JP2009262974A - Rice packaging bag and method for manufacturing the rice packaging bag manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rice packaging bag wherein the bag for continuously filling rice every time a predetermined amount of rice is measured has a matt appearance at the surface of the bag without using any conventional adding agent, enables a rice filling port of the bag to be easily opened, has a heat seal heightened to increase its strength and to cause the bag to be hardly broken, and further enables air in the bag to be discharged positively and easily out of the bottom part in the bag body when the bag is sealed after being filled with the rice. <P>SOLUTION: The rice packaging bag 1 is formed by linear low-density polyethylene resin polymerized with metallocene catalyst where additive agents such as neutralizer, antioxidant, antiblocking agent, slip agent and antistatic agent are not used at all in polyethylene molten raw material, a plurality of maze seals 3<SB>1</SB>, 3<SB>2</SB>are melted and adhered near and along a direction of bottom side 3' of the formed bag to make a bottom part 30, and when the bottom part is to be formed, not-yet melted and adhered portions g<SB>1</SB>, g<SB>2</SB>, g of the vertical adjoining maze seals 3<SB>1</SB>, 3<SB>2</SB>are formed in a zig-zag shape to each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a bag for rice packaging, and a bag in which rice is continuously filled for each predetermined volume has a mat feeling on the surface of the bag without using an additive conventionally used. The rice filling port can be easily opened, the heat seal is increased to increase the strength, making it difficult to break the bag, and the air inside the bag can be reliably and easily deaerated from the bottom of the bag when sealed after filling. It is a thing.

  Generally, it is the most standard type of polyethylene used as food packaging material, high-pressure low-density polyethylene (LDPE = LD), medium-low pressure high-density used in shopping bags for shopping in supermarkets Polyethylene (HDPE = common name HD) and linear low density polyethylene (LLDPE = common name LLD) excellent in sealing performance and physical strength are known.

  Examples of additives and compounds used for polyethylene in the above food packaging materials include neutralizers (Ca stearate), antioxidants (phenolic and phosphorus), antiblocking agents (silica, zeolite) Polymer beads), slip agents (fatty acid amides), and antistatic agents (glycerin).

JP 2002-347784 A Japanese Utility Model Publication No. 59-75454 Japanese Patent No. 3215658

  In each of the above additives, the neutralizing agent has a neutralizing effect on the catalyst residue, the antioxidant has thermal stability during film processing, and the anti-blocking agent (AB agent) is a film packaging material. The slip agent can improve the opening of the film packaging material, and the antistatic agent has the effect of preventing scattering during powder packaging.

  In the past, high-pressure low-density polyethylene (LD) was a typical presence when polyethylene was referred to as “no additive”. However, the LD is weak in strength and easily broken, and has a low heat sealability and easily breaks the bag.

  The problems with each of the above-mentioned additives are that the neutralizer is transferred to the contents and the taste is transferred due to bleed (spout) of the additive, and the antioxidant is also transferred to the contents and the discoloration of the film. (Yellowing), and anti-blocking agents tend to cause odors and fill scratches derived from additives. Slip agents have odor generation and transfer to contents, and antistatic agents have transfer to contents.

  Therefore, the present invention relates to an improvement of a bag dedicated to rice packaging among food packaging materials. The first aspect of the present invention is a rice packaging bag, which is polymerized with a metallocene catalyst in which additives such as a neutralizing agent, an antioxidant, an antiblocking agent, a slipping agent, and an antistatic agent are not used at all in a polyethylene melt raw material. Forming a bag body for rice packaging with a linear low density polyethylene resin and providing a labyrinth seal in which a bottom portion of the bag body facing the bag body opening is formed with an unwelded portion with a slight interval along the bottom side It is a thing.

  The second aspect of the present invention is a rice packaging bag, which is polymerized with a metallocene catalyst in which additives such as a neutralizing agent, an antioxidant, an antiblocking agent, a slipping agent, and an antistatic agent are not used at all in a polyethylene melt raw material. Forming a bag body for rice packaging with a linear low density polyethylene resin and providing a labyrinth seal in which a bottom portion of the bag body facing the bag body opening is formed with an unwelded portion with a slight interval along the bottom side It is a thing.

