JPH01320198A - Production of transparent synthetic resin molded object - Google Patents

Abstract

PURPOSE:To make an embedded material and a pattern seen as if they were levitating to provide a natural feeling and a deep feeling to the embedded material by a method wherein a molded object is made to have ground glass-like surfaces except the surfaces through which the embedded material inside is to be seen from outside. CONSTITUTION:An acrylic resin becoming colorless and transparent in a set state is melted to be casted into a molding tool 1. On the upper surface of a melting resin layer 2, a pattern plate 3 to be embedded inside is loaded in a levitating state. On the resin layer 2 and the pattern plate 3, a similar melting acrylic resin is gradually casted, whereby the pattern plate 3 is held along the interface of a resin layer 4 which has been supplied thereon. Furthermore, on the resin layer 4, a melting acrylic resin 5 for forming a pattern is mixed. After the pattern is formed by the resin 5, a melting acrylic resin is further gradually casted thereon to form a resin layer 6. Succeedingly, the molding tool 1 is cooled, the opaque white parts of the upper surface which has been directly in contact with air and respective surfaces which have been in contact with the molding tool 1 are scraped, and the peripheral surfaces are further subjected to specular finishing. Lastly, four surfaces other than the front and bottom surfaces are provided with fine irregularities to be made in a ground glass form, and the molded object is completed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing transparent synthetic resin molded articles, and more specifically, the present invention relates to a method for producing transparent synthetic resin molded articles, and more specifically, a method for producing a transparent synthetic resin molded article using a synthetic resin that becomes transparent at least when solidified, such as acrylic resin. This invention relates to a method for manufacturing molded products such as ornaments, specimens, accessories such as pendants, and containers for storage and display, in which various buried bodies are buried. Depending on the intended use of the molded product, examples of buried objects include pattern boards with patterns made of letters, figures, symbols, etc., photographs, films, printed matter, plant flowers and leaves, living creatures such as butterflies, watches, etc. Examples include machines and their parts, as well as containers such as bottles and cans.

[Conventional technology]

Acrylic resin (methacrylic resin) has the characteristics of being extremely transparent among various conventionally known synthetic resins, having excellent weather resistance and gloss, and being easy to process. Therefore, in recent years, by taking advantage of these special improvements, ornaments, specimens, accessories, storage and display containers, etc., which are made by burying various objects inside acrylic resin molded products, have been manufactured.

These conventional acrylic resin molded products are manufactured by various methods, and the -FIQ method is as follows. That is, first, acrylic resin that has been heated to a molten state is poured into the mold to about half the capacity of the mold, and after placing the implant to be buried inside the mold, the mold is further filled to the brim. The method involves pouring acrylic resin until it becomes solid, then cooling and solidifying it. After that, it is removed from the mold, the milky white part on the surface of the solidified acrylic resin is removed, and the surface is mirror-finished to increase transparency and give it a glossy appearance. The figurines, specimens, and
Molded products such as accessories, storage and display containers, etc., have transparent acrylic resin parts that accommodate buried bodies, so
It has an excellent effect in that the buried body inside can be clearly seen from the surroundings and appears to float from the surroundings, and also has good storage stability and can withstand long-term storage.

[Problem to be solved by the invention]

However, in conventional transparent synthetic resin molded products of this type, the acrylic resin portion that accommodates the implanted body is transparent, so conversely, it has not been possible to express a three-dimensional effect or the illusion of depth.

Therefore, this invention provides a transparent body that allows the buried body buried therein to be clearly seen from the outside through the transparent main body part, and that can give the buried body a three-dimensional effect or a sense of depth when viewed. The purpose is to provide a method for manufacturing synthetic resin molded products.

[Means to solve the problem]

In order to achieve the above object, the present invention takes the following technical measures.

