JPS63203314A - Manufacture of can barrel - Google Patents

Abstract

PURPOSE:To enable a laminated blank to be continuously produced from a metallic foil web by a method in which after score parts are cut off, the parts of narrow width are removed, and a plastic web is slitted in the longitudinal direction by a prescribed width, and further, while cutting said web into the length equal to the height of a can barrel, the laminated blank is formed. CONSTITUTION:A metallic foil web 9 in which a score part 8 is formed, is stuck by heat to the surface of a plastic web 19 of a laminated web 20 on one side which is sent through a guide roll 21 by a heat adhesion roll device 24, whereby a laminated web 29 is formed. The laminated web 29 passes a guide roll 31, where it is bent into a horizontal movement, then the score parts 8 and 10 are teared off at the position where it comes out from a pinch roll 32, and the parts 14 and 28 of narrow width are removed. Next, after the web has been slitted by a slitter 33 along the surface 30 passing the opposite side ends 13a, 27a, it is cut into a length equal to the height of a can barrel by a cutter 34, and thus a laminated blank 5 is manufactured.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is characterized in that the inner and outer layers are made of metal foil and the center layer is made of thermoplastic plastic, which has perforation resistance, buckling resistance, hygiene, and gas barrier properties. This invention relates to a method for producing a can body having excellent container performance.

(Prior Art) The present inventors previously disclosed in Japanese Utility Model Publication No. 60-28587 that the inner and outer layers are made of metal foil and the center layer is made of thermoplastic plastic film. A can body formed by overlapping the opposing edge portions of blank plates with the center layer exposed on different faces of the edge portions and heat-sealing the exposed portions of the center layer to form a side joint portion. It was shown that the container has excellent properties such as puncture resistance, buckling resistance, hygiene, and gas barrier properties.

As a method for manufacturing the above-mentioned blank sheet, first, a first metal foil sheet is placed on one side of a thermoplastic glass web at a constant interval X (equal to the overlapping width) using an adhesive roll having a large number of vacuum suction holes. and then thermally bond the second metal foil sheet to the other surface of the web by shifting it by a fixed distance X from the opposing first metal foil sheet using an adhesive roll similar to the above. The above-mentioned publication proposed a method of forming a laminated web by using the above method and cutting the laminated web to the dimensions of the blank plate.

However, in this method, the metal foil web is first cut into metal foil sheets of a predetermined size, and the metal foil sheets are thermally bonded to the plastic web using an adhesive roll having a large number of vacuum suction holes, and the resulting laminate is Since the web is further cut into the dimensions of the blank, the process and equipment become complicated, and there are problems in that productivity is low.

(Problems to be Solved by the Invention) The present invention relates to a method for manufacturing a can body in which the inner and outer layers are made of metal foil and the center layer is made of thermoplastic plastic. An object of the present invention is to provide a method for producing the can body described above, which can form a blank plate (laminate blank) using relatively simple steps and equipment with relatively high productivity.

(Means for Solving the Problems) In the method for manufacturing a can body of the present invention, the inner and outer layers are made of metal foil, the center layer is made of thermoplastic plastic, and the can body is formed by overlapping and thermally fusing the thermoplastic plastic. In a method for manufacturing a can body having a side joint portion, the first metal foil web includes:
longitudinally such that a plurality of first wide portions having a width substantially equal to the circumference of the can body and a plurality of first narrow portions having a width substantially equal to the width of the side joint portion alternate; forming a score portion on the thermoplastic web, bonding only the first wide portion to the first side of the thermoplastic web;
a plurality of second wide portions and a plurality of second narrow portions having widths equal to the wide portions and first narrow portions of the plastic web, respectively, alternately, and A score portion is formed in the longitudinal direction so that the side edge on the first side side faces the side edge on the second side side of the plastic web of the first wide portion, and a laminate web by adhering only the score portion to the second side of the plastic web, and then cutting the score portion to remove the first narrow portion and the second narrow portion, and bonding the score portion to the second side of the plastic web. a laminate blank by slitting the tube along the opposing side edges and cutting it to a length equal to the height of the can body; narrow part and second
The exposed portions of the thermoplastic glass corresponding to the narrow width portions are overlapped and thermally fused (hereinafter referred to as the first invention).

