JP5966721B2 - Method for forming deaeration hole of packaging bag, sealing method for packaging bag, and pin for forming deaeration hole - Google Patents

Description

  The present invention relates to a method for forming deaeration holes of a packaging bag for containing granular materials such as rice or powders such as sugar, salt, flour, etc., a method for sealing a packaging bag, and a pin for forming deaeration holes.

  Conventionally, in a packaging bag for storing a granular material such as rice, in order to degas and seal the air remaining inside after storing the granular material, on the side facing the bag mouth to be filled with the granular material There is known an apparatus in which an air discharge part is provided, a bag is sealed by filling a granular material, the air discharge part is sealed after degassing from the air discharge part (Patent Document 1).

Japanese Patent Laid-Open No. 2001-80611

  However, in the above-described prior art, there is a problem that extra packaging bag material is required to provide the air discharge portion.

  Therefore, the present invention provides a method for forming a deaeration hole of a novel packaging bag that can be easily degassed and sealed after filling a granular material without using an extra material, and its It aims at providing the sealing method of the packaging bag using a formation method.

  The method for forming the deaeration holes of the packaging bag of the present invention is such that, after the pin having a substantially hemispherical tip is pierced into the packaging bag, the pin is pulled out from the packaging bag, thereby forming a substantially cylindrical shape on the outer surface of the packaging bag. A deaeration hole having a shape is formed.

  The sealing method of the packaging bag of the present invention is such that, after a pin having a substantially hemispherical tip is pierced into the packaging bag, the pin is pulled out of the packaging bag, thereby removing the substantially cylindrical shape from the outer surface of the packaging bag. The packaging bag is sealed by forming pores and thermally welding the deaeration holes after deaeration.

  The deaeration hole forming pin of the present invention is a deaeration hole forming pin used in the method for forming the deaeration hole of the packaging bag of the present invention, and is continuous from the distal end part to the proximal end side. The substantially cylindrical main body portion formed in this way, and the resistance when piercing the film forming the packaging bag is formed at the substantially central portion of the main body portion so that the resistance when pulling out from the film is increased. It is characterized by comprising the formed return portion.

  According to the method for forming deaeration holes of the packaging bag of the present invention, the substantially cylindrical deaeration holes can be easily formed on the outer surface of the packaging bag. Thereby, it becomes possible to easily deaerate after filling the granular material without using an extra material.

  According to the sealing method of the packaging bag of the present invention, the packaging bag can be easily sealed by forming a substantially cylindrical deaeration hole on the outer surface of the packaging bag and thermally welding the deaeration hole after deaeration. . Accordingly, it is possible to easily deaerate and seal after filling the granular material without using extra material.

  According to the deaeration hole forming pin of the present invention, the deaeration hole can be reliably formed in the deaeration hole forming method of the present invention.

3 is a front view of the vicinity of a tip portion of a deaeration hole forming pin of Example 1. FIG. 4 is an enlarged photograph of a tip portion of a pin used in Example 2. It is an enlarged photograph which shows the state which stabbed the pin in the packaging bag in Example 2. FIG. 4 is an enlarged photograph viewed from the front of a deaeration hole formed in Example 2. FIG. 6 is an enlarged photograph viewed from the side of the deaeration holes formed in Example 2. FIG. 4 is an enlarged photograph of a cross section of a deaeration hole formed in Example 2. FIG. 6 is an enlarged photograph viewed from the back surface of the deaeration holes formed in Example 2. FIG. It is an enlarged photograph of the section of the deaeration hole made into the sideways state in Example 3.

  The method for forming the deaeration holes of the packaging bag of the present invention is such that, after the packaging bag is pierced with a substantially cylindrical pin having a substantially hemispherical tip, the pin is pulled out of the packaging bag. A substantially cylindrical deaeration hole is formed on the surface.

  Here, when a substantially cylindrical pin having a substantially hemispherical tip is stabbed into the packaging bag, the film forming the packaging bag is torn at the tip of the pin, and the film extending in a substantially cylindrical shape on the side periphery of the pin Will be in close contact. Here, since the tip part of the pin has a substantially hemispherical shape, the film is surely stretched and closely adhered to the side peripheral part of the pin without being largely broken. And when the pin is pulled out from the film, the film stretched in close contact with the pin turns over in accordance with the movement of pulling out the pin, protrudes in the direction of pulling out the pin from the surface of the film, and a deaeration hole having a substantially cylindrical side surface is formed Is done. The details will be described in the second embodiment.

  Further, the sealing method of the packaging bag of the present invention includes a substantially cylindrical shape on the outer surface of the packaging bag by piercing the packaging bag with a pin having a substantially hemispherical tip and then pulling out the pin from the packaging bag. The degassing holes are formed, and the degassing holes are thermally welded after degassing to seal the packaging bag.

  Here, the packaging bag which is the object of the present invention is for transporting, storing, etc., various grains, such as grains such as rice, beans, and various powders such as sugar, salt, and wheat flour. In addition to the food applications described above, the packaging bag that is the subject of the present invention can be used for various granular materials for industrial use, such as plastic raw materials, and transportation and storage of powders. It is not limited to those.

  As the film forming the packaging bag, an unstretched film or a weakly stretched film is preferably used. As the non-stretched film, those using polypropylene as a main raw material and those using polyethylene as a main raw material are known, but are not limited to specific ones. The film forming the packaging bag may be a single layer film, a multilayer composite film, or a laminate film.

  Moreover, even if the packaging bag is formed by folding one sheet-like film and sealing two sides, the packaging bag is formed by stacking two sheet-like films and sealing three sides. Alternatively, it may be formed by sealing one side of a film previously formed in a tube shape.

  Hereinafter, the present invention will be described in detail based on specific examples.

  An embodiment of the deaeration hole forming pin of the present invention will be described.

  As shown in FIG. 1, the vicinity of the distal end portion of the deaeration hole forming pin of this embodiment has a substantially hemispherical distal end portion 1 and a substantially cylindrical shape continuously formed from the distal end portion 1 to the proximal end side. The main body portion 2 and a return portion 3 formed at a substantially central portion of the main body portion 2 are configured.

  The cross section of the main body 2 has an elliptical shape of 1 × 1.5 mm. Moreover, the surface of the front-end | tip part 3 is mirror-finished, and the surface of the main-body part 2 between the front-end | tip part 3 and the return part 3 is blasted.

  The return part 3 is formed to reliably reverse the film forming the packaging bag when the pin is pulled out. The cross-sectional shape of the return portion 3 is a shape in which a plurality of wedge shapes are arranged. The resistance when the pin is pierced is small, but the resistance when the pin is pulled out is increased. In addition, even if it does not form the return part 3, it is possible to implement the formation method of the deaeration hole of the packaging bag of this invention.

  As described above, the deaeration hole forming pin of the present embodiment is a deaeration hole forming pin used in the method for forming the deaeration hole of the packaging bag of the present invention, and has a substantially hemispherical tip 1 and the tip. The substantially cylindrical main body 2 formed continuously from the base 1 to the base end side, and the film formed at a substantially central portion of the main body 2 and having little resistance when piercing the film forming the packaging bag. It is comprised from the return | turning part 3 formed so that the resistance at the time of pulling out might become large, In the formation method of the deaeration hole of this invention, a deaeration hole can be formed reliably.

  As an unstretched film constituting the packaging bag, an LLDPE film having a thickness of 50 to 150 μm was prepared. A pin having the same shape as in Example 1 was prepared. The shape of the tip part of the pin actually used is shown in FIG.

  When the pin is inserted into the film while the pin is heated, as shown in FIG. 3, the film is torn at the tip of the pin, and the film extending in a substantially cylindrical shape is in close contact with the side periphery of the pin. It was.

  Next, when the pin is pulled out of the film at a faster speed than when the pin is pierced into the film, the film that is in close contact with the pin turns over in accordance with the movement of pulling out the pin, and as shown in FIGS. A hole having a height of about 5 mm having a substantially cylindrical side surface was formed.

  One side of a tube-shaped film made of an LLDPE film having a thickness of 50 to 150 μm was sealed to form a bag shape, and rice was accommodated and sealed. And by the method similar to Example 1, the hole which has a substantially cylindrical side surface was formed in the outer surface of a bag. Then, after the air in the bag was deaerated from this hole, the substantially cylindrical deaeration hole was laid down as shown in FIG. 8 and heated while further suppressing it from above, so that the walls of the deaeration hole were welded together. . Thereby, the deaeration hole was sealed and the bag was able to be sealed.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to each said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention.

1 Tip 2 Body 3 Return part

Claims (3)

A package characterized by forming a substantially cylindrical deaeration hole on the outer surface of the packaging bag by piercing the packaging bag with a pin having a substantially hemispherical tip and then pulling out the pin from the packaging bag. Method for forming bag deaeration holes. After piercing the packaging bag with a pin having a substantially hemispherical tip, the pin is pulled out of the packaging bag to form a substantially cylindrical deaeration hole on the outer surface of the packaging bag. A packaging bag sealing method, wherein the packaging bag is sealed by thermally welding pores. A deaeration hole forming pin used in the method for forming a deaeration hole of a packaging bag according to claim 1, wherein the pin has a substantially hemispherical tip and a substantially cylindrical shape continuously formed from the tip to the base side. And a return portion formed at a substantially central portion of the main body portion and formed so as to have a low resistance when piercing the film forming the packaging bag and a large resistance when pulled out from the film. A deaeration hole forming pin characterized by being made.