JP2002179008A - Package having easy-to-open property and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable both an easy-to-open property and an anti-bag breakage property to be satisfied although a package is manufactured by a pillow packaging machine. SOLUTION: A package 1 is manufactured by using a pillow packaging machine. Some stored items are filled in a three-side seal bag made of film having a vertical seal segment 2, an upper lateral seal segment 3, and a lower lateral seal segment 4. The vertical seal segment 2 and the lower lateral seal segment 4 have such a melting and adhering strength as one not to cause themselves to be peeled off under a usual used state of the bag. To the contrary, the upper lateral seal segment 3 has a melting and adhering strength of easy-to- open property, so that the upper lateral seal segment 3 is peeled off to easily open and it shows a superior resistance to breakage of bag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package which can be easily opened and has an easy-opening property with excellent bag-breaking resistance and a method for producing the same.

[0002]

2. Description of the Related Art An example of a conventional filling and packaging method using a pillow packaging machine will be described.

In this conventional filling and packaging method, a pillow wrapping machine is used, and a package 100 is continuously manufactured through the following steps.

FIG. 3 shows a state in which the feeding of the film 121 is completed during a steady operation, in which only the ironing roll 115 is closed, the horizontal sealing machine 116, the pressing plate 117, and the horizontal sealing and cutter 118 are open. Horizontal sealing portion 101 on the upper end side of the package 100a and the cylindrical body 122
Are not separated from the horizontal seal portion 101 on the lower end side of the.

After the above, the cylinder 122 is filled with a predetermined amount of viscous material from the viscous material loading loader 111, and then the ironing roll 115 is opened and the feed roll 11 is opened.
By rotating 4, a cylindrical body 122 filled with a viscous substance and a film 121 following the same together with the package body 100a before separation are intermittently fed out by a predetermined length.

In this case, the unrolled film 121
Is formed through a plurality of payout rolls 119.
While passing through, the both side edges are overlapped to form an overlapped portion. Next, the overlapped portion is heat-sealed while passing through the vertical sealing machine 113 to form a vertical sealed portion, and becomes a continuous tubular body 122. Then, by closing the ironing roll 115 immediately before stopping the feeding of the film 121, an ironing portion 123 is formed in which the flattened viscous substance is not interposed by pressing the upper part of the cylindrical body 122 filled with the viscous substance.

By closing the horizontal sealing machine 116 and the horizontal sealing machine / cutter 118, the horizontal sealing sections 101 are formed at the upper and lower ends of the cylindrical body 122 filled with the viscous material, and at the same time, the lower horizontal sealing section 101 is centered. At the same time, the package 100a before separation is flattened by narrowing both sides by closing the pressing plate 117.

[0008] The horizontal sealing machine 116, the pressing plate 117 and the horizontal sealing machine / cutter 118 are opened, and the manufactured package 100 is dropped on the conveyor 130 and transported in the direction of the arrow. By the above-mentioned method, a bag in which the seal portion composed of the vertical seal portion and the horizontal seal portion has an easy-opening property is manufactured (see JP-A-4-114810).

[0009]

In the above prior art,
If the welding strength is reduced in order to make the horizontal seal portion easy to open, when the ironing roll is opened (see the above-described process), the welded portion may not yet be completely cooled, and the filled viscosity The load of the object is applied to the lower horizontal seal portion and the lower vertical seal portion, and there is a possibility that the seal portion is peeled off. In addition to the problems during the bag-making and filling step, easily-openable bags generally have inferior bag-breaking resistance. Therefore, a special member or process is required to prevent peeling during the bag-making and filling process, and even though there are optimal conditions for opening the bag, the sealing strength must be increased to maintain bag-breaking resistance. I didn't get it.

The present invention has been made in view of the above-mentioned unresolved problems of the prior art, and has an easy-opening property and a tear-resistant bag despite being a package manufactured by a pillow packaging machine. It is an object of the present invention to realize a package that can satisfy both properties and has an easy opening property even for a relatively heavy package, and a method of manufacturing the package.

[0011]

In order to achieve the above object, an easily-openable package of the present invention is manufactured by a pillow wrapping machine from a film having a heat-sealing property, and the inside is filled with an object. A three-sided sealed bag, wherein the three-sided sealed bag is sealed by a heat-sealed vertical seal portion, a lower horizontal seal portion, and an upper horizontal seal portion, and the upper horizontal seal portion is easily opened. It has a characteristic welding strength.

