JPH09543A - Dental cement kneading board set - Google Patents

Abstract

PURPOSE: To provide enough adhesive strength via application of simple constitution, and prevent occurrence of a wrinkle on a kneading board even at the time of exposure to a strong force by spreading a hot melt adhesive layer on the top side and one of right and left sides of a box type kneading board polymer formed out of a plurality of stacked rectangular waterresistant kneading boards. CONSTITUTION: A dental cement kneading board set 1 is formed out of stacked rectangular waterproof kneading boards 2 of synthetic paper mainly composed of polypropylene. Also, sponge type back sheets 3 of polyurethane having the same size as the boards 2 are attached to the bottom of the set 1, thereby forming a box type kneading board polymer 10, and a hot melt adhesive mainly composed of a rosin is, for example, applied to the top side 7 and the right side 9 of the polymer 10 via a roller. Then, the adhesive is cooled and solidified at ordinary temperature to spread adhesive layers 6 and 7. As a result, enough adhesive strength can be provided, and the boards 2 are not displaced from each other to such an extent as forming a wrinkle, even when a strong force acts in any direction on the uppermost surface thereof, due to dental cement strongly kneaded thereon by the use of a knife.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a kneading board set used for kneading dental cement immediately before use.

[0002]

2. Description of the Related Art Since dental cement is filled in the mouth, it is kneaded with a spatula on a paper-like kneading board which is clean from the viewpoint of hygiene. In that case, the kneading paperboard is made into a memo pad form by stacking a plurality of rectangular water-resistant kneading paperboards so as to be frequently used, and is formed into a kneading paperboard set. The side surfaces in the vertical direction as viewed from above the kneading board set will be referred to as “top and bottom”, and the left and right side surfaces will be described as “left and right”. For example, in FIG. 3, the dental cement pasteboard set 1 has a length of 10
100 sheets of rectangular white synthetic paper kneading paperboard 2 consisting mainly of polypropylene of 5 mm × width 75 mm × thickness 95 μ are stacked, and a polyurethane sponge-like backing sheet of the same size as the kneading paperboard 2 and a thickness of 2 mm is placed on the lower bottom. 3 is provided to form a box-shaped kneading paperboard polymer 10, and an adhesive mainly composed of polyvinyl acetate dissolved in an organic solvent is applied to the top side surface 7, left side surface 8 and right side surface 9 of the kneading paperboard polymer 10. Paper applied with a brush and left to dry for 2 hours to spread the adhesive layers 13, 12 and 12, respectively, and spread over the adhesive layer 13 on the top side surface 7 and the bottom and top surfaces of the kneading paperboard polymer 10. It is made by attaching the back tape 4 of cross tape. Immediately before use, dental cement is kneaded right and left by the spatula on the outermost kneading paperboard set of the dental cement kneading paperboard set in a memo pad, so strong force is applied to the kneading paperboard or the spatula is directly kneaded. The kneading paperboard on the outermost surface of the paperboard hits the surface of the paperboard and forms wrinkles. As a result, the kneading paperboard is not smoothly kneaded, and the kneading paperboard on the next page in use is often affected. As a measure against this,
The box-shaped kneading paperboard polymer of the kneading paperboard set can be held by spreading a solvent-based adhesive with a brush on the kneading paperboard polymer, or by heating the kneading paperboard polymer in a streak pattern from the front surface to the back surface. It has been practiced to set the sheet and set it by a spatula so as to prevent the kneading of the kneading paperboard from occurring.

[0003]

In the above-mentioned conventional kneading paperboard set, the adhesive strength is insufficient even when solvent-based adhesive is spread on both left and right sides, and the adhesive in the kneading paperboard is Adhesion is insufficient and it is impossible to completely prevent the paperboard from slipping. Further, a kneading paperboard set in which both the left and right sides are heated and set in a streak shape has a high manufacturing cost, is poor in appearance, and is not popular. The present invention, a sufficient adhesive strength can be obtained with a simple structure, the dental cement is strongly kneaded in the horizontal direction on the outermost kneading paperboard by a spatula, and strong wrinkles are generated on the kneading paperboard even if strong force is applied. It is an object of the present invention to obtain a dental cement kneading paperboard set which can be efficiently kneaded without causing any occurrence.

