JP2021050021A - Packaging material and package - Google Patents

Abstract

To provide a packaging material that is easy to open, has a good appearance, and is not likely to be torn by being caught in a fragile processed part during transportation.SOLUTION: The packaging material composed of a laminate consisting of an outermost layer, an intermediate layer, and an innermost layer has a portion having a high absorption rate of a laser beam only in the intermediate layer, in which a fragile processed part is formed only in the portion having the high absorption rate of the laser beam in the intermediate layer due to the laser beam emitted from the outermost layer or the inner layer side.SELECTED DRAWING: Figure 1

Description

The present invention relates to a package having easy-to-open properties and a packaging material used therein.

In a bag or the like using a packaging material composed of a laminate containing plastic, in addition to the protection of the contents, the easy-opening property for easily opening the bag or the like is required. In order to impart this easy-opening property, conventionally, there is a bag or the like using a fragile processed portion provided by half-cutting a film in a solid line shape or a broken line shape starting from a notch at an end portion.

For example, in Patent Document 1, in a packaging bag in which the peripheral edges of two stacked sheets are sealed to form a storage portion inside, one of the two sheets has a perforated shape that crosses the storage portion. A row or a plurality of cut lines are formed on the surface of the sheet, and a large number of cuts are formed on the other sheet at a position overlapping the cut lines so that the cut lines can be broken within a predetermined width wider than the width of the cut lines. A packaging bag, characterized in that a breaking line is formed intermittently on the surface of the sheet along the cut line, has been proposed.

According to the above invention, the break line formed on one sheet and the cut line formed on the other sheet within the predetermined width are overlapped with each other, so that when tearing the bag, the break line and the break line are surely aligned. Can be broken.

However, the formation of so-called fragile processed parts such as cut lines and break lines on the surface of the packaging bag not only makes the fragile processed part visible from the outside of the packaging bag, but also scratches the surface of the packaging bag. There is a possibility that a step may be formed, and there is a problem of poor appearance. In addition, the packaging bag may be torn and opened during transportation by being caught in a fragile processed portion on the surface of the packaging bag during transportation.

Japanese Unexamined Patent Publication No. 2004-98363

In view of the above problems, it is an object of the present invention to provide a packaging material which has a good appearance and is not likely to be torn by being caught in a fragile processed portion during transportation while maintaining easy opening. To do.

The invention according to claim 1 is a packaging material composed of a laminate composed of an outermost layer, an intermediate layer, and an innermost layer, wherein only the intermediate layer has a portion having a high laser light absorption rate. The packaging material is characterized in that a fragile processed portion is formed only in a portion of the intermediate layer having a high absorption rate of the laser light by the laser light emitted from the outermost layer side or the innermost layer side.

The invention according to claim 2 is a packaging material, wherein the thickness of a portion of the intermediate layer having a high laser light absorption rate is 13% or more and 18% or less of the entire laminate.

According to the third aspect of the present invention, the fragile processed portion is formed so as to be between the push-open portions at both ends and the push-open portions at both ends and in contact with each of the push-open portions at both ends. Was done
The packaging material according to claim 1 or 2, wherein the packaging material is composed of a linear cut line.

In the invention according to claim 4, the fragile processed portion is composed of a tear prevention portion at both ends and a linear breakthrough portion located between the tear prevention portions at both ends, and the linear breakthrough portion is formed. The portion is characterized in that both ends of the linear breakthrough portion are formed so as to face each of the tear prevention portions of the both end portions and not to be in contact with each of the tear prevention portions of the both end portions. The packaging material according to claim 1 or 2.

In the invention according to claim 5, the fragile processed portion is formed by forming a set of a bent cut line and a linear guide portion in a straight line, and the linear guide portion is formed with a cut portion. The bent cut line is composed of a non-cut portion, and the bent cut line is a diagonal line portion inclined downward to the right from the upper left side of the linear guide portion to the linear guide portion side, and a lower left portion of the linear guide portion. It is composed of a diagonal line portion inclined to the upper right from the side to the linear guide portion side, and has a bent portion by connecting them, and a cut portion of the linear guide portion so as to be in contact with the right side of the bent portion. The packaging material according to claim 1 or 2, wherein the packaging material is formed.

The invention according to claim 6 is a package obtained by sealing and packaging the contents using the packaging material according to any one of claims 1 to 5.

In the present invention, in a packaging material composed of a laminate composed of an outermost layer, an intermediate layer, and an innermost layer, only the intermediate layer has a portion having a high absorption rate of laser light. By irradiating this laminated body with laser light, a fragile processed portion is formed only in the intermediate layer. Therefore, while maintaining easy opening, the fragile processed portion, which is a scratch, cannot be seen on the surface of the packaging material, so that the appearance is good and there is no possibility that the fragile processed portion will be caught in the fragile processed portion and the packaging material will be torn during transportation. ..

