JPS6348786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a cylindrical film by continuously drawing out a flat synthetic resin film from its rolled layer, overlapping both sides and sealing the film.
More specifically, it automatically detects the seam, end, etc. of the film drawn out from the rolled layer,
The present invention relates to a method of manufacturing a cylindrical film while controlling mechanical operations based on this.

In the production of cylindrical films, the seams of the film drawn out from the rolled layer not only form defective parts where the seals on both sides of the film are incomplete when the film is made into a cylindrical film, but also cause problems especially in the cylinder making equipment. It can get caught near the entrance and cause film running problems. Further, idle operation when the film of the wound layer body is exhausted not only results in wasted operating time but also causes equipment failure. especially,
For example, in the packaging of sausages, etc., where contents are filled into a cylindrical film and packaged in succession with the production of the cylindrical film, defects may occur due to seams during the production of the cylindrical film, trouble may occur when the film runs, etc. Furthermore, dry operation causes the equipment to become contaminated due to leakage of the contents to be filled. Therefore, in the past, in the manufacture of cylindrical films, especially in the manufacture of cylindrical films that are continuously filled and packaged with contents, mechanical operations are controlled based on the detection of film seams and terminal ends, and the above-mentioned problems are avoided. It has become essential to prevent the occurrence of

Conventionally, mechanical operation control based on the detection of seams and ends has been carried out by using a phototube detector to detect the seams of the film being drawn out from the roll, and by detecting the ends of the film with a limit switch. It is being done. To explain this in more detail, seam detection is performed when it becomes necessary to splice the films together to form a rolled layer.The film is spliced with a light-shielding tape to form a rolled layer, and then the film is manufactured into a cylindrical film. This is done by detecting this tape from a traveling film using a phototube detection device. The end of the film can be detected either by using a limit switch to detect when the end of the film comes off the wound layer and the film loses tension, or by moving the end of the film to the core of the wound layer. This is done by firmly fixing the film, interposing a dancer roll in the running of the film, and using a limit switch to detect the movement of the dancer roll due to the increase in tension when the film is fully pulled out. . When a seam or end is detected, the operation of the device is temporarily stopped, and when a seam is detected, the film is passed through the cylinder making device through the seam, and the end is detected. When a new winding layer is formed, the starting end of a new winding layer is connected to this terminal end.

However, in the above-mentioned conventional method, the following major problem has occurred, particularly regarding the detection of the terminal end. That is, when the terminal end is detected when the film loses tension, the tension in the film is lost, which may cause the cylinder to be misaligned or the film to come out of the running position. On the other hand, in the case of a method in which the end of the film is fixed to the core material of the wound layer body and the end of the film is detected from the increase in tension of the film when all the films are pulled out, the Tension fluctuations tend to cause malfunctions, and if, in order to prevent this, detection is performed only when there is a large increase in film tension, there is a drawback that the film is more likely to break. These conventional drawbacks are a major hindrance to efficient production that takes advantage of the high-speed performance of today's high-speed production of cylindrical films.

The above-mentioned drawbacks of the conventional method can be solved by detecting the terminal end, which is the cause thereof, by using another suitable method, but this method has the following major limitations. In other words, when a seam or end is detected, it is not only possible to simply stop the operation of the device as in the past, but also to perform different appropriate controls depending on the detected content to improve manufacturing efficiency. There is a strong demand for This means that it should not be. Under these constraints, a major technical challenge is to be able to easily and reliably detect the joint and end portion and control the mechanical operation without causing cylinder misalignment, film separation, film breakage, etc. It's summery.

An object of the present invention is to solve the above-mentioned technical problems and to make it possible to efficiently manufacture a cylindrical film by taking advantage of today's high-speed manufacturing.

The structural feature of the present invention for solving the above-mentioned technical problem is a method of drawing out a film from a rolled layer of flat synthetic resin film, overlapping and sealing both sides of this film to form a cylindrical film. In this method, two or more pairs of phototube detection devices with different sensitivities are arranged during the film travel process from the film withdrawal to the overlapping of both sides, and the difference in sensitivity of the phototube detection devices is used to detect the winding process in advance. Identification marks such as seams and film ends are detected by pasting two or more types of tape with different light transmittances on the film in the layer, and mechanical The present invention is a method for manufacturing a cylindrical film in which the operation is controlled.

In the present invention, for example, when detecting a joint and an end using two pairs of phototube detection devices with different sensitivities and two types of tapes with different light transmittances, only the highly sensitive phototube detection device Depending on whether the passage of a tape with high light transmittance is detected, or whether both phototube detection devices detect the passage of a tape with low light transmittance, the tape is an identification mark indicating a seam or an end. It is determined whether the mark is an identification mark, and it is possible to clearly distinguish and detect the seam and the end. In addition, since the tape serving as an identification mark can be pasted at any position on the film within the rolled layer, the end of the film can be detected while a certain amount of film remains on the rolled layer, and the film can be detected at any position. Since the mechanical operation can be controlled while maintaining the tension during normal operation, it is possible to prevent cylinder misalignment, film detachment, and film breakage when detecting the terminal end. Furthermore, in the present invention, since both the seam and the termination are detected by the phototube detection device, there is no need to prepare separate detection devices for the detection of the seam and the termination, which is extremely streamlined. It is something like that.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to drawings showing one embodiment of the present invention.

FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

In the figure, 1a is a winding body in use, and 1b is a winding body for replacement, on which translucent synthetic resin films 2a and 2b are wound.

The film 2a pulled out from the rolled layered body 1a is
The light is sent to the cylinder making device 4 through two pairs of phototube detection devices 3a and 3b each consisting of a light projector and a light receiver. The film 2a that has been drawn into the cylinder making device 4 is rolled up in the width direction, and is rolled up by a high frequency positive electrode 5 located on the outside and a high frequency negative electrode 7 provided on the outer periphery of the nozzle 6 located on the inside. Then, the overlapped both sides are sealed to form a cylindrical film. The cylindrical film thus produced is filled with the contents 8 directly from the nozzle 6 and is continuously packaged.

The two pairs of phototube detection devices 3a and 3b have different sensitivities, and for convenience of explanation, the phototube detection device 3a on the upstream side will be described as having high sensitivity, and the phototube detection device 3b on the downstream side will be described as having low sensitivity. .

As shown in FIG. 2, tapes 9a and 9b are placed on the films 2a and 2b of the wound layers 1a and 1b as identification marks at the seam and end portions, respectively.
are pasted at appropriate positions in advance. The tapes 9a and 9b have different light transmittances, and depending on the sensitivity of the phototube detection devices 3a and 3b, the tape 9a has a relatively high light transmittance, and the tape 9b has a relatively low light transmittance. It is becoming.
That is, the tape 9a has a light transmittance in such a range that its passage can be detected by the high-sensitivity phototube detection device 3a but cannot be detected by the low-sensitivity phototube detection device 3b, and the tape 9b has a light transmittance that can be detected by the high-sensitivity phototube detection device 3a, but not by the low-sensitivity phototube detection device 3b. ，
3b has a light transmittance within a range that allows its passage to be detected.

When the tape 9a or 9b of the film 2a is pulled out from the rolled layer 1a in use and travels to the position of the phototube detection devices 3a, 3b, if the tape 9a has a high light transmittance, the tape 9a has a high light transmittance. The sensitive phototube detection device 3a outputs a detection signal, but since the low sensitivity phototube detection device 3b cannot detect the tape 9a, no detection signal is generated. Furthermore, in the case of tape 9b having low light transmittance, detection signals are output from both phototube detection devices 3a and 3b. Therefore, if one of the tapes 9a and 9b is used as an identification mark for the joint part and the other as an identification mark for the end part, a detection signal will be output from only the phototube detection device 3a or a detection signal will be output from both phototube detection devices 3a and 3b. Depending on the method, the joint portion and the end portion can be reliably detected separately, and the mechanical operation can be easily controlled separately for the joint portion and the end portion.

When the phototube detection devices 3a and 3b detect the seam in the traveling film 2a as described above, the traveling of the film 2a is stopped and the supply of the content 8 from the nozzle 6 is also stopped. A message indicating that a seam has been detected is displayed.
In this case, the operation may be resumed after the film 2a is fed through a manual tube and the detected seam is fed out from the cylinder making device 4.

On the other hand, when the terminal end of the film 2a is detected by the phototube detection devices 3a and 3b, the end of the film 2a is detected.
a and the supply of the contents 8 from the nozzle 6 are stopped. At the same time, the starting end of the film 2b that has been pulled out from the unused rolled layer body 1b and lined up with the film 2a is connected to the pair of connecting devices 1.
0 is connected to the rear end of the film 2a by tilting.

At this time, since the tapes 9a and 9b can be pasted onto the film at any position on the wound layer 1a, a certain amount of the film 2a is removed before the film 2a is all pulled out from the wound layer 1a. By making sure that the tape 9a or 9b, which is the identification mark at the end, is detected by the phototube detection device while remaining as the rolled layer 1a, the film 2a has the same tension as during normal operation. Detection of the terminal end and film 2 of film 2b
A connection can be made to a. Therefore, there is no fear that the tension of the film 2a will fluctuate when detecting the terminal end, causing the film 2a to move away from a predetermined running position or be cut.Since the film 2a has an appropriate tension, the film 2b can be Connection is also easy. Further, the bonding position of the tape 9a or 9b, which is the identification mark at the end portion described above, is the same for the rolled layered body 1b.

The film 2b may be connected to the film 2a using an adhesive tape or the like while the film 2a is not running. However, it is preferable to use welding rather than using adhesive tape because the connected portion can pass through the cylinder making device 4 more easily. In particular, since the seals on both sides of the films 2a and 2b when used as cylindrical films are usually achieved by high-frequency welding, as shown in FIG. It is advantageous if the high-frequency welding device 10 also uses the electrodes 5 and 7 for high-frequency welding in the cylinder making device 4 and an oscillator (not shown) in common. Further, when the terminal end is detected, if the connecting device 10 is moved and tilted in synchronization with the running of the film 2a while the film 2a is running,
It is also possible to replace the wound layer body 1a with the wound layer body 1b without stopping the apparatus at all.

