JPS6355027A - Extension method of beltlike film by high-frequency heating welding - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improved method for replenishing film strips, for example, for continuously supplying film strips corresponding to the original film in an automatic bag making/filling and packaging machine. .

[Conventional technology]

2. Description of the Related Art Apparatuses for automatically and continuously manufacturing packaging bodies of specified dimensions from long strip-like films of thermoplastic synthetic resin are widely used.

For example, ADP (product name, manufactured by Asahi Kasei@, automatic packaging)
etc. are the same type of packaging machines, and the structure and function thereof are detailed in, for example, Japanese Patent Laid-Open No. 171312/1983.

A problem that has recently attracted particular attention with this type of packaging machine is the continuous supply of a strip of film that corresponds to the original film. This strip-shaped film is generally supplied in the form of a rolled layer made of a regulated long material, and the rolled layer is replaced one after another. The number of people required to perform the switching and adjustment work, which includes the series of operations from replacement to removal of the package containing the contents, is required each time the rolled layer is replaced. This means that the amount of loss in terms of time and resources can no longer be ignored.

As the capacity of the packaging machine increases by two or three times the speed of the previous film, the frequency of replacing the roll will increase proportionately, and what is even more important is that The problem is that the capacity of the packaging machine is reduced due to the fact that the packaging machine remains idle.

As one countermeasure for this, when the strip film of one rolled layer body is exhausted, the starting portion of the next strip film layer body is automatically added to the end portion of the exhausted strip film, and the rolled layer body is It is everyone's desire to be in a state where they are continuously supplied one after another.

[Problem that the invention seeks to solve]

However, achieving this desire is extremely difficult. This is because it is not easy to find a way to join the films together that is suitable for the above-mentioned joining. In other words, the joint method is as follows: ■ The joint must have a bonding force that will not break or peel off during the run, and ■ The joint must have a bonding force that will not break or peel off during the run. The film may become clogged at welded parts, etc., or the film may deviate from the system due to the running resistance.
Or, the joint must not allow the contents to leak from the defective back welding part. ■To compensate for the defects in ■ and ■ above, the operation of the machine must be temporarily stopped, or the running speed must be significantly reduced, etc. It is required that all of the above conditions ①, ②, and ② be satisfied, that is, the seam does not require any operation such as transferring it from the inside of the packaging system to the outside of the packaging system with artificial assistance, and that the so-called packaging capacity is not reduced. However, for example, those bonded with double-sided or single-sided adhesive tape do not satisfy the above condition (2), and those that are strongly reinforced cannot satisfy the condition (2) that the film does not clog, and also cannot be heated by normal heating. Even the one that was fused and sealed could not satisfy the condition (■), so in the end, we gave up on satisfying the condition (■) and decided that it would be sufficient if the rolled film could be transferred while the film was connected to the running system. This is the current level.

Thus, an object of the present invention is to provide a replenishment method that combines the above-mentioned (1), (2), and (2).

[Means for solving problems]

The present invention involves overlapping strip-shaped films with high permeability to high-frequency heating, sandwiching the overlapping portions between a pair of electrodes to which high-frequency waves are applied, and applying linear heat-sealing to the pinched portions. In the method for joining the strip-shaped film in which the films are joined by forming a part, the pinching pressure applied to the strip-shaped film between a pair of electrodes is such that the thickness of the strip is 0.2 to 1.
．． The overlapped film strips placed on a 0 mm synthetic rubber plate are pressed by a flat electrode from the back side of the rubber plate and an electrode with a linear tip from the film strip side. The present invention relates to a method for replenishing a strip-shaped film characterized by applying pressure.

Hereinafter, the present invention will be described in detail using embodiments of the drawings.

FIG. 3 is a conceptual diagram of the process when the replenishment method of the present invention is applied to an automatic filling and packaging machine, and is shown to help understand the role of each process device and the required functions arising therefrom.

