JPH0620895B2 - How to attach a heat-shrinkable film to a container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method of mounting a film such as a label on a container such as a bottle or a can.

[Conventional technology]

Attach a heat-shrinkable synthetic resin film with a trademark, a pattern, etc. to the body of a container such as a bottle or can, and use this as a label, or a label / container protective film, and in the case of a bottle, It has been widely practiced in the past to cover the periphery of the stopper at the bottle mouth with a part of the film so as to also serve as a cap seal.

As a method of mounting a heat-shrinkable film (hereinafter, “film”) on a container, the film is formed into a tube shape in advance, and after it is fitted around the container, heat-shrinking treatment such as hot air blowing is performed. The method of applying and adhering to the surface of the container has been widely used in the past. However, in this method, a tube (which is usually folded and supplied flatly for convenience of storage and transportation) is fitted into the container. When it is inserted, it requires a relatively difficult and cumbersome operation for expanding the tube from a flatly folded state into a tubular shape, and there is a problem that the tube is likely to be bent or turned over while the tube is being inserted into the container.

Instead of the above method of fitting the film tube into the container,
Wrap the film around the surface of the container and overlap the front edge and the rear edge of the film, join the overlapping surfaces to form a tube, and heat-shrink it to bring it into close contact with the container surface. Thus, the above-mentioned difficulties can be solved, and at the same time, the step of molding the tube and the step of fitting the tube into the container can be achieved simultaneously as one step on the surface of the container, reducing the number of steps. , Productivity is improved. A method shown in FIG. 8 has been proposed as a method for mounting the film (Japanese Patent Laid-Open No. 60-158025). FIG. 9 shows a film winding step according to the same method. In the figure, (15
(0) is a rotary drum having a vacuum suction hole (151),
0) is a container holder. The container (B) is held by the holding table (160) and substantially abuts on the peripheral surface of the rotary drum (150), and the supporting table (16)
Due to the rotation of (0), the rotating drum (150) is rotating at a peripheral speed equal to the peripheral speed. The film (F) is fed from the film supply roller (170), is fed through the guide roller (180) between the rotary drum (150) and the pressing roller (190) abutting on the peripheral surface thereof, and is fed to the rotary drum (150). ) Is adsorbed and held (FIG. 9 [I]). The film (F) adsorbed and held on the rotating drum (150) is transferred toward the container (B) as the rotating drum (150) rotates, and the front edge portion (F1) of the film (F) is moved to the container (B). When reaching the position of contacting the side surface of B), the front end edge portion (F1) adheres to the side surface of the container (B) by the adhesive force of the adhesive applied to that portion in advance. Front edge
The film (F) having (F1) adhered to the surface of the container (B) is wound around the container (B) while being peeled off from the peripheral surface of the rotating drum (150) as the container (B) rotates. (Fig. 9 [II]). When the container (B) makes one revolution and returns to the position where the front edge (F1) of the film overlaps the rear edge (F2), the front edge (F1) and the rear edge (F2) are overlapped. Are joined (Fig. 9 [III]). The film (F) wound up in the container is then subjected to heat shrinkage treatment.

[Problems to be solved by the invention]

In the above film mounting method, when the container (B) has a columnar shape having a uniform cross-sectional diameter from the lower part to the upper part, the film can be easily wound around it. However, it is extremely difficult to successfully wrap the film around an irregularly shaped container, such as a gourd-shaped container, a drum-shaped container, or a polished container, which has a recessed portion or a bulged portion and whose sectional diameter changes partially. . That is, unlike the case of the cylindrical container, as shown in FIG. 10, when the film (F) is wound around the irregularly shaped container (B), the container (B) is rotated around the peripheral surface of the rotating drum (150). It is only the bulging part (B1) that the front end edge part (F1) of the film (F) on the rotary drum (150) can be adhered to the container (B) substantially by contacting with the container (B1). Since the engagement state of the film with respect to (B) is extremely unstable, the film is liable to roll over or turn over during winding, and in some cases, the adhesive portion (a) peels off and falls off the container surface. Even if the film (F) can be successfully wrapped around the container, it is not easy to join the overlapping surfaces of the front edge (F1) and the rear edge (F2) of the film (F). . In the case of a cylindrical container, the entire superposed surfaces can be joined by pressing the superposed front end edge (F1) and rear end edge (F2) from the outside to the side surface of the container (B). However, in the case of an irregularly shaped container, only the part facing the bulging part can be pressed and joined to the container, and the overlap is located in the part where there is a gap between the film (F) and the container (B). This is because the mating surfaces cannot be joined.

