JPH0588648B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for producing an artificial stone frame plate used in the production of photographic artificial stone ornaments.

BACKGROUND OF THE INVENTION The present inventor has proposed a structure that has a substantially truncated pyramid shape, has a flat bottom wall surface, a central top wall surface forming a photographic paper placement surface, and an edge frame portion surrounding the central top wall surface. An artificial stone frame board is prepared in advance, and the center top wall surface is in a position sunken below the top surface of the edge frame part, and both the front and back sides of the photographic printing paper are coated with resin in the form of a sandwich. A resin coating of photographic paper is placed on the photographic paper mounting surface of the artificial stone frame, and is integrally fixed to the artificial stone frame by the stone powder-containing resin layer, thereby forming an artificial stone with a photograph on it. A method of manufacturing ornaments was proposed.

Conventionally, the artificial stone frame board used in the above method has a dish shape with a square opening at the top surface, a rectangular bottom wall, and a sloped peripheral side wall, and the bottom wall and the peripheral side wall are formed of the artificial stone. A mold made of reinforced plastic having a predetermined shape for forming the central top wall surface and edge frame of the stone frame board is prepared, and after filling the mold with a resin stone powder mixture, the bottom of the flat artificial stone frame board is prepared. In order to form a wall surface, the top opening of the mold is sealed with a lid plate having a flat lower back surface, and the lower back surface of the lid plate is brought into contact with the top edge of the peripheral side wall of the mold and pressurized. , by simultaneously heating and curing the filled resin stone powder mixture layer.

Problems to be Solved by the Invention According to this production method, air bubbles mixed into the resin stone powder mixture layer during filling into the mold form uncured or semi-cured resin in the process of curing the resin stone powder mixture layer. The air bubbles move upward through the stone powder mixture toward the upper surface thereof, and curing is completed when the air bubbles are gathered at the portion that forms the bottom wall surface of the artificial stone frame plate.

As a result, after the mold is released, the bottom wall surface of the finished artificial stone frame board is not smooth due to the formation of unevenness due to the bubbles, and the concentration of air bubbles on the bottom wall surface results in an unfavorable appearance. It wasn't something.

Therefore, an object of the present invention is to easily obtain an artificial stone frame board with air bubbles contained therein, a smooth surface, and a neat appearance suitable for manufacturing artificial stone ornaments with photographs. An object of the present invention is to provide a method of manufacturing an artificial stone frame board that enables the following.

Means for Solving the Problems In order to achieve the above object, the present invention is characterized by the combination of the following steps: a flat bottom wall surface, a central top wall surface forming a decorative display material mounting surface, and a central top wall surface forming a decorative display material mounting surface; The present invention provides a method for manufacturing an artificial stone frame board, which includes an edge frame portion surrounding a central top wall surface, the center top wall surface being at a position sunken below the top surface of the edge frame portion.

(a) the top surface is open and has a bottom wall and a peripheral side wall, the bottom wall is located at a position higher than the peripheral edge forming the lowest wall surface and the lowest wall surface of the peripheral edge, and is higher than the top opening; has a central inner bottom wall forming portion located at a low position, and the peripheral side wall is for forming an artificial stone frame plate extending substantially vertically from the peripheral edge of the peripheral edge of the bottom wall to the top opening. preparing a mold; (b) filling the mold with a primary resin stone powder mixture to a predetermined depth that does not reach the top opening of the mold; is cured from the bottom, and the upper part is kept in an uncured or semi-cured state, while air bubbles present in the first resin stone powder mixture layer are moved upward toward the upper surface of the first resin stone powder mixture layer. (c) filling a second resin stone powder mixture onto the first resin stone powder mixture layer in the mold so that it rises to a level exceeding the top opening of the mold; The top opening of the mold is sealed with a lid plate having a flat lower back surface, and the lower back surface of the lid plate is brought into contact with the top edge of the peripheral side wall of the mold to press the mold and forming a lid plate assembly; (e) before the secondary resin powder mixture is completely cured, inverting the mold and lid plate assembly and filling the layer of the secondary resin powder mixture; (f) moving the air bubbles present in the mold upward toward the vicinity of the interface between the first resin stone powder mixture layer and the second resin stone powder mixture layer; When pressurizing the three-dimensional body, the top edge of the peripheral side wall of the mold is uniformly pressed against the lid plate, and at the same time, the assembly of the mold and lid plate is heated to a combination of steps consisting of curing a secondary resinous powder mixture; and (g) demolding said cured primary and secondary resinous powder mixtures from said mold and lid plate.

Effects According to the present invention, since the above-mentioned steps are combined, air bubbles mixed in each layer of the resin stone powder mixture are removed at the time of each filling of the primary and secondary resin stone powder mixtures into the mold. At the time of curing, curing is completed in a state where the resin is confined near the interface between the first resin stone powder mixture layer and the second resin stone powder mixture layer, and an artificial stone frame board is formed. As a result, it is possible to manufacture an artificial stone frame board having a smooth surface without any unevenness caused by air bubbles being formed on the surface.

Example FIG. 7 shows an artificial stone frame board obtained by the method for manufacturing an artificial stone frame board according to the present invention. The artificial stone frame board 20 is substantially in the shape of a truncated quadrangular pyramid, and has a flat bottom wall surface, a central top wall surface 21 forming a photographic paper mounting surface, and an edge frame portion surrounding the central top wall surface 21. 22. The edge frame portion 22 consists of a flat top surface 23 and a slope 24, and the central top wall surface 21 is connected to the top surface 23 of the edge frame portion 22.
It has a protrusion 25 on the periphery and a flat photographic paper mounting surface 26 on the inside thereof, and the top surface of the peripheral protrusion 25 is lower than the photographic paper mounting surface 26. It is high and located at a position lower than the top surface 23 of the edge frame portion 22.

The method of manufacturing the artificial stone frame plate 20 according to the present invention is as described below.

First, a mold for forming the artificial stone frame plate 20 is prepared by molding reinforced plastic (FRP). FIG. 1 is a longitudinal cross-sectional view of the mold 1. The mold 1 has a rectangular opening at the top surface, and has a dish shape having a rectangular bottom wall 1b and a sloped circumferential wall 1a surrounding the bottom wall 1b. have,
The bottom wall 1b has a peripheral edge 2 forming a flat lowest wall surface.
and a rectangular central inner bottom wall surface forming portion 3 located at a position higher than the lowest wall surface of the peripheral edge portion 2 but lower than the top opening. The central inner bottom wall surface forming portion 3 further includes a groove portion 3a surrounding the periphery.
and a flat photographic paper placement surface forming portion 3 formed at a position higher than the bottom surface of the groove portion 3a inside thereof.
It has b. Further, the circumferential wall 1a has a flange 1c on the outer periphery of the top end.

Next, a release agent is applied to the inner surface of the mold 1, and an appropriate amount of resin 4 for forming a pattern is filled into the peripheral edge 2 of the mold 1. This process is shown in FIG.

The mold 1 is filled with the primary resin stone powder mixture 5 to a height of about 8/10 of the depth of the mold. This resin stone powder mixture 5 consists of marble stone powder, calcium carbonate powder, and an unsaturated polyester resin containing a hardening accelerator and a hardening agent. Then, the filled first resin stone powder mixture layer 5 is cured from the bottom, and the upper part is kept in an uncured or semi-cured state, and at this time, air bubbles existing in the first resin stone powder mixture layer are removed. The mixture is moved upward toward the upper surface of the primary resin stone powder mixture layer 5. At this point, the primary resin stone powder mixture layer 5 is about 60%
hardened to. This process is shown in FIG.

Thereafter, a second resin stone powder mixture 7 is applied onto the first resin stone powder mixture layer 5 in the mold 1 to a height of about 1/10 of the depth of the mold 1. Fill so that it rises beyond the top opening. The secondary resin stone powder mixture 7 is
It is of the same quality as the primary resin stone powder mixture 5. This process is shown in FIG.

As shown in FIG. 5, the dish has an open top surface, a rectangular bottom wall 8a having a larger area than the top opening of the mold 1, and a peripheral side wall 8b, and has a flat inner bottom surface 8c. After preparing a shaped reinforced plastic lid plate 8 and applying a mold release agent to the inner bottom surface 8c of the lid plate 8, a mold 1 filled with the primary and secondary resin stone powder mixtures 5 and 7 is prepared. The top opening of
The lid plate 8 is used to seal the inner bottom surface 8c of the lid plate 8, and the top edge 1c of the peripheral side wall 1b of the mold 1 is sealed.
The assembly of the mold 1 and the cover plate 8 is formed by contact processing.

As shown in FIG. 6, the secondary resin stone powder mixture 7
Before the mold is completely cured, the assembly of the mold 1 and the lid plate 8 is turned upside down. At this time, the air bubbles 6' existing in the second resin stone powder mixture layer 7 are
The resin tends to rise toward the next resin stone powder mixture layer 5. However, since most of the primary resin stone powder mixture layer 5 has already hardened from the top to the bottom (in FIG. 6), the air bubbles 6' are as shown in FIG. , the first resin stone powder mixture layer 5 and the second resin stone powder mixture layer 7 together with the air bubbles 6 present in the first resin stone powder mixture layer 5.
remains near the interface with

In this way, the air bubbles 6' present in the 7 layers of the secondary resin stone powder mixture were moved upward toward the vicinity of the interface between the 1st resin stone powder mixture layer 5 and the 2nd resin stone powder mixture layer 7. After that, the assembly of the mold 1 and the cover plate 8 which is in an inverted state is placed under pressure, and the top edge 1c of the peripheral side wall 1a of the mold 1 is uniformly pressed against the inner bottom surface 8c of the cover plate 8. The assembly of the lid plate 8 is heated appropriately to harden the primary and secondary resin stone powder mixture layers 5 and 7 filled in the mold 1. Also, during this period, a portion 9 of the unhardened secondary resin stone powder mixture 7 protrudes outward from the periphery of the mold 1 and hardens.

Thereafter, the hardened primary and secondary resin stone powder mixture layers 5 and 7 are released from the mold 1 and the lid plate 8, and unnecessary portions including the protruding portion 9 are removed. Note that this removal work can be easily performed.

In this way, the air bubbles are sealed inside, and an artificial stone frame board with a smooth surface and a neat appearance is formed.

Effects of the Invention As described above, according to the present invention, a resin stone powder mixture is filled into a mold for forming an artificial stone frame board formed into a predetermined shape in two parts at a fixed time interval, and After filling the secondary resin stone powder mixture, before the secondary resin stone powder mixture is completely cured, apply a lid plate to the mold to form an assembly of the mold and lid plate, and invert the assembly. Since the resin stone powder mixture layer was cured, the resin stone powder mixture layer was cured in a state where the air bubbles present in the filled resin stone powder mixture layer were confined near the interface between the first and second resin stone powder mixture layers. An artificial stone frame board is formed. Therefore, it is possible to easily provide an artificial stone frame board that has a smooth surface without the formation of irregularities due to air bubbles, and has a neat appearance and is suitable for manufacturing artificial stone ornaments with photographs.

[Brief explanation of the drawing]

1 to 6 are cross-sectional views of the artificial stone frame board according to the present invention in different manufacturing processes, and FIG. FIG. DESCRIPTION OF SYMBOLS 1... Mold, 2... Periphery, 3... Center top wall surface, 5... Primary resin stone powder mixture, 6, 6'
...Air bubbles, 7...Second resin stone powder mixture, 8...
Lid plate, 20...Artificial stone frame plate, 21...Central top wall surface, 22...Edge frame portion, 26...Photographic paper mounting surface.

Claims (1)

[Scope of Claims] 1. A flat bottom wall surface, a central top wall surface forming a decorative display material placement surface, and a frame portion surrounding the central top wall surface, characterized by the combination of the following steps: A method for producing an artificial stone frame board, wherein the central top wall surface is sunken below the top surface of the edge frame part; The wall has a peripheral edge portion forming the lowest wall surface, and a central inner bottom wall surface forming portion located at a higher position than the lowest wall surface of the peripheral edge portion and lower than the top opening, and the peripheral side wall is providing a mold for forming an artificial stone frame plate extending substantially vertically from the peripheral edge of the bottom wall to the top opening; (b) applying a primary resin stone powder mixture to the mold; After filling the mold to a predetermined depth that does not reach the top opening, the filled primary resin stone powder mixture layer is cured from the bottom, and the upper part is kept in an uncured or semi-cured state. (c) moving air bubbles present in the first resin stone powder mixture layer upward toward the upper surface of the first resin stone powder mixture layer; (c) placing a first resin stone powder mixture layer on top of the first resin stone powder mixture layer in the mold; (d) filling the mold with a secondary resin stone powder mixture to a level exceeding the top opening of the mold; (d) sealing the top opening of the mold with a lid plate having a flat lower back surface; (e) forming an assembly of the mold and the lid plate by contacting and pressurizing the lower back surface of the lid plate with the top edge of the peripheral side wall of the mold; Before curing, the mold and cover plate assembly is inverted, and air bubbles present in the second resin stone powder mixture layer are removed from the first resin stone powder mixture layer and the second resin stone powder mixture layer. (f) Place the inverted mold and lid plate assembly under pressure so that the top edge of the mold peripheral side wall is evenly attached to the lid plate; (g) heating the mold and cover plate assembly to cure the primary and secondary resin stone powder mixtures; Combination of steps consisting of demolding the resin stone powder mixture from said mold and lid plate.