JP2021091167A - Bag-making system equipped with laser processing machine - Google Patents

Abstract

To provide a bag-making system equipped with a laser processing machine, the system capable of producing, considerably highly efficiently, a pouch including a cut-off line formed by a laser processing beam by improving a production yield and curbing occurrence of a defective product.SOLUTION: A bag-making system equipped with a laser processing machine of this invention, for producing a pouch including a laser processed line formed in a predetermined position, comprises: a paper feeding section that feeds a film in one direction; a laser processing section that forms the laser processed line in the predetermined position of the film; position detection means that is disposed on the upstream side of the laser processing section and on the downstream side of the paper feeding section and measures a screen pitch of the film; a calculation section that calculates a correction value for adjusting a forming position of the laser processed line based on the screen pitch of the film; and a control section that displaces along the film feeding direction the forming position of the laser processed line in the laser processing section based on the correction value.SELECTED DRAWING: Figure 2

Description

The present invention relates to a bag making system with a laser processing machine for manufacturing a pouch in which a cut line for easy opening is formed by laser processing.

Conventionally, when a user takes out the contents in a pouch that is formed in a bag shape by heat-bonding (heat sealing) the outer periphery of the resin film and stores the contents in the accommodating portion inside the outer peripheral sealing portion. Some of the bags have been easily opened by laser machining along the part that will be the spout of the contents so that the bag can be opened by hand without using a scissors (for example). , Patent Document 1 etc.).

In general, this type of pouch is heat-sealed for heat bonding, easy-opening for forming a cut line, and the outer contour of the pouch while sequentially feeding out a long raw film made of a resin film. It is manufactured by making a bag by performing each process such as cutting along the line in an assembly line. At this time, since the raw film is conveyed while a certain amount of tension is applied, the raw film is stretched by a minute amount due to the conveying tension, and as a result, the processing position in each process deviates from the permissible range. Misalignment may occur. That is, for example, the position where the cut line is formed by laser processing is set to a predetermined position on the film screen printed on the raw film in advance, but when the raw film is stretched and the screen pitch fluctuates greatly, There is a problem that the formation position of the cut line deviates from a predetermined position.

Japanese Unexamined Patent Publication No. 2001-287284

In order to solve the above problems, conventionally, when the screen pitch of the raw film fluctuates, it is possible to manually move the laser processing unit for laser processing in order to align the formation position of the cut line. It is done.
A pouch manufactured with the cut line forming position deviating from a predetermined position on the film screen must be removed as a defective product if the cutting line misalignment deviates from the permissible range, but until the person in charge of boxing or the like discovers it. Bag making of defective products is carried out continuously. Furthermore, since the cut lines are often hidden by the shape of the pouch and the printed pattern on the film screen, it is difficult to visually sort them, and if misalignment is detected at the initial stage, it is a defective product. However, in many cases, the production is continued without noticing that the position of the cut line is displaced. In such a case, a large amount of defective products are produced. Not only is it generated and the yield is reduced, but also the sorting work requires a lot of manpower, and there is also a manufacturing problem that the production efficiency is significantly reduced.

The present invention solves these problems, and can manufacture a pouch in which a cut line formed by a laser machined line is formed with extremely high production efficiency by improving the yield and suppressing the occurrence of defective products. It is an object of the present invention to provide a bag making system with a laser processing machine.

The bag-making system with a laser processing machine of the present invention is laser-processed to produce a pouch formed in a bag shape by heat-bonding a pair of films to form an outer peripheral seal portion and having a laser-processed line formed at a predetermined position. It is a bag making system with a machine,
A paper feed unit that supplies a pair of films in one direction,
A heat-bonded part that forms the outer peripheral seal part by heat-bonding,
A laser processing section that forms the laser processing line at a predetermined position on the film,
A position detecting means for measuring the screen pitch of the film, which is arranged on the upstream side of the laser processing section and on the downstream side of the paper feeding section in the film supply direction.
A calculation unit that calculates a correction value for adjusting the formation position of the laser processing line in the laser processing unit based on the screen pitch of the film measured by the position detecting means.
The problem is solved by providing a control unit that displaces the formation position of the laser processing line in the laser processing unit along the supply direction of the film based on the correction value calculated by the calculation unit. ..

According to the bag making system with a laser machining machine of the present invention, the formation position (laser machining position) of the laser machining line is displaced in the film supply direction based on the screen pitch of the raw film measured by the position detecting means. By doing so, the laser machining position is automatically followed to a predetermined position on the film screen with respect to the screen pitch of the raw film unwound from the paper feed section, so that the laser machining section for forming the laser machining line. As a result of improving the yield and suppressing the occurrence of defective products without having to move the pouch by hand, it is possible to manufacture a pouch on which a laser machined line is formed with extremely high production efficiency.
According to the invention of claim 2, the laser machining position is displaced by adjusting the angle of the mirror member of the laser machining section, so that the laser can be controlled only by adjusting the angle of the mirror member, which can be controlled with high accuracy. Since the machining position can be displaced, the laser machining position can be reliably aligned with a predetermined position on the film screen, and therefore the occurrence of defective products can be reliably suppressed, resulting in higher production efficiency. A pouch on which a laser-machined line is formed can be manufactured.
According to the third aspect of the present invention, since the position detecting means is a surveillance camera that measures the screen pitch, the screen pitch of the film can be easily measured, so that the occurrence of defective products is surely suppressed. It is possible to manufacture a pouch in which a laser-machined line is formed with higher production efficiency.
According to the fourth aspect of the present invention, by each having a laser processing unit that forms a laser processing line for each pair of films, the laser processing lines are formed on both sides without inverting the front and back of the pair of films. Therefore, the pouch can be manufactured with high production efficiency.
According to the invention of claim 5, the efficiency of the wiring connected to the laser processing unit can be improved by arranging the plurality of laser processing units for the pair of films so as to be offset from each other in the film supply direction. It is possible to save space in the bag making system itself with a laser processing machine.
According to the sixth, seventh and eighth aspects of the present invention, the position detecting means identifies the position where the thermal bonding is started in the thermal bonding section, and the meandering state of the film supplied in the paper feeding section. A product with a laser processing machine can be used because the members can be standardized by identifying the one that identifies the film or the pair of films that are supplied in the paper feed section and that identifies the deviation of the film supply direction from each other. The space of the bag system itself can be saved.

(A) is a plan view showing a pouch manufactured by the bag making system with a laser processing machine of the present invention, and (b) is a plan view showing a part of the pouch of (a) in an enlarged manner. It is a schematic diagram which shows the bag making system with a laser processing machine which concerns on one Embodiment of this invention. It is a schematic diagram for demonstrating the main part of a laser processing unit.

Hereinafter, a bag making system with a laser processing machine according to an embodiment of the present invention will be described with reference to the drawings.
The bag-making system with a laser processing machine according to an embodiment of the present invention produces a pouch in which a laser processing line is formed at a predetermined position.

An embodiment of a pouch 10 on which a laser processing line is formed, which is manufactured by the bag making system with a laser processing machine of the present invention, will be described below.
As shown in FIG. 1A, the pouch 10 is formed in a bag shape by forming an outer peripheral seal portion 20 in which a pair of resin films 11 are heat-bonded, and is an accommodating portion inside the outer peripheral seal portion 20. The contents are stored in 25. Specifically, the side seal portion 21 of the outer peripheral seal portion 20 is formed on the side peripheral edge of the film 11, and the bottom seal portion 22 of the outer peripheral seal portion 20 is formed on the bottom peripheral edge of the film 11. It is formed. In the example shown in FIG. 1, the upper part of the pouch 10 is in an unsealed state, but normally, the portion of the pouch 10 that becomes the top-sealed portion is conveyed to the filling step of the contents in the unsealed state, and the contents are not sealed. The top seal portion is formed after the filling.
When configured as a pouch 10 having a bottom such as a standing pouch, the side seal portion 21 is formed in a state where the bottom film (bottom film) is folded and inserted between the pair of films 11 to form the side seal portion 21 and the film 11. A bottom seal portion 22 is formed between the bottom seal portion 22 and the bottom film.

A nozzle 16 projecting diagonally upward is formed at a corner of the film 11 (upper left corner in FIG. 1). A cut line 18 for imparting easy-opening property is formed in a straight line on the nozzle 16 so as to pass through the outer peripheral seal portion 20 and the heat-sealed accommodating portion 25 of the pouch 10, and the cut start position thereof. A notch 15 is formed in the.
The cut line 18 is formed to cut and open the tip portion 19 of the nozzle 16, and the contents are poured out to the nozzle 16 after the tip portion 19 is cut along the cut line 18. A spout is formed.
The cut line 18 is formed on both the front and back films 11 and 11 constituting the nozzle 16 so that their positions coincide with each other.
The cut line 18 is a groove-shaped laser processing line formed by laser processing (laser irradiation), which is formed from the outer surface of the film 11 (that is, the surface exposed to the outside of the pouch 10) to the middle of the film 11 in the thickness direction. It is composed of 18a. The laser processing line 18a is not limited to a continuous groove shape, and may be a groove shape extending in a broken line shape. Further, the laser processing line 18a is not limited to a straight line, and various shapes such as a curved line, a V shape, or a combination of these and a straight line can be adopted.
As shown in FIG. 1B, the cut line 18 is composed of a set of a plurality of laser processing lines 18a extending parallel to the pouch plane direction. In the example shown in FIG. 1, the cut line 18 is formed by four continuous linear grooves (laser machined lines 18a) arranged at substantially equal intervals. By forming the cutting line 18 from the aggregate of the plurality of laser processing lines 18a in this way, it is possible to improve the opening property of the nozzle 16 and the stability in the opening direction at the time of opening.
Each laser processing line 18a constituting the cutting line 18 extends in a direction intersecting the protruding direction of the nozzle 16, that is, toward the side seal portion 21 side (left side in FIG. 1) toward the bottom seal portion 22 side (FIG. 1). It is formed as a diagonal line toward (downward in 1).
In FIG. 1, reference numeral 13 is a symbol of an arrow for indicating the opening method to the user.

The bag-making system with a laser machine according to an embodiment of the present invention manufactures a pouch 10 as described above, and as shown in FIG. 2, the pair of films 11 and 11 are directed in one direction. Controls the laser machining position, the heat feeding section 30 that forms the outer peripheral seal section 20 by thermal bonding, the laser machining section 50 that forms the laser machining line 18a at a predetermined position on the film 11. It is equipped with a laser machining line position control mechanism. The laser processing line position control mechanism measures the screen pitch of the pattern pre-printed on the film 11 arranged on the upstream side of the laser processing unit 50 and on the downstream side of the paper feeding unit 30 in the supply direction of the film 11. The position detection means 60, the calculation unit 70 that calculates the correction value for adjusting the laser processing position in the laser processing unit 50 based on the screen pitch of the film 11 measured by the position detection means 60, and the calculation unit 70. It has a control unit 80 that shifts the laser processing position in the laser processing unit 50 along the supply direction of the film 11 based on the calculated correction value.

The paper feed unit 30 sequentially feeds out the film 11 from the raw film on which the long unheat-sealed film 11 is wound, and runs the film 11 in one direction as a laminated body in which a pair of films 11 are laminated. It is what we supply.
A printing portion (not shown) on which a pattern such as a character or a pattern is printed is formed on the film 11 in advance, and the film 11 is in a state where a constant tension is applied by a drive roller or a constant tensioner device (not shown). Then, it is intermittently conveyed according to the screen pitch (pitch) of the design.
The paper feed unit 30 is provided with a laminated unit 31 for obtaining a laminated body in which the film 11 on the front surface side and the film 11 on the back surface side are overlapped with each other. When the pouch 10 is configured to have a bottom, a laminate obtained by folding and sandwiching the bottom film between the film 11 on the front surface side and the film 11 on the back surface side in the laminated portion 31, is obtained, and this is the film 11. It is supplied to the running path of.

