KR100302544B1 - Handle for polyethylene film bag - Google Patents

Abstract

PURPOSE: Provided is a handle for polyethylene film bag which is recycled along with the polyethylene film bag and is not separated from the bag body, and whose print is free from damage. CONSTITUTION: The handle for polyethylene film bag is adhered at both sides of a polyethylene film bag by an adhesive. The handle(31) is made of a polyethylene film. In the surface of the handle(31), a print(37) is formed and an adhesion surface on the polyethylene film bag(11) are treated by the high voltage direct current discharge method so that they have a surface tension of 40 to 45 dyne/cm¬2. The polyethylene film bag(11) and the handle(31) are made of linear low-density polyethylene.

Description

Polyethylene film bag handle

(Technology field)

The present invention relates to a handle of a plastic film bag for packaging, and more particularly, to a handle for transporting a polyethylene film attached to the polyethylene film bag for wrapping and packaging a plurality of articles such as toilet paper and disposable diapers.

(Prior art)

When a scroll is shipped with a relatively light weight item having a certain size, such as toilet paper or a disposable diaper, it is common to pack a plurality of items in a bag-shaped bag, and polyethylene (PE) and poly Plastic films based on thermoplastic resins such as propylene (PP) and soft vinyl chloride resins are mainly used.

In packaging an article with a plastic film bag, an automatic packaging device that performs a series of processes from plastic film production to bag production to product packaging in one device is widely used in terms of labor saving and productivity improvement.

The plastic film encapsulation seals one end of a tubular film produced by an inflation film processing apparatus including an extruder, a cylindrical die, an air cooling ring, a die plate, and a take-up and winder. It is produced by cutting to a predetermined dimension or by folding, cutting and cutting on three sides a smooth thin film-like film produced by an extruder, a T die, a cooling roll, and a T die processing apparatus including a take-up and a winder.

As a method of sealing a film, a bonding method for welding a film by heat is widely used. The heat welding method includes a heat seal for pressing a heating element maintained at a constant temperature higher than the welding temperature of a raw material plastic to a plastic film; There is an impulse seal for heating welding and rapid cooling by allowing a large current to flow through the heating element.

BACKGROUND OF THE INVENTION As a thermoplastic resin film for wrapping articles such as toilet paper, a polyethylene film is widely used due to its opacity or translucency, excellent water resistance, chemical resistance, electrical insulation, and the like.

1 is a perspective view showing an example of a state in which a roll of toilet paper is wrapped by a conventional packaging bag made of polyethylene film, Figure 2 is a handle plan view of Figure 1, Figure 3 is a cross-sectional view taken along line aa of Figure 2 to be.

As shown in Fig. 1, the conventional packaging polyethylene film bag 11 is folded into a film 13 containing polyethylene resin as a main component in half, and the vertical surface is sealed by heat welding 15 to make a tube shape primarily. Next, one end of the tube is folded up and down and left and right, and then sealed by heat welding 17 to make a bag. Finally, a plurality of rolls of toilet paper 19 are put into the other end that is not threaded, and then not sealed. By folding the end portions up and down and left and right and sealing them by heat welding 21, a plurality of rolls are arranged to wrap the toilet paper 19. This series of rolls of toilet paper packaging operations are performed by an automated packaging device.

The conventional polyethylene film bag 11 in which the roll wraps the toilet paper 19 is generally attached with a handle 23 to facilitate its transportation. The configuration and attachment position of the handle 23 may vary greatly depending on the overall shape of the film bag 11 and the like depending on the wrapping method of the toilet paper 19. However, as shown in FIGS. The method of attaching the tape-shaped film handle 23 made with the adhesive 25 to the film bag 11 is partially used.

On the other hand, since the polyethylene resin is a chemically stable resin, it has a characteristic that the printing ink is difficult to bond to the polyethylene film surface. Therefore, when a handle is comprised from a polyethylene film, there exists a problem in printing. In other words, it is common to print a label, a manufacturer, or a propaganda message on a handle of a packaging film bag, and when the handle is made of polyethylene film, it is printed on the polyethylene film surface because polyethylene is a chemically stable resin. Ink is difficult to combine Therefore, when the printing ink applied to the polyethylene film is exposed to the outside, the printing ink is detached and easily damaged.

For this reason, in the conventional polyethylene film encapsulation 11, a polypropylene film having a somewhat better bonding force to a printing ink than polyethylene is used as the handle 23.

However, polypropylene film is also a chemically stable resin, and the binding force to the printing ink is not sufficient, so that like the polyethylene film, the printed ink is very likely to be damaged. Thus, the conventional handle 23, as shown in Fig. 3, forms the handle 23 into two layers of polypropylene film 27 and prints 29 between the two layers of polypropylene film 27. By doing this, the printing 29 is prevented from being damaged.

The conventional handle structure in which the print 29 is applied between the two-ply polypropylene film 21 as described above has the advantage that the print 29 is not damaged, while the handle 23 is produced and adhered to. There are the following problems in playback.

First, since the conventional handle 23 has to print 29 between two layers of polypropylene films 27, the manufacturing process of the handle 23 is complicated and costs a lot.

Next, in adhering the handle 23 made of polypropylene to the film bag 11 made of polyethylene, the surface properties of the chemically stable polyethylene film and the polypropylene film and the adhesion of the bag 11 and the handle 23 to be adhered. Due to heterogeneity, there is a problem in that the adhesion between the polyethylene film and the polypropylene film is weak. This often causes the handle to fall off the bag and fall during transportation.

Finally, unlike the bag 11 made of polyethylene film, since the material of the handle 23 is made of a polypropylene film that is not regenerated, there is a problem that it is not environmentally friendly. That is, the bag 11 made of polyethylene film is collected and recycled by recycling into sewage pipes, while the polypropylene film made of the handle 23 is not regenerated. The propylene film handle 23 has to be removed separately, and when the polypropylene film handle is introduced in the process of regenerating the polyethylene film bag, various problems are caused in regeneration.

Accordingly, an object of the present invention is to solve the problem of having a handle printed between two layers of polypropylene film used in a conventional packaging film bag based on polyethylene, the handle being the same as that of a polyethylene film bag. The present invention is to provide a handle for polyethylene film encapsulation, which is formed of a material so that the handle can be reproduced with the film bag, and at the same time, the printing on the handle is stably maintained and the adhesion of the handle to the film bag is excellent.

1 is a perspective view showing an example of a state in which a roll of toilet paper wrapped by a conventional packaging bag made of a polyethylene film.

Figure 2 is a plan view of the handle of Figure 1;

3 is a cross-sectional view taken along the line a-a of FIG.

Figure 4 is a cross-sectional view of the handle for polyethylene film encapsulation according to the present invention.

Explanation of symbols on the main parts of the drawings

11: polyethylene film bag 19: rolled toilet paper

31: handle 33: polyethylene film

35: adhesive 37: printing

The above object of the present invention is to treat the polyethylene film, which was excluded due to poor adhesion to printing ink and adhesive for use as a handle of the polyethylene film bag, by surface treatment with a high-pressure direct current discharge, and its surface tension is 40 dyne / cm 2 to 45 dyne / cm 2. It is achieved by a polyethylene film encapsulation handle which has a good binding property to printing inks and adhesives, and also makes it possible to reproduce the handle together when the polyethylene film encapsulation is reproduced.

Specifically, an object of the present invention is a handle for carrying a polyethylene film bag formed by bonding an adhesive to both sides of a polyethylene film bag, wherein the handle is made of a polyethylene film, and the printing of the handle and the polyethylene film bag The adhesive bonding surface of the handle is a high pressure direct current discharge treatment (corona discharge treatment), and the surface tension is achieved by a polyethylene film encapsulation handle, characterized in that 40dyne / ㎠ to 45dyne / ㎠.

Hereinafter, a handle for a polyethylene film encapsulation according to the present invention with reference to the accompanying drawings in detail. The following specific examples are merely illustrative of the polyethylene film encapsulation handle according to the present invention, but are not intended to limit the scope of the present invention.

Figure 4 is a cross-sectional view of the handle for polyethylene film encapsulation according to the present invention. The handle 31 for polyethylene film encapsulation according to the present invention is a handle for use in the film bag 11 made of polyethylene, which has been mentioned in the above description of the prior art.

As described above, the film made of polyethylene resin is very stable because of its non-polar surface, and has a very low surface tension. Therefore, when the printing ink or adhesive is applied to the polyethylene film as it is, the ink component is easily released due to the low bonding strength and the adhesion surface is easily dropped.

In order to enable the polyethylene film handle 31 to be used for the polyethylene film encapsulation 11, the polyethylene film having a surface tension of about 30 dyne / cm 2 is surface-treated by high-pressure direct current discharge, and the surface tension thereof is 40 dyne / cm 2. It is made to have a sufficient bonding force with respect to the ink 37 and the adhesive 35 by setting it to 45 dyne / cm <2>.

Corona discharge is a local discharge phenomenon that occurs only in a strong electric field when a strong unbalanced electric field is generated around a conductor. Corona discharge is generated from the needle electrode when a high voltage DC voltage is applied between the plate electrode and the needle electrode. do.

When the polyethylene film surface is subjected to corona discharge treatment, a polyethylene film having an initial surface tension of approximately 30 dyne / cm 2 can change its surface tension to 32 to 45 dyne / cm 2. The polyethylene film requires a surface tension of at least 38 dyne / cm 2 or more in order to exhibit sufficient adsorption to the ink component, and the polyethylene film surface has a variation of 40-50 dyne / It should exhibit a surface tension of cm 2. On the other hand, when the surface tension of a polyethylene film reaches 38 dyne / cm <2> or more, it is known that a crosslinking reaction arises on a film surface and sealing property falls.

According to the characteristics of the polyethylene film, in the present invention, in attaching the handle 31 made of polyethylene film to the packaging bag 11 made of polyethylene film, the print 37 and the adhesive 35 applied to the handle 31 Prior to performing, at least the surface of the handle 31 to which the printing ink and the adhesive are applied and the adhesive surface of the packaging bag 11 to which the handle is attached are subjected to corona discharge treatment.

The corona discharge treatment appropriately adjusts the throughput so that the surface tension of the printing surface of the handle 31 and the adhesive surface of the polyethylene film encapsulation 11 and the handle 31 is 40 dyne / cm 2 to 45 dyne / cm 2.

Accordingly, the handle 31 for polyethylene film encapsulation according to the present invention, as shown in Figure 4, the handle 31 of a single layer is coated with an adhesive 35 on one side of both ends of the polyethylene film 33. And the handle 31 to which the printing ink 37 is applied to the surface on which the adhesive 35 is applied or the reverse side thereof.

Polyethylene film encapsulation 11 to which the polyethylene film encapsulation handle 31 according to the present invention is applied, it is preferable to use a film made of linear low density polyethylene (LLDPE), together with the polyethylene film encapsulation handle ( It is preferable to use the linear low density polyethylene film of the material of 31).

The surface of the polyethylene film handle 31 to which the adhesive 35 and the printing ink 31 are applied and the surface of the polyethylene film encapsulation 11 in contact with the adhesive 35 are corona discharged to have a surface tension of 40 dyne. / 35 to 45 dyne / cm 2, the adhesive 35 and the printing ink 37 are bonded with sufficient bonding force to the polyethylene film handle 31 and the adhesive 35 is bonded with sufficient bonding force to the polyethylene film bag 11. Thereby, there is no fear that the ink component 37 may be detached from the polyethylene film handle 31 or the polyethylene film handle 31 may be detached from the polyethylene film bag 11.

In addition, since the material of the handle 31 is made of the same polyethylene film as the bag 11, the handle 31 can also be reproduced together when the bag 11 is regenerated, so that the regeneration efficiency of the bag 11 can be improved. In addition, it is possible to prevent the environmental pollution due to the disposal of the handle (31).

According to the handle for polyethylene film encapsulation according to the present invention described above, the handle is formed of the same polyethylene film as the encapsulation, and the low bonding force between the ink component and the adhesive of the polyethylene film is due to an increase in the surface tension of the polyethylene film by corona discharge treatment. By increasing by this, not only can the handle be regenerated with the film bag, but also there is an effect that there is no fear that the printing of the handle is damaged or the handle is detached from the film bag.

Claims (2)

In the handle for carrying a polyethylene film bag, which is adhered to both sides of the polyethylene film bag by an adhesive, the handle 31 is made of a polyethylene film, and the surface on which the printing 37 of the handle 31 is made and the polyethylene film bag. (11) and the adhesive surface 35 of the handle 31 is a polyethylene film sealing handle, characterized in that the surface tension is 40dyne / ㎠ to 45dyne / ㎠ by the high-pressure direct current discharge treatment. The handle for polyethylene film encapsulation according to claim 1, wherein the polyethylene film bag and the handle are made of linear low density polyethylene.

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