JPH08336902A - Member for x-ray apparatus - Google Patents

Abstract

PURPOSE: To eliminate the protrusions of the interstices of a woven fabric on an X-ray photograph while reducing the weight by specifying the cover factor of a fiber-reinforced woven fabric using flat reinforcing fiber yarns for specifying the width of a single yarn and yarn width/thickness ratio. CONSTITUTION: A top plate 1 is required for not only X-ray transmittance but also high strength capable of holding a human body 3, and hence used with fiber-reinforced plastic(FRP), and the interstices of a woven fabric in the FRP do not protrude on a film photographed by X-ray transmitted through the plate 1 while obtaining excellent X-ray transmittance. Particularly, the FRP of a sandwich structure is suitable for the plate 1, and can easily obtain necessary strength characteristics. That is, further reinforced fiber woven material is formed of flat yarn woven fabric in which at least one of warps and wefts is arranged with the fibers in the state of woven fabric at the flat reinforcing fiber yarn having the width of a single yarn of 3 to 16mm, the yarn width/ thickness ratio of 20 or more and the cover factor is 90 to 100%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member for X-ray equipment, and more particularly, a member for X-ray equipment such as a top plate, a film contact plate, a film cassette and the like, which is made of fiber reinforced plastic (hereinafter also referred to as FRP). Regarding

[0002]

2. Description of the Related Art FRP has excellent mechanical properties while being lightweight, and in particular, FRP having carbon fiber or aramid fiber as a reinforcing fiber has excellent X-ray transparency. Therefore, in various members for X-ray equipment, attention has begun to be paid attention as a material to be used for a portion where X-ray transparency is required.

FRP is usually formed by molding a plurality of layers of reinforced fiber material with a resin, and is molded. However, before molding, handling during molding, easiness of fitting to a mold, and after molding, In view of obtaining excellent characteristics as the FRP, the reinforced fiber woven fabric in the form of woven fabric is frequently used as the reinforced fiber material.

When a carbon fiber thread or an aramid fiber thread is used as the reinforcing fiber thread of this reinforced fiber woven fabric to form an FRP, it has good X-ray permeability and allows weak X-rays to pass through a necessary portion. As a result, the amount of exposure to the human body can be reduced.

[0005]

However, when such weak X-rays are used, X-rays transmitted through the resin portion in the FRP in which the reinforcing fibers are not present and X rays transmitted through the reinforcing fiber-existing portion.
The difference in the intensity with respect to the lines (intensity ratio) becomes large, and the woven fabric in the FRP tends to be noticeable in the photograph taken on the X-ray film. In order to prevent the appearance of the woven fabric, the cover factor of the woven fabric may be increased to nearly 100% and the resin portion where the reinforcing fiber does not exist may be removed. However, the conventional reinforced fiber fabric obtains such a high cover factor. Was difficult.

The present invention pays attention to such a present situation, and particularly in a portion of a member for X-ray equipment which is required to have X-ray permeability, the portion is changed from a member including FRP using a specific reinforced fiber woven fabric. The object of the present invention is to prevent the fabric from appearing in the X-ray photograph while achieving the target weight reduction by configuring.

[0007]

The member for X-ray equipment of the present invention which meets the above object uses an X-ray transmitting portion made of a fiber reinforced plastic obtained by impregnating a plurality of layers of reinforcing fiber material with resin.
In the member for wire equipment, at least one layer of reinforcing fiber material is a flat reinforcing fiber thread having a single thread width of 3 to 16 mm and a thread width / thickness ratio of 20 or more, which is at least one of warp and weft. At least one of the warp yarn and the weft yarn is formed of a flat yarn woven fabric in which fibers are parallel to each other in a woven state and a cover factor is 95 to 100%. The cover factor is preferably 98 to 100%.

At least one of the warp thread and the weft thread is
It is also possible to adopt a form in which a plurality of the flat reinforcing fiber threads are laminated. By doing so, it is possible to fabricate a fabric having a large basis weight, and it is possible to mold an FRP having a larger fiber volume content.

As the reinforcing fiber yarn, carbon fiber yarn and aramid fiber yarn are particularly preferable from the viewpoint of X-ray transparency. Among them, carbon fiber yarns having high elastic modulus and high strength properties in addition to good X-ray transparency are preferable. This flat reinforcing fiber yarn is usually in the form of a multifilament yarn.