Further, in the method for manufacturing a can body of the present invention, the inner and outer layers are made of metal foil,
The center layer is made of thermoplastic.

In the method for manufacturing a can body having a side joint formed by overlapping and heat-sealing thermoplastic plastics, the first
a metal foil web alternating with first elongated sections of length substantially equal to the circumference of the can body and first short sections of length substantially equal to the width of the side joint. forming a score portion extending in the width direction defining a first long portion and a first short portion, and bonding only the first long portion to the first surface of the thermoplastic plastic web. , to the second metal foil web;
The second long part and the second short part each having the same length as the first long part and the first short part alternate, and the front end of the second long part is A second elongated portion and a second elongated portion are arranged opposite to the rear end of the first elongated portion.
forming a score portion extending in the width direction defining a short portion of the
Only the second elongate portion is adhered to the second side of the thermoplastic web to form a laminate web, and the score portion is then cut to remove all of the first and second short portions. , slitting the plastic web to a width equal to the height of the can body and cutting across the opposite ends to form a laminate blank; The exposed thermoplastic plastic parts corresponding to the first short part and the second short part are overlapped and thermally fused (hereinafter referred to as the second invention).

(Function) In the case of the first invention, score portions are formed in the longitudinal direction of the metal foil web by alternating a plurality of wide width portions and a plurality of narrow width portions,
Only the wide part is adhered to both sides of a thermoplastic web to form a laminate web, and then the score part is cut off to remove the narrow part, the plastic web is slit longitudinally to a predetermined width, and the can body is cut out. Since the laminate blanks are formed by cutting them into lengths equal to the height of can get.

The width of the wide portion of the metal foil is substantially equal to the circumference of the can body, and the width of the narrow portion is substantially equal to the width of the side joint of the can body, and is adhered to one side of the plastic web. The left (left) side edge of the wide part is glued to the other side.
Since the laminate web is slit opposite the side edge of the right side, and the narrow portion is removed, the opposite edge of the resulting laminate blank is slit along the opposite side edge. In this case, a thermoplastic plastic plate is exposed on different sides with a width of one side joint. By overlapping and heat-sealing the exposed portions of the opposing edges, a can body having side joints can be manufactured.

In the case of the second invention, score portions extending in the width direction are formed on the metal foil web such that long portions and short portions alternate, and only the long portions are bonded to both sides of the thermoplastic web to create a laminate web. After that, the score part is cut off, the short part is removed, and the plastic web is slit to a width equal to the height of the can body, and cut to a predetermined length to form a laminate blank. Substantially continuous production of foil-ebbing laminate blanks is possible, the process and equipment are relatively simple, and relatively high productivity can be obtained.

the length of the elongated portion of the metal foil is substantially equal to the circumference of the can body;
Further, the length of the short portion is substantially equal to the width of the side joint of the can body, and the front end of the long portion bonded to one side of the plastic web is bonded to the other side. A laminate web is formed opposite the rear end of the section, the score section is then cut away to remove the short sections, the plastic web is slit to a width equal to the height of the can body, and the Since the laminate blank is cut along opposite edges, the opposite edges of the laminate blank have thermoplastic gelastec exposed on different sides with the width of the side joints. . By overlapping and heat-sealing the exposed portions of the opposing edges, a can body having side joints can be manufactured.

(Example) In FIG. 1, 1 is a can body, and the outer layer 2 and inner layer 3 are made of metal foil, and the center layer 4 is made of thermoplastic plastic. Reference numeral 5 in FIG. 2 shows a longitudinal cross-sectional view of a laminated body blank for manufacturing the can body l.
The constant width X (overlapping width) of a is not covered by the metal foil of the inner layer 3, and the constant @X of the edge portion 5b is not covered by the metal foil of the outer layer 2, and both are centered The thermoplastic silastic of layer 4 is exposed.

The can body l is formed by rolling up the blank 5 and has an edge portion 5a.

5b are stacked so that the exposed portions of the center layer 4 are in contact with each other, and the edge portions 5a and 5b are heated using a heat bar or high-frequency induction heating method, and the center layer 4 of the waist region is heated.
is melted or softened, then pressurized and rapidly cooled to form the side joint portion 6 by a so-called heat fusion method.

As the metal foil forming the outer layer 2 and the inner layer 3, iron foil, steel foil, bushy foil, tin-free steel foil, aluminum alloy foil, etc. having a thickness of about 10 to 100 μm are preferably used. The thermoplastic glass forming the center layer 4 includes stretched or unstretched polyethylene, polypropylene, polyamide, linear polyester, polycargonate, etc. with a thickness of approximately 50 to 300 μm, and materials to which fillers are added. etc. are preferably used. Preferably, the thickness of the blank 5 is approximately 100-500 μm.

FIG. M3 shows an example of a manufacturing apparatus for the laminate blank 5 in the first invention.

Reference numeral 11 denotes a web of metal foil that is to become the inner layer 3, and the upper surface of the figure is coated with an adhesive layer 7 (e.g., epoxy/phenol-based, urethane-based, maleic anhydride-modified polyolefin, polyamide-based, acrylic acid-modified ethylene vinyl acetate). copolymer (Fig. 5; not shown in Fig. 4) is coated with a wide width portion 13 (described later) by an adhesive coating/drying device (not shown).
It is formed intermittently in the width direction except for the part that should become the narrow width part 14, and a corrosion-resistant baked coating (for example, epoxy/phenol-based, etc.; not shown) is applied to the lower surface. uniformly formed.

Among the above combinations, a first example that is preferable (especially from an industrial cost perspective) is a combination of aluminum foil, a maleic anhydride-modified polypropylene adhesive, and polypropylene, and a second example that is also preferable is a combination of aluminum foil, a maleic anhydride-modified polypropylene adhesive, and polypropylene. There is a combination of foil (or tin-free steel foil), epoxy phenolic adhesive, and nylon 12.

The adhesion strength of the film to the metal foil is sufficient as long as it does not cause peeling between the two materials during the subsequent can body manufacturing process and processing process, and is 200% in the T-shaped beer measurement.
,! i'15mm or more would be fine.

12 is a score forming roll device, as shown in FIGS. 4 and 5, a wide part 13 having a width W substantially equal to the circumferential length of the can body 1, and an overlapping width, that is, a side joint part 6. The metal foil web 11 is provided with wide portions 13 and narrow portions 1 such that narrow portions 14 of width X substantially equal to the width alternate in the width direction.
4 is formed.

After forming the score 10, the metal foil web 11 descends around a pinch roll 15 comprising a lower roll 15& and an upper roll 15b and passes through a thermal bonding roll device 16 to one side of the thermoplastic web 19. Wide part 13
The single-sided laminated web 20 shown in FIG. 6 is formed by thermal bonding at only one side. The thermal adhesive roll device includes a heating roll 17 with a built-in heater and a presser roll 18 lined with elastic rubber (not shown).

22 and 23 are score-forming roll devices and pinch rolls of similar construction to 12 and 15, respectively;
Further, 24 is a thermal adhesive roll device having the same structure as 16, 25 is a heating roll, and 26 is a presser roll. Reference numeral 9 denotes a web of gold R foil that is to become the outer surface layer 2, with an adhesive layer (not shown) on the upper surface, and a part that is to become the narrow width part 28 only in the part that will become the wide part 27 (described later). A printed film is usually formed on the lower surface.

The metal foil web 9 is formed by a score forming roll device 22 into score portions 8 (which define wide portions 27 and narrow portions 28 ) such that wide portions 27 having a width W and narrow portions 28 having a width X alternate.
Figure 7) is formed. And the formation of the score section 8 is as follows:
As shown in FIG. 7, the side end 27a of the plastic web 19 of the wide portion 27 on the first side 19a side
This is done so as to face the side end 13a of the plastic web 19 on the second side 19b side.

