JP2018108826A - Double container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double container which makes cracks less likely to occur in a pinch off part.SOLUTION: A double container 1 includes: an outer layer body 10 forming a bottle shape having a mouth part 11, a trunk part 12, and a bottom part 13 and forming an outer shell of the container; an inner layer body 20 which is housed in the outer layer body 10 and enables volume-reducing deformation; and a pinch off part 30 which is formed at the bottom part 13 and has a projection shape. The pinch off part 30 has a wave form in a bottom view.SELECTED DRAWING: Figure 2

Description

  The present invention has a bottle shape having a mouth portion, a body portion, and a bottom portion, and is formed at the bottom portion, an outer layer body that forms an outer shell of a container, an inner layer body that can be stored inside the outer layer body, and can be deformed and reduced in volume. It is related with a double container provided with a pinch-off part of a ridge shape.

  As a container for storing cosmetics such as lotion, liquid contents such as shampoo, rinse, liquid soap, or food seasoning, it has a bottle shape with a mouth, body and bottom, and the outer shell of the container And an inner layer body that can be volume-reduced and deformed that can be accommodated inside the outer layer body, and the inner layer body is reduced in volume and deformed, and the contents are poured out from the air introduction hole provided in the outer layer body. There is known a double container in which the outer shape of the outer layer body can be restored to the original shape while reducing the volume of the inner layer body by introducing air between the inner layer body and the outer layer body. (For example, refer to Patent Document 1). This type of container can pour out the contents without replacing it with air, thus reducing the contact of the contents with the air in the container and suppressing the deterioration and alteration of the contents. Can do.

JP 2013-151316 A

  As such a double container, there is known a delamination container called a delamination container formed by extrusion blow molding a laminated parison using a mold. In this case, the double container is formed by coextruding the outer layer synthetic resin and the inner layer synthetic resin, which have low compatibility, into a cylindrical laminated parison, and this laminated parison is blown using a left and right split mold. By forming, the inner layer body is formed on the inner surface of the outer layer body. At this time, the cylindrical laminated parison is crushed by the mold and its tip is cut off to close the opening, so that a protrusion-shaped pinch-off portion is provided at the bottom of the double container. Become.

  On the other hand, in the double container, the air between the outer layer body and the inner layer body is released from the air introduction hole when the trunk portion is squeezed by the check valve function provided in the pouring cap or the like attached to the mouth portion. The inner layer is prevented from leaking to the outside, and the inner body is pressed against the body part indirectly through the air so that the contents are poured out, and the air introduction hole is released when the squeeze of the body part is released. Is opened so that outside air is introduced between the outer layer body and the inner layer body, and only the outer layer body is restored to its original shape while the inner layer body is volume-reduced and deformed.

  Thus, in the double container, when the body portion of the outer layer body is squeezed to pour out the contents, the outer layer body and the inner layer body are prevented from leaking to the outside between the outer layer body and the inner layer body. Need to hold between. Therefore, if the container falls or the like, and an impact is applied to the pinch-off part provided at the bottom of the container and a crack occurs in the pinch-off part, the body part of the outer layer body is squeezed to pour out the contents. However, the air between the outer layer body and the inner layer body leaks to the outside from the pinch-off part, and the problem arises that the internal pressure of the air does not increase and the contents cannot be poured out.

  Conventionally, since a relatively soft resin material (low density polyethylene or the like) was used as a material constituting the outer layer body, it was difficult for a pinch-off portion to be cracked due to an impact or the like. However, when a relatively hard resin material such as polypropylene is used for the outer layer body in order to ensure the heat resistance of the container, the pinch-off portion will crack when an impact is applied, and the contents are poured. There was a risk that it would be difficult to remove.

  An object of the present invention is to solve such problems, and an object of the present invention is to provide a double container in which cracks are unlikely to occur in a pinch-off portion.

  The double container of the present invention has a bottle shape having a mouth part, a body part, and a bottom part, an outer layer body that forms an outer shell of the container, and an inner layer body that can be volume-reduced and deformed that is housed inside the outer layer body, It is a double container provided with the protrusion-shaped pinch-off part formed in the said bottom part, Comprising: The said pinch-off part is a wave form in bottom view, It is characterized by the above-mentioned.