That is, first of all, there is a method for manufacturing a transparent synthetic resin molded product using a synthetic resin that becomes transparent at least in a solidified state as a material for forming the main body, in which the synthetic resin for forming the main body is placed in a molten state in a mold. a step of supplying the molded article and burying the body therein, and a step of solidifying the synthetic resin for forming the main body in which the body is buried, and then taking it out of the mold and finishing the surface of the molded article with a mirror finish. This method is characterized by comprising the step of forming the surface of the molded article in a state similar to the surface of frosted glass, except for at least the surface where the internal implant is viewed from the outside.

The second technical means is a method for manufacturing a transparent synthetic resin molded product using a synthetic resin that becomes transparent at least in an assimilated state as a material for forming the main body, and the synthetic resin for forming the main body is placed in a mold. A step of supplying the resin in a molten state and burying the implant therein, and after solidifying the synthetic resin for forming the main body in which the implant is embedded, it is removed from the mold and the surface of the molded product is removed from the outside to the inside. This method is characterized by the step of mirror-finishing only the surface on which the buried body can be viewed.

In each of the above methods, a step of forming a pattern inside the synthetic resin for forming the main body can be provided by adding a molten synthetic resin for forming the pattern.

The addition of the molten synthetic resin for forming the pattern can be done before or after the process of embedding the embedding body in the synthetic resin for forming the main body, which is supplied in a molten state into the mold. .

[Effect]

Since the surface of the molded article is formed to resemble a frosted glass surface, at least except for the surface from which the internal implant is viewed from the outside, the frosted surface becomes translucent and thus has a mirror finish. Part of the light that enters the molded product from the original surface is reflected by the translucent surface. For this reason,
When looking inside the molded product from the mirror-finished surface, the buried body and pattern appear to be raised, and the positional relationship between the front and back of the buried body and the pattern formed by the synthetic resin can also be clearly recognized. can.

〔Example〕

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

Since the detailed structure of the manufacturing apparatus for synthetic resin molded products is already known, a detailed explanation of the manufacturing apparatus will be omitted here, and the description will be limited to the mold part.

FIG. 1 shows an example of a mold used in carrying out the method of the present invention. Since molding is performed here by the so-called "casting method", the upper surface of this mold (1) is open. Further, the mold (1) has a rectangular shape when viewed from above, and therefore, when molded using this mold (1), a rectangular plate-shaped molded product is manufactured.

First, in the first step, an acrylic resin that becomes colorless and transparent when solidified is melted and poured into a mold (1). Since acrylic resin is thermoplastic, it can be easily molten by heating.

This acrylic resin is a resin for forming the main body of the molded product, and the amount of inflow at this time varies depending on the type of buried object to be buried therein and the position where it is buried, as shown in Fig. 1 (a). As such, it is usually a little less than half the volume of the mold (1). The synthetic resin for forming the main body is not limited to acrylic resin, and of course other synthetic resins can be used as long as they satisfy the condition that they become colorless and transparent in a solidified state.

Next, on the upper surface of the molten acrylic resin layer (2) placed in the mold (1), an embedding body to be buried inside, that is, a pattern plate (3) in this case, is placed, and the molten acrylic resin layer (2) is placed.
Make sure the pattern board (3) is floating above. At this time, the acrylic resin layer (2) is formed by heating the mold (1), etc.
It is necessary to prevent it from solidifying. In this embodiment, the pattern board (3) is a thin metal plate cut along the outline of a diagram depicting a dragon sitting on a rock, as shown in FIG. However, the immersion object is not limited to this, and of course, any object including the various objects exemplified above can be immersed depending on the type of molded product.

Next, the same molten acrylic resin as the above acrylic resin was gradually poured onto the acrylic resin layer (2) and pattern board (3) so that the horizontal board (3) would not move.
As shown in b), the pattern board (3) is embedded in the acrylic resin. acrylic resin ■ is at least pattern board (3
) is necessary to make it immersive. In this state, the pattern board (3) is formed along the interface between the lower acrylic resin layer (2) supplied and formed in the previous step and the upper acrylic resin layer (4) supplied in this step. Retained. Moreover, since both acrylic resin layers (2) and (4) are of the same type of resin, they adhere to each other at the interface and can be easily integrated.

Furthermore, a small amount (several drops) of molten acrylic resin for pattern formation, which is different from the acrylic resin for body formation, is dropped onto the molten acrylic resin layer (4), and immediately after that, a rod-shaped object is used to drop the acrylic resin for pattern formation. The molten acrylic resin for forming the pattern (5) is mixed with the molten acrylic resin layer for forming the main body (4) by stretching or stirring. In this way, the acrylic resin layer (4) and the acrylic resin (5) are both in a molten state and can flow freely, so the acrylic resin (5) for pattern formation can stretch in the stretched direction or If this mixing operation is done properly, the acrylic resin Q (5) will be formed inside or on the surface of the acrylic resin layer (4) as shown in Figure 1 (C).
This means that patterns can be formed freely. In this example, a white-colored acrylic resin was used as the pattern-forming acrylic resin (5), and the pattern was formed only near the bottom rock part of the pattern plate (3), as shown in FIG. It depicts a cloud forming over a rock, with a dragon's head peeking out above it.

As the molten acrylic resin (5) for pattern formation, use one that becomes transparent when solidified but is colored instead of colorless, or one that is colored by mixing a colored substance and does not become transparent. I can do it. Here, the reason why acrylic resin is used as the synthetic resin for forming the pattern is because the synthetic resin for forming the main body is acrylic resin, so we considered its adhesion with this resin, so even if the pattern only covers a small area. For example, it is not necessary to consider adhesion to the resin for forming the main body, so it is possible to use a different type of synthetic resin from the resin for forming the main body.

Note that in this step, materials other than synthetic resins, such as metal powders such as gold powder and silver powder, can also be added as materials for forming the pattern. This makes it possible to form patterns that cannot be drawn with synthetic resin.

After the pattern plate (3) is immersed in the above manner and a pattern is formed using the acrylic resin (5) for forming the pattern, the same molten acrylic resin for forming the main body as the above acrylic resin is gradually poured on top of it. , the inside of the mold (1) is filled as shown in FIG. 1 (Td). At this time, it is necessary to pour the molten acrylic resin for forming the main body so that the formed pattern does not collapse.

Next, when the mold (1) is cooled in this state, the acrylic resin layers (2) (4) (6) forming the main body and the acrylic resin (5) forming the pattern will solidify, so they can be molded. Remove from mold (1). The main body of this molded product is made of acrylic resin, so the interior is colorless and transparent, but the top surface that was in direct contact with the air and the surfaces that were in contact with the mold (1) turned milky white. Because there are
These parts are sanded off with sandpaper or the like, and the front surface of the periphery is polished to a mirror finish using a known method such as puffing.

This allows the inside of the body of the molded article to be easily seen through from the outside.

Finally, by rubbing the four sides of the mirror-finished front surface, excluding the front and bottom surfaces, with sandpaper, etc., fine irregularities are formed on these four surfaces to make the surface rough, making it look like a "frosted glass" surface. Form on similar surfaces. In this way, the molded product is completed.

Fig. 2 and Fig. 3 show the synthetic resin molded figurine manufactured by the above process. This figurine (7) is shown on the front (
8) has a mirror finish, so when viewed from the front (8), the pattern plate (3) embedded inside and the acrylic resin for pattern formation (5) can be seen through the transparent acrylic resin main body. ) can clearly see the pattern formed. The back surface (9), both left and right sides (10), (11), and top surface (12) have frosted glass surfaces, so these surfaces (10), (11), and (12) are translucent. Therefore, only the shadow of the pattern created by the internal pattern board (3) and acrylic resin (5) can be seen.

In the figurine (7) of this example, the bottom surface remains mirror-finished, and there is a bottom plate (1) made of hard opaque synthetic resin.
3) is glued. Therefore, the inside of the main body cannot be seen from the bottom. However, it goes without saying that the bottom surface may be formed into a frosted glass surface.

In the embodiment described above, a mold (1) with an open upper surface is used to insert the pattern plate (3) etc. from above, but the shape and type of the mold (1), the molding method etc. The method can be changed in various ways depending on the purpose of the object to be buried or molded, and the present invention is not limited to the above embodiments. Further, the step of adding the pattern-forming synthetic resin (5) may be performed after the step of burying the investment object such as the pattern board (3), as in the illustrated embodiment. Of course, it may be provided before this step. If it is provided before this step, the position of the pattern formed by the pattern-forming synthetic resin (5) will be reversed from when it is provided after.

In addition, if the raw surface condition after molding behaves almost the same as the surface of frosted glass, in order to simplify the manufacturing process, this surface can be used as is without mirror finishing. Mirror finishing may be applied only to necessary surfaces.

〔Effect of the invention〕

As is clear from the above description, according to the method of the present invention, the transparent synthetic resin molded product to be manufactured passes through the mirror-finished front surface (8) to the pattern plate (3) and the pattern forming part. The acrylic resin (5) can be clearly seen, as well as the back (9), both left and right sides (10) (11), and the top (1).
Since 2) is formed into a frosted glass shape, it is possible to express not only a three-dimensional effect or a sense of depth but also a sense of luxury. Since this increases the artistic effect, it is particularly effective in ornaments such as figurines.

Further, if a step of adding the acrylic resin (5) for pattern formation is provided, it has the effect that a pattern can be freely formed inside the main body using the acrylic resin (5).

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing an embodiment of the method of the present invention, in which (a) is a cross-sectional view of a state in which approximately half of the molten synthetic resin for forming the body is poured into the mold, and (b) is a cross-sectional view of the mold. A cross-sectional view of the state in which a pattern plate is placed on the molten synthetic resin layer for forming the main body in the mold, and the molten synthetic resin for forming the main body is poured in, (c) is the upper molten synthetic resin layer for forming the main body. (d) is a cross-sectional view of a state in which a pattern has been formed using the molten synthetic resin for pattern formation, and (d) is a sectional view of the molten synthetic resin for forming the pattern by pouring the molten synthetic resin for forming the main body on top of the molten synthetic resin for pattern formation to fill the mold. FIG. FIG. 2 is a perspective view of the figurine manufactured by the method of the present invention, as seen diagonally from the front. FIG. 3 is a perspective view of the ornament as seen diagonally from the rear. (1)... Molding mold

Claims (1)

[Claims] 1. A method for producing a transparent synthetic resin molded product using a synthetic resin that becomes transparent at least in a solidified state as a material for forming the main body, the method comprising: placing the synthetic resin for forming the main body in a mold; A process of supplying the body in a molten state and burying the body therein, and a process of solidifying the body-forming synthetic resin in which the body is buried, and then taking it out of the mold and finishing the surface of the molded product with a mirror finish. A method for manufacturing a transparent synthetic resin molded article, comprising the steps of: forming the surface of the molded article in a state similar to that of frosted glass, except for at least the surface from which the buried body is viewed from the outside. 2. A method for producing a transparent synthetic resin molded product using a synthetic resin that becomes transparent at least in a solidified state as a material for forming the main body, the method comprising: supplying the synthetic resin for forming the main body in a molten state into a mold; , a step of burying the implanted body therein, and a step of solidifying the synthetic resin for forming the main body in which the buried body is embedded, and then removing it from the mold and viewing the internal buried body from the outside on the surface of the molded product. 1. A method for producing a transparent synthetic resin molded product, comprising the step of mirror-finishing only the surface of the product. 3. By adding molten synthetic resin for pattern formation,
3. The manufacturing method according to claim 1, further comprising the step of forming a pattern inside the synthetic resin for forming the main body. 4. The addition of the pattern-forming molten synthetic resin is performed after the step of embedding the embedding body in the body-forming synthetic resin supplied in a molten state into the mold. Manufacturing method. 5. The addition of the pattern-forming molten synthetic resin is performed before the step of embedding the embedding body in the body-forming synthetic resin supplied in a molten state into the mold. manufacturing method.