WO2010024352A1

WO2010024352A1 - Device for cleaning sheet-like member and method for manufacturing sheet-like member

Info

Publication number: WO2010024352A1
Application number: PCT/JP2009/064999
Authority: WO
Inventors: 厚中本; 宏祐酒井; 孝光田寺
Original assignee: シャープ株式会社
Priority date: 2008-08-27
Filing date: 2009-08-27
Publication date: 2010-03-04

Abstract

A device (1) for cleaning a sheet-like member is provided with a nozzle member (12), which has a suction port (15) at the leading end section and a nozzle port (18) wherein the distance (Hx) between the inner surfaces (19) facing in the thickness direction (Dh) of the sheet-like member becomes smaller as the nozzle port is away from the suction port (15). In a state where the suction port (15) is disposed in the vicinity of an end section of a sheet-like member (2) held by a holding section (11), a suction section (13) introduces a suction force to the suction port (15). An air current (20) which flows toward the inside of the nozzle member (12) from the external of the nozzle member (12) through a space between the nozzle member (12) and the sheet-like member (2) is generated with suction.

Description

Sheet-like member cleaning device and sheet-like member manufacturing method

The present invention relates to a sheet-like member cleaning device for cleaning a thin-film-like sheet-like member and a manufacturing method for producing a thin-film-like sheet-like member.

FIG. 15 is a perspective view showing a configuration of a conventional liquid crystal display 100. The liquid crystal display 100 of FIG. 15 includes a transmissive liquid crystal element 101 and an edge light type backlight 102. The backlight 102 is disposed on the back side of the liquid crystal element 101 and illuminates the back side of the liquid crystal element 101. The backlight 102 includes a light guide plate 103, a light source 104, an optical sheet 105, and a reflection plate 106. The light source 104 is, for example, a light emitting diode (Light-
Emitting Diode (abbreviated as LED).

A light source 104 is provided on one side surface of the light guide plate 103. A reflection plate 106 is provided on the other main surface side of the light guide plate 103. An optical sheet 105 is provided on one main surface side of the light guide plate 103. The optical sheet 105 is located between the light guide plate 103 and the liquid crystal element 101. The optical sheet 105 is a substantially rectangular sheet-like member, and is configured by laminating one or a plurality of sheet pieces 107 to 110. In the example of FIG. 15, four sheet pieces 107 to 110 of the front side diffusion sheet 107, the front side prism sheet 108, the back side prism sheet 109, and the back side diffusion sheet 110 are laminated in this order.

Light emitted from the light source 104 enters the light guide plate 103 from one side surface, exits from the other main surface of the light guide plate 103, and irradiates the liquid crystal element 101 through the optical sheet 105. The optical sheet 105 is configured so that the backlight 102 exhibits desired optical performance by appropriately diffusing and collecting illumination light emitted from the other main surface of the light guide plate 103. For example, the optical sheet 105 is configured so that the backlight 102 can uniformly illuminate the entire liquid crystal element 101.

Each of the sheet pieces 107 to 110 constituting the optical sheet 105 is generally manufactured by punching a raw material which is a long thin film material into a desired size or shape. As a method of punching the original fabric into a desired size or shape, for example, a method of punching the original fabric using a punching blade in which a product-shaped formwork is formed with a blade. As the punching blade, a Thomson type, a pinnacle type, a sculpture type or the like is used.

In the above-described punching method using the punching blade, the raw material is punched by pressing the entire surface of the punching blade with a press machine in a state where the punching blade is superposed on the raw material. In the optical sheet manufacturing process of the prior art, first, each sheet piece is punched into the desired size or shape by the punching method using the punching blade described above, and all the sheet pieces 107 to 110 are punched. After punching, an optical sheet is manufactured by laminating and stacking all the sheet pieces 107 to 110.

In contrast to the optical sheet manufacturing method described above, a method of punching out all the original fabrics at once in a state in which a plurality of original fabrics are previously overlapped and laminated can be considered. However, the latter method has the following difficulties as illustrated in FIGS. 11A and 11B. FIG. 16A is a schematic diagram showing a state in which the original sheet 112 of one diffusion sheet is cut by the punching blade 113. FIG. 16B is a schematic view showing a state of punching out a laminate 115 of a plurality of sheet pieces. In the example of FIG. 16B, a front side diffusion sheet original fabric 116, a front side prism sheet original fabric 117, a back side prism sheet original fabric 118, and a back side diffusion sheet original fabric 119 are laminated in this order.

In the case of FIG. 16A, the width d1 of the range in which the original sheet 112 of the diffusion sheet is cut remains in the range of the tip portion of the punching blade 113. In the example of FIG. 16B, when the thickness of the object to be cut increases, the original side 116 of the front diffusion sheet at the top of the laminate 115 is cut close to the root portion of the punching blade 113. Therefore, the width d2 of the range in which the raw fabric 116 of the front diffusion sheet is cut in the example of FIG. 16B is wider than the cutting range d1 shown in the example of FIG. 16A. As a result, the raw sheet 116 of the front diffusion sheet is greatly scraped by the side surface portion of the punching blade 113, so that the laminated structure of the laminated body 115 is crushed or foreign matter is generated. Moreover, the laminated body 115 may become unstable with respect to a press at the time of cutting | disconnection by the unevenness | corrugation of a prism sheet. This also makes it easier for foreign matter to occur during cutting.

As described above, in the cutting / punching process using a blade, foreign matter is generated during the manufacture of a sheet-like member such as an optical sheet, and the foreign matter remains on the main surface and the end surface of the sheet-like member. The foreign matter is generated even when a method other than the processing method using the blade, for example, a processing method using laser light is used. In addition to foreign matter on the sheet-like member main surface, foreign matter on the sheet-like member end face may fall off during product assembly using the sheet-like member and enter the product, resulting in the occurrence of defective products. Cause.

For example, Patent Document 1 below discloses a technique for cleaning the front and back main surfaces and the left and right end surfaces of a sheet-like member by using an adhesive roller. . In the technique of Patent Document 1, two pairs of adhesive rollers are prepared. The rotation axes of the two pairs of adhesive rollers are orthogonal to each other, and both are orthogonal to the conveying direction of the sheet-like member. The first adhesive roller pair sandwiches the sheet-like member in the thickness direction. The second adhesive roller pair sandwiches the sheet-like member in the width direction. The sheet-like member moves in the conveying direction, bringing the front and back main surfaces into contact with the first adhesive roller pair and bringing the left and right end surfaces into contact with the second adhesive roller pair. Accordingly, the first adhesive roller pair moves along the main surfaces of the front and back surfaces of the sheet-like member to remove foreign matters on the main surface, and the second adhesive roller pair moves along the left and right end surfaces of the sheet-like member. Move to remove foreign material on the end face.

JP 2007-155941 A

The cleaning method for the sheet-like member disclosed in Patent Document 1 is effective for cleaning the main surfaces of the front and back sides of the sheet-like member. However, it is effective only when the shape of the sheet-like member is substantially rectangular with respect to the left and right end faces of the sheet-like member. When the shape of the edge part of a sheet-like member is complicated, it is difficult to clean an end surface and its vicinity using the technique of patent document 1. FIG. For example, when there is a protrusion on the end surface of the sheet-like member, the protrusion interferes with the adhesive roller and cannot move along the end surface. For this reason, it becomes difficult to reliably remove the end surface and the foreign matter in the vicinity thereof.

In addition, since sheet-like members such as optical sheets are often very thin members, pressing the adhesive roller against the end face of the sheet-like member will deform the sheet-like member and push foreign objects into the sheet-like member. There are times when it ends up. Furthermore, when the sheet-like member is warped, it is difficult to clean correctly because the end face of the sheet-like member does not coincide with the surface position of the adhesive roller.

Further, in a nozzle having an opening portion with a high aspect ratio, the air flow is concentrated immediately after the suction portion is connected, and when it is separated, there is almost no air flow, and suction is performed with a uniform air flow over the entire width of the opening portion. It is difficult.

An object of the present invention is to provide a sheet-like member cleaning device and a sheet-like member manufacturing method capable of reliably cleaning the end face of the sheet-like member and the vicinity thereof regardless of the end face shape of the sheet-like member.

The present invention relates to a sheet-like member cleaning device for cleaning a sheet-like member,
A holding part for holding the sheet-like member;
A nozzle member having a suction port at the tip,
A suction part for guiding suction force to the suction port of the nozzle member,
In the vicinity of the end of the sheet-like member held by the holding part, the suction port of the nozzle member is disposed,
The said nozzle member is a sheet-like member cleaning apparatus characterized by having a nozzle hole which becomes so small that the space | interval between the inner surfaces which oppose the thickness direction of the said sheet-like member leaves | separates from the said suction port.

In the present invention, it is preferable that the nozzle member is formed such that a cross-sectional shape of an inner surface of the nozzle hole facing the thickness direction of the sheet-like member is tapered.

In the present invention, it is preferable that the nozzle member has an arcuate cross section on the inner surface of the nozzle hole facing the sheet member in the thickness direction.

In the present invention, the nozzle member is formed in a tubular shape,
The suction port of the nozzle member opens in a substantially rectangular shape larger than the end surface of the sheet-like member,
It is preferable that an end of one side of the sheet-like member is inserted into the nozzle member.

In the present invention, the nozzle member is
A bowl-shaped first nozzle part having an opening on the bottom surface;
A first nozzle component and a second nozzle component that is nested and has an opening on the bottom surface;
A suction port of the nozzle member is formed by the opening of the first nozzle part and the opening of the second nozzle part,
The sheet-like member is disposed between the first nozzle part and the second nozzle part,
It is preferable that the edge part of the perimeter of the said sheet-like member is inserted in the said nozzle member.

In the present invention, it is preferable that the sheet-like member cleaning device further includes a spraying portion that blows gas to the main surface of the sheet-like member when the suction portion is sucked.

In the present invention, it is preferable that the suction portion guides a suction force to the suction port of the nozzle member before the end portion of the sheet-like member is inserted into the nozzle member.

In the present invention, it is preferable that the flow rate of the gas flowing into the suction port of the nozzle member at the time of suction by the suction part is selected to be 6.0 m / second or more.

Further, in the present invention, the suction part guides a suction force to the suction port of the nozzle member by sending compressed gas into a space communicating with the nozzle hole in the suction part and discharging it.
The pressure of the compressed gas sent into the suction part is selected as 0.6 MPa, and the flow rate of the compressed gas is selected as 200 liters / minute,
The interval between the innermost ends of the nozzle holes on the inner surface of the nozzle member facing the thickness direction of the sheet-like member is selected to be less than 3.0 mm,
It is preferable that the amount of the sheet-like member inserted into the nozzle member is equal to or greater than the depth of the nozzle hole of the nozzle member.

