JP2000185359A - Manufacture of standing pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exclude a defectively welded product out of a system by supplying straws to recesses bulged to outsides for the straws molded at two adjacent right and left corners when individual bags are formed, welding peripheries of the recesses, and feeding to a guiding step without cutting when a fault of an eddy current type displacement sensor is detected. SOLUTION: A raw fabric film is cut in half, divided into high and low positions, and recesses bulged to outsides to contain straws are molded at adjacent right and left corners of bags at right and left two units when the bags are formed at the lower side half-cut film 1. After the straws 3 are mounted in the recesses, the upper side half-cut film 1 is superposed on the lower side half-cut film 1, peripheries of the recesses are heated by a hot plate, then cooled by a cooling plate, a film 1 for a V-shaped bottom is inserted between the films from both sides of the upper and lower half-cut films 1, welded together with both the sides, and cut at a centerline to right and left bag rows. When a fault value is detected by an eddy current displacement sensor of the cooling plate when cooled, the film is fed to a guiding step without cutting. Thus, a faulted welded product at the periphery of the container of the straw 3 can be extruded out of a system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a standing pouch having a straw serving as a spout at one corner of a bag.

[0002]

2. Description of the Related Art As a pouch containing a liquid such as a detergent liquid for refilling, a liquid seasoning, and a beverage, a standing pouch having a straw serving as a spout at one corner of a bag has begun to spread.

[0003] For example, Japanese Patent Application Laid-Open No. H5-132069 discloses that two side walls (two films on the front and back) which are joined to each other by a longitudinal weld at an edge, one bottom, a corner portion or an edge portion. Wherein the pouring means is provided in a welded portion (seal portion) which closes the corner portion or the edge portion. However, there is shown a bag having a structure including a channel formed of a groove-shaped depression formed in advance on a side wall and a small tube inserted into the channel.

[0004] This type of pouch is easy to use because it can stand up while being a bag, and can smoothly pour out the liquid content. Therefore, when this standing pouch is used for refilling, the amount of bottles and bottles used can be reduced by that much, which follows the trend of resource saving, and the weight and space at the time of disposal of the used pouch when discarded. It is advantageous because it is small.

[0005]

When a small tube (straw) is sealed in the corner or edge region of the above-mentioned standing pouch, a flow path consisting of a groove-like depression is formed by, for example, a deep drawing method. A method is adopted in which a straw is put in the dent (flow path), and then the periphery of the dent is welded (heat-sealed).

In this case, if the straw is not molded to a rating or the posture of the straw in the concave portion is deviated from a fixed position, the straw is bitten (depressed).
Sealing is performed in this state, resulting in incomplete sealing. If an imperfect seal occurs, the contents may be leaked when the pouch is filled with the contents and subjected to a distribution process or a storage process, and microorganisms entering from the imperfect seal may be leaked. May contaminate the contents.

[0007] In the event of a straw biting during sealing, the management of the straw at the molding stage is strengthened to prevent the unrated straw from being mixed in (the straw is often obtained from a molding company or another factory). In addition, it can be reduced by adjusting the precision and environmental conditions of various devices at the bag making site. However, the allowable defect rate is severe, for example, 1/100 or less. Therefore, if even one defective product is found at the stage of inspection of a manufactured pouch, the defect rate is also determined before and after that. The entire lot may have to be discarded due to the possibility of defective products.

Therefore, not only the inspection stage after bag making but also
It is necessary to provide a check mechanism for managing the presence / absence of an abnormality even in the middle of the process, and for reliably removing a defective product out of the system if an abnormality is found.

In the background of the present invention, when manufacturing a standing pouch having a straw serving as a spout at one corner of a bag, a seal failure of a heat seal portion around a straw accommodating portion is automatically detected. It is another object of the present invention to provide a method of manufacturing a standing pouch in which defective products are reliably excluded from the system.

[0010]

According to the method for manufacturing a pouch of the present invention, in manufacturing a standing pouch in which a straw (3) serving as a spout is provided inside one corner of a bag, the film can be moved forward and backward. When the width direction of the film is set to the left and right, when it is made into individual bags in the subsequent process, it swells outward to accommodate the straw (3) at the adjacent corners of the two bags adjacent to the left and right The dent (2) is formed in units of two right and left, and the straw (3) is supplied and placed in the dent (2), and then the hot plates (4) and (4) are brought into contact with each other and then cooled. Board
(6), abutment of (6) to form a corner seal portion (5) by sealing around the two left and right recesses (2), and in the cooling step, the upper and lower cooling plates (6) The gap between (6) and (6) is detected by the eddy current displacement sensor (10) provided on the cooling plate (6), and when there is an abnormality in the detected value, a command not to cut in the film width direction is issued. And a configuration in which a plurality of individual bags for the front and rear are flowed to the deriving step in a state of being connected to each other.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

As the raw film for forming a bag, a laminated film composed of a base film / sealant layer is typically used, and may further include a layer having gas barrier properties. Examples of the base film include a biaxially oriented polypropylene film, a biaxially oriented nylon film, a biaxially oriented polyester film, a non-oriented polypropylene film, and a non-oriented nylon film. Examples of the sealant layer include various resin layers having heat sealing properties, including polyolefins (polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, ionomer, ethylene-propylene copolymer, etc.). Among these, among these polyethylenes, low-density polyethylenes, particularly linear low-density polyethylenes produced using various catalysts, are preferred. Examples of the layer having a gas barrier property include a layer of an ethylene-vinyl alcohol copolymer having an ethylene content of 20 to 60 mol% and a layer of an acrylonitrile polymer having a high acrylonitrile content. The lamination of each layer is performed by a method such as dry lamination, wet lamination, co-extrusion, or extrusion coating. On the inner surface side and / or the outer surface side (particularly the inner surface side) of the base film, pattern printing and / or solid printing can be performed in advance.

The straw (3) is often cylindrical, but is not limited to a cylindrical shape, as long as the straw (3) can be variously deformed. The straw (3) is often made of high-density polyethylene, low-density polyethylene, polypropylene, or the like. The straw (3) is produced by injection molding or extrusion molding, but is preferably an injection molded product in order to ensure dimensional accuracy.

The present invention is to produce a standing pouch in which a straw (3) serving as a spout is provided inside one corner of a bag. More specifically, this standing pouch is manufactured through the following steps. In addition, in order to make it easy to understand the positional relationship when individual bags are manufactured from the film, hereinafter, the traveling direction of the film will be referred to as front and rear, and the width direction of the film will be referred to as left and right as necessary.

<Step A / Film supply step>
The raw film unwound from the raw material supply roll is cut in half,
This is a step of sending each half-cut film (1), (1) to the downstream in a state where it is separated into high and low positions. In this case, the raw film is cut in half and then cut in half. The raw film is supplied at a constant speed to keep the tension constant in the step A, but is buffered in the step A, and in the subsequent steps B and thereafter, the film typically has a bag width in individual bags. 1 minute
The vehicle runs intermittently as a pitch.

<Step B / Molding Step> In step B, a predetermined portion of the lower half-cut film (1) or both half-cut films are formed.
The corresponding part of (1), which becomes an adjacent corner of two bags adjacent to each other when they are made into individual bags in the subsequent process, swelled outward to accommodate the straw (3) Dent
(2) is molded in two left and right units (two left and right parts can be considered as one unit and two or more units can be used, but the description is complicated, so the case of two left and right parts will be described). It is a process. It is particularly preferable that the recesses (2) are provided half-body at the corresponding portions of both half-cut films (1).

The formation of the dents (2) can be achieved, for example, by holding the film in a heated state with a mold, and pressing the film against the mold using compressed air and vacuum.

<Step C / Straw (3) Placing Step> Step C
The straw in the recess (2) of the lower half-finished film (1).
This is the step of supplying and placing (3). The supply of the straw (3) is performed by, for example, placing the straw (3) in a recess (2) using a vacuum grip device while feeding the straw (3) from a pipeline.

<Step D / Step of Forming Corner Seal (5)> In step D, the lower half film (1) with the straw (3) placed in the recess (2) is placed on the upper half film (1). And heat plate from above and below to form corner seals (5).
(4) A step of heating the periphery of the dent (2) in units of two right and left by abutting (4). The heating operation in the step D is preferably performed in two stages of preheating and main heating in order to complete the heat fusion. The heating of the hot plates (4), (4) is performed by electric heating or heat pipe heating from the back.

<Step E / Cooling Step> In the step E, in order to complete the corner seal portion (5), the cooling plates (6) and (6) are brought into contact with the portions heated in the previous step D from above and below to form the left and right sides. 2 dents
(2) This is a step of cooling the surroundings. The cooling plates (6), (6) generally have substantially the same shape as the hot plates (4), (4). The cooling operation in step E is preferably performed in two stages of main cooling and secondary cooling in order to ensure complete cooling. The cooling of the cooling plates (6), (6) is performed by, for example, water cooling from the back.

<Step F / Step of Forming Bottom Seal Portion (8)> Step F is a step of forming a bottom-shaped film (V) folded between both sides of the running upper and lower half films (1) and (1). 7),
This is a step of inserting (7) and performing heat sealing to form a bottom seal portion (8) when individual bags are formed.

The bottom films (7), (7) are previously run along both side surfaces of the half-cut films (1), (1) (folded into a V-shape using a triangular plate). In F, for example, a disc and a spatula jig are used to insert between the films. Then, heat melting is performed by a sealer, and then cooling is performed. When forming the bottom seal portion (8), insert the V-shaped bottom films (7), (7) between the films in order to seal both sides on the bottom side when individual bags are formed. Before punching, punch holes (P) are provided.

<Step G / Step of Forming Side Seal Part (9)>
Step G is a step in which heat sealing is performed in the width direction of the film to form a side seal portion (9) when individual bags are formed. In order to ensure the completeness of the seal, it is preferable to perform the heat melting by the sealer in, for example, two or three stages, and to perform the cooling in, for example, two stages.

<Process H / Separation process into left and right bag rows>
Step H is a step of cutting along the center line of the film and separating the film into left and right bag rows. This step H is performed, for example, by applying a cutter blade from above the running film. In this step H, the left and right bag rows are cut off, but the left and right bag rows are still in a state where bags are continuously provided in front and back. In this step H, trimming of both ears of the film is usually performed simultaneously. Prior to this step H, it is usual to make a cosmetic cut using a punching blade to adjust the shape of the bag.

<Step I / Step of Cutting into Individual Bags (Step of Cutting Bags)> In Step I, cutting is performed in the film width direction along the center line of the side seal portion (9) to form individual bags. This is the bag cutting process. The cutting at this time is performed by, for example, a guillotine type cutter.

<Step J / Derivation Step> Step J is the same as the previous step I
This is a step of drawing out the bags separated individually in the downstream. The delivered bags are counted or stored in a box, either manually or mechanically.

<Elimination of Defective Products> In the present invention, when performing the above-described steps, in the cooling step E, the gap between the upper and lower cooling plates (6), (6) is formed by the cooling plate ( 6) is detected by the eddy current type displacement sensor (10) provided, and when there is an abnormality in the detected value, a command not to cut in the film width direction in the process I is issued, and a plurality of front and rear cuts (for example, 2 (Or more) of individual bags are connected to the derivation process J in a state of being connected.

The cooling plates (6) and (6) are divided into two types, a main cooling and a secondary cooling.
When it is divided into stages, the eddy current displacement sensor (10) is usually provided on the cooling plate (6) in the main cooling stage,
It may be provided on the cooling plate (6) in the secondary cooling stage.
The eddy current displacement sensor (10) is composed of upper and lower cooling plates (6),
The other cooling plate (6) at one corner of one of the cooling plates (6)
It suffices if it is provided on the side opposite to. Upper and lower cooling plates (6), (6)
Although a film is interposed between them, the eddy current displacement sensor (10) detects metal, and is not affected by the presence or absence of the film.

Here, the eddy current type displacement sensor (10) is a kind of proximity sensor, and can accurately detect a gap of, for example, about 1 μm. Therefore, if the straw (3) is bitten in the corner seal part (5) forming step D, the gap between the upper and lower cooling plates (6), (6) becomes large, and it is determined whether there is any abnormality. You can grasp immediately.

The eddy current displacement sensor (10) is a control device (11)
And if there is an abnormality in the detected value, a command not to cut in the film width direction in the process I is issued. As a result, a plurality of individual bags (for example, two) are connected to the deriving process J in a state of being connected in series (the bags are connected in the width direction of the film. (Two sets of individual bags will be led out in a state where they are connected continuously.) However, since these connected bags can be clearly distinguished from those cut into individual bags, defective products can be reliably removed from the system. Can be eliminated.

<Contents> The individual bags thus obtained are filled with various liquid contents such as a liquid detergent, a liquid seasoning, and a beverage from the opening, and then the opening is opened. Heat seal and distribute. In order to facilitate opening when the standing pouch is used, it is preferable that a cut line or a perforation is provided at a portion of the corner seal portion (5) on the distal end side of the straw (3). The viscosity of the liquid content to be filled is arbitrary from low viscosity to high viscosity.

<Operation> In the present invention, in the above cooling step E, the gap between the upper and lower cooling plates (6), (6) is
It is detected by an eddy current displacement sensor (10) provided on the cooling plate (6).
Since a command not to cut the film in the width direction is issued, the bag is flowed to the deriving step J in a state where a plurality of bags are continuously connected in front and rear, and based on the sealing failure of the heat sealing portion around the straw accommodating portion. Defective products can be reliably excluded from the system.

[0033]

The present invention will be further described with reference to the following examples.

Embodiment 1 FIG. 1 is a block diagram showing an example of a manufacturing process of a standing pouch according to the present invention. FIG. 2 is an explanatory view showing an example of the hot plate (4) used in the step D, wherein (a) is a plan view and (b) is a side view. FIG. 3 is an explanatory view showing an example of the cooling plate (6) used in the step E, (a) is a plan view,
(B) is a side view. FIG. 4 is an explanatory diagram showing the flow of the film in steps B to I. FIG. 5 is an explanatory diagram showing the flow of bags in the derivation step of step J. FIG. 6 is a front view showing an example of a standing pouch obtained by the method of the present invention.

A thickness of 15 μm as an example of the base film
And a long linear low-density polyethylene film having a thickness of 150 μm as an example of the sealant layer. Printing was performed on the inner surface side of the base film in advance. The base film was dry-laminated with a sealant layer to form a raw film.

In the step A, the raw film is set on a raw material supply roll, the raw film drawn out therefrom is cut in half, and then cut in half (cut into half widths). 1) was sent to the downstream in a state where it was separated into high and low positions.

The raw film is supplied at a constant speed in this step A in order to keep the tension constant, but is buffered in the step A, and in the next step B and thereafter, the film is formed as an individual bag. Intermittent running was performed with the width corresponding to one pitch.

In the subsequent step B, the corresponding portions of both the lower and upper half films (1) and (1), which are adjacent corners of two bags adjacent to each other in the subsequent process. Then, the bulge (2) bulging outward to accommodate the straw (3) is sandwiched between molds while the film is heated, and pressed against the mold using compressed air and vacuum.
It was molded in units of two left and right parts. At this time, the recess (2) was formed so that the upper and lower half films (1) and (1) were formed half-body.