  In the double container according to the present invention, in the above configuration, the pinch-off portion preferably has a substantially sinusoidal shape in a bottom view.

  In the double container of the present invention, in the above configuration, the pinch-off portion preferably has a substantially sinusoidal shape for one cycle when viewed from the bottom.

  In the double container according to the present invention, in the above configuration, it is preferable that at least one adhesive band layer extending from the mouth portion to the bottom portion is provided between the outer layer body and the inner layer body.

  In the double container of the present invention, in the above configuration, the outer layer body preferably includes a polypropylene layer.

  The double container of the present invention has the above-described configuration, wherein the outer layer body has a layer configuration of a low density polyethylene layer / recycled material layer / polypropylene layer from the outside toward the inside, and the inner layer body has the layer structure from the outside to the inside. For this, it is preferable to have a layer structure of EVOH layer / adhesive layer / low density polyethylene layer.

  The double container according to the present invention has the above-described configuration, wherein the pinch-off portion has a base portion extending along the bottom portion, a first vertical wall portion extending downward from the base portion, and the first vertical wall at one side end. A first horizontal wall portion that extends integrally from the lower end of the first vertical wall portion, and a first horizontal wall portion that extends horizontally from the lower end of the first vertical wall portion; A second vertical wall portion extending downward from the end, and one side end integrally connected to a lower end of the second vertical wall portion, and extends horizontally from the lower end of the second vertical wall portion to face the first horizontal wall portion. It is preferable to have the 2nd horizontal wall part arrange | positioned.

  ADVANTAGE OF THE INVENTION According to this invention, the double container which a crack is hard to produce in a pinch-off part can be provided.

It is a front view which partially cuts and shows the double container which concerns on one embodiment of this invention. It is a bottom view of the double container shown in FIG. It is an enlarged front view which expands and shows the bottom part of the double container shown in FIG. It is an enlarged side view which expands and shows the bottom part of the double container shown in FIG. It is sectional drawing which follows the AA line in FIG. It is explanatory drawing which shows a mode that an adhesive belt layer shift | deviates at the time of the cutting-off of the laminated parison by a metal mold | die. It is sectional drawing of the modification of the pinch-off part shown in FIG. It is an enlarged front view of the bottom part of the double container provided with the pinch-off part of the modification shown in FIG.

  Hereinafter, the double container 1 according to an embodiment of the present invention will be described in detail with reference to the drawings.

  In addition, in this specification and a claim, the up-down direction shall mean the upper direction and the downward direction in the state which made the double container 1 the erect posture as shown in FIG. The radial direction means a direction along a straight line passing through the central axis of the double container 1 and perpendicular to the central axis.

  As shown in FIG. 1, a double container 1 according to an embodiment of the present invention includes an outer layer body 10 that constitutes an outer shell of the container, and an inner layer body 20 that is housed inside the outer layer body 10. It has a double structure.

  The outer layer body 10 has a substantially cylindrical mouth portion 11, a substantially cylindrical body portion 12 that is continuous with the lower end of the mouth portion 11, and a bottom portion 13 that is continuous with the lower end of the body portion 12 and closes the body portion 12. It has a shape. In the case shown in the figure, the body portion 12 is formed to have a larger diameter than the mouth portion 11, and a shoulder portion 14 having an enlarged diameter is formed between the mouth portion 11 and the body portion 12. The trunk portion 12 has flexibility, and can be elastically deformed into a recessed state by being squeezed (pressed) radially inward, and is elastic from the recessed state to the original shape. Can be restored with force. An air introduction hole 11 a is provided in the mouth portion 11 of the outer layer body 10. The air introduction hole 11 a communicates between the outer layer body 10 and the inner layer body 20, and can introduce outside air between the outer layer body 10 and the inner layer body 20.

