JP4770496B2 - Packaging bag with steam venting function - Google Patents

Description

  The present invention relates to a packaging bag for storing cooked or semi-cooked food, etc., and a packaging bag having a function of automatically removing steam generated by internal pressure when heating it with a microwave oven, In particular, the present invention relates to a packaging bag having a steam release function that can reliably detect defective products during the production of the packaging bag.

  In recent years, with the development of food processing technology and packaging technology for storing it, the spread of microwave ovens, and the like, many types of packaging bags for microwave ovens have been marketed and used.

  The microwave oven vibrates water molecules contained in foods by high-frequency irradiation, and heats foods with frictional heat generated by the vibrations. Plastic film is generated by water vapor generated by the heating. In a normal sealed packaging bag formed of, it expands and ruptures and soils the inside of the microwave oven.

  In order to prevent such rupture, conventionally, before heating in a microwave oven, an increase in the internal pressure of the packaging bag has been suppressed by opening a small hole in a portion of the packaging bag with scissors or the like in advance or cutting it out.

  However, in the method of opening and cutting holes as described above, in addition to this labor and inconvenience, steam generated after heating is immediately released out of the packaging bag. ) There is a problem that the effect is reduced and the drying of the food inside proceeds, which contributes to the deterioration of the food.

  As a solution to the above problems, for example, as shown in the perspective view of FIG. 13, the laminated film (100) is formed into a cylindrical shape, and the same surface side of both end portions (101) facing the film is formed. As shown in the perspective view of FIG. 14, the superposed surfaces are joined to each other by heat sealing to form an easily peelable region in the partial region over the entire length in the longitudinal direction, After providing a heat seal part (102) of a predetermined width to form a cylinder, and biasing the heat seal part (102) toward one end of the cylinder, excluding the lower side of the heat seal part (102), After the bottom side of the cylinder is heat sealed and a bottom heat seal part (103) is provided to form a bag, the contents are filled from the opening on the top side of the cylinder, and then, for example, in the perspective view of FIG. As shown, remove the top side of the heat seal (102). Te sealing the upper portion of the cylindrical body, there is a sealed package and packaging bag upper heat-sealed portion (104) provided (106) (e.g., see Patent Document 1.).

  In the packaging bag (106) shown in FIG. 12 above, when the steam pressure inside the bag rises due to heating, the easy peeling region provided in a partial region of the heat seal part (102) peels off and the steam is released. The escape pressure of the vapor pressure can be performed.

  However, even if the packaging bag (106) as described above is adopted, the contents after the heating are observed in the easy peeling region provided in a partial region of the heat seal portion (102) of the packaging bag (106). Therefore, it is difficult to say that the contents can be prevented from being scattered in a complete state and contamination inside the microwave oven can be avoided.

In order to solve the above problems, the present applicant has recently proposed, for example, at least the contents on the inner surface as shown in FIGS. 16 (a) and 16 (b) and the enlarged sectional view of FIG. Back side laminated film (1) and front side laminated film (2) having a white hiding layer (24) for concealing objects and floating letters and patterns and a sealant layer (23) for heat sealing on the innermost surface The front-side laminated film (2) is provided with a V-shaped inner folded portion (2b) and an outer folded portion (2a), and the sealant layer ( 23), the inner folded portion (2b) and the outer folded portion (2a) are folded and overlapped, and the folded overlap portion has an unsealed portion (4a). You A pattern that is sealed in a pattern consisting of three regions: a left seal portion (4), a central seal portion (3) having an unsealed portion (3a), and a right seal portion (5) having an unsealed portion (5a). A peelable tape material which is provided with a seal portion and which is easily peelable on the inner surface of the folded overlap portion by an internal pressure of a gas such as water vapor generated by heating the packaging bag with respect to the sealant layer (23). (6) is interposed by being sealed with a pattern seal composed of the left and right and center seal portions (4, 5, 3) and a side seal portion (8, 8), and at least the center seal portion (3) is not There is a packaging bag having a steam venting function in which a steam vent hole (7) penetrating over the peelable tape material (6) is formed in the seal portion (3a) (for example, see Patent Document 2).

The above prior art documents are shown below.
JP-A-9-150864 Japanese Patent Application No. 2004-353717

  However, in the conventional packaging bag technology having a steam venting function, for example, as shown in FIG. 17, the peelable tape material (6) intervening in the folded overlap portion is formed by the front side laminated film (2). Because of the white hiding layer (24) provided in the bag, for example, even if the bag is twisted during the manufacture of the bag or is displaced with respect to the folded overlap portion, the state is visually recognized at least during the manufacture. Since this is not possible, there has been a problem that a defective product cannot be detected.

