JPH0343122B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic bag making and filling machine for manufacturing sealed subdivided bags made of plastic film or a laminate film of plastic and other materials.
By providing a large number of scars along the edge line of the fused part, the bag can be torn from any part of the edge line of the fused part when opening the bag, and it can be prevented from being torn during distribution or storage. This invention relates to an automatic bag-forming-filling machine for manufacturing sealed subdivided bags.

[Prior art]

Recently, plastic films and laminate films made of plastic and other materials such as metals such as aluminum foil and paper have become lightweight, have excellent airtightness, high strength, and are convenient to handle. Because it does not require any heat-sealing and can be simply heat-sealed, it is used in subdividing bags for a wide variety of products such as liquid, powder, paste, and solid products, such as food, medicine, and small items.

In the case of these airtight subdivided bags, the advantages of the materials used conversely result in resistance to tearing when the bag is opened, posing the problem that they are difficult to tear. Although the film material for sealed subdivided bags is strong, once a scratch occurs, it tends to propagate easily.
If you pull this as a tear opening, you can open it with just the strength of your fingers.

For this reason, a method is used in which a vertical cut is made in front of the edge of the film at the fused area, but in this case, it is difficult to find where on the edge of the bag the tear opening is made. There is. In addition, a V-shaped cut is also made on the edge, and this method makes it easy to find the tear, but when making and filling bags in large quantities, the V-shaped cut pieces are scattered. They tended to adhere to packaged products and worsen the working environment.

In any case, these methods limit the tear to one location, which may not always be the desired location and may cause the tear to propagate in an undesired direction and the contents to be scattered around. This caused some inconvenience. In addition, the depth of these cuts is about 2 mm, so it is vulnerable to external forces, and having many such holes may reduce the strength for distribution and storage, complicating the manufacturing process, It is difficult to adopt.

Also, there are some with the entire edge section serrated,
This is because the corners of the recesses of the sawtooth are relatively obtuse and rounded, and the cutting initiation effect is small.
It is not suitable for use in subdivided bags made of thick film sealed with paste or hygroscopic substances.

[Means of problem solving]

Unlike the obvious cuts caused by such blades in the prior art, the present invention creates a group of fine scars made of a hard material having a group of minute protrusions such as an abrasive material along the edge line of the fused part of the bag. shall be established;
Furthermore, a device for this processing is incorporated into an automatic bag-forming-filling machine. To create a group of scars, abrasion is performed using a rotating grindstone, a rotating body with an abrasive grain surface, a wire brush, or the like.

The film for bag making according to the present invention is a plastic film or a combination of plastic and metal such as aluminum foil.
A rolled film is used, which is a laminate with other materials such as paper.

The automatic bag-filling machine includes at least a film unwinding device, a longitudinal welding device, a transverse welding device, a transverse cutting device, a content filling tube, and optionally a longitudinal cutting device. In addition to this, the present invention is characterized in that it is equipped with a processing device for forming a group of scars along the edge line of the fused portion of the bag, that is, a rubbing device using an abrasive material.

In the case of one row of vertical welding, a three-sided sealed bag is manufactured by combining the top and bottom ends, and when this vertical welding area is placed in the center of one side of the product bag, the so-called Two pillow-shaped bags are placed vertically.
In the case of fusion bonding at certain locations, a four-sided sealed bag is manufactured.

Scars are a large number of small scratches that cannot be easily identified with the naked eye, and are densely arranged in a band shape from the surface of the edge of the film toward the thickness of the film.

The size and density of the individual scars, which are densely packed in a band, vary depending on the type and thickness of the film; some penetrate through the film, some have only shallow gaps, and some are locally elongated. etc. If the film is thick and difficult to break, use a coarse abrasive and apply some pressure to create many thick, sharp scars.

To create such scars, use a group of minute protrusions made of a hard material such as a metal disc grindstone, a disc-shaped or cylindrical rotating grindstone, a wire brush, an abrasive-containing sheet material, an abrasive-adhesive sheet material, etc. Scrub using an abrasive material. In this case, the depth of the scar varies depending on the degree of unevenness, and a depth suitable for the film to be processed is used. In any case, the scars are small due to abrasive grains, and are essentially different from cuts made by conventional knives in that they are minute, and are also different from traditional cuts in that there are countless bands of such scars. is fundamentally different.

