JPH0818634B2 - How to judge whether the cap is tight - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for determining whether or not a mounted state of a cap wound around a mouth of a container body is good, and particularly suitable for a plastic cap. Regarding the method.

"Prior art and its problems" As a cap for sealing a container, there are a metal cap that has been widely used in the past and a plastic cap that is being adopted in recent years.

When these caps are wrapped around the mouth of the container body,
It is necessary to check whether the adhered state is good or bad, and to select if it is bad.

In the case of the metal cap, after the cap is put on the mouth of the container body, the screw 1 is rolled on the shell part and the side seal part 2 is narrowed down as shown in FIG. By controlling the depth d of the screw 1 and the narrowing depth h of the side seal portion 2, it was possible to control the quality of the wound state.

However, in the case of the plastic cap, as shown in FIG. 3, the screw 3 and the side seal portion 4 are formed in advance on the inner surface thereof, and the tightened state is managed as in the case of the metal cap. Can not.

Therefore, in preparation for future large-scale adoption of plastic caps, there is a demand for establishment of a quality determination method for the winding tightened state that can immediately determine the quality of the wound tightened state in the capping process.

"Object of the Invention" The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for determining a winding state that can immediately determine the quality of the winding state of a plastic cap in a capping process.

"Means for Solving Problems" A container body having a screw formed on the outer periphery of the upper end of the mouth and a flange provided on the neck is supported by the flange, and a screw is formed on the inner surface of the mouth. A method for determining the quality of the closed state of the cap when the plastic cap is tightened, the neck supporting the flange of the container body of a capping machine for tightening the cap around the mouth of the container body. With the non-contact type sensor provided on the support, the case where the height from the flange of the container body to the predetermined portion of the cap wound around the mouth of the container body is equal to or higher than the predetermined height is determined to be defective. And achieved the above objective.

[Operation] When a plastic cap with a screw formed on the inner surface is screwed to the container mouth, the inner surface of the cap will not contact the container body mouth when the cap screw properly engages with the container mouth screw. It goes down with winding up to the position where it abuts the upper sealing surface. That is, if the position of the cap is below the predetermined position, the cap comes into contact with the upper seal surface of the container body opening portion to sufficiently seal the container body opening portion.

Therefore, if the predetermined portion of the cap is lower than the predetermined height, it can be determined that the cap is in close contact with the sealing surface of the opening of the container body, so that the "winding state is good".

On the other hand, if the predetermined portion of the cap is higher than the predetermined height, it is expected that there is a gap between the cap and the sealing surface of the mouth of the container body. To be done.

"Embodiment" FIG. 1 shows an example of an apparatus suitable for carrying out the method for determining the quality of a cap-wound state according to the present invention, in which reference numeral 11 denotes a container body.

This container body 11 is made of polyethylene terephthalate (PE
It is made of plastic such as T), and its neck 12 is provided with a flange 13 used to hold the container body 11 during capping. And this container body 11 is
The flange 13 is supported on the neck support 14 of the capping machine.

The neck support 14 has a light emitting element 15 with high directivity.
A sensor including the light receiving element 16 and the light receiving element 16 is provided. This sensor is a cap 17 attached to the mouth of the container body 11.
When the ceiling surface 20 of the above is higher than a predetermined height, it is installed at such a height that the light from the light emitting element 15 is blocked and does not enter the light receiving element 16.

Next, a method for determining the quality of the cap winding state implemented by this device will be described.

First, the container body 11 filled with the content liquid through the filling machine 11
Are transported to the capping machine. Then, the container body 11 conveyed to the capping machine is held by the flange 13 of the container body 11 engaging with the neck support 14 of the capping machine. In this state, a plastic cap 17 is attached to the mouth of the container body 11 from the cap feed device. Then, the cap 17 is screwed into the opening of the container body 11 by the head 22 that has descended.

When the winding of the cap 17 is completed in this manner, the head 22 moves up and separates from the cap 17.

In this state, if the light receiving element 16 can receive the light from the light emitting element 15 provided in the neck support 14, it is determined that the cap 17 is wound to an appropriate depth.
On the contrary, when the light from the light emitting element 15 cannot be received by the light receiving element 16, the cap 17 is not wound up to an appropriate depth, that is, the sealing surface 23 (the upper end surface in this example at the upper portion of the mouth of the container body 11). It is determined that the cap 17 is not wound up to the position at which the cap 17 is pressed against.

Then, the containers determined as described above are sorted by an appropriate sorting mechanism, and only the containers determined to be in the good winding state are conveyed to the next step.

According to such a method for determining whether the winding state is good or bad, the quality of the winding state is determined by whether or not the light emitted from the light emitting element 15 can be received by the light receiving element 16, so that the determination can be made immediately and accurately. Can be defeated.

Further, in the determination method of this example, the height of the top surface 20 of the cap 17 is measured from the flange 13 of the container body 11, so that a more accurate determination can be made. That is, the position at which the flange 13 of the container body 11 is provided is highly accurately controlled by the dimension from the upper end surface that is the sealing surface 23 of the mouth of the container body 11, and therefore the dimension of the container body 11 is determined. Has little influence on the determination of the tightening state of the cap 17. Therefore, the variation in the height of the top surface of the cap 17 that is properly wound around the container body 11 is small, and the height that determines the quality of the wound state can be set more appropriately, and a more accurate determination can be made. It will be possible.

Further, in the determination method of this example, the neck support is provided with the sensor including the light emitting element 15 and the light receiving element 16, so that there is an advantage that it is possible to immediately determine the quality of the tightened state of the cap 17 in the capping machine. .

The method for determining the quality of the wound state of the present invention is not limited to the above embodiment.

For example, in the above embodiment, the "predetermined portion" of the cap 17
Although the top surface 20 of the cap 17 is used as the above, the lower end surface 21 of the cap 17 may be used, or an appropriate protrusion may be provided on the outer periphery of the cap to be used.

Further, the height of the predetermined portion of the cap 17 which has been wound up is
It can also be measured from a place other than the flange 13 such as the bottom of the container body 11.

Further, in order to detect the height of the predetermined portion of the cap 17 that has been wound and tightened, a means other than the sensor provided on the neck support of the capping machine can be used. For example, means such as providing a light receiving element and a light emitting element between the center post of the capping machine and the guide, or providing a micro switch for detecting the height of a predetermined portion of the cap 17 at an appropriate position can be adopted.

Further, in order to detect the height of a predetermined portion of the cap 17,
It is also possible to use a distance sensor such as an ultrasonic sensor.

[Effect of the Invention] As described above, according to the method for determining the quality of the cap tightening state of the present invention, when the height of the predetermined portion of the cap that has been tightened is equal to or higher than the predetermined height, it is regarded as defective and Since the quality is managed, it is immediately determined whether the cap is in contact with the sealing surface of the container body opening to sufficiently seal the container body opening, that is, whether the cap is tightly wound or not. Moreover, it can be accurately determined.

Therefore, according to the determination method of the present invention, it is possible to immediately determine whether the winding state of the plastic cap is good or bad even in the capping step.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an example of an apparatus for carrying out the quality determination method of a cap tightening state of the present invention, and FIG. 2 shows a state when a metallic cap is wound around a mouth of a container body. FIG. 3 is a partial sectional view showing an example of a general plastic cap. 11 …… Container body, 13 …… Flange, 14 …… Neck support, 15 …… Light emitting element, 16 …… Light receiving element, 17 …… Cap, 20 …… Top surface.

Claims (3)

[Claims] 1. A plastic cap having a screw formed on the outer periphery of the upper end of a mouth and a container main body having a flange provided on the neck is supported by the flange, and a screw is formed on the inner surface of the mouth. Is a method for determining the quality of the winding state of the cap when winding, the capping machine for winding the cap around the mouth of the container body, a non-support provided on the neck support that supports the flange of the container body. A cap winding characterized by a contact type sensor that determines that the height from the flange of the container body to a predetermined portion of the cap fastened to the mouth of the container body is equal to or higher than a predetermined height as a defect. How to judge the quality of tightened state. 2. The method for determining the quality of a cap tightened state according to claim 1, wherein the predetermined portion of the cap is a top surface of the cap. 3. A method for determining the quality of a cap tightened state according to claim 1, wherein the predetermined portion of the cap is a lower end surface of the cap.