JP5955506B2 - Spout manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a spout attached to a packaging bag formed into a bag shape by, for example, a resin sheet.

  Conventionally, for the purpose of suppressing denaturation of the contents contained therein, a packaging bag with a spout has been known in which not only a packaging bag (container body) portion formed in a bag shape by a resin sheet but also a gas barrier property is imparted to a spout portion. ing. For example, Patent Document 1 discloses that a gas barrier property is applied to a spout by embedding a cylindrical gas barrier laminate film composed of a gas barrier film layer and a resin layer laminated on both surfaces of the film layer in a peripheral wall of the spout. A technique for imparting is disclosed.

International Publication No. 2004/013008 Pamphlet

  By the way, the spout of Patent Document 1 is manufactured mainly through the following two injection molding processes. First, a cylindrical gas barrier laminate film is prepared, and an inner peripheral wall is formed on the inner peripheral surface of the gas barrier laminate film by an insert injection molding method. Next, the mold is changed, and the outer peripheral wall is formed on the outer peripheral surface of the gas barrier laminate film in which the inner peripheral wall is formed again by the insert injection molding method. As described above, the spout of Patent Document 1 needs to go through a plurality of injection molding processes at the time of manufacture, and also requires a plurality of molds for molding the inner peripheral wall and the outer peripheral wall, so that the production cost is high. The configuration was not suitable for actual production.

The present invention has been made in view of these conventional circumstances, an object thereof is to a low cost manufacturing child the spout Ru excellent gas barrier properties.

In order to achieve the above object, the spout manufacturing method according to claim 1 includes an inner layer and an outer layer made of the first resin, and a second resin having a gas barrier property, which is located between the inner layer and the outer layer. and an intermediate layer comprising a peripheral wall of the formed tubular comprising, prior Symbol intermediate layer made of a second resin, provided on the entire circumference of the peripheral wall, both end portions of the peripheral wall is formed by the first resin The spout manufacturing method is characterized in that it is integrally formed by co-injection molding .

  In the above configuration, the peripheral wall of the spout has a multilayer structure having an inner layer, an outer layer, and an intermediate layer, and the intermediate layer is formed of a resin having gas barrier properties. Thereby, the gas barrier property based on the intermediate | middle layer which has gas barrier property is provided with respect to the surrounding wall part of a spout. In addition, since the inner layer, outer layer, and intermediate layer of the peripheral wall are all formed of a resin material, the inner layer, outer layer, and intermediate layer constituting the peripheral wall can be integrally and simultaneously formed by using co-injection molding. It becomes. And by adopting co-injection molding, a spout can be manufactured by one injection molding process using one mold, and the cost at the time of manufacturing can be kept low.

Method for producing a spout according to claim 2 is the invention according to claim 1, the outer peripheral lower portion of the peripheral wall of the spout attaching portion of the adhesive is protruded, the intermediate layer comprising the second resin Is provided so as to be located in the mounting portion.

  An attachment portion having a generally rhombus shape in top view may be provided on the lower outer periphery of the peripheral wall of the spout for the purpose of enhancing the adhesion to a bag-like container body made of a resin sheet or the like. When such an attachment portion is provided, it is required to provide a gas barrier property to the attachment portion in addition to the peripheral wall portion of the spout. And in the attachment part, it is necessary to provide the gas barrier property in the axial direction of a surrounding wall unlike the surrounding wall part which should provide the gas barrier property in the thickness direction (radial direction).

  Here, although the spout of patent document 1 is a structure which provides gas-barrier property with the cylindrical gas-barrier laminated film embed | buried in the surrounding wall, in this structure, only the gas-barrier property in the thickness direction of a surrounding wall is obtained. There is no gas barrier property in the axial direction of the peripheral wall. Further, the gas barrier property is limited to the peripheral wall portion, and does not extend to a portion protruding from the outer peripheral wall (for example, a protrusion for engaging the mounting portion or the cap). Therefore, in the configuration of Patent Document 1, it is not possible to give a suitable gas barrier property to a spout including an attachment portion, particularly to the attachment portion.

  With respect to such a problem, in the above-described configuration, an intermediate layer having gas barrier properties is located inside the mounting portion in addition to the peripheral wall portion. Therefore, the gas which tries to pass through the attachment portion in the axial direction of the peripheral wall can be suitably blocked by the intermediate layer located in the attachment portion.

According to the present onset Akira, it can be manufactured at low cost the spout to exhibit excellent gas barrier properties.

