JP2008100720A - Capacity reduction method for plastic bottle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacity reduction method for a plastic bottle designed so that a fully pushed-out movable section can be pushed in by a small force. <P>SOLUTION: The capacity reduction method is provided for the plastic bottle. In this method, the inner capacity of the plastic bottle 10 is reduced by pushing in the pushed-out movable section 20 of the plastic bottle 10, the movable section 20 formed so as to be pushed out or in from the bottom 15 continuous with a barrel 13. The capacity reduction method includes a first step for pushing a first portion around the movable section 20 to incline and partially push in the movable portion 20, and a second step for pushing a second portion different from the first portion of the inclined movable section 20 to push in the rest portion of the movable section 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a plastic bottle volume reducing method for reducing the internal volume of a plastic bottle whose internal volume can be changed by expansion and contraction in the height direction by pushing and pushing a movable part formed at the bottom.

  2. Description of the Related Art Conventionally, a plastic bottle (for example, a plastic bottle) capable of changing an inner volume by expansion and contraction in a height direction by pushing and pushing a movable portion formed on a bottom is known (see, for example, Patent Document 1). The volume of the plastic bottle is reduced in the process of cooling the liquid drink after filling the hot drink such as tea drink (high temperature filling) with the movable part at the bottom pushed out and tightening the cap. Along with this, the decrease in internal pressure is absorbed (prevented) by pushing in the movable part and reducing the internal volume.

As a method of pushing in the movable part formed at the bottom of the plastic bottle as described above, a rod rod is inserted into a mortar-shaped recess formed in the movable part, and the movable part is pushed in by pushing this rod bar. Is generally considered.
JP-T-2006-501109

  However, in the method as described above, the necessary pressing force tends to increase in order to push the movable portion in a completely pushed state together by the pressing force of the rod rod. For this reason, the power of the cylinder for moving the rod rod forward or backward must be increased, or the strength of the structure for holding the plastic bottle on which such a large force acts must be increased. There is a point.

  The present invention has been made in view of such circumstances, and provides a volume reduction method for a plastic bottle that can push in a movable portion that has been completely extruded with a smaller force. is there.

  The volume reduction method of the plastic bottle according to the present invention includes the step of pushing the movable part into the extruded state of the plastic bottle formed with the movable part that can be pushed and pushed into the bottom part formed following the body part. A plastic bottle volume reducing method for reducing the internal volume of a plastic bottle, the first step of pushing the first part of the periphery of the movable part to incline the movable part and partially pushing the inclined part, And a second step of pushing the second part different from the first part of the movable part and pushing the remaining part of the movable part.

  With such a configuration, the movable part that is formed in the extruded state formed at the bottom of the plastic bottle is first pushed in part in an inclined manner, and then pushed in completely in two stages: the remaining part is pushed in. It becomes like this.

  In the plastic bottle volume reducing method according to the present invention, the second step can be configured to push a central part of the movable part as the second part.

  With such a configuration, since the central part of the movable part that is in a state where the first part of the peripheral part is pushed and inclined and partially pushed in is pushed, the remaining part of the movable part can be pushed in. It becomes possible.

  Also, in the plastic bottle volume reducing method according to the present invention, the second step pushes a portion of the peripheral portion opposite to the first portion as the second portion across the central portion of the movable portion. Can be configured.

  With such a configuration, the first portion of the peripheral portion is pushed and inclined, and the portion of the peripheral portion on the opposite side of the first portion is sandwiched between the central portion of the movable portion. Since it is pushed, the remaining part of the movable part can be pushed in.

  Further, in the plastic bottle volume reducing method according to the present invention, the movable portion of the plastic bottle includes an annular inclined portion extending obliquely from an outer edge portion of the bottom portion, and a flat continuing inward of the annular inclined portion. A boundary between the outer edge line portion of the inclined portion and the flat portion, which is a boundary with the outer edge portion of the bottom portion And the inner edge line portion of the inclined portion can be bent in each direction of the push-in press-in, and the first step is a predetermined portion in either the inclined portion or the flat portion that is a peripheral portion of the movable portion. As the first part, and in the second step, a predetermined part of the concave part inside the concave part is pushed as the second part.