The woven yarn of the woven fabric composed of such flat reinforcing fiber yarns needs to have substantially no twist and the fibers are parallel to each other. Here, "substantially no twist" means
A state in which there is no twist of 1 turn or more per 1 m of yarn length. In other words, it means a realistic untwisted state. It is necessary that the woven state is substantially untwisted. for that purpose,
A bobbin of untwisted flat reinforcing fiber yarn is unwound and unwound, and warps and wefts are supplied so as to prevent untwisting, and a woven fabric is obtained.

When the woven yarn is twisted, the yarn width is narrowed and bundled into thick portions at the twisted portion, and voids are formed between the woven yarns in which substantially no reinforcing fibers are present, or the woven fabric is woven. Concavities and convexities easily occur on the surface. The voids as described above cause a decrease in the cover factor, making it difficult to achieve the target cover factor. Also,
The unevenness as described above may cause stress concentration on the twisted portion when an external force acts on the woven fabric, resulting in non-uniform strength characteristics when molded into FRP or the like. Further, in the member for X-ray equipment, since there are many portions which are in direct contact with the X-ray film as described later, the smoothness of the surface is required. If the unevenness of the woven fabric is large, the desired surface smoothness cannot be obtained when the woven fabric is molded into FRP.

The flat reinforcing fiber yarn has a yarn width of 3 to 16 m.
The range is m. A yarn width in this range is easy to weave, and an optimum flattened state is easily obtained in relation to the yarn thickness. The yarn width / thread thickness ratio is 20 or more. Less than 20, 100%
It is difficult to minimize the crimp of the weaving yarn to obtain a cover factor close to.

In such an optimal flattened reinforcing fiber woven fabric made of a yarn having substantially no twist, even if the fineness of the yarn is increased, the crimp at the intersection of the yarns can be suppressed to be extremely small. The desired surface smoothness can be easily obtained by using FRP or carbon fiber reinforced plastic (CFRP). Moreover, since the crimp is small, high strength characteristics can be obtained.

Further, since the crimp is suppressed to a very small value, the fabric weight can be set high, and the cover factor can be set close to 100% while the flat state of the weaving yarn is secured. Therefore, in the FRP, it is possible to substantially eliminate the resin portion in which the reinforcing fibers are not present so that the fabric is not noticeable in the photograph taken by the transmission X-ray.

Further, since each woven yarn is maintained in a flat state in the form of a woven fabric, the resin impregnation property is extremely good. Therefore, the FRP having uniform characteristics can be obtained, and the target strength can be uniformly and easily obtained.

[0016] Here, the cover factor Cf (%), a factor related to the size of the gap portion formed between weaving yarns, when setting a region of area S ₁ on the textile, the area S ₁
When the area of the void portion formed in the yarn in the inner and S _2, refers to a value defined by the following equation. Cover factor Cf = [(S ₁ −S ₂ ) / S ₁ ] × 1
00

The reinforcing fiber woven fabric of the present invention uses warp threads or weft threads made of thin and flat reinforcing fiber threads. Therefore,
A woven fabric with a small dropout degree, that is, a large cover factor. When FRP is molded using such a reinforced fiber woven fabric having a large cover factor, the woven fabric is not visible in the X-ray photograph as described above, and a uniform molded product is obtained, and voids are contained in the resin and stress is reduced. There is no uneven distribution of fibers that concentrates.

As a method of producing the flat yarn itself as described above, for example, in the manufacturing process of the reinforcing fiber yarn,
A fiber bundle composed of a plurality of reinforcing fibers may be spread by a roll or the like to a predetermined width and kept in a flat shape, or may be held by a sizing agent or the like so as not to return to its original shape. In particular, in order to maintain the flat shape well,
It is preferable to adhere a small amount of the sizing agent of about 0.1 to 1.5% by weight to the flat yarn.

When the flat reinforcing fibers are woven into warp and weft, the fabric weight is 100 to 350.
It is preferably g / m ² . Further, in the case of a woven fabric in which flat reinforcing fiber yarns are at least one of warp yarns and weft yarns, and when at least one of the warp yarns and the weft yarns is a woven fabric in which a plurality of flat reinforcing fiber yarns are laminated, Is preferably 200 to 700 g / m ² .
Since it is a flat woven yarn, the crimp can be suppressed to a small level even if the yarn is woven in such a laminated state. Then, the fiber density of the woven fabric can be increased by the lamination.

