JPH03227228A - Packaging method - Google Patents

Abstract

PURPOSE:To precisely perform positioning of the longitudinally cut place and to beautifully cut a corner by detecting the area of the light passing part of a V-shaped notch part or a rhombic through-hole in a packaging bag band with a detector such as a laser and detecting dislocation of the packaging bag band in the lateral direction from this area and correcting this dislocation. CONSTITUTION:A packaging bag band 10 is intermittently advanced by the feed rollers 12, 12 and a through-hole 9 is successively stopped to the lower part of a light source 16. At this time, the quantity of light of the laser beams 18 which are emitted from the light source 16 and passed through the said hole 9 is detected with a sensor 17. Since the part of the laser beams 18 which is allowed to collide against the packaging bag band 10 in the specified cross-sectional area is reflected or attenuated, the quantity of unattenuated light is detected and the area X1 of light passing part can be detected. Stopping position correspondent to this area X1 is calculated with a computer in which the relation of the area X1 and the said band 10 is memoried. This calculated value is transferred to a feed motor. The dislocation of this band 10 in the lateral direction is corrected by controlling the rate of feed of the band 10. Thereby the longitudinally cutting predetermined part 7 is allowed to coincide with the actually cutting position based on a second film cutter 14.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves cutting a sheet-like packaging bag band in which a number of packaging bags are arranged one after the other and separating it into individual packaging bags each having a corner cut. The present invention then relates to a packaging method for storing contents such as foods and medicines in these packaging bags.

[Conventional technology]

Conventionally, a sealed bag is obtained by stacking a pair of heat-bondable plastic films or composite films on top of each other and heat-bonding the peripheral edges to obtain a continuous bag band along the length direction, and by irradiating this bag band with radiation. After sterilizing the inside of the sealed bag, the bag strip is introduced into a sterile packaging chamber maintained in a sterile atmosphere, and in this sterile packaging chamber, the outer surface of the bag strip is sterilized, and the widthwise central part of the bag strip is sterilized along the length direction. The division operation of dividing one sealed bag into two storage bags by cutting the bag, the operation of filling the contents into each storage bag, and the operation of closing the opening of the storage bag by thermal bonding are automatically performed in sequence. An aseptic filling and packaging method using
2-34613).

[Problem to be solved by the invention]

However, the method described above is suitable for separating a packaging bag with corners at each corner and filling it with the contents, but in this method, each corner is It is not possible to obtain a square packaging bag (hereinafter referred to as a corner-cut bag) 2 made of a plastic film or the like whose corners are cut into a curved shape (in addition, 3 in the figure indicates the heat-sealed part). The reason why each corner is cut in this way is to prevent the corners from getting caught and causing trouble when the packaging bag is used.

The present inventors investigated a packaging method in which corner-cut bags are continuously separated and the contents are continuously stored therein, and first, as shown in FIG. A large number of packaging bag strings 6, each of which has a constant length of 4, 4 connected to each other through a section 5 to be cut horizontally, are arranged side by side in the horizontal direction via a section 7 to be cut vertically, and at both ends of the section 7 to be cut vertically. substantially V-shaped notches 8, 8. Vertical cutting planned area 7 and horizontal cutting planned area 5
A sheet-like packaging bag band 10 was produced in which through-holes 9 each having a substantially rhombus shape (in the drawing, an arcuate rhombus shape with each edge protruding inward) were formed at the intersections of the two. Next, the packaging bag strip 10 is cut at both planned cutting sections 5.7, and separated into individual packaging bags 2 with openings 11 at the cut points by the planned transverse cutting sections 5, as shown in FIG. An attempt was made to store the contents in this packaging bag 2 through the opening 11 and heat seal the opening 11.

In this case, the above-mentioned cutting of the packaging band 10 is performed by the feed roller 12 of the packaging device as shown in FIG.
10 intermittently in the direction of the arrow in the figure, first, the first film cutter 13 continuously cuts the section 5 to be cut horizontally, and then the second film cutter 14 sequentially cuts each section 7 to be cut longitudinally. do.

