JPS6218408B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a vertically long stick-shaped packaging bag that has good tearability at the opening point when packaging powdered soups, liquid soups, etc. The present invention relates to a method for manufacturing a continuous packaging bag for automatically packaging items.

Generally, packaging bags made of laminated sheets shaped into vertically long bags are used for packaging foods such as liquid soups.

Conventionally, the above-mentioned laminated sheets are made by applying an anchor coat to one side of a synthetic resin film such as polyester, which is stretched biaxially in the longitudinal direction and width direction of a long film, or stretched uniaxially only in the longitudinal direction, with or without the printed surface. A thin aluminum layer made of aluminum foil or the like is laminated thereon with a polyolefin layer interposed therebetween, and a heat-sealable resin such as polyolefin is further laminated thereon.

However, since biaxially stretched film has poor tearability, if this film is used in packaging bags filled with liquid or powdery contents, it may spill or break when opened.
There are problems such as staining clothes. For this reason,
In order to ensure the tearability of the bag, laminated sheets based on resin films that have been stretched only in the longitudinal direction are used as bag-making materials for packaging foods in liquid, powder, etc. Often.

However, when using the above-mentioned longitudinally stretched laminated sheet as a bag-making material, this sheet is automatically made into vertical bags, each compartment is filled with filler, and each bag is separated after filling. If you try to use an automatic machine to continuously seal bags,
The operational form (direction, posture, etc.) and flow (sheet feeding direction) of the formed bag are as shown in FIG. 1A, and the seal form is limited to a three-sided seal. By the way, if you follow the flow of the sheet shown in Fig. 1 (a) and apply stickers on all sides, automatic filling will be impossible and manual filling will be required, but this is not practical in terms of manufacturing efficiency, cost, hygiene, etc. It doesn't fit.

In FIG.
3 is a heat-sealed portion, the dashed line D is a direction with good tearability, E is a cutting line of continuous bags, F is an individual bag, and the thick arrow indicates the feeding direction of the sheet A during bag making. Note that FIG. 1B is a plan view of FIG. 1A.

In general, a uniaxially stretched film exhibits good tearability in the same direction D as its stretching direction B. Therefore, when the bag F shown in FIG. As can be seen from this figure, the tear line D showing good unsealability in the bag F is in the longitudinal direction of the bag F, that is, on the side surface.
Therefore, such stick-shaped bags with tear lines D formed on the sides have the disadvantage that it is difficult to remove and handle the filling when it is easily spilled, such as liquid or granular materials. There is.

Incidentally, in the case of a general bag filled with food, if the bag is vertically long, the opening position of this bag should be at the top of the vertically long bag, and the opening direction should be horizontal to the vertically long bag. This has become an established part of daily life customs.

On the other hand, even in the case of a laminated sheet based on a uniaxially stretched film as described above, as shown in FIG. Seal C that can be realized
If steps 1 to C3 are applied in automatic bag making, a tear line D showing good unsealability can be created in each of the horizontally continuous stick-like bags F while automatically making the above-mentioned horizontally continuous stick-like bags F. It is possible to position it orthogonally to the longitudinal direction.

However, in the bag that is automatically and continuously made into the form shown in Figure 2 A above, the sheet A is sent in the direction of the bold line arrow while being made, so the contents are packed into a wide-mouthed bag with an extremely shallow bottom. Since the filling has to be carried out automatically and continuously, the filling tends to spill out, and there are also problems such as the inability to feed the sheet A quickly to deal with this.

Incidentally, in automatic filling, the filling nozzle generally descends into the bag before the opening is sealed and discharges the contents, and the opening is sealed at the same time as this nozzle rises, so the bag's opening is sealed. A stroke space is required for the nozzle to move up and down inside, but this stroke is insufficient in the shallow-bottomed bag shown in FIG. In order to fill the bag without spilling the contents, it is necessary to shorten the filling stroke and change the structure of the filling nozzle to prevent spillage.

In consideration of such a case, it is possible to manually fill the bags that are continuously made in Figure 2 A above, but of course the work efficiency is significantly inferior to automatic filling. This causes problems such as the contents sag, which deteriorates the finish and makes it unsanitary.

For this reason, in order to automatically form such sheet A into continuous bags horizontally as shown in FIG. It is conceivable that the bags could be sent to other countries, but there is a problem in that the bag making and filling machines that can be used would have to be specially designed.

That is, as shown in Fig. 2A, since each bag F is oriented horizontally when viewed as a container,
In particular, when the filler to be filled is liquid, the bag F is stood up; in other words, the laminated sheet as the bag-making material is rotated horizontally (i.e., rotated 90 degrees clockwise in Figure 2 A). It becomes necessary to carry out bag making and filling while transporting the bag in the same direction. In addition, the filling of each bag F manufactured in this manner is as follows:
First, after feeding sheet A intermittently,
This must be done in synchronization with the pauses in intermittent feeding, which limits the bag making and filling equipment that can be used.Furthermore, because it operates intermittently, its workability is inferior to those that operate continuously. It becomes.

