JP6819084B2 - Packaging bag - Google Patents

Description

The present invention relates to a packaging bag. In particular, when the bag is torn along the opening line provided to facilitate the opening of the bag, the torn end is not completely separated from the main body of the packaging bag and the opening is completed. It relates to a packaging bag having an opening line in its shape.

Easy-opening type packaging bags provided with an easy-opening line for making the tearing of the packaging bag easy and straight are well known and widely used.

In Patent Document 1, a U-shaped notch is provided on the outer edge at the opening position of the packaging bag, a notch is continuously cut, and one end of the packaging bag is separated by making a notch along the cut. A packaging bag that is designed to be opened in is disclosed. The cut is continuous in a straight line from the notch to the notch on the opposite side, and one end of the packaging bag is separated by making a tear from the notch to the notch on the opposite side.

Due to its usefulness, easy-to-open packaging bags are not limited to food-related products (beverages, seasonings, liquid materials, semi-cooked products), but also medical equipment / chemical-related products (infusions, chemicals, etc.), machinery-related products, and electronic parts-related products. It is widely used for both general household and industrial use in various fields.

However, such a packaging bag in which one end is separated by tearing it with an easy-opening line may cause a problem depending on the field in which it is used.

For example, in various manufacturing sites, when manufacturing materials, auxiliary materials, parts, etc. are supplied in such an easy-to-open packaging bag, the packaging bag separated when the bag is torn open and the contents are taken out. Since the fragments are small, they are overlooked or fall into gaps and are not properly disposed of, and there are problems such as being mixed into the final product.

In addition, when used in the medical field where emergency medical care and treatment for critically ill patients are performed, there are many urgent tasks in the medical field and it is busy, so attention to small fragments may not always be paid. As a result, the fragments were left unattended, and the fragments could be mixed with other materials or the adhered contents could cause contamination.

Alternatively, if these packaging bags are used during food processing, cooking, etc., the separated fragments may also be mixed into the product or the food being cooked, and once mixed, they will eventually be mixed. It was difficult to find until it was consumed, and it could be discovered by the final consumer and lead to major problems.

In addition, even if it is not mixed, if it is left dropped, the attached contents may be mixed with other chemicals or foods, and germs may propagate and be mixed into the product, which is a serious secondary problem. There was also the risk of causing disasters and infecting employees.

Japanese Unexamined Patent Publication No. 7-285559

The present invention has been made in view of such circumstances, and by providing an opportunity to terminate the tearing before the torn fragment is completely separated from the packaging bag when the packaging bag is torn and opened. It is an object of the present invention to provide a packaging bag in which fragments separated from the packaging bag are not generated and secondary disasters due to mixing or leaving of the separated fragments are unlikely to occur.

The invention according to claim 1 is a means for solving the above problems.
A packaging bag in which a base material and a sealant layer of a laminate having at least a sealant layer are opposed to each other to seal the peripheral portion.
The laminated bodies on the front side and the back side of the packaging bag are provided with easy-opening lines by scratch processing, respectively, and the easy-opening lines are abbreviated as the laminated bodies on the front side and the back side from one side edge portion toward the opposite side edge portion. A straight portion that extends linearly at the same position, and a front and back laminate that smoothly extends from the end of the straight portion to the end point in the direction of the opposite side edge , curved in opposite directions. Consists of curved parts
The angle between the tangent to the easy-open line and the straight part in the curved part increases as it approaches the end point.
During the opening, the inner surface of the laminate was exposed.
The packaging bag is characterized by satisfying the following equation (1), where d is the distance between the nearest point from the peripheral edge of the curved portion and the sealed region of the peripheral edge.
2 mm ≤ d ... Equation (1)

The invention according to claim 2 is the packaging bag according to claim 1, wherein when the distance between the end points of the laminated body on the front side and the back side is h, the following formula (2) is satisfied.
4 mm ≤ h ・ ・ ・ Equation (2)

The invention according to claim 3 is characterized in that the following equation (3) is satisfied when the size of the angle formed by the tangent line and the straight line portion in the vicinity of the end point of the curved portion is θ. The packaging bag according to any one of 2.
45 ° ≤ θ ・ ・ ・ Equation (3)

According to the present invention, the easy-opening wire provided on the packaging bag is provided so that the laminated body on the front side and the laminated body on the back side are curved in opposite directions at one end thereof, so that the tearing force is exerted. It is deflected, making it difficult to proceed with the tearing further, and the split piece can be completed without separating the torn part from the packaging bag, which triggers the user to finish the tearing. It is possible to provide a packaging bag that can eliminate the risk of being mixed with or left unattended to generate germs.

FIG. 6 is a partially enlarged schematic partial plan view for explaining one embodiment of the packaging bag of the present invention. Partial perspective schematic view of a partially enlarged packaging bag in the middle of tearing. Schematic diagram of the state of the force applied to each part as the tear progresses. Partially enlarged partial perspective schematic view of another packaging bag in the middle of tearing. Schematic diagram of a partial plane showing different embodiments of curved portions. The plan view which shows one Embodiment of the packaging bag of this invention. The partial cross-sectional schematic diagram for demonstrating one Embodiment of the layer structure of the packaging bag of this invention.

Hereinafter, a detailed description of the embodiment for carrying out the present invention will be added with reference to the drawings. However, the present invention is not limited to the examples shown here.

FIG. 6 is a schematic plan view showing an embodiment of the packaging bag for explaining the packaging bag according to the present invention. The packaging bag (10) according to the present invention is a rectangular packaging bag made of a laminate having at least a base material and a sealant layer. The packaging bag (10) is made by overlapping the sealant layers of the laminated body with each other facing each other and heat-sealing the peripheral portion.

In the example shown here, in the heat seal, the right side heat seal part (3), the bottom heat seal part (6), and the left side heat seal part (4) are heat-sealed, and the contents are filled from the opening at the top. After that, the top heat-sealed portion (5) is heat-sealed, and the contents are sealed in the packaging bag (10).

The right side heat seal part (3) facing the easy opening line (2) in the direction in which the tear progress is expected from the tip of the notch (1) provided on the outer edge of the left side heat seal part (4). It is provided in the direction of. The notch (1) is not essential, but it is preferable to provide it as a trigger for tearing. By tearing along the easy-opening line (2), the packaging bag (10) can be opened easily, reliably, and linearly.

FIG. 1 is a partially enlarged partial plan schematic view for explaining a packaging bag and an embodiment thereof according to the present invention. The easy-opening line (2) in the present invention is a straight portion (21) which is linear and is provided at substantially the same position on the front and back laminated bodies, and a curved portion (21) which is curved on the front and back laminated bodies in opposite directions. 22) consists of.

Here, d is the distance between the nearest point of the curved portion to the right side seal portion and the right side seal portion (3). In this example, it is the separation between the end point and the right side seal portion (3). h is the distance between the end points of the curved portion provided on the laminated body on the front side and the end points of the curved portion provided on the laminated body on the back side. Further, θ is the magnitude of the angle formed by the tangent line to the curved portion near the end point of the curved portion and the straight portion.

Here, the value of θ becomes larger as it approaches the end point.

FIG. 2 is a partially enlarged partial perspective schematic view of the packaging bag of the present invention, which is partially cut along the opening line, for explaining the packaging bag according to the present invention and one embodiment thereof.
With the front side of FIG. 2 as the front side, the curved portion on the front side is curved downward, and the curved portion on the back side is curved upward. Since the curved portion is torn halfway, the inner surface (24) of the laminated body is exposed.

FIG. 3 is a schematic explanatory view of the state of the force applied to each part when the tear progresses in FIG. It shows the change in the degree of application of the tear force in the curved portion when the tear proceeds in the direction of the arrow A with a constant tensile force indicated by the arrow (25). When the rift is near the beginning of the curve, most of the ripping force is the component (26) in the direction of ripping. On the other hand, at a position close to the end point of the curved portion, the component (27) in the direction of advancing the tear is reduced. As a result, the ripping becomes difficult to proceed, and the resistance to further ripping increases, which triggers the user to end the ripping.

FIG. 4 shows a partially enlarged portion of the packaging bag of the present invention cut along the opening line (2) to the middle of the curved portion (22) when the curved direction of the curved portion is opposite to the example of FIG. It is a partial perspective schematic diagram. When the direction of curvature is opposite, when the tear reaches the curved portion, the back side laminate rides on the front side laminate at the portion B, which becomes an obstacle and further tears occur. It will be difficult. As described above, it is possible to use it as an opportunity to end the tear regardless of the bending direction of the curved portion.

FIG. 5 is a schematic partial plan view showing different embodiments of the curved portion. It is a form in which the end point passes the latest point and is further ahead, and even in such a form, the same effect as described above can be obtained.

As a result of further diligent studies on the above-mentioned packaging bag, we have found that the object of the present invention can be satisfactorily achieved under the following conditions.
That is, as described in FIG. 1, the distance d between the nearest point of the curved portion to the right side seal portion and the right side seal portion (3) is 2 mm ≦ d.
By doing so, it was found that the tear can be stopped without reaching the right side seal.

In addition, we set the distance h between the end points of the curved portion provided on the front laminated body and the end points of the curved portion provided on the back laminated body to be 4 mm ≦ h.
By doing so, it was found that the tear can be made more stable and stopped without reaching the right side seal portion.

In addition, we set the size θ of the angle between the tangent to the curved part near the end point of the curved part and the straight part by 45 ° ≤ θ.
It was found that the tearing can be made more stable and stopped without reaching the right side seal.

The easy-opening line (2) realizes easy and reliable opening by, for example, providing a linearly fragile portion by scratch processing or utilizing the orientation of the plastic film in the laminated body. As a method of scratch processing, for example, half-cut processing by laser light irradiation with a carbon dioxide gas laser device or the like can be preferably used. The easy-opening line (2) may be configured by one line, or may be configured by a plurality of lines. The contents sealed in the packaging bag (10) can be taken out from the opening opened by the opening line (2).

The arrangement of the easy-open line (2) in the packaging bag is combined with the ease of tearing, the ease of taking out the contents, the resistance to spills due to the properties of the contents, the ease of spills, etc. It can be decided as appropriate in consideration of gender and the like.

The packaging bag according to the present invention is made of a laminate having a sealant layer on a plastic film as a base material, and FIG. 7 illustrates one embodiment of the layer structure of the laminate constituting the packaging bag according to the present invention. It is a partial cross-sectional schematic diagram for this purpose.

In the embodiment shown here, the sealant layer (36) is arranged on the inner surface side of the packaging bag. Therefore, when making a bag using this laminated body (30), the heat seal layer (36) is on the inner surface side of the packaging bag in order to perform heat sealing by stacking the sealant layers (36) facing each other. The contents are in contact with the sealant layer (36), filled in a packaging bag, and sealed.

Further, in the example shown here, a gas barrier film (33) is provided on the outer surface side of the packaging bag for the purpose of improving the storage stability when the content is food or beverage, for example. 33) is a plastic film (31) provided with a gas barrier layer (32).

Further, in the example shown here, the plastic film base material layer (35) is arranged in the middle of the laminated body (30), and the mechanical properties of the entire laminated body (30) can be affected. For example, when a stretched polyamide film is used for the plastic film base material layer (35), the laminate (30) can be provided with toughness against piercing and toughness against impact. The plastic film base material layer (35) can be laminated via the adhesive layer (34).

The laminate (30) requires a sealant layer (36) and a plastic film base material layer (35), and other layer configurations, material configurations, thicknesses, etc. are appropriately designed according to the required quality for the packaging bag and the application. can do.

(Plastic film)
The plastic film of the plastic film base material layer (35) constituting the laminate (30) is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate). , Polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polyimide, etc., and can be appropriately selected according to the required quality and application.

For example, when the stretched polyamide film is used as the plastic film base material layer (35), the laminate (30) can be provided with toughness against piercing and toughness against impact. Further, for example, when polypropylene or polyethylene terephthalate is used as the plastic film base material layer (35), it is more preferable in terms of the strength and price of the laminate (30).

(Sealant layer)
The sealant layer (36) is arranged on at least one surface of the laminate (30), and the two laminates are laminated so that the sealant layers (36) face each other, and are heated and pressurized to be heat-sealed. It adheres to each other and makes it possible to make a bag in a packaging bag (10).

As the material of the sealant layer (36), a polyolefin resin is generally used among the thermoplastic resins, specifically, low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), and linear low density resin. Ethylene-based resins such as density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, ethylene-methacrylic acid resin copolymer, blended resin of polyethylene and polybutene, and Polypropylene resins such as homopolypropylene resin (PP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer can be used.

To form the sealant layer (36), a molten resin can be formed by using an extruder or the like to form a layer on the laminated body (30). Alternatively, it is also possible to form a sealant layer (36) on the surface of the laminated body (30) by laminating a material that has been formed into a film in advance by laminating.

(Print layer)
Although not shown in FIG. 7, if necessary, it is possible to improve the image as a product and provide necessary information about the contents on the layer visible from the outer surface side of the packaging bag in the laminate (30) by printing. it can. As the base material for that purpose, a plastic film made of a polymer material can be used.

A plastic film made of a polymer material is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (
Polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polyimide, etc. can be used, and are appropriately selected according to the application. In particular, when polypropylene or polyethylene terephthalate is used as the base film, it is more preferable in terms of film strength and price.

Here, the printing method and the printing ink are not particularly limited, but among the known printing methods and printing materials, the printability on the film, the design such as the color tone, the adhesion, or the use is food. In such a case, it can be appropriately selected in consideration of safety as a food container.

For example, a gravure printing method, an offset printing method, a gravure offset printing method, a flexographic printing method, an inkjet printing method, or the like can be used. Above all, the gravure printing method can be preferably used in terms of productivity and high definition of the pattern.

(Gas barrier layer)
Further, for the purpose of improving the storage stability of the contents, if necessary, an opaque layer such as a colored film that shields ultraviolet rays can be provided in the laminated body (30). Alternatively, the gas barrier layer (32) can be provided in the laminated body (30). The example shown in FIG. 7 is an example in which a gas barrier film (33) having a gas barrier layer (32) provided on the surface of the plastic film (31) is used.

The plastic film used for the gas barrier film (33) is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide ( Nylon-6, nylon-66, etc.), polyethylene, etc. can be used, and are appropriately selected according to the application. In particular, when polypropylene or polyethylene terephthalate is used as the plastic film (31), it is more preferable in terms of film strength and price.

When cooking in a microwave oven is premised, a metal foil such as an aluminum foil or an aluminum vapor deposition layer cannot be used as the gas barrier layer. However, instead, a gas barrier film (33) provided with a gas barrier layer (32) made of an inorganic compound on the surface of the plastic film (31) can be used.

In the case of the gas barrier film (33), the gas barrier layer (32) can be composed of a vapor deposition layer of an inorganic compound, a coating layer, or both, and when composed of both, an anchor coat is applied to the plastic film (31). After the provision, the vapor deposition layer and the coating layer can be sequentially provided.

For example, urethane acrylate can be used for the anchor coat layer of the gas barrier film (33). For the formation of the anchor coat layer, a coating method in which a coating material in which a resin is dissolved in a solvent is applied by a printing method such as gravure coating can be used, or a coating film can be formed by using a generally known coating method.

As a method for forming the vapor deposition layer, an inorganic compound such as SiO or AlO may be coated on a base film provided with an anchor coat layer by a vacuum vapor deposition method to form an inorganic compound layer by the vacuum vapor deposition method. it can. The thickness of the thin-film deposition layer is preferably 15 nm to 30 nm.

As a method for forming the coating layer, an aqueous solution or water / alcohol containing at least one of a water-soluble polymer, (a) one or more alkoxides or hydrolysates thereof, or both, or (b) tin chloride. A coating agent containing a mixed aqueous solution as a main component can be applied onto a film and dried by heating to form an inorganic compound layer by a coating method to form a coating layer. At this time, by adding a silane monomer to the coating agent, it is possible to improve the adhesion with the anchor coat layer.

The inorganic compound layer has a gas barrier property only by the coating film by the vacuum vapor deposition method, but the coating layer which is the inorganic compound layer by the coating method is formed by superimposing on the vapor deposition layer which is the inorganic compound layer by the vacuum vapor deposition method to form a gas barrier layer. be able to.

By combining these two layers, a reaction layer of both layers is formed at the interface between the inorganic compound layer by the vacuum vapor deposition method and the inorganic compound layer by the coating method, or the inorganic compound layer by the coating method becomes an inorganic compound layer by the vacuum vapor deposition method. By filling and reinforcing defects such as pinholes, cracks, and grain boundaries or micropores that occur, a dense structure is formed, which realizes high gas barrier properties, moisture resistance, and water resistance, and is flexible enough to withstand deformation. Since it has a property, it can also be suitable as a packaging bag.

Further, when SiO is used as the gas barrier layer (32), for example, the coating film is transparent, so that the contents can be visually seen from the outside of the packaging bag. These may be used properly according to the application and the required quality.

Further, since no metal foil is used as the gas barrier layer (32), it is suitable for heating by a microwave oven and has an advantage in the stability of the container shape when the packaging bag is pushed from the outside and used.

(Adhesive layer)
When laminating each layer constituting the laminated body (30), it can be laminated via the adhesive layer (34). As the material of the adhesive, for example, polyester-isocyanate type resin, urethane resin, polyether resin and the like can be used.

Further, as a laminating method, a method such as dry lamination or non-solvent lamination can be used. Alternatively, when a thermoplastic resin is used, a laminate or a layer can be formed using an extruder.

Hereinafter, the present invention will be further specifically described with reference to FIG. However, the present invention is not limited to the examples shown here.

<Example 1>
A test piece of a packaging bag provided with an opening line (2) having the form shown in FIG. 1 was prepared under the following conditions.
d = 5 mm
The layer structure of the laminate used for the three-condition packaging bag with four conditions θ = 30 °, 45 °, and 60 ° of h = 1 mm, 4 mm, 7 mm, and 10 mm is as follows from the outer surface of the packaging bag.
Biaxially stretched polypropylene film (thickness 20 μm) /
Polyethylene terephthalate film (thickness 12 μm) /
Polyethylene resin sealant layer (thickness 40 μm)

The test piece was torn from the left side with fingers, and the progress of the tear was confirmed. The evaluation criteria are as follows.
〇: The tear stopped without reaching the right side seal in all specimens.
Δ: The effect of stopping the tearing was confirmed, but fragments were cut off in some of the test specimens.
X: The tear reached the right seal in all specimens and the fragments were separated.

The results are summarized in Table 1.

With the packaging bag configured under the above conditions, the effect of stopping tearing was obtained. However, when h = 1 mm, the result was unstable.

<Example 2>
A test body similar to that of Example 1 was prepared except for the conditions shown below, and evaluation was performed using the same method and evaluation criteria.
d = 2mm

The results are summarized in Table 2.

With the packaging bag configured under the above conditions, the effect of stopping tearing was obtained. However, when h = 1 mm and when θ = 30 °, the result was unstable.

<Comparative example 1>
A test body similar to that of Example 1 was prepared except for the conditions shown below, and evaluation was performed using the same method and evaluation criteria.
d = 1 mm

The results are summarized in Table 3.

In the packaging bag configured under the above conditions, the tearing could not be stopped and the fragments were separated. When h = 4 mm, the result was unstable.

As a result of the above, it was found that when d = 1 mm, the effect of stopping the tear cannot be obtained, or only an unstable result can be obtained.

1 ... Notch 2 ... Easy opening line 3 ... Right side heat seal part 4 ... Left side heat seal part 5 ... Top heat seal part 6 ... Bottom heat seal part 10 ...・ Packaging bag 21 ・ ・ ・ Straight part 22 ・ ・ ・ Curved part 24 ・ ・ ・ Inner surface 25 of laminated body ・ ・ ・ Tension force 26 ・ ・ ・ Tearing force component 27 ・ ・ ・ Tearing force component 30 ・ ・ ・ Laminated body 31 ... Plastic film 32 ... Gas barrier layer 33 ... Gas barrier film 34 ... Adhesive layer 35 ... Plastic film base material layer 36 ... Sealant layer

Claims (3)

A packaging bag in which a base material and a sealant layer of a laminate having at least a sealant layer are opposed to each other to seal the peripheral portion.
The laminated bodies on the front side and the back side of the packaging bag are provided with easy-opening lines by scratch processing, respectively, and the easy-opening lines are abbreviated as the laminated bodies on the front side and the back side from one side edge portion toward the opposite side edge portion. A straight portion that extends linearly at the same position, and a front and back laminate that smoothly extends from the end of the straight portion to the end point in the direction of the opposite side edge , curved in opposite directions. Consists of curved parts
The angle between the tangent to the easy-open line and the straight part in the curved part increases as it approaches the end point.
During the opening, the inner surface of the laminate was exposed.
A packaging bag characterized in that the following equation (1) is satisfied, where d is the distance between the nearest point from the peripheral edge of the curved portion and the sealed region of the peripheral edge.
2 mm ≤ d ... Equation (1) The packaging bag according to claim 1, wherein the following formula (2) is satisfied, where h is the distance between the end points of the laminated body on the front side and the back side.
4 mm ≤ h ・ ・ ・ Equation (2) The packaging bag according to claim 1 or 2, wherein the following equation (3) is satisfied, where θ is the size of the angle formed by the tangent line and the straight line portion in the vicinity of the end point of the curved portion.
45 ° ≤ θ ・ ・ ・ Equation (3)

Images