JP6531359B2 - Stick packaging bag - Google Patents

Description

  The present invention relates to a stick packaging bag using a polymer film and an aluminum foil. In particular, the present invention relates to a stick packaging bag which can be easily opened and the contents can be easily taken out.

  Packaging bags using polymer films are widely used in a variety of products including foods, and their basic functions are the protection of contents, the convenience of handling, and the function of providing information. In recent years, products having various forms and functions in addition to them have been put to practical use and have become indispensable to modern life.

  As an example, stick packaging has conventionally been used for sugar pouch packaging, and it is widely used not only for businesses used in restaurants and coffee shops, but also for home use. This is because the packaging bag fulfills the function of handling convenience by taking the form of sachet packaging in addition to the function of protection of contents, which is the basic function of the packaging bag, and information provision.

  At present, the application of stick packaging is widely spread such as sugar, powder foods such as instant coffee, confectionery products, medicines, detergents and other daily necessities, and the contents are in various forms such as powder, solid powder, solid and liquid. .

  In applications such as foods and pharmaceuticals, a laminate of a polymer film and an aluminum foil is widely used as a material for packaging bags because gas barrier properties including oxygen are required for the purpose of protecting the contents. .

  However, in the case of using an aluminum foil, there has been a problem that pinholes are easily generated due to handling at the time of filling and after packing, transportation at the time of transportation in packing, and contact between bags. On the other hand, the aluminum foil can also contribute to the improvement of the hand cutability by the small elongation. In addition, when the stick bag is unsealed, it is required to be easily tearable by hand to make an opening, and to be easy to take out the contents from the opening.

  Another advantage of the stick packaging is that the packaging manufacturer can reduce the material compared to the three-way seal and the four-way seal, and the production efficiency of the filling is also good.

  In addition, from the consumer side using the stick packaging, it is possible to always take out the contents that have been opened, it is easy to open by hand, it is easy to take out the contents, for example, the hands are clean and the cut is clean It is done.

Japanese Utility Model Application Publication No. 2-127432

  In view of such circumstances, the present invention is intended to provide a stick packaging bag having pinhole resistance and having an easy removal of contents without impairing the conditions of conventional bag making.

As means for solving the above problems, the invention according to claim 1 comprises a laminate in which at least a stretched polyolefin resin film, an aluminum foil, a stretched polyethylene terephthalate film, and a sealant are arranged in this order,
The stretched polyolefin resin film, the aluminum foil, and the stretched polyethylene terephthalate film are laminated by an adhesive for dry lamination,
The stick packaging bag is characterized in that a waist strength in a direction perpendicular to the film transport direction is 30 mN / 15 mm or more.

  The invention according to claim 2 is the stick packaging bag according to claim 1, characterized in that the oriented olefin resin film is an oriented polypropylene film.

  The invention according to claim 3 is the stick packaging bag according to claim 1 or 2, wherein the stretched polyethylene terephthalate film is a hand cut polyethylene terephthalate film.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the stick packaging bag which equipped with pinhole resistance, and also had the ease of taking out of the content, without impairing the conditions of the conventional bag making.

  Further, according to the invention of claim 2, it is possible to provide a stick packaging bag which is wider in terms of bag making conditions.

  Further, according to the invention of claim 3, it is possible to provide a stick packaging bag which is more excellent in openability.

  Further, according to the invention of claim 4, it is possible to provide a stick packaging bag capable of eliminating the occurrence of pinholes by making the laminate strength stronger.

FIG. 1 is a partial cross-sectional schematic view of a laminate constituting a stick packaging bag according to the present invention. FIG. 2 is a perspective view of a loop stiffness tester test piece for measuring the waist strength of the stick packaging bag according to the present invention. FIG. 3 is a perspective view of the stick packaging bag filled with the contents according to the present invention.

  Hereinafter, a mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial cross-sectional schematic view of a laminate constituting a stick packaging bag according to the present invention.

  The laminate (10) is a laminate constituting the stick packaging bag according to the present invention, and from the outside of the packaging bag, an oriented polyolefin resin film (2), an aluminum foil (1), an oriented polyethylene terephthalate film (3), a sealant Layer (4) is laminated. The adhesive layer A (5) bonds the stretched polyolefin film (2) and the aluminum foil (1), and the adhesive layer B (6) bonds the aluminum foil (1) and the stretched polyethylene terephthalate film (3) .

By sandwiching the aluminum foil (1) with the stretched polyolefin resin film (2) and the stretched polyethylene terephthalate film (3), the bending resistance of the stick packaging bag can be increased, and the waist strength can also be increased.

  The stick packaging bag composed of the laminate (10) needs to have a waist strength in the direction perpendicular to the flow direction of the film of 30 mN / 15 mm or more. As a result, when the stick packaging bag is opened, the cut end becomes substantially circular and forms an opening, which makes it easy to take out the contents.

  The oriented polyolefin resin film (2) is disposed on the outer side of the packaging bag of the aluminum foil (1) and aims to increase the bending resistance. In addition to waist strength, pinhole resistance also improves by raising the bending resistance.

If necessary, printing can be performed to display information about the contents, an image of a product, a logo mark, and the like. The printing is preferably performed on the surface of the stretched polyolefin resin film (2) on the side of the aluminum foil (1) from the viewpoint of printing ink surface protection. Although the type of printing ink (7) is not specified, it should be selected in consideration of the adhesion to the stretched polyolefin resin film (2) and, for example, in the case of food, the point of safety. Can.
In addition, the presence of the oriented polyolefin resin film (2) has the effect of protecting the aluminum foil (1) from rubbing and impact during filling, transportation or storage, which also contributes to improvement in pinhole resistance.

  The film can be selected from polyolefin resins such as polyethylene resin and polypropylene resin and used, and a stretched polypropylene film is more preferable in terms of heat resistance and strength. The heat resistance of the stretched polypropylene film is higher than that of the stretched polyethylene film, whereby the range of sealing conditions in bag making becomes wider, which contributes to the improvement of productivity.

  Aluminum foil (1) is used for the purpose of the gas barrier property improvement. The gas barrier property makes it possible to enhance the protection performance of the contents, which is the basic performance as a packaging bag. However, when defects such as pinholes occur, the gas barrier performance is impaired, and one of the basic performance as a packaging bag is lost.

  In the present invention, the bending resistance of the stick packaging bag is increased by sandwiching the aluminum foil (1) with the stretched polyolefin resin film (2) and the stretched polyethylene terephthalate film (3) in order to secure pinhole resistance, and pin resistance is improved. At the same time it tries to raise the waist strength at the same time as the hall nature. In addition, it can be expected that the aluminum foil contributes to the improvement of the hand-cutting property by the small elongation.

  Further, raising the waist strength acts as a repulsive elastic when the stick packaging bag is opened, and the cut end becomes a circle to form an opening, and it becomes easy to take out the contents from the widely spread opening.

  A hand-cut polyethylene terephthalate film can also be used for the stretched polyethylene terephthalate film (3), in which case the stick packaging bag can be easily opened by hand when opening it, and the cut end becomes clear There is also an effect, which also leads to the ease of taking out the contents.

  FIG. 2 is a perspective view of a loop stiffness tester test piece (11) for measuring the waist strength of the stick packaging bag according to the present invention. The laminate is cylindrically shaped at the longitudinal thermal welds (13) along the film flow direction, and the waist strength is measured with this loop stiffness tester specimen (11).

  The measurement measures the waist strength in the direction perpendicular to the film flow direction. The waist strength is a numerical value obtained by measuring the strength when the looped sample is crushed in the diametrical direction, ie, in the direction perpendicular to the film flow direction.

  If the value of the waist strength is high, when the stick packaging bag is opened, the cut edge is circular and a large opening is formed to assist the removal of the contents. As a result of intensive studies, we have found that the waist strength in the direction perpendicular to the film flow direction needs to be 30 mN / 15 mm or more.

  The plastic film layers on the front and back sides sandwiching the aluminum foil (1) are adhered via the adhesive layer A (5) and the adhesive layer B (6) respectively, but by using dry lamination, the adhesive strength is further enhanced and it is bent Also, it is possible to prevent peeling between the laminate layers, etc., and it works well also for pinhole resistance. Although the kind of adhesive is not specifically limited, For example, a two-component curable urethane resin adhesive can be used.

  By the sealant (4), the sealants of the laminate (10) are heat-welded in a form facing each other in the stick packaging and filling machine, and made into a stick packaging bag simultaneously with the filling of the contents. For the sealant (4), for example, low density linear polyethylene (LLDPE) can be used.

  The sealant (4) may be formed by extruding a resin using an extruder, or may be provided by laminating a film for a sealant via an adhesive. From the viewpoint of productivity, film lamination is preferred.

  FIG. 3 is a perspective view of the stick packaging bag (12) filled with the contents (14) according to the present invention. The laminate (10) shown in FIG. 1 is filled with the contents in a stick packaging and filling machine and at the same time the longitudinal heat welds (13) and the transverse heat welds (8) are sealed to form a pouch package . At the time of opening, the intended opening line (9) is manually teared open in a direction perpendicular to the film flow.

  The opened cut has a circular opening due to the impact resilience represented by the waist strength of the stick packaging bag (12), so the contents (14) can be easily taken out. The form of the contents may be powder, solid powder, solid, liquid or the like.

  The packaging bag configured in this manner is a stick packaging bag that has pinhole resistance without impairing the conditions of conventional bag making, and also has the ease of taking out the contents.

  A laminate was prepared according to the layer configuration shown in FIG.

Example 1
The layer configuration and material configuration of the laminate are as follows from the outside of the packaging bag.
Stretched polypropylene film (thickness 20 μm) / printing ink / dry lamination adhesive / aluminum foil (thickness 7 μm) / dry lamination adhesive / hand cut polyethylene terephthalate film (thickness 14 μm) / dry lamination adhesive / sealant (thickness 30 μm).

Example 2
The layer configuration and material configuration of the laminate are as follows from the outside of the packaging bag.
Stretched polypropylene film (thickness 25 μm) / printing ink / dry lamination adhesive / aluminum foil (thickness 7 μm) / dry lamination adhesive / hand cut polyethylene terephthalate film (thickness 14 μm) / dry lamination adhesive / sealant (thickness 30 μm).

  That is, Example 2 is the same as Example 1 except that the thickness of the outermost stretched polypropylene film was 25 μm.

Example 3
The layer configuration and material configuration of the laminate are as follows from the outside of the packaging bag.
Stretched high density polyethylene film (Thickness 30 μm) / Printing ink / Dry lamination adhesive / Aluminum foil (Thickness 7 μm) / Dry lamination adhesive / Hand cut polyethylene terephthalate film (Thickness 14 μm) / Dry lamination adhesive / Sealant (Thickness 30 μm).

  That is, Example 3 is the same as Example 1 except that the stretched polypropylene film (thickness 20 μm) of the outermost layer is a stretched high-density polyethylene film (thickness 30 μm).

Comparative Example 1
The layer configuration and material configuration of the laminate are as follows from the outside of the packaging bag.
Stretched polyethylene terephthalate film (thickness 12 μm) / printing ink / dry lamination adhesive / aluminum foil (thickness 7 μm) / dry lamination adhesive / hand cut polyethylene terephthalate film (thickness 14 μm) / dry lamination adhesive / sealant ( 30 μm thick).

  That is, Comparative Example 1 is the same as Example 1 except that the stretched polypropylene film (thickness 20 μm) of the outermost layer is a stretched polyethylene terephthalate film (thickness 12 μm).

Comparative Example 2
The layer configuration and material configuration of the laminate are as follows from the outside of the packaging bag.
Stretched polypropylene film (thickness 20 μm) / printing ink / extruded polyethylene (thickness 15 μ) / aluminum foil (thickness 7 μm) / extruded polyethylene (thickness 15 μ) / sealant (thickness 30 μm).

  That is, Comparative Example 2 is the same as Example 1 in the outermost layer of the stretched polypropylene film (thickness 20 μm), but the extruded polyethylene (thickness 15 μ) is used without using a dry lamination adhesive on the front and back of the aluminum foil. It is the structure which omitted the polyethylene terephthalate film (14 micrometers in thickness).

<Evaluation method>
Evaluation items and evaluation methods are as follows.

(Hip strength)
A test piece of 15 mm × 100 mm is bent on a loop and subjected to longitudinal thermal welding to form a loop stiffness tester test piece. The strength at which the test pieces were crushed in the direction perpendicular to the flow direction of the film was measured using a loop stiffness tester. The unit is mN / 15 mm.

(Number of pinholes)
The laminate is wound and fixed on two opposing disks of the Gelboflex tester. The bending process was performed by adding a twist to the cylindrical laminated body. The conditions of twisting are as follows: 3.5 inches of shrinkage to a twist angle of 440 degrees in a test environment of 25 ° C., and then a process of 2.5 inches of contraction without twisting is counted for the number of pinholes when repeated 300 times did. The unit is an individual.

(Ejectability)
After filling the contents and making a bag, it was opened to evaluate the ease of taking out the contents. The contents contained 5 pieces of solid powder.
Evaluation criteria are as follows.
○: All contents can be taken out of the bag within 5 times.
Fair: 5 or more swinging times are required to take out all the contents.
X: It is difficult to take out all the contents only by the drawing out.

(Sealing acceptable)
The presence or absence of heat dripping under sealing conditions of 0.2 MPa and 1 second is visually confirmed.
○: There is no thermal effect up to a temperature range of 180 ° C.
Fair: no thermal effect up to a temperature range of 160 ° C.
X: There is no thermal effect up to a temperature range of 140 ° C.

<Evaluation result>
The evaluation results are shown in Table 1.

In the waist strength, Example 2 and Example 3 are higher than Example 1. In Example 2, the thickness of the outermost stretched polypropylene film (thickness 20 μm) is 25 μm, and in Example 3, the outermost stretched polypropylene film (thickness 20 μm) is stretched and high density polyethylene It is considered to be due to the film (thickness 30 μm). In the present invention, since the standard is 30 mN / 15 mm or more, Examples 1 to 3 show good results, but Comparative Example 1 and Comparative Example 2 have inadequate levels.

  The occurrence of pinholes is not observed in Examples 1 to 3, but four are found in Comparative Example 1. This is considered to be due to the influence of the thickness of the outermost layer of the stretched polypropylene film (20 μm to 30 μm) as the stretched polyethylene terephthalate film (12 μm in thickness). Although two are seen in Comparative Example 2, it is considered that there is a difference in adhesive strength because the extrusion polyethylene (15 μm in thickness) is used for adhesion of aluminum without using a dry lamination adhesive.

  As for the removability, Examples 1 to 3 show good results, while Comparative Examples 1 and 2 are not suitable. In Examples 1 to 3, it is considered that the opening is opened in a circular shape and the removal property is improved because the waist strength is strong.

  On the contrary, in Comparative Example 1 and Comparative Example 2, it is considered that the size of the opening is not sufficient because the waist strength is low, or because the circular opening can not be formed, the removal of the contents is disturbed. .

  Although there were some differences in seal temperature conditions in Example 3 with respect to seal tolerance, good or usable results were obtained for all test pieces. The sealant is considered to be common to all the test pieces.

The result of Example 3 of seal acceptance is the outermost layer stretched polypropylene film (thickness 20 μm)
It is considered that the heat resistance is lowered compared to Example 1 because the film is a stretched high density polyethylene film (thickness 30 μm), and it is considered necessary to pay attention to the sealing conditions.

  From the above results, it can be seen that in Examples 1 to 3 the respective characteristics are well balanced and excellent as compared with Comparative Example 1 and Comparative Example 2.

  From these results, it is verified that the present invention makes it possible to provide a stick packaging bag having pinhole resistance and having the ease of taking out contents without impairing the conditions of conventional bag making. It was possible.

1: Aluminum foil 2: Stretched polyolefin resin film 3: Stretched polyethylene terephthalate film 4: Sealant 5: Adhesive layer A
6 ・ ・ ・ Adhesive layer B
7 · · · Printing ink 8 · · · horizontal thermal welding portion 9 · · · scheduled opening line 10 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 12 stick packaging bag 13 · · · longitudinal Heat welded part 14 ... contents

Claims (3)

At least an oriented polyolefin resin film, an aluminum foil, an oriented polyethylene terephthalate film, and a laminate in which a sealant is disposed in this order,
The stretched polyolefin resin film, the aluminum foil, and the stretched polyethylene terephthalate film are laminated by an adhesive for dry lamination,
A stick packaging bag characterized in that a waist strength in a direction perpendicular to the film transport direction is 30 mN / 15 mm or more.   The stick packaging bag according to claim 1, wherein the oriented polyolefin resin film is an oriented polypropylene film.   The stick packaging bag according to claim 1 or 2, wherein the stretched polyethylene terephthalate film is a hand cut polyethylene terephthalate film.