JP2014162538A - Self-standing packaging bag and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-standing packaging bag excellent in bag production processability, excellent in opening property when filling content, having self-standing property, and excellent in pouring property when refilling and to provide a production method thereof.SOLUTION: A self-standing packaging bag 100 comprises: a surface film 101 and a back film 102 formed of packaging material formed by laminating a base material layer and a sealant layer; and a pouring port 1 disposed on a corner of an upper end. On a seal surface side of the sealant layer, a belt-like pattern in which recess parts 4 and salient parts 5 are alternatively arranged, is disposed in an oblique direction so that one corner side of the upper end is in the upper part.

Description

  The present invention relates to a self-supporting packaging bag and a method for manufacturing the same. The present invention relates to a self-supporting packaging bag for packaging contents to be refilled into a container for repeated use and a method for manufacturing the same.

  Self-supporting packaging bags are increasingly used to refill liquid contents such as shampoos, rinses, body soaps, liquid detergents, and toiletry products represented by softeners into plastic containers that are used repeatedly. .

  The self-supporting packaging bags for refilling use thinner packaging materials year by year in response to the recent environmental aspects of reducing volume of waste and reducing consumption of fossil fuels. For this reason, by making the sealant layer into a multilayer structure, a high-density resin layer is provided in the intermediate layer, and a device has been devised to develop a waist even when it is thin. Moreover, in order to improve the handling at the time of bag making, it exists in the tendency to reduce the additive added when forming a sealant layer.

  However, it is difficult to impart physical irregularities to the surface of polyolefin-based sealants that are formed by the inflation method or the casting method, and it was only possible to impart fine irregularities by adding particles such as zeolite and silica. . This fine unevenness did not satisfy the required function.

  Making the surface of such a polyolefin resin uneven is performed in the field of manufacturing decorative sheets used for building materials and the like. For example, there are the following methods for manufacturing a decorative sheet.

  Between the embossed cooling roll and the pressure roll, the molten olefin-based transparent thermoplastic resin is extruded, cooled and solidified, and embossed simultaneously to obtain a transparent embossed sheet. Further, the back surface of the embossed sheet is subjected to corona treatment, an adhesive is applied to the corona treatment surface, the solvent is removed, and the embossed sheet is dried.

  This is bonded to a base sheet made of an olefin resin printed with a pattern by a hot-press roll. Thus, there is a manufacturing method for obtaining an embossed decorative sheet (Patent Document 1).

  Known documents are shown below.

Japanese Patent Laid-Open No. 7-80636

  The present invention has been made in view of the above-mentioned circumstances, has good bag-making processability, good opening when filling the contents, self-supporting, and good self-supporting ability when refilling. It is an object of the present invention to provide a packaging bag and a manufacturing method thereof.

The invention according to claim 1 of the present invention is a self-supporting packaging bag in which the front film and the back film are made of a packaging material in which a base material layer and a sealant layer are laminated, and a spout is provided in one corner of the upper end. In the self-supporting packaging bag, a belt-like pattern in which concave portions and convex portions are alternately arranged on the seal surface side of the sealant layer is provided in an oblique direction so that one corner side of the upper end is on the upper side.

  The invention according to claim 2 of the present invention is the self-supporting packaging according to claim 1, wherein the additive added to the sealant layer imparts slipperiness is 60 ppm or more and less than 100 ppm. It is a bag.

  The invention according to claim 3 of the present invention is the method for manufacturing the self-supporting packaging bag according to claim 1 or 2, wherein the molten resin to be the sealant layer is extruded from a T-shaped die, and the left and right sides are sandwiched between the center in the longitudinal direction. The self-supporting packaging bag according to claim 1 or 2, wherein the self-supporting packaging bag is laminated with the base material layer by cooling with a cooling roll provided with a belt-like pattern composed of concave and convex portions in an oblique direction. It is a manufacturing method.

  Since the self-supporting packaging bag of the present invention is provided with a strip-like pattern in which concave portions and convex portions are alternately arranged on the seal surface side of the sealant layer, the slipperiness is good and the bag-making processability is good. Opening is good when filling and it is self-supporting. Moreover, since the strip pattern is provided in an oblique direction so that one corner side of the upper end is on the top, the pouring property when refilling is good.

  In addition, the strip pattern with alternating recesses and protrusions improves the slipperiness, so even if the amount of additive that provides slipperiness is reduced, blocking does not occur, but slipperiness and openness Is good.

  Moreover, according to the manufacturing method of the self-supporting packaging bag of claim 3 of the present invention, it is possible to easily provide a belt-like pattern in which concave portions and convex portions are alternately arranged on the seal surface side of the sealant layer. A cooling roll with a strip-like pattern consisting of concave and convex parts symmetrically across the center in the direction works like a wrinkle-stretching roll (expander roll), and it does not cause wrinkles on the film that is formed, and it is bonded by wrinkles No defects will occur.

It is explanatory drawing which showed typically an example of the self-supporting packaging bag of this invention by the front. It is explanatory drawing which showed typically the packaging material of an example of the self-supporting packaging bag of this invention in the cross section. It is explanatory drawing which showed typically the strip | belt-shaped pattern of the surface of the cooling roll used for manufacture of an example of the self-supporting packaging bag of this invention. It is explanatory drawing which showed typically the lamination process of the packaging material which bonds the base material layer and sealant layer of an example of the self-supporting packaging bag of this invention. It is the one surface allocation figure of the front film and back film of an example of the self-supporting packaging bag of this invention. It is explanatory drawing which showed typically the strip | belt-shaped pattern of the cooling roll surface used for manufacture of the self-supporting packaging bag of the comparative example 4. It is explanatory drawing which showed typically the strip | belt-shaped pattern of the cooling roll surface used for manufacture of the self-supporting packaging bag of the comparative example 5. FIG.

Hereinafter, embodiments for carrying out the present invention will be described.
FIG. 1 is an explanatory view schematically showing an example of the self-supporting packaging bag of the present invention on the front side.

As shown in FIG. 1, the self-supporting packaging bag 100 of this example is a self-supporting packaging bag in which a spout 1 is provided at one corner of the upper end, a bottom tape 2 is sandwiched at the bottom, and a boat-shaped seal portion 3 is provided. . And the strip | belt-shaped pattern in which the recessed part 4 and the convex part 5 were located in a line on the sealing surface side of the sealant layer of the surface film 101 and the back film 102 is provided in the diagonal direction so that the one corner side of the said upper end may turn up. .

  Since it is in this way, the opening property when filling the contents is good, and the self-supporting property is good even if the sealant layer has the same thickness. Moreover, since the strip pattern is provided in an oblique direction so that one corner side of the upper end is on the top, the pouring property when refilling is good.

  FIG. 2 is an explanatory view schematically showing in cross section a packaging material as an example of the self-supporting packaging bag of the present invention.

  The packaging material 200 of the self-supporting packaging bag 100 of this example is formed by laminating a base material layer 6 and a sealant layer 7 as shown in the cross-sectional view of FIG. 2, and the base material layer 6 is composed of an adhesive layer (not shown). 2), the front base material layer 61 and the intermediate base material layer 62 are laminated. In this example, the base material layer 6 has a two-layer structure, but may be a single base material layer 6.

  And the recessed part 4 and the convex part 5 are provided in the seal surface side of the sealant layer 7. FIG. The unevenness of the recesses 4 and 5 is preferably 0.1 μm to 3.0 μm, more preferably 0.5 μm to 2.5 μm, in terms of surface roughness Ra [μm].

  The front substrate layer 61 is preferably a film having printability. Particularly preferably, a biaxially stretched polypropylene film, a biaxially stretched polyethylene terephthalate film, a biaxially stretched nylon film, or the like can be preferably used. The thickness is preferably about 6 to 25 μm.

  Printing is provided as necessary, and the method is not particularly limited, but is preferably performed by gravure printing or flexographic printing. If the front base material layer 61 is a transparent film, the back printing is performed on the front base material layer 61.

  The intermediate base material layer 62 can be selected from the films exemplified for the front base material layer 61, but a film having a barrier property can also be used. As the film having a barrier property, since the content is often an aqueous liquid, a film having a water vapor barrier property is preferable.

  An inorganic oxide vapor deposition film such as a biaxially stretched polyethylene terephthalate film or a biaxially stretched nylon film on which an inorganic oxide such as silica or alumina is deposited can be used.

  In consideration of light shielding properties, an aluminum foil or a biaxially stretched polyethylene terephthalate film on which aluminum is deposited is useful. The thickness is preferably about 6 to 25 μm.

The sealant layer 7 is not particularly limited as long as it can be formed by extrusion, but polyolefin is preferable, and linear low density polyethylene is particularly preferable. The melt flow rate is preferably 2 to 20 g / 9 minutes, the density is about 0.777 to 0.850 g / cm ³ , and linear low density polyethylene synthesized by a metallocene catalyst is preferable. In addition, in order to improve opening property, it is desirable to contain the additive which provides slipperiness.

Although not shown in FIG. 2, an adhesive layer can be provided between the layers for bonding. As the adhesive, a two-component curable urethane adhesive can be used. The coating amount is desirably about ^{2 to 5} g / m ² (dry coating amount).

Hereinafter, the manufacturing method of the self-supporting packaging bag of this invention is demonstrated.
FIG. 3 is an explanatory view schematically showing a belt-like pattern on the surface of a cooling roll used for manufacturing an example of the self-supporting packaging bag of the present invention, and FIG. 4 shows a base material layer of an example of the self-supporting packaging bag of the present invention. FIG. 5 is an explanatory view schematically showing a laminating process for bonding a sealant layer, and FIG. 5 is a one-sided layout diagram of a front film and a back film of an example of the self-supporting packaging bag of the present invention.

  When the base material layer 6 having a two-layer structure is used, the front base material layer 61 and the intermediate base material layer 62 are bonded together in advance via a two-component curable urethane adhesive.

  As shown in FIG. 3 (the vertical direction in the drawing is the circumferential direction of the roll and the horizontal direction is the longitudinal direction), the cooling roll 8 is previously formed in a belt-like shape having a concave portion 9 and a convex portion 10 symmetrically across the center in the longitudinal direction. A pattern is provided. The irregularities are transferred to the seal surface side of the sealant layer 7, and the irregularities are reversed in the sealant layer 7.

  This cooling roll 8 is attached to the line of the lamination process of FIG. This line system is called the Neelam system. The film of the base material layer 6 is unwound from the paper supply unit 11, the adhesive is applied to the back surface by the adhesive application unit 12, and the solvent of the adhesive is dried by the drying unit 13.

  On the other hand, the film of the sealant layer is passed through the T-type die 15 from the extruder 14, and the molten resin for the sealant layer is formed and extruded, and is cooled by the cooling roll 8 provided with the belt-like pattern to form a film. If necessary, this film is subjected to corona treatment on the surface to be bonded by the corona treatment machine 16.

  Then, with the two pressure rolls 17 and 17, the film of the base material layer 6 on which the adhesive is applied and dried and the film of the sealant layer are pressure-bonded and laminated, as a packaging material 200 for a self-supporting packaging bag, Winding is performed by the winding unit 18.

  The packaging material 200 for the front film and the back film is wound by slitting both sides for bag making, and placed on a bag making machine for a self-supporting packaging bag. Moreover, the bottom tape 2 prepared separately can also be put on a bag making machine.

  The layer structure of the bottom tape is also composed of a base material layer and a sealant layer, and has almost the same layer structure as the packaging material 200, but the thickness of the sealant layer does not need to be as thick as the front film and the back film. Further, it is not necessary to provide a concave portion and a convex portion on the surface of the sealant layer, and the lamination method is not particularly limited.

  The packaging material 200 unrolled on the bag making machine has a front film on the right and a back film on the left as shown in the one-side layout diagram 300 in FIG. 5, and is slit at the center between the front film and the back film. The sealant layers are stacked so that the sealant layers face each other.

  When superposed, the bottom tape, which is folded in two and has punch punch holes at the intersection of the boat-shaped seal portion 3 and the side seal portion, is inserted between the front film and the back film.

  Then, the bottom-shaped boat-shaped seal portion 3, the side seal portion, and the spout 1 are subjected to irregular-shaped sealing, and are separated into bags by slitting, cutting, or punching, and the bags are made. In addition, it was set as the filling port which is left unsealed except the irregular-shaped seal part of the part of the pouring spout 1 of the upper side of a bag, and is filled with the contents.

Since the packaging material 200 is slit in the center between the front film and the back film and overlapped so that the sealant layers face each other, the strip-shaped pattern facing the same direction on the surface of the sealant layer of the front film and the back film overlapped. Is provided.

  Therefore, it is necessary to provide the cooling roll 8 with a belt-like pattern composed of the concave portions 9 and the convex portions 10 in a diagonal direction with the longitudinal center in between. The angle in the oblique direction of the strip pattern is preferably 30 ° to 60 °.

  In addition, since the sealant layer is provided by the knee ram method, the sealant layer is sufficiently cooled by the cooling roll, the transparency and physical properties are improved from the extrusion lamination method, and corona treatment can be performed as necessary. Therefore, the adhesiveness with the base material layer can also be improved.

  Specific examples of the present invention will be described below.

<Example 1>
Biaxially stretched nylon film 15 μm (Mitsubishi resin; Santonyl (registered trademark) SNR-X) for the front substrate layer 61 and aluminum-deposited polyethylene terephthalate film 12 μm (Oike pack material; Tetraite (registered trademark) EXE) for the intermediate substrate layer 62 ) Was laminated by a dry laminating method using a two-component curable urethane adhesive (DIC graphic; LX500) (dry coating amount: 5 g / m ² ) to form a base material layer 6.

  As the resin for the sealant layer 7, erucic acid amide, an additive that imparts slipperiness to linear low density polyethylene (Ube Maruzen polyethylene; Umerit (registered trademark) 2040F) synthesized with a metallocene catalyst, is added to 70 ppm. The added resin was used.

In the line of the laminating process shown in FIG. 4, as described above, an adhesive (DIC graphic; LX500 dry coating amount 2.5 g / m ² ) is applied to the base layer 6, dried, and dried for the sealant layer 7. The resin is extruded from the extruder 14 through the T-shaped die 15, and as shown in FIG. 3, a belt-like pattern in which concave portions and convex portions are alternately arranged symmetrically with the center in the longitudinal direction sandwiched in a 45 ° oblique direction. The film is cooled by a cooling roll 8 provided to be a film having a thickness of 110 μm, the surface to be bonded is subjected to corona treatment, and bonded to the base material layer 6 coated and dried with an adhesive. The packaging material 200 for the front film back film in which was formed was created.

  As the bottom tape 2, a laminated tape having the same material as the packaging material 200 and having a sealant layer thickness of 70 μm and not having recesses and projections is prepared, and together with the packaging material 200 slit for bag making, the self-supporting packaging bag The bag was made on a bag making machine and made as described above to prepare a self-supporting packaging bag having a top-and-bottom direction of 220 mm, a left-right direction of 120 mm, and a seal width of 6 mm, and the self-supporting packaging bag of Example 1 was obtained.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
A self-supporting packaging bag of Comparative Example 1 was obtained in the same manner as in Example 1 except that the resin for the sealant layer 7 was a resin that did not contain erucic acid amide, an additive that imparts slipperiness.

<Comparative example 2>
A self-supporting packaging bag of Comparative Example 2 was obtained in the same manner as in Example 1 except that a semi-matt roll having a surface and fine irregularities provided on the entire surface was used as the cooling roll 8.

<Comparative Example 3>
A 110 μm linear low density polyethylene film (Tamapoly; MZ433) (addition amount of erucic acid amide of 350 to 400 ppm as an additive that imparts slipperiness) is prepared as a sealant layer 7, and an adhesive (DIC A self-supporting packaging bag of Comparative Example 3 in the same manner as in Example 1 except that the packaging material for the front film and the back film was prepared by laminating using a graphic; LX500 dry coating amount 2.5 g / m ² ). Got.

<Comparative example 4>
The self-supporting of Comparative Example 4 was performed in the same manner as in Example 1 except that a cooling roll having a strip-like pattern in which concave portions and convex portions were alternately arranged as shown in FIG. 6 was used in the longitudinal direction of the roll. A sex packaging bag was obtained.

<Comparative Example 5>
As a cooling roll, the self-supporting of Comparative Example 5 was performed in the same manner as in Example 1 except that a cooling roll in which strip-like patterns in which concave portions and convex portions were alternately arranged as shown in FIG. 7 was used in the circumferential direction of the roll. A sex packaging bag was obtained.

<Test method>
The self-supporting packaging bags of the example and the comparative example were tested by the following method and compared and evaluated.