  The outer layer body 10 can be made of various resin materials such as polyethylene (PE), polyethylene terephthalate (PET), and polypropylene (PP). Moreover, the outer layer body 10 can also be made into the laminated structure which laminated | stacked the several layer from which a material differs. In the present embodiment, the outer layer body 10 has a laminated structure including a polypropylene layer in order to increase the heat resistance of the double container 1. More specifically, the outer layer body 10 has a laminated structure having a layer structure in which a low density polyethylene layer / recycled material layer / polypropylene layer are laminated in order from the outside to the inside of the double container 1. The recycled material layer is a layer composed of a recycled resin such as a member (end material or the like) that is no longer required when the double container 1 is molded, or a recycled and pulverized member. In this embodiment, the thickness of the low density polyethylene layer is 10 μm, the thickness of the recycled material layer is 600 to 800 μm, and the thickness of the polypropylene layer is 20 μm. The layer configuration of the outer layer body 10 is not limited to the above, and various changes including the layer thickness can be made according to the use of the double container 1 and the like. For example, the low density polyethylene layer can be changed to a polypropylene layer, a high density polyethylene layer, a medium density polyethylene layer, a linear low density polyethylene layer, or the like. Further, the polypropylene layer can be changed to a high density polyethylene layer, a medium density polyethylene layer, a linear low density polyethylene layer, or the like.

  The inner layer body 20 is formed in a bag shape that is thinner and more flexible than the outer layer body 10, and is in close contact with the inner surface of the outer layer body 10 at the outer surface thereof. The opening portion of the inner layer body 20 is connected to the opening end of the mouth portion 11 of the outer layer body 10, and the inside thereof is a housing space S that is continuous to the opening portion. In the storage space S, for example, cosmetics such as lotion, liquid contents such as shampoo and rinse, liquid soap, or food seasonings can be stored. The inner layer body 20 can be reduced in volume and can be deformed so as to reduce the inner volume while being peeled off from the outer layer body 10 as the contents are poured out from the housing space S.

  The inner layer body 20 can be made of a flexible resin material such as EVOH (ethylene-vinyl alcohol copolymer) resin or nylon. Moreover, the inner layer body 20 can also be made into the laminated structure which laminated | stacked the several layer from which a material differs. In the present embodiment, the inner layer body 20 has a laminated structure in which the EVOH layer / adhesive layer / low-density polyethylene layer are laminated in order from the outside to the inside of the double container 1. As the adhesive layer, for example, a modified polyolefin resin (“Admer” (registered trademark)) can be used. In the present embodiment, the EVOH layer has a thickness of 15 μm, the adhesive layer has a thickness of 10 μm, and the low-density polyethylene layer has a thickness of 50 μm. In addition, the layer structure of the inner layer body 20 is not limited to the above, and can be variously changed including the layer thickness according to the use of the double container 1 or the like. For example, the EVOH layer can be changed to a layer made of an EVOH resin to which other components are added to enhance flexibility. Moreover, the ethylene content which is a copolymerization component of EVOH can be changed according to the desired barrier property. The low density polyethylene layer can be changed to a polypropylene layer, a high density polyethylene layer, a medium density polyethylene layer, a linear low density polyethylene layer, an EVOH layer, or the like.

  In the present embodiment, the double container 1 forms a cylindrical laminated parison by co-extrusion of the synthetic resin layer for the outer layer body 10 and the synthetic resin layer for the inner layer body 20 having the above layer structure. Lamination peeling, also called a delamination container, is formed by a blow molding (extrusion blow molding) of a parison using a left and right split mold so that the inner layer body 20 is peelably adhered to the inner surface of the outer layer body 10. It is configured as a container. By performing blow molding using a left and right divided mold, a parting line 15 extending along the divided surface of the mold is formed on the side surface of the outer layer body 10. The parting line 15 extends from the mouth portion 11 to the bottom portion 13 through the trunk portion 12 on the side surface of the outer layer body 10.

  The bottom portion 13 of the double container 1 is provided with a pinch-off portion 30 having a ridge shape by a cylindrical laminated parison being crushed by a mold and cut off to close the opening. The detailed structure of the pinch-off unit 30 will be described later.