  With such a configuration, first, a predetermined portion of the inclined portion or the flat portion of the movable portion that is in an extruded state is pushed, and the outer edge line portion and the inner edge line portion of the inclined portion in the vicinity of the predetermined portion are bent. Then, the movable part is inclined and partially pushed. Next, a predetermined portion of the concave portion inside the inclined portion and the flat portion is pressed so that the outer edge line portion of the inclined portion and the remaining portion of the inner edge line portion are bent so that the remaining portion of the movable portion is pushed in. Become.

  In the plastic bottle volume reducing method according to the present invention, the first step can be configured to push a predetermined portion of the inclined portion as the first portion.

  With such a configuration, while the predetermined portion of the inclined portion of the movable portion that is in the pushed state is pushed, the outer edge line portion and the inner edge line portion of the inclined portion in the vicinity of the predetermined portion are bent and the movable portion is inclined. It becomes partly pushed in.

  In the plastic bottle volume reducing method according to the present invention, the first step can be configured to push a predetermined portion of the flat portion as the first portion.

  With such a configuration, while the predetermined portion of the flat portion of the movable portion that is in the extruded state is pressed, the outer edge line portion and the inner edge line portion in the portion of the inclined portion connected to the predetermined portion are bent, and the movable portion is inclined. Can be partially pushed in.

  Furthermore, in the plastic bottle volume reducing method according to the present invention, the second step can be configured to push a predetermined portion of the inclined inner peripheral surface of the concave portion as the second portion.

  With such a configuration, the inclination of the concave portion located inside the inclined portion and the flat portion of the movable portion that is in a state where the predetermined portion of either the inclined portion or the flat portion is pushed and inclined to be partially pushed in. Since the predetermined part of the inner peripheral surface is pushed, the remaining part of the movable part can be pushed in.

  In the plastic bottle volume reducing method according to the present invention, the second step can be configured to push the bottom center portion of the recess as the second portion.

  With such a configuration, the bottom of the concave portion located inside the inclined portion and the flat portion of the movable portion that is in a state where the predetermined portion of the inclined portion or the flat portion is pushed and inclined and partially pushed in. Since the central portion is pushed, the remaining portion of the movable portion can be pushed in.

  Further, in the plastic bottle volume reducing method according to the present invention, a mechanism having a push rod body that can be moved back and forth and rotated is used, and the first step rotates the push rod body and tilts the tip bar by the tip portion. The predetermined portion of the part is pushed, and the second step can be configured to advance the push rod body and push the bottom center portion of the recess while the rotation of the push rod body is stopped.

  With such a configuration, first, a predetermined portion of the inclined portion is pushed by the distal end portion of the rotating push rod body, and the outer edge line portion and the inner edge line portion of the inclined portion in the vicinity of the predetermined portion are bent, so that the movable portion. Is tilted and partially pushed in. Next, the bottom central portion of the concave portion located inside the inclined portion of the movable portion that is partially pushed and inclined is pushed by the push rod body that advances, and the remaining portion of the movable portion is pushed in.

  In the plastic bottle volume reducing method according to the present invention, a mechanism having a rotatable push rod body is used. In the first step, the push rod body is rotated and the tip portion of the predetermined portion of the inclined portion is rotated. The part can be pushed, and the second step can be configured to further rotate the push rod body and push a predetermined part of the inclined inner peripheral surface of the recess by its tip part.

  With such a configuration, first, a predetermined portion of the inclined portion is pushed by the distal end portion of the rotating push rod body, and the outer edge line portion and the inner edge line portion of the inclined portion in the vicinity of the predetermined portion are bent, so that the movable portion. Is tilted and partially pushed in. Next, a predetermined portion of the inclined peripheral surface of the concave portion located inside the inclined portion of the movable portion that is inclined and partially pushed is pushed by the distal end portion of the push rod body that is further rotated to move the movable portion. The rest of the part is pushed in.

