JPH0714402B2 - Thermoplastic material melting device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a thermoplastic material melting apparatus, particularly a thermoplastic material melting apparatus which is useful for use in build-up molding of dental wax or melt application of a hot melt adhesive. .

<Conventional Technology> A conventional technology will be described by taking a wax build-up forming operation in a dental technique as an example. Generally, when a technician builds up melted wax on the crown forming part of the working model, first heats the spatula to soften or melt the solid wax and scoop it.
The process of reheating and turning it into a liquid, and then raising it to the molded part is usually repeated ten or more times per tooth. Conventionally, every time this work is performed, the viewpoint of the technician is deviated from the part to be molded, so that the work cannot be concentrated and the work is extremely inefficient.

In order to deal with such a problem, the inventor of the present invention has previously disclosed
The structure disclosed in JP-A-60-24837 was proposed. In such a device, a tapered hollow metal body and a heater for heating the same are attached to the tip of the grip body, and a rod-like wax which is a thermoplastic material inserted in the grip body is heated and melted by this heater and pushed out from the tip of the hollow metal body. It is a thing.

Other examples include those disclosed in Japanese Utility Model Laid-Open No. 52-121994 and those disclosed in JP-A-60-126152 having a pen-shaped structure.

<Problems to be Solved by the Invention> In the conventional apparatus described above, the wax build-up molding work can be performed a plurality of times without removing the viewpoint from the molding target portion.
In order to melt the wax inside the hollow metal body,
There is a fear that the melted wax flows back through the cavity of the grip portion and adheres to the transfer roller and hardens to prevent its rotation, or the cavity is narrowed to hinder the movement of the wax. Therefore, in such a device, the control of the heating temperature,
In other words, provide a temperature gradient that makes the temperature higher toward the tip,
Further, although measures have been taken such as minimizing the gap between the wax and the holding portion cavity, it is not yet perfect.

Further, in the above-mentioned conventional example, the transfer roller provided in the grip portion is operated with a finger to transfer the wax forward, and the amount of the molten wax pushed out is adjusted by the transfer speed.
In general, the amount of wax largely changes depending on the build-up portion of the wax. For example, when pouring the wax around the crown or the occlusal surface, a large amount of wax is required, while a small amount of wax is required for molding work of the cusp. It is quite difficult to adjust the amount of wax in this way only by operating the transfer roller.

The same thing can be said when a rod-shaped hot melt adhesive is used as the thermoplastic material, and in a conventional device such as a gun type melting device, the application of the adhesive to a fine portion can be easily and satisfied. It is difficult to apply in the state. That is, it is impossible to spread the adhesive thinly or apply it linearly while heating.

The present invention has been made in view of such circumstances, and by melting the wax or the hot melt adhesive on the outside of the grip portion, the drawbacks such as backflow of molten wax and clogging are eliminated, and By temporarily retaining a required amount of wax or the like in the molding portion and making the amount thereof visible at the same time, the build-up molding or coating process with the optimum amount of wax or the like is facilitated.

<Means for Solving the Problems> A thermoplastic material melting apparatus according to the present invention is a rod-like member which is supported by the gripping portion and is transferred forward or backward by a transfer means provided in the gripping portion. A thermoplastic material, a contact portion that is fixed to the grip portion, is located outside of the grip portion forward, and has the front end of the thermoplastic material contacted by its forward movement and separated by the backward movement, and a molding portion connected below the contact portion. , A heater for heating the contact portion and the molding portion, and the rod-shaped thermoplastic material is brought into contact with or separated from the contact portion by the advancing or retreating operation of the transfer means to adjust the melting amount. The melted and melted thermoplastic material is caused to flow down to the molding section, and the thermoplastic material is build-up molded or applied in the molding section.

<Operation> As shown in FIG. 1, with the heater 10 heating the contact portion 11 and the dish member 12, which is the molding portion, to about 70 to 80 ° C., the transfer means, that is, the roller 4 is rotated, and a thermoplastic material such as a rod-shaped wax is rotated. 7 is transferred to the front of the grip portion 2 and the tip thereof is brought into contact with the contact portion 11 and melted. The melted wax flows down along the contact portion 11 and stays in the molding portion. The molten wax retained in the molding section is subsequently poured into the processing site.

