JP2004231270A - Synthetic resin container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a delamination container, for which a method for sealing a bottom off from the outside surely and easily at low cost is employed, and which requires less costs and has superior operability. <P>SOLUTION: A container body is blow molded from a cylindrical parison, and is composed of an outer layer and an inner layer laminated peelably on the outer layer to form an inner bag whose capacity is reducible. The container body has a cylindrical bottom part with a bottom face, on which a bottom seal part, which is crushed flat by a pinch-off part of a blow-split die and is formed along a parting line, is formed, and an air inlet for guiding in air between the outer layer and inner layer is formed on the outer layer. A cylindrical bottom cover with a bottom is fitted from below at the outside of the bottom part. Further, a cylindrical body made of a heat shrinkable synthetic resin is fitted airtightly at the outside of the part that covers from the trunk lower end of the container body to the cylindrical part of the bottom cover. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a blow-molded synthetic resin container in which an inner layer forming a deformable inner bag is formed in an outer layer forming an outer shell in a releasable manner, that is, a so-called delami container.
[0002]
[Prior art]
A blow molded container generally called a delami container is known in which an inner layer forming a deformable inner bag is releasably laminated within an outer layer forming an outer shell. An outer layer and an inner layer having almost no compatibility are extruded into a multi-layer parison by co-extrusion, and the multi-layer parison is obtained by blow molding.
[0003]
The outer layer of the Delami container has an air inlet formed between the outer layer and the inner layer to allow the outside air to enter.It can be used by attaching a cap that combines a dispenser pump, or the outer layer can be squeezed and restored It is used as a squeeze type delami container by forming a flexible outer shell, arranging a check valve in the intake hole, and screwing a cap having an opening in which the check valve is arranged.
[0004]
The bottom seal part of the bottom part squeezed and formed by the pinch-off part of the blow mold basically has a laminated structure of the outer layer part and the inner layer part with almost no compatibility, so bottom cracks easily occur in the outer layer part Therefore, research and development for securing the mechanical strength of the bottom portion of the delami container have been conventionally performed.
[0005]
In Patent Document 1, a bottom seal portion formed by being crushed flat by a pinch-off portion of a blow mold is formed into a ridge shape along a parting line by polymerizing and pressing a pair of rib pieces. There is a description of a technology in which a plurality of bite portions that bite from one side of a pair of rib pieces to the other are provided in a strip.
[0006]
In this conventional technique, the bottom seal portion is formed into a ridge shape having a height width, so that the pressure-bonded area between the outer layer and the inner layer in the bottom seal portion is increased, and the outer layer and the inner layer are formed by providing a plurality of biting portions. Not only further increase the crimping area, but also dramatically increase the resistance to shearing force parallel to the crimping surface, making it possible to obtain a bottom seal with high mechanical strength, which is unlikely to cause bottom cracks. I have.
[0007]
On the other hand, in the synthetic resin bottle described in Patent Document 2, the slit formed in the bottom seal portion due to the bottom crack was positively used as an inlet for outside air between the outer layer and the inner layer, that is, an air inlet. In order to secure the mechanical strength of the bottom, a bottomed cylindrical base cap is externally fitted to the bottom.
[0008]
[Patent Document 1]
JP-A-8-216238 [Patent Document 2]
JP, 2002-36344, A
[Problems to be solved by the invention]
Depending on the purpose of use, there are many cases where the above-mentioned intake hole is formed not in the bottom seal part but in the trunk part or the mouthpiece part, especially when used as a squeeze type delami container, between the outer layer and the inner layer when squeezing. A check valve is arranged in the intake hole to prevent certain air from being discharged to the outside.In this case, if a bottom crack occurs in the bottom seal portion, air between the outer layer and the inner layer leaks from this cracked portion, Since the squeeze operation cannot be performed smoothly, sealing the bottom is an essential condition, and it is necessary to eliminate the bottom crack or to seal the bottom from the outside by some method even if the bottom crack occurs.
[0010]
However, in the conventional technique for eliminating bottom cracks described in Patent Literature 1, the bottom seal portion has a large height width and thickness, so that its volume becomes large, so that it takes a long time for cooling, and There is a problem that the production efficiency is made extremely low.
