JPH06198462A - Marking method to thermosetting resin - Google Patents

Abstract

PURPOSE:To enable the application of markings of the color different from the color of molded goods by irradiating the molded goods with a laser beam. CONSTITUTION:A material contg. a thermosetting synthetic resin selected from either of a urea resin and phenolic resin, silicon and pigments is molded by a direct molding method to obtain the molded goods 4. The surface of the molded goods 4 is irradiated with a laser beam having >=30000kW/cm<2> energy density by using a laser beam source 1 and a deflector 2, by which the white marks 6 are put thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marking method for a thermosetting resin in which the surface of the thermosetting synthetic resin is marked with a laser beam.

[0002]

2. Description of the Related Art Conventionally, as a marking method for attaching characters or symbols to the surface of a molded product of thermosetting synthetic resin,
A method of spraying or printing a liquid printing material having a color different from that of the molded article and then drying the printing material is adopted.

[0003]

In the above conventional method, since the molded product and the printing material for marking are different materials, the molded product and the printing material cannot be completely adhered to each other, and the thermal shock resistance, There is a problem that weather resistance and abrasion resistance are not sufficient. In order to solve such a problem, a method is conceivable in which a character or symbol to be applied at the time of molding a molded product is projected or recessed with respect to the surface of the molded product. However, in this method, it is necessary to provide the mold with a mold corresponding to the letters and symbols, and even if it can be used for the purpose of attaching the same letters and symbols to each molded product, serial numbers etc. are given to mass-produced products. There is a problem that it is not suitable for the purpose.

An object of the present invention is to solve the above-mentioned problems, and by irradiating a molded product after molding with a laser beam, it is possible to engrave arbitrary characters and symbols, and the laser beam An object of the present invention is to provide a marking method for a thermosetting resin, which is capable of developing a character or a symbol in a color different from that of a molded product only by irradiation.

[0005]

According to the present invention, in order to achieve the above object, a material containing a thermosetting synthetic resin selected from urea resin and phenol resin, silicon and pigment is directly pressure-molded. After molding by, the surface of the molded product is irradiated with a laser beam having an energy density of 30,000 kW / cm ² or more for marking.

[0006]

According to the above method, since the molded product of thermosetting synthetic resin contains silicon and pigment, the surface of the molded product is marked by irradiating it with a laser beam having a large energy density. Thus, the surface of the molded product can be engraved with characters or symbols in a color different from that of the molded product. Although the mechanism of color development has not been clarified, silicon, pigment, or their compounds remain without evaporation at the portion where the thermosetting synthetic resin is vaporized by the laser beam to develop white color, or thermosetting It is conceivable that a large number of fine bubbles are formed on the surface of the molded product when carbon contained in the synthetic resin becomes carbon dioxide and evaporates, and this becomes a diffuse reflection surface to develop white color. In any case, it is possible to make a white marking by the above method, and if the thermosetting synthetic resin molded product is colored in another color, it is possible to make a marking with a clear contrast. is there. Further, since the laser beam is irradiated to the molded product after molding, a mold corresponding to the character or symbol to be marked is not required, and moreover, any character or symbol can be marked only by controlling the irradiation position of the laser beam. Therefore, it is possible to engrave a molded product having an arbitrary shape, and it is possible to easily engrave different characters or symbols for each molded product. Furthermore, since the engraved characters and symbols do not use a different material for the molded product, engraving excellent in thermal shock resistance, weather resistance, wear resistance and the like can be performed.

[0007]

FIG. 1 shows an apparatus for carrying out the method of the present invention. A laser beam is generated by a laser light source 1 and is deflected in an arbitrary direction by a deflecting device 2 including a deflecting mirror. The deflection device 2 is controlled by a control device 3 such as a computer, and characters or symbols set in the control device 3 are imprinted on the surface of the molded product 4. The molded product 4 is a product obtained by molding urea resin or phenol resin by a direct pressure molding method,
At least the surface portion contains silicon and a pigment.
Silicon may be contained in the form of a silicon compound. The control device 3 also controls the output of the laser light source 1 through the energy supply device 5, and the laser light source 1 outputs a pulse-modulated laser beam of substantially constant energy. When the energy density of the laser beam on the surface of the molded product was set to 38000 kW / cm ² by the apparatus having such a configuration, the molded product 4
White marking 6 could be made on the surface of the.

The energy density of the laser beam is
You can ask. That is, the power of the laser beam
Is the peak value of P, and the laser beam on the surface of the molded product 4
The energy density ω is ω = P / A, and the laser beam has a period t_r, ON period t_wIn the
Russ-modulated and its average energy is AP
For example, APt_r= Pt_w Therefore, after all, the energy density ω is ω = (t_r/ T_w) -AP / A For example, the average energy of the laser beam
Energy 1W, cycle 200μS, ON period 170
If nS and the spot diameter are set to 200 μm,
By 200 × 10^-6/ (170 x 10^-9) × 1
{(100 × 10 ^-6)²× 3.14} ≒ 37,000kW
/ Cm²And the energy density is about 38000kW /
cm²And the average energy of the laser beam
I know that I should set the value to a value slightly larger than 1W.
It

[0009]

As described above, according to the present invention, a material containing a thermosetting synthetic resin selected from urea resin and phenol resin, silicon and pigment is molded by a direct pressure molding method, and then a molded product is obtained. Energy density of 30,000 kW on the surface
The marking is performed by irradiating with a laser beam of not less than / cm ² and the thermosetting synthetic resin molded product contains silicon and a pigment. By marking the surface of the molded product, it is possible to quickly make a white marking on the surface of the molded product, and if the molded product of thermosetting synthetic resin is colored in another color, a clear contrast will be obtained. There is an advantage that the engraved mark that has been provided can be applied. Further, since the laser beam is irradiated to the molded product after molding, a mold corresponding to the character or symbol to be marked is not required, and moreover, any character or symbol can be marked only by controlling the irradiation position of the laser beam. Therefore, it is possible to engrave a molded product having an arbitrary shape, and it is possible to easily engrave different characters and symbols for each molded product. Further, since the engraved characters and symbols are not formed by using a different material for the molded product, there is an effect that engraving excellent in thermal shock resistance, weather resistance, abrasion resistance and the like can be performed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laser light source 2 Deflection device 3 Control device 4 Molded product 5 Energy supply device 6 Stamp

Claims (1)

[Claims] 1. A thermosetting synthetic resin selected from urea resin and phenol resin, a material containing silicon and a pigment are molded by a direct pressure molding method, and the energy density is 30,000 kW / cm on the surface of the molded product. A marking method for a thermosetting resin, which comprises marking by irradiating a laser beam of ² or more.