JP5365466B2 - Stretch blow-molded container with inner-sealed sealed outlet - Google Patents

Description

  The present invention relates to a stretch blow molded container with a spout, and a spout with an inner seal in which an inner seal is attached to the opening of the spout of the container filled with the contents so that the container can be peeled off. The present invention relates to a stretch blow-molded container with an inner seal sealed-type outlet having a cap on the part.

  In general, a stretch blow molded container with a spout sealed with an inner seal (sealing sheet member) is a preform with a spout (bottomed) made of a thermoplastic resin, which is previously provided with a spout and a trunk for stretching. (Parison) is formed by injection molding, and then the body for stretching of the preform with a spout is loaded into a female mold having a container shape, and the body for stretching (of the preform is placed in the mold). It is heated (at a temperature below the glass transition point) and stretch blow molded into a container shape by air blow to obtain a stretch blow molded container with a spout.

  In Patent Document 1, a preform without a spout (a bottomed parison having only a stretching body portion) is injection-molded in advance, the preform is stretch-blow-molded into a container shape, A method of molding a stretch blow molded container with a spout by fitting and fusing a spout portion separately injection-molded to a portion corresponding to the spout is disclosed.

  In the packaging process of filling and packaging the liquid contents in the stretch blow molded container with a spout obtained in this way, first, in the filling process, the spout portion of each stretch blow molded container with a spout is filled in the filling machine. The contents are filled from the opening. Subsequently, in the sealing step of the spout opening, the inner seal (sealable composite sheet) is detachably attached to the opening of the spout and the container is sealed. A cap formed in advance is screwed or fitted to the spout portion by a manual method or an automatic lid method to apply the cap. In this way, a stretch blow molded container with an inner seal sealing type outlet filled with the contents is produced.

  Thus, a stretch blow molded container with a spout obtained by stretching a preform with a spout (bottomed parison) or a preform without a spout (bottomed parison) obtained by stretch blow molding Filling and packaging of the stretch blow molded container with an inner seal sealed-type spout produced using a stretch blow molded container with a spout with a spout attached to the stretch blow molded container after the filling process and the sealing process, And a lidding process.

Japanese Patent Publication No. 60-17663

  An object of the present invention is to provide a stretch-blow-molded container with an inner-sealed sealed-type spout, which includes a filling process that is a filling and packaging process of the container, a sealing process, and a lid-covering process that covers a cap that has been previously molded. Among the processes, the lid-covering process was improved, and the conventional lid-covering process was achieved by injecting the resin from the tip of the spout part to the periphery by an injection method to form a cap that can be covered simultaneously with molding. It is an object of the present invention to provide a container capable of improving the production efficiency in filling and packaging of stretch blow-molded containers with an inner seal sealed-type spout by eliminating apparatus adjustment work such as a lid covering apparatus and the process.

  According to the first aspect of the present invention, the stretch blow-molded container body A with a spout is filled with contents from the opening 4a of the spout 4 and an inner seal is formed in the opening 4a of the spout 4. 5 is attached in a peelable manner, the container A is hermetically sealed, and in the stretch blow molded container with an inner seal sealed-type spout where the cap B is covered with the spout 4, the opening is sealed by the inner seal. The cap B applied to the spout part 4 of the stretched blow molded container body A with the spout used as the core part of the injection mold has the spout part 4 at a predetermined interval. The space formed by coating with the cavity of the injection mold is used as the cavity space of the injection mold, and the molten resin is injected into the cavity space. Is a stretch blow molded container with inner seal blocked form a spout, characterized in that it is molded by cooling and solidifying the injection to.

  The invention according to claim 2 of the present invention is the invention according to claim 1, wherein the resin of the cap B and the resin of the spout part 4 of the container body A have wettability, functional group position, and molecular weight distribution. One or more of the resin characteristics are different, and the resin of the cap B and the resin of the spout 4 of the container main body A are easily peeled without being in close contact with each other at the interface. It is a stretch blow-molded container with an inner seal sealed-type spout characterized by being possible.

  The invention according to claim 3 of the present invention is the invention according to claim 1 or 2, wherein both the resin of the cap B and the resin of the spout 4 of the container body A are polyolefin-based thermoplastic resins. This is a stretch blow molded container with an inner seal sealed-type outlet.

  The invention according to claim 4 of the present invention is the invention according to claim 1 or 2, wherein one of the resin of the cap B and the resin of the spout part 4 of the container body A is a polyolefin-based thermoplastic resin. The other is a stretch blow-molded container with an inner seal sealed-type spout characterized by being a polystyrene terephthalate thermoplastic resin.

