JP2021053844A - Finger cot and manufacturing method thereof - Google Patents

Abstract

To provide: a finger cot allowing a detailed operation to be performed while preventing adhesion of a sticking object such as adhesive tape; and a manufacturing method thereof.SOLUTION: A finger cot 1 made of silicone comprises a bag-like body part 2 which is formed with a finger insertion port 3 at one end and configured to have thickness of is 0.5 mm or less, with a variation of the thickness to be fall within a range of ±0.05 mm. The finger cot is manufactured by inserting a convex die 5b for press into a concave die 5a for press into which unvulcanized silicone resin compound R is put, and pressurizing and heating the unvulcanized silicone resin compound R, or by ejecting the unvulcanized silicone resin compound R to a cavity 7 of a mold 6 for ejection.SELECTED DRAWING: Figure 4

Description

The present invention relates to a finger cot and a method for manufacturing the same, and more particularly to a finger cot and a method for manufacturing the finger cot, which can perform detailed work while preventing attachment of an adhesive tape or the like.

Adhesive tape, labels, and other attachments may be manually attached to cardboard boxes, packaging, and the like. If this sticking work is performed with bare hands or gloves attached, the sticking material may adhere to the fingers or gloves and interfere with the work. Further, when the sticking material attached to the finger or the glove is peeled off, there is a problem that the original adhesive force of the sticking material is reduced.

In order to solve such a problem, a finger cot made of silicon rubber has been proposed (see Patent Documents 1 and 2). At the time of sticking the sticker, there is also detailed work such as peeling the label from the sticker mount. However, since the conventional finger cot has a large rubber thickness, it is difficult to perform detailed work with the fingertips with the finger cot attached, and there is room for improvement.

Jikkai Sho 54-30524 Utility Model Registration No. 3136663 Gazette

An object of the present invention is to provide a finger cot and a method for manufacturing the same, which can perform detailed work while preventing adhesion of an adhesive tape or the like.

In order to achieve the above object, the finger cot of the present invention is a silicone rubber finger cot having a main body portion in which a finger insertion port is formed at one end, and the thickness of the main body portion is 0.5 mm or less. The thickness variation is ± 0.05 mm.

The method for manufacturing a finger cot of the present invention is the method for manufacturing a finger cot described above, wherein the convex mold for pressing is inserted into a concave mold for pressing into which an unvulcanized silicone resin compound is charged, and the unvulcanized mold is inserted. The finger cot is produced by pressurizing and heating the silicone resin compound of.

Another method for producing a finger cot of the present invention is the method for producing a finger cot described above, wherein the finger cot is produced by injecting an unvulcanized silicone resin compound into the cavity of an injection mold. It is characterized by that.

According to the finger cot of the present invention, by making it made of silicone rubber, it is possible to prevent a sticking object such as an adhesive tape from adhering to the finger cot. Since the thickness of the main body is set to 0.5 mm or less and the variation in the thickness is set to ± 0.05 mm, the movement of the finger wearing the finger cot depends on the rigidity (elasticity) of the finger cot. It becomes difficult to be disturbed. Along with this, it is advantageous to perform detailed work with a fingertip equipped with a finger cot.

According to the method for manufacturing a finger cot of the present invention, by using press molding or injection molding, it is possible to manufacture a finger cot with high productivity while stably securing the above-mentioned specifications of the finger cot.

It is explanatory drawing which illustrates the finger cot of this invention in the front view. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is sectional drawing which enlarges and illustrates the protrusion of the surface of the finger cot of FIG. It is explanatory drawing which illustrates the manufacturing method of the finger cot. It is explanatory drawing which illustrates another manufacturing method of a finger cot.

Hereinafter, the finger cot of the present invention and the method for producing the finger cot of the present invention will be described based on the embodiment shown in the figure.

The embodiment of the finger cot 1 illustrated in FIGS. 1 to 3 has an insertion port 3 into which a finger is inserted, and a main body portion 2 in which the insertion port 3 is formed at one end. The main body 2 is formed in a bag shape that covers the fingers, and the insertion port 3 has an annular shape. A large number of protrusions 4 are scattered in a predetermined range on the fingertip side of the surface of the main body 2.

The finger cot 1 is made of silicone resin. The type of silicone resin differs depending on the molding method. In the case of press molding, a solid silicone resin having a degree of polymerization in the range of 5,000 to 10,000 is preferable, and in injection molding, a liquid silicone resin having a viscosity in the range of 0.5 to 100 Pa · s is preferable. Usually, a silicone rubber can be obtained by blending a cross-linking agent, an inorganic filler, and an arbitrary component with these silicone resins to obtain an unvulcanized silicone resin compound R, and then performing press molding or injection molding.

The main body 2 has a size (shape) that allows a general adult index finger or a specific finger to be in close contact with the body and can be inserted, and the length thereof is, for example, about 4 cm to 5 cm. In this embodiment, the main body 2 has a cylindrical shape with a dome shape on the tip side. The cross-sectional view of the main body 2 is a simple circular shape as illustrated in FIG. 2, and has a non-directional shape.

The thickness t (the portion other than the protrusion 4) of the main body 2 is 0.5 mm or less, more preferably 0.4 mm or less, and further preferably 0.35 mm or less. The lower limit of the thickness t of the main body 2 is, for example, about 0.2 mm in consideration of durability and manufacturability. The variation in thickness t over the entire range of the main body 2 is set to ± 0.05 mm. Therefore, the thickness t is substantially the same at any position of the main body 2. The variation in thickness t is more preferably +0.04 mm, still more preferably ± 0.03 mm. The insertion port 3 is thicker than the main body 2.

The main body 2 is not limited to the shape of this embodiment, and other shapes may be adopted. Although this embodiment does not have a through hole that penetrates the main body 2 in the thickness direction, a through hole may be provided at an appropriate position of the main body 2 for air bleeding (prevention of stuffiness).

When this finger cot 1 is attached to a finger (index finger, etc.) and an object such as an adhesive tape or a label is manually attached to an object such as a cardboard box or a packaging package, the object is attached to the finger cot 1. Does not adhere, so the pasting work can be performed efficiently. Further, even if the adhesive layer of the sticking material comes into contact with the finger cot 1, the adhesive layer is not pulled by the finger cot 1 and the adhesive layer is not destroyed. That is, it is possible to avoid a decrease in the original adhesive force of the pasted object.

Moreover, the finger cot 1 has a body portion 2 having a thickness t of 0.5 mm or less and a thickness t thereof.
Since the variation of the finger cot 1 is set to ± 0.05 mm, the movement of the finger on which the finger cot 1 is attached is less likely to be hindered by the rigidity (elasticity) of the finger cot. Therefore, it is possible to perform detailed work such as peeling the label from the sticker mount or flipping (peeling) the end of the attached adhesive tape with the fingertip on which the finger cot 1 is attached. ..

Since the main body 2 is extremely thin, it is possible to perform detailed work by using the fingernail to which the finger cot 1 is attached. Since the main body 2 is made of silicone rubber, it does not easily tear even when a nail is pressed against it, and has appropriate durability.

The protrusions 4 can be provided arbitrarily, but the presence of the fine protrusions 4 on the surface of the main body 2 provides an anti-slip effect (improvement of grip force), and makes it difficult for adhesive tape, labels, etc. to adhere. The effect is also exhibited. The size of the protrusion 4 in a plan view is preferably in the range of 0.1 mm to 1.5 mm corresponding to the diameter. If the size of the protrusion 4 in a plan view deviates from the range of 0.1 mm to 1.5 mm corresponding to the diameter, the effect of making it difficult for the adhesive tape, the label, or the like to adhere is reduced. Further, the height t1 of the protrusion 4 is preferably 0.1 mm to 0.4 mm. When the height t1 of the protrusion 4 exceeds 0.4 mm, it becomes difficult to perform detailed work with the fingertip on which the finger cot 1 is attached. Further, when the height t1 of the protrusion 4 is less than 0.1 mm, the anti-slip effect (improvement of grip force) by the protrusion 4 is reduced.

The protrusions 4 are scattered and distributed in at least one-third of the region of the main body 2 on the fingertip side, more preferably one-half of the region. The size of each protrusion 4 in a plan view can be the same, but as in this embodiment, protrusions 4 having different sizes can be mixed. However, the height t1 of each protrusion 4 is substantially the same.

Various shapes such as a triangular shape and a semicircular shape can be adopted as the vertical cross-sectional shape of the protrusion 4, but as illustrated in FIG. 3, the protrusion 4 having a flat top is preferable. When such a protrusion 4 is provided on the surface of the main body 2, the pressure at which the protrusion 4 presses the adhesive layer of the attachment is reduced, and the adhesive layer is less likely to be destroyed. Along with this, even if the adhesive layer of the adhesive is touched with the finger cot 1, it is advantageous to prevent the adhesive strength of the adhesive from being lowered.

Methods for manufacturing the finger cot 1 include press molding, injection molding, transfer molding, extrusion molding, calendar molding, coating molding, and dipping molding. Among these manufacturing methods, press molding or injection molding is preferable in that a thin finger cot 1 having a thickness t of the main body 2 of 0.5 mm or less can be easily and continuously obtained.

In the case of press molding, for example, with respect to 100 parts by mass of a solid silicone resin having a degree of polymerization in the range of 5000 to 10000, 0.01 to 10 parts by mass of a cross-linking agent selected from organic peroxides, silica, quartz powder, etc. An unvulcanized silicone resin compound R containing 1 to 200 parts by mass of an inorganic filler selected from alumina and calcium carbonate and 0.01 to 30 parts by mass of an optional additive such as a silica dispersant and a pigment is used. As illustrated in FIG. 4, this unvulcanized silicone resin compound R is used in a press mold 5 having a concave mold 5a for pressing and a convex mold 5b for pressing which is inserted into and assembled into the concave mold 5a. Press mold.

First, as illustrated in FIG. 4A, the convex press 5b is inserted into the concave 5a for pressing into which the unvulcanized silicone resin compound R is charged. Next, as illustrated in FIG. 4B, an unvulcanized silicone resin compound R was applied between the assembled concave 5a and 5b at a press pressure of 10 to 150 kg / cm ² and a temperature of 100 to 200 ° C. Silicone finger cot 1 is produced by pressurizing and heating under the conditions of 0.5 to 30 minutes. After manufacturing the finger cot 1, the convex mold 5b is taken out from the concave mold 5a, and the finger cot 1 is taken out from the press mold 5. The excess silicone rubber attached to the finger cot 1 is deburred with a cutting tool.

As the injection molding, liquid injection molding using a liquid silicone resin is preferable because the silicone resin compound R has a low viscosity at a low pressure and a thin finger cot of 0.5 mm or less can be obtained. In the case of this liquid injection molding, for example, 0.01 to 10 parts of a cross-linking agent or a catalyst selected from platinum compounds or titanium compounds is applied to 100 parts by mass of a liquid silicone resin having a viscosity in the range of 0.5 to 100 Pa · s. Unvulcanized with 1 to 100 parts by mass of an inorganic filler selected from silica, quartz powder, alumina and calcium carbonate and 0.01 to 30 parts by mass of optional additives such as silica dispersant and pigment. Liquid silicone resin compound R is used. As illustrated in FIG. 5, this unvulcanized liquid silicone resin compound R is formed by injection molding using an injection mold 6 having a concave mold 6a and a convex mold 6b inserted into and assembled into the concave mold 6a. A finger cot 1 can also be manufactured.

First, as illustrated in FIG. 5A, the convex shape 6b is inserted into the concave shape 6a and assembled to form a cavity 7 between the two. The nozzle of the plunger 8 is attached to the concave shape 6a. The unvulcanized liquid silicone resin compound R is heated from the plunger 8 and injected into the cavity 7. Next, as illustrated in FIG. 4 (B), the liquid silicone resin compound R injected between the assembled concave mold 5a and the convex mold 5b was subjected to an injection pressure of 40 to 120 kg / cm ² and a temperature of 130 to 200 ° C. The finger cot 1 is manufactured by molding into a predetermined shape under the conditions of time 0.1 to 5 minutes. After manufacturing the finger cot 1, the convex mold 6b is taken out from the concave mold 6a, and the finger cot 1 is taken out from the injection mold 6. The excess silicone rubber attached to the finger cot 1 is deburred with a cutting tool.

Further, the silicone finger cot obtained by press molding or injection molding can be subjected to secondary vulcanization (crosslinking) for the purpose of improving physical properties such as mechanical strength and heat resistance. As an example of secondary vulcanization, a molded silicone finger cot can be placed in a hot air dryer and heat-aged at a temperature of 80 to 200 ° C. and a time of 0.5 to 10 hours to proceed with vulcanization.

When manufacturing a silicone finger cot by so-called dipping molding, which is widely used for finger cots of natural rubber and synthetic rubber, it is necessary to increase the thickness t of the main body 2 in order to obtain a finger cot with excellent strength. Yes, it is difficult to make it 0.5 mm or less. Further, it is difficult to maintain ± 0.05 mm because the silicone resin compound R is sagging due to heating during molding and the thickness t varies widely.

On the other hand, by using the press molding illustrated in FIG. 4 and the injection molding illustrated in FIG. 5, the thickness t of the main body 2 is 0.5 mm or less, and the variation in the thickness t is ± 0.05 mm. The finger cot 1 can be manufactured with high productivity while ensuring stable specifications. Furthermore, by using press molding or injection molding, the thickness t of the main body 2 and the height t1 of the protrusion 4 can be controlled with high accuracy, and the thickness t can be 0.4 mm or less or 0.3 mm or less. It is also possible to make the height of the protrusion 4 0.2 mm or less.

Since the optimum thickness t of the main body 2 differs depending on the application and the operator, it is preferable to manufacture a plurality of types (two or more types, or three or more types) of finger cots 1 having different thicknesses t. In this way, when manufacturing a plurality of types of finger cots 1 in which the thickness t of the main body 2 is set to a different value preset, unvulcanized unvulcanized colored in a different color preset for each thickness t. Silicone resin compound R is used. As a result, a plurality of types of finger cots 1 having different colors for each thickness t are manufactured.

For example, the colors of the finger cots 1 having thicknesses t of 0.4 mm, 0.35 mm, and 0.3 mm are different from each other to make white, orange, light blue, and the like. As a result, the thickness t of the main body 2 of the finger cot 1 can be found only by visually observing the finger cot 1. Therefore, it is very useful for the user of the finger cot 1 because he / she can easily select the finger cot 1 that is most suitable for him / her. It is also extremely useful for those who manage and store a large number of multiple types of finger cots 1.

A silicone resin compound obtained by kneading a milky white translucent solid silicone resin with a degree of polymerization of 7,000, an organic peroxide, high-purity molten silica, and an orange pigment with a mixing roll is placed in a concave die for pressing preheated to 150 ° C. After preheating for 1 minute, a convex die for pressing was inserted from above ^{, and molding was performed with a 100-ton press machine at a pressure of 100 kg / cm 2} and a temperature of 150 ° C. for 10 minutes to obtain a thickness of 0. An orange silicone finger sack of 3 mm was obtained. The thickness variation of the main body of this silicone finger cot is ± 0.02 mm, the size of the protrusion 4 in plan view is in the range of 0.3 to 1.1 mm corresponding to the diameter, and the height of the protrusion is 0.16 to 0.2 mm. The tensile breaking strength was 10 MPa, the breaking elongation was 1200%, and the finger cot was a good finger cot to which cellophane tape did not adhere.

As a silicone resin for liquid injection molding, an unvulcanized silicone resin compound obtained by adding a blue pigment to liquid KE-1950-50A / B (trade name of Shin-Etsu Chemical Industry Co., Ltd.) is used, the mold temperature is 150 ° C., and the injection pressure is 70 kg. Injection molding was performed under the conditions of / cm ^{2 and a curing time of 30 seconds.} After injection molding, secondary vulcanization was carried out at 150 ° C. for 30 minutes in a hot air drying furnace to obtain a blue silicone finger cot having a main body thickness of 0.4 mm. The thickness variation of the main body of this silicone finger cot is ± 0.03 mm, the size of the protrusion in plan view is in the range of 0.4 to 1.2 mm equivalent to the diameter, and the height of the protrusion is 0.2 to 0.3 mm. It was in the range, the tensile breaking strength was 9.5 MPa, the breaking elongation was 700%, and it was a good finger cot to which cellophane tape did not adhere.

1 Finger cot 2 Main body 3 Insertion port 4 Protrusion 5 Press mold 5a Press concave 5b Press convex 6 Injection mold 6a Concave 6b Convex 7 Cavity 8 Plunger R Unvulcanized silicone resin compound

Claims (7)

In a silicone rubber finger cot having a main body with a finger insertion slot formed at one end,
A finger cot characterized in that the thickness of the main body is 0.5 mm or less and the thickness variation is ± 0.05 mm. The finger cot according to claim 1, wherein a large number of protrusions are scattered in a predetermined range on the fingertip side of the surface of the main body, and the height of the protrusions is 0.1 mm to 0.4 mm. The finger cot according to claim 2, wherein the top of the protrusion is flat. The finger cot according to claim 2 or 3, wherein the size of the protrusion in a plan view is equivalent to a diameter of 0.1 mm to 1.5 mm. The method for manufacturing a finger cot according to any one of claims 1 to 4.
Manufacture of a finger cot that manufactures the finger cot by inserting a convex mold for pressing into a concave mold for pressing into which an unvulcanized silicone resin compound is charged and pressurizing and heating the unvulcanized silicone resin compound. Method. The method for manufacturing a finger cot according to any one of claims 1 to 4.
A method for manufacturing a finger cot, which manufactures the finger cot by injecting an unvulcanized silicone resin compound into the cavity of an injection mold. When manufacturing a plurality of types of finger cots having different thicknesses preset, the unvulcanized silicone resin compound colored in different colors preset for each thickness is used. The method for manufacturing a finger cot according to claim 5 or 6, wherein a plurality of types of finger cots having different colors for each thickness are manufactured.

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