JPH0780503B2 - Packaging bag that can sterilize heated gas - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a packaging bag used for sterilizing and packaging a filling such as food by blowing a heating gas such as steam.

(Prior Art) Japanese Patent Application Laid-Open No. 50-64445 discloses a conventional packaging bag.
Some are disclosed in Japanese Patent Publication. This is to form a rectangular bag by sealing the edges by bending and welding, and to provide a welded portion near the corner of this bag with a steam inflow unwelded portion that is oriented in a direction orthogonal to the edge of the bag. It is a thing. This packaging bag is sealed by filling a filling material, allowing steam to flow therein, and sterilizing it, and then forming a sealing welding portion inside the welding portion close thereto.

(Problems to be Solved by the Invention) In the above-mentioned conventional packaging bag, the steam inflow unwelded portion is provided near the end of the welded portion in a direction orthogonal to the welding edge. The vapor does not reach the entire filling material, and sterilization of the central portion of the filling material may be incomplete. In addition, since the front sheet material and the back sheet material of the packaging bag are not partially sealed in the unwelded portion in the longitudinal direction of the welded portion, the vicinity of the unsealed portion when forming the sealing welded portion There is a problem that wrinkles easily occur. further,
Since the outside of the welded portion of the conventional packaging bag described above is cut without extending the packaging bag material at all, after sterilization, water droplets formed on the top of the sterilization tank are near the unwelded portion for steam inflow. There was a problem that it dropped and penetrated into the inside of the packaging bag through the unwelded portion to make the welding incomplete, and it was not preferable for the quality preservation of the filling.

The present invention has been made in view of the above-mentioned problems of the conventional packaging bag, and can perform heating gas sterilization efficiently, and the filler does not come out of the packaging bag during sterilization. , Wrinkles do not occur in the sheet material when welding after sterilization, that is, welding for closing the unwelded portion for blowing heated gas,
It is another object of the present invention to provide a packaging bag that can sterilize heated gas without the risk of water or the like entering from the unwelded portion for blowing heated gas.

(Structure of the Invention) A feature of the structure of a packaging bag capable of sterilizing heated gas according to the present invention that achieves the above-mentioned object is that heating is performed by stacking a front sheet material and a back sheet material having a synthetic resin layer. In the packaging bag capable of gas sterilization, the upper, lower, left and right edges are sealed except at least one unwelded portion for blowing heated gas, and the unwelded portion is a corner of the packaging bag or the vicinity thereof. Is located at an angle toward the center of the packaging bag, and the front sheet material projects to the outside of the back sheet material at least in the vicinity of the unwelded portion.

(Example) Hereinafter, the Example of this invention is described based on drawing. As shown in FIG. 2, the packaging bag material 10 of the first embodiment has a front packaging bag material, that is, a front sheet material 1 and a back packaging bag material, that is, a back sheet material 2, which are overlapped with each other, and the welded portions 4 are formed on the three edges. Is formed, and the other end edge is left open to form the filling opening 6. At the edge of the filling opening 6, the back sheet material 2 ends at the terminal end of the welded portion 4, but the front sheet 1 has a protruding portion 8, that is, the front sheet material 1 is more than the back sheet material 2. It extends to the outside.

As shown in FIG. 3, the packaging bag material 10 is filled with a filling C such as spaghetti from the filling opening 6, and then the filling opening 6 is filled with the unwelded portion 22 for blowing heated gas. The remaining portion is welded to form the first sealing portion 24. Here, the unwelded portion 22 for blowing heated gas is provided by a known method such as welding with a paper interposed at a predetermined portion between the front sheet material 1 and the back sheet material 1. It is formed in the vicinity of the end of the sealing portion 24 so as to face the center of the packaging bag material 10. Then, steam is blown through the unwelded portion 22 for blowing heated gas to sterilize the filling C with steam. The sterilization may be performed using heated air instead of steam.

Subsequently, as shown in FIG. 1, a second sealing portion 26 formed by welding is formed inside the first sealing portion 24 in parallel with the first sealing portion 24 and the packaging bag 20 is formed.
Completely seal. As a method for sealing the packaging bag 20, it is possible to simply weld and seal the unwelded portion 22 for blowing heated gas.

In addition, in the first embodiment, the unwelded portion 22 for blowing heated gas is provided only at one place, but it is provided at two places near both ends of the first sealed portion 24 so that steam sterilization can be performed efficiently. You can also do it. However, when the unwelded portion for blowing heated gas is provided in the middle portion of the first sealing portion 24, there is a possibility that the filling material may come out from here.

In the second embodiment, as shown in FIG. 4, the packaging bag material 30 is
An unwelded portion 38 for blowing heated gas is formed in the vicinity of a corner of a welded portion 36 formed on the three edges of the front sheet material 32 and the back sheet material 34. At the edge where the heated gas blowing unwelded portion 38 is formed, the back sheet material 34 ends at the welded portion 36, but the front sheet material 32 is provided with the protruding portion 40 and extends to the outside of the welded portion 36. is doing.

As shown in FIG. 5, the packing bag material 30 is filled with the filler C from the filling opening 42, and the filling opening 42 is welded to form the first sealing portion 44 to form the packing bag. 50 are formed. Then, the filler C is steam sterilized through the unwelded portion 38 for blowing heated gas. Further, as shown in FIG. 6, a second sealing portion 52 is formed by welding inside the unwelded portion 38 for blowing heated gas to seal the packaging bag 50. Also in the second embodiment, the heating gas blowing unwelded portion may be provided at two or more places, or the heating gas blowing unwelded portion itself may be sealed by welding, as in the first embodiment. is there.

In the above-mentioned examples, the front sheet material and the back sheet material include polyester / polypropylene, nylon / polypropylene, polyester / aluminum vapor-deposited polyester / polypropylene, polypropylene / polyethylene, etc. An aluminum foil laminated with a synthetic resin film can be used.

Further, in the above embodiment, an example in which the filling C is sterilized by steam has been described, but it is obvious to those skilled in the art that the present invention can be effectively carried out by using other gas such as heated air instead of steam. Is.

Furthermore, the size of the non-welded part for blowing heated gas depends on the size of the packaging bag and the shape and size of the food products filled inside, but the food products inside will not be removed during the process until sealing. It must be small enough not to get out of the room and large enough to allow the flow of steam or heated air. For example, the upper and lower edges have a length of 27 cm, the left and right edges have a length of 17 cm, spaghetti is filled inside, and steam holes are provided one at each of the left and right edges. For example, the length on the edge of the unwelded portion for blowing heated gas is suitably 0.5 to 2.0 cm.

(Effects of the Invention) As described above, the present invention forms the holes for heating gas inflow in the corner portions of the packaging bag with the central portion of the packaging bag facing the corner portion.
The heated gas is blown toward the center of the filling, and the heating gas sterilization can be efficiently performed, and the filling does not come out of the packaging bag during sterilization. Further, no wrinkles are generated in the sheet material when sealing after sterilization, that is, when sealing the unwelded portion for blowing heated gas by welding. Furthermore, by projecting the upper sheet material near the unwelded portion for heating gas blowing to the outside of the lower sheet material, water droplets and the like that drip into the packaging bag can flow from the unwelded portion for heating gas blowing to the inside. It has the advantage that it can be prevented from entering.

[Brief description of drawings]

FIGS. 1 to 3 show a first embodiment of the present invention, FIG. 1 is a plan view of a packaging bag after sealing, FIG. 2 is a plan view of packaging bag material, and FIG. A plan view of the packaging bag after that, FIGS. 4 to 6 show a second embodiment, FIG. 4 is a plan view of the packaging bag material, and FIG. 5 is a plan view of the packaging bag after the filling is filled. FIG. 6 is a plan view of the packaging bag after sealing. 1 ... Front sheet material, 2 ... Back sheet material, 4, 36 ... Welded portion, 8, 40 ... Projection portion, 10, 30 ... Packaging bag material, 20, 50
...... Packing bag, 22, 38 …… Unwelded part for blowing heated gas, C
…… Filling material.

Claims (1)

[Claims] 1. A packaging bag capable of sterilizing heated gas, which comprises a front sheet material and a back sheet material having a synthetic resin layer superposed on each other, and at least one of the upper, lower, left and right edges thereof is an unwelded portion for blowing heated gas. The non-welded portion is located at or near the corner of the packaging bag and is inclined toward the center of the packaging bag, and at least in the vicinity of the non-welded portion. A packaging bag that can be sterilized by heated gas, characterized in that the front sheet material projects to the outside from the back sheet material.