Here, when performing vertical and horizontal cutting using the cutters 13 and 14, the vertical cutting is performed in advance by forming various display printed parts on the surface of the packaging bag band 10 along the horizontal cutting area 7. An eye mark (square detection mark) is formed by printing, and the mark 15 is detected by a sensor (not shown) provided in the packaging device, and the vertical cutting point is positioned based on the detected position of this mark. I did it like that.

However, although the horizontal cutting is performed successfully, the method of positioning the vertical cutting location by detecting the detection mark 15 does not directly detect the corner cut location (the notch 8 or the through hole 9). Positioning becomes inaccurate. Therefore, the position of the vertical cutting point is likely to shift,
For example, the actual cutting location is often shifted from the intended vertical cutting section 7 in the horizontal direction, as shown by a and b in FIG.

It has occurred that it is not possible to obtain packaging bags with well-cut curved corners. Further, with the above-described positioning method, even if there is a printing shift in the printing position of the detection mark, it is not possible to appropriately position the cutting location.

The present invention has been made in view of the above circumstances, and involves cutting a sheet-like packaging bag band in which a large number of corner-cut bags are arranged in a row, separating it into individual corner-cut bags, and then storing the contents in these packaging bags. To provide a packaging method capable of precisely positioning a vertical cutting point of a packaging bag strip and obtaining a packaging bag with neatly cut corners.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention connects a pair of packaging bag strings, which are connected together in the longitudinal direction through the planned horizontal cutting section, with the unsealing sections facing each other, through the planned vertical cutting section. A sheet-like packaging bag band consisting of a large number of packaging bag strings arranged in parallel in the horizontal direction is cut at the above-mentioned vertical and horizontal cut points to separate the individual packaging bags from each other, and then the contents are placed in these individual packaging bags. In the packaging method, substantially V-shaped notches are provided at both ends of the longitudinal cutting section, and a substantially diamond-shaped cutout is provided at the intersection of the longitudinal cutting section and the horizontal cutting section. Through-holes are provided respectively, and the area of the V-shaped notch or diamond-shaped through-hole is detected by a detector such as a laser, and the position of the planned vertical cutting portion is detected from the area, and the detected position is There is provided a packaging method characterized in that the packaging bag strip is cut in the longitudinal direction to separate packaging bags each having four corners cut.

[For production]

In the present invention, the area of the light passing portion of the V-shaped notch or diamond-shaped through hole of the packaging bag strip is detected by a detector such as a laser, and the horizontal position of the packaging bag strip is determined from the area of this light passing portion. It detects the deviation and corrects this deviation.

EXAMPLES Next, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to the following Examples.

〔Example〕

1 and 2 show a packaging device used to carry out the present invention. In this device, a laser light source 16. A laser sensor 17 is provided below, and the sensor 17 detects laser light 18 emitted from the light source 16. In addition, the first
In FIG. 2, the same reference numerals are given to the same parts as in FIG. 9, and the explanation thereof will be omitted.

When positioning the vertical cutting point in this device, the packaging bag strip 1o is intermittently advanced in the direction of the arrow in FIGS. At this time, the sensor 17 detects the amount of laser light 18 from the light source 16 that has passed through the through hole 9, thereby detecting the area of the light passing portion of the through hole 9. That is, as shown in FIG. 3.4, the laser beam 18 from the light source 16 has a constant cross-sectional area, but the portion of this beam 18 that passes through the through hole 9 is transmitted to the sensor 17 without attenuation. Arrived and wrapped bag belt 1
Since the portion that hits 0 has a reflection value or is attenuated, the area X of the light passing portion is determined by detecting the amount of non-attenuated light with the sensor 17.

can be detected.

The area of the light passing portion detected by the sensor 17 in this way
8 calculates the stop position corresponding to the area X1 using a computer (not shown) that stores the relationship between the area and the stop position of the packaging bag band 10 in advance, and transmits the position to the feed motor (not shown). By the feed roller 12.
By adjusting the amount of feed of the packaging bag belt 10 by the transporter 12, the deviation of the packaging bag belt 1o in the lateral direction is corrected. Therefore, as a result, the longitudinal cutting portion 7 and the second film cutter 1
The actual cutting position according to No. 4 coincides with the actual cutting position.

Incidentally, it is preferable that the light 18 be irradiated onto the through-hole 9 at the rear side with respect to the traveling direction of the packaging bag strip 1o (see FIGS. 3 to 5).

Further, in this apparatus, although not shown in the drawings, following the above-mentioned separating operation of the packaging bag, a known method, for example, Japanese Patent Publication No. 62
As shown in Japanese Patent No. 34613, operations such as storing contents in a packaging bag and sealing the packaging bag are performed.

Therefore, according to the present device, the planned vertical cutting section 7 and the actual vertical cutting section can be made to match with high accuracy, and a packaging bag whose four corners are neatly cut can be obtained.

In the above embodiment, the relationship between the detection area and the stop position of the packaging bag band 1° is stored in the computer, and the feeding amount of the packaging bag band is adjusted based on this relationship.
For example, as shown in FIG. 5, the area (standard area) of the light passing portion of the through hole 9 when the packaging bag band 10 is stopped at an appropriate position where the planned vertical cutting portion 7 and the actual vertical cutting point coincide.
It is also possible to detect X2 in advance, compare this standard area X2 with the detected area X1 using a computer, and adjust the feed amount of the packaging bag strip based on the difference between these areas X1 and X2. Further, the cross-sectional shape and cross-sectional area of the laser beam 18 and the manner in which the light source 16 and sensor 17 are arranged with respect to the through hole 9 can be selected as appropriate. Further, in this embodiment, a detector using a laser beam has been described, but a detector using a phototube may be used in addition to the laser beam, and other configurations may be modified in various ways without departing from the gist of the present invention. There is no problem.

〔Effect of the invention〕

As explained above, in the present invention, a large number of corner-cut bags exist at the intersections of the V-shaped notches formed at both ends of the vertically cutting planned parts of the packaging bag belt and the vertically and horizontally cutting planned parts. Since the diamond-shaped through hole is directly detected with a detector to determine the position of the vertical cutting point, unlike the method of indirectly detecting the vertical cutting point using printed detection marks, it is possible to directly detect the vertical cutting point and the actual position. It is possible to precisely match the vertical cutting points, and therefore, it is possible to obtain a packaged product using a corner-cut bag in which each corner is neatly cut. Further, unlike the case where printed detection marks are used, there is no misalignment of the cutting location due to misalignment of the printing of the mark.

[Brief explanation of drawings]

Fig. 1 is a partially omitted schematic diagram showing a packaging device used in carrying out the present invention, Fig. 2 is a schematic sectional view of the portion indicated by the dotted chain line ■ in Fig. 1, and Figs. FIG. 6 is a plan view showing a corner-cut bag; FIG. 7 is a plan view showing a packaging bag band in which a number of corner-cut bags are connected; FIG. The figure is a plan view showing a corner-cut bag before sealing obtained by cutting a packaging bag strip, Figure 9 is a partially omitted schematic diagram showing an example of a conventional packaging device, and Figure 10 is an actual vertical cutting point and a vertical cut bag. FIG. 7 is an explanatory diagram showing a state where the cut portion is deviated from the scheduled cutting portion. 1... Corner, 2... Packaging bag, 4... Packaging bag planned area. 5... Planned cross cutting section, 6... Packaging bag assembly, 7...
Vertical cutting planned part, 8... Notch part, 9... Through hole,
1o...Packaging bag belt, 11...Opening part, 16...
・Laser light source. 17... Laser sensor, 18... Laser light.

Claims (1)

[Claims] 1. A large number of packaging bags in which a pair of packaging bag assemblies are arranged in a row in the vertical direction with the opening parts facing each other through the planned horizontal cutting part, and each set is arranged side by side in the horizontal direction with the planned cutting part in the vertical direction. In a packaging method in which a sheet-like packaging bag band consisting of a set of packaging bags is cut at the above-mentioned longitudinal and horizontal cut points to separate individual packaging bags from each other, and then contents are stored in these individual packaging bags. , providing substantially V-shaped notches at both ends of the planned vertical cutting portion, and providing substantially diamond-shaped through holes at the intersections of the planned vertical cutting portion and the planned horizontal cutting portion, respectively;
Detecting the area of the V-shaped notch or diamond-shaped through hole with a detector and detecting the position of the planned vertical cutting portion from the area;
Cutting the packaging bag strip in the longitudinal direction at the detected position,
A packaging method characterized by separating packaging bags each having four corners cut.