JPH11156871A - Production of plastic molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for continuously producing a plastic molded article having proper rigidity. SOLUTION: When a metal cylinder 1 having recessed parts 11 formed on the surface thereof is rotated, a pasty resin is applied to the surface of the metal cylinder 1 by a coating roll 2 and the excessive pasty resin 3 is scraped off by a doctor knife 5. The pasty resin 3 filled into the recessed parts 11 is gelled by the heating of an infrared ray burner 6 and cooled at the position of a cooler 7. Whereupon, the pasty resin 3 is solidified in the shape along the recessed parts 11. After the solidified pasty resin is temporarily bonded to an unplasticized film 10, the unplasticized film 10 is separated from the metal cylinder 1 to take out a plastic molded article 31 having the shape corresponding to the recessed parts 11 from the recessed parts 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a plastic molded article such as an emblem of an automobile or a motorcycle.

[0002]

2. Description of the Related Art Emblems for automobiles and motorcycles are generally manufactured by injection molding of ABS resin. For example, carbon black is kneaded with an ABS resin when colored black, and titanium oxide is mainly kneaded and used when colored white. The surface is often finished in silver by plating, vacuum deposition or foil transfer of metallic chromium, and paint is also sprayed.

[0003]

However, the emblem manufactured using the ABS resin as described above is hard and has no plasticity. Therefore, it is necessary to make the emblem according to the curvature and shape of the mounting surface. Therefore, each mold for each shape of the mounting surface is required, and the mold for the emblem must be remodeled every time the car or motorcycle is changed. Therefore, there is an increasing demand for a technology capable of avoiding a cost increase accompanying this.

The following is disclosed as a method for producing a molded article using a synthetic resin. For example, as a method of manufacturing a plastic molded product used for furniture decoration, Japanese Patent Publication No. 61-24062 discloses that a synthetic resin is extruded into a base material, and a plastic material is formed on the upper surface of the base material. A paste-like synthetic resin compatible with the base material is used as the vehicle,
A molding material containing an organic solvent enough to soften the surface layer of the base material is placed thereon, and a molding die having a concave pattern formed thereon is pressed against the molding material so that an engraving pattern appears, and the vehicle and the base material are separated. A method for joining is disclosed. By using this method, a plastic molded product can be manufactured continuously, and an inexpensive and beautiful product can be obtained.

Further, the present applicant discloses a method for producing a plastic sheet having a convex pattern on one side and printed at a predetermined position on the other side in Japanese Patent Publication No. 63-27070. In this method, an intaglio-molded paste-like synthetic resin is formed on one surface of a light-transmitting base material to form a display body in which characters, symbols, frames, and the like protrude. A plate having a notch is formed. Then, the plate-like material is placed on a printing machine as a receiving stand for screen printing, and a display is fitted and placed on the receiving stand, thereby positioning and screen printing the other surface of the base material. Therefore, the position of the screen printing corresponding to the display body can be easily adjusted.

[0006] The present applicant has also disclosed Japanese Patent Publication No. 3-33500 (Patent No. 1666906) and Japanese Patent Publication No. 4-55851 (Patent No.
No. 1767264) discloses a method of forming a concavo-convex pattern by applying a transparent or opaque paste-like resin to one surface of a transparent base sheet and pressing a plate having an intaglio pattern formed thereon. I have. When the paste-like resin is transparent, a crystal-like pattern on which a precise uneven pattern is formed can be obtained. When the paste-like resin is opaque, a porcelain-like glossy pattern on which a fine uneven pattern is formed can be obtained.

[0007] In addition, Japanese Patent Application Laid-Open No. 7-32474 discloses that an ionizing radiation curable resin is filled in a concave portion of a roll intaglio plate and is irradiated with ionizing radiation in a state where a base sheet is in contact with the resin, whereby ionization having irregularities is achieved. A method for producing a shaped sheet having a radiation-curable resin layer is disclosed.

[0008] The plastic molded articles obtained by the above-mentioned method are all formed by bonding a plastic material having irregularities to the surface of a substrate, and it is necessary to continuously obtain an individual such as an emblem. In addition, it is necessary to cut the base sheet into a predetermined shape.

The present invention has been made in view of the above circumstances, and is intended to fill a concave portion of a cylindrical or roll-shaped plate body with a paste-like resin, solidify and remove the same, and thereby obtain a plastic having an appropriate hardness. It is an object of the present invention to provide a method for continuously producing a molded product.

