JP2014009954A - Rain coat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rain coat suitable for wearing in performing a work in rainy weather under an environment polluted with radioactive particles.SOLUTION: A rain coat has a jacket and a lower garment that are respectively formed by sewing multiple multi-layered nonwoven pieces. The jacket has a hood for covering a head part. The lower garment includes: bottoms constituted by inner bottoms and outer bottoms for covering the inner bottoms; a lower garment front body extending upward from a front edge of the upper end of a lower garment body and covering an area from an abdominal part to a chest part; and a lower garment rear body extending upward from a rear edge of the upper end of the lower garment body and covering a back. Sewed parts are sealed from an inside with the use of a seal-up tape. Rubber bodies for allowing a hood opening, right and left wrists, a lower end opening of the jacket, and lower end openings of the inner bottoms to be expansible are stored in the upper part of an opening edge of the hood, the right and left wrists of the jacket, the lower end opening of the jacket, and the lower end openings of the inner bottoms. An antistatic agent is applied on the outer surfaces of the jacket and the lower garment.

Description

  The present invention relates to a raincoat suitable for wearing when working in the rain in a contaminated environment with radioactive fine particles.

  In the event of a nuclear accident such as meltdown of a nuclear reactor at a nuclear power plant, various types of radioisotopes that are extremely toxic to the human body, such as cesium 134, cesium 137, and strontium 90, are released into the atmosphere. Many of the radioactive isotopes released into the atmosphere then fall to the surface of the earth and the sea as radioactive fallen objects. And if the soil fine particles on the ground surface are rolled up by wind or the like, they will float in the atmosphere again as radioactive fine particles containing radioactive isotopes.

  When such radioactive fine particles are taken into the body, if the radioactive fine particles contain radioactive isotopes that are not easily excreted from the body, the risk of exposure to the body becomes extremely high. Therefore, it is essential for workers who work in an environment contaminated with radioactive fine particles to wear protective clothing with a high particle blocking ability.

  In rainy weather, radioactive fine particles dispersed in rainwater may pass through protective clothing as rainwater penetrates. Therefore, it is preferable to wear a raincoat over protective clothing when it is raining in a contaminated environment with radioactive fine particles.

  As for the raincoat, various proposals as disclosed in, for example, the following Patent Documents 1 to 4 have been conventionally made.

JP 2001-214309 A JP 2001-140114 A JP 2001-40511 A JP-A-9-137309

  It is desirable to wear a raincoat with a high particle blocking ability during activities in the rain in areas contaminated with radioactive particles. However, a raincoat that is supposed to be worn in an area contaminated with radioactive fine particles has not been proposed. Therefore, in rainy weather, workers are forced to wear an existing raincoat with a low particle shielding ability, and there is a high possibility that they will be exposed.

  Therefore, an object of the present invention is to provide a raincoat suitable for wearing when working in the rain in a contaminated environment with radioactive fine particles.

  (1) A raincoat according to the present invention is a raincoat provided with an upper garment and a lower garment, wherein the upper garment and the lower garment are each formed by sewing a plurality of multilayer nonwoven fabric pieces, and the upper garment has a head portion. The lower garment has a hood that covers the inner hem and the outer hem that covers the inner hem, and the lower garment that extends upward from the front edge of the upper end of the lower garment body and covers from the abdomen to the chest And a lower garment rear body that extends upward from the rear edge of the upper end of the lower garment body and covers the back, and the sewn portion is sealed from the inside by a cover tape, an upper edge of the hood opening, The left and right cuffs, the lower end opening of the upper garment, and the lower end opening of the inner hem, the hood opening, the left and right cuffs, the lower end opening of the upper garment, and the lower end opening of the inner hem can be expanded and contracted. A rubber body is accommodated, and an antistatic agent is applied to the outer surfaces of the upper and lower garments.

  (2) Moreover, in the raincoat of said (1), a multilayer nonwoven fabric piece is a 3 layer structure comprised from an outer side 1st spunbond layer, an intermediate | middle melt-blown layer, and an inner side 2nd spunbond layer. The raincoat is worn over protective clothing.

  (3) Moreover, in the raincoat of said (1), a multilayer nonwoven fabric piece has a two-layer structure comprised from an outer side polypropylene layer and an inner side polyethylene layer.

