JP2624875B2 - Heating box for denture base molding - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heating box used for molding a denture base using a thermoplastic resin.

[Related Art] In recent years, a method using an engineering plastic having excellent mechanical strength and safety as a denture base material has been developed. Examples thereof include a polycarbonate denture base and a polysulfone denture base formed by injection molding. However, the injection molding method requires an expensive injection molding machine for forming a denture base.

On the other hand, using an inexpensive compression molding machine, as a method of simply forming a denture base of a thermoplastic resin, after softening a preform similar to the denture base to be manufactured on a lower gypsum mold,
Methods for compression molding are known.

As an apparatus in such a compression molding method, Japanese Utility Model 59
Japanese Patent No. 57919 discloses a denture base manufacturing apparatus that combines a constant temperature chamber for heating and softening a thermoplastic resin, a guide for moving a lower gypsum mold to below a gypsum upper mold, and a compression molding machine.

[Problem to be Solved by the Invention] However, in this apparatus, although a constant temperature chamber for heating and softening the thermoplastic resin is disclosed, a specific configuration of the constant temperature chamber is not illustrated. That is, in the above apparatus, there is no specific description about the arrangement, shape, and the like of the heater for heating the gypsum upper mold and the gypsum lower mold in the constant temperature chamber.

[Means for Solving the Problems] In view of the above situation, the present inventor has studied the arrangement and shape of the heaters for more effectively heating each of the gypsum upper mold and the gypsum lower mold, and as a result, The inventors have found that a heating box in which the arrangement and shape of a heater is specified is effective, and have reached the present invention.

That is, according to the present invention, the lower chamber is composed of an upper chamber and a lower chamber, and the lower chamber is for softening a thermoplastic resin preform placed on a gypsum lower mold, and has a cross-sectional shape of the preform. A far-infrared heater is provided so as to substantially correspond to the shape of the foam, and the upper chamber is defined by a heating plate using a far-infrared heater provided in the lower chamber as a heat source for the constant temperature of the gypsum upper mold, A heating box for forming a denture base, wherein the heating plate includes far-infrared ray generating means is provided.

[Function] As described above, the heating box of the present invention has a two-chamber structure of an upper chamber and a lower chamber, and the far-infrared ray generating means provided for each of the two chambers is appropriately used for heating the gypsum upper mold and the gypsum lower mold. Since they are arranged, the thermoplastic resin preform can be uniformly heated and softened as a whole.

Further, in the present invention, the far-infrared heater provided in the lower chamber is used as one heat source, thereby giving a temperature difference and simultaneously heating and softening the thermoplastic resin preform on the gypsum lower mold. The heating plate provided with the far-infrared ray generating means in the room is heated, whereby the heating plate generates far-infrared rays and the gypsum upper mold can be maintained at a predetermined temperature.

When molding the denture base, the ambient temperature of the plaster upper mold in which the artificial teeth on the upper chamber side are buried in the heating box is set to a temperature of about 130 ° C. so that the artificial teeth do not thermally deform, and the lower plaster lower mold on the lower chamber side The ambient temperature is set to about 380 at which the preform softens during molding of the thermoplastic preform placed on the gypsum lower mold.
It is necessary to adjust the upper and lower atmosphere temperatures of the gypsum mold to different temperatures, such as a temperature of ° C.

For this reason, between the gypsum upper mold and the lower side set in the denture base press unit, a far-infrared ray generating heating plate for gypsum upper heat retention, and a far-infrared heater for gypsum lower thermoplastic resin preform heating, respectively After the heating boxes of the present invention arranged in the upper chamber and the lower chamber are charged and the gypsum upper mold and the gypsum lower mold are heated to the predetermined temperatures as described above, and the thermoplastic resin preform is heated and softened, the heating box is dentured. It can be removed from the floor press and then compression molded.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to the illustrated examples, but the present invention is not limited to these examples.

FIG. 1 is a sectional view showing an example of a heating box for forming a denture base according to the present invention, in which (a) is a left half front sectional view and a right half front view, and (b) is a right side view (partial sectional view). It is.

FIG. 2 is a schematic diagram showing an example of a denture base forming press device.

