JP2006256626A - Packaging bag having unidirectional tearability - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag having unidirectional tearability which is used for packaging thick and heavy contents of in various kinds of packaging fields including medicines and foods having excellent gaseous oxygen barrier property, transparency and pin-hole resistance, in particular, suitably for an exterior bag for a transfusion bag to hermetically package the so-called transfusion bag to fill injection solution or the like of relatively large volume in a flexible plastic container. <P>SOLUTION: In the packaging bag having unidirectional tearability, a laminate film is formed of a laminate of an oriented polypropylene film having unidirectional tearability and a barrier film, and providing a sealant layer at least its either side. The sealant layers face each other so that the tearing direction of the laminate film is matched with each other, and a peripheral edge portion is sealed and formed in a bag shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a packaging bag having excellent oxygen gas barrier properties, transparency and pinhole resistance and unidirectional tearing properties, and more particularly used as a packaging bag for packaging pharmaceutical products and foods, and particularly relatively large. The present invention relates to a packaging bag having one-way tearability, which is suitably used as an outer bag for an infusion bag for hermetically packaging a so-called infusion bag, in which a flexible plastic container is filled.

  Infusions, which are relatively large-capacity injections, have been filled in glass bottles in the past, but in recent years, they have been filled in flexible bag-like plastic containers from the viewpoint of weight reduction and waste reduction. (So-called infusion bags) are increasing.

  Various chemical solutions such as amino acid preparations, glucose preparations, and fat emulsions filled in an infusion bag are easily deteriorated by gas, particularly oxygen, but the gas barrier property of the bag material is not always sufficient. For this reason, if the infusion bag is left unattended, a gas such as oxygen in the atmosphere passes through the wall of the container and dissolves in the chemical solution, causing a problem that the chemical solution is altered over time. Therefore, the infusion bag is covered with a bag having gas barrier properties.

  As described above, the exterior bag of this infusion bag is required to have a barrier property against gas such as oxygen, but in addition, transparency for visually testing the quality of the chemical solution as the contents, the bag Therefore, it is required to have a hand cutting property for facilitating the removal of the gas and a pinhole resistance for maintaining a gas barrier property during transportation and storage.

  In addition, when the infusion bag stored in such an outer bag is used for home medical care, a doctor or a nurse, etc., once opens the outer bag in the hospital and prior to its use using a syringe or the like, For example, after injecting vitamin preparations, etc., after applying the prescribed dispensing treatment according to the infusion solution to the infusion bag, the outer bag is resealed, and the infusion bag is handed to the patient and administered. Will be kept at home by the patient. To re-seal the once opened outer bag, for example, a method of sealing the opening of the opened outer bag by using a welding jig or by sandwiching with a stopper or the like Is adopted. For example, as shown in FIG. 15 (a), when the infusion bag 40 is folded in half and stored and the mouth portion is heat-sealed, the heat-sealed upper both side edges are not covered with the seal portion 70e. A pair of cuts (notches) 70a, 70a are formed as a trigger for breaking, and after opening the infusion bag 40 for dispensing treatment, the exterior bag whose mouth is resealed, In the outer bag 70 (1) for infusion bags in which a pair of cuts 70b, 70b are formed as a trigger for opening (breaking) again, as shown in FIG. Since the laminated material 80 constituting 1) lacks unidirectional tearability (straight cut property), the cut 70g of the opened outer bag 70 (2) is usually meanderingly curved, so that a sufficient welding allowance is provided. And pinching allowance Not always can be ensured, the mouth portion of the outer bag has been opened, over its entire width, there is a problem difficult to reliably resealing.

  At present, as a packaging material for an infusion solution, as a gas barrier layer, a PVA film (polyvinyl alcohol film), a polyvinylidene chloride film (PVDC film), a polyethylene terephthalate film with a PVDC coating (PVDC coated PET film), etc. are laminated. Wrapped packaging materials are known.

All of these exterior materials have good gas barrier properties and transparency. However, since PVA, vapor-deposited PET, PVDC, etc. contained in these exterior materials have high rigidity and little elongation, the exterior bag is bent or rubbed due to vibration when transporting the infusion agent, or When subjected to a drop impact, tissue fatigue is likely to occur. For this reason, pinholes are likely to occur, and the gas barrier properties may be greatly reduced.

  In particular, the portion where pinholes are likely to occur is the bottom portion of the outer bag, and among them, bent portions on both sides of the bottom portion generated by the bag wall being pushed by the stored infusion bag. At present, infusion bags are packaged in flat bag-type outer packaging bags, and some of the outer packaging packages are packaged in cardboard boxes for shipment, transportation and storage. In this shipping form, the outer bag is bent, rubbed, or subjected to a drop impact in the cardboard box, but at the same time, the infusion is concentrated on the bottom side of the bag. For this reason, the external force such as bending is naturally stronger on the bottom side, and pinholes are more likely to occur. Further, the flat bag type outer bag does not sufficiently follow the shape of the infusion bag to be stored, and the distortion is concentrated on both sides of the bottom portion of the outer bag, thereby forming a remarkable bent portion (wrinkle) there. This bent portion is always bent by vibration during transportation or the like, and the stress of rubbing or dropping impact is concentrated on this portion, so that pinholes are particularly likely to occur.

