JP6858450B2 - Method for manufacturing synthetic resin blow-molded containers and containers with contents - Google Patents

Description

The present invention relates to a synthetic resin blow-molded container having an outer layer body forming an outer shell of the container and an inner layer body housed inside the outer layer body, and a method for manufacturing a container containing contents.

Conventionally, an outer layer body forming an outer shell of a container having a mouth portion and a body portion and an inner layer body housed inside the outer layer body are provided, and an opening (outside air) communicating with the inner layer body is provided in the outer layer body. A synthetic resin blow-molded container capable of introducing outside air from the outside air introduction hole between the outer layer body and the inner layer body by providing an introduction hole) is known (for example, Patent Document 1). reference).

Further, such a synthetic resin blow-molded container is a tubular parison formed by laminating an outer layer made of synthetic resin and an inner layer formed of synthetic resin having low compatibility with the outer layer. Can be formed by extrusion blow molding. In that case, the opening formed in the pinch-off portion of the container by cutting off with the blow molding split die can be used as it is as the outside air introduction hole. That is, by breaking the outer layer body at the pinch-off portion of the container, the inner layer body can be peeled off from the outer layer body, and a slit-shaped outside air introduction hole can be provided.

Japanese Unexamined Patent Publication No. 2008-207860

Here, for example, as a method of filling a container with the contents of liquid foods such as soy sauce, soy sauce-containing seasonings, vinegar, cooking liquor, etc., and commercializing the contents, a filling step of filling the contents and a shower after the steps. It may include a cooling step of cooling the container and contents with a cooling liquid such as water. Further, before the cooling step, a sterilization step of injecting a sterilizing liquid such as high-temperature shower water to sterilize the container may be included.

However, when a liquid injection step such as a cooling step or a sterilization step of injecting a liquid into the container is performed on the synthetic resin blow-molded container as described above, the liquid flows from the outside air introduction hole to the inner space (outer layer body) of the container. And the inner layer).

The present invention has been developed to solve the above-mentioned problems, and is a synthetic resin blow-molded container capable of preventing the liquid from entering the inside of the container at the time of liquid injection after filling the contents, and the contents. An object of the present invention is to provide a method for manufacturing a container containing a substance.

The synthetic resin blow-molded container of the present invention is a synthetic resin blow-molded container including an outer layer body forming an outer shell of the container and an inner layer body provided inside the outer layer body.
It has a body portion in which one end is connected to a tubular mouth portion and the other end is closed, and a pinch-off portion located at the other end of the body portion.
The pinch-off portion is provided with a removal piece partitioned by the planned fracture portion.
By separating the removed piece along the planned fracture portion, an outside air introduction hole capable of introducing outside air is formed between the outer layer body and the inner layer body.
The removed piece is characterized in that at least one biting portion is formed in the removed piece so as to bite from one side surface of the removed piece toward the other side surface.

In the synthetic resin blow-molded container of the present invention, it is preferable that the removed pieces are formed with a plurality of the biting portions having the biting directions facing each other.

Further, in the synthetic resin blow-molded container of the present invention, it is preferable that the plurality of the biting portions are arranged so that the biting directions of the two adjacent biting portions face each other.

Further, in the synthetic resin blow-molded container of the present invention, the plurality of the biting portions are arranged in a staggered manner along the edge portion of the removed piece opposite to the planned fracture portion. preferable.

Further, in the synthetic resin blow-molded container of the present invention, it is preferable that the planned break portion is composed of a thin portion formed to be thinner than the removed piece.

Further, the method for producing a container containing the contents of the present invention using any of the above synthetic resin blow-molded containers is described.
A blow molding step of blow molding using a tubular parison in which the synthetic resin forming the outer layer body and the synthetic resin forming the inner layer body are laminated.
A filling step of filling the storage space of the synthetic resin blow molding container formed by the blow molding step with the contents, and a filling step of filling the contents.
After the filling step, a liquid injection step of injecting a liquid into the synthetic resin blow-molded container, and
After the liquid injection step, the process includes an outside air introduction hole forming step of separating the removal piece to form the outside air introduction hole.

Further, in the method for producing a container containing contents of the present invention, it is preferable that the liquid injection step includes a cooling step of injecting a cooling liquid into the synthetic resin blow-molded container.

Further, in the method for manufacturing a container containing contents of the present invention, it is preferable that the liquid injection step includes a sterilization step of injecting a sterilizing liquid into the synthetic resin blow-molded container.

