JP4807034B2 - Steam vent packaging bag - Google Patents

Description

  The present invention relates to a packaging bag. More specifically, the present invention relates to a heating method for heating a packaged food packaged with a cooked or semi-cooked food and sealed in a cooking machine such as a microwave oven. Standing pouch type for heating microwave ovens that can reliably and easily release vapors such as water vapor inside the pressurized packaging bag with the vapor venting means formed in the packaging bag. This relates to a steam vent packaging bag.

  In recent years, pouches for microwave ovens have been produced and used in large quantities due to the development of food processing technology and packaging technology and the spread of microwave ovens.

  Here, the microwave oven vibrates water molecules contained in the food by irradiation with high frequency (ultra-high frequency), and heats the food with frictional heat generated by the vibration of the water molecules. Water vapor is generated along with the high-frequency heating by the microwave oven, and the normal sealed bag formed of the plastic film expands and bursts due to the water vapor.

  Therefore, in a conventional microwave oven pouch, in order to discharge water vapor generated inside the bag by high-frequency heating of the microwave oven to the outside of the bag, a part of the pouch body is opened during heating, or an escape hole is provided in the pouch body. Or open the water vapor adjusting hole and seal the water vapor adjusting hole with an adhesive seal and peel off the seal before heating, or if the vapor pressure in the pouch body increases by heating, Whether to open or to open the valve.

  However, among the above-mentioned microwave oven pouches, those that open a part of the pouch body before putting it in the microwave oven require time and effort to open the pouch body. In other words, the stored contents always come into contact with the outside air, which leaves problems in storage and distribution. In addition, if the seal is peeled off before heating, the seal part is usually one place, so there may be insufficient water vapor removal, and there is a hygiene problem because the adhesive on the seal part touches the food. There is also a drawback that a special machine for applying the seal is required. On the other hand, in the case where the seal portion is opened by the vapor pressure, it is difficult to adjust the sticking strength of the seal, and the seal portion may be opened in the distribution stage. Furthermore, if the valve opens, a separate valve must be prepared and attached.

  Such a heated cooking packaged food is heated by a microwave oven so that the packaging bag ruptures due to the internal pressure such as vapor pressure generated from the food during heating, the contents are scattered, and the inside of the microwave oven is not contaminated. It was necessary to vent a steam by cutting out a part of the bag with scissors or opening a vent hole, which was troublesome and troublesome.

  For this purpose, for example, as shown in FIG. 18, the laminated film 29 is formed into a cylindrical shape, and the same surface side of the opposite end portions 30 of the film is overlapped with each other in the shape of a palm, and as shown in FIG. The mating surfaces are formed in an easy-peeling region in a partial region over the entire length in the longitudinal direction, joined by heat sealing, a heat seal portion 30 having a predetermined width is provided to form a cylinder, and the heat After the seal part 30 is shifted to one end side of the cylindrical body, the bottom side part of the cylindrical body is heat sealed by excluding the lower side part of the cylindrical body, and the bottom heat seal part 31 is provided to make a bag. The contents are filled from the opening on the upper side of the body, and then, as shown in FIG. 20, the upper side of the cylindrical body is heat-sealed except for the upper side of the heat-sealing part 31, and the upper heat sealing part 32 is provided. Proposed packaging bag 34 sealed and sealed Are (see Patent Document 1).

  In the packaging bag 34 shown in FIG. 20, when the vapor pressure inside the bag rises due to heating, the easy peeling region provided in a partial region of the heat seal part 30 peels and releases the vapor, and the vapor pressure is released. There is something that can perform pressure.

Patent literature is described below.
JP-A-9-150864

  However, even if such a packaging bag is adopted, when the situation after heating is viewed, the content is scattered in an easy peeling region provided in a partial region of the heat seal portion 30 of the packaging bag 34. In such a state, it is difficult to say that the contents can be prevented from scattering and the inside of the microwave oven can be avoided.

  The present invention has been made in order to solve the above-described problems, and is used when heating a packaged food or the like filled with a cooked or semi-cooked food and sealed in a cooking machine such as a microwave oven. In addition, gas such as water vapor inside the packaging bag that has been pressurized with heating can be reliably, easily and stably released, and the surroundings of the bag and the inside of the microwave oven are not contaminated. It is an object of the present invention to provide a steaming packaging bag in the form of a standing pouch for heating.

To achieve the above objectives, ie
The invention according to claim 1 is bag-made using a laminated film having at least an outer surface side of a base film and an inner surface side of a sealant layer,
Both side edges of the side film on the two sides of the bag body are heat-sealed to form body side edges seals,
The bottom of the bag is a gusset-folded fold formed by folding the film inwardly in a V shape,
A standing pouch-type steam release packaging bag for heating a microwave oven in which a bottom seal portion capable of standing on the bottom side is formed,
The inner fold portion and the outer fold portion of the gusset fold formed by folding the film inwardly in a V shape at a predetermined position on the front surface of one of the two side films of the body portion are substantially parallel to the opening portion of the bag body. Forming a fin-like fold in the bag width direction,
A patterned heat seal part provided with a non-seal part having a steam vent as a steam vent means is provided continuously at least at a predetermined position of the bag body part one side edge part to the body side edge seal part,
A non-sealing portion of the pattern heat seal portion is provided in the vicinity of the upper end of the fin portion of the fin-shaped folding portion, and the pattern heat seal portion is provided.
Further, an easily peelable tape material or an easily peelable layer having a predetermined width in the width direction of the bag is formed on the inner surface of the two side films forming the bag body so as to contact the fin-like folded portion and the steam vent. It consists of a configuration provided with intervening,
When the food bag is sealed and packaged, and the inside of the bag reaches a predetermined internal pressure during heating or cooking with a microwave oven, the fin-shaped folded portion expands due to an increase in internal pressure, and the fin upper end and the pattern-shaped heat seal portion The pressure inside the bag is concentrated at the position where the crossing and the non-sealed portion of the pattern-shaped heat seal portion, the seal retreat surely occurs, and has a steam venting function capable of stably releasing the steam inside the bag. It is the steam release packaging bag characterized.