The metal foil web 9 on which the score portion 8 has been formed is thermally bonded to the surface of the plastic web 19 of the single-sided laminated web 20 fed through the guide roll 21 by a thermal bonding roll device 24, so that the laminate web 29 is formed. It is formed. As the laminate web 29 is bent and transitioned horizontally through the guide rolls 31, upon exiting the pinch rolls 32, the score portions 8 and 10 are torn and cut to remove the narrow portions 14 and 28. Then, after being slit by a slitter 33 along a plane 30 that passes through the opposing side edges 13a and 27a, it is cut into a length equal to the height of the can body 1 by a cutter 34 to produce a laminate blank 5. Ru. Note that since the narrow width portion 14 is not coated with adhesive in advance, it is easily removed.

Note that instead of forming an adhesive layer on the metal foil webs 9 and 11, adhesive layers may be formed on both sides of the plastic web 19 at positions corresponding to the wide portions 13 and 27. 11 more
may be a web of metal foil to be the outer layer 2, and 9 may be a web of metal foil to be the inner layer 3.

FIG. 8 shows an example of a manufacturing apparatus for the laminate blank 5 according to the second invention, and parts having the same reference numerals as those in FIG. 3 indicate similar parts.

111 is a web of metal foil to become the inner layer 3,
An adhesive layer (not shown) is applied to the upper surface of the figure by an adhesive coating and drying device (not shown) only on the portion that will become the long portion 113 (described later) and intermittently in the longitudinal direction except for the portion that will become the short portion 114. A corrosion-resistant baked coating is uniformly formed on the lower surface.

112 is a score forming roll device having a blade 112a, and as shown in FIGS. 9 and 10, the can body l
Long parts 113 of length W substantially equal to the circumference of the metal foil web 111 and short parts 114 of length X substantially equal to the overlapping width alternate in the longitudinal direction. 11
3 and a score section 110 defining a short section 114.

After forming the score portion 110, the metal foil web 111 moves down around the pinch rolls 15, passes through a thermal bonding roll device 16, and thermally bonds only the elongated portion 113 to one side of the thermoplastic plastic web 19. As a result, a single-sided laminated web 120 shown in FIG. 11 is formed.

122 is a score forming roll device having a similar structure to 112. Reference numeral 109 denotes a web of metal foil that is to become the outer surface layer 2, and an adhesive layer is applied to the upper surface only in the part that will become the long part 127 (described later), and intermittently in the longitudinal direction except for the part that will become the short part 128. A printed film is usually formed on the lower surface.

The metal foil web 109 is formed by a score forming roll device 122 into score portions 108 (second portions) defining long portions 127 and short portions 128 such that long portions 127 of length W and short portions 128 of length X alternate. Figure 13) is formed. And the formation of the score section 108 is as shown in FIG.
The front end 127a of the elongated portion 127 faces the rear end 113a of the elongated portion 113.

The metal foil web 109 on which the score portion 108 is formed is thermally bonded to the surface of the silicone web 19 of the single-sided laminated web 120 by a thermal bonding roll device 24 to form a laminate web 129.
is formed. The laminate web 129 is slit along the dashed-dot line 131 (FIG. 12) by a slitter 33 to form a plurality of strips (three strips in the figure) of strips 132 having a width equal to the height of the can body l; Next, the cutter 34 cuts the surface 130 passing through the opposing ends 113a and 127at (FIG. 13).
The laminate blank 5 is cut along the laminate blank 5 to obtain a blank 5' having the same size as the laminate blank 5, and is then torn along the score portion 108° 110 and cut out to remove the short portions 114 and 128. is created.

Note that the metal foil web 109. Instead of forming an adhesive layer on the plastic web 190, the elongated portion 113 on both sides of the plastic web 190
, 127 may be formed with an adhesive layer.

Furthermore, 111 is a web of metal foil to become the outer layer 2;
09 may be 9 nibs of metal foil to serve as the inner surface layer 3. Also, before slitting with the slitter 33, the score section 1
The short sections 114.128 may be removed by cutting 08° 110.

