JP7413747B2 - Bag making system with laser processing machine - Google Patents

Description

The present invention relates to a bag making system equipped with a laser processing machine for manufacturing pouches having easy-open perforation lines formed by laser processing.

Conventionally, when a user takes out the contents of a pouch that is formed into a bag shape by heat-sealing the outer periphery of a resin film and stores the contents in a storage part inside the outer seal part. Some products have easy-to-open processing, such as laser processing to form a half-cut cutout line along the part that serves as the spout for the contents, so that they can be opened by hand without using scissors. , Patent Document 1, etc.).

In general, this type of pouch is made by sequentially unrolling a long raw film made of resin film, heat sealing for thermal adhesion, easy-opening processing to form a cut line, and the outer contour of the pouch. Each process, such as cutting along the line, is carried out in an assembly line, and bags are manufactured. At this time, the raw film is transported with a certain amount of tension applied to it, so the raw film undergoes slight elongation due to the transport tension, resulting in the processing position in each process exceeding the allowable range. Misalignment may occur. That is, for example, the formation position of the cutting line by laser processing is determined in advance at a predetermined position on the film screen printed on the original film, but if the original film stretches and the screen pitch changes greatly, There is a problem in that the position at which the perforation line is formed deviates from a predetermined position.

Japanese Patent Application Publication No. 2001-287284

In order to solve the above problems, conventionally, when the screen pitch of the original film changes, it is necessary to manually move the laser processing unit for laser processing in order to adjust the formation position of the cutting line. It is being done.
Pouches manufactured with the cut-off line deviated from the predetermined position on the film screen must be removed as a defective product if the cut-off line deviates from the permissible range, but until it is discovered by someone in charge of packaging, etc. Bags of defective products are made continuously. Furthermore, the cutout lines are often hidden by the shape of the pouch or the printed design on the film screen, making it difficult to visually sort them. Although it is possible to minimize the occurrence of defects, there are many cases where manufacturing continues without noticing that the position of the cutout line has shifted, and in such cases, a large number of defective products are produced. There is a manufacturing problem in that not only does this occur and the yield is lowered, but also the sorting work requires a lot of manpower and the production efficiency is significantly lowered.

The present invention solves these problems, improves the yield, suppresses the occurrence of defective products, and makes it possible to manufacture pouches with laser cut lines formed with extremely high production efficiency. The purpose of this invention is to provide a bag making system equipped with a laser processing machine.

The bag making system with a laser processing machine of the present invention uses laser processing to produce a pouch that is formed into a bag shape by thermally bonding a pair of films to form an outer peripheral seal, and has laser processing lines formed at predetermined positions. A bag making system with a machine,
a paper feed unit that feeds the pair of films in one direction;
a thermally bonded portion that forms the outer peripheral seal portion by thermally bonding;
a laser processing section that forms the laser processing line at a predetermined position on the film;
a position detection means for measuring the screen pitch of the film, which is disposed upstream of the laser processing section and downstream 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 detection means;
a control unit that displaces the formation position of the laser processing line in the laser processing unit along the film supply direction based on the correction value calculated in the calculation unit ,
The thermal bonding portion includes a longitudinal thermal bonding portion for forming the outer peripheral seal portion extending in the film supply direction and a horizontal thermal bonding portion for forming the outer peripheral seal portion extending in the width direction of the film. have,
The position detecting means includes a first surveillance camera installed downstream of the paper feeding section and upstream of the vertical thermal bonding section, and a first surveillance camera installed downstream of the vertical thermal bonding section and horizontally disposed downstream of the vertical thermal bonding section. and a second surveillance camera installed upstream of the directional thermal bonding part, and from the image information obtained from the first surveillance camera and the second surveillance camera, change of the path between screen pitches is determined. The above problem is solved by measuring the amount .

