GB2148094A

GB2148094A - Plastic gloves and form for making same

Info

Publication number: GB2148094A
Application number: GB08425364A
Authority: GB
Inventors: Takayuki Iioka
Original assignee: REITEKKU JOINT STOCK Co
Current assignee: REITEKKU JOINT STOCK Co
Priority date: 1983-10-22
Filing date: 1984-10-08
Publication date: 1985-05-30
Also published as: GB2148094B; GB8425364D0; MY102830A; JPS6088544A

Abstract

Plastic gloves are made by dipping a hand-shaped form (10) which comprises an index finger portion (1), a middle finger portion (2), a third finger portion and a little finger portion (4), each defining a curved line extending from the knuckle portion to the fingertip portion with an angle of curvature alpha of from 35 DEG to 90 DEG . Preferably there is an included angle phi 1 of less than 90 DEG between the tangent A1-A1' touching the curved line at the fingertip portion and the tangent B1-B1' touching on the back side surface of the hand portion. The gloves do not disturb the natural behaviour of human fingers and so do not make a human hand tired. <IMAGE>

Description

SPECIFICATION Plastic Gloves and Form for Making Same The present invention relates to the manufacture of such plastic gloves, as are commonly called "rubber gloves", which comprise a plastics film of emulsion latex, paste-resin or the like, and which may be worn for kitchen work, dirty work, medical treatment and the like.

Conventionally, such gloves are formed by dipping a hand-shaped form into a liquid compound containing natural rubber latex, butadiene-styrene- rubber latex, acrylonitril-butadiene-rubber latex, chlornprene-rnbb.er latex, polyurethane-rubber latex, vinyl-chloride emuision, vinyl-chloride plastisol or the like, and subsequently raising it therefrom to form a plastic film over its surface.

The hand-shaped form is shaped so that the rubber glove thus formed resembles a usual textile glove.

That is, in a conventional hand-shaped form, each finger portion and a thumb portion are straight and extend from a hand portion, and a rubber glove is formed in accordance with the appearance of this hand-shaped form.

However, in a human hand, in its natural relaxed or working position, each finger and the thumb, especially the fingers, define a curve toward the palm side of the hand. It is only momentarily when preparing to grip that the fingers and thumb are straight.

Therefore, it disturbs natural behaviour of a finger or a thumb to wear a conventional rubber glove.

Furthermore, it is tiresome and dulls one's tactile sense to wear such a rubber glove, because the film of a rubber glove is highly elastic so that the fingers and thumb are pulled to the back side and their palm side surface wrinkles when gripping.

According to the prior art disclosed in Japanese Utility Model Publication No. 52-50895, on the back side surface of a glove, there is formed many grooves or corrugations running from the wrist portion to the fingertip portion in orderto decrease the elasticity of rubber film and tiredness resulting therefrom. However, the glove fits on a hand uncomfortably and easily pulls away from a hand, since the surface area of the glove becomes larger than that of hand. Thus, this prior known glove does not solve the aforementioned problems.

Furthermore, in the process of glove making by using the hand-shaped form according to this prior art, the rubber film at a finger root portion becomes thinner than that of other portions, which is a drawback since liquid compound over the surface of the form tends to easily flow down at such a finger root portion when the form is raised after dipping, and rubber film moves downwardly and forms a so called "duck's web" between each adjacent finger root portion.

In this connection, according to prior art disclosed in Japanese Utility Model Publication No. 45-5089 and Japanese Patent Publication No. 47-28220, the side surface of a finger portion of a hand-shaped form is formed to be rough, so that the rubber film of such a side portion should not become thinner.

But, it is not effective to prevent such a "duck's web".

That is, there occurs the problem of "duck's web", even if the hand-shaped form is covered with a knitted glove when it is dipped into the liquid compound, even though the side surface of finger portion is rough and a glove backed with the knitted fabric is to be produced.

One object of this invention is to provide rubber gloves which in use do not produce tiredness resulting from the elasticity of the rubber film, and also do not dull tactile sense. Tiredness and tactile sense have an influence upon medical treatment which entails delicate hand work.