In the present invention, it is preferable that the sheet-like member is formed in a substantially rectangular shape, and a convex portion is formed at an end of the sheet-like member.

In the present invention, it is preferable that the sheet-like member is composed of a laminate in which a plurality of sheet pieces are laminated.

In the present invention, it is preferable that the sheet-like member includes a diffusion sheet.

In the present invention, it is preferable that the sheet-like member includes a prism sheet.

In the present invention, the nozzle member has a discharge port through which a suction force from the suction unit is guided, and a current plate having a plurality of openings in the longitudinal direction is disposed between the discharge port and the suction port. It is preferable to install.

In the present invention, it is preferable that the area ratio of the plurality of openings provided in the rectifying plate is equal to the ratio of the distance from the outlet center to the center of each opening.

Further, in the present invention, it is preferable that the total area of the openings of the rectifying plate is equal to or smaller than the discharge port cross-sectional area.

In the present invention, the opening of the current plate is preferably larger than the object to be sucked.

In the present invention, the opening of the nozzle member preferably has an aspect ratio of 10 or more.

Furthermore, the present invention cuts the raw fabric into a predetermined shape to form a sheet-like member,
A cleaning step of cleaning an end face of the sheet-like member cut in the cutting step using a nozzle member having a suction port,
The cleaning step is characterized in that an air flow is generated by a gas flowing from a gap between an end portion of the sheet-like member and the suction port to remove cutting waste adhering to the end surface of the sheet-like member. It is a sheet-like member manufacturing method.

As described above, according to the present invention, the sheet-like member cleaning device cleans the sheet-like member held by the holding portion using the nozzle member and the suction portion. The nozzle hole at the tip of the nozzle member is formed such that the distance between the inner surfaces facing in the thickness direction of the sheet-like member decreases as the distance from the suction port at the tip increases.

In the state where the suction port of the nozzle member is disposed in the vicinity of the end of the sheet-like member being held, the suction unit guides the suction force to the suction port of the nozzle member. As a result, outside air is sucked into the nozzle member from the gap between the sheet-like member and the suction port, and an air flow from the outside of the nozzle member toward the inside of the nozzle member is generated. The airflow is guided to the internal shape of the nozzle hole of the nozzle member, flows along the main surface and the end surface of the end portion of the sheet-like member, and further flows in a direction away from the end surface. Therefore, the foreign matter adhering to the end portion of the sheet-like member, the end face, and the vicinity thereof is removed by the airflow.

Thus, the sheet-like member cleaning device of the present invention does not directly contact the nozzle member with the sheet-like member, unlike the prior art in which the adhesive roller is brought into contact with the end face. For this reason, no matter what the end surface shape of the sheet-like member is, the end surface of the sheet-like member and its vicinity can be reliably cleaned regardless of the end surface shape of the sheet-like member.

According to the present invention, in the sheet-like member cleaning device of the present invention, the nozzle hole of the nozzle member is formed so that the cross-sectional shape of the inner surface facing the thickness direction is tapered. Accordingly, the sheet-like member cleaning device can reliably generate an air flow that separates from the end surface from the outside through the main surface and end surface of the end portion of the sheet-like member, using a nozzle member having a simple configuration. . Therefore, regardless of the end face shape of the sheet-like member, the end face of the sheet-like member and its vicinity are reliably cleaned.

According to the present invention, in the sheet-like member cleaning device of the present invention, the nozzle hole of the nozzle member is formed such that the cross-sectional shape of the inner surface facing the thickness direction is an arc shape. Thereby, the said sheet-like member cleaning apparatus can produce reliably the airflow which leaves | separates from an end surface through the main surface and end surface of a sheet-like member edge part from the outside. Therefore, regardless of the end face shape of the sheet-like member, the end face of the sheet-like member and its vicinity are reliably cleaned.

According to the present invention, in the sheet-like member cleaning device of the present invention, the nozzle member is realized by a tubular member having a suction port as one end. And the suction port of the said nozzle member opens in the substantially rectangular shape larger than the end surface of the said sheet-like member. At the time of induction of the suction force to the suction port, at least a part of the end of the sheet-like member is inserted into the nozzle member from the suction port. As a result, during the suction force induction, the air flow from the outside to the inside of the nozzle member flows along the main surface and the end surface of the end portion into which the sheet-like member is inserted.

Therefore, the sheet-like member cleaning device can reliably clean at least a part of the end face of the sheet-like member and the vicinity thereof regardless of the end face shape of the sheet-like member. Moreover, since the space | interval of the inner surface of the said nozzle hole is so small that it leaves | separates from the said suction port, the sheet-like member cleaning apparatus of this invention can easily accommodate the edge part of a sheet-like member in a nozzle member. Thereby, the sheet-like member cleaning apparatus of the present invention can easily execute the cleaning of the sheet-like member.

According to the present invention, in the sheet-like member cleaning device of the present invention, the nozzle member is configured by combining a first nozzle part having a bowl shape and a second nozzle part having a bowl shape in a nested manner. The suction port of the nozzle member is formed by the opening on the bottom surface of the first nozzle component and the opening on the bottom surface of the second nozzle component. At the time of induction of suction force to the suction port, an end portion of the entire circumference of the sheet-like member is inserted into the nozzle member. As a result, when the suction force is induced, the air flow from the outside to the inside of the nozzle member flows through the main surface and the end surface of the entire periphery of the sheet-like member so as to be separated from the end surface of the entire periphery.

Therefore, the sheet-like member cleaning device can reliably and efficiently clean the entire end face of the sheet-like member regardless of the end face shape of the sheet-like member. Further, since the sheet-like member is positioned at the bottom of the nested first and second nozzle parts, the sheet-like member cleaning device is not only related to the end face shape of the sheet-like member but also to the main surface shape. Therefore, the end surface of the entire circumference of the sheet-like member and the vicinity thereof can be reliably and efficiently cleaned.

According to the present invention, the sheet-shaped member cleaning device of the present invention sprays gas on the main surface of the sheet-shaped member using the spraying portion during suction by the suction portion. Thereby, the whole sheet-like member is fixed, and the shift | offset | difference of the position in the cleaning apparatus of a sheet-like member is prevented. At the same time, the foreign material adhering to the main surfaces of the front and back surfaces of the sheet-like member is blown off and removed by blowing the gas onto the main surface. Therefore, the sheet-like member cleaning device of the present invention can improve the efficiency of the cleaning process of the sheet-like member.

According to the present invention, in the sheet-shaped member cleaning device of the present invention, suction force induction to the suction port starts before the end of the sheet-shaped member is inserted into the nozzle member. Therefore, the end of the sheet-like member is guided by the air flow generated along with the suction force induction, approaches the suction port of the nozzle member, and is inserted into the nozzle member. This facilitates cleaning of the sheet-like member, so that the end surface of the sheet-like member is reliably and easily cleaned. Also, this makes it easier for foreign matters on the main surface and end surface of the sheet-like member to be removed by dropping or escaping from before insertion. Therefore, the sheet-like member cleaning device of the present invention can more efficiently clean the end face of the sheet-like member and the vicinity thereof.

According to the present invention, in the sheet-like member cleaning device of the present invention, the flow velocity of the airflow flowing from the outside through the suction port into the nozzle member is 6.0 m / s or more during the suction of the suction portion. It is preferable to be selected. As a result, the foreign matter adhering to the end face of the sheet-like member is reliably removed by the air flow, so that the sheet-like member cleaning device of the present invention can reliably clean the end face of the sheet-like member and its vicinity. it can.

According to the present invention, in the sheet-like member cleaning device of the present invention, the gas in the nozzle member is sucked by sending and discharging the compressed gas to the space connected to the nozzle hole of the nozzle member. In the sheet-like member cleaning device having such a configuration, when the pressure of the compressed gas is selected to be 0.6 MPa and the flow rate of the compressed gas is selected to be 200 liters / min, the innermost end of the nozzle hole is The interval between the inner surfaces facing the thickness direction of the sheet-like member is selected to be less than 3.0 mm, and the insertion amount of the sheet-like member into the nozzle member is selected to be greater than the depth of the nozzle hole. preferable. Thereby, the end surface of the sheet-like member and the vicinity thereof are reliably cleaned.

According to the present invention, in the sheet-like member cleaning device of the present invention, the sheet-like member is formed in a substantially rectangular shape, and a convex portion is formed on an end surface of the sheet-like member. As described above, since the end surface is cleaned using an air flow, even when the end surface of the sheet-like member has a convex portion, the sheet-like member cleaning device of the present invention includes the end surface of the sheet-like member and its end surface. The vicinity can be reliably cleaned.

According to the present invention, in the sheet-like member cleaning device of the present invention, the sheet-like member is realized by a laminated body in which a plurality of sheet pieces are laminated. Since the end face is cleaned using an air flow, the sheet-like member cleaning device of the present invention cleans the end face and the vicinity thereof even in a laminate of a plurality of sheet pieces regardless of the shape of the end of the laminate. Can do.

Since the airflow flows in a direction away from the end face, foreign matter sandwiched between the laminated sheet pieces is removed using the airflow in the vicinity of the end face of the laminate. Thus, the sheet-like member cleaning device of the present invention can clean not only the end face of the laminate of a plurality of sheet pieces but also the inside of the laminate near the end face, so that the quality of the sheet-like member after cleaning is improved. Can be improved.

According to the present invention, in the sheet-like member cleaning device of the present invention, the sheet-like member includes a diffusion sheet used in a backlight or the like of a liquid crystal display device. Thereby, the sheet-like member cleaning device of the present invention can clean the end face and the vicinity thereof even in the sheet-like member including the diffusion sheet regardless of the shape of the end portion of the sheet-like member. Therefore, since the sheet-like member of the present invention can be used in the manufacturing process of the backlight, the product yield is improved in the manufacturing process.

According to the present invention, in the sheet-like member cleaning device of the present invention, the sheet-like member includes a prism sheet used in a backlight or the like of a liquid crystal display device. Thereby, the sheet-like member cleaning device of the present invention can clean the end face and the vicinity thereof even in the sheet-like member including the prism sheet regardless of the shape of the end of the sheet-like member. Therefore, since the sheet-like member of the present invention can be used in the manufacturing process of the backlight, the product yield is improved in the manufacturing process.

According to the present invention, the nozzle member has a discharge port through which a suction force from the suction unit is guided, and a current plate having an opening having a different opening ratio in the longitudinal direction between the discharge port and the suction port. Arrange. This disperses the flow of air concentrated on the discharge port and applies a suction force almost uniformly to the end of the sheet-like member, and reliably sucks and removes foreign matter adhering to the end and its vicinity. Can do.

According to the present invention, the ratio of the area ratio of each opening provided in the current plate to the distance from the center of the outlet to the center of each opening is equal. Moreover, the sum total of the area of each opening of a baffle plate is below an outlet sectional area. Thus, an air flow having a uniform flow velocity can be formed over the entire width of the opening, and suction can be performed by applying a uniform suction force to the end of the sheet-like member and the vicinity thereof.

According to the present invention, the opening area of each opening of the current plate is formed larger than the foreign matter that is the object to be sucked. As a result, foreign matter can be prevented from being clogged due to the rectifying plate being attached, and foreign matter can be reliably sucked and removed.

According to the present invention, the suction port of the nozzle member has an aspect ratio of 10 or more. By adopting such a configuration, even if the width of the end portion of the sheet-like member is large, the foreign matter adhering to the end surface and its vicinity can be reliably removed.

According to the present invention, the sheet-like member manufacturing method includes a cutting step of forming a sheet-like member by cutting a long sheet original fabric into a predetermined shape, and a cleaning step of cleaning an end surface of the sheet-like member. including. In particular, the cleaning step uses a nozzle member having a suction port, generates an air flow by a gas flowing from a gap between the end surface of the sheet-like member and the suction port, and the sheet-like member end surface during the cutting step The cutting waste adhering to is removed from the end face and the vicinity thereof using the airflow. Accordingly, the sheet-like member manufacturing method of the present invention can reliably remove the end face of the sheet-like member and the cutting waste in the vicinity thereof regardless of the shape of the end face of the sheet-like member. Can improve the quality.

According to the present invention, in the sheet-shaped member manufacturing method of the present invention, the sheet-shaped member is realized by a substantially rectangular member, and a convex portion is formed on the end surface of the sheet-shaped member. As described above, in the sheet-like member manufacturing method, the end face and its vicinity are reliably cleaned regardless of the shape of the end of the sheet-like member. Therefore, even when the end of the sheet-like member has a convex portion, the sheet-like member manufacturing method can improve the quality of the manufactured sheet-like member.

According to the present invention, in the sheet-shaped member manufacturing method of the present invention, the sheet-shaped member is realized by a laminated body in which a plurality of sheet pieces are stacked. In the sheet-like member manufacturing method of the present invention, as described above, the end face and the vicinity thereof are surely cleaned regardless of the shape of the end of the laminate. Moreover, in the sheet-like member manufacturing method of the present invention, foreign matter sandwiched between the laminated sheet pieces in the vicinity of the end face of the laminate can be removed using the airflow. By these, the sheet-like member manufacturing method of this invention can improve the quality of the manufactured sheet-like member more.

According to the present invention, in the sheet-shaped member manufacturing method of the present invention, the sheet-shaped member includes a diffusion sheet used in a backlight or the like of a liquid crystal display device. Thereby, since the sheet-like member manufacturing method of the present invention can reliably clean the end surface and the vicinity thereof regardless of the shape of the end portion of the sheet-like member when manufacturing the sheet-like member including the diffusion sheet. The quality of the sheet-like member can be further improved.

According to the present invention, in the sheet-shaped member manufacturing method of the present invention, the sheet-shaped member includes a prism sheet used in a backlight or the like of a liquid crystal display device. Thereby, since the sheet-like member manufacturing method of the present invention can reliably clean the end face and the vicinity thereof regardless of the shape of the end of the sheet-like member when manufacturing the sheet-like member including the prism sheet. The quality of the sheet-like member can be further improved.

Objects, features, and advantages of the present invention will become more apparent from the following detailed description and drawings.
It is sectional drawing which shows the structure of the sheet-like member cleaning apparatus of one Embodiment of this invention. It is a perspective view which shows the external appearance of the sheet-like member cleaning apparatus of FIG. It is a perspective view which shows the external appearance of the sheet-like member 2 handled by the sheet-like member cleaning apparatus of FIG. It is a perspective view for demonstrating the structure of the verification experiment of the cleaning effect of the sheet-like member cleaning apparatus of FIG. It is sectional drawing of the sheet-like member cleaning apparatus for demonstrating the various parameters in the verification experiment of FIG. In the verification experiment of FIG. 4, it is an enlarged photograph which shows the state before and behind cleaning of the end surface of the sheet-like member to be cleaned. In the verification experiment of FIG. 4, it is an enlarged photograph which shows the state before and behind cleaning of the end surface of the sheet-like member to be cleaned. It is sectional drawing which shows the structure of the sheet-like member cleaning apparatus which is other embodiment of this invention. It is a perspective view which shows the external appearance of the sheet-like member cleaning apparatus of FIG. It is a perspective view which shows the external appearance of the sheet-like member cleaning apparatus of FIG. It is a perspective sectional view of the sheet-like member cleaning device of FIG. It is sectional drawing which shows the structure of the nozzle member of other embodiment of this invention. It is explanatory drawing explaining the opening part of a baffle plate. It is explanatory drawing explaining the opening part of a baffle plate. It is an experimental result which shows the effect of a baffle plate. It is explanatory drawing explaining the opening part of the baffle plate of further another embodiment of this invention. It is explanatory drawing explaining the opening part of the baffle plate of other 5 embodiment of this invention. It is explanatory drawing explaining the opening part of the baffle plate of other 5 embodiment of this invention. It is a perspective view which shows the structure of the liquid crystal display of a prior art. It is the schematic showing a mode that the original fabric of a diffusion sheet is cut | disconnected with a punching blade. It is the schematic showing a mode that the original fabric of a diffusion sheet is cut | disconnected with a punching blade.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing a configuration of a sheet-like member cleaning device 1 according to an embodiment of the present invention. FIG. 2 is a perspective view showing an appearance of the sheet-like member cleaning device 1 of FIG. FIG. 1 shows a cross section viewed from the section line AA of FIG. The sheet-like member cleaning device 1 cleans at least a part of the end surface 3 of the sheet-like member 2 and the vicinity thereof.

The sheet-like member 2 that is an object to be processed is a thin-film or plate-like member. In the example of FIG. 1, the sheet-like member 2 is a thin film-like member having a substantially rectangular main surface 4, and one end face 3 of the four sides of the sheet-like member 2 is a cleaning target. In the example of FIG. 1, the sheet-like member 2 is a laminate of a plurality of sheet pieces 5 to 8 as shown in FIG. 3, and a convex portion 9 is formed on a part of the end surface 3.

The configuration of the sheet-like member cleaning apparatus 1 according to the first embodiment will be described below with reference to FIGS. 1 and 2. The sheet-like member cleaning device 1 in FIG. 1 includes at least a holding unit 11, a nozzle member 12, and a suction unit 13. The holding unit 11 holds the sheet-like member 2 that is an object to be processed. The nozzle member 12 has a suction port 15 at the tip. The suction unit 13 guides suction force to the suction port 15 of the nozzle member 12.

Specifically, the nozzle member 12 has an internal space 17 that leads from the suction port 15 on the front end side to the discharge port 16 on the rear end side. A nozzle hole 18 is formed at the tip of the internal space 17. The nozzle holes 18 are formed so that the distance between the inner surfaces 19 facing the sheet thickness direction Dh decreases as the distance from the suction port increases. That is, the distance Hx in the sheet thickness direction Dh of the inner surface 19 of the nozzle hole 18 of the nozzle member 12 is the largest at the suction port 15 and decreases as the distance from the suction port 15 approaches the discharge port 16. The sheet thickness direction Dh is the thickness direction of the sheet-like member 2 being held, and is a direction substantially parallel to the end surface 3 to be cleaned. The suction part 13 is configured to be able to suck the gas in the internal space 17 of the nozzle member 12.

The holding part 11 holds the sheet-like member 2 so that the portion to be cleaned of the end surface 3 of the entire circumference of the sheet-like member 2 is not bound. The suction port 15 of the nozzle member 12 is disposed in the vicinity of the end portion including the end surface 3 to be cleaned of the sheet-like member 2 being held. That is, the nozzle member 12 does not closely contact the suction port 15 and the inner surface 19 anywhere on the front and back main surfaces 4 and the end surface 3 of the entire circumference of the sheet-like member 2, and is only brought close to the nozzle member 12 in a non-contact state. Maintained. With the suction port 15 approaching the end of the sheet-like member 2, the suction unit 13 guides the suction force to the suction port 15 of the nozzle member 12.

In the sheet-like member cleaning device 1 in FIG. 1, the suction port 15 of the nozzle member 12 is kept in close contact with the end of the sheet-like member 2 without being in close contact with the sheet-like member 2. There is a gap. When the suction force is guided to the suction port 15 in the above-described state, the outside air is sucked into the nozzle member 12 from the gap between the sheet-like member 2 and the suction port 15, and the nozzle member 12 inside from the nozzle member 12 outside. An air flow 20 is generated. Further, since the interval in the sheet thickness direction Dh of the nozzle hole 18 of the nozzle member 12 is reduced from the suction port 15 toward the back, the above-described air flow 20 is obstructed at the end of the sheet-like member 2 at all. Instead, it flows in a direction from the central portion of the main surface 4 toward the end surface 3, and further flows in a direction away from the end surface 3. As a result, the foreign matter adhering to the end surface 3 at the end of the sheet-like member 2 and the main surface 4 in the vicinity thereof is removed by the airflow 20 described above.

Thus, the sheet-like member cleaning device 1 of the present embodiment cleans the end surface 3 of the sheet-like member 2 using the airflow 20 by suction. Unlike the prior art in which an adhesive roller is brought into contact with the end face of the sheet-like member, the sheet-like member cleaning device 1 according to this embodiment does not directly contact the nozzle member 12 with the sheet-like member 2. For this reason, regardless of the shape of the end portion of the sheet-like member 2, the end surface 3 of the sheet-like member 2 can be reliably cleaned regardless of the end face shape of the sheet-like member 2.

In the sheet-like member cleaning apparatus 1 according to the first embodiment, the nozzle member 12 is realized by a substantially tubular member having the suction port 15 as one end, and the suction port 15 of the nozzle member 12 cleans the sheet-like member 2. This is realized by a substantially rectangular opening larger than the target end face 3. At the time of suction of the nozzle member 12, at least a part of the end portion of the sheet-like member 2 including the end surface 3 to be cleaned is inserted into the internal space 17 of the nozzle member 12 from the suction port 15. Therefore, during the suction, the air flow 20 from the outside to the inside of the nozzle member 12 flows through a narrow gap between the inner surface 19 of the nozzle hole 18 of the nozzle member 12 and the sheet-like member 2, and thus the sheet-like member 2. Flows along the inserted end. Thereby, the sheet-like member cleaning device 1 can reliably clean at least a part of the end face 3 of the sheet-like member 2 regardless of the end face shape of the sheet-like member 2.

