JPH09169323A - Production method of packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent print ink from being wiped out of a synthetic film, by sticking the synthetic resin sheets to each other on the front face and the rear face of a synthetic resin tube in a simple process. SOLUTION: A synthetic resin tube 22 formed cylindrical and folded flat and wound up, is let out and an adhesive is applied on a printing face made of a transparent synthetic resin film 23 printed on one side face in advance and then the middle of the film 23 is cut off and stuck on the surface of the synthetic resin tube 22 letting out one printing face of the synthetic resin film 23 cut off and the other printing face of the film 23 is turned reversely and stuck to the rear face of the tube 22 letting out the other face of the film 23 of which position is adjusted and cut off against the printing face of the film 23 stuck on the tube surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a packaging bag in which a synthetic resin tube is printed on both sides and used for packaging rice or the like.

[0002]

2. Description of the Related Art Generally, when printing is performed on both sides of a synthetic resin tube packaging bag, both sides of the synthetic resin tube are directly printed with a synthetic resin ink diluted with an organic solvent.

However, when the printed synthetic resin tube is used as a packaging bag for rice or the like, the ink may be scraped off due to friction during stacking and transportation.

Therefore, conventionally, an adhesive is applied to the printing surface of a transparent synthetic resin film having an inner surface printed in advance, and two steps are separately performed on the front surface and the back surface of a plain synthetic resin tube. Synthetic resin film is pasted together so that the printed surface is the inner surface of the synthetic resin film, or the front and back surfaces of a synthetic resin tube with printing on both front and back sides are separated into two steps and transparent A synthetic resin film is stuck to cover the printed surface of the synthetic resin tube.

Also, a synthetic resin tube is filled with rice,
When stacking a sealed packaging bag on a pallet, the packaging bag may slip down due to the elastic force of air sealed with rice in the packaging bag.

As a preventive measure, a small hole is made in the packaging bag in advance or at the time of packaging so that the air in the packaging bag can be released to prevent the collapse of the load.

[0007]

The conventional method for preventing the ink of the printing of the synthetic resin film from being scraped off when the packaging bags are stacked or transported is to use the front and back surfaces of the synthetic resin tube. In addition, since the synthetic resin film is attached separately in two steps, there is a problem in that the adhesion takes time.

[0008] Further, a method of sticking the printing surface of a transparent synthetic resin film having an inner surface printed in advance to the front surface and the back surface of a plain synthetic resin tube is carried out by the position of the printed pattern on the front surface side and the back surface side. Since it is necessary to prevent the printed pattern from being displaced from the position, there is a problem that skill is required in addition to the time and labor required for the bonding in order to perform the position adjustment.

Further, if a small hole is made in the packaging bag to release the air in the packaging bag, insects may enter the packaging bag through the small hole, or rain may occur during transportation of the packaging bag outdoors in rainy weather. There was a problem of soaking in.

The present invention solves such a problem, and a synthetic resin film is attached to the front surface and the back surface of a synthetic resin tube by a simple bonding process so that the printing ink of the synthetic resin film is not scraped off. It is also an object of the present invention to provide a method of manufacturing a packaging bag in which insects and rainwater are prevented from entering the packaging bag through the small holes through which air is released.

[0011]

According to a first aspect of the present invention, a synthetic resin tube formed into a cylindrical shape, folded flat, and wound up is drawn out, and printing is performed on a transparent synthetic resin film which is printed on one side in advance. An adhesive is applied to the surface to cut the center of the synthetic resin film, one printed surface of the cut synthetic resin film is attached to the surface of the synthetic resin tube that is being fed, and the cut synthetic film is formed. The other printing surface of the resin film is reversed, the position is adjusted with respect to the printing surface of the synthetic resin film attached to the surface, and the other printing surface of the cut synthetic resin film is fed out. Characterized by being attached to the back side of the resin tube, printing is done on the synthetic resin film, so that the printing surface becomes the synthetic resin tube side, and the printing surface does not appear on the surface Ink was in so that it is not rubbed off.

