JP4614308B2 - Packaging material and manufacturing method thereof - Google Patents

Description

  The present invention relates to a packaging material using a synthetic resin film stretched in a biaxial direction as a base material layer, and to a packaging material that can be surely torn and opened along a straight opening schedule line that is assumed in advance. It is.

  Conventionally, it is solid and granular in packaging bags of three-side seal type, four-side seal type, pillow type, gusset type, standing type, etc. using a packaging material whose base layer is a synthetic resin film stretched biaxially. Various foods such as powders and liquids are stored on the market. And the above-mentioned packaging bag employs various easy-opening means so that the contents can be easily taken out. For example, a notch or notch provided at the end of the packaging bag, or a cut line with a straight line or perforation at the position that is the planned opening line when the packaging bag of the base material layer of the packaging material is used in advance. In the case of a packaging bag, it can be opened along the planned opening line.

  However, packaging bags with notches and scratches are easy to start opening, but due to the tear resistance of the base material layer, the tear resistance is high until the opening is completed, and it is difficult to tear. There is a problem that the opening of the opening is unsatisfactory. In addition, a packaging bag made of a packaging material provided with a scheduled opening line consisting of straight cuts in the base material layer can be easily torn and cut along the tear opening line so that the opening is also beautiful. (For example, refer to Patent Document 1). However, since the invention described in Patent Document 1 can only provide a scheduled opening line composed of straight cuts in the longitudinal direction of the packaging material, the opening schedule line is in a direction orthogonal to the longitudinal direction of the packaging material. There is a problem that it cannot be applied to a packaging bag having a configuration to be provided (if a planned opening line is provided in a direction orthogonal to the longitudinal direction of the packaging material, there is a risk of cutting when the packaging material is manufactured).

  Therefore, as an easy-opening means that can correspond to a packaging bag having a configuration in which the planned opening line is provided in a direction orthogonal to the longitudinal direction of the packaging material, the planned opening line made of straight perforated cuts in the base material layer A packaging bag made of a packaging material provided in a direction orthogonal to the longitudinal direction of the base material layer can be considered, but when this packaging bag is torn open from a perforated cut, it is between the cut and the cut (joint part) There is a problem that it is not possible to open along the perforated cut line without bridging the tear line. As an easy-opening means for solving this problem, various deformed perforated cut lines have been proposed (for example, see Patent Document 2). The invention described in Patent Document 2 can be surely opened along the planned opening line, but there is a problem of directivity that it cannot be opened along the planned opening line unless it is from one direction. .

By the way, in the process of providing a planned opening line composed of perforated cuts in a direction perpendicular to the longitudinal direction of the packaging material, the tip of the cutting blade provided on the die cut roll is usually brought into contact with the peripheral surface of the anvil roll. Although it is carried out by a rotary die cutter, there is a problem that the deformation perforation has a higher degree of processing of the cutting blade provided on the die cut roll and the cost of the die cut roll is higher than that of the straight perforation. Therefore, the present inventors have conducted an extensive study on a straight perforated cut with a low cutting cost of the die-cut roll and a good bridging of the tear line between the cuts (joint portion). The invention has been completed.
JP-A-7-285559 Utility Model Registration No. 2566444

  The present invention can be easily torn from any direction along the planned opening line, and moreover, the tear line can be more reliably bridged between the incisions (joint portions). It is to provide a packaging material having a beautiful opening line and a manufacturing method thereof.

In order to achieve the above object, the inventor of the present invention described in claim 1 includes at least a base material layer made of a synthetic resin film stretched in a biaxial direction and an inner layer made of a thermoadhesive resin layer. A laminated long packaging material, wherein the base material layer is formed with a predetermined opening line in which straight cuts of a predetermined length for tearing and opening are arranged in a straight line at regular intervals, and The straight cut is in the opposite direction to the straight cut from each of both ends in the longitudinal direction, and on the direction side perpendicular to the longitudinal direction of the straight cut and is a virtual extension line of the straight cut. On the other hand, it has a crevice protruding substantially line symmetrically .

  Moreover, the present invention according to claim 2 is characterized in that, in the packaging material according to claim 1, the planned opening line is formed in a direction orthogonal to the longitudinal direction.

  Further, the present invention according to claim 3 is the packaging material according to any one of claims 1 and 2, wherein the surface side of the base material layer and / or between the base material layer and the inner layer is easy. A tear material layer is provided.

  Moreover, this invention of Claim 4 is a packaging material in any one of Claims 1-3, The said linear cut is 0.3-5.0 mm length, Comprising: Between the said linear cuts, The interval is 0.3 to 0.5 mm in length.

  By having the structure in any one of Claims 1-4, it has a tear which protrudes in the direction side orthogonal to a longitudinal direction in the longitudinal direction both ends of the linear cut of fixed length, and a tear line is Since it is more reliably bridged between the straight cuts (joining portions) and can be more reliably torn along a straight line to be opened, a beautiful tear opening line can be obtained.

  Moreover, this invention of Claim 5 is a packaging material in any one of Claims 1-4. WHEREIN: The said opening expected line is displayed by printing. By comprising in this way, a tearing position can be confirmed easily visually.

According to a sixth aspect of the present invention, there is provided a method for producing a packaging material according to the present invention, wherein a planned opening line straight in one direction is formed on one surface of a base material layer made of a synthetic resin film stretched biaxially by printing. The substrate layer is aligned with the planned opening line by a rotary die cutter comprising a step and a die-cut roll having a cutting edge on the peripheral surface and an anvil roll having a cushion layer on the peripheral surface. Straight cuts of a certain length are provided at regular intervals so that the tip of the cutting edge is located in the cushion layer from the other surface side, and from both ends of the straight cut to the straight cut. Forming a slit in an opposite direction and in a direction orthogonal to the longitudinal direction of the linear cut and projecting substantially linearly with respect to the virtual extension of the linear cut; and Through the adhesive layer on the printing surface of And it is characterized in that comprising the step of laminating an inner layer made of a heat-adhesive resin. By adopting such a manufacturing method, it is possible to surely form a fissure that protrudes in the direction perpendicular to the longitudinal direction at both longitudinal ends of the linear cut.

  The packaging bag of the present invention configured as described above can easily start opening (start tearing) from any direction along the planned opening line, and tear line between the cuts (joint part) Therefore, it is possible to perform tearing smoothly along the planned opening line, and to obtain an opening having a beautiful tear opening line.

The above-described present invention will be described in detail below with reference to the drawings.
FIG. 1 is a plan view of an essential part of the packaging material according to the present invention as seen from the base material layer side, FIG. 2 is a diagram schematically showing a cross section taken along line XX of FIG. 1, and FIG. FIG. 4 schematically illustrates a straight line cut provided in the packaging material according to the present invention, and FIG. 5 schematically illustrates a conventional straight line cut. In the figure, 1 is a packaging material, 2 is a base material layer, 3 is an inner layer, 4 and 4 'are linear cuts, 10 is a pillow-type packaging bag, 11 is a back thermal bonding portion, 12 is an upper and lower end Partially heat-bonded portion, 41 is a fissure, and R is a photoelectric tube mark.

  1 is a schematic plan view of the packaging material according to the present invention as viewed from the base material layer side, FIG. 2 is a diagram schematically showing a cross section taken along line XX of FIG. 1, and FIG. 3 is a diagram using the packaging material of FIG. A produced pillow type packaging bag, in which a packaging material 1 is formed by laminating an inner layer 3 made of a heat-adhesive resin on one surface of a base material layer 2 made of a synthetic resin film stretched biaxially. It is a long sheet | seat continuous in the up-down direction on FIG. The rectangular black marks (two on the top in FIG. 1) shown on the right end of FIG. 1 are phototube marks R, and the back heat-bonding portion 11 and the top heat-bonding portion 11 that are heat-bonded in a palm shape using the packaging material 1. When the pillow type packaging bag 10 as shown in FIG. 3 consisting of the lower end thermal bonding portion 12 is produced, the space between the photoelectric tube marks R is a unit of one packaging bag. In the packaging material 1, linear cuts 4 having a predetermined length are formed in the base material layer 2 at regular intervals so as to cross the packaging material 1 at a predetermined position for each unit to be a packaging bag. Yes.

  Next, the linear cut provided in the packaging material 1 of this invention is demonstrated. First, a conventional straight cut provided in a straight line will be described. FIG. 5 is an enlarged view for explaining a conventional straight straight cut, and the conventional straight cut 4 ′ is usually arranged on the peripheral surface of the die-cut roll, for example, as described in the background section. It is provided with a rotary die cutter in which the tips of linear cutting blades (both blades) provided in a straight line at regular intervals are brought into contact with the peripheral surface of the anvil roll. In this case, the linear cut 4 'is constant. It is formed according to a substantially straight cutting edge shape at an interval S. For this purpose, for example, when the leftmost straight cut 4 ′ in FIG. 5 is opened to the right (on FIG. 5) as the opening start end, the right end T of the straight cut 4 ′ (in FIG. If the tear line is directed in the direction of the next straight cut 4 'adjacent to the other, the bridge becomes a good bridge and can be torn in a straight line, but the next straight cut 4' adjacent to the tear line If it deviates from this direction, it cannot be torn in a straight line, and an opening having a beautiful tear opening line cannot be obtained. This is thought to be because the directionality of stretching of the base material layer 2 made of a synthetic resin film stretched in the biaxial direction rather than the force acting in the tearing direction is prevailing, and in the tearing direction when tearing in the tearing direction. If the direction of stretching of the base material layer 2 is eliminated so that only the working force can contribute, it is possible to more reliably bridge the tear line from the straight cut line 4 'to the next straight cut line 4'. I found that I can do it.

  FIG. 4 is a diagram schematically illustrating a straight straight cut provided in the packaging material according to the present invention. The straight cut 4 has both ends T in the longitudinal direction (in FIG. 4, only one symbol is shown). ) Have crevices 41 (two on the end portion in FIG. 4) protruding in the direction perpendicular to the longitudinal direction. When the straight cut 4 configured in this way is torn to the right side (on FIG. 4) with the leftmost straight cut 4 in FIG. 4 as the opening start end, the right end T (see FIG. 4) of the straight cut 4 4, the sign 41 is formed in advance at one location), so that the tear 41 cancels the direction of stretching of the base material layer 2, and the tear 41 serves as a bridge for the tear line. Since the tearing continues continuously from one straight cut 4 to the next straight cut 4, an opening having a beautiful tear opening line is obtained. be able to.

  As a method of forming the straight cut 4, although not shown, a cushion layer is provided on the peripheral surface of the anvil roll, and a linear cutting blade (both blades) protruding from the peripheral surface of the die cut roll is 0.1 in the cushion layer. By forming it so as to bite by a depth of ˜0.4 mm, it is possible to form a cut having a slit 41 projecting in the direction orthogonal to the longitudinal direction at both ends in the longitudinal direction. The cushion layer is not particularly limited as long as it is a material having elasticity. For example, various synthetic rubbers are suitable. In FIG. 4, the two slits 41 are illustrated at both ends of the linear cut 4, but if one is provided at both ends, the linear slit 4 is linearly formed. It can serve as a bridge to the cut line.

  Further, the length of the linear cut 4 is 0.3 mm or more in consideration of ease of processing, and is 5.0 mm or less in consideration of cutting of the base material layer 2 during processing. In addition, the interval between the cuts is 0.3 mm or more in consideration of ease of processing, and 0.5 mm or less in consideration of a good bridging of the tear line from the cut to the cut. The length of the fissure 41 is approximately several μm to several tens of μm.

  The pillow type packaging bag 10 produced with the packaging material 1 configured as described above can be opened from either the left or right direction in FIG. Further, the pillow type packaging bag 10 has been described as an example, but the packaging material 1 of the present invention is applied to a packaging bag such as a three-way type, a four-way type packaging bag, a standing pouch, or a gusset type. However, it is suitable for a packaging bag in which the packaging material 1 is made in the longitudinal direction and opened in a direction orthogonal to the longitudinal direction like a pillow type packaging bag. Moreover, although description is abbreviate | omitted for the packaging material 1 of this invention, it can be used also as a sheet-like cover body of a cup-shaped container.

  Further, up to now, the packaging material composed of the base material layer 2 and the inner layer 3 has been described as an example, but the surface side of the base material layer 2 and / or the base material layer 2 and the base material layer 2 have been described. An easily tearable material layer such as cellophane, paper, aluminum foil or the like may be provided between the inner layer 3 and the inner layer 3. Moreover, as the synthetic resin film stretched in the biaxial direction used for the base material layer 2, a well-known film made of a resin such as polypropylene, polyamide, or polyester can be used, and the thermoadhesive resin used for the inner layer 3. As low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer Well-known thermoadhesive resins such as ionomer resins, acid copolymers of ethylene and acrylic acid, ester copolymers of ethylene and acrylic acid esters can be used. Material layer / printing layer / inner layer, 2) substrate layer / printing layer / aluminum foil layer / inner layer, 3) printing layer / Layer / substrate layer / inner layer, 4) printing layer / paper layer / aluminum foil layer substrate layer / substrate layer / inner layer, or the like. As a method for laminating each layer, a known laminating method such as a sandwich lamination method or a dry lamination method may be used.

It is the principal part top view seen from the base-material layer side of the packaging material concerning this invention. It is a figure which shows the XX sectional view of FIG. It is a pillow type packaging bag produced using the packaging material of FIG. It is a figure which illustrates the straight linear cut line provided in the packaging material concerning this invention illustratively. It is a figure which illustrates the conventional straight linear cut line graphically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packaging material 2 Base material layer 3 Inner layer 4,4 'Straight cut line 10 Pillow type packaging bag 11 Back part heat bonding part 12 Upper and lower end part heat bonding part 41 Crevice R Photoelectric tube mark

Claims (6)

A long packaging material in which a base material layer made of a synthetic resin film stretched in a biaxial direction and an inner layer made of a thermoadhesive resin layer are laminated, and the base material layer is torn and opened. A predetermined opening line is formed in which straight cuts of a certain length are arranged in a straight line at regular intervals, and the straight cuts are opposite to the straight cuts from both ends in the longitudinal direction. And a wrapping material that has a slit projecting substantially linearly with respect to a virtual extension line of the linear cut, which is on the direction side perpendicular to the longitudinal direction of the linear cut. . The packaging material according to claim 1, wherein the planned opening line is formed in a direction orthogonal to the longitudinal direction. The packaging material according to claim 1, wherein an easily tearable material layer is provided between the surface side of the base material layer and / or between the base material layer and the inner layer. The said linear cut is 0.3-5.0 mm length, The space | interval between the said linear cuts is 0.3-0.5 mm length, The any one of Claims 1-3 characterized by the above-mentioned. Packaging material as described in 1. The packaging material according to any one of claims 1 to 4, wherein the planned opening line is displayed by printing. A step of forming a straight opening planned line in one direction on one surface of a base material layer made of a synthetic resin film stretched in a biaxial direction by printing, and a die cut provided with a cutting edge on the peripheral surface of the base material layer A tip of the cutting blade is positioned in the cushion layer from the other surface side of the base material layer in register with the opening expected line with a rotary die cutter comprising a roll and an anvil roll provided with a cushion layer on the peripheral surface. The linear cuts of a certain length are provided at regular intervals so as to be opposite to the linear cuts from both ends of the linear cuts and in a direction perpendicular to the longitudinal direction of the linear cuts. Forming a slit that protrudes substantially symmetrically with respect to the virtual extension line of the straight cut, and an inner layer made of a heat-adhesive resin on the printed surface of the base material layer via an adhesive layer The process of laminating Method for producing a packaging material, characterized in that.

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