Incidentally, the automatic bag making and filling machine places sheet A first.
This is an automatic filling method in which bags are made while being fed vertically (from top to bottom) as shown in Figure A, and the contents are poured into each bag from the top during this bag making process.

Moreover, when the bag is in a continuous form as shown in FIG. 2A, the sealing structure of the bag is limited to the three-sided seal shown in the figure or the sealing mode based on the three-sided seal. In particular, so-called gassho pasting stickers (or back pasting stickers) and envelope pasting stickers are advantageous in that conventional automatic bag making and filling machines can be used to automatically make stick-shaped bags and automatically fill the contents. The disadvantage is that it cannot be done automatically and continuously.

In other words, for bag F in Figure 2A, the gassho sticker or the envelope sticker is attached to the seal portion C1.
This refers to a seal form in which a seal portion C4 shown by a dotted line is formed between and C2 in parallel with them, but if we look at the continuous form of the laminated sheet A and the feeding direction of the sheet A (thick line arrow in the figure), the above-mentioned This is because it is virtually impossible to automatically and continuously form the seal portion C4 on such a sheet A in the feeding direction.

The present invention is a packaging bag made of a laminated sheet based on a uniaxially stretched film as described above, in view of the current state of technology for continuous bag making while automatically filling the contents. This is a bag using a sheet, and in particular, the tear opening is positioned in the narrow width direction of a stick-like vertical bag, and continuous bag making and filling is possible by using gassho pasting and envelope pasting seal forms. The purpose was to provide a method for manufacturing a continuous body of packaging bags.
Its structure consists of applying an anchor coat to one side of a uniaxially stretched resin film that has been stretched only in the width direction, on which an aluminum foil is laminated via a polyolefin layer, or a polyolefin film coated with aluminum is laminated, and then A laminated sheet on which a heat-sealable resin is laminated is formed into a long laminated sheet with a width that matches the width of the packaging bag to be made,
While feeding this long laminated sheet in a direction perpendicular to the stretching direction of this sheet, the heat-sealable resin layers are faced to each other, and the outer edges of the facing sheets are heat-sealed, and the sides perpendicular to the feeding direction are By filling the bag with filler while heat-sealing it in appropriate pitches, it is confirmed that the bag is cut in a direction perpendicular to the feeding direction and that the bag is continuous in the direction perpendicular to the cut direction. This is a characteristic feature.

Next, an example of implementation of the present invention will be explained with reference to the drawings.

FIG. 3 is a cross-sectional view of an example of a laminated sheet used in the present invention. In the figure, 1 is a base sheet made of a high-density polyethylene film stretched in the width direction relative to the longitudinal direction of the film, and 2 is a base sheet made of a high-density polyethylene film stretched in the width direction relative to the longitudinal direction of the film. 3 is an anchor coat layer applied on the printed surface, 4 is an aluminum foil laminated to the anchor coat layer 3 via a polyolefin layer 5, and 6 is the aluminum foil 4.
The polyolefin layer provided on the above constitutes the laminated sheet A1 used in the present invention according to 1 to 6 above.

In the above, the aluminum foil 4 is laminated on the anchor coat layer 3 via the polyolefin layer 5, but the present invention is not limited to this, and a polyolefin film on which aluminum is vapor-deposited is laminated on the anchor coat layer 3. It's okay.

When the laminated sheet A1 configured as described above is cut into a long laminated sheet having a width twice the width of the packaging bag to be made, the laminated sheet A1 configured as described above is vertically That is, it stretches in the longitudinal direction, but
It has the property of not stretching in the width direction, so
When the sheet is fed along its longitudinal direction, for example from top to bottom, and then passed through a packaging machine to form bags and automatically package powdered soup, liquid soup, etc. to form a continuous body of packaging bags, each bag is The direction of the tear line for opening each bag is perpendicular to the feeding direction of the base sheet 1.

That is, in the present invention, an example of a mode in which the laminated sheet A1 is applied to a packaging machine to package soup, etc. is as shown in FIG. Show direction.

Accordingly, in the present invention, as shown in FIG. 4A as an example, while folding the long laminated sheet A1 in half along the feeding direction, first, the tip end in the feeding direction and the opening side along the feeding direction are folded in half. Heat seal the parts h1, h
3, the sheet A1 is formed into a cylindrical shape, and in parallel with this forming step, the compartments of each bag are filled with a filler such as soup from the rear end opening side in the feeding direction of the cylindrical body. Heat-seal h2 the parts facing backward (upward) in appropriate pitches.

By going through such a manufacturing process, the stretching direction B of the base seal A1, the division cutting line E of each bag,
The opening cut line D is in the same direction, and these B,
E, is a vertically long stick-like bag F that is perpendicular to the length direction and feeding direction of the sheet A1, and each bag F is continuous in a direction perpendicular to each of the lines B, E, and D.
It is formed as a continuum of.

Figures 5A and 5B show front views of individual bags F, in which the continuous body of packaging bags formed by the above method is separated at the heat seal h2 portion.
The difference between the one in Figure B and the one in Figure 5 A is that the side edge corresponding to the folded sheet side in Figure 5 A is also heat-sealed.
4.

Figures C and D are bags made from a cylindrical body using the gassho-pasting or envelope-pasting method, in which the sheet A1 is folded from both sides in the feeding direction, and the both sides are overlapped and heat-sealed. Heat-seal h1 and h3 to make a cylinder shape, then heat-seal h2 in the same way as the bag in Figure 5 A and cut it at cutting line E. In Figure 5 D, sheet A1 is folded in half in the feeding direction. and heat seal the tip and center.
1, h3 to form a cylindrical shape is the same as in Figure 5 C, but after heat sealing both sides H4, bags were made, filled and separated in the same manner as in Figure 5 A. When opening the bag F, it can be easily torn in a straight line if it is torn in the direction of the dashed line D, which is perpendicular to the direction in which the base sheet 1 extends.

The present invention is as described above, and the laminated sheet A1 is made of a resin film sheet stretched in the transverse direction with respect to the film feeding direction during manufacturing as the base sheet. This is because a continuous body of packaging bags is formed by cutting the sheets into long laminated sheets, filling them with powdered soup, liquid soup, etc., and packaging them continuously while making bags using conventional automatic packaging machines. , the continuous body of packaging bags to be manufactured is such that the cutting line (continuous part) of each bag and the cutting direction for opening each bag are in the same direction and perpendicular to the feeding direction of the base sheet, and , the above-mentioned cutting line and the tearing direction are in the same direction as the stretching direction of the sheet, and therefore, the vertically long stake-shaped bag having the cutting line and the tearing line is formed as a continuous body continuous in the length direction. It is possible to do so.

This means that conventional machines used to automatically make and fill vertically long stick-shaped packaging bags suitable for storing fillers such as powdered soups and liquid soups can be used to create envelopes. This means that it is possible to continuously manufacture and automatically form and fill packaging bags in the form of pasting or joining hands.

Incidentally, with the bag shown in Figure 1 A, it is possible to automatically make a vertically long stick-like bag by pasting the palms together or pasting envelopes and continuously fill the bag with the contents, but the tear line This is inconvenient for use. Furthermore, the bag shown in FIG. 2A cannot be constructed in a continuous automatic bag manufacturing process in which individual bags are sealed in a gassho-pasted manner or an envelope-pasted manner.

In this regard, according to the method of the present invention, not only bags with a three-sided or four-sided structure, but also stick-like bags with an envelope or gassho structure can be automatically made in a continuous manner in the length direction. In addition, even if it is a stick-like bag with an envelope pasting or gassho pasting structure, continuous bag making is possible because it is possible to automatically fill each bag by letting the contents fall naturally from above while making the bags continuously. and continuous filling can all be easily automated in one process. According to the conventional method, there were problems such as the cutting direction being only vertical and automatic filling being impossible. Moreover, since the tear lines of each bag formed in a continuous body are all formed in the direction across the stick-like bag, it is convenient for handling such as taking out the contents. Therefore, the present invention is extremely useful, especially as a method for manufacturing a continuous stick-like packaging bag for food products.

[Brief explanation of the drawing]

Figure 1A is a front view of an example of a conventional packaging form, Figure 1B is a cross-sectional plan view thereof, Figure 2A is a front view of another example of the conventional packaging form, and Figure 2B is a cross-sectional plan view thereof. , FIG. 3 is a sectional view of an example of a laminated sheet used in the present invention, FIG. 4A is a front view of an example of a continuous packaging bag produced by the method of the present invention, FIG. FIGS. 2A to 2D are front views illustrating the packaging form of individual packaging bags of a continuous packaging bag according to the method of the present invention. 1... Base sheet, 2... Printing, 3... Anchor coat layer, 4... Aluminum foil, 5, 6... Polyolefin layer, A, A1... Laminated sheet, B... Stretching direction, D... Cutting Fissure line, E... Cutting line.

Claims (1)

[Claims] 1 An anchor coat is applied to one side of a uniaxially stretched resin film stretched only in the width direction, and then an aluminum foil is laminated via a polyolefin layer, or a polyolefin film coated with aluminum is laminated, and then heat-sealed on top of that. A long laminated sheet with a laminated resin of different colors is formed into a long laminated sheet with a width matching the width of the packaging bag to be made, and this long laminated sheet is fed in the direction perpendicular to the stretching direction of the sheet. By placing the heat-sealable resin layers facing each other, heat-sealing the outer edges of the facing sheets, and filling the filler while heat-sealing the sides perpendicular to the feeding direction at appropriate pitches, the cutting direction can be adjusted. A method for manufacturing a continuous packaging bag, characterized in that the bags are perpendicular to the feeding direction, and the bags are continuous in a direction perpendicular to the tearing direction.