JPH0747341Y2 - Canned with cover film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an ordinary canned food and a canned food in which beverage cans such as canned beer and canned juice are fitted with a cover film for hygiene.

[Prior Art] In general, canned goods consist of a can body, a can lid, and a can bottom. The can body and the can lid are rolled by rolling the side edges of the can lid around the upper edge of the can body. The fastening convex portion is formed on the upper side surface of the can and joined.

When opening this, cut the lid on the inside of the convex portion by winding with a can opener, or open a beverage can such as beer or juice has a pull top structure with a metal ring attached to the canopy. Lift the ring with your finger to open it.

In this case, when the can is opened, the contents overflow on the can lid, or after opening the can, the mouth of the can is directly attached to the can.
The can lid and the side surface around the top of the can are often contaminated during the distribution process, which is not hygienic.

Even if there is no such contamination, consumers do not know what kind of contamination the can lid receives until the food or drink is removed from the can after it is manufactured. , There is a drawback that makes you feel uneasy when drinking.

In the above-mentioned canned food, it is sanitary to cover the can lid and the upper edge portion thereof just before drinking, and remove the contents to take out the contents.

As such a sanitary cover for cans, a plastic thick cap is already used for a small part of the cans. This is simply covered with a thick sheet plastic lid that fits into the winding convex portion on the periphery of the can lid.

However, since such a lid can be freely attached and detached, there is a drawback that the consumer cannot confirm that there is no contamination.

Also, depending on the type of canned food, for example, canned beer, canned juice, and canned bean paste can be opened after being immersed in cooling water.

In this case, there is a drawback that the space between the film of the can lid and the can lid is not airtight, and when immersed in water as it is, it is contaminated with cooling water.

Moreover, this lid uses a lot of plastic raw materials and is not resource-saving.

[Problems to be Solved by the Invention] An object of the present invention is to provide a canned product with a cover film, which is simple and hygienic, can be immersed in water and cooled, and can be applied to the conventional sales and distribution form without hindrance. It is what

[Means for Solving the Problems] In order to solve the above problems, the present inventor presumes that a thin film cover is used from the viewpoint of convenience, and the film is provided with an adhesive heat-shrinkable film. It was found that the airtightness of the space of the lid can be maintained if this film is adhered with an adhesive around the entire apex of the convex portion of the canned lid around the can lid of a can, and the present invention is made. Came to.

That is, according to the present invention, in a canned product in which the can lid surface and the upper peripheral side surface of the canned product are covered with a heat-shrinkable plastic film with a heat-sensitive adhesive, the cover film is heated to the apex of the winding convex portion on the peripheral edge of the can lid. The cover film is adhered to the apex by a heat-sensitive adhesive on the inner surface of the cover film, and the peripheral edge of the cover film is heated with hot air or radiant heat to shrink the peripheral edge around the entire upper peripheral side surface of the can. And a canned film with a cover film, which is adhered to the upper part of the can with a heat-sensitive adhesive on the inner surface of the cover film, and a cover film in which the top cover film portion of the canned cover film is concave in conformity with the lid surface of the can. It is intended to provide canned food with film.

Any material can be used as the material of the film used in the present invention as long as it is a thermoplastic resin. For example, vinyl chloride resin, polyethylene, polypropylene,
A heat-shrinkable film having a heat shrinkage rate of 15% or more, preferably 30% or more, such as polystyrene, poly (ethylene terephthalate), polybutylene terephthalate, or polyamide, can be used.

In the case of the present invention, it is more preferable to use a heat-shrinkable film produced by biaxial stretching because there is no anisotropy in heat shrinkage.

The thickness of the film used in the present invention is not particularly limited,
Usually, about 10 to 200 μm can be used.

When the thickness of the film is less than 10 μ, the film has no strength, and when it exceeds 200 μ, heat shrinkage is difficult to occur.

The heat-sensitive adhesive applied to the cover film of the present invention may be any one that heat-bonds the plastic film and the metal. For example, in addition to a commercially available adhesive, a polymer film having a low softening point may be laminated to form an adhesive.

Since the heat-sensitive adhesive used in the present invention is not tacky at room temperature, it has an advantage that the covering operation of the cover film is easy.