[0010]

According to the first aspect of the present invention,
A method for producing a plastic molded article having a predetermined shape, wherein a cylindrical or roll plate having a plurality of recesses formed on its surface is rotated around its axis while filling a paste-like resin into the recesses. Then, the filled paste resin is solidified and taken out from the plate.

Since the paste resin is used, the shape corresponding to the concave portion formed on the plate can be strictly reproduced. By appropriately setting the composition of the paste resin, a plastic molded product having a desired hardness can be obtained. Further, since a cylindrical or roll plate is used and rotated around its axis, a plastic molded product can be manufactured continuously.

According to a second aspect of the present invention, in the first aspect, the paste-like resin has thermosetting properties, and after heating the paste-like resin filled in the recess, the paste-like resin is cooled, It is characterized by taking out from

According to a third aspect of the present invention, in the second aspect, the paste resin is mainly composed of polyvinyl chloride and a plasticizer thereof.

In the structure of the second and third aspects, the paste-like resin filled in the concave portion is gelled by heating, and then solidified in a shape corresponding to the concave portion by cooling. By appropriately setting the content of the plasticizer, a plastic molded product having a desired hardness can be obtained. Thereby, the effect of the first aspect is obtained.

According to a fourth aspect of the present invention, in the first aspect, the paste-like resin has photocurability, and the paste-like resin filled in the concave portion is irradiated with light to be solidified, and the plate-like resin is cured. It is characterized by being taken out of the body.

Therefore, the paste-like resin filled in the concave portions is cured in a shape corresponding to the concave portions by being irradiated with light. In this case, the hardness is adjusted by mixing with another synthetic resin. Thereby, the effect of the first aspect is obtained.

According to a fifth aspect of the present invention, in the first to fourth aspects, the recesses of the plate are connected at predetermined intervals by grooves relatively shallower than the recesses. The filling of the paste-like resin into the groove portion is performed simultaneously with the filling.

Thus, a molded product corresponding to a predetermined number of concave portions can be taken out as a series.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a film is pressed to a position where the plastic molded product is taken out of the plate, and the film and the plastic molded product are separated from each other. After the bonding, the film is separated from the plate, whereby the plastic molded product is taken out from the plate.

Therefore, the formed plastic molded product can be easily taken out of the plate without damaging the plastic molded product. Further, since the film and the plastic molded product are only temporarily temporarily bonded, the film can be reused, thereby reducing material costs.

According to a seventh aspect of the present invention, there is provided the method according to any one of the first to fourth aspects, wherein a sharp end portion is formed between the concave portions of the plate for forming a linear body between the plastic molded products. The recess is filled with the paste-like resin, and when the recess is filled with the paste-like resin, the groove is simultaneously filled with the paste-like resin.

[0022] Thus, it is possible to take out the formed plastic molded product in a pot-vine manner. In addition, the continuously formed plastic molded product can be easily divided since the ends are connected by a sharp linear body.

According to an eighth aspect of the present invention, in the seventh aspect, the concave portion of the plate has a predetermined shape with a substantially constant depth, and a pattern is further concavely formed on a bottom surface thereof. .

Thus, on the base portion having a thickness corresponding to the depth of the concave portion of the plate, predetermined patterns such as letters, numbers, symbols, frames, etc., which are indented on the bottom surface of the concave portion, are convex. An integrally formed plastic molding is obtained.

According to a ninth aspect of the present invention, in the method of the seventh or eighth aspect, the linear body is divided by applying a predetermined pressure after removing the linear body from the plate.

By subjecting a continuously formed plastic molded product to a process of hitting, pulling, pressing against an angular object, or the like, in the vicinity of a linear body having a sharp end, It can be easily divided into individual plastic moldings.

According to a tenth aspect of the present invention, in any one of the first to ninth aspects, a metal foil or a pigment foil is transferred to the surface of the convex portion of the object taken out of the plate.

For example, when a metal foil is transferred, a luxurious impression can be given as a whole due to the metallic luster. When the pigment foil is transferred, the appearance of the plastic molded product can be beautifully finished.

According to an eleventh aspect of the present invention, in any one of the first to ninth aspects, the surface of the convex portion of the object taken out of the plate is colored.

Thus, the plastic molded product is colorfully finished, and the design is enhanced.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. Embodiment 1 FIG. FIG. 1 is a schematic view showing the configuration of an apparatus used for carrying out the method for producing a plastic molded product according to the present invention. In the figure, reference numeral 1 denotes a metal cylinder (plate) having a concave portion 11 formed on the surface thereof, and is configured to rotate at a predetermined speed. The concave portion 11 is formed by, for example, engraving a large number of alphabets constituting an English word, and the alphabets constituting the English word are connected by a relatively shallow groove. An application roll 2 is disposed in the vicinity of the lower side of the metal cylinder 1. A resin tank 4 for storing a paste resin 3 is provided below the application roll 2. It is installed so as to be immersed in the resin 3. Above the application roll 2, a doctor knife 5 for scraping the excess of the pasty resin 3 applied by the application roll 2 is attached.

A Schwann burner 6 for heating the inner surface of the metal cylinder 1 at this position is provided inside the metal cylinder 1 and slightly downstream of the doctor knife 5 in the rotation direction of the metal cylinder 1. Further, a cooler 7 for water-cooling the inner surface of the metal cylinder 1 at this position is provided inside the metal cylinder 1 and substantially half-circumferentially downstream of the Schwann burner 6 in the rotation direction of the metal cylinder 1. A press roll 9 for temporarily bonding a non-plastic film 10 is provided on the side of the metal cylinder 1 at a position after the cooler 7. A drawing device 21 for drawing the non-plastic film 10 is provided diagonally above the pressing roll 9, and a drawing device 22 for drawing the non-plastic film 10 is provided beside the pressing roller 9. A feed roll 1 is provided diagonally below the press roll 9.
1, a receiving roll 12 and a peeling roll 13 are arranged substantially horizontally side by side. A coloring roll 14 is provided below the receiving roll 12, and a substantially lower half thereof is immersed in the ink 16 in the ink tank 15.

As the metal cylinder 1, a metal plate, such as an iron plate, a copper plate, a brass plate, or a magnesium plate, formed into a cylindrical shape can be used. Then, a photosensitive agent is applied to the surface, and a positive film such as a dial is closely adhered and baked in the same manner as in baking of a photograph, followed by washing with water. When an etching solution such as an iron chloride solution is sprayed on the cylinder on which the positive film is baked, only the portion having no photosensitive film is etched. As a result, the concave portion 11 in which the predetermined pattern is
Can be formed.

Alternatively, the metal cylinder 1 may be directly engraved with a predetermined pattern so as to be indented. A roll plate may be used instead of the metal cylinder.

A method for producing a plastic molded product using such an apparatus will be described. As the paste-like resin 3, for example, a plasticizer (oil) added to a powder of PVC (polyvinyl chloride) to form a sol is filled in the resin tank 4 in advance. Table 1 shows the composition of the paste resin 3. Further, the predetermined position of the metal cylinder 1 is heated to about 200 ° C. by the Schwann burner 6.

[0036]

[Table 1]

When the metal cylinder 1 is rotated in this state, the paste resin 3 is applied to the surface of the metal cylinder 1 by the application roll 2, and the paste resin 3 applied extra to the surface other than the concave portion 11 and the groove is removed. Doctor knife 5
Is scraped off.

The paste-like resin 3 filled in the recess 11 is
It gels by the heating of the Schwann burner 6, and further moves to the position of the cooler 7 with the rotation of the metal cylinder 1, where it is cooled. The paste-like resin 3 is solidified by cooling into a shape along the recess 11 and the groove, and the metal cylinder 1
It is easy to peel off from At this position, a non-plastic film 10 such as PVC or PET is pressed against the surface of the metal cylinder 1 and temporarily bonded to the solidified paste resin 3. Then, when the non-plastic film 10 is separated from the metal cylinder 1, a plastic molded product 31 as shown in FIG. After the removal, the surface of the plastic molded product 31 is colored by the coloring roll 14 and passes through the peeling roll 13, whereby the colored plastic molded product 31 is removed from the non-plastic film 10.

The plastic molded article 31 thus obtained has a series of alphabets connected by a linear body 31a, and the surface is colored in a predetermined color. Moreover, since it has desired flexibility, even if the surface to be bonded is a curved surface having a small radius of curvature or has a complicated shape, it can be easily attached using an adhesive tape or an adhesive. . Therefore, there is no need to prepare a mold in accordance with the shape of the surface to be adhered or to re-mold a plastic molded product, which increases versatility and leads to a reduction in manufacturing cost.

