JP2008007154A - Packaging bag with spout - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag with a spout which is not broken by a pin hole or an edge cut during storage or transportation and keeps its content clean. <P>SOLUTION: This packaging bag 1 with a spout used as an inside bag of an outer container has a packaging bag body 3 joined with a synthetic resin spout 4. The body 3 is storable in the outer container and the spout engaging part 41 of the spout 4 is detachably engaged with an opening of the outer container. The body 3 is formed in a bag body by forming a heat seal part 10 on outer peripheral edges of at least two film sheets. The spout mounting part 40 of the spout 4 is joined preferably by heat fusion with the area between seal faces at the top of the heat seal part 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a packaging bag with a spout used in an outer container, and more specifically, for storage and transportation of fluid contents in the industrial chemical field, pharmaceutical and cosmetic raw material field, and the like. The present invention relates to a packaging bag with a spout used by being housed in a packaged outer container.

  Conventionally, in the field of industrial chemicals, pharmaceuticals and cosmetics, etc., packaging bags with spouts that contain fluid contents are stored inside exterior containers made of aluminum, steel, stainless steel, fiberboard, etc. for storage and transportation. Used containers.

  Such a container can be reused simply by taking a used packaging bag out of the outer container and setting a new packaging bag in the outer container. Compared to filling fluid contents in steel and other exterior containers, it has the advantage of eliminating the hassle of washing, etc., and is widely used as a container for industrial chemicals, pharmaceuticals and cosmetic raw materials (for example, patent documents) 1 and 2).

  The container disclosed in Patent Document 1 has an inner bag for containing a high-purity chemical inside the outer container, and the outer container has an opening for taking in and out the high-purity chemical, and a pressure adjusting fluid. The inner bag is composed of an inner bag body and a high-purity chemical outlet, and the outlet is provided in communication with the opening of the hard outer container. Inner pipes for introducing and discharging chemicals are inserted, stoppers are fitted into the two openings, and handles are provided.

  The inner bag disclosed in Patent Document 1 cuts a cylindrical film manufactured using an inflation molding machine into a predetermined length, and opens a hole in the outer periphery of the cylindrical film cut into a predetermined length. It is manufactured by heat-sealing and fixing at the bottom mounting ring portion through the opening / closing port, and then heat-sealing both ends of the film, and has a configuration in which the inner bag body is provided with a loading / unloading port.

  In addition, the container disclosed in Patent Document 2 is similar to Patent Document 1 in that a bag having an attachment member in an exterior container (a drum can as referred to in Patent Document 2) cuts the attachment member into a lid (perforated). And then attached to the lid using a threaded ring or the like, and then attached to the drum body.

As shown in FIG. 8, the inner bag disclosed in Patent Document 1 and the bag referred to in Patent Document 2 are both heat-sealed around the outer peripheral edge to form a heat seal portion 501. ) A hole is made in a part of the surface of the bag on one short side, which is off the center of 500, and a slot (or mounting member) 502 is inserted into the hole. A bottom mounting ring 503 provided at the bottom is heat-sealed and attached.
JP-A-9-95565 Japanese National Patent Publication No. 5-505372

  However, the container of Patent Document 1 has a structure in which the opening / closing opening of the inner bag is inserted into the opening of the outer container and the opening / closing opening is supported by the opening by some fixing means. Is a structure in which an attachment member is inserted into a stopper port cut (perforated) in the lid and attached to the lid using a threaded ring or the like. In order to be stored and transported in a suspended state supported by a mouth or a mounting member, the weight of the fluid content is applied to the outer peripheral edge of the heat-sealed flange or bottom mounting ring. Therefore, there is a problem that the inner bag or the bag breaks, and a solution to this problem has been demanded. In particular, since the entry / exit port (or attachment member) 502 is usually attached to a substantially central portion near one short edge side of the bag, the heat-sealed flange portion 504 or bottom portion located on the other short edge side is provided. Since the weight of the flowable contents is concentrated on the outer peripheral edge of the mounting ring, there is a problem that a bag breakage due to a pinhole or edge breakage is likely to occur in this portion (the region indicated by P in FIG. 8). .

  Therefore, the present invention is a packaging bag having a spout that is accommodated in an outer container and supported by being attached to an opening of the outer container, such as a resist solution filled in the packaging bag during storage and transportation. There is no risk of breakage due to pinholes or broken edges even when the weight of the fluid content is high, and impurities such as impure particles (also called particles) and metal ions are not leached into the fluid content. It is an object of the present invention to provide a spout-equipped packaging bag that is excellent in cleanliness (the degree to which particles or the like are leached into a chemical solution from a resin composition forming a bag body and impure the chemical solution).

  The inventors of the present invention provide a bag body by forming a heat seal portion on the outer periphery of at least two or more films as a packaging bag body, and at a predetermined position of the heat seal portion between the sealing surfaces of the heat seal portion. By making a packaging bag with a spout into which a part of the spout is joined, there is no risk of breaking the bag even when the weight of the flowable content is increased during storage or transportation. It was found that impurities such as particles and metal ions were less leached and the cleanness could be maintained high, and the present invention was completed.

  More specifically, the present invention provides the following.

  (1) A packaging bag with a spout used as an inner bag of an outer container, wherein a spout is joined to the packaging bag body, and the packaging bag body can be accommodated in the outer container, and the spout Is detachable from the opening of the outer container, and the packaging bag body forms a bag body by forming a heat seal portion on the outer periphery of at least two or more films, and at a predetermined position of the heat seal portion. And the packaging bag with a spout in which a part of the spout is joined between the sealing surfaces of the heat seal part.