<Dynamic friction coefficient>
As an evaluation of slipperiness, a dynamic friction coefficient (based on JIS K7125) was measured. The measurement was performed with the sealant layers of the packaging material facing each other. The results are summarized in Table 1.

<Bag-making processability>
The bag-making processability on the bag-making machine was evaluated by pitch deviation, meandering, and the like. If there was a bag-making processability equivalent to that of Comparative Example 3 using a conventional packaging material, it was rated as ◯, and an inferior one as x. The results are summarized in Table 1.

<Openness>
The self-supporting packaging bags of Examples and Comparative Examples were filled with 400 cc of water as the contents from the unsealed filling port on the upper side, and the ease of filling water at that time was subjected to sensory evaluation. The openability of the self-supporting packaging bag of Comparative Example 3 was evaluated as 3 points, the clearly inferior one as 1 point, the clearly superior as 5 points, and the middle of each as 2 points and 4 points. The results are summarized in Table 1.

<Independence>
Each of the self-supporting packaging bags of Examples and Comparative Examples filled with 400 cc of water was allowed to stand with the bottom part down, and visually confirmed after one day to evaluate self-supporting. The independence of the self-supporting packaging bag of Comparative Example 3 was evaluated as 3 points, the clearly inferior one as 1 point, the clearly superior as 5 points, and the middle of each as 2 points and 4 points. The results are summarized in Table 1.

<Pourability>
Cut the spout of the self-supporting packaging bag of Example and Comparative Example filled with 400 cc of water with scissors, open the spout against the opening of a container that is used repeatedly, transfer the water of the contents, and transfer The time required was measured. The results are summarized in Table 1.

以下に、実施例と比較例との比較結果について説明する。

Below, the comparison result of an Example and a comparative example is demonstrated.

<Comparison result>
The self-supporting packaging bag of Example 1 had a low coefficient of dynamic friction, good bag-making processability, openability and self-supporting property, and good pouring properties of 25 seconds.

  The self-supporting packaging bag of Comparative Example 1 had a large coefficient of dynamic friction of 0.45, poor bag-making processability, and two points of openability, which were not very good. The self-supporting packaging bag of Comparative Example 2 was not very good in opening property and self-supporting property, and the pouring property was as bad as 43 seconds.

  The self-supporting packaging bag of Comparative Example 3 had good bag-making processability, and there was no problem with the opening property and the self-supporting property, but the pouring property took 31 seconds and was not so good.

  In the self-supporting packaging bag of Comparative Example 4, the self-supporting property was improved, but the pouring property was not improved. Moreover, the self-supporting packaging bag of Comparative Example 5 had poor openability, no improvement in self-supporting property, and poor pouring properties.

DESCRIPTION OF SYMBOLS 100 ... Self-supporting packaging bag 101 ... Front film 102 ... Back film 200 ... Packaging material 300 ... One side allocation FIG. 1 ... Spout 2 ... Bottom tape 3 ... Boat shape Seal part 4 ... concave part 5 ... convex part 6 ... base material layer 61 ... front base material layer 62 ... intermediate base material layer 7 ... sealant layer 8 ... cooling roll 9 .... Concave part 10 ... Convex part 11 ... Paper feed part 12 ... Adhesive application part 13 ... Drying part 14 ... Extruder 15 ... T-shaped die 16 ... Corona treatment machine 17, 17 ... crimping roll 18 ... winding part

Claims (3)

  The front film and the back film are made of a packaging material in which a base material layer and a sealant layer are laminated, and are self-supporting packaging bags provided with a spout at one corner of the upper end. A self-supporting packaging bag, characterized in that strip-like patterns alternately arranged with portions are provided in an oblique direction so that one corner side of the upper end is on the upper side.   The self-supporting packaging bag according to claim 1, wherein the additive added to the sealant layer imparts slipperiness is 60 ppm or more and less than 100 ppm.   It is a manufacturing method of the self-supporting packaging bag of Claim 1 or 2, Comprising: The molten resin used as the said sealant layer is extruded from a T-type die, and a concave part and a convex part are diagonally inclined with the center in the longitudinal direction sandwiched therebetween. It cools with the cooling roll which provided the strip | belt-shaped pattern which consists of, and laminates | stacks with the said base material layer, The manufacturing method of the self-supporting packaging bag of Claim 1 or 2 characterized by the above-mentioned.

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