punch 35 Bottom portion 36 Cutter 39 Vertical annular wall portion 40 Annular bead forming die 40A Curled portion pressing die 41 Double wall forming die 42 Semicircular arc portion 43 Vertical portion 44 Annular forming groove 46 Top portion

Claims (9)

  A can body having an annular bead formed at an open end of the body portion, an inclined double wall extending outwardly from the outer peripheral surface of the panel, a curl portion formed on an outer top portion of the inclined double wall; and A lid provided with an opening means, and an easy-open sealing fixing structure is formed by engagement of the annular bead and the curl portion, and engagement between the lower side of the inner surface of the annular bead and the inclined double wall, and the opening means The easy-opening container is configured such that the sealing and fixing structure is released and the lid body can be separated from the opening end of the can body.   The easy-open container according to claim 1, wherein an inner taper wall is provided below the inner surface of the annular bead.   The easy-open container according to claim 1, wherein a lower side of the inner surface of the annular bead is a substantially horizontal wall.   The easy-open container according to any one of claims 1 to 3, wherein a liner is provided at an engaging portion between the curled portion of the lid and the annular bead of the can body.   The easy-open container according to any one of claims 1 to 4, wherein the opening means is an opening tab provided in the vicinity of the inclined double wall of the panel.   The easy-open container according to claim 5, wherein the opening tab is an opening tab having an engaging portion that engages with a part of the inclined double wall and deforms a part of the inclined double wall inward. .   The easy-open container according to any one of claims 1 to 6, further comprising means for forming a vent hole in the lid prior to the operation of separating the lid from the body.   The easy-open container according to any one of 1 to 7 is configured such that an end portion of the can body opposite to the lid body is opened, and the lower lid body is wound and sealed after filling the opening with contents. Easy-open container.   A double wall extending substantially vertically from the outer peripheral surface of the panel, a curl formed on the outer top of the double wall, and an opening at the opening of the can body having an annular bead formed at the opening end of the body A step of placing a lid provided with means, a step of deforming the curl so as to surround the annular bead and engaging the annular bead with the curled portion, and a double wall of the can lid on the can body A process for producing an easily openable container comprising the step of forming an inclined double wall by deforming into an outer inclined shape so as to engage with an inner surface of an annular bead.

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