JPS5821201B2 - How to make a tape measure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method for manufacturing a tape measure,
After applying an elastomer adhesive to the entire surface of the metal strip, it is coated with a black thermoplastic synthetic resin using an extruder, then a transparent or black elastomer adhesive is applied to the entire surface, and then a photosensitive polymer is applied. Furthermore, a scale is printed on the surface using ink that blocks the transmission of ultraviolet rays, and the printed surface is irradiated with ultraviolet rays to photosensitively solidify the non-printed areas, and the resin on the scale is removed with a cleaning solution to form concave scales. The gist of this method is to obtain a synthetic resin and apply a transparent synthetic resin paint to the entire surface thereof.

In order to protect the scales and the scales applied to the tape measure material in length measuring tapes, the scales are printed using oxidative polymerization type or ultraviolet curable ink type, and the surface is coated with a transparent paint made of thermosetting resin. Alternatively, there are known methods in which the scale printing surface is coated with an abrasion-resistant resin such as polyamide resin or polyvinyl chloride resin instead of a transparent paint, or a method in which a cresol-based transparent ink is directly printed on the polyamide resin coating layer. However, because of the purpose of use, a tape measure for length measurement requires a clear scale at all times, and the scale of the tape measure coated with the above-mentioned transparent paint is easily worn out after a relatively short period of use. Tape measures coated with polyamide resin or polyvinyl chloride resin have the disadvantage that the coating layer gradually peels off because the adhesion between the scale surface and the coating layer is not always good. Due to printing technology, tape measures with graduations of 115 to 1/3 of the thickness of the polyamide resin layer cannot pass through, and the scale becomes unclear after long-term use.

The present invention is an epoch-making method for manufacturing a tape measure that solves the above-mentioned problem of indistinctness due to wear of the scale of the tape measure.According to the present invention, the depth of the concave portion of the concave scale is equal to the thickness of the coating film when the photosensitive resin is applied. Not only is it possible to obtain scales with deep recesses, but since the scale itself is made of a black synthetic resin coating, it is extremely abrasion resistant, and the scale does not wear out, making it extremely durable. This is what gives you a tape measure.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, a nitrile rubber adhesive 2 is applied to a hardened steel strip 1 of SK5 with a thickness of 0.1:3+m and a width of 10 mm to a thickness of about 10 μm. Apply it evenly over the entire surface and dry for several minutes at a temperature of around 150℃.
Next, the same material was heated for several tens of seconds at a temperature of around 300°C to vulcanize the nitrile rubber, and then immediately covered with black colored polyamide resin 2 using an extruder. Then, apply a polyester-based thermoplastic elastomer adhesive 4 to a thickness of about 10 μm on the entire surface of the same material, and then apply a photosensitive unsaturated polyester resin solution 5 to a thickness of 0.15 to 0.0 μm using an ordinary coating machine. , 2μ thick and dried in an infrared drying oven.

After that, the scale 6 is printed using black printing ink that is dissolved in an alcohol solvent and does not transmit ultraviolet rays, and immediately irradiated with ultraviolet rays in the wavelength range of 3000A to 4000A to harden the photosensitive areas 7 other than the black scale, and then The same material is immersed in a methanol solution for several minutes to completely remove the scale ink 6, and the remaining alcohol content is evaporated and diffused (use of ultrasonic waves is effective in removing black scale ink). To remove the resin 8 from the unexposed area, the resin 8 is immersed in a caustic soda solution with a pH of 8 to 10, washed out, and then a transparent paint 9 (clear) made of urethane resin polyester resin is applied to the entire surface to obtain a finished product. be.

[Brief explanation of drawings]

The drawings show an embodiment of the method for manufacturing a tape measure according to the present invention, in which FIGS. 1 to 7 are cross-sectional views showing the steps in order, and FIG. 8 is a perspective view showing the finished product. 1...Steel strip, 2...2) IJ rubber adhesive 3...Polyamide resin, 4...
...Elastomer adhesive, 5...Photosensitive unsaturated polyester resin solution, 6...Graduation ink, 7
・・・・・・Parts other than black scale, 8：Unexposed area resin, 9：Transparent paint.

Claims (1)

[Claims] 1 After applying an elastomer adhesive to the entire surface of the metal strip, it is coated with a black thermoplastic synthetic resin using an extruder, then a transparent or black elastomer adhesive is applied to the entire surface, and then a photosensitive polymer is applied. Then, scales are printed on the surface using ink that blocks the transmission of ultraviolet rays, the printed surface is irradiated with ultraviolet rays to photosensitively harden the non-printed areas, and the resin on the scales is removed using a washing solution. A method for manufacturing a tape measure, characterized by obtaining a concave scale and applying a synthetic resin transparent paint to the entire surface thereof.