JPS6258904B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for producing a continuous film for packaging, which is used in an automatic filling and packaging machine for, for example, ham, sausage, etc.

(Prior Art) Generally, this type of continuous film for packaging is manufactured as follows.

Printing is performed on a roll of material film.

Inspection is performed while winding up the printed film or while running the printed film to check for defective areas such as poor printing, scratches, adhesion of dust, etc., and mark the relevant areas.

While running the inspected film, the marked defective areas are cut out, and the non-defective parts are spliced together and slitted.

Note that, from the point of view of production efficiency of the packaging material, the same printing is usually performed on multiple strips of wide-width film. The slitting process is performed to separate the film into individual strips and to apply them to an automatic filling and packaging machine.

(Problems to be Solved by the Invention) Conventionally, adhesive tape has been used when joining good products together in the above process. In other words, the cut films are partially overlapped and adhesive tape is applied thereto to form a continuous body again, but the continuous film thus obtained has a step at the position where the adhesive tape is applied. Become.

The film is then loaded into an automatic filling and packaging machine as a roll, and as it is unwound, it is wound into a tube, and the overlapping portion along the axial direction of the tube is high-frequency sealed. However, since the area where the adhesive tape is located is not well sealed, when filling the container with ham, etc., there is a risk that the contents may spill out from the area where the adhesive tape is located. Therefore, conventionally, the supply of contents is temporarily stopped when the adhesive tape attachment point reaches the filling section, and the supply is restarted after the adhesive tape has passed the attachment point.

This causes a problem in that packaging efficiency is reduced and good films pasted before and after the pasting point are wasted.

The present invention has been made in view of the above-mentioned problems, and when used in an automatic filling and packaging machine, there is no need to stop filling every time a joint is reached, and it is possible to always perform continuous filling and packaging. Provided is a method for manufacturing a continuous film for packaging used in automatic filling and packaging machines for ham, sausage, etc.

(Means for Solving the Problem) To achieve this object, the present invention provides a method for manufacturing a continuous film for packaging used in an automatic filling and packaging machine for ham, sausage, etc. Remove the defective parts from the printed film by cutting the film in the width direction on both sides of the printed film, and overlap the cut ends of both films after the cutting in the shape of palms together. , using an ultrasonic sealer to linearly weld the films in the width direction and remove the excess cut end regions of both films outside the linearly welded areas;
Next, a method for manufacturing a continuous film for packaging is provided, in which a portion of the linearly welded portion within the region of the film to be high-frequency sealed is melted and flattened using an ultrasonic sealer.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows that when carrying out the method according to the present invention,
FIG. 2 is a perspective view of an apparatus for performing slitting.
In the figure, 10 is a roll of a continuous film such as polyvinylidene chloride film that has been printed and has two stripes 12 formed thereon, 14 is a slitter blade, and 16 is a roll of continuous film that has been cut into strips.

The roll 10 is rotated at a low speed, and the continuous film unwound therefrom is watched by an operator while it reaches the slitter blade 14. The roll 10 has already been inspected after the printing process, and markings (for example, by pasting tape 18) are placed on defective areas such as printing defects, scratches, and dust adhesion that are discovered during the inspection process.

When the operator discovers this marked portion, he stops feeding the film, and as shown in the second figure, cuts 20 the defective portion and removes it. This cutting 20 is performed over the entire length of the film in the width direction.

Next, as shown in the third figure, the two cut films are stacked one on top of the other in the shape of palms joining together, and linear welding is performed on the portion 22. The welding is performed using an ultrasonic sealer, for example, by scanning a sealer section constituted by a pointed member 24 along the film overlapping section 22. As a result, an excess piece is formed on the outside of the seal line, but it is torn off along the seal line and removed at the same time as sealing is completed.

Further, a convex portion 26 is formed in the remaining non-defective portion by a seal, as shown in FIGS. 4 and 5. The convex portions 26 cause sealing failures during high frequency sealing, similar to conventionally used tapes.