According to the method for manufacturing a package having easy-opening properties of the present invention, a film having heat-sealing properties is intermittently fed out to form a three-side sealed bag, and an object is filled in the three-side sealed bag. In a method of manufacturing a package using a pillow packaging machine, a step of forming the overlapped portion by curving the film having heat welding properties and overlapping both side edges thereof, and vertically welding the overlapped portion by heat welding A step of forming a continuous tubular body by forming a seal portion, a step of sequentially filling the tubular body with a contained object, and an upstream portion of the filled tubular object in the tubular body. Forming a welded portion provided with a strong weld strength region serving as a lower horizontal seal portion and a weak weld strength region serving as an upper horizontal seal portion by heat welding; and forming the strong weld strength region and the weak weld strength region. At the border of It is characterized in that and a step of bisecting the welded portion.

[0013] In the above-mentioned method for manufacturing a package having easy opening properties, a horizontal sealing machine including a first horizontal sealing machine and a second horizontal sealing machine, each of which can independently set welding conditions, is used. Using a horizontal sealing machine consisting of a first horizontal sealing machine and a second horizontal sealing machine that can obtain a strong welding strength area and a weak welding strength area depending on the welding temperature, or can set welding conditions independently of each other. A strong welding strength region and a weak welding strength region are obtained by the welding pressure.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of a package having easy-openability according to the present invention will be described.

As shown in FIG. 1A, the package 1 is
It is manufactured using a pillow wrapping machine, and is sealed in a film bag having a heat-sealing property by a vertical seal portion 2, an upper horizontal seal portion 3 and a lower horizontal seal portion 4,
It is filled with granular, powdery or liquid objects.
The vertical seal portion 2 and the lower horizontal seal portion 4 have a welding strength that does not peel off in a normal use state as a bag, whereas the upper horizontal seal portion 3 has a welding strength that is easy to open. After the upper horizontal seal portion 3 is peeled off and opened, a required amount of the object is taken out and used, and the remaining object can be stored.

The film having heat welding properties may be either a single layer or a film having a laminated structure.
As shown in the figure, when a film having a laminated structure in which a sealant layer 5c having excellent heat welding property is laminated on a base layer 5a having a large mechanical strength via an intervening layer is used,
A package having mechanical strength, welding strength and flexibility suitable for storage can be obtained.

A film having heat welding properties can be obtained by changing the welding conditions, that is, by changing the welding pressure for a fixed welding temperature or by changing the welding temperature for a fixed welding pressure. The welding strength of the welding portion can be easily changed.

The base layer 5a is made of polypropylene, polyamide, polyester or the like, the sealant layer 5c is made of a polyethylene or polypropylene heat-adhesive resin or the like, and the intervening layer 5b is made of low density polyethylene or the like. Used.

Next, an embodiment of a method of manufacturing a package having easy-openability according to the present invention will be described. The method for manufacturing an easily-openable package according to the present embodiment uses a pillow packaging machine 10 as shown in FIG. To manufacture.

FIG. 2 shows a state at the time of completion of the feeding of the film 5 having the heat welding property during the steady operation. An openable and closable first horizontal sealing machine 16 and a second horizontal sealing machine 17 are provided on the flattened ironing section 7 which is flattened by closing the openable and non-openable ironing roll 15 and separating the upper opening of the package 1a before separation. The horizontal sealing machine was closed, and from the upstream side to the downstream side, a strong welding strength region serving as a lower horizontal seal portion 4 having a large welding strength and a weak welding strength region serving as an upper horizontal sealing portion 3 having a small welding strength were provided. The welded portion is formed, the openable press and cutter 18 is opened, and the manufactured package 1 is conveyed to the conveyor 30.
Dropping it up.

In the present invention, the first horizontal sealing machine 16 and the second horizontal sealing machine 17 can set welding conditions independently of each other. The first horizontal sealing machine 16 and the second
The horizontal sealing machine 17 has substantially the same welding pressure, and the welding temperature of the first horizontal sealing machine 16 is set to a higher temperature at which strong welding strength can be obtained, whereas the welding temperature of the second horizontal sealing machine 17 is weak. By setting the temperature at a lower temperature at which the welding strength is obtained, the weak welding strength region serving as the upper horizontal seal portion 3 having easy-opening properties and the strong welding strength region serving as the lower horizontal seal portion 4 having the strong welding strength are simultaneously formed. Form.

However, the present invention is not limited to this.
And the second horizontal sealing machine 17 has substantially the same welding temperature,
The welding force of the first horizontal sealing machine 16 at the time of welding is made larger than that of the second horizontal sealing machine 17 to obtain a strong welding strength region where the welded portion does not peel off. Can be made smaller than that of the first horizontal sealing machine 16 so as to obtain a weak welding strength region which becomes the upper horizontal sealing portion 4 having an easy-opening property in which the welding portion can be easily peeled off.

After the above, a predetermined amount of objects to be stored is supplied from the hopper 11 and sequentially filled in the cylindrical body 6.

