JP2000318039A - Foamed acrylic plate and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a raw material for an illuminating implement or the like by forming a foamed state of desired particle size on one or both front and rear surfaces of an acrylic plate. SOLUTION: An acrylic plate 1 is placed on a heating plate 2 such as an iron plate or the like, a lower portion of the plate 2 is heated at 0 to 300 deg.C by a burner 3 or the like to generate foaming between the plate 1 and the plate 2. After the foamed state is ascertained to meet a decorating object or the like of a product, the heating is immediately stopped. Then, the plate is pressed on a forming die, and formed. Then, when a foamed site is cooled, a product in which a desired foamed state is retained is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a material for producing a lighting fixture, other household articles, etc. by processing an acrylic plate.

[0002]

2. Description of the Related Art An acrylic plate is a synthetic resin plate characterized by having a transparency like that of a transparent glass and a strength greater than that of glass, and is used for various purposes such as lighting equipment and household goods. Is well known. It is also true that by removing the transparency characteristics of this acrylic plate and making it translucent or opaque, its taste changes, for that purpose, search the surface using a grinding tool or use a chemical Processing the surface is conceivable.

[0003]

However, machining the surface of an acrylic plate using a tool or a chemical causes a problem of post-treatment of grinding chips and a dissolved resin, and cannot always achieve a desired effect. .

[0004] Therefore, the present invention aims to foam the surface of an acrylic plate by a simple processing method and to use the foamed material as a material for various applications such as lighting equipment and household goods.

[0005]

The foamed acrylic plate according to the present invention is characterized in that the foamed state remains on all or a part of the front or back surface of the acrylic plate as described in claim 1. I do.

According to a second aspect of the present invention, there is provided a method for producing a foamed acrylic plate, wherein the whole or a part of the front surface or the back surface of the acrylic plate is heated to form foam particles at a stage when the acrylic plate is in a foamed state. After determining the particle size and immediately stopping the heating,
The foamed part is pressed against a mold and cooled to leave foaming traces of a required particle size on all or part of both or one of the front and back surfaces of the acrylic plate.

Furthermore, in the above method, the heating temperature is in the range of 250 ° C. to 300 ° C.

Accordingly, it is possible to obtain an acrylic plate having an acrylic resin foamed portion or a foamed portion on both or one of the front and back surfaces, and can be used as a material in various applications.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a transparent acrylic plate 1 of a predetermined size is placed on a heating plate 2 such as an iron plate, and a lower portion of the heating plate 2 is heated by a burner 3. The predetermined size of the acrylic plate 1 refers to an object to be manufactured from the acrylic plate, for example, a shape obtained by cutting a transparent acrylic plate into a required disk shape when a lamp shade is intended. However, after processing a predetermined square size, it may be cut into a required disk shape. When the heating temperature is between 2500 and 300 ° C. for 5 to 10 minutes (approximately 5 minutes for a plate thickness of 3 mm and approximately 10 minutes for a plate thickness of 5 mm), foaming occurs on the heating surface of the acrylic plate 1. At a temperature exceeding 300 to 350 ° C., the acrylic plate 1 is incinerated.

When the foaming state of the acrylic plate 1 is determined, the acrylic plate 1 is removed from the heating plate 2 immediately after the particle size (size) of the foam particles (foam) 4 reaches a desired value, and heating is stopped. As shown in FIG.
To form while cooling by light pressing. By pressing on the molding die 5, the heated acrylic plate 1 can be easily deformed to form a desired shape, and a specific lighting fixture or household article can be easily molded. By this cooling, countless foam particles 4 are rapidly cooled, and the foamed state remains on the surface of the acrylic plate 1, and the foamed acrylic plate 6 as shown in FIGS. 3 and 4 is manufactured.

Depending on the particle size of the foam particles 4, the foamed acrylic plate 6 may have a seemingly turbid state such as ground glass, or may have a semi-transparent state in which a transparent foam adheres to the surface. The various things can be done.
These are interesting from decorative detection due to refraction of light.
The particle size of the foam particles 4 depends on the heating temperature and time. When the heating time is short, the particle size of the foam particles 4 is small, and when the heating time is long, the particle size becomes large. Therefore, the foamed acrylic plate 6
It is important to determine the particle size of the foam particles 4 from a decorative point of view in consideration of the purpose of use. The surface of the acrylic plate 1 to be foamed can be the same on both the front and back surfaces or on one surface. In addition, by changing the particle size of the foam particles 4 on the front and back surfaces, a foamed acrylic plate 6 having a different interest can be manufactured.

The heating of the acrylic plate 1 may be performed on the entire acrylic plate 1 or on a part of the acrylic plate 1. A part of the acrylic plate 1 is foamed from a decorative point of view. For example, as shown in FIG. 5, a heating plate 7 having a predetermined shape heated at a predetermined temperature is applied to the acrylic plate 1 as shown in FIG. 1, the heating plate 7 is removed when the desired foam particle size is achieved, and the removed foaming portion is not heated. Fig. 6
The foaming state as shown in FIG.

In this case, the above-mentioned changes in the heating temperature or time are applied to the foamed portion 8 having the smallest particle size, the foamed portion 9 having the largest particle size, and the foamed portions 10 to 12 being successively larger in the middle therebetween. It is also possible to make changes that are different. Therefore, the foamed acrylic plate 6 is the front or back surface of the acrylic plate 1 as a material (foamed portion represented by reference numeral 13).
Thus, the foamed portions 8 to 13 having a desired pattern or shape are formed. The foamed portions 8 to 13 may be the same on the front surface and the back surface, or may be different. When such a foamed acrylic plate 6 is formed into a required product, the foamed acrylic plate 6 is heated in a required atmosphere temperature to be soft,
The desired shape can be obtained by pressing the mold.

Therefore, such a foamed acrylic plate 6
As a material, besides lamp shades or lamp shades, window displays and other lighting fixtures, various products such as cups, dishes and other kitchen utensils, trays, pen dishes and other office supplies can be molded and widely used as materials. .

[0015]

According to the present invention described above, it is possible to obtain an acrylic plate having a foamed portion or a foamed portion of an acrylic resin on both or one of the front surface and the back surface. It can be used as a material for household appliances such as lighting fixtures, kitchens or office supplies, and can be widely used in the field of construction.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one process of manufacturing.

FIG. 2 is an explanatory view showing a second step of the manufacturing.

FIG. 3 is a plan view of a foamed acrylic plate.

FIG. 4 is an enlarged longitudinal sectional view of the foamed acrylic plate shown in FIG.

FIG. 5 is an explanatory view showing a special manufacturing process.

FIG. 6 is a plan view of the foamed acrylic plate according to FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Acrylic plate 2 ... Heating plate 3 ... Burner 4 ... Foam particle 5 ... Molding die 6 ... Foamed acrylic plate 7 ... Heating plate 8-13 ... Foamed part

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[Procedure amendment]

[Submission date] April 3, 2000 (200.4.3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

2. Description of the Related Art An acrylic plate is a synthetic resin plate characterized by having a transparency like that of a transparent glass and a strength greater than that of glass, and is used for various purposes such as lighting equipment and household goods. Is well known. It is also true that by removing the transparency characteristics of this acrylic plate and making it translucent or opaque, its character changes, for that purpose, the surface is ground using a grinding tool or using chemicals Processing the surface is conceivable.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 9:00 C08L 33:04

Claims (3)

[Claims] 1. A foamed acrylic plate characterized in that a foamed state remains on all or part of the front or back surface of the acrylic plate. 2. The whole or part of the front or back surface of the acrylic plate is heated, and when the foamed state is reached, the particle size of the foam particles is checked, heating is immediately stopped, and the foamed part is pressed against a mold to cool. A method for producing a foamed acrylic plate, characterized in that a foamed state of a required particle size is left on all or a part of both or one of the front surface and the back surface of the acrylic plate. 3. The method according to claim 2, wherein the heating temperature is in the range of 250 to 300 ° C.