Further, it may be in the form of a fabric using auxiliary threads. As the auxiliary yarn, it is preferable to use a flat woven yarn made of fine fibers having a fineness of 2,000 denier or less, and more preferably 50 to 600 denier. If the fineness of the auxiliary yarn is large, the crimp becomes large, and if the fineness is small, the auxiliary yarn is easily cut during weaving or handling. This auxiliary yarn is used for the purpose of integrally holding parallel flat woven yarns, and inorganic fibers such as carbon fiber or glass fiber, organic fibers such as polyaramid fiber, vinylon fiber, polyester fiber can be used. There is no particular limitation regarding.

Here, the fiber density of the woven fabric means a value defined by the following equation. Textile fiber density (g / m ³ ) = [texture weight (g / m ³
m ² )] / [woven fabric thickness (mm)] Note that the fabric weight (g / m ² ) and the fabric thickness (mm)
Are values measured in accordance with JIS R7602.

The woven structure of the reinforced fiber woven fabric is not particularly limited, but a twilled structure is preferable in view of the problem of warpage after FRP molding and the cover factor in the woven form.
In the case of a flat structure, warpage does not occur when molded into FRP, but the cover factor tends to be small. In the case of the satin organization, the cover factor is large, but F
Warpage tends to occur when molded into RP. In this point-twill structure, not only warpage does not occur after FRP molding, but also a large cover factor can be easily obtained.

A plurality of reinforced fiber materials made of the reinforced fiber woven fabric as described above are laminated, the reinforced fiber materials are impregnated with a resin, and molded into a member for X-ray equipment made of FRP. The member for X-ray equipment may be composed of only the FRP itself, or may be structured to use the FRP only in the X-ray transmission site.

Examples of the target X-ray equipment member include a top plate, a film contact plate, and a film cassette. Among them, particularly in the top plate, it is preferable to form the FRP into a sandwich structure material provided on both sides of a core material made of a foam. As the foam, for example, polyurethane foam, acrylic foam, or urethane foam can be used.

The matrix resin used for the FRP molding according to the present invention includes thermosetting resins such as epoxy resin, unsaturated polyester resin, vinyl ester resin, polyimide resin and phenol resin. These thermosetting resins are B stage when impregnated into the fabric. As the matrix resin, nylon resin,
Polyester resin, polybutylene terephthalate resin,
Thermoplastic resins such as polyetheretherketone (PEEK) resin and bismaleimide resin can also be used.

In the member for X-ray equipment according to the present invention,
Since the reinforced fiber woven fabric used for the FRP molding is a specific flat yarn woven fabric, it has excellent mechanical properties and weight reduction, as well as excellent surface smoothness, and when it is taken in an X-ray photograph, It is possible to realize an excellent member which does not show the eyes of the woven fabric. Therefore, the FRP having such excellent characteristics
Is a member for various X-ray equipment that requires X-ray transparency, such as a top plate, a film contact plate, or a film cassette.
It can be applied to wire equipment members.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Members for X-ray equipment according to the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a X-ray of a necessary part of a human body 3 using a top plate 1 and a film contact plate 2.
1 shows a device for taking line pictures. In the figure, 4 is a high voltage generator, 5 is an X-ray generating tube, 6 is an X-ray diaphragm, and 7 is an X-ray.
Line grid, 8 film (contact plate) insertion / extraction mechanism, 9 image intensifier, 10 image pickup tube,
Reference numeral 11 is an X-ray monitor, and 12 is an operation panel.

FIG. 2 shows the top plate 1. On the back side of the top plate 1, a film contact plate 2 and a film cassette, which will be described later, are provided. The top plate 1 is required to have not only X-ray transparency but also strength enough to support the human body 3. Therefore, if the FRP according to the present invention is used for the structure of the top plate 1, good X-ray transparency is ensured, and the texture of the fabric in the FRP is recorded on the film photographed by the X-rays transmitted through the top plate 1. Can be prevented. And, in particular, the top plate 1 has a sandwich structure F as described above.
RP is preferable, and by adopting this structure, it is possible to easily secure necessary strength characteristics.

FIG. 3 shows the film contact plate 2,
An X-ray film is mounted in the contact plate 2. In particular, the front cover 21 provided on the side facing the X-ray source, that is, on the side where X-ray transparency is required, has the front cover 21 according to the present invention.
By configuring with RP, it is possible to prevent the eyes of the fabric in the FRP from appearing in the X-ray photograph.