Further, the distance Hx in the sheet thickness direction Dh of the inner surface 19 of the nozzle hole 18 of the nozzle member 12 decreases as the distance from the suction port 15 decreases. For example, it is formed in a quadrangular frustum shape with an aspect ratio of 10 or more. Therefore, the inner surface 19 serves as a guide for the sheet-like member 2 when the end of the sheet-like member 2 is inserted. Thereby, for example, even when the sheet-like member 2 is warped, the sheet-like member cleaning device 1 of the first embodiment can easily place the end of the sheet-like member 2 in the suction port 15 of the nozzle member 12 in a non-contact state. Therefore, the end face 3 can be easily cleaned by reliably applying a suction force to the entire end portion of the sheet-like member 2.

In the sheet-like member cleaning device 1 according to the first embodiment, preferably, the suction portion 13 is the nozzle member before the end portion including the end surface 3 to be cleaned of the sheet-like member 2 is inserted into the nozzle member 12. Begin to draw suction to 12 As a result, the end of the sheet-like member 2 is guided by the airflow 20 generated along with the suction force induction, approaches the suction port 15 of the nozzle member 12, and is inserted into the nozzle member 12.

It is generally difficult to insert the end of the thin sheet-like member 2 into the relatively narrow suction port 15. By starting the suction operation before the insertion, the end portion of the sheet-like member 2 is guided by the air flow 20 accompanying the suction force induction, and easily approaches the suction port 15 of the nozzle member 12, and the inside of the nozzle member 12. Surely pulled into. Thereby, since the cleaning operation of the sheet-like member 2 is facilitated, the sheet-like member cleaning device 1 of the first embodiment can reliably and easily clean the end surface 3 of the sheet-like member 2.

In addition, when the suction force induction is started before the insertion, the air flow 20 accompanying the suction force induction is mainly generated at the end of the sheet-like member 2 before the end of the sheet-like member 2 is inserted into the nozzle member 12. It contacts the surface 4 and the end surface 3. As a result, foreign matters on the main surface 4 and the end surface 3 of the sheet-like member 2 are easily removed by falling or escaping, so the sheet-like member cleaning device 1 cleans the end surface 3 of the sheet-like member 2 more efficiently. be able to. Furthermore, since the sheet-like member cleaning apparatus 1 does not require a separate mechanism for guiding the sheet-like member, the configuration is simplified.

In the sheet-like member cleaning device 1 of the first embodiment, the number of nozzle members 12 is not limited to one, and a plurality of nozzle members 12 may be provided. When a plurality of nozzle members 12 having the above-described configuration are prepared, the sheet-like member cleaning device 1 draws a plurality of locations on the end surface 3 of the sheet-like member 2 into each nozzle member 12, and the suction port 15 of each nozzle member 12. Induction force is induced respectively. Thereby, the sheet-like member cleaning apparatus 1 can clean the sheet-like member 2 more efficiently.

In the sheet-like member cleaning apparatus 1 according to the first embodiment, the cross-sectional shape of the inner surface 19 of the nozzle hole 18 of the nozzle member 12 is suctioned in a virtual plane orthogonal to the main surface 4 of the sheet-like member 2 and the end surface 3 to be cleaned. A nozzle hole 18 is formed so as to taper toward the downstream side in the direction. That is, the inner surface 19 of the nozzle hole 18 of the nozzle member 12 is chamfered, and the inner surface 19 of the nozzle hole 18 has a flat slope. As a result, the sheet-like member cleaning device 1 causes a region of lower pressure than the airflow 20 just before the downstream side of the end surface 3 by the airflow 20 that is separated from the end surface 3 through the end of the sheet-like member 2 from the outside. Thus, it is possible to reliably generate a suction force using the nozzle member 12 having a simple configuration. Therefore, regardless of the shape of the end of the sheet-like member 2, the end surface 3 of the sheet-like member 2 and the vicinity thereof are reliably cleaned. Moreover, since the inner surface 19 of the nozzle hole 18 of the nozzle member 12 can be formed by simple processing such as chamfering, the sheet-like member cleaning device 1 can be easily realized.

Further, the sheet-like member cleaning apparatus 1 according to the first embodiment has a cross-sectional shape of the inner surface 19 of the nozzle hole 18 of the nozzle member 12 in a virtual plane orthogonal to the main surface 4 of the sheet-like member 2 and the end surface 3 to be cleaned. May be formed in an arc shape. That is, the inner surface 19 of the nozzle hole 18 of the nozzle member 12 is chamfered, and the inner surface 19 of the nozzle hole 18 is curved. Also by this, the sheet-like member cleaning device 1 can surely generate the air flow 20 described above, so that the end face 3 of the sheet-like member 2 and the vicinity thereof can be reliably obtained regardless of the end face shape of the sheet-like member 2. Can be cleaned.

In the sheet-like member cleaning apparatus 1 of the first embodiment, the sheet-like member 2 may be realized by a single sheet piece having a predetermined shape, and a plurality of sheet pieces 5 to 8 having a predetermined shape are laminated. It may be realized by a laminated body constituted. When the sheet-like member 2 is the laminated body, the suction port 15 in a state where the end face 3 constituted by each end face portion of the plurality of sheet pieces 5 to 8 in the sheet-like member 2 is inserted into the nozzle member 12. The suction force is guided to. Thus, even when the sheet-like member cleaning device 1 is realized by a laminate of a plurality of sheet pieces 5 to 8, the end face 3 can be cleaned regardless of the shape of the entire end face 3 of the laminate. .

Furthermore, in the sheet-like member cleaning device 1 of the first embodiment, an airflow 20 in a direction away from the end surface 3 is generated when the suction force is induced. Therefore, the sheet-like member cleaning device 1 can remove the foreign matter in the low pressure region due to the airflow 20 even when the foreign matter is sandwiched between the laminated sheet pieces 5 to 8 in the vicinity of the end surface 3 of the laminated body. Can be sucked and removed from between the sheet pieces 5-8. Accordingly, the sheet-like member cleaning device 1 can clean not only the end face 3 of the laminate of the plurality of sheet pieces 5 to 8 but also the inside of the laminate near the end face 3, and thus the sheet-like member 2 after cleaning is cleaned. The quality of the can be further improved.

As described with reference to FIG. 3, the sheet-like member 2 that is the object to be processed is realized by a substantially rectangular member, and the convex portion 9 is formed on the end surface 3 of the sheet-like member 2. Since the sheet-like member cleaning apparatus 1 according to the first embodiment performs end face cleaning using the airflow 20, the end face 3 can be cleaned regardless of the shape of the end portion of the sheet-like member 2. Therefore, even when the end surface 3 of the sheet-like member 2 has the convex portion 9, the sheet-like member cleaning device can reliably clean the end surface 3 of the sheet-like member 2. That is, even if the end surface 3 of the sheet-like member 2 is not flat but has a complicated shape, the end surface 3 of the sheet-like member 2 is reliably cleaned.

The configuration of the sheet-like member cleaning device according to the first embodiment will be described in more detail with reference to FIGS. As shown in FIG. 3, the sheet-like member 2 is a laminated body in which a plurality of sheet pieces 5 to 8 are sequentially laminated.

The nozzle member 12 is for cleaning the end of the sheet-like member 2 in the sheet-like member cleaning device 1. In the nozzle member 12, the distance Hx between the inner surfaces 19 of the nozzle holes 18 facing the sheet thickness direction Dh is narrowed from the suction port 15 toward the discharge port 16. As a result, when the end of the sheet-like member 2 is sucked, the outside air is sucked from a slight gap between the sheet-like member 2 and the nozzle member 12, and the foreign matter is removed by the airflow 20 by suction. is there. Moreover, the sheet-like member cleaning apparatus 1 can have a plurality of nozzle members 12 and can also clean the end surfaces 3 on both sides of the sheet-like member 2 at a time.

The discharge port 16 on the rear end side of the nozzle member 12 is connected to the suction unit 13. As the suction unit 13, various conventionally known suction units can be used.

The holding unit 11 is a member for preventing the sheet-like member 2 from moving when the sheet-like member 2 is cleaned by the nozzle member 12. In the example of FIG. 1, the holding portion 11 is realized by a pair of rod-shaped members whose tips are rounded, and the tips of the pair of rod-shaped members are configured to be able to approach / separate from each other.

The place where the holding part 11 holds the sheet-like member 2 is preferably the central part of the main surface 4 of the sheet-like member 2 as shown. The holding place of the holding portion 11 is not particularly limited to the example of FIG. 1, and any portion on the surface of the sheet-like member 2 may be held as long as the sheet-like member 2 does not move. Further, the number of holding places may be not only one as shown, but also a plurality of places.

It is desirable to use a material that does not damage the sheet-like member 2 at the portion where the holding portion 11 and the sheet-like member 2 are in contact with each other. Examples of the material described above include materials such as nitrile rubber.

The sheet-like member cleaning device 1 can be equipped with a plurality of nozzle members 12 and holding portions 11 and can clean a large number of sheet-like members 2. Of course, the sheet-like member cleaning device 1 can also be used for cleaning a single-layer sheet.

Subsequently, how the sheet-like member cleaning device 1 of the first embodiment operates will be described below. The sheet-like member cleaning device 1 in FIG. 1 includes a transport unit 22, a holding drive unit 23, and a nozzle drive unit 24 in addition to the holding unit 11, the nozzle member 12, and the suction unit 13.

In the initial state, the distance between the tips of the pair of rod-like members of the holding portion 11 is larger than the thickness of the sheet-like member 2. First, the sheet-like member 2 is conveyed between the pair of rod-like members of the holding unit 11 by the conveyance unit 22. Various conventionally well-known things can be applied to the conveyance part 22, for example, the thing by a robot hand is mentioned.

When the sheet-like member 2 is conveyed between the holding portions 11, the holding drive portion 23 operates the holding portion 11 so that the holding portion 11 holds the central portion of the main surface 4 of the sheet-like member 2 and moves. Fix so that there is no. This prevents the sheet-like member 2 itself from being sucked into the nozzle member 12 during end face cleaning, and prevents the position of the sheet-like member 2 from deviating from the held position.

When the sheet-like member 2 is held by the holding unit 11, the nozzle driving unit 24 causes the nozzle member 12 to relatively approach from the end surface 3 side of the sheet-like member 2, and the end of the sheet-like member 2 is moved to the nozzle member 12. Fit inside. The suction part 13 guides the suction force to the suction port 15 of the nozzle member 12 after the end part storage or before the end part storage. As a result, outside air is sucked from a slight gap between the sheet-like member 2 and the nozzle member 12, and a low-pressure region is generated on the downstream side of the end surface 3 of the sheet-like member 2 by the air flow 20 accompanying the suction. And the foreign matter adhering to the vicinity thereof is removed. In addition, the end surface 3 of the stacked sheet pieces 5 to 8 in the sheet-like member 2 and the internal foreign matter in the vicinity thereof can also be removed by the airflow 20 described above. As a result, the end surface 3 of the sheet-like member 2 to be cleaned and the portions near the end surface 3 of the front and back main surfaces 4 are cleaned.