  The third aspect of the present invention is a method for producing a rice packaging bag, which is polymerized with a metallocene catalyst in which additives such as a neutralizing agent, an antioxidant, an antiblocking agent, a slipping agent and an antistatic agent are not used at all in the polyethylene melt raw material. The formed linear low-density polyethylene resin is wound up with a winder while forming an ultra-long film tube body in the inflation process of a screw extruder to form a tube body raw material, and the tube body raw material is a gravure printing machine After printing on the surface of the original fabric in this printing process, it is wound up by a winder to make a printing original fabric, and the printing original fabric is sent to the bag making process of the bag making machine to form the bottom of the bag body from the original printing fabric At the position where the maze seal with a plurality of unwelded portions is formed by the seal bar along the bottom direction, the unwelded portions of the maze seals adjacent to each other are formed in a staggered manner. While providing the bottom part continuously at a predetermined distance, it is made to be wound up by a winder in an ultra-long state without being cut as a single bag body (= a single bag body) .

  The fourth aspect of the present invention is a method for producing a rice packaging bag, which is polymerized with a metallocene catalyst in which additives such as a neutralizing agent, an antioxidant, an antiblocking agent, a slipping agent and an antistatic agent are not used at all in the polyethylene melt raw material. The formed linear low density polyethylene resin is wound up with a winder while forming an ultra-long tube body in the inflation tube forming process of the inflation molding machine, and the tube body raw material is gravure printed. After printing on the surface of the original fabric in the printing process of the machine, it is wound up with a winder to make a printing original fabric, and the printing original fabric is fed out and sent to the bag making process of the bag making machine. At the position where the part is molded, a maze seal with a plurality of unwelded portions is formed by a seal bar along the bottom direction, and the unwelded portions of adjacent maze seals are bitten together. The bottomed part of the bag body that has been formed is continuously provided without being cut into individual bags at a predetermined distance, and wound on a winder in an extremely long state without being cut into individual bags as a bag body raw material. The bottom of the front bag body with the labyrinth seal is the position of the opening of the rear bag body through the rice filling process of the next rice filling machine, and a predetermined amount from the opening of the front bag body After the rice is filled, the opening is sealed and the outside of the labyrinth seal, which is the bottom of the front bag body, is cut with a cutter mechanism of the bag making machine into individual bags, the opening is opened and the rice is filled After that, the opening is sealed.

  Since the present invention has the above-described configuration, the following effects can be obtained. That is, the fact that no neutralizing agent is added to the polyethylene raw material in the configuration of the present invention means that the catalyst does not contain any halogen component (chlorine). Therefore, compared with polyethylene to which a neutralizing agent is added, there is no transfer to the contents due to bleeding of the additive. Moreover, there is no transfer of the odor and taste derived from an additive. Subsequently, discoloration of the film caused by the antioxidant is eliminated. Furthermore, according to the present invention, the present invention can also be applied to “Ministerial Ordinance for Milk” related to dairy product packaging.

  And according to the structure of this invention, since the anti-static agent is not added, the surface of the conventional polyethylene bag body is smooth, whereas it has a fine matte appearance as smooth. .

  In addition, the bag of the present invention has an effect that the film impact (1/2 inch) is about 3 times higher than that of a conventional additive-free polyethylene resin bag (for example, Novatec LD LF240) and is difficult to break the bag. There is. Furthermore, the heat seal temperature (at 5N) is about 118 ° C., which is lower than that of the conventional polyethylene bag of about 124 ° C., and a heat seal can be obtained.

Furthermore, for anti-blocking 50 ° C. (N / 10 cm ² ), a low blocking value of 5.2 or less than about 1/2 is obtained for 13.6 of the conventional polyethylene bag.

  In addition, according to the present invention, air that has entered together during rice filling passes through the unwelded portions of the plurality of maze seals at the bottom of the bag body and is deaerated to the outside of the bag body. At this time, the rice grains in the bag are prevented from spilling out of the bag because the unwelded portions of the adjacent labyrinth seals are formed in a staggered manner.

  The best mode of the rice packaging bag according to the present invention is as follows. That is, a linear low density polyethylene resin polymerized with a metallocene catalyst in which no additive such as a neutralizing agent, an antioxidant, an antiblocking agent, a slipping agent, and an antistatic agent is used in a polyethylene melt raw material is an inflation molding machine. After forming an ultra-long and cylindrical film tube body in the inflation film forming step, the tube body is wound up with a winder while being flattened.

  The tube body raw material is subjected to printing necessary on the surface of the tube body raw material in the printing process of the gravure printing machine, and then wound up with a winder to form a printing tube body raw material, and the printing tube raw material is used as a bag making machine. In the bag making process, at the position where the bottom of the bag body is formed from the printing tube body, a maze seal with a plurality of unwelded portions is formed by a heat-welding seal bar along the bottom direction.