  The present invention has been made in order to solve the above-described problems, and has excellent oxygen gas barrier properties, transparency, and pinhole resistance, and has a thickness and weight in various packaging fields including pharmaceuticals and foods. It is used as a packaging bag for packaging things, and is particularly preferably used as an outer bag for an infusion bag for hermetically packaging a so-called infusion bag in which a flexible plastic container is filled with a relatively large volume of injection solution or the like. It aims at providing the packaging bag which has direction tearability (linear tearability).

To achieve the above objectives, ie
The invention according to claim 1
Laminated polypropylene film and barrier film with unidirectional tearability are laminated, and at least the sealant layer is provided on either side of the laminate film so that the tear direction is the same, and the peripheral edge is sealed It is a packaging bag having one-way tearing characteristics, characterized by being formed into a bag shape.

The invention according to claim 2
Laminate a stretched polypropylene film having a unidirectional tear property and a barrier film, provide a polyolefin film on either side, and provide a sealant layer on the opposite side so that the tear direction of the laminated film matches. The packaging bag having one-way tearability according to claim 1, wherein the packaging bag is formed in a bag shape by being opposed to each other and sealing a peripheral edge portion.

The invention according to claim 3
3. The packaging bag having one-way tearability according to claim 1, wherein the barrier film is a vapor-deposited nylon film made of a nylon film vapor-deposited with aluminum oxide or silicon oxide.

The invention according to claim 4
3. The packaging bag having one-way tearability according to claim 1, wherein the barrier film is a coextruded laminated film made of an ethylene-vinyl alcohol copolymer resin and a nylon resin.

The invention according to claim 5
A packaging bag having unidirectional tearing characteristics, wherein the packaging bag according to any one of claims 1 to 4 is used as an exterior bag for an infusion bag.

  According to the present invention, it is used as a packaging bag for packaging thick contents in various packaging fields including pharmaceuticals and foods, which has excellent oxygen gas barrier properties, transparency, and pinhole resistance, and has a relatively large capacity. It is possible to provide a packaging bag having one-way tearability, which is preferably used as an outer bag for an infusion bag for sealing and packaging an infusion bag, in which an injection solution or the like is filled in a flexible plastic container.

  Since the packaging bag of the present invention has one-way tearability (linear tearability), it is excellent in linear cutability, hand tearability, etc., and the contents can be easily taken out. Even when the mouth is resealed by welding using a welding jig or resealed by being clamped with a stopper or the like, the cut end of the packaging bag can be opened without meandering. The mouth portion of the packaged bag can be reliably resealed over its entire width.

  In addition, since the packaging bag of the present invention is excellent in oxygen gas barrier properties, it is suitably used as a liquid infusion bag exterior bag filled with various drugs such as amino acid preparations, glucose preparations, and fat emulsions that are easily altered by oxygen.

  Moreover, since the packaging bag of this invention has transparency, it becomes possible to visually test the quality of the chemical | medical solution which is the content.

  Furthermore, since the packaging bag of the present invention is excellent in pinhole resistance, it prevents bending due to vibration during transportation, etc., and also prevents pinholes due to rubbing and stress of drop impact, and has a gas barrier property over a long period of time. Can be maintained.

  Hereinafter, embodiments will be described with reference to the drawings. 1A is a schematic plan view showing an example of a packaging bag having unidirectional tearability according to the present invention, and FIG. 1B is a plan view showing a state in which an infusion bag is sealed and packaged in the packaging bag. It is a schematic diagram. FIG. 2 (a) is a schematic plan view showing a state in which a packaging bag having unidirectional tearability of the present invention in which an infusion bag is hermetically packaged is opened, and FIG. 2 (b) is a diagram once opened (a). It is a plane schematic diagram which shows the state which resealed the packaging bag shown in FIG. FIG. 3 is a schematic plan view showing another example of a packaging bag having unidirectional tearability according to the present invention. FIG. 4 is a schematic plan view showing still another example of a packaging bag having unidirectional tearability according to the present invention, and FIG. 4B is a schematic perspective view of the packaging bag shown in FIG. FIG. 5 is a schematic plan view showing a state in which the infusion bag is stored in the packaging bag shown in FIG. 6-8 is a cross-sectional schematic diagram which shows embodiment of the laminated | multilayer film which comprises the packaging bag which has the unidirectional tearability of this invention. FIGS. 9-11 is a cross-sectional schematic diagram which shows embodiment of the barrier film of the laminated film which comprises the packaging bag which has the unidirectional tearability of this invention. FIG. 12 (a) is a schematic perspective view of a long strip-shaped laminated film constituting a packaging bag having unidirectional tearability according to the present invention, and FIG. 12 (b) is a schematic view of the long strip shown in FIG. 12 (a). It is a schematic explanatory drawing explaining the process of manufacturing the packaging bag of a vertical surface using a laminated film. FIG. 13 is a schematic explanatory view for explaining a process of manufacturing a laterally-attached packaging bag using the long belt-like laminated film shown in FIG. FIG. 14 is an explanatory view for explaining a test piece for evaluation of a laminated film used in a tear test in the present invention. FIG. 15A is a schematic plan view showing a state where an infusion bag is sealed and packaged in a conventional exterior bag (packaging bag), and FIG. 15B is a state where the exterior bag shown in FIG. 15A is opened. It is a plane schematic diagram which shows.