  Further, in the plastic bottle volume reducing method according to the present invention, a mechanism having a push block capable of moving forward and backward with an inclined top surface and a push rod body capable of moving in and out of the top surface of the push block is used. In the step, the push block is advanced and the flat portion following the inclined portion of the movable portion is pushed by the inclined top surface. In the second step, the push rod body is moved in the state where the push block is advanced. Can be configured to advance from the top surface of the push block and push the bottom center of the recess.

  With such a configuration, the outer edge line portion and the inner edge line portion in the portion of the inclined portion connected to the pressed portion are first pressed while the flat portion of the movable portion is partially pressed on the inclined top surface of the push block that advances. And the movable portion is inclined and partially pushed. Next, the bottom center portion of the concave portion located inside the flat portion of the movable portion that is inclined and partially pushed in is pushed by the push rod body that advances from the push block, and the remaining portion of the movable portion Is pushed in.

  According to the method for reducing the volume of a plastic bottle according to the present invention, the movable part that is formed in the extruded state at the bottom of the plastic bottle is first pushed in part in an inclined manner, and then the remaining part is pushed in. Since it can be completely pushed in in two stages, the force required to push in the movable part in each stage can be reduced as compared with the case where the movable part is pushed in all at once. Therefore, it becomes possible to push in the movable portion in a completely extruded state with a smaller force.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The structure of a plastic bottle whose internal volume is to be reduced according to the plastic bottle volume reducing method according to each embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing a plastic bottle together with a push-in mechanism, FIG. 2 is a partially cutaway side view showing a lower part of the plastic bottle in a state where a movable part of the bottom is pushed out, and FIG. FIG. 4 is a partially cutaway side view showing a lower part of the plastic bottle in a state where the movable part is pushed in, and FIG. 4 is a perspective view of the plastic bottle as seen from the bottom.

  In FIG. 1, a plastic bottle 10 whose internal volume is to be reduced is formed by, for example, biaxial stretch blow molding of PET. It is the structure connected to the bottom part 15 through. Further, referring to FIGS. 2 to 4, the bottom portion 15 is formed with a movable portion 20 that can be pushed out and pushed in the longitudinal direction of the plastic bottle 10 (the vertical direction in FIGS. 2 and 3). The movable portion 20 includes an annular inclined portion 21 extending obliquely from the outer edge portion 15 a of the bottom portion 15, a flat portion 22 surrounded by the inclined portion 21 and continuing inward thereof, and a mortar continuing further inward of the flat portion 22. And a concave portion 23 having an inclined inner peripheral surface. The outer edge line portion 211 of the inclined portion 21 that becomes the boundary with the outer edge portion 15 a of the bottom portion 15 can be bent in the longitudinal direction of the plastic bottle 10, and the inner edge line of the inclined portion 21 that becomes the boundary with the flat portion 22. The part 212 is also bendable in the longitudinal direction of the plastic bottle 10. As described above, each of the outer edge line portion 211 and the inner edge line portion 212 of the inclined portion 21 can be bent, so that the inclined portion 21 is reversed in the longitudinal direction of the plastic bottle 10 (the state shown in FIG. 2 and FIG. 3). The reversing operation of the inclined portion 21 allows the movable portion 20 to be pushed out and pushed in the vertical axis direction. In addition, the flat part 22 and the recessed part 23 following the inclined part 21 are maintained without changing the shape at the time of the reversing operation of the inclined part 21 described above.

  In particular, referring to FIG. 4, the outer edge line portion 211 of the inclined portion 21 has a linear shape connecting the regular vertices 25a, 25b, 25c, 25d, 25e, 25f, 25g, and 25h. The line connecting the vertices has a shape slightly bulging radially outward. The inner edge line portion 212 of the inclined portion 21 is substantially parallel to the outer edge line portion 212. That is, the inner edge line portion 212 is also in a linear shape connecting the regular vertices 26a, 26b, 26c, 26d, 26e, 26f, 25g, and 26h. In addition, the inclined portion 21 has a V-shape that connects the vertices 25a to 25h (regular octagon vertices) of the outer edge line portion 211 and the corresponding vertices 26a to 26h (regular octagon vertices) of the inner edge line portion 212. Grooves 27a, 27b, 27c, 27d, 27e, 27f, 27g, and 27h are formed. By changing the V-shaped angle of each of the V-shaped grooves 27a to 27h, the inclined portion 21 can be deformed in the plane.

  Furthermore, the boundary line part 221 between the flat part 22 and the recessed part 23 is substantially parallel to the inner edge line part 212 of the inclined part 21, and is a line connecting each vertex of the regular octagon. And the V-shaped groove | channel is formed in the inclination internal peripheral surface in the recessed part 23 so that it may extend toward the bottom from each vertex of the regular octagon. The concave portion 23 is reinforced by the V-shaped groove. Further, the cut surfaces 16a, 16b, 16c, 16d, 16e, and 16f are directed from the body portion 13 of the plastic bottle 10 to the outer edge portion 15a of the bottom portion 15 toward the sides between the vertexes 25a to 25h of the outer edge line portion 211 of the inclined portion 21. 16g and 16h are formed. Each of the cut surfaces 16 a to 16 h is a plane that extends from the lower portion of the body portion 13 to the outer edge line portion 211 of the inclined portion 21 through the outer edge portion 15 a of the bottom portion 15.

  In the initial state, the plastic bottle 10 having the structure as described above is in a state where the inclined portion 21 protrudes from the outer edge portion 15a of the bottom portion 15 and the movable portion 20 is pushed out, as shown in FIGS. (State of relatively large internal volume). In this state, for example, a content liquid such as a hot tea drink is filled. Then, after the cap 11 is wound around the mouth of the plastic bottle 10, the movable part 20 is pushed in to compensate for the decrease in the internal volume accompanying the cooling of the content liquid (becomes the state shown in FIG. 3).

  Next, a plastic bottle volume reducing method according to the first embodiment of the present invention for reducing the internal volume of the plastic bottle 10 having the above-described structure will be described.

  In this volume reduction method, as shown in FIG. 1, a rotating mechanism 100 including a driving source such as a motor and mechanical parts such as a speed reducer, and a push rod body having one end fixed to the rotating shaft of the rotating mechanism 100 110 is used. Then, the plastic bottle 10 is set at a predetermined position so that the bottom portion 15 where the movable portion 20 is pushed out faces the pushing mechanism. The holding mechanism for the plastic bottle 10 is not shown.

  In this state, the push rod body 110 is pivoted by the pivot mechanism 100, and the distal end portion of the push rod body 110 becomes the peripheral portion of the movable portion 20 formed on the bottom portion 15 of the plastic bottle 10 as shown in FIG. It contacts the inclined portion 21. When the push rod body 110 is further rotated, the outer edge line portion 211 and the inner edge line portion 212 of the inclined portion 21 in the vicinity of the contact portion are pressed while the contact portion of the inclined portion 21 with the push rod body 110 is pushed. As shown in FIG. 5, the movable part 20 is inclined and partially pushed in (first step).

  The push rod body 110 is further rotated, and the push rod body 110 is stopped in a state where the tip of the push rod body 110 faces the bottom center portion of the concave portion 23 in the movable portion 20 as shown in FIG. In this state, the entire pushing mechanism including the rotating mechanism 100 and the push rod body 110 is advanced toward the plastic bottle 10 as shown in FIG. 7 (for example, by a mechanism (not shown) such as a cylinder). As a result, the bottom central portion of the concave portion 23 located inside the inclined portion 21 of the movable portion 20 in a state where the movable portion 20 is inclined and partially pushed in is pushed by the distal end portion of the push rod body 110 that advances, and the movable portion 20 Is pushed in (second step).

  In this way, the movable portion 20 is completely pushed in (see FIG. 3 together with FIG. 7), the internal volume of the plastic bottle 10 is reduced, and the internal volume accompanying the cooling of the content liquid of the plastic bottle 10 is reduced. The decrease is compensated.

  According to the volume reduction method of the plastic bottle 10 as described above, the movable portion 20 that is pushed out at the bottom portion 15 of the plastic bottle 10 is not pushed in at a stretch, but the movable portion 20 is a peripheral portion thereof. When the inclined portion 21 is pushed, it is inclined and partially pushed in, and then the bottom center portion of the recess 23 is pushed and the remaining portion is pushed in, so that it is pushed in completely in two stages. For this reason, compared with the case where the movable part 20 is pushed in at a stretch, the force required to push in the movable part 20 in each stage can be reduced, and the pushing mechanism (the turning mechanism 100) is also relatively small. It can be.

  Further, even if the plastic bottle 10 has a relatively small capacity, the plastic bottle 10 can generate a relatively small pushing force by the push rod body 110 only by its own weight in a sealed state filled with the inner solution. The movable part 20 can be pushed in by being received without being lifted up as a whole. Therefore, when pushing in the movable part 20 of the plastic bottle 10 having a relatively small capacity in this way, a holding mechanism (not shown) that prevents the front and back and left and right from falling over without being supported from the top surface of the cap 11 or the like. There is no possibility that an unnecessary force is applied to the cap 11 to cause a sealing failure.

  Next, a plastic bottle volume reducing method according to the second embodiment of the present invention will be described.

  In the plastic bottle volume reducing method according to the second embodiment of the present invention, the first step is performed by the tip of the rotating push rod body 110 as in the case of the first embodiment described above. The inclined part 21 is pushed to incline the movable part 20 and partially push it in. In the subsequent second step, as shown in FIG. 8, the push rod body 110 is further rotated by the rotation mechanism 100, and the tip of the push rod body 110 is partially pushed into the movable portion 20. Pressing the inclined inner peripheral surface (which is the peripheral part of the movable part 20) of the concave part 23 which is in the shape of a mortar on the opposite side to the part pushed in the first step across the central part (the central part of the bottom of the concave part 23) I am doing so. In this way, when the inclined inner peripheral surface of the recess 23 is pushed by the tip of the rotating push rod 110, the force acting on the inclined inner peripheral surface causes the inclined portion 21 to be pushed out. The force toward the inside of the plastic bottle 10 acts, and the outer edge line portion 211 and the inner edge line portion 212 in the portion where the inclined portion 21 is pushed are bent, and as shown in FIG. The part is pushed in. In this way, the movable portion 20 is completely pushed in (see FIG. 3 together with FIG. 9), the internal volume of the plastic bottle 10 is reduced, and the internal volume accompanying the cooling of the content liquid in the plastic bottle 10 is reduced. The decrease is compensated.

  According to the volume reduction method of the plastic bottle according to the second embodiment, the movable portion 20 that is in the extruded state formed on the bottom portion 15 of the plastic bottle 10 is in two stages, as in the first embodiment. Since it can be completely pushed in, it is possible to reduce the force required to push in the movable part 20 at each stage as compared with the case where the movable part 20 is pushed in all at once. Further, since the movable portion 20 can be pushed in two stages only by a series of rotation operations of the push rod body 110, the pushing mechanism can be simplified.

  Furthermore, subsequently, a plastic bottle volume reducing method according to a third embodiment of the present invention will be described.

  In this volume reduction method, as shown in FIG. 10, the top surface 202 is inclined, a hollow portion 201 is formed inside, a cup-shaped push block 200 that can move forward and backward, and a bottom portion of the push block 200 is penetrated. Then, a push-in mechanism provided with a push rod body 210 that can be projected and retracted from the top surface 202 through the hollow portion 201 is used. Then, the plastic bottle 10 is set at a predetermined position so that the bottom portion 15 where the movable portion 20 is pushed out faces the top surface 202 of the push block 200 in the push-in mechanism. In this case also, the illustration of the holding mechanism for the plastic bottle 10 is omitted.

  In this state, the push block 200 is advanced toward the bottom portion 15 of the plastic bottle 10 together with the push rod body 210. Then, as shown in FIG. 11, the flat portion 22 of the movable portion 20 is partially pushed by the portion of the push block 200 that protrudes forward of the inclined top surface 202, and the inclined portion that continues to the pressed portion. The outer edge line portion 211 and the inner edge line portion 212 in the portion 21 are bent and the movable portion 20 is inclined and partially pushed in (first step).

  In this way, the push bar body 210 is advanced toward the bottom 15 of the plastic bottle 10 in a state where the movable part 20 is inclined and partially pushed by the push block 200, and the push bar is pushed from the top surface 202 of the push block 200. The body 210 protrudes, and as shown in FIG. 12, the bottom center portion of the concave portion 23 located inside the flat portion 22 of the movable portion 20 is pushed by the distal end portion of the push rod body 210 (second step). Thereby, the remaining part of the movable part 20 is pushed in.

  In this way, the movable portion 20 is completely pushed in (see FIG. 3 together with FIG. 12), the internal volume of the plastic bottle 10 is reduced, and the internal volume is reduced as the content liquid of the plastic bottle is cooled. Is compensated.

  According to the plastic bottle volume reducing method according to the third embodiment, the movable part 20 in the extruded state formed on the bottom part 15 of the plastic bottle 10 is 2 as in the first and second embodiments. Since it can be completely pushed in at each stage, the force required to push the movable part 20 at each stage can be reduced as compared with the case where the movable part 20 is pushed all at once. Further, in the first step, the flat portion 22 of the movable portion 20 is partially pushed by the inclined top surface 202 of the push block 200, so that the movable portion 20 can be moved by a simple operation of moving the push block 200 forward. It is possible to incline partly reliably by tilting.

  In each of the embodiments described above, the plastic bottle 10 in which the movable portion 20 is formed on the bottom portion 15 as shown in FIGS. 2 to 4 is particularly targeted for reducing the internal volume. The plastic bottle is not limited and can be applied to any shape as long as it is a plastic bottle having a movable part that can be extruded and pushed into the bottom.

  Further, the push rod bodies 110 and 210 and the push block 200 may be moved in a direction approaching and pushing up relative to the bottom portion 15 of the plastic bottle 10, and the plastic bottle 10 may be lowered.

  As described above, the method for reducing the volume of a plastic bottle according to the present invention has the effect of being able to push the movable part in a completely extruded state with a smaller force, and is formed at the bottom. The present invention is useful as a method for reducing the volume of a plastic bottle that can reduce the internal volume of a plastic bottle whose internal volume can be changed by expansion and contraction in the height direction by pushing and pushing a movable part.

It is a side view which shows the plastic bottle of the state set with respect to the pushing mechanism according to the volume reduction method of the plastic bottle which concerns on the 1st Embodiment of this invention. It is a partially notched side view which shows the lower part of the plastic bottle of the state by which the movable part of the bottom part was extruded. It is a partially notched side view which shows the lower part of the plastic bottle in the state where the movable part of the bottom part was pushed in. It is the perspective view which looked at the plastic bottle from the bottom part. It is a side view which shows the plastic bottle of the state by which the process of the 1st process was made | formed in the volume reduction method of the plastic bottle which concerns on the 1st Embodiment of this invention. It is a side view which shows the state of the plastic bottle and pushing mechanism at the time of transfering from the 1st process in the volume reduction method of the plastic bottle which concerns on the 1st Embodiment of this invention to a 2nd process. It is a side view which shows the plastic bottle of the state by which the process of the 2nd process was made | formed in the volume reduction method of the plastic bottle which concerns on the 1st Embodiment of this invention. It is a side view which shows the state of the plastic bottle and pushing mechanism at the time of transfering from the 1st process in the volume reduction method of the plastic bottle which concerns on the 2nd Embodiment of this invention to a 2nd process. It is a side view which shows the plastic bottle of the state by which the process of the 2nd process was made | formed in the volume reduction method of the plastic bottle which concerns on the 2nd Embodiment of this invention. It is a side view which shows the plastic bottle of the state set with respect to the pushing mechanism according to the volume reduction method of the plastic bottle which concerns on the 3rd Embodiment of this invention. It is a side view which shows the plastic bottle of the state by which the process of the 1st process was comprised in the volume reduction method of the plastic bottle which concerns on the 3rd Embodiment of this invention. It is a side view which shows the plastic bottle of the state by which the process of the 2nd process was made | formed in the volume reduction method of the plastic bottle which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Plastic bottle 11 Cap 12 Shoulder part 13 Body part 15 Bottom part 15a Outer edge part 16a-16h Cut surface 20 Movable part 21 Inclined part 211 Outer edge line part 212 Inner edge line part 22 Flat part 221 Boundary part 23 Recessed part 25a-25h Vertex 26a- 26h Vertex 27a to 27h V-shaped groove 100 Rotating mechanism 110 Push rod body 200 Push block 201 Hollow portion 202 Top surface 210 Push rod body

Claims (11)

Reduction of the plastic bottle that reduces the internal volume of the plastic bottle by pressing the movable part that is in the extruded state of the plastic bottle formed with the movable part that can be pushed out and pushed into the bottom formed following the body part It ’s a method,
A first step of pushing in a first part of the peripheral part of the movable part to incline the movable part and partially pushing it;
A method for reducing the volume of a plastic bottle, comprising: a second step of pushing a second part different from the first part of the inclined movable part and pushing the remaining part of the movable part.   The volume reducing method for a plastic bottle according to claim 1, wherein in the second step, a central part of the movable part is pushed as the second part.   2. The volume reduction of a plastic bottle according to claim 1, wherein the second step pushes a portion of the peripheral portion opposite to the first portion as the second portion across the central portion of the movable portion. Method. The movable part of the plastic bottle is
An annular inclined portion extending obliquely from the outer edge of the bottom,
A flat portion continuing inward of the annular inclined portion;
A concave portion having an inclined inner peripheral surface further inward from the flat portion,
The outer edge line part of the inclined part that becomes a boundary with the outer edge part of the bottom part, and the inner edge line part of the inclined part that becomes a boundary with the flat part can be bent in each direction of the push-in press,
In the first step, a predetermined part in either the inclined part or the flat part that is a peripheral part of the movable part is pushed as the first part,
2. The method for reducing the volume of a plastic bottle according to claim 1, wherein the second step pushes a predetermined portion of the concave portion of the stationary portion as the second portion.   5. The plastic bottle volume reduction method according to claim 4, wherein in the first step, a predetermined portion of the inclined portion is pushed as the first portion.   5. The plastic bottle volume reducing method according to claim 4, wherein in the first step, a predetermined portion of the flat portion is pushed as the first portion.   7. The plastic bottle volume reducing method according to claim 4, wherein the second step pushes a predetermined portion of the inclined inner peripheral surface of the concave portion as the second portion.   The volume reducing method for a plastic bottle according to any one of claims 4 to 6, wherein in the second step, a bottom center portion of the concave portion is pushed as the second portion. Using a mechanism with a push rod that can move forward and backward
In the first step, the push rod body is rotated and the predetermined portion of the inclined portion is pushed by the tip portion thereof,
5. The method for reducing the volume of a plastic bottle according to claim 4, wherein, in the second step, the push rod body is advanced and the bottom center portion of the recess is pushed while the rotation of the push rod body is stopped. . Using a mechanism with a rotatable push rod,
In the first step, the push rod body is rotated and the predetermined portion of the inclined portion is pushed by the tip portion thereof,
5. The plastic bottle volume reducing method according to claim 4, wherein in the second step, the push rod body is further rotated and a predetermined portion of the inclined inner peripheral surface of the concave portion is pushed by a tip portion thereof. Using a mechanism having a push block capable of moving forward and backward with an inclined top surface, and a push rod body capable of appearing and retracting from the top surface of the push block,
In the first step, the push block is advanced to push the flat portion following the inclined portion of the movable portion by the inclined top surface,
5. The plastic according to claim 4, wherein, in the second step, the push rod body is advanced from the top surface of the push block and the bottom center portion of the recess is pushed in a state where the push block is advanced. How to reduce the volume of the bottle.

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