It is a figure which showed the case where the fragile processed part was formed by the laser beam in the laminated body which comprises the packaging material which concerns on this invention, and showed the cross-sectional schematic diagram of the laminated body. It is a perspective view which shows the 1st Embodiment of the packaging material which concerns on this invention. It is a perspective view which shows the 1st Embodiment of the package which concerns on this invention. (A) It is a top view which shows the 1st Embodiment of the fragile processed part of the shape which is pushed open and is guided to be cut in a straight line. (B) It is a top view which shows the 2nd Embodiment of the fragile processed part of the shape which is pushed open and is guided to be cut in a straight line. (A) It is a top view which shows the 1st Embodiment of a fragile machined part, which has a shape which breaks through and prevents the scratching of the end part of a fragile machined part from spreading. (B) It is a top view which shows the 2nd Embodiment of the fragile processed part of the shape which breaks through and prevents the scratch processing of the end part of a fragile processed part from spreading. (A) It is a top view which shows the 1st Embodiment of the fragile processed part of the shape which breaks through and is guided to be cut in a straight line. (B) It is an enlarged view of a set of continuous composite cut lines in FIG. 6 (a).

Hereinafter, examples of embodiments of the packaging material 1 or the packaging body 20 according to the present invention will be described with reference to the drawings as necessary.

FIG. 1 is a diagram showing a case where a fragile processed portion 3 is formed by a laser beam 2 on a laminate constituting the packaging material 1 according to the present invention, in a schematic cross-sectional view of the laminate. Here, the outermost layer and the innermost layer are layers that can be seen from the outside of the packaging material 1, and the intermediate layer is a layer that cannot be seen from the outside of the packaging material 1 other than the outermost layer and the innermost layer. Examples of the layer laminated on the laminate constituting the packaging material 1 of the present invention include a base material layer 31 as an outermost layer, an intermediate layer 32, and a sealant layer 33 as an innermost layer. In FIG. 1, the fragile processed portion 3 is formed by irradiating the laser light 2 from the base material layer 31 side, but the laser light 2 is not from the base material layer 31 but from the innermost sealant layer 33 side. May be irradiated to form the fragile processed portion 3. Only the intermediate layer 32 has a portion having a high absorption rate of the laser light 2 so that only the intermediate layer 32 is burnt off by the laser light 2. The thickness of the portion of the intermediate layer 32 having a high absorption rate of the laser light 2 is preferably 13% or more and 18% or less of the entire laminated body in order to further improve the ease of opening. (In FIG. 1, as an example, since the entire intermediate layer 32 is a portion having a high absorption rate of the laser light 2, the fragile processed portion 3 is formed in the entire depth of the intermediate layer 32.)

The materials used for each of the above layers are as follows in consideration of the absorption rate of the laser light 2. If the fragile processed portion 3 can be formed only in the intermediate layer 32, the number of each of the above layers is not limited, and the configuration of the laminate constituting the packaging material 1 is also not limited.

As the base material layer 31, a film having a low absorption rate of the laser beam 2 is used.

For example, it may be a biaxially stretched polypropylene (OPP) film, cellophane, or a composite film in which two or more films thereof are laminated.

The thickness of the base material layer 31 is preferably 25% or more and 33% or less of the entire laminated body in consideration of processability. Known additives such as antistatic agents, ultraviolet absorbers, plasticizers, lubricants, and colorants can be added to the base material layer 31, and are appropriately added as needed. Further, it is also possible to perform surface modification such as corona discharge treatment and anchor coating treatment on the surface of the base material layer 31 to improve the adhesiveness and printability with the intermediate layer 32 and the like, which will be described later. Further, in the case where the intermediate layer 32 is imparted with the barrier property by using the film having the barrier property for the base material layer 31, even if the fragile processed portion 3 is formed in the intermediate layer 32, the entire laminated body is formed. It is possible to provide a packaging material 1 having an excellent barrier property without lowering the barrier property.

Further, a printing layer can be formed on the front surface or the back surface of the base material layer 31 as needed. The printing layer can be formed on either the front or the back surface of the base material layer 31, but the base material layer 31 can be formed in consideration of the abrasion resistance, weather resistance, etc. of the ink as in the case of printing on a general plastic film. It is preferable to provide the inner surface of the above surface by a gravure printing method or the like.

In order to form the fragile processed portion 3 only in the intermediate layer 32, a film having a high absorption rate of the laser light 2 is used only in the intermediate layer 32.

For example, polyesters such as polyethylene terephthalate (PET), polyethylene terephthalate (PEN) and polybutylene terephthalate (PBT), polyolefins such as polyethylene (PE) and polypropylene (PP), and polyamides such as nylon-6 and nylon-66. Stretched or unstretched resins such as (PA), polypropylene (PC), polyacrylonitrile (PAN), polyimide (PI), polyvinyl alcohol (PVA), polyvinylidene chloride (PVDC), ethylene-vinyl alcohol copolymer (EVOH) Films, nylon 6 / metaxylylene diamine nylon 6 co-extruded films, polypropylene / polyethylene-vinyl alcohol copolymer co-extruded films and the like can be used. Alternatively, it may be a composite film in which two or more of these films are laminated. Further, a gas barrier film or the like on which an inorganic oxide is vapor-deposited can be used.

Functions of the intermediate layer 32 include, for example, gas barrier resistance, bending resistance, cold resistance, chemical resistance, mechanical toughness, piercing resistance, impact resistance, wear resistance, heat resistance, and the like. However, the portion of the intermediate layer 32 having a high absorption rate of the laser light 2 needs to be burnt off by irradiating the laser light 2, and has mechanical toughness, puncture resistance, and impact resistance. , Abrasion resistance, heat resistance and other functions are added.

Further, the thickness of the portion of the intermediate layer 32 having a high absorption rate of the laser light 2 is preferably 13% or more and 18% or less of the entire laminated body in order to further improve the ease of opening.

The sealant layer 33 uses a film having a low absorption rate of the laser beam 2.

For example, polyethylene (PE), unstretched polypropylene (CPP), low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), high density polyethylene resin (HDPE), linear low density polyethylene resin (L-LDPE). , Polypropylene resin (PP), ethylene-propylene copolymer (EP), ethylene-α-olefin copolymer and other resins, or a film formed by forming these resins can be used. Alternatively, it may be a composite film in which two or more of these films are laminated.

Further, the thickness of the sealant layer 33 is preferably 10% or more and 80% or less of the entire laminated body in consideration of the seal strength, physical characteristics, and processability.

As a method of laminating the base material layer 31 which is the outermost layer, the intermediate layer 32, and the sealant layer 33 which is the innermost layer, for example, a sandwich using a dry lamination method, an extrusion lamination method, and an extrusion lamination method. A known method such as the lamination method can be used.

As the adhesive used in the dry lamination method, a polyurethane-based adhesive, a polyacrylic-based adhesive, a polyester-based adhesive, an epoxy-based adhesive, a polyvinyl acetate-based adhesive, a cellulose-based adhesive, or the like can be generally used.

As described above, by using a material having a high absorption rate of the laser light 2 only for the intermediate layer 32 and using a material having a low absorption rate of the laser light 2 for the outermost layer and the innermost layer, as shown in FIG. 1, the outermost layer side. Even if the laser beam 2 is irradiated from the surface, the outermost layer and the innermost layer are not affected, and only the intermediate layer 32 is selectively burnt off, so that a half-cut fragile processed portion 3 can be provided. ..

In the packaging material 1 according to the present invention shown in FIG. 1, when forming the fragile processed portion 35 by irradiation with the laser beam 2, a single intermediate layer 32, two layers including the outermost base material layer 31, or two layers including the outermost base material layer 31 are used. It may be formed in any of the three layers including the sealant layer 33, which is the innermost layer. Further, when carbon dioxide laser light is used, it is also possible to form the package 20 in the state of using the laminated body. As described above, the formation of the fragile processed portion 3 by the irradiation of the laser beam 2 may be performed before or after the innermost layer and the outermost layer are bonded, but the alignment is easier and more complicated after the bonding. It is possible to stably provide the fragile processing portion 3 without requiring a process. When the fragile machined portion 3 is formed only in the intermediate layer 32 by the cutting tool, it is necessary to form the fragile machined portion 3 in the intermediate layer 32 in advance before laminating the outermost layer and the innermost layer. In that sense as well, it is better to use the laser beam 2 than the blade.

Since the fragile processed portion 3 is formed only in the intermediate layer 32, the fragile processed portion 3 is not visible from the outside of the packaging material 1 and has a good appearance. In addition, the portion cut out as the fragile processing portion 3 is sandwiched between the outermost layer and the innermost layer to form a protected shape, and before the consumer purchases and opens the product, such as during transportation or over-the-counter sales. There is no risk of the packaging material 1 being torn by being caught in the fragile processing portion 3.

As described above, in the packaging material 1 according to the present invention, the fragile processed portion 3 does not appear on the surface. Therefore, when the packaging body 20 using the packaging material 1 according to the present invention is opened, the fragile processed portion 3 is usually used. Open the package by pressing it strongly with your finger or piercing it. Further, since the fragile processed portion 3 does not appear on the surface as described above, it is conceivable to print the fragile processed portion 3 on the surface of the package 20 so that the portion to be opened in which the fragile processed portion 3 is formed can be seen.