As shown in FIG. 1 (a), as an example of an outer bag for an infusion bag, a packaging bag 10 (1) having one-way tearability according to the present invention is formed by stacking two laminated films 20 and 20, The bottom portion 10d and both side portions 10c, 10c are heat-sealed with a predetermined width, and when the infusion bag 40 is folded in half and the mouth portion is heat-sealed as shown in FIG. A pair of incisions (notches) 10a and 10a are formed on both side edges of the heat-sealed upper side edge so as not to reach the part seal portion 10e, and the infusion bag 40 A pair of cuts 10b and 10b are formed which are used as a trigger when the mouth portion is opened again (broken) after being opened once to perform the dispensing process. 1 (a) and 1 (b), the hatched portion indicates a heat seal portion, 10c and 10c are side edge seal portions, 10d is a bottom seal portion, and 10e is a mouth seal portion.

  As shown in FIG. 2 (a), the packaging bag 10 (2) of the present invention used as an infusion bag for an infusion bag with the infusion bag accommodated and the mouth heat-sealed is dispensed with the infusion bag 40 as shown in FIG. Since the cut film 10g once opened from the cut 10a portion for application, the laminated film 20 constituting the packaging bag 10 (3) has one-way tearing property, and thus has excellent linear cutting properties. Without being cut in a straight line. In the same figure (b), the opening part of the opened packaging bag which can ensure sufficient welding allowance and pinching allowance L at the time of resealing is welded and sealed using a welding jig. The schematic plan view of the packaging bag 10 (4) is shown, and the mouth seal part 10f of the opened packaging bag can be reliably resealed over its entire width.

  The packaging bag described above is an example of a packaging bag in which a pair of cuts (notches) 10a, 10a and 10b, 10b are formed as a trigger for breaking in the lateral direction, but the present invention breaks in the lateral direction. As shown in FIG. 3, the pair of cuts (notches) 10a, 10a and the pair of cuts (notches) used as the triggers for breaking in the vertical direction are not limited to The packaging bag 10 (5) in which the notches 10b and 10b are formed may be used.

  Since the laminated film 20 constituting the packaging bag having unidirectional tearability according to the present invention has a physical strength that has oxygen gas barrier properties and transparency and excellent pinhole resistance, it has a relatively large capacity. It is suitably used as an outer bag for an infusion bag for hermetically packaging an infusion bag filled with an injection solution or the like. Bending due to vibration during transportation, etc., and pinholes due to rubbing and dropping impact stress can be prevented and gas barrier properties can be maintained over a long period of time. It is a bottom part of the outer bag, and among them, the bottom part of the packaging bag is preferably a gusset having a predetermined width because it is a bent part on both sides of the bottom part that is generated when the bag wall is pushed by the stored infusion bag. . FIG. 4 shows another example of a packaging bag having one-way tearability of the present invention as an outer bag for an infusion bag. FIG. 4A is a front view showing a state in which the packaging bag 50 of such a preferred embodiment is folded, and FIG. 4B is a perspective view showing a state in which the packaging bag 50 is expanded.

  The packaging bag 50 has a flat front surface portion 20a, a rear surface portion 20b, and a bottom surface portion 51 of a gusset provided with a valley fold line 52 folded inwardly in a crease shape, and a side edge seal portion 50c. , 50c and the bottom seal portion 50d are three-side sealed packaging bags. A notch 50a for facilitating opening is provided on the top side of the side edge. Both side edges 53, 53 of the bottom face 51 are preferably heat-sealed integrally with the side edge seals 50c, 50c sandwiched between the front face and the rear face.

FIG. 5 shows a state where the infusion bag is accommodated in the packaging bag 50 and packaged. In this figure, an infusion bag 40 is a packaging bag 60 used as an infusion bag for an infusion bag in which the bag is folded in half and the top (mouth) of the bag is heat sealed (mouth seal 50f). Conventionally, bent portions are formed on both sides of the bottom portion in the past, and this has been a serious cause of pinholes. On the other hand, a packaging bag 60 as another example of the present invention having a bottom portion of a gusset is Since the shape of the infusion bag follows well and the bent portion is not formed to the extent that it can be said, it is a form of a packaging bag with very few pinholes.

  Next, an embodiment of the laminated film 20 constituting the packaging bag having unidirectional tearability of the present invention will be described.

  As an example of the laminated film 20 used in the present invention, as shown in FIG. 6, for example, a stretched polypropylene film 21 having a unidirectional tearability and a barrier film 22 are laminated, and stretched having a unidirectional tearability. A laminated film 20 (1) in which a sealant layer 23 is provided on the polypropylene film 21 side is used.

  As another example of the laminated film 20, as shown in FIGS. 7 and 8, a stretched polypropylene film having a one-way tearing property and a barrier film are laminated, and a polyolefin film is provided on either side thereof, and vice versa. A laminated film provided with a sealant layer on the side can be used. A laminated film 20 (2) shown in FIG. 7 is obtained by laminating a stretched polypropylene film 21 having a unidirectional tearing property and a barrier film 22, and laminating a polyolefin film 24 on the side of the stretched polypropylene film 21, and the opposite side. This is a laminated film having a structure in which a sealant layer 23 is laminated on the barrier film 22 side. A laminated film 20 (3) shown in FIG. 8 is formed by laminating a stretched polypropylene film 21 having a unidirectional tearability and a barrier film 22, and laminating a polyolefin film 24 on the barrier film 22 side, and on the opposite side. This is a laminated film having a structure in which a sealant layer 23 is laminated on the side of the stretched polypropylene film 21.

  As the stretched polypropylene film 21 having a unidirectional tear property used in the present invention, a uniaxially stretched film was laminated on a film stretched in one direction, a film stretched in one direction and stretched small in the other direction, or a biaxially stretched film. Polypropylene film can be used. In particular, when a uniaxially stretched polypropylene film is used as the stretched polypropylene film 21 having unidirectional tearability, it is desirable to laminate so as to be the inner layer (intermediate layer) of the laminated film.

  As the barrier film 22 used in the present invention, a vapor-deposited nylon film made of a nylon film vapor-deposited with aluminum oxide or silicon oxide, or a coextruded laminated film made of an ethylene-vinyl alcohol (EVOH) resin and a nylon resin is preferably used. Is done.

  A vapor deposited nylon film as the barrier film 22 used in the present invention will be described below with reference to FIGS.

  As shown in FIG. 9, for example, a vapor-deposited nylon film 22 (1) in which a vapor-deposited layer 25 is formed by vapor-depositing aluminum oxide or silicon oxide on a nylon film 26 substrate. As shown, the primer layer 27 and the vapor deposition layer 25 are protected on the nylon film substrate 26 for the purpose of improving the adhesion between the substrate 26 and the vapor deposition layer 25 and preventing delamination. The barrier coating layer 28 can also be formed for the purpose of imparting a high level of barrier properties.

The nylon film of the nylon film base material 26 for forming the vapor deposition layer is not particularly limited. For example, nylon 6, nylon 6-6, nylon 6-10, nylon 4-6, metaxylenediamine-6 nylon (MXD6) Films made of homopolymers such as or a mixture thereof, and films made of copolymers in a range that does not change the basic properties of these homopolymers. Either stretched or unstretched, and those having mechanical strength and dimensional stability are preferred.

  The thickness of the nylon film substrate 26 is not particularly limited, but it is 6 to 6 in consideration of suitability as a packaging material, that other layers may be laminated, and workability when the vapor deposition layer 25 is formed. The thickness is preferably 30 μm.

  The vapor deposition layer 25 used in the present invention is made of a vapor deposition film of an inorganic oxide such as aluminum oxide, silicon oxide, or a mixture thereof, and has transparency and gas barrier properties such as oxygen and water vapor. I just need it. However, the vapor deposition layer 25 of the present invention is not limited to the above-described inorganic oxide, and any material can be used as long as the material does not depart from the gist of the present invention.

  The optimum condition of the thickness of the vapor deposition layer 25 varies depending on the type and configuration of the inorganic compound to be used, but generally it is preferably in the range of 5 to 300 nm, and the value is appropriately selected. However, if the film thickness is less than 5 nm, a uniform film may not be obtained or the film thickness may not be sufficient, and the function as a gas barrier material may not be sufficiently achieved. In addition, when the film thickness exceeds 300 nm, the inorganic oxide thin film layer cannot retain flexibility, and the inorganic oxide thin film layer may be cracked due to external factors such as bending and pulling after the film formation. . Preferably, it exists in the range of 10-150 nm.

  Various means can be used to form the vapor deposition layer 25, but it is generally formed by a vacuum vapor deposition method. Sputtering, ion plating, plasma vapor deposition (CVD), or the like can be used as means other than this vacuum vapor deposition. However, considering productivity, the vacuum deposition method is the best at present. Any one of an electron beam heating method, a resistance heating method, and an induction heating method may be appropriately used as a heating means of the vacuum evaporation apparatus by this vacuum evaporation method. In order to improve the adhesion between the inorganic oxide thin film layer and the plastic substrate and the denseness of the inorganic oxide thin film layer, a plasma assist method or an ion beam assist method can be used. Further, in order to increase the transparency of the inorganic oxide thin film layer, it is possible to carry out reactive vapor deposition in which oxygen gas or the like is blown during vapor deposition.

  In addition, as shown in FIG. 10, between the vapor deposition layer 25 of the vapor deposition nylon film 22 and the nylon film base material 26, the adhesiveness between the nylon film base material 26 and the vapor deposition layer 25 is improved, and delamination is performed. It is also possible to provide a primer layer 27 for the purpose of preventing generation and the like. Examples of the primer layer 27 that can be used include a primer layer made of a composite of a silane coupling agent having an organic functional group or a hydrolyzate thereof, a polyol, an isocyanate compound, and the like. The primer layer 27 is provided on the nylon film substrate 22.

  The thickness of the primer layer 27 is not particularly limited as long as a uniform coating film can be formed, but is generally preferably in the range of 0.01 to 2 μm. When the thickness is less than 0.01 μm, it is difficult to obtain a uniform coating film, and the adhesion may be lowered. On the other hand, when the thickness exceeds 2 μm, the coating film cannot be kept flexible because it is thick, and the coating film may be cracked due to external factors, which is not preferable. Particularly preferred is a range of 0.05 to 0.5 μm.

  Further, a barrier coating layer for protecting the vapor deposition layer 25 and imparting a higher gas barrier property can be provided on the vapor deposition layer 25.

As the barrier coating layer 28, as a material for forming a coating layer that imparts a high gas barrier property, for example, a material comprising a water-soluble polymer and one or more metal alkoxides and / or a hydrolyzate thereof, and further, the metal The alkoxide is formed by coating a solution composed of tetraethoxysilane, triisopropoxyaluminum, or a mixture thereof. Other examples of the coating layer that imparts high gas barrier properties include those comprising a water-soluble polymer and silver chloride, and further wherein the water-soluble polymer is formed by applying a solution comprising polyvinyl alcohol. Specifically, a solution in which a water-soluble polymer and tin chloride are dissolved in an aqueous (water or water / alcohol mixed) solvent, or a solution in which a metal alkoxide is directly or previously hydrolyzed in the solution. The mixed solution is formed on the vapor deposition layer 25 by coating and heating and drying.

  The primer layer 27 and the barrier coating layer 28 are, for example, known printing methods such as offset printing method, gravure printing method, silk screen printing method, and well-known coating methods such as roll coating, knife edge coating, and gravure coating. Can be used.

  As the barrier film 22 in the present invention, in addition to the vapor-deposited nylon films 22 (1) and 22 (2), for example, a barrier film made of a coextruded film of ethylene-vinyl alcohol (EVOH) resin and nylon resin is also preferably used. As shown in FIG. 11, a barrier film 22 (3) having a three-layer structure in which an ethylene-vinyl alcohol (EVOH) resin layer is used as an intermediate layer and a nylon resin layer is coextruded on both sides can be used.

  Furthermore, examples of the polyolefin resin of the polyolefin film 24 used in the present invention include films such as ethylene homopolymers, propylene homopolymers, and copolymers of ethylene and propylene. Either a stretched film or an unstretched film can be used. Preferably, a biaxially stretched polypropylene film or the like is suitably used. The molecular weight of these polyolefins is generally 1 to 1,000,000, preferably 2 to 500,000, and particularly preferably 5 to 300,000.

  Furthermore, the sealant layer 23 used in the present invention is a layer for sealing the laminated film when used practically as the packaging bag of the present invention by heat fusion. Such a sealant layer material is not particularly limited, and conventionally known heat-sealable resins can be used. For example, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene -Resins such as methacrylic acid copolymer, ethylene-methacrylic acid ester copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer and their metal cross-linked products are used. Although the thickness is determined according to the purpose, it is generally in the range of 20 to 80 μm.

  In the present invention, the method of laminating the stretched polypropylene film 21 having a unidirectional tearing property and the barrier film 22 is desirably laminated by, for example, an extrusion sand lamination method using an epoxy-modified polyethylene resin. By using the above-mentioned epoxy-modified polyethylene resin, interlayer adhesion is firmly performed without using an anchor coating agent.

  The epoxy-modified polyethylene resin is a resin composition containing 99.9 to 80 parts by weight of a polyethylene resin (A) and 0.1 to 20 parts by weight of an epoxy group-containing ethylene copolymer (B), The epoxy group-containing ethylene copolymer (B) is a two-component copolymer of ethylene and an epoxy group-containing unsaturated monomer, and the epoxy group-containing unsaturated monomer is glycidyl methacrylate, glycidyl acrylate, Allyl glycidyl ether or 2-methylallyl glycidyl ether, the content of the epoxy group-containing unsaturated monomer in the epoxy group-containing ethylene copolymer (B) is 0.1 to 4 mol%, and the resin composition A resin composition for extrusion laminating having a melt flow rate of 0.5 to 50 g / 10 min. It can be applied to lamination techniques described in Pat.

  Since the laminated film forming the packaging bag having unidirectional tearability according to the present invention has the above-described configuration, it is particularly excellent in oxygen gas barrier properties, transparency, and pinhole resistance, and has unidirectional tearability. Is.

  Next, the packaging bag 10 (1) having the unidirectional tearability of the present invention shown in FIG.

  The packaging bag 10 (1) having one-way tearability according to the present invention shown in FIG. 1 has two laminated films 20 and 20 overlapped so that the tearing directions coincide with each other, and the bottom and both sides thereof have a predetermined width. As shown in FIG. 4B, when the infusion bag 40 was stored and the mouth was heat-sealed, it was heat-sealed so as not to cover the mouth-sealed portion 10e. A pair of cuts 10a and 10a are formed on both side edges of the upper portion, and after opening the infusion bag 40 for dispensing treatment, the mouth portion is opened again (breaking) ), A pair of cuts 10b and 10b are formed.

  The packaging bag 10 (1) having the unidirectional tearability of the present invention used as the outer bag for an infusion bag configured as described above is a continuous belt-like bag as shown in FIG. 12 (a). As shown by the arrow in the figure, the laminated film 20 that forms a strip-like shape having a tear layer imparted with tearing properties in a direction (lateral direction) perpendicular to the feeding direction from the raw fabric roll R The laminated film 20 is manufactured as follows.

  First, the long belt-like laminated film 20 fed out from the raw roll R is in a direction (lateral direction) orthogonal to the feeding direction from the raw roll R so that the sealant layers on the inner surface side are in contact with each other. Sent while being folded in half.

  In this way, the laminated film 20 'folded in two in the horizontal direction is continuously heat-sealed at a predetermined width on both side edges by a vertical seal roller (not shown), and then a horizontal seal bar (not shown). The cuts 10a, 10a, 10b, and 10b are formed at predetermined positions on both side edges of the heat-sealed edges by a punching blade (not shown). It is formed. Further, the cuts 10a and 10b may be formed when the infusion bag is hermetically packaged in the outer bag for infusion bags.

  As described above, in the outer bag 10 (1) for infusion bags, the laminated film 20 forming itself has a tear property in a direction (lateral direction) perpendicular to the feeding direction from the raw roll R. Since the laminated film 20 is used so that the tearing direction of the tearing layer matches the opening direction, as shown in FIG. The cut formed by breaking from the insert 10a is substantially linear. Therefore, in this outer bag 10 (1) for infusion bags, as shown in FIG. 5B, a sufficient resealing allowance L necessary for resealing is ensured without making the bag length longer than necessary. Can be secured.

  As described above, the long belt-like laminated film 20 having a tear layer imparted with tearing properties in a direction (lateral direction) orthogonal to the feeding direction from the raw roll R is folded in two in the lateral direction. Since the bag forming laminated film base material 20 'is a bag-making method, the mouth side of one adjacent infusion bag exterior bag 10 (1) and the bottom side of the other infusion bag exterior bag are mutually connected. The infusion bag outer bag 10 (1) from the bag-forming laminated film base material 20 'is cut by sequentially cutting the boundary portion between the two infusion bag outer bags connected to each other. And the formation of the mouth portion for the infusion bag exterior bag 10 (1) can be performed simultaneously.

  In addition, in the manufacturing method of the packaging bag which has the unidirectional tear property of this invention mentioned above, although the elongate strip | belt-shaped laminated | multilayer film 20 drawn | fed out from the original fabric roll R is made to fold in two, this, However, the present invention is not limited to this, and two laminated films 20 fed out from two original fabric rolls may be superposed on each other. However, even in that case, it goes without saying that the tear layer of each laminated film 20 must be provided with tearing properties in a direction (lateral direction) perpendicular to the feeding direction from the raw fabric roll.

  In addition, the bag forming laminated film base material is exemplified by a method for manufacturing a packaging bag having a unidirectional tearing property in which a lateral tearing property is imparted by a bag-making method on a vertical surface. It is not limited to tearability, but as shown in FIG. 13, a long strip shape having a tear layer imparted with tearability in a direction (lateral direction) orthogonal to the feeding direction from the raw roll R A packaging bag having a unidirectional tearing property, in which the laminated film 20 is folded in half in a lateral direction to a bag-forming laminated film base material 20 'by a lateral surface bag making method. It can also be manufactured.

  The unidirectional tearable packaging bag of the present invention obtained above is used as a packaging bag for packaging pharmaceuticals and foods, which is excellent in oxygen gas barrier properties, transparency, and pinhole resistance, and has a particularly large injection volume. It is suitably used as an outer bag for an infusion bag for hermetically packaging a so-called infusion bag in which a liquid or the like is filled in a flexible plastic container.

  In addition, since it has one-way tearability (straight tearability), it is excellent in straight cutability, hand tearability, etc., and the contents can be easily removed, and the mouth of the opened outer bag is welded. Even when resealing by welding using a jig, or by resealing by sandwiching with a stopper or the like, the cut end of the outer bag does not meanderly curve, The mouth can be reliably resealed across its full width. Moreover, since it has transparency, it becomes possible to carry out the visual test of the quality of the chemical | medical solution which is the content. Furthermore, since it has excellent pinhole resistance, it can prevent bending due to vibration during transportation, etc., and can prevent pinholes from being rubbed or stressed by drop impact, and can maintain gas barrier properties for a long period of time. .

  Examples of the present invention will be specifically described below.

  A uniaxially stretched polypropylene (OPP) film having a thickness of 25 μm is used as a stretched polypropylene film having unidirectional tearing properties, and a nylon (NY) film layer (thickness 8 μm) / ethylene-vinyl alcohol (EVOH) is used as a barrier film. Using a three-layer coextrusion laminated barrier film consisting of a polymer resin layer (thickness 9 μm) / nylon (NY) film layer (thickness 8 μm), an epoxy-modified polyethylene resin (manufactured by Nippon Polyethylene Industry Co., Ltd., “LC605Y”) is used. And laminated by an extrusion sand lamination method, and a 20 μm thick biaxially stretched OPP film is laminated on the uniaxially stretched OPP film side so that the tearing directions coincide with each other, and on the opposite side of the laminated barrier film side As a sealant layer, 60 μm thick linear low density To prepare a laminated film constituting the packaging bag with a unidirectional tear of the present invention by laminating a polyethylene film.