According to a second aspect of the present invention, a synthetic resin tube which is formed into a cylindrical shape, is folded flat, is printed on both front and back sides, and is wound up, and is rolled out, and an adhesive is applied to one side of a transparent synthetic resin film. Then, the center of the synthetic resin film is cut, and one adhesive coating surface of the cut synthetic resin film is attached to the surface of the synthetic resin tube that is being fed, and the cut synthetic resin film is The other adhesive application surface is reversed, and the inverted adhesive application surface is attached to the back surface of the synthetic resin tube that is being fed out. It was covered with a resin film to prevent the ink from being scraped off.

According to a third aspect of the present invention, a synthetic resin tube which is formed into a cylindrical shape, is folded flat, is provided with a through hole, and is wound up, is wound up, is printed on one side in advance, and is cut into the synthetic resin tube. An adhesive is applied to the printed surface of the transparent synthetic resin film having a through hole at a position corresponding to the provided through hole except for the vicinity of the through hole, and the center of the synthetic resin film is cut and cut. The through hole of the synthetic resin film was misaligned with the through hole formed in the synthetic resin tube, and a portion of the synthetic resin film where the adhesive was not applied was formed in the synthetic resin tube. The printed surface of the one cut synthetic resin film is attached to the surface of the synthetic resin tube that is being fed out so as to overlap the through hole, and the printed surface of the other cut synthetic resin film is reversed. Then, the position is adjusted with respect to the printing surface of the synthetic resin film attached to the surface, the through hole of the synthetic resin film is out of position with the through hole formed in the synthetic resin tube, and the synthetic resin The back side of the synthetic resin tube which is the feeding side of the other printed surface of the synthetic resin film cut so that the portion of the synthetic resin film not coated with the adhesive overlaps the through hole formed in the synthetic resin tube. The synthetic resin film is printed so that the printed surface is on the synthetic resin tube side, and the printed surface does not appear on the surface so that the ink is not scraped off. In addition, the air inside the synthetic resin tube is discharged to the outside by making the position of the through hole of the synthetic resin tube and the position of the through hole of the synthetic resin film shift. From, insects and rain water was prevented from entering the packaging bag.

According to a fourth aspect of the present invention, a synthetic resin tube which is formed into a cylindrical shape, is flatly folded, is printed on both front and back sides, and has a through hole formed therein and is wound up, is fed out to the synthetic resin tube. A transparent synthetic resin film having a through hole at a position corresponding to the punched through hole is coated with an adhesive on one surface except the vicinity of the through hole, and the center of the synthetic resin film is cut and cut. The through hole of the synthetic resin film was misaligned with the through hole formed in the synthetic resin tube, and a portion of the synthetic resin film where the adhesive was not applied was formed in the synthetic resin tube. The adhesive application surface of one of the cut synthetic resin films is attached to the surface of the synthetic resin tube being fed so as to overlap the through hole, and the other adhesive application of the cut synthetic resin film is applied. And the through hole of the synthetic resin film is misaligned with the through hole formed in the synthetic resin tube, and the synthetic resin film is not coated with the adhesive. It is characterized in that the inverted adhesive coating surface of the other synthetic resin film cut so as to overlap the formed through hole is attached to the back surface of the feeding synthetic resin tube.

[0015]

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

FIG. 1 is a perspective view showing an example of an apparatus used for carrying out the method of the present invention. A synthetic resin tube feeding shaft 1 is provided on the lower left side of the figure, and an upper part thereof is provided thereabove. , The guide shaft 2 is provided in parallel.

On the right side of the synthetic resin tube feeding shaft 1 and the guide shaft 2, there is a downward triangular reversing plate 3 having its lower apex, and both ends of the reversing plate 3 extend and contract downward. It is supported by rods 4 and 4.

A guide roll 5 is provided above the reversal plate 3, and another guide roll 6 is provided at a position slightly separated to the right of the guide roll 5.