The invention according to claim 2
The steam vent as the steam vent means is a steam vent comprising a through hole or a slit-like hole in the non-sealed portion of the patterned heat seal portion having a non-sealed portion. It is a steam vent packaging bag.

The invention according to claim 3
The steam vent as the steam vent means is a steam vent in which the non-sealed portion of the patterned heat seal portion having a non-sealed portion extends to the edge on the side of the body portion. It is a steam vent packaging bag.

The invention according to claim 4
The easy-peeling tape material is composed of an adhesive resin layer and an easy-adhesive resin layer, and the easy-peeling tape material is opposite to the side film provided with the fin-like folds in the two side films of the bag body. The steam-extracting packaging bag according to any one of claims 1 to 3, wherein the packaging film is attached to the inner surface of the side film via the adhesive resin layer.

The invention according to claim 5
The easy-peeling tape material is composed of an adhesive resin layer and an easy-adhesive resin layer, and the easy-peeling tape material is the fin of the side film provided with the fin-like folds in the two side films of the bag body. Any one of claims 1 to 3, wherein the adhesive resin layer is attached to the inner surface of a side film that is partially sandwiched between the fold-like folds and provided with fin-like folds. It is a steam release packaging bag described in the item.

The invention according to claim 6
The said easily peelable layer is formed in the inner surface of the side film opposite to the side film which provided the said fin-shaped folding part among the two side films of a bag trunk | drum. 4. The steam-extracting packaging bag according to any one of 3 above.

<Action>
The standing pouch-type steam release packaging bag for heating a microwave oven according to the present invention is an inner side of a gusset fold formed by folding a film in a V shape inward at a predetermined position on the front surface of one of the side films of the bag body. A pattern-shaped heat seal in which the folding part and the outer folding part form a fin-like folding part extending in the bag width direction substantially parallel to the opening part of the bag body and provided with a non-sealing part having a steam vent as a steam venting means Is provided at a predetermined position on at least one side edge of the bag body portion, and is continuously provided on the both side edge seal portions of the body portion, and the bag body portion is provided so as to partially contact the fin-like folding portion and the steam vent. Since the inner side of the side film to be formed is provided with an easy-peeling tape material or an easy-peeling layer with a predetermined width across the width of the bag, it is sealed and packed with cooked or semi-cooked foods. Package When a food item is heated in a cooking machine such as a microwave oven, the fin-like folding part expands due to an increase in the internal pressure when the bag reaches a predetermined internal pressure due to a gas such as water vapor generated from the contents of the food item. However, the pressure inside the bag is concentrated at the position where the upper end of the fin portion and the pattern-shaped heat seal portion cross each other, and the seal retreat occurs reliably and easily to the non-sealed portion of the pattern-shaped heat seal portion. Water vapor can be released stably.

  According to the present invention, when heating or cooking in a cooking machine such as a microwave oven, gas such as water vapor in the bag generated from the contents such as food can be reliably and easily released stably. Further, it is possible to provide a standing pouch-type steam release packaging bag for heating a microwave oven in which the surroundings of the bag and the inside of the microwave oven are not soiled.

  Moreover, since the direction of the top | upper surface used as the opening part which takes out the contents differs from the direction of a steam vent, the steam-extracting packaging bag of this invention does not touch a vapor | steam at the time of content extraction, and is safe.

  In addition, since the steam release packaging bag of the present invention can reliably and easily release steam, it is not necessary to cut out a part of the bag with scissors or the like, and there is no need for trouble and trouble of steam release. .

  Furthermore, since the steam release packaging bag of the present invention has a configuration that can change the seal width or can have an irregular seal (pattern seal), it is not hot even if it is held with bare hands, and can be a safe packaging bag. .

  Hereinafter, an embodiment as an example of the present invention will be described with reference to the drawings. FIG. 1: is a top view (a) which shows an example of the steam release packaging bag of this invention, and a schematic cross section (b) of the XX 'direction in the top view. FIG. 2: is a top view (a) which shows the other example of the steam release packaging bag of this invention, and a schematic cross section (b) of the XX 'direction in the top view. FIG. 3: is a top view (a) which shows another example of the steam release packaging bag of this invention, and a schematic cross section (b) of the XX 'direction in the top view. FIG. 4: is a top view (a) which shows another example of the steam release packaging bag of this invention, and a schematic cross section (b) of the XX 'direction in the top view. FIG. 5 shows a notch for forming an opening by cutting in the steam release packaging bag of the present invention, punch holes at predetermined positions on both side edges of the bag bottom, and two side surfaces of the bag body. It is a schematic top view which shows the example which provided the melt | fusion part which melt | fused the sealant layers of the both-sides edge part of a film in substantially semicircle shape. FIG. 6 is a plan view (a) of the steam-release packaging bag of the present invention sealed and packaged with contents such as cooked or semi-cooked food, and a schematic cross-sectional view in the XX ′ direction in the plan view. (B). FIG. 7 shows an example of the inside of a package generated by heating in a cooking machine such as a microwave oven in an example of a steam-release packaging bag of the present invention that is sealed and packed with contents such as cooked or semi-cooked food. A plan view (a) as an explanatory diagram for releasing a gas such as water vapor, a schematic sectional view in the XX 'direction in the plan view (b), and a schematic sectional view in the YY' direction in the plan view (b) It is. FIG. 8 shows another example of the steam release packaging bag of the present invention which is sealed and packed with contents such as cooked or semi-cooked food, and the packaging generated by heating in a cooking machine such as a microwave oven. A plan view (a) as an explanatory diagram for releasing a gas such as water vapor inside the body, a schematic cross-sectional view in the XX ′ direction in the plan view (b), and a schematic cross-sectional view in the YY ′ direction in the plan view ( b). FIG. 9 is a schematic cross-sectional view showing an example of a laminated film constituting a bag in the steam-free packaging bag of the present invention. FIG. 10 is a schematic cross-sectional view showing another example of a laminated film constituting a bag in the steam-free packaging bag of the present invention. FIG. 11: is a schematic cross section which shows an example of the gas barrier laminated film used for the laminated film which comprises the bag in the steam release packaging bag of this invention. FIG. 12 is a schematic cross-sectional view showing another example of a laminated film constituting a bag in the steam-free packaging bag of the present invention. FIG. 13: is a schematic cross section which shows an example of the easily peelable tape material used for the steam release packaging bag of this invention. 14-17 is a schematic diagram explaining an example of the manufacturing method of the steam release packaging bag of this invention. 18 to 20 are schematic perspective views for explaining an example of a conventional steam-release packaging bag.

