JPS62220229A - Can shell and its manufacture - Google Patents

Abstract

PURPOSE:To manufacture the can shell of a corned beef with high efficiency by performing the forming and heat adhesion with a forming and bumping mechanism after forming a tongue piece and score by punching a sector blank from the metal plate sticking the end edge of an adhesive tape. CONSTITUTION:Sectorial blanks 1a, 1b, 1c are punched from the medium plate strip sticking a thermoplastic adhesive tape 2 at the one end edge and a tongue piece 4 and two pieces of scores 3a, 3b are formed on the sectorial blanks 1a, 1b, 1c.... Both side and edges 26a, 26b of the formed sectorial blank are heated, bent with a forming and bumping mechanism 30 and bonded by pressing with a hammer 18 and anvil 19. The corned beef can shell is made by very simple stage and its production efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a can body, and more particularly to a method for manufacturing a truncated pyramid-shaped can body equipped with a tongue piece for winding and opening, such as corned beef cans.

Prior art and its problems Japanese Patent Application Laid-Open No. 60-21133 discloses a method for manufacturing a can body having a lap seam bonded with a thermoplastic adhesive and a two-score. .

The prior art described in this publication prevents the thermoplastic adhesive present in the wrap seam from deteriorating due to the concentrated heating that occurs when washing the tongue and the notch provided at the base of the tongue. It is possible to produce an adhesive layer that has a combination of unwinding performance, sealing performance, corrosion resistance, and hygienic properties. However, in the conventional technology, each blank that has been cut and scored is first introduced into a heating device, and the edges on both sides are preheated before being coated with adhesive tape, which requires a great deal of labor and time. This tends to consume more energy and increase manufacturing costs.

OBJECTS OF THE INVENTION It is an object of the present invention to provide an economical production of truncated pyramidal can bodies, which has a reliably operating take-up and unsealing mechanism and a reliable lap seam adhesive layer, which significantly reduces manufacturing costs. The purpose is to provide a method.

It is an object of the present invention to provide a wrap seam bonded with a thermoplastic adhesive, a winding tongue integrally formed at the outer end edge, and a winding tongue extending from the base of the tongue to the can body. A method for manufacturing a can body having at least two scores extending around the entire circumference of the can body, the method comprising: adhering an adhesive tape to one side edge of a metal plate of a predetermined width; The tape is attached by punching out a number of fan-shaped blanks extending in the width direction of the metal plate, and working together with a truncated pyramid-shaped horn that three-dimensionally tapers the individual fan-shaped blanks on which the tongues and scores are formed. This is achieved by the can 111ii1) method of the present invention, which is characterized by forming and adhering by a forming and bumping mechanism comprising a wing member.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the method of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

Referring to FIG. 1, an intermediate plate blank 11 is shown, which is a large plate that has been painted and printed and is cut into a width B corresponding to the length of the blank by passing it through a slitter. adhesive tape 2
is applied to the upper side edge of the intermediate plate blank 11 using a film applicator (not shown).

As shown in Figure 1α, the adhesive tape 2 is attached to the middle plate blank 1.
1, that is, the surface 11 disposed on the outer surface of the can body.
b is pasted by the width of the lap seam, covering the side edge 11c of the middle plate blank 11, further covering the surface on the opposite side of the middle plate blank 110, that is, the inner surface 11α of the can body, by a predetermined width C, and It is formed so as to wrap around the side edge C of the plate blank 11.

As shown in Fig. 2, adhesive tape 2 is pasted on the upper end,
A large number of fan-shaped blanks 1α, lb, lty whose lower ends extend in the width direction of the intermediate plate blank 11.

ld... is punched out using a press mechanism (not shown).

As shown in FIG. 3, individual fan-shaped blanks 1α.

1b+1"+1'... are formed with two scores 3α, 3b separated at a predetermined interval using an appropriate punch or roller (not shown). The scores 3α, 3b are formed on each fan-shaped blank 1α. , 1b, 1c, . . . adjacent to the left edge of the can body.

Figures 4 and 5 show the process of forming the tongue piece 4 provided on the can body of a corned beef can.
1 h+ 1 c... At the end opposite to the end to which the adhesive tape 2 is attached, the elongated band-like parts 5a, 5h located on both sides of the tongue piece 4 are cut off by appropriate shearing devices 6α, 6.
1 to form a tongue piece 4. Tongue piece 4
and the score may be formed at the same time as the fan-shaped blank is punched.

Further, at the end portions to which the adhesive tape 2 is attached, corner portions 5c at both ends.

5.% (FIG. 4) is removed by shearing devices 6h, 6g (FIG. 5).

FIG. 6 shows how the tongue pieces 4 of each sector blank 1α, 1b, 1c, . . . are bent at right angles using a bending die.

Subsequently, as shown in FIG. 7, each fan-shaped blank 1α+1"
The right end of +1', ie, the side edge portion to which the adhesive tape 2 is attached, is bent slightly downward using a bending die 9. 12b shows the gripping force of the area adjacent to the adhesive tape 2 of each fan-shaped blank during the folding process. At the same time, the edge portions of each of the fan-shaped blanks lα, 1b, 1c, . . . adjacent to the tongue piece 4 are bent slightly upward. 12α
indicates the force with which each fan-shaped blank is gripped during this folding operation.

The downward bending of the right end and the whitening of the left end of each fan-shaped blank shown in FIG. There should be sufficient space between the edges to accommodate the adhesive tape in the position where the adhesive tape is placed.

FIG. 8 shows the process of heating both side edges of each fan-shaped blank 1α+1b+1'...
, 14b are heated to a required temperature by passing through the bosom portions 14α, 14b of the high-frequency heating devices 13α, 13b, respectively.

FIG. 9 shows the forming and bonding process of a corned beef can body having a winding tongue 4, and a forming and bumping mechanism 30 is used. The forming and bumping mechanism 30 includes an elongated truncated pyramid-shaped forming horn 15 and a forming horn 15 that cooperates with the forming horn 15.
It is composed of a wing member 16. The forming horn 15 has a rectangular cross section and includes an elongated anvil 19 fitted in a longitudinal groove 25 provided at the center of the lower side. The anvil 19 has a cooling mechanism 20 such as a cooling water mantle in the center.
It has α. The forming wing member 16 is rotatably connected to the forming wing member 16 by a hinge 17 provided at the upper part of the left wing horn 15 of the forming horn 15. Each wing half-rest 16α, 16b is provided with a placket (22CL, 22b) provided on the upper outer side thereof.

A drive rod such as a piston rod extending from a drive mechanism (not shown) such as a hydraulic cylinder is connected to the blankets 22α, 22b via connection pins 21α, 21h. Therefore, the pair of wing half-rests 16α and 16b open and close between an operating position in which the foam horn 15 shown in the figure is held in from both sides and an open position in which the wings 170 are expanded in a "V" shape on both sides. A hammer 18 is installed on the lower side facing the anvil 19 so as to be movable up and down. The hammer 18 is equipped with a cooling water pipe 20h at its upper end.

The forming and pumping mechanism 30 places both wing halves 16cL and 16b in the open position and introduces the individual fan-shaped blanks 1α, IA, lc... into the upper part of the forming horn 15, and then Individual sector blank lα+ 1” when closed to working position, IC
... is pressed against the outer periphery of the horn 15 and formed into a predetermined truncated pyramid shape, and then the adhesive tape 2 of each fan-shaped blank is attached to the end edge 26b.
Lay them both on top of each other with the side facing down. Thereupon, the hammer 18 is moved upwardly and an impact is applied to both edges 26α and 26h to bond them. The adhesive has an upper and lower cooling mechanism 20α, 20h after impact.
It is immediately hardened by K.

FIG. 10 shows a can body 10 formed and bonded by the forming and bumping mechanism 30 of FIG.
, 3h. Further, the adhesive 2 is as shown in Figure LOb. Not only are the lap seams of both edges 26α and 26b bonded together, but the outer edge is wrapped around and extends to the outer peripheral surface of the can body.

Effects of the Invention The effects of the present invention are as follows: Prior to the punching operation of the fan-shaped blanks 1α, 1-A, and 1c, an adhesive tape is attached to the middle plate 11, and the tape is heated immediately before being applied to the forming and bumping mechanism 30. This not only greatly simplifies the handling of adhesive tapes, but also simplifies the entire process of making can bodies, saving time and labor and reducing manufacturing costs.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the process of applying the adhesive tape of the present invention, Fig. 1α is a sectional view taken along line 11α-11α in Fig. 1, and Fig. 2 is a plan view showing the process of punching a fan-shaped blank. , FIG. 3 is a plan view showing the score stamping process, FIG. 4 is a plan view showing the tongue forming process, FIG. 5 is a cross-sectional view showing the shearing device used in the process shown in FIG. 4, and FIG. FIG. 7 is a cross-sectional view showing the step of folding the tongue piece; FIG. 7 is a cross-sectional view showing the step of folding both edges of the fan-shaped blank; FIG. 8 is a cross-sectional view showing the step of heating both edges of each fan-shaped blank; FIG. 9 is a cross-sectional view showing the forming and punching process, FIG. 10 is a perspective view showing a can body manufactured according to the present invention, and FIG. 10a is a line X-XK? '65 sectional view. 1α, 1b, Ic sector blank 2
Adhesive tapes 3α, 3b Score 4 Tongues 5α, 5b, 5c Cut portions 6α, 6b Shearing device 7 Tongue bending die 8 Bending die 9 Bending die 10 Can body 11 of the present invention Middle plate strip 11a
Front side 11b Back side 12α, 12b Manpower 13α, 13/! ' Heating devices 14α, 14
b Heart portion 15 truncated pyramidal horn 16 forming wing member 16α, 16b wing half-rest 17 pin 18 hammer 19 anvil 20α, 20b cooling mechanism 21α, 21b connecting pin 22α, 22b plumket 23α, 23b
Rotating arm 24 Molding space 25 Longitudinal groove 26 Blank edge 30
Forming and bumping mechanism\ze? Mr. To continued 7 City City, Su■ (Japanese 6I year 6J14 Special 111 Office Tono 1, 4G indication patent 11i1! J61-60587 No.-2, Title of invention Can body and its manufacturing method 3, Person making amendment・Relationship with 11 cases Patent applicant Address 1-3-1 Uchisaiwai-cho, Chiyoda-ku, Tokyo Name 376 Toyo Seikan Co., Ltd. 4, Agent 6, Number of inventions to be increased by amendment None 7, Subject of amendment Drawing 8, content of amendment Although Figure 1a was drawn on the drawings at the time of filing, the number 1, ``Figure 1a'' was missing.

Claims (2)

[Claims] (1) A winding tongue formed integrally with the outer edge of the lap seam on the can body, and at least two strips extending from the base of the tongue around the entire circumference of the can body. 1. A can body having a truncated pyramidal shape and having a score, the inner and outer edge portions forming the lap seam being adhered with a thermoplastic adhesive. (2) a wrap seam bonded with a thermoplastic adhesive, a winding tongue integral with the outer edge, and extending from the base of the tongue around the entire circumference of the can body; A method for producing a can body having at least two scores, which comprises: pasting adhesive tape to one side edge of a metal plate of a prescribed width, and then attaching adhesive tape to one end of each. A method for manufacturing a can body comprising the steps of punching out a large number of fan-shaped blanks from the metal plate and heat-bonding the individual fan-shaped blanks on which the tongue pieces and scores have been formed using a forming and bumping mechanism.