[0011]
Further, in the prior art described in Patent Document 2, it is necessary to assemble the base cap densely to the bottom using a sealing member such as an O-ring made of a soft material, but especially as a squeeze-type delami container. When used, it is necessary to form the outer layer with a flexible outer shell that can be squeezed and restored, and the outer layer is formed to be relatively thin. There is a problem that it cannot be easily realized.
[0012]
Therefore, the present invention has been devised to solve the above-mentioned problems in the prior art, and a method for securely and easily sealing the bottom portion from the outside at a lower cost as a technical problem, thereby improving operability. It is an object of the present invention to provide a low-cost delami container.
[0013]
[Means for Solving the Problems]
In the present invention for solving the above technical problems, the means of the invention described in claim 1 is:
It is blow-molded from a cylindrical parison, and is formed of an outer layer and an inner layer that is releasably laminated on the outer layer to form an inner bag that can be deformed and reduced in volume. The container body, which is flatly crushed by the pinch-off portion of the mold to form a bottom seal portion formed along the parting line, and has an intake hole in the outer layer for introducing outside air between the outer layer and the inner layer. Having
A bottomed cylindrical bottom cover is externally fitted to the bottom of the container body from below, and a heat-shrinkable synthetic resin tube extends from the lower end of the container body to the cylindrical portion of the bottom cover body. To be hermetically sealed with a body,
It is in.
[0014]
According to the above construction, a bottomed cylindrical bottom cover body is fitted to the bottom of the container body, and a so-called shrink film-like cylindrical body made of a heat-shrinkable synthetic resin is further used as the body of the container body. By externally fitting and heating the range from the lower end of the bottom cover to the cylindrical portion of the bottom cover body, the range from the lower end of the body portion to the cylindrical portion of the bottom cover body is brought into close contact with the cylindrical body. The bottom of the container body can be hermetically sealed with the bottom cover body and the cylindrical body.
[0015]
Here, for the purpose of providing a squeeze-type delamination container, the outer layer of the container body is formed into a relatively thin wall by blow molding, and even when a little gap is generated when the bottom cover body is externally fitted. Since the cylindrical body thermally shrinks along the shape of the outer peripheral surface, the bottom can be sealed from the outside reliably and easily at a low cost in combination with the bottom cover body.
[0016]
Even if the outer layer and the inner layer of the bottom seal part are peeled off and the bottom layer is in a cracked state for some reason due to the hermetic exterior of the bottom part by the bottom cover body and the heat-shrinkable bottomed cylindrical body, the outer layer and the inner layer This has the effect of stopping the discharge of air.
[0017]
In addition, since the bottom is externally fitted and covered with a bottom cover body, a decrease in mechanical strength of the bottom seal can be compensated for, and the bottom is used sanitarily without water or the like entering the cracked portion. In addition, even if the inner layer is broken at the bottom seal portion, the contents are prevented from scattering around.
[0018]
According to a second aspect of the present invention, in the first aspect, the bottom cover body is externally fitted to the bottom of the container body in an undercut shape.
[0019]
According to the above configuration, the bottom cover is firmly fitted to the container body in an undercut shape, so that the mechanical strength of the bottom portion can be further increased, and the bottom cover body is positioned with respect to the container body. Since it does not move up and down, the sealed state can be reliably maintained and secured.
[0020]
According to a third aspect of the present invention, in the first or second aspect of the present invention, a step portion is provided around an upper end portion of a bottom portion of the container main body, near a boundary with a body portion, and an upper end surface of the bottom cover body is formed. That is, it is configured to abut.
[0021]
According to the above configuration, the outer peripheral surface of the upper end portion of the bottom cover body and the outer peripheral surface of the container body can be overlapped without any step by appropriately setting the step of the step portion. It is possible to further improve the adhesiveness of the exterior by the cylindrical body, and to further ensure the sealed state of the bottom part.
[0022]
According to a fourth aspect of the present invention, in the first, second or third aspect of the present invention, an upper locking step for locking an upper portion of the cylindrical body is provided around the outer peripheral surface and lower portion of the body. Configuration.