Therefore, in the next step, ultrasonic sealing is performed again on the linear welding location 26 shown in FIG. 5, and flattening processing is performed to the same extent as the film surface. In this case, the sealer part has a truncated pyramid shape,
By pressing the truncated portion 28 along the seal line, the convex portion 26 is flattened.
The portion flattened by the truncated head 28 is
As shown in Fig. 6, the part 30 where the film should be wrapped and high-frequency sealed so that it can be wrapped - both sides of each strip -
This is done only for

The film that has undergone the flattening process is then cut into strips by a slitter blade 14, and the edges 32 are cut into strips.
is removed and wound up as each roll 16.
The thus obtained roll 16 is mounted on an automatic filling and packaging machine, wound in the width direction, and the polymerized both sides are sealed by high frequency, and then filled with contents such as ham, sausage, etc. , the welded parts of the film are firmly connected, and both sides 3
0 is flattened, so it is possible to perform good high-frequency sealing over the entire length of the film, and the strength of the film joints is sufficiently guaranteed, so there is no possibility that the film will be cut at the joints during filling and packaging operations. Therefore, a continuous filling operation can be performed.

Here, there are cases where a continuous pattern is displayed on the film, and cases where a pattern is displayed at a fixed pitch. If it is continuous, cutting and welding of the defective area can be done at any point. Therefore, even in an automatic filling machine, if the feed rate of the film is constant, packaged products with a constant display can be obtained. Can be done. Then, it is only necessary to remove the length of the packaged product in which the welded part appears in the center part, and there is no need to stop the flow in the filling machine.

On the other hand, when displaying at a fixed pitch, as shown in FIG. 7, a register mark 34 for detecting the position of each pitch is usually provided adjacent to each pattern 36, and the cutting and welding is performed at this adjacent position. It is desirable to do so.

In such a case, since the cut point by the automatic filling machine coincides with the welded part, there will be no occurrence of defective packages.

(Effects of the Invention) As described above, in the present invention, compared to the conventional adhesive tape bonding method, high frequency sealing is performed better over the entire length of the film, so when the film is used in an automatic filling and packaging machine, the bonded area is There is no need to stop filling each time, and since the flattening process described above is performed only on the area to be high-frequency sealed, the flattening process with the ultrasonic sealer will prevent the strength of the joined parts from decreasing. In other words, the bonding strength of the film joints is sufficiently guaranteed by the part of the film welded by the ultrasonic sealer that is not melted and flattened, so that cutting from the film joints occurs during filling and packaging operations. It is now possible to provide a continuous film for packaging ham, sausage, etc., which can be filled and packaged continuously at all times, and as a result, the efficiency of the packaging process can be improved and the packaging film can be saved. play.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an apparatus used for a slitting process to which the present invention can be applied. 2 is a schematic side view of the apparatus of FIG. 1 showing the cutting process, FIG. 3 is a similar side view showing the welding process, and FIG. 4 is a similar side view showing the completion of welding. FIG. 5 is a perspective view of the film corresponding to FIG. 4. FIG. 6 is a perspective view of the film after the flattening process is completed. FIG. 7 is a perspective view of a film according to another embodiment. DESCRIPTION OF SYMBOLS 10... Continuous film roll, 12... Design, 20... Cutting portion, 22... Overlapping portion, 26
...Protrusion.

Claims (1)

[Claims] 1. In a method for manufacturing continuous film for packaging used in automatic filling and packaging machines for ham, sausage, etc., printing is applied to a roll of material film, and the defective areas are identified from the printed film. The film is removed by cutting it in the width direction on both the front and back sides, and the cut ends of both films after the cutting are overlapped in the shape of palms together, and are welded in a line in the width direction using an ultrasonic sealer. Remove the excess cut edge regions of both films outside of the welded portions, and then melt and flatten the portions of the linearly welded portions that are within the region of the film to be high-frequency sealed using an ultrasonic sealer. A method for producing a continuous film for packaging, characterized by: