JPS5843314B2 - packaging - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is most suitable for application to a packaging body such as a corrugated cardboard carton, and relates to a packaging body wrapped using a synthetic resin film.

2. Description of the Related Art Shrink packaging is a conventional method for packaging packaging bodies such as cardboard cartons using synthetic resin films.

This is a method in which a heat-shrinkable synthetic resin film such as a polyethylene film is placed over a package, and then the film is heat-shrinked to firmly adhere to the local area of the package. There are two methods: a sleeve-type two-way sill-link method and a four-way sill-link method.

The sleeve-type two-way shrink method refers to a sleeve-shaped heat-shrinkable synthetic resin film 1 that is fitted into a package 2 as shown in Fig. 1, and which is heat-shrinked to form a second
As shown in the figure, it is strongly adhered to a local area of the package 2.

In addition, the four-sided seal link method is to further fit the bag-shaped heat-shrinkable synthetic resin film 3 from different directions into the package 2 which has been sealed on two sides as described above, as shown in FIG. 3 is heat-shrinked so that the entire circumference of the package 2 is covered with double layers of inner and outer films 1 and 3 as shown in FIG.

However, in the case of the sleeve type two-way shrink method mentioned above,
Since the hole-shaped unwrapped portions 1a and 1b of the film 1 will always remain on the two sides 2a and 2b of the package 2, in order to completely package the package 2, it must be placed in another mask-carton. It has to be repackaged and repackaged, which is very costly.

On the other hand, in the case of the above-mentioned four-way sealing link system, the hole-like unwrapped parts as mentioned above are completely sealed with each other by both films 1 and 3, so there is no need to use a master carton, etc. Since the film 3 is bag-shaped, there are problems such as air tends to get trapped inside the film when the film 3 shrinks due to heat.

In addition, almost the entire circumference of the package 2 is covered with the two films 1 and 3, both inside and outside, and there is a large amount of waste and waste in the film, resulting in a very high material cost.

The present invention was invented in view of the above-mentioned circumstances, and is applicable to shrink-wrapped packages using a first synthetic resin film having heat-shrinkable properties, such as sleeve-type two-way shrink-wrapped packages. A second synthetic resin film, for example, a non-shrinkable synthetic resin film of the same quality as the first synthetic resin film, is heat-sealed only to the surface of the first synthetic resin film where the hole-shaped unwrapped portion remains. The hole-shaped unwrapped portion of the first synthetic resin film is sealed with a second synthetic resin film.

With this configuration, it is possible to obtain a completely wrapped package without using a master carton or the like, while significantly reducing the material cost of the synthetic resin film.

Examples of the present invention will be described below with reference to the drawings.

First, reference numeral 6 in FIG. 5 indicates a package such as a cardboard carton, and this package 6 has been shrink-wrapped in advance by the sleeve type two-way shrink method described above.

That is, 7 is a heat-shrinkable synthetic resin film such as a polyethylene film used for the packaging (hereinafter, this film will be referred to as the first synthetic resin film), and as mentioned above, the film 7 was initially shaped like a sleeve. It was fitted into the packaging body 6 and heat-shrinked, resulting in a strong adhesion to the packaging body 6 at the same time.

As mentioned above, as a result of sleeve-type two-way shrink packaging, this first synthetic resin film 7 has two sides 6 of the packaging body 6.
a, 6b, a pair of hole-shaped unwrapped parts 7a, 7
b remains.

Therefore, the present invention provides another pair of synthetic resin films (hereinafter referred to as second synthetic resin films) 8at8b only on the two sides 6a and 6b of the package 6 which is wrapped in the sleeve-type two-way shrink-wrapped package 6. The pair of hole-shaped unwrapped portions 7a and 7b are sealed with the second synthetic resin films 8a and 8b, resulting in a complete package as shown in FIG. A package 6 was obtained.

Note that as the second synthetic resin films 8a and 8b, a polyethylene film or the like having the same quality as the first synthetic resin film 7 is used, and this second synthetic resin film 8a.

A non-shrinkable film is used for 8b, and therefore, during the heat fusion process, the second synthetic resin films 8a, 8
No "wrinkles" were formed on b, and an extremely beautiful finish was obtained.

Next, an automatic side welding machine for sleeve type for heat-sealing the second synthetic resin films 8a and 8b to the two sides 6a and 6b of the package 6 will be explained with reference to FIGS. 7 to 10C. .

A belt conveyor 11 is installed horizontally on a conveyor frame 12.

13a. Reference numeral 13b denotes a pair of frames arranged on both left and right sides of the conveyor frame 12, and both frames 13a.

Subframes 14a and 14b are placed on 13b, respectively.

One sub-frame 14a is fixed on the pedestal 13a, and the other sub-frame 14b is movable via a plurality of guide rollers 16 on a pair of guide rails 15 fixed horizontally on the pedestal 13b. It is placed so that it can slide freely in the left and right directions in FIG.

