JPH0999502A - Gussette bag and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply printing to both surfaces of a gusset bag and the folded part of a gusset by applying corona discharge treatment for printing at a definite interval to apply printing to the part subjected to corona discharge treatment and applying heat fusion for forming a bottom to the part of a corona discharge untreated part. SOLUTION: The plastic film tube from an inflation molding machine is bundled and folded double to be flattened to form a flattened film 2. Subsequently, corona discharge treatment is applied to both surfaces of the flattened plastic film 2 by a corona discharge treatment machine 4 at a definite interval to divide the film 2 into corona treatment surface 5 and a corona non-discharge surface 5'. Subsequently, the surfaces of the films are printed by printing cylinders 6, 6' and reversed to apply printing to the rear surfaces of the films. At this time, on the surface of the printing cylinders 6, 6', the length of the corona discharge treatment surface 5 of the flat film 2 is set to a printing surface and the length of the non-corona discharge treatment surface 5' is set to a non-printing surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gusset bag obtained from a plastic film tube by an inflation method and a method for making the gusset bag.

[0002]

2. Description of the Related Art A gusset bag in which a gusset is formed on both sides from a plastic tube by an inflation method is a well-known packaging bag, and the portion to be the bottom of this gusset bag is sealed by heat fusion. Various prints are made on both sides of the gusset bag, but the gusset bag with prints on the folds of the gusset on both sides is not yet seen.

[0003]

In the conventional gusset bag, the fold portion of the gusset is not printed in order to improve the fixing property of the printing ink when printing is performed on the surface of the plastic film forming the gusset bag. In addition, the film surface must be subjected to corona discharge treatment before printing, but the film surfaces subjected to corona discharge treatment are not effective for heat fusion. Therefore, the folded part of the gusset is not printed, and due to heat fusion, corona discharge treatment is not applied to this part, and only the part except the part that should be the gusset on both sides of the bag body is removed. It was printed after corona discharge treatment.

However, in general, the printing of the surface of the bag body has not only the function of displaying necessary items such as displaying contents, but also the function of advertising, advertising, etc., and therefore, the gusset on both sides of the gusset bag can be printed. It has become desirable to print necessary contents, advertisements, advertisements, and the like on the folding section as well. In view of this point, the present invention has been made to provide a gusset bag printed by performing corona discharge treatment on the folded portion of the gusset by a plastic film tube by inflation and a method for manufacturing the bag. It was

[0005]

In order to achieve the above-mentioned object, the present invention uses a flat plastic film tube 2 obtained by flattening a plastic film tube 1 produced by an inflation method, and a gusset 14 is formed on both sides of the flat plastic film tube 2. One end 24 in the direction is opened, and the other end 25 is heat-sealed to the entire width including the folded portion 15 of the gusset 14.
9 to form a bottom portion 20 and this heat fusion 19 is applied to the bottom portion 20.
Both sides 26 of the marked portion and the folded portion 15 of the gusset 14 are heat-sealed 19 without corona discharge treatment, and the both sides 27 and the gusset between the bottom portion 20 and the opened one end 24. The folded portion 15 of 14 is a gazette bag on which corona discharge treatment is applied and printing 13 is applied.

Further, in the bag making method of the gusset bag, corona discharge treatment is performed at regular intervals in the longitudinal direction on both sides 3 and 3'of the flat plastic film tube 2 obtained by flattening the plastic film tube 1 by the inflation method. After that, printing 13 is applied to the corona discharge treated surface 5, then gussets 14 are formed on both sides of the flat plastic film tube 2, and then the flat plastic film tube 2 subjected to the gusset 14 is subjected to non-corona discharge treatment. Both sides 27 and the gusset 1 of the bag obtained by heat-sealing 19 the portion of the surface 5'between the end portions 18 to 18 'to form the bottom portion 20 and cutting the bottom portion at regular intervals.
4 is printed on the folding part 15 and the bottom part 2 of the bag.
The entire width including the folded portion 15 of the gusset 14 which should be zero is heat-sealed 19, and the one end 24 is in an open state.

In the present invention, as an example for performing the corona discharge treatment on both surfaces of the flat plastic film tube 2 at regular intervals, for printing performed on the corona discharge treated surface after the corona discharge treatment. It is preferable that the rotation of the printing cylinder is detected by a sensor, and the energization of the corona discharge electrode is stopped.

In principle, the production of the gusset bag according to the present invention is carried out in a series of continuous steps starting from the inflation molding machine until it is cut into individual gusset bags. As a point, intermittent treatment and printing of corona discharge, and the flat plastic film tube on which the gusset is formed may be temporarily wound, and heat-sealed and cut at the destination of the gusset bag for use. .