Therefore, another object of this invention is to provide useful rubber gloves for use by a surgeon.

According to the present invention, there is provided a hand-shaped form, each finger portion of which defines a curve extending palmward from a knuckle portion to a fingertip portion, with an angle of curvature of between 35 and 90". The invention also provides a glove which is formed on said hand-shaped form. That is, each finger portion of a rubber glove, according to this invention, defines a curve extending palmward from a knuckle portion to a fingertip portion with an angle of curvature of between 35 and 90". This form of a glove is similar to that of a human hand in its natural relaxed position.

Thus, this glove does not disturb natural behaviour of a human finger to bend toward the palm side during a resting time, and it does not tend to make a human hand tired.

Additionally, this glove does not disturb the gripping movement of a human fingerto bend more closely toward the palm side, and it does not tend to make one's tactile sense dull. Furthermore a force to grip an object spreads perfectly for it to be gripped, since any bending strain which may occur on the finger portion of the glove is smaller, and thus the wrinkles are less, in comparison with prior known gloves.

Furthermore, as each finger portion does not define an extreme curve, that is, as the angle of curvature is less than 90 , the rubber film on the palm side of the finger portion does not pull the fingers toward the palm side, and it does not disturb the natural behaviour of the fingers to be straight when momentarily opening and extending.

However, it may be expected that this rubber glove should not be easily removed from the hand-shaped form at a removal time.

In this connection, the included angle, which is that between the tangent touching at the fingertip portion on the curved line running along the palm side surface of the finger from the knuckle toward the fingertip and the tangent touching on the back side surface of hand portion, is less than 90". And, this tangent touching on the back side surface is inclined toward the back side. That is, as each fingertip of the hand-shaped form does not extend at right angles to a central axis of an arm portion of the form, but extends slightly inclined towards the upper end of such central axis, it becomes possible to remove rubber glove film from the hand-shaped form.

As mentioned above, this invention provides useful rubber gloves.

Moreover, according to the described embodiment of the present invention, the problems of "duck's web" does not occur in the glove making process, thus rubber gloves are produced effectively.

Further objects and advantages of the present invention will be apparent from the following description of one embodiment illustrated in the accompanying drawings, in which: Figure 1 is an elevation of the hand-shaped form, Figure 2 is a rear elevation of the hand-shaped form shown in Figure 1, Figure 3 is a left side elevation of the hand-shaped form shown in Figure 1, Figure 4 is a right side elevation of the handshaped form shown in Figure 1, Figure 5 is a sectional side view along the lines P-P of Figure 2, Figure 6 is a sectional side view along the lines R-R of Figure 2, Figure 7 is a sectional side view along the lines Q-Q of Figure 2, Figure 8 is a sectional plan view along the lines S--S of Figure 1, and Figure 9 is a side view partly in section of a glove of this invention.

There are shown the forms referred to as 10, and numerals 1,2,3,4,5,6 and 7 respectively designate an index finger portion, a middle finger portion, a third finger portion, a little finger portion, a thumb portion, a hand portion and an arm portion respectively of the form 10.

The form 10 may be made of porcelain and there is provided a cavity on its inside. Other materials such as wood, glass ceramics or metal, preferably aluminium, may be used to form the form 10.

As can be seen in the sectional view (Figure 8), the thumb portion 5 is of generally circular section and the finger portions are of generally rounded rectangular section lengthened in the palm to back direction. Each space "a" between adjacent finger portions 1, 2, 3 and 4 is of 5 to 10 mm atthe root portion near the knuckle portion, and gradually becomes the wider nearer to the fingertip portion.

Each finger portion 1,2,3 and 4, as viewed from the side, defines the palmwardly curved line extending from the knuckle portion to the fingertip portion.

Reference characters 01, 02, 03 and 04 respectively designate inscribed circles touching from the knuckle portion toward the fingertip portion along the palm side surface of the finger portions 1,2,3 and 4.

Thus, approximately it is possibie to represent the angle of curvature of each finger portion with the radius and the central included angle between the points of contact of the fingertip portion and the knuckle portion respectively with these inscribed circles.