FIG. 2 is a perspective view showing a first embodiment of the packaging material 1 according to the present invention. FIG. 2 shows a storage body 21 composed of a container main body 23 in which an air freshener or the like is stored and a lid portion 22 thereof. The material and form of the container body 23 are not particularly limited, and when the packaging material 1 according to the present invention is used as the lid portion 22, the contents are sealed together with the lid portion 22 to protect the contents. It just needs to be suitable. Further, the shape of the lid portion 22 is not particularly limited, and it is sufficient that the contents are sealed together with the container body 23 and are suitable for the protection of the contents. A fragile processed portion 3 for opening is provided in a part of the lid portion 22, and the entire fragile processed portion 3 overlaps the portion of the intermediate layer 32 having a high absorption rate of the laser light 2. Since the fragile processed portion 3 does not appear on the surface, the portion to be opened is printed on the surface of the lid portion 22 so that the portion to be opened in which the fragile processed portion 3 is formed can be known.

In FIG. 2, when the fragile processed portion 3 is provided on the lid portion 22 of the storage body 21 for containing an air freshener or the like, the fragile processed portion 3 is strongly pushed to pierce and break. The shape of the fragile machined portion 3 shown in FIG. 2 is provided as an example in the shape shown in FIG. 5A, which will be described later. As described above, when the packaging material 1 according to the present invention is used as the lid portion 22, a hard and thick material is usually used. Therefore, here, as an example, it is shown as a form of strongly pressing to pierce and tear.

The packaging material 1 in the form shown in FIG. 2 is a deodorant, a deodorant, a deodorant, an insect repellent, an insecticide, and an antibacterial agent, which are also volatile liquids, in addition to the lid of the container for storing the air freshener. , Can also be used as a lid of a container for accommodating a disinfectant or the like.

FIG. 3 is a perspective view showing a first embodiment of the package 20 according to the present invention. FIG. 3 is a packaging bag 24 containing snacks and the like. The packaging bag 24 may be any of a three-sided seal bag, a four-sided seal bag, a pillow bag, a gusset bag, and a self-supporting packaging bag. A fragile processed portion 3 for opening is provided in a part of the front member 25 constituting these packaging bags 24, and the entire fragile processed portion 3 has a high absorption rate of the laser light 2 of the intermediate layer 32. It overlaps the part. Since the fragile processed portion 3 does not appear on the surface, the portion to be opened is printed on the surface of the bag so that the portion to be opened in which the fragile processed portion 3 is formed can be known.

In FIG. 3, after the fragile processing portion 3 provided in the snack food packaging bag 24 is pushed and opened, the cut is easily guided along the linear cut line. The shape of the fragile machined portion 3 shown in FIG. 3 is provided as an example in the shape of FIG. 4A, which will be described later. In the case of guiding the opening, if the fragile processed portion 3 is provided at a position intersecting the stretching direction of the film, it is usually difficult to open. It is preferable to adjust the forming direction of the fragile processed portion 3 in accordance with the material of each layer and the thickness of the fragile processed portion 3.

The packaging body 20 in the form shown in FIG. 3 can be used as a packaging bag for small industrial parts (bolts, nuts, etc.) in addition to the packaging bag for snack foods.

Regarding the position where the fragile processed portion 3 is formed in the package 20 including the above, for example, in the case of a bag shape as shown in FIG. 3, a portion to be heat-sealed to form the laminated body in a bag shape. Any part different from the above may be used. The package 20 in other forms can also be formed at an arbitrary position in consideration of easy opening, the type of contents, the filling process, and the like. Further, in the lid portion 22 shown in FIG. 2 and the packaging bag 24 shown in FIG. 3, the fragile processed portion 3 is formed at one place, but the fragile processed portion 3 may be formed at a plurality of places.

The laser beam 2 used to form the fragile machined portion 3 will be described in detail below.

The advantages of using laser light 2 are 1) non-contact processing, 2) fine processing, 3) dry process, 4) fast processing speed, and 5) easy automation. Can be mentioned.

Further, when the fragile machined portion 3 is formed only in the intermediate layer 32 by using a blade instead of the laser beam 2, the fragile machined portion 3 is formed in advance in the intermediate layer 32 before laminating the outermost layer and the innermost layer. There is a lot of work to do. Further, the adhesive from the fragile processed portion 3 in the intermediate layer 32 exudes before laminating the outermost layer and the innermost layer, which may adhere to the contents and the surface of the packaging bag, which may cause a hygiene problem. Further, it was found that once the fragile processed portion 3 is formed in the intermediate layer 32 and sandwiched between the outermost layer and the innermost layer, it is difficult to open the package due to insufficient fragile processing after the package 20 is formed. However, there is a problem that opening assistance cannot be provided later. Further, due to the swelling of the fragile processed portion 3 in the intermediate layer 32 due to the burr of the blade, the outermost layer is also swelled, and there is a problem of poor appearance.

The absorption rate of the laser light 2 differs depending on the material to be irradiated, and the higher the absorption rate of the material, the less the scattering or reflection and transmission of the irradiated laser light 2, and the more efficiently the laser light 2 is burnt off. To contribute.

When carbon dioxide laser light is used as the laser light 2, for example, a resin layer having a carbonyl group represented by a C = O double bond can be burnt off. As described above, in the packaging material 1 in the present invention, only the intermediate layer 32 is selectively burnt off. Therefore, for example, the intermediate layer 32 uses polypropylene terephthalate (PET) in which a C = O double bond is used, and the outermost base material layer 31 has a C = O double bond. It is assumed that a non-biaxially stretched polypropylene film (OPP) is used, and polyethylene (PE) having no C = O double bond is used for the sealant layer 33, which is the innermost layer. In this case, the biaxially stretched polypropylene film (OPP) of the base material layer 31 and the polyethylene (PE) of the sealant layer 33 hardly absorb the laser beam 2 and are almost intact.

As the laser light 2, the film is burnt off for the fragile processing portion 3 using carbon dioxide laser light, so that even after the film is formed in the state of the packaging body 20 such as a packaging bag, one of the packaging materials 1 The burn-off process can be easily applied only to the layer of the portion. However, as the laser light 2, in addition to the carbon dioxide gas laser, a gas laser such as a nitrogen laser, a solid-state laser such as a ruby laser, and a YAG laser can also be used.

Further, in addition to the absorption rate of the laser light 2 in the material used for each layer, the degree of burn-out processing can be adjusted by the output energy of the laser light 2, the irradiation time, the scan speed, and the like. If the scan speed is slow, the processing degree of the fragile processing part 3 is good, but the fragile processing part 3 becomes a little more noticeable. On the contrary, if the scan speed is high, the processing degree of the fragile processing part 3 becomes a little worse, but the fragile processing part 3 is conspicuous. It becomes difficult. Therefore, when it is desired to perform a burn-off process on a part of the intermediate layer 32, the intermediate layer 32 in which a plurality of materials having different absorption rates of the laser light 2 are laminated may be used, and the above method may also be used. Good.

(About the shape of the fragile processing part 3)
FIG. 4A is a plan view showing a first embodiment of the fragile machined portion 3 having a shape that is pushed open and guided to be cut in a straight line. FIG. 4B is a plan view showing a second embodiment of the fragile machined portion 3 having a shape that is pushed open and guided to be cut in a straight line.

The fragile processing portion 3 shown in FIG. 4 is formed in a shape for opening the package 20 according to the present invention by pushing it open and inducing it to be cut in a straight line. As shown in FIG. 4, the push-open portions 4 at both ends and the linear cut line 5 formed so as to be connected to the push-open portions 4 at both ends are formed. The linear cut line 5 is formed between the push-open portions 4 at both ends and in contact with each of the push-open portions 4 at both ends. The linear cut line 5 is preferably a solid line in consideration of hand cutting inducibility. Here, "contacting each of the push-open portions 4 at both ends" means that the push-open portions 4 at both ends do not reach each other (do not penetrate) and the push-open portions 4 at both ends. Includes both cases of intersecting (penetrating) after reaching each.

FIG. 4A is an embodiment of the shape of the fragile machined portion 3 having the above-described configuration. A fold-out portion, which is an arc-shaped cut line that swells in an arc shape, is formed on the left side, and a linear cut-off line 5 is formed so as to connect the push-open portions 4 at both ends thereof. The push-open portion 4 at the left end and the push-open portion 4 at the right end are located at the center of the linear cut line 5, and are formed symmetrically with respect to a virtual right angle line (not shown) with respect to the linear cut line 5. Will be done. Further, the push-open portions 4 at both ends are formed vertically symmetrically with respect to the linear cut line 5. When opening the package 20 from the fragile processing portion 3 having this shape, the place to be pressed with a finger at the beginning of opening is in one of the circles when the left and right arc-shaped cut lines are circles, and is linear. At the end where the opening is guided in a straight line by the cut line 5, the other push-open portion 4 is reached.

The arc-shaped cut line is preferably a fan-shaped arc shape cut at an angle larger than 180 degrees from the center point of the arc-shaped cut line as a circle. A part of the cut line of the arc that exceeds 180 degrees becomes a barb portion 6 of the so-called break-prevention on the push-open portion. The tear-preventing barb 6 on the push-open portion prevents the film from tearing more than necessary when the film is opened, and there is no problem such as poor appearance.