The sheet-like member 2 according to the first embodiment will be described below. As shown in FIG. 3, the sheet-like member 2 is a laminated body in which a plurality of sheet pieces 5 to 8 are sequentially laminated. More specifically, the sheet-like member 2 is realized by an optical sheet used in a backlight of a liquid crystal display device. The optical sheet preferably includes at least one sheet piece of a diffusion sheet and a prism sheet. The diffusion sheet is a sheet piece for diffusing light to make the luminance distribution uniform. The prism sheet is a sheet piece for collecting light and increasing the front luminance.

That is, in the first embodiment, the sheet-like member 2 may be realized as a single diffusion sheet, or may be realized as a laminate of sheet pieces including at least one diffusion sheet. Or the sheet-like member 2 may be implement | achieved by the single-piece | unit prism sheet, and may be implement | achieved by the laminated body of the sheet piece containing at least 1 piece of prism sheet. In the example of FIG. 3, the front side diffusion sheet 5, the front side prism sheet 6, the back side prism sheet 7, and the back side diffusion sheet 8 are sequentially laminated in the sheet-like member 2.

As a result, the sheet-like member cleaning device 1 according to the first embodiment also includes the sheet-like member 2 including at least one of the diffusion sheet and the prism sheet, regardless of the shape of the end portion near the end surface 3 of the sheet-like member 2. The end surface 3 can be cleaned. Therefore, since the sheet-like member cleaning apparatus 1 of the first embodiment can be used in the manufacturing process of the backlight, the product yield can be improved in the manufacturing process.

The sheet-like member cleaning device 1 according to the first embodiment described above is used, for example, in a manufacturing process for producing the sheet-like member 2. The manufacturing process includes, for example, a cutting process and a cleaning process. In the cutting step, the sheet-like member 2 is formed by cutting an original fabric, which is a long thin film material, into a predetermined shape. In the cleaning step, the end surface 3 of the sheet-like member 2 formed in the cutting step and the vicinity thereof are cleaned using the sheet-like member cleaning device 1. Specifically, in the cleaning process, the nozzle member 12 having the suction port 15 is used, and an air flow 20 is generated so that gas flows in from a gap between the end surface of the sheet-like member 2 and the suction port 15. As a result, cutting waste adhering to and near the end surface 3 of the sheet-like member 2 during the cutting step is removed from the end surface 3 and the vicinity thereof by the low-pressure region generated on the downstream side of the end surface 3 by the airflow 20. .

When the sheet-like member 2 is formed by cutting the original fabric, foreign matters such as cutting dust are likely to adhere to the end surface 3 of the sheet-like member 2 that is a cut surface. When the sheet-like member cleaning device 1 according to the first embodiment is used, the end surface 3 of the sheet-like member 2 is cleaned using the airflow 20 described above, so that the sheet-like shape is used regardless of the shape of the end of the sheet-like member. The cutting waste on the end surface 3 of the member 2 can be reliably removed. Thereby, in the said manufacturing process, the quality of the sheet-like member 2 manufactured can be improved rather than a prior art. In addition, when the sheet-like member 2 manufactured in the manufacturing process is used for a product such as a backlight, the sheet-like member 2 with less foreign matter is provided, so that the yield of the product can be improved.

The sheet-like member manufactured in the manufacturing process may be realized by, for example, a member having a substantially rectangular shape on the main surface 4, and the protrusion 9 may be formed on the end surface 3. In the manufacturing process, the end surface 3 and the vicinity thereof are surely cleaned regardless of the shape of the end portion of the sheet-like member 2, so that even when the end surface 3 of the sheet-like member 2 has the convex portion 9, The quality of the sheet-like member 2 manufactured in the manufacturing process is improved.

Further, the sheet-like member manufactured in the manufacturing process may be a laminated body in which a plurality of sheet pieces 5 to 8 are stacked. When the sheet-like member 2 is the laminated body, for example, a plurality of original fabrics are preliminarily overlapped, and the stacked body is formed by cutting the overlapped original fabrics at a time. Foreign matters are more likely to occur when the sheet-like member 2 is the laminated body than when the sheet-like member 2 is a single sheet piece.

In the manufacturing process, the end surface 3 of the sheet-like member 2 is cleaned using the airflow 20 described above, so that even if the sheet-like member 2 is the laminate, the end surface is independent of the shape of the end of the laminate. 3 is reliably cleaned. Further, foreign matter sandwiched between the laminated sheet pieces 5 to 8 in the vicinity of the end surface 3 of the laminated body can also be removed using the airflow 20 described above. Thereby, in the manufacturing process, not only the end surface 3 of the sheet-like member 2 that is the laminate but also the inside of the laminate near the end surface 3 can be cleaned, so that the quality of the manufactured sheet-like member 2 can be improved. Can be improved.

In the manufacturing process, specifically, the sheet-like member 2 which is an optical sheet including at least one sheet piece of a diffusion sheet and a prism sheet is manufactured. Thereby, in the manufacturing process, the end surface 3 and the vicinity thereof can be reliably cleaned regardless of the shape of the end portion of the sheet-like member 2, so that the quality of the sheet-like member 2 can be further improved. Moreover, when the manufacturing process of the said sheet-like member 2 is integrated in the manufacturing process of the said backlight, the quality of backlight itself can be improved and a yield can be improved.

FIG. 4 is a perspective view showing an appearance of the sheet-like member cleaning device 1 for explaining the cleaning effect verification experiment of the first embodiment. FIG. 5 is a cross-sectional view of the sheet-like member cleaning apparatus 1 for explaining various parameters in the verification experiment of FIG. With reference to FIG. 4 and FIG. 5, the cleaning effect of the sheet-like member cleaning apparatus 1 of 1st Embodiment is demonstrated below. In the verification experiment, it was examined whether foreign matters having a particle diameter of 50 μm or more can be removed from the end surface 3 of the sheet-like member 2.

In the verification experiment, as shown in FIG. 4, the suction part 13 has an internal space 27 inside, and the internal space 27 of the suction part has three connection ports that communicate with the external space. The first connection port of the internal space 27 of the suction unit 13 is connected to the discharge port 16 of the nozzle member 12. Therefore, the internal space 27 of the suction part 13 is connected to the internal space 17 of the nozzle member 12. The second connection port of the internal space 27 of the suction unit 13 serves as a gas discharge port in the internal space 27. The third connection port of the internal space 27 of the suction unit 13 serves as an inlet for the compressed gas for driving into the internal space 27.

When compressed gas is sent into the internal space 27 of the suction unit 13 from the third connection port, an air flow is generated in the internal space 27 so that the gas in the internal space 27 is discharged from the second connection port. Along with the generation of the air flow, an air flow is generated in the internal space 27 such that outside air is sucked from the first connection port and discharged from the second connection port. As a result, the gas in the internal space 17 of the nozzle member 12 passes through the internal space 27 of the suction portion 13 and is discharged to the outside from the second connection port of the suction portion 13. As a result, an air flow 20 is generated from the outside toward the inside of the nozzle member 12 through the suction port 15 of the nozzle member 12.

In the verification experiment, specifically, an air gun (OSAWA W301: manufactured by Osawa Corporation) is used as the suction unit 13. Compressed air is used as the compressed gas to the suction unit 13. In general, it is preferable to use a compressor having a capability of compressing the generated compressed gas to a pressure of 0.5 MPa to 0.7 MPa at a maximum. . The use of a compressor having a capacity exceeding the above-mentioned range causes an increase in cost for realizing the cleaning device. For this reason, in the verification experiment, the general compressor whose maximum pressure of the compressed gas is 0.6 MPa is used as the suction unit 13. Therefore, in the verification experiment, the pressure of the compressed gas to the suction unit 13 is selected to be the maximum value of 0.6 MPa. When a compressed gas having a pressure of 0.6 MPa was passed through the above-mentioned air gun (OSAWA W301), it was confirmed by measuring with a flow meter that the flow rate of the compressed gas was approximately 200 liters / min, that is, 0.2 m ³ / min. .

Further, in the verification experiment, the sheet-like member 2 that is the object to be processed is realized by a laminate composed of four sheet pieces. As the sheet-like member 2 used in the verification experiment, an optical sheet actually used in a liquid crystal display device is used. Therefore, the layer thickness T of the sheet-like member 2 used in the verification experiment is selected to be 0.18 mm.

Furthermore, the inner surface 19 of the nozzle hole 18 of the nozzle member 12 is tapered, and the nozzle angle θ is selected to be 40 degrees. The nozzle angle θ is an inclination angle of the inner surface 19 of the nozzle hole 18 with respect to the central axis direction Dv of the nozzle member 12, and corresponds to a chamfering angle of the inner surface 19 with respect to the central axis of the nozzle member 12. The central axis direction Dv is a direction parallel to the central axis of the nozzle hole 18 of the nozzle member 12 and is substantially parallel to the normal line of the end surface 3 to be cleaned of the sheet-like member 2 being held.

When the sheet-like member 2 that is actually used in the verification experiment is gripped, the sheet-like member 2 sags. The amount of sag produced is about 5 mm. In order to put the sheet-like member 2 with 5 mm sagging into the nozzle member 12, the nozzle angle had to be 40 degrees. Actually, the amount of sagging of the sheet-like member 2 varies depending on the material, thickness, size, gripping position, distance between nozzles, and nozzle outer shape of the sheet-like member 2, and in response to the sagging amount change. The nozzle angle θ also changes.

In the verification experiment, as shown in FIG. 5, the taper depth L of the nozzle member 12, the inter-nozzle distance He, and the insertion amount Ai of the sheet-like member 2 into the nozzle member 12 are selected as parameters to be varied. ing.

The taper depth L is the width in the central axis direction Dv of the nozzle hole 18 of the nozzle member 12 and is equal to the width from the suction port 15 to the innermost end of the inclined portion of the inner surface 19. The taper depth L is set in increments of 1.0 mm within a range of 2.0 mm to 3.0 mm.

The inter-nozzle distance He is a distance in the sheet thickness direction Dh of the inner surface 19 at the innermost end of the nozzle hole 18 of the nozzle member 12 and a width in the sheet thickness direction Dh of the narrowest portion of the nozzle hole 18. In the example of FIG. 5, the width of the nozzle hole 18 of the nozzle member 12 in the sheet thickness direction Dh decreases from the suction port 15 toward the back, and is minimum at the innermost end of the nozzle hole 18. The inter-nozzle distance He is set in increments of 2.0 mm within a range of 1.0 mm to 3.0 mm.