It is to be noted that plastic molded articles 31 having various hardnesses can be easily produced by the content of the plasticizer in the paste resin 3, and the same metal cylinder 1 is used for any hardness. can do. Therefore, when the surface to be bonded is not flat, it is possible to cope with the problem by increasing the plasticity of the plastic molded product 31, and it is not necessary to change the surface shape of the metal cylinder 1 or use another metal cylinder.

The plastic molded product 31 obtained by blending the reactive plasticizer with the vinyl chloride paste has a high heat dependence of hardness, and has a property of being soft at high temperatures and hard at room temperature. Therefore, for example, applying a hot-melt adhesive to the back surface and heating the entire molded product, when closely adhered to the adhered surface of a complex shape, deforms along the adhered surface, the adhesive solidifies with cooling, Further, the molded product is cured. Thereby, it is possible to easily attach to the adhered surface having a complicated shape without performing special molding on the back surface.

As the paste-like resin 3, besides PVC, a photo-curable synthetic resin, for example, a UV-curable resin (for example, acrylic resin manufactured by Mitsubishi Rayon Co., Ltd.) can be used. In this case, the hardness is adjusted by mixing with another synthetic resin. The paste-like resin filled in the recess is irradiated with light or ultraviolet light to be solidified.

When coloring the surface of the plastic molded product 31, it is desirable to apply a predetermined anchor treatment agent in advance. Further, instead of the structure in which the ink is transferred by a roll, a method such as spraying may be used. Furthermore, by transferring a metal foil such as a gold foil, a silver foil, or a pigment foil, or a metal chrome, by plating, vacuum deposition or foil transfer,
It may be finished in silver. When gloss such as metallic luster or pearl luster is applied, a luxurious impression can be given as a whole.

After coloring, the surface is finished by overcoating using a UV resin, an acrylic resin or a urethane resin. A double-sided tape is stuck on the back side to complete the product.

By mixing the pigment with the paste resin 3, the entire plastic molded product 31 can be easily colored into a desired color. Incomplete kneading of the pigment enables coloring in a marble shape.

By using the rotating metal cylinder 1, such a plastic molded product 31 can be manufactured continuously. Furthermore, the non-plastic film 10 wound by the winding device 22 can be installed in the drawing device 21 and reused, leading to cost reduction.

Embodiment 2 In the present embodiment, the concave portion 11 of the metal cylinder 1 has a rectangular shape with a predetermined depth, and an alphabet, for example, is further indented on the bottom surface. Other configurations are the same as those of the first embodiment, and illustration and description are omitted.

In the plastic molded article 31 taken out of such a metal cylinder 1, the base portion 31b has the thickness of the concave portion 11, and the surface of the base portion 31b has 31c is formed convexly and integrally (FIG. 3). When the surface is colored with a color different from that of the paste-like resin 3, the color becomes different from that of the base portion 31b serving as the back.
Are clearly and colorfully distinguished, and the design is enhanced. Further, by processing the inner wall surface of the concave portion 11, fine irregularities such as woodgrain can be easily formed on the surface of the base portion 31b.

Embodiment 3 FIG. 4 is a schematic diagram showing an apparatus for performing the method of manufacturing a plastic molded product according to the third embodiment. In the present embodiment, a metal cylinder 1 having a groove with a sharp end formed on the surface for connecting the concave portions 11 to each other is used. Also non-plastic film
A means for bonding and peeling 10 (pressing roll 9 and peeling roll 13) is not provided, and a peeling roll 23 is provided at the position of pressing roll 9. Other configurations are the same as those of the first embodiment, and illustration and description are omitted.

In the plastic molded article 31 taken out of such a metal cylinder 1, the base portion 31b has the thickness of the concave portion 11, and the surface of the base portion 31b has 31c is formed convexly and integrally. Further, the end portions of the base portions 31b are connected by a sharp linear body 31d (FIG. 5). The number of the linear bodies 31d between the solids may be one, but when a plurality of the linear bodies 31d are formed, they may be connected in the crossing direction as shown in FIG. In addition, the configuration of connecting synthetic resin products with tearing linear bodies is disclosed by the present applicant in Japanese Utility Model Publication No. 61-16111.
No. has been disclosed.