Reference characters a, ss, T and respectively designate the central angles of the index finger portion, the middle finger portion, the third finger portion and the little finger portion. Reference characters R1, R2, R3 and R4 respectively designate the radii of these finger portions.

In consideration of glove size and compound property, these central angles and radii preferably lie within the ranges described as follows: As to the index finger portion, a=35-85" and R1=60-80mm.

As to the middle finger portion, P=40--90" and R2=50--70mm.

As to the third finger portion, y=40--90" and R3=45-75mm. and As to the little finger portion, 6=35-90" and R4=40--80mm.

Preferably, these angles of curvature have to be decided within the range described as follows: a=60+59 P=75+54 y=75+5 , o=65+5 Now, the range "+5 " means the elaboration of forming and measuring a rubber glove or a handshaped form.

From the experiments with the forming process and with wearing tests of many kind of gloves in which the angles of curvature were varied, it has been found that a useful glove is formed when these angles of curvature are as follows: a=60 , ss=75 , y=75" and o=65 , The radius of curvature of each finger portion is decided in accordance with the size of the glove, and more particularly with the length of the finger portion thereof.

In a glove for an adult man, for example, these radii may be generally as follows: R1=70+5mm, R2=60+5mm, R3=60+5mm, R4=50+mm.

Additionally, it is desirable that the upper portion of the hand portion 6 adjacent each knuckle defines the palmwardly curved line with an angle of curvature (o) of 47+5 extending from the side of the index finger portion to the side of the little finger portion, and in the gloves for an adult man, the radius of the curvature R0 of the curved line or inscribed circle 0 is preferably 72+5mm.

Reference characters A1--A1 ', A2-A2', A3--A3' and A4-A4' respectively designate the tangent touching at the fingertip portion on the inscribed circles 01, 02, 03 and 04 respectively of the index finger portion 1, the middle finger portion 2, the third finger portion 3 and the little finger portion 4.

Reference character B1--B1' designates the tangent touching on the middle portion of the back side surface, of which middle portion is located in a line extending in the same direction as the index finger portion 1.

Reference character B2--B2' designates the tangent touching on the middle portion of the back side surface, of which middle portion is located in a line extending in the same direction as the middle finger portion 2.

Reference character B3--B3' designates the tangent touching on the middle portion of the back side surface, of which middle portion is located in a line extending in the same direction as the third finger portion 3 and, Reference character B4--B4' designates the tangent touching on the middle portion of the back side surfaces, of which middle portion is located in a line extending in the same direction as the little finger portion 4.

These tangents are inclined toward the back side with the included angle of 5-15" in respect to the central axis 0--0' of the arm portion.

The abovementioned curvature of the index finger portion 1, the middle finger portion 2, the third finger portion 3 and the little finger portion 4 are so that the included angles 2, 3 and (p4, which are respectively included between the tangents A1--A1' and B1B1 ', the tangents A2A2' and B2-B2', the tangents A3--A3' and B3B3', and the tangents A4--A4' and B4--B4', are respectively less than 90 .

Thus, the inclination p1, p2, p3 and p4, of which angles are respectively included between the central axis 0--0' and the tangent Al-Al' of the index finger portion 1, the tangent A2-A2' of the middle finger portion 2, the tangent A3--A3' of the third finger portion 3 and the tangent A4--A4' of the little finger portion 4, are less than 85 , since p=q.

If these inclinations are greater than 90 , it becomes very difficult to strip the rubber glove from the hand-shaped form, since the removal action is performed by stripping the rubber glove in the direction parallel with the central axis 0--0'.

Thus, the inclination (p=85") must be understood to mean the maximum angle with which the finger portion 1,2,3 and 4 may be inclined in respect to the central axis OO', Accordingly, it is desirable that these inclinations lie within the range 50-70" by providing these angle within 8--10", and having these angles of curvature of each finger portion within the abovementioned desirable range (60-75").

It is to be noted that the greater the inclination sp of the back side surface with respect to the central axis 0--0', the less the inclination p of the finger portion relative to the central axis 0--0'.

