JP2012240740A - Bag by zipper for hot water treatment, and package using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag by zipper for hot water treatment, which has satisfactory storage properties with excellent oxygen barrier properties and steam barrier properties, can be subjected to hot water treatment such as boiling, retort treatment or steam sterilization, and can be easily fitted again even when it is opened in use.SOLUTION: The bag by zipper 1 for hot water treatment uses a laminated film composed of a transparent vapor-deposited film having a metal oxide vapor-deposited thereon and a heat sealing film, and includes a zipper 2 having a zipper tape base 11 and an openable and closable fitting portion 9, which is held by horizontal heat seal portions 6 on both sides by heat sealing. Both ends of the zipper 11 are conformed to the ends of the horizontal heat seal portions 6, and a point seal 4 is performed except the vicinity of the ends of the horizontal heat seal portions 6 on both ends which hold the zipper 2 to crush and heat-seal the fitting portion 9.

Description

  The present invention relates to a zippered bag for hot water treatment, and more specifically, for hot water treatment comprising a laminated film in which a metal oxide vapor deposited film that can be subjected to hot water treatment after storing food, pharmaceuticals, and the like is laminated. The present invention relates to a bag body with a zipper and a package body using the same.

  In the present specification, “ratio”, “part”, “%” and the like indicating the composition are based on mass unless otherwise specified, and the “/” mark indicates that they are integrally laminated. “PET” is an abbreviation, functional expression, common name, or industry term for “polyethylene terephthalate”, “PA” for “polyamide”, “PP” for “polypropylene”, and “PE” for “polyethylene”.

(Background Art) Conventionally, a deposited film in which a deposited layer of metal oxide is formed on a film is referred to as a transparent deposited film, and has excellent oxygen barrier properties and water vapor barrier properties. For this reason, since the content can be visually recognized in the bag body formed from the laminated film which laminated | stacked the heat-sealable film etc. on this transparent vapor deposition film, it is widely used for the barrier bag body which packages a foodstuff or a pharmaceutical. A bag body with a zipper with a fitting part that can be opened and closed on the inner surface in the vicinity of the opening of the bag formed from a laminated film laminated with an inner surface heat-sealable film can be easily re-fitted even if the bag is opened during use. Since it can, many are in circulation. The fitting part generally has a convex part with an arrow tip in section and a concave part with a C-shaped cross section, but there is a gap in the fitting part and the liquid enters the gap. Not liquid-tight. For this reason, it is mostly used for packaging solid foods such as sprinkles and solids such as machine parts, and the contents containing liquid packed in a bag with zipper are those with little liquid such as salty salt, menma, There was a drawback that it was limited to those with high viscosity.
Therefore, a bag body made of a laminated film laminated with a transparent vapor-deposited film and having a zipper having a fitting part that can be opened and closed in the vicinity of the opening part has excellent oxygen barrier properties and water vapor barrier properties, and Since the bag can be easily re-fitted even if it is opened at the time of use, it is convenient. However, since the metal oxide vapor deposition layer of the transparent vapor deposition film is thin and hard, in particular, a zipper is attached to the bag body on which the transparent vapor deposition film is laminated, and a seal is applied to the bag body to provide a point seal, When the zipper with a three-dimensional structure is flattened flat at high temperature and pressure, the base film becomes soft and stretches. However, it cannot be judged from the appearance. Such a state is not a problem as long as the contents are solids or the like and are not subjected to hot water treatment, but in the case of a package subjected to hot water treatment such as boiling, retort, steam sterilization, From the cracked or partially peeled portion of the metal oxide vapor deposition layer at the end surface of the metal oxide vapor deposition layer where the zipper cut end is located, hot water penetrates into the adhesion surface or the adhesion surface of the metal oxide vapor deposition layer, Furthermore, the shrinkage of the base film of the transparent vapor-deposited film by heating and the film laminated on the metal oxide vapor-deposited layer side occurs, and the metal oxide vapor-deposited layer laminated surface at the site where the zipper cut end is located peels off. The barrier property of the package is lowered at the site, and the package is forced to be discarded. In addition, defective products with the metal oxide vapor deposition layer laminate surface completely peeled can be discarded after visual inspection after hot water treatment. Zipper with a transparent vapor deposition film laminated, where peeling cannot be easily judged from the appearance, and after the product has circulated for some time, there may be an accident that reveals the outflow of defective products due to oxidative deterioration of the contents, etc. The hot water treatment product with a bag has a big problem.
Therefore, the zippered bag for hot water treatment has excellent oxygen barrier property and water vapor barrier property and good storage stability, can be treated with hot water such as boil, retort, steam sterilization, etc. It is required to be able to re-fit.

Japanese Patent Laid-Open No. 11-285518 JP 2006-182408 A Japanese Patent Laid-Open No. 7-246670 JP 2005-1683 A

(Prior Art) Conventionally, the interior space of a bag body is partitioned fluidly up and down by an easily peelable partition wall provided close to the zipper, and liquid is stored in the space below the partition. A device for a liquid storage bag is known (for example, see Patent Document 1). However, there is a drawback of lacking oxygen barrier properties.
In addition, a bag body in which the contents storage side and the unsealing side of the bag body are liquid-tightly blocked using a zipper having a V-shaped cross section is known to be distributed in large quantities for liquid packaging bags (for example, , See Patent Document 2). However, there is a problem that hot water treatment such as retort sterilization cannot be performed in the subchamber where no moisture is present.
Furthermore, regardless of the shape of the zipper, the bag body cannot be sealed unless the gap between the fitting parts is closed by the heat seal part at the peripheral edge part of the bag body, but the thickness of the zipper is a film constituting the bag body Since it is very thick compared to, it can not be sealed by normal heat seal, so the bag making machine heat seals by applying high pressure only to the part where the bag body peripheral heat seal part and zipper intersect, which is called point seal Thus, a means for crushing the fitting portion and sealing the bag body is used. As a zipper point seal method, there is known a device for improving the hermeticity of both ends of a zipper fitting portion in a bag that is easily deformed at the time of point seal (see, for example, Patent Document 3). However, since the metal oxide vapor deposition layer of the transparent vapor deposition film is thin and hard, when the zipper is attached to the bag body laminated with the transparent vapor deposition film and flattened at a high temperature and high pressure of the point seal, the film softens and stretches. The metal oxide vapor-deposited layer, which is difficult to stretch, is cracked and has a problem of partial peeling or loss of barrier properties.
Furthermore, it is known that a notch is formed in an unsealed portion provided in a part of the bag body peripheral heat seal portion to prevent the skin from being damaged at the corner of the notch (see, for example, Patent Document 4). . However, there is a problem that it cannot be easily re-fitted even if it is opened at the time of use.

  In order to solve the above-described problems, the present inventors have made extensive studies and have completed the present invention. Its purpose is excellent oxygen barrier property and water vapor barrier property, good preservation, hot water treatment such as boil, retort, steam sterilization, etc. and can be easily re-fitted even when opened in use It is to provide a bag body with a zipper for hot water treatment.

In order to solve the above problems, a zippered bag for hot water treatment according to the invention of claim 1 of the present invention is a laminate composed of at least a transparent vapor-deposited film on which a metal oxide is vapor-deposited and a heat sealable film. Using the film, the heat-sealable film surfaces of the laminated film are opposed to each other to form a horizontal heat seal part on both sides and an upper heat seal part on the upper side by heat sealing, and a zipper is formed on the horizontal heat seal part on both sides. A zipper having a fitting portion that can be freely opened and closed is sandwiched by heat sealing, and the zipper tape base forms a zipper heat sealing portion by the heat sealing film surface and heat sealing of the opposed laminated film, and the zipper A zippered bag for hot water treatment, the inside of which is partitioned by a freely openable / closable fitting portion, The end part of the zipper and the end part of the horizontal part heat seal part coincide with each other, and the fitting part is crushed except for the vicinity of the end part of the horizontal part heat seal part sandwiching the zipper and heat seal It is a bag body with a zipper for hot water treatment characterized by giving a point seal to do.
The zippered bag for hot water treatment according to the invention of claim 2 is a self-standing bag formed by heat-sealing with a seal pattern in a shape that provides the self-supporting property at the bottom with the upper heat seal portion as an opening. It is a bag body with a zipper for hot water treatment of Claim 1 characterized by the above-mentioned.
The bag body with a zipper for hot water treatment according to the invention of claim 3 is provided between the upper heat seal portion and the zipper, or the upper heat seal scheduled portion and the zipper that become the upper heat seal portion after filling the contents. The zipper bag for hot water treatment according to any one of claims 1 to 2, wherein a notch for opening is provided on at least one side of the horizontal heat seal part between the two. .
A package with a hot water treatment zipper according to the invention of claim 4 is filled with the contents of the bag with a zipper for hot water treatment according to any one of claims 1 to 3, and is heat-treated with water or steam. It is a package with a hot-water treatment zipper characterized by comprising.

  The laminated film of the bag body with a zipper for hot water treatment of the present invention is a point for crushing and heat-sealing the fitting portion except for the vicinity of the end portions of the lateral heat seal portions on both sides of the peripheral heat seal portion of the bag body. Sealed. That is, since the point seal for zipper is not provided near the end of the horizontal heat seal part, excessive stress is not given to the end of the transparent vapor deposition film of the zipper mounting part, and therefore during hot water treatment The peeling accident caused by the point seal can be prevented. Therefore, according to the present invention of claims 1 and 2, long-term storage is good by hot water treatment such as boiling, retort, steam sterilization, and nutrition and flavor are maintained by excellent oxygen barrier property and steam barrier property. Also has the effect. According to the third aspect of the present invention, in addition to the effect of the first aspect, there is an effect that it can be easily opened at the time of use and can be re-fitted.