According to the present invention, by performing the content filling and liquid injection step before separating the removal piece, the liquid injection step can be completed in a state before the outside air introduction hole is formed, so that shower water or the like can be completed. It is possible to prevent the liquid from entering the inside of the container.

Therefore, according to the present invention, it is possible to provide a blow-molded synthetic resin container capable of preventing the liquid from entering the inside of the container at the time of liquid injection after filling the contents, and a method for manufacturing the container containing the contents. it can.

It is a front view which shows the blow molding container made of synthetic resin which concerns on one Embodiment of this invention in a partial cross section. It is a side view of the blow molding container made of synthetic resin of FIG.

Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a front view of a synthetic resin blow-molded container 1 (hereinafter, referred to as “container 1”) according to an embodiment of the present invention, and FIG. 2 is a side view of the container 1. In the present specification, the vertical direction is a direction parallel to the central axis C of the container 1, the side where the mouth portion 10 is located is upward (for example, the upper side in FIG. 1), and the side where the removal piece 12 is located. Is downward (for example, lower in FIG. 1).

The container 1 is a volume-reducing and deformable inner layer formed of a synthetic resin outer layer 2 forming the outer shell of the container 1 and a synthetic resin having low compatibility with the outer layer 2 inside the outer layer 2. It is a stack of the body 3. The inside of the inner layer body 3 is a storage space S for accommodating the contents (not shown), and the inner layer body 3 is arranged in a laminated manner so as to be peelable from the outer layer body 2. An adhesive band that partially joins the outer layer 2 and the inner layer 3 to each other may be provided between the outer layer 2 and the inner layer 3. The adhesive band can be, for example, a vertical band extending parallel to the central axis C from the vicinity of the outer end portion of the removal piece 12 toward the mouth portion 10, but is not limited thereto.

The container 1 is provided with a tubular mouth portion 10, a body portion 11 connected to the mouth portion 10, and a pinch-off portion located at an end portion of the body portion 11 (the end portion opposite to the mouth portion 10). It has a piece 12 and. In the present embodiment, the mouth portion 10 is formed in a cylindrical shape, and a male screw 10a to which a discharge cap or the like can be attached is provided on the outer peripheral surface thereof. Further, the tip opening 10b of the mouth portion 10 serves as an outlet for the contents.

Here, the discharge cap attached to the mouth portion 10 is, for example, a mounting cylinder screwed to the outside of the mouth portion 10, a partition wall covering the upper portion of the mounting cylinder, and an upright opening above the partition wall. A discharge cylinder serving as a discharge port for an object and a lid body that closes the discharge port so as to be openable and closable can be provided. Further, in this case, while allowing the outflow of the contents from the accommodation space S to the discharge port between the accommodation space S and the discharge port, the inflow of the contents and air from the discharge port side to the accommodation space S is allowed. It is also possible to provide a check valve to prevent it. It should be noted that the mounting cylinder of the discharge cap may be configured to be undercut-engaged with the mouth portion 10.

The body portion 11 has one end connected to the mouth portion 10 and the other end closed. Further, in this example, the body portion 11 has a flat shape in which the width W shown in FIG. 1 is larger than the thickness T shown in FIG. 2, and the cross section perpendicular to the central axis C is substantially elliptical. .. Further, the body portion 11 has a tubular central region 11a having a constant cross-sectional shape, an upper region 11b connected to one side (mouth portion 10 side) of the central region 11a, and the other side (removal piece 12) of the central region 11a. It has a lower region 11c connected to the side). The upper region 11b is connected to the mouth portion 10 while gradually reducing the diameter from the connecting portion to the central region 11a toward the mouth portion 10, and the contour line of the upper region 11b in the front view shown in FIG. 1 is It is curved to draw an arc. The lower region 11c is gradually reduced in diameter from the connecting portion to the central region 11a downward, and the contour line of the lower region 11c in the front view shown in FIG. 1 is curved so as to draw a semicircle. And it is blocked. The body portion 11 of the container 1 has flexibility, and is configured so that the body portion 11 can be pressed and squeezed when the contents of the storage space S are discharged to the outside.

The removal piece 12 is partitioned by the planned fracture portion 13. In this example, the removal piece 12 is a plate-shaped projecting piece that is integrally connected to the lower region 11c of the body portion 11 via the planned fracture portion 13. Further, the removal piece 12 is provided at a pinch-off portion located at an end portion of the body portion 11 opposite to the mouth portion 10 (end portion on the lower region 11c side). In this example, the removal piece 12 extends linearly along the parting line PL of the mold. In the side view of the container 1 shown in FIG. 2, the parting line PL of the container 1 formed by the divided surface of the mold is shown overlapping the central axis C.

The planned break portion 13 is composed of a thin-walled portion formed to be thinner than the removal piece 12, and is easily broken. The planned fracture portion 13 extends along the contour line of the lower end portion of the body portion 11. By providing such a planned breakage portion 13, the removal piece 12 can be easily separated along the contour line of the lower end portion of the body portion 11. Then, by separating the removal piece 12, a slit-shaped opening (outside air introduction hole) penetrating the outer layer body 2 is formed at the position where the removal piece 12 is separated, that is, at the portion where the planned fracture portion 13 is formed. Will be done.

The outside air introduction hole is a hole that penetrates only the outer layer body 2 without penetrating the inner layer body 3, and allows the air outside the container 1 to pass through the outside air introduction hole to the inside between the outer layer body 2 and the inner layer body 3. It can be introduced into the space. With such a configuration, outside air can be introduced into the internal space between the outer layer 2 and the inner layer 3 as the contents are discharged, and as a result, only the inner layer 3 is reduced in volume and deformed. Can be made to. When a discharge cap with a check valve is provided in the mouth portion 10, it is possible to prevent outside air from flowing into the storage space S, and the contents remaining in the storage space S of the container 1 can be prevented. Deterioration and deterioration can be suppressed.

Here, the removal piece 12 is formed with at least one biting portion 14 that is made to bite from the side surface on one side toward the side surface on the other side. The bite portion 14 is a recess in which the thickness direction of the removal piece 12 is the bite direction.

The removal piece 12 of this example is provided with biting portions 14 at five positions, and is provided along the lower edge portion 12a of the removal piece 12 (the edge portion of the removal piece 12 opposite to the planned fracture portion 13). , Arranged in a staggered pattern. Further, the plurality of biting portions 14 are arranged so that the biting directions of the two adjacent biting portions 14 face each other. The shape, number, position, etc. of the biting portions 14 are not particularly limited and can be changed as appropriate. For example, a straight bite portion extending over the entire width of the removal piece 12 may be formed along the lower edge portion 12a of the removal piece 12.

The container 1 is extruded by extrusion blow molding (blow molding step) using a tubular parison formed by laminating a synthetic resin forming the outer layer 2 and a synthetic resin of the inner layer 3 having low compatibility with the outer layer 2. ) Can be obtained. Further, in the container 1 of the present embodiment, the outer layer 2 is made of polypropylene resin (PP) and the inner layer 3 is made of ethylene vinyl alcohol copolymer resin (EVOH). The above layer structure is an example, and as long as the inner layer 3 can be peeled off from the outer layer 2, the materials of the outer layer 2 and the inner layer 3 are not particularly limited, and each has a single layer structure. Alternatively, for example, the inner layer 3 may have a multilayer structure composed of a plurality of layers such as "EVOH / adhesive / olefin" and "nylon / adhesive / olefin".

Here, in the blow molding step, the removal piece 12 crushes a tubular parison in which the synthetic resin forming the outer layer 2 and the synthetic resin forming the inner layer 3 are laminated by a split mold, and the tip thereof is crushed. It is formed by cutting off. Further, the bite portion 14 is formed by pushing the protruding pin provided in the split mold into the removal piece 12 in the blow molding step. Here, when the removal piece 12 is not provided with the biting portion 14, the inner layer body 3 made of a material having low compatibility with the outer layer body 2 is likely to be peeled off from the outer layer body 2. Therefore, when the biting portion 14 is not provided, a gap is likely to be generated between the outer layer body 2 and the inner layer body 3 at the edge portion 12a on the tip end side of the removal piece 12, and a liquid such as shower water is likely to form from the gap between the outer layer bodies 2. There is a risk of invading the internal space of the container 1 (the space between the outer layer 2 and the inner layer 3).

Therefore, by providing the removal piece 12 with the biting portion 14 as in the present embodiment, the peeling of the inner layer 3 in the removal piece 12 is suppressed, and the internal space of the liquid container 1 such as shower water through the removal piece 12 is suppressed. It is possible to prevent invasion into.

Here, in the step of forming the outside air introduction hole, when the removal piece 12 is separated, it is preferable to cut the planned fracture portion 13 while pulling the removal piece 12 downward. As a result, it is possible to prevent a problem that the removal piece 12 or the planned fracture portion 13 remains in the body portion 11 after cutting and protrudes from the lower end portion of the body portion 11. That is, when the planned fracture portion 13 is cut in a state where the removed piece 12 and the planned fracture portion 13 are elastically deformed downward by pulling the removed piece 12 downward, the remaining portion of the removed piece 12 or the planned fracture portion 13 after cutting is removed. Due to the restoring force of the planned fracture portion 13, which has been elastically deformed downward, the container 1 is returned to the upper inside. As a result, it is possible to solve the problem that the removal piece 12 remaining on the body portion 11 or a part of the planned fracture portion 13 protrudes downward from the lower end of the body portion 11 and impairs the appearance.

The method of separating the removal piece 12 is not particularly limited, and for example, the planned breaking portion 13 may be cut using a cutting tool or the like, or the removal piece 12 may be manually picked and torn. .. When cutting the planned fracture portion 13 using a cutting tool or the like, a cutting machine or the like using a Thomson blade or the like can be selected.

When applying the filling step and the liquid injection step to the container 1, first, the contents such as liquid food are heated (heat-filled) in the storage space S of the inner layer 3 in a state where the contents are heated to a high temperature as necessary. , Screw the discharge cap with the lid closed. Then, in the subsequent liquid injection step, the liquid is injected into the container 1. The liquid injection step includes, for example, a sterilization step of injecting high-temperature shower water for sterilization to sterilize the container 1 and a cooling step of injecting low-temperature shower water for cooling to cool the container 1 and its contents. .. The liquid injection step may include only one of the sterilization step and the cooling step, or may include both. When the liquid injection step includes a sterilization step, it is not necessary to heat-fill the contents in the filling step. When performing such a liquid injection step, since the outside air introduction hole is not formed in the state where the removal piece 12 of the container 1 is not separated, the liquid enters the inside of the container 1 from the outside air introduction hole as in the conventional case. There is no such thing.

Further, as described above, by forming the biting portion 14 on the removing piece 12 to prevent the outer layer 2 and the inner layer 3 from peeling off, it is possible to prevent the removing piece 12 from forming a gap communicating with the internal space. can do. This makes it possible to more reliably prevent the liquid from entering the internal space of the container 1 in the liquid injection step.

As described above, the method for manufacturing a container containing contents using the container 1 includes a blow molding step of blow molding using a tubular parison and a content in a storage space S of the container 1 formed by the blow molding step. Includes a filling step of filling the container 1, a liquid injection step of injecting a liquid into the container 1 after the filling step, and an outside air introduction hole forming step of separating the removal piece 12 to form an outside air introduction hole after the liquid injection step.

When discharging the contents from the container containing the contents, the contents are smoothly discharged by tilting or tilting the container 1 with the lid of the discharge cap open and squeezing the body portion 11. be able to. Further, when the squeeze is released, only the outer layer 2 is restored while the inner layer 3 remains volume-reduced and deformed, and along with this, the outside air is introduced into the internal space between the outer layer 2 and the inner layer 3 through the outside air introduction hole. The Rukoto.

As described above, the synthetic resin blow-molded container 1 according to the present embodiment has a configuration in which an outside air introduction hole is formed by separating the removal piece 12 from the body portion 11, and the removal piece 12 has a bite portion 14 Is provided. Therefore, according to the container 1 according to the present embodiment, the liquid injection step can be completed before the outside air introduction hole forming step of separating the removal piece 12 to form the outside air introduction hole, so that the inside of the liquid container 1 can be completed. Can be prevented from entering. Further, by providing the biting portion 14, it is possible to suppress the infiltration of the liquid into the inside of the container 1 through the removal piece 12. Further, after the liquid injection step, the removal piece 12 is separated to form the outside air introduction hole in the outside air introduction hole forming step, so that when the contents are discharged from the container containing the contents, the outer layer body 2 and the inner layer body 3 are combined. It is possible to introduce outside air into the internal space between them.

In the present embodiment, by arranging the biting portion 14 along the lower edge portion 12a of the removal piece 12, the intrusion of the liquid into the internal space of the container 1 in the liquid injection step is more reliably prevented. Can be done. That is, in the vicinity of the lower edge portion 12a of the removal piece 12 that is cut off by the split mold in extrusion blow molding, the inner layer body 3 is easily peeled off from the outer layer body 2. Therefore, by providing the biting portion 14 along the edge portion 12a, it is possible to effectively prevent the inner layer body 3 from peeling off from the outer layer body 2 to form a gap, and more reliably prevent the infiltration of liquid. can do. Further, by arranging the plurality of biting portions 14 in a staggered manner, it is possible to enhance the effect of preventing the outer layer body 2 and the inner layer body 3 from peeling off in the removal piece 12.

Further, in the present embodiment, the two adjacent biting portions 14 are arranged so that the biting directions are opposed to each other, so that the effect of preventing the outer layer 2 and the inner layer 3 from peeling off in the removal piece 12 can be obtained. It can be further enhanced.

Further, in this example, since the planned fracture portion 13 is a thin portion, the planned fracture portion 13 is crushed by the mold more strongly than the removal piece 12 during blow molding. Therefore, in the planned fracture portion 13, the outer layer body 2 and the inner layer body 3 are strongly pressure-bonded to prevent peeling, and the infiltration of liquid can be prevented more reliably.

The above is merely an embodiment of the present invention, and various modifications can be made within the scope of the claims. For example, in the above embodiment, the body portion 11 has a flat shape having a substantially elliptical cross section, but the shape of the body portion 11 can be changed as appropriate. For example, the body portion 11 may have a cylindrical shape or a polygonal tubular shape. Further, the lower region 11c of the body portion 11 is not limited to a shape whose diameter is reduced toward the lower end, and the lower end portion of the tubular body portion 11 having a substantially constant diameter is substantially perpendicular to the central axis C. It may have a bottomed tubular structure closed by an extending bottom plate.

1: Synthetic resin blow-molded container 2: Outer layer body 3: Inner layer body 10: Mouth part 11: Body part 11a: Central area 11b: Upper area 11c: Lower area 12: Removal piece 12a: Edge part 13: Expected fracture part 14: Biting part C: Central axis S: Accommodation space

Claims (8)

A synthetic resin blow-molded container including an outer layer body forming the outer shell of the container and an inner layer body provided inside the outer layer body.
It has a body portion in which one end is connected to a tubular mouth portion and the other end is closed, and a pinch-off portion located at the other end of the body portion.
The pinch-off portion is provided with a removal piece partitioned by the planned fracture portion.
By separating the removed piece along the planned fracture portion, an outside air introduction hole capable of introducing outside air is formed between the outer layer body and the inner layer body.
A synthetic resin blow-molded container characterized in that the removed piece is formed with at least one biting portion formed from one side surface of the removed piece toward the other side surface. The synthetic resin blow-molded container according to claim 1, wherein a plurality of the biting portions having biting directions facing each other are formed on the removing piece. The synthetic resin blow-molded container according to claim 2, wherein the plurality of the biting portions are arranged so that the biting directions of the two adjacent biting portions face each other. The synthetic resin blow-molded container according to claim 2 or 3, wherein the plurality of biting portions are arranged in a staggered manner along an edge portion of the removed piece opposite to the planned fracture portion. The synthetic resin blow-molded container according to any one of claims 1 to 4, wherein the fractured portion is composed of a thin-walled portion formed to be thinner than the removed piece. A method for manufacturing a container containing contents using the synthetic resin blow-molded container according to any one of claims 1 to 5.
A blow molding step of blow molding using a tubular parison in which the synthetic resin forming the outer layer body and the synthetic resin forming the inner layer body are laminated.
A filling step of filling the storage space of the synthetic resin blow molding container formed by the blow molding step with the contents, and a filling step of filling the contents.
After the filling step, a liquid injection step of injecting a liquid into the synthetic resin blow-molded container, and a liquid injection step.
A method for manufacturing a container containing contents, which comprises an outside air introduction hole forming step of separating the removal piece to form the outside air introduction hole after the liquid injection step. The method for manufacturing a container containing contents according to claim 6, wherein the liquid injection step includes a cooling step of injecting a cooling liquid into the synthetic resin blow-molded container. The method for producing a container containing contents according to claim 6 or 7, wherein the liquid injection step includes a sterilization step of injecting a sterilizing liquid into the synthetic resin blow-molded container.

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