  The present invention solves such problems of the prior art, and the problem is that the front and back sides have a white hiding layer for hiding contents at least on the inner surface of the base film and a sealant layer on the innermost surface. The laminated film is overlapped, and the front side laminated film is provided with a pattern seal portion having at least one unsealed portion in the V-shaped folded overlapped portion or the corresponding overlapped portion, on the inner surface of the overlapped portion Is a steam in which a peelable tape material exhibiting easy peelability is sealed and interposed by the pattern seal portion, and at least the unsealed portion has a steam vent hole penetrating over the peelable tape material. In a packaging bag having a punching function, at least during the production, the state of the peelable tape material, that is, the twisted or displaced state can be visually confirmed. And to provide a packaging bag having a venting function to ensure the detection of goods.

In order to achieve the above object in the present invention, first, in the invention of claim 1, at least a back side laminated film and a front side laminated film having a white hiding layer on the inner surface of the base film and a sealant layer on the innermost surface. Overlap, the front side laminated film is a packaging bag comprising a V-shaped inner folded portion and an outer folded portion, and the periphery of the end portion of the superimposed film is sealed by heat sealing with the sealant layer, The inner folded portion and the outer folded portion are folded and overlapped, and the folded overlap portion is provided with a pattern seal portion having at least one unsealed portion, and further, the sealant is provided on the inner surface of the folded overlap portion. A releasable tape material that exhibits easy releasability with an internal pressure of a gas such as water vapor generated by heating the packaging bag with respect to the layer is the pattern sheet. Sealed interposed in parts, said the unsealed portion in the packaging bag having a venting function venting holes penetrating over the peeling tape material is bored,
The white concealment layer of the front side laminated film of the inner folded portion surface constituting the folded overlap portion forms a white portion that is removed by a predetermined width in parallel with the peelable tape material interposed on the inner surface. This is a packaging bag having a steam release function.

In the invention of claim 2, at least one laminated film having a white hiding layer on the inner surface of the base film and a sealant layer on the innermost surface is folded in the lateral direction to form a back-side laminated film and a front-side laminated film. The back side laminated film and the front side laminated film are overlapped, and the front side laminated film is provided with a V-shaped inner folded portion and an outer folded portion, and the periphery of the end portion of the laminated film is heated by the sealant layer. A packaging bag for sealing with a seal, wherein the inner folded portion and the outer folded portion are folded and overlapped, and the folded overlap portion is provided with a pattern seal portion having at least one unsealed portion, and On the inner surface of the folded overlap portion, an internal pressure by a gas such as water vapor generated by heating the packaging bag is applied to the sealant layer. A peelable tape material exhibiting peelability is sealed and interposed by the pattern seal portion, and the unsealed portion has a vapor venting function in which a vapor vent hole penetrating the peelable tape material is formed. In the packaging bag,
The white concealment layer of the front side laminated film of the inner folded portion surface constituting the folded overlap portion forms a white portion that is removed by a predetermined width in parallel with the peelable tape material interposed on the inner surface. This is a packaging bag having a steam release function.

Moreover, in invention of Claim 3, it consists of a front side laminated film, a back side laminated film, and a bottom side laminated film which have a white hiding layer at least on the inner surface of the base film and a sealant layer on the innermost surface, The back side laminated film is laminated with the sealant layer on the inside, and the bottom side of the front side laminated film is folded in the lateral direction so that the sealant layer is exposed on the outside to form a folded portion and laminated on the back side laminated film, The folded portion of the front side laminated film and the portion where the sealant layer is exposed without overlapping the front side laminated film of the back side laminated film are overlaid with the bottom side laminated film, and the periphery of the end portion of the laminated film is the sealant layer. A heat-sealed packaging bag, the folded portion of the front laminated film and the bottom laminated film The overlapped portion is provided with a pattern seal portion having at least one unsealed portion, and the inner surface thereof is subjected to an internal pressure by a gas such as water vapor generated by heating the packaging bag against the sealant layer. A peelable tape material having an easy peelability is sealed with the pattern seal portion, and a steam venting hole is formed in the unsealed portion. In the packaging bag you have,
Vapor venting function, wherein the white concealing layer on the folded portion surface of the front side laminated film forms a whitened portion removed by a predetermined width in parallel with the peelable tape material present on the inner surface A packaging bag having

Further, in the invention of claim 4, at least the back side laminated film and the front side laminated film having a white hiding layer on the inner surface of the base film and the sealant layer on the innermost surface are superposed, and the periphery of the end portion of the superposed film is covered. It is a packaging bag that is sealed by heat sealing with the sealant layer, and a pattern sealing portion having at least one unsealed portion is provided in the overlapping portion on the low side to be heat sealed, and further on the inner surface thereof Further, a peelable tape material that is easily peelable by an internal pressure caused by a gas such as water vapor generated by heating the packaging bag is interposed between the sealant layer and the unsealed portion, sealed by the pattern seal portion. Has a vapor vent hole penetrating over the peelable tape material, and the bottom side is folded back to the front laminated film side to form a folded portion. In and section bottom side packaging bag both side edges of the opposite end edges and said front and back laminated film of the seal portion has a vapor venting function that are partially bonded in,
Vapor removal characterized in that the white masking layer of the front side laminated film constituting the folded portion forms a whitened portion removed by a predetermined width in parallel with the peelable tape material interposed on the inner surface. This is a packaging bag having a function.