In the present invention, both sides of the flat plastic film tube are subjected to corona discharge treatment at regular intervals, and only this corona discharge treated surface is printed, and the non-corona discharge treated portion is formed intermittently. Since it is necessary to perform heat fusion, it is preferable to correlate the discharge and the stop thereof with the next step, that is, printing, even in corona discharge. For example, as shown in FIGS. The contactless sensor sensing piece 10 is provided on the drive gear 9 that drives the shaft 8 of 6, while the contactless sensor 11 is provided at a position corresponding to the contactless sensor sensing piece 10.
The signal from the contactless sensor 11 is converted into a signal for energizing and stopping the corona discharge electrode, or a corona discharge blocker is provided between the flat plastic film tube and the corona discharge electrode. It is carried out by converting to a signal of a dislocation for causing corona discharge due to dislocation or for blocking, but it may be carried out by any other means in order to carry out these corona discharges at regular intervals. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a process diagram for explaining an example of the present invention, FIG. 2 is a plan view of a flat plastic film tube subjected to corona discharge treatment, and FIG.
6 is a plan view of the flat plastic film tube of FIG. 4 which is printed, FIG. 4 is a vertical sectional side view taken along the line AA ′ of FIG. 3, FIG. 5 is a plan view showing an example of the implementation of the gusset bag according to the present invention, and FIG. Is a vertical side view taken along the line AA ′ of FIG.
FIG. 7 is a vertical sectional side view taken along the line BB ′ of FIG. 5, FIG. 8 is a side view of a printing cylinder portion for explaining an example of intermittently performing corona discharge, and FIG. 9 is AA ′ of FIG. It is a vertical side view in a line.

In FIG. 1, reference numeral 1 denotes a plastic film tube from an inflation molding machine, which is bundled and flattened into two folds to form a flat plastic film tube 2.

Next, the flat plastic film 2 is subjected to corona discharge treatment on both sides 3 and 3'at regular intervals by a corona discharge treatment machine 4 to be divided into a corona discharge treated surface 5 and a non-corona discharge treated surface 5 '. . This is shown in FIG. FIG. 8 shows an example in which the corona discharge treated surface 5 and the non-corona discharge treated surface 5'are separately processed on both sides 3 and 3 '.
9 and FIG. 9, 6 is a printing cylinder for printing on one of the both surfaces 3, 3 ′ of the flat plastic film 2, for example, the surface 3, and 8 is a shaft of the printing cylinder 6, Reference numeral 9 is a drive gear for driving the shaft 8. Reference numeral 10 is a non-contact sensor detection piece attached to the side surface of the drive gear 9, and 11 is a non-contact sensor. This non-contact sensor sensing piece 10
For example, the drive gear 9 has a circular shape with a cutout 12.
With the rotation of the contactless sensor 11 and the contactless sensor sensing piece 10, the contactless sensor 1 and the contactless sensor sensing piece 10 face each other while the contactless sensor 11 and the contactless sensor sensing piece 10 face each other.
1 instructs the corona discharge processor 4 to apply corona discharge, and the contactless sensor 11 causes the contactless sensor sensing piece 1
While facing the notch 12 of 0, the contactless sensor 1
1 may be set to instruct the corona discharge processor 4 to stop the corona discharge.

The flat plastic film 2 on which the front and back surfaces 3, 3'has been subjected to corona discharge treatment at regular intervals in this manner is then printed 13 on the front and back surfaces 3, 3 '. This print 13 is shown in the drawing as a print cylinder 6,
6'prints 13 on the front side 3 and then reverses it and prints on the back side 3'by the print cylinders 7, 7 ', which is the case of two colors and if the number of colors increases,
The number of print cylinders will increase accordingly. As for the surface of this printing cylinder, the length of the corona discharge treated surface 5 of the flat plastic film tube 2 may be the printed surface, and the length of the non-corona discharge treated surface 5 ′ may be the non-printed surface.

At this time, the flat plastic film 2 is moved and the printing cylinder is rotated so that the printing 13 is performed only on the corona discharge treated surface 5 of the flat plastic film 2 and not printed on the non-corona discharge treated surface 5 '. Must be tuned. For this purpose, the position of the contactless sensor sensing piece 10 on the circumference of the printing cylinder 6 is the printing surface of the printing cylinder 6, and the contactless sensor sensing piece 1
By making the position where the notch 12 of 0 occupies on the circumference of the printing cylinder 6 the non-printing surface, the printing 13 is applied only to the corona discharge treated surface 5 and the non-corona discharge treated surface 5 ′ is not printed. To be The printing cylinder 6 ',
Since 7 and 7'are driven and rotated in synchronization with the printing cylinder 6, the printing surface and the non-printing surface of the flat plastic film 2 are formed in the same manner as the printing cylinder 6.

This printing surface may be applied to the entire surface of the front and back surfaces 3 and 3'excluding the non-corona discharge treated surface 5 ', but the formation of the gusset 14 to be applied later forms the folding portion 15. As shown in FIG. 4, the front surface 3 is a part of the left side of the figure, and the back surface 3 ′ is a right part of the figure. It is necessary to form the printing surface of the printing cylinder by allocating the printing form of the both surfaces 27 and the folding portion 15 of the gusset 14.