As shown in FIG. 1, the steam-extracting packaging bag as an example of the present invention is formed using at least a laminated film (1) having a base film on the outer surface side and a sealant layer on the inner surface side. Both side edges of the side film (1, 1) of the surface are heat-sealed to form body side edge seals (9, 9), and the bag bottom is a gusset formed by folding the film inward in a V shape A standing pouch-type steam release packaging bag for heating a microwave oven in which a folded portion of the fold forms a bottom portion (4) and a bottom seal portion (10) capable of standing on the bottom side is formed,
The inner fold portion and the outer fold portion of the gusset fold formed by folding the film in a V shape inwardly at a predetermined position on the front surface of one of the two side films (1, 1) of the body portion are formed on the bag body. A fin-like fold-in part (3) extending in the bag width direction is formed substantially parallel to the opening part (5), and steam is continuously removed from at least one bag side edge to the body side edge seal part (9). As a means, the non-sealed portion (7) of the pattern-shaped heat seal portion having a through hole (8) serving as a vapor outlet in the substantially triangular non-sealed portion (7) of the fin-like folded portion (3) A pattern-shaped heat seal portion is provided at a predetermined position so as to be located near the upper end (3a) of the fin portion, and partly abuts on the fin-shaped fold portion (3) and the through hole (8) serving as a steam outlet. In addition, from the adhesive resin layer and the easily adhesive resin layer of a predetermined width across the width direction of the bag The easy-release tape material (2) is placed on the inner surface of the side film opposite to the side film provided with the fin-like folding part (3) among the two side films on the bag body. The heat-sealed pattern-shaped heat seal portion (6) is interposed between the inner surfaces of the two side films (1, 1) that form the bag body, and is cooked or semi-cooked. When a packaged food that has been filled and sealed with food, etc. is heated or cooked in a cooking machine such as a microwave oven, the inside of the bag reaches a predetermined internal pressure due to gas such as water vapor generated from the contents of the food. Sometimes, the fin-like folding part (3) expands due to an increase in internal pressure, and the bag internal pressure is concentrated at the position (6a) where the fin upper end (3a) and the pattern-like heat seal part (6) intersect. Heat seal (6) sea Gas such as water vapor inside the bag is passed through the through-hole (8) which is reliably and easily communicated to the non-sealed portion (7) and is provided in the non-sealed portion (7). It is a steam release packaging bag (A) characterized in that it escapes stably.

  A thin slit-like hole may be used instead of the through hole (8) serving as the vapor outlet, and the internal pressure can be stably and smoothly extracted by three-dimensionally expanding the opening diameter of the hole by the internal pressure. . Moreover, the shape of the pattern-shaped heat seal part which has a non-seal part is not specifically limited.

Moreover, as shown in FIG. 2, the steam release packaging bag as another example of the present invention is an easy release tape material (including an adhesive resin layer and an easily adhesive resin layer) in the steam release packaging bag (A). 2)
Of the two side films of the bag body part, the adhesive film is bonded to the inner surface of the side film provided with a fin-like fold part by being sandwiched in part by the fin-like fold part of the side film provided with the fin-like fold part. Steam-wrapping packaging bag having a configuration in which it is interposed on the inner surface of the two side films (1, 1) that are heat-sealed by the patterned heat-sealing portion (6) to form the bag body portion through the conductive resin layer (B).

Moreover, as shown in FIG. 3, the steam release packaging bag as another example of the present invention does not use the easy release tape material (2) in the above steam release packaging bag (A). 1a) is a steam-extracted packaging bag (C) formed on the inner surface of the side film opposite to the side film provided with the fin-like folding part (3) of the two side films of the bag body. ).

  Furthermore, as shown in FIG. 4, the steam release packaging bag as another example of the present invention has a substantially triangular non-seal portion (7) as a steam release means in the steam release packaging bag (A). Instead of the patterned heat seal part (6) having a through hole (8) serving as a steam outlet, a substantially rectangular non-seal part (12) extends to the edge of the body part side as a steam release means. The non-seal part (12) itself serves as a steam vent, and the easy-release tape material (2) comprising an adhesive resin layer and an easy-adhesion resin layer in the fin-like folded part (3) The adhesive resin layer is formed on the inner surface of the side film provided with the fin-like folds by being partially sandwiched by the fin-like folds of the side film provided with the fin-like folds of the two side films. Through the heat sink at the patterned heat seal part (6). A le has been two sides of the side films forming the Fukurodo portion (1,1) constituting the vapor release packaging bag which is interposed on the inner surface of the (D).

The non-sealed portion (12) of the substantially rectangular shape as the steam venting means extends to the edge of the body side, and the non-sealed portion (12) of the pattern-shaped heat seal portion (itself) becomes the steam vent ( 12) The pattern-shaped heat seal portion is continuous with at least the bag-side peripheral edge portion of the fin-like folded portion (3) in the vicinity of the upper end (3a) of the fin portion, and is continuous with the body side edge seal portions (9). Generated from the contents of food, etc. when heated or cooked in a microwave oven or other cooking machine. When the inside of the bag reaches a predetermined internal pressure due to a gas such as water vapor, the fin-shaped fold portion (3) expands due to an increase in internal pressure, and the fin upper end (3a) and the patterned heat seal portion (11) Crossing position ( In 1a), the pressure inside the bag is concentrated and the pattern-like heat seal part (11) is retracted to the non-seal part (12). The part (12) itself becomes a steam vent and gas such as water vapor inside the bag can be stably released.

  In addition, as shown in FIG. 5, the above-mentioned steam-free packaging bag is usually provided with easy-cut means such as a notch (13) for cutting the packaging bag to form an opening, on the body side near the opening. Provided at the edge of the edge seal portion. Furthermore, a punched hole is provided at a predetermined position on both side edge portions of the bag bottom portion, and a fusion portion (in which the inner side sealant layers on both side edge portions of the two side films of the bag body portion are fused in a substantially semicircular shape ( 14).

