JPH0641264Y2 - Display label for polyethylene net - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a display label for polyethylene nets, particularly on the surface of a net-shaped container such as a polyethylene net bag where it has been difficult to use an adhesive label. The present invention relates to a label that can be reliably attached.

(Prior Art and Problems to be Solved) A net made of polyethylene can be easily and inexpensively manufactured as a tubular net bag by extruding a molten polyethylene resin as a large number of yarns from a rotary extrusion die or the like. Due to its elasticity and breathability,
Widely used as a container for vegetables and chicken eggs.

The products filled in such net-shaped containers tend to be handled in large quantities in the distribution process of the market in recent years, and accordingly, the names of the products contained in individual net bags are the same as in the case of a normal package. It is required to attach a label that displays various information such as contents and shipping origin to the surface of the net.

Conventionally, as this type of display label, a so-called sticky label in which a pressure-sensitive adhesive is applied to a paper label base material has been used, but such a label is generally applied to polyethylene that constitutes a net as an adherend. Does not adhere well to
Moreover, since the surface to be adhered is a net made of yarn, the effective adhesion area is small and reliable adhesion is difficult.

In order to solve such a problem, the present inventors have developed a technology for thermally adhering a display label having a heat-sensitive adhesive layer formed on the back surface to the net surface, and have previously proposed it (Japanese Patent Application No. 63-126).
No. 55). According to such means, the heat-sensitive adhesive on the back surface is easily welded to the polyethylene net as the adherend due to the heating at the time of sticking the label, and the adhesiveness is much more reliable than that of the sticky label. can get.

However, in order to firmly adhere the label to the thin yarn portion of the net, it is desirable to cause some melting also on the polyethylene net side during welding so as to fix the both in a compatible state. It is necessary to set the heating temperature and time to some extent.

For this reason, an actual pasting device requires a means for preheating, and if the heating temperature is raised too high in order to shorten the heating time, the polyethylene net may be caught or melted in some cases. If defective products are generated in the continuous net labeling process, the correction work becomes complicated, so heat management must be extremely strict.

In addition, since a low-melting point component such as EVA wax is often used for the heat-sensitive adhesive of the display label, stickiness may occur on the label surface during storage of the label depending on ambient conditions, which may cause difficulty in handling.

Therefore, it is further desired to develop a display label that can be reliably and quickly bonded to a polyethylene net and that is easy to manufacture and handle.

(Means for Solving the Problem) The problem of the conventional technology is that in a display label that is attached to a net-shaped container made of polyethylene, a support sheet and a substantially detachable support sheet are provided on the support sheet. A polyethylene net label comprising a display film label made of an ethylene polymer, and an ultrasonic welding region for a polyethylene net being formed at a peripheral portion of the film label.

(Operation) In the present invention, each of the film labels substantially made of ethylene polymer is supported on the support sheet in a releasable manner, and is aligned with a predetermined attaching position on the surface of the polyethylene net, and Ultrasonic irradiation is performed from the surface side of the support sheet using an ultrasonic horn having an irradiation area having a shape corresponding to the ultrasonic welding area. Then, the film label substantially made of ethylene polymer and the net made of polyethylene are fused to each other, and when the support sheet is peeled off, the film label is fixed and remains at a predetermined position on the net. In this case, the welding by ultrasonic irradiation does not necessarily have to be performed over the entire peripheral portion of the film label, and it is sufficient to fuse only the main portion to the net.

In the present invention, the supporting sheet is formed from a thermoplastic resin film having a melting point higher than that of the ethylene polymer of the film label and a material different from that, and the molten ethylene polymer is used as the supporting sheet. It is desirable to form the above-mentioned film label for display by melt-bonding to one surface at a temperature such that it can be peeled off after being cooled and solidified.

For example, the thermoplastic resin as the support sheet is a transparent oriented polypropylene (hereinafter referred to as OPP), while polyethylene as an ethylene polymer is lower than the lamination temperature of ordinary polyethylene, for example, 280 ° C to 3 ° C.
When laminated at about 15 ° C and cooled and solidified, the formed polyethylene laminate layer is always integrated with the OPP film due to partial compatibility during melting. 100g / 2.5c
It can be easily peeled with a peeling force of about m (hereinafter such a special bonding form is referred to as lead bonding).