Note that this subframe 14b is configured to be slid and adjusted by a screw feeding mechanism that includes a threaded cylinder 17 fixed to the lower central portion of the subframe 14b and a feed screw 19 with a handle 18 rotatably supported on the pedestal 13. has been done.

and both subframes 14a. A pair of heating plates 21a and 21b are vertically disposed on opposite sides of the heating plate 14b, facing each other.

The heating surfaces 22at22b, which are the front surfaces of both heating plates 21a and 2lb, are each coated with fluorine to prevent the synthetic resin film from welding.

Further, both of these heating plates 21a and 21b have a pair of guide rails 23a fixed horizontally to their back surfaces, respectively.
23b is supported by a plurality of guide rollers 24a and 24b which are pivotally supported by both sub-frames 14a and 14b, respectively, so that it can slide freely in the left-right direction in FIG.

The heating plates 21at21b are configured to be slidably driven by a pair of air cylinders 25a and 25b fixed to the subframes 14a and 14b, respectively, on their back surfaces.

And each heating surface 22a of these heating plates 21a, 21b
A pair of hot wires 26a for cutting the film are located at the upper position of +22b.

26b are stretched horizontally.

The heating wires 26a and 26b are configured to be slidable in the vertical direction so that the cutting position of the film can be varied up and down according to the size of the package.

On the other hand, the above-mentioned pair of second synthetic resin films 8a are provided on the upper part of the side sub-frame 14a>14b.

A pair of film rolls 28a made up of rolls 8b
, 28b are placed horizontally.

Note that 29a > 29b indicates spare film rolls having different film widths.

A pair of second synthetic resin films 8a and 8b pulled out from both film rolls 28a and 28b are guided by a plurality of guide rollers 30a>30b and are pivoted on both subframes 14a and 14b, respectively. It is configured such that it is pulled out by a pair of delivery rollers 31 a and 3 l b, sent by these delivery rollers 31 a y 31 b, and drawn out perpendicularly to the front positions of both heating plates 21 a and 21 b. has been done.

Note that the side delivery rollers 31a and 531b are provided with drive chains 33a and 33b, respectively, on a pair of servomorphs 32a and 32b fixed to the subframe 14at14b.
These servo motors 32
It is configured to be driven by a t 32 b.

Furthermore, pressure rollers 34a and 34b are configured to be pressure-bonded to the two feed rollers 31a and 3lb, respectively, and the two second synthetic resin films 8a.

8b is configured to be pressed against both feed rollers 31at31b by these pressure rollers 34a and 34b and sent out.

Note that 35at and 35b are both pressure rollers 34a and 34b.
This is a pressing spring mechanism for pressing the rollers 31 a and 3 l b against both feed rollers 31 a and 3 l b.

In addition, 3 6 a and 36 b are used to roll both second synthetic resin films 8 a and 8 b with both rollers 31 a before starting work.

Both pressure rollers 34 a and 34 b are inserted between both feed rollers 31 and 34 a and 31 b and 34 b respectively.
These handles are used to separate the handles 36a and 36b from each other, and by rotating these handles 36a and 36b, the pair of rotating cams 37a and 37b are rotated, and the pressure rollers 34a>34b are pressed. It is configured to be pulled away from both feed rollers 31 a t 31 b against the spring force of the spring mechanism 35 a t 35 b.

Furthermore, 38a and 38b are both feed rollers 31.
This is a film guide for vertically hanging the second synthetic resin films 8a and 8b sent out at the positions a and 3lb at the front positions of the side heating plates 21a and 21b.

This machine is usually used in parallel with a conventionally known sleeve type two-way shrink packaging machine, and 40 indicates a delivery conveyor of the sleeve type two-way shrink packaging machine (not shown). There is.

Further, 4 1 a 54 l b is a pair of guide rails for correctly sending the package 6 transferred by the conveyor 40 to a predetermined position on the belt conveyor 11, and one guide rail 41a is fixed. The other guide rail 41b is configured to be slidable in the left-right direction in FIG. 9 in accordance with the size of the package 6.

Further, the belt conveyor 11 is linked to a drive motor 47 via a drive chino 45, a speed reduction mechanism 46, etc., and is configured to be driven by this motor 47.

Next, a procedure for automatically heat-sealing the second synthetic resin films 8a and sb to the packaging body 6 2i16a and 6b using the sleeve type automatic side welding machine described above will be explained.

Before starting the work, the feed screw 19 is rotated by the handle 18, and due to the screw feeding action of the feed screw 19 and the screw tube 17, the entire side frame 14b is slid in the left-right direction in FIG. The spacing between the heating plates 21at21b is adjusted to the most suitable spacing according to the size of the package 6.

Similarly, both guide rails 41a. The spacing between 41b is also adjusted.

In this state, when the start switch is turned on, the motor 47 starts driving the belt conveyor 11 one time in the direction of the arrow in FIG. 8, and automatic operation is started.