A receiving roll 7 having a large diameter is provided above the guide roll 6, and a bonding roll 8 is pressed onto the upper side of the receiving roll 7 by a spring or the like (not shown).

On the upper left side of the laminating roll 8, a cylindrical cutting device 9 is provided in a fixed state. At the center of the lengthwise direction of the cylindrical cutter 9, as shown in the enlarged perspective view of FIG. 2, two cutting blades 10 are fixed upward at an interval of approximately 20 mm.

As shown in FIG. 1, on the upper right side of the cutter 9, a duct-shaped hot air dryer 1 extending long rightward is provided.
1 is provided.

A synthetic resin film feeding port 12 is opened at the left end of the hot air dryer 11, the right end is bent downward and its lower end is opened, and a large number of guides are provided inside the hot air dryer 11. The rolls 13 are arranged side by side so that hot air at 60 to 90 ° C. flows at an amount of about 120 m ² / min.

Below the left side of the hot air dryer 11, there is a packaging bag winding shaft 14, and an induction roll 15 is provided on the upper left side thereof. The packaging bag winding shaft 14 is rotated in a counterclockwise direction by a motor (not shown) to generate a driving force for feeding and winding a synthetic resin tube or a synthetic resin film described later.

Further, below the center of the hot air dryer 11, there is a synthetic resin film feeding shaft 16, and an adhesive agent storage pan 17 is provided on the right side thereof.

The adhesive reservoir pan 17 contains an appropriate amount of adhesive such as urethane adhesive, and the adhesive reservoir pan 17 is provided in the adhesive reservoir pan 17 above the adhesive reservoir pan 17. A coating roll 18 is provided so that the lower portion is dipped in the adhesive.

The coating roll 18 has a mesh shape of 100 to 175 mesh and 30 to 50 μm.
A pressing roll 19 is pressed onto the above by a spring or the like (not shown). An induction roll 20 is provided above the synthetic resin film feeding shaft 16 described above, and an induction roll 21 is provided above the pressing roll 19.

Next, an embodiment for carrying out the method of the present invention using the apparatus shown in FIG. 1 will be described.

The synthetic resin tube feed-out shaft 1 is made of low-density polyethylene or the like having a thickness of about 80 μ and formed into a long cylindrical shape, which is the main body of the packaging bag, and is flatly folded to form a folded width of about 340 mm. The resin tube 22 is rolled and attached.

On the other hand, the synthetic resin film feeding shaft 16 has about 2 times the width of the synthetic resin tube 22 folded up.
A transparent synthetic resin film 23 such as low-density polyethylene having a width of about 670 mm and a thickness of about 30 μ, which is almost double the length, is wound in a roll shape and mounted. Add an appropriate amount of adhesive. In the case of carrying out the invention of claim 1, it is desired to display the design to be displayed on the surface of the packaging bag on the front half of the inner side when the synthetic resin film 23 is wound in a roll shape, and on the back surface of the packaging bag. When the pattern is wound in a roll shape on the synthetic resin film 23, the other half on the inner surface side is preprinted with a synthetic resin ink, and the synthetic resin film 23 wound in a roll shape is made of synthetic resin. Film feeding shaft 16
Attach to

Then, the synthetic resin film 23 is fed out from the synthetic resin film feeding shaft 16, and the guide roll 20,
After being guided along the upper side of 21, the synthetic resin film 2 is passed through between the coating roll 18 and the pressing roll 19.
The printed surface of 3 is on the lower side, and the adhesive in the adhesive storage pan 17 is applied to the printed surface of the synthetic resin film 23 by the application roll 18.

The synthetic resin film 23 with the adhesive applied to the printing surface enters the inside of the hot-air dryer 11 through the opening at the lower right end of the hot-air dryer 11, and 100-150 m / min above the many induction rolls 13. The organic solvent in the adhesive is scattered by the hot air while moving to the left in FIG. 1 at a moderate speed.

The synthetic resin film 23 that has passed through the inside of the hot air dryer 11 goes out of the hot air dryer 11 through the synthetic resin film feeding port 12 and moves toward the cutter 9.

