JP5315628B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag for a bag containing a liquid such as an infusion solution, and more particularly to a packaging bag capable of filling a bag containing a liquid such as an infusion solution by its own weight.

  Conventionally, in a packaging bag for a bag containing a liquid such as an infusion solution, the inner surface of the packaging bag is slippery so that the bag containing the liquid such as an infusion solution can be filled by its own weight. Is generally given.

  Usually, a packaging bag for storing products made of various contents is formed of a laminate made up of at least a film base material and a sealant film in consideration of the protection of the contents, storage stability, distribution suitability, etc. . In order to improve the filling and packaging suitability when filling the contents, that is, the opening of the filling port of the bag, the sealant film constituting such a laminate is imparted with appropriate slipperiness. Yes. Specifically, a slip agent is added to the sealant film.

  However, after lamination with the film base material, the slip agent migrates to the adhesive or other base material layer over time, and the concentration of the slip agent on the surface of the sealant is lowered. However, there is a problem that troubles occur in the bag making process, the content filling process, and the like due to deterioration of the properties and blocking resistance.

  In particular, it has been known that this problem appears remarkably in dry lamination using a polyether-based urethane adhesive. As countermeasures against these problems, a powder such as corn starch is applied to the sealant surface to impart slipperiness and blocking resistance. However, this method not only leads to an increase in the total packaging cost due to an increase in manufacturing process and an increase in material cost, but also has a problem that the powder adhering to the surface of the sealant is mixed into the contents. .

  In addition, when a large amount of slip agent is added to the sealant film, the slip agent bleeds out and appears on the surface of the film to exhibit its function.

  A method for solving such a problem has been proposed (for example, see Patent Document 1). That is, the lamination sealant film is multi-layered, and the slip agent and the anti-blocking agent are used for each surface layer to solve slipping and blocking resistance. However, it is not practical to produce a packaging bag using such a sealant film because the manufacturing process becomes very complicated.

Prior art documents are shown below.
JP-A-6-93250

  An object of the present invention is to provide a packaging bag capable of filling a bag containing a liquid such as an infusion solution by its own weight.

The present invention has been made to solve the above problems, the invention according to claim 1 of the present invention is a packaging bag for bag containing the liquid substance (20), at least, film a biaxially oriented polypropylene film as a base material (1), and the polyamide film as the intermediate layer, and a urethane-based adhesive as an adhesive layer, is formed by a laminate consisting of a sealant film (2) (10), said sealant The film (2) comprises a coextruded multi-layer film having three or more layers, and the anti-blocking agent (1) to 500 ppm of the slip agent (3) and inorganic particles only on the lower layer (2c) on the content side of the co-extruded multi-layer film ( 4) 10,000～20,000Ppm, a packaging bag which is characterized by containing.

Packaging bag according to the present invention includes at least a biaxially oriented polypropylene film as a film base material, a polyamide film as the intermediate layer, and a urethane-based adhesive as an adhesive layer, is formed by a laminate comprising a sealant film, The sealant film is composed of three or more layers of a co-extruded multilayer film, and the slip agent is 1 to 500 ppm only in the lower layer on the content side of the co-extruded multilayer film, and the anti-blocking agent composed of inorganic particles is 10,000 to 20,000.
00Ppm, by containing, slipperiness of the bag inner surface, blocking resistance is improved, filling and packaging suitability when filling the contents, i.e. the better the opening of the filling port of the bag, such as an infusion A bag containing liquid can be filled by its own weight.

  Embodiments of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a side sectional view showing one embodiment of a layer structure of a laminate forming a packaging bag according to the present invention, and FIG. 2 is a plan view showing one embodiment of the packaging bag according to the present invention. 3 is a plan view showing a state in which the packaging bag according to the present invention is gripped by a chuck provided in the filling packaging machine, and FIG. 4 is a plan view showing a state in which the packaging bag according to the present invention is opened and filled with contents. FIG. 5 is a plan view showing a state in which the packaging bag according to the present invention is filled with the contents, and FIG. 6 is a state in which the filling port is heat-sealed after the contents are filled into the packaging bag according to the present invention. FIG. 7 is a plan view showing a state in which a tearing start portion is provided at the same time that the filling port of the packaging bag according to the present invention is cooled and sealed after heat sealing.

The packaging bag (20) according to the present invention is a packaging bag (20) for a bag containing liquid contents such as infusion as shown in FIG. 2, and at least as shown in FIG. film substrate and a biaxially oriented polypropylene film as a (1), and the polyamide film as the intermediate layer, and a urethane-based adhesive as an adhesive layer, is formed by a laminate consisting of a sealant film (2) (10), said The anti-blocking agent comprising a sealant film (2) comprising a coextruded multilayer film having three or more layers, and a slip agent (3) of 1 to 500 ppm and inorganic particles only in the lower layer (2c) on the content side of the coextruded multilayer film (4) 10,000～20,000Ppm, a packaging bag which is characterized by containing.

As the film substrate (1), using the biaxially oriented polypropylene (PP) off Irumu.

By the way, the packaging bag (20) of the present invention is a film made of biaxially oriented polypropylene of the laminate (10) constituting the packaging bag (20) so that the contents stored therein can be easily taken out. As the substrate (1), it is preferable to use a film having linear tearability.

  Generally, a plastic film is roughly classified into a stretched film and an unstretched film. The stretched film is oriented by stretching the plastic film in two longitudinal and / or horizontal directions while heating the plastic film to a temperature below the melting point. An unstretched film is an unstretched film that has not been stretched, and has no molecular chain orientation and free molecular motion, and can be bonded by heat melting (heat sealing). The molecular chains of the stretched film are oriented in one direction in uniaxial stretching and in the plane direction in biaxial stretching, and the physical properties of the unstretched film can be improved. In addition, stretching increases stiffness (rigidity), transparency, tensile strength, and shrinkage, and improves gloss, moisture resistance, and barrier properties, but decreases elongation and tear strength.

A film having linear tearability made of biaxially stretched polypropylene was stretched in the longitudinal (longitudinal) direction [MD (machine direction) direction] and the lateral (transverse direction) direction (TD (transverse direction) direction) of the film . It has a performance (easy tearing property) that can be easily torn linearly in the direction.

  Next, as said sealant film (2), it is a film comprised by the innermost layer for sealing a laminated body (10) by heat sealing | fusion. As such a sealant film (2), a conventionally known thermoplastic resin can be used. Specifically, for example, 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, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methacrylic acid ester copolymer, ethylene -A film composed of an acrylic ester copolymer, an ionomer resin, an ethylene-vinyl acetate copolymer (EVA), etc. can be used. Among them, toughness, heat seal strength, contaminant sealability, hot tack property, Linear low with excellent stress crack resistance, heat resistance, oil resistance, odor resistance, etc. Degrees polyethylene resin (L-LDPE) is preferred.

However, the sealant film (2) of the laminate (10) forming the packaging bag (20) of the present invention is composed of a co-extruded multilayer film having two or more layers rather than a single-layer film consisting of one layer as described above. Since it is preferable, as shown in FIG. 1, it was set as the coextruded multilayer film which consists of three layers in which the upper layer (2a), the middle layer (2b), and the lower layer (2c) were laminated | stacked one by one .

  Further, only the lower layer (2c), which is the innermost layer on the content side of the coextruded multilayer film, contains the slip agent (3) in the range of 1 to 500 ppm and the antiblocking agent (4) made of inorganic particles of 10,000. Within the range of ˜20,000 ppm.

  When the added amount of the slip agent (3) is less than 1 ppm, the slipperiness and blocking resistance of the laminate are insufficient, and conversely, when it exceeds 500 ppm, the slipperiness becomes excessive, and the winding slippage of the laminate is reduced. This is not preferable because trouble occurs in a process before lamination, such as adhesion of white powder on a film transport roll or the like caused by a bleed slip agent.

  Moreover, since slip agent adheres to a machine at the time of filling of the contents and it accumulates, troubles, such as dropping of a slip agent, generate | occur | produce, it is unpreferable.

  Examples of the slip agent (3) include amide compounds such as stearic acid amide, erucic acid amide, erucic acid amide, and oleic acid amide, or a mixture thereof. Examples of the antiblocking agent (4) include silica, zeolite, and talc.

  The method for producing the co-extruded multilayer film is not particularly limited, and examples thereof include a method of producing using a multilayer die such as a flat die method (T-die method) multilayer extrusion molding method and an inflation multilayer extrusion molding method.

