JP2019177927A - bag - Google Patents

Abstract

To provide a bag that is easily broken by an easily breakable part.SOLUTION: A bag includes a first end part, a second end part, a butted part where a packaging material is stacked on a front side, a seal part that joins an inner surfaces of the packaging material at the first end part, the second end part and the butted part and an easily breakable part that spreads so as to bridge the base of the butted part. A tensile strength of a first base material layer in a second direction is 2.5 times or more the tensile strength of the first base material layer in a first direction. An opening start part including at least a plurality of notches or a plurality of cuts extending in the second direction from a distal end part of the butted part is provided in the butted part. The easily breakable part has a plurality of partial through parts that penetrate at least the first base material layer and do not penetrate a sealant layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bag provided with an accommodating portion for accommodating contents.

  As a bag for containing the contents, a bag made of a film-like packaging material containing a plastic material such as PET or nylon is used. Such a bag is configured, for example, as described in Patent Document 1, by thermally welding the inner surfaces of the packaging material to form a seal portion. In this case, the accommodating part for accommodating the contents is defined as a space surrounded by the packaging material and the seal part.

  A bag made of a packaging material is usually provided with an opening means for easily breaking the bag and opening the bag. For example, Patent Document 1 proposes to provide an opening means that can be torn in a direction perpendicular to the running direction of the back seal portion in the back seal portion of the bag.

JP-A-10-35694

  When the user breaks the bag along the opening means, an opening is formed in the bag. If the bag can be ruptured linearly from one side end to the other side end, the size of the opening increases and the contents contained in the bag can be easily taken out.

  An object of this invention is to provide the bag provided with the opening means which can solve such a subject effectively.

  The present invention is a bag formed of a packaging material including a first base material layer and a sealant layer, and having a front surface and a back surface, the first end portion and the second end facing the first end portion in the first direction. An end portion, a palm portion extending in the first direction from the first end portion to the second end portion, and the packaging material being overlapped on the surface side, the first end portion, and the second end portion A sealing portion that joins the inner surfaces of the packaging material in the portion and the palm portion, and an easily breakable portion that is provided on the surface and the palm portion and extends across the base portion of the palm portion, the first direction The tensile strength of the first base material layer in the second direction orthogonal to the first direction is 2.5 times or more of the tensile strength of the first base material layer in the first direction. In the position overlapping with the easily breakable portion when viewed along the direction, the palm portion An opening start portion including at least a plurality of cutouts or a plurality of cuts extending along the second direction from the distal end portion is provided, and the easily breakable portion penetrates at least the first base material layer and the sealant layer. It is a bag which has a some partial penetration part which does not penetrate.

  In the bag according to the present invention, the packaging material is located on the outer surface side of the bag with respect to the first base material layer, further includes a second base material layer containing paper, and the partial penetration portion of the easily breakable portion is In addition, it may be configured to penetrate at least the first base material layer and the second base material layer and not penetrate the sealant layer.

  In the bag according to the present invention, the packaging material further includes a first adhesive layer positioned between the first base material layer and the sealant layer, and the second base material layer is formed on a wall surface of the partial through-hole. The first base material layer may be positioned closer to the center of the partial through-hole than the first base material layer.

  In the bag according to the present invention, the packaging material may further include a second adhesive layer located between the first base material layer and the second base material layer.

  The bag by this invention WHEREIN: The cross-sectional area of the said partial penetration part may increase as it goes to the said 1st base material layer side from the said 2nd base material layer side.

  In the bag according to the present invention, the easily breakable portion may extend along the first direction from the first end portion to the second end portion.

  According to the present invention, the user can easily break the bag with the easily breakable portion. For this reason, the ease of taking out the contents can be improved.

It is a top view which shows the bag in embodiment of this invention. It is sectional drawing which looked at the bag of FIG. 1 from the II-II direction. It is sectional drawing which shows an example of the layer structure of the packaging material which comprises a bag. It is sectional drawing which shows an example of the layer structure of the packaging material which comprises a bag. It is sectional drawing which shows the state which bent the 2nd surface of the bag so that the 1st surface of a palm part and the 1st surface of a bag might become parallel. It is a figure which shows an example of an easily broken part, Comprising: It is the top view which looked at the easily broken part of FIG. 5 from VI direction. It is a top view which shows the other example of an easily breakable part. It is a top view which shows the other example of an easily breakable part. It is a top view which shows the other example of an easily breakable part. It is a top view which shows the other example of an easily breakable part. It is a top view which shows the other example of an easily breakable part. It is sectional drawing which looked at the easily fracture part of FIG. 6 from the VIII-VIII direction. It is sectional drawing which expands and shows the partial penetration part of an easily breakable part. It is sectional drawing which shows a mode that the bag shown in FIG. 1 is opened. It is sectional drawing which shows a mode that the bag shown in FIG. 1 is opened. It is a top view which shows the state by which the bag shown in FIG. 1 was opened. It is a top view which shows the 1st modification of a bag. It is a top view which shows the 2nd modification of a bag. It is sectional drawing which looked at the bag of FIG. 14 from the XV-XV direction.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Note that, in the drawings attached to the present specification, for convenience of illustration and understanding, the scale and vertical / horizontal dimension ratios are appropriately changed and exaggerated from those of the actual ones.

  In addition, as used in this specification, the shape and geometric conditions and the degree thereof are specified, for example, terms such as “parallel”, “orthogonal”, “identical”, length and angle values, etc. are strictly Without being bound by meaning, it should be interpreted including the extent to which similar functions can be expected.

Bag FIG. 1 is a plan view showing a bag 10 in which the contents 19 are stored. 2 is a cross-sectional view of the bag 10 of FIG. 1 as viewed from the II-II direction. The bag 10 is formed by partially joining the inner surfaces of the film-shaped packaging material 30. The bag 10 includes a front surface 11 and a back surface 12 constituted by the packaging material 30. Among these, the surface 11 includes a first surface 11 a provided with an easily breakable portion 20 described later, and a second surface 11 b separated from the first surface 11 a by a palm portion 17 described later. As shown in FIG. 2, both the front surface 11 and the back surface 12 are configured by folding a single packaging material 30. Although not shown, the number of packaging materials 30 constituting the bag 10 is not limited to one, and the bag 10 may be composed of a plurality of packaging materials 30.

  As shown in FIG. 1, the bag 10 includes a first end 13, a second end 14 that faces the first end 13 in the first direction D <b> 1, and from the first end 13 to the second end 14. A pair of side end portions 15a and 15b extending along the first direction D1. Of the pair of side end portions 15a and 15b, the side end portion 15a is provided on the first surface 11a side, and the side end portion 15b is provided on the second surface 11b side. The 1st direction D1 is a conveyance direction of the packaging material 30 at the time of producing the bag 10 from the film-like packaging material 30, and is what is called MD (Machine Direction). In the example shown in FIG. 1, the first end portion 13 and the second end portion 14 extend in a second direction D2 orthogonal to the first direction D1, and thus the bag 10 has a rectangular outer shape. . Although not shown, the first end 13 and the second end 14 may extend in a direction inclined with respect to the second direction D2.

  As shown in FIGS. 1 and 2, the bag 10 includes a palm portion 17 that extends along the first direction D <b> 1 from the first end portion 13 to the second end portion 14 and on which the packaging material 30 is stacked. Thus, the bag 10 is a so-called pillow bag. The palm portion 17 is located on the surface 11 side. In other words, in the present embodiment, the surface on which the palm portion 17 is located is referred to as the surface 11. The palm portion 17 includes a first surface 17a that faces the first surface 11a of the surface 11 of the bag 10, and a second surface 17b that is located on the opposite side of the first surface 17a. That is, as shown in FIG. 2, the palm portion 17 is provided such that the first surface 17 a of the palm portion 17 faces the first surface 11 a of the bag 10 with the base portion 173 of the palm portion 17 as a fold. The tip end portion 172 of the palm portion 17 faces the side end portion 15a of the pair of side end portions 15a and 15b. The “base” means a boundary portion between the first surface 17a of the palm portion 17 and the first surface 11a or the second surface 11b of the surface 11.

  The bag 10 includes a seal portion that joins the inner surfaces of the film-shaped packaging material 30 together. The seal portion includes a first end seal portion 131 located at the first end portion 13, a second end seal portion 141 located at the second end portion 14, and a palm portion seal portion 171 located at the palm portion 17. Including. In addition, as long as the inner surfaces of the packaging material 30 can be joined and the bag 10 can be sealed, the method for forming the seal portion is not particularly limited. For example, the seal portion may be formed by melting a part of the packaging material 30 by heating or the like and welding the inner surfaces of the packaging material 30 to each other. Or you may form a seal | sticker part by adhere | attaching the inner surfaces of the packaging material 30 using an adhesive agent.

  As shown in FIG. 1, the palm portion seal portion 171 extends in the first direction D1 so as to reach from the first end seal portion 131 to the second end seal portion 141. Further, as shown in FIG. 2, the palm portion seal portion 171 may extend to the tip portion 172 of the palm portion 17 in the second direction D2, or although not shown, the palm portion seal portion 171 It does not have to extend to the tip 172. Further, the palm portion seal portion 171 may extend to the base portion 173 of the palm portion 17 in the second direction D2, or although not shown, the palm portion seal portion 171 does not extend to the base portion 173. Also good.

  As shown in FIGS. 1 and 2, the bag 10 includes an easily breakable portion 20 that spreads across the base portion 173 of the palm portion 17. In the present embodiment, the easily breakable portion 20 extends along the first direction from the first end portion 13 to the second end portion 14. The easily breakable portion 20 is a portion configured to be easily broken compared to other portions of the front surface 11 and the back surface 12. The easily breakable portion 20 is formed on the first surface 11 a of the surface 11 and the first surface 17 a of the palm portion 17. By providing such an easily breakable portion 20 in the bag 10, when the user breaks the bag 10, breakage is likely to occur near the base portion 173 of the palm portion 17 on the first surface 11 a of the bag 10. The structure of the easily breakable part 20 will be described later.

  As illustrated in FIG. 1, the opening portion 172 of the palm portion 17 is provided with an opening start portion 23 that extends from the tip portion 172 of the palm portion 17 along the second direction D2. The opening start portion 23 is a portion that triggers the breakage when the bag 10 is broken along the easily breakable portion 20. The opening start portion 23 includes, for example, a plurality of notches formed at the distal end portion 172 of the palm portion 17. The notch is a V-shaped notch or a notch. In the example shown in the drawing, a pair of cuts 23 a is formed at the distal end portion 172 of the palm portion 17 and constitutes the opening start portion 23. The unsealing start portion 23 may extend from the distal end portion 172 of the palm portion 17 to the easily breakable portion 20. By providing such an opening start portion 23 in the bag 10, when the user breaks the bag 10, as will be described later, the bag 10 is broken by, for example, picking the knob 24 between the pair of cuts 23 a. Can be made easier. The distance between the pair of cuts 23a in the first direction D1, that is, the width of the knob 24 is, for example, 3 mm or more and 10 mm or less.

  As shown in FIG. 1, the opening start part 23 may be located at least partially outside the end part 191 of the contents 19 in the first direction D1. Moreover, the opening start part 23 may be located at least partially inside the end part 191 of the contents 19 in the first direction D1. In the example illustrated in FIG. 1, the opening start portion 23 extends so as to straddle the end portion 191 of the content 19 in the first direction D1 in plan view. The “outside” means a side away from the center of the bag 10 in a plan view, and the “inside” means a side approaching the center of the bag 10 in a plan view.

  In the following description, the direction from the second end portion 14 toward the first end portion 13 in the first direction D1 is referred to as the eleventh direction D11, and the first direction D1 from the first end portion 13 in the first direction D1. The direction toward the two end portions 14 is also referred to as a twelfth direction D12.

  The content 19 is, for example, a solid material. The content 19 may be a solid matter that a person takes such as a food or a medicine, or may be a solid matter such as a bathing agent that the person does not take a mouth. Specific examples of the contents 19 include plate-shaped chocolate, cookies, rice crackers, cheese, ham or sausage, stationery, toys, cards, and the like.

(Layer structure of packaging materials)
Next, the layer configuration of the packaging material 30 constituting the bag 10 will be described. FIG. 3 is a cross-sectional view illustrating an example of a layer configuration of the packaging material 30.

  The packaging material 30 includes at least a first base material layer 31 and a sealant layer 32. In the example shown in FIG. 3, the first base material layer 31 constitutes the outer surface 302 of the packaging material 30, and the sealant layer 32 constitutes the inner surface 301 of the packaging material 30. The packaging material 30 may further include a printed layer 33 provided on the first base material layer 31 on the inner surface 301 side, for example. The packaging material 30 may further include a first adhesive layer 34 that bonds the first base material layer 31 and the sealant layer 32 together. Furthermore, the packaging material 30 may further include a functional layer 37 provided on the sealant layer 32. As shown in FIG. 3, the thickness of the packaging material 30 in which the first base material layer 31 forms the outer surface 302 is, for example, 25 μm or more and 60 μm or less.

  FIG. 4 is a cross-sectional view illustrating another example of the layer configuration of the packaging material 30. The packaging material 30 may further include a second base material layer 35 located on the outer surface 302 side of the first base material layer 31. When the packaging material 30 includes the second base material layer 35, the print layer 33 may be provided on the outer surface 302 side of the second base material layer 35 as illustrated in FIG. 4. Further, the packaging material 30 may further include a second adhesive layer 36 that adheres the first base material layer 31 and the second base material layer 35. Furthermore, the packaging material 30 may further include a functional layer 37 provided on the sealant layer 32. The thickness of the packaging material 30 further including the second base material layer 35 in addition to the first base material layer 31 and the sealant layer 32 as shown in FIG. 4 is, for example, not less than 35 μm and not more than 100 μm.

  Hereinafter, each layer of the packaging material 30 will be described.

  As a material which comprises the 1st base material layer 31, plastics, such as polyester, such as polyolefin, such as a polypropylene and a high density polyethylene, polyethylene terephthalate and a polybutylene terephthalate, and polyamides, such as nylon, can be used, for example.

  The plastic film constituting the first base material layer 31 may be stretched uniaxially or biaxially. In this case, the first base material layer 31 is preferably stretched so that the tensile strength in the second direction D2 is greater than the tensile strength in the first direction D1. Thereby, the 1st base material layer 31 becomes easy to be torn along the 2nd direction D2. In the following description, the characteristic that the tensile strength in the second direction D2 is larger than the tensile strength in the first direction D1 among the characteristics of the plastic film such as the first base material layer 31 is also referred to as “lateral tearing”. Of the characteristics of the plastic film, the characteristic that the breaking strength in the second direction D2 is smaller than the breaking strength in the first direction D1 is also referred to as “lateral tearing”. The tensile strength is measured according to JIS K 7127.

  In the plastic film constituting the first base material layer 31, the tensile strength in the second direction D2 is 2.5 times or more, preferably 3 times or more, more preferably 4 times the tensile strength in the first direction D1. It is more than double. In the plastic film constituting the first base material layer 31, the tensile strength in the second direction D2 is, for example, 90 MPa or more and 500 MPa or less. The thickness of the 1st base material layer 31 is 10 micrometers or more and 40 micrometers or less, for example.

  As a material constituting the sealant layer 32, for example, polypropylene, polyethylene such as ethylene-methacrylic acid copolymer (EMMA), low density polyethylene (LDPE), or linear low density polyethylene (LLDPE) can be used. . For example, an unstretched polypropylene film can be used as the polypropylene. The thickness of the sealant layer 32 is, for example, 15 μm or more and 60 μm or less. The sealant layer 32 may be composed of a single layer or may be composed of a plurality of layers.

  The print layer 33 includes a print display for displaying product information or giving aesthetics to the bag 10. Examples of the print display include letters, numbers, symbols, figures, and patterns.

  As the functional layer 37, an appropriate layer can be selected according to required performance such as water vapor and other gas barrier properties, light shielding properties, and various mechanical strengths. For example, the packaging material 30 may further include a vapor deposition layer provided on the first base material layer 31 or the sealant layer 32 as the functional layer 37 having gas barrier properties. A vapor deposition layer contains the substance which has gas barrier properties, such as inorganic substances, such as aluminum, and inorganic oxides, such as aluminum oxide and silicon oxide, for example.

The second base material layer 35 includes at least paper. The basis weight of the paper is, for example, 15 g / m ² or more and 40 g / m ² or less.

Examples of the method for laminating the first base material layer 31, the sealant layer 32, the second base material layer 35, and the like include a dry laminating method and an extrusion laminating method.
In the dry laminating method, the first base material layer 31, the sealant layer 32, the second base material layer 35, and the like are bonded together using an adhesive. In this case, the first adhesive layer 34 and the second adhesive layer 36 include an adhesive such as an ether adhesive.
In the extrusion laminating method, for example, a material in a molten state constituting the sealant layer 32 is extruded on the first base material layer 31 in a film form. In this case, the adhesive layer may not be present between the first base material layer 31 and the sealant layer 32 or between the first base material layer 31 and the second base material layer 35.
The thickness of the 1st contact bonding layer 34 is 1 micrometer or more and 20 micrometers or less, for example. Moreover, the thickness of the 2nd contact bonding layer 36 is 1 micrometer or more and 20 micrometers or less, for example.

A specific example of the layer configuration of the packaging material 30 in FIG. 4 is shown below. “/” Represents a boundary between layers. The leftmost layer is a layer constituting the outer surface 302 of the packaging material 30, and the rightmost layer is a layer constituting the inner surface 301 of the packaging material 30.
Stamp / Paper / DL / Transverse OPP / DL / Metal Deposition Layer / CPP
“Mark” means a print layer constituting a print display. “DL” is an abbreviation for dry laminate, and means that an adhesive layer containing an adhesive is present. “Laterally split OPP” means a biaxially oriented polypropylene film having the properties of lateral tear. “CPP” means an unstretched polypropylene film.

(Structure of easily breakable part)
Next, the structure of the easily breakable part 20 will be described. FIG. 5 is a cross-sectional view showing a state in which the second surface of the bag is bent so that the first surface of the palm portion and the first surface of the bag are parallel to each other. FIG. 6 is a plan view of the easily breakable portion 20 of FIG. 5 as seen from the VI direction.

  The easily breakable portion 20 has a plurality of partial through portions 201. The partial penetration portion 201 is a hole provided on the outer surface 302 side of the packaging material 30 so as to penetrate at least the first base material layer 31 and not penetrate the sealant layer 32. The plurality of partial through portions 201 are arranged along at least the second direction D2. Moreover, as shown in FIG. 6, the some partial penetration part 201 may be located in a line in the 1st direction D1. As shown in FIGS. 5 and 6, in the state where the second surface 11 b of the bag 10 is bent so that the first surface 17 a of the palm portion 17 and the first surface 11 a of the bag 10 are parallel, the easily breakable portion 20. Among them, the width W1 in the second direction D2 of the portion provided on the first surface 17a of the palm portion 17, that is, the existence range of the partial penetration portion 201 in the second direction D2 is, for example, 5 mm or more and 15 mm or less. Moreover, in the said state, the width W2 in the 2nd direction D2 of the part provided in the 1st surface 11a of the bag 10 among the easily breakable parts 20, ie, the presence range of the partial penetration part 201 in the 2nd direction D2, for example, It is 5 mm or more and 15 mm or less.

  The partial penetration part 201 shown in FIG. 6 is formed by processing the packaging material 30 from the 1st base material layer 31, for example using tools, such as a file and a cutting blade.

  Next, other examples of the easily breakable portion 20 will be described. 7A to 7E are plan views showing other examples of the easily breakable portion 20.

  The partial penetration part 201 may have a shape extending in a predetermined direction. For example, as illustrated in FIG. 7A, the partial through portion 201 may extend along the second direction D2. In this case, as shown in FIG. 7A, the plurality of partial through-holes 201 may be arranged on the same straight line in the second direction D2, and arranged in a staggered pattern in the first direction D1. For example, when a plurality of partial through portions 201 arranged in the second direction D2 in the row L1 are viewed from the first direction D1, the partial through portions 201 in the row L1 are arranged in the second direction D2 in the row L2 adjacent to the row L1. You may overlap with the clearance gap between the some partial penetration parts 201 located in a line. According to the partial penetration part 201 shown to FIG. 7A, it can make it easy to advance a fracture | rupture in the easily breakable part 20 along the 2nd direction D2.

  Moreover, as shown to FIG. 7B, the partial penetration part 201 may be extended along the 1st direction D1. In this case, the plurality of partial through portions 201 may be arranged on the same straight line in the first direction D1, and arranged in a staggered pattern in the second direction D2. For example, when the plurality of partial through portions 201 arranged in the first direction D1 in the row L1 are viewed from the second direction D2, the partial through portions 201 in the row L1 are arranged in the first direction D1 in the row L2 adjacent to the row L1. You may overlap with the clearance gap between the some partial penetration parts 201 located in a line. 7B, when the breaking of the palm portion 17 started from the opening start portion 23 reaches the vicinity of the base portion 173 of the palm portion 17, the vicinity of the base portion 173 of the palm portion 17 starts. The bag 10 can be easily broken.

  Further, as shown in FIG. 7C, the partial through portion 201 includes a first partial through portion 201a extending in a predetermined direction and a second partial through portion 201b extending in a direction different from the first partial through portion 201a. You may go out. For example, the first partial penetrating portion 201a is configured such that the first partial penetrating portion 201a is displaced in the eleventh direction D11 as it goes in the direction from the distal end portion 172 of the palm portion 17 toward the base portion 173. On the other hand, the 2nd partial penetration part 201b is comprised so that the 2nd partial penetration part 201b may be displaced to the 12th direction D12 as it goes to the direction which goes to the base part 173 from the front-end | tip part 172 of the palm part 17. FIG. As shown in FIG. 7C, the plurality of first partial through portions 201a and the plurality of second partial through portions 201b may be arranged along the second direction D2. In the first direction D1, the first partial through portion 201a and the second partial through portion 201b may be arranged in a staggered manner. For example, when the plurality of first partial through portions 201a arranged in the second direction D2 are viewed from the first direction D1, the first partial through portions 201a are arranged in the plurality of second partial through portions 201b arranged in the second direction D2. It may overlap the gap between them. In addition, when the first partial through portion 201a and the second partial through portion 201b are viewed from the second direction D2, the first partial through portion 201a and the second partial through portion 201b are arranged so as to partially overlap each other. May be. According to the 1st partial penetration part 201a and the 2nd partial penetration part 201b shown to FIG. 7C, the displacement of the fracture | rupture path | route in the 1st direction D1 arises alternately in the 11th direction D11 and the 12th direction D12, and a zigzag-shaped fracture | rupture A path is realized. Thereby, it is possible to facilitate breakage along the second direction D2.

  Moreover, the 1st partial penetration part 201a demonstrated in the example shown to FIG. 7C and the 2nd partial penetration part 201b may be arrange | positioned in arrangement | positioning methods other than zigzag in the 1st direction D1, as shown to FIG. 7D. For example, as shown in FIG. 7D, when a plurality of first partial through-holes 201a arranged in the second direction D2 are viewed from the first direction D1, they overlap with adjacent second partial through-holes 201b in the first direction D1. The first partial through-hole 201a may be disposed. The same applies to the second partial through portion 201b. Even in this case, as in the example shown in FIG. 7C, the displacement of the fracture path in the first direction D1 occurs alternately in the eleventh direction D11 and the twelfth direction D12, thereby realizing a zigzag fracture path. Is done. Thereby, it is possible to facilitate breakage along the second direction D2. In this case, as shown in FIG. 7D, of both end portions of the first partial penetration portion 201a, the end portion on the direction side from the distal end portion 172 of the palm portion 17 toward the base portion 173, and the second partial penetration portion 201b Of the two end portions, the end portion on the direction side from the distal end portion 172 of the palm portion 17 toward the base portion 173 may be connected. Or, although not shown in the drawings, of the both end portions of the first partial penetration portion 201a, the end portion on the direction side from the distal end portion 172 of the palm portion 17 toward the base portion 173 and the both end portions of the second partial penetration portion 201b, The end portion on the direction side from the distal end portion 172 to the base portion 173 of the palm portion 17 may not be connected.

  7C and 7D, the first partial through portion 201a described in the example shown in FIG. 7C includes, for example, a plurality of first partial through portions 201a arranged in the second direction D2 from the first direction D1, as shown in FIG. 7E. When viewed, the two first partial through portions 201a adjacent in the second direction D2 may be arranged so as to overlap each other. The same applies to the second partial through portion 201b. According to the first partial penetration portion 201a and the second partial penetration portion 201b shown in FIG. 7E, before the breakage of the first partial penetration portion 201a and the first second partial penetration portion 201b ends, Since the breakage of the first partial penetration part 201a and the second partial penetration part 201b adjacent to the one partial penetration part 201a and the one second partial penetration part 201b in the second direction D2 starts, the fracture proceeds in the first direction D1. Can be suppressed. For this reason, in the easily breakable part 20, a break can be easily advanced effectively along the 2nd direction D2. In this case, as shown in FIG. 7E, of both end portions of the first partial penetration portion 201a, the end portion on the direction side from the distal end portion 172 of the palm portion 17 toward the base portion 173, and the second partial penetration portion 201b Of the two end portions, the end portion on the direction side from the distal end portion 172 to the base portion 173 of the palm portion 17 may not be connected. Alternatively, although not illustrated, as in FIG. 7D, the end portion on the direction side from the distal end portion 172 of the palm portion 17 toward the base portion 173 and the second partial penetration portion 201b among the both end portions of the first partial penetration portion 201a. Among the two end portions, the end portion on the direction side from the distal end portion 172 to the base portion 173 of the palm portion 17 may be connected.

  The easily breakable portion 20 may be applied by combining the structures described in the examples shown in FIGS. 6 to 7E. For example, the partial penetration part 201 demonstrated in the example shown to FIG. 7A is formed in the 1st surface 17a of the palm part 17, and the partial penetration part demonstrated in the example shown to FIG. 7B in the 1st surface 11a of the surface 11 201 may be formed. In this case, it is possible to facilitate breakage of the palm portion 17 toward the base portion 173 of the palm portion 17, and the bag 10 is broken on the first surface 11 a starting from the vicinity of the base portion 173 of the palm portion 17. It can be made easier.

  FIG. 8 is a cross-sectional view of the easily breakable portion 20 of FIG. 5 as viewed from the VIII-VIII direction. In the example shown in FIG. 8, the packaging material 30 has the layer structure shown in FIG. In this case, the partial penetration part 201 penetrates, for example, the printing layer 33, the second base material layer 35, the second adhesive layer 36, and the first base material layer 31, but the first adhesive layer 34, the functional layer 37, and the sealant. Do not penetrate layer 32.

  A first example of a method for manufacturing the packaging material 30 provided with the partial through-holes 201 shown in FIG. 8 will be described. First, the 2nd base material layer 35 in which the printing layer 33 was provided, and the 1st base material layer 31 are bonded together through the 2nd contact bonding layer 36, and the laminated body 38 is produced. Subsequently, the laminated body 38 is processed by using a rotary die roll having a cutting edge or the like to form a through hole in the laminated body 38. Thereafter, an adhesive was applied to the laminated body 38 in which the through holes were formed and dried to form the first adhesive layer 34, and the laminated body 38 and the functional layer 37 were provided via the first adhesive layer 34. The sealant layer 32 is bonded together. In this way, the printed body 33, the second base material layer 35, the second adhesive layer 36, and the first base material layer 31 that have formed the laminated body 38 are penetrated, but the first adhesive layer 34 and the functional layer 37 are included. The packaging material 30 provided with the partial through-holes 201 that do not penetrate the sealant layer 32 can be obtained.

  The cross-sectional structure of the partial through portion 201 will be described in more detail. FIG. 9 is an enlarged cross-sectional view showing an example of the partial through portion 201. The partial through-hole 201 shown in FIG. 9 is an example of a hole formed when a cutting blade is inserted from the second base material layer 35 side into the laminate 38 including the first base material layer 31 and the second base material layer 35. It is. In this case, since the cutting edge comes into contact with the second base material layer 35 before the first base material layer 31, the second base material layer 35 is formed on the wall surface 202 of the partial through-hole 201 as shown in FIG. The first base material layer 31 is located on the center side of the partial through-hole 201.

  Hereinafter, in the wall surface 202 of the partial penetration part 201, the advantage that the 2nd base material layer 35 is located in the center side of the partial penetration part 201 rather than the 1st base material layer 31 is demonstrated. When the adhesive is applied to the laminated body 38 including the first base material layer 31 and the second base material layer 35 and having the through hole (partial through portion 201), the adhesive passes through the through hole of the laminated body 38. It is conceivable that the air leaks to the outer surface 302 side. Here, according to the laminated body 38 provided with the through-hole (partial penetration part 201) shown in FIG.8 and FIG.9, the second base material layer 35 including paper located on the wall surface 202 of the partial penetration part 201 is provided. Can absorb the adhesive. For this reason, it can suppress that an adhesive agent leaks to the outer surface 302 side.

  When putting a cutting blade into the laminated body 38 including the first base material layer 31 and the second base material layer 35 from the second base material layer 35 side, as shown in FIG. An edge portion on the 31st side may protrude to the inner surface 301 side. In this case, as shown in FIG. 9, a raised portion 303 may appear on the inner surface 301 of the packaging material 30.

  As shown in FIG. 9, the cross-sectional area of the partial penetration portion 201 may increase as it goes from the second base material layer 35 side to the first base material layer 31 side. Such a cross-sectional shape is obtained by, for example, using the method of putting a cutting blade from the second base material layer 35 side into the laminated body 38 including the first base material layer 31 and the second base material layer 35 to make the partial through-holes 201. May appear when forming.

  Although not shown, the partial through-hole 201 is formed using a method in which a cutting blade is inserted from the first base material layer 31 side into the laminate 38 including the first base material layer 31 and the second base material layer 35. May be.

  Next, a second example of the method for manufacturing the packaging material 30 provided with the partial through-holes 201 shown in FIG. 8 will be described. For example, first, the packaging material 30 having the laminate 38 and the sealant layer 32 bonded to the laminate 38 is prepared, and then the packaging material 30 is irradiated with laser light from the outer surface 302 side of the packaging material 30. Thereby, the partial penetration part 201 can be formed in the packaging material 30.

  When using a laser processing method, the packaging material 30 preferably includes a stopper layer that is not destroyed by laser light, such as a metal vapor deposition layer. In this case, the partial penetration portion 201 is formed in the packaging material 30 as a hole that penetrates the layer closer to the outer surface 302 than the stopper layer but does not penetrate the stopper layer and the layer closer to the inner surface 301 than the stopper layer. For this reason, for example, by providing a stopper layer such as a metal vapor deposition layer on the outer surface 302 side of the sealant layer 32, it is possible to form the partial penetration portion 201 that penetrates at least the first base material layer 31 but does not penetrate the sealant layer 32. it can.

Unsealing method bag Next, a method of opening a bag 10 described above will be described with reference to FIGS.

  First, the user picks the knob 24 between the pair of cuts 23 a constituting the opening start portion 23 in the palm portion 17, and starts breaking the bag 10 with the opening start portion 23 as a starting point. At this time, as shown in FIG. 10A, the user rotates the knob 24 so that, for example, the palm 17 is separated from the first surface 11a of the surface 11. At this time, the breaking of the palm portion 17 is started from the opening start portion 23 provided in the palm portion 17.

  Subsequently, as shown in FIG. 10 (b), the user pulls the knob 24 toward the side end 15 b out of the pair of side ends 15 a and 15 b. Here, in the present embodiment, an easily breakable portion 20 extending along the first direction D1 is provided in the bag 10 so as to straddle the base portion 173 of the palm portion 17 from the first end portion 13 to the second end portion 14. It has been. For this reason, as shown in FIG.10 (c), the bag 10 can be fractured | ruptured from the base 173 vicinity of the palm part 17 as a starting point. The first base material layer 31 has a tensile strength in the second direction D2 of 2.5 times or more of the tensile strength in the first direction D1. Thereby, the 1st base material layer 31 becomes easy to be torn along the 2nd direction D2, and the fracture | rupture of the bag 10 can be advanced linearly along the 2nd direction D2. Then, the user breaks the second surface 11b of the surface 11 of the bag 10 by pulling the knob portion 24 to the side end portion 15b side of the pair of side end portions 15a and 15b.

  Next, the user breaks the back surface 12 of the bag 10 by pulling the knob portion 24 toward the side end portion 15a of the pair of side end portions 15a and 15b, as shown in FIG. . Subsequently, as shown in FIG. 11B, the user pulls the knob 24 toward the side end 15 b to break the first surface 11 a of the bag 10. And as shown in FIG.11 (c), the strip | belt-shaped opening removal piece X is removed. In this manner, as shown in FIG. 12, an opening 25 extending between the pair of side end portions 15a and 15b can be formed in the bag 10. Thereby, when the breakage of the bag 10 does not proceed linearly and the breakage of the bag 10 stops at the first end portion 13 or the second end portion 14 before reaching the side end portions 15a, 15b. In comparison, the ease of taking out the contents 19 can be improved.

  Various modifications can be made to the above-described embodiments. Hereinafter, modified examples will be described. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in each of the above embodiments. The duplicated explanation is omitted. In addition, when it is clear that the operational effects obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

(First modification)
FIG. 13 is a plan view showing the bag 10 according to the first modification. As shown in FIG. 13, the easily breakable portion 20 may be provided so as to straddle the base portion 173 of the palm portion 17 in a partial region from the first end portion 13 to the second end portion 14. In this case, the unsealing start part 23 is provided in a position overlapping the easily breakable part 20 when viewed along the second direction D2 in the palm portion 17. That is, the easily breakable part 20 is spread so as to straddle the opening start part 23 in the first direction D1 in plan view. Even in this case, the opening start portion 23 is a trigger for breaking the bag 10 along the easily breakable portion 20, and the bag 10 can be broken along the easily breakable portion 20. When the bag 10 is broken, the breakage easily occurs in the vicinity of the base portion 173 of the palm portion 17 on the first surface 11 a of the bag 10.

(Second modification)
FIG. 14 is a plan view showing a bag 10 according to a modification. FIG. 15 is a cross-sectional view of the bag 10 of FIG. 14 viewed from the XV-XV direction. As shown in FIGS. 14 and 15, the easily breakable portion 20 includes a first easily breakable portion 20 a formed on the first surface 11 a of the surface 11 and the first surface 17 a of the palm portion 17, and a second surface of the surface 11. 11b and a second easily breakable portion 20b formed on the second surface 17b of the palm portion 17. Thus, the easily breakable portion 20 may be provided so as to straddle the base portion 173 on the first surface 17a side and the base portion 173 on the second surface 17b side of the palm portion 17. In this case, the structure of the first easily breakable portion 20a and the structure of the second easily breakable portion 20b may be different from each other. For example, you may make the density of the partial penetration part 201 of the 2nd easy fracture part 20b lower than the density of the partial penetration part 201 of the 1st easy fracture part 20a.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to description of a following example, unless the summary is exceeded.

Example 1
As the first base material layer, the biaxially stretched polypropylene film described in the configuration of the first base material layer (Toray Film Processing Co., Ltd., Treffan YT42, thickness 25 μm) was prepared. At this time, in the biaxially stretched polypropylene film, the tensile strength in the second direction D2 was about 4.71 times the tensile strength in the first direction D1. The tensile strength was measured according to JIS K 7127.

Moreover, the paper of the basic weight 23g / m < ² > demonstrated with the structure of the above-mentioned 2nd base material layer was prepared as a 2nd base material layer. Subsequently, a printing layer was formed by gravure printing on a surface located on the outer surface side of the paper when the packaging bag was configured.

  Further, a laminate 38 shown in FIG. 8 was produced by laminating paper and a biaxially stretched polypropylene film by a dry laminating method. Then, the laminated body 38 was processed using the rotary die roll provided with the cutting blade, and the through-hole (partial penetration part 201) was formed in the laminated body 38. FIG.

  Moreover, the non-stretched polypropylene film (thickness 20 micrometers) demonstrated by the structure of the above-mentioned sealant layer was prepared as a sealant layer. Subsequently, an aluminum vapor deposition film having a thickness of 500 mm was formed as a functional layer on the surface of the unstretched polypropylene film located on the outer surface side when forming the packaging bag. Thus, the unstretched polypropylene film in which the vapor deposition layer was formed in the outer surface side was obtained.

Then, the unstretched polypropylene film and the laminated body 38 were laminated | stacked by the dry lamination method, and the packaging material 30 shown in FIG. 8 was produced. The layer structure of the packaging material 30 is expressed as follows.
Stamp / Paper / DL / Transverse OPP / DL / Deposited layer / CPP
“/” Represents a boundary between layers. The leftmost layer is a layer constituting the outer surface of the packaging material, and the rightmost layer is a layer constituting the inner surface of the packaging material.
“Mark” means a printed layer. “DL” means an adhesive layer containing an adhesive. “Laterally split OPP” means a biaxially oriented polypropylene film having the properties of lateral tear. “CPP” means an unstretched polypropylene film.