First, the right half of FIG. 3 is a part illustrating the role and function of a conventionally known automatic filling and packaging machine. It will be destroyed. In this folder 14, the strip-shaped film F,'' is folded from approximately the center of the width of the strip, and further inside the fall goo so that the outside of the feeder vibe 15 for supplying the contents in the fall goo is covered with the film strip. The film is bent into a cylindrical shape with both side edges overlapped.Then, the next fusion sealing device 16.1
When the film passes through the 6° space, the overlapped film portions are fused and sealed to form cylindrical films. Then, feeder vibe 1 is placed inside the cylindrical film F.
The content 17 guided from the upper part by the 5 is supplied, and wire ligatures 19.19'' are applied to the portions to be ligated which are squeezed at predetermined distances by the squeezing rolls 18.18'' to form the package. It is completed automatically and continuously.

Moving to the left half of FIG. 3, generally, a wound layer F1, F8, which is a long strip-shaped film wound, is used as a film source for the above-mentioned continuous automatic packaging. In the case of Fig. 3, the film of the roll F, is already about to reach the terminal part F, ゛, and the roll F2 is in preparation for the next strip of film to be unwound, and the film of the roll F2 is in preparation for the next film strip to be unwound. The front end portion of the horse has been pulled out in advance to the joining device 1.2, and its front end portion Ft° is locked to the fixing plate 6.6". This state is shown on the left side of FIG. At the next moment, the final part F4' of the film of the winding body F is shown.
is in a free state, the sensing roll 7 is activated, and the two sets of upper and lower pinch rolls 8.8° and 9.9'' are pinched to fix the running film. The end of part F, ゛ is the lower pinch roll8.
This is the stage where the terminal portion before passing through 8° becomes shorter.

And the film F, which overlaps by being fixed,
The overlapping part of ``, F2'' is spliced by operating the splicing device 1.2, thereby allowing the next use of the strip film to be used.The rolls arranged in two rows above and below are Group 10.10', 10" and 11
``, li'' indicate the dancer roll device 11, which normally increases or decreases the film running speed in accordance with the elevation of the o-le 11'' side, and serves to keep the tension applied to the film constant. However, in this case, S has the function of supplying the film length during the time period when the traveling film is pinched and fixed by shortening the distance between the roll groups. Therefore, welding of the band-shaped films to each other is completed within that time period.

When the welding is completed, a strip film is supplied from the next wound layer F2 side, and the wound layer F2 is turned over and fixed in the position where the original wound layer F was by the terresor I-device 12.

Further, the dancer roll device 11 also returns to its original long roll spacing.

If the film strips are spliced together and the rolled layers are replaced quickly and reliably as described above, the packaging machine can continue to operate automatically without reducing its capacity. It should be possible.

However, with the conventional joining method, the seam may tear, the seam may get caught, the seam may need to be supported somewhere, or
The back welded part may break and the contents may come out, making it necessary to stop the packaging machine. This would be a problem, so in order to keep the film connected along the film travel path at least, and to ensure a smooth start-up of the next operation, the film joints should be checked while the packaging machine is stopped. It is necessary and has been necessary to take measures such as manually pulling up the parts and transporting them out of the system.

According to the investigation by the present inventors, the biggest cause of defects in conventional seams is the leading edge in the running direction of the film (i.e., corresponding to the leading edge of the newly supplied next strip of film). ) is not completely immobilized, this part supports the running process, especially inside the fall goo, the tip of the welded part, etc., creating abnormal running resistance, and this resistance can cause various phenomena. I've come to realize that it's going to happen.

The present invention is a replenishment method that can eliminate the tip, which is the biggest cause of the defect.

FIG. 1 is a perspective cross-sectional view showing a replenishment method that is characteristic of the present invention.

Further, this FIG. 1 corresponds to the fusion/splicing means utilized in the fusion device shown in FIG. 3 mentioned above.

In FIG. 1, the pinching of the stacked strip films F1 and F2 between the pair of electrodes 1 and 2 is similar to that of the pair of electrodes 1 and 2 for high-frequency heating welding, which is performed by applying high-frequency waves. The clamping pressure is performed between the electrodes, that is, the flat electrode 1 and the electrode 2 whose tip is linear, and a synthetic rubber plate 3 is placed on the flat electrode 1 side. The rubber plate 3 is used to apply pressure (pinching pressure). 4.5 is a Teflon film that protects the surface of each electrode, and will be placed as necessary.

[Effect]

Figure 2 clearly shows one of the effects of the present invention. This is an enlarged view of the welded parts of each film obtained when the plates are removed. This figure is also a sketch with diagonal lines added to one of the films so that the boundary between the two overlapping films can be clearly seen. .

The difference shown in Figure 2 A) and Figure 2 above is that the boundary 20 between the films, which is observed at the welded edge of the film, is
It is recognized as a difference (effect) in that it is formed in a sharper and more slanted shape than the figure (figure opening).

The difference is that the welded part of the present invention allows the film edge to be easily peeled off from the border 20 (Fig. 2A).
] and the welded part for comparison where the film edge cannot be peeled off [second
It can also be said that

Therefore, for example, the line shape of the tip on the electrode 2 side can be changed to a diagonal line shape in a direction diagonally cutting the film width as shown in FIG.
If you use an electrode shaped like a chevron with a pointed top and a widened hem as shown in the figure,
c) and Figure 5 a), c), and c), the leading edge of the film begins to fall off and bends due to the locking of the fixing plate 6.6゛ as the film progresses. It runs along the welding edge 21 in a drawn manner and automatically forms a seam having virtually no edges.

As a result, this seam does not clog inside the fall goo or the welded part and does not create abnormal running resistance, so the packaging machine must be stopped or slowed down, or the film seam can be manually removed. It can be taken out of the system without having to manually handle it, and continuous switching becomes possible.

The role of the synthetic rubber plate 3 used in the method of the present invention is to form the boundary of the above-mentioned special shape, and to provide the welded portion with unevenness in the way the pressure is applied during clamping and differences in the cooling rate. It is thought that this will fulfill the following requirements. This synthetic rubber plate was carefully selected from among many materials to be a material that does not interfere with high-frequency welding, does not melt at the applied high-frequency level, and has elastic cushioning properties, and has a specific gravity of 0. .75～
1.9 is a commercially available synthetic rubber. However, the wall thickness is 0.2
If the thickness is less than 1.0 mm, the elastic cushioning properties will be insufficient and it will be difficult to obtain the effect of the rubber layer.On the other hand, if it is thicker than 1.0 mm,
The welded part of the film will be damaged. Therefore, the practical thickness of the rubber plate is selected from the range of 0.2 to 1.0+ nm,
The rubber plate itself is preferably made of chloroprene rubber (trade name: Neoprene).

In the present invention, since the welding method is high frequency heating, the target film needs to be a synthetic resin film that is highly permeable to high frequency heating. As this type of synthetic resin, vinylidene chloride resin has good permeability to high frequency heating and has been put to practical use in many cases.

〔Effect of the invention〕

With the above-described configuration, the present invention can automatically create a seam with low running resistance. This addition is
It is possible to change the wrapping layer of the strip film of an automatic filling packaging machine without substantially reducing the capacity of the packaging machine and without requiring any human assistance. This is an excellent invention that will play a major role in the industry.

[Brief explanation of drawings]

FIG. 1 is a perspective sectional view of means used in the replenishment method that is characteristic of the present invention. Figure 2 clearly shows one of the effects of the present invention. FIG. 6 is an enlarged view of the resulting film welded portions when the plates are removed. FIG. 3 is a conceptual diagram of the process when the replenishment method of the present invention is applied to an automatic packaging machine. FIGS. 4 and 5 are schematic diagrams showing an example of the process in which unnecessary portions of the linear electrode and the tip of the replenishment film are removed and replenishment is performed. 1... Flat electrode 2... Linear electrode 3... Synthetic rubber plate 4... Teflon film 5... Teflon film

Claims (1)

[Claims] (1) Layer the strip-shaped films that are highly permeable to high-frequency heating, and press the overlapping part between a pair of electrodes to which high-frequency waves are applied, and form a linear heat-sealed part in the pressed part. In the band-shaped film splicing method in which the films are joined by forming a film, the pinching pressure applied to the band-shaped film between a pair of electrodes is such that the thickness is 0.2 to 1.0.
The sandwiching pressure is applied when a flat electrode is pressed from the back side of the rubber plate and an electrode with a linear tip is pressed from the side of the strip film, which presses the stacked film strips on a synthetic rubber plate of 1.5 mm in diameter. A method for splicing a strip-shaped film, characterized by: