JPH04242675A - Uniform of ice hockey player - Google Patents

Abstract

PURPOSE:To provide a uniform for an ice hockey player which is light weighted, excellent in strength, creep-resistance, weather resistance, wear-resistance and hurt-prevention and holds moderate flexibility. CONSTITUTION:The uniform in the title is formed by a knit cloth mainly composed of molecular orientation forming body of ultrahigh molecular weight ethylene series polymer, the limiting viscosity of which is at least 5d/g. By using the above specified knit clith, it is possible to provide a uniform for an ice hockey player which is light weighted, excellent in hurt-prevention and holds moderate flexibility. The uniform for an ice hockey player is hardly damaged by collision and falling caused by violet motions peculiar to an ice hockey or violent contact with a skate blade, stick, pack and so on, so that it is favorably used as a uniform having very high safety.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to uniforms for ice hockey players, and more specifically, the present invention relates to uniforms for ice hockey players.More specifically, the present invention relates to uniforms for ice hockey players. This invention relates to a uniform for ice hockey players that is extremely unlikely to tear and has excellent cut resistance.

0002

[Prior art and its problems] Ice hockey, which is known as a particularly violent sport, involves not only collisions between players, but also collisions with fences and falls, and each time a skate blade or stick is used. ,
It is also an extremely extreme sport that involves intense contact with objects such as the puck. Therefore, in order to protect themselves from these dangers, athletes must wear a helmet on their head and cover the rest of their body with their own protector.
He wears a uniform over it. This uniform is woven from high-strength fibers such as nylon, polyester, Kevlar, or polypropylene in order to withstand the violent collisions and falls mentioned above.
Even so, uniforms made from these materials inevitably tear when they come into strong contact with skate blades, sticks, etc.

0003

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to provide a uniform that exhibits excellent cut resistance against any impact during ice hockey games.

0004

[Means for Solving the Problems] The present invention has been proposed to achieve the above-mentioned object. It features a uniform. That is, according to the present invention, there is provided an ice hockey player's uniform made of a knitted fabric mainly composed of a molecularly oriented molded product of an ultra-high molecular weight ethylene polymer having an intrinsic viscosity [η] of at least 5 dl/g. Ru. Further, according to the present invention, the ultra-high molecular weight ethylene polymer contains ethylene and α-olefin containing an average of 0.1 to 20 α-olefins having 3 or more carbon atoms per 1000 carbon atoms.
Copolymers of olefins, especially ethylene and copolymers in which the α-olefin is one or more selected from the group consisting of butene-1, 4-methylpentene-1, hexene-1 and decene-1. When an α-olefin copolymer is used, an ice hockey player's uniform with even better cut resistance is provided.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The uniform for ice hockey players according to the present invention has an intrinsic viscosity [η] of at least 5 dl/g, preferably from 6 to 30 dl/g, as measured in a decalin solvent at 135°C. It consists of a knitted fabric mainly composed of a molecularly oriented molded product of a high molecular weight ethylene polymer.

Ultra-high molecular weight ethylene polymers include not only ultra-high molecular weight polyethylene but also ethylene and α-olefins having 3 or more carbon atoms, such as propylene, butene-1, pentene, etc. -1,
4-methylpentene-1, hexene-1, heptene-1
Copolymers with one or more selected from the group consisting of octene-1, octene-1, and decene-1 are mentioned, among which copolymers with ethylene, butene-1, 4-methylpentene-1, hexene-1 1. A copolymer with one or more selected from the group consisting of octene-1 and decene-1 not only has excellent cut resistance, but also has excellent abrasion resistance, creep resistance, and high strength. and is suitably used for the purpose of the present invention. Furthermore, when the ultra-high molecular weight ethylene polymer is a copolymer of ethylene and an α-olefin, the α-olefin comonomer has 1 carbon number.
The content is preferably 0.1 to 20 on average, preferably 0.5 to 10 on average per 1,000 pieces. When the content of the α-olefin comonomer in the copolymer is within the above range, the α-olefin component forms an intermolecular entanglement structure that is effective in achieving high breaking energy, and this structure improves cut resistance. The uniform for ice hockey players, which is a knitted fabric mainly composed of the molecularly oriented molded product, has excellent cut resistance despite being made of a thin material.

Ultra-high molecular weight ethylene α-
Quantification of α-olefin component in olefin copolymer is as follows:
The measurement was performed using an infrared spectrophotometer (manufactured by JASCO Corporation). In other words, the absorbance at 1378 cm-1, which represents the bending vibration of the methyl group of the α-olefin incorporated into the ethylene chain, is measured, and from this the absorbance is measured using a 13C nuclear magnetic resonance apparatus in advance on a test line created using a model compound. It was calculated from the measured value by converting it into the number of methyl branches per 1000 carbon atoms.

Intrinsic viscosity of ultra-high molecular weight ethylene polymer [
If [η] is less than 5 dl/g, even if the stretching ratio is increased, a molecularly oriented molded product with sufficient strength cannot be obtained; The melt viscosity is extremely high, melt fractures etc. occur during extrusion, and the melt spinnability is poor, making it impossible to obtain a suitable multifilament.

[0009] The material of the uniform of the present invention is mainly composed of drawn yarns of the ultra-high molecular weight ethylene polymer. A multifilament made of filament or ciliary yarn, which is a bulky yarn obtained by controlling the fiber distribution of each part of the constituent fibers, may be used. When knitting and weaving uniforms in the present invention, the multifilament usually has a density of 50 to 2000.
A denier, especially one of about 150 to 1000 denier is used. In addition, the multifilament of the molecularly oriented molded product of the ultra-high molecular weight ethylene polymer used in the present invention has a tensile strength of at least 1.5 GPa or more,
The elastic modulus is 20 GPa or more.

[0010] The uniform of the present invention can, of course, be entirely knitted or woven from the molecularly oriented molded product of the ultra-high molecular weight ethylene polymer, but in order to improve the ease of slipping of the uniform, especially the jacket, it is preferable to knit it by 50% or less. Blend fabrics with nylon and/or polyester may also be used. At this time, nylon and/or polyester may be used only in one direction of the uniform structure, but may also be used in both the vertical and horizontal directions. Alternatively, a core spun yarn may be used, in which the core is a drawn yarn of a molecularly oriented molded product of an ultra-high molecular weight ethylene polymer, and a spun yarn of nylon or polyester is wound around the outer surface of the drawn yarn. In either case, the result is a uniform for ice hockey players that has excellent cut resistance. Uniforms knitted and woven using multifilaments mainly composed of molecularly oriented molded products of the specific polymer of the present invention usually have a basis weight of 100 to 800 g/m 2 , preferably 200 to 600 g/m 2 .

The ultra-high molecular weight ethylene polymer of the present invention is
Ethylene or ethylene and the α-olefin comonomer are mixed in the presence of a catalyst consisting of a transition metal compound of Groups IVb, Vb, VIb, or VIII of the Periodic Table and a metal hydride or organometal of Groups I to III of the Periodic Table. For example, it can be obtained by slurry polymerization in an organic solvent.

The ultra-high molecular weight ethylene polymer thus obtained is, for example, blended with a diluent to enable melt molding, or mixed with paraffin wax that is solid at room temperature, melt extruded, and then stretched. By doing so,
It is made into a molecularly oriented molded product such as fiber or tape.

As the diluent, a solvent for the ultra-high molecular weight ethylene polymer and various wax-like substances having dispersibility for the ultra-high molecular weight ethylene polymer are used.

The solvent preferably has a boiling point higher than the melting point of the polymer, more preferably higher than the melting point +20°C. Examples of such solvents include n-nonane, n-decane, n-undecane, n-dodecane, n-tetradecane, n-octadecane, liquid paraffin, aliphatic hydrocarbon solvents such as kerosene, xylene, naphthalene, Tetralin, butylbenzene, p-cymene, cyclohexylbenzene, diethylbenzene, benzylbenzene, dodecylbenzene, bicyclohexyl, decalin,
Aromatic hydrocarbon solvents such as methylnaphthalene and ethylnaphthalene or hydrogenated derivatives thereof, 1,1,2,2
-Halogenated hydrocarbon solvents such as tetrachloroethane, pentachloroethane, hexachloroethane, 1,2,3-trichloropropane, dichlorobenzene, 1,2,4-trichlorobenzene, bromobenzene, paraffinic process oil, naphthenic process oil , mineral oils such as aromatic process oils.

[0015] As the waxes, aliphatic hydrocarbon compounds or derivatives thereof are used.

The aliphatic hydrocarbon compounds are mainly saturated aliphatic hydrocarbon compounds, and usually have a molecular weight of 2.
000 or less, preferably 1000 or less, more preferably 800 or less, which is called a paraffin wax. These aliphatic hydrocarbon compounds include n-alkanes having 22 or more carbon atoms such as docosane, tricosane, tetracosane, and triacontane, mixtures of these with lower n-alkanes as main components, and separation and refinement from petroleum. So-called paraffin wax, which is a low molecular weight polymer obtained by copolymerizing ethylene or ethylene with other α-olefins, medium/low pressure polyethylene wax, high pressure polyethylene wax, ethylene copolymer wax, or medium/low pressure process Examples include waxes obtained by reducing the molecular weight of polyethylene such as polyethylene and high-pressure polyethylene by thermal degradation, oxides of these waxes, oxidized waxes modified with maleic acid, and waxes modified with maleic acid.

The aliphatic hydrocarbon compound derivatives include, for example, one or more, preferably one or two, particularly preferably one, aliphatic hydrocarbon group (alkyl group, alkenyl group) at the end or inside the aliphatic hydrocarbon group (alkyl group, alkenyl group). A compound having a functional group such as a carboxyl group, a hydroxyl group, a carbamoyl group, an ester group, a mercapto group, or a carbonyl group, with a carbon number of 8 or more, preferably a carbon number of 12 to 50, or a molecular weight of 130 to 2000, preferably 200 to 80.
0 fatty acids, aliphatic alcohols, fatty acid amides, fatty acid esters, aliphatic mercaptans, aliphatic aldehydes, aliphatic ketones, and the like. Specifically, fatty acids include capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid, and fatty alcohols include lauryl alcohol, myristyl alcohol,
Examples of the fatty acid amide include cetyl alcohol, stearyl alcohol, caprinamide, lauramide, palmitinamide, stearylamide, and stearyl acetate as the fatty acid ester.

[0018] The ratio of the ultra-high molecular weight ethylene polymer to the diluent varies depending on the type thereof, but is generally 3:97 to 80:20, particularly 15:85 to 60:40 by weight. It is better to use it as a ratio. If the amount of the diluent is lower than the above range, the melt viscosity will become too high, making melt kneading and melt molding difficult, and the surface of the molded product will be extremely rough, easily causing stretching breakage and the like. On the other hand, if the amount of the diluent is larger than the above range, melt-kneading will become difficult and the stretchability of the molded product will be poor.

[0019] Melt kneading is generally carried out at 150 to 300°C.
In particular, it is desirable to carry out the process at a temperature of 170 to 270°C; if the temperature is lower than the above range, the melt viscosity will be too high and melt molding will be difficult; if the temperature is higher than the above range, the melt viscosity will be The molecular weight of the high molecular weight ethylene polymer decreases, making it difficult to obtain a molded article with high elastic modulus and high strength. The blending may be carried out by dry blending using a Henschel mixer, a V-type blender, or the like, or by melt mixing using a single-screw or multi-screw extruder.

[0020] Melt molding is generally performed by melt extrusion molding. For example, drawn filaments can be obtained by melt extrusion through a spinneret, and drawn tapes can be obtained by extrusion through a flat or ring die. At this time, the molten material extruded from the spinneret may be subjected to drafting, that is, drawing in the molten state. The ratio of the extrusion speed VO of the molten resin in the die orifice to the winding speed V of the undrawn material cooled and solidified can be defined as a draft ratio by the following formula. Draft ratio = V/VO Such a draft ratio varies depending on the temperature of the mixture, the molecular weight of the ultra-high molecular weight ethylene polymer, etc., but it can usually be 3 or more, preferably 6 or more.

Next, the unstretched molded product of the ultra-high molecular weight ethylene polymer thus obtained is subjected to a stretching treatment. The stretching operation can be performed in one stage or in multiple stages of two or more stages. The stretching ratio depends on the desired molecular orientation and the accompanying effect of increasing the melting temperature, but it is generally satisfactory if the stretching operation is carried out at a stretching ratio of 5 to 80 times, particularly 10 to 50 times. Get the desired results. Generally, multi-stage stretching of two or more stages is advantageous, and in the first stage, 80
The stretching operation is performed while extracting the diluent in the extruded product at a relatively low temperature of 120 to 120°C, and in the second and subsequent stages,
It is preferable to continue the stretching operation of the molded body at a temperature of 120 to 160°C and higher than the first stage stretching temperature.

[0022] The molecularly oriented molded product thus obtained can be heat-treated under restrictive conditions if desired. This heat treatment is generally carried out at a temperature of 140 to 180°C, in particular 150 to 175°C, for 1 to 20 minutes, in particular 3 to 1
It can be done for 0 minutes. The heat treatment further advances the crystallization of the oriented crystal portions, shifts the crystal melting temperature to a higher temperature side, improves strength and elastic modulus, and improves creep resistance at high temperatures.

The process of molecular orientation in a molded article can be determined by X-ray diffraction, birefringence, fluorescence polarization, and the like. In the case of the drawn filament of the ultra-high molecular weight ethylene polymer of the present invention, the degree of orientation according to the half-width as described in detail in, for example, Yukichi Go and Kiichiro Kubo: Industrial Chemistry Magazine Vol. 39, p. 992 (1939), that is, The degree of orientation (F) defined by the formula (where H° is the half-width (°) of the intensity distribution curve along the Debye ring of the strongest paratropic plane on the equator) is 0.90 or more, especially when 0.
In terms of mechanical properties, it is desirable that the molecules be oriented so as to have a molecular orientation of 95 or more.

[0024] The uniform for ice hockey players of the present invention is made by knitting or weaving the molecularly oriented molded product of the ultra-high molecular weight ethylene polymer obtained in this way alone, or by making a blended fabric of this with nylon and/or polyester. However, in either case, it is knitted by a method known per se.

[0025]

[Effects of the Invention] According to the present invention, there is provided a uniform for ice hockey players made of yarn mainly composed of a molecularly oriented molded product of a specific polymer. It has excellent cut resistance, as well as abrasion and creep resistance, and is lightweight, so it does not interfere with the activities of ice hockey players who engage in intense exercise, and is able to withstand the harsh contact of skate blades and sticks. It also maintains durability so that it will not be torn apart.

[0026]

[Examples] The present invention will be explained below with reference to Examples. Reference Example 1 <Polymerization of ultra-high molecular weight ethylene/butene-1 copolymer> Slurry polymerization of ultra-high molecular weight ethylene/butene-1 copolymer was carried out using a Ziegler catalyst and 1 liter of n-decane as the polymerization solvent. Ta. A mixed monomer gas containing ethylene and butene-1 in a molar ratio of 97.2:2.8 was continuously supplied to the reactor so as to maintain a constant pressure of 5 kg/cm2. Polymerization was completed in 2 hours at a reaction temperature of 70°C. The yield of the obtained ultra-high molecular weight ethylene/butene-1 copolymer powder was 160 g, the intrinsic viscosity [η] (decalin: 135°C) was 8.2 dl/g, and the butene-1 content was determined by an infrared spectrophotometer. is 1.5 per 1000 carbon atoms
It was.

<Preparation of stretched oriented product of ultra-high molecular weight ethylene/butene-1 copolymer> 20 parts by weight of the ultra-high molecular weight ethylene/butene-1 copolymer powder obtained by the above polymerization and paraffin wax (melting point = 69 °C, molecular weight = 490)8
The mixture with 0 parts by weight was melt-spun under the following conditions. 3.5 parts by weight of the mixture as a process stabilizer
0.1 part by weight of -di-tert-butyl-4-hydroxytoluene was blended. Then, the mixture was passed through a screw extruder (screw diameter = 25 mm, L/D = 25,
(manufactured by Thermoplastics), set temperature 19
Melt kneading was performed at 0°C. Subsequently, the mixed melt was melt-spun using a spinning die with an orifice diameter of 2 mm attached to the extruder. The extruded melt was drawn off with a draft ratio of 36 times through an air gap of 180 cm, cooled in air,
It was solidified to obtain undrawn fibers. Furthermore, the undrawn fibers were drawn under the following conditions.

Two-stage stretching was carried out using three godet rolls. At this time, the heating medium in the first drawing tank was n-decane at a temperature of 110°C, and the heating medium in the second drawing tank was triethylene glycol at a temperature of 145°C. The effective length of each tank was 50 cm. When stretching,
By setting the rotation speed of the first godet roll to 0.5 m/min and changing the rotation speed of the third godet roll, oriented fibers with a desired drawing ratio were obtained. The rotational speed of the second godet roll was appropriately selected within a range that allowed stable stretching. Almost all of the initially mixed paraffin wax is n-
Extracted into decane. Thereafter, the oriented fibers were washed with water, dried under reduced pressure at room temperature for a day and night, and subjected to measurement of various physical properties. Note that the stretching ratio was calculated from the rotational speed ratio of the first godet roll and the third godet roll.

<Measurement of tensile properties> The elastic modulus and tensile strength were measured at room temperature (23° C.) using a tensile tester model DCS-50M manufactured by Shimadzu Corporation. At this time, the sample length between the clamps was 100 mm, and the tensile rate was 100 mm/min (100%/min strain rate). The elastic modulus was calculated using the slope of the tangent at the initial elastic modulus. The fiber cross-sectional area required for calculation was calculated from the weight, assuming a density of 0.960 g/cc.

<Tensile modulus and strength retention after heat history> The heat history test was conducted using a gear oven (Perfect Oven:
This was done by leaving it in a container (manufactured by Tabai Seisakusho). The sample had a length of about 3 m, and was folded over a stainless steel frame with a plurality of pulleys at both ends, and both ends of the sample were fixed. At this time, both ends of the sample were fixed to the extent that the sample did not sag, and no tension was actively applied to the sample. The tensile properties after the thermal history were measured based on the description of the measurement of tensile properties described above.

<Measurement of Creep Resistance> Creep resistance was measured using a thermal stress strain measuring device TMA/SS10 (manufactured by Seiko Electronics Co., Ltd.) with a sample length of 1 cm and an ambient temperature of 70°C.
℃, and the loading was carried out under accelerated conditions with a weight corresponding to 30% of the breaking load at room temperature. In order to quantitatively evaluate the amount of creep, the following two values were determined. That is, the values are the value of creep elongation (%) CR90 when 90 seconds have elapsed after applying a load to the sample, and the value of average creep rate (sec-1) ε when 180 seconds have elapsed from the time when 90 seconds have elapsed.

Table 1 shows the tensile properties of the multifilament obtained by bundling a plurality of drawn and oriented fibers.

The original crystal melting peak of the ultra-high molecular weight ethylene-butene-1 copolymer drawn filament (Sample-1) was 126.7°C, and Tp relative to the total crystal melting peak area.
The percentage was 33.8%. Also, the creep resistance is C
R90=3.1%, ε=3.03×10-5sec-
It was 1. Furthermore, after heat history at 170°C for 5 minutes, the elastic modulus retention rate was 102.2%, and the strength retention rate was 102.
No deterioration in performance due to thermal history was observed at 5%. Also, the amount of work required to break the drawn filament is 10.3
kg・m/g, and the density is 0.973g/cm3
, the dielectric constant is 2.2, and the dielectric loss tangent is 0.02.
4%, and the impulse voltage breakdown value is 180kV/
It was mm. The reduction rate of multifilament knot strength and loop strength with respect to linear strength was 38%, respectively.
It was 36%.

Reference Example 2 <Polymerization of ultra-high molecular weight polyethylene> Slurry polymerization of ultra-high molecular weight polyethylene was carried out using a Ziegler catalyst and 1 liter of n-decane as a polymerization solvent. Prior to polymerization, a mixed gas of ethylene gas and hydrogen gas was introduced into the reactor at a pressure of 5 kg/cm2 (including hydrogen gas partial pressure of 0.2 kg).
/cm2), and thereafter only ethylene gas was supplied to maintain the polymerization pressure at 5 kg/cm2. Polymerization was completed in 2 hours at a reaction temperature of 70°C. The yield of the obtained ultra-high molecular weight polyethylene was 170 g, and the intrinsic viscosity [
η] (decalin: 135°C) was 7.42 dl/g.

<Preparation of stretched and oriented ultra-high molecular weight polyethylene polymer> Ultra-high molecular weight polyethylene (homopolymer) powder (intrinsic viscosity [η]=7.42 dl/g, decalin,
A mixture of 20 parts by weight of paraffin wax (melting point = 69°C, molecular weight = 490) and 80 parts by weight of paraffin wax (melting point = 69°C, molecular weight = 490) was melt-spun and drawn using the method of Reference Example 1, and drawn to form a stretch-oriented fiber (sample-2). Obtained. Table 2 shows the tensile properties of the multifilament obtained by bundling a plurality of drawn and oriented fibers.

The original crystal melting peak of the ultra-high molecular weight polyethylene drawn filament (Sample-2) was 135.1°C;
The ratio of Tp to the total crystal melting peak area is 8.8
%Met. Similarly, the ratio of the high temperature side peak Tp1 to the total crystal melting peak area was 1% or less. Creep resistance is CR
90=11.9%, ε=1.07×10-3sec-1
Met. Further, after heat history at 170°C for 5 minutes, the elastic modulus retention rate was 80.4% and the strength retention rate was 78.2%. Furthermore, the amount of work required to break sample-2 is 10.2k.
g·m/g, density was 0.985 g/cm3, dielectric constant was 2.3, dielectric loss tangent was 0.030%, and impulse voltage breakdown value was 182 kV/mm. The reduction rates of the knot strength and loop strength of the multifilament with respect to the linear strength were 54% and 52%, respectively.

Example 1 A 10 gauge full needle rubber knitted fabric was knitted using 1000 denier multifilament of the drawn and oriented ultra-high molecular weight ethylene-butene-1 copolymer obtained in Reference Example 1 (Sample-1). did. The resulting cloth had a thickness of 1.8 mm and a basis weight of 585 g/m2. The cut resistance of this cloth was evaluated by the following method.

FIG. 1 shows a perspective view of the evaluation device, and FIG. 2 shows a side view thereof. Can move horizontally at constant speed, width 15cm
, Place two pieces of silicone rubber with a thickness of 3 mm on a sample fixing table (1) with a length of about 60 cm (2), place one piece of the above cloth on top of it (3), and fix the holding plate (4) with screws. It was fixed by A cutter holder (5) was provided at the center of the sample stand in the width direction to allow the cutter to be pushed down perpendicularly to the fixed stand. This knife mount (5)
is vertically supported by the support (6), but is supported without being restricted in its vertical movement. A single-edged razor blade (7) is attached to the lower end of the knife mount (5) at an angle of α = 15 degrees with respect to the surface of the sample cloth (3) as shown in Figure 2, and the upper end is connected to the knife mount. A load (8) was applied so that the total weight was 1 kg. 1 from sample holding plate (4)
Lower the cutting edge of the above device to the 0 cm position, and immediately
A tearing test was performed by moving the sample fixing table horizontally by 20 cm in the direction of the arrow at a speed of mm/min. The razor blade was replaced with a new one after each measurement, and 5 measurements were performed. As a result, there were no spots on the test cloth that had been cut with a razor blade, and there was no spot where the knitting structure frayed even when the section where the knife had been run was pulled with both hands.

Example 2 A 500-denier multifilament of a drawn and oriented ultra-high molecular weight ethylene-butene-1 copolymer (sample-1) was used as a core yarn, and a 200-denier spun yarn of nylon was applied 20 times/cm around its outer periphery. After coating with a pitch of
A core spun yarn was prepared by heat cutting. Next, a 10-gauge all-needle rubber knitted fabric was knitted using this core spun yarn. The thickness of the obtained cloth is 1.95mm
The basis weight was 610 g/m2. As a result of evaluating the cut resistance of this cloth using the same method as in Example 1, it was found that the nylon spun yarn on the surface layer was cut, but the core material Techmilon was not cut, and the part where the knife ran could be spread out with both hands. However, the knitted structure did not fray.

Example 3 As the fibers for braiding the cloth, 1000% of the stretched and oriented ultra-high molecular weight polyethylene obtained in Reference Example 2 (Sample-2) was used.
A cloth was braided in the same manner as in Example 1, except that denier multifilament was used, and a cut resistance test was conducted. however,
The thickness of the obtained cloth is 1.8mm, and the basis weight is 589g.
/m2. As for the cut resistance of this cloth, as in Example 1, there were no places torn by the razor blade, and the knitted structure did not fray even when the part where the knife had been run was pulled and expanded with both hands.

Example 4 Stretched and oriented ultra-high molecular weight polyethylene as core thread (Sample-2)
A core spun yarn was prepared in the same manner as in Example 2 using a 500 denier multifilament with a 200 denier nylon spun yarn on the side. Next, a 10 gauge all-needle rubber knitted fabric was braided using this core spun yarn to a thickness of 1.
．． A cloth having a diameter of 95 mm and a basis weight of 605 g/m2 was obtained. The cut resistance of this cloth was evaluated in the same manner as in Example 1. As a result, the nylon spun yarn on the surface layer was found to have been cut, but the core material Techmilon was not cut. There was no part where the knitting structure frayed even when it was spread out.

Comparative Example A 10 gauge full needle rubber knitted fabric was knitted in the same manner as in Example 1 using nylon 1260 denier/204 filament. The thickness of the obtained cloth was 2.15 mm, and the basis weight was 661.
g/m2. Example 1 shows the cut resistance of this cloth.
Using the same method as above, the cloth was cut into pieces by a razor blade.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an apparatus for evaluating cut resistance in an embodiment of the present invention.

FIG. 2 is a side view of the device of FIG. 1;

Claims (5)

[Claims] Claim 1: The intrinsic viscosity [η] is at least 5 dl/
A uniform for ice hockey players consisting of a knitted fabric mainly composed of a molecularly oriented molded product of an ultra-high molecular weight ethylene polymer. 2. The uniform according to claim 1, wherein the knitted fabric is a blended fabric of drawn yarns of ultra-high molecular weight ethylene polymer and nylon and/or polyester yarns. 3. The ultra-high molecular weight ethylene polymer contains ethylene and α-olefin containing on average 0.1 to 20 α-olefins having 3 or more carbon atoms per 1000 carbon atoms.
The uniform according to claim 1 or 2, which is an olefin copolymer. 4. The α-olefin is butene-1,4-
The uniform according to claim 3, which is one or more selected from the group consisting of methylpentene-1, hexene-1 and decene-1. Claim 5: The content of α-olefin is 1 carbon atom.
5. The uniform according to claim 3 or 4, having an average number of 0.5 to 10 pieces per 000 pieces.