[0023]
According to the above configuration, the thermally contracted tubular body is brought into close contact with and locked to the upper locking step provided around the lower portion of the body, thereby moving the tubular body in the vertical direction. As a result, the sealed state of the bottom of the container body can be more reliably maintained and secured.
[0024]
According to a fifth aspect of the present invention, in the invention of the fourth aspect, a lower locking step for locking the lower portion of the cylindrical body is provided around the outer peripheral surface and lower portion of the bottom cover body. That is in.
[0025]
According to the above configuration, the heat-shrinkable cylindrical body which is provided on the outer peripheral surface and the lower part of the bottom cover body at the lower part thereof is brought into close contact with and locked by the lower locking step. Since the movement in the direction is suppressed, the sealed state of the bottom of the container body can be more reliably maintained and secured.
[0026]
In particular, by locking the cylindrical body to both the upper locking step portion provided around the container body and the lower locking step portion provided around the bottom cover body, the vertical direction of the cylindrical body Of the container can be reliably suppressed, and the connection between the container body and the bottom cover body can be secured and maintained without providing an undercut portion and firmly fitting the outer cover.
[0027]
According to a sixth aspect of the present invention, in the first, second, third, fourth or fifth aspect of the present invention, the outer layer forms a squeezable deformable outer shell having a resilient and flexible shape. In which a second check valve for stopping the discharge of air from the air conditioner is arranged.
[0028]
The container having the above configuration according to claim 6 has an opening provided with a check valve having a check function (hereinafter referred to as a first check valve) for preventing backflow of contents and inflow of outside air. The squeeze-type dispense container can be provided by fitting the dispense cap body to the mouthpiece portion.
[0029]
In other words, after the contents are poured from the opening of the pouring cap body by the squeeze of the container body, the squeeze is stopped and the pressing pressure is released, and the outer layer starts to return to the original shape by elastic recovery force, and the squeeze is performed. By the function of the first check valve disposed at the opening of the cap body, the discharging of the contents is stopped, the backflow of the contents to the inner container and the inflow of the outside air are stopped, and the inner container is reduced in volume and deformed. Since the state is maintained, external air is introduced between the outer layer and the inner layer through the intake hole, and the outer layer is restored to the original shape.
[0030]
In addition, if the body of the container body is squeezed with the outer layer restored to the original shape, the function of the second check valve is exhibited, and the air between the outer layer and the inner layer is sealed, so that the squeezing operation can be performed smoothly. Can be achieved.
[0031]
Here, even if the outer layer and the inner layer are separated from each other in the bottom seal portion, the air is discharged from the bottom seal portion to the outside during the squeezing operation by the sealing action of the bottom cover body and the shrink film-like cylindrical body. Discharge (leakage) can be stopped, and a smooth squeeze operation can be achieved.
[0032]
According to a seventh aspect of the present invention, in the invention of the sixth aspect, an air intake hole is formed in a body portion of the container body, and the air intake hole can be sealed by a finger of a hand holding the container body, That is, the configuration is such that the function of the second check valve is exhibited.
[0033]
According to the above configuration, the air between the outer layer and the inner layer is kept in a sealed state by closing the intake hole formed in the body with the finger (particularly, the abdomen of the thumb) of the hand holding the container body. Therefore, a squeeze operation can be smoothly achieved. In particular, since a member for arranging the second check valve in the intake hole and processing are not required, a squeeze-type dispensing container is provided at a low cost. can do.
[0034]
According to an eighth aspect of the present invention, in the sixth aspect, an intake hole is formed in a mouthpiece of the container body.
[0035]
As described above, the container having the above configuration according to claim 8 is configured such that the dispensing cap body having the opening provided with the first check valve is fitted to the mouthpiece to form a squeeze-type delami dispensing container. Although provided, the function of the second check valve can be surely exerted by attaching the second check valve at a position of the discharge cap body facing the intake hole formed in the mouthpiece portion. In addition, the intake hole can be arranged at a position that is not visible from the outside, so that a pour container having a good appearance can be provided.
[0036]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1 to 5 show a first embodiment of a synthetic resin container according to the present invention, which comprises a container body 1, a bottom cover body 17 and a cylindrical body 13, and the container body 1 is made of a low-density polyethylene resin. And an inner layer 3 made of a nylon resin having little compatibility with a low-density polyethylene resin, which is obtained by blow molding a parison having two layers laminated. .
[0037]
The overall shape of the container body 1 is a cylindrical bottle, which is composed of a mouthpiece portion 5, a body portion 6 and a bottom portion 7 on which threads are engraved. The height of the container body 1 is 150 mm and the diameter of the body portion 6 Is 40 mm, and is used as a squeeze type pouring container by screwing a pouring cap body 20 to be described later into the mouthpiece section 5. For this reason, the outer layer 2 is formed to be relatively thick so as to form a squeezable deformable and resilient outer shell having flexibility, and the inner layer 3 is formed to be relatively thin so as to form a volume-reducing and deformable inner bag. .
[0038]
An intake hole 15 for introducing outside air between the outer layer 2 and the inner layer 3 (gap 16) is formed in the outer layer 2 located at substantially the center height of the body portion 6, and a shrink film is formed in a lower portion. A peripheral groove serving as an upper locking step 6a for locking the upper part of the cylindrical body 13 is formed.
[0039]
At the upper end of the bottom 7, a step 8 a with which an upper end surface of a bottom cover 17 described later comes into contact from below is provided around the bottom 7, and below the step 8 a, an inner peripheral surface of the bottom cover 17 is engaged. A locking peripheral groove 8b which forms an undercut-shaped locking portion is provided around the retaining circumferential strip 18a.
[0040]
Further, the bottom surface is shaped to have an annular ground portion 9 serving as a ground portion at a peripheral portion, and a flat portion 10 formed at a central portion at a position depressed inward from the annular ground portion 9. The bottom seal portion 11 formed flat along the parting line PL is crushed flat by the pinch-off portion.
[0041]
FIG. 5A is a vertical cross-sectional view of the vicinity of the bottom seal portion 11, and has a cross-sectional structure in which the inner layer 3 is sandwiched between a pair of outer layers 2 from both sides at the end of the bottom seal portion 11. The inner layer 2 and the inner layer 3 are releasably laminated, and if any force is applied, the outer layer 2 and the inner layer 3 are separated as shown in FIG. 5B, and a separated portion 11a is formed.
[0042]
The bottom cover body 17 in the first embodiment is a cylindrical product having a bottom and obtained by injection molding. The upper inner peripheral surface is engaged with the locking peripheral groove 8b of the container body 1 and the undercut strip. A locking rim 18a forming a stop portion is provided around the lower surface, and a lower locking step 18b for locking the lower portion of the tubular body 13 is provided on the outer peripheral surface.
[0043]
The tubular body 13 is formed of a heat-shrinkable film made of synthetic resin, a so-called shrink film (see FIG. 4), and a bottom cover body 17 is fitted to the bottom 7 of the container body 1 in an undercut shape. Then, after the cylindrical tubular body 13 is externally fitted in a range from the circumferential groove 6a formed in the lower part of the body part 6 to the lower end of the bottom cover body 17, it is heated and thermally shrunk to be in close contact. Exterior.
[0044]
Here, the upper end of the cylindrical body 13 is tightly engaged with the peripheral groove 6a of the body 6, and the lower part is in close contact with the lower engaging step 18b of the bottom cover body 17, and these upper and lower parts are in close contact. The vertical movement of the tubular body 13 in particular is suppressed by the locking of, and the sealed state of the bottom 7 can be reliably maintained and ensured.
[0045]
In the first embodiment, the container body 1 and the bottom cover 17 are externally fitted in an undercut shape. However, for example, an undercut locking structure including a locking peripheral groove 8b and a locking ridge 18a. Even without the above, it is possible to secure and maintain the assembly of the container body 1 and the bottom cover body 17 by locking the cylindrical body 13 with the upper and lower locking steps 6a and 18b as described above. .
[0046]
Further, a step 8a is provided around the upper end of the bottom 7 and near the boundary with the body 6, so that the upper end surface of the bottom cover body 17 abuts, so that the step of the step 8a is appropriately set. Thereby, the outer peripheral surface of the upper end portion of the bottom cover body 17 and the outer peripheral surface of the container body 1 can be overlapped without any step, and the adhesiveness of the exterior by the shrink film-like tubular body 13 in this overlapping portion can be further improved. As a result, the sealed state of the bottom 7 can be more reliably ensured. (See Fig. 3)
[0047]
In general, the height position of the boundary between the body portion 6 and the bottom portion 7 of the container body 1 cannot be uniquely defined, but in the description of each embodiment of the present invention, the position shown in FIGS. Is the boundary height position B.
[0048]
Next, FIG. 1 shows a squeeze-type dispensing container, and is a semi-longitudinal section showing a state in which an example of a dispensing cap body 20 is screwed and attached to the mouthpiece portion 5 of the container body 1 of the first embodiment. FIG.
[0049]
The dispensing cap body 20 has a top wall provided with an opening 23 at the center, and a threaded cylinder with an inner peripheral surface engraved with a thread for screwing with the mouthpiece 5 of the container body 1. A cap body 21 having a body, and a pouring cylinder 27 erected on the upper edge of the top wall of the cap body 21 at the opening edge of the opening 23. The contents are poured out, and the spout 22 is covered with a cover cap 29.
[0050]
The dispensing cap body 20 is assembled to the mouth tube portion 5 of the container body 1 by screwing, and a sealing cylinder piece 28 hanging down from the lower surface of the top wall of the cap body 21 and a seal attached to the lower end of the inner peripheral surface. The parts 24 are in close contact with the upper end of the inner peripheral surface and the lower end of the outer peripheral surface of the mouthpiece 5 of the container body 1, respectively, to seal the assembly with the container body 1.
[0051]
The dispensing cap body 20 is provided with a first check valve 25 in the opening 23 of the cap body 21, a check function for normally closing the opening 23 and stopping the invasion of external air, and a container body. When the contents are poured out by squeezing 1, the inner bag 3 is opened by the internal pressure of the inner bag formed by the inner layer 3, and the opening 23 is opened.
[0052]
When the body 6 of the container body 1 is squeezed while closing the intake hole 15 with the belly of the finger S (especially the thumb) of the hand holding the container, the air existing between the outer layer 2 and the inner layer 3 (gap 16) is sealed. As a result, the pressure in the inner layer 2 rises, the first check valve 25 in the closed state is opened, and the contents are discharged to the outside through the outlet 22 at the tip of the discharge cap body 20.
[0053]
Here, even if the peeling portion 11a is generated in the bottom seal portion 11 for some reason, the bottom cover 7 and the tubular body 13 ensure the sealed state of the bottom portion 7 from the outside. The squeeze operation can be smoothly performed without air leaking from the squeeze operation.
[0054]
When the pressure on the body 6 of the container body 1 is released and the closing of the intake hole 15 by the finger S is released, the outer layer 2 starts to be restored to the original shape by the elastic recovery force, and the air between the outer layer 2 and the inner layer 3 is released. Is reduced, and as a result, the internal pressure in the inner layer 3 returns to the external pressure, the first check valve 25 closes, the discharge of the contents stops, and the inner layer body 3 maintains the reduced volume deformed shape while sucking air. External air is introduced between the outer layer 2 and the inner layer 3 through the hole 15, and the outer layer 2 is restored to its original shape. At this time, the separation between the outer layer 2 and the inner layer 3 progresses, and the gap 16 increases.
[0055]
FIG. 6 is an enlarged semi-longitudinal front view of a main part of the second embodiment of the synthetic resin container according to the present invention, in which the vicinity of the bottom 7 is enlarged. The container main body 1 is substantially the same as that of the first embodiment, and is an example using a bottomed cylindrical bottom cover 17 formed by a vacuum forming method.
[0056]
FIGS. 7 and 8 show a third embodiment of the synthetic resin container of the present invention, in which the pouring cap 20 is attached to the mouthpiece 5 in both cases. The configuration different from the first embodiment is a configuration having an adhesive band 4 in which a pair of an outer layer 2 and an inner layer 3 are adhesively fixed on a parting line PL over the entire height range of the container body 1, 5 is a configuration in which a pair is formed in the outer layer 2 on the parting line PL symmetrically with respect to the axis, and a configuration in which the second check valve 26 related to the intake hole 15 is disposed in the pouring cap body 20.
[0057]
By providing a pair of adhesive bands 4 in which the outer layer 2 and the inner layer 3 are bonded and fixed over the entire height range of the container body 1, the volume reduction deformation of the inner layer 3 is restricted to a certain form that does not cause a reduction in the height direction. As a result, a flow path for the contents can be ensured, and a squeeze-type dispensing container with a smoother dispensing operation can be provided.
[0058]
In the configuration in which the suction hole 15 is formed in the outer layer 2 of the mouthpiece portion 5, a pair of the second check valves 26 related to the suction hole 15 are provided in the discharge cap body 20 to form a squeeze-type discharge container. Although it can be used, since the suction hole 15 is hidden in the pouring cap body 20, it is possible to provide a pouring container having a good appearance without being exposed to the outside.
[0059]
In the first embodiment and the third embodiment, the example in which the suction holes 15 are formed in the body portion 6 and the mouthpiece portion 5 respectively has been described, but the outer layer 2 and the inner layer 3 of the bottom seal portion 11 of the container body 1 are peeled off. In this case, the second check valve can be attached to the bottom cover body 17.
[0060]
Further, in the first, second and third embodiments, the embodiment of the container for the squeeze type delamination container has been described. However, the container of the present invention has a configuration in which the outer layer has a fixed outer shell, and the dispenser pump is provided. It can also be used by attaching a cap that combines. In this case, the second check valve is unnecessary.
[0061]
【The invention's effect】
The present invention has the above-described configuration, and has the following effects. According to the first aspect of the present invention, the bottom portion of the container body can be reliably and easily sealed from the outside at a lower cost by the bottom cover body and the shrink film-like tubular body, and smooth squeeze pouring is possible. It is possible to provide a squeeze-type delami container having properties.
[0062]
Further, since the bottom is externally fitted and covered with the bottom cover body, the mechanical strength of the bottom seal portion of the delami container can be ensured.
[0063]
According to the second aspect of the invention, since the bottom cover body is firmly fitted to the container body in an undercut shape, the mechanical strength of the bottom can be further increased, and the bottom cover body is attached to the container body. Since it does not move up and down, the sealed state can be reliably maintained and secured.
[0064]
In the invention according to claim 3, by appropriately setting the step of the step portion, the outer peripheral surface of the upper end portion of the bottom cover body and the outer peripheral surface of the container body can be overlapped without any step, and the shrink film in the overlapping portion is provided. It is possible to further improve the adhesiveness of the exterior by the cylindrical body, and to further ensure the sealed state of the bottom part.
[0065]
According to the fourth aspect of the present invention, the cylindrical body in a thermally contracted state is closely attached to and locked to the upper locking step, thereby suppressing the vertical movement of the cylindrical body. The sealed state of the bottom of the rim can be more reliably maintained and secured.
[0066]
According to the fifth aspect of the present invention, the cylindrical body in a thermally contracted state is closely attached to and locked to the lower locking step, thereby suppressing the vertical movement of the cylindrical body. The sealed state of the bottom of the rim can be more reliably maintained and secured. In addition, by locking the cylindrical body to the upper and lower locking steps, it is possible to secure and maintain the connection between the container body and the bottom cover body without particularly providing an undercut portion and firmly fitting the outer body. it can.
[0067]
In the invention according to claim 6, by forming an outer shell having a squeezable deformable and restorable flexible outer shell, and disposing a second check valve for stopping the discharge of air in the intake hole, The dispensing cap body having the opening provided with the first check valve is fitted to the mouthpiece to provide a dispensing container having a smooth squeezing property.
[0068]
In the invention according to claim 7, an air intake hole is formed in the body portion, and the air intake hole can be sealed by the finger of the hand holding the container body, so that the finger functions as the second check valve. Since no member, processing, or the like is required for arranging the check valve in the intake hole, a squeeze-type dispensing container can be provided at low cost.
[0069]
According to the eighth aspect of the present invention, the intake hole can be arranged at a position invisible from the outside, and a squeeze-type pour container having a good appearance can be provided.
[Brief description of the drawings]
FIG. 1 is a semi-longitudinal front view showing a first embodiment of a synthetic resin container according to the present invention, with a pouring cap attached.
FIG. 2 is a bottom view showing the container body of FIG. 1;
FIG. 3 is an enlarged longitudinal sectional front view of a main part, showing the vicinity of the bottom of the container of FIG. 1 in an enlarged manner.
FIG. 4 is a perspective view showing an example of a tubular body used for the container of FIG. 1;
FIG. 5 is an explanatory view showing the vicinity of a bottom seal portion of the container main body of FIG. 1 in an enlarged longitudinal sectional front view of a main part.
FIG. 6 is an enlarged semi-longitudinal front view of a main part of a second embodiment of the synthetic resin container according to the present invention, in which the vicinity of the bottom is enlarged.
FIG. 7 is a semi-longitudinal front view showing a third embodiment of the synthetic resin container of the present invention with a spout cap body attached thereto.
FIG. 8 is an enlarged semi-longitudinal cross-sectional view of the main part, showing the upper part of FIG. 7 in an enlarged manner.
1; container body 2: outer layer 3; inner layer 4; adhesive band 5; mouthpiece 6; trunk 6 a; upper locking step 7; bottom 8 a; step 8 b; locking peripheral groove 9; Flat part 11; Bottom seal part 11a; Peeling part 13; Tubular body 15; Vent hole 16; Gap 17; Bottom cover body 18a; Body 23; Outlet 23; Opening 24; Seal 25; First check valve 26; Second check valve 27; Discharge cylinder 28; Seal cylinder piece 29; Cover cap PL; Parting line S; Finger B ; Boundary height position

Claims (8)

It is blow-molded from a cylindrical parison, and is formed of an outer layer (2) and an inner layer (3) that is releasably laminated on the outer layer (2) to form an inner bag capable of deforming and reducing the volume. A bottom seal portion (11) formed along a parting line (PL) is formed flat on the bottom surface of the bottom portion (7) by a pinch-off portion of a blow split mold to form a bottom seal portion (11). ) Has a container body (1) having an intake hole (15) for introducing outside air between the outer layer (2) and the inner layer (3), and is provided at a bottom (7) of the container body (1). A bottomed cylindrical bottom cover body (17) is externally fitted from below, and a range from the lower end of the body (6) of the container body (1) to the cylindrical part of the bottom cover body (17). A synthetic resin container characterized in that it is hermetically sealed with a heat-shrinkable synthetic resin tubular body (13). The synthetic resin container according to claim 1, wherein the bottom cover body (17) is externally fitted in an undercut shape to the bottom portion (7) of the container body (1). The step (8a) is provided around the upper end of the bottom part (7) of the container body (1) and near the boundary with the body, and the upper end surface of the bottom cover body (17) is configured to abut. 3. The synthetic resin container according to 1 or 2. 4. The structure according to claim 1, wherein an upper locking step (6a) for locking an upper portion of the cylindrical body (13) is provided around an outer peripheral surface and a lower portion of the body (6). Synthetic resin container. 4. A structure in which a lower locking step (18b) for locking a lower portion of the tubular body (13) is provided around an outer peripheral surface and a lower portion of the bottom cover body (17). 4. The synthetic resin container according to 4. A second check valve (26) in which an outer layer (2) forms a squeezable deformable and resiliently flexible outer shell, and stops the discharge of air from the intake hole (15) to the intake hole (15). The synthetic resin container according to claim 1, wherein the container is arranged. An air inlet (15) is formed in the body (6) of the container body (1), and the air inlet (15) can be sealed by a finger (S) of a hand holding the container body (1); The synthetic resin container according to claim 6, wherein the finger (S) is configured to exert the function of the second check valve (26). The synthetic resin container according to claim 6, wherein an intake hole (15) is formed in the mouthpiece (5) of the container body (1).

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