The insertion amount Ai of the sheet-like member 2 is determined by the suction of the nozzle member 12 from the end surface 3 of the sheet-like member 2 inside the nozzle member 12 in a state where the end of the sheet-like member 2 is inserted into the nozzle member 12. This is the width in the central axis direction Dv to the mouth 15. The insertion amount Ai is set in increments of 1.0 mm within a range of 0.0 mm to 5.0 mm.

Table 1 is a table showing the results of a verification experiment performed by changing the inter-nozzle distance He and the sheet member insertion amount Ai within the above ranges when the taper depth L is selected to be 2.0 mm. is there. Table 2 is a table showing the results of a verification experiment performed by changing the inter-nozzle distance He and the sheet member insertion amount Ai within the above ranges when the taper depth L is selected to be 3.0 mm. is there. In Tables 1 and 2, “◯” indicates that the foreign matter has been sufficiently removed from the sheet-like member 2, and “X” indicates that the foreign matter has not been sufficiently removed from the sheet-like member 2.

As shown in Tables 1 and 2, when the compressed gas pressure and flow rate and the nozzle angle θ are selected as described above, the end face 3 of the sheet-like member 2 is such that the inter-nozzle distance He is 3.0 mm or more. It was difficult to sufficiently remove foreign matter from When the inter-nozzle distance He is 1.0 mm under the above-described conditions, the end surface 3 of the sheet-like member 2 may be able to be cleaned. Further, when the pressure and flow rate of the compressed gas and the nozzle angle θ are selected as described above and the inter-nozzle distance He is selected to be 1.0 mm, if the insertion amount Ai is selected to be greater than or equal to the taper depth L, the sheet The foreign matter was sufficiently removed from the end surface 3 of the shaped member 2.

In the verification experiment described above, when the pressure and flow rate of the compressed gas and the nozzle angle θ satisfy the above-described conditions, foreign matter removal is difficult if the inter-nozzle distance He is 3.0 mm, but the inter-nozzle distance He is 1.0 mm. If so, foreign matter removal may be possible. Therefore, it can be seen that the foreign matter can be removed if the inter-nozzle distance He is less than 3.0 mm under the above-described conditions.

The inter-nozzle distance He is preferably equal to or greater than the sum (= T + α) of the layer thickness T of the sheet-like member 2 and the width α of the space from which foreign matter can be removed, as shown in Formula 1. That is, the lower limit value of the inter-nozzle distance He is larger than the layer thickness T of the sheet-like member 2, and the width α of the space from which foreign matter can be removed remains. If the size of the target foreign matter is about 0.1 mm, the space width α is about 0.3 or more (α ≧ 0.3), but it is more desirable to take a margin.

The inter-nozzle distance He is preferably not more than a value obtained by dividing the gas flow rate Q at the tip of the nozzle member 12 by the product W · ν of the width W of the nozzle member 12 and the target flow velocity ν of the gas. That is, the upper limit value of the inter-nozzle distance He is preferably selected to be a distance at which the actual flow velocity V [m / s] of the gas at the tip of the nozzle member 12 is not less than a predetermined value ν.

The inter-nozzle distance He, the gas flow rate Q [m ³ / s] at the tip of the nozzle member 12, the gas flow velocity V [m / s] at the tip of the nozzle member 12, and the width W [m] of the nozzle member 12 And the target flow velocity ν [m / s] of the gas, there is a relationship represented by Equation 2. Therefore, the upper limit value of the inter-nozzle distance He is determined as shown in Expression 3.
Q = W / He / V (2)

However, since Formula 2 and Formula 3 are formulas for an ideal fluid, energy loss is not included. The loss varies depending on the shape of the nozzle member 12 and the like. If the influence on the flow velocity is assumed to be β, a preferable range of the inter-nozzle distance He is a range represented by Equation 4.

When the above calculation was performed based on the nozzle member used in the experiment, He ≦ 2.0. This is consistent with the experimental condition that suction is not possible at 3.0 mm. However, since the calculation result does not always match the actual machine, it is desirable to set the lower limit value to a value with some margin.

Further, from the result of the verification experiment described above, when the pressure of the compressed gas is selected to be 0.6 MPa and the flow rate of the compressed gas is selected to be 200 liters / minute, the innermost end of the nozzle hole 18 of the nozzle member 12 is selected. The inter-nozzle distance He in the sheet thickness direction Dh is selected to be less than 3.0 mm, and the insertion amount Ai of the sheet-like member 2 into the nozzle member 12 is equal to the nozzle hole 18 of the nozzle member 12 as shown in Expression 5. If the depth is selected to be greater than or equal to the depth L, it can be seen that the foreign matter on the end surface 3 of the sheet-like member 2 is sufficiently removed.
Insertion amount Ai ≧ taper depth L of the sheet-like member 2 (5)

If the insertion amount Ai of the sheet-like member 2 is large, foreign matter can be removed, but vibration may occur in the sheet-like member 2 and the sheet-like member 2 may be damaged. Therefore, the insertion amount Ai has an upper limit. The upper limit value of the insertion amount Ai of the sheet-like member 2 varies depending on the shape of the nozzle member 12, the size of the sheet-like member 2, the tact of the cleaning device, and the like. Basically, a preferable range of the insertion amount Ai of the sheet-like member 2 is selected as a range represented by the formula 6. Since it suffices to satisfy L ≦ Ai, it is desirable that the amount of room for insertion γ is small.
L ≦ Ai ≦ L + γ (6)

Further, in Tables 1 and 2, the flow velocity of the airflow generated near the outside of the suction port 15 of the nozzle member 12 under the condition that the foreign matter is sufficiently removed, that is, the suction port 15 of the airflow 20 flowing into the nozzle member 12 from the outside. When the flow velocity was measured, the flow velocity was 6.0 m / s. As the gap between the nozzle member 12 and the sheet-like member 2 is narrower, the flow velocity of the airflow 20 is increased. From Tables 1 and 2, it can also be seen that the smaller the inter-nozzle distance He, the greater the possibility that foreign matter can be removed.

From the result of the verification experiment as described above, if the flow velocity at the suction port 15 of the airflow 20 flowing into the nozzle member 12 from the outside is selected to be 6.0 m / s or more, the end surface 3 of the sheet-like member 2 and the vicinity thereof. It can be seen that the foreign matter is sufficiently removed. That is, in the sheet-like member cleaning device 1, when the suction force is induced to the suction port 15, the flow velocity of the gas flowing from the outside into the nozzle member 12 through the suction port 15 is selected to be 6.0 m / second or more. Is preferred. If the flow velocity of the airflow 20 is selected within the above-mentioned range, the foreign matter adhering to the end surface 3 of the sheet-like member 2 and the vicinity thereof is surely attracted by the low pressure region downstream of the end surface 3 generated by the airflow 20. Removed. Thereby, the sheet-like member cleaning device 1 can reliably clean the end surface 3 of the sheet-like member 2 and the vicinity thereof.

In the verification experiment, it was found that whether or not foreign matter can be removed is determined based on the relationship between the flow velocity of the airflow 20 and the suction time. When the flow rate of the airflow 20 is 6.0 m / s, foreign matter can be removed with a suction time of 0.5 seconds or more. Moreover, when the flow velocity of the airflow 20 is 7.0 m / s, foreign matter can be removed with a suction time of 0.3 seconds or more. A high flow rate is effective because foreign matter can be removed with less suction time, but it takes into account various factors such as an increase in the pressure of compressed gas, a complicated shape of the tip of the nozzle member 12, and energy loss due to a shape change. Must. In this embodiment, taking into consideration the influence of the apparatus cost and tact, etc., an example has been shown that foreign matter removal is possible if the flow rate is 6.0 m / s or more. The upper limit value of the flow velocity of the airflow 20 is not particularly limited.

6A and 6B are enlarged photographs showing the state before and after cleaning of the end face of the sheet-like member to be cleaned in the verification experiment. FIG. 6A shows a state before cleaning, and FIG. 6B shows a state after cleaning. In FIG. 6A and FIG. 6B, the width of the scale which is an internal arrow corresponds to 100 μm. When the flow velocity of the airflow 20 flowing into the nozzle member 12 from the outside through the suction port 15 is selected to be 6.0 m / s or more, the end face in a state where foreign matters are attached as shown in FIG. As can be seen from FIG.

The various parameters of the sheet-like member cleaning device 1 are preferably set so as to satisfy the above-described flow velocity condition of the airflow 20. For example, in the case of the sheet-like member cleaning device having the configuration of the verification experiment as shown in FIG. 4, the pressure and flow rate of the compressed gas, the nozzle angle θ, the inter-nozzle distance He, and the insertion amount Ai of the sheet-like member 2 are described above. If all of the above conditions are satisfied, the flow velocity of the air flow 20 accompanying suction becomes 6.0 m / s or more, so that the end surface 3 of the sheet-like member 2 is reliably cleaned.

FIG. 7 is a cross-sectional view showing a configuration of a sheet-like member cleaning device 31 which is still another embodiment of the present invention. 8A and 8B are perspective views showing an appearance of the sheet-like member cleaning device 31 of FIG. FIG. 9 is a perspective sectional view of the sheet-like member cleaning device 31 of FIG. 7 and 9 are cross-sectional views taken along section line BB in FIG. 8B. The sheet-like member cleaning device 31 of the second embodiment cleans the end surface 3 of the entire circumference of the sheet-like member 2.

When comparing the sheet-like member cleaning device 1 of the first embodiment and the sheet-like member cleaning device 31 of the second embodiment, a part of the configuration of the both 1, 31 is common to each other. 7 to 9, in the configuration of the sheet-like member cleaning device 31 of the second embodiment, the same configuration and the same name as the configuration of the sheet-like member cleaning device 1 of the first embodiment are the same. Reference numerals may be attached and explanations may be omitted. Moreover, the sheet-like member cleaning device 31 of the second embodiment can be used in the sheet-like member manufacturing process described in the first embodiment, instead of the sheet-like member cleaning device 1 of the first embodiment.

The configuration of the sheet-like member cleaning device 31 according to the second embodiment will be described below with reference to FIGS. The sheet-like member cleaning device 31 in FIG. 7 includes at least the holding unit 11, the nozzle member 32, and the suction unit 13, and preferably further includes a spraying unit 41. The nozzle member 32 in FIG. 7 includes a first nozzle component 33 and a second nozzle component 34.

The first nozzle part 33 is a bowl-shaped part and has an opening 35 at the bottom. The second nozzle part 34 is a bowl-shaped part smaller than the first nozzle part 33 and has an opening 36 at the bottom. The first nozzle part 33 and the second nozzle part 34 are combined in a nested manner, and the second nozzle part 34 is located inside the first nozzle part 33. There is a gap between the first nozzle part 33 and the second nozzle part 34.

