JP2005280736A - Packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag free from leakage of contents even if the bag is filled with contents such as food, sealed and cooked in a microwave oven as it is. <P>SOLUTION: A fold having both surfaces of a double-layered tape with one of surfaces easily peelable covered with a front laminate material in a shape protruding upwardly is connected to a front side at a position close to an opposite side of an opening of a three-side-sealed bag having the opening on one side. A side seal, a safety valve seal consisting of a region surrounded by lines extending from an upper side of the fold linearly downward by a predetermined length, then bent to extend slantly toward the upper side by a predetermined length, and further bent to extend linearly to the upper side, a U-shaped seal, a safety valve seal of the same shape, and a side seal are successively connected with the fold in a breadthwise direction via unsealed portions. A through hole for discharging steam is provided on the unsealed portion surrounded by the safety valve seal and the U-shaped seal, and a heat-sealable part is provided at a position close to the lower end of the fold. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bag for packaging contents such as food.

In recent years, packaged foods of a type in which cooked or semi-cooked foods are filled and sealed in a packaging bag made of a laminated packaging material and heated and cooked in a microwave oven immediately before eating are often used. However, the conventional packaging bag used for the packaged food, when heated in a microwave oven in a state where the food is filled and sealed, breaks the bag due to internal pressure of water vapor generated from the food during heating, It had the drawbacks of being scattered and contaminating the inside of the microwave oven. In order to prevent the packaging bag from breaking when the microwave oven is heated, there is a method in which a portion of the packaging bag is cut out with a pair of scissors just before heating, and then heated, but in this case, a tool such as scissors is required. In addition to being bothersome, the steam generated at the time of heating is immediately released outside through the hole, so the steam cooking effect by steam is reduced and the drying of the food in the bag is advanced. This caused various types of deterioration such as taste. In order to solve the above-mentioned problems, a packaging bag is proposed in which even if a packaged food filled and sealed with food or the like is heated as it is in a microwave oven, the used bag is not easily broken (for example, see Patent Document 1). .).
JP-A-9-150864

  However, even the packaging bag proposed above has a problem that it peels off from the side seal portion of the packaging bag when heated in a microwave oven, and the filled food and the like leak from there.

  An object of the present invention is to provide a packaging bag in which contents such as food are filled and sealed, and even if the food is cooked as it is without being broken, the contents are not leaked.

  In the invention according to claim 1 of the present invention, a front laminated material and a back laminated material in which a sealant layer is laminated on one surface of a base layer composed of a single layer or a multilayer film, the sealant layers are Stacked so as to face each other, an opening is provided on one side, a heat seal part is provided on the other side, and the front side of the position adjacent to the opposite side of the opening of the bag is a polypropylene resin layer and an easy peel resin layer. Consists of a two-layer structure, rectangular tape of the same width as the width of the bag and the length of the easy-peeling resin layer is in contact with the contents. A protruding folded portion is provided in parallel with the opening, and a side seal portion, a safety valve seal portion, a U-shaped seal portion, a safety valve seal portion, and a side seal portion having a predetermined width from one end in the width direction to the folded portion. Each A through hole portion for discharging water vapor is provided in the unsealed portion surrounded by the safety valve seal portion and the U-shaped seal portion, and is further provided at the lower end of the folding portion. A packaging bag comprising a heat seal portion having a predetermined width parallel to an opening at a position adjacent thereto.

  The invention according to claim 2 of the present invention is the invention according to claim 1, wherein the safety valve seal portion is bent at a right angle from the upper side of the folding portion downward in a straight line and then bent in the upper side direction. It is a packaging bag characterized by consisting of what is surrounded by two lines that extend obliquely at a predetermined length and then bend and extend linearly to the upper side.

The invention according to claim 3 of the present invention is the invention according to claim 1 or 2, wherein the U-shaped seal portion is bent at a predetermined length downward from the upper side of the folding portion at a right angle and then bent to a predetermined length. It is a packaging bag characterized by consisting of what is surrounded by two lines that are bent and further bent and extended to the upper side.

