JPH0364363B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses an automatic filling and packaging machine to form a tube by continuously passing a thermoplastic strip film through a forming device, and welding both ends of the stacked films with electrodes from both sides to form a tube. The present invention relates to a bag making device for an automatic filling machine that forms a casing and fills the cylindrical casing with a material to be filled.

It is well known that vinylidene chloride-based strip films, which tend to generate heat when high frequency is applied, are overlapped on both sides in the longitudinal direction and run between high frequency application electrodes, and the overlapping films are welded to form a cylindrical casing film. It is about.

For example, a long strip-shaped film is formed into a cylindrical body surrounding a fixed electrode, which is a negative electrode, and is run, and a pressure electrode (a positive electrode ) and a fixed electrode (negative electrode), and applies a high frequency voltage to the film at the overlapping portions of both ends to form a cylindrical casing film by intermittent or continuous welding, or an automatic filling machine, etc. In this process, a long strip-shaped film is continuously fed while forming a cylindrical body surrounding a stuffer nozzle that also has a fixed electrode (negative electrode), while overlapping both ends of the cylindrical film. While pinching or pressing the mating part with a pressure electrode (positive electrode), a high frequency current is applied between the fixed electrode and the pressure electrode to continuously weld the overlapped parts on both sides of the film running between the electrodes. An apparatus is known that forms a cylindrical casing film and then supplies and fills the contents from the tip of a stuffer nozzle to produce a package.

Conventionally, a cylindrical casing film is made using an automatic filling and packaging machine that uses a high-frequency thermal welding device that has a fixed electrode integrated with a staff nozzle as described above.
When filling dough products such as cheese, flower paste, bean paste, curry, and meat sauce, these are all highly viscous and need to be given easy-flowing properties to improve filling properties. It is pressurized and put into a hopper provided in a filling machine, and then passed through a nozzle and filled into the above-mentioned cylindrical casing film.

In this case, the temperature of the filled articles differs significantly between immediately after being loaded into the hopper and after the passage of time, or depending on the lot loaded into the hopper, resulting in the following problems.

Once the high-frequency sealing conditions have been determined and the bag making and filling operations have started, if the temperature of the filled article passing through the staff nozzle changes moment by moment, this change in temperature of the article will affect the fixed electrode integrated with the staff nozzle and the stationary electrode. This causes a temperature change in the film to be welded as it passes through, resulting in a change in sealing conditions, leading to seal failure (melting due to insufficient or excessive melting, and even bag breakage), loss of filling due to bag breakage, and operation stoppage. This causes problems such as

A similar problem occurs when the temperature of the filled articles introduced into the hopper varies depending on the input lot.

Similarly, even when filling at a temperature lower than room temperature (e.g. sausages, surimi, etc.), the product temperature varies depending on the hopper input lot and the sealing conditions change, often causing problems such as bag breakage. There are problems such as the need for continuous monitoring.

The atmosphere at a filling factory for food and other water-containing products is generally a high-humidity atmosphere, and when something colder than room temperature passes through a nozzle with a fixed electrode,
If water droplets are generated on the surface of the fixed electrode or dropped from the surroundings onto the surface of the fixed electrode, sparks will be generated during high frequency sealing.

Furthermore, the generation of water droplets on the nozzle makes it difficult for the film to pass over the nozzle. This impedes the smooth flow of the film, making normal sealing impossible, and also causes dimensional variations in the package.

Furthermore, when using a heat-shrinkable film, if a high-temperature object is passed through a conventional filling nozzle (which also serves as a fixed electrode), the nozzle and electrode will be heated by the contents, and as a result, the film surrounding the nozzle will shrink and become a contact with the electrode. This causes problems such as the folding width not meeting the specifications or the film becoming unable to slide and eventually being cut.

As a countermeasure against this problem, the film is heat-treated in advance to remove the shrinkage property, but in this case, the heat treatment must be performed to match the temperature of the filler, making the production and management of the film extremely complicated.

Even if the degree of winding is weak and the film passes through, the film will not slide smoothly on the nozzle and as a result, the sealing performance will be unstable, causing problems in the production of packages.

As described above, the conventional electrode consisting of a nozzle and a fixed electrode has been a major obstacle to the purpose of easily and efficiently manufacturing packaging of good quality by anyone.

The present invention solves the above-mentioned conventional problems and makes it possible to stabilize a high-frequency sealable thermoplastic film continuously running between two electrodes without being affected by the article temperature of the filling material passing through a static nozzle. The object of the present invention is to provide a bag making device for an automatic filling machine that has a sealing function.

The present invention involves guiding a thermoplastic band-shaped film such as vinylidene chloride-based synthetic resin to a wound forming plate and overlapping it on both sides in the longitudinal direction to form a cylindrical shape. The overlapped portion is sandwiched between a pressure electrode and a fixed electrode located below the forming plate, and welded using high frequency, ultrasonic waves, heat, etc. to form a bag into a cylindrical casing. After filling the material to be filled into the shaped casing from a stud nozzle that penetrates through the forming plate and has a discharge port slightly below the forming plate, the material is ligated to obtain a product, The overlapping part of the film is connected to a fixed electrode which is integrally attached to the stuffer nozzle at a part of the lower outer periphery of the forming plate at a distance from the stuffer nozzle, and to the fixed electrode through the overlapping part of the film. By sandwiching it between the pressure electrodes facing each other, a gap is created between the staff nozzle and the fixed (negative) electrode surrounding it, so that the temperature of the filling material does not affect the fixed electrode or film. This is what I did.