In this way, after the printing 13 is applied to both surfaces 3, 3'of the flat plastic film tube 2, the folding portions 15 on both sides are folded to form the gusset 14, which is a normal gusset. The forming device 16 may be used.

The flat plastic film tube 2 on which the gusset 14 is formed is then subjected to the non-corona discharge treated surface 5'on both sides 26 and the gusset 14 by the heat fusion device 17.
At the portion to be the folded portion 15 of the flat plastic film tube 2, heat is fusion-bonded 19 between the end portion 18 and the end portion 18 ′ of the flat plastic film tube 2, and this heat-fusion portion 19 becomes the bottom portion 20.

Next, the flat plastic film tube 2 is cut by a cutter 21 along a cutting line 22 to form a gusset bag 23.

[0019]

In the gusset bag according to the present invention, it has been impossible in the past to print on the folded portion of the gusset by heat fusion for forming the bottom portion, but corona discharge treatment for printing is performed at regular intervals. The part of the corona discharge treatment is applied to printing and the part of the non-corona discharge treatment is heat-sealed to form the bottom, so that the printed part is not heat-sealed. By heat-sealing only the part, it is not affected by the heat-sealing strength at all, and it is easy and cheap to make a gusset bag with arbitrary printing on both sides of the gusset bag as well as the folded part of the gusset. It has been obtained.

[Brief description of drawings]

FIG. 1 is a process drawing for explaining an example of an embodiment of the present invention.

FIG. 2 is a plan view of a flat plastic film tube subjected to corona discharge treatment.

FIG. 3 is a plan view of the flat plastic film tube of FIG. 2 which is printed.

FIG. 4 is a vertical sectional side view taken along the line AA ′ of FIG.

FIG. 5 is a plan view showing an example of implementation of the gusset bag according to the present invention.

6 is a vertical sectional side view taken along the line AA ′ in FIG.

7 is a vertical sectional side view taken along the line BB ′ of FIG.

FIG. 8 is a side view of a printing cylinder unit for explaining an example of intermittently performing corona discharge.

9 is a vertical cross-sectional side view taken along the line AA ′ of FIG.

[Explanation of symbols]

 1 plastic film tube 2 flat plastic film tube 3 surface of flat plastic film tube 3'back surface of flat plastic film tube 4 corona discharge treatment machine 5 corona discharge treatment surface 5'non-corona discharge treatment surface 6,6 'printing cylinder 7,7 ′ Printing cylinder 8 Shaft of printing cylinder 9 Drive gear of shaft 10 Non-contact sensor sensing piece 11 Non-contact sensor 12 Missing part of non-contact sensor sensing piece 13 Printing 14 Gazette 15 Folding part 16 Gazette forming device 17 Thermal fusion device 18, 18 'End 19 Thermal fusion 20 Bottom 21 Cutter 22 Cut line 23 Gazette bag 24, 25 One end 26 Bottom both sides 27 Both sides

Claims (3)

[Claims] 1. A flat plastic film tube (2) obtained by flattening a plastic film tube (1) produced by an inflation method is used as a material, and gussets (14) are formed on both sides thereof, and one end (24) in the lengthwise direction is open. However, the other end (25) has a fold (1) for the gusset (14).
5) including the whole width by heat fusion (19) to the bottom (2)
(0), the both sides (26) of the portion which has been made into the bottom portion (20) by the heat fusion (19) and the folded portion (15) of the gusset (14) are not subjected to the corona discharge treatment and heat fusion. Corona discharge treatment is applied to both sides (27) between the bottom (20) and the open end (24) and the folded part (15) of the gusset (14). A gusset bag, which is further printed (13). 2. Corona discharge treatment is applied to both sides (3) and (3 ′) of a flat plastic film tube (2) obtained by flattening the plastic film tube (1) by the inflation method at regular intervals in the longitudinal direction. After that, the corona discharge treated surface (5) is subjected to printing (13), then gussets (14) are formed on both sides of the flat plastic film tube (2), and then the flat plastic film tube provided with the gusset 14 is applied. The non-corona discharge treated surface (5 ') of (2) is heat-sealed (19) between the end (18) and the end (18'), and the bottom (20) is obtained.
Both sides (27) of the bag obtained by forming a cutout and cutting the bag into fixed lengths, and the folded part (15) of the gusset (14)
And (13) is printed on the and, and the entire width is heat-sealed (19) including the folding part (15) of the gusset (14) which should become the bottom part (20) of the bag, and one end (24) is A method for making a gusset bag in an open state. 3. The method for producing a gusset bag according to claim 2, wherein the rotation of the printing cylinder is detected by a sensor to carry out the corona discharge and the stop thereof.