JP3299007B2 - Method of manufacturing rubber double color elastic pavement material - Google Patents

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 rubber double-colored elastic pavement having a surface of two or more colors.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a rubber elastic pavement material in which rubber chips obtained by pulverizing old tires, waste rubber materials and the like are solidified in a plate shape with an adhesive such as urethane. This rubber elastic pavement material is suitable as an elastic pavement material because a small gap formed between the rubber chips forms a communication path and the communication path ensures water permeability. Moreover, it is also useful in that industrial waste can be reused. However, since rubber waste such as old tires is usually made of black, an elastic pavement formed by using the rubber chip made of the rubber waste as it is becomes monotonous in black and has poor decorativeness. Therefore, recently, rubber two-color elastic pavement materials as shown in FIGS. 5 and 6 have been proposed. Note that 5 in FIG.
The portions indicated by 0 and 51 have different colors from each other.

[0003] As a conventional method of manufacturing the rubber two-color elastic pavement material, as shown in FIGS. 7 and 8, a rubber chip elastic plate 52 formed in a predetermined shape in advance is placed on an inner surface of a mold 53. Thereafter, a die material 53 in which rubber chips having different colors from the elastic plate 52 are mixed with a urethane-based adhesive is filled in a mold 53, and the die material 53 is closed and hot pressed to bond the chip material. There is a method in which the agent is cured to harden the rubber chip into the shape of the inner surface of the mold, and is integrally connected to the elastic plate 52.

As shown in FIG. 9, an elastic plate 55 and an elastic substrate 56 having different colors are separately formed from rubber chips, and the elastic plate 55 is fitted into a concave portion 57 provided on the surface of the elastic substrate 56. There is also a method of bonding.

However, in the former manufacturing method, it is difficult to correctly arrange the elastic plate 52 in the mold, and even if it is correctly arranged, the elastic plate 52 tends to be displaced during subsequent filling of the chip material and hot pressing. There is a problem that the quality (decorativeness) of the obtained two-color elastic pavement material is not constant. Moreover,
There is an annoyance that the elastic plate 52 must be separately formed in advance.

On the other hand, in the latter manufacturing method, the gap 58 between the outer peripheral surface of the elastic plate 55 and the inner peripheral surface of the concave portion 57 is not constant, and the quality is not constant. There is a problem that the appearance is impaired. In addition, there is a trouble that both the elastic plate 55 and the elastic substrate 56 must be separately formed in advance. In addition, there is a method to make two colors by post-painting, but in this case, not only the painting work is troublesome, but also the problem that the communication path formed between the rubber chips is blocked by the paint film and the water permeability is impaired. There is also.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned points, and provides a method for easily producing a multicolored elastic pavement material having a constant quality and excellent decorativeness and water permeability. Is what you do.

[0008]

That is, according to the present invention, a first raw material obtained by mixing a rubber chip of a desired color and an adhesive is put into a mold, and the inside of the mold is formed by a pressing die having a projection on the inner surface. A substrate forming step of forming a rubber substrate having a concave portion formed on its surface by hot pressing the first raw material to cure the adhesive, and a rubber chip of the first raw material in the concave portion of the rubber substrate. A second raw material obtained by mixing rubber chips of different colors and an adhesive is charged, and the surface of the rubber substrate other than the concave portion is charged.
To cover the surface and surround the periphery of the recess in a wall shape.
In the state where the tool is arranged, it has a projection facing the recess
Using a pressing die, the jig is provided between the pressing die and the rubber substrate.
Decorative body forming the decorative body integrally with the rubber substrate by hot pressing the second raw material in the rubber substrate concave portion with the pressing die and curing the adhesive of the second raw material with the pressing mold The present invention relates to a method for producing a rubber double-color elastic pavement material, comprising: a step of removing a molded product obtained by integrating the rubber substrate and the decorative body from the mold.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a mold showing an example of a substrate forming process in an embodiment of the present invention. FIG. 2 is a cross-sectional view of a mold showing a state where a second raw material is charged into a substrate recess in the embodiment.
FIG. 3 is a cross-sectional view of a mold showing an example of a decorative body forming step, and FIG. 4 is a cross-sectional view of a rubber double-colored elastic pavement obtained by the same embodiment.

[0010] The method for producing a rubber double-colored elastic pavement material of the present invention comprises a substrate forming step, a decorative body forming step, and a mold releasing step. FIG. 1 shows an example of a mold for implementing the manufacturing method of the present invention. Reference numeral 10 denotes a mold, which comprises a lower mold 12, a middle mold 14, and a press mold 16 for easy separation of the molded product, and the inside of the mold is a molding space for defining the shape of the elastic pavement material. .

The pressing die 16 has a projection 18 on its inner surface. The protrusions 18 are provided for providing concave portions for forming decorative bodies of different colors on the rubber substrate of the elastic pavement material, and a plurality of protrusions 18 may be provided on the inner surface of the pressing die 16. The entire outer periphery of the inner surface may have a protruding shape so that the outer periphery of the inner surface has a different color.

In this embodiment, the molding space of the mold 10 is formed to be 150 × 200 × 15 mm. The protrusion 18 has a size of 100 × 150 and a height of 5 mm at a substantially central portion of the inner surface of the pressing die 16.

Next, a substrate forming step in the manufacturing method of the present invention using the mold 10 will be described. First, as shown in FIG.
The first raw material 23 obtained by mixing the first raw material 23 with the adhesive
0 is put into the molding space. It is preferable that the filling of the first raw material 23 into the mold is overfilled so that the rubber chips are compressed during hot pressing.

Then, the first raw material 23 is hot-pressed by the pressing die 16. The adhesive in the first raw material 23 is hardened by the hot pressing, and the rubber chip 21 is solidified into the inner shape of the mold 10 to form the rubber substrate 25. On the surface of the rubber substrate 25, the concave portion 24
Are formed. The condition of the hot press depends on the type and amount of the rubber chip and the adhesive to be used.
About 3 minutes at 0 ° C. is preferable. The rubber chip 21 used for molding the rubber substrate 25 is preferably a pulverized product such as a used tire or a waste rubber material described above. A black or colored material is used as it is or is colored as necessary.
The rubber chip 21 may include chips other than rubber, such as urethane sponge chips and wood chips. As the adhesive, a known adhesive such as a urethane-based adhesive used for bonding a rubber chip is used.

Next, a decorative body is formed on the rubber substrate 25 in a decorative body forming step. As shown in FIG. 2, the rubber substrate 25 obtained by the substrate molding process is used.
The second raw material 26 constituting the decorative body is put into the concave portion 24 of FIG. Like the first raw material 23, the second raw material 26 is preferably overfilled so that the rubber chips are compressed during hot pressing.

The second raw material 26 is obtained by mixing a rubber chip 27 having a color different from that of the rubber chip 21 used for the first raw material 23 with an appropriate adhesive. To form a decorative body. The rubber chip 27 has a desired color different from the color of the rubber substrate 25. However, when the color of the rubber substrate 25 is other than black, it may be left black without coloring. is there.

At this time, a jig 29 is arranged on a portion other than the concave portion 24 on the surface of the rubber substrate 25. This jig 29 covers the surface of the rubber substrate and surrounds at least the periphery of the concave portion 24 in a wall shape higher than the upper surface of the rubber substrate 25 to keep the surface of the rubber substrate 25 smooth and This is for preventing the second raw material 26 overfilled from reaching the other portion of the rubber substrate 25 and is formed to have a thickness substantially equal to the height of the protrusion 18.

Subsequently, as shown in FIG. 3, the pressing die 16 is pressed in the direction of the lower die 12 via the jig 29, and the pressing portion 16 is opposed to the concave portion 24 by the projecting portion 18.
The second raw material 26 is hot-pressed. The adhesive in the second raw material 26 is hardened by the heat at the time of pressing, and the decorative body is integrally formed on the surface of the rubber substrate 25. In FIG. 3, reference numeral 13 denotes a spacer. This spacer 13
Is for preventing the protrusion 29 from pressing the second raw material 26 excessively, and has a thickness of the same size as the depth of the recess 24 (the protrusion height of the protrusion 18). In this embodiment, the pressing condition for forming the decorative body is 160 ° C. for 5 minutes.

Thereafter, when the pressing die 16 is opened, the middle die 14 is separated from the lower die 12, and the molded product is released from the die 10, the multicolor elastic pavement material 30 shown in FIG. 4 is obtained. Reference numeral 31 denotes a decorative body

[0020]

As shown and described above, according to the method of the present invention, a rubber double color with excellent decorativeness, having a constant quality of a decorative portion and a constant quality without color mixing at its boundary. An elastic pavement material can be easily obtained.
Moreover, the obtained rubber double-colored elastic pavement material is most suitable as a pavement material because water permeability is ensured by the communication path formed by the gap between the rubber chips. Further, the production method of the present invention does not require separate molding of the rubber substrate and the decorative body in advance, and can be continuously molded.

[Brief description of the drawings]

FIG. 1 is a sectional view of a mold showing an example of a substrate forming step in an embodiment of the present invention.

FIG. 2 is a sectional view of a mold showing a state in which a second raw material is charged into a concave portion of a substrate in the embodiment.

FIG. 3 is a sectional view of a mold showing an example of a decorative body forming step.

FIG. 4 is a cross-sectional view of a rubber double-colored elastic pavement obtained according to the example.

FIG. 5 is a sectional view of a general rubber two-color elastic pavement material.

FIG. 6 is a sectional view showing another example.

FIG. 7 is a cross-sectional view illustrating a conventional manufacturing method when an elastic plate is arranged.

FIG. 8 is a cross-sectional view showing a state in which a chip material is filled in a conventional manufacturing method.

FIG. 9 is a cross-sectional view showing an example of a rubber two-color elastic pavement material manufactured by another conventional method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 Mold 12 Lower mold 14 Middle mold 16 Press mold 18 Protrusion 21 Rubber chip 23 First raw material 24 Concave 25 Rubber substrate 26 Second raw material 27 Rubber chip 30 Multicolored elastic pavement material 31 Decoration

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 39/02-39/12 B29C 43/02-43/20 B29C 43/36 E01C 5/18-5/22

Claims (1)

(57) [Claims] 1. A first raw material obtained by mixing a rubber chip of a desired color and an adhesive is put into a mold, and the first raw material in the mold is hot-pressed by a pressing die having a projection on an inner surface. By curing the adhesive, a substrate forming step of forming a rubber substrate having a concave portion formed on the surface thereof, and a rubber chip and an adhesive having a color different from that of the first raw material rubber chip in the concave portion of the rubber substrate. The mixed second raw material is charged, and the surface of the rubber substrate other than the concave portion is covered with the surface.
State in which a jig surrounding the recess in a wall shape is arranged
In this, using a pressing die having a projection facing the recess,
The jig is interposed between the pressing die and the rubber substrate to
A decorative body forming step of forming a decorative body integrally with the rubber substrate by hot-pressing the second raw material in the rubber substrate concave portion with a pressing die to cure the adhesive of the second raw material; A method for producing a rubber double-colored elastic pavement, comprising: a removing step of taking out a molded article in which a substrate and a decorative body are integrated from the mold.