JPH09132214A - Equipment for perforating food package and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure cutting along a perforated line when opening food package. SOLUTION: A perforating equipment 9 is provided with a cutter 10 to perforate the flanges 1ba, 2ba of an egg package carried by a conveyer 6, and a cutter receiver 11. The cutter 10 is a disk whose periphery is sharp with cutting edges 11a divided by many slits 10b. The slits 10b inclines to the cutter rotating direction within 10 deg.-40 deg. against the cutter normal. The desirable slit width is between 0.5-0.75mm. When perforating, the cutting edge cuts the flanges, and a sharp angled cutting edge leaves a sharp notch directed from one part of the flanges to the other at desorption, enabling a continuous tearing along the perforated line with the help of stress concentration when tearing off the flanges.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perforation device for a food packaging container for perforating a food packaging container for storing and transporting and displaying foods such as chicken eggs therein. The present invention also relates to a method for perforating a food packaging container in which perforations are formed by using this apparatus.

[0002]

2. Description of the Related Art As a means for distributing and displaying foods such as eggs and mushrooms, for example, a sheet material of polyvinyl chloride resin or polystyrene resin is stored (packed) in a food packaging container formed by thermoforming. Is commonly done. Such a packaging container is composed of a container body and a lid united through a hinge portion, but after storing the food in the container body, the lid is closed by folding at the hinge portion,
A flange provided on the opposite side of the hinge is abutted and fixed with an adhesive tape or a stapler, or is not opened with a rubber band. However, recently, for mass-produced products, generally, the flange portions are linearly welded and fixed using an ultrasonic sealing device.

However, if the flange portions are welded to each other in this manner, it becomes difficult to easily open the lid. Therefore, a perforation is usually formed inside the seal line, and the flange portion is formed along the perforation. Are separated.

Such a perforation on the flange portion is performed by cutting a large number of sharp mountain-shaped cutting blades on the outer periphery or a slit 71b having a predetermined width as shown in FIG. This is performed by using a cutter 71 in which 71a are provided at equal intervals. The perforation is carved by rotating the food packaging container synchronously with the cutter 71 while moving the food packaging container, and providing an intermittent cut portion with a cutting blade. Since the initial perforation device was performed on a line separate from the ultrasonic sealing device, or at a separate position on the same line, it is best to engrave perforations along the inside of the seal line. It is difficult, and the perforation is outside the seal line, and it is difficult to separate it because it slips into the container body side. To deal with this, the ultrasonic sealing device and the perforation engraving device are installed close to each other on the same line, and the seal and the perforation are provided simultaneously so that the perforation is formed along the seal line. It has been proposed to keep the vehicle from escaping from the inside.
No. 113, No. 6-16211). Thus, the technique of perforation is being improved in combination with the improvement of the guide.

[0005]

However, even if the perforations are cut along the inside of the seal line, problems still remain. That is, the synthetic resin sheet material, which is the material of the container, has different physical properties as compared with paper or the like, and the tearing direction at the time of tearing tends to change. Therefore, even if force is applied to tear off the part where the seal line is provided along the perforation, it is not necessarily necessary to separate it along the perforation, and it will be deviated either inside or outside along the way There is. For this reason, there is a problem that the lid cannot be completely opened, or the container body or the lid is damaged in the middle and the stored food is damaged. The reason why the perforation warps and breaks may be that the connection between the cuts in the perforation is too long. However, if this is shortened, it may be naturally separated during transportation or the like, so there is a limit to this.

On the other hand, the inventor of the present invention has found that when a perforation is provided by the cutting edge of the conventional cutter, the end of the cut portion is almost flat (FIG. 6).
(Refer to (b)) It was found that it was broken on the way.
In other words, even if a force is applied in such a direction as to tear along the perforation, the stress concentrates on both sides of the end of the cut, so that the rupture proceeds in either left or right direction at this end, For this reason, it was considered that the cause was that separation did not proceed in the direction of perforation.

Accordingly, a first object of the present invention is to provide a notch at the end of the perforation to facilitate the break along the perforation in order to eliminate the cause of the breakage of the perforation. The purpose is to facilitate separation along perforations. A second object of the present invention is to provide a perforation device for food packaging containers, which enables such separation along the perforations.

