JP2014037264A - Back lining packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back lining packaging bag that can be opened easily, safely and comfortably.SOLUTION: A back lining packaging bag is configured by: folding a piece of packaging film having a peelable adhesive layer on a single side of a base film layer with the peelable adhesive layer surface as inside; forming a back lining sealing part by sealing both right and left ends with twofold; and forming a top and bottom sealing part by sealing both top and bottom ends perpendicular to the back lining sealing part. The back lining packaging bag is characterized in that either one end of the right and left ends of the back lining sealing part projects from the back lining sealing part to form a flap, a cut line shorter than the width of the top and bottom sealing part is formed in either one of right and left packaging films at the root portion on the top and bottom sealing part of the back lining sealing part; and the seal strength of the top and bottom sealing part is 1-25 N/15 mm.

Description

  The present invention relates to a packaging bag excellent in easy-opening property, and more particularly to an easily-opening back-sticking packaging bag having a palm-and-back attachment part.

  One packaging film is folded into a cylindrical shape with the sealant layer on the inside, and the left and right end portions are formed into a cylindrical shape by joint sealing, and the upper and lower end portions are sealed, so-called back-bonded palm bags (hereinafter referred to as back). The adhesive packaging bag is widely used for various packaging applications because it has an advantage that it can be continuously produced from a single packaging film by a simple process.

  As shown in FIG. 6, the most common opening form for the back-wrapping packaging bag is to provide an opening notch (27) in either of the upper and lower sealing portions (23), (24), and from there A form that tears in the direction and opens is common. In this example, after filling the contents (21), the seal portions (23) and (24) are integrally formed, and then the center portion of the seal portion is separated with a cutting blade including a V-shaped notch, thereby opening the notch It is possible to efficiently produce a back-packed package.

  However, in such an open type packaging bag, the tear of the bag starting from the opening notch (27) hits the contents (21) and does not advance, or if you try to open it forcibly, the contents will be damaged. And the problem that the tears escape to the outside of the bag and a sufficient opening cannot be obtained tends to occur, which is insufficient in terms of openability.

  Each of the packaging bags or packages described in Patent Documents 1 to 5 is made for the purpose of improving the openability of the back-sticking packaging bag or for the purpose accompanying it.

  The invention described in Patent Document 1 uses an easily peelable seal that can be opened on the back-sealed seal portion, leaves an unsealed ear portion on the back-sealed seal portion, and opens the back-sealed seal portion with this ear portion. The present invention relates to an improvement of a package that can be made.

  As described above, in the opening method for directly opening the back-sealed seal portion, since the opening portion is linear, in order to take out the contents, there is an inconvenience that the hand must be put in the bag and taken out. Moreover, since the opening operation is an operation of grasping and peeling off the ear portion with both hands, there is a possibility that the contents pop out at the time of opening.

  The easy-open packaging bag described in Patent Document 2 heat-seals the upper and lower end edges orthogonal to the back-sticking seal part so as to be peelable, and the unsealed part and two at the back-sticking seal part position of the edge part. The cut line is provided, and the unsealed part is grasped, and the back-sealed seal part between the two cut lines is opened so as to be cut out with a certain width in the vertical direction.

  Since the easy-open packaging bag described in Patent Document 2 has an opening notch in the center of the seal portion at the upper and lower edges, the edge is easily caught and there is a problem in the transportability of the packaging bag. In addition to catching a finger on the notch, it may cause injury, and the back-pasted seal portion that has been cut off is separated to generate dust.

  The packaging bags or packages described in Patent Documents 3 to 5 are all provided with a back-sealing seal part that triggers opening, and the bag is opened in a direction perpendicular to the back-sticking seal part so that the bag is cut at a certain width. To do.

  According to this unsealing method, since the unsealed packaging bag is divided into three parts, in addition to inconvenience in handling, the packaging bag described in Patent Document 4 uses a tape for unsealing, thus increasing the cost. It is also a factor.

Japanese Patent No. 4456598 Japanese Patent No. 4139620 Japanese Patent No. 4131138 Japanese Patent No. 4272869 Japanese Patent No. 3578419

  The present invention has been made to solve the above problems, and proposes a back-sticking packaging bag that can be opened easily, safely, and comfortably.

As a means for solving the above-mentioned problems, the invention according to claim 1 is a method of bending a single packaging film having an easily peelable adhesive layer on one side of a base film layer with the easily peelable adhesive layer surface inside. The back and right end seals are formed into a back-sticking seal part, a back-sticking seal part is formed, and the top and bottom end parts orthogonal to the back-sticking seal part are sealed to form a top and bottom seal part, The back sticker seal part has a left or right end projecting from the back sticker seal part to form a flap, and the base part of the back sticker seal part on the upper and lower seal parts is either left or right The wrapping film is formed with a cut line shorter than the width of the upper and lower sealing portions, and the sealing strength of the upper and lower sealing portions is 1 to 25 N / 15 mm.

  Since the back-sticking packaging bag according to the present invention has an easy-peeling adhesive layer with a seal strength of 1 to 25 N (Newton) per 15 mm width as a sealant, and a cut line is provided at the base of the back-sticking seal part, the back-sticking seal part By pulling, the packaging film can be torn from the cut line and opened along the root of the back-sealed seal portion.

  Further, in the invention according to claim 2, a fragile processed part is formed along the back-sticking seal part in a portion nearest to the back-sticking seal part of the packaging film on the side where the cut line is formed. The back-sticking packaging bag according to claim 1.

  Further, the invention according to claim 3 is the back-sticking packaging bag according to claim 1 or 2, wherein the packaging film has easy tearability in a direction parallel to the back-sticking seal portion. .

  In addition, the invention according to claim 4 is characterized in that the easily peelable adhesive layer is partially provided on a base film, and the back sticking according to any one of claims 1 to 3 It is a packaging bag.

  The back-sticking packaging bag according to the present invention has a sealant with an easily peelable adhesive layer having a seal strength of 1 to 25 N per 15 mm width, and can be opened along the back-sticking seal part with a flap protruding from the back sticker seal part. Therefore, it can be opened by pulling the flap in a direction parallel to the table while the bag is placed on a flat table. For this reason, the contents can be opened safely, easily and comfortably without popping out.

The back sticker seal part is designed so that either the left or right end protrudes from the back sticker seal part to form a flap, so it can be easily opened with this flap when opened, and it can be opened on the flap. Necessary information such as method and opening direction can be printed and displayed.

  Moreover, since the back-sticking packaging bag (1) according to the present invention uses the sealant as an easily peelable adhesive layer, all of the upper and lower seal portions (3) and (4) can be peeled and peel-opened. For this reason, it has the big characteristic that the packaging bag after taking out the contents can be utilized as a packaging material for repackaging by opening it flatly.

  Next, in the invention according to claim 2, a fragile processed part is formed along the back sticker seal part in a portion nearest to the back sticker seal part of the packaging film on the side where the cut line is formed. Therefore, the packaging film is easily cut along the back-sticking seal portion, and the opening is smoother.

  Moreover, like the invention of Claim 3, when a packaging film has easy tearability in the direction parallel to the said back sticking seal | sticker part, opening property becomes still smoother.

  In the invention according to claim 4, it is possible to partially form the easily peelable adhesive layer only on a necessary portion by a printing method, which leads to shortening of the process and saving of materials.

FIG. 1 is a perspective view showing an embodiment of a back-sticking packaging bag according to the present invention. FIG. 2 is an enlarged view of a portion surrounded by a circle in FIG. FIG. 3 is a perspective view showing a state in which opening of the back-wrapping packaging bag shown in FIG. 1 is started. FIG. 4 is a perspective view showing a state in which the opening is further advanced from the state of FIG. FIG. 5 is a schematic plan view showing a state where the back-packed packaging bag shown in FIG. 1 is completely opened and developed. FIG. 6 is an explanatory view showing an example of a conventional back-sticking packaging bag.

Hereinafter, the back-sticking packaging bag according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of a back-sticking packaging bag according to the present invention. FIG. 2 is an enlarged view of a portion surrounded by a circle in FIG. 3 is a perspective view showing a state where opening of the back-sticking packaging bag shown in FIG. 1 is started, and FIG. 4 is a perspective view showing a state where the opening is further advanced from the state of FIG. . FIG. 5 is a schematic plan view showing a state where the back-attached packaging bag shown in FIG. 1 is completely opened and developed. This will be described below with reference to these drawings.

  The back-wrapping packaging bag (1) according to the present invention is formed by folding a single packaging film having an easily peelable adhesive layer on one side of a base film layer along a fold line (9) with the easily peelable adhesive layer surface inside. The left and right ends are sealed together to form the back-sealed seal portion (5), and the upper and lower end portions orthogonal to the back-sealed seal portion (5) are further sealed to form the upper seal portion (3) and the lower seal portion. This is a back-packed packaging bag formed by (4).

  As for a back sticking seal | sticker part (5), either one of right and left ends protrudes from the back sticking seal part (5) to form a flap (6). 1-4, the left end forms a flap (6).

  By forming the flap (6), the flap (6) can be grasped and opened easily when opened. In addition, the flap (6) can be printed with necessary information such as information on the product and how to open it.

  The flap (6) has a seal bar at the same time as the upper and lower seal portions in a state where the upper and lower seal portions (3) and (4) are sealed and brought into close contact with the bag body after the back-sealed seal portion (5) is formed. Therefore, it is inevitable that the end portion of the flap (6) is uneven due to the seal bar.

  A cut line (7) shorter than the width of the upper and lower seal portions is formed on the base film on the upper and lower seal portions (3) and (4) of the back sticker seal portion (5) on either the left or right packaging film. ing. In the example of FIG. 1, the cut line (7) is formed in the right packaging film, but a cut line may be provided in the left packaging film.

  The cut line (7) is desirably a depth that penetrates one of the left and right packaging films, but may be a half cut that does not penetrate. If the length is longer than the upper and lower seal widths, the sealing performance of the bag may be impaired. Therefore, it is desirable to make the length shorter than the seal width.

  As shown in FIG. 2, the position of the cut line (7) is preferably the base part on the lower seal part (4) of the back sticker seal part (5), but the back sticker seal part (5) It does not matter even if it is on the boundary line between the lower seal part (4) and the position slightly entering the lower seal part (4).

  The seal strength of the upper and lower seal portions (3) and (4) needs to be 1 to 25 N / 15 mm. If the seal strength is within this range, it can be easily opened by grasping the flap (6) with a hand and peel-opening the upper and lower seal portions. If the seal strength is less than 1 N / 15 mm, there is a possibility that trouble may occur in the sealing performance of the bag. The most desirable value of the seal strength of the upper and lower seal portions is 5 to 10 N / 15 mm.

  In the embodiment shown in FIG. 1, along the back-sticking seal portion, the fragile processing portion (8) is provided in the immediate vicinity of the back-sticking seal portion (5) of the packaging film on the side where the cut line (7) is formed. ) Is formed. For this reason, since the tear of the packaging film which started from the cut line (7) at the time of opening advances linearly along this weakly processed part (8), opening becomes smoother.

  As the type of fragile processing, half cutting with a laser or a cutting tool, rough surface processing with a rough surface roller, or the like can be used effectively. The fragile processing range may extend to the upper and lower seals.

  When the cut line (7) is a half cut that does not penetrate the packaging film, the fragile process and the cut line (7) may be formed as an integral unit.

  Since the back-sticking packaging bag (1) according to the present invention uses an easily peelable adhesive layer as a sealant, the upper and lower seal portions (3) and (4) can all be peel-opened. For this reason, it is possible to open the packaging bag after taking out the contents completely and to develop it flatly as shown in FIG.

  Thus, it is a great feature of the back-sticking packaging bag according to the present invention that the packaging film developed in a planar shape can be used as a packaging material for repackaging the contents.

  As the base film used for the back-packed packaging bag according to the present invention, known materials generally used for packaging materials can be used. Examples of materials used for the base film include low density polyethylene (LDPE) resin, high density polyethylene (HDPE) resin, linear low density polyethylene (LLDPE) resin, polypropylene (PP) resin, and polyolefin elastomer. In addition to polyolefin resins, polyester resins such as polyethylene terephthalate (PET) resin, polybutylene terephthalate (PBT) resin, polyethylene naphthalate (PEN) resin, and cellulose resins such as cellophane and cellulose triacetate (TAC) resin , Polymethyl methacrylate (PMMA) resin, ethylene-vinyl acetate copolymer resin (EVA), ionomer resin, polybutene resin, polyacrylonitrile resin, polyamide resin, polystyrene (PS) resin, polyvinyl chloride PVC) resins, polyvinylidene chloride (PVDC) resin, polycarbonate (PC) resin, fluorine resin, a synthetic resin film such as a urethane-based resin can be used alone or in combination.

  In addition, these synthetic resin films include a gas barrier film such as a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene vinyl alcohol copolymer film, a gas barrier nylon film, and a gas barrier polyethylene terephthalate (PET) film as a gas barrier layer, PET Metal-deposited film in which metal such as aluminum is deposited on film, inorganic oxide-deposited film in which inorganic oxide such as aluminum oxide or silicon oxide is deposited on PET film, or polyvinylidene chloride coating, water-soluble resin and inorganic A gas barrier coating layer such as a resin layer comprising a film containing a layered compound, a metal alkoxide or its hydrolyzate and an isocyanate compound, or a metal foil such as an aluminum foil. The can also be used in combination.

  By using a straight-cut film that is easy to cut in one direction for all or part of the base film, the unsealing property can be further improved. As the straight-cut film, a film using the anisotropy of a uniaxially stretched film is commercially available. When used in the back-packed packaging bag according to the present invention, a longitudinally uniaxially stretched film that can be easily cut in a direction parallel to the flow direction of the film can be used. By sticking such a film between the base film and the sealant film to form a packaging film, it is possible to impart easy tearability in the direction parallel to the back-sticking seal portion (5) to the packaging film.

  A publicly known easy peel sealant can be used as the easily peelable adhesive layer formed on these base films. When a film-like easy peel sealant is used as the easily peelable adhesive layer, it is used by being bonded to the entire surface of the base film.

You may employ | adopt the method of printing-forming only a required part using a coating-type easy peel sealant. According to this method, since an easily peelable adhesive layer can be formed while performing alignment on the back surface side at the same time as printing on the front surface side using a double-sided printing machine, it leads to saving of processes and materials.
Hereinafter, based on an example, the back pasting packing bag concerning the present invention is explained still more concretely.

  A PET film having a thickness of 12 μm was used as a base film, and a polyolefin easy peel sealant film was dry-laminated as an easily peelable adhesive layer to form a packaging film. Further, a uniaxially stretched PP linear cut film having a thickness of 20 μm was inserted between the base film and the easily peelable adhesive layer to prepare a packaging film having an improved easy tear property. Using these two types of packaging films, back-wrapped packaging bags were produced.

Samples of the following Examples 1 to 6 and Comparative Examples 1 to 9 were prepared by changing conditions for the presence or absence of a score line, presence or absence of fragile processing, and seal strength, and evaluation was performed according to the following evaluation items.
In addition, as the fragile processing, a half cut by a laser was used. Further, the seal strength is set to a target numerical value by changing the seal condition.

(Evaluation items and evaluation methods)
(1) Openability Grasping the flap part including the back-sealed seal part in the width direction, and tearing it diagonally upward from one of the upper and lower seal parts, the opening was ○, and the others were X Evaluated.
(2) Straight-cut property When grasping the flap part including the back sticker seal part in the width direction and tearing it diagonally upward from one of the upper and lower seal parts, it is torn along the back sticker part and opened. ○, other than that was evaluated as x, and the straight-cut openability was evaluated.
(3) Expandability Grasp the flap part including the back-sealed seal part in the width direction, and when the force is applied diagonally upward from one upper and lower seal part, it can be torn and opened, and the remaining upper and lower seal parts The spreadability was evaluated with a circle indicating that the sheet became a single sheet, a mark that was broken without being opened, or a tear that was separated from the upper and lower seals.
Table 1 shows the configuration and evaluation results of each sample.

  As can be seen from the results in Table 1, the back-sticking packaging bag according to the present invention is excellent in unsealability, and the unwrapped packaging film can be developed into a single flat film. Moreover, it turns out that linear cut property improves by adding easy tearability to a packaging film, or giving a weak process.

DESCRIPTION OF SYMBOLS 1 ... Back sticker packaging bag 2 ... Expanded packaging bag 3 ... Upper seal part 4 ... Lower seal part 5 ... Back sticker seal part 6 ... Flap 7 ... Cut line 8 ... Fragile processing part 9 ... Bending line 20 ... Conventional back-stick packaging bag 21 ... Contents 23 ... Upper seal part 24 ... Lower seal part 25 ... Back sticker seal part 27 ... Opening notch

Claims (4)

One sheet of packaging film having an easily peelable adhesive layer on one side of the base film layer is folded with the easily peelable adhesive layer surface inside, and both left and right ends are sealed together to form a back-sticking seal part,
Sealing the upper and lower ends perpendicular to the back-sticking seal part, forming a top-and-bottom seal part,
The back-sticking seal part has a flap that protrudes from the back-sticking seal part on either the left or right side,
At the base part on the top and bottom seal part of the back sticker seal part, a cut line shorter than the width of the top and bottom seal part is formed on either the left or right packaging film,
The back and forth packaging bag is characterized in that the sealing strength of the upper and lower sealing portions is 1 to 25 N / 15 mm.   The fragile processing part is formed along the back sticker seal part in the immediate vicinity part of the back sticker seal part of the packaging film in the side in which the cut line was formed. Back-packed packaging bag.   The back-wrapping packaging bag according to claim 1, wherein the packaging film has easy tearability in a direction parallel to the back-sticking seal portion.   The back-sticking packaging bag according to any one of claims 1 to 3, wherein the easily peelable adhesive layer is partially provided on a base film.