  The adhesive layer between the paper and the biaxially stretched polypropylene film contains a two-component curable adhesive (manufactured by Rock Paint Co., Ltd., main agent: RU-40, curing agent: H-4). The adhesive layer between the biaxially stretched polypropylene film and the unstretched polypropylene film contains a two-part curable adhesive (manufactured by Rock Paint Co., Ltd., main agent: RU-40, hardener: H-4).

(Example 2)
A packaging material was produced in the same manner as in Example 1 except that a uniaxially stretched polyethylene film (Denka Co., Ltd., Kalarian Y, thickness 18 μm) was used as the first substrate layer. At this time, in the uniaxially stretched polyethylene film, the tensile strength in the second direction D2 was about 6.67 times the tensile strength in the first direction D1.

The layer structure of the packaging material in Example 2 is expressed as follows.
Stamp / Paper / DL / Transverse PEF / DL / Deposited layer / CPP
“Laterally split PEF” means a uniaxially stretched polyethylene film having the properties of lateral tear.

(Comparative example)
A packaging material was produced in the same manner as in Example 1 except that a biaxially stretched polypropylene film (Toyobo Co., Ltd., P2161, thickness 25 μm) was used as the first base material layer. At this time, in the biaxially stretched polypropylene film, the tensile strength in the second direction D2 was about 2.33 times the tensile strength in the first direction D1.

The layer structure of the packaging material in Comparative Example 1 is expressed as follows.
Stamp / Paper / DL / Transverse OPP / DL / Deposited layer / CPP

<Manufacture of bags>
The sealant layers of the packaging materials obtained in Example 1, Example 2, and Comparative Example were heat sealed to produce a bag shown in FIG.

<Opening test>
After putting plate-like chocolate into the bag obtained above, it was sealed and sealed. And the sealed bag was opened by the method demonstrated in FIG.10 and FIG.11, and openability was evaluated. The evaluation results are shown in Table 1.
(Evaluation criteria)
○: The breakage of the bag proceeded linearly along the second direction D2, and an opening spread between the pair of side end portions could be formed in the bag.
X: The breakage of the bag did not proceed linearly, and the breakage of the bag stopped at the first end or the second end before reaching the side end.

  The results of the above opening test are shown in Table 1. As shown in Table 1, in the comparative example in which the tensile strength of the first base material layer in the second direction D2 was about 2.33 times the tensile strength of the first base material layer in the first direction D1, as shown in Table 1. The bag breakage did not proceed linearly, and the bag breakage stopped at the first end or the second end before reaching the side end. On the other hand, in Example 1 and Example 2 in which the tensile strength of the first base material layer in the second direction D2 is 2.5 times or more the tensile strength of the first base material layer in the first direction D1. The breakage of the bag proceeded linearly along the second direction D2, and an opening spread between the pair of side end portions could be formed in the bag.

  In addition, although some modified examples with respect to the above-described embodiment have been described, naturally, a plurality of modified examples can be applied in combination as appropriate.

DESCRIPTION OF SYMBOLS 10 Bag 11 Front surface 12 Back surface 13 1st end part 131 1st end part seal part 14 2nd end part 141 2nd end part seal part 15 Side end part 17 Joint part 171 Joint part seal part 172 Tip part 173 Base part 20 Easy break Part 20a First easily breakable part 20b Second easily breakable part 201 Partial penetration part 202 Wall surface 23 Opening start part 23a Incision 30 Packaging material 31 First base material layer 32 Sealant layer 34 First adhesive layer 35 Second base material layer

Claims (6)

A bag formed of a packaging material including a first base material layer and a sealant layer, and having a front surface and a back surface,
A first end;
A second end facing the first end in the first direction;
A palm portion extending from the first end portion to the second end portion in the first direction and overlaid with the packaging material on the surface side;
A seal portion that joins the inner surfaces of the packaging material at the first end, the second end, and the palm portion;
Provided on the surface and the palm portion, and an easily breakable portion that spreads across the base of the palm portion, and
The tensile strength of the first base material layer in the second direction orthogonal to the first direction is 2.5 times or more the tensile strength of the first base material layer in the first direction;
A plurality of notches or a plurality of cuts extending along the second direction from the tip of the palm portion at a position overlapping with the easily breakable portion of the palm portion when viewed along the second direction. An opening start portion including at least,
The easily breakable portion is a bag having a plurality of partially penetrating portions that penetrate at least the first base material layer and do not penetrate the sealant layer. The packaging material further includes a second base material layer that is located on the outer surface side of the bag relative to the first base material layer and includes paper,
The bag according to claim 1, wherein the partially penetrating portion of the easily breakable portion is configured to penetrate at least the first base material layer and the second base material layer and not penetrate the sealant layer. The packaging material further includes a first adhesive layer located between the first base material layer and the sealant layer,
The bag according to claim 2, wherein the second base material layer is located closer to the center of the partial penetrating part than the first base material layer on the wall surface of the partial penetrating part.   The bag according to claim 3, wherein the packaging material further includes a second adhesive layer located between the first base material layer and the second base material layer.   The bag according to claim 3 or 4, wherein a cross-sectional area of the partial penetrating portion increases from the second base material layer side toward the first base material layer side.   The bag according to any one of claims 1 to 5, wherein the easily breakable portion extends along the first direction from the first end portion to the second end portion.

Images