Polyethylene is the most readily available material as an ethylene polymer, but ethylene
-A compound containing a monomer such as olefin or vinyl acetate is also used.

The support sheet may be made of a material different from the ethylene polymer of the film label, and if it is a thermoplastic resin having a higher melting point than OPP, polyethylene terephthalate or the like may be used. it can.

In an actual label, for example, a laminate obtained by laminating polyethylene as a film label on an OPP film is subjected to a predetermined display printing from the film label side, and then a half die cut is performed at a predetermined shape and spacing of the display label to form a polyethylene layer. OPP as a supporting sheet by removing other parts of the
A polyethylene film label having a predetermined shape is arranged on the film in a lead-bonded state.

When adhering to a polyethylene net, the film label side of this laminate is brought into contact with the net and ultrasonic waves are applied from the OPP film side along the shape of the label periphery, and then OPP
Individual film labels are adhered on the net by continuously peeling off only the film.

In the present invention, the film label is bonded to the support sheet by lead bonding as described above, and, for example, a polyethylene film or the like as a film label via a pressure-sensitive adhesive layer on the release treated surface of silicon release paper. It is also possible to use a bonded product.

In this case, it is necessary to apply the pressure-sensitive adhesive to the film label side and to subject the silicone release paper to a release treatment such that the adhesive layer always remains on the film label side during release.

After removing the release paper after adhering the film label to the net surface, the adhesive layer on the film label surface is exposed,
An arbitrary paper label or the like having a predetermined display printing can be attached to the adhesive surface.

Embodiment Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings.

As shown in Figs. 1 and 2, a transparent film with a thickness of about 50μ
Die temperature of polyethylene is about 300 for OPP film 1.
The transparent film layer 2 having a thickness of about 50 μm was formed by subjecting to heat extrusion at 0 ° C. and cooling and solidification. OPP film 1 of this film layer 2
The peel strength (180 ° peel) was about 100 g / 2.5 cm.

Next, the surface of the film layer 2 is subjected to display printing of a required bar code 3 and the like, and further, half die cutting is performed from the side of the film layer 2 of the laminated body, and scraping is performed, so that the OPP film 1 as a support sheet As a result, transparent polyethylene film labels 4, 4, ... Arranged in a predetermined shape and at intervals were obtained. In this case, the printed surface of the bar code 3 or the like of each label 4 is the side facing the polyethylene net, which will be described later, and is welded, so that the display print can be read transparently from the front side of the label 4 after adhering to the net. It is given in any direction.

Then, as shown in FIG. 3, a flat shaping table 7 is preliminarily attached to the pull-out end of the cylindrical polyethylene net 5 continuously supplied from the net manufacturing apparatus (not shown) through the roll 6.
And is supplied to the ultrasonic welding station S in the direction of the arrow in the figure as a planar shape. On the other hand, the OPP film 1 as the support sheet formed as described above is continuously supplied through the roll 6 in such a direction that the film labels 4, 4, ... On the lower surface side face the net 5, At a predetermined position of the ultrasonic welding station S, the horn 8 of the ultrasonic irradiation device, which is processed so as to match the shape of the ultrasonic welding area 4A on the periphery of the film label 4, is passed from the upper surface side of the OPP film 1 through the film label 3 The net 5 is irradiated with ultrasonic waves.

As a result, the peripheral portion 4A of each film label 4, 4, ... And the corresponding portion of the net 5 are made compatible with each other by ultrasonic energy and fixed to each other.

In this case, the film label 4 and the net 5 made of the same kind of ethylene polymer are integrated rapidly and firmly, but almost no fusion is formed between the OPP film 1 and the polyethylene film label 4 made of different materials. OPP film 1 that does not occur, and therefore after ultrasonic irradiation, as a support sheet
Is peeled off from the net 5 side, only the film label 4 remains fixed on the net 5. In this case, the peripheral edge portion 4A of the film label 4 is extremely quickly and surely welded by the ultrasonic irradiation from the horn 8 having the same shape, and the welding occurs instantly and uniformly. Preheating means etc. are not required.

Also, since the irradiation energy is mostly concentrated only on the peripheral portion 4A of the label directly below the horn, energy loss due to heat diffusion to the periphery as in the case of normal heat sealing or bending of the label itself due to heat transfer and other related members etc. Transformation,
There is no risk of damage.

Further, since the ultrasonic irradiation is applied only during welding, it is not necessary to constantly energize and heat unlike a heat seal head, and electric power is effectively used.

In the embodiment of the present invention, the printing surface of the bar code 3 or the like faces the net 5, that is, the transparent label 4
Since it is protected from the outside by itself, there is no possibility that the printed surface will be damaged from the outside even if no processing such as over-lamination is performed.

As shown in FIG. 4, the label of the present invention is a film label such as a polyethylene film in which a silicone release paper 11 is used as a supporting sheet instead of the OPP film, and a pressure sensitive adhesive 12 is applied to the back surface of the release treatment. You may make 13 adhere | attach and fuse this to a net.

In this case, the film label 13 functions as a base material to which a normal label paper is later attached from its upper surface.

That is, ultrasonic waves are applied from the surface side (upper side in the drawing) of the release paper 11 in the same manner as in FIG. 2 to weld the peripheral edge portion 13A of the film label 13 to the net, and then the release paper 1
Except for 1, the adhesive layer 12 is exposed on the upper surface of the film label 13 adhered to the net, so that a paper label or the like with appropriate printing may be attached to this portion.

In this embodiment, the user simply attaches the label paper or the like printed according to each product to the attaching surface of the film label already adhered to the net, particularly in the case of a small lot, the display film. The sticking equipment and work labor of are significantly reduced.

(Effect of the Invention) As described above, according to the present invention, the display label can be reliably and easily adhered to an adherend such as a polyethylene net.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cross section in the manufacturing process of the display label of the present invention, FIG. 2 is a plan view of the display label, FIG. 3 is a sectional view showing a manufacturing process of the display label of the present invention, and FIG. FIG. 6 is a cross-sectional view showing another manufacturing process of the display label of the present invention. 1 …… Support sheet (OPP film) 2 …… Film label layer (PE layer) 3 …… Printing part (bar code) 4 …… Film label 4A …… Ultrasonic welding area 5 …… Polyethylene net 6 …… Roller 7 …… Shaping table 8 …… Ultrasonic horn 9 …… Roller 10 …… Roller 11 …… Support sheet (release paper) 12 …… Pressure-sensitive adhesive 13 …… Printing part 13A …… Ultrasonic welding area

Claims (5)

[Scope of utility model registration request] 1. A display label attached to a polyethylene net-like container, which comprises a support sheet (1) and a substantially ethylene polymer which is releasably provided on the support sheet (1). A label for polyethylene net, comprising a film label (4) for display, wherein an ultrasonically welded area (4A) to the polyethylene net (5) is formed on the peripheral edge of the film label (4). 2. The support sheet (1) is a thermoplastic resin film having a higher melting point and made of a different material than the ethylene polymer of the film label, and the film label (4) is a molten ethylene polymer. The display label according to claim 1, wherein the display label is formed by bonding one surface of the support sheet (1) at a temperature such that the support sheet can be peeled from the surface after being solidified by cooling. 3. The display label according to claim 2, wherein the thermoplastic resin of the support sheet (1) is transparent oriented polypropylene, and the film label (4) is transparent polyethylene. 4. The display film according to claim 2, wherein the thermoplastic resin of the support sheet (1) is transparent polyethylene terephthalate, and the film label (4) is transparent polyethylene. 5. The support sheet (1) is a release-treated sheet, and the film label (4) is attached to a release-treated surface of the support sheet (1) via a pressure-sensitive adhesive layer. The display label according to claim 1, wherein