JPH07125765A - Package and its packaging method - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the packaging appearance and improve the commercial value, and to allow the heat-shrinkable film to be easily opened without being accidentally broken during heat-shrinkage. It is in. [Composition] The characteristic of the package is that the front and rear surfaces and the upper and lower surfaces of the container 3 are covered with a heat-shrinkable film 4, and both ends 4a of the film 4 are bent along the container 3 side. The film 4 has perforations 39 formed by melting the film 4 by heat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package formed by forming perforations on a heat-shrinkable film for covering a container such as a lunch box and a packaging method thereof.

[0002]

2. Description of the Related Art Conventionally, for example, many bento boxes containing foods are packed with a heat-shrinkable film, and the film has a purpose of facilitating degassing during heat shrinkage by a shrink device. Deaeration holes are formed.

[0003]

The means for wrapping the lunch box is to form a heat-shrinkable film on the band into a tubular shape, insert the lunch box into the tubular film, and weld and weld both ends of the film. The film was then heat-shrinked.

For this reason, the above-mentioned package has a drawback that the welded portions at both ends thereof are projected to both sides, the welded portions are bulky, the packaging appearance is deteriorated, and the commercial value is lowered.

Further, in the case of shrink-wrapping like the above-mentioned package, it is a problem how the film does not break from the degassing hole as a starting point or the film can be easily opened.

The present invention has been made in view of the above-mentioned conventional problems, and can improve the packaging appearance to improve the commercial value, and moreover, the heat-shrinkable film does not break carelessly when it is heat-shrinked. It is an object to make it possible to easily open the package.

[0007]

The technical means taken by the present invention to solve the above problems are as follows. That is, the characteristic of the package is that the front and rear surfaces and the upper and lower surfaces of the container 3 are covered with the heat-shrinkable film 4, and both ends 4a of the film 4 are bent along the container 3 side.
The perforation 39 is formed on the film 4 by melting the film 4 by heat.

The front and rear surfaces and the upper and lower surfaces of the container 3 are covered with a film 4 having heat shrinkability, and both ends 4a of the film 4 are bent along the container 3 side. The perforation 39 is formed on the side surface of the container 3.

Further, the characteristics of the packaging method of the package are as follows:
A heat-shrinkable film 4 is disposed in front of the container 3 to be transferred, the front and rear surfaces and the upper and lower surfaces of the container 3 are covered with the packaging film 4, and both ends 4a of the film 4 are attached to the side surface of the container 3.
After being bent along 3e, the film 4 is melted by heat to form perforations 39 on the film 4, and the perforations 39 are formed.
That is, the film 4 is heated and shrunk while being degassed via.

At the front of the container 3 to be transferred, both end portions are
A perforation 39 is formed on 4a and a heat-shrinkable film 4 is disposed, and the packaging film 4 covers the front and rear surfaces and the upper and lower surfaces of the container 3, and the perforation 39 is located on the side surface 3e of the container 3. As described above, after bending both end portions 4a of the film 4 toward the container 3 side, the film 4 is heated and shrunk while being degassed through the perforations 39.

[0011]

In the packaging body and the packaging method of the present invention, since both ends 4a of the heat-shrinkable film 4 are along the side surface of the container 3, the appearance of the packaging form is improved.

Furthermore, since the perforations 39 are formed by melting the film 4 by heat, or are formed at both end portions 4a located on the side surface of the container 3 by being folded, the perforations 39 are formed when the film 4 is heated and contracted. Can be effectively degassed via
There is no risk of the film 4 breaking, and the film 4 can be easily broken and opened by utilizing the perforations 39 used for degassing during heat shrinkage.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 5, reference numeral 1 denotes a transfer device for transferring a container 3 such as a lunch box containing food, and 5 denotes a container 3 transferred by the transfer device 1 coated with a heat-shrinkable film 4. A packing machine, 7, 7a are supply shooters for supplying chopsticks 9 in front of the container 3 to be transferred, and 8 is a shrink device.

The film 4 is made of, for example, a polyethylene type self-adhesive stretch / shrink film, and the dancer roller 12 and the brake roller 13 are wound in a roll shape as shown in FIG. It is attached to the packaging machine 5 so as to be able to be fed downward through the packaging machine 5. Reference numeral 15 denotes a vacuum body for adsorbing the lower end of the film 4, which is provided below the container 3 which is transferred to the film 4 side by the transfer body 17 on the mounting table 16 of the packaging machine 5.

A pressing roller 19 presses the upper surface of the container 3 adsorbed by the vacuum body 15 and pressed into the film 4 in a tension state and transferred onto the conveyer roller 20, and 22 a film 4 is attached to the rear portion of the container 3. To cover the film 4
Is a stretch bar that can be moved up and down so as to pull it down to below the vacuum body 15, and 23 is a cutter that cuts the portion of the film 4 between the container 3 and the stretch bar 22.

Reference numeral 26 denotes a pair of right and left film air nozzles. The air nozzles 26, 26 project in the width direction of the film 4 from the container 3 when the carrier 17 pushes the container 3 into the film 4. Air is ejected to the inside of both end portions 4a in front of the film 4 so that both end portions 4a are not bent backward and wrinkles do not occur. 28, 28 blow air from below onto the chopsticks 9 so that the chopsticks 9 stand up and the container 3
It is a pair of chopstick air nozzles along the sides of the.

As shown in FIGS. 1, 3 and 4, reference numeral 30 denotes a belt roll device for sandwiching and crimping both edge portions 4a of the film 4 from above and below, which are provided on both sides of the container 3, respectively. There is. The belt roll device 30 is provided with a pair of left and right support plates 31 and a pair of upper and lower side seal press rollers 32 rotatably supported by the respective support plates 31.

Reference numeral 33 denotes a film bending means for bending both ends 4a of the film 4 pressure-bonded and sealed by the side-sealing pressure roller 32 to the container 3 side and sticking the film 4 onto the film 4. Is a pair of upper and lower rod-shaped first and second air nozzles 3 fixed to the support plate 31 via a bracket 54 at a position downstream of the pressure roller 32 for side seal.
It consists of 5, 36.

Reference numeral 38 denotes a transfer device for transferring the container 3 as shown in FIGS. 3 and 4, which is provided between the support plates 31. The transport device 38 includes a pair of inner belts 41 rotatably wound around front and rear shafts 40a and 40b, a rear shaft 40b and an intermediate shaft.
42 and a pair of outer belts 43 wound around.

Reference numeral 45 is a perforation forming means for forming perforations 39 on the film 4 which covers the container 3. The perforation forming means 45 is the support plate as shown in FIGS.
The rotary shaft 46 rotatably supported on the 31 side is provided.
A heater unit 47 is rotatably provided at a plurality of intervals at 46, and a large number of heating needles 48 to be heated by the heater unit 47 are radially provided on each heater unit 47 in a protruding manner.

The central heater unit 47 is located below the inner belt 41, and the tip of the heating needle 48 is placed between the inner belts 41 so as to be pierced into the film 4 and melted to form perforations 39. Moreover, it protrudes from the inner belt 41. Further, the heater units 47 on both sides are located beside each inner belt 41, and the perforations 39 can be formed on the film 4 by the respective heating needles 48 in the same manner as described above.

An embodiment of the present invention has the above-mentioned configuration,
Next, an example of its use will be described. First, the plurality of containers 3 are transferred by the transfer device 1 with a predetermined interval, and when the containers 3 are transferred to the packaging machine 5, they are pushed by the transfer body 17 and transferred on the mounting table 16, and One chopstick 9 is supplied to the front of each container 3 (see FIG. 6A).

Further, when the container 3 is transferred while pushing the chopsticks 9, air is jetted upward from the chopstick air nozzles 28, 28, and the chopsticks 9 are raised in a state where the front side of the chopsticks 9 is lifted upward. 3 along the front surface 3a. Further, the container 3 is pushed into the vertically stretched film 4, but at this time, air is ejected from the air nozzles 26, 26 toward the folded film 4, so that both ends of the film 4 are pushed. The portion 4a does not bend backward or wrinkle, and the front surface of the film 4 has a substantially linear shape in a plan view.

Next, when the container 3 is transferred to the conveyor roller 20, the container 3 is pressed by the pressing roller 19 while the front surface 3a and the upper and lower surfaces 3b and 3c thereof are covered with the film 4, and the stretch bar 22 is lowered. And feed film 4 downward,
After covering the rear of the container 3 with the film 4, the film 4 is cut by the cutter 23 (see FIGS. 6B and 6C).

Further, when the container 3 is transferred by the transport device 38, both end portions 4a of the film 4 are securely pressure-bonded and sealed by the rotating side-sealing pressure roller 32.

Next, air is ejected from the first air nozzle 35, the air bends both ends 4a of the film 4 downward, and further, a predetermined time elapses from the operation of the first air nozzle 35 (for example, 0.3 The second air nozzle 36 is actuated and air is ejected from its ejection port. The air from the second air nozzle 36 further bends both ends 4a along the film 4 and causes the both ends 4a to adhere integrally to the film 4 over the entire length in the front-rear direction due to the self-adhesiveness of the film 4 (FIG. 1). reference).

On the other hand, the heater unit 47 is rotated by the rotary shaft 46.
Is rotated, the tip of the heating needle 48 heated by the heater unit 47 melts the film 4 and sequentially forms perforations 39 in the transport direction. The perforation 39 has its periphery melted and hardened, and the opening shape of the perforation 39 is constant regardless of the depth of the heating needle 48.

Further, when the container 3 is conveyed by the inner belt 41 and placed on the outer belt 43, both end portions of the film 4 are
4a is pressed against the outer belt 43 by the container 3, and the bent state is secured.

Next, when the film 4 is transferred to the shrink device 8, both end portions 4a of the film 4 located on the lower surface 3b of the container 3 are pressed by the container 3 by being heated by a heating table (not shown). The film 4 is sealed in this state.

In the shrink device 8, the perforations 39 formed on the film 4 are formed on the central portion and both side portions of the lower surface 3b of the container 3, and the lower surface 3b portion is higher than the upper surface of the lid. Since there are many uneven surfaces, it is easy to degas through the perforations 39 during heat shrinkage, and the film shrinkage can be performed quickly (see FIG. 7).

Further, the perforation 39 has a function of a deaeration port to effectively perform shrink wrapping, and the perforation 39
Has an appropriate strength, there is no risk of careless breakage from the perforations 39 when the film 4 contracts, and heating control of the shrink device 8 becomes easy. Moreover, since the perforations 39 are provided on the lower surface 3b of the container 3, there is an effect that the film 4 can be ruptured through the perforations 39 to facilitate the opening.

As shown in FIG. 8, each heater unit
It is also possible to add a plurality of heating needles 48 to the 47.

Further, as shown in FIGS. 9 and 10, perforations 39 may be formed on the film 4 before covering the container 3. That is, the perforation forming means 45 is provided on the way of feeding the film 4, and the pair of rollers 50a and 50b supported on the packaging machine 5 side and the film 4 wound on the one roller 50b are rotated from above. A pair of left and right perforation forming rollers 51 that are freely pressed and the other roller 50.
It is composed of a swingable weight 52 which applies a braking force to a and tensions the film 4.

Each perforation forming roller 51 has a saw-toothed cutter 53 on its outer periphery, and is provided so as to be swingable in the vertical direction and movable in the horizontal direction via a stay 54. Further, the one roller 50b is formed with a plurality of circumferential grooves 55 into which the cutters 53 are inserted so that the distance between the perforations 39 on both sides can be adjusted.

Perforation forming roller 51 having the above structure
The perforations 39 formed on the film 4 are provided at the portions located on both side surfaces 3e of the container 3 when the container 3 is wrapped with the film 4 as shown in FIG. Therefore, when opening the film 4, first, both end portions 4a
When the film 4 is peeled off from the film 4 and the both ends 4a are pulled and pulled to the left and right, the film 4 can be easily broken and opened through the perforations 39.