It is a top view of the bag body with a zipper for hot-water treatment which shows one Example of this invention. It is sectional drawing which shows an example of the zipper fitting part of FIG. It is explanatory drawing which shows the bag making process of the bag body with a zipper of this invention. It is a top view of the principal part of the point seal | sticker part before the cutting | disconnection in the bag making process of FIG. It is a top view of the principal part of the point seal | sticker part of the bag body with a zipper of this invention. It is a top view of the principal part of the point seal | sticker part before the cutting | disconnection in the bag making process of the conventional bag body with a zipper. It is a top view of the bag body with a zipper for hot-water treatment which shows one Example of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in this specification, the zipper side of a bag body with a zipper for hot water treatment is called an upper part, and the opposite side is called a bottom part.

  (Hot water treatment zippered bag) The hot water treatment zippered bag 1 of the present invention comprises, as shown in FIG. 1, at least a transparent vapor-deposited film on which a metal oxide is vapor-deposited and a heat-sealable film. Using the laminated film, the heat-sealable film surfaces of the laminated film are opposed to each other to form the horizontal heat seal part 6 on both sides and the upper heat seal part 5 on the upper side by heat sealing, A zipper having a zipper tape base 11 and a fitting part 9 that can be freely opened and closed is sandwiched between the heat seal parts 6 by heat sealing, and the zipper tape base 11 is zipper heat sealed by heat sealing film surfaces and heat seals of the opposed laminated films. A zipper for hot water treatment that forms a portion 8 and is partitioned by a fitting portion 9 that can freely open and close the zipper 2 It is a bag body 1, Comprising: The edge part of the said zipper 2 of both sides and the edge part of the said horizontal part heat seal part 6 correspond, respectively, The edge part vicinity of the horizontal part heat seal part 6 of both sides which pinches | interposes the said zipper There is a point seal portion 4 that is a point seal that crushes the fitting portion 9 and heat seals.

  As shown in FIG. 6, the conventional bag body with a zipper is a bag body that has been heat-sealed at the peripheral edge portion excluding the opening, but the zipper is sandwiched between the lateral heat-sealing portions on both sides. A point seal for crushing the fitting portion 9 and heat-sealing is applied to the entire surface of the horizontal heat seal portion 6. On the other hand, in the bag body 1 with a zipper for hot water treatment of the present invention, the point seal portion 4 is formed except for the vicinity of the end portions of the lateral heat seal portions 6 on both sides sandwiching the zipper 2.

  (Self-standing bag body) In general, since the zipper 2 is made in a closed state, the opening of the bag body is often the bottom heat seal portion. However, as shown in FIG. 7, the upper heat seal portion 5 may be an opening, and the bottom may be heat sealed to form a self-supporting bag. A self-supporting bag may be heat-sealed with a seal pattern in a shape that provides independence to the bottom, and the bottom is folded back and inserted between the lower parts of the front and back laminated films, and the periphery is heated. A sealed gusset type or a type having a ship bottom type, a so-called bottom type called a gusset or stand pack by those skilled in the art.

  In the case of a self-standing bag, if it is difficult to heat seal the bottom with a packaging machine that fills the contents, the bag is made with the zipper closed, and then the zipper is opened on the bag making machine. Alternatively, the contents may be filled from the zipper attachment side of the bag body by opening the zipper with human hands or opening the zipper with a packaging machine. What is necessary is just to heat-seal and seal an upper heat seal part after filling the contents.

  In addition, when gas sterilization or steam sterilization is performed on a bag with a zipper, sterilization is performed with the zipper open in order to ensure sterilization in the vicinity of the zipper, but γ-ray sterilization or electron beam sterilization is recommended. When applied, the zipper may be closed. Also in the case of the bag body with a zipper which concerns on this invention, you may manufacture in the state which the zipper opened according to a use.

  (Notch) In the hot water treatment zipper-equipped bag body 1 of the present invention, a notch is formed on the outer side of the horizontal heat seal portion 6 between the zipper 2 and the upper heat seal portion 5, and the bag body can be easily formed by hand. May be opened. Further, in the self-standing bag-shaped zipper for hot water treatment 1 shown in FIG. 7, the lateral heat seal between the upper heat seal scheduled portion that becomes the upper heat seal portion 5 after filling the contents and the zipper 2. An opening notch may be provided on at least one side of the portion 6, and the bag can be easily opened by hand.