The processing device for creating the scars uses an abrasive material that uses known abrasive grains such as alundum or silicon carbide, or a hard material having a rough uneven surface. The processing device is provided with a pair of rolls, at least one of which has a group of minute protrusions, that rotate in opposite directions after unwinding and before vertical welding. A portion of the film that will become an edge line when the film is made into a bag is passed between the pair of rolls.

When creating scars on the transversely fused portion, a pair of rolls having a group of minute protrusions on at least one side and rotating in opposite directions and arranged in a direction perpendicular to the running direction of the film are brought into contact intermittently. By arranging them in this manner, a sealed bag having a group of scars in the lateral welded portion can be obtained.

〔effect〕

According to the present invention, a group of minute scars that cannot be discerned with the naked eye are created on the edge of the fused portion of the bag at the same time as the bag is made and filled. It is possible to manufacture a sealed bag that does not reduce the water resistance and can be torn from any part with the force of fingers.

〔Example〕

FIG. 1 is a schematic diagram of an automatic bag-forming-filling machine. 1 is a polypropylene film which is wound and is unwound and fed in the direction of the arrow. 2
is a processing apparatus according to the present invention, in which a pair of thin rolls are provided so as to be in contact with both ends of the unwound film. As shown in FIG. 2, it consists of a pair of rolls 3 and 4 that rotate in opposite directions, and roll 3 is made of hardened abrasive grains. Roll 4 has a smooth surface. A large number of scars were formed on the surface of the film 1 along the edge line.

When the film passes through the film homer 5, it is folded twice. 6 is a longitudinal welding device which welds the film into a cylindrical shape. Reference numeral 7 denotes a cutter, which places a Teflon plate or the like at the center of the cylindrical film and cuts only half the circumference of the cylindrical film horizontally at constant intervals to form openings 8. Reference numeral 9 denotes a pair of feed rolls, and the rotational speed of the feed rolls 9 adjusts the film feeding speed. 10 is a tube filled with contents, and purified common salt was used as the contents in this example. The cylindrical film filled with contents sags under its own weight. 11 is a lateral welding and cutting device that makes horizontal reciprocating motion and is equipped with a high frequency welding mechanism and a cutting mechanism, and is capable of welding to close the top end of a bag and to close the bottom of the next bag. At the same time, cut the center of the fused part. 12 is a completed sealed subdivided bag, and 13 is its contents.

FIGS. 3 and 4 show an example in which a four-sided sealed subdivided bag filled with dough is made. 1 is a film which, after being unwound, passes through a processing device in which six rows of narrow rotary grindstones are arranged at equal intervals. Therefore, six rows of scar groups 19 were obtained in the film running direction. Reference numeral 20 indicates a portion that should become a lateral welding portion when a four-sided seal type bag is made as shown in FIG. Reference numeral 21 indicates a portion that should become a vertical welding portion when a four-side seal type bag is made. In this example, we used an automatic bag making and filling machine that fuses several rows in the vertical direction and fills each row with the contents from an independent nozzle. was manufactured. Therefore,
In this case, the scars 19 are densely provided at the edge of the longitudinally fused portion. 22 is the horizontal cutting line, 23
is the longitudinal cutting line.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a schematic diagram of the present invention, FIG. 2 is an enlarged view of the processing apparatus according to the present invention, FIG. 3 is a plan view of the film immediately after processing, and FIG.
The figure is a perspective view of a sealed subdivided bag. In the drawings, 1 is a film, 2 is a processing device,
3 and 4 are rolls, 6 is a vertical welding device, 10 is a filling tube, 11 is a lateral welding and cutting device, 1
2 is a sealed subdivided bag, 14 is a fused portion, 18 is an abrasive layer, 19 is a scar group, 20, 21 is a fused portion, 22,
23 is a cutting line.

Claims (1)

[Scope of Claims] 1. A film unwinding device, a vertical welding device for vertically welding the film unwound from the unwinding device into a predetermined bag width, and a film that is vertically fused and filled with contents. A lateral welding device and a lateral cutting device that cut the fused portion in the center immediately after or at the same time after transversely welding the upper part of the film, and only the upper end that was laterally fused is open. In an automatic bag making and filling machine equipped with a content filling tube for filling the film with contents, after the film is unwound and before it is vertically fused, a group of minute protrusions, at least one of which is made of a hard material, is formed. A scratching device, which is a pair of rolls that rotate in opposite directions, is installed, making it possible to create dense scars along the edge line of the film that will become the fused area when a bag is formed. Automatic bag making and filling machine.