However, it is not preferable for the inclination ç to be too great, lest the glove formed by using such a hand-shaped form makes the back portion of a human hand uncomfortable because of a tension tending to pull the hand toward the back side.

The recesses 21,22 and 23 which define a parabola-shaped curve as viewed from the side, are formed between adjacent finger portions 1, 2,3 and 4 and over the upper edge of the hand portion. The radius of the back side segment of this parabolashaped curve is at least one and a half times as long as that of the palm side segment.

The frequency of occurring of "ducks web", in the process of glove making by using such a handshaped form on which the recesses are formed in the manner mentioned above, is unexpectedly decreased. And this decreasing tendency comes into being apparently when the greater the radius of the back side segment and the further the back side segment extends toward the back side surface.

Thus this effect resulting from the recess apparently depends upon the fact that each finger portion defines the curve and the length and inclination of the palm side segment of the recesses are different from those of the back side, hence, liquid compound over the surface of the form flows down in different manner on the palm side from on the back side, and even if such a flowing of liquid compound begins to form a film of a "duck's web", the surface tension pulls the film irregularly, and then such surface tension breaks the film.

In the form 10 to form gloves for an adult man, the recesses are so formed that the radii Rl 1, R21 and R31 of the back side segments are at least 25 mm, and are at least one and a half times the radii R12, R22 and R32 of the palm side segments.

The product according to this invention is not limited by the configuration of the thumb portion 5.

However, it is desirable to form the thumb portion 5 to define a curve toward the palm side of the form with an angle of curvature of 0=50+5 and a radius of curvature of R5=52+5mm.

Reference character 05 designates the inscribed circle touching along the palm side surface of the root portion of the thumb portion 5. The rubber glove 30 according to this invention, is formed as a film which is formed over the surface of handshaped form 10 by dipping it into liquid compound and raising it from the liquid compound. Thus, the form of the rubber glove 30 is similar to the appearance of abovementioned hand-shaped form.

In the case of rubber gloves 30, each angle of curvature g of the curve of the palm side surface of finger portions 1', 2', 3' and 4', has to be measured by inflating with air without expanding the rubber film of the glove, and simultaneously closing the mouth 31.

This invention may be still applied to the forming of a rubber glove 30 having a textured interior surface, by covering the hand-shaped form 10 with a knitted glove 32, dipping it into liquid compound, and then forming a rubber film over the outer surface of the knitted glove 32. Thus, to use such a base cloth as knitted glove does not limit the technical scope of this invention, nor disturb the products which result from this invention.

The embodiment of this invention is explained as follows: (1) As to the hand-shaped form; the hand-shaped form 10 is formed as shown in Figures 18. That is, the hand-shaped form according to this embodiment is illustrated, to a reduced scale, in Figures 1-8, thus the angle of curvature of the finger portion and the included angle between the tangents are shown so as to be similarto those occurring in iife.

The form 10 may be made of porcelain, and on its inside there is provided a cavity.

The angle of curvature a of the index finger portion 1 is 60 and the radius of curvature R1 is 70mm.

The angle of curvature ss of the middle finger portion 2 is 72" and the radius of curvature R2 is 52mm.

The angle of curvature y of the third finger portion 2 is 74" and the radius of curvature R3 is 60mm.

The angle of curvature 5 of the little finger portion 4 is 63" and the radius of curvature R4 is 50mm.

And the angle of curvature 6 of the thumb portion 5 is 45" and the radius of curvature R5 is 45mm.

The angle of curvatures of the curve between the index finger portion 1 and the little finger portion 4 is 49" and the radius R0 of that curve is 75mm.

The tangent B1--B1' touching the middle portion of the back side surface, of which middle portion is located in a line extending in the same direction as the index finger portion 1, The tangent B2-B2' touching the middle portion of the back side surface, of which middle portion is located in a line extending in the same direction as the middle finger portion 2, The tangent B3-B3' touching the middle portion of the back side surface, of which middle portion is located a line extending in the same direction as the third finger portion 3, and The tangent B4-B4' touching the middle portion of the back side surface, of which middle portion is located in a line extending in the same direction as the little finger portion 4, are respectively inclined toward the back side with the included angle of 9" in respect to the central axis 0-0'.

The included angle 1, between the tangent B1--B1' and the tangent A1--A1' to the inscribed circle 01 touching along the index finger portion 1 at the fingertip portion, is 59 , and the included angle pl, between the tangent B1--B1' and the central axis 0-0', is 50".

The included angle 2, between the tangent B2-B2' and the tangent A2-A2' to the inscribed circle 02 touching along the middle finger portion 2 at the fingertip portion, is 79 , and the included angle p2, between the tangent B2-B2' and the central axis 0--0', is 70".

The included angle 3, between the tangent B3--B3' and the tangent A3-A3' to the inscribed circle 03 touching along the third finger portion 3 at the fingertip portion 59". and the included angle p3, between the tangent B3-B3' and the central axis 0--0', is 50". And, the included angle 4, between the tangent B4-B4' and the tangent A4--A4' to the inscribed circle 04 touching along the little finger portion 4 at the fingertip portion is 64 , and the included angle p4, between the tangent B4-B4' and the central axis 0--0', is 55 .

The radii Rl 1, R21, and R31, of the back side segments of recesses 21,22 and 23 respectively existing between adjacent finger portions 1,2,3 and 4, are each 34mm.

And the radii R12, R22 and R32, of the palm side segments of those recesses, are each 13mm.

Each space "a" between adjacent finger portions 1,2,3 and 4 is 7mm at the root portion and gradually becomes wider towards the fingertip portion.

(2) As to the liquid compound; Liquid compound to form the rubber glove is formulated as follows, by adjusting the viscosity to be 300 c.p.s.

Parts by Material net weight Natural rubber latex (Solid 60%) 100.0 Potassium hydroxide 0.2 Sodium polyacrylic acid 0.2 Potassium oleate 0.1 Sulfur 1.0 Zinc oxide 1.0 Zinc diethyl dithio carbamate 0.8 Carbon black 3.0 Total 106.3

(3) As to the process: The hand-shaped form 10 is covered with the knitted glove 32 of which the thickness if 0.8mm, the knitted course density is 13 courses per inch, and knitted weal density is 14 weals per inch.

In the next step, the form is dipped into the above-mentioned liquid compound by positioning the fingertip portion downward, so that at the fingertip portion is dipped first, and by moving it down art a speed of 1 Omm per second.

Subsequently, the form is raised from the liquid compound at a speed of 5mm per second, and is dried at a temperature of 60"C for 2 minutes.

After repeating such a dipping and drying action three times, liquid compound which adheres to the surface of the knitted glove 32 covering the form 10 is cured at a temperature of 110"C for 30 minutes, and there results a rubber film thickness of 0.2mm.

In this process, a "duck's web" is not formed during the raising steps.

In the next step, rubber film which forms the rubber glove 30 is removed by fixedly clamping the arm portion 7 of the form 10 between a pair of sponges, of a thickness of 10cm, having a rough surface, and by pulling toward the fingertip portion.

Thus, the rubber glove 30 having a textured interior surface is formed. This rubber glove 30 is similar in appearance to the hand-shaped form 10 but in use one does not feed tiredness and thus the glove is very useful.

Claims

1. In a method of forming plastic gloves by dipping a hand-shaped form into a liquid compound and raising it therefrom to form a plastic film over its surface, a hand-shaped form comprising: an index finger portion, a middle finger portion, a third finger portion and a little finger portion respectively defining a curved line extending palmward from a knuckle portion to a fingertip portion with an angle of curvature of between 35e and 90".

2. A hand-shaped form as claimed in claim 1 having an included angle of less than 90" between a tangent touching at the fingertip portion on a curved line running along the palm side surface of a finger portion extending from the knuckle portion toward the fingertip portion and the tangent touching on the back side surface of the hand portion, and said back side surface inclined towards the back side in respect to a central axis of an arm portion of said form.

3. A hand-shaped form as claimed in claim 2, comprising an index finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion toward the fingertip portion, the palmside surface defines a curve with a radius of 70~80mum and an angle of curvature of 35-85", and in the manner that the tangent of said palmwardly curved line touching atthefingertip portion is inclined towards the palm side in respect to the central axis of the arm portion with an inclination angle of less than 85", a middle finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion toward the fingertip portion, the palmside surface defines a curve with a radius of 50~70mum and an angle of curvature of 40~90 , and in the manner that the tangent of said palmwardly curved line touching at the fingertip portion is inclined towards the palm side in respect to the central axis of the arm portion with an inclination edge angle of less than 85 , a third finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion toward the fingertip portion, the palmside surface defines a curve with a radius of 45~75mum and an angle of curvature of 40-90", and in the manner that the tangent of said palmwardiy curved line touching at the fingertip portion is inclined towards the palm side in respect to the central axis of the arm portion with an inclination angle of less than 85", a little finger portion which defines the palmwardly curved line in the manner that from the knuckle portion toward the fingertip portion, the palmside surface defines a curve with a radius of 40~80mum and an angle of curvature of 35-90", and in the manner that the tangent of said palmwardly curved line touching at the fingertip portion is inclined towards the palm side in respect to the central axis of the arm portion with an inclination angle of less than 85 , the upper portion of the hand portion which is adjacent each knuckle portion of the finger portion defines, from the side of the index finger portion towards the side of the little finger portion, the palmwardly curved line, said hand portion of which a back side surface is inclined towards the back side in respect to the central axis of the arm portion with an inclination angle of greater than 0 , recesses, of which bottom sides define a parabola-shaped curved as viewed from their side, being formed between adjacent finger portions, and the radii of the back side segments of said parabola-shaped curves are longer than that of palm side segments, and a thumb portion which defines a curve towards the palm side.

4. A hand-shaped form as claimed in claim 3, comprising an index finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion toward the fingertip portion, the palmside surface defines a curve with a radius of 70+5mm and an angle of curvature of 60+5 , and in the manner that the tangent of said palmwardly curved line touching at the fingertip portion is inclined towards the palm side in respect to the central axis of the arm portion with an inclination angle of 50-70", a middle finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion toward the fingertip portion, the palmside surface defines a curve with a radius of 60+5mm and an angle of curvature of 75+54 and in the manner that the tangent of said palmwardly curved line touching at the fingertip portion is inclined towards the palm side in respect to the central axis of the arm portion with an inclination angle of 50-70", a third finger portion which defines the palmwardiy curved line in the manner that, from the knuckle portion toward the fingertip portion, the palmside surface defines a curve with a radius of 60+5mm and an angle of curvature of 75+5 , and in the manner that the tangent of said palmwardly curved line touching at the fingertip portion is inclined towards the palm side in respect to the central axis of the arm portion with an inclination angle of 50-70", a little finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion toward the fingertip portion, the palmside surface defines a curve with a radius of 50+5mum and an angle of curvature of 65+5 , and in the manner that the tangent of said palmwardly curved line touching at the fingertip portion is inclined towards the palm side in respect to the central axis of the arm portion with an inclination angle of 50-70", an upper portion of the hand portion which is adjacent each knuckle portion of the finger portion defining, from said side of the index finger portion towards the side of the little finger portion, the palmwardly curved line with a radius of curvature of 725mm and with an angle of curvature of 47+5 , said hand portion of which back side surface is inclined towards the back side in respect to the central axis of the arm portion with an inclination angle of 5-15", recesses, of which bottom sides define the parabola-shaped curves as viewed from their side, being formed between adjacent finger portions, and the radii of the back side segments of said parabola-shaped curves are at least one and a half times those of the palm side segments, and a thumb portion which defines a curve towards the palm side in the manner that, from the knuckle portion towards the fingertip portion, the palmside surface defines a curve with a radius of 52+5mm and an angle of curvature of 50+so.

5. Plastic gloves of which outer surface are of plastics material film comprising; an index finger portion, a middle finger portion, a third finger portion and a little finger portion each respectively defining a curved line extending palmward from the knuckle portion to the fingertip portion thereof with an angle of curvature within the range of 35 to 900.

6. Plastic gloves as claimed in claim 5 comprising; an index finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion towards the fingertip portion, the palmside surface defines a curve with a radius of 70~80mum and an angle of curvature of 35-85", and in the manner that the tangent of said palmwardly curved line touching atthefingertip portion is inclined towards the palm side with an inclination angle of less than 90 with respect to the tangent touching on the middle portion of the back side surface of the hand portion of which the middle portion is located in the line extending in the same direction as the index finger portion, a middle finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion towards the fingertip portion, the palmside surface defines a curve with a radius of 50~70mum and an angle of curvature of 40-909 and in the manner that the tangent of said palmwardly curved line touching at the fingertip portion, is inclined towards the palm side with an inclination angle of less than 90 with respect to the tangent touching on the middie portion of the back side surface of the hand portion, of which the middle portion is located in the line extending in the same direction as the index finger portion, a third finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion towards the fingertip portion, the palmside surface defines the curve with a radius of 45~75mum and an angle of curvature of 40~90 , and in the manner that the tangent of said palmwardly curved line touching atthefingertip portion is inclined towards the palm side with an inclination angle of less than 90" with respect to the tangent touching on the middle portion of the back side surface of the hand portion, of which the middle portion is located in the line extending in the same direction as the index finger portion, a little finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion towards the fingertip portion, the palmside surface defines a curve with a radius of 40~80mum and an angle of curvature of 35-90", and in the mannerthatthe tangent of said palmwardly curved line touching at the fingertip portion is inclined towards the palm side with an inclination angle of less than 90" with respect to the tangent touching on the middle portion of the back side surface of the hand portion of which the middle portion is located in the line extending in the same direction as the index finger portion, an upper portion of the hand portion which is adjacent each knuckle portion of the finger portion defines, from the side of the index finger portion towards the side of the little finger portion, the palmwardly curved line, and a thumb portion which defines the curve towards the palm side.

7. Plastic gloves as claimed in claim 6 comprising; an index finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion towards the fingertip portion, the palmside surface defines a curve with a radius of 70t5mm and an angle of curvature of 60fib, and in the manner that the tangent of said palmwardly curved line touching at the fingertip portion is inclined towards the palm side with an inclination angle of 50-85" with respect to the tangent touching on the middle portion of the back side surface of the hand portion, of which the middle portion is located in the line extending in the same direction as the index finger portion, a middle finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion towards the fingertip portion, the palmside surface defines a curve with a radius of 60~5mum and an angle of curvature of 75+54 and in the manner that the tangent of said palmwardly curved line touching at the fingertip portion is inclined towards the palm side with an inclination angle of 50-85" with respect to the tangent touching on the middle portion of the back side surface of the hand portion, of which the middle portion is located on the line extending in the same direction as the index finger portion, a third finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion towards the fingertip portion, the palmside surface defines a curve with a radius of 60~5mum and an angle of curvature of 75f 59 and in the manner that the tangent of said palmwardly curved line touching at the fingertip portion is inclined towards the palm side with an inclination angle of 50~85 with respect to the tangent touching on the middle portion of the back side surface of the hand portion, of which the middle portion is located in the line extending in the same direction as the index finger portion, a little finger portion which defines the palmwardly curved line in the manner that, from the knuckle portion towards the fingertip portion, the palmside surface defines a curve with a radius of 50+5mm and an angle of curvature of 65~5 , and in the manner that the tangent of said palmwardly curved line touching at the fingertip portion is inclined towards the palm side with an inclination angle of 50-85" with respect to the tangent touching on the middle portion of the back side surface of the hand portion, of which the middle portion is located in the line extending in the same direction as the index finger portion, an upper portion of the hand portion which is adjacent each knuckle portion of the finger portion and defines, from the side of the index finger portion towards the side of the little finger portion, the palmwardly curved line with a radius of curvature of 72+5mum and with an angle of curvature of 475", and a thumb portion which defines the curve toward the palm side in the manner that, from the knuckle portion towards the fingertip portion, the palm side surface defines a curve with a radius of 52+Smm and an angle of curvature of 50f 5".