JP6702727B2 - Patterned rotating body molded article and its molding method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rotary molded article such as tableware having unevenness and a color pattern, and a method for molding the same.

In the present specification, the molding member is a member obtained by molding a molding material, and requires further processing to form a final product molded product. The molded product is a tableware or the like that is a final product created by molding. The rotator is a rotator in shape and its apparent shape does not change even when the rotator is rotated about the rotation center line. However, even if it is a regular polygon, the apparent shape does not change if it is rotated by 360°/number of angles around the polygon center, for example, if the square is rotated by 90°. The regular polygon is included in the rotating body in the present specification. The tableware is a utensil/container used for meals, and examples thereof include a bowl, a plate, a bowl, a tray, and a tea bowl.

As a conventional method for producing molded products such as tableware with a pattern, a method is proposed in which the inner and outer surfaces of a thermosetting resin molded member are heat-bonded by pressure-bonding and heating a foil with a melamine resin impregnated and dried. (For example, see Patent Document 1). In this method, a painted foil is attached only to the side trunks of the inner and outer surfaces of the molded member, and a transparent coating layer of melamine resin is provided only on the inner surface of the molded body.

Another conventional technique is a grain-forming method for a two-color molded product obtained by laminating two layers of thermosetting resins of different colors, and first reducing the curing degree of the primary molded product with a primary molding die. Then, the primary molded product is loaded into the secondary molding die in which the unevenness for embossing is formed on the mold surface so as to hit the unevenness for embossing, and the secondary molding is performed. There has been proposed a method for forming a texture in a two-color molded product, in which texture-forming irregularities are pressed against the surface of the mold to form a texture (for example, see Patent Document 2).

As another prior art, there is provided a molded product in which the color of the inside and the outside is different by using a molding material of different colors by using one convex mold and two concave molds, and a moving plate combined with the convex mold, There has been proposed a method of continuously producing a thermosetting resin molded product having (a) an optional pattern and (b) a glaze coating on both sides in a series of molding steps (see, for example, Patent Document 3). In the method, when a set of molds including one convex mold and two concave molds is used, (a) first, the convex mold and the first concave mold are combined, and the first molding is performed. After molding the material base, and then moving the concave mold together with the inner base molded product by the moving plate, (a) optional pattern and (b) glaze coating in order on its inner surface. To form a primary molded product which is the inner side of the molded product, and (b) combines a convex mold including the primary molded product and a second concave mold with a second color of a color different from that of the first base material. The base material of the molding material is molded on the outer side of the inner primary molded product, and then the outer surface of the molded product is molded by sequentially applying (a) an optional pattern and (b) glaze coating.

As still another conventional technique, there is provided a molding method in which a coating material is provided on the inner and outer surfaces of a molding member, the molding material is housed in a mold, and a primary molding step of molding the primary molding member by compression molding, and the primary molding member. Receiving the coating material in the mold after being removed from the mold, then re-accommodating the primary molding member on the coating material, and then accommodating the coating material on the primary molding member, A method including a coating treatment step of obtaining a double-sided coated molded article by performing a coating treatment by compression molding has been proposed (for example, see Patent Document 4).

JP, 2007-160924, A Japanese Patent No. 2509532 Japanese Patent No. 4785876 Japanese Patent No. 5685711

A molded product, which is proposed by the above-mentioned Patent Document 1 or the like, in which a painting foil is pressure-bonded and heated to be welded to a molding member, has a flat pattern and is similar to a brush-drawn picture of a watercolor paint. It has no irregularities, is the same as conventional pottery and molded products, and is less attractive.

The molded product molded by the method proposed in Patent Document 2 and the like is a two-color molded product. In addition to being complicated and meticulous in the manufacturing process, this embossing is simply a relief of the opaque material, and the appearance formed by embossing is simple and boring.

The molded product molded by the method proposed in Patent Document 3 and the like is interesting due to the difference in color between the inner surface and the outer surface of the molded product. However, the manufacturing method is complicated and three molding dies must be prepared. The outer surface of the molded product is a flat surface formed by crimping a film with a pattern, and the glaze coating merely makes the outer surface of the vessel smooth and shines by reflection, and there is no new idea or interestingness of the molded product. Do not bring.