  The invention according to claim 5 of the present invention is the invention according to any one of claims 1 to 4, wherein the inner seal 5 is a laminated sheet, and a surface resin is provided on a side of the laminated sheet in contact with the cap B. The resin of the cap B and the resin constituting the surface resin layer of the inner seal 5 are different in one or more characteristics among the resin characteristics of wettability, functional group position, and molecular weight distribution, The stretch blow-molded container with an inner-sealed sealed-type spout characterized by being close to each other at the interface but without being in close contact and being easily peelable.

  The invention according to claim 6 of the present invention is the invention according to any one of claims 1 to 5, wherein both the resin of the cap B and the resin constituting the surface resin layer of the inner seal 5 are polyolefins. It is a stretch blow-molded container with an inner seal sealed-type spout characterized by being a thermoplastic resin.

  The invention according to claim 7 of the present invention is the invention according to any one of claims 1 to 5, wherein either one of the resin of the cap B and the resin constituting the surface resin layer of the inner seal 5 is provided. Is a stretch blow-molded container with an inner-sealing sealed outlet, characterized in that is a polyolefin-based thermoplastic resin and the other is a polystyrene terephthalate-based thermoplastic resin.

The stretch blow-molded container with an inner seal sealing type spout of the present invention is a cap filling step in the covering step among the three steps of the contents filling step, the sealing step, and the covering step in the filling and packaging step of the container. The spout 4 is a core part of the injection mold, and the space formed by covering the outer surface of the core part with the cavity part of the injection mold at a predetermined interval is the cavity space of the injection mold. As a part, the molten molten resin is injected into the cavity space part by an injection method and cooled and solidified.

  As described above, the container of the present invention is a container that can inject the resin from the tip of the spout portion of the container to the periphery thereof by the injection method and cover the cap B at the same time as the molding. Yes, it is possible to eliminate device adjustment work such as the lid application device in the conventional lid application process and the complexity of the process, and to improve the production efficiency in the filling and packaging of the stretch blow molded container with the inner seal sealing type spout The container which can be provided is provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of a stretch blow-molded container with a spout for producing an inner-seal-sealed mold spout-equipped stretch blow-molded container of the present invention and an injection mold used for the lid of the container. The side sectional view of the stretch blow molding container with an inner seal blockade type spout of the present invention. The sectional side view explaining the state which removed and opened the cap from the stretch blow molding container with an inner seal sealing type spout of the present invention.

  The stretch blow molded container with an inner seal sealed outlet according to the present invention will be described in detail below based on the embodiment thereof. FIG. 1 shows the stretch blow molded container with an inner seal sealed outlet according to the present invention, It is the whole side view explaining the lid covering process of the container.

  As shown in FIG. 1, the stretch blow-molded container with an inner seal sealing type spout of the present invention is a stretch blow-molded container body A with a spout that has been molded in the stretch blow-molding process in the covering step in advance. Are injected into a cavity mold C for injection, and the cap B is injection-molded.

  The stretch blow molded container main body A with a spout has a cylindrical container body 1, a bottom 2 at the lower end, a shoulder 3 at the upper end, and an axis O of the container body 1 through its shoulder. It comprises a cylindrical spout part 4 at the top of the part 3, and the spout part 4 has a lid engaging part 4b (screw part or concave-convex fitting part) for covering a cap to be described later. Is provided.

  After the container body A is filled with the liquid content L from the upper end opening 4a of the spout port 4 by a filling device, a sheet-like inner seal 5 is formed in the upper end opening 4a of the spout port 4. The container body A is stuck and sealed.

  As shown in FIG. 1, the spout 4 of the container body A to which the inner seal 5 is attached is loaded into a cavity mold C for injection, and the spout 4 is formed of the injection mold C. It is a core part. On the other hand, the outer surface of the core portion (outlet portion 4) is covered with a cavity portion 11 (for example, capable of opening and closing in the left-right direction) of the injection mold C at a predetermined interval from the outer surface. A space for injection molding (for the thickness of the cap) is formed between the outer surface of the core portion (outlet portion 4) and the inner surface of the cavity portion 11.

In addition, as shown in FIG. 1, the spout part 4 (including the engaging part 4b) is included so that the spout part 4 (core part) of the container body A can be easily loaded into the cavity part 11 of the injection mold C. It is necessary to set the clearance d for loading by increasing the inner diameter of the cavity lower end portion 11a of the cavity portion 11 with respect to the outer diameter of the cylinder.

  Therefore, a gap as a loading clearance is generated between the cavity lower end portion 11a of the cavity portion 11 and the outer periphery of the spout portion 4, so that the injected molten resin does not leak from the gap. As shown in the figure, an auxiliary cavity portion 13 (for example, openable in the left-right direction) is provided outside the cavity portion 11, and a mold as a clearance for loading d is sealed by a lower end portion 13 a of the auxiliary cavity portion 13. It can be a structure.

  As shown in FIG. 1, the stretch blow-molded container with an inner seal sealed type outlet of the present invention has the outlet part 4 of the container body A as a core part of an injection mold, and the core part (outlet part 4 The space portion 14 formed by covering the outer surface of the mold with the cavity portion 11 of the injection mold at a predetermined interval is used as the cavity space portion 14 of the injection mold.

  An inner seal portion of the spout portion 4 of the container main body A is obtained by injecting the heated molten resin S into the cavity space portion 14 from the injection injection nozzle portion 12 into the cavity space portion 14 by an injection method and cooling and solidifying. A cap B comprising a cap top plate portion b1 and a cap cylinder wall portion b2 is formed on the upper portion of the container body A with the spout portion 4 of the container body A as a core, and the cap B is covered with the spout portion 4 Then, as shown in FIG. 2, the stretch blow molded container with the inner seal sealed-type spout of the present invention that is covered with the cap B screwed to the spout 4 of the container main body A is obtained. It is.

  In the container of the present invention, the cap B of the injection-molded cap B is a spout part of the container main body A, as in the embodiment shown in FIGS. 1 and 2. In addition to the screw-on type that is covered with the screw part (engagement part) 4b, the concave-convex fitting type may be used. For example, the outer surface of the spout part 4 (core part) The present invention in which the cap B is covered with the concave and convex fitting by changing the shape or / and the inner surface shape of the cavity 11 covering the spout part 4 and injection-molding the cap B as described above. It is possible to obtain a stretch blow molded container with an inner seal sealing type outlet.

  The resin of the cap B and the resin of the container main body A (cylindrical container body 1, bottom 2, shoulder 3, spout 4) have resin properties such as wettability, functional group position, and molecular weight distribution. Among them, one or more characteristics are different, and the resin of the cap B and the resin of the spout part 4 of the container body A are in close contact with each other but are not in close contact, and are easily peeled off. It is possible.

  For example, both the resin of the cap B and the resin of the outlet 4 of the container body A may be a polyolefin-based thermoplastic resin (polyethylene, polypropylene), or the resin of the cap B and the container body A. One of the resins of the spout portion 4 may be a polyolefin-based thermoplastic resin (polyethylene or polypropylene), and the other may be a polyethylene terephthalate-based thermoplastic resin.

  The inner seal portion 5 is a single layer sheet or a laminated sheet, and both the resin of the cap B resin and the resin constituting the surface resin layer of the inner seal 5 may be a polyolefin-based thermoplastic resin, or the cap. One of the B resin and the resin constituting the surface resin layer of the inner seal 5 may be a polyolefin-based thermoplastic resin and the other may be a polystyrene terephthalate-based thermoplastic resin.

As shown in FIG. 1, a surface resin layer is provided as the surface layer 5a, or a surface aluminum layer is provided at least on the side of the inner seal portion 5 in contact with the cap B. As the surface resin layer 5a, the resin of the cap B and the resin constituting the surface resin layer 5a of the inner seal 5 are one or one of the resin properties of wettability, functional group position, and molecular weight distribution. The above characteristics are different, and although they are in close contact with each other at the interface, they are not in close contact and can be easily peeled off.

  For example, as shown in FIG. 1, the inner seal portion 5 adhered to the opening 4 a at the upper end of the spout portion 4 is formed on the side in contact with the cap B as a surface layer 5 a that is easily peelable from the resin of the cap B. Use a surface resin layer 5a made of polypropylene or a surface aluminum layer 5a, and a back surface layer 5b in which an adhesive layer 5b that is peelably bonded to the opening 4a of the spout 4 of the container body A is used. Can do.

  Both the resin of the cap B and the resin constituting the surface resin layer of the inner seal 5 may be a polyolefin-based thermoplastic resin, or constitute the surface resin layer of the cap B and the inner seal 5. One of the resins may be a polyolefin-based thermoplastic resin, and the other may be a polystyrene terephthalate-based thermoplastic resin.

  The container body A (tubular container body 1, bottom 2, shoulder 3, outlet 4) of the stretch blow molded container with an inner seal sealed outlet of the present invention, cap B, inner seal 5 Examples of materials to be adopted are shown below.

<Example 1>
(Polypropylenes with different characteristics among wettability, functional group position, and molecular weight distribution are used.)
Container body A; polypropylene cap B; polypropylene inner seal 5 (laminated sheet); (cap side) polypropylene / polypropylene (opening side)

<Example 2>
(Polypropylenes with different characteristics among wettability, functional group position, and molecular weight distribution are used.)
Container body A; polypropylene cap B; polypropylene inner seal 5 (laminated sheet); (cap side) polypropylene / aluminum / adhesive (opening side)

<Example 3>
(Polypropylenes with different characteristics among wettability, functional group position, and molecular weight distribution are used.)
Container body A; polypropylene cap B; polypropylene inner seal 5 (laminated sheet); (cap side) aluminum / aluminum / adhesive (opening side)

<Example 4>
(Polypropylenes with different characteristics among wettability, functional group position, and molecular weight distribution are used.)
Container body A: Polyethylene terephthalate (PET)
Cap B; Polypropylene inner seal 5 (Laminated sheet); (Cap side) Polypropylene / Polypropylene (Opening side)

<Example 5>
(Polypropylenes with different characteristics among wettability, functional group position, and molecular weight distribution are used.)
Container body A: Polyethylene terephthalate (PET)
Cap B; polypropylene inner seal 5 (laminated sheet); (cap side) polypropylene / aluminum / adhesive (opening side)

<Example 6>
Container body A: Polyethylene terephthalate (PET)
Cap B; polypropylene inner seal 5 (laminated sheet); (cap side) aluminum / aluminum / adhesive (opening side)

A ... Container body B ... Cap b1 ... Top plate part b2 ... Cylindrical wall part C ... Injection mold S ... Injection heated molten resin L ... Liquid content 1 ... Cylindrical body part 2 ... Bottom part 3 ... Shoulder part 4 ... Outlet part 4a ... Opening part 4b ... Engagement part (screw part)
5 ... Inner seal part 11 ... Cavity part 12 ... Injection nozzle part 12a ... Injection path 13 ... Auxiliary cavity part 14 ... Injection space part

Claims (7)

  The stretch blow molded container main body A with a spout is filled with the contents from the opening 4a of the spout 4 and the inner seal 5 is detachably attached to the opening 4a of the spout 4 Stretched blow-molded container body with a spout in which A is sealed and the opening is sealed with an inner seal in a stretch-blow-molded container with an inner-sealed sealed spout where the spout 4 is covered with a cap B The cap B applied to the spout port 4 is used as the core part of the injection mold, and the outer surface of the core part is covered with the cavity part of the injection mold at a predetermined interval. The space formed is used as the cavity space of the injection mold, and the molten molten resin is injected into the cavity space by the injection method and then cooled and solidified. Inner seal sealed type spout-equipped stretch blow molded container, characterized in that there.   The resin of the cap B and the resin of the spout part 4 of the container main body A are different in one or more characteristics among the resin characteristics of wettability, functional group position, and molecular weight distribution. The inner seal sealed pouring port according to claim 1, wherein the resin and the resin of the pouring port portion 4 of the container main body A are in close contact with each other but are not easily adhered to each other. Stretch blow molded container.   3. The stretch blow molding with an inner seal sealed type outlet according to claim 1, wherein both the resin of the cap B and the resin of the outlet 4 of the container body A are polyolefin-based thermoplastic resins. container.   3. The resin of the cap B and the resin of the spout part 4 of the container body A, one of which is a polyolefin-based thermoplastic resin and the other is a polystyrene terephthalate-based thermoplastic resin. The stretch blow-molded container with an inner seal sealed-type spout as described.   The inner seal 5 is a laminated sheet, and a surface resin layer is provided on the side of the laminated sheet that contacts the cap B. The resin of the cap B and the resin constituting the surface resin layer of the inner seal 5 are wettability, One or more of the resin characteristics of the functional group position and the molecular weight distribution are different, and they are close to each other at the interface, but are not peeled easily and can be easily peeled. The stretch blow-molded container with an inner seal sealed-type spout according to any one of 1 to 4.   The inner seal sealing mold according to any one of claims 1 to 5, wherein both the resin of the cap B and the resin constituting the surface resin layer of the inner seal 5 are polyolefin-based thermoplastic resins. Stretch blow molded container with spout.   6. The resin of the cap B and the resin constituting the surface resin layer of the inner seal 5, one of which is a polyolefin-based thermoplastic resin and the other is a polystyrene terephthalate-based thermoplastic resin. The stretch blow molded container with an inner seal sealing type spout according to any one of the above.

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