At this time, since the lower lateral seal portion 4 has a high welding strength, there is no possibility of peeling.

Ironing roll 15, first horizontal sealing machine 1
After the 6 and the second horizontal sealing machine 17 are opened, by rotating the feed roll 14, the cylindrical body 6 and the film 5 following the cylindrical body 6 together with the package 1a before separation are fed out by a predetermined length.

The unwound film 5 is guided to the former 12 through a plurality of unwinding rolls 20 and 21, and is curved into a cylindrical shape while passing through the former 12, so that both side edges are overlapped to form an overlapped portion. Is done. Next, the overlapped portion is heat-welded while passing through the vertical sealing machine 13 to form the vertical seal portion 2 having a high welding strength, and the continuous cylindrical body 6 is formed.

On the other hand, when the portion of the cylindrical body 6 filled with the object has passed the ironing roll 15, the ironing roll 15 is closed and the upstream side of the filled object in the cylindrical body 6 is removed. The flattened portion 7 is formed by flattening.

By closing the first horizontal sealing machine 16 and the second horizontal sealing machine 17 and heat-welding the ironing portion 7, the weak welding strength region which becomes the easily openable upper horizontal sealing portion 3 and the strong welding strength are obtained. A welded portion provided with a strong welding strength region serving as the lower lateral seal portion 4 is formed to manufacture the package 1a before separation.

The press / cutter 18 is closed, and the strong welding strength region serving as the lower horizontal seal portion 4 and the weak welding strength region serving as the upper horizontal seal portion 3, which are the welding portions to which the package 1 a before separation is connected, are defined. The package 1 is manufactured by sandwiching and dividing the boundary between the two.

EXPERIMENTAL EXAMPLE 1 Using a vertical pillow bag simultaneous filling and packaging apparatus as shown in FIG.
Was packed at a high temperature (filling temperature: 80 ° C.). The folding diameter of the film is 500 mm, and the seal width is 25 for both the vertical seal, upper horizontal seal and lower horizontal seal.
mm, the width of the bag is 500 mm, and the height of the bag is 750 m
m. As the film, a stretched polyamide film of 25 μm was used as a base layer, and an unstretched polypropylene-based sealant film of 60 μm (“TAF manufactured by Tocelo Corporation”) was used.
# 60 ") was used as a sealant layer, and a material obtained by extruding and laminating a molten low-density polyethylene resin (intermediate layer 15 μm) between two films forming the base material layer and the sealant layer was used.

The horizontal sealing machine is composed of a first horizontal sealing machine and a second horizontal sealing machine as shown in FIG. 2, and has a structure capable of independently setting welding conditions such as welding temperature and pressure. Using. The welding temperature for producing the lower horizontal sealing portion in the first horizontal sealing machine is 150 ° C., and the welding temperature for producing the upper horizontal sealing portion in the second horizontal sealing machine is 120 °.
The welding temperature in the vertical sealing machine is 150
Degree. Further, in all of the first horizontal sealing machine, the second horizontal sealing machine and the vertical sealing machine, the welding time while the sealing machine was closed was 1 second, and the welding pressure during welding was 0.2 MPa. As a result, a margarine-filled packaging bag was obtained. The margarine-filled packaging bag obtained according to the above specifications was cooled and solidified in a state where the external shape was shaped after high-temperature filling, and the product was evaluated.

As a result, the seal strength of the upper horizontal seal portion was 7.25 N / 15 mm width, and the seal strength of the other seal portions (lower horizontal seal portion, vertical seal portion) was 48.05.
A packaging bag of N / 15 mm width was obtained.

In the packaging bag, the upper horizontal sealing portion to be opened by pulling the film by hand has a sufficient easy-opening property, and the lower horizontal sealing which is the other sealing portion does not cause the root of the seal portion or the base material to break. The portion and the vertical seal portion had a welding strength sufficiently satisfying the bag breaking resistance.

Experimental Example 2 The pressing force at the time of welding with the first horizontal sealing machine was 0.3 MPa, and the pressing force at the time of welding with the second horizontal sealing machine was 0.2 MPa.
The pressure welding temperature at the time of welding with a vertical and horizontal sealing machine was 0.3 MPa. In addition, the first horizontal sealing machine and the second horizontal sealing machine
In both the horizontal sealing machine and the vertical sealing machine, the welding time while the sealing machine was closed was 1 second, and the welding temperature was 120 degrees. As a result, a margarine-filled packaging bag was obtained.

Experimental Example 1 except that the sealing conditions were different.
The same equipment, method and packaging specifications were used. As a result, the seal strength of the upper horizontal seal portion is 7.17 N / 15 mm width, and the other seal portions (lower horizontal seal portion, vertical seal portion)
A packaging bag having a seal strength of 50.03 N / 15 mm width was obtained.