  The packaging bag with a spout according to the invention of (1) is a predetermined position of the heat seal portion in a bag body in which the heat seal portion is formed on the outer periphery of at least two films of the packaging bag body, and the heat seal Since a part of the spout is joined between the sealing surfaces of the parts, the strength is excellent, and leaching of impurities into the contents such as a resist solution filled in the packaging bag is extremely low, and the cleanness is high. Even if the weight of the fluid content such as a resist solution filled in the packaging bag is increased during storage and transportation, there is no possibility of causing bag breakage due to pinholes or cutting edges.

  In addition, this packaging bag with a spout is accommodated in the exterior container and used for storing and transporting chemicals such as industrial chemicals, medical products and cosmetic raw materials. Since the packaging bag body is suspended from the opening of the outer container, it is supported. In the packaging bag with spout of the present invention, the spout is provided in the heat seal portion formed on the outer periphery, so that the weight of the filled contents is the same as in the conventional packaging bag shown in FIG. It does not concentrate on the bag or the specific area (indicated by P in FIG. 8) of the inlet / outlet or the attachment member attached by heat welding to the bag, but it is applied to the entire fusion surface. Bag breakage due to hole or edge breakage hardly occurs.

  (2) The packaging bag with a spout according to (1), wherein the spout is configured to be able to support the packaging bag body by being locked to the opening of the outer container.

  According to the aspect of (2), since the spout is configured to be able to support the packaging bag body by engaging with the opening of the outer container, the packaging bag with the spout can be easily replaced. The used packaging bag can be reused simply by taking it out of the outer container and setting a new packaging bag in the outer container.

  (3) The packaging bag with a spout according to (1) or (2), wherein the spout is made of a synthetic resin that can be thermally bonded on the sealing surface.

  According to the aspect of (3), since the spout is made of a synthetic resin that can be thermally bonded at the sealing surface of the packaging bag body, the spout is simultaneously formed when the packaging bag body is heat-sealed to form a bag body. It can be heat-bonded and thermally bonded to the packaging bag body, and the packaging bag with spout can be efficiently formed as compared to bonding with an adhesive or the like. Moreover, since it is thermal bonding, since the spout and the film of the packaging bag body are integrated, the sealing property and the adhesiveness are excellent.

  (4) The packaging bag with a spout according to any one of (1) to (3), wherein a part of the spout includes a spout attachment portion that can be surface-bonded to the seal surface.

  (5) The spout-attaching packaging bag according to (4), wherein the spout attachment portion capable of surface joining forms a column having a convex lens shape as a whole, and a side surface of the pillar is a joining surface.

  (6) Plate-shaped rib portions are formed at both end portions of the convex lens-shaped column bodies before the bonding, and are obtained by performing the bonding including the rib portions (5). Packing bag with spout.

  According to the aspects of (4) to (6), the spout attachment portion is heat-sealed with the film of the packaging bag main body at the sealing surface of the packaging bag main body and thermally bonded to the packaging bag main body. Since the portion has a convex lens shape, a large bonding area with the inner layer film can be obtained, and fusion can be performed so as not to form a gap when heat-sealing. Furthermore, since the plate-like ribs are provided at both end portions, the plate-like ribs are melted at the time of heat-sealing, so that a further gap is not generated, so that the sealing property between the spout and the bag body is excellent. It will be.

  (7) The packaging bag with a spout according to any one of (1) to (6), wherein the spout is polyethylene and the sealing surface of the packaging bag body is polyethylene.

  According to the aspect of (7), since a spout is polyethylene and the sealing surface of a packaging bag main body is polyethylene, it is excellent in low temperature sealing property, and a spout is heat-sealed with the film of a packaging bag main body at low temperature. Can do. Moreover, there is little influence on the contents filled in the packaging bag, the cost is low, and it is general purpose.

  (8) The packaging bag with a spout according to (7), wherein the polyethylene on the sealing surface is a linear low density polyethylene polymerized by a metallocene catalyst.

  According to the aspect of (7), since the polyethylene is a linear low density polyethylene polymerized by a metallocene catalyst, the uniformity of the molecular structure is large, and mechanical strength such as tear strength and impact strength is improved. Excellent, less dissolved components in contents such as chemicals, and better heat sealability.

  (9) The packaging bag with a spout according to any one of (1) to (6), wherein the spout is a fluororesin and the sealing surface of the packaging bag body is a fluororesin.

  According to the aspect of (9), since the spout is made of fluororesin and the sealing surface of the packaging bag body is made of fluororesin, the heat resistance, chemical resistance, non-adhesiveness, and low temperature characteristics are excellent. Moreover, the influence on the contents filled in the packaging bag is less. Examples of the fluorine-based resin include tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (hereinafter abbreviated as PFA) as the spout, and polytetrafluoroethylene (hereinafter referred to as PTFE) as the sealing surface of the packaging bag body. Are abbreviated to be particularly preferred.

  (10) The packaging bag body is formed by stacking multiple films in which at least an outer layer film and an inner layer film are overlapped so that the inner layer films face each other and forming a heat seal portion on the outer periphery (1). (9) The packaging bag with a spout according to any one of the above.

  According to the aspect of (10), since one surface of the packaging bag main body has a multiple film configuration in which the inner layer film and the outer layer film are at least overlapped, for example, leaching of impure fine particles (particles) into the inner layer film. Using very few films and using a film with excellent strength, such as a stretched film, as the outer layer film, it has excellent mechanical strength and cleanliness, and impure fine particles (particles) in the contents such as resist solution filled in the packaging bag Leaching can be extremely reduced. Of course, by increasing the number of layers, it is possible to improve strength such as puncture resistance.

  Each of the inner layer film and the outer layer film may have either a single layer configuration or a multilayer configuration. In particular, the outer layer film has mechanical toughness, bending resistance, puncture resistance, impact resistance, cold resistance, heat resistance, and the like. It is preferable to have a multilayer structure because excellent performance is required in terms of heat resistance, chemical resistance, and the like, and heat fusion is also required.

  (11) The packaging bag with a spout according to (10), wherein the inner layer film is a coextruded film in which a polyamide layer is used as a core layer and a thermoadhesive resin layer is formed on both surfaces of the core layer via an adhesive layer. .

  According to the aspect of (11), the inner layer film is a coextruded film in which a polyamide layer is used as a core layer and a heat-adhesive resin layer is formed on both surfaces of the core layer via an adhesive layer. In addition to excellent mechanical strength such as flex resistance, puncture resistance, impact resistance, etc., it also has good heat fusion properties with the spout and the outer layer film. Here, the heat adhesive resin layer means a layer made of a resin that can be heat-sealed by heat sealing or the like, and a thermoplastic resin is preferably exemplified. Particularly preferred is polyethylene.

  (12) The packaging bag with a spout according to (10) or (11), wherein the outer layer film is a laminated film in which a heat-adhesive resin layer is formed on one surface of a biaxially stretched polyamide film via an adhesive.

  According to the aspect of (12), since the outer layer film is a laminated film in which a heat-adhesive resin layer is formed on one surface of the biaxially stretched polyamide film via an adhesive, toughness, flex resistance, It has excellent mechanical strength such as piercing properties and impact resistance, and also has good heat fusion properties with the inner layer film.

  (13) The packaging bag body according to any one of (1) to (12), wherein the corner portion of the inner edge of the heat seal portion is formed in an arc shape.

  According to the aspect of (13), since the corner | angular part of the inner edge of a heat seal part is formed in circular arc shape, when discharging the contents with which the packaging bag was filled, in the corner | angular part of the inner edge of a heat seal part It can be discharged without remaining.

  (14) The packaging bag with a spout according to any one of (1) to (13), which is used for containing a resist solution.

  (15) The packaging bag with a spout according to (14), wherein the volume capacity of the resist solution is 1L or more and 250L or less.

  According to the aspect of (14), the packaging bag with a spout of the present invention is excellent in strength and can be easily attached to and detached from the outer container. In addition, it has high chemical durability against solvents. For this reason, it is particularly suitable for containing a resist solution. In this case, the amount of the resist solution is, for example, 1 L or more and 250 L or less, but the packaging bag of the present invention is excellent in strength, and particularly excellent in sealing strength between the spout and the packaging bag body. It is particularly preferably used for accommodating such heavy objects.

  The packaging bag with a spout of the present invention has a configuration described in any one of the above (1) to (15), so that even if the weight of the fluid content is applied during storage or transportation, the pinhole or the edge breaks. There is no risk of breaking the bag. Moreover, when it is set as the multiple film structure which laminated | stacked the film of at least 2 sheets on one side, while the packaging bag main body is excellent in mechanical strength, such as toughness, bending resistance, puncture resistance, and impact resistance, Thus, there is an excellent effect that the degree of cleanliness can be kept high with less leaching of impurities such as particles and metal ions into the filled contents.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

<Overall configuration>
FIG. 1 is a plan view showing an embodiment of a packaging bag with a spout according to the present invention, and FIG. 2 (a) is a longitudinal sectional view of the spout (C-C cross section of FIG. 2 (b)), (b ) Is a bottom view as seen from the spout attachment portion side of the spout, and FIG. 3 is a schematic diagram showing a layer configuration of an embodiment of the multiple film used for the spout-equipped packaging bag according to the present invention. These are the schematic diagrams which show the layer structure of other embodiment of the multiple film used for the packaging bag with a spout which concerns on this invention.

  The spout-equipped packaging bag 1 according to the present invention includes a multi-film 2 in which at least the outer layer film 20 and the inner layer film 21 are overlapped, and is overlapped again so that the inner layer films 21 face each other, for a total of four sheets. Was heat-sealed in advance between the inner layer film 21 of the heat-sealed portion 10 (upper side in FIG. 1) of the packaging bag body 3 and the heat-sealed portion 10 on one side of the packaging bag body 3. A spout 4 is provided.

  In the present embodiment, the packaging bag body 3 is formed by laminating the multiple films 2 so that the inner layer films 21 face each other and heat-sealing four sides to form the heat-seal portion 10, but this is not limitative. For example, the multilayer film 2 may be formed by folding the multiple film 2 so that the inner layer films 21 face each other, and then heat-sealing the three outer peripheral sides that overlap each other. Further, the inner edge corner of the heat seal portion 10 may be formed in an arc shape. As a result, a structure in which the fluid content hardly remains at the corners is obtained. Moreover, the film may not necessarily be a multiple film, and the film configuration of the packaging bag body can be appropriately selected according to the contents and amount.

<Outlet>
The spout 4 includes a spout mounting portion 40 and a spout engaging portion 41 connected to one of the spout mounting portions 40. As shown in FIG. The inner layer film 21 is heat-sealed. Note the heat-sealed portion 10 including the outlet mounting portion 40, Note than the sealing width of the sealing portion A ₁ of the outlet attachment portion 40, the sealing portion A ₁ other than the right and left sealing portions A ₂ of the seal width overall is A taper (or a step) T ₁ is formed so as to be wide. The taper T _1, the internal pressure of the bag according to the direction of the arrow in FIG. 1, can be received in sealing sides A ₂₁ of the sealing portion A _2. Thus, note pressure on the outlet mounting portion 40, and in particular reduce the pressure exerted in the vicinity of both end portions X of the seal sides A _11, repeated vibrations due to occurring during transport, it is possible to prevent edge tear or the like.

  As shown in FIGS. 2 (a) and 2 (b), the spout mounting portion 40 of the spout 4 is a column having a convex lens shape and having a through hole 401 at the center, and has a plate at both ends. A rib 402 is provided. Normally, when the spout 4 is heat-sealed between the inner layer films 21 of the multiple film 2 by the spout attachment part 40, a gap is formed between the inner layer films 21 and the two regions surrounded by the end part of the spout attachment part 40. It is easy to become poorly sealed. In order to prevent this, plate-like ribs 402 are provided at both ends, and the plate-like ribs 402 are melted at the time of heat-sealing so that no gap is formed.