In the present invention, the supply direction of the film 11 is the direction in which the film 11 is unwound from the feeding roll and travels (the left direction (x direction) in FIG. 2), and the width direction of the film 11 is the supply direction of the film 11. Is defined as the direction perpendicular to the paper surface (direction perpendicular to the paper surface in FIG. 2).

One film 11 is composed of, for example, a plurality of layers laminated in the thickness direction, and has at least an outermost layer having a laser absorbing layer and an innermost layer having a laser non-absorbing layer. The laser processing line 18a is formed so as to penetrate, for example, a layer other than the innermost layer in the plurality of layers constituting the film 11 in the thickness direction. To give an example of the layer structure of the film 11, for example, a PET (polyethylene terephthalate) layer, an aluminum vapor deposition layer, a nylon layer, and a polyethylene layer having a heat-sealing property (innermost layer) are laminated in this order from the outer surface side. Can be.

The heat-bonding portion 40 includes a vertical heat-bonding portion 41 for forming an outer peripheral sealing portion 20 extending in the supply direction (longitudinal direction) of the film 11 and an outer peripheral sealing portion 20 extending in the width direction (horizontal direction) of the film 11. It has a lateral heat-bonding portion 42 for forming.
In the present embodiment, in order to improve the manufacturing efficiency, two pouches 10 are manufactured at the same time along the supply direction of the film 11. Specifically, the top seal portions of the two pouches 10 face each other and the bottom seal portions 22 are separated from each other, and one side seal portion 21 (left side seal portion in FIG. 1) is in the supply direction (FIG. 1). It is manufactured in the state of being at the beginning of (x direction). In FIG. 1, therefore, in the present embodiment, the vertical heat-bonded portion 41 forms the bottom seal portion 22, and the lateral heat-bonded portion 42 forms the side seal portion 21. The pouches 10 may be configured to be manufactured one by one along the supply direction of the film 11.

The laser processing unit 50 forms a laser processing line 18a by laser processing, and includes a laser light source (not shown) that emits laser light and an optical system 52 that irradiates the surface of the film 11 with the laser light. Has a laser processing unit.
As the laser light source, a YAG laser, a carbon dioxide gas laser, an argon ion laser and the like can be used.
In the present embodiment, the laser processing units 51A and 51B that form the laser processing lines 18a on the pair of films 11 are provided, respectively. Specifically, the laser processing unit 51A that irradiates the film 11 on the surface side with a laser beam is arranged on one side (upper side in FIG. 2) of the traveling path of the film 11 so as to face the film 11 on the surface side. At the same time, the laser processing unit 51B that irradiates the film 11 on the back surface side with the laser beam is arranged on the other side (lower side in FIG. 2) of the traveling path of the film 11 so as to face the film 11 on the back surface side. .. The laser processing units 51A and 51B form a laser processing line 18a on the film 11 on the back surface side so that the laser processing units 51A and 51B are displaced from each other in the supply direction of the film 11. The laser processing unit 51B forms the laser processing line 18a on the film 11 on the front surface side. It is arranged on the downstream side of the laser processing unit 51A.

The optical system 52 collects a mirror member 53 having a laser light reflecting surface that changes the traveling direction of the laser light L emitted from the laser light source toward the traveling path of the film 11, and the laser light emitted from the mirror member 53. It has a lens system 54 having a plurality of light condensing lenses 54A and 54B. The mirror member 53 is supported in an adjustable manner so that the angle of the laser beam of the mirror member 53 with respect to the optical axis can be adjusted based on the correction value calculated by the calculation unit 70 described later. The condenser lenses 54A and 54B are arranged so that their optical axes are coaxially located.