  Next, the material which comprises the steam release packaging bag of this invention is demonstrated in detail. As shown in FIG. 9, the laminated film (1) constituting the steam release packaging bag of the present invention is a laminated film (1 (1)) in which the outer surface side is composed of a base film (18) and the inner surface side is a sealant layer (19). Can be used.

  Further, when it is necessary to improve the drop strength, the piercing strength and the gas barrier property, as shown in FIG. 10, a laminate in which an intermediate layer (20) is interposed between the base film (18) and the sealant layer (19). A film (1 (2)) can also be used.

  The outer surface-side base film (18) is not particularly limited as long as it is a packaging material for food that is generally heated in a microwave or cooked. For example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, polyimide, etc.), or a copolymer of these polymers, A relatively heat-resistant plastic film or sheet that is usually used as a packaging material can be used. The thickness is 10-50 μm. Various well-known additives and stabilizers such as an antistatic agent, an ultraviolet ray preventing agent, a plasticizer, and a lubricant can be added to the base material.

In particular, when the gas barrier property is imparted to the outer surface-side substrate film (18), which is equivalent to that of an aluminum foil, for example, the general formula R′Si ( OR) ₃ (R ′: alkyl group, vinyl group, glycidoxypropyl group, R: alkyl group, etc.) trifunctional organosilane or a hydrolyzate of the organosilane, and a composite of acrylic polyol and isocyanate compound A primer layer (23) made of a material, a thin film of an inorganic compound such as aluminum oxide or silicon oxide by a vapor deposition method such as physical vapor deposition or chemical vapor deposition, and a vapor deposition thin film layer (24) made of an inorganic oxide having a thickness of 5 to 300 nm, The gas barrier laminated film (2 shown in FIG. 11) is formed by sequentially laminating the gas barrier coating layer (25). ) It is suitably used.

The gas barrier laminate film (21) will be described in detail. As the film substrate (22) made of a transparent plastic material constituting the gas barrier laminated film, a transparent plastic film is used in order to make use of the transparency of the deposited thin film layer. Examples include polyester films such as polyethylene terephthalate and polyethylene naphthalate, polyolefin films such as polyethylene and polypropylene, polystyrene films, polyamide films, polyvinyl chloride films, polycarbonate films, polyacrylonitrile films, and polyimide films. Either stretching may be used, and those having mechanical strength and dimensional stability are preferred. The transparent plastic material is processed into a film and used. In particular, stretched polyethylene terephthalate (PET) is preferably used. Various known additives and stabilizers such as an antistatic agent, an ultraviolet ray preventing agent, a plasticizer, and a lubricant can also be added to the base material. Further, in order to improve the adhesion to the thin film, the surface of the base material can be subjected to pretreatment such as corona treatment, low temperature plasma treatment, ion bombardment treatment and the like. Alternatively, chemical treatment, solvent treatment, and the like may be performed.

  The transparent primer layer (23) is a layer made of a composite of a silane coupling agent or a hydrolyzate of the silane coupling agent, a polyol and an isocyanate compound, and the silane coupling agent is a hydroxyl group of the polyol. Or it consists of a layer containing a functional group that reacts with at least one of the isocyanate groups of the isocyanate compound.

  As a method for forming the transparent primer layer (23), as a method for preparing a primer solution for forming a composite film, a composite solution in which a silane coupling agent, a polyol, and an isocyanate compound are mixed at an arbitrary concentration is prepared. Then, it is coated on a substrate using a known printing method such as offset printing method, gravure printing method, silk screen printing method, etc., or a well-known coating method such as roll coating, knife edge coating, gravure coating, etc. The transparent primer layer can be obtained by drying and drying and removing the solvent and curing. The thickness is preferably in the range of 0.01 to 2 μm.

  In the vapor-deposited thin film layer (24) made of an inorganic oxide, the inorganic oxide is particularly preferably made of aluminum oxide, silicon oxide, magnesium oxide or a mixture thereof. Moreover, the thickness of the vapor deposition thin film layer which consists of inorganic oxides has the preferable range of thickness 5-300 nm. The optimum thickness of the thin film layer varies depending on the type and configuration of the inorganic compound used, but the value is appropriately selected. 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. On the other hand, when the film thickness exceeds 300 nm, flexibility cannot be maintained in the thin film, and the thin film may be cracked due to external factors such as bending and pulling after the film formation. A range of 10 to 150 nm is particularly preferable.

  There are various methods for forming the vapor-deposited thin film layer (24) made of the above inorganic oxide on the transparent primer layer (23), which can be formed by a normal vacuum vapor deposition method, but other thin film formation methods. A sputtering method, an ion plating method, a plasma vapor deposition method (CVD), or the like can also be used. However, in view of productivity, the vacuum deposition method is the best at present. As the heating means of the vacuum deposition apparatus by the vacuum deposition method, an electron beam heating method, a resistance heating method, or an induction heating method is preferable. In order to improve the adhesion between the thin film and the base material and the denseness of the thin film, a plasma assist method or an ion It is also possible to use a beam assist method. In addition, in order to increase the transparency of the deposited film, reactive deposition such as blowing oxygen gas may be performed during the deposition.

  The gas barrier coating layer (25) comprises a coating agent mainly composed of an aqueous solution or a water / alcohol mixed solution containing at least one of a water-soluble polymer and one or more metal alkoxides and hydrolysates or tin chloride. . Mineralize a solution in which water-soluble polymer and tin chloride are dissolved in an aqueous (water or water / alcohol mixed) solvent, or a solution in which metal alkoxide is directly or hydrolyzed beforehand. The oxide thin film layer (20b) is formed by coating and heating and drying.

Examples of the water-soluble polymer used in the coating agent include polyvinyl alcohol, polyvinyl pyrrolidone, starch, methyl cellulose, carboxymethyl cellulose, and sodium alginate. In particular, when polyvinyl alcohol (PVA) is used as a coating agent, the gas barrier property is most excellent. The PVA here is generally obtained by saponifying polyvinyl acetate, and includes from so-called partially saponified PVA in which several dozen percent of acetate groups remain to complete PVA in which only several percent of acetate groups remain. There is no particular limitation.