[0008]

In order to achieve the above object, the present invention comprises a container body formed by molding a synthetic resin sheet material and a lid integrally formed via a hinge portion, A plurality of cutting blades separated by a plurality of slits on a disk-shaped outer periphery of the flange portion of the food packaging container formed by joining the flange portions provided on the opposite side of the hinge portion after storing the food therein. In a perforating device for a food packaging container for perforating a perforation by a cutter provided with a cutter and a cutter receiver having a receiving groove for partially entering these cutting blades, each slit is formed with respect to a normal line of the cutter. A notch for facilitating separation along the perforation is provided at the end of the notch at the perforation by being provided so as to be inclined in the angle range of 10 ° to 40 ° in the rotation direction of the cutter. There is a feature in the place.

Each slit is provided so as to be inclined at an angle of 10 ° to 40 ° in the rotation direction of the cutter with respect to the normal line of the cutter, and the width of each slit is 0.50 m.
It is desirable to form it in the range of m to 0.75 mm to further maintain the strength of the connecting portion and ensure the linearity of the separating line.

In the method of perforating a food packaging container according to the present invention, the perforation of the food packaging container is performed by using the above-described perforation device for a food packaging container. When the cutting edge starts to cut into one surface of the flange portion and the cutting portion is formed by finishing the cutting by the obtuse angle portion of the cutting edge, when the cutting edge separates from the flange portion, the acute angle portion forms one surface of the flange portion From the other side to form a notch at the tip of the notch to facilitate separation along the perforation.

In the above-described method for perforating a food packaging container, a plurality of egg storage portions are arranged side by side on a container body and a lid integrally formed with the container body, and one side is swingably connected via a hinge portion. However, a remarkable effect can be expected when applied to a chicken egg packaging container having a flange at each free end on the other side.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, among the food packaging containers to be perforated, the egg packaging container P having a particularly high usage rate will be described. One of the egg packaging containers currently on the market is one having a shape as shown in FIG. The egg packaging container P is formed by thermoforming a transparent sheet of polyvinyl chloride resin, polystyrene resin or polyester resin having a thickness of 0.1 to 0.6 mm.
The configuration of the chicken egg packaging container P includes a container body 1 and a lid 2, both of which are swingably integrated via a hinge portion 3. The container body 1 is provided with ten egg storage sections 1a, and the lid body 2 is provided with an egg restraining section 2a at a position facing each of the egg storage sections when the lid is covered. Flanges 1b and 2b are provided on the outer sides of the container body 1 and the lid 2, respectively, when the lids are closed.

FIG. 3 shows a case where the eggs are stored in the respective egg storage portions 1a of the above-mentioned egg packaging container P, and are sealed by a sealing line 4 formed by an ultrasonic sealing device described later and a perforating device. The state of the plane of the egg packaging container provided with the eye 5 is shown. In the embodiment of the present invention,
Immediately after the seal wire 4 is provided, a step of engraving a perforation is employed.

Next, the overall configuration of a packing line for a food packaging container in which the perforating device according to the present invention is installed will be described. As shown in FIG. 1, on a belt conveyor 6 which is a means for transporting food packaging containers, eggs are stored in the container body 1 of the egg packaging container P on the upstream side and transported with the lid open. The lid 7 can be fed to the ultrasonic sealing device 8 in a closed state by a lid-closing guide 7 (not shown) and a container-bottom guide (not shown). It should be noted that the means for transporting the food packaging container is not limited to the above-mentioned belt conveyor, and it is sufficient if the container can be stably transported to the sealing device and the perforation marking device at a required speed, a chain drive guide, an air guide. Shaft guides or other known methods can be used.

The guide 7, the guide for closing the lid, and the guide for the lower part of the container are all well-known technologies, but the lid 2 of the transported egg packaging container P is moved forward with the lid opened on the belt conveyor. , The lid is put on the container body 1 in order from the top, and a container that can be guided by the ultrasonic sealing device 8 to a position where a seal can be provided at an accurate position is adopted.

The above-mentioned ultrasonic sealing device 8 includes an ultrasonic horn 8a and a pressure roller 8b, which is also a known technique, and has a flange portion of the egg packaging container P fed by the belt conveyor 6. 1b and 2b are installed so as to be joined by welding.