After connecting the starting end of the film 2b to the ending end of the film 2a as described above, the cutter 11a is operated to cut the film 2a.
The film 2b is sent from the rolled layer body 1b to the cylinder making device 4 instead of film a. The connecting portion between the terminal end of the film 2a and the starting end of the film 2b is connected to the cylinder making device 4.
All you have to do is let it fly until it passes through. In addition, the used rolled layered body 1a is replaced with a new one,
The film pulled out from there is set in a position where it can be easily connected to the film 2b using the connecting device 10. In this way, the film 2b pulled out from the rolled layered body 1b is made into a cylindrical film, and the seam and the end are detected in the same way and the mechanical operation is controlled based on the detection, and this process is repeated sequentially. Become. Note that 11b is a cutter for cutting the film 2b when the trailing end of the film 2b is detected and the starting end of a new film is connected to the trailing end of the film 2b.

The film to be made into a cylindrical film by the method of the present invention may be any film as long as it has translucency.
If the light transmittance is low, it will not be possible to make a large difference in the light transmittance of the tape used as an identification mark.
Since this may cause malfunction, a colorless transparent or colored transparent film with relatively high light transmittance is preferable.
As the tape for the identification mark, commercially available adhesive tapes such as cellophane tape and vinyl tape can be used as they are, but other synthetic resin films or film-like materials can be cut into strips and attached to the film with adhesive. You may also use it. In particular, commercially available vinyl tapes have different light transmittances depending on their color, and are advantageous because they can be bonded without using adhesives.

Three or more pairs of phototube detection devices having different sensitivities may be provided. In this case, it is also possible to use three or more types of tapes with different light transmittances and include identification marks at areas other than the seam and end portions, thereby controlling the mechanical operation. For example, if a tape is pasted on the film in the rolled layer body corresponding to the required manufacturing length of the cylindrical film, the movement will be automatically started when the manufacturing of the cylindrical film of a certain length is completed. It can also be stopped. In addition, two or more pairs of phototube detection devices with the same sensitivity can be installed to ensure accurate detection and control even if one of the phototube detection devices fails, and all phototube detection devices can output detection signals. It is also possible to prevent malfunctions by performing control when this occurs. In addition, the phototube detection device can be installed at an appropriate position between the time when the film is pulled out from the rolled layer body and the entrance of the tube-making device that overlaps both sides of the film, taking into account the time difference until the control is activated. They can often be arranged in the direction of film travel, or
They may be arranged in a direction perpendicular to the running direction of the film.

Next, a preferred method of pasting tape used as an identification mark will be explained with reference to FIG.

As shown in FIG. 3, the rolled layer 1 normally used for manufacturing a cylindrical film has a film 2 pulled out from a wide raw roll 12 and cut into a cutter 1.
By cutting it to the appropriate width in step 3 and winding it up,
Multiple products are manufactured at the same time. Therefore, if the tape 9 is pasted over the entire width of the film 2 at the joints, ends, etc. of the film 2 on the upstream side of the cutter 13 when manufacturing the film 2, a plurality of windings can be made at the same time. A tape 9 as an identification mark can be attached to the layer 1.

If the tape is pasted onto the film in the winding layer as described above, tape can be pasted on a plurality of winding layers at once, and the tape can be pasted on each winding layer. Since there is no need to perform any additional work, it becomes extremely easy to attach the tape. Furthermore, according to the above-mentioned method, since the tape is pasted over the entire width of the film of each wound layer, as in the case where the tape is pasted to a part of the film in the width direction,
Another advantage is that there is no need for strict alignment between the phototube detection device and the tape. In the method of the present invention, as mentioned above, the sensitivity of the phototube detection device and the light transmittance of the tape are differentiated, and the content of the tape serving as an identification mark is determined based on this difference, so that all Even if the tape is passed between the phototube detection devices, there is no risk of malfunction.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the method for producing a cylindrical film according to the present invention, FIG. 2 is a plan view showing the state of tape attachment, and FIG. 3 is a preferred attachment of the tape used as an identification mark. It is an explanatory diagram of a method. 1a, 1b, 1: Wound layer body, 2a, 2b, 2: Film, 3a, 3b: Phototube detection device, 4: Cylinder making device, 5: High frequency positive electrode, 6: Nozzle, 7: High frequency negative electrode, 8: Contents, 9a, 9b, 9: tape, 10: connecting device, 11a, 11b, 13: cutter, 12: raw fabric roll.

Claims (1)

[Claims] 1. In a method of pulling out a film from a flat wound layer of synthetic resin film, overlapping and sealing both sides of the film to form a cylindrical film, the running of the film from the pulling out of the film to the overlapping of both sides. Two or more pairs of phototube detection devices with different sensitivities are arranged in the process, and depending on the difference in sensitivity of the phototube detection devices, two or more types of phototube detection devices with different light transmittances are placed on the film in the wound layer in advance. A method for manufacturing a cylindrical film, characterized by detecting identification marks such as seams and end edges of the film shown by pasting tape together, and controlling mechanical operations in accordance with the identified contents. .