In the above-mentioned packaging bag, the upper horizontal seal portion to be opened by pulling the film by hand has a sufficient easy-opening property, and the lower horizontal seal, which is another seal portion, does not cause any breakage of the seal portion and the base material. The portion and the vertical seal portion had a welding strength sufficiently satisfying the bag breaking resistance.

According to the present invention, a packaging bag is obtained in which only the upper horizontal seal portion to be opened has easy-opening properties and the other seal portions have a strong welding portion. And, as shown in the examples, the film itself should be specially opened in spite of the different sealing mode as described in the embodiment (specification of material, resin composition, thickness, sealing area, surface properties, surface treatment, etc.). Can be achieved without the need to change (however, it does not prevent the specification of the seal portion from being additionally changed in the manufacturing method of the present invention). Therefore, it is easy to manufacture the film itself used for packaging. Further, as described above, since both easy-openability and bag-breaking resistance can be achieved, high-temperature filling packaging in which peeling of the seal portion during production is a problem, or margarine of 5 kg or more,
It can be applied to viscous heavy materials such as jams and flower pastes, and can expand the field of application for packaging.

[0038]

Since the present invention is configured as described above, the following effects can be obtained.

The package having an easy-opening property is formed of a three-sided seal bag having a vertical seal portion, a lower horizontal seal portion, and an upper horizontal seal portion which accommodate the objects to be accommodated, and only the upper horizontal seal portion is easily sealed. Since it has openability, it can be easily opened by peeling off the upper horizontal seal portion, and is excellent in bag breakage resistance.

Further, the method of manufacturing a package having easy-opening properties is to efficiently manufacture a package having easy-opening properties having the above-mentioned effects despite simultaneous filling packaging using a pillow packing machine. And productivity is remarkably improved.

[Brief description of the drawings]

FIG. 1 shows an easily-openable package according to the present invention;
(A) is a schematic plan view, and (b) is a schematic cross-sectional view of a laminated film having heat welding property to be used.

FIG. 2 is an explanatory view of a method for manufacturing a package having easy-openability according to the present invention.

FIG. 3 is an explanatory view showing an example of a conventional filling and packaging method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Package 1a Package before separation 2 Vertical seal part 3 Upper horizontal seal part 4 Lower horizontal seal part 5 Film 5a Base material layer 5b Intermediate layer 5c Sealant layer 6 Cylindrical body 7 Ironing part 10 Pillow packaging machine 11 Hopper 12 Former 13 Vertical Sealing Machine 14 Feed Roll 15 Ironing Roll 16 First Horizontal Sealing Machine 17 Second Horizontal Sealing Machine 18 Press and Cutter 18a Cutter 19 Registration Mark Sensor 20, 21 Feeding Roll

Claims (4)

[Claims] 1. A package comprising a three-sided seal bag, which is manufactured by a pillow wrapping machine from a film having a heat-sealing property and is filled with an object, wherein the three-sided seal bag is heat-sealed. A package having easy-openability, wherein the package is sealed by a vertical seal portion, a lower horizontal seal portion, and an upper horizontal seal portion, and the upper horizontal seal portion has welding strength for easy-openability. 2. A method of manufacturing a package using a pillow wrapping machine for intermittently feeding out a film having heat welding property to form a three-side seal bag and filling an object to be accommodated in the three-side seal bag, A step of forming the overlapped portion by curving the film having the heat welding property and overlapping both side edges thereof, and forming a vertical sealing portion by heat welding the overlapped portion to form a continuous tubular body. Forming, successively filling the cylindrical body with the objects to be stored, and strongly welding the lower part of the cylindrical body by heat-welding an upstream portion of the filled objects to form a lower horizontal seal portion. A step of forming a welded portion provided with a strength region and a weak weld strength region serving as an upper lateral seal portion, and a step of dividing the weld portion into two at a boundary between the strong weld strength region and the weak weld strength region, Have Method for manufacturing a package having a peelable, characterized in. 3. A horizontal sealing machine comprising a first horizontal sealing machine and a second horizontal sealing machine, each of which can independently set welding conditions, wherein a strong welding strength region and a weak welding strength region are set at different welding temperatures. 3. The method for producing an easily-openable package according to claim 2, wherein the package is obtained. 4. A horizontal sealing machine comprising a first horizontal sealing machine and a second horizontal sealing machine, each of which can independently set welding conditions, wherein a strong welding strength region and a weak welding strength region are formed by different welding pressures. 3. The method according to claim 2, wherein
A method for producing a package having the above-mentioned easy opening property.