On the downstream side of the conveyor of the ultrasonic sealing device 8, a perforating device 9 for food packaging containers is installed at a position close to the conveyor. The perforation device 9 includes a disk-shaped cutter 10 having a large number of cutting blades 10a as shown in FIG. 4, and a cutter receiver 11 having a receiving groove portion into which these cutting blades partially enter. I have it. When the egg packaging container P having the flange portion sealed by the ultrasonic sealing device 8 is fed into the perforating device 9, the cutter receiver 11 has a peripheral speed substantially equal to the transport speed of the belt conveyor 6. The flanges 1b and 2b are sandwiched between the cutter 10 and the cutter, and the cutter is driven to rotate through the flange. With the rotation of the cutter 10, the perforations 5 are formed in the flange portions 1b and 2b of the food packaging container P while the cutting blade 10a sequentially enters the receiving groove 11a of the cutter receiver (see FIG. 3). In this embodiment, the cutters are arranged so that the cutters are located above and the cutter receivers are arranged below, but this arrangement may be reversed.

Next, the cutter will be described. As shown in FIG. 4, the cutter 10 has slits 10b on the outer periphery of a disk made of high-speed tool steel or special tool steel.
It has a large number of cutting edges 10a partitioned by. Each slit 10b is provided so as to be inclined in the rotation direction (clockwise direction in the drawing) of the cutter 10 and in an angle range of 10 ° to 40 ° with respect to the normal line. Each cutting edge 10a is partitioned by the inclined slit as described above.
Has a shape close to a parallelogram, the cutting edge of the cutting edge has an acute angle portion 10c, and the cutting edge has an obtuse angle portion 10d. The cutting blade 10a has a blade base portion having the same thickness as the plate thickness of the main body, but has an inclined surface so that it becomes thinner from both sides toward the tip portion (outer periphery), and the tip portion has a sharp cutting edge. (See FIG. 6B).

Next, a description will be given of a mechanism for perforating the food packaging container P by the perforation device having the above-described cutter. As shown in FIG. 1, when the flange portions 1b and 2b of the food packaging container P are fed into the present apparatus 9, the cutter 10 is also driven to rotate by the cutter receiver 11 driven by the motor. When the flange portions 1b and 2b are fed into the device, the cutting blade 10a partially enters the receiving groove portion 11a of the cutter receiver (see FIG. 5), so the cutting blades sequentially cut into the flange portion. Thus, the cut portions 5a ... Are formed.

FIG. 5 is an enlarged view showing a state in which the cutting edge cuts into the flange portion. A plurality of cutting blades 10a enter the receiving groove 11a of the cutter receiver 11, and the acute angle portion 10c is formed by the flange. The state from the start of cutting into the portions 1b and 2b to the separation is shown. In FIG.
Several cutting blades 10a of the cutter partially enter the receiving groove 11a of the cutter receiver 11, and the acute angle portion 101c of the right-most cutting blade 101a in the cutting start state has the same transport speed as the flange portions 1b and 2b. It moves at the same speed and becomes like a cutting blade 102a, 103a located on the left side. When the cutting blade is about to be detached from the flange, the sharp notch 5b is pulled up from the bottom to the top of the cut 5a (see FIG. 6) by the acute angle portion 105c of the cutting blade 105a. Is formed.

FIG. 6 is an enlarged photograph showing a state of the cut portion generated by the cut. These photographs are in a set of four sheets, the upper two sheets show the state of the upper surface of the cut portion, and the lower two sheets show the state of the lower surface. The two left images are magnified 10 times, and the two right images are magnified 30 times. FIG.
As shown in (a), the above-mentioned notch 5b is formed at the tip of the notch 5a so as to be oblique and sharp on the upper surface side. Since the notch 5b is formed toward the rear end of the preceding notch in which a sharp tip is formed, stress concentration occurs in the notch when the flange is torn. It is thought that. Then, the tear progresses from there, and the break easily progresses to the next cut portion, which facilitates the separation of the flange portion. In addition, the upper surface side of the notch 5b is formed so as to tear up the notch when the sharp edge 10c of the cutting blade separates from the flange, so that a bulge 5c having a bulging skin surface is formed. Therefore, the cut portions are not connected to each other, and the connecting portion is configured so that the flange portion on the side having the sealing line is still integrated with the main body.

