JPH10180863A - Method and apparatus for curling deformed container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply curling treatment to the mouth part of a deformed container having a part of which the shape is other than a circular cross-sectional shape by using a curling roll. SOLUTION: When deformed containers 20 are moved along curling rolls 1, each container 20 is separated from the next container so as to be capable of being rotated independently to be rotated and transferred. Therefore, the pitch of the molding grooves of the curling rolls is set so that respective containers 20 are separated so as to set an interval preventing the mutual engagement of deformed parts 21. Therefore, by widening the interval between the containers subjected to curling treatment, the engagement of the deformed parts is prevented and, as a result, even the deformed containers are treated while rotated independently and curling treatment can be performed by a techique applied to a container having a circular cross section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for curling the mouth of a container, and more particularly to a method for curling a deformable container, particularly a deformable container made of synthetic resin.

[0002]

2. Description of the Related Art Conventionally, a method and an apparatus for curling a synthetic resin container in which a curling portion has been formed in advance by using a curling roll to curl the curling portion have been widely known (for example, Japanese Patent Publication No. 1-57555). Each of these conventional curling devices includes a plurality of containers that are placed side by side in a pile, and a spiral groove of a curling roll formed at a pitch substantially equal to the interval between the planned curling portions of adjacent containers in the stacked state. The mold is formed while rotating and moving.

[0003]

In the above-mentioned conventional apparatus, a container having a circular cross section can be curled. However, a deformable container, that is, a circular mouth having a circular cross section and a polygonal or elliptical cross section formed on a body. A container having a cross-sectional shape other than
Cannot be curled. That is, when a plurality of such deformed containers are stacked and the curling roll is transferred at the pitch of the curling scheduled portion, the stacked containers are locked to each other at a part other than the circular cross section of the trunk portion, so that the containers together with the container on the curling roll are The waiting container also attempts to rotate, and cannot be smoothly moved on the curling roll, and eventually, the curling of the deformed container cannot be performed by the conventional device.

[0004] In recent years, the shape of containers has been diversified,
Although the potential demand for deformed containers is increasing, containers whose mouth is not curled are difficult to use. Since there is a possibility that the mouth flange may cause injury, there is also a relationship with the PL method, and curling treatment is also strongly desired for deformable containers. Therefore, a curling method and apparatus that can respond to deformable containers are required. It is being done.

[0005]

According to a method of curling a deformable container according to the present invention, a plurality of containers having curled portions formed at their mouths are superposed one on another, and the laterally installed containers are sequentially rolled by a curling roll. In the curling step of rotating and transferring the curled portion by the spiral forming groove of the curling roll gradually narrowed in the feed direction, the next step is performed so that each container having a cross-section deformed portion can rotate independently. And transported by a curling roll after separating from the container. In the above, it is preferable that the interval between the containers that move the curling roll is the minimum interval at which each container can rotate independently, so that the next container can function as a guide for the first container (claim 2).

Claims 3 and 4 relate to an apparatus for carrying out the invention of claim 1 or 2. That is, a plurality of curling rolls are arranged on the same circumference to form a transfer path for the container, and the transfer path is formed at the container opening by a spiral forming groove formed in the curling roll while transferring the container. In the apparatus in which the curled portion is formed by curling, the forming groove has a pitch at which the deformed container having the cross-sectionally deformed portion can rotate independently. It is preferable that the maximum pitch of the molding grooves is a minimum interval at which each container can rotate independently. In addition, the pitch of the forming grooves is gradually widened in the feed direction, and the containers overlap and rotate on the base end side of the transfer path,
It is also possible to adopt a configuration in which it rotates independently on the tip side (claim 4). If a delivery device for delivering the leading container of the plurality of stacked containers to the transfer path is provided between the base end of the curling roll and the container standby position, the containers can be smoothly delivered. 5).

[0007]

According to the first aspect of the present invention, each container is separated from the next container so as to be able to rotate independently, and is rotated and transferred by a curling roll. Therefore, when a plurality of containers are transferred at intervals of about the pitch of the curling scheduled portion, even if the deformed containers are such that the cross-section deformed portions are locked together and rotate together, in this method, each container is independent. , And smoothly move along the curling roll to be curled. At this time, assuming that the interval between the containers for moving the curling rolls is the minimum interval at which each container can rotate independently, the front and rear containers are not completely separated from each other, and the bottom of the front container is positioned at the next position. In the mouth of the container. Therefore, the next container functions as a guide for preventing the front container from being violent, the transfer state is stabilized, and separation from the curling roll and disturbance of the curling process are prevented.