In the invention of claim 5, the back side laminated film and the front side laminated film having a white hiding layer at least on the inner surface of the base film and having the sealant layer on the innermost surface are superposed, and on the bottom side of the back side laminated film, , A packaging bag comprising a Z-shaped folded portion and sealing the periphery of the end portion of the overlap film with the sealant layer by heat sealing, wherein at least one overlap portion on the bottom side to be heat sealed A peelable tape material which is provided with a pattern seal portion having two unsealed portions, and which is easily peelable on the inner surface by an internal pressure of a gas such as water vapor generated by heating the packaging bag against the sealant layer However, a steam venting function in which a steam vent hole penetrating over the peelable tape material is formed in the unsealed portion is sealed and interposed by the pattern seal portion. In the packaging bag having,
A vapor condensing function characterized in that the white concealing layer on the bottom side of the back side laminated film forms a whitened portion removed by a predetermined width in parallel with the peelable tape material present on the inner surface. It is a packaging bag having.

  According to a sixth aspect of the present invention, the white portion formed in the white concealing layer has a width that does not protrude from the inner top end of the pattern seal portion inside the unsealed portion. A packaging bag having a steam venting function according to any one of claims 1 to 5.

  Moreover, in invention of Claim 7, the said steam vent hole is either a small hole, a notch, or a slit, It is set as the packaging bag which has a steam vent function in any one of Claim 1 thru | or 6 characterized by the above-mentioned. Is.

  Since this invention is the above structure, there exist the following effects.

  That is, according to the first and second aspects of the invention, the peelable tape material in which the white hiding layer provided on the inner folded portion surface constituting the folded overlap portion of the front side laminated film is interposed on the inner surface, By forming the white portions that are removed in parallel with a predetermined width, the state of the peelable tape material intervening on the inner surface (for example, whether it is twisted or misaligned) is visible during manufacturing. Thus, when such an abnormality occurs, a measure such as stopping the line as soon as possible is taken, and a packaging bag having a steam venting function that can prevent the introduction of defective products is obtained.

  Furthermore, according to the inventions according to the first and second aspects, when the white portion is provided on the inner folded portion surface constituting the folded overlap portion, the white portion when the product becomes a product. Since it becomes invisible, it can be set as the packaging bag which has a vapor venting function without the problem that it does not look good on a design.

  Moreover, according to the invention which concerns on the said Claim 3, the white concealment layer of the folding | turning part surface of a surface side laminated | multilayer film has the white part remove | excluded by the predetermined width in parallel with the peelable tape material currently interposed in the inner surface. By forming it, it is possible to visually check the state of interposition of the peelable tape material intervening on the inner surface during manufacturing (for example, whether there is any twisting or displacement), and when such an abnormality occurs It is a packaging bag having a steam venting function that can take measures such as stopping the line as soon as possible and prevent the introduction of defective products.

Furthermore, according to the third aspect of the present invention, when the white portion is provided on the folded portion surface of the front laminated film, the white portion is not visible when the product is a product. Therefore, it can be set as the packaging bag which has a vapor venting function without the problem that it does not look good on a design.

  Further, according to the invention according to claim 4, the white concealment layer of the front side laminated film constituting the folded portion is a white portion removed by a predetermined width in parallel with the peelable tape material interposed on the inner surface. In this way, it is possible to visually confirm the intervening state of the peelable tape material intervening on the inner surface (for example, whether there is any twisting or displacement) during manufacturing, and such an abnormality has occurred. At times, measures such as stopping the line are taken, and a packaging bag having a steam venting function that can prevent the introduction of defective products is obtained.

  Furthermore, according to the invention according to claim 4, when the white portion is provided on the front laminated film surface constituting the folded portion, the white portion is visible when the product becomes a product. Therefore, it is possible to obtain a packaging bag having a steam venting function that does not have a problem of not being attractive in design.

  Further, according to the invention according to claim 5, the white hiding layer on the bottom side of the back side laminated film forms a white portion removed by a predetermined width in parallel with the peelable tape material interposed on the inner surface. By doing so, it is possible to visually recognize the state of interposition of the peelable tape material intervening on the inner surface during manufacturing (for example, whether there is any twisting or displacement), and promptly when such an abnormality occurs. By taking measures such as stopping the line, it is possible to obtain a packaging bag having a vapor venting function that prevents the introduction of defective products.

  Furthermore, according to the invention according to claim 5, when the white portion is provided on the back side laminated film surface on the bottom side, a Z-shaped folded portion of the back side laminated film becomes a product. Therefore, it is possible to obtain a packaging bag having a steam venting function which does not have a problem of not being attractive in design.

  According to the invention of claim 6, the white portion formed in the white hiding layer has a width that does not protrude from the inside of the pattern seal portion inside the unsealed portion, thereby interposing the inside. The state of the peelable tape material to be twisted or displaced can be visually recognized, and if the lower end of the width comes out from the pattern seal portion, the contents (curry or the like) will be seen, which is not preferable.

  Furthermore, according to the invention according to the seventh aspect, since the steam vent is any one of a small hole, a notch, or a slit, an optimal shape (size, etc.) is appropriately included depending on the contents to be stored. ) Can be selected.

  Therefore, the present invention is an excellent packaging bag for storing cooked or semi-cooked foods, etc., and having a function of automatically removing steam generated by internal pressure when it is heated in a microwave oven. It has a practical effect.

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

  For example, as shown in the schematic cross-sectional view of FIG. 1, the present invention stores cooked curry and other contents (40), and heat-seal the front side laminated film (2) and the back side laminated film (1). When the packaging bag is sealed by forming a seal portion (9) and a top seal portion (15), the water vapor (42) generated by the internal pressure (43) is heated from the vapor vent hole (7) when heated in a microwave oven. The present invention relates to a packaging bag having a steam venting function so as to be automatically removed.

The invention according to claim 1 includes, for example, a plan view of FIG. 2A and a cross-sectional view of FIG. 2B showing its BB plane, and FIG. 3 as an enlarged view of FIG. 2B. As shown in the schematic cross-sectional view, a back side laminated film (1) having a white hiding layer (24) on the inner surface of the base film (20) and a sealant layer (23) on the innermost surface ( 2) and the front laminated film (2) is provided with a V-shaped inner folded portion (2b) and an outer folded portion (2a), and a sealant layer ( 23) is a packaging bag which is heat-sealed and sealed with the side seal portions (8, 8) and the bottom seal portion (9), and the inner folded portion (2b) and the outer folded portion (2a) are folded and overlapped. Has been.

The folded and overlapped portion includes a left seal portion (4) having an unsealed portion (4a), a central seal portion (3) having an unsealed portion (3a), and a right seal having an unsealed portion (5a). A pattern seal portion is provided that is sealed in a pattern consisting of three regions of the portion (5), and the inner surface of the folded overlap portion heats the packaging bag against the sealant layer (23). The pattern seal portion is composed of the left seal portion (4), the central seal portion (3), and the right seal portion (5). In a packaging bag having a steam venting function, in which a steam vent hole (7) penetrating over the peelable tape material (6) is formed in the central unsealed portion (3a),
In particular, as shown in FIG. 3, a peelable tape material in which a white hiding layer (24) of the front side laminated film (2) on the inner folded portion (2 b) surface constituting the folded overlap portion is interposed on the inner surface ( 6) A packaging bag having a steam venting function, wherein a whitened portion (25) removed in parallel with a predetermined width is formed.

  According to the said invention, as shown in FIG. 3, the white hiding layer (24) provided in the inner side folding | returning part (2b) surface which comprises the folding | wrapping overlapping part of a front side laminated | multilayer film (2) intervened in the inner surface. By forming the hollow portion (25) removed in a predetermined width in parallel with the peelable tape material (6), the peelable tape material ( 6) The intervening state (for example, whether there is any twisting or deviation) can be visually recognized, and mixing of defective products can be prevented in advance.

  Furthermore, as shown in FIG. 3, since the white portion (25) is provided on the inner folded portion (2b) constituting the folded overlap portion, the white portion (25) when the product is manufactured. ) Cannot be seen, and is a packaging bag having a steam venting function that does not have a problem such as not looking from the design.

  Further, in the invention according to the second aspect, although not particularly shown, a single laminated film having a white hiding layer on the inner surface of the base film and a sealant layer on the innermost surface is arranged in a lateral direction via a fold line. A back side laminated film and a front side laminated film are formed by bending, and thereafter, for example, a packaging bag having a steam venting function substantially similar to that shown in FIGS. 2 (a), 2 (b) and 3 is used. Is.

Further, the invention according to claim 3 is applied to a packaging bag having a vapor venting function of another form with respect to the inventions according to claims 1 and 2, for example, a plan view of FIG. As shown in FIG. 4 (b) showing the cross section, and the cross-sectional schematic diagram of FIG. 5 which is an enlarged view thereof, the inner surface of the base film (20) has a white hiding layer (24), and the innermost surface thereof. Consists of three laminated films, a front laminated film (2) having a sealant layer (23), a back laminated film (1), and a bottom laminated film (33), and the front laminated film (2) and the back laminated film. The film (1) is overlapped with the sealant layer (23) on the inside, and folded back in the lateral direction so that the bottom side sealant layer (23) of the front laminated film (2) is exposed to the outside. ) Forming and laminating it backside The sealant layer (23) is exposed without overlapping the folded portion (11) of the front side laminated film (2) and the front side laminated film (2) of the back side laminated film (1). The portion is overlapped with the bottom laminated film (33).