The present invention provides a film mounting method for solving the above problems.

[Means for solving problems]

In the film mounting method of the present invention, a container (B) in which a thin-walled cylindrical mandrel (10) having a vacuum suction surface extending in the axial direction on a part of its outer surface is held on a container holder (50). ), And the heat-shrinkable film (hereinafter,
"Film") (F) the front edge (F1) of the mandrel is sucked and held on the vacuum suction surface of the mandrel, the mandrel (10) suction-held the front edge (F1) of the film
The film is wound around the mandrel by rotating the film about one axis about its axis, and the rear edge (F2) of the film is suction-held on the vacuum suction surface of the mandrel and the front edge of the film is held. The process of superposing on the (F1), the film is formed by joining the superposed surfaces of the front edge (F1) and the rear edge (F2) of the film (F) wound around the mandrel (10). A step of forming into a tube, a step of extracting the mandrel (10) from between the film (F) formed into the tube and the container, and subjecting the film (F) to heat shrinkage treatment.

[Action]

According to the present invention, the film is adsorbed and held on the cylindrical mandrel (10) by a vacuum suction force, and is wound around the container by the rotation operation thereof. Therefore, it goes without saying that the container has a cylindrical shape. Even in the case of a container having a different shape, the film (F) does not fall off during the winding process and the winding process is not damaged.

Further, the film (F) wrapped by the rotation of the tubular mandrel (10) is backed up from the inside by the body circumferential surface of the tubular mandrel during the winding process, so that it is stable regardless of the shape of the container. It is kept in a tubular shape and does not turn over or turn over.

Further, after the film (F) is wound around the container by the tubular mandrel (10) making one round around the container, the front edge (F1) and the rear edge (F2) of the film (F) are overlapped. In the process of joining the mating surfaces, the cylindrical mandrel (10) serves as a backing plate, and by pressing the mating surface from the outside to the plate surface of the mandrel, regardless of the presence of irregularities on the container surface, the stacking is performed. The mating surfaces can be joined securely.

〔Example〕

An embodiment of the method of the present invention will be described with reference to FIGS. 1 to 5 show a film winding step using a tubular mandrel, FIG. 6 shows a heat shrinkage treatment step of a film, and FIG. 7 shows an example of a tubular mandrel.

The cylindrical mandrel (10) is a thin-walled cylindrical body having an appropriate inner diameter and body length, and two rows (11a) and (11b) of vacuum suction holes (11) are formed in a part of the outer surface of the cylindrical mandrel in the axial direction. Has a vacuum suction surface. The inside of the cylinder wall of the portion having the vacuum suction surface is hollow, and is connected to a vacuum suction system (not shown) so that the suction action of the vacuum suction surface is turned on / off.

The vacuum suction holes (11) are provided in two rows (11a) and (11b) because one row is the front edge (F1) of the film, the other row is the rear edge (F2) of the film. This is because they are adsorbed and held respectively.
The vacuum suction hole (11) may be formed as an elongated slit in the axial direction. The front edge of the film (F
In order to stabilize the adsorption holding state of 1) and the rear edge (F2),
In some cases, each vacuum suction hole row (11a) (11b) uses a mandrel formed as a group of two or more rows of vacuum suction holes (11). Also, the mandrel (1
In order to stabilize the rolled state of the film wound on (0), an auxiliary vacuum suction hole is provided, if desired, on a portion different from the vacuum suction surface, for example, on the outer surface opposite to the diameter direction thereof. In some cases

The cylindrical mandrel (10) is connected to an elevating / rotating drive mechanism (not shown), and is located at a position facing the side surface of the container (B) on the container holding table (50) and separated downward from the container (B). The elevating operation between the container (B) and the closed position is repeated, and the container (B) is rotated at a predetermined speed at a position facing the side surface of the container (B).

(70) is a film feeding device, and (60) is a film supply roller. The film feeding device (70) includes a rotating roll (71,
72) and a belt (73) stretched around it. The belt (73) has a film suction surface (for example, by vacuum suction force), sucks and holds the film (F) fed from the film supply roller (60), and holds the container holding table (50).
Feed towards upper container (B). Belts (73)
The suction action of the belt (73) so that the film (F) sucked and held by the sheet (F) is smoothly transferred from the surface of the belt (73) to the vessel (B) when the film (F) approaches the side surface of the vessel (B). Are stopped near the side surface of the container (B). A film cutting cutter (not shown) is arranged between the film supply roller (60) and the film supply device (70), and the film supply roller (60) extends the film supply device (70). The long film (F) supplied to (1) is cut into a predetermined length dimension according to the size of the container (B) and is fed to the container (B).

Reference numeral (80) is a film pressing device, and a pressing surface portion (81) protruding at the front end thereof has a built-in heater for heat-sealing the superposed surface of the film (F) wound around the container. The film pressing device (80) is connected to a slide mechanism (not shown), and moves back and forth with respect to the side surface of the container (B) at appropriate times.

In the above device, when the container (B) is placed and fixed on the container holder (50), the cylindrical mandrel (10) rises from below and stops at a position facing the side surface of the container (B). To do. At this time, the cylindrical mandrel (10) is connected to the vacuum suction hole row (11a, 11a).
b) is directed toward the belt (73) surface of the film feeding device (70). On the other hand, the film (F) wound around the container is adsorbed and held by the film supply roller (60) on the surface of the belt (73) of the film feeding device (70) and is fed toward the container (B). Front edge (F1) of film (F) on surface
When approaching the vicinity of the vacuum suction hole row (11a) (11b) of the cylindrical mandrel (10), the suction action of the belt surface of that portion is stopped, the front edge of the film (F1), the belt (73) The cylindrical mandrel (10) is released from the suction force on the surface and is suction-held on the outer surface of the cylindrical mandrel (10) by the vacuum suction force (FIGS. 1 and 2). At this time, the film (F)
As shown in FIG. 3 [I], the front end edge portion (F1) of one of the two rows of the vacuum suction hole rows (11a) (11b) (in this embodiment, the row on the left side when facing (11a)) is sucked and held by the suction force, and the other vacuum suction hole row (11b) is released to suck and hold the trailing edge (F2) of the film.

At the same time that the front edge (F1) of the film (F) is adsorbed and held by the vacuum suction hole row (11a) of the mandrel (10),
(10) rotates about the axis (counterclockwise in the example in the figure) at a speed equal to the traveling speed of the belt (73) (feed speed of the film), and the film (F ), And wind it around the mandrel (10) (Fig. 3).

Vacuum suction hole row (11a, 11b) by rotating the mandrel (10) almost once
Return to the original position, the vacuum suction hole array
It faces the rear edge (F2) of the film (F) on the (73) surface,
The rear edge portion (F2) is detached from the surface of the belt (73) and is removed from the mandrel.
The vacuum suction hole array (11b) (see FIG. 3 [I]) that has been released as shown in (10) is sucked, and the edge of the rear edge (F2) is
It overlaps the front edge (F1) (Fig. 4).

When the front edge portion (F1) and the rear edge portion (F2) of the film (F) are adsorbed by the vacuum suction hole row (11a, 11b) of the mandrel (10),
The mandrel (10) is the leading edge (F1) and trailing edge of the film.
The overlapping portion with (F2) rotates to a position facing the front of the film pressing device (80), and stops at that position. The film pressing device (80) advances toward the cylindrical mandrel (10), and the pressing surface portion (81) presses the overlapping portion of the film against the mandrel (10) (Fig. 5). As a result, the overlapping surfaces of the film (F) are joined (heat fusion in this case).
It becomes a tube.

When the film (F) is formed into a tube, the mandrel
Stop the suction of the vacuum suction hole (11) of (10) and film (F)
And pull out the mandrel (10) from between the container (B) and the container (B) on the holding table (50),
Or lower it from the holding table (50) and, as shown in FIG. 6,
When heat shrinking treatment is performed by the hot air blowing device (90), the film (F) is finished in a predetermined mounting mode in which the film (F) is in close contact with the surface of the container (B).

Since the horizontal cross section of the container (B) in the above example is circular, a cylindrical mandrel (10) was used, but in the case of a rectangular container, for example, a quadrangular tubular container,
A square tube-shaped mandrel (10) corresponding to the contour is used, and in the winding process of the film (F), the container (B) may be rotated together with the mandrel (10). Also,
When the front edge (F1) and the rear edge (F2) after winding the film (F) on the mandrel (10) are bonded by using an adhesive instead of the above heat fusion There is also. In that case,
After applying an adhesive between the overlapping surfaces of the film (F) using an appropriate adhesive applying jig, the overlapping surfaces are pressed by a pressing device (80) (of course, the pressing surface portion (81) in that case is a heater). Need not be built in).

〔The invention's effect〕

According to the method of the present invention, if the container has a simple cylindrical shape, of course, a container having irregularities such as a gourd shape, a drum shape, a container having an angular shape, or a container having a taper in the vertical direction, etc. Also, the film can be efficiently and accurately wrapped around various types of irregularly shaped containers without dropping, rolling, shifting, etc., and the appearance can be finished in a good appearance. Further, since the method of the present invention is performed by controlling the rotation / elevation of the cylindrical mandrel provided with the vacuum suction surface, the device configuration is simple and compact, and its practical value is high.

[Brief description of drawings]

1 to 5 are process explanatory views showing an embodiment of a film winding process according to the method of the present invention (in each figure, [I] is a front view, [II] is a plan view), and FIG. 6 is a heat shrinkage treatment. FIG. 7 is a front view showing the steps, FIG. 7 is a perspective view showing an example of a mandrel, FIG. 8 is a front view showing a conventional film winding method, and FIG.
FIGS. [I] to [III] are plan explanatory views showing a film winding process according to the conventional method, and FIG. 10 is a front view of a main part showing a film winding state according to the conventional method with respect to a deformed container. 10: Cylindrical mandrel, 11, 151: Vacuum suction hole, 50, 160: Container holder, 60, 170: Film supply roller, 70: Film feeding device, 73: Belt, 80: Film pressing device, 90: Hot air blowing device.

Claims (1)

[Claims] 1. A thin-walled cylindrical mandrel having a vacuum suction surface extending in the axial direction on a part of the outer surface is fitted onto a container held on a container holding table, and the container is fed by a film feeding device. The front end edge of the heat-shrinkable film (hereinafter referred to as "film") fed toward the vacuum suction surface of the mandrel is held by suction. The mandrel holding the front end edge of the film is held by suction. A process of winding the film around the mandrel by rotating the film about the center of the mandrel, adsorbing and holding the trailing edge of the film on the vacuum suction surface of the mandrel, and superimposing it on the leading edge of the film. The process of forming the film into a tube by joining the overlapping surfaces of the front edge and the rear edge of the film wound around the mandrel, and between the film formed on the tube and the container. Withdrawn Dorell, step a film heat shrinking treatment, a method of mounting a heat shrinkable film to a container made of capital.