In this embodiment, as shown in FIG. 2A, the corners Y on both lower sides of the plate-like ribs 402 are stepped so as to be narrower than the width in the height direction of the spout attachment portion 40. T ₂ is provided. The stepped portion T _2, the spout 4 even out the resin reservoir such as PE (polyethylene) in the corner Y after bonding, corners Y is considered as not become sharp corners. Thereby, the edge cut | disconnection of the corner | angular part Y by the repetitive vibration etc. which arise during transport can be prevented like the above.

  As shown in FIG. 2A, the spout engaging portion 41 includes a cylindrical portion 411 having a substantially U-shaped cross section, and a flange portion 412 at the periphery of the upper end thereof. A plurality of openings may be formed at the bottom of the cylindrical portion 411. Thereby, ventilation | gas_flowing can be ensured between the packaging bag 1 with a spout, and the inside of an exterior container. That is, when fluid is pumped out during use, gas is sealed between the packaging bag with a spout 1 and the exterior container through this opening, so that pressure is applied from the outside of the packaging bag body 3 to the inside. The fluid can be pumped smoothly.

  The flange portion 412 is formed on the upper peripheral end of the substantially cylindrical protruding opening portion shorter than the dimension in the height direction of the spout engaging portion 41 formed in the outer container that accommodates the spout engaging portion 41 of the spout 4. The packaging bag 1 with a spout is supported in the outer container by contacting and locking (see FIG. 7).

  The spout 4 is preferably manufactured by an injection molding method. The resin used for this is not particularly limited as long as it is a resin that can be injection-molded. However, it is bonded to the resin constituting the inner surface of the inner layer film 21 of the multiple film 2 by heat bonding to form the packaging bag 1 with a spout. Therefore, although it is necessary to select appropriately according to the resin constituting the inner surface of the inner layer film 21, high density polyethylene that is usually rigid even at high temperatures and hardly embrittles at low temperatures is suitable.

<Packaging bag body>
Next, the multiple film 2 which comprises the packaging bag main body 3 is demonstrated. In this embodiment, the multiple film 2 includes at least an outer layer film 20 and an inner layer film 21. FIG. 3 shows an example in which the inner layer film 21 is a single layer, and FIG. 4 shows an example in which the inner layer film 21 has three layers.

<Outer layer film>
The outer layer film 20 may have either a single layer configuration or a multilayer configuration, but is excellent in mechanical toughness, flex resistance, puncture resistance, impact resistance, cold resistance, heat resistance, chemical resistance, and the like. Since performance and heat sealability with respect to the inner layer film 21 are required, a multilayer structure is preferable from the viewpoint of selection of materials and cost.

  Note that a single-layer structure may be used when the inner capacity of the packaging bag is small and the mechanical strength is not so required because the weight of the contents to be filled is small.

  In the present embodiment, the base layer 200 and the heat-adhesive resin layer 201 have a multilayer structure, and the base layer 200 is made of a resin such as polyester, polyamide, polypropylene, polyethylene, or polyacetal. A film can be used, and a stretched film stretched in a uniaxial direction or particularly in a biaxial direction is suitable, but the packaging bag 1 with a spout of the present invention is stored and transported in an outer container, In transportation, since the fluid content oscillates vigorously in the bag, it is necessary to prevent pinholes and cracks generated by the oscillation, and a biaxially stretched polyamide film is preferable. The thickness of the film may be a thickness that can be held to the minimum necessary with respect to strength, rigidity, etc. as a base material, and may be determined in consideration of cost and the like.

  Examples of the heat-adhesive resin layer 201 constituting the outer layer film 20 include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear) low-density polyethylene, polypropylene, and ethylene-α olefin copolymer. Polymers, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, ionomer resins, ethylene-acrylic acid copolymers, ethylene-methyl acrylate copolymers, ethylene-methacrylic acid copolymers, etc. Resins composed of more than that can be used, and can be appropriately selected and used depending on the type of fluid content, but in general, polyethylene is preferred because of its excellent low-temperature sealing properties, and further the molecular weight distribution is narrow. , Metalloce which is excellent in heat seal strength and has little influence on fluid content Using a catalyst polymerized linear (linear) low density polyethylene (described later detailed) is preferred.

  In addition, the outer layer film 20 may be provided with an intermediate layer between the base material layer 200 and the heat-adhesive resin layer 201 as necessary in order to impart gas barrier properties such as oxygen and water vapor. As a material constituting this intermediate layer, for example, a metal foil such as aluminum, iron, copper, tin, or a film such as polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyester, polyamide, Polyethylene, polypropylene, ethylene-propylene copolymer and other polyolefin films, vinyl alcohol, etc. films coated with polyvinylidene chloride, or deposition of inorganic substances such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide A layered film or the like can be used.

  This intermediate layer not only provides the above-mentioned gas barrier properties, but also functions such as mechanical toughness, bending resistance, puncture resistance, impact resistance, cold resistance, heat resistance, chemical resistance, etc. Can be granted. It may be used in combination with the above-described material imparting gas barrier properties and a film of polyolefin such as polyester, polyamide, polyethylene, polypropylene, and ethylene-propylene copolymer.

  Further, as the base material layer 200, a film obtained by applying polyvinylidene chloride to the above-described film or a film in which an inorganic vapor deposition layer such as silicon oxide, aluminum oxide, indium oxide, tin oxide, or zirconium oxide is formed may be used. .

  In addition, as a lamination method for laminating each layer of the outer layer film 20, for example, an anchor coating agent such as an organic titanate, a polyethyleneimine derivative, a silane coupling agent, or an isocyanate compound is applied and dried on one surface of the base material layer 200. After that, the heat-adhesive resin layer 201 may be laminated by heating and extruding with a T-die extruder, or the heat-adhesive resin layer 201 may be prepared in a film state and laminated by a sandwich lamination method. Further, a two-component curable polyurethane adhesive composed of a polyol component and an isocyanate component may be used for lamination by a known dry lamination method. As a matter of course, an easy adhesion treatment such as a corona discharge treatment, an ozone treatment, a plasma treatment or the like may be performed on a necessary surface of each layer as necessary.

<Inner layer film>
Next, the inner layer film 21 will be described. The inner layer film 21 may have a single-layer structure as shown in FIG. 3, or it is intended to prevent pinholes and cracks in cooperation with the outer layer film 20, or a packaging with a spout formed of the multiple film 2. A multilayer structure as shown in FIG. 4 may be used in order to improve the strength such as the tensile strength and heat seal strength of the bag 1 itself.

  In the case of a single layer configuration, the outer layer film 20 needs to be a resin that can be thermally bonded to the heat-adhesive resin layer 201, and may be appropriately selected and used depending on the type of resin used for the heat-adhesive resin layer 201. However, for the reason described in the heat-adhesive resin layer 201 of the outer layer film 20, polyethylene and further linear (linear) low-density polyethylene polymerized using a metallocene catalyst are preferable.

  As described above, the spout 4 is usually made of high-density polyethylene that is rigid even at high temperatures and hardly embrittles at low temperatures. In this sense, the thermal adhesiveness constituting the inner surface of the inner layer film 21 is also suitable. The resin layer is preferably polyethylene, and further linear (linear) low-density polyethylene polymerized using a metallocene catalyst.

  Linear (linear) low density polyethylene polymerized using a metallocene catalyst, that is, an ethylene-α-olefin copolymer polymerized using a metallocene catalyst is, for example, a combination of zirconocene dichloride and methylalumoxane. It is possible to use an ethylene-α-olefin copolymer obtained by copolymerizing ethylene and an α-olefin using a metallocene catalyst such as a catalyst obtained by combining alumoxane with a metallocene catalyst, that is, a metallocene catalyst. The above metallocene catalyst is also called a single-site catalyst because the current catalyst is called a multi-site catalyst with non-uniform active sites (below, the active sites are uniform). The metallocene catalyst has the same meaning as the single-site catalyst.) Specifically, as an ethylene-α / olefin copolymer polymerized using a metallocene catalyst, trade name “Kernel” manufactured by Mitsubishi Chemical Corporation, trade name “Evolue” manufactured by Mitsui Petrochemical Co., Ltd., Product name “EXACT” manufactured by EXXON CHEMICAL, USA, product name “AFFINITY” manufactured by DOW CHEMICAL, US, product name “ENGAGE”, etc. An ethylene-α-olefin copolymer polymerized using a metallocene catalyst can be used.

  The ethylene-α / olefin copolymer polymerized using the metallocene catalyst will be described in more detail. Specifically, for example, a catalyst comprising a combination of a metallocene-based transition metal compound and an organoaluminum compound, that is, a metallocene catalyst ( An ethylene-α-olefin copolymer obtained by copolymerizing ethylene and an α-olefin can be used. In addition, said metallocene catalyst may be supported and used for an inorganic substance. In the above, examples of the metallocene transition metal compound include a transition metal selected from group IVB, specifically, titanium (Ti), zirconium (Zr), hafnium (Hf), cyclopentadienyl group, substituted cyclohexane. 1 to 2 pentadienyl group, indenyl group, substituted indenyl group, tetrahydroindenyl group, substituted tetrahydroindenyl group, fluoronyl group or substituted fluorenyl group are bonded, or two of these groups are shared Those bonded by bonding are bonded, and in addition, hydrogen atom, oxygen atom, halogen atom, alkyl group, alkoxy group, aryl group, acetylacetonate group, carbonyl group, nitrogen molecule, oxygen molecule, Lewis base, silicon atom Having a substituent such as an unsaturated hydrocarbon or a substituent containingIn the above, as the organoaluminum compound, alkylaluminum, chain-like or cyclic aluminoxane, or the like can be used. Here, as the alkylaluminum, for example, triethylaluminum, triisobutylaluminum, dimethylaluminum chloride, diethylaluminum chloride, methylaluminum dichloride, ethylaluminum dichloride, dimethylaluminum fluoride, diisobutylaluminum hydride, diethylaluminum hydride, ethylaluminum sesquichloride. Etc. can be used. The chain or cyclic aluminoxane can be produced, for example, by bringing alkyl aluminum into contact with water. For example, it can be produced by adding alkylaluminum at the time of polymerization and adding water later, or by reacting crystallization water of a complex salt or adsorbed water of an organic / inorganic compound with alkylaluminum. Next, in the above, as the inorganic material for supporting the metallocene catalyst, for example, silica gel, zeolite, silicon earth or the like can be used.

Next, in the above, as the polymerization method, for example, various polymerization methods such as bulk polymerization, solution polymerization, suspension polymerization, and gas phase polymerization can be used. In addition, the polymerization may be any method such as a batch method or a continuous method. In the above, the polymerization conditions are polymerization temperature, −100 to 250 ° C., polymerization time, 5 minutes to 10 hours, reaction pressure, normal pressure to 300 Kg / cm ² . Furthermore, in the present invention, examples of the α-olefin that is a comonomer copolymerized with ethylene include propylene, 1-butene, 3-methyl-1-butene, 4-methyl-1-pentene, 1-hexene, 1 -Octene, decene, etc. can be used. The above α · olefin fin may be used alone or in combination of two or more. Moreover, the mixing ratio of the above-mentioned α · olefin fin is, for example, 1 to 50% by weight, preferably 10 to 30% by weight. In the present invention, the physical properties of the ethylene-α / olefin copolymer polymerized using the above metallocene catalyst are, for example, molecular weight, 5 × 10 ^{3 to} 5 × 10 ⁶ , density, 0.890 to 0.930 g / cm. ^3. Melt flow rate [MFR], 0.1-50 g / 10th order. In the present invention, the ethylene-α / olefin copolymer polymerized using the above metallocene catalyst includes, for example, an antioxidant, an ultraviolet absorber, an antistatic agent, an antiblocking agent, a lubricant (fatty acid amide, etc.). ), Flame retardants, inorganic or organic fillers, dyes, pigments and the like can be optionally added and used.