In step C, the lower half-cut film
In the dent (2) of (1), put a straw made of high-density polyethylene.
(3) was placed using a vacuum grip device while sending from the pipeline. A straw having an outer diameter of 10.4 mm, an inner diameter of 9.0 mm, and a length of 18.0 mm was used as the straw (3).

In step D, a straw is placed in the recess (2).
Attach the upper half-cut film (1) to the lower half-cut film (1) on which (3) is placed, and contact the hot plates (4) and (4), which are operated by air cylinders, from above and below. The area around the two dents (2) was heated. This heating operation was performed in two stages of preheating and main heating.

In the step E, the cooling plates (6), (6) operated by an air cylinder are brought into contact with the portions heated in the preceding step D from above and below, so that the two dents (2) around the left and right are formed. Was cooled. This cooling operation was performed in two stages of main cooling and secondary cooling. The cooling plates (6), (6) are the hot plates (4),
The same shape as in (4) was used.

By the heating step D and the cooling step E, the left and right two corner seal portions (5) were formed.

In step F, the half-cut film (1),
Run the bottom film (7), (7) in a state of being folded into a V-shape using a triangular plate along both side surfaces of (1), and punching holes (P) by punching where necessary. From
Bottom films (7) and (7) were inserted between the films from both sides of the upper and lower half films (1) and (1) using a disc and a spatula jig. Then, heat sealing is performed by a sealer, and then cooling is performed.
(8) was formed.

In step G, heat sealing was performed in the width direction of the film to form a side seal portion (9) as an individual bag. At this time, the heat melting by the sealer was divided into three stages, and the cooling was performed in two stages.

Prior to the next step H, a decorative cut for adjusting the shape of the bag was performed using a punching blade.

In the step H, the running film was cut along the center line of the film by applying a cutter blade from above the film so that the film was cut into right and left bags. Even after the release, the bags are still connected to each other in the left and right bag rows. At this time, trimming of both ends of the film was performed.

In step I, the film was cut in the width direction of the film along the center line of the side seal portion (9) using a guillotine-type cutter to form individual bags.

In the step J, the bags separated in the previous step I were led out downstream, and the led out bags were counted manually and stored in a box.

When performing the above-mentioned various steps, the upper and lower cooling plates are used in the main cooling stage of the above-mentioned cooling step E.
The gap between (6) and (6) is attached to the upper cooling plate (6) by an eddy current type displacement sensor (“E
X-200 ", with amplifier unit) (10), and when the detected value deviates from the specified value by 100 μm or more, it is determined that there is an abnormality, and the control device (11) issues a command not to cut to the process I. Thus, control was performed so that the flow to the derivation step J was continued with the two individual bags of the front and rear connected in series.

32,000 straws (3) which have been confirmed in advance for all products to have the dimensions (outer diameter 10.4 mm) of the above rating
Among them, 200 pieces with dimensions of outside diameter (10.8mm) protruding from the above-mentioned recess (2) were intentionally mixed at random (different colors) and the above-mentioned processes were carried out. The total number of straws (3) in the dents (2)
It flows to the derivation process J as individual connected products (along with the other of the left and right connected products), and the others are individual bags as the derivation process J
The defective product was excluded from the system.

When the output data from the eddy current type displacement sensor (8) was viewed, the detected value fluctuated within a specified range of ± 10 μm.
Was found to exceed.

[0052]

As described in the section of operation, in the present invention, in the cooling step E, the upper and lower cooling plates (6),
The gap between (6) is detected by an eddy current type displacement sensor (10) provided on the cooling plate (6), and if there is an abnormality in the detected value, cutting in the film width direction in Step I is not performed. Since the command is issued, the bag is flowed to the derivation process J in a state where a plurality of bags are connected in front and rear, and defective products based on the sealing failure of the heat sealing part around the straw accommodating part are reliably removed from the system. can do.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a manufacturing process of a standing pouch according to the present invention.

FIG. 2 is an explanatory view showing an example of a hot plate (4) used in a step D, wherein (a) is a plan view and (b) is a side view.