  There are two methods, one of which is to feed molten resin from a plurality of extruders into a feed block (a plurality of resins are joined together and fed into a die in a single layer flow and a die This is a feed block method in which the components are combined in layers in the middle of each other, and then fed into an ordinary single-layer flat die (T-die) and extruded as a multilayer film to widen it.

  The other is a method using a manifold [cylindrical space (resin reservoir) provided in a flat die for equalizing the flow rate and pressure of resin]] type multi-layer die. This is a multi-manifold method in which a multi-layer film is sent to separate manifolds in a flat die and joined and joined immediately before the die lip. This is a method of joining and multilayering in the die, but there is also an outside die method in which the die lip is pressed and then multilayered. The same method is also used for forming a multilayer film by the inflation method.

  Next, the thickness of the sealant film (2) is preferably in the range of 15 to 200 μm, preferably in the range of 30 to 90 μm, considering strength and processability (such as lamination and bag making). Is more preferable.

  Examples of the method for laminating the sealant film (2) and the film substrate (1) as described above include, for example, a dry lamination method, a non-solvent dry lamination method, a hot melt lamination method, an extrusion lamination method, and the extensible method. A known method such as a sandwich lamination method using a lamination lamination method can be appropriately used.

  In order to further improve the filling and packaging suitability of the packaging bag (20) using the laminate (10) obtained as described above, the waist strength of the laminate (10) is set to 100 to 300 mN / 15 mm width. It is necessary.

Thus, in order to give waist strength to the packaging bag (20), a polyamide is provided between the film substrate (1) made of biaxially oriented polypropylene and the sealant film (2) which is a coextruded multilayer film of three or more layers. intermediate layer of film (not shown) Ru provided.

  The functions include strength, mechanical toughness, bending resistance, puncture resistance, impact resistance, wear resistance, cold resistance, heat resistance, gas barrier properties, chemical resistance, and the like. ) To achieve these functions required as an intermediate layer.

The material for forming the intermediate layer made of the polyamide film is arbitrarily selected depending on the function required of the packaging bag (20), and examples thereof include non-stretched or stretched films of polyamide (PA) such as nylon-6 and nylon-66. However, a coextrusion stretched film of nylon-6 / nylon MXD6 (nylon mainly composed of metaxylylenediamine and adipate) / nylon 6 is preferable.

  Next, when the contents stored in the packaging bag (20) of the present invention require resistance to oxygen gas, water vapor, light, etc., long-term room temperature circulation, etc., the intermediate layer includes a gas barrier layer (see FIG. Need to be provided).

  As the gas barrier layer, a gas barrier resin film or a gas barrier film in which a gas barrier layer is provided on a film substrate is used. For example, ethylene-vinyl alcohol copolymer film (EVOH), polyvinyl alcohol film (PVA), ethylene-vinyl acetate copolymer (EVA) saponified film, polyethylene terephthalate (PET), polyamide (PA), polypropylene (PP) film coated with polyvinylidene chloride, aluminum foil, aluminum deposited layer, a film provided with a deposited thin film layer of inorganic oxide (silicon oxide, aluminum oxide, etc.) or one of these films Laminate films combining more than that can be used, but among these, aluminum foil with easy tearability on the film substrate, aluminum vapor deposition layer, inorganic oxides that can be easily disposed of (silicon oxide, aluminum oxide, etc.) ) Vapor deposition thin film layer Gas barrier film is preferred, especially in light of the recent environmental problems, inorganic oxide vapor deposition film disposal after use by depositing easy the inorganic oxide is frequently used more preferably.

  In addition, the said laminated body (10) may give the printing layer (not shown) other than said structure, or may contain the anchor coating layer (not shown).

  First, when printing on the film substrate (1) is provided, the printing surface of the film substrate (1) can be printed on either the front or back side, as in the case of printing on a general plastic film bag, In consideration of the friction resistance, weather resistance, etc. of the ink, it is preferable to provide beautiful picture printing on the inner surface of the film substrate (1) for the purpose of improving the sales promotion effect of the product.

  As the printing ink for performing the printing, a colorant composed of pigments or dyes that give color to the ink, a resin that adheres to the printed material and the resin are stabilized while dispersing and holding the colorant in fine particles. Dissolving the pigments and dyes, maintaining the dispersibility of the ink and fluidity of the ink, and transferring the appropriate amount of ink from the printing plate, a vehicle composed of a solvent, and further dispersibility of the coloring material, color development For the purpose of improvement, prevention of precipitation, and improvement of fluidity, it is formed from an auxiliary agent such as a surfactant. Particularly, the colorant is preferably a pigment having good weather resistance.

  The printing method for printing on the film substrate (1) is not particularly limited as long as it is a printing method capable of printing on the film substrate (1), but copper plating is performed on the surface of an iron cylinder (cylinder). A base is formed, a peeling layer is provided on the copper plating surface, copper plating is further performed, and a concave portion (cell) is created by a sculpture method or a corrosion method on a copper surface whose surface is polished into a mirror surface. A gravure printing method is preferred in which the printing ink in the cell is transferred to the film so that it can be printed in a colorful manner and has a high appealing effect.

  When printing on the film substrate (1), if necessary to improve the adhesion between the film substrate (1) and the ink, the printed surface of the film substrate (1) is treated with ozone treatment, corona. In order to further improve the adhesion between the film substrate (1) and the ink, an anchor coating agent or the like is coated on the printing surface of the film substrate (1). May be.

  Next, as shown in FIG. 2, the packaging bag (20) has two laminated bodies (10, 10 ') overlapped with each other on the inner surface side, and left and right seal portions (21, 21) and a lower seal. After the portion (22) is heat sealed and the contents are filled from the upper unsealed portion, the unsealed portion is heat sealed to form the upper seal portion (23), and the packaging in which the contents are stored The bag is complete.

Next, as an opening means for tearing and opening the packaging bag (20), a tear start portion (24) is provided at any position on the left and right of the upper edge of the upper seal portion (23), or left -It can provide in the arbitrary positions of the upper edge of a right seal part (21, 21). In the extending direction of the tear start portion (24) provided at these arbitrary positions, an unsealed portion serving as a content outlet is located.

  The shape and the formation method of the tear start portion (24) are not particularly limited as long as it has a trigger function capable of tearing. For example, a notch such as a V shape or a U shape, a cut line, a scratch processing, etc. A method of forming a laser beam oscillation cutting device or a rotary die cutter device incorporating a cutting blade into a bag making machine or the like can be used.

  Next, the process of filling and packaging an infusion bag as a content using the packaging bag will be described in detail with reference to FIGS.

  First, as shown in FIG. 3, the upper seal part (23) is gripped at an arbitrary position at both upper ends of the unsealed packaging bag by the chuck (25) provided in the filling and packaging machine.

  Next, as shown in FIG. 4, the upper ends of the packaging bag (20) are opened with suckers (28, 28) disposed on the front and rear surfaces of the packaging bag (20), and then the bag is inserted into the opening. A jig (hopper) (26) is inserted, and a bag (27) containing an infusion solution as the contents is inserted through the hopper (26).

  Next, as shown in FIG. 5, the packaging bag (20) is filled with the bag (27). Subsequently, as shown in FIG. 6, the unsealed upper seal portion (23) of the packaging bag (20) is heat sealed with a heat seal bar (29).

  Further, as shown in FIG. 7, the heat-sealed upper seal portion (23) is cooled by a cooling bar (30) and completely sealed, and at the same time, tearing start portions (24) are placed at both ends, A packaging bag (20) containing the bag (27) is obtained.

  Hereinafter, the packaging bag (20) of the present invention will be described in more detail with specific examples.