  According to the raincoat of the first aspect, since the radioactive fine particles can be prevented from entering the inside through the opening, the raincoat is suitable for wearing when working in the rain in a contaminated environment with the radioactive fine particles. If the raincoat is worn, the wearer is very unlikely to be exposed to radioactive fine particles, and the risk of internal exposure can be reduced.

  The raincoat according to claim 2 has an excellent fine particle shielding ability while having a certain degree of air permeability. Therefore, by wearing the raincoat on ordinary protective clothing, the wearer can greatly reduce the risk of being exposed to radioactive fine particles. In addition, since moisture does not easily accumulate between the protective clothing and the raincoat, it can be worn comfortably.

  Since the raincoat according to claim 3 has a very high water resistance and hardly has air permeability, it is possible to shield the entry of radioactive fine particles without wearing protective clothing underneath.

It is the figure which showed the raincoat of this invention. It is the figure which showed a mode that the raincoat of this invention was worn. It is the figure which showed a mode that only the lower garment was worn. It is the figure which showed the structure of the lower garment. (A) is the figure which looked at the lower garment from the front side, (b) is the figure which looked at the lower garment from the rear side. It is the figure which showed the mode inside the skirt at the time of wearing a lower garment. It is the figure which showed the cross section of the multilayer nonwoven fabric. (A) is the figure which showed the cross section of the SMS nonwoven fabric, (b) is the figure which showed the cross section of the PP-PE nonwoven fabric.

  Hereinafter, the raincoat of the present invention will be described in detail with reference to the drawings. In addition, the front-back, left-right, up-down direction in this specification respond | corresponds with the front-back, left-right, up-down, seen from the wearer of the raincoat.

  FIG. 1 is a view showing a raincoat 1 of the present invention. The raincoat 1 includes an upper garment 2 worn on the upper body and a lower garment 3 worn on the lower body.

  The upper garment 2 includes a hood 11 for covering and protecting the wearer's head, and the hood 11 has a hood opening 12. A rubber body is accommodated in the opening edge upper portion 12a of the hood opening 12, and the hood opening 12 can be expanded and contracted in accordance with the wearer's head shape. That is, the hood 11 covers the wearer's forehead, cheeks, and chin while the hood opening 12 is in close contact with the wearer's skin, and only the periphery of the eyes, nose, and mouth is exposed. It is configured to be able to. The wearer wears the raincoat 1 and wears a protective mask or goggles to shield the entry of radioactive fine particles into the raincoat 1 and prevent the head from being exposed.

  An annular rubber body is accommodated in the left and right cuffs 13 and 13 of the upper garment 2, and the left and right cuffs 13 and 13 can be freely expanded and contracted according to the size of the wearer's left and right wrists. The wearer wears the protective glove and then wears the upper garment 2 to shield the entry of radioactive fine particles into the raincoat 1 and prevent the left and right hands from being exposed.

  An annular rubber body is accommodated in the lower end opening 14 located at the lower end of the upper garment 2, and the lower end opening 14 can be expanded and contracted according to the size of the wearer's waist. As shown in FIG. 2, the wearer wears the lower garment 3 and then covers the upper garment 2 to cover the lower garment 3, thereby shielding the intrusion of radioactive fine particles into the raincoat 1 and exposing the trunk. Can be prevented.

  The lower garment 3 includes a lower garment front body 32 that extends upward from the upper edge front edge 31 a of the lower garment body 31, and a lower garment rear body that extends upward from the upper edge rear edge 31 b of the lower garment body 31. 33. The upper end of the lower garment front body 32 and the upper end of the lower garment rear body 33 are connected via left and right string members 34, 34. Since the waist of the lower garment 3 does not contain a rubber body that can expand and contract the waist, the lower garment 3 can be easily worn. When the lower garment 3 is worn, the left and right legs 34, 34 may be hung on the left and right shoulders after the left and right legs are inserted while holding the left and right strings 34, 34 by hand. Note that the left and right string members 34, 34 may be a string having poor stretchability or a stretchable rubber body.

  When the lower garment 3 is worn, as shown in FIG. 3, the abdomen to the chest of the wearer are covered with the lower garment front body 32 and the wearer's back is covered with the lower garment rear body 33. And since the upper garment 2 is worn so that the upper part may be covered from the waist part periphery of the lower garment 3 after wearing the lower garment 3, it can prevent effectively that a wearer's torso is exposed to radioactive fine particles. Furthermore, since the torso of the wearer is double protected by the lower garment front body 32 and the lower garment rear body 33 and the upper garment front body 16 and the upper garment rear body 17, the strength of the circumference of the raincoat 1 can be increased. .