The position detecting means 60 is arranged on the upstream side of the laser processing section 50 in the supply direction of the film 11, and specifically, on the downstream side of the laminated section 31 of the feeding section 30, the heat bonding section 40. The first monitoring camera 61 installed on the upstream side of the vertical heat-bonded portion 41 of the above, and the downstream side of the heat-bonded portion 40 from the vertical heat-bonded portion 41 and upstream of the lateral heat-bonded portion 42. It has a second surveillance camera 62 installed on the side.
In the position detecting means 60, the screen pitch of the film 11 is measured. Specifically, from the image information obtained from the first surveillance camera 61 and the image information obtained from the second surveillance camera 62, a path between screen pitches (film path), that is, a film, is used by an appropriate image processing device. The fluctuation amount of the elongation of 11 is measured.
The calculation unit 70 calculates a correction value (coordinates of the laser processing position) for finely adjusting the laser processing position along the supply direction of the film 11 so as to correspond to the expansion and contraction of the film 11 in the supply direction of the film 11. It is a thing. Specifically, the correction value displaces the laser processing position to the upstream side in the supply direction (x direction) of the film 11 when the film path becomes long, and sets the laser processing position to the film when the film path becomes short. The value is finely adjusted so as to be displaced downstream in the supply direction (x direction) of 11.
The control unit 80 automatically adjusts the angle of the laser light of the mirror members 53 and 53 in the laser processing units 51A and 51B with respect to the optical axis based on the correction value (coordinates of the laser processing position) calculated by the calculation unit 70. The laser oscillation direction is finely adjusted so as to follow and form the laser processing line 18a.
In the laser machining line position control mechanism, the laser machining position is controlled for each pitch of the screen pitch of the film 11, but the present invention is not limited to this, and the laser machining line position control mechanism may be every several pitches to several tens of pitches.
As described above, in the laser processing line position control mechanism, the laser processing position is automatically displaced to a predetermined position on the film screen based on the image information from the monitoring cameras 61 and 62 of the position detecting means 60.

In the bag making system with a laser processing machine as described above, the pouch 10 is manufactured as follows.
First, when the film 11 is fed out from the original film in the paper feed unit 30, the bottom film is folded and sandwiched between the pair of films 11 in a state where a constant tension is applied by a drive roller or a constant tensioner device (not shown). It is conveyed to the vertical heat bonding portion 41 as a laminated body. In the laminate conveyed to the vertical heat-bonding portion 41, the pair of films 11 are heat-sealed in the supply direction (longitudinal direction) of the films 11 in the vertical heat-bonding portion 41, and the bottom film is on the surface side. The film 11 and the film 11 on the back surface side are heat-sealed and integrated to form the bottom seal portion 22. Next, the laminate conveyed to the lateral heat-bonding portion 42 is heat-sealed with respect to the pair of films 11 in the lateral heat-bonding portion 42 in the width direction (horizontal direction) of the films 11, and the side-sealing portion. 21 is formed. At this time, the side seal portion 21 at the rear end of the first pitch and the side seal portion 21 at the front end of the second pitch are heat-sealed at the same time along the supply direction of the film 11.
On the other hand, the paths between screen pitches (film paths) are measured by the monitoring cameras 61 and 62 before and after the transfer to the vertical thermal bonding unit 41, and the correction value (coordinates of the laser machining position) is calculated by the calculation unit 70. The control unit 80 automatically adjusts the angle of the mirror member 53 in the laser machining units 51A and 51B based on this correction value (coordinates of the laser machining position), whereby the laser machining position is set to a predetermined position on the film screen. Is automatically displaced to.
Then, in the laser processing unit 50 in which the laser processing position is automatically controlled to a predetermined position on the film screen by the control unit 80, first, the laser processing unit above the film 11 on the front surface side (upper side in FIG. 2) A laser beam is irradiated from 51A, and a plurality of laser processing lines 18a are formed on the film 11 on the surface side by the laser beam. Next, a laser beam is irradiated from the lower laser processing unit 51B to the film 11 on the back surface side (lower side in FIG. 2) on the downstream side by one pitch in the supply direction of the film 11, and the film on the back surface side is irradiated with the laser beam. A plurality of laser processing lines 18a are formed on the eleven.
The pouch 10 on which the laser-machined line 18a is formed is cut along the outer contour of the pouch 10 at a cut-processed portion (not shown) and separated from the continuous raw film. As a result, the pouch 10 in which the portion to be the top seal portion is unsealed is formed.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible.
For example, the pouch is not limited to a pouch having a nozzle, and may be a pouch in which a cut line is formed over the entire width direction (horizontal direction in FIG. 1).
The specific embodiment of the pouch 10 is not limited to the standing pouch type, but may include various forms such as a pillow type pouch, a gusset type pouch, a flat pouch including a sachet, a square bottom pouch, and a zippered pouch. Can be adopted.