First, the above-mentioned package 6 is subjected to sleeve-type two-way shrink wrapping using a conventionally known sleeve-type two-way shrink wrapping machine, and the package 6 shrink-wrapped with the first synthetic resin film 7 is transferred to the conveyor 40. and is sent onto the belt conveyor 11 from the right direction in FIG.

The package 6 placed on this belt conveyor 11
The side heating plate 21 passes between both guide rails 41a and 41b.
a, 21b.

At this time, the package 6 has two pieces 6a and 6b attached to the side heating plate 21.
Belt conveyor 11-L in the direction opposite to at21b
It will be loaded onto and transported.

When the package 6 reaches between the side heating plates 21a and 2Ib, the package 6 is detected by, for example, a photoelectric sensor (not shown), the motor 41 is stopped, the belt conveyor 11 is stopped, and the package 6 is As shown in Figure 10A, the side heating plate 21 a
, 21b.

Then, first, both feed rollers 31a and 3lb are rotated and driven in the direction of the arrow in FIG.
The synthetic resin film 8a 58b is the side heating plate 21a,
, 21b to a predetermined length as shown by the dotted line in FIG. 10A.

Then, both the air cylinders 25a, 25b are driven by 1, and the side heating plates 21a, 2b, 2b of the package 6 are
The side heating plates 21a and 21b are pressed against the two parts 6a and 6b of the package 6 as shown in FIG. 10B by being pushed out for a predetermined stroke toward the surface S a t 6 b, and are stopped in this state for several seconds.

As a result, the synthetic resin films 8a t 8b of both cylinders 2 are heated on two sides 6 of the package 6 by the side heating plates 21 a and 2 l b.
a 56 b, and both of these second synthetic resin films 8 a t 8 b are pressed against the first synthetic resin film 7
are heat-sealed as described above.

At this time, both hot wires 26a and 26b come into contact with both second synthetic resin films 8a and 8b, and these two hot wires 2
Both second synthetic resin films 8a by 6at26b
, 8b is thermally cut at height-length in FIG. 10B.

As a result of the heat fusion, the pair of hole-shaped unwrapped portions 7 a y 7 b of the first synthetic resin film 7 are formed by the second synthetic resin films 8 a and 8 b as described above. The package 6 is sealed with the synthetic resin films 8a, 8b, and the package 6 is completely packaged as described above.

Also - Synthetic resin film 8 a t 8 of the above plan 2
Since non-shrinkable film is used as b, as described above, both heating plates 21 a > 2 l b as described above are used.
When thermally bonding these films 8 a and 8 b
There is no "wrinkle" caused by heat shrinkage, and a complete package 6 with a very beautiful finish can be obtained.

With the above, a series of automatic heat fusion operations are completed, and after that both heating plates 21a and 2ib are connected to both air cylinders 2 and 2 as shown in Fig. 10C.
It is returned to the original position at 5a and 25b.

After this, the belt conveyor 11 is started to be driven again by the mower 47, and the package 6 is completely wrapped as described above.
will be sent to the next process.

As described above, the present invention is characterized in that a second synthetic resin film is heat-fused only on the surface where the hole-like unwrapped portion of a package that has been shrink-wrapped using a first synthetic resin film having heat-shrinkable properties remains. Since it is designed to obtain a completely wrapped package by attaching the product and sealing the hole-like unwrapped part, it can be completely packaged in the same way as products packaged using the conventional sleeve type two-way shrink method. Therefore, there is no need for a separate master carton, etc., and a product can be obtained at a very low cost.

In addition, since only the hole-like unwrapped portions of the first synthetic resin film are sealed with the second synthetic resin film, the amount of material for the second synthetic resin film is very small.
Compared to packaging using the conventional four-sided seal link method, there are advantages such as the ability to significantly reduce the material cost of the synthetic resin film.

[Brief explanation of drawings]

1 to 4 are perspective views illustrating a conventional example. FIGS. 5 and 6 are perspective views illustrating the packaging state of a package to which the present invention is applied. FIG. 7 is a front view illustrating a sleeve type automatic slide welding machine for carrying out the present invention, FIG. 8 is a side view of the same, and FIG. 9 is a plan view of the same. FIGS. 10A to 10C are diagrams illustrating the sequence of automatic heat-sealing operations for synthetic resin films by the sleeve-type automatic slide welding machine. Further, in the reference numerals used in the drawings, 6 is a package, 7 is a first synthetic resin film, 7 a and 7 b are hole-shaped unwrapped parts, and 8 a + 8 b is a second synthetic resin film.

Claims (1)

[Claims] 1. In a package shrink-wrapped using a first synthetic resin film having heat shrinkability, a second synthetic resin film is heat-shrinked only on the surface where the hole-like unwrapped portion of the first synthetic resin film remains. A package characterized in that the hole-like unwrapped portion of the first synthetic resin film is sealed by the second synthetic resin film by fusion bonding.