A packaging bag that seals the periphery of the end portion of the laminated film by heat sealing with the sealant layer to form a bottom seal portion (9), side seal portions (8, 8), and top seal portion (17). There is a left seal portion (4) having an unsealed portion (4a) at an overlap portion between the folded portion (11) of the front side laminated film (2) and the bottom side laminated film (33), and an unsealed portion There is provided a pattern seal portion that is sealed in a pattern consisting of three regions of a central seal portion (3) having a portion (3a) and a right seal portion (5) having an unsealed portion (5a). On the inner surface of the folded and overlapped portion, a peelable tape material (6) showing easy peelability by the internal pressure of a gas such as water vapor generated by heating the packaging bag with respect to the sealant layer (23) is provided on the left side. Seal (4) and inside Sealed by a pattern seal portion consisting of a seal portion (3) and a right seal portion (5) and interposed, and the unsealed portions (4a, 3a, 5a) at the three locations span a peelable tape material (6). In a packaging bag having a steam venting function in which a steam venting hole (7) penetrating therethrough is formed,
In particular, as shown in FIG. 5, the white hiding layer (24) of the folded portion (11) surface of the front side laminated film (2) has a predetermined width parallel to the peelable tape material (6) intervening on the inner surface. It can also be set as the packaging bag which has the steam removal function characterized by forming the removed white part (25).

  Further, the invention according to claim 4 is applied to a packaging bag having a vapor venting function of another form with respect to the inventions according to claims 1, 2, and 3, for example, a perspective view of FIG. As shown in the figure and FIG. 6 (b) showing the cross section thereof, and in the schematic cross-sectional view of FIG. 7 which is an enlarged view thereof, the substrate film (20) has a white hiding layer (24) on the inner surface, The back side laminated film (1) having the sealant layer (23) on the innermost surface is superposed on the front side laminated film (2), and the periphery of the end portion of the laminated film is heat sealed with each sealant layer (23). It is a packaging bag which forms and seals a side seal portion (8, 8) and a bottom seal portion (9), and an unsealed portion (4a) is placed on the overlapping portion on the bottom seal portion (9) side to be heat sealed. Left seal part (4) having unsealed part (3a) A central seal part (3) of the pattern seal portion formed by sealing in a pattern consisting of three regions of the right seal portion (5) is provided with an unsealed portion (5a).

Furthermore, on the inner surface of the sealant layer (23), a peelable tape material (6) showing an easy peelability by an internal pressure of a gas such as water vapor generated by heating the packaging bag is provided at the pattern seal portion. Each unsealed portion (4a, 3a, 5a) is provided with a steam vent hole (7) penetrating over the peelable tape material (6), and the bottom seal portion (9 ) Side is folded back to the front laminated film (2) side to form a folded portion (50), and both end edges of the bottom seal portion (9) of the folded portion (50) and both side edges of the front laminated film (2) are In a packaging bag having a vapor venting function that partially forms an adhesive part (16),
In particular, as shown in the enlarged view of FIG. 7, the white masking layer (24) of the front laminated film (2) constituting the folded portion (50) is parallel to the peelable tape material (6) interposed on the inner surface. It can also be set as the packaging bag which has the steam removal function which forms the white part (25) removed by predetermined width | variety.

Furthermore, the invention according to claim 5 is applied to a packaging bag having a vapor venting function of another form with respect to the inventions according to claims 1, 2, 3 and 4, for example, FIG. ) And a cross-sectional schematic diagram of FIG. 9 which is an enlarged view thereof, and a white concealing layer (24) is provided on the inner surface of the base film (20), as shown in FIG. Then, the back side laminated film (1) having the sealant layer (23) on the innermost surface is overlapped with the front side laminated film (2), and the bottom side of the back side laminated film (1) is Z-shaped folded. Part (55),
It is a packaging bag which heat seals around the edge part of the laminated film with each sealant layer (23) to form a side seal part (8, 8) and a bottom seal part (9) and seal the heat. A left seal portion (4) having an unsealed portion (4a) in a superimposed portion on the bottom seal portion (9) side, a central seal portion (3) having an unsealed portion (3a), and an unsealed portion A pattern seal portion is provided that is sealed in a pattern consisting of three regions of the right seal portion (5) having (5a).

Further, on the inner surface, a peelable tape material (6) showing an easy peelability by an internal pressure by a gas such as water vapor generated by heating the packaging bag is sealed to the sealant layer (23) at the pattern seal portion. And a non-sealed portion (4a, 3a, 5a) having a steam venting function in which a steam vent hole (7) penetrating over the peelable tape material (6) is formed in each unsealed portion (4a, 3a, 5a). In
As shown in FIG. 8, the white hiding layer (24) on the bottom seal portion (9) side of the back side laminated film (1) has a predetermined width parallel to the peelable tape material (6) interposed on the inner surface. It can also be set as the packaging bag which has the steam removal function which forms the removed white part (25).