Therefore, the plastic molded article 31 in the present embodiment can be taken out in a potato vine type via the peeling roll 23. Then, the plastic molded product 31 taken out of the metal cylinder 1 is colored on its surface by a coloring roll 14 as required, and then pressed against an angular object (for example, 24 in the figure) near the linear body 31d. Alternatively, by applying a method such as applying a blow, the point joint portion between the linear body 31d and the base portion 31b is cut, and the plastic molded articles 31 are individually obtained.

Incidentally, a concave portion which can be obtained in a state where a series of alphabet portions 31c are directly connected by a linear body 31d.
11 and the groove are formed in the metal cylinder 1 and the linear body 31 is formed.
It may be configured to remove d. In this case, the cutting force of the linear body 31a in the alphabet portion 31c needs to be greater than the cutting force of the linear body 31d between the alphabet portions 31c.

[0053]

As described above, in the method of manufacturing a plastic molded product according to the present invention, the paste-like resin is filled in the recesses of the plate and solidified, so that the resin can be precisely formed along the shape of the bottom of the recess. The convex portion is easily formed. In addition, using a cylindrical or roll-shaped plate, by rotating this around its axis, it is possible to mass-produce continuously, etc.
The present invention has excellent effects.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of an apparatus used to carry out a method of manufacturing a plastic molded product according to a first embodiment.

FIG. 2 is a perspective view showing a plastic molded product obtained in the first embodiment.

FIG. 3 is a perspective view showing a plastic molded product obtained in Embodiment 2.

FIG. 4 is a schematic diagram showing a configuration of an apparatus used to carry out a method of manufacturing a plastic molded product according to a third embodiment.

FIG. 5 is a schematic perspective view showing a plastic molded product taken out of a metal cylinder in a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal cylinder 2 Application roll 3 Paste resin 6 Schwann burner 7 Cooler 9 Press roll 10 Non-plastic film 14 Coloring roll 23 Peeling roll 31 Plastic molding 31a, 31d Linear body 31b Base part 31c Alphabet part

Claims (11)

[Claims] 1. A method for producing a plastic molded product having a predetermined shape, wherein a cylindrical or roll plate having a plurality of recesses formed on a surface thereof is rotated around its axis while a paste is applied to the recesses. A method for producing a plastic molded article, comprising filling a paste resin, solidifying the filled paste resin, and taking out the paste resin from the plate. 2. The paste-like resin according to claim 1, wherein the paste-like resin has thermoplasticity, and after the paste-like resin filled in the concave portion is heated, the paste-like resin is cooled and taken out from the plate. Manufacturing method of plastic molded products. 3. The method according to claim 2, wherein the paste-like resin contains polyvinyl chloride and a plasticizer thereof as main components. 4. The paste-like resin has photo-curability, and the paste-like resin filled in the recess is irradiated with light to be solidified and taken out of the plate. A method for producing the plastic molded product as described above. 5. The recesses of the plate are connected at predetermined intervals by grooves that are relatively shallower than the recesses. When filling the recesses with the paste-like resin, the recesses are simultaneously formed in the recesses. 5. A paste-like resin is filled.
The method for producing a plastic molded article according to any one of the above. 6. Pressing a film to the position of taking out the plastic molded product of the plate, bonding the film and the plastic molded product, and then separating the film from the plate, 6. A plastic molded product is taken out of the plate.
The method for producing a plastic molded article according to any one of the above. 7. The recess between the plate bodies is connected by a relatively shallow groove having a sharp end to form a linear body between the plastic molded products, and the recess is filled with a paste-like resin. The method for producing a plastic molded product according to any one of claims 1 to 4, wherein, at the same time, the paste is filled in the grooves at the same time. 8. The method for manufacturing a plastic molded product according to claim 7, wherein the concave portion of the plate has a predetermined shape with a substantially constant depth, and a pattern is further concavely formed on a bottom surface thereof. . 9. The method for producing a plastic molded product according to claim 7, wherein the linear body is divided by applying a predetermined pressure after being taken out from the plate body. 10. The method for producing a plastic molded product according to claim 1, wherein a metal foil or a pigment foil is transferred to a surface of the plastic molded body after being taken out from the plate. 11. The method for producing a plastic molded product according to claim 1, wherein the surface is colored after being taken out of the plate.