The synthetic resin film 23 in a state of being out of the hot air dryer 11 through the synthetic resin film feeding port 12
As shown in FIGS. 2 and 3, a print surface 24 of a design to be displayed on the front surface of the packaging bag on the front side and a print surface 25 of a design to be displayed on the back surface of the packaging bag on the other side are on the top surface. And the synthetic resin film 23 and the printing surfaces 24, 2
The adhesive 26 (see FIG. 3) is applied over the upper surface of the sheet 5.

The synthetic resin film 23 having the adhesive 26 applied to the printing surface thereof moves onto the cutting device 9,
The center of the synthetic resin film 23 is cut out at intervals of 20 mm by the two cutting blades 10.

The cut-out film 27 having a width of 20 mm is taken up by a front take-up roll (not shown) and then discarded. The reason why the center of the synthetic resin film 23 is cut out in this way is that it serves as a means for positioning in the width direction when sticking to the synthetic resin tube 22, which will be described later, and for preventing wrinkles.

The front side synthetic resin film 23a (see FIG. 2) after the center is cut out has a width of about 325 mm, which is slightly narrower than half the width 670 mm of the original synthetic resin film 23. As shown in, the printing surface 24 and the adhesive 26 are on the lower side and move toward between the receiving roll 7 and the bonding roll 8.

The synthetic resin film 23b on the other side after cutting out the center is also the width 6 of the original synthetic resin film 23.
The width is about 325 mm, which is slightly narrower than half of 70 mm, and the left oblique side of the triangular reversing plate 3 is reversed by 45 degrees to the back side of the reversing plate 3, and the right hypotenuse of the reversing plate 3 is rotated again by 45 degrees. The sheet is turned over, goes out to the front side of the turnover plate 3, and moves toward between the receiving roll 7 and the laminating roll 8. At this time, the synthetic resin film 23b has the printing surface 25 and the adhesive 26 on the upper side, as shown in FIG.

On the other hand, the roll-shaped synthetic resin tube 22 attached to the synthetic resin tube feeding shaft 1 is not printed, and is fed from the synthetic resin tube feeding shaft 1 and the guide shaft 2 After being guided along the upper side of the sheet, it is moved between the receiving roll 7 and the laminating roll 8.

On the surface of the synthetic resin tube 22 that has moved between the receiving roll 7 and the laminating roll 8, a synthetic resin film 23a is superposed from above, and at the same time, on the back surface of the synthetic resin tube 22. Synthetic resin film 23
When b is overlapped, the synthetic resin tube 22 and the synthetic resin films 23a and 23b are pressed against each other by the receiving roll 7 and the laminating roll 8. As shown in FIG. Is attached to the surface of the synthetic resin tube 22 with an adhesive 26 in the direction of the synthetic resin tube 22.
3b is attached to the back surface of the synthetic resin tube 22 with an adhesive 26 so that the printed surface 25 faces the synthetic resin tube 22.

Printing surface 2 on the surface of the synthetic resin tube 22
In order to match the position of the design of the printed surface 25 on the back surface of the synthetic resin tube 22 with the position of the design of FIG.
Adjusting the position of the reversal plate 3 by expanding and contracting the support rods 4 and 4 of FIG. 2, the distance from the reversal plate 3 to the bonding roll 8 is
It should be an integral multiple of the pitch of the printing surface 25.

In this way, the packaging bag 28 in which the synthetic resin films 23a and 23b are attached to the front and back of the synthetic resin tube 22 passes below the guide roll 6 and above the guide roll 15 in FIG. The packaging bag winding shaft 14 is wound into a roll.

The packaging bag 28 wound around the packaging bag winding shaft 14 in a roll shape is removed from the packaging bag winding shaft 14 and cut into a required length, and one end thereof is brought into close contact with the rice from the opening on the other end side. Put and seal.