Hereinafter, embodiments of the present invention will be described in comparison with a conventional case based on the accompanying drawings.

FIG. 1 shows a schematic perspective view of an automatic filling machine equipped with a conventional bag-making device, and FIG. 2 shows only the bag-making device portion in the same figure in an enlarged perspective view.

In FIG. 1, reference numeral 1 denotes a thermoplastic strip-shaped film that is wound into a roll on a raw fabric shaft, which passes through a plurality of tension idle rollers 21, 22, 23, and is then passed through a forming plate 3 in the form of a roll with an inclined upper end. A fixed electrode (negative electrode) 61 and a fixed electrode (negative electrode) 61 are attached to the lower end of the staff nozzle 5 which passes through the forming plate 3 and has an outlet facing directly below the forming plate 3. While the size (diameter) is regulated by the size ring 31, the overlapping portion is continuously welded between the fixed electrode 61 and the pressing electrode 62 facing thereto, and is attached to the cylindrical casing 11. While the cylindrical casing 11 is being conveyed downward while being held between a pair of take-up rollers 41 disposed below the outlet of the stuffer nozzle 5, the cylindrical casing 11 is filled with the stuffing material. The material to be filled is filled from the nozzle 5. Thereafter, the ligating section 7 located below the take-up roller 41 clips the ligature at set intervals to complete the product.

According to the present invention, a cylindrical casing is formed using the apparatus described above using an apparatus as shown in FIG. 2.

That is, the annular fixed electrode 61', which is spaced from the staff nozzle 5 in the radial direction and is formed to have approximately the same diameter as the coiled forming plate 3, has a continuous portion 61'A provided in a part of its circumferential direction. It is constructed integrally with the forming plate 3. Such forming plate 3 and fixed electrode 6
1', in the case of the illustrated example, first, a fixed electrode expansion plate part is provided below the connecting part 61'A and extends on both sides in the lateral direction with the connecting part 61'A in the center;
The upper part of the connecting part 61'A is integrally stamped with a forming plate expanding plate part extending to the right of the connecting part 61'A from a plate material using a press.
The two expansion plate parts are formed into an annular shape and a coiled shape as shown in the figure, and then a holding plate 31 is attached to the lower part of the forming plate 3. Therefore, a sufficient gap is ensured over the entire circumference between the fixed electrode 61' and the staff nozzle 5 penetrating the forming plate 3.

Further, the fixed electrode 61' has an annular shape,
It also serves as a sizing ring. Here, the fixed electrode 61' is not limited to an annular shape, but it is sufficient to have at least half a circumference, and if there is another member that functions as a size ring, it is sufficient that it exists in a part of the circumference.

Note that the pressurizing electrode that acts in pair with the fixed electrode 61' may be of the conventional type shown in FIG. According to the present invention, the cylindrical film serves as the fixed electrode 6 which also serves as a size ring.
The diameter is regulated at 1', and the overlapping part is the fixed electrode 61' and the pressurizing electrode 62.
Since the cylindrical casing 11 is formed by being welded by It is not affected by the above temperature. Therefore, the present invention has the following effects.

When sealing a traveling film into a cylindrical casing, the negative electrode (fixed electrode) and the film pass through the staff nozzle. Stable bag sealing and filling are possible without being affected by the temperature of the filling material or temperature changes. This will help improve product quality.

The wrapping of the film around the staff nozzle is eliminated, allowing stable film running and eliminating equipment troubles.

There is little loss in applied current, and electricity can be saved.

Since the staff nozzle of the conventional device also served as a fixed electrode and determined the bag-making standard (the size of the cylindrical casing), it was difficult to set the diameter of the staff nozzle arbitrarily, but with the device of the present invention, By separating the fixed electrode and sizing ring from the staff nozzle and moving them to a part of the forming plate, it is possible to increase the nozzle diameter in combination with the forming plate compared to conventional methods, which is not possible with conventional staff nozzles. It also becomes possible to fill solid materials, which was previously possible.

When using conventional equipment, it is necessary to adjust the position of the guide rollers and forming plate in order to meet the bag-making specifications.
However, by using the bag-making device of the present invention, anyone can easily make bags according to the bag-making specifications without having to adjust the position of the forming plate or the position of the guide roller. can be produced.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of an automatic filling machine equipped with a conventional bag-making device, and Fig. 2 is a bag-making device used in the automatic filling machine of Fig. 1. It is a perspective view of an example. DESCRIPTION OF SYMBOLS 1... Strip film, 11... Cylindrical casing, 3... Forming plate, 5... Stuff nozzle, 61'... Fixed electrode, 62... Pressure electrode.

Claims (1)

[Scope of Claims] 1. A winding forming plate formed into a cylindrical shape by overlapping strip-shaped films at both end portions in the longitudinal direction; A pressurized electrode and a fixed electrode that are welded to form a bag into a cylindrical casing while being compressed, and a statue nozzle that penetrates the forming plate and faces into the cylindrical casing, the fixed electrode is attached to the lower outer periphery of the forming plate. A part of the automatic filling machine is integrally attached to the forming plate apart from the filling nozzle, and the pressurizing electrode is disposed facing the fixed electrode. Bag device.