The film contact plate 2 has a front cover 2 provided on the side facing the X-ray source, as shown in the schematic structure of FIG.
1 has a basic configuration in which an X-ray photography film 23 is inserted between the back cover 22 and the back cover 22. The film 23 pressing surface of the front lid 21 has a central portion protruding toward the film 23 in order to bring the film 23 into close contact with each other. For example, as shown in FIG. 5, this raised structure can be easily achieved by increasing the number of layers of the fabric 24 for FRP molding to increase in the central portion.

Since the reinforced fiber woven fabric according to the present invention uses a specific flat yarn, the crimp of the woven yarn in the woven state is extremely small and the surface smoothness when formed into FRP is good. It is also possible to improve the surface smoothness of the film contact surface of the film, and the film 23 can be mounted in a desired close contact state.

FIG. 6 shows an X-ray film cassette 31. This film cassette 31 has a front cover 32 provided on the side facing the X-ray source, and a box-shaped cover 32 that is opened and closed by a hinge 33 while forming a box body facing the front cover 32. It has a back cover 34. Three
5 is a cushion material, and the film 36 is mounted between the intensifying screen 37 and the front cover 32. It is preferable that the front cover 32 also has a bulged central portion on the film side.

Since the front cover 32 of the film cassette 31 is also required to have X-ray transparency, this portion can be formed by the FRP according to the present invention. Further, since the FRP has a specific flat yarn woven fabric, its cover factor is extremely high, and the eyes of the woven fabric are prevented from appearing when the X-ray photograph is taken. Moreover, since the surface smoothness of the molded FRP is good, the adhesion of the film is also good.

In each of the above embodiments, the top plate, the film contact plate, and the film cassette are shown as the members for the X-ray equipment. However, the present invention requires X-ray transparency even if other than these. Any member can be applied as long as it is a member for various X-ray equipment having a part to be cut.

[0035]

As described above, according to the member for X-ray equipment of the present invention, since the FRP formed by using the specific flat yarn woven fabric is included, the weight reduction and the strength increase can be achieved. At the same time, it is possible to prevent the eyes of the woven fabric in the FRP from appearing in the X-ray photograph, and further to improve the adhesion of the film due to the good surface smoothness.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an X-ray photography apparatus showing an example of a member for X-ray equipment which is an object of the present invention.

FIG. 2 is a perspective view of a top plate portion of FIG.

3 is an enlarged perspective view of the film contact plate of FIG.

FIG. 4 is a schematic configuration diagram of the film contact plate of FIG.

5 is a schematic configuration diagram of a front cover of the film contact plate of FIG.

FIG. 6 is a longitudinal sectional view of a film cassette according to an embodiment of the present invention.

[Explanation of symbols] 1 top plate 2 film contact plate 3 human body 21 front cover 22 back cover 23 film 24 woven fabric 31 film cassette 32 front cover 33 hinge 34 back cover 35 cushion material 36 film 37 intensifying screen

Claims (11)

[Claims] 1. A member for an X-ray device using a fiber reinforced plastic obtained by impregnating a plurality of layers of a reinforcing fiber material with a resin in an X-ray transmitting part, wherein at least one layer of the reinforcing fiber material has a single yarn width. Is a reinforced fiber woven fabric having a flattened reinforced fiber yarn having a yarn width / thickness ratio of 20 or more as at least one of warp yarns and weft yarns, wherein at least one of the warp yarns and the weft yarns is parallel to each other in a woven state. A member for X-ray equipment comprising a flat yarn woven fabric having a cover factor of 95 to 100%. 2. The cover factor is 98% to 100%.
The member for X-ray equipment according to claim 1, wherein 3. The warp yarn and the weft yarn are formed by laminating a plurality of the flat reinforcing fiber yarns at least one of the warp yarns and the weft yarns.
Or the member for X-ray equipment of 2. 4. The reinforcing fiber yarn is composed of carbon fiber yarn.
The member for X-ray equipment according to any one of claims 1 to 3. 5. The member for X-ray equipment according to claim 4, wherein the fabric weight is 100 to 700 g / m ² . 6. The member for X-ray equipment according to claim 1, wherein the reinforcing fiber yarn is an aramid fiber yarn. 7. The reinforcing fiber woven fabric has a twill structure.
The member for X-ray equipment according to any one of claims 1 to 6. 8. The member for X-ray equipment according to claim 1, which is a top plate. 9. The member for X-ray equipment according to claim 8, wherein the fiber-reinforced plastic is formed into a sandwich structure material provided on both surfaces of a core material made of foam. 10. The member for X-ray equipment according to claim 1, which is a film contact plate. 11. The member for X-ray equipment according to claim 1, which is a film cassette.