Reference numeral 1 denotes a heating box main body, a far infrared heater mounting plate 2 is fixed to the main body 1, and a far infrared heater 3 is mounted on the mounting plate 2 to form a lower chamber A. Reference numeral 6 denotes a front plate. Here, the far-infrared heater mounting plate 2 and the far-infrared heater 3 are shaped into a thermoplastic resin preform 13 placed on a gypsum lower mold 12 when the heating box 10 is inserted into the denture base press zone 11. Almost compatible, plaster lower mold 12
Is attached and formed so as to cover from above. Further, the far-infrared heater 3 is composed of a nichrome wire heater and a far-infrared ray generating substance applied on the surface thereof. As the far-infrared ray generating substance, for example, Tyranno Coat (trade name of Ube Industries, Ltd.) can be used. A heat insulating material 5 is provided between the mounting plate 2 and the far infrared heater 3 for heat insulation.

On the other hand, above the far infrared heater mounting plate 2, a heating plate 4
When the heating box 10 is inserted into the denture base press zone 11, the plaster upper mold 14 is formed so as to surround the plaster upper mold 14 from below, and forms the upper chamber B. The surface of the heating plate 4 is coated with Tyrano (a trademark of Ube Industries, Ltd.) which is a far-infrared ray generating substance.

Since the heating box 10 is formed as described above,
When the heating box 10 is inserted into the denture base press zone 11, in the lower chamber A, the far infrared heater 3 heats the ambient temperature to about 380 ° C., and the shape of the far infrared heater 3 is lower chamber A. Since the preform 13 substantially corresponds to the shape of the preform 13 placed on the gypsum lower mold 12, the preform 13 is uniformly heated and softened as a whole.

Further, the far infrared heater 3 provided in the lower chamber A is a gypsum lower mold.
The thermoplastic resin preform 13 on the substrate 12 is heated and softened at about 380 ° C., and also serves as a heat source of the heating plate 4 coated with the far-infrared ray generating substance in the upper chamber B, whereby the heating plate 4 generates far-infrared rays. The upper gypsum mold 14 can be maintained at about 130 ° C.

The far-infrared heater 3 has a densely arranged nichrome wire heater on the front side (left side in FIG. 1B) in consideration of heat radiation to the outside, and has a rear side (FIG. 1 ( b)
It is more preferable to make the arrangement of the nichrome wire heater sparse in order to uniformly heat and soften the entire preform 13.

As shown in FIG. 2, the heating box 10 of the present invention is provided with a driving device 15 comprising an air cylinder when forming a denture base.
Is inserted into the press zone 11 via the connecting mechanism 16 and, before compression molding, the gypsum upper mold 14 and the gypsum lower mold 12
Is heated to soften the thermoplastic resin preform 13 placed on the gypsum lower mold 12 by heating. After the heating and softening is completed, the drive unit 15 moves to the right side in the figure via the connecting mechanism 16 and retreats from the press zone 11. Reference numeral 17 denotes a driving device for raising the gypsum lower mold 12 in the direction of the gypsum upper mold 14 and pressing the same.

[Effect of the Invention] As described above, the heating box for denture base molding of the present invention specifies the arrangement and shape of the far-infrared heater,
The thermoplastic resin preform can be uniformly heated and softened as a whole. In addition, the far-infrared heater provided in the lower chamber is used as one heat source, and by this, a temperature difference is given to heat the thermoplastic resin preform on the gypsum lower mold and heat the heating plate to perform the isothermal action of the gypsum upper mold. It is very economical to do.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a heating box for forming a denture base according to the present invention, in which (a) is a left half front sectional view and a right half front view, and (b) is a right side view (partial sectional view). It is. FIG. 2 is a schematic diagram showing an example of a denture base forming press device. DESCRIPTION OF SYMBOLS 1 ... Heating box main body, 2 ... Far infrared heater mounting plate, 3 ... Far infrared heater, A ... Lower room, B ... Upper room, 4 ... Heating plate, 5 ... Heat insulating material, 6 ... Front plate, 10 ...
Heating box, 11 ... denture base press zone, 12: gypsum lower mold, 13 ... thermoplastic resin preform, 14 ... gypsum upper mold, 15 ... drive device, 16 ... coupling mechanism, 17 ... drive apparatus.

Claims (1)

(57) [Claims] 1. A lower chamber for softening a thermoplastic resin preform placed on a gypsum lower mold, wherein the lower chamber has a sectional shape of the preform. A far-infrared heater is provided so as to substantially correspond to the above, and the upper chamber is defined by a heating plate having a far-infrared heater provided as a heat source provided in the lower chamber for the constant temperature of the gypsum upper mold. A heating box for forming a denture base, comprising a far-infrared ray generating means.