FIG. 6B is an enlarged photograph in which perforations are arranged in the same manner as in FIG. As shown in FIG.
It can be observed that the front end portion 65b is not formed with a notch toward the front notch, and is notched laterally. Even if the flange portion having the cut portion 65a having such a shape is cut along the perforation, a notch portion is formed on the side, so that the flange portion is easily broken therefrom, and eventually deviates from the perforation. It shows that the tendency to break is strong. In the case of a device in which the cutter is located below, the positions of the notch and the bulge are reversed.

In order to form such a notch for facilitating separation along the perforation at the cut portion of the perforation, the inclination angle α of the slit with respect to the normal line N of the cutter (see FIG. 4) From 10 ° to 40 °, preferably 15 °
It is necessary to make the angle range from ° to 35 °. If the inclination angle α is 10 ° or less, the cutout may be broken in the middle of separation because of insufficient formation of the notch. If the inclination angle α exceeds 40 °, a connection portion between the cut portions of the perforation cannot be left, and there is a possibility that the result of breakage from the beginning may occur. The width C of the slit 10b is desirably 0.50 mm to 0.75 mm, and the width b of the cutting blade 10a is 2.0 mm to 4.0 mm.
mm. If the width C of the slit 10b is smaller than this, the connecting portion becomes too small, and the bonding force of the perforation becomes too weak, which is not desirable. On the other hand, if the width b of the slit is larger than this, the connecting force of the perforations becomes too large, and the effect cannot be exerted despite the formation of the bent notch, and there is a risk of deviation in the cutting direction. There is. The width of the cutting blade is 2m
If it is less than m, the number of cuts increases and the resistance to cutting at the time of opening increases, which may cause a shift in the cutting direction. Therefore, it is desirable to select the cutting range appropriately.

It is desirable that the angle of the tip of the cutting blade be 10 ° or more and 23 ° or less from the viewpoint of ensuring excellent sharpness and rigidity. Further, the width of the receiving groove 11a of the cutter receiver is 0.5 m from the viewpoint of accurate cutting and protection of the cutting blade.
m to 0.8 mm is desirable.

[0025]

EXAMPLES The results of three experiments will be described below as examples. Example 1 In a chicken egg packaging container thermoformed from a sheet material of amorphous polyethylene terephthalate having a thickness of 0.25 mm,
An experiment was conducted in which ten chicken eggs were housed and the flange was welded by an ultrasonic sealing device, and then a perforation was cut inside the seal wire under the following conditions, and the perforations were separated from the perforation. Cutter outer shape (d) 75mm Cutter thickness 1.0mm Slit inclination angle (α) 20 ° Slit width (c) 0.65mm Cutting blade width (b) 2.8mm Cutting edge angle 16 ° Width of the receiving groove 0.6 mm The amount of the cutting blade entering the receiving groove 1.0 mm In this experiment, none of the 20 egg packaging containers broke off from the perforation and broke. In the case where the perforations were cut under the same conditions as above except that the inclination angle of the slit was set to 0 °, four out of the 20 pieces broke off from the perforations.

Example 2 The same experiment as in Example 1 was carried out except that the chicken egg packaging container was formed by thermoforming a polystyrene sheet. As a result, there were no breaks in the middle of the perforations in 20 experiments. On the other hand, in the experiment conducted under the same conditions except that the inclination angle of the slit was set to 0,
Seven of the 20 pieces were deviated from the perforations and broke on the way.

Example 3 A perforation was formed under the same conditions as in Example 1, except that the egg packaging container was formed by thermoforming from a vinyl chloride sheet, and the amount of the cutting blade entering the receiving groove was 0.7 mm. A similar experiment was performed for the set-up. As for this result, no break occurred in the same way in 20 experiments.
On the other hand, in the experiment performed under the same conditions except that the inclination angle of the slit was set to 0, 6 out of 20 pieces were broken in the middle of the perforation and fractured.

From the results of the above-described embodiments, it is clear that if the perforations are carved according to the present invention, separation along the perforations can be reliably performed.

In the above embodiments and examples,
Among the food packaging containers, the case where perforations are engraved in the egg packaging container has been particularly described. As the stored food, food packaging that stores various foods such as takoyaki, cake, and gyoza besides chicken eggs It is also applicable to containers.

