JPH07309414A - Conveying belt - Google Patents

Abstract

PURPOSE:To provide a conveying belt by which adhesive strength of a transparent sheet to be layered on a mark is significantly improved than a conveying belt having a direct printed mark and whose transparent sheet is hardly separated even if it is used over a long period of time. CONSTITUTION:A first tensile body 4 and a first elastomer sheet 3 are layered on each other, and a mark 2 composed of dots is printed on a surface of the first elastomer sheet 3, and a transparent sheet 1 is also layered on it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor belt for so-called light transportation, which is used in, for example, a light electric device assembly process, a food processing process and the like. This type of transport belt may be required to have a function of transporting a transported product as well as a function of performing processing, processing such as assembling, molding, and sorting during transportation. Therefore, in order to make it easier to understand the position of the transported object, the contents of processing, etc., the positioning mark, P
An R mark, a trademark, etc. (hereinafter simply referred to as a mark) are displayed.

[0002]

2. Description of the Related Art A conveyor belt for light transportation is generally constructed by laminating a thermoplastic elastomer sheet on a tensile body. Conventionally, when a mark is displayed on the conveyor belt, the surface of the thermoplastic elastomer sheet is handwritten, printed or transferred with an ink, a paint or the like of a predetermined color containing a material similar to the thermoplastic elastomer. It was In addition, a conveyor belt in which a mark is displayed on a thermoplastic elastomer sheet as described above and a transparent plastic is coated on the mark is described in Japanese Utility Model Laid-Open No. 2-69610.

[0003]

However, there are the following problems in the above-mentioned conventional conveying belt having the mark display.

First, in the case of a conveyor belt in which only a thermoplastic elastomer sheet is printed with ink or the like, the marks are directly contacted with the conveyed object to be worn and peeled off, and stable and clear display is maintained for a long period of time. I can't. Further, when used in a food processing process, the mark is brought into direct contact with a conveyed product, which is restricted by the Food Sanitation Law, and the use of the belt is restricted by the composition of the ink (colorant, solvent, medium, etc.).

In the conveyor belt in which the transparent plastic is laminated on the mark, the restriction on the food composition in regard to the ink composition can be solved, but the problem of the adhesive force between the ink and the transparent plastics occurs. In other words, the ink composition that emphasizes the adhesive force with the thermoplastic elastomer is not always sufficient in the adhesive force with the transparent plastic, and when it is used as a conveyor belt, it undergoes bending, stretching, etc. Between the transparent plastic and the transparent plastic is easily peeled off, and the transparent plastic may be peeled off within a short period of time after the start of use.

The present invention has been made in view of the above points, and the adhesive force of a transparent sheet laminated on a mark is significantly improved as compared with a conventional transporting belt having a solid-printed mark, and a long time is required. It is an object of the present invention to provide a conveyor belt in which a transparent sheet does not easily peel off even when used.

[0007]

In order to achieve the above object, the conveyor belt of the present invention comprises a tensile body and an elastomer sheet laminated on each other, and a mark formed of dots is printed on the surface of the elastomer sheet. , And a transparent sheet is laminated on it.

According to a second aspect of the present invention, in the conveyor belt of the present invention, the density of the dots is 100 to 400 per square centimeter, and the size of the dots is 0.2 to 0.8 mm. It is preferable that

[0009]

According to the conveyor belt of the present invention having the above-mentioned structure, the tensile body serves as a core body of the conveyor belt and has an effect of supporting and conveying an object when suspended between pulleys.
The elastomer sheet is located between the load and the tensile body to prevent abrasion and contamination of the tensile body by the load, and further, the load can be stably placed on the transport belt and transported. It has a function of imparting a suitable friction coefficient and elasticity. The mark serves as a quality assurance, a source display, an advertisement, etc. by displaying a position on which a transported article is placed (positioning mark), displaying a trademark, PR characters, and the like. The transparent sheet has a function of covering the mark, improving its durability, and preventing contamination of the transported object.

Since the mark of the conveyor belt of the present invention is composed of dots, the contact area per unit area between the mark (ink layer) and the transparent sheet is reduced and dispersed to make the mark transparent. It is possible to prevent a decrease in the adhesive force between the sheet and the elastomer sheet. This is because, as described above, the adhesive force between the mark and the transparent sheet is usually weaker than the adhesive force between the elastomer sheet and the transparent sheet.

Then, the density of dots forming the mark,
By limiting the size as described in claim 2,
This action can be made more reliable. That is, the dot density is 100 per square centimeter.
When it is less than the number of characters, the character becomes unclear and the details cannot be expressed and the character is not formed. On the other hand, when it exceeds 400, it becomes similar to the so-called solid printing and the adhesive strength is hardly improved. If the dot size is less than 0.2 mm, the character is unclear (lack of density), but if it exceeds 0.8 mm, the details of the character cannot be expressed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the conveyor belt of the present invention will be described below with reference to FIGS.

FIG. 1 is an enlarged sectional view showing a part of a conveyor belt according to the present embodiment, and FIG. 2 is an enlarged view of one of the marks shown by dots in the conveyor belt of FIG. It is a top view shown.

First, the overall construction of the conveyor belt of the present invention will be briefly described with reference to FIG. As a tensile body, two layers of a first tensile body 4 and a second tensile body 6 are provided, and each of them uses a plain polyester fabric in this example. Depending on the application, aramid fiber, nylon fiber, cotton yarn, or a blended fiber thereof is also used. The first elastomer sheet 3 laminated on the first tensile body 4 has a function of protecting the first tensile body 4 and holding a transported object. The second elastomer sheet 5 is the first
It intervenes between the tensile body 4 and the second tensile body 6 to bond them to each other and to impart a certain rigidity in the belt width direction. The type of elastomer used is the first
-Polyurethane is used in this example, although it is selected depending on the properties of the second tensile members 4 and 6 and the carried object.
In addition, soft vinyl chloride, polyester and the like can be used by applying an adhesive treatment to the tensile members 4 and 6 such as applying an adhesive.

The first elastomer sheet 3 with the mark 2 in between.
The transparent sheet 1 to be laminated on is transparent to the extent that the sandwiched mark 2 can be read clearly, is a material that is easily adhered to the first elastomer sheet 3, and is a material that does not contaminate a transported object. is necessary. Therefore, a material similar to the material of the first elastomer sheet 3 is usually used, and in this example, a polyurethane sheet having a thickness of 0.3 mm and having excellent transparency is used. These laminating methods are carried out by using an ordinary laminating method, for example, a rotary press method, or after pressure bonding the first elastomer sheet 3 formed by the T die method to the first tensile body 4 which is continuously fed out. The method of cooling is adopted.

As shown in FIG. 2, the mark 2 on the first elastomer sheet 3 has 144 marks per square centimeter.
It is composed of individual dots 7. Then, the change in the adhesive force due to the structure (printing method) of the mark 2 is confirmed.

After printing the example mark 2 on the first elastomer sheet 3 (polyurethane), the transparent sheet 1 (transparent polyurethane) is laminated thereon. The printing uses screen printing, and the size of each dot 7 is 0.5 mm, and the dot density is 14 per square centimeter.
The number was set to 4 (12 per 1 cm).
The ink used is SK-9100 green, a printing ink for food packaging materials, based on the NL standard of the Printing Ink Industry Liaison Committee.

Comparative Example The same first elastomer sheet 3 as in the above example was subjected to so-called solid printing (conventional printing in which the ink is placed on the entire surface) using the same printing ink (SK-9100 green) as in the example, The same transparent sheets 1 as in the example were laminated.

The measuring method of the adhesive force is JIS K-630.
1 "Vulcanized rubber physical test method" (5) According to peeling test. The results are shown below.

Adhesive force of Example = 70 Newton / inch Adhesive force of Comparative Example = 24.5 Newton / inch As is clear from the above-mentioned comparison result, the mark 2 of the conveyor belt of the present invention is formed by a large number of dots 7. By being configured and printed, the adhesive force between the first elastomer sheet 3 and the transparent sheet 1 was significantly improved, and it was sufficiently durable for long-term use.

By the way, the density and size of the dots 7 constituting the mark 2 shown in the above embodiment are merely examples, and are not particularly limited. Similarly, the sheet 1 in which the printing ink of the mark 2 is also used. It can be selected as appropriate according to the synthetic resin material of 3.

[0022]

As described above, according to the conveyor belt of the present invention, compared to the conventional mark only for direct printing, the transported object is naturally contaminated or the mark is worn and becomes unclear. The problem is solved. Further, the adhesive strength of the mark is significantly improved as compared with the so-called solid printing mark, and the period of use of the transport belt is significantly improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an enlarged part of a conveyor belt according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view showing one of the marks displayed by dots on the carrying belt of FIG.

[Explanation of symbols]

 1 Transparent sheet 2 Mark 3, 5 Elastomer sheet 4, 6 Tensile body 7 dots

Claims (2)

[Claims] 1. A laminate of a tensile body and an elastomer sheet,
A conveyor belt characterized in that a mark composed of dots is printed on the surface of the elastomer sheet, and a transparent sheet is further laminated thereon. 2. The conveyor belt according to claim 1, wherein the density of the dots is 100 to 400 per square centimeter, and the size of the dots is 0.2 to 0.8 mm.