According to the bag making system with a laser processing machine of the present invention, the formation position of the laser processing line (laser processing position) is displaced in the film feeding direction based on the screen pitch of the original film measured by the position detection means. By doing so, the laser processing position automatically follows the predetermined position on the film screen with respect to the screen pitch of the original film fed out from the paper feed section, so the laser processing section for forming the laser processing line There is no need to manually move the pouch, which improves yield and prevents the production of defective products. As a result, pouches with laser processing lines formed can be manufactured with extremely high production efficiency.
According to the invention according to claim 2, the laser processing position is displaced by adjusting the angle of the mirror member of the laser processing section, so that the laser processing position can be adjusted only by adjusting the angle of the mirror member, which is a member that can be controlled with high precision. Since the processing position can be displaced, the laser processing position can be reliably aligned with the predetermined position on the film screen, thereby reliably preventing the occurrence of defective products and achieving higher production efficiency. A pouch with laser processing lines formed thereon can be manufactured.
According to the present invention , since the position detecting means is a surveillance camera that measures the screen pitch, it is possible to easily measure the screen pitch of the film, thereby reliably preventing the occurrence of defective products. A pouch with laser processing lines formed thereon can be manufactured with high production efficiency.
According to the present invention , by having laser processing units that form laser processing lines on each of the pair of films, it is possible to form laser processing lines on both sides of the pair of films without reversing the front and back sides. Pouches can be manufactured with high production efficiency.
According to the present invention , a plurality of laser processing units for a pair of films are arranged offset from each other in the film supply direction, thereby improving the efficiency of wiring connected to the laser processing units. It is possible to save space in the attached bag making system itself.
According to the invention according to the present invention, the position detecting means identifies the position at which thermal bonding starts in the thermal bonding section, the meandering state of the film fed in the sheet feeding section, or the position detecting means in the sheet feeding section. By identifying the mutual deviation in the film feeding direction of a pair of films fed in the bag making system, it is possible to use common parts, thereby saving space in the bag making system with laser processing machine itself. Can be done.

(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 in (a) in an enlarged manner. 1 is a schematic diagram showing a bag making system with a laser processing machine according to an embodiment of the present invention. It is a schematic diagram for explaining the main part of a laser processing unit.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bag making system with a laser processing machine according to an embodiment of the present invention will be described below based on the drawings.
A bag making system with a laser processing machine according to an embodiment of the present invention produces a pouch in which laser processing lines are formed at predetermined positions.

An embodiment of a pouch 10 on which laser processing lines are 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. 1(a), the pouch 10 is formed into a bag shape by forming a peripheral seal part 20 by thermally bonding a pair of resin films 11, and a storage part inside the peripheral seal part 20. 25 contains the contents. Specifically, a side seal part 21 of the outer seal part 20 is formed on the side periphery of the film 11, and a bottom seal part 22 of the outer periphery seal part 20 is formed on the bottom periphery of the film 11. It is formed. In the example shown in FIG. 1, the upper part of the pouch 10 is unsealed, but normally the top seal portion of the pouch 10 is transported to the filling process in an unsealed state, and the contents are not sealed. After filling, a top seal is formed.
When configured as a pouch 10 having a bottom such as a standing pouch, the side seal portion 21 is formed with a bottom film (bottom film) folded and inserted between a pair of films 11, and the film 11 and A bottom seal portion 22 is formed between the bottom film and the bottom film.

A nozzle 16 that projects obliquely upward is formed at a corner of the film 11 (upper left corner in FIG. 1). A cutting line 18 for providing easy-opening properties is formed in the nozzle 16 in a straight line so as to pass through the outer peripheral seal part 20 of the pouch 10 and the non-heat-sealed housing part 25, and the cutting line 18 is formed at the cutting start position. A notch 15 is formed in the.
The cutting line 18 is formed to cut off and open the tip portion 19 of the nozzle 16, and after cutting the tip portion 19 along the cutting line 18, the contents are poured into the nozzle 16. A spout is formed.
The perforation line 18 is formed on both the front and back films 11, 11 constituting the nozzle 16 so that their positions coincide with each other.
The cutting line 18 is a groove-shaped laser processing line formed by laser processing (laser irradiation) 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 thickness direction of the film 11. 18a. The laser processing line 18a is not limited to a continuous groove shape, but 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 may have various shapes such as a curved line, a V-shape, or a combination of these and a straight line.
As shown in FIG. 1(b), the perforation 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 perforation line 18 is constituted by four continuous linear grooves (laser processing lines 18a) arranged at approximately equal intervals. By configuring the perforation line 18 from a set of a plurality of laser processing lines 18a in this way, it is possible to improve the ease of opening the nozzle 16 and the stability of the opening direction when opening the nozzle 16.
Each laser processing line 18a constituting the perforation line 18 extends in a direction crossing the protruding direction of the nozzle 16, that is, as it goes toward the side seal portion 21 side (left side in FIG. 1), it extends toward the bottom seal portion 22 side (left side in FIG. 1). 1, it is formed as a diagonal line pointing downward).
In FIG. 1, reference numeral 13 is an arrow pattern for showing the user how to open the opening.