  In Example 1, a nylon (NY) film layer (thickness 8 μm) / ethylene-vinyl alcohol (EVOH) copolymer resin layer (thickness 9 μm) / nylon (NY) film layer (thickness 8 μm) A laminated film constituting a packaging bag having unidirectional tearability of the present invention was produced in the same manner as in Example 1 except that an aluminum oxide vapor-deposited nylon film having the following constitution was used instead of the extruded laminated barrier film.

<Aluminum oxide-deposited nylon film>
As a base material, a vapor deposition thin film layer having a thickness of about 40 nm is formed on a single surface of a 159 μm thick nylon (NY) film by a vacuum vapor deposition apparatus, and a coating agent having the following composition is further applied by a bar coater. Then, it was dried at 120 ° C. for 1 minute with a dryer to form a gas barrier coating layer having a thickness of 0.3 μm.

<Composition of coating agent>
The following (1) liquid and (2) liquid mixed at a mixing ratio (wt%) of 65/35.
(1) Liquid: A hydrolyzed solution having a solid content of 3 wt% (in terms of SiO ₂ ) obtained by adding 89.6 g of hydrochloric acid (0.1N) to 10.4 g of tetraethoxysilane and stirring for 30 minutes for hydrolysis.
(2) Solution: 3 wt% water / isopropyl alcohol solution of polyvinyl alcohol (90/10 by weight ratio of water / isopropyl alcohol).

  A biaxially stretched polypropylene (OPP) film having a thickness of 20 μm is used as a stretched polypropylene film having unidirectional tearability, and a nylon (NY) film layer (thickness 8 μm) / ethylene-vinyl alcohol (EVOH) is used as a barrier film. Using a three-layer coextrusion laminated barrier film consisting of a polymer resin layer (thickness 9 μm) / nylon (NY) film layer (thickness 8 μm), an epoxy-modified polyethylene resin (manufactured by Nippon Polyethylene Industry Co., Ltd., “LC605Y”) is used. And laminated by an extrusion sand lamination method, and a uniaxially stretched OPP film having a thickness of 20 μm is laminated on the laminated barrier film side so that the tearing directions coincide with each other as a polyolefin film, and the sealant layer is thickened on the laminated barrier film. 60μm linear low density polyethylene The laminated film constituting the packaging bag having a unidirectional tear properties of the film were laminated with the present invention was fabricated.

  In Example 3, a three-layer structure comprising nylon (NY) film layer (thickness 8 μm) / ethylene-vinyl alcohol (EVOH) copolymer resin layer (thickness 9 μm) / nylon (NY) film layer (thickness 8 μm) A laminated film constituting a packaging bag having one-way tearability of the present invention was produced in the same manner as in Example 3 except that the aluminum oxide vapor-deposited nylon film used in Example 2 was used instead of the extruded laminated barrier film.

As a comparative example for comparing the performance of the laminated film constituting the packaging bag having unidirectional tearability of the present invention,
In Example 3, a laminated film constituting a packaging bag was produced in the same manner as in Example 3 except that a monoaxially stretched OPP film having a thickness of 20 μm was coextruded as a polyolefin film and laminated on the laminated barrier film side.

As a comparative example for comparing the performance of the laminated film constituting the packaging bag having unidirectional tearability of the present invention,
In Example 4, a laminated film constituting a packaging bag was produced in the same manner as in Example 4 except that a monoaxially stretched OPP film having a thickness of 20 μm was not laminated on the aluminum oxide-deposited nylon film side as a polyolefin film.

  A tear test was performed on the laminated films constituting the packaging bags obtained in the above Examples 1 to 6 based on the following test methods, and the unidirectional tearability and tear strength (tear resistance) of the laminated films were evaluated. The evaluation results of the unidirectional tearability are shown in Table 1, and the results of tear strength (tear resistance) are shown in Table 2.

<Tear test>
In accordance with JIS K7128, a test piece shown in FIG. 14 was prepared, a cut of 75 mm was provided from the end face of the test piece, and a tear rate of 200 mm / min. The average value of the amount of deviation (ΔX) from the center of the tearing opening was obtained from three measurements, and the tear strength was further measured. The measurement results of the amount of deviation (ΔX) are shown in Table 1, and the measurement results of tear strength are shown in Table 2.

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  From Table 1, the laminated film which comprises the packaging bag which has the unidirectional tear property of this invention obtained in Examples 1-4 compared with the laminated film obtained in Examples 5 and 6 as a comparative example. The amount of deviation (ΔX) is small, and the cut surface is excellent in unidirectional tearability (linear tearability) without meandering.

  Moreover, the laminated film which comprises the packaging bag which has the unidirectional tearability of this invention obtained in Examples 1-4 from Table 2 is compared with the laminated film obtained in Examples 5 and 6 as a comparative example. Since the tear strength is extremely small and the tear resistance is small, it can be easily torn and has excellent hand cutting properties.