The method proposed by the Patent Document 4 and the like has a flat pattern and does not have the general unevenness similar to the handwriting of watercolor paint, and is the same as the conventional pottery and molded articles. It is not very attractive. In addition, some glazes are typically fed onto molded parts that are cooled below about 150°C, and some glazes are on molds that are maintained at high temperatures, typically around 150°C. As supplied, both glaze coatings are partially made under different conditions, and there is a problem that a physically homogeneous glaze coating cannot be performed.

(Purpose of the invention)
The present invention has been made in view of the fact that the conventional manufacturing method is complicated, but the molded article produced by the method is immutable. The present invention, the number of molds is the same as the conventional, the molding step is substantially the same as the conventional, for example, the grain pattern is three-dimensional and very similar to the real thing of crafts such as wood cuttings, it looks It is an object of the present invention to provide a patterned rotating body molded article that has a high-grade feeling and is comfortable to use, and a molding method thereof.

The present invention is also capable of providing an uneven pattern and a glaze coating on all of the inner body and outer surface of the body and bottom of the rotating body molding member, and is much more similar to a wood cutting product, ie, a craft product, than a conventional resin molding product. It is an object of the present invention to provide a patterned rotating body molded article which has an appearance and which can effectively prevent the inside of a molded member from permeating and contaminating the contents such as curry due to long-term use, and a molding method thereof.

It is another object of the present invention to provide a patterned rotating body molded article and a molding method thereof, which can provide a uniform glaze coating on all the inner and outer surfaces and the bottom surface of the molded member.

The first invention is
A first step of molding a rotary body molding member by a mold having a concave-convex pattern on a molding surface;
A second step of separating the rotating body molding member from the mold;
A third step of welding a transparent glaze onto the rotary member molding member;
A fourth step in which the rotary body forming member is rotationally displaced from the position formed in the first step and returned to the mold;
And a fifth step of coating the transparent glaze on the rotating body forming member, which is a method for forming a patterned rotating body formed article.

A second aspect of the present invention is a molded article having an uneven pattern on the molding surface of a rotary body molding member and having a glaze coating on the rotary body molding member, wherein the surface of the glaze coating on the molding member side and the surface on the opposite side thereof. Is a patterned rotating body molded product having the same shape including the above-mentioned concavo-convex pattern but having rotational positions deviated from each other.

According to the present invention, the number of molds is the same as the conventional one, and the molding step is substantially the same as the conventional one, but, for example, the wood grain pattern etc. is three-dimensional due to the unevenness of the glaze and the shading of the coloring, and is extremely wood cutting or craft. It is possible to provide a patterned rotating body molded article which is similar to the above, has a high-grade appearance, and is comfortable to use, and a molding method thereof.

According to the present invention, it is also possible to apply an uneven pattern and glaze coating on all of the side body portion and the bottom portion of the inner surface and the outer surface of the rotating body molded member, and the appearance is much more similar to a wood cutting product than a conventional resin molded product. In addition, it is possible to effectively prevent permeation and contamination of contained items such as curry over the entire molded member due to long-term use.

According to the present invention, it is also possible to provide a patterned rotating body molded article in which a uniform glaze coating can be provided on all the inner and outer surfaces and the bottom surface of the molded member, and a molding method thereof.

(Embodiment 1 of the Invention)
In the first invention, the third step is characterized in that powdery glaze is sprayed on the surface of the rotary body molding member separated from the mold, and the powdery glaze is welded to the rotary body molding member. To do. The welding of the powdery glaze to the molded member in this manner has an advantage that a glaze coating of the same quality can be formed on the entire surface of the molded member. This advantage is that, for example, as shown in FIG. 8 of the cited document 4, a part of the glaze is supplied onto a molded member which is generally cooled to around 150° C. or lower, and the part of the glaze is heated at a high temperature. This is noticeable when compared to the one in which the glaze coating is made under partially different conditions when fed to a mold, which is generally maintained around 150°C.

(Embodiment 2 of the invention)
In the first invention and the second invention, the following modes are mentioned.
The pattern is a wood grain pattern. The wood grain pattern is an appearance that is created by a line arrangement of tree rings, fibers, conduits, medullary lines, etc. that appear on the cut surface of the tree, and an appearance that is similar to this or reminds the general public of this. The grain pattern is one of the most effective ways to carry out the present invention.

The pattern is a brush pattern. The brush pattern is an uneven pattern formed by rubbing the surface of a relatively soft article having a fixed shape with a brush. Examples of the movement of the brush include movement from one point in the radial direction, movement away from one point in a spiral shape, and parallel movement. The brush pattern is another one of the ones that can most effectively carry out the present invention.

It is characterized in that the rotational displacement of the rotary body molding member in the third step is caused by the rotational movement of the rotary body molding member. It is possible to easily and surely perform the important "step of shifting the rotational position from the molded position by the operator" of the present invention without requiring any special processing means or jig.

It is characterized in that the amount of rotational displacement of the rotary member forming member in the third step is smaller than the width of the pattern in the displacement direction in a predetermined region. The pattern due to the unevenness formed on the molding surface is observed without a large change in the external shape, and there can be multiple types of changes in the thickness of the glaze coating, that is, changes in the concentration of the glaze coating. , It is possible to form a wood grain pattern, etc.

The amount of rotational displacement of the rotary member forming member in the third step is 1 to 2 times the width of the pattern in the displacement direction in a predetermined region. The pattern due to the unevenness formed on the molding surface may cause a change in which the appearance feels soft. For example, the width of one grain is observed to be thick while the intervals of the grains forming the grain pattern are constant, and the grain is not clear and the grain is soft.

The material of the molded body of the rotating body is a thermosetting resin. By using a thermosetting resin, the present invention can be carried out most efficiently and reliably.

The thickness of the coating of the transparent glaze is 0.10 mm to 0.01 mm. When the thickness of the glaze coating is more than 0.10 mm, there is a high possibility that the glaze coating will be peeled off or scraped off from the molded member. When the thickness of the glaze coating is less than 0.01 mm, it becomes difficult to see the uneven pattern, that is, the light and shade pattern by the predetermined glaze coating. The thickness of the transparent glaze coating is more preferably 0.08 mm to 0.01 mm.

The concavo-convex pattern of the molding surface is on the side body and the bottom of the inner surface and the outer surface of the rotary member molding member. In the above-mentioned conventional technology, the design foil is attached to the side body portion of the inner and outer surfaces of the rotating body molding member by pressure-bonding heating and welding, but the bottom portion of a complicated shape is designed on the bottom of the thread tail etc. Can not be attached. According to the present invention, it is possible to form a concavo-convex pattern such as wood grain not only on the side trunks of the inner and outer surfaces of the rotary member-forming member but also on the bottom and the like. As a result, the molded product according to the present invention can be made into a molded product having a very similar appearance to wooden tableware and the like by cutting wood.

The transparent glaze is colored and has a transmittance of 5% to 90%. By coloring the transparent glaze, it becomes easier to visually recognize the uneven pattern. When the transmittance of the transparent glaze is lower than 5%, it becomes difficult to visually recognize the uneven pattern. When the transmissivity of the transparent glaze is higher than 90%, the visible state due to the change in the thickness of the glaze coating is less changed, and the appearance of the uneven pattern is simplified. The transmittance of the transparent glaze is preferably 20% to 80%. The transmittance of the transparent glaze is more preferably 25% to 70%.

FIG. 3 is a cross-sectional view of a patterned rotating body molded article according to an example of the present invention. FIG. 3 is a bottom view of a patterned rotating body molded article according to an example of the present invention. It is explanatory drawing of each process of the shaping|molding method of the rotary body molded article with a pattern of the Example of this invention. FIG. 2 is an enlarged view of a portion of the mold corresponding to the portion viewed from the arrow A in FIG. 1. It is an enlarged view of arrow A of FIG. 1 when the molding member is shifted by half the width of the wood grain pattern in the displacement direction in a predetermined region in the fifth step of the molding method shown in FIG. FIG. 6 is a cross-sectional explanatory view taken along the line VI-VI of FIG. 5. It is an enlarged view of arrow A of FIG. 1 when the molding member is displaced by 1.5 times the width in the displacement direction of the wood pattern in the predetermined region in the fifth step of the molding method shown in FIG. FIG. 9 is an explanatory cross-sectional view taken along the line VIII-VIII of FIG. 5.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the patterned rotating body molded product 10 to be molded in this embodiment is a tableware in the shape of a rotating body, for example, a bowl, and the thread tail formed concentrically on the bottom portion. 12 and a mark 14 formed of a concentric circle provided at the center of the bottom.