The end of the opening 35 of the first nozzle part 33 and the end of the opening 36 of the second nozzle part 34 are combined to form the suction port 37 of the nozzle member 32. A gap between the first nozzle part 33 and the second nozzle part 34 forms an internal space 39 of the nozzle member 32. An end of the internal space 39 of the nozzle member 32 opposite to the suction port 37 functions as a discharge port 38 of the nozzle member 32. The discharge port 38 of the nozzle member 32 is connected to the suction unit 13.

The portion sandwiched between the portion around the opening 35 at the bottom of the first nozzle component 33 and the portion around the opening 36 at the bottom of the second nozzle component 34 functions as the nozzle hole 18 of the nozzle member 32.

Openings

35 and 36 at the bottoms of the first and

second nozzle components

33 and 34 so that the distance Hx between the inner surfaces 19 facing the sheet thickness direction Dh of the nozzle holes 18 of the nozzle member 32 decreases as the distance from the suction port 37 increases. The peripheral portions are chamfered so as to incline toward each other toward the downstream side in the air flow direction, and are inclined.

In the space between the bottom of the first nozzle part 33 and the bottom of the second nozzle part 34, the front and back main surfaces 4 face the

openings

35, 36 of the first and

second nozzle parts

33, 34. The sheet-like member 2 is disposed at the position. When the

openings

35 and 36 are narrower than the main surface 4 of the sheet-like member 2, the end of the entire circumference of the sheet-like member 2 is the internal space of the nozzle member 32 if the sheet-like member 2 is disposed at the aforementioned position. 39 is inserted.

The arranged sheet-like member 2 is held by the holding portion 11 so that the end of the entire circumference of the sheet-like member 2 is not bound. With the sheet-like member 2 disposed between the first nozzle component 33 and the second nozzle component 34, the suction unit 13 guides the suction force to the suction port 37 of the nozzle member 32. As a result, an airflow 20 from the outside of the nozzle member 32 to the inside of the nozzle member 32 is generated. Therefore, the air flow 20 generates a lower pressure region than the air flow 20 in the downstream region in the suction direction from the end surface 3 of the entire circumference of the sheet-like member 2, and causes a high suction force to act on the end surface 3 and the vicinity thereof. The end surface 3 and its vicinity can be cleaned.

Thus, in the sheet-like member cleaning device 31 of the other embodiment described above, the end of the entire circumference of the sheet-like member 2 is inserted into the nozzle member 32 when the suction force is guided to the nozzle member 32. Therefore, when the suction force is induced, the air flow 20 from the outside to the inside of the nozzle member 32 flows so as to be separated from the end surface 3 of the entire periphery through the surface of the end of the entire periphery of the sheet-like member 2. As a result, the sheet-like member cleaning device 31 of the second embodiment applies a high suction force to the end surface 3 of the entire circumference of the sheet-like member 2 and the vicinity thereof regardless of the shape of the end of the sheet-like member 2. The foreign matter adhering to the end surface 3 and the vicinity thereof can be reliably and efficiently cleaned.

Further, since the sheet-like member 2 is sandwiched between the bottoms of the nested first and

second nozzle parts

33, 34, even if the main surface 4 of the sheet-like member 2 is not substantially rectangular, The end can be inserted into the nozzle member 32. Therefore, the sheet-like member cleaning device 31 according to the second embodiment reliably and reliably covers the end face 3 and the vicinity of the entire circumference of the sheet-like member 2 regardless of the shape of the main surface as well as the end face shape of the sheet-like member 2. It can be cleaned efficiently.

Further, in the sheet-like member cleaning device 31 of the other embodiment described above, the blowing unit 41 emits gas (air in this embodiment) to the main surface 4 of the sheet-like member 2 when the suction force is induced to the nozzle member 32. Spray. By the gas blowing, an air flow 42 is further generated from the central portion of the main surface 4 of the sheet-like member 2 toward the peripheral end surface 3. The air flow 42 by the gas blowing finally flows into the nozzle member 32 from the outside of the nozzle member 32 through the suction port 37 in the same manner as the air flow 20 by suction force induction. In the example of FIG. 7,

flow paths

43 and 44 are further attached to the

openings

35 and 36 of the first and

second nozzle parts

33 and 34. The airflow 42 from the spraying part 41 is guided to the

flow paths

43 and 44 and sprayed to the main surface 4 of the sheet-like member 2.

Thus, by blowing gas on the main surface 4 of the sheet-like member 2 that is being held, the sheet-like member cleaning device 31 according to the second embodiment has the entire sheet-like member 2 in the cleaning process of the sheet-like member 2. Can be fixed. As a result, the sheet-like member cleaning device 31 can prevent the position of the sheet-like member 2 from being shifted in the device 31, so that the end surface 3 of the sheet-like member 2 can be more reliably cleaned. At the same time, the sheet-like member cleaning device 31 according to the second embodiment can blow off and remove foreign matter adhering to the front and back main surfaces 4 of the sheet-like member 2 by blowing gas onto the main surface 4. Therefore, since the sheet-like member cleaning device 31 can clean the main surface 4 of the sheet-like member 2 while reliably cleaning the end surface 3 of the sheet-like member 2, the efficiency of the cleaning process of the sheet-like member 2 is improved. Can be improved.

The configuration of the sheet-like member cleaning device 31 of the other embodiment described above will be described in more detail with reference to FIGS. The sheet-like member 2 is realized by a laminated body in which a plurality of sheet pieces 5 to 8 are sequentially laminated.

The first nozzle part 33 and the second nozzle part 34 are for cleaning the end of the sheet-like member 2 in the sheet-like member cleaning device 31 of the other embodiment described above. A suction port 37 is formed near the end of the sheet-like member 2 sandwiched between the first nozzle part 33 and the second nozzle part 34. The shape of the nozzle hole 18 of the nozzle member 32 in the vicinity of the suction port 15 is such that the distance between the inner surface 19 facing the sheet thickness direction Dh is reduced from the suction port 37 toward the exhaust port 38. As a result, when the end of the sheet-like member 2 is sucked, outside air is sucked through a slight gap between the first nozzle component 33 and the second nozzle component 34 and the sheet-like member 2, and the air flow 20 causes foreign matter to be sucked. There is an effect that is removed.

The discharge port 38 of the nozzle member 32 formed from the first nozzle part 33 and the second nozzle part 34 is connected to the suction part 13. As the suction part 13, various conventionally known suction parts such as an ejector and a vacuum pump can be used.

The holding unit 11 is an element for preventing the sheet-like member 2 from moving when the sheet-like member 2 is cleaned by the first nozzle component 33 and the second nozzle component 34. The holding part 11 preferably holds the central part of the sheet-like member 2 as shown. Further, the holding location is not particularly limited, and any location may be held as long as the sheet-like member 2 does not move. Moreover, the location to hold | maintain may not be only one location as shown in the figure, but may hold multiple locations.

It is desirable to use a material that does not damage the sheet-like member 2 at a location where the sheet-like member 2 is in contact with the holding portion 11. Examples of such a material include a material such as nitrile rubber.

The sheet-like member cleaning device 31 of the second embodiment can be equipped with a plurality of first nozzle parts 33, second nozzle parts 34, and holding parts 11. Thereby, many sheet-like members 2 can be cleaned at a time. Of course, the sheet-like member cleaning device 31 can also be used for cleaning a single-layer sheet-like member.

Next, how the sheet-like member cleaning device 31 operates will be described. The sheet-like member cleaning device 31 in FIG. 7 includes a transport unit 22, a holding drive unit 23, and a nozzle drive unit 46 in addition to the holding unit 11, the nozzle member 32, the suction unit 13, and the spraying unit 41.

In the initial state, the distance between the tips of the pair of rod-like members of the holding portion 11 is larger than the thickness of the sheet-like member 2. Further, as shown in FIG. 8A, the first nozzle part 33 and the second nozzle part 34 are sufficiently separated from each other by the thickness of the sheet-like member 2. First, the sheet-like member 2 is conveyed between the holding units 11 by the conveyance unit 22. Various conventionally known ones can be applied to the transport unit 22, for example, a robot hand.

When the sheet-like member 2 is conveyed between the holding parts 11, the holding part 11 is operated by the holding drive part 23, and the central part of the sheet-like member 2 is held and fixed so as not to move. This prevents the sheet-like member 2 from being sucked or displaced during cleaning.

Nearly simultaneously with the holding of the sheet-like member 2 by the holding part 11, the first nozzle part 33 and the second nozzle part 34 are brought closer by the nozzle driving part 46. Thereby, as shown in FIG. 8B, the sheet-like member 2 is accommodated between the first nozzle part 33 and the second nozzle part 34.

Thereafter, the suction unit 13 sucks the interior of the internal space 39 between the first nozzle part 33 and the second nozzle part 34. At the same time, the spraying part 41 sprays air blow on the front and back main surfaces 4 of the sheet-like member 2. As a result, an air flow 20 is generated from the front and back main surfaces 4 of the sheet-like member 2 to the inside of the nozzle member 32 through the suction port 37. The generated airflow 20 removes foreign matter adhering to the front and back main surfaces 4 and end surfaces 3 of the sheet-like member 2. Further, the internal foreign matter in the vicinity of the end face of the laminated sheet-like member 2 is also removed. As a result, the end surface 3 and the front and back main surfaces 4 of the entire circumference of the sheet-like member 2 are cleaned.

FIG. 10 is a cross-sectional view showing a configuration of a suction nozzle 12 according to still another embodiment of the present invention. 11A and 11B are explanatory views showing the shape of the rectifying plate 50 of the suction nozzle 12 of FIG. FIG. 11A shows the flow straightening plate 51 viewed from the suction port 15 side, and FIG.

The suction nozzle 12 is formed with a suction port 15, and a discharge port 16 is provided on the opposite side of the suction nozzle 12. The suction nozzle 12 is connected to the suction unit 13, and the suction force from the suction unit 13 is guided. The internal space 17 of the suction nozzle 12 is divided by the current plate 50 into a space 17a on the suction port 15 side and a space 17b on the discharge port 16 side. The rectifying plate 50 is provided with an opening 51 including a plurality of openings 52 to 58. The air sucked from the suction port 15 passes through the internal space 17a, the opening 51 of the rectifying plate 50, and the internal space 17b, and is exhausted from the discharge port 16.