Since the synthetic resin films 23a and 23b attached to the front and back of the synthetic resin tube 22 are transparent, the front and back printing surfaces 24 and 25 of the synthetic resin tube 22 are transparent.
Can be seen as a pattern of the synthetic resin tube 22 through the synthetic resin films 23a and 23b, and since the synthetic resin films 23a and 23b protect the ink on the printing surfaces 24 and 25, the packaging bags are stacked. The ink on the printing surfaces 24 and 25 is not scraped off during transportation or transportation.

In the case of carrying out the invention of claim 2, a front surface and a back surface of the synthetic resin tube 22 are preliminarily printed with a pattern print surface 24 on the front surface and a print surface 25 on the back pattern as shown in FIG. The synthetic resin tube 22 on which the printing surfaces 24 and 25 are printed is wound into a roll and mounted on the synthetic resin tube feeding shaft 1 shown in FIG. A transparent synthetic resin film 23, which is not subjected to the above, is wound in a roll shape.

Then, the synthetic resin film 23 is fed out from the synthetic resin film feeding shaft 16 shown in FIG. 1, an adhesive is applied to one side of the synthetic resin film 23 by a coating roll 18, and then dried by a hot air dryer 11. Out from the synthetic resin film feeding port 12 to the outside of the hot air dryer 11,
As shown in FIG. 7, the center of the synthetic resin film 23 is cut out by the cutting blade 10 of the cutting device 9, and the synthetic resin film 23a on the front side after the center is cut out is synthesized by the roll 7 and the bonding roll 8. It is attached to the surface of the resin tube 22.

Further, the synthetic resin film 23b on the other side after the center is cut out is reversed by the reversing plate 3, and then it is attached to the back surface of the synthetic resin tube 22 by the roll 7 and the laminating roll 8. At this time, it is not necessary to adjust the position of the reversal plate 3.

As a result, the printing surfaces 24 and 25 provided on the front and back of the synthetic resin tube 22 are protected by the transparent synthetic resin films 23a and 23b, and when the packaging bags are stacked or transported, 25 ink is not scraped off.

When carrying out the invention of claim 3, as shown in FIGS. 8, 10 and 13, one side in the longitudinal direction of the synthetic resin tube 22 which is formed into a long cylindrical shape and is flatly folded ( In the embodiment of FIG. 8, on the other side) from the edge, for example 5
A roll shape is formed by piercing through holes 29 having a diameter of 1.5 mm penetrating from the front surface to the back surface of the flatly folded synthetic resin tube 22 at a distance of 0 mm at intervals of 36 mm pitch or the like along the side edge. Wrap it around and wrap it in a synthetic resin tube 2
2 is attached to the synthetic resin tube feeding shaft 1.

As shown in FIG. 9, the synthetic resin film 23 is, for example, 35 mm apart on both sides from the longitudinal centerline of the synthetic resin film 23 at intervals of 36 mm pitch along the longitudinal centerline. A through hole 30 having a diameter of 3 mm is formed, and a pattern to be displayed on the surface of the packaging bag is to be displayed on the front half of the inner surface side when the synthetic resin film 23 is wound into a roll and on the back surface of the packaging bag. When the pattern is wound in a roll shape on the synthetic resin film 23, it is preliminarily printed with synthetic resin ink on the other half on the inner side when avoiding the vicinity of the longitudinal position where the through holes 30 are formed. In advance, the synthetic resin film 23 wound in a roll shape is mounted on the synthetic resin film feeding shaft 16.

Further, as the coating roll 18, there is used a coating roll 18 provided with grooves 31 and 31 having a width of about 10 mm on both sides at positions 35 mm apart on both sides from the center in the length direction. Then, the synthetic resin film 23 is delivered from the synthetic resin film delivery shaft 16 shown in FIG.
When it is passed between the pressing roll 19 and the pressing roll 19, since the coating roll 18 is provided with the grooves 31 and 31, it is made of synthetic resin except in the vicinity of the longitudinal position where the through holes 30 and 30 are formed. An adhesive is applied to the printed surface of the film 23.

This synthetic resin film 23 enters the inside of the hot air dryer 11 through the opening at the lower right end of the hot air dryer 11, and after the organic solvent is scattered by the hot air, the synthetic resin film 23 shown in FIG. It goes out of the hot air dryer 11 through the mouth 12 and is cut out at a distance of 20 mm by the two cutting blades 10 at the center. As a result, the through holes 30, 30
Is 2 from the cut edge of the synthetic resin film 23.
Synthetic resin films 23a and 23b at positions 5 mm apart
Will be lined up in the longitudinal direction.

The synthetic resin film 23a on the front side
As shown in FIGS. 10 and 12, the printing surface 24 and the adhesive 2
6 is on the lower side, and the groove 31 of the coating roll 18 shown in FIG.
10 is moved to a position between the receiving roll 7 and the laminating roll 8 in FIG. 8 with the portion 32 where the adhesive is not applied on the left side in FIGS. 10 and 12, and the synthetic resin film 23b on the other side is moved. It is reversed by the reversing plate 3, and
As shown in, the printing surface 25 and the adhesive 26 are on the upper side,
In the state where the portion 33 where the adhesive is not applied due to the groove 31 of the application roll 18 shown in FIG. 9 is on the left side of FIG. 10 and FIG. 14, it moves toward between the receiving roll 7 and the bonding roll 8 of FIG. It will be.

As shown in FIG. 10, the synthetic resin tube 22 fed from the synthetic resin tube feeding shaft 1 in FIG. 8 has the synthetic resin film 23a in the above-mentioned state.
And the synthetic resin film 23b, and the synthetic resin film 23a, the synthetic resin tube 22, and the synthetic resin film 23b are pressed against each other by the receiving roll 7 and the laminating roll 8 of FIG. As shown in FIG. 11 and FIG. 15, the synthetic resin film 23a is attached to the surface of the synthetic resin tube 22 with the printing surface 24 and the adhesive 26 on the lower side. The synthetic resin film 23b is attached so that the printing surface 25 and the adhesive 26 are on the upper side. In this case,
The support rods 4 and 4 are expanded and contracted to adjust the position of the reversal plate 3, and as shown in FIG. 11, the position of the synthetic resin tube 22 is adjusted with respect to the position of the pattern on the printed surface 24 of the surface of the synthetic resin tube 22. As shown in FIG. 15, the position 32 of the synthetic resin film 23a where the adhesive is not applied is synthetic as shown in FIG. Resin tube 22
The through hole 30 of the synthetic resin film 23a is displaced from the synthetic resin through hole 29, though it overlaps the upper through hole 29 of the.

The portion 33 of the synthetic resin film 23b to which the adhesive is not applied overlaps the through hole 29 on the lower side of the synthetic resin tube 22.
The through hole 30 is displaced from the through hole 29 made of synthetic resin.

For this reason, the through holes 29 and 30 are communicated with each other in a displaced state, and the air in the synthetic resin tube 22 can escape to the outside through the 29 and 30. Since the penetration hole 29 is a small hole having a diameter of about 1.5 mm, the rice filled in the synthetic resin tube 22 does not spill out to the outside.
Insects do not invade from the outside.

Therefore, the synthetic resin film 23a attached to the front and back of the synthetic resin tube 22 shown in FIGS.
Since 23b is transparent, the printed surfaces 24, 25 on the front and back of the synthetic resin tube 22 are made of synthetic resin films 23a, 2
It can be seen as a pattern of the synthetic resin tube 22 through 3b, and the synthetic resin films 23a and 23b.
Protects the ink on the printing surfaces 24 and 25, so the ink on the printing surfaces 24 and 25 is not scraped off when the packaging bags are stacked or transported, and the air is not sealed in the packaging bags. , Rice inside does not spill, and insects and rainwater do not enter the packaging bag.

In the case of carrying out the invention of claim 4, FIG.
In the same manner as in the above case, the front surface and the back surface of the synthetic resin tube 22 are preliminarily printed with the design print surface 24 on the front surface and the print surface 25 on the back surface with the design, and are made of synthetic resin which is flatly folded as shown in FIG. A tube having a through hole 29 formed in one side in the longitudinal direction of the tube 22 is wound into a roll, and this is made into a synthetic resin tube 22.
Is attached to the synthetic resin tube feeding shaft 1.

As the synthetic resin film 23, through holes 30 are formed along both sides of the center line in the longitudinal direction as shown in FIG. 9, but a simple transparent synthetic resin film 23 without printing is formed. Is wound on a roll and mounted on a synthetic resin film feeding shaft 16.

When the operation described with reference to FIGS. 8 to 15 is performed, the printed surfaces 24 and 25 provided on the front and back of the synthetic resin tube 22 are transparent synthetic resin film 23.
Protected by a and 23b, the through holes 29 and 30 communicate with each other in a displaced state, and the air inside the synthetic resin tube 22 escapes to the outside, but rice does not spill outside and insects and rainwater do not enter. You can make a packaging bag. When the direction of the synthetic resin tube 22 is reversed, the through hole 30 provided in the synthetic resin film 23 is provided along the outer line of the film 23.

[0060]

According to the invention of claim 1, the synthetic resin film can be attached to the front and back of the synthetic resin tube in one step, and the printed patterns of the front and back synthetic resin films can be easily aligned. Therefore, there is an effect that it can be easily pasted without any trouble. And the pattern of the printed surface of the synthetic resin film can be seen as the pattern of the synthetic resin tube through the transparent synthetic resin film. Since the synthetic resin film protects the printed surface ink, the packaging bags were stacked. There is an effect that the ink on the printed surface is not scraped off at the time of transportation or transportation.

According to the second aspect of the present invention, the front and back printing surfaces of the synthetic resin tube are covered with transparent synthetic resin films, respectively, so that the ink is not scraped off, and the front and back of the synthetic resin tube are covered with the synthetic resin. The work of sticking the film-making film can be easily performed in one step.

According to the third aspect of the invention, since the printed patterns of the synthetic resin film attached to the front and back of the synthetic resin tube can be easily aligned, the synthetic resin film can be easily attached without any trouble. The pattern on the printed surface of the film can be seen as a pattern on the tube made of synthetic resin through the transparent synthetic resin film. The synthetic resin film protects the ink on the printed surface, so when packaging bags are stacked or transported. Sometimes the ink on the printed surface is not scraped off, and the air in the synthetic resin tube is discharged to the outside, but there is the effect that insects and rainwater do not enter the packaging bag from the outside.

According to the fourth aspect of the present invention, the front and back printing surfaces of the synthetic resin tube can be covered with transparent synthetic resin films to prevent the ink from being scraped off.
The air in the synthetic resin tube is discharged to the outside, but it has the effect of preventing insects and rainwater from entering the packaging bag from the outside.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an apparatus used to carry out the method of the present invention.

FIG. 2 is an enlarged perspective view showing a main part of an embodiment of the invention of claim 1;

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

5 is a sectional view taken along line VV of FIG.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is an enlarged perspective view showing the essential parts of the second embodiment of the invention.

FIG. 8 is an enlarged perspective view showing a main part of an embodiment of the invention of claim 3;

FIG. 9 is a perspective view showing another main part of the embodiment of the invention of claim 3;

FIG. 10 is a perspective view of a synthetic resin film and a synthetic resin tube used in the invention of claim 3;

FIG. 11 is a cross-sectional view of a synthetic resin tube after the final step of the invention of claim 3 is completed.

FIG. 12 is a sectional view taken along line XII-XII of FIG. 10;

13 is a sectional view taken along line XIII-XIII in FIG.

14 is a sectional view taken along line XIV-XIV of FIG.

15 is a sectional view taken along line XV-XV in FIG.

[Explanation of symbols]

 22 Synthetic resin tube 23 Synthetic resin film 23a Synthetic resin film 23b Synthetic resin film 24 Printing surface 25 Printing surface 26 Adhesive 28 Packaging bag 29 Through hole 30 Through hole 32 Non-adhesive location 33 Adhesive application Not done

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI technical display location // B29C 65/48 7639-4F B29C 65/48 B29L 22:00 (72) Inventor Hiromichi Inagaki Aichi 143, 1 Maeda-my, Inuyama, Ibaraki Prefecture

Claims (4)

[Claims] 1. A synthetic resin tube, which is formed into a cylindrical shape and is folded flat and wound up, is fed out, and an adhesive is applied to the printed surface of a transparent synthetic resin film having one side previously printed, to produce the synthetic resin. Cut the center of the film made of plastic, affix one printed surface of the cut synthetic resin film to the surface of the synthetic resin tube that is being fed, and reverse the other printed surface of the cut synthetic resin film. Characterized in that the printing surface of the synthetic resin film attached to the front surface is adjusted in position and the other printing surface of the cut synthetic resin film is attached to the back surface of the feeding synthetic resin tube. And a method of manufacturing a packaging bag. 2. A synthetic resin tube which is formed into a cylindrical shape, is folded flat, is printed on both front and back sides, and is wound up, and is rolled out. An adhesive is applied to one side of a transparent synthetic resin film to form the synthetic resin. Cut the center of the synthetic resin film, affix one adhesive application surface of the cut synthetic resin film to the surface of the synthetic resin tube that is being fed, and apply the other adhesive agent of the cut synthetic resin film A method of manufacturing a packaging bag, which comprises inverting the surface and adhering the inverted adhesive-coated surface to the back surface of the drawn synthetic resin tube. 3. A synthetic resin tube which is formed into a cylindrical shape, folds flat and pierces through holes, and is wound up,
Print on one side in advance and apply adhesive to the printed surface except the vicinity of the through hole of the transparent synthetic resin film in which the through hole is formed at a position corresponding to the through hole formed in the synthetic resin tube. Then, the center of the synthetic resin film is cut, and the cut through hole of the synthetic resin film is misaligned with the through hole formed in the synthetic resin tube, and an adhesive for the synthetic resin film is formed. As the non-applied portion overlaps the through hole formed in the synthetic resin tube, the printed surface of the cut synthetic resin film is affixed to the surface of the synthetic resin tube that is being fed out, The printed surface of the other cut synthetic resin film is reversed, and the position is adjusted with respect to the printed surface of the synthetic resin film attached to the surface, and the through holes of the synthetic resin film have the through holes of the synthetic resin film. Made of the synthetic resin cut so that the position of the synthetic resin film that is not aligned with the through hole formed in the tube overlaps the through hole formed in the synthetic resin tube. A method for producing a packaging bag, characterized in that the other printing surface of the film is attached to the back surface of the synthetic resin tube that has been drawn out. 4. A synthetic resin tube which is formed into a cylindrical shape, is flatly folded, is printed on both front and back sides, and has a through hole formed therein, and is wound up, and the synthetic resin tube is drawn out, and the through hole formed in the synthetic resin tube is drawn out. A transparent synthetic resin film having a through hole at a position corresponding to the hole is coated with an adhesive on one surface except the vicinity of the through hole, the center of the synthetic resin film is cut, and the cut synthetic resin film is cut. The through hole of the film is misaligned with the through hole formed in the synthetic resin tube, and the portion of the synthetic resin film where the adhesive is not applied overlaps the through hole formed in the synthetic resin tube. Then, the adhesive application surface of the cut one synthetic resin film is attached to the surface of the synthetic resin tube that is being fed out, the other adhesive application surface of the cut synthetic resin film is reversed, Synthetic tree The through hole of the oil film is misaligned with the through hole formed in the synthetic resin tube, and the portion of the synthetic resin film where the adhesive is not applied is the through hole formed in the synthetic resin tube. A method of manufacturing a packaging bag, characterized in that the inverted adhesive application surface of the other synthetic resin film cut so as to overlap is attached to the back surface of the synthetic resin tube being fed out.