(A) is a perspective view of the spout of embodiment, (b) is a longitudinal cross-sectional view of the spout of embodiment. (A)-(e) is the schematic which shows the shaping | molding method of the spout of embodiment. (A) is a disassembled perspective view of the packaging bag with a spout of embodiment, (b) is a perspective view of the packaging bag with a spout of embodiment. The longitudinal cross-sectional view of another example spout. The longitudinal cross-sectional view of another example spout. Schematic which shows the shaping | molding method of the spout of another example. Schematic which shows the shaping | molding method of the spout of another example. (A) is a perspective view of a cap, (b) is sectional drawing of a cap.

Hereinafter, the spout 10 of this embodiment and the packaging bag with a spout are demonstrated based on drawing.
As shown in FIGS. 1A and 1B, the spout 10 includes a cylindrical peripheral wall 11, and a mounting portion 12 having a substantially rhombus shape in a top view protrudes from a lower outer periphery of the peripheral wall 11. The attachment portion 12 is a part that is bonded to the bag-like container body 20 constituting the spout-equipped packaging bag (see FIG. 3), and the side surface 12a of the attachment portion 12 is formed so as to form a smooth curved surface. ing. Further, a flange 13 is projected from the outer peripheral central portion of the peripheral wall 11.

  As shown in FIG. 1B, the peripheral wall 11 has a three-layer structure including an inner layer 11a made of the first resin, an intermediate layer 11b made of the second resin, and an outer layer 11c made of the first resin. I am doing. As a 1st resin which forms the inner layer 11a and the outer layer 11c, the well-known synthetic resin generally used for a spout can be used, for example, a low density polyethylene, a medium density polyethylene, a high density polyethylene, linear (line | wire) Shape) Use of thermoplastic resin such as low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-propylene copolymer. Can do.

  As the second resin for forming the intermediate layer 11b, a synthetic resin having gas barrier properties is used. As the resin having gas barrier properties, a blocking resin that blocks the passage of oxygen and an absorbing resin that absorbs oxygen can be used. Examples of the blocking resin include nylon, ethylene vinyl alcohol, polyvinylidene chloride, polyethylene naphthalate, and polyacrylonitrile. Examples of the absorbent resin include an oxygen scavenger-containing resin in which a substance (eg, iron or sugar) generally used as an oxygen scavenger is kneaded in the resin listed as the first resin.

  Further, both ends of the peripheral wall 11 are formed of the first resin, and the intermediate layer 11b made of the second resin is entirely covered with the first resin (the inner layer 11a, the outer layer 11c, and both ends). It is in the state. Moreover, the attaching part 12 and the flange 13 are formed with 1st resin.

  When manufacturing the spout 10 of the present embodiment, a co-injection molding method (for example, a co-injection molding method described in JP-A-5-253973) can be employed. 2A to 2E are views showing a mode in which the spout 10 of the present embodiment is co-injection molded using a valve gate type multilayer injection molding apparatus 30 (hereinafter referred to as a molding apparatus 30). is there.

  The molding device 30 is disposed so as to surround the annular first passage 32 having the annular injection gate 31, the second passage 33 extending coaxially from the first passage 32, and the second passage 33. And a third passage 34 connected to the first passage 32 in the vicinity of the injection gate 31. The second passage 33 is connected to a housing portion (not shown) for housing the second resin R2, and the third passage 34 is connected to a housing portion (not shown) for housing the first resin R1. Yes.

  A cylindrical movable member 35 that is slidable in the axial direction is disposed in the first passage 32 and the second passage 33. When the movable member 35 slides in the first passage 32 and the second passage 33, the connection state between the first passage 32 and the third passage 34 and the connection state between the first passage 32 and the second passage 33. Is controlled.

  Below, the aspect which shape | molds the spout 10 of this embodiment using the shaping | molding apparatus 30 is demonstrated. As a state before starting the molding, the movable member 35 is located at the most projecting position, which is a position where the first passage 32 and the third passage 34 are blocked and the injection gate 31 is closed (FIG. 2 ( a)). From this state, the movable member 35 is retracted to open the injection gate 31 and connect the first passage 32 and the third passage 34 (see FIG. 2B). Accordingly, only the first resin R1 is injected from the injection gate 31 into the cavity C through the third passage 34 and the first passage 32.

  After injecting a predetermined amount of the first resin R1, the movable member 35 is further retracted to connect the first passage 32 and the second passage 33 (see FIG. 2C). As a result, the second resin R2 is supplied to the center of the first resin R1, and the first resin R1 and the second resin R2 from the injection gate 31 in a state where the second resin R2 is present in the first resin R1. The resin R2 is co-injected.

  After the first resin R1 and the second resin R2 are co-injected by a predetermined amount, the movable member 35 is advanced to disconnect the connection between the first passage 32 and the second passage 33 (see FIG. 2D). Thus, only the first resin R1 is injected again from the injection gate 31. When the first resin R1 and the second resin R2 are filled in the entire cavity C, the movable member 35 is advanced to the most projecting position, and the first resin R1 is injected from the injection gate 31. Is stopped (see FIG. 2E). Thus, the spout 10 of this embodiment can be integrally molded as a whole by a single injection molding process by using the co-injection molding method.

  Next, the packaging bag with a spout is demonstrated based on Fig.3 (a) and (b). The packaging bag with a spout is formed by attaching the spout 10 to a container body 20 formed into a bag shape with a resin sheet. The container body 20 is composed of a pair of side sheets 21 and a bottom folded sheet 22 disposed between the side sheets 21 and is heated upward by fusing the edges of the opposing sheets together. It is formed in an open bag shape. And in the upper opening part of the container main body 20, the spout 10 is attached to the container main body 20 by heat-seal | fusing the upper edge of the side surface sheet 21, and the side surface 12a of the attaching part 12 of the spout 10. FIG.

  In addition, the resin sheet which has a well-known gas barrier property is used for the side sheet 21 and the bottom sheet 22 which comprise the container main body 20. FIG. Examples of the resin sheet having gas barrier properties include a multilayer resin sheet having an aluminum foil layer, an ethylene vinyl-alcohol copolymer layer, a ceramic vapor deposition film layer, and the like as a gas barrier layer.

Next, operational effects in the present embodiment will be described below.
(1) The spout 10 of this embodiment includes an inner layer 11a and an outer layer 11c made of a first resin, and an intermediate layer 11b made of a second resin that is located between the inner layer 11a and the outer layer 11c and has a gas barrier property. The cylindrical surrounding wall 11 comprised from these is provided. Thereby, the gas barrier property based on the intermediate layer 11b having a gas barrier property is imparted to the peripheral wall 11 of the spout 10, and the inflow of gas (oxygen) from the outside to the inside of the peripheral wall 11 through the peripheral wall 11 of the spout 10 is suppressed. be able to. In particular, when the intermediate layer 11b is formed of an absorbent resin that absorbs oxygen, when the spout 10 is attached to a container such as a packaging bag, the intermediate layer 11b absorbs oxygen in the container, so that the container The inside can be in a low oxygen state.

  Further, the inner layer 11a, the intermediate layer 11b, and the outer layer 11c of the peripheral wall 11 are all made of a resin material, and the inner layer 11a, the intermediate layer 11b, and the outer layer 11c constituting the peripheral wall 11 are integrally and simultaneously formed by using co-injection molding. doing. Thereby, the spout 10 can be manufactured integrally by one injection molding process using a single mold, and the manufacturing cost can be kept low.

  (2) Both ends of the peripheral wall 11 of the spout 10 are formed of the first resin, and the entire periphery of the intermediate layer 11b made of the second resin is covered with the first resin. Thereby, when the content in the container provided with the spout 10 passes through the inside of the spout 10 and is supplied to the outside, it is possible to suppress the component contained in the second resin from adhering to the same content.

  (3) The packaging bag with a spout of this embodiment forms the container main body 20 with the resin sheet which has gas-barrier property. Thereby, gas barrier property is provided to both the spout 10 and the container main body 20, and it becomes a packaging bag with a spout suitable for accommodating the contents which require gas barrier properties, such as a foodstuff, enteral nutrient, blood transfusion. .

  In addition, this embodiment can also be changed and embodied as follows. Moreover, it is also possible to change the said embodiment like the structure of the combination of the following modification example mutually.

  -It is good also as a structure which has the some intermediate | middle layer 11b. In this case, the kind of resin forming each intermediate layer 11b may be the same or different. Further, the intermediate layers 11b may be disposed adjacent to each other, or another layer (for example, a layer made of the first resin) may be interposed between the intermediate layers 11b. For example, the intermediate layer 11b has a first intermediate layer made of a blocking resin that blocks the passage of oxygen, and a second intermediate layer formed inside the first intermediate layer and made of an absorbent resin that absorbs oxygen. And In this case, the oxygen in the container to which the spout 10 is attached can be absorbed by the second intermediate layer while the gas flow from the outside to the inside of the spout 10 is blocked by the first intermediate layer.

A further layer may be provided on the inner side of the inner layer 11a or the outer side of the outer layer 11c, and the peripheral wall 11 may be composed of four or more layers as a whole.
When the intermediate layer 11b is formed of an absorbent resin that absorbs oxygen, it is preferable that the oxygen in the container with the spout 10 is efficiently absorbed by the intermediate layer 11b. For example, as shown by a broken line portion in FIG. 1B, a hole 11d is provided in the inner layer 11a of the peripheral wall 11 so that the intermediate layer 11b is partially exposed, or the inner layer 11a is made thinner than the outer layer 11c to make the intermediate layer 11b thinner. It is preferable to form 11b on the inner side.

-You may provide engaging parts, such as a thread groove and a protrusion, for engaging a cap with the inner peripheral surface or outer peripheral surface of the peripheral wall 11.
-The attachment part 12 may be formed in a solid shape or may be formed in a hollow shape. Further, the attachment portion 12 and the flange 13 may be omitted.

  -As shown in FIG.4 and FIG.5, you may comprise so that the intermediate | middle layer 11b which consists of 2nd resin may be located inside the attaching part 12. FIG. When the attachment part 12 is provided in the outer peripheral lower part of the peripheral wall 11 of the spout 10, it is calculated | required to provide gas barrier property also to the attachment part 12 in addition to the peripheral wall 11 part. Therefore, as described above, by positioning the intermediate layer 11b having gas barrier properties inside the attachment portion 12 in addition to the peripheral wall 11 portion, the gas that is going to pass through the attachment portion 12 is located in the attachment portion 12. Can be blocked by the intermediate layer 11b.

  In the configuration shown in FIG. 4, the attachment portion 12 is formed in a solid shape. And it is comprised so that the intermediate | middle layer 11b may be located in the whole attachment part 12 by enlarging the thickness of the intermediate | middle layer 11b of the surrounding wall 11 in the site | part in which the attachment part 12 protruded.

  In the configuration shown in FIG. 5, the attachment portion 12 is formed of a substantially rhombic plate-like upper wall 12 b that protrudes laterally from the peripheral wall 11, and a side wall 12 c that is suspended from the periphery of the upper wall 12 b. It is made into the hollow shape opened to. Then, by positioning the intermediate layer 11b also in the upper wall 12b of the attachment portion 12, the upper wall 12b has an inner layer and an outer layer made of the first resin, and an intermediate layer made of the second resin, like the peripheral wall 11. It has a multilayer structure.

  In the configuration shown in FIG. 5, only the upper wall 12b of the attachment portion 12 has a multi-layer structure. However, the upper wall 12b and the sidewall 12c are arranged so that the intermediate layer 11b is also located in the side wall 12c of the attachment portion 12. Both may have a multilayer structure. Further, the intermediate layers in the peripheral wall 11, the upper wall 12 b of the attachment portion 12, and the side walls 12 c do not have to be all connected, and may be independent of each other. Further, when at least one of the upper wall 12b and the side wall 12c of the attachment portion 12 is formed in a multilayer structure similar to the peripheral wall 11, the matters described above with respect to the peripheral wall 11 (for example, the intermediate layer 11b made of the second resin) Can be applied as the configuration of the upper wall 12b and the side wall 12c of the attachment portion 12.

  Here, as a method of positioning the intermediate layer 11b inside the attachment portion 12 by using the co-injection molding method, for example, as shown in FIG. A method of additionally arranging a molding apparatus 30A for injection molding and injecting resin from a different direction from the molding apparatus 30 can be mentioned. Although FIG. 6 shows an example in which two molding apparatuses 30A are additionally arranged, the number of molding apparatuses 30A may be one or three or more.

  The co-injection molding is not limited to molding using a molding apparatus 30 having an annular injection gate 31 as shown in FIG. For example, as shown in FIG. 7, co-injection formation may be performed using a molding apparatus 30 having an injection gate 31 for injecting resin from one point.

  -It is good also as a spout with a cap provided with the cap which obstruct | occludes the opening side edge part of the spout 10. FIG. The shape of the cap and the engagement configuration with the spout 10 are not particularly limited, but for example, the configuration as shown in FIG. 8 is preferable.

  The cap 40 shown in FIG. 8 includes a plate-like upper wall 41 having substantially the same shape as the top view shape of the attachment portion 12 of the spout 10 and a peripheral wall 42 depending from the periphery of the upper wall 41 ( (See FIG. 8 (a)). Similar to the peripheral wall 11 of the spout 10, the upper wall 41 and the peripheral wall 42 of the cap 40 are located between the inner layer 40a and the outer layer 40c made of the first resin, and the inner layer 40a and the outer layer 40c, and have a gas barrier property. It is comprised in the multilayer structure which has the intermediate | middle layer 40b which consists of 2 resin (refer FIG.8 (b)). The cap 40 can also be formed by co-injection molding.

  As shown in FIG. 8B, a circular protrusion 43 having substantially the same diameter as the inner diameter of the peripheral wall 11 of the spout 10 is formed on the inner surface of the upper wall 41. The cap 40 can be attached to the spout 10 by fitting the protruding portion 43 of the cap 40 and the peripheral wall 11 of the spout 10.

  By attaching such a cap 40 to the spout 10, the inflow of gas from the opening side end of the spout 10 can be suppressed. 8B, the peripheral wall 42 of the cap 40 is formed in substantially the same shape as the attachment part 12 of the spout 10, and the lower end of the peripheral wall 42 is the attachment part of the spout 10 when attached to the spout 10. It is comprised so that it may contact | abut to the upper surface peripheral part of 12. Thereby, when the cap 40 is attached to the spout 10, the entire upper part of the spout 10 including the attachment portion 12 can be covered with the cap 40. Therefore, even if the spout 10 is configured to allow gas to flow through the attachment portion 12, in the state in which the cap 40 is attached, the upper wall 41 and the peripheral wall 42 of the cap 40 having the intermediate layer 40b having gas barrier properties, Gas distribution through the attachment portion 12 can be suppressed.

-You may use the spout 10 attached to containers (for example, paper packs) other than the packaging bag which consists of a resin sheet.
-Regarding the packaging bag with a spout, the shape of the container main body 20 is not specifically limited, What is necessary is just to be formed in the bag shape from the resin sheet.

  ・ The spout-equipped packaging bag is suitable for applications that contain contents having gas barrier properties, but is not limited to contents that require gas barrier properties, but also for applications that contain contents that do not require gas barrier properties. It may be used.

Next, a technical idea that can be grasped from the above embodiment and another example will be described.
(A) A cylindrical peripheral wall composed of an inner layer and an outer layer made of a first resin, and an intermediate layer made of a second resin having a gas barrier property, located between the inner layer and the outer layer, is co-injected. shaped by it formed integrally, the intermediate layer is made of a second resin, provided on the entire circumference of the peripheral wall, both end portions of the peripheral wall is formed by the first resin Luz Pauto.
(B) A spout comprising a cylindrical peripheral wall and an attachment portion projecting from an outer peripheral lower portion of the peripheral wall, wherein the peripheral wall includes an inner layer and an outer layer made of a first resin, and the inner layer and the outer layer. And an intermediate layer made of a second resin having a gas barrier property, and the intermediate layer made of the second resin is provided so as to be located in the mounting portion. To spout.

  (C) The mounting portion includes an upper wall protruding laterally from the peripheral wall, and a side wall depending from the periphery of the upper wall, and at least one of the upper wall and the side wall is made of a first resin. A spout comprising an inner layer and an outer layer, and an intermediate layer formed between the inner layer and the outer layer and having a gas barrier property.

  (D) A spout with a spout attached to a container body formed in a bag shape by a resin sheet having a gas barrier property, the spout projecting from a cylindrical peripheral wall and an outer peripheral lower portion of the peripheral wall The peripheral wall includes an inner layer and an outer layer made of a first resin, and an intermediate layer made of a second resin having a gas barrier property, which is located between the inner layer and the outer layer. The spout-equipped packaging bag is characterized in that the intermediate layer made of the second resin is provided so as to be positioned in the attachment portion.

  (E) a cap for closing the opening side end portion of the spout, the cap being located between the inner layer and the outer layer made of the first resin, and the second resin having a gas barrier property located between the inner layer and the outer layer A spout with a cap, characterized by comprising an intermediate layer.

  (F) The spout with a cap, wherein the cap is formed so as to cover an upper surface of the attachment portion of the spout in a state of being attached to the spout.

  R1 ... 1st resin, R2 ... 2nd resin, 10 ... Spout, 11 ... Peripheral wall, 11a ... Inner layer, 11b ... Intermediate layer, 11c ... Outer layer, 12 ... Mounting part, 13 ... Flange, 20 ... Container body, 21 ... side sheet, 22 ... bottom sheet.

Claims (2)

And inner and outer layers made of a first resin, located between the inner layer and the outer layer, a second peripheral wall of the formed tubular from the intermediate layer and made of a resin having gas barrier properties, before Symbol second An intermediate layer made of resin is provided on the entire circumference of the peripheral wall, and both ends of the peripheral wall are a method for producing a spout formed of the first resin ,
A spout manufacturing method, wherein the spout is integrally formed by co-injection molding . An attachment portion for bonding protrudes from the lower outer periphery of the peripheral wall of the spout ,
The spout manufacturing method according to claim 1, wherein the intermediate layer made of the second resin is provided so as to be positioned in the attachment portion .

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