  (Zipper) FIG. 2 is a schematic sectional view showing an example of the zipper fitting portion 9, in which an arrow-shaped convex portion and a concave portion having a C-shaped cross section are fitted. In general, the fitting portion 9 of the zipper has a weak opening strength from the opening side by devising the shape of the convex portion and the concave portion, and the opening strength from the contents side is strong, which is easy for the user to open, and When the zipper is opened by the pressure from the contents side during distribution, the contents are prevented from entering the fitting portion 9 to make it difficult for the user to reseal. There are various types of convex and concave shapes, such as a convex hemispherical shape that improves sealing performance, and the arrow tip is hooked on only one side. Also, referred to as a W zipper, in which the fitting portions 9 are arranged in two rows in order to further improve the sealing performance, the zipper tape base 11 on the opening side is closed to have a V-shaped cross section, the zipper tape base 11 on one side By laminating a weak heat-sealable resin on the surface of the portion where the width of the bag is extended to the content side, and providing a heat seal surface and a weak heat seal portion on the inner surface of the bag body, the content does not enter the fitting portion 9 Zippers that have been devised in various ways, such as those made, have been put into practical use, and any zipper used in the zipper-equipped bag body of the present invention can be applied as long as it is made of a thermoplastic resin.

  (Laminated film) The laminated film constituting the zippered bag body 1 of the present invention is composed of a laminated film obtained by laminating at least a transparent vapor-deposited film on which a metal oxide vapor-deposited layer is formed and a heat-sealable film. Accordingly, a reinforcing layer, a barrier layer or the like can be provided on the surface of the laminated film or an intermediate layer. As a film in which a vapor-deposited layer of metal oxide is formed, a biaxially stretched polyethylene terephthalate film in which a vapor-deposited layer of metal oxide such as silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide is formed, A biaxially stretched polyamide film, a biaxially stretched polypropylene film, or the like can be used. In particular, a biaxially stretched film in which a vapor-deposited layer of silicon oxide or aluminum oxide is formed is preferably used in terms of availability. be able to. If necessary, these metal oxide vapor-deposited films can be coated with various coatings to improve adhesion, barrier properties, physical strength, etc. on the vapor-deposited surface, or subjected to corona discharge treatment or plasma treatment on the non-deposited surface. Or an easy-adhesive resin, a barrier resin, or the like can be applied.

  (Heat-sealable film) Any heat-sealable film may be used as long as it can be softened or melted by heat and fused to each other. For example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (wires) ) Low density polyethylene, polypropylene, cyclic polyolefin, ethylene-cyclic olefin copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic A resin composed of one or more resins such as an acid copolymer and an ethylene-propylene copolymer, or a sheet obtained by forming a film of these resins can be used, and a thickness of 20 to 200 μm is appropriate.

  As a method of laminating these films, a plurality of layers may be extruded to be co-extruded laminated, a thermo-adhesive resin may be laminated by a T-die extrusion lamination method, or a two-component curable type It may be laminated by a dry laminating method using a urethane adhesive. In the case of the T-die extrusion lamination method, an anchor coating agent can be used as necessary. In particular, when the contents need to be retort sterilized, it is desirable to laminate by the dry laminating method using the above-mentioned two-component curable urethane adhesive. Further, as a deformation means of the T-die extrusion lamination method, a thermal lamination method may be used, and heat-sealing films may be laminated by heat sealing.

  (Bag-making) The bag body 1 with a zipper of the present invention may be the same as the conventional bag-making method of a bag body with a zipper as shown in FIG. 3, and the bag-making process will be described. First, the zipper 2 is continuously supplied between the heat seal surfaces of the laminated film constituting the bag body that is continuously supplied by facing the heat seal surfaces of the laminated film and overlapping them, After fixing the zipper tape base 11 with the zipper heat seal part 8 by the zipper seal on the heat seal surface, the part of the zipper 2 located in the horizontal heat seal part 6 is crushed and then the heat seal is called a side seal. The part heat seal part 6 is applied. Manufactured by providing notches 3 holes and cuts as necessary, cutting off excess portions and then cutting each bag. Although not specifically shown, two rows can be made simultaneously.

  (Point seal) The point seal prevents the omission of the seal from the fitting portion 9 by crushing the fitting portion 9 of the zipper 2 located in the horizontal heat sealing portion 6 by applying heat and pressure to form a plate shape. It is applied for sealing. In a hot plate type point seal, it is common to seal at the same location twice with the same shape, but depending on the case, it may be sealed three times or once. For the peripheral heat seal part, a film is sandwiched between the heat plate and the receiving rubber plate, and heat sealing is generally performed twice from the upper side and the lower side of the film. Since the sealing pressure is insufficient, the film is sandwiched by heat plates having the same shape from the top and bottom of the film and heat sealed. Further, point sealing may be performed with an ultrasonic sealing device, and ultrasonic sealing type point sealing may be performed only once. When crushing the zipper by the point seal is insufficient, not only will the seal be removed from the fitting part, but the thickness of the zipper located in the horizontal heat seal part will become thick, and when performing horizontal heat seal, a laminated film Since the seal pressure at the boundary between the zipper and the seal may be lost, the point seal needs to be performed by applying a considerably higher pressure and temperature than the other seal portions of the bag.

  (Shape of point seal) In the bag body with zipper 1 of the present invention, the point seal shape is different, and the fitting portion 9 is crushed except for the vicinity of the end portions of the lateral heat seal portions 6 on both sides sandwiching the zipper 2. A point seal portion 4 to be heat sealed is formed. In the conventional bag making process of a bag body with a zipper, as shown in FIG. 6, sealing is performed over the entire surface of two adjacent lateral heat seal portions 6, but in the bag body 1 with a zipper of the present invention, as shown in FIGS. In this way, the point seal shape is not a simple rectangle, but a chamfered tooth, such that two small rectangles are arranged at intervals between two adjacent bags so that the end of the horizontal heat seal part 6 Do not apply point seals only near the area.

  In addition, since the point seal unexecuted portion of the horizontal heat seal portion 6 does not crush the zipper, only that portion has a large thickness, and when the normal heat seal surface is applied to the horizontal heat seal portion 6 with a flat seal bar, A high seal pressure is applied only to the point seal non-executed portion, the pressure of the other horizontal heat seal portion 6 is insufficient, not only causing foaming of the heat seal resin and a decrease in heat seal strength, but also metal oxide. It also damages the deposited layer. Accordingly, in the present invention, the portion of the horizontal seal bar that corresponds to the point seal non-executed portion is shaved so that the horizontal heat seal portion 6 is not simultaneously applied to the point seal non-executed portion.

  If the length of the point seal unsealed portion 10, that is, the interval of the clog tooth heat seal, is too narrow, it is difficult to register the final cutting position in the bag making process, and if it is too wide, the heat of the portion where the zipper is crushed The seal width becomes narrow, leading to insufficient strength. For this reason, it is 2 mm or more, preferably 3 to 5 mm in a state in which the two bags before cutting are connected, and is less than or equal to half of the width of the horizontal heat seal part 6 at the place where the zipper 2 is attached. Is desirable. In addition, the size of the horizontal seal bar that cuts the portion corresponding to the point seal non-executed portion may be equal to or larger than the zipper size of the point seal non-executed portion. It is preferable to provide a clearance of about 1 to 10 mm, preferably 1 to 3 mm, on the entire outer periphery, because the lateral heat seal position may be slightly deviated and bag making becomes easy.

  As described above, the shape of the bag body 1 with a zipper of the present invention is a four-side sealed bag, a stand pack, a bottom, which is manufactured through a process of making a bag while continuously supplying the zipper 2 to a continuous laminated film. Applicable to pre-fabricated bags such as gusset bags. Moreover, in the longitudinal bag-making product which needs to supply the zipper cut | disconnected by the fixed dimension, by trimming the periphery heat seal part of the location which crushed the zipper 2 at the time of bag making, it becomes a cutting part of a periphery heat seal part. This can be applied when the cut end of the crushed zipper is exposed.

  FIG. 4 is a schematic view of the point seal portion 4 before the bag body 1 with a zipper of the present invention is cut for each bag. (In the actual bag making process, the horizontal heat seal portion 6 is the foremost surface in the traveling direction, but the point seal portion 4 is shown on the foreground for ease of explanation. The same applies hereinafter.) As shown in FIG. The point seal of the zippered bag body 1 of the present invention is not applied to the cutting position where the horizontal heat seal portion 6 is cut and becomes the end portion. Moreover, since the zipper 2 which is not crushed exists at the edge part of the horizontal part heat seal part 6, if the whole surface of the part in which a zipper exists is heat-sealed like normal horizontal heat seal, it will be crushed The zipper part of the horizontal seal bar is not crushed because the part of the zipper that has not been subjected to the pressure of the seal, the seal pressure of the peripheral part is insufficient, causing seal omission and foaming of the heat sealable film It is necessary to cut the part that hits the part, and the part where the seal bar is cut does not come into contact with the laminated film and becomes unsealed. There is a need. As for the cooling bar after heat sealing, it is better to cut the part that hits the part where the zipper is not crushed, but the normal cooling bar is a method of passing cooling water through the aluminum block, by using a wider one Since it is a common part and replacement is complicated, if the projection of the zipper unsealed part adversely affects the cooling process, thicken the rubber plate of the receiver or lower the hardness of the rubber plate of the receiver to soften the rubber It is good to respond by using.

  FIG. 5 is an enlarged view of a main part of the point seal portion 4 of the bag body 1 with a zipper according to the present invention. As described above, the high temperature and high pressure of the point seal are not applied to the end of the zipper 2 of the horizontal heat seal portion 6 that becomes one bag. Therefore, in the horizontal heat seal part 6 of the bag body 1 with a zipper of the present invention, there is very little peeling of the metal oxide deposited layer that cannot be judged from the appearance. Moreover, it is made for the edge part of the said zipper of both sides and the edge part of the horizontal part heat seal part 6 of the said bag body to correspond.

  With a hot water treatment zipper obtained by applying heat treatment such as boiling, retort, steam sterilization, etc., using water or steam as a heat medium, to a package filled with the contents of the bag with zipper 1 of the present invention In the package, film peeling from the metal oxide deposition surface hardly occurs. In addition, the possibility that the contents are oxidized and deteriorated without knowing in the middle of distribution, in stock, or in stores is very low.

  (Film) Such a feature is that, in the laminated film used in the zippered bag 1 of the present invention, as a base film of a transparent vapor-deposited film in which a metal oxide vapor-deposited layer is formed, a biaxially stretched polyamide film, a biaxially stretched polypropylene When a film that easily heat shrinks such as a film is used, and a film that easily heat shrinks, such as a biaxially stretched polyamide film or a biaxially stretched polypropylene film, or an unstretched polyamide A remarkable effect is obtained when a film that is easily thermally deformed, such as a film or a heat sealable film, is bonded.

  Moreover, if the width in the length direction of the horizontal heat seal portion 6 of the point seal unsealed portion 10 is too wide, the width of the horizontal heat seal unsealed portion 10 also becomes wide, and the horizontal heat seal unsealed portion during hot water treatment It is difficult for the water that has entered 10 to escape, and depending on the type of pinhole inspection device, such as voltage application method, even if there is no pinhole, it is detected as being present, or in the worst case, microorganisms propagate in the remaining water. There is a possibility that. However, if the width of the point seal unsealed portion 10 is too narrow, the allowable range of the cutting position in the bag making machine becomes narrow, so the width of the point seal unsealed portion 10 is adjacent to each other before cutting. In the state, about 1 to 15 mm, preferably 2 to 10 mm (1 mm to 5 mm on one side) is preferable. However, depending on the width of the lateral heat seal portion 6 of the bag body, it is necessary to keep the upper limit low. In this case, it is preferably less than half the width of the lateral heat seal portion 6 of the bag body.

  Further, the width of the horizontal heat seal portion 6 needs to be wider than the width of the point seal unsealed portion 10 in both the vertical direction and the horizontal direction. In the bag making machine, it is difficult to register the horizontal heat seal portion 6 with respect to the point seal unsealed portion 10, which is not preferable. However, even if it is too wide, the above-mentioned problem of remaining water occurs. Therefore, it is preferable that the point seal is unsealed at 1 mm to 3 mm in both the vertical and horizontal directions.

  (Conventional) FIG. 6 is a plan view of a main part of a point seal portion before cutting in a bag making process of a conventional bag body with a zipper. In such a zippered bag with the whole surface point-sealed, the metal oxide vapor-deposited layer of the transparent vapor-deposited film that is unique to the laminated film is thin and hard. When the film as a base material is softened and stretched by being crushed, the metal oxide vapor-deposited layer, which is difficult to stretch, is cracked or partially peeled off. However, since cracks and peeling are transparent, they cannot be judged from the appearance. In this state, when hot water treatment such as retort or steam sterilization is performed, hot water penetrates from the cracked or partially peeled portion of the metal oxide vapor-deposited layer, and the film shrinks due to heating, resulting in lamination. The surface is peeled off or the barrier property is lowered. However, it cannot be easily judged from the appearance, and it contains major problems such as an outflow accident of defective products after the product is distributed.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, it is not limited to this.

(Manufacture of laminated film) First, laminated films A to D are produced.
(Laminated film A) As a metal oxide vapor-deposited film, a silicon oxide vapor-deposited biaxially stretched PET film (product name “IB-PET-RB”, manufactured by Dai Nippon Printing Co., Ltd.) having a thickness of 12 μm and a width of 760 mm is selected, and gravure printing is performed. The design and the characters were printed on the coating surface of the vapor deposition surface with a machine. A two-component curable urethane-based adhesive is applied to the printed surface of the printed silicon oxide-deposited biaxially stretched PET film, and a biaxially stretched PA film (product name “Bonyl W”, Kojin) with a thickness of 15 μm and a width of 760 mm is applied. After bonding, a two-component curable urethane adhesive is applied to the surface of the PA film, and an unstretched PP film (product name “P1147”) having a thickness of 60 μm and a width of 760 mm is used as a heat sealable film. , Manufactured by Toyobo Co., Ltd.) and slit to a width of 370 mm to obtain a laminated film A.

  (Laminated film B) As a metal oxide vapor-deposited film, a silicon oxide vapor-deposited biaxially stretched PET film (product name “IB-PET-RB”, manufactured by Dai Nippon Printing Co., Ltd.) having a thickness of 12 μm and a width of 760 mm is selected. The pattern and the character were printed on the coating surface of the vapor deposition surface with a gravure printing machine. A two-pack curable urethane-based adhesive is applied to the printed surface of the printed silicon oxide vapor-deposited biaxially stretched PET film, and an unstretched PP film having a thickness of 60 μm and a width of 760 mm (product name “P1147”) is used as a heat sealable film. ", Manufactured by Toyobo Co., Ltd.) and slit to a width of 370 mm to obtain a laminated film B.

  (Laminated film C) Also, as the metal oxide vapor-deposited film, an aluminum oxide vapor-deposited biaxially stretched PET film (product name “1011HG”, manufactured by Toray Film Processing Co., Ltd.) having a thickness of 12 μm and a width of 760 mm is selected. A two-component curable urethane adhesive was applied to one side of a 760 mm biaxially stretched PA film (product name “Bonyl W”, manufactured by Kojin Co., Ltd.) After bonding, a pattern and characters were printed on the PA film surface of the bonded film by a gravure printing machine. A two-component curable urethane adhesive is applied to the printed surface of the printed laminated film, and an unstretched PP film (product name “P1147”, Toyobo Co., Ltd.) having a thickness of 60 μm and a width of 760 mm is applied as a heat-sealable film. After lamination, a laminated film C was obtained by slitting to a width of 370 mm.

  (Laminated film D) As a metal oxide vapor-deposited film, a silicon oxide vapor-deposited biaxially stretched PA film (product name “IB-ON-FRC”, manufactured by Dai Nippon Printing Co., Ltd.) having a thickness of 15 μm and a width of 760 mm is selected. The pattern and the character were printed on the coating surface of the vapor deposition surface with a gravure printing machine. A two-pack curable urethane anchor coating agent is applied to the printed surface of the printed silicon oxide vapor-deposited biaxially stretched PA film, and a heat-sealable film having a thickness of 60 μm and a width of 780 mm is obtained by extrusion lamination of molten PE resin. After a PE film (product name “L4102”, manufactured by Toyobo Co., Ltd.) was bonded together, it was slit to a width of 370 mm to obtain a laminated film D.

  (Manufacture of Seal Bar for Bag Making Machine) Next, a point seal bar for bag making machine is manufactured. A total of four point seal bars according to the present invention in which the central portion of a normal hot plate for point seal was cut in the vertical direction to a width of 5 mm and a depth of 3 mm, one set for the top and bottom and two times for the seal. Further, a horizontal seal bar having a width of 20 mm, in which one capsule-shaped cut-out having a width of 9 mm, a length of 17 mm, and a depth of 3 mm was provided at a position where the zipper hits, was manufactured.

  (Examples 1-4) (Manufacture of bag body) The laminated films A to D are hung on a bag body making machine with a zipper on which the seal bar according to the present invention is set, and the width (zipper length) is 100 mm. A zipper cutting end of about 170 mm in length, 10 mm in heat seal width, 25 mm in the upper zipper part unsealed width, 3 mm deep and 1 mm in width on both sides of the heat seal part at the center of the zipper upper unsealed part Four types of three-sided sealed bag bodies with zippers of Examples 1 to 4 according to the present invention in which 2 mm was unsealed were produced. In addition, a PP resin zipper (product name “PP-13”, manufactured by CI Kasei Co., Ltd.) is used for the laminated films A to C, and a linear low density PE resin zipper (product name “LL-” is used for the laminated film D). 13 ", manufactured by CI Kasei Co., Ltd.).

  (Example 5) (Manufacture of bag body) Zippered studying pouch bag in which the laminated film D and a film obtained by slitting the laminated film D as a bottom material into a width of 70 mm are set with the seal bar according to the present invention. Hang on body bag making machine, width (zipper length) 100mm, length 170mm, bottom material folding width 29mm, heat seal width 5mm, zipper part upper unsealed width 25mm, zipper part upper unsealed part upper end 20mm A standing pouch with a zipper of Example 5 in which a notch having a depth of 3 mm and a width of 1 mm was provided on both sides of the heat seal portion and the zipper cut end portion was about 2 mm unsealed was produced. A linear low-density polyethylene resin zipper (product name “LL-13”, manufactured by CII Kasei Co., Ltd.) was attached.

  (Comparative Examples 1-4) Using the same laminated films A to D, zipper, and bag making machine used in the above examples, the point seal bar and the horizontal seal bar with a width of 20 mm are all normal, without a shaving part. Bag making that differs only in the use of a solid seal bar, width (zipper length) 100mm, length 170mm, heat seal width 10mm, zipper part upper unsealed width 25mm, side of zipper upper part unsealed part center Three-sided seal with zippers of Comparative Examples 1 to 4, with notches having a depth of 3 mm and a width of 1 mm on both sides of the heat seal part and crushing the zipper of the horizontal heat seal part, with no unsealed part at the zipper cut end Four types of bags were produced.

  (Examples 6 to 10) (Manufacture of packaging) Eight types of bags manufactured in Examples 1 to 5 and Comparative Examples 1 to 4 were filled with 100 ml of water, and heated with an impulse sealer having a heat seal width of 5 mm. Alternatively, 100 packages each having a bottom heat seal were manufactured.

  (Execution of hot water treatment) Hot water is applied to the packaging body comprising the six types of bags of Examples 1 to 3 and Comparative Examples 1 to 3 manufactured using laminated films A to C among the packaging bodies. After performing a hot water treatment at 121 ° C. for 40 minutes using an injection-type retort sterilization pot, it was cooled with cooling water for 15 minutes. Moreover, the packaging body which consists of two types of bags of Examples 4, 5 and Comparative Example 4 manufactured using the laminated film D is a boil treatment at 95 ° C. for 30 minutes in a steam-heated stainless steel double jacket kettle. Then, the mixture was cooled with water at 20 ° C. for 20 minutes.

  (Evaluation method) Apply a red penetrant (product name “AGELESS SEAL CHECK”, manufactured by Mitsubishi Gas Chemical Co., Ltd.) to the end of the zipper cut end of the package bag that has been treated with hot water. An appearance inspection was conducted, and the penetration of the red penetrant was evaluated as delamination of the laminated film. Table 1 shows the number of bags of each of the bags 1 to 5 and Comparative Examples 1 to 4 that were visually inspected and from which the laminated film was peeled off.

  (Evaluation results) As shown in Table 1, Examples 1 to 5 had no film peeling, but in the bags of Comparative Examples 1 to 4, the dyeing solution was zipper cut at all of the laminated films A to D. In some samples, there was a bag body that soaked between the laminate layers of the part, and at first glance, there was film peeling at the zipper cut end.

  (Industrial applicability) The main use of the zippered bag for hot water treatment of the present invention is a food product that can be obtained by subjecting a sealed package to hot water treatment such as retort treatment, boil treatment or steam sterilization, Pharmaceuticals, cosmetics, medical equipment, etc. However, it is not particularly limited as long as it can be hydrothermally treated and requires storage.

1: Bag with zipper for hot water treatment 2: Zipper 3: Notch 4: Point seal part 5: Upper heat seal part 6: Horizontal heat seal part 7: Cutting position 8: Zipper heat seal part 9: Fitting part 10 : Unsealed part 11: Zipper tape base 12: Bottom heat seal part

Claims (4)

Using a laminated film composed of a transparent deposited film and a heat-sealable film on which at least a metal oxide is deposited,
The heat sealable film surfaces of the laminated film are opposed to each other to form a horizontal heat seal part on both sides and an upper heat seal part on the upper side by heat sealing,
A zipper having a zipper tape base and a fitting portion that can be freely opened and closed is sandwiched between the lateral heat seal portions on both sides by a heat seal,
The zipper tape base is a zipper for hot water treatment, in which a zipper heat seal portion is formed by heat seal film surface and heat seal of opposing laminated films, and the inside is partitioned by an openable / closable fitting portion of the zipper With a bag,
The end portions of the zipper on both sides and the end portions of the horizontal heat seal portions respectively match,
A bag body with a zipper for hot water treatment, which is provided with a point seal that crushes the fitting portion and heat seals except for the vicinity of the end portions of the lateral heat seal portions on both sides sandwiching the zipper.   The bag body with a zipper for hot water treatment according to claim 1, wherein the bag is a self-standing bag having the upper heat seal portion as an opening and the bottom portion heat-sealed with a seal pattern in a shape that provides self-supporting properties. .   Opening notch on at least one side of the horizontal heat seal part between the upper heat seal part and the zipper or between the upper heat seal planned part and the zipper that becomes the upper heat seal part after filling the contents The bag body with a zipper for hot water treatment according to any one of claims 1 to 2, wherein the bag body is provided.   The package with a hot water treatment zipper characterized by filling the contents with the zipper for hot water treatment according to any one of claims 1 to 3 and performing a heat treatment with water or steam. .

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