  In the packaging bag of the present invention, the front laminate material and the back laminate material in which the sealant layer is laminated on one surface of the base layer made of a single layer or a multilayer film, the sealant layers face each other. Overlapping, with a two-layer configuration of a polypropylene resin layer and an easy peel resin layer on the front side of the position close to the opposite side of the bag opening with an opening on one side and a heat seal on the other side A rectangular tape of the same width as the width of the bag and a predetermined length is made so that the easy peel resin layer surface is in contact with the contents, and both sides of the tape are covered with a surface laminate material, and the shape protrudes upward The folding part is connected in parallel with the opening, and the side seal part, safety valve seal part, U-shaped seal part, safety valve seal part, and side seal part of a predetermined width from one end in the width direction are not sealed in the folding part. Through the department A continuous through-hole is provided in the width direction, and a through hole for discharging water vapor is provided in the unsealed part surrounded by the safety valve seal part and the U-shaped seal part, and is further opened at a position close to the lower end of the folding part. The safety valve seal part is linearly extended vertically downward at a predetermined length from the upper side of the folding part and then bent and predetermined obliquely in the upper side direction. The U-shaped seal portion is bent by a predetermined length extending downward at a right angle from the upper side of the folding portion. The bag is filled with food and other contents, and is heated in a microwave oven as it is. Even if you cook Bag is or leakage of contents and breakage, not to contaminate the inside of the microwave oven.

  The packaging bag of this invention is demonstrated below along embodiment. Fig.3 (a) is a sectional side view which shows one Embodiment of the laminated material for table | surfaces used for the packaging bag of this invention, and the laminated material for table | surfaces (20) is a base material which consists of a single layer or a multilayer film The adhesive layer (22) and the sealant layer (23) are laminated on one surface of the layer (21), and (b) is one of the backing laminate materials used in the packaging bag of the present invention. FIG. 2 is a side sectional view showing an embodiment in which a backing laminate material (20 ′) is composed of an adhesive layer (22 ′) and a sealant layer on one surface of a base layer (21 ′) made of a single layer or a multilayer film. (23 ') is laminated.

  The base layer (21, 21 ') is composed of a single layer or a multilayer film. Examples of the film used include a biaxially stretched polypropylene film having a thickness of 20 to 30 μm and a biaxial stretch having a thickness of 15 to 25 μm. A nylon film, a biaxially stretched polyester film having a thickness of 6 to 12 μm, or a vapor-deposited polyester film (thickness 6 to 12 μm) on which an inorganic oxide such as silicon oxide or aluminum oxide is deposited can be used. A laminated film in which an axially stretched nylon film, an unstretched nylon film, a biaxially stretched polyvinyl alcohol film (thickness 6 to 15 μm), an ethylene / vinyl alcohol film (thickness 6 to 20 μm), or the like can be used.

Generally, a polyurethane-based adhesive is used for the adhesive layer (22, 22 '). Usually, a two-component type is used in which a main component having a hydroxyl group and a curing agent having an isocyanate group are mixed in two components. The lamination is performed by a known gravure coating method. The coating amount is preferably 1 to 5 g / m ² (dry state).

The sealant layer (23, 23 ') is made of a heat-resistant polyolefin resin or polyolefin resin film. Examples of the resin include homopolypropylene resin, propylene-ethylene random copolymer, and propylene-ethylene block. Polypropylene resins such as copolymers and polypropylene-α-olefin copolymers can be used, and lamination is carried out by a known melt extrusion method or dry lamination method.

  FIG. 4 is a side sectional view showing an embodiment of a tape used in the packaging bag of the present invention. The tape (30) is composed of a two-layer structure of a polypropylene resin layer (31) and an easy peel resin layer (32). As the resin of the easy peel resin layer (32), a mixed resin of a polypropylene resin and a polyethylene resin is usually used. The thickness of the tape is 40-100 μm.

  FIG. 1 is a perspective view showing an embodiment of a packaging bag according to the present invention. The packaging bag (1) comprises the above-mentioned front laminated material (20) and back laminated material (20 ′) as the sealant layer. They are overlapped so that they face each other, and an opening (2) is provided on one side, heat seal parts (3, 4, 5) are provided on the other side, and in the vicinity of the opposite side of the opening (2) A rectangular tape (30) having a two-layer structure of a polypropylene resin layer (31) and an easy peel resin layer (32), having the same width as the lateral width of the packaging bag (1) and a predetermined length The easy-peeling resin layer (32) is in contact with the contents so that both sides of the tape (30) are covered with the surface laminate material (20), and the folded portion (10) protruding upward is formed. It is connected in parallel with the opening (2), and the width of the fold (10) is A side seal portion (11), a safety valve seal portion (13), a U-shaped seal portion (15), a safety valve seal portion (14), and a side seal portion (12) each having a predetermined width from one end of each are unsealed portions (16 ), And the unsealed portions (17a, 17b, 17c) surrounded by the safety valve seal portion (13), the U-shaped seal portion (15), and the safety valve seal portion (14). Are each provided with a through-hole portion (18) for discharging the generated water vapor, and further, a heat seal portion having a predetermined width parallel to the opening portion (2) at a position close to the lower end of the folding portion (10). (6) is provided. It should be noted that the portions other than the side seal portion (3) and the side seal portion (5) of the heat seal portion (6) are in a state in which only the surface laminate material (20) and the tape (30) are sealed.

  The safety valve seal portions (13) and (14) extend from the upper side (10a) of the folding portion (10) at a right angle downward in a straight line to a predetermined length, and then bend and predetermined obliquely in the upper side (10a) direction. The U-shaped seal portion (15) extends from the upper side (10a) of the folded portion (10), and is surrounded by two lines that are bent and further linearly extended to the upper side (10a). It consists of two lines that are bent at a right angle and then bent and then bent to a predetermined length, and further bent and extended to the upper side (10a). The internal pressure due to the water vapor derived from the contents generated in the bag during cooking is applied to the safety valve seal portions (13, 14) and the U-shaped seal portion (15), and the safety valve seal portions (13, 14) and U Seal (1 ) Of the folded portion of the sealant layer (23) of the surface laminate material and the easy peel resin layer (32) of the tape (30), the heat seal portions at both ends in the width direction of the bag (1) ( 3) and (5) are peeled off faster than the interface between the sealant layer (23 ') of the backing laminate material and the easy peel resin layer (32) of the tape (30), and the water vapor pierces the through hole (18). Since it passes through and is discharged outside, the packaging bag is not broken and the contents are prevented from leaking.

FIG. 2A is a cross-sectional explanatory view of the AA ′ plane in FIG. 1, and the folding portion (10) is in the thickness direction with the front laminated material (20) covering the tape (30) from both sides. The U-shaped sealing portion (15) is sealed in a state where the front laminated material (20), the tape (30), and the front laminated material (20) are stacked, and is surrounded by the U-shaped sealing portion (15). The laminated material for front (20) of the unsealed part (17b) has a through-hole part (18), and is laminated in the thickness direction at a position close to the lower end of the folded part (10). (20), having a heat seal part (6) in which the tape (30) is stacked and sealed, (b) is a cross-sectional explanatory view of the BB 'surface of FIG. 1, and the folding part (10) is In the state where the laminate material for the surface (20) covers the tape (30) from both sides, the laminate material for the surface (20) in order in the thickness direction. It has a safety valve seal part (14) sealed in a state where the tape (30) and the laminate material for the face (20) are overlapped, and is displayed in order in the thickness direction at a position close to the lower end of the folding part (10). (C) is a cross-sectional explanatory view of the CC ′ plane of FIG. 1, and includes a folding portion (20) and a heat seal portion (6) sealed with a tape (30). 10) In the state where the laminate material for the surface (20) covers the tape (30) from both sides, the laminate material for the table (20) and the tape in order in the thickness direction at a position close to the lower end of the folded portion (10). It has a heat seal part (6) sealed by overlapping (30).

  FIGS. 5 (a) to 5 (b) are diagrams for explaining the state when the packaged food of the present invention is filled with the contents and sealed, and the packaged food is heated in a microwave oven. When the one filled and sealed with (40) is heated in a microwave oven, the contents (40) are heated, the water evaporates, water vapor (41) is generated, an internal pressure is applied, and the bag expands. At that time, the safety valve seal portion and the U-shaped seal portion tape are separated at the interface between the surface of the easy peel resin layer (32) of the tape and the sealant layer surface (23) of the folded surface laminate material, and water vapor penetrates through the portion. Since it is discharged outside through the part (18), the packaging bag does not break and the contents do not leak outside.

It is a perspective view which shows one Embodiment of the packaging bag of this invention. (A) is sectional explanatory drawing of the AA 'surface of FIG. 1, (b) is sectional explanatory drawing of the BB' surface of FIG. 1, (c) is CC 'surface of FIG. FIG. (A) It is a sectional side view which shows one Embodiment of the surface laminated material used for the packaging bag of this invention, (b) is one embodiment of the back laminated material used for the packaging bag of this invention. It is a sectional side view shown. It is a sectional side view which shows one Embodiment of the tape used for the packaging bag of this invention. It is a figure for demonstrating a state when the packaged food which uses the packaging bag of this invention is heated with the microwave oven.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 2 ... Opening part 3, 4, 5, 6 ... Heat seal part 10 ... Folding part 10a ... Upper side 11,12 ... Folding part side seal part 13, 14 ... Safety valve sealing part 15 ... U-shaped sealing part 16 ... Unsealed portions 17a, 17b, 17c ... Unsealed portion 18 ... Through-hole portion 20 ... Front laminated material 20 '... Back laminated materials 21, 21' ... Base material layers 22, 22 '... Adhesive layer 23, 23 '... Sealant layer 30 ... Tape 31 ... Polypropylene resin layer 32 ... Easy peel resin layer 40 ... Contents 41 ... Water vapor

Claims (3)

  A laminate material for a front surface and a laminate material for a back surface in which a sealant layer is laminated on one surface of a base layer made of a single layer or a multilayer film are laminated so that the sealant layers face each other, and an opening is formed on one side. It has a two-layer structure consisting of a polypropylene resin layer and an easy-peeling resin layer on the front side close to the opposite side of the opening of the bag provided with a heat seal portion on the remaining side, and is the same as the width of the bag Cover the both sides of the tape with an easy-peeling resin layer surface in contact with the contents of a rectangular tape with a predetermined length in width, and the folded part with a shape protruding upward is parallel to the opening The side seal part, the safety valve seal part, the U-shaped seal part, the safety valve seal part, and the side seal part of the predetermined width from one end in the width direction to the folding part in the width direction through the unsealed parts, respectively. Sequential connection A through-hole portion for discharging water vapor is provided in an unsealed portion surrounded by the safety valve seal portion and the U-shaped seal portion, and a predetermined width parallel to the opening portion is provided at a position close to the lower end of the folding portion. A packaging bag comprising a heat seal portion.   Two of the safety valve seals which are bent at a predetermined length in a straight line downward from the upper side of the folding part at a right angle and then bent at a predetermined length obliquely in the upper side direction, and further bent and extended in a straight line to the upper side. The packaging bag according to claim 1, wherein the packaging bag is surrounded by a line.   The U-shaped seal portion is formed by being surrounded by two lines extending from the upper side of the folding portion at a right angle to the lower side by a predetermined length and then bent to a predetermined length and further bent to the upper side. The packaging bag according to claim 1 or claim 2, characterized by the above.

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