JP2843135B2 - Capping method for a container with a collar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to packaging of foods and the like, and uses a heat-shrinkable film (biaxially stretched film) to form a pleated shape in a container with a collar. It relates to a method of capping.

[Conventional technology]

Conventionally, in the food field, as a capping method similar to the capping mode of the present invention, a container is covered with a general film, and the container is wrapped and sealed under a brim with a string-like film or the like. Many products with a plastic string tied around the container are available on the market, but none of them are sealed with heat or the like, so they do not have a hermetic seal and are of a degree to prevent dust adhesion. The cost is high for materials that seal around.

Also, in order to make the product pleated, it is also necessary to enhance the product value in terms of design, including the problem of the image of the product. At present, pleated folds and the like are not evenly distributed, the pleated length is not constant around and the appearance is very poor, and furthermore, all of these are manual. It is expensive and expensive.

[Problems to be solved by the invention]

The purpose of the present invention is to cover the container with a heat-shrinkable film on a collar, the container collar portion, and capping by applying hot air to a part of the periphery of the collar back, the film below the container collar back, Pleated without heat shrink
To provide a capping method.

[Means for solving the problem]

The present invention uses a heat-shrinkable film to preform a film and cut the film at a predetermined portion outside the molded portion so that the film around the molded portion is creased, so that the film is fitted into a flanged container. Then, cover the container with the brim, apply the hot air of the film shrinkage temperature only to a part of the brim part of the brim and the back of the brim, and heat shrink the film. Capping the brim portion of the container and a part of the periphery of the brim back, while protecting the cooling with a shielding cooling plate that has a cooling means that can be kept at 50 ° C or less to shield from hot air, The film remaining in is not shrunk at all, it is characterized by pleating the film along the container body shape so as to fold from the fold,
This is a capping method for a container with a brim.

Generally, the heat-shrinkable film used in the present invention preferably has a thickness of about 40 to 50 μm from the viewpoint of processability, and the temperature of the hot-air outlet is desirably 120 to 130 ° C.

In the preforming of the film, only the portion to be formed, that is, the portion to become the opening of the container with a flange is preheated, and after the preheating, forming (such as vacuum forming) is performed. It is necessary to form the preheated portion under such conditions that the heat shrinkage remains sufficiently.

The fold processing is performed by pressing using an upper die and a lower die, and the cut is cut by a cutter wound around the outer periphery of the upper die. Pressing is performed simultaneously with the upper mold and the lower mold at the same time as the cutting to perform the crease processing. In this way, the fold-processed and cut molded cut lid is put on the flanged container. Next, the molded cut lid placed on the container with the collar is exposed to hot air only on the container top and the back of the container, clamping the following fold-shaped film to protect the cooling and cooling the container and part of the periphery of the collar. Then, the film is shrunk so as to be in close contact with the brim portion of the brim-equipped container and sealed, but below the back of the brim, the following is kept so as not to be thermally shrunk at all.

This method is a method for capping a container with a rim having a pleat shape below the rim of the container by such a method.

[Action]

The heat-shrinkable film is shaped into a container opening with a flange, and the preformed film is clamped around the formed film with a film clamp, and then the formed film is cut with a cutter wound on an upper mold. Press the film with the lower die corresponding to the upper die.

The upper mold and the lower mold have a groove-like uneven shape, and have a shape that can be folded by pressing. Next, the container is pushed up from below, and the container is pushed into the creased molded cut lid. In the next step, the flanged container covered with the molded cut lid is pushed up to bend by the bending guide, so that the folded portion of the folded molded cut lid is bent below the container flange.

Next, the top surface of the container is cooled down by a shielding cooling plate having cooling means capable of keeping the temperature below 50 ° C, and the fold-shaped film portion is clamped around the container body along the shape of the container by the shielding cooling plate from the container side. . By clamping, the film follows the container as if folded from the fold. Next, the blown film thermally shrinks and caps the blown film to a portion around the container brim portion and the back of the container brim by the hot air blow outlet. When the container body shielding cooling plate is opened after capping, the film below the back of the container brim is folded to have a pleated (pleated) shape. The pleated length has a good appearance when the length is about 1/3 of the container diameter. The shape and number of the concave and convex portions of the upper and lower molds are appropriately selected according to the shape of the container.

The shielding plate for clamping under the container brim is preferably divided into two or four, depending on the shape of the container.

Next, what was implemented using a circular container as a container with a brim will be described in detail with reference to the drawings.

More specifically, referring to the drawing of FIG. 1, the molded film 2 is placed at the center of the flanged container 1 and the film clamp 8 clamps the periphery of the molded film 2 on the lower mold 4 by the extension action of the air cylinder 9. Then, the formed film 2 is cut by the cutter 7 wound around the upper mold 5 by the extension action of the air cylinder 11, and at the same time, the lower mold 4 and the upper mold 5 clamp the outer periphery of the formed portion of the formed film 2. As a result, a molded cut lid obtained by folding as shown in FIG. 2 is obtained.

Next, by the extension action of the air cylinder 10, the flanged container 1 is pushed into the molding portion of the molded cut lid 3 and the molded cut lid is covered.

The next step will be described with reference to the drawing of FIG. 4. When the molded cut lid 3 is put on the flanged container 1, an air cylinder
When pushing up the container 1 with a collar by the extension action of 16,
The fold-shaped film portion of the molded cut lid 3 hits the bending guide 12, and the film is bent downward,
The top surface of the container 1 with the flange hits the shielding cooling plate 15, and the top surface of the container is shielded and cooled by hot air. Next, the shielding cooling plate 13 clamps the lower part of the back of the container flange of the container 1 with the flange along the shape of the container along with the folded film by the extension action of the air cylinder 17 to shield the hot air, and then the hot air outlet.
From FIG. 14, hot air is blown to a part of the periphery of the container brim and the back of the container brim, and only a part of the periphery of the container brim and the back of the brim occur, and capping is performed.

When the shielding cooling plate 13 is clamped, the folded film follows the shape of the container body so that the film is folded from the fold.

When the shielding cooling plate 13 is opened, the film is folded and formed into a pleated shape.

Next, FIG. 2 illustrates the molded cut lid 3, which is formed by a preformed film and a fold-shaped film.

Next, FIG. 3 illustrates the upper mold 22 and the lower mold 24.
It explains the shapes of an upper mold and a lower mold that form a fold shape on a film.

Next, FIG. 5 illustrates a capping mode of a container with a collar.

〔The invention's effect〕

According to the method of the present invention, the virgin sealability is good, it can be opened at any position, and the shape of the container is not limited, and it can be used for various kinds of containers. The uneven length of the pleated shape has been improved, the pleated folds have been evened around, and not only the appearance with high overall commercial value has been obtained and the quality has been improved. The production efficiency can be increased and the cost can be reduced without sealing.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show schematic views according to the present invention. FIG. 1 is a cutaway sectional view for explaining a cut section of a molded film, FIG. 2 is a perspective view for explaining a molded cut lid, FIG. FIG. 4 is a cutaway sectional view for explaining a capping portion, and FIG. 5 is a perspective view for explaining capping of a container with a collar.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B65B 7/00-7/28 B65B 53/00-53/06 B65D 41/62

Claims (1)

(57) [Claims] 1. A heat-shrinkable film is preformed so that it can be fitted into an opening of a container with a brim, a predetermined width is provided from an outer peripheral edge of the formed portion, and the heat-shrinkable film is cut. At the same time, forming a molded cut lid with a concave and convex fold from the outer peripheral edge formed radially, and covering the molded cut lid over the opening of the flanged container,
The outer peripheral edge of the brim portion of the container opening is folded from the fold to conform to the shape of the container, and has a pleated (folded) shape. The container opening (container top surface) and the lower portion of the container brim are exposed to hot air. A capping method for a container with a brim, characterized in that hot air is blown only to the periphery of the brim portion of the container to cause heat shrinkage while cooling and protecting with a shielding cooling plate that can be kept at 50 ° C or less for shielding.