<Example 1> FIG. 1 shows a case where the thermoplastic material 1 according to the present invention is used for dental wax build-up molding, 2 is a substantially cylindrical grip portion, and the grip rear portion 3 is formed transparently. Has been done. Reference numeral 4 denotes a rubber roller formed on the front portion 5 of the grip portion, which transports the rod-shaped wax 7 inserted into the cavity 6 (FIG. 2) in the grip portion 2. As shown in FIG. 2, a similar rubber roller 8 is provided inside the grip portion front portion 5 so as to face the roller 4.
The wax 7 is elastically sandwiched by the pair of rollers 4 and 8 and is transported forward by its rotation (direction of arrow a).
It can also be moved backward by the reverse rotation. Reference numeral 9 is a wax support tube fixed to the front end of the grip portion front portion 5, 10 is an electric heater such as a ceramic heater fixed to the grip portion front portion 5, and 11 is a contact portion hanging downward from the front end of the heater 10.
The transferred wax 7 contacts. Reference numeral 12 is a streamlined dish member fixed below the contact portion 11 and serves as a wax retention portion and a wax build-up molding portion. In the present example, the contact portion 11 and the dish member 12 are integrally formed, but both may be attachable / detachable with a screw or the like, and the angle of the dish member 12 may be set in an easily usable state. Plate member 12
The contact portion 11 allows the rear tray member 13 and the front tray member 14 to be connected to each other.
A hole 15 is formed at the lower end of the contact portion 11 so as to allow the molten wax to freely flow between both dish members 13 and 14. 16
Is about 0.02 mm wide formed on the bottom of the front dish member 14 or
It has a slit of 0.03 mm, and its tip is formed into a minute ball 17 (sphere of about 0.5 mm to 1.5 mm) like a pen tip. The slit 16 is not always necessary,
This may not be provided. The plate member 12 has a length of about 1.5c.
The width can be about 0.5 cm to 1.0 cm. Contact part 1
1 and the dish member 12 are integrally formed of a metal having good thermal conductivity, for example, copper, brass, nickel-chromium alloy, cobalt-chromium alloy, or the like. Reference numeral 18 denotes a heater protrusion fixed to the upper end of the contact portion 11, which can be used for repairing the tooth neck. However, the heater protrusion 18 is not always necessary. Reference numeral 19 is a code for supplying power to the heater 10.

When using such a device, the roller 4 is rotated with a finger (indicated by an arrow a in FIG. 2) to push the wax 7 forward. In this way, the tip of the wax 7 will contact the heated contact part.
Melts at 11th. After melting the desired amount, the roller 4 is slightly reversely rotated with a finger to separate the tip of the wax 7 from the contact portion 11. The molten wax flows downward through the contact portion 11 and stays in the rear dish member 13. Then the molten wax
It flows through the hole 15 to the front plate member 14 and is used for the build-up forming process. That is, in the case of pouring around the crown, occlusal surface, etc., from the side surface of the front dish member 14, and when processing the surface, in the lower part of the slit 16, further fine work such as molding of the cusp. In case it is done using the tip 17 part of the ball.

<Embodiment 2> FIG. 3 shows another embodiment in which a blower pipe 23 is attached below the wax support pipe 9. This air duct 23
The wax is built up by the dish member 12, and the cold liquor (atmosphere at normal temperature) is applied to the wax which is still in a liquid state, which has the function of rapidly solidifying the wax. The blower pipe 23 passes through the inside of the grip portion 2 and is taken out from the rear end thereof, and is connected to an air pump (not shown). Usually, the wax melted by heating is kept in a molten state for several seconds even after it is heaped up on the molded part. Therefore,
In order to perform a quick work, a conventional technician has rapidly solidified by blowing. As described above, between blasts
By providing 23, the solidification of the molten wax can be performed quickly and easily.

<Example 3> FIGS. 4 and 5 show another example of the build-up forming section.
The front edge of the front plate member 14 is covered with a cover 19, and a hole 20 is
And the front plate member 14 is filled with the felt member 21. 22 is a slit formed on the back surface of the front plate member 14. Even with such a configuration, the same method of use as in the above-described embodiment is possible.

<Fourth Embodiment> FIGS. 6 and 7 show still another embodiment, in which a wax support tube 9 is arranged slightly above the center of the grip portion 2, and a heater 10 and a blower tube 23 are arranged below the wax support tube 9. Is provided.
Reference numeral 12 is a dish member integrally formed on the upper portion of the heater 10 and is formed in a pen tip shape and has a slightly curved partition-shaped contact portion 11. At this contact portion 11, the rear dish member 13 and the front dish member are
14 and the molten wax flows from the rear dish member 13 to the front dish member 14 through the hole 15 provided below the contact portion 11.
It should be noted that the front plate member 14 may be provided with slits as in the above-mentioned example. The heater 10 may have a structure in which a ceramic heater is fitted in a metal pipe integrally formed with the dish member 12.

<Example 5> In the example shown in Fig. 8, a heater is embedded in the contact portion 11, and the contact portion 11 and the connecting portion 24 connected to the grip portion 2 (Figs. 1 and 3) can be removed. It is structured. twenty five
Is a plug made of an insulator provided on the upper surface of the contact portion 11,
A pair of electrodes 26, 26 is provided. Reference numeral 27 is an outlet formed in the connecting portion 24, and electrodes 28, 28 are formed at positions facing the electrodes 26, 26. 29, 29 are the electrodes 28, 28
It is a leader line. The contact portion 11 has a ceramic heater built therein and the outer periphery thereof is covered with a metal, and the wax comes into contact with the position indicated by the broken line circle. Numerals 30, 30 and 30 are grooves carved in the wax contact surface, which serve as a guide action when the molten wax is made to flow downward. Reference numeral 12 is a dish member fixed to the lower end of the contact portion 11 and similar to the above-described example.

In the above-mentioned embodiment, the case of using it in the dental wax build-up molding apparatus has been described. However, if a hot melt adhesive made of a thermoplastic material is formed into a rod shape instead of the wax 7, the adhesive is melt-coated. It can be used as a device. 9 and 10 (A) and (B) show the structures of the contact part 11 and the molding part 31 which are particularly effective when applied to the application of the hot melt adhesive, and FIG. And has a slightly thin tip, which is used when the adhesive is applied in a dot or line shape. Also, FIG. 10 (A)
In the structure shown in (B), the molding part 31 is formed in an inclined spatula shape, and is suitable for applying the adhesive in a strip shape. The broken line in the figure indicates a stick-shaped adhesive.

<Example 6> FIG. 11 shows a pair of legs 32, 33 near the front end of the grip portion 2 of the apparatus 1.
The device 1 is supported by the legs 32 and 33 and the rear end of the grip portion 2 so that the dish member 12 as the molding portion can be held in the air when not in use. Leg 33
Is also used as a blower pipe and is connected to the blower pipe 23. Since the device 1 is usually operated by the right hand, the leg 33 formed by the blower tube is preferably the leg 33 located on the opposite side of the roller 4. With such a structure, the cool air can be blown out from the air blowing hole 34 at the tip of the leg 33, and the cold air can be blown to the molten wax at a close position during use.
This facilitates the rapid solidification operation of the wax.

<Effects of the Invention> According to the present invention, the following effects can be obtained.

Since the heating contact portion where the thermoplastic material comes into contact and melts is formed on the outside of the device such as the gripping portion, the molten thermoplastic material flows back into the gripping portion such as the transfer roller and the roller rotates,
There is no risk of problems such as hindering material transfer.

The thermoplastic material melted at the contact portion flows down along the contact portion and is temporarily retained in the molding portion. Since the amount of this thermoplastic material can be visually recognized, it is possible to operate the roller while observing this amount, and the required amount can be accurately obtained. In the case of a melted thermoplastic material, particularly wax, it is not preferable to leave it in such a melted state because deterioration starts immediately after melting.
According to the present invention, as described above, the required amount of the thermoplastic material can be melted immediately before use, so that such deterioration can be minimized.

Since all the parts to which the molten thermoplastic material adheres are located outside the device, when different kinds of wax or different adhesives are used, it is only necessary to wipe the contact part and the molding part. Easy to switch.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is FIG.
-A sectional view, FIG. 3 is a perspective view of another embodiment, and FIG.
FIG. 5 is a perspective view showing a modified example of the molding part, FIG. 5 is a rear view thereof, FIGS. 6 and 7 are perspective views showing still another embodiment, and FIG. 8 is a further embodiment. Fig. 9 is a perspective view showing the shape of the molding part, Fig. 10 (A) is a perspective view showing another shape of the molding part, and Fig. 10 (B) is Fig. 10 (A). ) Is a sectional view taken along line BB in FIG. 11 and FIG. 11 is a perspective view showing a device having legs. DESCRIPTION OF SYMBOLS 1 ... Thermoplastic material melting device 2 ... Gripping part, 4, 8 ... Roller 7 ... Rod wax, 10 ... Heater 11 ... Contact part, 12 ... Plate member 16, 22 ... Slit

Claims (6)

[Claims] 1. A grip portion, a rod-shaped thermoplastic material which is supported by the grip portion, and is transported forward or backward by a transfer means provided in the grip portion, and the grip portion fixed to the grip portion outside of the grip portion front side. And a front end of the thermoplastic material, the front end of which is in contact with the front end of the thermoplastic material, and the rear end of which is separated from the front end of the thermoplastic material; The rod-shaped thermoplastic material is brought into contact with or separated from the contact portion by the advancing or retreating operation of the transfer means, and the molten thermoplastic material is melted in a state where the melting amount can be adjusted, and the melted thermoplastic material is caused to flow down to the molding portion. A thermoplastic material melting apparatus, characterized in that build-up molding or coating of a thermoplastic material is performed in the molding section. 2. The thermoplastic material melting apparatus according to claim 1, wherein the holding portion has a blower pipe, and the cool air is blown from the blower pipe toward the molding portion. 3. A structure having a pair of legs near the front end of the grip portion and supporting the apparatus by the legs and the rear end of the grip portion so that the molding portion can be held in a floating state. 3. The thermoplastic material melting apparatus according to claim 2, wherein at least one of the legs is configured by the blower pipe, and the cool air is blown out from the tip ends of the legs. 4. The apparatus for melting a thermoplastic material according to claim 1, wherein the molding section has a retention section for temporarily retaining the molten thermoplastic material that has flowed down. 5. The thermoplastic material melting apparatus according to claim 1, wherein the thermoplastic material is a dental wax. 6. The thermoplastic material melting apparatus according to claim 1, wherein the thermoplastic material is a hot melt adhesive.