FIG. 3 is an explanatory view showing an example of a cooling plate (6) used in a step E, (a) is a plan view, and (b) is a side view.

FIG. 4 is an explanatory diagram showing a flow of a film in steps B to I.

FIG. 5 is an explanatory diagram showing a flow of a bag in a deriving process of a process J.

FIG. 6 is a front view showing an example of a standing pouch obtained by the method of the present invention.

[Explanation of symbols]

 (1) ... half-cut film, (2) ... dent, (3) ... straw, (4) ... hot plate, (5) ... corner seal, (6) ... cooling plate, (7) ... bottom film, ( 8) ... bottom seal, (9) ... side seal, (10) ... eddy current displacement sensor, (11) ... control device, (P) ... punch hole

Claims (3)

[Claims] In producing a standing pouch, a straw (3) serving as a spout is provided inside one corner of a bag.
Adjacent to the left and right when the direction of film advance is the front and back, the width of the film is left and right
An outer bulge (2) for accommodating the straw (3) is formed in two adjacent left and right units at the adjacent corners of each bag, and the straw (3) is inserted into the dent (2). Is supplied, and then the hot plates (4), (4) are brought into contact with the cooling plate (6),
Forming a corner seal portion (5) by sealing around the two dents (2) on the left and right by contact of (6); and, in the cooling step, upper and lower cooling plates (6), (6) The gap between them is detected by the eddy current displacement sensor (10) provided on the cooling plate (6), and if there is an abnormality in the detected value, a command not to cut in the film width direction is issued,
A method for manufacturing a standing pouch, characterized in that a plurality of individual bags for the front and rear are flowed to the derivation step in a state of being connected in series. 2. In manufacturing a standing pouch having a straw (3) serving as a spout inside one corner of a bag,
When the advancing direction of the film is front and back, and the width direction of the film is left and right, the raw film unwound from the raw material supply roll is cut in half,
Step A, in which each of the half-cut films (1), (1) is sent to the downstream in a state where the half-cut films (1) are separated into high and low positions, a predetermined portion of the lower half-cut film (1) or a corresponding portion of both half-cut films (1). In the subsequent process, two bulges (2) bulging outward for accommodating the straw (3) are placed in the adjacent corners of the two bags adjacent to each other when they are made into individual bags. Step B of molding in minutes, Step C of supplying a straw (3) into the recess (2) of the lower half-cut film (1), and placing the straw (3) in the recess (2) The upper half-cut film (1) is superimposed on the lower half-cut film (1) and the hot plates (4),
(4) abutting the two dents in the left and right units (2) in the step D for heating around the corner seal part (5), in order to complete the cooling plate (6 ), (6) abutting the two dents (2) in units of the left and right to cool around the periphery (2); V-shape between both sides of the upper and lower half-cut films (1), (1) Step F, in which the bottom film (7), (7) is inserted into the bag and heat-sealed to form a bottom seal portion (8) as an individual bag, heat-sealing is performed in the film width direction. Step G for forming side seal portions (9) when individual bags are formed, cutting H along the center line of the film and separating into left and right bag rows, center H of the side seal portions (9) The film is cut in the film width direction along the line, and a bag cutting process I, which is an individual bag, and the bags separated in the previous process I are led out downstream. The degree J, embodying process, and the cooling in the step E, the upper and lower cooling plate (6), the eddy current type displacement sensor provided in (6) the cooling plate the gap between (6)
(10), when there is an abnormality in the detected value, a command not to cut in the film width direction in the above-mentioned step I is issued, and the deriving step J is performed in a state in which a plurality of front and rear individual bags are continuously provided. The method for producing a standing pouch according to claim 1, wherein the pouch is made to flow. 3. The heating operation in step D is performed in two stages of preheating and main heating, and / or the cooling operation in step E is performed in two stages of main cooling and secondary cooling. The method for producing a standing pouch according to claim 1, wherein: