JP2015131687A - Lamination blow molding container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To create a form of an air suction hole in which peeling of an outer layer and an inner layer can be proceeded with smoothly and certainly near an opening peripheral edge part of the air suction hole, relating to a delamination bottle.SOLUTION: A blow molding container includes a synthetic resin-made outer layer (11) which forms a regular outer shell, and a synthetic resin-made inner layer (12) which is stacked on the outer layer (11) as capable of peeling, with an air suction hole (14) opened at the outer layer (11) by a punch cutter, at a predetermined position of a mouth tube part (2). The shape of the air suction hole (14) at an inner surface side end part of the outer layer (11) is diameter-enlarged as a trumpet shape, so that, a notch-like gap (N) is peripherally provided at the opening peripheral edge part of the air suction hole (14) and between the outer layer (11) and the inner layer (12).

Description

  The present invention comprises an outer layer made of a synthetic resin that forms a fixed outer shell, and an inner layer that is detachably laminated on the outer layer to form an inner bag, and an outer air is formed between the outer layer and the inner layer in the mouth tube portion. The present invention relates to a laminated blow-molded container in which an intake hole for introducing air is perforated.

  A so-called Delami bottle is known as a laminated blow-molded container comprising an outer layer made of a synthetic resin that forms a fixed outer shell and an inner layer that is peelably laminated on the outer layer to form an inner bag. Describes an invention relating to a method and apparatus for perforating and forming an outside air introduction hole in the outer layer portion of the mouth tube portion.

FIG. 9 corresponds to FIG. 2 of Patent Document 1 and is an explanatory view schematically showing a method of forming the intake holes, and shows a state in which the punching device 30 is disposed in the laminated blow-molded container 1.
The container 1 has a mouth tube part 2, a shoulder part 3, and a body part 4, and is a delami bottle in which an outer layer 11 and an inner layer 12 are laminated.
Further, the punching device 30 is mainly composed of a cutter member 40 which is hatched with a receiving member 31 and shown in a longitudinal section.

The receiving member 31 includes a support bar 34 that hangs downward from the support member 32, and a cutter base 36 disposed at the tip of the support bar 34.
The cutter member 40 includes a slide member 41 supported by a support shaft 33 disposed horizontally on the support member 32 so as to be slidable to the left and right, a support bar 42 depending on the slide member 41, and A punch cutter 43 is provided at the tip of the support bar 42 so as to face the cutter cradle 36 of the receiving member 31.

The punch cutter 43 has a cylindrical blade 44 at the tip, and a through hole 46 for leading the cutout piece 11a is provided therein.
Then, the punch cutter 43 moves the sliding member 41 to the left (X direction) in the drawing along the support shaft 33 by driving means (not shown) until the tip of the bolt 37 hits the support bar 34. At this time, the cylindrical blade 44 first presses the inner layer 12 of the mouth tube portion 2 of the container 1 against the receiving surface 36a of the cutter cradle 36, and is then press-fitted into the outer layer 11 of the mouth tube portion 2 of the container 1. The outer layer 11 is cut out while leaving the inner layer 12, and an air intake hole for introducing air is formed between the inner layer 12 and the outer layer 11.
Here, when the gap t between the cutting edge of the cylindrical blade 44 of the punch cutter 43 and the cutter receiving surface 36a is adjusted to the thickness of the inner layer 12 by adjusting the bolt 37, an intake hole is formed only in the outer layer 11. Can do.

FIG. 10 is a longitudinal sectional view showing a laminated state of the outer layer 11 and the inner layer 12 in the vicinity of the intake hole 14 drilled by the above method. After blow molding, in this type of delamination bottle, the outer layer 11 and the inner layer 12 can be peeled off, but are often laminated in close contact.
For this reason, in the dispensing container product using this type of delamination bottle, the outside air is naturally smoothly passed between the outer layer 11 and the inner layer 12 through the intake hole 14 due to the reduced pressure inside the bottle when the content liquid is poured out. In many cases, it is difficult to introduce, and in many cases, after forming the suction hole 14, the inside of the bottle is forcibly depressurized with a vacuum pump or the like through the mouth tube portion 2, and the outer layer 11 and the inner layer 12 are placed in the bottle. It is often used as a state in which the outer layer 11 and the inner layer 12 are laminated again after being peeled over the entire region to make the contact between the outer layer 11 and the inner layer 12 once eliminated, and then air is blown from the mouth tube portion. .

JP-A-8-244102

Here, in blow molding, the thickness of the parison often varies, but according to the method of forming the air intake holes described in Patent Document 1, the gap t shown in FIG. In this case, the introduction hole can be drilled only in the outer layer 11 even if there is a variation in thickness, but in principle, the outer layer 11 can be formed by bringing the cutting edge of the punch cutter into contact with the outer peripheral surface of the outer layer 11. 11 is a method of completely cutting out 11, and there is a risk that a blade mark remains on the inner layer 12 to become thin, leading to a breakage of the inner layer 12.
Further, there is a problem that it is difficult to remove the waste residue generated by the punching of the outer layer 11 with a punch cutter, and that this residue remains and the intake hole is difficult to open.

  On the other hand, as described above, when the outer layer 11 and the inner layer 12 are forcibly peeled over almost the entire region of the bottle, the adhesion between the outer layer 11 and the inner layer 12 is eliminated once and used as a layered state again. The inner layer 12 in the mouth tube portion 2 has high rigidity due to its large thickness, and has a large elastic return force after peeling, and partially returns to the close contact state after peeling, and the inner layer 12 from the outer layer 11 is restored. There remains a risk that peeling will not proceed smoothly and reliably.

  Therefore, an object of the present invention is to eliminate the above-described problems in the related art related to the delami bottle, and it is possible to form an intake hole without leaving a blade mark due to the cutting edge of the punch cutter in the inner layer. The object is to create a shape of the intake hole that allows the outer layer and the inner layer to peel smoothly and reliably in the vicinity of the peripheral edge of the opening.

The main configuration of the laminated blow molded container according to the present invention is as follows.
Blow molding that consists of a synthetic resin outer layer that forms a regular outer shell and a synthetic resin inner layer that is peelably laminated on the outer layer, and in which a suction cutter is drilled in the outer layer by a punch cutter at a predetermined position in the mouth tube In the container,
The shape of the air intake hole at the inner surface side end of the outer layer is formed in a trumpet shape so that a notch-shaped gap is provided around the outer peripheral edge of the air intake hole and between the outer layer and the inner layer. It is said that.

In the vicinity of the air intake hole, the inner layer is laminated on the outer layer and covers the air intake hole in a bridging manner, but according to the above configuration, the air intake hole has a shape that is enlarged in a trumpet shape at the inner surface side end portion of the outer layer. Accordingly, a notch-like gap is formed between the outer layer and the inner layer at the opening peripheral edge of the intake hole.
Then, starting from the notch-shaped gap, separation between the outer layer and the inner layer can be started and progressed smoothly, and the introduction of outside air between the outer layer and the inner layer can be introduced through the intake holes. It can be easily achieved.

  Another configuration related to the laminated blow-molded container is that, in the main configuration described above, irregularities due to burrs generated in a punching process by a punch cutter are formed at the opening peripheral edge of the intake hole at the inner surface side end of the outer layer. Is.

  With the above configuration, unevenness due to burrs is formed on the peripheral edge of the intake hole at the inner surface side edge of the outer layer, thereby avoiding close contact between the outer layer and the inner layer at the peripheral edge of the intake hole where the unevenness is formed. In combination with the effect of the notch-shaped gap described above, it is possible to start and advance the outer layer and the inner layer smoothly and reliably, and to introduce the outside air between the outer layer and the inner layer. Can be easily achieved through the intake holes.

Here, with the above-described function of preventing the locking portion from coming off, the cut-out piece that has been cut out leaving the uncut portion remaining in the cylindrical blade is retracted, and the uncut-out portion is broken by this retraction to completely remove the cut-out piece. In this state, the shape of the air intake hole can be a shape that is enlarged in a trumpet shape at the end portion on the inner surface side of the outer layer.
Further, by forcibly breaking the uncut portion, burrs are generated at the opening peripheral edge portion of the intake hole along with the rupture, and irregularities can be formed by the burrs.

As a reference, the main structure of the method of forming the intake hole is as follows:
A method of forming an air inlet hole in an outer layer by a punch cutter at a predetermined position of a mouth tube portion of a blow molded container comprising an outer layer made of a synthetic resin that forms a fixed outer shell and an inner layer made of a synthetic resin that is peelably laminated on the outer layer Because
The punch cutter has a cylindrical blade at the tip, and an inner peripheral surface of this cylindrical blade is provided with a locking portion that exerts a function to prevent the cylindrical blade from coming off from the outer layer when retracted from the outer layer. use,
The cylindrical blade is press-fitted and advanced until the cutting edge is in the closest position to the inner surface of the outer layer, and the outer layer is not completely cut out, leaving an uncut portion at the tip in a circumferential shape,
Next, with the function of preventing the locking portion from coming off with the retraction of the cylindrical blade, the cut-out piece that remains in the cylindrical blade and leaves the non-cut-out portion is retreated, and this retraction causes the uncut-out portion to be removed. It is said that the intake hole is perforated in a state where the cut piece is completely cut out by breaking.

According to the above method for forming the air intake hole, the cutting edge of the cylindrical blade disposed at the tip of the punch cutter stays inside the outer layer and does not directly contact the inner layer. The air intake hole can be formed without leaving a blade mark due to the blade edge in the inner layer.
In addition, the function of preventing the locking portion from coming off causes the cutout piece to be cut out while leaving the uncutout portion remaining in the cylindrical blade, and the cutout piece is completely cut out by breaking the uncutout portion by this retreat. In this state, the cut-out piece can be completely removed from the intake hole, and the problem that the cut residue remains and the intake hole is difficult to open is completely eliminated. be able to.

  Further, in the method for forming the suction hole, a reduced diameter step portion may be provided around the inner peripheral surface of the cylindrical blade of the punch cutter, and this reduced diameter step portion may be used as a locking portion.

The above forming method uses a punch cutter in which a latching portion is provided on the inner peripheral surface of the cylindrical blade, and the cutout piece remaining in the cylindrical blade is not cut out by using the function of preventing the latching portion from coming off. The shape of the cylindrical blade, including the locking part, is characteristic in that it breaks the part, but the press-fitting advanceability into the outer layer of the cylindrical blade, the cutting ability of the outer layer, and the breakability of the uncut part due to the function of preventing the removal Etc. can be determined as appropriate.
The above configuration is one of the specific examples of the locking portion. The reduced diameter step portion sufficiently exhibits the function of preventing the removal, and the cutout piece remaining in the cylindrical blade is hooked by this reduced diameter step portion. The uncut portion can be easily broken.
Here, the shape of the reduced diameter step portion, including how far the reduced diameter step portion is arranged from the cutting edge and how much the reduced diameter is, the press-fitting advanceability to the outer layer described above, It can be determined as appropriate in consideration of the cutability and the breakability of the uncut portion due to the prevention function.

  Moreover, in the structure which uses the said latching | locking part as a diameter reduction step part, it is good also as a structure which expands the internal peripheral surface of a cylindrical blade in a taper shape from the inner peripheral end of a diameter reduction step part, and reaches a blade edge | tip.

  Or in the structure which uses the said latching | locking part as a diameter-reduced step part, you may provide the diameter-reduced step part in the circumferential direction in the shape of an intermittent.

  If a reduced diameter step is provided around the inner peripheral surface of the cylindrical blade, there is a concern that the press-fitting advanceability of the cylindrical blade into the outer layer or the cutting ability of the outer layer may be reduced. By reducing the diameter from the peripheral end to a tapered shape and reaching the cutting edge, or by reducing the diameter of the stepped portion in the circumferential direction, the press-fitting advanceability to the outer layer or the cutting ability of the outer layer is reduced. It becomes possible to suppress.

  Further, in the above air hole formation method, a tapered diameter-reduced portion that is tapered toward the blade tip is formed on the inner peripheral surface of the punch blade, and the tapered diameter-reduced portion is locked. It is good as a part.

  The above configuration is also a specific example of the locking portion, and by forming the locking portion as a tapered reduced diameter portion, a stepped portion is not formed. The cutting ability of the outer layer can be maintained satisfactorily, and the function of preventing the removal can be exhibited on the tapered surface of the tapered diameter-reduced portion.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the laminated blow-molded container of the present invention, the intake hole is formed in a trumpet shape at the inner surface side end of the outer layer, so that a notch shape is formed between the outer layer and the inner layer at the opening peripheral edge of the intake hole. With this gap as a starting point, separation between the outer layer and the inner layer can be started and progressed smoothly, and the introduction of outside air between the outer layer and the inner layer can be introduced via the intake holes. Can be easily achieved.
Further, by forming irregularities due to burrs at the peripheral edge of the opening of the intake hole at the inner surface side end of the outer layer, it is possible to avoid close contact between the outer layer and the inner layer at the peripheral edge of the intake hole where the irregularity is formed. In combination with the above-described effect of the notch-shaped gap, separation between the outer layer and the inner layer can be started and progressed more smoothly and reliably, and the outside air between the outer layer and the inner layer can be Introduction can be easily achieved via the air inlet.

It is a side view which partially cuts and shows the extraction container with a pump which utilized one Example of the container of this invention as a container main body. FIG. 2 is an enlarged view of the main portion of the container shown in FIG. 1 in the vicinity of an intake hole, (a) is a longitudinal sectional view, and (b) is a view as seen from the direction of a thick arrow in (a). It is a schematic explanatory drawing of the formation method of an air intake hole of the present invention. FIG. 2 shows an example of a punch cutter used when forming the air intake hole in FIG. 1, (a) is a longitudinal sectional view, (b) is an enlarged view near the cylindrical blade, and (c) is a further portion near the blade edge. It is an enlarged view. (A) is a bottom view of the punch cutter of FIG. 4, (b) is an enlarged view of the cutting edge in (a). It is a schematic explanatory drawing of the formation process of an air intake hole. The other example of a punch cutter is shown, (a) is a longitudinal cross-sectional view, (b) is an enlarged view near the cylindrical blade. Still another example of a punch cutter is shown, (a) is a longitudinal sectional view, and (b) is an enlarged view in the vicinity of a cylindrical blade. It is explanatory drawing which shows schematically the formation method of the conventional intake hole. It is a longitudinal cross-sectional view which shows the lamination | stacking state of the outer layer and inner layer in the vicinity of the conventional inlet hole.

Hereinafter, the configuration of the present invention and the operation and effects thereof will be described according to embodiments with reference to the drawings.
FIG. 1 is a side view partially showing a pumping-out container using a laminated blow-molded container according to an embodiment of the present invention as a container body.
A container 1 that is a delami bottle has a laminated wall structure of an outer layer 11 made of a synthetic resin that forms a fixed outer shell and an inner layer 12 made of a synthetic resin that is detachably laminated on the outer layer 11 to form an inner bag. . Then, on the upper end of the bottomed cylindrical body portion 4, a thread is projected on the outer peripheral surface via a tapered tubular shoulder portion 3 whose diameter is reduced upward, and on the outer layer 11 portion below the thread, It has a configuration in which the mouth tube portion 2 in which the intake hole 14 is formed by punching with a punch cutter is continuously provided.
In the container 1 of this embodiment, the outer layer 11 is made of high density polyethylene (HDPE) resin, and the inner layer 12 is nylon resin. Also, a pair of intake holes 14 are formed in the front and rear (a pair of left and right in FIG. 1).

  The assembling of the dispensing pump 25 having the nozzle head 26 to the container 1 is carried out in the state where the body portion of the dispensing pump 25 is inserted into the container 1 and formed on the upper end portion of the body portion of the dispensing pump 25. A flange-like assembled flange 27 is placed on the upper end surface of the mouthpiece part 2 via a packing piece 28, and this assembled flange 27 is externally screwed to the mouthpiece part 2 by the screwed cylinder wall 22. This is achieved by pressing against the upper end surface of the mouth tube part 2 with the inner wall-like top wall 23 of the cap 21. FIG. 1 shows a state in which the outer layer 11 and the inner layer 12 are separated in the vicinity of the intake hole 14 and a separation space S is formed.

2A and 2B are enlarged views of the vicinity of the intake hole 14 of the container of FIG. 1, wherein FIG. 2A is a longitudinal sectional view, and FIG. 2B is a view of the intake hole 14 viewed from the direction of the thick arrow in FIG. It is.
2 (a) and 2 (b), the intake hole 14 has a shape expanded in a trumpet shape at the inner surface side end of the outer layer 11, as indicated by a trumpet-shaped portion 14a.
Further, in FIG. 2A and FIG. 2B, the opening peripheral edge portion of the intake hole 14 at the inner surface side end portion of the outer layer 11 shown by cross-hatching is provided with irregularities 11c due to burrs generated in a punching process by a punch cutter. Is formed.
The trumpet-like portion 14a and the irregularities 11c due to burrs can be formed by adopting a method for forming an intake hole described later.

By forming the end portion of the intake hole 14 as the trumpet-shaped portion 14a as described above, a notch-shaped gap N (see FIG. 2A) between the outer layer 11 and the inner layer 12 at the opening peripheral edge of the intake hole 14 of the outer layer 11. )) Is formed.
The notch-shaped gap N serves as a starting point for the progress of peeling, and as shown by a two-dot chain line in FIG. 2A, the peeling between the outer layer 11 and the inner layer 12 to be laminated smoothly starts and progresses. Thus, the separation space S can be expanded, and the outside air A can be easily introduced between the outer layer 11 and the inner layer 12 through the intake holes 14.

  Furthermore, due to the irregularities 11c formed by burrs formed at the peripheral edge of the opening of the intake hole 14 at the inner surface side end of the outer layer 11, the close contact between the outer layer 11 and the inner layer 12 can be avoided at the peripheral edge of the opening. The outer layer 11 and the inner layer 12 can be separated more smoothly in combination with the effect of the gap N.

  Here, in the conventional air intake hole 14 shown in FIG. 10, as described above, the outer layer 11 and the inner layer 12 are peeled off once, and the adhesion between the outer layer 11 and the inner layer 12 is eliminated and used again as a laminated state. When it is difficult to start the separation of the outer layer 11 and the inner layer 12 due to factors such as the absence of a separation starting point such as the notch-shaped gap N in FIG. For example, there is a possibility that the operability of dispensing the content liquid may be lowered in the dispensing container as shown in FIG.

Next, a method for forming the intake holes will be described for reference.
FIG. 3 is a schematic explanatory view of a method for forming the air intake hole. The overall structure of the drilling device used is similar to that shown in FIG. 9, and a support bar 34 provided with a cutter cradle 36 at the tip is provided. A punch cutter 43 is disposed so as to be inserted into the mouth tube portion 2 of the container 1 and to face the cutter cradle 36.
When the pair of intake holes 14 are formed on the left and right as in the container 1 shown in FIG. 1, the punching devices are also arranged symmetrically, and the pair of punch cutters 43 are disposed on the left and right. To implement.

And the outline of the formation method of the air intake hole is
The cylindrical blade 44 of the punch cutter 43 is press-fitted and advanced into the outer layer 11, the outer layer 11 is not completely cut out, and the uncut portion 11 b is left circumferentially at the tip, and then the punch cutter 43 is moved backward. The uncut portion 11b is broken by the function of preventing the locking portion 45, which will be described later, and the intake hole 14 is drilled and formed.
For this reason, in the method for forming the intake hole, the cutting edge of the cylindrical blade 44 disposed at the tip of the punch cutter 43 stays inside the outer layer 11 and does not directly contact the inner layer 12. The suction hole 14 can be formed without leaving a blade mark due to the cutting edge of the punch cutter in the inner layer 12 as in the forming method.

4 and 5 show a punch cutter 43 used in this embodiment, FIG. 4 (a) is a longitudinal sectional view, FIG. 4 (b) is an enlarged view of the vicinity of the cylindrical blade 44, and FIG. 4 (c) is a cutting edge 44p. FIG. 5A is a bottom view, and FIG. 5B is an enlarged view of the cutting edge 44p in FIG. 5A.
This punch cutter 43 has a cylindrical blade 44 at the tip, and four diameter-reduced stepped portions 45a, which are one embodiment of the locking portion 45, are provided in an intermittent manner on the inner peripheral surface of the cylindrical blade 44 (see FIG. 5 (b)).

In addition, the region from the inner peripheral end of the reduced diameter step portion 45a to the blade edge 44p is a tapered portion 45a1 having a diameter increased in a taper shape, and in combination with the intermittent arrangement as described above, a cylindrical shape The press-fitting forward movement and backward movement of the blade 44 can be achieved smoothly.
The diameter of the cutting edge 44p of the punch cutter 43 is 4 mm, and the distance h between the formation position of the reduced diameter step portion 45a and the cutting edge 44p (see FIG. 4B) is 0.8 mm.

6A and 6B are schematic explanatory diagrams of the formation process of the intake hole 14, wherein FIG. 6A is a state in which the cylindrical blade 44 is positioned at the press-fitting advance limit, and FIG. 6B is an enlarged view of the vicinity of the blade edge 44p in FIG. (C) shows a state in which the cylindrical blade 44 is retracted from the press-fit advance limit.
As shown in FIG. 6A, the cylindrical blade 44 is positioned at the press-fit advance limit, and the blade tip 44 p is positioned immediately before the inner peripheral surface of the outer layer 11. In the present embodiment, the thickness of the lower portion of the mouth tube portion 2 that pierces the intake hole 14 is 2.5 mm, but the position of about 0.02 mm from the inner peripheral surface of the outer layer 11 is set as the press-fit advance limit, The cutout piece 11a remains in the cylindrical blade 44 with the uncutout portion 11b remaining circumferentially at the tip without being cut out completely.

  Next, when the punch cutter 43 is retracted from the state shown in FIG. 6A, as shown in FIG. The cut-out piece 11a which remains in the cylindrical blade 44 and is cut out leaving the uncut-out portion 11b is retracted so as to be hooked by the reduced diameter step portion 45a, and the circumferential uncut-out portion 11b is broken by this retreat. As a result, the intake hole 14 is perforated with the cutout piece 11a completely punched out.

Here, if the cut-out piece 11a is to be displaced in the direction of the arrow in FIG. 6C by the function of preventing the diameter-reduced step 45a from coming off, the uncut-out portion 11b has a direction indicated by Sf in FIG. 6B. A shear stress acts on this, and the uncut portion 11b is broken by this shear stress, so that a trumpet-shaped portion 14a whose diameter is expanded in a trumpet shape is formed at the end of the intake hole 14 as shown in FIG. The
Further, when the uncut portion 11b is broken, the synthetic resin (HDPE resin in this embodiment) is stretched and deformed to some extent, so that it is accompanied by breakage as shown in the enlarged view in FIG. 6C. Unevenness 11c due to burrs is formed.

Here, the shape of the punch cutter 43 used for forming the intake hole 14, particularly the shape of the locking portion 45, is determined by considering the material of the synthetic resin used for the outer layer 11, the press-fitting advanceability of the cylindrical blade 44, and the outer layer 11. Although it can be determined in consideration of the balance between the cut-out property and the removal preventing function by the locking part 45, FIGS. 7 and 8 show other two examples.
The example of FIG. 7 uses the reduced diameter step portion 45a as the locking portion 45 as in the punch cutter of FIG. 4, but the reduced diameter step portion 45a with respect to that of FIG. It is characteristically formed, and accordingly, the degree of diameter reduction by the reduced diameter step portion 45a is reduced in consideration of the balance between the press-fitting advanceability and the escape prevention function, and the formation position of the reduced diameter step portion 45a It is characteristic that the distance h between the cutting edges 44p is as small as 0.4 mm.

  In the example of FIG. 8, the inner peripheral surface of the cylindrical blade 44 is tapered toward the blade tip 44p to form a tapered diameter-reduced portion 45b, and the taper surface of the tapered diameter-reduced portion 45b is removed. It is intended to demonstrate the prevention function. Since there is no stepped portion, it is possible to exert a good press-fitting advanceability and a function of preventing slippage, particularly with a hard synthetic resin.

As mentioned above, although this invention was demonstrated using the Example, this invention is not limited to these Examples.
For example, three examples of the punch cutter to be used have been described. Further, considering the press-fitting advanceability and the escape prevention function, for example, a plurality of protrusions having an appropriate shape are arranged around the periphery to form a locking portion. In addition, various variations can be adopted.
Further, the Delami bottle type laminated blow-molded container of the present invention includes a container body of a dispensing container with a comb body in which a comb body is fitted to a mouth tube part, and a squeeze, in addition to a container body of a dispensing container with a pump. It can also be used as a type of delamination container.

  As described above, the method of forming the air intake hole can form the air intake hole without leaving a blade mark due to the cutting edge of the punch cutter in the inner layer, and the laminated blow molded container of the present invention has an opening peripheral edge portion of the air intake hole. The separation of the outer layer and the inner layer can be started and progressed smoothly and reliably in the vicinity, and it is expected to be used in a wide range of fields as a delamination container with excellent dispensing operability.

DESCRIPTION OF SYMBOLS 1; Container 2; Mouth part 3; Shoulder part 4; The trunk | drum 11; Outer layer 11a; Cut-out piece 11b; Uncut part 11c; Unevenness (by burr) 12; Inner layer 14; Intake hole 14a; Space N; Notch-shaped gap A; Outside air 21; Cap 22; Screwed cylindrical wall 23; Top wall 25; Pouring pump 26; Nozzle head 27; Assembly flange 28; Packing piece 30; Support member 33; Support shaft 34; Support bar 36; Cutter cradle 36a; Receiving surface 37; Bolt 40; Cutter member 41; Sliding member 42; Support bar 43: Punch cutter 44; Locking portion 45a; reduced diameter step portion 45a1; taper portion
45b; tapered diameter-reduced portion 46; through hole t; gap

Claims (2)

It consists of a synthetic resin outer layer (11) that forms a fixed outer shell and a synthetic resin inner layer (12) that is peelably laminated on the outer layer (11). A blow molded container having an air hole (14) drilled in the outer layer (11) by a punch cutter,
By forming the shape of the intake hole (14) at the inner surface side end of the outer layer (11) into a trumpet shape, the outer periphery (11) and the outer peripheral edge of the intake hole (14) are formed. A blow-molded container characterized in that a notch-shaped gap (N) is provided between the inner layer (12) and the inner layer (12).   The blow-molded container according to claim 1, wherein irregularities (11c) due to burrs generated in a punching step by a punch cutter are formed at the opening peripheral edge of the intake hole (14) at the inner surface side end of the outer layer (11).

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