JP3398818B2 - Thermosetting resin molded product and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a thermosetting resin molded article and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, tableware has been manufactured by a compression molding method using a thermosetting resin such as melamine resin. This thermosetting resin material is usually filled with a pulp material for reinforcement.

Since the pulp material may cause stains to adhere, as shown in FIG.
In the surface layer portion of (1), a molding method is used in which a resin (glaze 32) that is almost pure from which the pulp material has been removed is formed into a film (coating).

That is, in FIG.
The molded product 31 is held, and the glaze 32 is put on the molded product 31 to coat the outer surface with the glaze. In this case, the coating layer of the glaze 32 is not formed on the inner surface 34 of the tableware.

In general, plastic tableware often has a pattern. In FIG. 3A, special printed paper (foil 35) with a pattern impregnated and dried with resin is molded, and in the upper layer surface of the foil. The glaze 32 is coated and molded to prevent the design from peeling off and contamination.

In the case of shallow flat dishes such as plates, the surface of the dishes on which dishes are to be cooked, that is, the inner surface is usually painted, and the inner surface is subjected to glaze coating. Since the food is served on the inner side having the pattern, the glaze coating layer can prevent the adhesion of dirt even when the food is served. Further, even if the residue of the food comes into contact with the inner surface of the tableware for a long time, the adhesion of dirt can be prevented.

However, in the case of deep three-dimensional tableware such as cups, bowls, bowls, and bowls, the back side, that is, the outer side, on which the dishes are served is painted, and the glaze coating is formed on the outer side. Is common. Therefore, the glaze coating layer is not formed on the inner surface containing the food. For this reason, tea drinks, cups, etc. become dirty due to the adhesion of tea astringency on the inner surface exposed to tea for a long time during eating. Rubbing the inner surface with a hard object such as a scrubbing brush or steel wool will cause additional scratches, making it more likely to get dirty and shortening the service life of the tableware. In other words, since the inner surface is the base material and is not coated, dirt easily attaches.

[0008] Since tableware is often dipped in a dipping tank (sink) for a long time for the purpose of softening the solidified residual food before washing with a detergent, dirt of the residual food is coated during this immersion. There was a problem that the life of the tableware was shortened by sticking to the uncoated surface.

[0009]

SUMMARY OF THE INVENTION Therefore, the present invention is intended to provide a thermosetting resin molded article and a method for producing the same, which can prolong the life of the molded article.

[0010]

In order to solve the above problems, the present invention takes the following technical means. (1) The method for producing a thermosetting resin molded product of the present invention comprises a step of performing glaze coating molding on the surface of the concave mold of the molded product, and a molded mold obtained by inverting the molded product obtained in the above step upside down. And a step of performing glaze coating molding on the convex surface of the molded product.

The thermosetting resin molded article of the present invention is characterized in that the inner molded article has a concave surface and the outer molded article has a convex surface having a glaze coating layer. And

With the above construction, the glaze coating layer is formed on both the inner surface and the outer surface of the molded product. (2) In this method for producing a thermosetting resin molded product, glaze coating molding is performed on the surface of the concave mold, and the material of the outer core is supplied to the molded product of the inner core that is turned upside down and supplied to the convex mold. It is also possible to include a step of performing molding by means of. (3) There may be a step of performing foil molding between the concave mold of the inner core molded product and the glaze coating layer. (4) There may be a step of performing foil molding between the convex shape of the molded article of the outer shell and the glaze coating layer. (5) The thermosetting resin molded article may have a pattern layer between the concave surface and the glaze coating layer and / or between the convex surface and the glaze coating layer. (6) In addition to dishes such as dishes, bowls, bowls, cups, and lunch boxes, this is a cooking container such as a set, a bat, and a bowl, a tableware storage container, a soap dish, a bath basin such as a washbasin. It can be applied to various other molded articles.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, a small bowl (tableware) which is a container as shown in FIG. 2 is molded using a melamine resin in the process as shown in FIG. Both sides of the inner and outer surfaces are patterned by foil molding. Then, glaze coating molding was performed on both the inner surface and the outer surface of the molded product.

1 (1) to (7) are primary molding steps for forming the inner core 1, and (8) to (12) are inner cores 1 to outer cores 2.
This is the step of secondary molding (main molding) for forming the.

First, the foil 4 is supplied to the molded product of the thin inner core 1 made of the melamine resin 3 in the primary molding ((1) to (2) in the same figure) to form the foil ((3) to (4) in the same figure). ), And the glaze 5 is supplied to form the glaze coating (see the same figure).
(5) to (6)), and a pattern layer 6 and a glaze coating film layer 7 were formed on the surface in the upper mold direction ((7) in the same figure).
The molding of the inner core 1, the foil molding, and the glaze coating molding are three times press molding (the pattern on the inner surface is not shown in FIG. 2). In addition, if only the glaze coating molding is performed on the inner core 1 and the foil molding is not performed, it is 2
Press molding is performed.

Next, in the secondary molding, the upper and lower sides of the primary molding are turned upside down, and the primary molded product is supplied in such a manner that its coating side is in contact with the lower mold 8. Then, the melamine resin 3 which is a raw material for the outer shell 2 is supplied to perform molding ((8) to (9) in the same figure).
), Foil molding (Fig. 10 (10)) and glaze coating molding (Fig. 11) were performed on the upper surface of the opened molded product. The molding of the outer core 2 with respect to the inner core 1, foil molding and glaze coating molding are three times press molding. In addition, only the glaze coating molding is performed on the outer shell 2,
When the foil molding is not performed, the pressing molding is performed twice.

When painting by foil molding, special printing paper (foil 4) with a pattern impregnated and dried with resin is fusion-molded on the surface of the molded article ((3) to (4) and (4) in the figure). Ten)).
By performing glaze coating molding on the upper layer side ((5) to (6) and (11) in the figure), it is possible to prevent peeling of the pattern layer 6 and contamination of the pattern on the paper surface. If the paper surface of the design remains as it is, stains tend to adhere.

Next, the usage state of this embodiment will be described in more detail.

In (1) of FIG. 1, the melamine resin 3 as a raw material is supplied between the cavity mold of the lower concave mold 9 and the core mold of the upper convex mold 10. In (2), the inner core 1 is molded by both molds. In (3), the impregnated paper with a pattern (foil 4) is supplied, and in (4), foil molding is performed with both molds. At (5), both molds are opened to supply glaze 5,
In (6), glaze coating molding is performed. After that, take out as shown in (7).

In (8), between the upper concave mold 12 having the concave groove 11 for the yarn tail of the container and the lower convex mold 8, the raw materials for the inner core 1 and the outer core 2 of the primary molded product are provided. Melamine resin 3 of In (9), the outer core 2 is fixedly molded to the inner core 1. In (10), impregnated paper (foil 4) is supplied to form foil. In (11), glaze coating film layer 7
Is formed. Through the above steps, a completed molded product as shown in (12) is obtained (see FIG. 2).

It should be noted that the dimensions of the die for inner wall thinning of the primary molding and the main mold of the main molding (secondary molding) should be designed in consideration of the shrinkage ratio (about 8/1000) of the melamine resin molded product. preferable.

According to the above, since the glaze coating film layer for preventing contamination is formed on both the inner surface and the outer surface of the molded product, dirt is less likely to adhere, and there is an advantage that the life can be extended as compared with the conventional case.

[0024]

EXAMPLE A small bowl produced as described above was tested for contamination.

A small bowl of the above-mentioned example and a small bowl of a conventional comparative example (glazing coating only on the outer surface) were immersed in a solution of green tea having a normal concentration and continuously boiled for 24 hours, 48 hours and 72 hours. This is a method generally used as an evaluation test for stain resistance of thermosetting resins, plastic food containers, tableware, etc. for food.

Specifically, the solution for boiling the small bowl was prepared by adding 14 g of green tea to 800 cc of water, and covering the aluminum foil sheet in a boiling pot to prevent boiling and continuously boiling.

[0027] As a result, when the evaluation is graded ◎>○>△> × from non-colored to colored, the small bowl (inner and outer glaze coating) of the example is continuously boiled for 24 hours, and the evaluation is ◎, 48 hours. The evaluation after continuous boiling was ◯, and the evaluation after continuous boiling for 72 hours was Δ.

On the other hand, the conventional small bowl (glazing coating only on the outer surface) was evaluated as Δ when evaluated by continuous boiling for 24 hours, × when evaluated by continuous boiling for 48 hours and evaluated as × when evaluated by continuous boiling for 72 hours.

That is, it is considered that the production of a tea drink or the like as in the above embodiment has a great advantage in preventing the contamination of tea astringent, and that it has the same effect on other foods such as coffee, soy sauce and sauce.

[0030]

The present invention having the above-mentioned structure has the following effects.

Since the glaze coating layer is formed on both the inner surface and the outer surface of the molded product, it is possible to provide a thermosetting resin molded product which can prolong the life as compared with the conventional case and a method for producing the same.

[Brief description of drawings]

FIG. 1 is a diagram illustrating steps of an embodiment of a method for producing a thermosetting resin molded product of the present invention.

FIG. 2 is a partially cutaway perspective view illustrating a structure of an embodiment of a thermosetting resin molded product of the present invention.

FIG. 3 is a diagram illustrating steps of a conventional method for manufacturing a thermosetting resin molded product.

[Explanation of symbols]

1 Uchiko 2 Gaiko 6 picture layers 7 Glaze coating layer 8 convex mold

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 43/14 B29C 43/18-43/20 B29C 43/32-43/36 B32B 27 / 42,1 / 02,33 / 00

Claims (6)

(57) [Claims] 1. A step of performing glaze coating molding on a concave surface of a molded product, a step of turning the molded product obtained in the above step upside down and supplying it to a convex mold, and a convex mold of the molded product. And a step of performing glaze coating molding on the surface of the thermosetting resin molded article. 2. A step of supplying a raw material of an outer core to a molded product of an inner core, which is subjected to glaze coating molding on a surface of a concave mold and turned upside down and supplied to a convex mold, to perform molding. 1. The method for producing a thermosetting resin molded article according to 1. 3. The method for producing a thermosetting resin molded product according to claim 2, further comprising a step of performing foil molding between the concave mold of the inner core molded product and the glaze coating layer. 4. The method for producing a thermosetting resin molded article according to claim 2, which further comprises a step of performing foil molding between the convex shape of the outer molded article and the glaze coating layer. 5. A thermosetting resin molded product comprising a concave-shaped surface of an inner molded product and a glaze coating layer on a convex surface of an outer molded product. 6. The thermosetting resin molded article according to claim 5, which has a pattern layer between the concave surface and the glaze coating layer and / or between the convex surface and the glaze coating layer.