  Even if the packaging bag shown in FIG. 1 (a) using the laminated films obtained in Examples 1 to 4 is prepared and torn from the notch 10a, it can be easily torn similarly, and the cut end is a meandering curve. It was excellent in unidirectional tearability (straight tearability) and hand tearability.

(A) is a plane schematic diagram which shows an example of the packaging bag which has the unidirectional tearability of this invention, (b) is a plane schematic diagram which shows the state which sealed the infusion bag in the said packaging bag. (A) is a plane schematic diagram which shows the state which opened the packaging bag which has the unidirectional tearability of this invention in which the infusion bag was sealed and packaged, (b) is the packaging bag shown to (a) once opened It is a plane schematic diagram which shows the state which sealed again. It is a plane schematic diagram which shows the other example of the packaging bag which has the unidirectional tearability of this invention. It is a plane schematic diagram which shows another example of the packaging bag which has the unidirectional tear property of this invention, (b) is a perspective schematic diagram of the packaging bag shown to (a). FIG. 4 is a schematic plan view showing a state where the infusion bag is stored in the packaging bag shown in FIG. 3. It is a cross-sectional schematic diagram which shows embodiment of the laminated | multilayer film which comprises the packaging bag which has the unidirectional tearability of this invention. It is a cross-sectional schematic diagram which shows embodiment of the laminated | multilayer film which comprises the packaging bag which has the unidirectional tearability of this invention. It is a cross-sectional schematic diagram which shows embodiment of the laminated | multilayer film which comprises the packaging bag which has the unidirectional tearability of this invention. It is a cross-sectional schematic diagram which shows embodiment of the barrier film of the laminated film which comprises the packaging bag which has the unidirectional tearability of this invention. It is a cross-sectional schematic diagram which shows embodiment of the barrier film of the laminated film which comprises the packaging bag which has the unidirectional tearability of this invention. It is a cross-sectional schematic diagram which shows embodiment of the barrier film of the laminated film which comprises the packaging bag which has the unidirectional tearability of this invention. (A) is a perspective schematic diagram of the elongate strip-shaped laminated film which comprises the packaging bag which has the unidirectional tear property in this invention, (b) is a bag-making method which attaches a vertical surface to a elongate strip-shaped laminated film. It is explanatory drawing explaining these. It is explanatory drawing explaining the bag making method of a horizontal surface attachment to the elongate belt-shaped laminated | multilayer film shown to Fig.12 (a) in this invention. It is explanatory drawing explaining the test piece for laminated film evaluation which comprises the packaging bag used by the tear test in this invention. (A) is a plane schematic diagram which shows the state which the infusion bag sealed and packaged in the conventional exterior bag (packaging bag), (b) is a plane schematic diagram which shows the state which opened the exterior bag shown to (a). FIG.

Explanation of symbols

10 (1), 10 (2), 10 (3), 10 (4), 10 (5), 50, 60, 70 (1), 70 (2) ... packaging bag (outer bag for infusion bag)
10a, 10b, 40a, 70a, 70b ... notches
10c, 40c, 50c, 70c ... side edge seal portion 10d, 40d, 50d, 70d ... bottom seal portion 10e, 10f, 60f, 70e ... upper end opening seal portion of packaging bag 10g, 70g Opening cut line 20, 20 (1), 20 (2), 20 (3), 80 ... laminated film forming a packaging bag 20 '... bag forming laminated film substrate 20a ... front of packaging bag Part 20b: Packaging bag rear part 21: Stretched polypropylene film layer 22, 22 (1), 22 (2), 22 (3) ... Barrier film layer 23 ... Sealant layer 24 ... Polyolefin Film layer 25 ... deposition layer 26 ... nylon film substrate layer 27 ... primer layer 28 ... gas barrier coating layer 29 ... ethylene-vinyl alcohol copolymer resin layer 3 ... nylon resin layer 40 ... infusion bag 51 ... upper opening of the packaging bag bottom portion 52 ... concave fold 53 ... packaging bag bottom portion side edge 54 ... packaging bag

Claims (5)

  Laminated polypropylene film and barrier film with unidirectional tearability are laminated, and at least the sealant layer is provided on either side of the laminate film so that the tear direction is the same, and the peripheral edge is sealed A packaging bag having unidirectional tearing characteristics, which is formed into a bag shape.   Laminate a stretched polypropylene film having a unidirectional tear property and a barrier film, provide a polyolefin film on either side, and provide a sealant layer on the opposite side so that the tear direction of the laminated film matches. 2. The packaging bag having one-way tearability according to claim 1, wherein the packaging bag is formed in a bag shape by sealing the peripheral edge portion.   3. The packaging bag having one-way tearability according to claim 1, wherein the barrier film is a vapor-deposited nylon film made of a nylon film vapor-deposited with aluminum oxide or silicon oxide.   3. The packaging bag having unidirectional tearability according to claim 1, wherein the barrier film is a co-extruded laminated film made of an ethylene-vinyl alcohol copolymer resin and a nylon resin.   A packaging bag having unidirectional tearing characteristics, wherein the packaging bag according to any one of claims 1 to 4 is used as an exterior bag for an infusion bag.

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