  As shown in FIG. 1 and FIG. 4, the left and right hems 35, 35 at the lower end of the lower garment body 31 are constituted by left and right inner hems 36, 36 and left and right outer hems 37, 37 covering the left and right inner hems 36, 36. It has a double structure. An annular rubber body is accommodated in the lower end openings 36a and 36a of the left and right inner hems 36 and 36, and the left and right inner hems 36 and 36 can be expanded and contracted according to the size of the wearer's ankle. The upper edge portions of the left and right inner hems 36, 36 are sewn to the inner peripheral surfaces of the left and right outer hems 37, 37, and the lower end openings 37a, 37a of the left and right outer hems 37, 37 are the lower ends of the left and right inner hems 36, 36. The openings 36a and 36a are extended further downward, so that the left and right outer hems 37 and 37 can completely cover the outside of the left and right inner hems 36 and 36. When the lower garment 3 is worn, as shown in FIG. 5, the left and right inner hems 36 and 36 are inserted into the boots 100, and the entire body portion 101 of the boots 100 is covered with the left and right outer hems 37 and 37. Can do. Therefore, the penetration of radioactive fine particles into the raincoat 1 is shielded, and it is possible to effectively prevent the wearer's foot from being exposed.

  The upper garment 2 is formed by sewing left and right hood pieces 15, 15, an upper garment front body 16, an upper garment rear body 17, and left and right sleeves 18, 18.

  On the other hand, the lower garment 3 is formed by sewing the left and right leg pieces 38, 38 constituting the lower garment main body 31, the lower garment front body 32, the lower garment rear body 33, and the left and right inner hems 36, 36. Has been. The left and right outer hems 37 and 37 are formed at the lower ends of the left and right leg pieces 38 and 38, respectively.

  The lower garment 3 is further sewn with a buttock reinforcement piece 40 on the heel part 39 from the inside, and is sewn with left and right knee part reinforcement pieces 42 and 42 on the left and right knee parts 41 and 41 from the inside. The heel portion reinforcing piece 40 has a substantially rectangular shape, and is sewn inside the heel portion 39 so that each side is oriented in a substantially vertical direction or a substantially horizontal direction. Note that, in the substantially rectangular heel portion reinforcing piece 40, only the upper side 40a and the left and right sides 40b, 40c are sewn to the heel portion 39, and the lower side 40d is not sewn to the heel portion 39. Thus, by setting a part (lower side 40d) of the buttocks reinforcement piece 40 as a free end without stitching, the tension can be dispersed when tension is generated in the buttocks reinforcement piece 40. It can be prevented from being damaged.

  All the sewn portions A of the upper garment 2 and the lower garment 3 are sealed from the inside with a cover tape T. By sealing the sewing portion A with the weather tape T, it is possible to prevent the radioactive fine particles from entering the inside through holes or gaps that may be formed in the sewing portion. As the weather strip T, for example, a hot melt tape or the like can be used. If a hot melt tape is used, it can be heat-pressed using an iron or the like, and the sewn portion A can be easily sealed.

  Antistatic agent B is applied to the outer surfaces of upper garment 2 and lower garment 3 (see FIG. 6). By applying the antistatic agent B, it is possible to prevent dry radioactive fine particles from adhering to the outer surfaces of the upper garment 2 and the lower garment 3.

  Left and right hood pieces 15 and 15 of the upper garment 2, upper garment front body 16, upper garment rear body 17, left and right sleeves 18 and 18, and lower garment front body 32, lower garment rear body 33, left and right inner hems 36 and 36, The left and right leg pieces 38, 38, the buttocks reinforcement piece 40, and the left and right knee reinforcement pieces 42, 42 are formed of a multilayer nonwoven fabric having a structure in which a plurality of nonwoven fabric layers are laminated. In the present invention, left and right hood pieces 15, 15 of the upper garment 2, upper garment front body 16, upper garment rear body 17, left and right sleeves 18, 18, and lower garment front body 32, lower garment rear body 33, left and right inner hems The multilayer nonwoven fabric forming the 36, 36, the left and right leg pieces 38, 38, the buttocks reinforcement piece 40, and the left and right knee reinforcement pieces 42, 42 is referred to as a multilayer nonwoven fabric piece C. The upper garment 2 and the lower garment 3 are formed by sewing the plurality of multilayer nonwoven fabric pieces C.

  As a multilayer nonwoven fabric, a nonwoven fabric having a three-layer structure composed of an outer first spunbond layer 51, an intermediate meltblown layer 52, and an inner second spunbond layer 53 as shown in FIG. In the present invention, a non-woven fabric having a two-layer structure composed of an outer polypropylene layer 54 and an inner polyethylene layer 55 as shown in FIG. In the present invention, it may be simply referred to as a PP-PE non-woven fabric). Antistatic agent B is applied to the surface of the multilayer nonwoven fabric, that is, the surface of the first spunbond layer 51 of the SMS nonwoven fabric and the surface of the polypropylene layer 54 of the PP-PE nonwoven fabric. The antistatic agent B may be applied before the multilayer nonwoven fabric pieces C are stitched, or may be applied after the multilayer nonwoven fabric pieces C are stitched to form the upper garment 2 and the lower garment 3.

  The melt blown layer 52 in the SMS nonwoven fabric is formed thinner than the first spunbond layer 51 and the second spunbond layer 53. The melt blown layer 52 is charged with static electricity.

  In the case of the upper garment 2 and the lower garment 3 formed using the SMS nonwoven fabric, most of the dried radioactive fine particles cannot fall on the surface of the first spunbond layer 51 to which the antistatic agent B is applied and fall. Furthermore, most of the fine radioactive particles having a small particle diameter that have passed through the first spunbond layer 51 are adsorbed by the meltblown layer 52 charged with static electricity. Therefore, the upper garment 2 and the lower garment 3 formed using the SMS nonwoven fabric exhibit excellent radioactive fine particle shielding ability.

  On the other hand, in the case of the upper garment 2 and the lower garment 3 formed using a PP-PE nonwoven fabric, the material itself has little air permeability, and the surface of the outer polypropylene layer 54 is coated with the antistatic agent B. Therefore, almost all of the radioactive fine particles can be prevented from entering.

  The performance test data of the SMS nonwoven fabric and PP-PE nonwoven fabric used in the present invention are shown in Table 1 below. In this test, SMS nonwoven fabric and PP-PE nonwoven fabric not coated with antistatic agent B were used.

The mass per unit area (g / m ³ ) was measured based on JIS L 1096.

  Tensile strength (N) and elongation (%) were measured based on JIS T 8115 (cut strip method). The measurement was performed under the conditions of a tensile speed of 10 cm / min, a grip interval of 20 cm, and a test piece width of 5 cm.

  The tear strength (N) was measured based on JIS T 8115 (trapezoid method). The measurement was performed under the conditions of a tensile speed of 10 cm / min and a specimen width of 7.5 cm.

  The water resistance (cm) was measured based on the JIS L 1092 A method.

The moisture permeability (g / m ³ · h) was measured based on the JIS L 1099 A-1 method (calcium chloride method).

  Air permeability (sec) was measured based on JIS P 8117 (Oken type tester method (JAPAN TAPPI No. 5: 2000 Oken type)).

The dust collection efficiency (%) was measured under the following conditions.
Sample surface wind speed (calculated value): 0.0961: cm / sec
Measurement sample area: 491 cm ²
Measurement surface (upstream side): Front side (in the case of SMS nonwoven fabric, the surface side of the first spunbond layer 51. In the case of PP-PE nonwoven fabric, the surface side of the polypropylene layer 54)
-Particle counter: Met One 237B
・ Aspiration amount: 0.1 ft ^{3 /} min (2.83 L / min)
・ Laundry treatment: Untreated

The procedure for measuring the dust collection efficiency (%) is as follows.
(1) Fix the sample to the permeation device with an O-ring, and suck clean air to confirm that the dust becomes zero.
(2) Install a permeation device without attaching a sample at the outlet of the dust generation device, and measure the number of dust before the sample measurement.
(3) A sample is attached to the transmission device, and the number of dust after transmission is measured.
(4) Remove the sample from the transmission device and measure the number of dust after the sample measurement.
(5) The dust collection efficiency is calculated from the following formula. The test result shall be rounded off to the second decimal place to obtain three significant figures.
Dust collection efficiency (%) = {(number of dust before transmission−number of dust after transmission) / number of dust before transmission} × 100

  Here, the number of dust before permeation is the average of each measurement value for the remaining 11 minutes after cutting the maximum value and the minimum value two times from each measurement value 15 times per minute before and after sample measurement. Represents. The post-permeation dust count is a measurement value for the remaining 11 minutes, measured continuously 15 times per minute and cut into two maximum values and minimum values.

  By the way, it is said that the size of radioactive fine particles floating in the atmosphere due to a nuclear accident is small and submicron. For example, it has been reported that the particle size of iodine 131 scattered in the Chernobyl nuclear accident is 0.3 to 1.0 μm. Iodine 131 has a half-life of about 8 days and is not a problem in the long term. However, in the case of cesium 137, since the half-life is about 30 years, strong radioactivity is released over a long period of time. However, since cesium 137 has a property of being strongly adsorbed by soil, the size of radioactive fine particles containing cesium 137 floating in the atmosphere is larger than at least 0.3 to 1.0 μm unless it is immediately after the occurrence of a nuclear accident. It is considered a thing.

  As can be seen from the performance test data, the SMS nonwoven fabric has a very high dust collection efficiency for fine particles having a size of 0.3 μm or more while having a certain level of air permeability. Therefore, by wearing the raincoat 1 of the present invention using the SMS nonwoven fabric after wearing the normal protective clothing, the worker shields the entry of radioactive fine particles into the protective clothing, and the risk of exposure is extremely low. can do. In addition, since the raincoat 1 of the present invention using the SMS nonwoven fabric has a certain level of air permeability, moisture is not easily trapped between the protective clothing and the raincoat 1 and can be worn comfortably.

  On the other hand, it can be seen that the PP-PE non-woven fabric has a very high water resistance and almost no breathability. Therefore, if it is the raincoat 1 of this invention using PP-PE nonwoven fabric, the penetration | invasion of radioactive fine particles can be shielded without wearing protective clothing under. That is, the raincoat 1 of the present invention using a PP-PE nonwoven fabric can be used as a raincoat that can also be used as protective clothing.

  As described above, the raincoat 1 of the present invention has an excellent fine particle shielding ability. Therefore, if the raincoat 1 of the present invention is worn when working in a rainy environment in a contaminated environment with radioactive fine particles, the possibility that the wearer will be exposed to radioactive fine particles becomes extremely low and the risk of internal exposure is reduced. can do.

DESCRIPTION OF SYMBOLS 1 Raincoat 2 Upper garment 3 Lower garment 11 Hood 12a Opening edge upper part 13 Left and right cuffs 14 Upper lower edge opening part 31a Upper end front edge 31b Upper end rear edge 32 Lower garment front body 33 Lower garment rear body 35 Bottom 36a Inner lower end of inner hem Opening 36 Inner hem 37 Outer hem 39 Ridge part 41 Knee part 51 First spunbond layer 52 Melt blown layer 53 Second spunbond layer 54 Polypropylene layer 55 Polyethylene layer A Sewing part B Antistatic agent C Multilayer nonwoven fabric piece T Sealing tape

Claims (3)

A raincoat with an upper garment and a lower garment,
Each of the upper garment and the lower garment is formed by sewing a plurality of multilayer nonwoven fabric pieces,
The upper garment has a hood that covers the head,
The lower garment is composed of an inner hem and an outer hem that covers the inner hem, a lower garment front body that extends upward from the front edge of the upper end of the lower garment body and covers the abdomen to the chest, A lower garment back body that extends upward from the rear edge of the upper end of the lower garment body and covers the back,
The sewn part is sealed from the inside by a cover tape,
The upper opening edge of the hood, the left and right cuffs of the upper garment, the lower opening of the upper garment, and the lower opening of the inner hem, the hood opening, the left and right cuffs, and the lower opening of the upper garment And a rubber body that allows the lower end opening of the inner hem to be freely expanded and contracted,
A raincoat, wherein an antistatic agent is applied to outer surfaces of the upper garment and the lower garment. The multilayer nonwoven fabric piece has a three-layer structure composed of an outer first spunbond layer, an intermediate meltblown layer, and an inner second spunbond layer,
The raincoat according to claim 1, wherein the raincoat is worn on protective clothing. The raincoat according to claim 1, wherein the multilayer nonwoven fabric piece has a two-layer structure including an outer polypropylene layer and an inner polyethylene layer.

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