Further, as the position detecting means, an identification member such as a camera having another function in the bag making system with a laser processing machine can be commonly used. The identification member having another function is, for example, a member that identifies a position where thermal bonding is started in the thermal bonding section 40, a member that identifies a meandering state of the film 11 supplied by the feeding section 30, or a paper feeding section. Examples thereof include those that identify the deviation of the pair of films 11 supplied in the unit 30 in the supply direction of the films 11.

10 Pouch 11 Film 13 Design 15 Notch 16 Nozzle 18 Cut line 18a Laser machined line 19 Tip part 20 Outer peripheral seal part 21 Side seal part 22 Bottom seal part 25 Storage part 30 Feeding part 31 Laminated part 40 Thermal adhesive part 41 Vertical heat Adhesive part 42 Lateral thermal adhesive part 50 Laser processing part 51A, 51B Laser processing unit 52 Optical system 53 Mirror member 54 Lens system 54A, 54B Condensing lens 60 Position detecting means 61 First surveillance camera 62 Second surveillance camera 70 Calculation unit 80 Control unit

Claims (8)

A bag-making system with a laser processing machine that produces a pouch that is formed into a bag shape by heat-bonding a pair of films to form an outer peripheral seal portion and has a laser processing line formed at a predetermined position.
A paper feed unit that supplies a pair of films in one direction,
A heat-bonded part that forms the outer peripheral seal part by heat-bonding,
A laser processing section that forms the laser processing line at a predetermined position on the film,
A position detecting means for measuring the screen pitch of the film, which is arranged on the upstream side of the laser processing section and on the downstream side of the paper feeding section in the film supply direction.
A calculation unit that calculates a correction value for adjusting the formation position of the laser processing line in the laser processing unit based on the screen pitch of the film measured by the position detecting means.
A bag making machine with a laser processing machine, which comprises a control unit that displaces the formation position of a laser processing line in the laser processing unit along a film supply direction based on a correction value calculated by the calculation unit. system. The laser processing unit includes a laser processing unit having a laser light source that emits laser light and an optical system that irradiates the surface of the film with the laser light.
The optical system includes a mirror member that changes the traveling direction of the laser beam emitted from the laser light source.
The first aspect of claim 1, wherein the angle of the mirror member is adjusted based on the correction value calculated by the calculation unit, so that the formation position of the laser processing line in the laser processing unit is displaced. Bag making system with laser processing machine. The bag making system with a laser processing machine according to claim 1 or 2, wherein the position detecting means includes a surveillance camera for measuring a screen pitch. The bag making system with a laser machining machine according to any one of claims 1 to 3, wherein each of the laser machining units has a laser machining unit that forms a laser machining line on a pair of films. .. The bag making system with a laser processing machine according to claim 4, wherein each laser processing unit of the laser processing unit is arranged so as to be displaced from each other in the film supply direction. The bag making system with a laser machine according to any one of claims 1 to 5, wherein the position detecting means identifies a position at which thermal adhesion is started in the thermal bonding portion. The bag making system with a laser machine according to any one of claims 1 to 6, wherein the position detecting means identifies a meandering state of the film supplied in the paper feeding unit. The position detection means according to any one of claims 1 to 7, wherein the position detecting means identifies the deviation of the pair of films supplied in the paper feeding unit from each other in the film supply direction. The described bag making system with a laser machine.

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