[0004]

In order to achieve the above-mentioned object, the present invention provides a box-shaped kneading paperboard polymer by stacking a plurality of rectangular water-resistant kneading paperboards according to claim 1. The problem was solved by a dental cement kneading paperboard set in which a hot melt adhesive layer was spread on at least one of the top side surface and the right and left side surfaces of the kneading paperboard polymer. According to a second aspect of the present invention, in the dental cement kneading board set according to the first aspect, a tape-like backing is spread over the adhesive layer on the side surface of the top and the lower and upper surfaces of the kneading paperboard polymer. It can be a worn dental cement pasteboard set. According to a third aspect of the present invention, in the dental cement kneading paperboard set according to any one of the first to second aspects, at least a back sponge-like back sheet is provided on the lower bottom of the kneading paperboard polymer. It is preferably a paperboard set. According to claim 4, claim 1
In the dental cement kneading paperboard set described in any of 3, it is preferable that the dental cement kneading paperboard set has a cover of a surface protection sheet material provided on the upper surface of the kneading paperboard polymer.

The water-resistant kneaded paperboard in the present invention is preferably synthetic paper from the viewpoint of strength, water resistance and dimensional stability. For example, polypropylene, polyvinyl chloride, polyester, polyethylene or polystyrene or the like or a natural fiber mainly composed of them. Mixed white paper is usually used. The dimensions of the kneading board are not particularly limited, but for example, length 103 mm, 1
05 mm x width 70 mm, 75 mm, 77 mm x thickness 80
80 sheets, 100 in combination of μ, 95μ, 110μ
A set of 120 sheets, etc. The hot melt adhesive layer in the present invention is made of polyvinyl acetate as a main material.
Viscosity of polyvinyl butyral, acrylic resin, polyisobutylene polyamide, thermoplastic resins such as copolymers of ethylene and vinyl acetate or acrylate, terpene resins, rosin derivatives such as pine resin, and natural resins such as natural rubber At room temperature, solid hot-melt adhesives containing modifiers, additives, etc. are melted by heating to form a sticky fluid paste and spread on at least one of the top side surface and the left and right side surfaces of the kneading paperboard polymer. Then, it is obtained by cooling and solidifying at room temperature for a short time of seconds. The tape-like backing used in the present invention is mainly selected selectively from the viewpoint of appearance, but normal paper, paper cloth, cloth and the like are used.
The backing sheet used in the present invention is for slip prevention,
The material is not particularly limited as long as it is a sponge having at least a large back surface friction coefficient, but various plastic foams, particularly urethane foam, are inexpensive and preferable. The cover sheet of the surface protective sheet material in the present invention is selectively adopted in terms of preventing stains and appearance, and the material is not particularly limited, but, for example, a plastic sheet, a cardboard or the like is used. Sufficient adhesive force can be obtained only by spreading the hot melt adhesive layer on at least one of the top side surface and the left and right side surfaces of the kneading paperboard polymer in the present invention, but the hot melt adhesive layer is spread on the left and right side surfaces. Of course you can. However, there are usually many right-handed people, so in many cases they are spread only on the top and right sides.

[0006]

According to the dental cement kneading paperboard set of the present invention, sufficient adhesion can be obtained even by spreading the hot melt adhesive layer on at least one of the top side surface and the right and left side surfaces of the kneading paperboard polymer. On the outermost kneading paperboard, the dental cement is strongly kneaded to the left and right with a spatula, and even when a strong force is applied to the kneading paperboard, the kneading can be efficiently performed without causing wrinkles. By using a hot melt adhesive, the adhesive in the manufacturing process of the dental cement kneading paperboard set of the present invention is heated and melted to form an adhesive fluid paste, and at least the top side surface and the left and right side surfaces of the kneading paperboard polymer. After spreading on one side, it can be solidified by cooling and solidifying at room temperature, and at the same time, the adhesion can be completed, and a stronger adhesive layer can be obtained in a shorter time than an adhesive dissolved in a solvent.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an example of a dental cement pasteboard set according to the present invention, and is (a) a front view, (b) a top side view, (c) left side view, and (d) right side view. 2A and 2B show another example of the dental cement kneading paperboard set of the present invention, and are (a) front view, (b) top side view, (c) left side view, and (d) right side view. FIG. 3 shows an example of a conventional dental cement pasteboard set, (a) front view, (b) top side view,
(C) Left side view, (d) Right side view.

In FIG. 1, a dental cement kneading board set 1 is a rectangular white synthetic paper water-resistant kneading board 2 (Oji Yuka Synthetic Paper Co., Ltd.), which is mainly composed of polypropylene having a length of 103 mm, a width of 70 mm, and a thickness of 110 μ. 80 pieces of Yippan YUPO) are piled up, and the same size as the kneading board 2 on the bottom is 2 mm thick.
A box-shaped kneading paperboard polymer 10 is prepared by arranging the polyurethane sponge-like backing sheet 3 of the kneading paperboard polymer 10 on the top side 7 and the right side 9 and melted at 170 ° C. After applying a hot melt adhesive (Asahi Melt K690 manufactured by Asahi Chemical Synthetic Co., Ltd.) as a main component through a roller,
It has a structure in which the adhesive layers 6 and 5 are spread by cooling and solidifying at room temperature for 3 seconds.

In FIG. 2, a dental cement pasteboard set 1 is a rectangular white synthetic paper water-resistant pasteboard 2 (Oji Yuka Synthetic Paper Co., Ltd.), which is mainly composed of polypropylene having a length of 105 mm × width of 75 mm × thickness of 95 μ. Made Ippan Yupo) 1
Stacked 00 sheets, the same size as the kneading board 2 on the bottom
Box-shaped with a polyurethane sponge-like backing sheet 3 and a nylon sheet cover sheet 11 (made by Sekisui Molding Co., Ltd.) of the same size as the kneading paperboard 2 and a thickness of 1 mm on the upper surface. As a kneading paperboard polymer 10, a hot melt adhesive mainly composed of pine resin melted at 170 ° C. on the top side 7 and the right side 9 of the kneading paperboard polymer 10 (Asahi Melt manufactured by Asahi Chemical Synthetic Co., Ltd. K690) is applied through a roller,
After being cooled and solidified at room temperature for 3 seconds, the adhesive layers 6 and 5 are spread, and the backing tape 4 of the paper cloth tape that extends over the adhesive layer 6 on the top side surface 7 and the lower bottom and upper surface of the kneading paperboard polymer 10 is applied. It is the wearing structure. The hot melt adhesive used in the examples shown in FIGS. 1 and 2 is in the form of a molten paste at 160 ° C. to 180 ° C.
Below 170 ° C, the fluidity is insufficient, and above 180 ° C, discoloration occurs, so around 170 ° C is most preferable. This temperature is selected and determined depending on the type of hot melt adhesive used.

When the same dental cement is strongly kneaded in the horizontal direction with a spatula on the outermost kneading paperboard of the dental cement kneading paperboard set shown in FIGS. In the cement cement board set for use, 10 pieces are wrinkled and wrinkled in the middle, whereas in the dental cement board set of the present invention shown in FIGS. 1 and 2, 80 pieces and 100 pieces, respectively. No wrinkles or wrinkles were formed on the way to the end.

[0011]

According to the dental cement kneading paperboard set of the present invention, sufficient adhesion can be obtained even by spreading the hot melt adhesive layer on at least one of the top side surface and the left and right side surfaces of the kneading paperboard polymer. The dental cement is strongly kneaded on the outermost surface of the kneading board with a spatula in the horizontal direction, and even if a strong force is applied to the kneading board, no wrinkles are generated and the dental cement is kneaded efficiently. Can be done well. Also, by using a hot melt adhesive, the adhesive in the manufacturing process of the dental cement kneading paperboard set of the present invention is heated and melted to form an adhesive fluid paste, and the top side surface and the left and right side surfaces of the kneading paperboard polymer. After spreading on at least one of them, the adhesive can be completed at the same time as it is cooled and solidified at room temperature, and a stronger adhesive layer can be obtained in a shorter time than the adhesive dissolved in a solvent.

[Brief description of drawings]

FIG. 1 is a view showing an example of a dental cement pasteboard set according to the present invention, wherein (a) is a front view, (b) is a top side view, (c) is a left side view, and (d) is a right side view.

FIG. 2 shows another example of the dental cement kneading paperboard set of the present invention, and is (a) a front view, (b) a top side view, (c) left side view, and (d) right side view.

FIG. 3 shows an example of a conventional dental cement pasteboard set, which is (a) a front view, (b) a top side view, (c) a left side view, and (d) a right side view.

[Explanation of symbols]

 1 Dental cement pasteboard set 2 Pasteboard 3 Back sheet 4 Backing 5,6 Adhesive layer 7 Top side 8 Left side 9 Right side 10 Rasterboard polymer 11 Cover 12, 13 Adhesive

Claims (4)

[Claims] 1. A box-shaped kneading paperboard polymer is obtained by stacking a plurality of rectangular water-resistant kneading paperboards, and a hot melt adhesive layer is spread on at least one of the top side surface and the left and right side surfaces of the kneading paperboard polymer. Dental cement pasteboard set characterized by being worn. 2. The dental cement kneading paperboard set according to claim 1, wherein a tape-like backing is spread over the adhesive layer on the side of the top and the lower and upper surfaces of the kneading paperboard polymer. Dental cement pasteboard set characterized by. 3. The dental cement kneading paperboard set according to any one of claims 1 and 2, wherein at least a back side sponge-like backing sheet is provided on the lower bottom of the kneading paperboard polymer. Cement pasteboard set. 4. The dental cement kneading paperboard set according to any one of claims 1 to 3, wherein a cover of a surface protective sheet material is provided on the upper surface of the kneading paperboard polymer. Knead board set.