JPH05262360A - Photoelectric tube detecting mark - Google Patents

Abstract

PURPOSE:To make the contrast with a base color at the time of positioning clearer, and make the color to be the same as the base color after heating by constituting the title mark, which positions the surface pattern of a liquid filling container, of a thermal discoloring ink which presents a specified tone at a normal temperature and changes irreversibly into a tone by heating at a specified temperature. CONSTITUTION:For example, on the surface of a plastic tube 1 made of a pink low density polyethylene, a printed image 3 of patterns or characters, etc., is formed, and at the same time, at the upper end of the tube 1, a black green photoelectric tube detecting mark 5 is printed by a thermal discoloring ink made of a mixture of NiCO3 and CdS. At the time of positioning of the tube 1, in which a content has been filled, the mark 5 presents a black green color, and the contrast to the base color of the tube 1 is clear, and the detection can be easily done by a photoelectric tube. Then, the upper end opening of the tube 1 is attached to a fixing plate 6, and when the tube 1 is heated and fused, the mark 5 is irresversibly discolored into pink by this heating, and becomes the same color with the base color, and the mark 5 vanishes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoelectric tube detection mark formed for aligning a pattern or the like on the surface of a plastic tube container filled with liquid, cream or the like.

[0002]

2. Description of the Related Art Generally, plastic tube containers are
As shown in FIG. 8, a neck portion 22 is provided in the lower end opening of the tubular body 21, a cap 23 is attached to the neck portion 22 to close the opening of the neck portion 22, and then liquid or cream is filled from the upper end opening. It is like this. On the surface of the cylindrical body 21, symbols, quality indications, etc. are formed by printing, and a photoelectric tube detection mark 24 is formed on the upper end of the cylindrical body 21 so that the symbols and the like are not displaced. Then, the photoelectric tube detection mark 24 is detected by a light reflection type or light transmission type photoelectric tube, the cylindrical body 21 is mechanically aligned, and the inner peripheral surface of the upper end opening of the cylindrical body 21 is aligned and heated. Is being blocked.

[0003]

However, the conventional photoelectric tube detection mark is a color having a clear contrast with the ground color of the plastic tube container and the size of the mark is 3 as well.
If printing is not performed with a size of about 7 mm × 7 mm, it cannot be accurately detected by the photoelectric tube. For this reason, a mark which is unfavorable in terms of design is formed on the surface of the plastic tube container, and the overall design becomes inconsistent. Conversely, focusing on the design of the plastic tube container,
If the upper end opening of the cylindrical body 21 is closed without printing the photocell detection mark, a complicated process is required and productivity is reduced. On the other hand, when the product is hermetically packaged by the tubular body made of the heat-shrinkable film, as shown in FIG. 9, the photoelectric tube detection mark 24 is provided for aligning the product 25 and the design 27 of the tubular body 26.
Is required. However, like the plastic tube container, the finished product has marks 24 which are unfavorable in terms of design, and the overall design is not uniform.

The present invention has been made in view of the above circumstances, and has a clear contrast with the ground color of a plastic tube container or the like at the time of alignment and has the same color as the ground color when heated to a predetermined temperature. Provided is a photoelectric tube detection mark that changes in color and whose color does not change even after returning to room temperature.

[0005]

In order to achieve the above object, the photoelectric tube detection mark of the present invention exhibits a predetermined color tone at room temperature and changes to another color tone when heated to a predetermined temperature and at room temperature. It is composed of an irreversible thermochromic ink whose color tone does not change even when returned.

[0006]

That is, the present inventors have made a series of steps in order to manufacture a plastic tube container or the like in which no complicated process is required at the time of manufacture, the productivity is not lowered, and the photoelectric cell detection mark which is unnecessary in design does not appear on the surface. Researched. as a result,
The photocell detection mark has a clear contrast with the background color of the container at room temperature, changes to another color tone when heated to a predetermined temperature, and does not change even after returning to room temperature Irreversible thermal discoloration It has been found that the use of a conductive ink allows plastic containers and the like to be manufactured in the current manufacturing process without lowering the productivity, and that the photocell detection mark, which is unnecessary for design, does not appear in the product. The invention has been reached.

The present invention will be described below.

The photoelectric tube detection mark of the present invention is an irreversible thermochromic ink that exhibits a predetermined color tone at room temperature, changes to another color tone when heated to a predetermined temperature, and does not change even after returning to room temperature. It is configured.

The irreversible thermochromic ink described above is not particularly limited, and conventionally known products can be used as they are. For example, NiCO ₃ and Cd
Examples thereof include a mixture of S, a metal salt such as CoSiF ₆ , CdCO _{3 and the} like, which contains a thermochromic dye that discolors at a high temperature. In addition, examples include those containing a dye, which is a dispersion of an electron-accepting compound and an electron-donating compound, and a general dye. Specific examples of the electron accepting compound include leuco dyes, and examples of the electron donating compound include phenol compounds.

The irreversible thermochromic ink constituting the photoelectric tube detection mark loses its color tone depending on the temperature in the process of heating the plastic tube container, film, etc. (the same color as the background color of each container, film). become)
The thing is selected suitably.

Next, examples will be described.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a plastic tube container manufactured using the phototube detection mark of the present invention. In this plastic tube container, a neck portion 2 is formed in a lower end opening of a tubular body 1 made of pink low-density polyethylene, and the upper end opening is heated and closed with its inner peripheral surfaces aligned. On the surface of the cylindrical body 1, there are axially symmetrical patterns,
A printed image 3 such as characters is formed. In addition, 4 is a cap that is attached to the neck.