Examples of heat-sensitive adhesives include ethylene-vinyl acetate copolymer-based adhesives, copolymerized polyester-based adhesives, polyamide-based adhesives, atactic polypropylene adhesives, ethylene-ethyl acrylate copolymer-based adhesives, polyurethane-based adhesives. Agents and tackifiers such as petroleum resins, rosins, and pinene resins can be preferably used.

When these heat-sensitive adhesives are used, the pressure-bonding plate can be heated to melt and cool the heat-sensitive adhesive, and then the pressure-bonding plate can be removed to complete the bonding.

In order to produce the canned product with the cover film of the present invention, for example, the can lid is cleaned, and the band of the heat-shrinkable film coated with the heat-sensitive adhesive is continuously fed before the continuous supply. Then, the film is placed on the can, the plate is strongly pressed from above, and the film is firmly fixed to the winding convex portion on the peripheral edge of the can lid, and the film is bonded with a heat-sensitive adhesive. Then, the film is cut with a diameter of about 5 to 40 mm protruding from the lid portion of the can, and the protruding portion is heat-shrinked by hot air or radiant heat, and the film is attached to the side surface of the upper can to attach the cover film of the present invention. Canned food is completed.

At this time, if a soft crimping plate is used to bond the winding convex portion, a considerably wide width, for example, a width of 2 to 4 mm, is applied at the apex of the winding convex portion. can get.

[Operation] In the canned product with the cover film of the present invention, the film and the winding convex portion around the lid of the canned product are very well adhered by pressure bonding.

For this reason, the watertightness of the space above the can lid is increased.

The film on the side surface of the upper can serves to fix the cover film to the can, and by the action of the heat-sensitive adhesive applied to the can, the film is bonded and fixed to the can surface and the once contracted films are bonded, It has the effect of preventing the tightening force from loosening.

However, the film on the side surface of the upper can is tightened by only a weak tightening force as compared with the pressure of the above-mentioned pressure-bonding plate for heat shrinkage, and this part has film wrinkles at the time of shrinkage, so the point of water tightness is However, it is not possible to completely block the water on this side.

Further, the cover film is annealed by heating the cover film to a temperature below the melting point while fixing the periphery of the cover film by a crimping plate so that the film on the cover lid does not shrink due to heat. Then, the degree of molecular orientation of the film in the lid portion is reduced, the impact resistance is improved, and the film is less likely to be torn.

This annealing process is beneficial because the film in this part is usually floated on the can lid and is easily hit by an object so that the film is easily torn.

Embodiments The present invention will be described in more detail with reference to the drawings of the embodiments.

The canned goods with a cover film of the embodiment shown in FIGS. 1 and 2 have a cover film 4 made of a biaxially stretched heat-shrinkable film, which is firmly attached to the convex portion 3 around the can lid of the canned goods by a heat-sensitive adhesive. Is glued to. Adhesion of the cover film to the ring of the winding convex portion is performed by pressing a heated plate onto the winding convex portion from above the film.

The feature of the present invention is that there is no limitation in terms of bonding conditions because the pressure and the heating can be made uniform in the pressure bonding operation of the cover film to the winding convex portion ring, and the type of film used and the heat-sensitive adhesive can be selected. It is at the discretion that it is possible to obtain a very strong bond, i.e. perfect airtightness.

That is, if a film having a high melting point is selected, it is possible to freely select a heat-sensitive adhesive having a high adhesiveness between the metal and the film.

For example, a thermoplastic film having a low melting point can be laminated and used as an adhesive, and the thickness of the adhesive layer can be increased.

As such a specific example, for example, a laminate of an acid-modified polypropylene resin film on a polyamide resin film, or a combination of a polyester resin film or a vinyl chloride resin with an ethylene vinyl acetate copolymer-based thermal adhesive can be used particularly preferably. Is.

However, if the adhesion is too strong, when the film is peeled off, the film edge or the heat-sensitive adhesive may remain on the edge of the can to give a feeling of uncleanness. Therefore, it is preferable to select an appropriate one.

The film protruding laterally from the lid is heat-shrinked by heating and is tightly attached to the upper side surface of the can.

The cover portion of the cover film is annealed at the same time as the covering process, and the impact resistance is increased.

FIG. 3 and FIG. 4 show the cover film in which the lid portion has a concave shape like a drop lid, and in other respects it is the same as the embodiment of FIG.

The shape of the cover film used here is, for example,
A circular lid in the center as shown in Figures and 6
A narrow groove ring 14 is provided on the periphery of 13 and a convex ring 12 is continuously provided on the outer side of the ring of the groove portion 14, and the heat shrinkage rate of the raw material film is substantially maintained on the outer side thereof. A brim-shaped portion 11 is provided.

When the cover film is used for a beer can, for example, as shown in FIGS. 3 and 4, the cover film is placed on the cover of the can, and the convex ring 12 of the cover film is used to wrap the cover film around the can. The ring-shaped part is fitted, and heat and pressure are applied to the ring-shaped convex-shaped ring of the canned product from above to crimp it, and then heat is applied to the brim-shaped part and the convex ring outer side surface B with hot air or infrared rays. The film cap is heat-shrinked and the film cap is fixed to the upper lid of the can by the tightening force.

Since the inside of the cover film is concave in this way, it is convenient for stacking beer cans in a stack, and since there is no distance from the can lid, there is no danger of tearing even without annealing. There is.

Then, when drinking beer, the film cap can be easily removed by holding and peeling the knob piece 15.

The once removed film cap can no longer be covered and fixed again.

[Effect of the Invention] The canned product with a cover film of the present invention can seal the opening of a beer can or the like just before the opening, and once opened, it cannot be fixed again by covering it with the film cap. The consumer can identify whether the film cap is opened or not, and can confirm the presence or absence of contamination, which has an advantage of giving a sense of security.

The canned food with cover film of the present invention is thermocompression-bonded between the film and the can lid at the apex of the convex ribs around the top of the canned food to maintain airtightness, so the canned food of the present invention is cooled by immersing it in ice water. However, water does not enter the space between the can lid and the cover film.

The presence of such infiltrating water may make the consumer feel unclean, but in the case of the present invention, there is an advantage that this fear does not occur.

The canned food of the present invention is convenient because the cover film can be removed simply by peeling off the knob piece when the contents are taken out, and the can lid can be opened by opening the can with the cover film attached.

[Brief description of drawings]

FIG. 1 is a sectional view of a beverage can with a cover film according to an embodiment of the present invention, FIG. 2 is a perspective view thereof, and FIG.
FIG. 4 is a cross-sectional view of a can beer which is an embodiment of another aspect of the present invention, FIG. 4 is a perspective view thereof, and FIGS. 5 and 6 are plan views showing a structure of an example cover film in the case of a can beer. It is a figure and a sectional view. Reference numerals in the figure are 1; can, 2; can lid, 3; can lid peripheral winding tightening convex portion, 4; heat shrinkable film cover film with adhesive,
5; cover film lid, 6; cover film shrinkage,
7; Adhesive part to cover winding convex portion of cover film, 8; Unsealing ring, 9; Can bottom, 10; Can body, 11; Skirt portion of can beer cover film, 12; Convex shape of can beer cover film Ring part, 13; Inner lid part of cover film for canned beer, 14; Groove part of cover film for canned beer, 15; Knob piece, A; Inner side surface of convex ring, B; Convex ring outer side surface, C; Heat It is a shrinkable collar.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 49-64368 (JP, U) Steady 47-22062 (JP, U) Steady 61-32044 (JP, U) Steady Sho 49- 144647 (JP, U) Actually open 60-38245 (JP, U) Actually open 48-87262 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A canned product in which a can lid surface and a peripheral side surface of an upper portion of the can are covered with a heat-shrinkable plastic film with a heat-sensitive adhesive, and the cover film is thermocompression bonded to the apex of a winding convex portion on the peripheral edge of the can lid. By adhering to the apex with a heat-sensitive adhesive on the inner surface of the cover film, and heating the peripheral edge of the cover film with hot air or radiant heat to shrink the peripheral edge over the entire peripheral side surface of the upper part of the can. A canned product with a cover film, which is adhered to the upper part of the canned product by a heat-sensitive adhesive on the inner surface of the cover film. 2. The can with a cover film according to claim 1, wherein the upper lid film portion of the cover film is concave so as to match the lid surface of the can.