Further, as shown in FIG. 12, the film 4 is provided with the cutter 53 directly on one roller 50b, so that the number of parts can be reduced and the weight 52 can be reduced.
Thus, the other roller 50a is braked to apply tension to the film 4, so that the perforations 39 can be reliably formed.

The film 4 is not limited to the polyethylene type, but may be a polyvinyl chloride type, as long as it is a shrinkable shrink film, and each constituent member is also limited to the above embodiment. It is not something that will be done.

[0038]

EFFECT OF THE INVENTION The package of the present invention is such that the front and rear surfaces and the upper and lower surfaces of the container are covered with a film having heat shrinkability, and
Since both ends of the film are bent along the container side, the packaging form can be improved and the commercial value can be improved.

Moreover, since a sewing machine is formed on the film by melting the film with heat, it is possible to give the sewing machine an appropriate strength and to easily control the heat shrinkage temperature of the film. There is.

Further, since the film has perforations formed so as to be located on the side surface of the container, both ends are peeled from the film and pulled at both ends to easily break through the perforations. Is possible.

Further, in the packaging method of the package, the heat-shrinkable film is melted by heat to form perforations and then the heat-shrinkable film is heat-shrinked. There is an advantage that degassing can be effectively performed through the perforations, the film can be prevented from being inadvertently broken from the perforations, and heating control in the shrink device can be easily performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view of essential parts showing an embodiment of the present invention.

FIG. 2 is a front view including a cross section of the same portion.

FIG. 3 is a front view of a transfer device.

FIG. 4 is a plan view including a partial cross section of the transport device.

FIG. 5 is a front view showing the whole.

FIG. 6 shows an embodiment of the present invention, and (A) to (C) are schematic views of coating a container with a film.

FIG. 7 is a perspective view showing a lower surface side of a container packaged in a heat shrinkable film.

FIG. 8 is a side view showing another embodiment of perforation forming means.

FIG. 9 shows another embodiment of the present invention (a) is a perspective view,
(B) is a plan view.

FIG. 10 is a front view of the same.

FIG. 11 shows a container wrapped in heat shrink film,
(A) is a perspective view and (B) is a sectional view.

FIG. 12 is a front view showing another embodiment of the present invention.

[Explanation of reference numerals] 3 ... container, 4 ... film, 4a ... both ends, 8 ... shrink device, 39 ... perforation, 45 ... perforation forming means, 47 ... heater unit, 48 ... heating needle

Claims (4)

[Claims] 1. The front and rear surfaces and the upper and lower surfaces of the container (3) are covered with a heat-shrinkable film (4), and both ends (4a) of the film (3) are on the container (3) side. A package which is bent and is formed, and perforations (39) are formed on the film (4) by melting the film (4) by heat. 2. The front and rear surfaces and the upper and lower surfaces of the container (3) are covered with a heat-shrinkable film (4), and both ends (4a) of the film (3) are on the container (3) side. A package in which the film (4) is bent and is formed with perforations (39) formed on the side surface (3e) of the container (3) on the film (4). 3. A heat-shrinkable film (4) is arranged in front of a container (3) to be transferred, and the packaging film (4) covers the front and rear surfaces and the upper and lower surfaces of the container (3). After bending both ends (4a) of the film (3) along the side surface (3e) of the container (3), the film (4) is melted by heat to form perforations (39) on the film (4). ) Is formed, and the film (4) is heated and shrunk while being degassed through the perforations (39). 4. A film (4) having perforations (39) formed at both ends (4a) and having heat shrinkability is disposed in front of the container (3) to be transferred, and the packaging film (4) is provided. ) To cover the front and rear surfaces and the upper and lower surfaces of the container (3) with the perforation (3
The film (3) which is located on the side surface of the container (3)
The package (2) is characterized in that both ends (4a) of the film are bent along the container (3) side and then the film (4) is heat-shrinked while being degassed through the perforations (39). Packaging method.