JP2013023273A - Sealed packaging bag for foods - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed packaging bag having an effect for preventing its explosion that can be put into a microwave oven and heated there.SOLUTION: The packaging bag being a sealed packaging bag (10) for foods which is formed of a laminated film formed of a soft film and a hard film, set in a microwave oven, and heated there, wherein an end part of the laminated film coated with a hot-melt adhesive agent layer (13) at its inner surface is placed on the upper surface of the bag and the part coated with the adhesive agent layer is formed with holes (3) passing through the soft film, hard film and hot-melt adhesive agent layer.

Description

  The present invention relates to a sealed packaging bag that is used when heated in a microwave oven. Especially when heated inside a microwave oven, the moisture generated from the food is released locally when the internal pressure rises, and the internal water vapor is discharged to prevent explosive bursting. It relates to sealed packaging bags for food.

  Recently, many consumers have been demanding food that is cooked and warmed in a microwave oven. However, when food in a sealed package is heated in a microwave oven, the bag may expand and explode if the pressure inside the package increases due to moisture generated in the sealed package. Heated in a microwave. The pouch is heated either sideways or sideways in the form of a three-sided sealed pouch or a stand-up pouch.

  In general, food sealing bags have an inner surface made of a soft film such as a sealant film, and an outer surface made of a hard film such as a pet film or a nylon film. The surface of the film excluding the opening is compressed to form a bag, and after the contents are put inside, the opening is heated and compressed to be sealed. The sealed bag of food has a strength of 3 to 8 kg / 15 mm on the heat-compressed surface.

  Various types of bags have been developed in order to solve the inconvenient problem of transferring the contents of sealed food packaging bags to other containers and heating them. This development is based on the principle that when the internal pressure rises when the internal pressure rises, the water inside the bag is discharged to the outside from the low-strength part when the sealing strength of the sealed part is adjusted weakly and heated in a microwave oven. Progressing.

  Among the bags developed in this way, there is a bag in which a valve for discharging water vapor inside is installed on the upper surface or a part of the upper portion of the bag. This bag must be additionally provided with a process for attaching a valve for discharging the water vapor inside, and there is a problem in supplying the bag manufacturing film in a roll state, which makes it difficult to manufacture the bag.

  In addition, a sealed bag has been developed in which an easy peel film is inserted in the form of a band on the top or top of the bag so that when the pressure inside the bag rises, water vapor is discharged through the easy peel band. It was done. In this bag, an adhesive portion in which an easy peel band protruding in the lateral direction is inserted is formed on the upper surface of the bag, and holes are formed on the left and right sides of the adhesive portion. And the non-adhesion part connected with a bag is formed in the adhesion part in which the easy peel band was inserted so that water vapor | steam inside may be disperse | distributed to the right and left of a center adhesion part.

  In this sealed bag of food, the strength of the portion heated and compressed in all directions is 3 to 8 kg / 15 mm, but the portion where the easy peel band is inserted has an actual strength of about 1 kg / 15 mm. When pressure due to water vapor is generated inside the bag, the right and left easy peel band portions are opened while the water vapor inside the bag is dispersed to the left and right through the non-bonded portion, and the water vapor passes through the holes formed in the easy peel band. It will be discharged to the outside through the left and right holes. The sealed bag for food must be formed on the upper surface of the bag with an adhesive portion having an easy-peel adhesive band inserted therein. Therefore, using special equipment, and easy peel band is manufactured and inserted separately, the production cost becomes higher than the normal bag manufacturing cost.

  In the Korean Utility Model Registration No. 20-0192376, a microwave oven made by installing several holes with a diameter of 0.2mm to 0.5mm in a part of the wrapping paper and sealing these fine holes with hot melt adhesive tape. Hermetically sealed food packaging materials have been released. This sealed wrapping material is produced separately by preparing a heat-meltable adhesive tape, and preparing a heat-meltable adhesive tape to adhere it to the hole position of the perforated bag. A lot of manpower is required to adhere, there is a problem that conventional equipment for manufacturing bags by a batch process cannot be used, and the system and equipment must be changed. In particular, the sealed food packaging material of the above-mentioned device has been devised so that it can be used for a packaging container that covers the upper surface of a solid container, and there is a problem in applying it to a commonly used vinyl bag.

  The present invention solves the above-mentioned problems and can be manufactured using conventional equipment, and when heated inside a microwave oven, water vapor is easily discharged from the bonded portion of the bag, causing explosive bursting due to water vapor pressure. Developed to provide no bags.

An object of the present invention is to provide a food-sealed packaging bag that can be manufactured by a simple and inexpensive method and in which water vapor generated from food is easily discharged when heated in a microwave oven.
The object of the present invention described above is to form a hot melt adhesive portion at the adhesive interface of the adhesive portion on one side or both sides of the upper portion of the food packaging bag in the normal form, and cut the portion close to the adhesive portion or the adhesive portion. This is achieved by the food-sealed packaging bag of the present invention, in which when the pressure of water vapor inside the bag rises, the hot melt part is easily opened and the water vapor is discharged to the outside when the bag is heated in a microwave oven. .

The food packaging bag of the present invention uses a laminate film used in ordinary food packaging bags. For example, the inner surface is composed of a soft film and a hard film.
Sealant film made of soft film, such as polypropylene film or polyethylene film, especially LLDPE film, outer surface is made of polyethylene terephthalate (PET) or nylon (NYLON), and the entire surface of the bag is heated and compressed to about 3 to 8 kg / 15 mm Bonded to have a strength of.

  According to the present invention, the hot melt adhesive is applied to the LLDPE film in the laminated film constituting the side wall of the bag, and the LLDPE layers of the opposing films are heated and compressed to be bonded to each other through the hot melt adhesive layer. I made it. Therefore, the two LLDPE films on both walls are bonded together with the hot melt adhesive layer sandwiched between them.

  The hot melt adhesive used in the present invention is used by mixing 5 to 30 parts by weight of a wax used for food additives such as polyethylene wax with 100 parts by weight of EVA having a vinyl acetate content of 30 to 50% and dissolving it in a solvent. The portion to which the hot melt adhesive is applied has an adhesive strength of 100 g / 15 mm to 800 g / 15 mm.

  The adhesive strength of the part to which such a hot melt adhesive is applied appears weaker than the part to which the LLDPE film is adhered while being fused. Therefore, when the pressure inside the bag increases, the portion to which the hot melt adhesive is applied is separated before the other portions. According to this configuration, the adhesive part bonded through hot melt has a lower adhesive strength than other adhesive parts formed by heat compression of the LLDPE film, so when the sealed packaging bag is heated in a microwave oven, the pressure inside the bag increases. A hole through which the internal gas is discharged is formed while the walls on both sides of the bag are opened from the portion where the hot melt adhesive is applied by the internal gas pressure. At the moment when the gas is discharged, since the water vapor inside the hole is discharged to the outside while the small hole is formed, the explosive burst of the bag does not appear.

  The above-mentioned hot melt adhesive is applied to the inner surface of the LLDPE film constituting the inner surface of the side wall of the bag in the form of a lateral band so that when the two films are heated and compressed, hot melt adhesion occurs only at the heated compression portion. It is also possible to make it. Moreover, it is also possible to apply only the portion where the two films are heat-compressed as the hot-melt adhesive portion so that only the adhesive portion formed by heat-compression of the side portion of the bag is formed.

  The method of applying the hot melt adhesive in the form of a band in the transverse direction can be simplified in the bag manufacturing process because the hot melt adhesive is applied in the form of a band to the laminating film supplied in the form of a roll in the bag manufacturing stage. There are advantages. However, this method has a problem that more hot-melt adhesive is required.

  The method of applying the hot melt adhesive only to the adhesive part of the two films is to apply the hot melt and the adhesive at a certain interval on one or both sides of the film supplied in a roll state. Only the adhesive part of one film is applied. This method has the advantage that the amount of hot melt adhesive used can be reduced.

  The food-sealed packaging bag according to the present invention, when food is put inside and heated, when the internal pressure rises due to water vapor, a small hole is formed that connects the outside surface to the outside while the inside of the hot-melt adhesive part having a low strength opens. Internal steam is discharged to the outside and no explosive burst occurs.

  According to the present invention, a cut-off portion or a hole is formed in a portion where the hot melt adhesive is applied, and the bonding area is smaller than that of other hot melt bonded portions. According to this configuration, when the pressure inside the bag rises, a feature appears that water vapor gradually leaks because the hot melt adhesion area is temporarily opened from a small area of the hot melt adhesion area.

According to the present invention, when a sealed bag containing food is put into a microwave oven and heated, when the internal vapor pressure rises, a groove or a hole portion having a small adhesive area even in a portion where a hot melt adhesive having a low adhesive strength is applied With this, a small hole is made while the adhesion is loosened, and the internal steam is discharged, so there is no effect of explosive bursting of the bag.
In particular, according to the present invention, since a bag can be manufactured by a simple method of applying a hot melt adhesive to the adhesive surface of the laminate film, the manufacturing cost of the bag can be reduced, and the existing equipment can be used without supplementing the mechanical equipment. There are advantages you can do.

The perspective view which shows the example of the laminated | multilayer film used for manufacture of the food-sealing packaging bag by this invention. The perspective view of the use condition of the bag manufactured using the laminated film of FIG. Sectional drawing of the hot-melt-adhesive-agent layer part cut by the AA line of FIG. It is a front view which shows the other example of the packaging bag by this invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a roll showing a laminated film before manufacturing a sealed packaging bag for food used for heating food in a microwave oven manufactured according to the present invention. According to the present invention, the bag film (1) has a hot melt adhesive layer (2) formed of a hot melt adhesive layer at one end, and the hot melt adhesive layer (2) has a number of elliptical shapes. Hole (3) is formed. This laminated film (1) is cut at the dotted line portion and used for manufacturing the food sealed packaging bag (10) of FIG.

  The process of forming the bag will be described. Hot melt in the length direction of the original fabric at one end of the LLDPE film (11) constituting the original laminate film (1) supplied from the original fabric roll (4). An adhesive is applied to form a hot melt adhesive layer (2), and holes (3) of an appropriate size are formed at regular intervals. Next, cut along the dotted line in Fig. 1 to fit the length of the bag, fold it in half along the dotted line in the length direction, and heat-compress the inner surfaces of both sides, so that the LLDPE bonded part and the hot melt bonded part together 2 to form the hermetically sealed food bag shown in FIG.

In the bag formed in this way, the part where the LLDPE layers are heat-sealed to each other has an adhesive strength of 3 to 8 kg / 15 mm, and the part bonded through the hot melt adhesive is 100 g / 15 mm to 800 g / 15 mm. have.
FIG. 3 is a cross-sectional view taken along line AA of FIG. 2. According to FIG. 3, the sealed packaging bag (10) for food is a laminated film in which an LLDPE film (11) and a PET film (12) are laminated. The LLDPE film (11) is arranged on the inner surface and the PET film (12) is arranged on the outer surface. According to FIG. 3, since the hot melt adhesive layer (13) is adhered to the inner surface of the LLDPE film (11) of the laminated film forming one side wall, the LLDPE is passed through the hot melt adhesive layer (13). The film (11 ′) is bonded. Also, the laminated film coated with the hot melt adhesive layer (13) has a hole (through the outer surface PET film (12), LLDPE film (11) and the hot melt adhesive layer (13) applied thereto ( 3). However, the LLDPE film (11 ′) and the PET film (12 ′) constituting the side wall of the bag bonded to the hot melt adhesive layer (13) have no holes.

  In such a configuration, when the pressure inside the bag is increased, moisture is discharged toward the narrow hole in the hot melt adhesive layer (13).

  FIG. 4 is a front view showing another example of the present invention. According to FIG. 4, the food sealing bag (20) has front and rear side walls formed as a laminated film composed of an LLDPE film and a PET film, and an upper opening. Both side surfaces and the bottom surface except for are adhered by heat welding of LLDPE film on the inner surface of the bag, and a zipper (21) is attached to the upper opening, and the food is put in, and then sealed with the zipper. A lateral hot-melt adhesive layer (22) is applied to the inner surface of the LLDPE film constituting one side wall or both side walls of the side walls. Grooves (23) are formed on both sides of the bag to which the hot melt adhesive layer (22) is applied, and the walls on both sides are also formed around the grooves with the hot melt adhesive layer (22) as a medium. It is glued to.

  According to this configuration, the portion where the adhesive layer (22) is not applied has an adhesive strength of 3 to 8 kg / 15 mm, but the portion bonded via the hot melt adhesive layer (22) is 100 g / 15 mm to It has an adhesive strength of 800 g / 15 mm. In particular, when a groove is formed on the side of the bag, when the internal pressure rises, the internal pressure concentrates on the groove (23) projecting inward and begins to open at the groove (23), thus reducing the risk of explosion. effective.

  The sealed package bag of food having this structure can be cooked for standing in a microwave oven, and when it is heated in the microwave oven, the bag is inflated by water vapor contained in the food. At this time, if the pressure inside the water vapor increases further, the part bonded with the hot melt adhesive layer (22), which has a weak adhesive strength, is separated to form a small hole, and the water vapor is emitted to the outside, and an explosive burst appears. Absent.

DESCRIPTION OF SYMBOLS 1 ... Film 2 ... Hot melt adhesive layer 3 ... Hole 10 ... Bag 11, 11 '... LLDPE film 12, 12' ... PET film 13, 22 ... Hot melt Adhesive layer 21 ... zipper 23 ... groove

Claims (5)

  Hot melt adhesive in the length direction of laminated film in laminated film for food sealed packaging bag, which is formed of laminated film laminated on the inner surface, sealed with flexible film, and heated inside microwave oven The layer (13) was applied, and a large number of holes (3) penetrating the laminated film (1) and the hot melt adhesive layer (13) were formed in the portion where the hot melt adhesive layer was applied. Laminated film for manufacturing sealed packaging bags of food.   In item 1 above, the laminated film is composed of an outer surface part made of a hard film selected from polyethylene terephthalate (PET) and nylon (NYLON) and an inner surface part made of a soft film selected from polypropylene and polyethylene. A laminated film for producing a hermetically sealed bag for food, characterized by being made.   In a food-sealed bag formed of a laminated film composed of a soft film and a hard film and heated horizontally inside a microwave oven, the end of the laminated film with the hot melt adhesive layer (13) applied on the inner surface is A hermetically sealed bag for food, characterized in that a hole is formed through the soft film, the hard film, and the hot melt adhesive layer in a portion on the top surface of the bag where the adhesive layer is applied.   In a food-sealed bag made of a laminated film composed of a soft film and a hard film and heated inside the microwave oven, both sides and bottom except for the opening at the top of the bag are sealed by heat fusion, The opening has a zipper (21), a hot melt adhesive layer (22) is formed on the inner surface of the laminated film below the zipper, and a groove (23) is formed on the surface coated with the adhesive layer (22). A sealed packaging bag of food characterized by that.   The sealed packaging bag for food according to item 3 or 4, wherein the hot melt adhesive layer (22) is composed of EVA and polyethylene wax.

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