A bag making system equipped with a laser processing machine according to an embodiment of the present invention is for making the pouch 10 as described above, and as shown in FIG. a thermal bonding section 40 that forms the outer peripheral seal section 20 by thermal bonding; a laser processing section 50 that forms a laser processing line 18a at a predetermined position on the film 11; and a laser processing section 50 that controls the laser processing position. It is equipped with a laser processing line position control mechanism. The laser processing line position control mechanism measures the screen pitch of a pattern printed in advance on the film 11, which is arranged upstream of the laser processing section 50 and downstream of the paper feeding section 30 in the feeding direction of the film 11. the position detection means 60; a calculation section 70 that calculates a correction value for adjusting the laser processing position in the laser processing section 50 based on the screen pitch of the film 11 measured by the position detection means 60; It has a control section 80 that displaces the laser processing position in the laser processing section 50 along the supply direction of the film 11 based on the calculated correction value.

The paper feed unit 30 sequentially feeds out the films 11 from a raw film in which a long non-heat-sealed film 11 is wound up, and runs them in one direction as a laminate in which a pair of films 11 are laminated. supply.
The film 11 is formed with a printed part (not shown) on which designs such as letters and patterns are printed 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). The symbols are transported intermittently in accordance with the screen pitch (pitch) of the symbols.
The paper feed section 30 is provided with a lamination section 31 that obtains a laminated body in which the front side film 11 and the back side film 11 are laminated. When the pouch 10 is configured to have a bottom, a laminate is obtained in which the bottom film is folded and sandwiched between the film 11 on the front side and the film 11 on the back side in the laminated part 31, and this is supplied to the road.

In the present invention, the feeding direction of the film 11 is the direction in which the film 11 is fed out from the feeding roll and travels (the left direction (x direction) in FIG. 2), and the width direction of the film 11 is the feeding direction of the film 11. (the 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 includes at least a laser absorption layer in the outermost layer and a laser non-absorption layer in the innermost layer. The laser processing line 18a is formed, for example, so as to penetrate in the thickness direction through layers other than the innermost layer among the plurality of layers constituting the film 11. To give an example of the layer structure of the film 11, for example, a PET (polyethylene terephthalate) layer, an aluminum vapor-deposited layer, a nylon layer, and a polyethylene layer (innermost layer) having heat sealability are laminated in order from the outer surface side. It can be done.

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

The laser processing section 50 forms the 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. It has a laser processing unit with
As a laser light source, a YAG laser, a carbon dioxide laser, an argon ion laser, etc. can be used.
In this embodiment, the configuration includes laser processing units 51A and 51B that respectively form laser processing lines 18a on the pair of films 11. Specifically, a laser processing unit 51A that irradiates laser light onto the film 11 on the front side is arranged on one side (upper side in FIG. 2) of the travel path of the film 11 so as to face the film 11 on the front side. At the same time, a laser processing unit 51B that irradiates laser light to the film 11 on the back side is arranged on the other side of the traveling path of the film 11 (lower side in FIG. 2) so as to face the film 11 on the back side. . Each laser processing unit 51A, 51B forms a laser processing line 18a on the film 11 on the back side so as to be shifted from each other in the supply direction of the film 11.The laser processing unit 51B forms a laser processing line 18a on the film 11 on the front side. The laser processing unit 51A is located downstream of the laser processing unit 51A.