The tin chloride may be stannous chloride (SnCl ₂ ), stannic chloride (SnCl ₄ ), or a mixture thereof, and may be used as an anhydride or a hydrate.

Further, the metal alkoxide is represented by a general formula such as tetraethoxysilane [Si (OC ₂ H ₅ ) ₄ ] or triisopropoxyaluminum [Al (O-2′-C ₃ H ₇ ) ₃ ], M (OR) n.
(M: metal such as Si, Ti, Al and Zr, R: alkyl group such as CH ₃ and C ₂ H ₅ ). Among these, tetraethoxysilane and triisopropoxyaluminum are preferable because they are relatively stable in an aqueous solvent after hydrolysis.

  As the intermediate layer (20), for example, a biaxially stretched nylon film (ON film) or a polyester film such as biaxially stretched polyethylene terephthalate (PET) can be preferably used. Moreover, you may include the vapor deposition layer of inorganic compounds, such as a silicon oxide and an aluminum oxide.

  A printed layer (not shown) for printing a desired printed pattern composed of, for example, characters, figures, symbols, designs, etc. on the front or back surface of the base film and practically using it as a pouch. Can be formed. Specifically, the main component is an ink binder, and if necessary, a plasticizer, a stabilizer, an antioxidant, a light stabilizer, an ultraviolet absorber, a curing agent, a crosslinking agent, a lubricant, an antistatic agent, Add additives such as fillers, etc., add colorants such as pigments, and knead well with solvents, diluents, etc. to adjust the ink composition, and then add the ink composition. Using, for example, a printing method such as gravure printing can be used to form a print layer composed of a desired print pattern composed of characters, figures, symbols, patterns, and the like.

  The resin forming the sealant layer (19) is a heat-adhesive resin that is generally used as a packaging material for food that is heated or cooked in a microwave oven. The resin includes a sealant polypropylene resin and a high-density polyethylene resin. In addition to medium density polyethylene resin, linear low density polyethylene resin, low density polyethylene, ethylene-α olefin copolymer resin, ethylene-vinyl acetate copolymer resin, ionomer, etc. can be used depending on conditions. Or a mixture. A sealant layer is formed in the form of a film made of the resin. Among these, a polypropylene resin is particularly preferable because it is excellent in overall performance such as heat resistance, thermal adhesiveness, oil resistance, and low odor.

  As a laminating method for laminating the base film (18), the intermediate layer (20), and the sealant layer (19) to form a laminated film, it can be bonded by a known laminating method in the field of packaging materials. It is common to use a dry laminating method in which bonding is performed using an adhesive such as a two-component curable urethane resin.

An example of the preferable laminated film which the vapor release packaging bag of this invention comprises is shown in FIG. The laminated film having this structure is a base film (18) having a thickness of 12 μm on a biaxially stretched polyethylene terephthalate (PET) film and a primer layer (22) having a composite solution having the following composition by a gravure coating method. 0.2 μm was formed. Next, a vapor deposition thin film layer made of an inorganic oxide is obtained by evaporating metal aluminum by evaporating metal aluminum on the primer layer (22) by an electron beam heating vacuum deposition apparatus, and then depositing 20 nm thick aluminum oxide. (23) was formed. Further, a coating agent having the following composition was applied thereon with a bar coater, dried at 120 ° C. for 1 minute with a dryer, and a gas barrier coating layer having a thickness of 0.3 μm (
24) is used, a biaxially stretched nylon film having a thickness of 15 μm is used as the intermediate layer (20), and an uncoated film having a thickness of 50 to 80 μm is used as the sealant layer (19). A laminated film (26) for a steam-release packaging bag of the present invention having the following constitution using a stretched polypropylene (CPP) film is suitably used.

Gas barrier laminate film (12 μm) / 2-axis stretched nylon film (ONY) (15 μm) / unstretched polypropylene (CPP) (50-80 μm)
<Composition of composite solution>
In a diluting solvent, 2- (epoxycyclohexyl) ethyltrimethylsilane (hereinafter abbreviated as EETMS) and acrylic polyol are mixed in an amount of 5.0 times (weight ratio) with respect to EETMS and further mixed with tin chloride (SnCl ₂ ) as a catalyst. / Methanol solution (prepared to 0.003 mol / g) is added to EETMS to 1/135 mol and stirred. Then, a mixed solution in which triisyl isocyanate (hereinafter abbreviated as TDI) is added as an isocyanate compound so that NCO groups are equivalent to OH groups of acrylic polyol is diluted to an arbitrary concentration.

<Composition of coating agent>
The following (1) liquid and the following (2) liquid mixed at 60/40 in a blending ratio (wt% / wt%).
(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) Liquid: 3 wt% water / isopropyl alcohol solution of polyvinyl alcohol (90:10 by weight ratio of water: isopropyl alcohol).

  Next, as the peelable tape material (26) used in the present invention, for example, as shown in FIG. 13, an adhesive resin layer (27) exhibiting adhesion to the sealant layer on the inner surface of the packaging bag and packaging. The tape material etc. which consist of two layers with the peelable resin layer (28) which shows easy peelability by the raise of the internal pressure by the water vapor | steam which generate | occur | produces from a foodstuff etc. by microwave-heating or cooking the bag can be mentioned.

  As the adhesive resin layer (27) exhibiting adhesiveness to the sealant layer on the inner surface of the packaging bag, the adhesive heat capable of heat fusion constituting the inner surface sealant layer of the laminated film (1, 1) already described above. Although a plastic resin can be used as it is, a layer made of a propylene-based polymer (copolymer or terpopolymer) called CPP or a linear low-density polyethylene called LLDPE or LLD is preferably used. The thickness is often 20 to 150 μm.

  In addition, examples of the peelable resin layer (28) exhibiting easy peelability to the sealant layer on the inner surface of the packaging bag include, for example, block copolymer, random polypropylene copolymer, ethylene copolymer such as ethylene / vinyl acetate. A coalescence or the like is preferably used. As the ethylene-based copolymer, a copolymer having an ethylene component content of 85 to 98% by weight is particularly desirable.

  Here, a typical example of the block polypropylene-based copolymer is a polypropylene-polyethylene block copolymer, and a typical example of the random polypropylene-based copolymer is a propylene-ethylene random copolymer.