  At the mouth portion 11 of the double container 1, for example, an extraction tool (not shown) such as an extraction cap, various nozzles or an extraction pump in which an extraction valve and a check valve for the air introduction hole 11 a are arranged. ) Is installed. The dispensing tool can be mounted by undercut engagement with a stopper, for example, but can also be configured by screw connection. The double container 1 is provided with a pouring cap in which a pouring valve is disposed in the mouth portion 11, thereby squeezing the body portion 12 of the outer layer body 10, thereby pouring the contents from the mouth portion 11. Can be issued. When the outer layer body 10 is restored to its original shape after the contents are poured out, air (outside air) flows between the outer layer body 10 and the inner layer body 20 from the air introduction hole 11a provided in the mouth portion 11. Only the outer layer body 10 can be restored to its original shape while the inner layer body 20 is deformed and reduced in volume. Accordingly, when the contents are poured out, the air is prevented from flowing into the accommodation space S of the inner layer body 20 from the mouth portion 11, and the contents accommodated in the accommodation space S are difficult to touch the air. Deterioration can be prevented. When the body portion 12 is squeezed to pour out the contents again, the check valve for the air introduction hole 11a prevents the air between the outer layer body 10 and the inner layer body 20 from leaking outside. The inner layer body 20 can be pressed by the body portion 12 through the air therebetween. In addition, it can also be set as the structure which pours out the content accommodated in the accommodation space S of the inner layer body 20 from the mouth part 11 with dead weight by inclining the outer layer body 10. FIG. Furthermore, when a pouring tool equipped with a pump is attached to the mouth portion 11, a non-flexible outer layer body 10 can be used.

  As shown in FIGS. 1 to 5, the bottom portion 13 has an annular outer edge portion 13a that serves as a ground contact surface, and a concave portion 13b that curves upward in a dome shape on the inner peripheral side of the outer edge portion 13a. The pinch-off part 30 described above is provided in this part. The pinch-off portion 30 passes through the center of the recess 13b, and both ends thereof reach the vicinity of the outer edge portion 13a and are connected to the parting line 15, and as shown in FIG. It has a ridge shape with a height that does not protrude below 13a.

  The pinch-off portion 30 has a wave shape in the bottom view shown in FIG. In the present embodiment, the pinch-off portion 30 is formed in a substantially sinusoidal shape (S-shape) for one cycle when viewed from the bottom. More specifically, the pinch-off portion 30 is shifted by 90 degrees with respect to the first straight portion 30a at both ends of the first straight portion 30a that extends along the radial direction of the bottom portion 13 through the center of the bottom portion 13, respectively. The second linear portion 30b extending in the direction has a shape in which the second linear portions 30b are connected in opposite directions via the curved portion 30c, and is point-symmetric with respect to the center of the bottom portion 13. As shown in FIG. 5, the pinch-off portion 30 has a horizontally long cross-sectional shape, and a protrusion 36 having a triangular cross-section is integrally provided on the lower surface thereof along the center thereof. Since the pinch-off portion 30 has the above-described wave shape, when a load or impact in a direction parallel to the parting line 15 in the bottom portion 13 is applied to the bottom portion 13, the first straight portion 30a and the second straight portion 30b. Can be easily elastically deformed in the form of a spring so as to reduce the radial dimension by narrowing the distance between and.

  Although not shown in detail in FIG. 5, the outer layer body 10 and the inner layer body 20 are also laminated in the concave portion 13 b and the pinch-off portion 30 of the bottom portion 13.

  As described above, in the double container 1 according to the present embodiment, since the pinch-off portion 30 has the above-described wave shape, the outer layer body 10 is configured to include a relatively hard polypropylene layer as in the present embodiment. Even when a large impact or the like is applied to the pinch-off portion 30 such as when the double container 1 is dropped while the contents are accommodated therein, the impact is caused by the elastic deformation of the pinch-off portion 30. It can absorb and can prevent that the pinch-off part 30 is cracked.

  In particular, when a load or impact in a direction parallel to the parting line 15 in the bottom portion 13 is applied to the bottom portion 13, the pinch-off portion 30 narrows the distance between the first straight portion 30 a and the second straight portion 30 b. By elastically deforming into a radial spring shape, the load or impact can be effectively absorbed, and the pinch-off portion 30 can be reliably prevented from cracking.