  As shown in FIG. 4, the inner layer film 21 may have a three-layer structure (five layers including an adhesive layer (not shown) to be described later) in which the core layer 210 and both surfaces thereof are the heat-adhesive resin layers 211. In this case, the core layer 210 is excellent in mechanical toughness, bending resistance, puncture resistance, impact resistance, cold resistance, heat resistance, chemical resistance, etc., like the base layer 200 of the outer layer film 20. And a layer made of a resin such as polyester, polyamide, polypropylene, polyethylene, polyacetal, or the like. Further, it may be unstretched or may be a layer made of a resin stretched in a uniaxial direction or a biaxial direction. However, like the base material layer 200 of the outer layer film 20, it is preferably a layer made of polyamide. In particular, a configuration in which the heat-adhesive resin layer 211 is provided on both sides of the polyamide layer is particularly preferable.

  As the heat-adhesive resin layer 211 provided on both surfaces of the core layer 210, one can be thermally bonded to the heat-adhesive resin layer 201 of the outer film 20, and the other is the spout 4 and the heat made of the above-described high-density polyethylene. It is premised that it is made of a resin that can be bonded, and polyethylene is suitable for the reason explained in the heat-adhesive resin layer 201 of the outer layer film 20, and moreover, a polymer that has been polymerized using the above metallocene catalyst. Most preferred are linear (linear) low density polyethylene.

  As a method for laminating the inner layer film 21 in the case of a multilayer structure, each layer may be laminated by the laminating method described for the outer layer film 20, but for reasons such as making the manufacturing cost inexpensive, five layers are possible. It is preferable to laminate by using a co-extrusion method capable of laminating (thermal adhesive resin layer 211 / adhesive layer / core layer 210 / adhesive layer / thermal adhesive resin layer 211) at a time.

  When the heat-adhesive resin layer 211 is a polyolefin represented by polyethylene or polypropylene, the adhesive layer is a polyolefin graft-modified with an unsaturated carboxylic acid, such as Admer [Mitsui Petrochemical Co., Ltd .: trade name], Modic [Mitsubishi Chemical Co., Ltd .: trade name], Polytack [Idemitsu Petrochemical Co., Ltd .: trade name] can be suitably used.

<Other configurations>
Although not shown, in the present invention, an intermediate layer film may be provided between the outer layer film 20 and the inner layer film 21 to form a multiple film 2 having three or more layers. As an intermediate | middle layer film, it is provided according to the physical property calculated | required by the packaging bag 1 with a spout, for example, the single layer which consists of resin demonstrated with the thermoadhesive resin layer 201 of the outer layer film 20 shown in FIG. May be used, or may be made of a structure in which the heat-adhesive resin layer 201 is laminated on the surface of the outer layer film 20 on which the base material layer 200 is exposed. The inner layer film 21 shown may have the layer configuration described above. In any case, it is preferable that the thermoadhesive resin layers facing each other of the outer layer film 20, the intermediate layer film, and the inner layer film 21 are a combination of resins that can be thermally bonded to each other.

  In addition, if the film which comprises the packaging bag main body in this invention is the structure in which innermost surfaces can be heat-sealed, it does not necessarily need to be a multiple film, for example, the normal structure using only one pair of outer layer films 20 It may be.

  Further, as the spout 4 and the inner layer film 21, in addition to the above high-density polyethylene, for example, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer having heat resistance, chemical resistance, non-adhesiveness, and excellent low-temperature characteristics. Fluorine resins such as coalescence (hereinafter abbreviated as PFA) and polytetrafluoroethylene (hereinafter abbreviated as PTFE) may also be used. In this case, it is preferable to use a PTFE film for the multiple film 2 constituting the packaging bag body 3.

<How to use>
As shown in FIG. 7 (a), the packaging bag 1 with a spout of the present invention is inserted into the outer container 5 from the opening 51 of the outer container 5, and the spout as shown in FIG. 7 (b). 4 is attached to the opening 51 of the outer container 5. At this time, the opening 51 of the outer container 5 has a substantially cylindrical protruding shape that is shorter than the height dimension of the spout engaging portion 41, and the flange portion 412 of FIG. By contacting the peripheral end, the spout-equipped packaging bag 1 is supported in the outer container.

  Thereafter, in this state, the fluid as the content is introduced from the spout 4 by a predetermined method, and finally, for example, the opening 51 is sealed, and the spout 4 can be sealed and fixed. By covering with a material (not shown), the outer container 5 can be circulated and transferred.

  When the fluid is used, that is, when the fluid is pumped out, the fluid can be pumped out from the spout 4.

  As described above, the packaging bag with a spout of the present invention is accommodated in an outer container, and is used for storage and transportation of fluid contents in the industrial chemical field, the pharmaceutical and cosmetic raw material fields, and the like. Among them, a resist container that is repeatedly transferred between a resist manufacturer and a device manufacturer such as a semiconductor is required to have high strength and hygiene, and the transfer form varies from about 1 L to about 250 L. It is necessary to cope with the capacity.

  In this respect, the packaging bag with a spout of the present invention can appropriately cope with variations in various capacities by appropriately selecting an outer container and an inner layer container. In addition, since it can be easily attached to and detached from the exterior container, it is excellent in workability and hygiene.

  Examples of the outer container 5 include, but are not limited to, a rigid container made of paper such as metal, synthetic resin, and cardboard.

  EXAMPLES Next, although an Example is given and this invention is demonstrated in more detail below, this invention is not limited to these Examples.

  As the structure of the packaging bag used in the examples and comparative examples described below, as the outer layer film, an ON (biaxially stretched polyamide) film 25 μm / urethane adhesive 3 μm / LLDPE film 40 μm is used as an inner layer film. A five-layer coextruded film consisting of LLDPE layer 25 μm / adhesive layer 10 μm / nylon layer 15 μm / adhesive layer 10 μm / LLDPE layer 20 μm was used. In addition, as the LLDPE film of the outer layer film, a linear low density polyethylene film (“SR-UEN” manufactured by DNP Techno Film Co., Ltd.) polymerized using a metallocene catalyst was used. In addition, as the LLDPE layer of the inner layer film, a linear low density polyethylene resin polymerized using a metallocene catalyst (UBE super polyethylene “Umerit” manufactured by Ube Industries, Ltd.) was used.

[Example 1]
The inner dimension shown in FIG. 1 is composed of a double film attached by heat-sealing a high-density polyethylene outlet on one short side so that the LLDPE layer having a thickness of 25 μm of the inner layer film is on the contents side. A packaging bag with a spout of a 380 mm × 715 mm four-sided seal type was produced. The flange outer diameter of the spout engaging portion of the high density polyethylene spout is 53.9 mm, the thickness of the flange is 2.5 mm, and the outer diameter of the spout engaging portion immediately below the flange is 50.8 mm. The height of the spout engaging portion is 32 mm.

[Comparative Example 1]
Heat seal at the bottom mounting ring through the high-density polyethylene spout through the hole on the short side so that the 25 μm thick LLDPE layer of the inner layer is on the contents side. A packaging bag with a spout as a comparative example 1 of a four-sided seal type with an inner dimension of 380 mm × 715 mm shown in FIG. The outer diameter of the flange part of the high-density polyethylene outlet is 53.9 mm, the thickness of the flange part is 2.5 mm, the outer diameter just below the flange part is 50.8 mm, and the length between the flange part and the bottom mounting ring is 25 mm.

  The packaging bag with spouts of Example 1 and Comparative Example 1 produced above has a thread bottom on the bottom surface of a substantially cylindrical shape having a diameter of 227.6 mm and a height of 500 mm, and an inner diameter of 50.8 mm at the center of the top surface. Inserted from a cylindrical opening of a stainless steel container having a cylindrical opening with a protruding length of 15.0 mm, and set the flange part in contact with the upper peripheral surface of the cylindrical opening, 18 L of water was poured from the spout, and the cylindrical opening was appropriately sealed with sealing means to prepare 10 containers each for a drop test.

  The container prepared above was dropped once from the height of 70 cm in the order of the vertical direction and the horizontal direction, and the presence / absence of water leakage and the broken bag were visually confirmed. Table 1 shows the results.

  As is clear from Table 1, the packaging bag in which the spout is attached to the heat seal portion on one side of Example 1 has a drop impact compared to the packaging bag in which the spout is attached to the position on the short side of Comparative Example 1. It was possible to obtain a packaging bag that is strong against damage and does not have a risk of bag breakage due to drop impact.

[Comparative Example 2]
The packaging bag of the following structure used conventionally is set as the comparative example 2, and the packaging bag of Example 1 and the comparative example 2 examined the physical property of the packaging bag, the cleanliness, and the degree of leaching of particles. The structure of the conventional packaging bag is as follows: the outer layer film is a three-layer coextruded film of PE15 μm / PE35 μm / PE20 μm, and the inner layer film is a five-layer film of LLDPE15 μm / PE10 μm / NY20 μm / PE10 μm / PE10 μm (content side is LLDPE). Heavy film configuration.

  For Example 1 and Comparative Example 2 prepared above, the sealing strength of the heat seal portion of the packaging bag, the adhesive strength between the spout and the packaging bag, the puncture strength and gel resistance of the packaging bag, and the particles were measured, and Table 2 It was shown to. In addition, when the packaging bag is filled with a chemical solution, the amount of minute impure solids in the chemical solution, the amount of water, the amount of metal impurities eluted, the amount of ionic components, the amount of non-volatiles, changes in the viscosity of the chemical solution over time, and the chemical solution after a predetermined time has elapsed The film thickness of the coating film formed during the measurement was measured and the results are shown in Table 3. Various strengths and other measurements were measured by the following methods. Moreover, a photoresist composition (trade name: TFR-790PL, manufactured by Tokyo Ohka Kogyo Co., Ltd.) was used as the chemical solution.

<Measurement of seal strength>
A tensile test specimen having a width of 15 mm was collected from a substantially central portion of the remaining heat seal portion other than the heat seal portion fused to the spout of the packaging bag, and measured according to JIS-Z1707. Incidentally, a portion was collected specimen was _{B 1,} B 2, _{B 3} shown in FIG.

<Measurement of adhesive strength between spout and packaging bag>
From the portion where the spout and the bag were fused, a test specimen was sampled with a width of 15 mm as shown by the dashed line X in FIGS. 5 and 6 and measured according to JIS-Z1707. FIG. 5 is a diagram showing a location where the test piece is collected in the example, and FIG. 6 is a diagram showing a location where the test piece is collected in the comparative example.

<Measurement of puncture strength>
Measured according to Ministry of Health and Welfare Notification No. 20, “Testing methods for instruments or containers and packaging in general” in 1982. It measured from the inner layer side and the exterior side in the state which accumulated the inner layer film and the outer layer film.

<Measurement of gel resistance>
A gelbo test (tester: gelboflex tester) was performed in a state where the inner layer film and the outer layer film were overlapped, and the number of pinholes in each of the inner layer film and the outer layer film was counted after 1000 times and 2000 times of gelbo. The test was conducted in an environment of normal temperature and normal humidity.

<Measurement of particles>
Put ultrapure water into the sample, shake gently for 10 seconds so that the ultrapure water spreads in the bag, and then let stand for 20 minutes. The liquid subjected to the treatment was measured with a liquid particle counter.

<Measurement of amount of minute impure solids in chemical solution>
The number of particles was measured using a particle counter (manufactured by Rion, product name: Particle Sensor KS-41).

<Measurement of water content in chemicals>
Measured with a Karl Fischer moisture meter.

<Measurement of metal impurity elution amount, ionic component amount, and nonvolatile content in chemical solution>
The amount of metal impurities eluted was measured with an ICP emission spectrophotometer. The amount of ionic components was measured by ion chromatography. The non-volatile content is the rate of increase in weight after evaporation relative to the initial value.

<Measurement of viscosity of chemical solution>
Measured with a Cannon Fenceke viscometer.

<Measurement of coating film thickness>
The film thickness of a coating film formed by spin coating (3000 rpm) on a 6-inch silicon wafer and drying on a hot plate at 190 ° C. for 90 seconds was measured.

  As shown in Table 2, the packaging bag of Example 1 was compared with the packaging bag of Comparative Example 2 in all of the sealing strength of the heat seal part, the adhesive strength between the spout and the packaging bag, and the puncture strength of the packaging bag. Excellent results. In addition, the number of pinholes and the number of particles were small.

  Further, even when the chemical solution is filled as shown in Table 3, Comparative Example 2 shows any change in the particle, metal impurity elution, ionic component, non-volatile content leaching degree, chemical solution viscosity, and water content in the chemical solution. It was almost equivalent.

  From these results, the packaging bag of the present invention is excellent in mechanical strength, hardly breaks when storing, transporting and handling the contents such as a resist solution, and leaching of particles and the like into the chemical solution. It was confirmed that there were few.

It is a top view which shows one Embodiment of the packaging bag with a spout which concerns on this invention. It is a figure which shows the spout of the packaging bag with a spout by the said embodiment, Comprising: (a) is a longitudinal cross-sectional view of a spout, (b) is the bottom view seen from the spout attachment part side of a spout. It is a schematic diagram which shows the layer structure which shows one Example of the multiple film used for the packaging bag with a spout by the said embodiment. It is a schematic diagram which shows the layer structure which shows the other Example of the multiple film used for the packaging bag with a spout by the said embodiment. It is a figure which shows the extraction | collection site | part of the test body for sealing strength measurement of the packaging bag with a spout of an Example. It is a figure which shows the extraction | collection site | part of the test body for sealing strength measurement of the packaging bag with a spout of a comparative example. It is a figure which shows the accommodation state to the exterior container of the packaging bag with a spout by the said embodiment, (a) is a fragmentary perspective view which shows the state which inserts the packaging bag with a spout into an exterior container, (b) is an exterior container. It is a fragmentary perspective view which shows the state after the packaging bag with a spout was accommodated in. It is a perspective view which shows one Example of the conventional packaging bag with a spout.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packing bag with spout 2 Multiplex film 3 Packaging bag main body 4 Spout 10 Heat seal part 20 Outer film 21 Inner film 40 Spout attachment part 41 Spout engagement part 201, 211 Thermal adhesive resin layer 210 Core layer 401 Through Hole 402 Plate-like rib 411 Tubular part 412 Flange part

Claims (15)

A packaging bag with a spout used as an inner bag of an outer container, the spout being joined to the packaging bag body,
The packaging bag body can be stored in an outer container, and the spout is detachable from the opening of the outer container,
The packaging bag body is formed into a bag body by forming a heat seal portion on the outer periphery of at least two or more films, and at a predetermined position of the heat seal portion, between the sealing surfaces of the heat seal portion. A packaging bag with a spout where a part of the spout is joined.   The packaging bag with a spout according to claim 1, wherein the spout is configured to be able to support the packaging bag body by being engaged with an opening of the outer container.   The packaging bag with a spout according to claim 1 or 2, wherein the spout is made of a synthetic resin that can be thermally bonded on the sealing surface.   The packaging bag with a spout according to any one of claims 1 to 3, wherein a part of the spout includes a spout attachment portion that can be surface-bonded to the seal surface.   The packaging bag with a spout according to claim 4, wherein the spout attachment portion capable of surface joining forms a column having a convex lens shape as a whole, and a side surface of the column is a joining surface.   6. The spout according to claim 5, wherein plate-shaped rib portions are formed extending from both end portions of the convex lens-shaped column bodies before the joining, and the joining is performed including the rib portions. Packing bag with.   The packaging bag with a spout according to any one of claims 1 to 6, wherein the spout is polyethylene, and the sealing surface of the packaging bag body is polyethylene.   The packaging bag with a spout according to claim 7, wherein the polyethylene on the sealing surface is a linear low density polyethylene polymerized by a metallocene catalyst.   The packaging bag with a spout according to any one of claims 1 to 6, wherein the spout is made of a fluororesin, and the sealing surface of the packaging bag body is made of a fluororesin.   The packaging bag body is formed by stacking multiple films in which at least an outer layer film and an inner layer film are overlapped so that the inner layer films face each other to form a heat seal portion on the outer periphery. Packaging bag with spout as described.   The packaging bag with a spout according to claim 10, wherein the inner layer film is a co-extruded film in which a polyamide layer is used as a core layer and a thermoadhesive resin layer is formed on both surfaces of the core layer via an adhesive layer.   The packaging bag with a spout according to claim 10 or 11, wherein the outer layer film is a laminated film in which a heat-adhesive resin layer is formed on one surface of a biaxially stretched polyamide film via an adhesive.   The packaging bag with a spout according to any one of claims 1 to 12, wherein the packaging bag body is formed such that a corner portion of an inner edge of the heat seal portion is formed in an arc shape.   The packaging bag with a spout according to any one of claims 1 to 13, which is used to contain a resist solution.   The packaging bag with a spout according to claim 14, wherein a volume capacity of the resist solution is 1L or more and 250L or less.

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