WO2007015565A1

WO2007015565A1 - Process and equipment for the production of thermosetting resin moldings

Info

Publication number: WO2007015565A1
Application number: PCT/JP2006/315553
Authority: WO
Inventors: Hiroshi Arakawa
Original assignee: Yamatokako Co., Ltd.; Threeline Co., Ltd.
Priority date: 2005-08-04
Filing date: 2006-07-31
Publication date: 2007-02-08
Also published as: JP4229972B2; MY145153A; CN101237977A; CN101237977B; TWI345523B; JPWO2007015565A1; TW200730326A; KR100978378B1; HK1119417A1; KR20080038149A

Abstract

A process for the production of thermosetting resin moldings by molding and setting a thermosetting resin by use of concave and convex molds, which comprises conducting continuously the following steps (a) to (d): the step (a) of forming a substrate on the convex mold with the molds closed, the step (b) of subjecting the outside face of the substrate to at least single glaze coating, the step (c) of transferring the coated substrate to the concave mold side from the convex mold side, and the step (d) of subjecting the inside face of the substrate attached on the concave mold to at least single glaze coating and which can give, in one series of steps continuously, beautiful thermosetting resin moldings inhibited from deterioration with time caused by using, e.g., stain or gloss reduction; and equipment for the production of the moldings.

Description

Method and apparatus for manufacturing thermosetting resin molded product

Technical field

The present invention relates to a method and an apparatus for manufacturing a thermosetting resin molded article, and more particularly, to the inner and outer surfaces using one type of mold including a convex mold and a concave mold.

Glaze coating or a method and a writing apparatus for continuously producing a thermosetting resin molded article with a picture or a pattern on its inner and outer surfaces, and a glaze coating: layer on its outer surface in a series of steps. About.

Background art

Conventionally, thermosetting resins such as phenolic resin, melamine resin, and urea resin have been widely used in the manufacture of molded products such as tableware, cooking utensils, food storage containers, and toiletries by the compression molding method. Thermosetting resin molding materials are usually filled with reinforcing materials such as pulp materials for reinforcement.

However, a single-molded product of a thermosetting resin molding material is easily contaminated during use due to the influence of a reinforcing material such as a pulp material. Therefore, in general, a resin (for example, melamine) is formed on the surface layer of a molded product. Glaze coating molding is performed to coat only the glaze of a resin (such as N-formaldehyde).

That is, in general, for example, as shown in steps (1) to (7) in FIG. 1, which shows a typical molding process, the thermosetting resin 1 is pressed by using the concave mold 3 on the convex mold 2. Hold the compacted body (base) 4 (see steps (1) and (2) in Fig. 1), and then add glaze 5 as shown in steps (5) and (6) in Fig. 1. Glazed 5 using concave mold 3 on the outer surface 6 of the molded product Perform molding. In this case, the molding 7 has a glaze coating on its outer surface, and no glaze 5 coating layer is formed on its inner surface 8.

Furthermore, when these molded products are used as tableware, etc., in order to increase the commercial value, a pattern or pattern is often put on the surface of the molded product 7, and in this case, as shown in FIG. Process (3) and (4) are added to form a special printing paper (foil) 9 that has been impregnated with resin and dried, and is glossed on it as described above in steps (5) and (6) of Fig. 1. In order to prevent deterioration due to decline or contamination, it is common to perform glaze 5 coating using a concave mold 3.

As mentioned above, regardless of the type of pottery, plastics, etc., shallow flat tableware such as plates usually has a pattern on the inner surface where food is served, □, and a glaze on the thermosetting resin molded product. By applying the coating process, it is possible to suppress the adhesion and stains of the dishes placed on the inner surface by this glaze layer.

However, deep three-dimensional tableware such as cups, pots, bowls, and bowls have a pattern on the outer surface that is often seen as a thermosetting resin molded product, and is often glazeed. -Ting forming is generally performed. Therefore, no glaze layer is formed on the inner surface in contact with food. For this reason, cups, cups, etc. come into direct contact with drinks, etc., and dirt is attached with tea, coffee, etc., the inner surface becomes dirty, and the gloss also decreases. Also, if you remove the dirt with a hard object such as Nylon Yuya Cleanser, the inner surface will be scratched and the dirt will be more likely to get dirty. In addition, when washing dishes, in order to soften the residue attached to the dishes, it is often immersed in hot water for a long time-but at this time, the residue adheres to the surface without the glaze layer and becomes contaminated- There is a problem that it is easy.

To solve this problem, Japanese Patent No. 3 3 8 8 1 8 For this, two types of molds are used. First, a glaze coating layer is provided on the inner surface of the molded product, and then the semi-molded product is taken out of the concave mold and transferred to the convex mold. It has been proposed to provide a glaze coating layer on the surface. However, in this method, the half-molded product is taken out in the middle of the process and transferred onto the surface of another mold (convex mold), so the manufacturing process is discontinuous, and the semi-molded product is transferred to the mold. Since it is removed more and is left as it is, it is cooled and molding shrinkage begins. Since this mold shrinkage changes with time, when making another mold (convex mold), it is necessary to allow for shrinkage. However, it is difficult to determine the expected amount, and there is a problem that there is a restriction on the molding work, such as making the time to leave after taking out the semi-finished product to some extent to ensure a certain amount of deformation. . In addition, it is well known to those skilled in the art that thermosetting materials are difficult to maintain a constant mold shrinkage speed for each production lot of the material, and as is well known, the expected amount of shrinkage depends on experience. There is still room for improvement in that control of process operations becomes complicated and defective products are likely to occur.

Disclosure of the invention

Therefore, in view of the above-described conventional technology, the object of the present invention is to use a single mold to form a thermosetting resin molded product that can suppress deterioration due to contamination, gloss reduction, and the like. It is to provide a method and an apparatus for continuous production at the same time. .

According to the present invention, in manufacturing a thermosetting resin molded product by molding and curing a thermosetting resin using a mold comprising a concave mold and a convex mold, (a) closing the mold and (B) Form at least one glaze coating on the surface of the substrate. (C) Move the molding from the convex mold side to the concave mold side (or from the concave mold side to the convex mold side), and (d) concave mold side (or convex mold side) A method for producing a thermosetting resin molded article in which a series of steps of performing glaze coating molding at least once on the surface of the molded article adhering to (3) is continuously provided, and a molded article produced thereby is provided. The

According to the present invention, a raw material thermosetting resin supply device, a mold comprising a concave mold and a convex mold, a mold opening and closing device, a mold heating and pressurizing device, and a coating molding Glaze supply device, foil supply device for painting molding, moving plate provided in the mold, and a thermosetting resin molding including a convex mold and a concave mold of the moving plate, and a fixing device detachable from the concave mold. A product manufacturing apparatus and a molded product manufactured thereby are provided.

In a preferred aspect of the present invention, the movement of the molded product when the mold of the step (c) is opened is performed by removing the portion of the burr that flows out from the cavity when the substrate is formed, as described below. It can be done by holding it with a moving plate fixed to one side of the mold and moving the molding to the other side of the mold. In the present invention, the surface of the molded product can be further provided with a process of further performing at least one foil molding before the glaze coating molding, and the molded product adhered to the other side of the mold. The surface can be molded at least once before dulling coating. Further, it is possible to further perform a step of forming a foam on the surface of the molded article attached to one side of the mold and a step of forming an oil on the surface of the molded article attached to the other side of the mold or Z. Then, the foam molding is performed between the step of performing the foil molding on the surface of the molding adhered to one of the molds and / or the surface layer of the molding adhered to the other of the molds and the glaze layer. You can also do it. An apparatus for manufacturing a thermosetting resin molded product according to the present invention includes: a raw material thermosetting resin supply device; a mold including a concave mold and a convex mold; and a mold opening / closing device

, Heating and pressurizing clothes, glaze feeding device for coating molding, film feeding device for painting molding, movable plate and movable plate detachable fixing device provided in the mold Of these, among them, the following explanation can be made except for the moving plate に and its fixing device provided in the mold.

According to the present invention, when a thermosetting resin is compression-molded to produce a container such as tableware or other molded products, a pattern such as a pattern is opened and closed while opening and closing a single mold composed of a concave mold and a convex mold. Since foil molding and glaze coating molding are performed, the upper and lower settings of the concave and convex molds of the same mold are used.

Ό, Molding α

Oil formation and glaze coating such as a pattern can be continuously applied to both the outer and inner surfaces of the kite in a series of steps. Brief Description of Drawings

FIG. 1 is a drawing for explaining a molding process for producing a conventional thermosetting resin molded product.

FIG. 2 is a drawing for explaining the molding process for producing the thermosetting resin molded article of the present invention.

FIG. 3 is an explanatory view showing a state outside the mold in the molding process for producing the thermosetting resin molded article of the present invention.

FIG. 4 is an explanatory view showing the moving mechanism of the semi-molded product of the present invention.

FIG. 5 is a view showing an example of the moving plate of the present invention device and its fixing device.

FIG. 6 is a drawing showing an example of a moving plate and its fixing method in a molding process in which two thermosetting resin molded products are manufactured simultaneously. FIG. 7 is a drawing showing an example of a moving plate and its fixing method in a molding process in which four thermosetting resin molded products are manufactured simultaneously. BEST MODE FOR CARRYING OUT THE INVENTION

A preferred method for producing a thermosetting resin molded article according to the present invention is as shown in steps (1) to (11) in FIGS. 2 and 3, and in steps (1) and (2), As in 1, the thermosetting resin 1 1 is compression-molded in the convex mold 1 2 and the molded product is held. Glaze coating molding is performed using resin such as melamine-formaldehyde in the same manner as in the conventional method using glaze 15 on the outer surface 16 of this molded product 14 and concave mold 1 3. Steps (5) and (6) in FIGS. 2 and 3), and then the molded product 17 is glazed on the outer surface 16 of the molded product as shown in steps (9) to (10) in FIGS. Is applied to the concave mold, and coating of glaze 15 is also applied to the inner surface 18 of the molded product 17. In order to obtain such a thermosetting resin molded product 17, glaze coating is applied to the outer surface 16 of the molded product 14, and the convex mold 1 2 and concave mold are used for the inner glaze coating in the next process. When 1 3 is opened, this semi-molded product must be moved to the concave mold 13 side on the side subjected to glaze coating, as shown in step (9). —

When compression molding a thermosetting resin molding material, as is well known to those skilled in the art, the resin input is adjusted so that some excess material overflows from the mold cavity. If this extra material is not supplied, sufficient pressure will not be applied to the molded product, resulting in poor strength and gloss, and a satisfactory molded product cannot be obtained. In the present invention, this overflowing portion 2 1 (commonly called a burr) is used to move the burr portion 2 1 attached to the mold on one side as shown in (4) of FIG. 2 is in close contact. In the following description, the burr part 2 1 in Fig. It shall be called.

At both ends of the moving plate 2 2, hook means 2 3 are attached. As shown in FIGS. 4 (1) and (2), either the concave mold 1 3 or the convex mold 1 2 has The moving plate is fixed by means of fixing means 23, for example, hook means 23. If the hook means 2 3 for fixing the moving plate 2 2 is connected to the convex die 1 2, the moving plate 2 2 is moved to the concave die side if it is connected to the concave die 1 3. Along with this, the molding burr part 2 1 is also moved up and down by the molding plate 2 2 being moved up and down in the molding process. The moving plate contacting the part of the molding burr 21 holding the movement of the molding The shape of 2 2 is not particularly specified, and may be circular, square, elliptical, or other shapes depending on the shape of the molded product. Further, the portion of the moving plate 2 2 that contacts the fabrication burr section 2 1 may be the entire circumference or a part of the fabrication burr section 2 1 as long as the half-molded product being molded can be moved. Also good.

According to the present invention, glaze coating can be performed on the inner surface 18 of the molded article 17 by the steps (9) and (10) of FIGS. 2 and 3 in the same manner as in the steps (5) and (6). it can.

In the preferred embodiment of the present invention, the outer surface and / or the inner surface of the molded article 17 is illustrated in FIG. 1 in steps (3) and (4) or steps (7) and (8) of FIGS. Foil molding can be performed in the same manner as above, and patterns and patterns can be put on the inner surface and Z or outer surface of the final molded product. Example

In the following, the embodiment of the present invention will be described with reference to steps (1) to (11) shown in FIGS. A description will be given below with reference to the drawings, taking as an example an embodiment in which each outer surface is painted and glaze coating molding is performed on both sides.

The steps from Fig. 2 and Fig. 3) to (6) are for painting the outer surface of the molded product and performing glaze coating on it, and steps (7) to (10) are for painting on the inner surface. The process of performing glaze coating is shown, and step (11) shows the process of taking out the finished product.

First, in the process (1) of FIGS. 2 and 3, the melamine resin molding material 11 is supplied between the convex mold 12 and the concave mold 1 3, and in the process (2) of FIGS. Close the mold and mold the green body 1 4. The molding conditions are determined according to the type of the thermosetting resin to be used and the molded product as before, and there is no particular requirement for the present invention. In the process (3) of Figs. 2 and 3, the printed paper (foil) 19 that has been dried by impregnating the outer surface 16 of the green molded body on the convex mold 12 with resin (for example, melamine resin) and drying it is used. Supply from the outside, close the mold in step (4), and the foil under the specified conditions (for example, 1 5 0 to 1 80 X: X 1 5 to 60 seconds, most preferably in the case of melamine resin 1 60 and X 30 seconds). In step (5) of FIGS. 2 and 3, the mold is opened to form the foam 19 and then glaze 15 is supplied. In step (6), glaze coating is performed. In step (7), when the mold is opened, the mold 19 is supplied to the convex mold 1 2 in the same manner as above, with the molding moving toward the concave mold 1 3. Close the mold in (8) and mold the oil. As a result, the oil 19 is fused to the inner surface of the molded product. In step (9), glaze 15 is supplied between the oil layer on the inner surface and the convex mold, and in step (10), the mold is closed and glaze coating is performed on the inner surface of the molded product. Through the above steps, a molded product 17 having foil and glazing applied to the inner and outer surfaces of the molded product can be obtained.

The molded product obtained in this way has a molding port outer surface and In addition, since it is painted on both sides and glaze-coated on both sides, there is an advantage that deterioration due to contamination over time or deterioration in gloss due to use can be suppressed.

Next, supply of oil to the outer surface of steps (3) and (5) in FIGS. 2 and 3 and position of the molded product in supplying glaze and supply of oil to the inner surface of steps (7) and (9) This mold has the structure shown in Fig. 4 (1) to (4) and Fig. 5, and (1), (2) and Fig. 5 in Fig. 4 are explained. Is a side view with the mold closed, with the hooks 2 3 hanging on the lower mold, that is, the convex mold 1 2 and the concave mold 1 3 of the upper mold, respectively. (3) in Fig. 4 shows the moving plate 2 2 between the concave mold 1 3 and the convex mold 1 2, and (4) in Fig. 4 shows the structure of the fabrication burr section 2 1. Note that 25 is a molded product. With the mold closed, hook 2 3 is hooked onto either concave mold or convex mold rod 2 4 and connected so that when the mold is opened, the moving plate moves to the connected side. It is possible to adopt a configuration in which the molding 22 moves up and down and the molded product moves accordingly. The number of hooks 23 is usually two, one on the opposite side of FIGS. 4 (1) and (2), but more may be provided. In order for the molded product to move up and down, as shown in Fig. 4 (4), the molding burr 2 1 of the molded product is supported by the moving plate 2 2. Need strength.

The state of the moving plate 22 in the molding process is as shown in the side views (1) to (11) of FIG. That is, first, (1) to (5) in Fig. 3 show that the hook 2 3 is hooked on the convex mold 1 2 from the molding of the substrate to the outer surface painting and the glaze coating molding. Indicates the attached status. Next, (7) to (10) in Fig. 3 shows that the hook 2 3 is hooked on the concave mold 13 and the moving plate 2 2 is attached to the concave mold 13 side accordingly. The states of movement are sequentially shown.

There is no particular limitation on the dimensions of the fabricated burr section 21 in contact with the moving plate. Force s, thickness 0.2 to 5 mm is preferable, thickness 0.3 to; L mm is more preferable, and width 0 3 to 50 mm is preferable, and a width of 1 to 20 mm is more preferable.

If the thickness is less than 0.2 mm, the molded burr may not be strong enough to move the molded product, and the fabricated burr may be damaged.If the thickness exceeds 5 mm, the finishing operation to remove the created burr becomes difficult. . If the width is less than 0.3 mm, the burr part may not be applied to the moving plate due to molding shrinkage. If the width exceeds 50 mm, it is difficult to remove the fabricated burr part. · Fig. 6 and Fig. 7 show an example of the moving plate and its fixing method in the molding process of simultaneously manufacturing 2 and 4 thermosetting resin molded products, respectively. Fig. 6 (1) or Fig. 7 (1) shows one example of the moving plate 3 2 or 4 2, and Fig. 6 (2) or Fig. 7 (2) shows the assembly of concave mold 3 1 or Fig. 6 (3) or Fig. 7 (3) shows the assembly of concave molds 3 1 or 4 1 (including a semi-molded product with a green body inside). 3 2 or 4 2 The lower through hole 3 4 or 4 4 is fixed in a state where the mold is opened with the through pin 3 3 or 4 3 passing through. In addition, the semi-molded product obtained by molding with a convex mold assembly (not shown) has a thickness and thickness sufficient to support the semi-molded product (for example, 0.3 mm or more). The semi-molded product can be moved together to the concave die assembly 3 1 or 4 1. Further, the through pin 3 3 or 4 3 automatically moves the concave die assembly 3 1 or 4 1 up and down by electrically controlling and moving the through pin in the direction of the arrow using, for example, an air cylinder. Can be made. In Fig. 7, reference numeral 45 denotes a guide pin. Contamination tests were conducted on the melamine resin hot water smelt produced as described above by the following method. First, 14 40 cc of water was put into a stainless steel container, and Nescafe (trademark) 80 g, Creep (trademark) 45 g and sugar 50 g were put therein. This is about 4 to 5 times the concentration of regular coffee drinks. In this, the bath of the embodiment of the present invention and the bath of the conventional comparative example (similarly painting and glazing coating only on the outer surface) are immersed, and then a holed lid is placed, and water is poured into the hole. Attach a reflux condenser to prevent evaporation for 6 hours, 12 hours, 24 hours, and boil continuously. The results are shown in Table I below.

Table I

Contamination values in Table I are “0” for no coloration, “1 0” for brown coloration, and at the same time, the gloss is inspected and “0” for no change. The result was visually evaluated step by step as "1 0".

As described above, the degree of contamination on the inner surface of the comparative example is very large, and the degree of contamination on the inner surface and the outer surface of the molded product is small. In addition, the gloss of the example did not decrease on the inner surface and the outer surface, whereas the inner surface of the comparative example decreased in gloss.

In this way, the cups produced as in the examples have great benefits in preventing coffee contamination, and the same applies to other foods such as tea and seasonings. It is thought that there is an effect. It also has the effect of suppressing gloss reduction. Deteriorated gloss cannot be recovered with detergents or bleaches, so prevention of glare is very important for maintaining the value of dishes. Industrial applicability ''

In the present invention, the inner surface and the outer surface of a molded product are painted on both sides, and a series of processes for applying glaze coating is continuously performed on the molded product to cause deterioration due to contamination, gloss reduction, etc. during use. We can provide thermosetting resin molded products and methods for manufacturing them, so that washing, bleaching, and disinfecting storage can be used in hospitals, elderly facilities, schools, employee cafeterias, etc. Useful for use as a collective meal tableware.

Claims

1. When manufacturing thermosetting resin molded products by molding and curing thermosetting resin using a mold consisting of concave mold and convex mold.

(A) Close the mold and mold the substrate on the convex mold (or in the concave mold); (b) Apply at least one glaze coating on the surface of the substrate.

(C) move the molding from the convex mold side to the concave mold side (or from the concave mold side to the convex mold side), and (d) concave mold side (or convex mold) A method for producing a thermosetting resin molded product, characterized in that a series of steps of performing at least one glaze coating molding is continuously performed on the surface of the molding adhered to the side).

Surrounding

2. The movement of the molded product from the convex mold side to the concave mold side (or from the concave mold side to the convex mold side) when opening the mold in the step (c) is performed during molding of the substrate. The manufacturing method according to claim 1, wherein the burr portion that has flowed out of the bite is mounted on a moving press fixed to a mold.

3. The production method according to claim 1 or 2, further comprising a step of performing at least one foil molding on the surface of the molded article attached to the convex mold side before the glaze coating molding.

4. The production method according to claim 1 or 2, further comprising a step of performing at least one foil molding on the surface of the molded article attached to the concave mold side before the glaze coating molding.

5. The method according to claim 1 or 2, further comprising a step of forming a foam on the surface of the molded article attached to the convex mold side and a step of forming a foam on the surface of the molded article attached to the concave mold side. The manufacturing method as described.

6. The step of forming a foam between the base of the molded product adhering to the convex mold and the glaze layer and / or the forming of the oil between the base of the molded product adhering to the concave mold and the glaze layer. Further comprising the step of performing A method for producing a thermosetting resin molded article according to claim 1 or 2.

7. The thickness of the fabrication burr necessary for moving the molded product to the concave mold or the convex mold is 0.2 to 5 mm, and the width is 0.3 to 50 mm. The manufacturing method of the thermosetting resin molded product as described in any one of.

8. A thermosetting resin molded article obtained by the method according to any one of claims 1 to 7. '

9. Raw material thermosetting resin supply device, mold made of concave mold and convex mold, mold opening and closing device, mold heating and pressurizing device, glaze supply device for coating molding, painting molding The apparatus for producing a thermosetting resin molded product comprising a foil supply device for use, a moving plate provided in a mold, and a fixing device for a moving plate that can be attached to and detached from the convex mold and the concave mold.