FIG. 4 (b) shows that the fragile machined portion 3 shown in FIG. 4 (b) has a different shape of the push-open portion 4 from that of FIG. 4 (a). The push-open portion 4 on the left end side has a diagonal cut line inclined downward to the right from the upper left side of the straight cut line 5 to the linear cut line 5 side, and a linear cut from the lower left side of the straight cut line 5. A diagonal cut line inclined to the upper right toward the line 5 side, and an anti-tear barb on the push-open portion attached to the end opposite to the linear cut line 5 of each of the diagonal cut lines. It is composed of 6. The diagonal cut lines on the left end side do not intersect with each other, and each reaches the linear cut line 5. The push-open portion 4 on the right end side has a diagonal cut line inclined to the lower left from the upper right side of the straight cut line 5 to the linear cut line 5 side, and a linear cut from the lower right side of the straight cut line 5. A diagonal cut line inclined to the upper left toward the line 5 side, and an anti-tear barb on the push-open portion attached to the end opposite to the linear cut line 5 of each of the diagonal cut lines. It is composed of a push-open portion 4 on the right side, which is composed of 6. The diagonal cut lines on the right end side do not intersect with each other, and each reaches the linear cut line 5. Here, the tear-preventing barb 6 on the push-open portion is a line extending from the end opposite to the linear cut line 5 of each diagonal cut line of the push-open portion 4, and is a linear cut line 5. It is a line approximately perpendicular to. The tear-prevention barbs 6 on the push-open portion are not connected to each other.

A linear cut line 5 is formed so as to connect the push-open portions 4 at both ends. Further, the push-open portion 4 at the left end portion and the push-open portion 4 at the right end portion are located at the center of the linear cut line 5, and are symmetrical with respect to the virtual right angle line (not shown) with respect to the linear cut line 5. Is formed in. Further, the push-open portions 4 at both ends are formed vertically symmetrically with respect to the linear cut line 5. When opening the package 20 from the fragile processing portion 3 having this shape, the place to be pressed with a finger at the beginning of opening is between the two diagonal cut lines on the left and right, and the opening is linearized by the linear cut line 5. At the end guided by, it reaches the other push-opening portion 4. Further, the tear-preventing barbs 6 on the push-open portions at both ends prevent the film from tearing more than necessary at the time of opening, and there is no problem such as poor appearance.

FIG. 5A is a plan view showing a first embodiment of the fragile processing portion 3 having a shape that breaks through and prevents the scratch processing at the end portion of the fragile processing portion 3 from spreading. FIG. 5B is a plan view showing a second embodiment of the fragile processing portion 3 having a shape that breaks through and prevents the scratch processing at the end portion of the fragile processing portion 3 from spreading.

The fragile processed portion 3 shown in FIG. 5 has a shape for opening the package 20 according to the present invention while preventing the fragile processed portion 3 from being scratched and being torn more than necessary. It is formed by. As shown in FIG. 5, the fragile processing portion 3 is composed of a tear prevention portion 8 at both ends and a linear breakthrough portion 7 located between the tear prevention portions 8 at both ends. In the linear breakthrough portion 7, both ends of the linear breakthrough portion 7 face toward the tear prevention portions 8 at both ends thereof, and the both ends of the linear breakthrough portion 7 do not touch each of the tear prevention portions 8 at both ends. It is formed like this. That is, as shown in FIG. 5, when the tear prevention portion 8 is positioned on the left and right, the linear breakthrough portion 7 is formed in a straight line extending to the left and right between them. Further, the linear breakthrough portion 7 is preferably a solid line in consideration of hand-cutting inducibility.

FIG. 5A is an embodiment of the shape of the fragile machined portion 3 having the above-described configuration. A tear prevention portion 8 which is an arcuate cut line that swells in an arc shape is formed on the right side, and a linear breakthrough portion 7 is formed between the tear prevention portions 8 at both ends. The tear prevention portion 8 at the left end and the tear prevention portion 8 at the right end are located at the center of the linear breakthrough portion 7, and are left and right with respect to a virtual right angle line (not shown) with respect to the linear breakthrough portion 7. It is formed symmetrically. Further, the tear prevention portions 8 at both ends are formed vertically symmetrically with respect to the linear breakthrough portions 7. When opening the package 20 from the fragile processing portion 3 having this shape, the place to be pierced with a finger at the beginning of opening is preferably the center of the linear piercing portion 7, and the linear piercing portion 7 guides the opening linearly. The tear prevention portions 8 at both ends prevent the scratch processing at the ends of the fragile processing portion 3 from spreading and tearing more than necessary.

The fragile machined portion 3 shown in FIG. 5 (b) has a different shape of the tear prevention portion 8 from that of FIG. 5 (a). The tear prevention portion 8 on the left end side has a diagonal cut line inclined downward to the left from the upper right side of the linear breakthrough portion 7 to the linear breakthrough portion 7 side, and from the lower right side of the linear breakthrough portion 7. A diagonal cut line inclined to the upper left toward the linear breakthrough portion 7 side, and a tear-prevention barb 9 on the tear prevention portion attached to the end of each of the diagonal lines on the linear breakthrough portion 7 side. Consists of. The diagonal lines on the left end side are connected without intersecting each other. The tear prevention portion 8 on the right end side has a diagonal cut line inclined downward to the right from the upper left side of the linear breakthrough portion 7 to the linear breakthrough portion 7 side, and from the lower left side of the linear breakthrough portion 7. A diagonal cut line inclined to the upper right toward the linear breakthrough portion 7 and a tear stopper on the tear prevention portion attached to the end of each of the diagonal breakthrough lines on the straight breakthrough portion 7 side. It is composed of a barb portion 9. The diagonal cut lines on the right end side are connected without intersecting each other. Here, the tear-preventing barb 9 on the tear-preventing portion is a line extending from the end opposite to the linear break-through portion 7 of each diagonal cut line of the push-open portion 4, and is a linear break-through. It is a line substantially perpendicular to the portion 7. The tear-preventing barbs 9 on the tear-prevention section are not connected to each other.