The optical system 52 includes 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 a mirror member 53 that collects the laser light emitted from the mirror member 53. The lens system 54 includes a plurality of condensing lenses 54A and 54B that emit light. The mirror member 53 is supported in an adjustable manner so that the angle of the mirror member 53 with respect to the optical axis of the laser beam can be adjusted based on a correction value calculated by a calculation unit 70, which will be described later. The condenser lenses 54A and 54B are arranged so that their optical axes are coaxial.

The position detection means 60 is arranged upstream of the laser processing section 50 in the feeding direction of the film 11, and specifically, located downstream of the lamination section 31 of the sheet feeding section 30 and located near the thermal bonding section 40. A first surveillance camera 61 installed upstream of the vertical thermal bonding section 41 of the thermal bonding section 40 and downstream of the vertical thermal bonding section 41 of the thermal bonding section 40 and upstream of the horizontal thermal bonding section 42 of the thermal bonding section 40 . It has a second surveillance camera 62 installed on the side.
In the position detection 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 The amount of variation in elongation of No. 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 something. Specifically, the correction value is to shift the laser processing position upstream in the supply direction (x direction) of the film 11 when the film path becomes long, and to shift the laser processing position to the upstream side of the film 11 when the film path becomes short. The value is finely adjusted so as to be displaced downstream in the supply direction (x direction) of No. 11.
The control unit 80 automatically adjusts the angle of the mirror members 53, 53 in the laser processing units 51A, 51B with respect to the optical axis of the laser beam based on the correction value (coordinates of the laser processing position) calculated in the calculation unit 70. This is to finely adjust the laser oscillation direction for following and forming the laser processing line 18a.
In the laser processing line position control mechanism, the laser processing position is controlled every screen pitch of the film 11, but is not limited to this, and 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 image information from the surveillance cameras 61 and 62 of the position detection means 60.

In the bag making system equipped with a laser processing machine as described above, the pouch 10 is manufactured as follows.
First, when the film 11 is unwound from the original film in the paper feed section 30, the pair of films 11 is folded and sandwiched between the pair of films 11 with a constant tension applied by a drive roller or a constant tensioner device (not shown). The laminate is transported to the longitudinal thermal bonding section 41 as a laminate. The laminate conveyed to the longitudinal thermal bonding section 41 is heat-sealed to the pair of films 11 in the feeding direction (vertical direction) of the films 11 in the longitudinal thermal bonding section 41, so that the bottom film is placed on the surface side. The bottom seal portion 22 is formed by heat-sealing the film 11 and the film 11 on the back side to be integrated. Next, the laminate transported to the lateral thermal bonding section 42 is heat-sealed to the pair of films 11 in the width direction (horizontal direction) of the films 11 in the lateral thermal bonding section 42 to form a side seal section. 21 is formed. At this time, the side seal part 21 at the rear end of the first pitch and the side seal part 21 at the leading 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 path between screen pitches (film path) is measured by monitoring cameras 61 and 62 before and after being transported to the longitudinal thermal bonding section 41, and a correction value (coordinates of the laser processing position) is calculated in the calculation section 70. The control unit 80 automatically adjusts the angle of the mirror member 53 in the laser processing units 51A, 51B based on this correction value (coordinates of the laser processing position), thereby adjusting the laser processing position to a predetermined position on the film screen. automatically displaced.
Then, in the laser processing section 50 whose laser processing position is automatically controlled to a predetermined position on the film screen by the control section 80, first, the upper laser processing unit is placed on the film 11 on the front side (the upper side in FIG. 2). Laser light is irradiated from 51A, and a plurality of laser processing lines 18a are formed on the film 11 on the front side by this laser light. Next, one pitch downstream in the supply direction of the film 11, the film 11 on the back side (lower side in FIG. 2) is irradiated with laser light from the lower laser processing unit 51B, and the laser beam cuts the film on the back side. A plurality of laser processing lines 18a are formed on 11.
The pouch 10 on which the laser processing line 18a has been formed is cut along the outer contour of the pouch 10 at a cutting section (not shown) and separated from the continuous original film. As a result, a pouch 10 is formed in which the portion that will become the top seal portion is in an unsealed state.

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 scope of the present invention as set forth in the claims. It is possible.
For example, the pouch is not limited to a pouch having a nozzle, but may be a pouch in which a perforation line is formed across the entire width direction (horizontal direction in FIG. 1).
In addition, the specific embodiment of the pouch 10 is not limited to a 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.

Moreover, the position detection means can commonly use an identification member such as a camera that has another function in this bag making system with a laser processing machine. The identification member having another function is, for example, one that identifies the position at which thermal bonding starts in the thermal bonding section 40, one that identifies the meandering state of the film 11 fed in the paper feed section 30, or a For example, there is a device that identifies a mutual shift in the feeding direction of the pair of films 11 fed in the section 30.

10 Pouch 11 Film 13 Pattern 15 Notch 16 Nozzle 18 Cutting line 18a Laser processing line 19 Tip portion 20 Peripheral seal portion 21 Side seal portion 22 Bottom seal portion 25 Storage portion 30 Paper feed portion 31 Laminated portion 40 Thermal adhesive portion 41 Longitudinal heat Adhesive section 42 Lateral thermal bonding section 50 Laser processing section 51A, 51B Laser processing unit 52 Optical system 53 Mirror member 54 Lens system 54A, 54B Condensing lens 60 Position detection means 61 First surveillance camera 62 Second surveillance camera 70 Arithmetic unit 80 Control unit

Claims (7)

A bag making system equipped with a laser processing machine that produces a pouch formed into a bag shape by thermally adhering a pair of films to form an outer peripheral seal portion and having a laser processing line formed at a predetermined position,
a paper feed unit that feeds the pair of films in one direction;
a thermally bonded portion that forms the outer peripheral seal portion by thermally bonding;
a laser processing section that forms the laser processing line at a predetermined position on the film;
a position detection means for measuring the screen pitch of the film, which is disposed upstream of the laser processing section and downstream 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 detection means;
a control unit that displaces the formation position of the laser processing line in the laser processing unit along the film supply direction based on the correction value calculated in the calculation unit ,
The thermal bonding portion includes a longitudinal thermal bonding portion for forming the outer peripheral seal portion extending in the film supply direction and a horizontal thermal bonding portion for forming the outer peripheral seal portion extending in the width direction of the film. have,
The position detecting means includes a first surveillance camera installed downstream of the paper feeding section and upstream of the vertical thermal bonding section, and a first surveillance camera installed downstream of the vertical thermal bonding section and horizontally disposed downstream of the vertical thermal bonding section. and a second surveillance camera installed upstream of the directional thermal bonding part, and from the image information obtained from the first surveillance camera and the second surveillance camera, change of the path between screen pitches is determined. A bag making system equipped with a laser processing machine characterized by measuring quantity . The laser processing unit includes a laser processing unit that includes 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 light emitted from the laser light source,
2. A forming position of a laser processing line in the laser processing section is displaced by adjusting an angle of the mirror member based on the correction value calculated by the calculation section. Bag making system with laser processing machine. 3. The bag making system with a laser processing machine according to claim 1, wherein the laser processing section has a laser processing unit that forms a laser processing line on each of the pair of films. 4. The bag making system with a laser processing machine according to claim 3, wherein the laser processing units of the laser processing section are arranged offset from each other in the film supply direction. 5. The bag making system with a laser processing machine according to claim 4, wherein the position detecting means identifies a position at which thermal bonding is started in the thermal bonding section. 6. The bag making system with a laser processing machine according to claim 1, wherein the position detecting means identifies a meandering state of the film fed in the paper feeding section. According to any one of claims 1 to 6, the position detecting means identifies a mutual shift in the film feeding direction of the pair of films fed in the paper feeding section. Bag making system with laser processing machine.

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