[0008] In the above invention, for example, the pitch of the spiral forming groove of the curling roll is increased so that the deformable containers can be rotated independently without locking each other. Can be implemented. When the pitch of the forming groove is small at the base end and wide at the front end side as in the invention of claim 4, the container on the curling roll and the container on standby rotate together at the base end, but are not formed. On the leading end side, it rotates independently. According to the invention of claim 5, the container can be sent out to the curling roll at a predetermined interval by the sending-out device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall view of an apparatus according to the present invention, in which a waiting station 2 for containers is provided at a base end of a curling roll 1 installed in a horizontal direction. A container feeding device 3 is provided between the roll 1 and the base end. The curling rolls 1 are arranged concentrically as a set of a plurality of (for example, three) rolls. A heater 9 is provided between the curling rolls at the base end (FIG. 3), and a holding roll 4 is provided at the tip end (FIG. 3). 4) Installed. In FIG. 1, reference numeral 7a denotes a guide tube of a container subjected to a curling process.

A spiral forming groove 5 is formed on the peripheral wall of the curling roll 1. The forming groove 5 is formed so that the curling portion of the container is locked so that the container can be curled while being transferred. The width gradually decreases toward the tip. Further, a heating device (not shown) for heating the portion to be curled of the container so as to be moldable is incorporated.

The pitch P of the forming grooves 5 of the curling roll 1 is a minimum pitch at which the deformable containers to be formed by this apparatus can rotate independently without locking each other. That is, when a deformed portion (a portion other than a circular cross section) 21 is formed on the body of the deformable container 20, the maximum diameter L of the container located inside as shown in FIG. If they overlap at a smaller relative position, the deformed portions are locked together and the containers in the transfer path must rotate together, which is not appropriate. On the other hand, if the maximum diameter L of the inner container overlaps at a relative position smaller than the minimum diameter 1 of the outer container as shown in FIG. 6, the bottom of the front container and the mouth of the next container are fitted, Since the parts are not locked to each other, they can be independently rotated.

The pitch of the forming grooves 5 of the curling roll 1 is equal pitch over the entire length, and the standby container 20 of the standby station 2 is sent out to the curling roll 1 by the feeding device 3. The feeding device includes a rotating claw 6 that is engaged with a curling portion 22 formed in a flange shape at the mouth of the container 20, peels off the plurality of stacked containers 20 one by one, and feeds the container 20 toward the curling roll 1. A guide tube 7 that covers the space between the leading container at the standby position and the base end of the curling roll 1, and a compressed air blowing device for transferring the container 20 peeled off by the rotating claw 6 to the curling roll 1 by air pressure 8.

In the apparatus configured as described above, a large number of containers 20 are placed side by side on the standby station 2 and the curling roll 1 and the holding roll 4 are rotated. Next, the rotating container 6 is rotated in synchronization with the timing of each rotation of the curling roll 1, and the first container 2 is put on standby.
The curled portion 22 of 0 was peeled off from the remaining container by being urged, and the gap between the container peeled off from the compressed air blowing device 8 and the remaining container was blown with compressed air to be peeled off. The container is sent out to the base end of the curling roll 1 through the guide tube 7. The sent out container 20 has the pre-curling portion 22 fitted into the forming groove 5, is transferred to the tip side of the curling roll 1 while rotating according to the rotation of the curling roll 1, and is curled by the forming groove 5.
Here, the pitch of the forming grooves 5 is such that the container can rotate independently, so that the container rotates without being affected by the rotation of the front and rear containers, and the rotational force of the container has an effect on the containers below the second order. I will not give. Further, in this embodiment, since the pitch of the forming groove 5 is set to the minimum pitch capable of independently rotating, the bottom of the previous container is fitted in the mouth of the next container. Therefore, the mouth 23 of the next container serves as a guide for restricting the movement of the bottom 24 of the front container, so that the container does not violate and the transfer state is stabilized.

In the above embodiment, the feeding device 3 between the container standby station 2 and the curling roll 1 is constituted by the rotating claw 6, the compressed air blowing device 7 and the guide cylinder 8
However, this sending device is a standby station 2
The container is not limited to the above configuration as long as the containers can be sent out one by one at an interval corresponding to the pitch of the forming groove of the curling roll 1. By devising the feeding posture of the container or the shape of the base end of the curling roll, it is conceivable that the feeding device can be configured with only the feeding claw. In the delivery device of FIG. 7, the rotary claw 6 has an arm-like configuration, and compressed air is blown from the compressed air blowout port 8 to the container, one of which has been peeled off by the rotary claw 6. Further, conventionally known delivery means can be appropriately employed.

[0015]

[Embodiment 2] FIG. 8 and subsequent figures show another embodiment. Here, the rollers 11 supporting the containers 20 that are stacked and placed horizontally are arranged in two rows in the container standby station 2 so that the containers on the standby station 2 can be smoothly rotated in the stacked state. It is.
Although a delivery device is additionally provided, it is omitted in the figure. On the other hand, the pitch of the spiral forming groove 5 formed in the curling roll 1 is narrow at the base end and gradually widened toward the front end, and at least in the part to be curled, the front and rear containers do not lock each other. , As a pitch that can be independently rotated.

In this embodiment, the containers 20 are sequentially sent out from the waiting station 2 to the curling roll 1 at predetermined intervals. Since the pitch of the forming grooves of the curling roll 1 is narrow at the base end, the front and rear containers are locked together at their deformed cross-sections and rotate together. This rotation is transmitted to the standby container of the standby station 2 and rotates together. However, since the roller 11 is installed in the rotation station 2, the standby container rotates with almost no load, and the curling roll 1 is rotated.
Does not hinder transfer of the upper container. Curling roll 1
Since the pitch of the forming grooves 5 gradually increases, the distance between the containers 20 to be transferred gradually increases, the locking of the deformed portions is released, and the containers 20 rotate independently. The container 20 rotates independently in a portion where the groove width of the forming groove 5 is narrowed and the curling process is performed.

[0017]

According to the present invention, the deformable containers arranged front and rear on the curling roll are placed at positions where they are not locked to each other,
Independently rotating, all the containers rotate together in the conventional device, and a large load is applied.Consequently, even for a deformed container that cannot be practically curled, continuous curling using a curling roll can be performed. it can. Therefore, curling of the deformed container can be performed at low cost, and there is an effect that a highly safe deformed container can be spread.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a curling roll installation portion.

FIG. 3 is a side view of the curling roll installation portion proximal end side.

FIG. 4 is a side view of the curling roll installation portion tip side.

FIG. 5 is a cross-sectional view of a container showing an improper overlapping state of containers.

FIG. 6 is a cross-sectional view of a container showing a preferred container in an overlapping state.

FIG. 7 is a front view showing another configuration of the delivery device.

FIG. 8 is a side view of a waiting station according to the second embodiment.

FIG. 9 is an enlarged cross-sectional view of a curling roll installation part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Curling roll 2 Standby station 3 Feeding device 4 Pressing roll 5 Molding groove 6 Rotating claw 7 Guide cylinder 8 Compressed air blowing device 11 Roller 20 Container 21 Deformation part 22 Curling scheduled part

Claims (5)

[Claims] 1. A plurality of containers having curling portions formed at their mouths are placed one on top of the other side by side, and the containers are sequentially rotated and transported by curling rolls, and the spirals of the curling rolls are formed gradually narrower in the feeding direction. In the curling step of curling the portion to be curled by the shape forming groove, the container is a deformed container having a cross-sectionally deformed portion, and each container is separated from the next container so as to be independently rotatable and rotated and transferred by a curling roll. Curing method for deformed container characterized by the following: 2. The container according to claim 1, wherein the distance between the containers transferred by the curling roll is a minimum distance at which each container can rotate independently, and the next container can function as a guide for the first container. Curling method of deformed container 3. A container transfer path is formed by arranging a plurality of curling rolls on the same circumference, and a container opening is formed by a spiral forming groove formed in the curling roll while transferring the container through the transfer path. A curling device for a deformed container, wherein the forming groove has a pitch at which a deformed container having a cross-sectionally deformed portion can rotate independently. 4. The pitch of the forming grooves is gradually widened in the feed direction, and the container does not independently rotate at the base end side of the transfer path but independently rotates at the distal end side of the transfer path. A curling device for a deformed container according to the description 5. A delivery device for delivering a leading container of a plurality of stacked containers to a transfer path between a base end portion of a curling roll and a container standby position.
Curling device for deformed container according to