[0030]

According to the present invention, in a device for perforating a food packaging container, a slit for individualizing a cutting blade of a cutter for forming a perforation is formed in a direction of rotation of the cutter by 10 ° relative to a normal line of the cutter. Since the food packaging container is opened so as to be inclined at an angle of 40 °, the cut does not deviate from the perforation and break on the way when opening the food packaging container.

The width of the slit is 0.50 m.
If it is formed in the range of m to 0.75 mm, the cutting along the perforations can be performed more reliably.

Further, according to the present invention, the slit is inclined, and a notch for facilitating the separation along the perforation is formed at the end of the notch at the acute angle of the cutting edge. While maintaining the strength between the notches,
This has the effect of facilitating cutting.

The application of the present invention to a chicken egg packaging container among the food packaging containers of the present invention is more effective because damage to chicken eggs can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view showing an arrangement state of a packing line of a food packaging container according to an embodiment of the present invention.

FIG. 2 is a development view of a chicken egg packaging container.

FIG. 3 is a plan view showing a state in which a seal and perforations are cut in a flange portion of the egg packaging container storing the eggs.

FIG. 4 is a front view of the cutter.

FIG. 5 is a partially enlarged view showing a state where a perforation is cut in a flange portion of the food packaging container by a cutter and a cutter receiver.

FIGS. 6A and 6B are photographs of a cut portion of a perforation, in which FIG. 6A shows the state of the upper surface and the lower surface when the angle of the slit is 30 °, and FIG. 6B shows the state when the angle of the slit is 0 °. The state of the upper surface and the lower surface is shown.

FIG. 7 is a front view of a conventional cutter.

[Explanation of symbols]

 P Food packaging container (chicken egg packaging container) 1 Container body 1a Chicken egg storage part 2 Lid 1b, 2b Flange part 3 Hinge part 5 Perforation 5a Notch 5b Notch 9 Perforating device for food packaging container 10 Cutter 10a Cutting Blade 10b Slit 10c Sharp part 10d Obtuse part N Normal line of cutter 11 Cutter receiving 11a Receiving groove

Claims (4)

[Claims] 1. A container body formed by molding a synthetic resin sheet material and a lid integrally formed via a hinge portion, and provided on the opposite side of the hinge portion after storing food therein. A cutter provided with a plurality of cutting blades partitioned by a plurality of slits on a disk-shaped outer periphery in the flange portion of the food packaging container formed by joining the flange portions, and a receptacle for partially entering the cutting blade. In a perforation forming apparatus for a food packaging container, which forms a perforation with a cutter receiver having a groove, each of the slits has an angle of 10 ° to 40 ° with respect to a normal line of the cutter in a rotation direction of the cutter. A perforation device for a food packaging container, which is provided so as to be inclined in a range. 2. A container main body formed by molding a synthetic resin sheet material and a lid integrally formed via a hinge portion, and is provided on the opposite side of the hinge portion after food is stored therein. A cutter provided with a plurality of cutting blades partitioned by a plurality of slits on a disk-shaped outer periphery of the flange portion of a food packaging container formed by joining flange portions, and a receiver for partially entering the cutting blades. In a perforation device for food packaging containers, in which a perforation is engraved by a cutter receiver having a groove portion, each of the slits is formed in a width of 0.50 mm to 0.75 mm, and A perforation device for food packaging containers, which is provided so as to be inclined with respect to a normal line in an angle range of 10 ° to 40 ° in a rotation direction of the cutter. 3. A perforation by the cutter using the perforation device for a food packaging container according to claim 1 or 2, wherein the flange is cut from an acute angle portion of the cutting blade. start,
After forming the cut portion by the cut by the obtuse angle portion of the cutting edge, when the cutting blade separates from the flange portion, the acute angle portion is directed from one surface of the flange portion to the other surface. A method of perforating a food packaging container, comprising a step of scratching and forming a cutout at the tip of the cutout to facilitate separation along the perforation. 4. The food packaging container according to claim 3, wherein a plurality of egg storage portions are arranged side by side on the container body and a lid integrally formed with the container body, and one side is swingably connected via a hinge portion. A chicken egg packaging container having a flange portion at each free end on the other side, wherein the perforations are cut on the inside of the flange portion after the flange portions of the container body and the lid are joined to each other. Perforation method for food packaging containers.