  Further, the invention according to claim 6 is, for example, as shown in a plan view of FIG. 10A and a cross-sectional view of FIG. The white portion (25) formed in the concealing layer (24) has an inner upper end of the left seal portion (4) having an unsealed portion (4a) and the right seal portion (5) having an unsealed portion (5a). The width (W) does not appear below (4b, 5b).

  Thus, the white portion (25) formed in the white hiding layer (24) protrudes below the uppermost portions (4b, 5b) at the lower ends of the left seal portion (4) and the right seal portion (5). By setting the width (W) not to be large, the state of the peelable tape material (6) intervening in the inside can be visually confirmed, such as twisting and displacement, and the lower end of the white portion (25) having the width (W) However, if it comes out below the uppermost part (4b, 5b) at the lower end of each seal part (4, 5), the contents (curry etc.) will be visible from the outside, which is not preferable.

  Furthermore, in the invention according to claim 7, for example, as shown in FIG. 2 (a), in addition to making the steam vent hole (7) into a slit shape, a notch or a plurality of small holes, although not particularly shown, The shape can be adapted to the contents.

  Below, the material which comprises the packaging bag which has the steam removal function of this invention, its manufacturing method, etc. are demonstrated.

  First, as the front and back side laminated films (2, 1) and the bottom side laminated film (33) constituting the packaging bag having a vapor venting function of the present invention, for example, as shown in the side sectional view of FIG. On the back side of the film (20), a printed layer (21) such as letters and pictures, the printed layer (21) is lifted and a white hiding layer (24) for hiding the contents is applied, and an intermediate layer (22) is formed. The sealant layer (23) is generally applied to the innermost layer.

  As said base film (20), it is a layer used as the base material of the packaging bag which has a vapor release function, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, etc.) Polyamide (nylon-6, nylon-66, -polyimide, etc.) or the like, or a copolymer of these polymers can be used as a relatively heat-resistant film usually used as a packaging material.

Examples of the base film (20) include an antistatic agent, an ultraviolet absorber, a plasticizer, a lubricant,
A known additive such as a colorant can be added. Furthermore, the surface of the base film (20) is subjected to surface modification such as corona discharge treatment or anchor treatment, and a printing layer (21) described later. And the adhesion to the white hiding layer (24) and the like can be improved.

  Moreover, the said printing layer (21) can be formed by those printing methods using gravure ink or a flexo ink, Furthermore, the said white hiding layer (24) is white ink for gravure (for example, Fine Star LP Super: LP-GT (manufactured by Toyo Ink Mfg. Co., Ltd.)) or flexographic white ink can be used for pattern printing as a pattern having a white portion (25) by these printing methods.

  The intermediate layer (22) is laminated when it is necessary to improve the drop strength, puncture strength and gas barrier properties. For example, a nylon film or a polyester film is preferably used. An inorganic compound such as silicon or aluminum oxide may be deposited to form a transparent gas barrier layer.

  Moreover, as said sealant layer (23), what is necessary is just a resin which has heat-fusion property, such as polyethylene, a polypropylene, an ethylene copolymer, a saturated polyester, and when considering microwave suitability especially, it is about 50-80 micrometers as thickness. The polypropylene resin is more preferably used.

  Moreover, as a peelable tape material (6) used for the packaging bag which has the steam release function of the present invention, for example, as shown in the side sectional view of FIG. The tape material which consists of two layers of the adhesive resin layer (28) to show and the peelable resin layer (27) which shows easy peelability by the pressure of the vapor | steam generated by heating a packaging bag is mentioned.

  As the adhesive resin layer (28), a heat-sealable adhesive thermoplastic resin constituting the sealant layer (23) of the front and back side laminated films (2, 1) can be used as it is. A layer made of a propylene-based polymer (copolymer or terpopolymer) called CPP or linear low-density polyethylene (LLDPE, LDPE) is preferably used, and the thickness is often 20 to 150 μm.

  Moreover, as said peelable resin layer (27), for example, a block polypropylene copolymer, a random polypropylene copolymer, an ethylene copolymer such as ethylene / vinyl acetate, and the like are preferably used. In particular, a copolymer having an ethylene component content of 85 to 98% by weight is desirable.

  The method for laminating the adhesive resin layer (28) and the peelable resin layer (27) is not particularly limited, and examples thereof include dry lamination, extrusion coating, and coextrusion methods. It can be set as a peelable tape material (6).

  For example, as shown in FIG. 1, the packaging bag having the above-described configuration is filled with contents (40) such as curry, and the top side is sealed to form the top side sealing portion (15). When this is made into a bag and heated in a microwave oven, the peelable tape material (6) intervening on the folded inner surface of the front laminated film (2) is heated with the water vapor generated by the internal pressure (43) due to heating. It is possible to make a packaging bag having a vapor venting function that peels off from the sealant layer and automatically discharges water vapor generated by heating from the vapor vent hole (7). In particular, in the present invention, during the manufacture of the bag, A packaging bag having a steam venting function that can reliably detect the presence of defective products and the like.

It is a cross-sectional schematic diagram which shows the state when what filled the contents into the packaging bag which has a steam removal function which is an example of this invention is heated with the microwave oven etc. FIG. An example of the packaging bag which has a steam release function of this invention is demonstrated, (a) is the top view, (b) is sectional drawing showing the BB surface of (a). One example of a packaging bag having a steam venting function according to the present invention will be described, and is an enlarged schematic view of a partial region E shown in FIG. The other example of the packaging bag which has the steam release function of this invention is demonstrated, (a) is the top view, (b) is sectional drawing showing the BB surface of (a). is there. Another example of the packaging bag having a steam venting function according to the present invention will be described, and is an enlarged schematic view of a partial region F shown in FIG. The other example of the packaging bag which has the steam release function of this invention is demonstrated, (a) is the top view, (b) is sectional drawing showing the BB surface of (a). is there. The other example of the packaging bag which has the steam release function of this invention is demonstrated, and is an enlarged schematic diagram of the partial area | region G shown in FIG.6 (b). The other example of the packaging bag which has the steam release function of this invention is demonstrated, (a) is the top view, (b) is sectional drawing showing the BB surface of (a). is there. Another example of the packaging bag having a steam venting function according to the present invention will be described, and is an enlarged schematic view of a partial region H shown in FIG. In one example of a packaging bag having a vapor venting function of the present invention, showing a whitened portion of a white hiding layer formed on the folded surface, (a) is a plan view thereof, (b), It is sectional drawing showing the BB surface of (a). It is a sectional side view which shows an example of the laminated | multilayer film which comprises the packaging bag which has a steam release function of this invention. It is a sectional side view which shows an example of the peelable tape material which comprises the packaging bag which has a steam release function of this invention. It is a perspective view explaining an example of the conventional steam release packaging bag. It is a perspective view explaining an example of the conventional steam release packaging bag. It is a perspective view explaining an example of the conventional steam release packaging bag. An example of a conventional packaging bag having a steam venting function will be described, in which (a) is a plan view thereof and (b) is a cross-sectional view showing a BB plane of (a). FIG. 17 is an enlarged schematic view of a partial region E shown in FIG. 16B, illustrating an example of a conventional packaging bag having a steam venting function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Back side laminated film 2 ... Front side laminated film 2a ... Outer folded part 2b ... Inside folded part 3 ... Center seal part 3a ... Unsealed part of center seal part 4 ... Left seal part 4a ... Left Unsealed part of seal part 4b ... Inner uppermost end of left seal part 5 ... Right seal part 5a ... Unsealed part of right seal part 5b ... Inner uppermost end of right seal part 6 ... Stripping tape material 7 Vapor vent 8 Side seal portion 9 Bottom seal portion 11 Folded portion of front laminated film 15 Top seal portion 16 Partially bonded portion 17 Top seal portion 20 Base film 21 ... Printing layer 22 ... Intermediate layer 23 ... Sealant layer 24 ... White hiding layer 25 ... White area of white hiding layer 27 ... Easily peelable resin layer 28 ... Adhesive resin layer 33 ... Bottom side laminated film 40 ... Contents 42 ... Steam 43 ... Internal pressure 50 ... Folded part 55 ... Z-shaped folded part 100 ... Conventional laminated film 101 of the packaging bag ... Both ends 102 of the conventional laminated film of the packaging bag ... Conventional packaging bag laminated film heat seal part 103 ... Conventional packaging bag laminated film bottom heat seal part 104 ... Conventional packaging bag laminated film heat seal part 105 ... Housed in a conventional packaging bag Contents 106 ... Conventional packaging bag W ... Width of peelable tape material

Claims (7)

A back side laminated film and a front side laminated film having a white hiding layer at least on the inner surface of the base film and having a sealant layer on the innermost surface are superposed, and the V-shaped inner folded portion and outer folded portion are formed on the front laminated film. A wrapping bag in which the periphery of the end portion of the overlap film is sealed by heat sealing with the sealant layer, and the inner folded portion and the outer folded portion are folded and overlapped. A pattern seal portion having at least one unsealed portion is provided, and the inner surface of the folded and overlapped portion is easily subjected to internal pressure by a gas such as water vapor generated by heating the packaging bag against the sealant layer. A peelable tape material exhibiting peelability is sealed and interposed by the pattern seal portion, and the unsealed portion spans the peelable tape material. A packaging bag having a venting function venting holes penetrating are bored,
The white concealment layer of the front side laminated film of the inner folded portion surface constituting the folded overlap portion forms a white portion that is removed by a predetermined width in parallel with the peelable tape material interposed on the inner surface. A packaging bag having a steam venting function. At least one laminated film having a white hiding layer on the inner surface of the base film and a sealant layer on the innermost surface is folded in the lateral direction to form a back-side laminated film and a front-side laminated film, and the back-side laminated film and the front-side laminated film It is a packaging bag having a V-shaped inner folded portion and an outer folded portion on the front laminated film, and the periphery of the end portion of the superimposed film is sealed by heat sealing with the sealant layer. The inner folded portion and the outer folded portion are folded and overlapped, the folded overlap portion is provided with a pattern seal portion having at least one unsealed portion, and further on the inner surface of the folded overlap portion, A releasable tape that exhibits easy releasability to the sealant layer by an internal pressure of a gas such as water vapor generated by heating a packaging bag. But it interposed sealed by the pattern seal portion, wherein the unsealed portions in the packaging bag having a venting function venting holes penetrating over the peeling tape material is bored,
The white concealment layer of the front side laminated film of the inner folded portion surface constituting the folded overlap portion forms a white portion that is removed by a predetermined width in parallel with the peelable tape material interposed on the inner surface. A packaging bag having a steam venting function. It consists of a front side laminated film, a back side laminated film, and a bottom side laminated film having at least a white hiding layer on the inner surface of the base film and a sealant layer on the innermost surface. The front side laminated film and the back side laminated film are placed inside the sealant layer. And the back side laminated film is folded back in the lateral direction so that the sealant layer is exposed on the outside to form a folded portion and superimposed on the back side laminated film, and the folded side portion of the front side laminated film and the back side A packaging bag in which a portion where the sealant layer is exposed without overlapping with the front side laminated film of the laminated film is overlaid with the bottom side laminated film, and the periphery of the end portion of the laminated film is sealed by heat sealing with the sealant layer In the overlapping portion of the folded portion of the front side laminated film and the bottom side laminated film, there are few A pattern seal portion having one unsealed portion is provided, and the inner surface of the sealant layer has releasability that is easily peelable by an internal pressure of a gas such as water vapor generated by heating the packaging bag. In a packaging bag having a vapor venting function in which a tape material is sealed and interposed by the pattern seal portion, and a vapor vent hole penetrating through the peelable tape material is formed in the unsealed portion,
Vapor venting function, wherein the white concealing layer on the folded portion surface of the front side laminated film forms a whitened portion removed by a predetermined width in parallel with the peelable tape material present on the inner surface Having a packaging bag. At least a back side laminated film having a white hiding layer on the inner surface of the base film and a sealant layer on the innermost surface is laminated with the front side laminated film, and the periphery of the end portion of the laminated film is sealed by heat sealing with the sealant layer. And a pattern seal portion having at least one unsealed portion is provided in the overlapped portion on the lower side to be heat-sealed, and further, the inner surface is packaged against the sealant layer. A peelable tape material that is easily peelable by the internal pressure of a gas such as water vapor generated by heating the bag is sealed and interposed by the pattern seal portion, and penetrates the peelable tape material through the unsealed portion. A steam vent hole is formed, and the bottom side is folded back to the front laminated film side to form a folded portion, and the bottom side seal portion of the folded portion is formed. A packaging bag having a venting function both side edges of the edge between the front and rear laminated film is partially bonded,
Vapor removal characterized in that the white masking layer of the front side laminated film constituting the folded portion forms a whitened portion removed by a predetermined width in parallel with the peelable tape material interposed on the inner surface. Functional packaging bag. At least a back side laminated film having a white hiding layer on the inner surface of the base film and a sealant layer on the innermost surface is superposed on the front side laminated film, and a Z-shaped folded portion is provided on the bottom side of the back side laminated film. A pattern bag having at least one unsealed portion in the overlapping portion on the bottom side to be heat-sealed, which is a packaging bag for sealing the periphery of the end portion of the overlapping film with the sealant layer by heat sealing Further, on the inner surface, a peelable tape material that is easily peelable by an internal pressure of a gas such as water vapor generated by heating the packaging bag is sealed with the pattern seal portion on the inner surface of the sealant layer. In a packaging bag having a steam venting function in which a steam vent hole penetrating over the peelable tape material is formed in the unsealed portion,
A vapor condensing function characterized in that the white concealing layer on the bottom side of the back side laminated film forms a whitened portion removed by a predetermined width in parallel with the peelable tape material present on the inner surface. Having packaging bag.   6. The white portion formed in the white hiding layer has a width that does not protrude from the inner top end of the pattern seal portion inside the unsealed portion. A packaging bag having the described steam venting function.   The packaging bag having a steam venting function according to any one of claims 1 to 6, wherein the steam vent hole is any one of a small hole, a notch or a slit.

Images