The plastic tube container is manufactured, for example, as follows. First, the melting temperature is 1
Using a low-density polyethylene colored in pink at 10 ° C., as shown in FIG. 2, a tubular body 1 is extruded and the surface of the tubular body 1 is subjected to corona treatment. Next, as shown in FIG. 3, a printed image 3 such as a design or a character is printed on the surface of the cylindrical body 1 with a normal ink, and at the same time, a thermochromic ink (Daithermo PI-140 manufactured by Dainichi Seika Kogyo Co., Ltd.) is printed. , A black-green photoelectric tube detection mark 5 is printed on the upper end side of the tubular body 1 at a thermal discoloration temperature of 140 ° C.). Then, a neck portion 2 is formed in the lower end opening of the tubular body 1 by insert molding, a cap 4 is capped on the neck portion 2 to close the opening, and then the tubular body 1 is closed.
Fill the inside with cream from the top opening. In this state, the photoelectric tube (not shown) detects the photoelectric tube detection mark 5,
After aligning the tube containers, as shown in FIG. 4, the fixing plate 6 is attached by aligning the inner peripheral surface of the upper end opening of the tubular body 1, and the upper end of the tubular body 1 is heated to 450 to 550 ° C. It is heated to 140 ° C. by the nichrome heater and melted. By this heating, the photoelectric tube detection mark 5 is thermally discolored to pink which is the same as the ground color of the tubular body 1, and the mark 5 disappears. Then, as shown in FIG. 5, after the crimping plate 7 is attached and the upper end opening is crimped, the fixing plate 6 and the crimping plate 7 are removed to obtain the plastic tube container shown in FIG.

As described above, the photoelectric tube detection mark 5 is black-green at room temperature, and when it is heated, the color changes to pink, which is the same as the ground color of the plastic tube container, and does not change from pink even after returning to room temperature. Composed of ink,
On the surface of the obtained product, the photoelectric tube detection mark 5 which is unnecessary for design does not appear. Therefore, the design uniformity of the entire product is not impaired. Further, it is possible to manufacture a plastic tube container in which the photoelectric tube detection mark 5, which is unnecessary in terms of design, does not appear in the same manufacturing process as usual, without requiring complicated steps and maintaining productivity.

FIG. 6 shows another embodiment of the present invention. That is, in the figure, 8 is a cosmetic container, and 9 is a heat-shrinkable vinyl chloride resin film material for hermetically packaging the cosmetic container. A printed image 3 such as characters is formed on the surface of the film material 9.

As described above, the cosmetic container 8 is attached to the film material 9
In the case of hermetically sealing by sealing, as shown in FIG. 7, a portion of the cylindrical body 10 made of a vinyl chloride resin film is solidly printed on one end opening of the surface except for the photoelectric tube detection mark 5 with ordinary blue ink, and At the same time as printing a printed image 3 such as a pattern or letters on ordinary ink, thermochromic ink (Daither Seika Kogyo Co., Ltd., Daithermo DI-70, thermochromic temperature 90 ° C)
The colorless photoelectric tube detection mark 5 is printed with. Next, after arranging the cosmetic container 8 inside the cylindrical body 10, the photoelectric tube detection mark 5 is detected by a photoelectric tube (not shown), and the cosmetic container 8 is aligned. Then, hot air of about 90 ° C. is blown onto the tubular body 10 to cause the tubular body 10 to thermally contract.
As a result, as shown in FIG. 6, the photoelectric tube detection mark 5 is thermally discolored to blue and disappears, and the cosmetic container 8 is hermetically packaged with the film material 9.

[0017]

As described above, the photoelectric tube detection mark of the present invention exhibits a predetermined color tone at room temperature, changes to another color tone when heated to a predetermined temperature, and changes even when the temperature returns to room temperature. Not composed of irreversible thermochromic ink. Therefore, according to the present invention, for example, a plastic tube container without a phototube detection mark can be manufactured by a normal manufacturing process. In addition, when the product is hermetically sealed with the heat-shrinkable film material, the product can be hermetically sealed in a state in which the photoelectric tube detection mark, which is unnecessary in design, does not appear.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a plastic tube container obtained by the present invention.

FIG. 2 is an explanatory diagram of a manufacturing process of the above embodiment.

FIG. 3 is an explanatory diagram of a manufacturing process of the above embodiment.

FIG. 4 is an explanatory view of the manufacturing process of the above embodiment.

FIG. 5 is an explanatory diagram of a manufacturing process of the above-described embodiment.

FIG. 6 is a perspective view of another embodiment obtained according to the present invention.

FIG. 7 is an explanatory diagram of the manufacturing process of the above embodiment.

FIG. 8 is a perspective view showing a conventional example.

FIG. 9 is a perspective view showing another conventional example.

Claims (3)

[Claims] 1. An irreversible thermochromic ink that exhibits a predetermined color tone at room temperature, changes to another color tone when heated to a predetermined temperature, and does not change even when the temperature returns to room temperature. Phototube detection mark characterized by the following. 2. The irreversible thermochromic ink is Ni
Mixture of CO ₃ and CdS, CoSiF ₆ , CdCO ₃
The photoelectric tube detection mark according to claim 1, which contains a dye consisting of the metal salt of. 3. The photoelectric tube detection mark according to claim 1, wherein the irreversible thermochromic ink contains a dye which is a dispersion of an electron-accepting compound and an electron-donating compound, and a general dye.