A linear breakthrough portion 7 is formed between the tear prevention portions 8 at both ends. Further, the tear prevention portion 8 at the left end portion and the tear prevention portion 8 at the right end portion are located at the center of the linear breakthrough portion 7, with respect to a virtual right angle line (not shown) with respect to the linear breakthrough portion 7. Is formed symmetrically. Further, the tear prevention portions 8 at both ends are formed vertically symmetrically with respect to the linear breakthrough portions 7. When opening the package 20 from the fragile processing portion 3 having this shape, the place to be pierced with a finger at the beginning of opening is preferably the center of the linear piercing portion 7, and the linear piercing portion 7 guides the opening linearly. The tear prevention portions 8 at both ends and the tear-prevention barb portion 9 on the tear prevention portion prevent the scratch processing at the end portion of the fragile processing portion 3 from spreading and tearing more than necessary, resulting in poor appearance, etc. There is no problem.

FIG. 6A is a plan view showing a first embodiment of the fragile machined portion 3 having a shape that is guided to break through and be cut in a straight line. FIG. 6B is an enlarged view of a set of continuous composite cut lines 12 in FIG. 6A.

The fragile processed portion 3 shown in FIG. 6 is formed in a shape for opening the package 20 according to the present invention by being guided to break through and be cut in a straight line. As shown in FIG. 6, a set of a bent cut line 10 and a linear guide portion 11 (hereinafter referred to as a composite cut line 12) is linearly continuous. Specifically, the linear guide portion 11 includes a cut portion and a non-cut portion. The bent cut line 10 includes a diagonal line portion inclined to the lower right from the upper left side of the linear guide portion 11 to the linear guide portion 11 side, and a linear guide portion from the lower left side of the linear guide portion 11. It is composed of a diagonal line portion inclined to the upper right on the 11 side, and by connecting the ends of the two diagonal line portions on the 11 side of the linear guide portion, one so-called bent cut line bent to the right side. 10 is formed. A cut portion of the linear guide portion 11 is formed connected to the right side of the bent portion of the bent cut line 10, and a non-linear guide portion 11 is formed on the right side of the cut portion of the linear guide portion 11. A cut is formed. The portion where the bent cut line 10 and the cut portion of the linear guide portion 11 on the right side of the cut line 10 meet is the breakthrough portion 13. One fragile machined portion 3 is formed by the combination of the bent cut line 10 and the cut portion / non-cut portion of the linear guide portion 11 on the right side thereof in a straight line.

When opening the package 20 from the fragile processed portion 3 having this shape, when the place to be pierced with a finger at the beginning of opening is, for example, the center of the fragile processed portion 3, the film is pierced by the piercing portion 13 and then continuously. It breaks so as to be connected to the composite cut line 12. Even after reaching the non-cut portion of the linear guide portion 11, the cut is approaching the cut which is the shaded portion on the upper right or lower right, so that it is difficult to come off from the fragile machined portion 3. The length of each diagonal line portion forming the bent cut line 10 and the cut portion of the linear guide portion 11 is not limited. The longer the cut portion of the linear guide portion 11, the better the linearity.

The overall shape of each of the above-mentioned fragile processed portions 3 may be a shape that is easy to open according to the shape of the package 20 and the like, and may be not only left and right but also up and down or diagonally (the angle is not limited). ..

Hereinafter, specific examples of the packaging material according to the present invention will be described. In both Example 1 and Comparative Example 1 below, the conditions of the laser light irradiating the laminate are the same, a carbon dioxide laser light irradiator (3-Axis manufactured by Keyence Co., Ltd.) is used, the output is 80%, and the scanner. Laser irradiation was performed at a speed of 1600 mm / sec to form a linear fragile machined portion of 40 mm × 0.2 mm.

<Example 1>
In the laminated body constituting the packaging material used, the outermost base layer is a biaxially stretched polypropylene (OPP) film 20 μm having a low absorption rate of carbon dioxide laser light, and the intermediate layer is an absorption rate of carbon dioxide laser light. The high polyethylene terephthalate (PET) is 12 μm, and the innermost sealant layer is 40 μm of polyethylene (PE) having a low absorption rate of carbon dioxide laser light.

<Comparative example 1>
The laminate used to compose the packaging material has a base material layer of nylon (NY) 15 μm, which has a high absorption rate of carbon dioxide laser light, and an intermediate layer of polyethylene terephthalate (PET) 12 μm, which has a high absorption rate of carbon dioxide laser light. The sealant layer is 50 μm of polyethylene (PE) having a low absorption rate of carbon dioxide laser light.

<Evaluation>
The packaging materials of Example 1 and Comparative Example 1 described above were prepared, and the presence or absence of surface scratches, hand-cutting inducibility, and piercing strength (force required to break the packaging material) were compared. The results are shown in Table 1.

As a result of the evaluation, after the laminated body was irradiated with the laser beam, the surface was not scratched in Example 1, while the surface was scratched in Comparative Example 1. In addition, both Example 1 and Comparative Example 1 had good hand-cutting inducibility. Further, the piercing strength into the packaging material was 5.7 N in the fragile processed portion in Example 1, which was about 59% lower than that in the fragile processed unformed portion, while in Comparative Example 1, the fragile processed portion was formed. At 3.6N, it decreased by about 78% compared to the fragile unprocessed part.

As is clear from the above table, Example 1 which is the packaging material 1 according to the present invention has no scratches on the surface, and therefore has a good appearance. In addition, the piercing strength is higher than that of the packaging material of Comparative Example 1. However, in Example 1, the hand-cutting inducibility is good, and the piercing strength is such that there is no problem in breaking by hand. That is, Example 1, which is an example of the packaging material according to the present invention, can have a certain degree of piercing resistance and can also have breakthrough and hand-cutting inducibility.

As described above, according to the package according to the present embodiment, in the present invention, the fragile processed portion is formed only in the intermediate layer in the laminated body composed of the outermost layer, the intermediate layer, and the innermost layer. Easy-to-open is maintained because it is fragile enough to be opened by pushing or piercing. In addition, since the fragile processed portion, which is a scratch, cannot be seen on the surface of the packaging material, the appearance is good. For example, even when the outermost layer is provided with a content display by printing or a decorative layer, the fragile processed portion is only the intermediate layer. Since it is provided in, it is not visible from the surface of the outermost layer and does not impair the design. Furthermore, there is no risk of being caught in this fragile machine and torn during transportation.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 ・ ・ ・ Packaging material 2 ・ ・ ・ Laser light 3 ・ ・ ・ Fragile processing part 4 ・ ・ ・ Push-open part 5 ・ ・ ・ Straight cut line 6 ・ ・ ・ Break-prevention barb part 7 on the push-open part・ ・ Straight breakthrough part 8 ・ ・ ・ Tear prevention part 9 ・ ・ ・ Rupture prevention barb part 10 on the tear prevention part 10 ・ ・ ・ Bending cut line 11 ・ ・ ・ Straight guide part 12 ・ ・ ・Composite cut line (a set of the bent cut line 10 and the linear guide portion 11)
13 ... Breakthrough part 20 ... Packaging body 21 ... Storage body 22 ... Lid part 23 ... Container body 24 ... Packaging bag 25 ... Front member 31 ... Base material layer 32 ... Intermediate layer 33 ... Sealant layer

Claims (6)

In a packaging material composed of a laminate consisting of an outermost layer, an intermediate layer, and an innermost layer,
Only the intermediate layer has a portion having a high absorption rate of laser light.
Due to the laser light emitted from the outermost layer side or the innermost layer side, a fragile processed portion is formed only in a portion of the intermediate layer having a high absorption rate of the laser light.
A packaging material characterized by that. A packaging material characterized in that the thickness of a portion of the intermediate layer having a high laser light absorption rate is 13% or more and 18% or less of the entire laminate. From the linear cut line formed so that the fragile machined portion is formed between the push-open portion at both ends and the push-open portion at both ends and in contact with each of the push-open portions at both ends. The packaging material according to claim 1 or 2, wherein the packaging material is configured. The fragile machined portion is composed of a tear prevention portion at both ends and a linear breakthrough portion located between the tear prevention portions at both ends.
The linear breakthrough portion is formed so that both ends of the linear breakthrough portion face the tear prevention portions of the both end portions and do not contact each of the tear prevention portions of the both end portions. Yes,
The packaging material according to claim 1 or 2, wherein the packaging material is characterized by the above. The fragile machined portion is formed by forming a set of a bent cut line and a linear guide portion in a straight line.
The linear guide portion is composed of a cut portion and a non-cut portion, and is composed of a cut portion and a non-cut portion.
The bent cut line includes a diagonal line portion inclined to the lower right from the upper left side of the linear guide portion to the linear guide portion side, and the linear guide from the lower left side of the linear guide portion. It is composed of a diagonal line portion inclined to the upper right on the portion side, and has a bent portion by connecting the ends of the respective diagonal line portions on the linear guide portion side.
A cut portion of the linear guide portion is formed so as to be in contact with the right side of the bent portion.
The packaging material according to claim 1 or 2, wherein the packaging material is characterized by the above. A package obtained by sealing and packaging the contents using the packaging material according to any one of claims 1 to 5.

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