JPS6050650B2 - Printing method for packaging machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing alignment method for preventing misalignment between the container and the printed top lid when sealing the printed top lid onto the container body using a film sealing machine or the like. .

In the process of forming a container on a band-shaped film at predetermined intervals and filling it with the contents, combining the band-shaped top lid film with marks printed at the same intervals as the forming interval of the container vertically and sealing the top lid. Slight stretching of the film causes misalignment between the films, and the amount of misalignment gradually increases, often resulting in misalignment between the container and the mark print.

Conventional means to deal with such inconveniences include detecting the position of the printing mark in advance and increasing or decreasing the feeding of the container film in accordance with this interval, or applying tension to the top cover film to stretch it. This has led to methods of correcting the deviation. However, among these conventional methods, the method of adjusting the feed of the container film requires a structure to correct this, since fluctuations in the feed stroke are directly affected in the downstream process, causing the punching position to be out of alignment. However, the disadvantage was that the device was complicated.

In addition, in the case of the method of stretching the top lid seal, there is a problem with the material of the seal, and there is a drawback that it cannot be applied at all to hard films that do not stretch, such as aluminum foil. It is an object of the present invention to eliminate such drawbacks in the prior art and to provide a printing and alignment method that can be applied to any material film.

As shown in Fig. 1, the working process of this type of packaging machine is that J film for container forming (hereinafter referred to as container film) a fed out from a supply device 1 is first heated in a heating device 2, and then formed. The container b is pressure-molded in the device 3, and then the filling device 4 fills the container with the contents and sends it to the sealing device 6.

On the other hand, the film that serves as the top lid (hereinafter referred to as the top lid film)
c is the sealing device 6 fed out from another supply device 5;
It is combined with the container film a in front of the container film a, and is fed into the sealing device 6, where the upper opening is sealed. Thereafter, they are punched out one by one or in sets of several by the punching device 7, and are dropped onto the take-out conveyor 8 and transferred to the next process.
Further, the film after punching becomes a scrap film and is wound up by a winding device 9. In the method of the present invention, the marks printed on the top cover film c are set at a predetermined pitch, which will be described later, and a detector 10 for detecting the marks on the top cover film being transferred is installed in front of the sealing device 6.

Furthermore, a cylinder device 11 is provided at the exit end of the sealing device 6 for applying pressure to the film, and this cylinder device 11 is actuated by a detection signal from the detector 10. Now, in the method of the present invention,
When forming the container b on the container film a in the forming apparatus 3, a groove d is formed in the width direction of the film at an intermediate position between each container, as shown in FIGS. 2 and 3. On the other hand, the pitch P2 of the printing marks on the top cover film c is set slightly larger than the pitch P1 of the containers on the container film (P2>P1). As shown in FIG. 4, the cylinder device 11 attached to the sealing device has a push-out plate 111 having a tip shape capable of fitting into the groove d formed in the container film, which can be vertically raised and lowered by a guide plate 112. The extrusion plate 111 is raised and lowered by the operation of the cylinder 113, as shown in FIG.
It is arranged at such a position that it can fit into the groove d of the container film when it is lowered. The process of working according to the method of the present invention is as follows.

The container film a, in which the container b and the groove d are formed simultaneously in the forming device 3, is produced by the filling device! 4 and then sent to a sealing device 6. The other top cover film c is also combined with the top of the container film a before the sealing device and fed into the sealing device 6, but when it passes a position slightly before being combined, it is printed by the detector 10. The pitch of the mark is detected. As described above, since the printing pitch P2 is slightly larger than the pitch P1 of the containers, there is no shift toward the downstream side with respect to the container b, but there is a tendency to shift toward the upstream side.

This state of deviation is constantly detected by the detector 10, and the detection signal is input to the cylinder of the cylinder device 11. Therefore, when the container to be sealed stops at a predetermined position of the sealing device 6, the cylinder device 11 is actuated by the detection signal, and the push-out plate 111 is lowered and comes into contact with the upper lid film c, and the upper lid is closed. Push a small amount of film into the groove d. By adjusting the movement of the top cover film by a slight amount, the container b and the printed mark are aligned, and the top cover sealing is performed at this point. The sealing device only needs to seal a certain area around the opening of the container, and the area around the groove d does not need to be sealed. do not have. In the above embodiment, a cylinder is used as a device for adjusting the feeding amount of the top cover, but the device is not limited to the cylinder, and the setting position can also be changed.
It may be provided separately from the sealing device.

According to the method of the present invention, printing misalignment on the container is corrected by finely adjusting the feeding amount of the top film in response to the detection signal of the pitch of the top film. It can be applied regardless of the situation, and the correction is simple and reliable.

Furthermore, since the configuration of the device is not complicated, maintenance is easy.

[Brief explanation of drawings]

FIG. 1 is a drawing schematically showing the packaging process according to the method of the present invention;
FIG. 2 is a side view showing the molding form of the container film, FIG. 3 is a top view of FIG. 2, FIG. 4 is a perspective view of the cylinder device according to the method of the present invention, and FIG. 5 is the cylinder device of FIG. 4. It is a partial explanatory view of a sealing process section having a 2: heating device, 3: molding device, 4: filling device, 6: sealing device, 7: punching device, 10: detector, 11: cylinder device, a: container film, b: container, c: top lid film, d: Groove.

Claims (1)

[Claims] 1. Printing in a packaging machine configured to transport the container film in the order of a heating process, a forming process, and a filling process, and then combine the container film with the top lid film transferred from a separate route to obtain a product through a sealing process and a punching process. In the alignment method, the printing pitch printed on the top lid film is set slightly larger than the molding pitch of the container, and in the molding step, a groove is formed in the width direction of the film at a position between the containers,
A shift detector is installed at a position before introduction into the sealing process to detect a shift in the printing position of the top cover film, and a shift corresponding to the shift of the top cover film is applied to the groove based on a shift detection signal from the shift detector. A printing alignment method in a packaging machine characterized by adjusting the feed amount by pushing.