The molding method of the molded product 10 is as follows. First, as a first step, as shown in FIG. 3A, the lower mold 20 and the upper mold 22 are separated, and the molding material M, which is a thermoplastic resin, is placed in the center of the lower mold 20. Place. Details of the shapes of the lower mold 20 and the upper mold 22 will be described later.

As a second step, as shown in FIG. 3B, the molding material M is compression-molded by bringing the lower mold 20 and the upper mold 22 close to each other. At this time, the lower mold 20 and the upper mold 22 are heated to about 150°C.

As a third step, as shown in FIG. 3C, the lower mold 20 and the upper mold 22 are separated. Further, the molded molding material M, that is, the molding member 30, is separated from the lower mold 20 or the upper mold 22 to which it is attached.

As the fourth step, as shown in FIG. 3D, powdery glaze G is sprayed on the upper surface of the molding member 30, that is, the outer surface of the bowl. At this time, the molded member 30 is cooled below about 150° C., but is maintained at a high temperature at which the glaze G is welded. Further, as shown in FIG. 3E, the molding member 30 is turned upside down and the powdery glaze G is sprayed on the upper surface of the molding member 30, that is, the inner surface of the bowl. This glaze G is also welded to the molding member 30.

As the fifth step, as shown in FIG. 3(f), the molding member 30 is turned upside down, that is, the same state as when the molding material M is molded, but when the molding member 30 is molded in the second step. It is rotated by a predetermined angle with respect to the position and is displaced to be arranged between the lower mold 20 and the upper mold 22. Then, the molding member 30 is brought closer to the surface again, and the glaze G is glaze coated on the outer surface.

The molding surfaces of the lower mold 20 and the upper mold 22 will be described below. As shown in a partially enlarged view of FIG. 4, a portion of the upper mold 22 that molds a region indicated by an arrow A in FIG. 1 has a plurality of convex portions 42 (or concave portions) arranged in a line with respect to the rough molding surface 40. ) Forms a wood grain pattern. The wood grain pattern can be replaced with a brush grain pattern or other patterns.

Using the lower mold 20 and the upper mold 22 having such molding surfaces, the molding member 30 is rotated by a predetermined angle in the fifth step, that is, the amount of rotational displacement of the molding member 30 in the fifth step is When the fifth step is performed so as to be half of the maximum width of the wood grain pattern in the displacement direction in the predetermined region, as shown in FIG. 5, the convex portion 50 of the glaze G formed in the second step and the The concave portion 52 of the glaze G formed in the fifth step is formed.

Assuming that the height of the convex portion 42 is 0.03 mm, the cross section of the glaze G along the line VI-VI of FIG. 5 has the thickest convex portion of the glaze G of 0.07 mm as shown in FIG. A portion 60 in which 50 and a portion without the concave portion 52 overlap, a portion 62 in which the convex portion 50 and the concave portion 52 of the glaze G overlap, which is the second largest thickness 0.04 mm, and a second thick thickness 0.04 mm The portion 64 of the glaze G having no protrusion 50 and the portion having no recess 52 overlap each other, and the portion of the glaze G having the smallest thickness of 0.01 mm having no protrusion 50 overlaps the recess 52. Portion 66 is formed. A pattern such as a grain of the molded product 10 is formed by the portions 60, 62, 64, 66.

Next, using the lower mold 20 and the upper mold 22 having the above-mentioned molding surface, the molding member 30 is rotated in an angle different from the above-mentioned angle in the fifth step, that is, the molding member 30 in the fifth step. When the fifth step is performed so that the amount of rotational displacement of the object becomes 1.5 times the maximum width of the wood grain pattern in the deviation direction in a predetermined region, as shown in FIG. 7, it is formed in the second step. The raised portion 70 of the glaze G and the depressed portion 72 of the glaze G formed in the fifth step are formed.

Assuming that the height of the convex portion 70 is 0.03 mm, the cross section of the glaze G along the line VIII-VIII in FIG. 7 has the thickest convex portion of the glaze G of 0.07 mm as shown in FIG. 70 and a portion without the concave portion 72, a portion 80 where the convex portion 70 of the glaze G having the second largest thickness 0.04 mm and the portion without the concave portion 72 overlap, and the thinnest portion 80. A portion 86 of the glaze G having a thickness of 0.01 mm where the convex portion 70 does not exist and the concave portion 72 overlap is formed. A pattern such as a grain of the molded product 10 is formed by the portions 80, 82 and 86.

In the molded body of the rotating body according to the present invention, it is an advantage that the pattern due to the unevenness and the color can be provided not only on the side body portion of the inner surface and outer surface of the molded article but also on the bottom portion and the like. However, it is also included in the present invention that the pattern of irregularities and colors is partially provided on the outer surface of the molded product, such as only the entire inner surface of the molded product, only the side body part, or only a part of the side body part.

In the embodiment, the plurality of convex portions 42 (or concave portions) of the first lower mold 20X, the first upper mold 22X, the second lower mold 20Y, and the second upper mold 22Y have a substantially rectangular cross section. Although depicted, this is an example. As a matter of course, the cross section may be any shape as long as it can form irregularities such as a trapezoid and a mountain shape.

M Molding material G Glaze 10 Rotating molded article with pattern 12 Thread tail 20 Lower mold 22 Upper mold 30 Molding member 42 Convex part (or concave part)
50 Convex part of glaze 52 Concave part of glaze 70 Convex part of glaze 72 Concave part of glaze

Claims (21)

A first step of molding a rotary body molding member by a mold having a concave-convex pattern on a molding surface;
A second step of separating the rotating body molding member from the mold;
A third step of welding a transparent glaze onto the rotary member molding member;
A fourth step in which the rotary body forming member is rotationally displaced from the position formed in the first step and returned to the mold;
A method for forming a patterned rotating body molded article, comprising: a step of coating the transparent glaze on the rotating body molding member; and a fifth step. The third step, the claims by spraying powdered glaze on the surface of the rotating body formed shape member separated from said mold, characterized in that fusing the powdery glaze to the rotary body formed shape member 1. The molding method according to 1. The molding method according to claim 1, wherein the pattern is a wood grain pattern. The molding method according to claim 1, wherein the pattern is a brush pattern. Molding method according to claim 1, the rotational position displacement of the rotary body forming member of the fourth step is characterized by being made by the rotational movement of the rotary body formed shape member. The molding method according to claim 5, wherein an amount of rotational position deviation of the rotary member forming member in the fourth step is smaller than a width of the pattern in a deviation direction in a predetermined region. The molding method according to claim 5, wherein the amount of rotational position deviation of the rotary member forming member in the fourth step is 1 to 2 times the width of the pattern in the deviation direction in a predetermined region. The molding method according to claim 1, wherein the material of the rotary molded article is a thermosetting resin. The molding method according to claim 1, wherein the coating thickness of the transparent glaze is 0.10 mm to 0.01 mm. The molding method according to claim 1, wherein the concavo-convex pattern on the molding surface is on the side body portion and the bottom portion of the inner surface and the outer surface of the rotating body molding member. The molding method according to claim 1, wherein the transparent glaze is colored and has a transmittance of 5% to 90%. It has an uneven pattern on the molding surface of the rotary body forming member, a molded article having a coating of transparent glaze on the rotating body forming member, the surface and the opposite side of the formed shape member side of the transparent glaze coating The surfaces of (1) and (2) have the same shape including the uneven pattern, but their rotational positions are mutually deviated from each other. The patterned rotating body molded article according to claim 12, wherein the pattern is a grain pattern. The patterned rotating body molded article according to claim 12, wherein the pattern is a brush pattern. 13. The patterned rotating body molded article according to claim 12, wherein the amount of the rotational displacement is smaller than the width of the pattern in the displacement direction. The patterned rotating body molded product according to claim 12, wherein the amount of the rotational displacement is 1 to 2 times the width of the pattern in the displacement direction. The rotational position displacement of the rotary body forming member, patterned rotator molded article according to claim 12, characterized in that it is made by the rotational movement of the rotary body formed shape member. The patterned rotating body molded article according to claim 12, wherein the material of the rotating body molded article is a thermosetting resin. The patterned rotating body molded product according to claim 12, wherein the transparent glaze coating has a thickness of 0.10 mm to 0.01 mm. 13. The patterned rotating body molded product according to claim 12, wherein the unevenness pattern of the molding surface is on the side body portion and the bottom portion of the inner surface and the outer surface of the rotating body molding member. The patterned rotating body molded article according to claim 12, wherein the transparent glaze is colored and the transmittance thereof is 5% to 90%.

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