  Along with the labyrinth seal, the unsealed portions of the labyrinth seals that are adjacent to each other are formed continuously with a predetermined distance, and a winder without cutting into individual bags as a bag body Let it wind up.

  Then, the position of the bottom portion with the labyrinth seal of the front bag body is set as the position of the opening of the rear bag body through the rice filling process of the next rice filling machine, and a predetermined amount from the front bag body opening portion. After the rice is filled, the opening is sealed, and the outside of the labyrinth seal, which is the bottom of the front bag body, is cut with a cutter mechanism of the bag making machine into individual bags, the opening is opened and the rice is filled Sealing the opening completes the rice packaging process.

Next, embodiments of the present invention will be described with reference to the drawings. 1 is a film made of a linear low-density polyethylene resin polymerized with a metallocene catalyst that does not use any additives such as neutralizers, antioxidants, antiblocking agents, slip agents, antistatic agents, etc. 2 is an opening portion of the bag body 3, 3 is a bottomed portion of the bag body, and a plurality of degassing labyrinth seals 3 ₁ and 3 ₂ are formed by thermal welding along the bottom side 3 ′. In addition, the unwelded portions g ₁ , g ₂ , and g of the maze seals 3 ₁ and 3 ₂ adjacent to each other in the vertical direction are formed so as to stagger each other. One of the unwelded portions of the labyrinth seal is a short welding line having a lateral width of about 2 mm and a length of about 5 mm and a long welding line of about 20 mm at an interval of about 5 mm. The other is a long welding line having a width of about 2 mm and a length of about 44 mm at an interval of about 17 mm. 4 is a horizontally-long rectangular black printed display directly on the left and right sides at a predetermined distance L ₂ (about 10 mm) immediately above the bottom 3 of the bag body. In the automatic rice filling machine D, the cutting position and the sealing position of the bag body It becomes a mark that is detected by the sensor.

"Specific work process"
(1) Manufacture of the tube body The linear low polymer polymerized with a metallocene catalyst that does not use any additives such as neutralizers, antioxidants, antiblocking agents, slip agents, antistatic agents, etc. The density polyethylene resin is wound up by a winder A "while forming an ultra-long film tube body in the inflation molding process of the screw extruder A to obtain a tube body 1a.
(2) Production of Gravure Printing Material After the tube material is printed on the surface of the tube material in the printing process of the gravure printing machine B, the tube material is wound up by a winder B ″ to be a printing material 1b.
(3) Production of the bag body fabric At the position where the printing tube body fabric 1b hung on the feeding machine C 'is fed out and sent to the bag making process of the bag making machine C, and the bottom of the bag body is formed from the printing fabric 1b. , together forming a non-welded portion with labyrinth seal 3 ₁ - 3 ₂ of plural rows by seal bar C ₁ along the bottom direction, the unwelded portion g ₁ · g ₂ of the adjacent labyrinth seal 3 ₁ - 3 ₂ The bottomed portion 3 of the bag body 1 formed in a staggered manner is continuously wound at a predetermined distance L while being wound around the winder C "as a bag body fabric 1c. In this bag making process, the bag making process is performed. The cutter mechanism C ₂ for processing the tube body original fabric provided in the machine C into the individual bag 1 is configured not to operate.
(4) in the United filling process of fabrication US automatic filling machine D rice filling bag, the bag raw single bag is cut by a cutter D _1, i.e. the number bag 1, the opening of the individual bags The part 2 is opened with the opening bar D ₃ , and in this state, the individual bag is moved to the rice supply part Dn and stopped, and after filling a predetermined amount of rice r from the rice supply part Dn into the individual bag, the opening part 2 is closed. After closing the opening at D ₄ , the rice packaging process is completed once in a single bag by sealing and removing with the seal bar D ₆ .

  In addition to rice packaging, the present invention can also be applied to other cereals subjected to automatic filling machines such as wheat, beans, and other granular packaging bags.

It is a front view of the bag for rice packaging concerning the present invention. It is a front view which shows a part of tube body raw fabric for the rice packaging bags of FIG. It is a schematic front view of the inflation film forming machine provided with the extruder used for the inflation shaping | molding process for making the rice packaging bag of FIG. It is a schematic explanatory drawing of the gravure printing apparatus used for a gravure printing process. It is a schematic front view of the bag making machine used for a bag making process. It is a schematic perspective view of a rice automatic filling machine.

Explanation of symbols

1 ... Single bag (= individual bag)
2 …… Opening 3 …… Bottom 3 ′ …… Bottom of bag 3 ₁・ 3 ₂ …… Maze seal A …… Inflation film forming machine B …… Gravure printing machine C …… Bag making machine D …… Rice Automatic filling machine g ・ g ₁・ g ₂ …… Unwelded part

Claims (4)

Bags for rice packaging with linear low-density polyethylene resin polymerized with metallocene catalyst that does not use any additives such as neutralizing agent, antioxidant, anti-blocking agent, slip agent, antistatic agent, etc. in polyethylene melt raw material (1) forming a labyrinth seal (3 along the bottom direction to form a non-welded portion unwelded portion (g ₁ · g ₂₎ having a slight spacing in the vicinity of the molded bag bottom (3 ') ₁ ) A packaging bag for rice, characterized in that Bags for rice packaging with linear low-density polyethylene resin polymerized with metallocene catalyst that does not use any additives such as neutralizing agent, antioxidant, anti-blocking agent, slip agent, antistatic agent, etc. in polyethylene melt raw material (1) molding and the molded bag bottom (3 ') the base direction by welding a plurality condition along labyrinth seal (3 _1, 3 ₂₎ having a bottom portion by molding in the vicinity of the (3) Rice packaging characterized by forming unwelded portions (g ₁ · g ₂ , g) of the maze seals (3 ₁ · 3 ₂ ) vertically adjacent to each other when forming the bottomed portion Bags. Screw extruder (A) A linear low-density polyethylene resin polymerized with a metallocene catalyst that does not use any additives such as neutralizers, antioxidants, antiblocking agents, slip agents, and antistatic agents. ) In the inflation process, an ultra-long film tube body is formed and wound by a winder (A ") to form a tube body original fabric (1a), and the tube body original fabric is printed by a gravure printing machine (B). After printing on the surface of the original fabric in the process, it is wound up by a winder (B ") to form a printing original fabric (1b), and the printing original fabric is sent to the bag making process of the bag making machine (C). At the position where the bottom side of the bag body is formed from the opposite side (1b), the maze seals (3 ₁ ) and (3 ₂ ) with a plurality of unwelded portions are molded by the seal bar (C ₁ ) along the bottom direction. stagger unwelded portion of the labyrinth seal adjacent the upper and lower (3 _1, 3 ₂₎ (g ₁ · g ₂ · g) together The rice packaging bag is characterized in that the bottomed portion (3) formed on the bag is continuously wound at a predetermined distance (L) while being wound around a winder (C ") as a bag body fabric (1c). Production method. Inflation molding machine (A) A linear low-density polyethylene resin polymerized with a metallocene catalyst that does not use any additives such as neutralizers, antioxidants, anti-blocking agents, slip agents, and antistatic agents. ) Inflation tube forming process of forming an ultra-long tube body (1a) with a winder (A ") to make a tube body original fabric (1a), and the tube body original fabric is a gravure printing machine ( After printing on the surface of the original fabric in the printing process of B), it is wound up by a winder (B1) to form a printing original fabric (1b), and the printing original fabric is fed out to make a bag making process of the bag making machine (C) The labyrinth seals (3 ₁ ), (3 ₂ ) with a plurality of unwelded portions by the seal bar (C ₁ ) along the bottom direction at the position where the bottom of the bag body is formed from the printing original fabric (1b). ) as well as molded, unwelded portions of adjacent labyrinth sealing _{(3 1) · (3 2} ) (g 1 · g 2 · g The bottomed portion (3) of the bag body (1) formed in a staggered manner is continuously wound at a predetermined distance (L) and wound around the winder (C ") as a bag body fabric (1c). The position of the bottom portion (3) with the labyrinth seal of the front bag body (1) through the rice filling process (D) of the rice filling machine of the next process is set as the position of the opening (2) of the rear bag body, The opening is sealed after filling a predetermined amount of rice from the front bag body opening (2), and the labyrinth seals (3 ₁ ), (3 ₂ ) which become the bottomed part (3) of the front bag body ) Cut the bottom (3 ') outside the bag with the cutter mechanism (D ₂ ) of the bag making machine (D) to make a single bag (1), open the opening (2) and fill with rice. A method for producing a rice packaging bag, wherein