JPH0520290B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for centering the bottom of a synthetic resin tube container to be hermetically sealed. The purpose of this is to prevent the occurrence of defective products due to misalignment.

[Conventional technology]

A synthetic resin tube container is filled with the contents from the open bottom in an inverted position, and then the open bottom is flattened and sealed by welding to complete the container form. At the same time, the contents can be stored.

Therefore, the synthetic resin tube container is transported in an upright position to the filling device for filling the contents, and then transported as it is to the sealing device, where the open bottom is flattened and flattened. The molding process involves welding and sealing.

When this tube container is welded and sealed at the bottom using a sealing device, it is first flattened by a pair of chucks and then welded and sealed by a welding jig. Since the bottom has a constant thickness and shape, a mold surface with a constant size and shape is formed on the contact surface of the sealing device with the bottom of the welding jig.

Therefore, it was necessary for the flattened bottom to be positioned in exact alignment with the mold surface of this welding jig.

In order to meet this requirement, conventionally, a holder that holds the tube container in an inverted position holds the tube container immovably, and this holder stops accurately at the sealing position, thereby aligning the tube container with respect to the sealing device. A method was taken to achieve this.

[Problem that the invention seeks to solve]

However, holding the tube by the holder cannot always be achieved accurately;
Furthermore, even if the holder holds the tube container accurately, if there is a slight deformation in the tube container itself, the center position of the bottom of the tube container will be largely displaced from the center position of the sealing position. Centering for the sealing device was never satisfactory.

As described above, in the conventional method, it was not always possible to align the bottom of the tube container with the center position of the sealing device, so it was not always possible to align the bottom of the tube container with the center position of the sealing device. It was supposed to cause defects and other inconveniences.

[Means and actions for solving problems]

The present invention was devised to solve the above-mentioned conventional problems and inconveniences, and it is possible to accurately and reliably center the bottom with respect to the sealing device by directly regulating the position of the bottom with respect to the sealing device. It was designed to be achieved.

Hereinafter, the centering method according to the present invention will be explained with reference to the drawings.

In the method for centering a tube container according to the present invention, prior to hermetically sealing the open bottom portion 2 of the tube container 1 made of synthetic resin,
A method of aligning the central axis of the sealing device with the central axis M of the sealing device to position it, the open bottom portion 2 being completely flattened from the front and rear directions by a pair of chucks 3 of the sealing device. Before being crushed, in this open bottom part 2, at least the width along the flat direction of the bottom part 2 to be flattened is set to a value larger than the inner diameter of the bottom part 2, and the tip is tapered. A wedge 4, which has a flat plate shape and is movable along the central axis M of the sealing device with its central axis coincident with the central axis M of the sealing device, is placed in the intrusion position, thereby sealing the bottom portion 2. The wedge 4 is removed from the bottom 2 immediately before the bottom 2 is completely flattened by the pair of chucks 3 of the sealing device by regulating its position relative to the device.

That is, the open bottom 2 of the tube container 1, which has been filled with the contents from the filling device and held in the holder 5 in an inverted position and moved to the sealing position, is flattened completely by the pair of chucks 3. Before crushing, a wedge 4 is inserted into the open bottom 2, and the inserted position of the wedge 4 accurately positions and regulates the position of the bottom 2 with respect to the sealing device, and this positioning is regulated. By completely flattening the bottom part 2 from the front and rear directions by the pair of chucks 3 of the sealing device, the opened bottom part 2 is pressed flat while being accurately and reliably positioned with respect to the sealing device. This means that it can be destroyed.

〔Example〕

In the case of the illustrated embodiment, the wedge 4 has a shape in which the lower end of the flat plate is tapered downward into a pointed shape so that it can easily penetrate into the open bottom part 2, and the wedge 4 has a flat plate shape. The width of the bent main body portion, that is, the width along the flat direction of the open bottom portion 2 is:
It is set to a value equal to the inner diameter width in the flat direction when the open bottom portion 2 is flattened to some extent.

Therefore, the tube container 1 stopped at a predetermined position
When the wedge 4 is inserted into the open bottom 2, the bottom 2 is deformed into a flattened shape due to the inserted position of the wedge 4. The direction of the flattening deformation of the bottom portion 2 by the chuck 3 is exactly the same.

This entry of the wedge 4 into the bottom portion 2 may be performed prior to the flattening of the bottom portion 2 by the chuck 3, or may be performed during the flattening of the bottom portion 2 by the chuck 3; It is sufficient if the separation from the bottom part 2 can be carried out before the bottom part 2 is completely flattened by the pair of chucks 3.

〔Effect of the invention〕

As described above, the method for centering a synthetic resin tube container according to the present invention directly achieves centering of the bottom part 2 of the tube container 1 by the wedge 4 assembled on the sealing device side. There is no fear of misalignment due to the assembly positional relationship of the tube container 1 or deformation of the tube container 1 itself, and it is possible to always accurately center the bottom portion 2.

Furthermore, since the centering of the bottom part 2 is achieved by mechanical means using the wedge 4, the centering is achieved reliably and with simple operation, and furthermore, the apparatus for carrying out this method can also be achieved. It can be made simple.

Furthermore, until the bottom part 2 is clamped and held by the pair of chucks 3, the bottom part 2 is held by the wedge 4.
Therefore, even if the tube container 1 tries to move due to vibration etc., the bottom part 2 to be hermetically sealed can be reliably held immovably with respect to the sealing device. Sealing operations can be accomplished safely.

As is clear from the above description, the method for centering a tube container according to the present invention can reliably, accurately and safely achieve centering of the bottom of the tube container with respect to the sealing device, and thereby create a hermetic seal. This method does not cause any inconveniences such as poor sealing or poor molding of the bottom seal portion, and it exhibits many excellent effects such as being easier and safer to implement.

[Brief explanation of the drawing]

The drawing is a perspective view showing the arrangement of the main parts for explaining the method of the present invention. Explanation of symbols: 1; tube container; 2; bottom;
3; Chuck, 4; Wedge, 5; Holder, M;
central axis.

Claims (1)

[Claims] 1. A method of positioning the open bottom of a synthetic resin tube container by aligning the central axis of the bottom of the tube container accurately with the center axis of the sealing device, before sealing the open bottom of the tube container made of synthetic resin. , before the open bottom of the tube container is completely flattened by the pair of chucks of the sealing device, at least along the flattening direction of the bottom to be flattened is inserted into the open bottom. The width of the pipe is set to be larger than the inner diameter of the bottom part, and it has a flat plate shape with a tapered tip, and further, the central axis is aligned with the central axis of the sealing device, and it moves along the central axis of the sealing device. A removably provided wedge is placed in an intrusive position, thereby regulating the position of the bottom with respect to the sealing device, and immediately before complete flattening of the bottom by the pair of chucks of the sealing device is achieved. A method for centering a tube container in which a wedge is removed from the bottom.