  The double container 1 may be configured such that an adhesive band layer 40 that joins the outer layer body 10 and the inner layer body 20 to each other is provided between the outer layer body 10 and the inner layer body 20. In this case, the adhesive band layer 40 can be made of, for example, a modified polyolefin resin (“Admer” (registered trademark)). In the present embodiment, the thickness of the adhesive band layer 40 is 10 μm.

  As shown in FIGS. 2 and 4, in the present embodiment, two adhesive band layers 40 extending from the mouth portion 11 to the bottom portion 13 and reaching the pinch-off portion 30 are provided on both sides of the double container 1. I am doing so. By providing such an adhesive band layer 40, when the contents are poured out, the inner layer body 20 is reduced in volume and deformed into a flat shape, and the inner layer body 20 is distorted and deformed, whereby the inner layer body 20 is deformed. It is possible to prevent the contents from remaining without being poured into the interior.

  In the present embodiment, when the pinch-off portion 30 is formed in a substantially sine wave shape for one cycle when viewed from the bottom, a left-right split mold that forms a pinch-off portion 30 by cutting through a cylindrical laminated parison For example, a shape in which the division shape at the bottom portion 13 is a substantially sine wave shape corresponding to one period corresponding to the pinch-off portion 30 is used. When the cylindrical laminated parison is devised using such a mold, the laminated parison 50 corresponds to the first straight portion 30a inclined with respect to the sandwiching direction of the mold, as shown in FIG. The portion is sandwiched while being rotated about its axis. As a result, the laminated parison 50 is twisted around the axis from the mouth side toward the bottom side in the mold. Therefore, in the present embodiment, the pair of adhesive band layers 40 provided on both sides of the double container 1 are provided along the parting line 15 on both sides of the parting line 15 in the mouth portion 11. Although it is arranged, it extends downward while being twisted to one side in the circumferential direction, and at the bottom portion 13, both adhesive band layers 40 are located on one side in the circumferential direction with respect to the parting line 15. It is configured. Each adhesive band layer 40 is connected to the vicinity of the side end portion facing the radially outer side of the second straight portion 30 b of the pinch-off portion 30.

  Thus, when the pinch-off part 30 is formed in a substantially sine wave shape for one cycle in a bottom view, the side surface of the adhesive band layer 40 facing the radially outer side of the second straight part 30b of the pinch-off part 30 Since the bonding area between the outer layer body 10 and the inner layer body 20 in the portion can be widened, the second straight portion 30b of the pinch-off portion 30 that is susceptible to an impact when the double container 1 is dropped or the like. It is possible to increase the strength in the vicinity of the end portion of the side surface facing the outer side in the radial direction, and to reliably prevent the occurrence of cracks from the vicinity of the end portion of the pinch-off portion 30.

  7 is a cross-sectional view of a modified example of the pinch-off portion shown in FIG. 5, and FIG. 8 is an enlarged front view of the bottom of the double container provided with the pinch-off portion of the modified example shown in FIG. In FIGS. 7 and 8, members corresponding to those described above are denoted by the same reference numerals.

  In the case shown in FIG. 5, the cross-sectional shape of the pinch-off portion 30 is a vertically long rectangular shape, but the cross-sectional shape of the pinch-off portion 30 is a folded shape (crank shape) as in the modified examples shown in FIGS. 7 and 8. ).

  That is, in this modification, the pinch-off portion 30 includes a base portion 31 having a substantially rectangular cross section extending along the recess portion 13b, a first vertical wall portion 32 extending downward from the base portion 31, and a first at one end. The first horizontal wall portion 33 that is integrally connected to the lower end of the vertical wall portion 32, extends horizontally (in the radial direction) from the lower end of the first vertical wall portion 32, and is integrally connected to the other side end of the first horizontal wall portion 33 at the upper end, A second vertical wall portion 34 extending downward from the other side end of the first horizontal wall portion 33, and one side end integrally connected to the lower end of the second vertical wall portion 34 and horizontally extending from the lower end of the second vertical wall portion 34. And a second horizontal wall portion 35 disposed to face the first horizontal wall portion 33. Since the pinch-off part 30 has the above-described folded shape, the wall parts 32 to 35 can be easily elastically deformed so that the angle formed between the wall part 32 and the other wall parts 32 to 35 increases or decreases. Can do.