(Effects of the Invention) The method for manufacturing a can body of the present invention, in which the inner and outer layers are made of metal foil and the center layer is made of thermoplastic plastic, is capable of manufacturing a laminate blank for producing the can body using relatively simple steps and equipment. This has the effect that it can be formed with relatively high productivity.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example of a can body manufactured by the method of the present invention;
2 is a longitudinal sectional view of a laminate blank used for manufacturing the can body of FIG. 1; FIG. 3 is an explanatory front view of a first example of an apparatus for manufacturing the laminate blank of FIG. 2; Figure 4 is the third
A vertical cross-sectional view along the line IV-IV in the figure, Figure 5 is v of Figure 3.
Figures 6 and 7 are side views taken from line -■, cross-sectional views taken along line ■-■ and line ■-■ in Figure 3, respectively.
The figure is an explanatory front view of the second example of the apparatus for producing the laminate blank shown in FIG. 2, FIG. 9 is a side view taken from the line ■-■ in FIG. 8, and FIG. 11 and 12 are longitudinal cross-sectional views taken along line X-X of FIG.
Cross-sectional view along line XI and line X1l-XII, 13th
The figure is a longitudinal sectional view taken along the line -XI in FIG. 12. l... Can body, 2... Outer layer, 3... Inner layer, 4...
... Center layer, 5... Laminate blank, 5a, 5b...
・Edge part, 6... Side joint part, 8.10... Score part, 9, 11... Metal foil cube, 13, 27...
Wide part, 13a. 27 a-- side end, l 4 , 28-... narrow width part, 1
6.24... Thermal adhesive roll device, 19... Thermoplastic web, 19a, 19b... Side part,
29... Laminate web, 108, 110... Score portion, 109° 111... Metal foil web, 113, 12
7... Long part, 113 a, 127 m, one end part, 114, 128... Short part, 129... Laminate web. Figure 1 Figure 2 Figure 4 Figure 5 Figure 6 Figure 7 Figure 11 Figure 12 Figure 13

Claims (2)

[Claims] (1) In a method for manufacturing a can body, the inner and outer layers are made of metal foil, the center layer is made of a thermoplastic plastic, and the can body has a side joint part formed by overlapping and heat-sealing the thermoplastic plastics, the first metal foil The web has alternating first wide sections having a width substantially equal to the circumference of the can body and first narrow sections having a width substantially equal to the width of the side joint. a first wide portion is bonded to the first side of the thermoplastic web, and a first wide portion and a first narrow portion are bonded to the first side of the thermoplastic web. the plurality of second wide parts and the plurality of second narrow parts each having the same width as the width part alternate;
The score portion is provided in the longitudinal direction so that the side edge of the wide part of the plastic web on the first side side faces the side edge of the first wide part of the plastic web on the second side side. forming a laminate web by bonding only the second wide portion to the second side of the plastic web, and then cutting the score portion to form the first narrow portion and the second narrow portion. removing the plastic web along the opposing side edges and cutting the plastic web to a length equal to the height of the can body to form a laminate blank; A method for producing a can body having a side joint, the method comprising overlapping and heat-sealing exposed portions of the thermoplastic plastic corresponding to the first narrow portion and the second narrow portion. . (2) In a method for manufacturing a can body, the inner and outer layers are made of metal foil, the center layer is made of thermoplastic plastic, and the can body has a side joint part formed by overlapping and heat-sealing the thermoplastic plastics, wherein the first metal foil such that the web has alternating first elongated sections of length substantially equal to the circumference of the can body and first short sections of length substantially equal to the width of the side joint; forming a widthwise extending score defining a first elongate portion and a first short portion; only the first elongate portion is adhered to the first side of the thermoplastic web; The metal foil web is provided with alternating second elongated portions and second short portions having lengths equal to the first elongated portion and the first short portion, respectively, and of the second elongated portion. A score portion extending in the width direction defining a second elongated portion and a second short portion is formed such that a front end thereof faces a rear end of the first elongated portion; bonding only the elongate portion to a second side of the thermoplastic web to form a laminate web;
Thereafter, the score portion is cut out to form a first short portion and a second short portion.
slitting the plastic web to a width equal to the height of the can body and cutting along the opposite ends to form a laminate blank; A can body having a side joint portion characterized in that exposed portions of the thermoplastic plastic corresponding to the first short portion and the second short portion of the end edge portion are overlapped and heat fused. Production method.