  The method for laminating the adhesive resin layer (27) and the peelable resin layer (28) is not limited, and examples thereof include dry lamination, extrusion coating, and coextrusion.

  In addition, as the easily peelable layer (1a) in the present invention, a film made of the easily peelable resin material constituting the above peelable resin layer (28) is used, for example, by a method such as dry lamination. Can be formed on the inner surface.

  Next, an example of the bag making process of the steam release packaging bag of the present invention will be described below with reference to FIGS.

  First, as shown in the perspective view of FIG. 14, the outer surface side base material of the 1st laminated | multilayer film (1) (drawing upper film) of the elongate shape (winding shape) wound out from a winding frame (not shown). On the other hand, a long (winding-like) second laminated film (1) (lower film in the drawing) unwound from another winding frame (not shown) with the sealant layer on the upper side and the film on the upper side A long strip (winding shape) made of the same laminated film as the first and second laminated films (1, 1), with the outer surface side base material film on the lower side and the sealant layer on the upper side. The laminate film (4a, 4a) is further unwound from another winding frame (not shown), and a sealant layer surface is placed on the outside with a folding machine (not shown) so as to form a V-shaped cross section. Make sure the bag bottom is folded so that the layer is on the inside. While the laminated film (4, 4) is unwound in the horizontal direction at the same feeding speed between the first and second laminated films (1, 1), it is folded into the first laminated film (1). The fin-shaped folds (3, 3) are formed by folding them back in opposite directions in a V shape with a guide plate (not shown).

Subsequently, the long and tape-like easily peelable tape material (2) from another winding frame is brought into partial contact with the fin-like folds (3, 3) formed on the first laminated film (1). And the peelable resin layer (28) surface (see FIG. 13) of the easily peelable tape material (2) is bonded to the fin-like folded portions (3, 3) side of the easily peelable tape material (2, 2). The surface of the conductive resin layer (27) (see FIG. 13) is unwound so as to be positioned on the second laminated film (1) side, and is inserted between the first and second laminated films (1, 1) at the same feeding speed. To do.

  FIG. 15 schematically shows a cross-sectional view of the perspective view of FIG. 14 described above.

Then, as shown in the plan view of FIG. 17, the first and second laminated films (1, 1), the laminated film (4, 4) forming the bag bottom, and the easily peelable tape material (2, 2) are temporarily run. Is stopped (or while unwinding), and the side sealer (heat seal bar with pattern seal continuous to the side seal width, not shown) arranged in the direction perpendicular to the unwinding direction is lowered. (Or move it down while moving at the same speed as the film feed speed), and both ends of the bag body are heat-sealed at equal intervals in the orthogonal direction to form the edge heat-seal (9, 9) such a non-sealing portion (7,7) the vapor vent port easy peeling tape having a having a venting opening continuous with the edge portion heat sealed portion Fukurodo portion one end edge at the same time is Pattern at position Heat sealed pattern heat-sealed portion (6,6) is formed. Further, the surface of the adhesive resin layer (27) is the inner surface of the second laminated film (1) so that the easily peelable tape material (2, 2) partially contacts the fin-shaped folded portions (3, 3). The surface of the sealant layer is heat-sealed with a patterned heat seal portion (6, 6) in a state where it cannot be peeled off by vapor pressure, while the peelable resin layer (28) surface of the easily peelable tape material (2) is The first laminated film (3, 3) is heat-sealed in a pattern shape provided with non-sealing portions (7, 7) so as to partially contact the fin upper folding portion (3, 3) at the pattern-shaped heat sealing portion (6, 6). The sealant layer surface of the inner surface of 1) is heat sealed in a state where it can be easily peeled off by vapor pressure.

  Subsequently, through holes (8, 8) serving as steam vents are formed in the non-sealed portions (7, 7) provided in the pattern heat seal portion by a punching blade (not shown).

Subsequently, the first and second laminated films (1, 1), the laminated film (4, 4) forming the bag bottom, and the easily peelable tape material (2, 2) are stopped temporarily (or unwound). The first heat seal bar (not shown) provided with the bag bottom heat seal portion in the film running direction is lowered (or moved downward while being moved at the same speed as the film feed speed), and the first The inner sealant layer of the laminated film (1), the sealant layer of the strip-like bag bottom laminated film (4, 4) folded back in a V-shape, and the inner sealant layer of the second laminated film (1) and V The sealant layers of the strip-like bag bottom laminated films (4, 4) folded back in a letter shape are heat-sealed. Thereby, a bag bottom seal portion (10, 10) as shown in FIG. 1 is formed.

  Usually, in the bag making process described above, as shown in FIG. 5, an easy-cut means such as a notch (13) for cutting the packaging bag to form an opening is used as a trunk side edge seal portion in the vicinity of the opening. Provided at the edge of Furthermore, a punched hole is provided at a predetermined position on both side edge portions of the bag bottom portion, and a fusion portion (in which the inner side sealant layers on both side edge portions of the two side films of the bag body portion are fused in a substantially semicircular shape ( 14).

  As a method of providing the fusion part (14) fused in the semicircular shape, as shown in the enlarged view of FIG. 16, the strip-like bag bottom laminated film (4, 4) folded back in a V-shape. The punched holes coincide with each other on both sides of the punched hole at equal intervals so that the length between the centers of the punched holes is equal to the width of the bag to be obtained, and the first laminated film (1) And the second laminated film (1) are arranged so that the inner surface of the sealant layer faces each other, both ends of the bag body are heat-sealed through the punch holes, and the first laminated film (1) And the sealant layer on the inner surface of each of the second laminated films (1) are fused and punched together with the strip-like bag bottom laminated film (4, 4) folded back in a V shape, punch holes Along the cutting line perpendicular to the film unwinding and feeding direction at the center of the film Is cut into equal equal intervals in the width of the bag to be, it can be provided substantially fused portion that is fused to the semicircular shape (14).

  In this way, the outer surface side is composed of the base film and the inner surface side is composed of the laminated film (1, 1), the bag bottom laminated film (4, 4), and the easily peelable tape material (2, 2). The two side edges of the side film on the two sides of the bag body are heat-sealed, and the steam as steam removing means is continuous with the body side edge seal part and the body side edge seal part. A gusset-folded folding part in which a patterned heat seal part provided with a non-seal part having a vent is provided at a predetermined position on at least one side edge part of the bag body part, and the bag bottom part folds the film inward in a V shape. Is a standing pouch-type steam release packaging bag for heating a microwave oven along the cutting line L2 perpendicular to the film running direction. It is cut at equal intervals equal to the width of the bag to be obtained by a cutting device (not shown), and further, the bags are separated from each other by a cutting device (not shown) along the film running direction center line L1, The steam release packaging bag of the present invention is filled before the contents shown in FIG. 1 in which the opening 5 corresponding to the upper seal portion of the steam release packaging bag of the present invention is opened in an unsealed state.

  As a bag-making method of the above-described steam release packaging bag of the present invention, the outer surface is composed of two laminated films comprising a base film and the inner surface is a sealant layer, a bag bottom laminated film, and an easily peelable tape material (2, 2). Although the configuration is exemplified, the present invention is not limited to this, and the inner fold portion and the outer side of the gusset fold formed by sequentially folding back into a V shape using a single laminated film having a base film on the outer surface side and a sealant layer on the inner surface side Apply a folding part to form a fin-like folding part on the front surface of the bag body, and then fold it back into a W shape to form an inner folding part and an outer folding part to form a bag bottom, and place the easy-release tape material at a predetermined position. A heat-sealed pattern-shaped heat seal portion and a bottom seal portion are provided that are heat-sealed and have a non-seal portion having a steam vent continuously connected to both side edge seal portions of the body portion. Form the present invention It is also possible to manufacture the venting packaging bag.

  In addition, as shown in FIG. 1, the state before filling the contents of the steam-extracted packaging bag of the present invention is opened in an unsealed state with the upper end (upper side of the drawing) of the packaging bag as an opening. As shown in FIG. 6, after filling the packaging bag 15 with the contents 15 such as liquid and solid, the opening 5 is heat-sealed to form an upper end seal portion 16, and the package is filled and sealed.

  As shown in FIG. 7, the steam release packaging bag of the present invention shown in FIG. 1 is filled with liquid or solid cooked or semi-cooked food from the opening at the upper end into the packaging bag. When a hermetically packaged packaged food package (see FIG. 5A) is heated in a cooking machine such as a microwave oven, the inside of the bag is predetermined by a gas (17) such as water vapor generated from the contents of the food. When the internal pressure is reached, the easily peelable layer surface of the easily peelable tape material (2) peels from the bag body laminated film (1) at the patterned heat seal part (see FIG. 5 (b)), and a fin-like fold is formed. The portion (3) expands due to an increase in internal pressure, and the bag internal pressure is concentrated at the arrow position (6a) where the fin upper end (3a) and the pattern-like heat seal portion (6) cross each other, so that the heat seal portion (6) The seal retreats to the non-sealed part (7) securely and efficiently. In addition, a gas such as water vapor inside the bag can be stably released from the through hole (8) that is in communication and is provided in the non-sealed portion (7) as a steam outlet (see FIG. 3C). .

  Also, as shown in FIG. 8, the steam-extracted packaging bag of the present invention shown in FIG. 4 is filled with a cooked or semi-cooked food such as liquid or solid from the upper end through the opening into the packaging bag. When the packaged food package (see Fig. 1A) is heated in a cooking machine such as a microwave oven, the inside of the bag is predetermined by a gas such as water vapor (17) generated from the contents of the food. When the internal pressure is reached, the easily peelable layer surface of the easily peelable tape material (2) peels from the bag body laminated film (1) at the patterned heat seal part, and the fin-like folded part (3) rises in internal pressure. (See FIG. 5B), and the bag-like pressure concentrates at the arrow position (11a) where the fin upper end (3a) and the pattern heat seal part (11) intersect, and the pattern heat seal part. The seal retreat of (11) occurs and the non-seal part (12 Until then, the non-seal part (12) itself that communicates and extends to the end of the body part serves as a steam vent and can stably release a gas such as water vapor inside the bag ((c) in the figure). reference).

  The steam-extracted packaging bag of the present invention obtained above reliably and easily allows gas such as water vapor inside the bag generated from contents such as food to be heated or cooked in a cooking machine such as a microwave oven. Since it can be stably released, it is possible to provide a standing pouch-type steam release packaging bag for heating a microwave oven in which the surroundings of the bag and the inside of the microwave oven are not soiled. Moreover, since the direction of the top | upper surface used as the opening part which takes out the contents differs from the direction of a steam vent, the steam-extracting packaging bag of this invention does not touch a vapor | steam at the time of content extraction, and is safe. In addition, since the steam release packaging bag of the present invention can reliably and easily release steam, it is not necessary to cut out a part of the bag with scissors or the like, and there is no need for trouble and trouble of steam release. . Furthermore, since the steam release packaging bag of the present invention has a configuration that can change the seal width or can have an irregular seal (pattern seal), it is not hot even if it is held with bare hands, and can be a safe packaging bag. Is.

It is the top view (a) which shows an example of the steam-release packaging bag of this invention, and a schematic cross section (b) of the XX 'direction in the top view. It is the top view (a) which shows the other example of the steam-release packaging bag of this invention, and the schematic cross section (b) of the XX 'direction in the top view. It is the top view (a) which shows another example of the steam release packaging bag of this invention, and the schematic cross section (b) of the XX 'direction in the top view. It is the top view (a) which shows another example of the steam-release packaging bag of this invention, and the schematic cross section (b) of the XX 'direction in the top view. A notch for forming an opening by cutting into a bag and punch holes at predetermined positions on both side edge portions of the bag bottom portion are provided so that the inner side sealant layers on both side edge portions of the two side films of the bag body portion are almost It is a top view which shows an example of the steam release packaging bag of this invention which provided the melt | fusion part melt | fused by semicircle shape. The top view (a) of the steam release packaging bag of the present invention, which is filled with contents such as cooked or semi-cooked food and hermetically packaged at room temperature, and a schematic sectional view in the XX 'direction in the plan view ( b). In an example of the steam-release packaging bag of the present invention, which is filled and sealed with contents such as cooked or semi-cooked food, such as steam inside the package generated by heating in a cooking machine such as a microwave oven They are a plan view (a) as an explanatory diagram for letting gas escape, a schematic cross-sectional view (b) in the XX ′ direction in the plan view, and a schematic cross-sectional view (b) in the YY ′ direction in the plan view. In another example of the steam release packaging bag of the present invention, which is sealed and packaged with contents such as cooked or semi-cooked food, water vapor generated inside the package body upon heating in a cooking machine such as a microwave oven FIG. 2A is a plan view (a) as an explanatory diagram for releasing a gas such as FIG. 1, a schematic cross-sectional view (b) in the XX ′ direction in the plan view, and a schematic cross-sectional view (b) in the YY ′ direction in the plan view. . It is a schematic cross section which shows an example of the laminated | multilayer film which comprises the bag in the steam release packaging bag of this invention. It is a schematic cross section which shows the other example of the laminated | multilayer film which comprises the bag in the steam release packaging bag of this invention. It is a schematic cross section which shows an example of the gas barrier laminated film which comprises the laminated | multilayer film which comprises the bag in the steam release packaging bag of this invention. It is a schematic cross section which shows another example of the laminated | multilayer film which comprises the bag in the steam release packaging bag of this invention. It is a schematic cross section which shows an example of the easily peelable tape material used for the steam release packaging bag of this invention. It is a model perspective view explaining an example of the manufacturing method of the steam release packaging bag of this invention. It is a schematic cross section explaining an example of the manufacturing method of the steam release packaging bag of the present invention. It is a model perspective view explaining an example of the manufacturing method of the steam release packaging bag of this invention. It is a schematic plan view explaining an example of the manufacturing method of the steam release packaging bag of this invention. It is a model perspective view explaining an example of the conventional steam release packaging bag. It is a model perspective view explaining an example of the conventional steam release packaging bag. It is a model perspective view explaining an example of the conventional steam release packaging bag.

Explanation of symbols

1, 1 (1), 1 (2), 1 (3) ... Laminated film 1a constituting the bag body part ... Easy peelable layer 1 (1) ...
2, 26 ... easy peelable tape material 3 ... fin-like folding part 3a ... fin upper end part 4 ... bag bottom part 5 ... opening (unsealed part)
6, 11 ... pattern seal part 6a, 11a ... fin upper end part and pattern seal part intersecting part 7, 12 ... non-seal part 13 ... notch 14 ... punch hole 15 ... contents Product 16 ... Bag upper end seal part 17 ... Steam 18 ... Base film 19 ... Sealant layer 20 ... Intermediate layer 21 ... Gas barrier vapor deposition laminated film 22 ... Plastic base film 23 ... Primer layer 24 ... Deposited thin film layer 25 made of inorganic compound ... Gas barrier coating layer 27 ... Adhesive resin layer 28 ... Easily peelable resin layer 29 ... Laminated film 30 ... First joint (relief part)
31 ... 2nd junction part 33 ... Contents 34 ... Packaging for heat treatment A, B, C, D, E, F, G, H ... Vapor release packaging bag O ... Bag Center line L1, L2 ... cutting line

Claims (6)

At least, the outer surface side is bag-formed using a laminated film consisting of a base film and an inner surface side consisting of a sealant layer,
Both side edges of the side film on the two sides of the bag body are heat-sealed to form body side edges seals,
The bottom of the bag is a gusset-folded fold formed by folding the film inwardly in a V shape,
A standing pouch-type steam release packaging bag for heating a microwave oven in which a bottom seal portion capable of standing on the bottom side is formed,
The inner fold portion and the outer fold portion of the gusset fold formed by folding the film inwardly in a V shape at a predetermined position on the front surface of one of the two side films of the body portion are substantially parallel to the opening portion of the bag body. Forming a fin-like fold in the bag width direction,
A patterned heat seal part provided with a non-seal part having a steam vent as a steam vent means is provided continuously at least at a predetermined position of the bag body part one side edge part to the body side edge seal part,
A non-sealing portion of the pattern heat seal portion is provided in the vicinity of the upper end of the fin portion of the fin-shaped folding portion, and the pattern heat seal portion is provided.
Further, an easily peelable tape material or an easily peelable layer having a predetermined width in the width direction of the bag is formed on the inner surface of the two side films forming the bag body so as to contact the fin-like folded portion and the steam vent. It consists of a configuration provided with intervening,
When the food bag is sealed and packaged, and the inside of the bag reaches a predetermined internal pressure during heating or cooking with a microwave oven, the fin-shaped folded portion expands due to an increase in internal pressure, and the fin upper end and the pattern-shaped heat seal portion The pressure inside the bag is concentrated at the position where the crossing and the non-sealed portion of the pattern-shaped heat seal portion, the seal retreat surely occurs, and has a steam venting function capable of stably releasing the steam inside the bag. A steam-decomposable packaging bag.   The steam vent as the steam vent means is a steam vent comprising a through hole or a slit-like hole in the non-sealed portion of the patterned heat seal portion having a non-sealed portion. Steam-free packaging bag.   The steam vent as the steam vent means is a steam vent in which the non-sealed portion of the patterned heat seal portion having a non-sealed portion extends to the edge on the side of the body portion. Steam vent packaging bag. The easy-peeling tape material is composed of an adhesive resin layer and an easy-adhesive resin layer, and the easy-peeling tape material is opposite to the side film provided with the fin-like folds in the two side films of the bag body. The steam-extracting packaging bag according to any one of claims 1 to 3, wherein the packaging film is attached to an inner surface of the side film through the adhesive resin layer.   The easy-peeling tape material is composed of an adhesive resin layer and an easy-adhesive resin layer, and the easy-peeling tape material is the fin of the side film provided with the fin-like folds in the two side films of the bag body. Any one of claims 1 to 3, wherein the adhesive resin layer is attached to the inner surface of a side film that is partially sandwiched between the fold-like folds and provided with fin-like folds. The steam release packaging bag according to item. The said easily peelable layer is formed in the inner surface of the side film opposite to the side film which provided the said fin-shaped folding part among the two side films of a bag trunk | drum. 4. The steam release packaging bag according to any one of 3 above.