  The first vertical wall portion 32 and the second vertical wall portion 34 are substantially parallel to each other, and the first horizontal wall portion 33 and the second horizontal wall portion 35 are substantially parallel to each other. Moreover, the thickness of the 1st vertical wall part 32 and the 2nd vertical wall part 34 is substantially the same, and the thickness of the 1st horizontal wall part 33 and the 2nd horizontal wall part 35 is mutually substantially the same. Moreover, the thickness of the 1st vertical wall part 32 and the 2nd vertical wall part 34 is thinner than the thickness of the 1st horizontal wall part 33 and the 2nd horizontal wall part 35. As shown in FIG. With such a configuration, the pinch-off portion 30 has a space between the base portion 31 and the first horizontal wall portion 33 because the first vertical wall portion 32 and the second vertical wall portion 34 that are thinly formed are more easily elastically deformed. And it can be elastically deformed more easily in the vertical direction so as to narrow the distance between the first horizontal wall portion 33 and the second horizontal wall portion 35.

  Moreover, since the recessed part 13b becomes a shape which curves in the dome shape upwards, the base part 31, the 1st vertical wall part 32, the 1st horizontal wall part 33, the 2nd as the pinch-off part 30 goes to the both end sides. Although the vertical wall portion 34 and the second horizontal wall portion 35 are gradually integrated into the recess 13b in this order, in the present embodiment, as shown in FIG. 8, the base portion 31, the first vertical wall portion 32, the first The horizontal wall part 33, the second vertical wall part 34, and the second horizontal wall part 35 are each configured to be slightly curved so that the center side is on the upper side with a smaller curvature than the concave part 13b. Thereby, the range which becomes the above-mentioned folding shape of the pinch-off part 30 can be widened.

  As described above, since the pinch-off portion 30 of the modified example has the above-described folded shape, even if the outer layer body 10 includes a relatively hard polypropylene layer as in the present embodiment, the double container When a large impact or the like is applied to the pinch-off portion 30 due to, for example, dropping while the contents are accommodated therein, the impact is absorbed by the elastic deformation of the pinch-off portion 30 and cracked into the pinch-off portion 30 Can be prevented from occurring.

  In particular, when a load directed upward from the center position of the bottom portion 13 is applied to the pinch-off portion 30, the pinch-off portion 30 has an interval between the base portion 31 and the first lateral wall portion 33 and the first lateral wall portion 33 and the second lateral wall portion 33. By elastically deforming in the vertical direction so as to narrow the gap with the horizontal wall portion 35, the load can be effectively absorbed, and the pinch-off portion 30 can be reliably prevented from cracking. In this case, the pinch-off portion 30 is more elastic in the vertical direction by making the first vertical wall portion 32 and the second vertical wall portion 34 thinner than the first horizontal wall portion 33 and the second horizontal wall portion 35. It can be easily deformed to prevent the pinch-off portion 30 from cracking more reliably.

  Moreover, in the double container 1 of this Embodiment, with respect to the recessed part 13b which curves in the upward dome shape, the base part 31, the 1st vertical wall part 32, the 1st horizontal wall part 33, and 2nd which comprise the pinch-off part 30 are demonstrated. The vertical wall portion 34 and the second horizontal wall portion 35 have a smaller curvature than the concave portion 13b and slightly curved so that the center side is on the upper side, so that the range in which the pinch-off portion 30 is folded as described above is widened. Therefore, it is possible to effectively elastically deform the pinch-off portion 30 against a load or impact applied to various portions of the bottom portion 13 from various directions and absorb the load or impact.

  Further, when the outer layer body 10 and the inner layer body 20 are stacked in the concave portion 13b of the bottom portion 13 and the pinch-off portion 30 as in the double container 1 of the present embodiment, a plurality of stages of the pinch-off portion 30 are provided. The outer layer body 10 and the inner layer body 20 are securely adhered to each other by bending, and the outer layer body 10 and the inner layer body 20 are separated from each other and communicated between the outer layer body 10 and the inner layer body 20 at the pinch-off portion 30. It is also possible to prevent a gap from occurring.

  Even in the configuration of the modified example, when a load or an impact in a direction parallel to the parting line 15 in the bottom portion 13 is applied to the bottom portion 13, the pinch-off portion 30 has the first straight portion 30 a and the second straight portion 30 b. It can be elastically deformed in the shape of a radial spring so as to narrow the distance between and effectively absorb the load or impact, and can reliably prevent the pinch-off portion 30 from cracking.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, in the above-described embodiment, the pinch-off unit 30 has a substantially sine wave shape for one cycle. It can also be formed in the shape of In addition, when the pinch-off part 30 is made into the substantially sine wave shape for several periods, since the said laminated parison is not rotated when the laminated parison is bitten by a metal mold | die, a pair of adhesive belt layers 40 are the opening parts 11 respectively. The parting line 15 is arranged along the parting line 15 with the parting line 15 sandwiched from the base part 13 to the bottom part 13.

  Moreover, in the said embodiment, although the double container 1 shall be formed by extrusion blow molding, it is not restricted to this, For example, the preform of the laminated structure previously formed by injection molding etc. is biaxially stretch blown. It is good also as what is formed by shape | molding. The double container 1 may be formed by separately forming the outer layer body 10 and the inner layer body 20 and then incorporating the inner layer body 20 into the outer layer body 10.

  Furthermore, in the said embodiment, although the air introduction hole 11a is provided in the opening part 11, you may provide the air introduction hole 11a in parts other than the opening part 11, such as the trunk | drum 12, for example, The number and shape can be variously changed.

  Furthermore, in the said embodiment, although a pair of adhesive belt layer 40 is each provided in the both sides of the double container 1, the adhesive belt layer 40 should just be provided at least 1 piece.

DESCRIPTION OF SYMBOLS 1 Double container 10 Outer layer body 11 Mouth part 11a Air introduction hole 12 Body part 13 Bottom part 13a Outer edge part 13b Recessed part 14 Shoulder part 15 Parting line 20 Inner layer body 30 Pinch-off part 30a 1st linear part 30b 2nd linear part 30c Curved part 31 Base part 32 1st vertical wall part 33 1st horizontal wall part 34 2nd vertical wall part 35 2nd horizontal wall part 36 Protrusion 40 Adhesive belt layer 50 Laminated parison S Storage space

Claims (7)

An outer layer body that forms a bottle shape having a mouth part, a body part, and a bottom part, forms an outer shell of the container, an inner layer body that can be reduced in volume that is housed inside the outer layer body, and a ridge formed on the bottom part A double container comprising a pinch-off portion of shape,
The double container, wherein the pinch-off part has a wave shape in a bottom view.   The double container according to claim 1, wherein the pinch-off portion has a substantially sinusoidal shape in a bottom view.   The double container according to claim 2, wherein the pinch-off portion has a substantially sinusoidal shape for one cycle in a bottom view.   The double container according to any one of claims 1 to 3, wherein at least one adhesive band layer extending from the mouth portion to the bottom portion is provided between the outer layer body and the inner layer body. .   The double container according to any one of claims 1 to 4, wherein the outer layer body includes a polypropylene layer. The outer layer body has a layer configuration of low density polyethylene layer / recycled material layer / polypropylene layer from the outside to the inside,
The double container according to claim 5, wherein the inner layer body has a layer configuration of EVOH layer / adhesive layer / low-density polyethylene layer from the outside toward the inside. The pinch-off part is
A base portion extending along the bottom,
A first vertical wall portion extending downward from the base portion;
A first lateral wall portion integrally connected to a lower end of the first vertical wall portion at one side end and extending horizontally from a lower end of the first vertical wall portion;
A second vertical wall portion integrally connected to the other side end of the first horizontal wall portion at the upper end and extending downward from the other side end of the first horizontal wall portion;
A second lateral wall portion that is integrally connected to the lower end of the second vertical wall portion at one side end, extends horizontally from the lower end of the second vertical wall portion, and is disposed to face the first lateral wall portion; The double container according to any one of claims 1 to 6.

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