<Example 1>
As a film substrate constituting the packaging bag of the present invention, a biaxially stretched polypropylene (OPP) film having a thickness of 30 μm is used, and a low density polyethylene resin (LDPE) having a thickness of 20 μm is formed on the back surface of the OPP by an extrusion lamination method. Then, a co-extrusion stretched nylon film (nylon 6 / nylon MXD6 / nylon 6) having a thickness of 25 μm as an intermediate layer is laminated, and then, as a slip agent, only ELCA is used as a slip agent on the content side. 50 μm thick three-layer co-extruded multilayer film [L-LDPE / L-] using a linear low density polyethylene resin (L-LDPE) containing 500 ppm acid amide and 10,000 ppm silica particles as an antiblocking agent LDPE / L-LDPE (containing 500 ppm erucamide and 10,000 ppm silica particles) )] Is laminated by a dry lamination method through an adhesive layer of urethane adhesive, and OPP 30 μm / LDPE 20 μm / co-extrusion stretched Ny film 25 μm / adhesive / 3-layer co-extrusion multilayer film [L-LDPE / L-LDPE / L-LDPE (erucic acid amide 500 ppm, silica particles contained 10,000 ppm)] was produced in a wound laminate of 50 μm. This laminated body was obtained with a bag making machine to obtain a packaging bag in which the upper seal part was not sealed.

< Comparative Example 1 >
In Example 1, a packaging bag of Comparative Example 1 was obtained in the same manner as Example 1 except that the addition amount of silica particles was 2,000 ppm.

< Comparative example 2 >
In Example 1, the thickness of the biaxially oriented polypropylene (OPP) film is 20 μm, and the thickness of the low density polyethylene resin (LDPE) extruded by the extrusion lamination method on the back surface of the OPP for lamination with the intermediate layer is 15 μm. A packaging bag of Comparative Example 2 was obtained in the same manner as in Example 1 except that.

(Evaluation)
Using the packaging bags obtained in Example 1 and Comparative Examples 1 and 2 , each packaging bag was filled with a bag containing an infusion solution, and evaluation of the filling property and waist strength (mN / 15 mm) were measured. The evaluation criteria for fillability are as follows. ○: The infusion bag filled the packaging bag without any problem. X: The infusion bag stopped in the middle of the packaging bag and could not be filled. The evaluation results are shown in Table 1.

表１は、実施例１、比較例１、２で得た包装袋を用いて、各々の包装袋に輸液入りバッグを充填し、該充填性を評価した結果と腰強度の測定結果を記す。

Table 1 shows the results of evaluating the filling properties and the results of measuring the waist strength by filling each packaging bag with an infusion solution bag using the packaging bags obtained in Example 1 and Comparative Examples 1 and 2 .

(Evaluation results)
In Example 1, the anti-blocking agent was added in a larger amount than the amount of the slip agent added to the sealant film, and it was put in only one layer of the three-layered surface requiring contact (the surface in contact with the filling content). As a result, the slipperiness of the film was increased, and the laminate had a waist strength of 100 mN / 15 mm or more, thereby further improving the slipperiness and smoothly filling the contents by its own weight. In Comparative Example 1 , since the amount of the antiblocking agent was small, the slipperiness was insufficient and the filling property of the contents was poor. In Comparative Example 2 , the waist strength was slightly weak and the filling property was poor.

It is a sectional side view which shows one Example of the laminated constitution of the laminated body which forms the packaging bag which concerns on this invention. It is a top view which shows one Example of the packaging bag which concerns on this invention. It is a top view which shows the state which grips the packaging bag which concerns on this invention with the chuck | zipper with which the filling packaging machine was equipped. It is a top view which shows the state which opens the packaging bag which concerns on this invention, and is filled with the contents. It is a top view which shows the state which filled the content in the packaging bag which concerns on this invention. It is a top view which shows the state which heat-sealed the filling port, after filling the packaging bag which concerns on this invention. It is a top view which shows the state which provided the tear start part simultaneously with cooling and sealing, after heat-sealing the filling port of the packaging bag which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Film base material 2 ... Sealant film 2a ... Upper layer 2b ... Middle layer 2c ... Lower layer 10, 10 '... Laminate 20 ... Packaging bag 21 ... Left and right Seal part 22 ... Lower seal part 23 ... Upper seal part 24 ... Tear start part

Claims (1)

A packaging bag for bag containing the liquid body, consisting of at least the biaxially oriented polypropylene film as a film base material, a polyamide film as the intermediate layer, and a urethane-based adhesive as an adhesive layer, a sealant film Formed by a laminate, the sealant film is composed of a coextruded multilayer film of 3 or more layers, the slip agent is 1 to 500 ppm only in the lower layer on the content side of the coextruded multilayer film, and the antiblocking agent composed of inorganic particles is 10 , 000~20,000ppm, packaging bag characterized in that it contains.

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