In the suction nozzle 12 of the present embodiment, the discharge port 16 is provided at the center of the nozzle width, and the rectifying plate 50 includes a central axis of the discharge port 16 and is perpendicular to the width direction (perpendicular to the paper surface of FIG. 11B). The case of a symmetrical shape is shown. The straightening plate 50 is provided with straight cylindrical openings 52 to 58 at an equal pitch. The distances from the center 16a of the discharge port 16 to the centers 52a to 58a of the openings 52 to 58 are L ₁ to L ₇ , respectively, and the areas of the openings 52 to 58 are S ₁ to S ₇ . At this time, the ratio of the opening areas S ₁ : S ₂ : S ₃ : S ₄ : S ₅ : S ₆ : S ₇ and the distance from the center of each opening to the center of the discharge port 16 at this time. The ratio L ₁ : L ₂ : L ₃ : L ₄ : L ₅ : L ₆ : L ₇ is
_{_{_{S 1: S 2: S 3}}} : S 4: S 5: S 6: S 7 = L 1: L 2: L 3: L 4: L 5: L 6: L 7
Satisfy the relationship.

The total area S ₁ + S ₂ + S ₃ + S ₄ + S ₅ + S ₆ + S ₇ of each opening 52 to 58 of the current plate 50 and the cross-sectional area S of the discharge port 16 are:
S ₁ + S ₂ + S ₃ + S ₄ + S ₅ + S ₆ + S ₇ ≦ S
Satisfy the relationship. For example, if L ₄ is 20 mm and the distance between adjacent openings is 20 mm,
S ₁ : S ₂ : S ₃ : S ₄ : S ₅ : S ₆ : S ₇
= 3.16: 2.24: 1.41: 1: 1.41: 2.24: 3.16
It becomes.

Further, assuming that the inner diameter of the discharge port 16 is 20 mm, the inner diameters of the openings 52 to 58 are, for example, 7.11 mm for the opening 52 and the opening 58, 5.97 mm for the opening 53 and the opening 57, and Is selected to be 4.77 mm and the opening 55 is selected to be 4 mm.

FIG. 12 shows the effect of the current plate 50. The distribution of the flow velocity in the vicinity of the suction port 15 of the suction nozzle 12 in the suction port width direction is shown with and without the rectifying plate 50. In the figure, the vertical axis represents the flow velocity, and the horizontal axis represents the nozzle opening position. The rectifying plate 50 is provided with openings 52 to 58 that meet the above conditions. When there is no current plate 50, the suction flow velocity is fast near the center and slow at both ends. This is because the flow concentrates on the discharge port 16. On the other hand, by inserting the current plate 50, the flow to the discharge port 16 can be equalized in the width direction of the suction port 15, and the suction flow velocity can be made substantially uniform over the entire width.

Next, still another embodiment of the present invention will be described. In the rectifying plate 50 shown in the above-described embodiment, each of the openings 52 to 58 is configured by one round hole, but at a position where each of the openings 52 to 58 is formed according to the distance from the discharge port 16. Correspondingly, it may be constituted by one or more holes with different aperture ratios, such an embodiment is shown in FIG.

The current plate 60 formed in this embodiment is provided with an opening 61 composed of one or a plurality of holes. Each of the openings 62 to 68 has the same hole diameter, the number of holes is changed depending on the location, and the opening ratio is different.

The ratio _S of the opening areas of the openings 62-68 of the current plate _{_{60 1: S 2: S 3}} : S 4: S 5: S 6: the ratio of the distance between S _7, to the discharge port 16 center from each aperture center L _{_{_{1: L 2: L 3:}}} L 4: L 5: L 6: L 7 is
L ₁ : L ₂ : L ₃ : L ₄ : L ₅ : L ₆ : L ₇ = 6: 3: 2: 1: 2: 3: 6
It becomes. An opening is provided at a position where this ratio is realized. In this example, the case of the same hole diameter is shown, but a different diameter may be used depending on the position where the opening is provided.

14A and 14B are explanatory views of the opening 71 provided in the rectifying plate 70 according to still another embodiment of the present invention. FIG. 14A shows the flow straightening plate 70 viewed from the suction port 15 side, and FIG. 14B shows a cross section of the suction nozzle 12 parallel to the sheet to be cleaned and at the sheet center plane. The discharge port 16 is provided near one side in the nozzle width direction, and the flow straightening plate 70 is asymmetrical. The rectifying plate 70 is provided with right cylindrical openings 72 to 77 at an equal pitch. Distance from the center 16a of the outlet 16 to the center 72a ~ 77a of each opening 72-77 are L ₆ from _{L 1} respectively, the area of each opening 72-77 is _S 1 ~ _S _6.

Even in this case, the ratio S ₁ : S ₂ : S ₃ : S ₄ : S ₅ : S ₆ of the opening areas of the openings 72 to 77 of the rectifying plate 70 and the distance from the center of each opening to the center of the discharge port 16 The ratio L ₁ : L ₂ : L ₃ : L ₄ : L ₅ : L ₆ is
_{_{_{S 1: S 2: S 3}}} : S 4: S 5: S 6 = L 1: L 2: L 3: L 4: L 5: L 6
Satisfy the relationship.

The total area S ₁ + S ₂ + S ₃ + S ₄ + S ₅ + S ₆ of the openings 72 to 77 of the rectifying plate 70 and the cross-sectional area S of the discharge port 16 are:
S ₁ + S ₂ + S ₃ + S ₄ + S ₅ + S ₆ ≦ S
Satisfy the relationship.

For example, if the _{L 5} 20mm, and 20mm the distance between adjacent openings, the area ratio of each opening,
S ₁ : S ₂ : S ₃ : S ₄ : S ₅ : S ₆
= 4.12: 3.16: 2.24: 1.41: 1: 1.41
Further, assuming that the diameter of the discharge port 16 is 20 mm, the diameter of each opening is, for example, 10.1 mm for the opening 72, 8.89 mm for the opening 73, 7.48 mm for the opening 74, and 5.94 mm for the

opening

75 and 77. The opening 76 can be selected to be 5 mm.

As described above, the sheet-like

member cleaning devices

1 and 31 described in the above embodiments can be used, for example, for cleaning an optical sheet used in a backlight of a liquid crystal display device. The sheet-like member 2 cleaned by the above-described sheet-like

member cleaning devices

1 and 31 can be used by being incorporated in a backlight. The backlight is realized not only by an edge light type backlight having the configuration as shown in FIG. 10, but also by various backlights used in the past. Moreover, the sheet-like

member cleaning apparatuses

1 and 31 of the above-described embodiments are effective techniques for cleaning all thin plate-like sheet-like members 2 as well as optical sheets, and are versatile.

In the sheet-like

member cleaning apparatuses

1 and 31 and the sheet-like member manufacturing method described in the above-described embodiment, details of various components are one of the best embodiments of the components of the present invention. The detailed configuration of the constituent elements of the present invention is not limited to the above-described configuration as long as the above-described effects can be exhibited, and various other configurations may be used.

The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-described embodiment is merely an example in all respects, and the scope of the present invention is shown in the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the scope of the claims are within the scope of the present invention.

DESCRIPTION OF

SYMBOLS

1,31 Sheet-like member cleaning apparatus 2 Sheet-

like member

5,8

Diffusion sheet

6,7 Prism sheet 9 Convex part of end face of sheet-like member 11

Holding part

12, 32 Nozzle member 13

Suction part

15, 37 Suction port of nozzle member DESCRIPTION OF SYMBOLS 18 Nozzle hole of nozzle member 19 Inner surface of nozzle member 20 Air flow 33 1st nozzle part 34

2nd nozzle part

35,36 Bottom opening part of 1st and 2nd nozzle part 41 Spraying

part

50,60,70

Current plate

51,61 , 71 opening

Claims

In the sheet-like member cleaning device for cleaning the sheet-like member,
A holding part for holding the sheet-like member;
A nozzle member having a suction port at the tip,
A suction part for guiding suction force to the suction port of the nozzle member,
In the vicinity of the end of the sheet-like member held by the holding part, the suction port of the nozzle member is disposed,
The said nozzle member has a nozzle hole which becomes small, so that the space | interval between the inner surfaces which oppose the thickness direction of the said sheet-like member leaves | separates from the said suction port, The sheet-like member cleaning apparatus characterized by the above-mentioned.
The sheet-like member cleaning device according to claim 1, wherein the nozzle member is formed such that a cross-sectional shape of an inner surface of the nozzle hole facing the thickness direction of the sheet-like member is tapered.
The sheet-like member cleaning device according to claim 1, wherein the nozzle member is formed such that an inner surface of the nozzle hole facing the thickness direction of the sheet-like member has an arc shape.
The nozzle member is formed in a tubular shape,
The suction port of the nozzle member opens in a substantially rectangular shape larger than the end surface of the sheet-like member,
The sheet-like member cleaning device according to any one of claims 1 to 3, wherein an end of one side of the sheet-like member is inserted into the nozzle member.
The nozzle member is
A bowl-shaped first nozzle component having an opening on the bottom surface;
A first nozzle part and a second nozzle part that is arranged in a nested manner and has an opening on the bottom surface;
A suction port of the nozzle member is formed by the opening of the first nozzle part and the opening of the second nozzle part,
The sheet-like member is disposed between the first nozzle part and the second nozzle part,
The sheet-like member cleaning device according to any one of claims 1 to 3, wherein an end portion of the entire circumference of the sheet-like member is inserted into the nozzle member.
The sheet-like member cleaning device according to any one of claims 1 to 5, further comprising a blowing portion that blows gas to a main surface of the sheet-like member when the suction portion is sucked.
The suction unit guides a suction force to the suction port of the nozzle member before the end of the sheet-like member is inserted into the nozzle member. The sheet-like member cleaning apparatus described in 1.
The sheet-like sheet according to any one of claims 1 to 7, wherein a flow rate of the gas flowing into the suction port of the nozzle member at the time of suction of the suction part is selected to be 6.0 m / second or more. Member cleaning device.
The suction part guides a suction force to the suction port of the nozzle member by sending and discharging compressed gas to a space communicating with the nozzle hole in the suction part,
The pressure of the compressed gas sent into the suction part is selected as 0.6 MPa, and the flow rate of the compressed gas is selected as 200 liters / minute,
The distance between the innermost ends of the nozzle holes on the inner surface of the nozzle member facing the sheet member in the thickness direction is selected to be less than 3.0 mm,
The sheet-like member cleaning apparatus according to claim 8, wherein an insertion amount of the sheet-like member into the nozzle member is equal to or greater than a depth of a nozzle hole of the nozzle member.
The sheet-like member cleaning according to any one of claims 1 to 9, wherein the sheet-like member is formed in a substantially rectangular shape, and a convex portion is formed at an end of the sheet-like member. apparatus.
The sheet-like member cleaning device according to any one of claims 1 to 10, wherein the sheet-like member is constituted by a laminated body in which a plurality of sheet pieces are laminated.
The sheet-like member cleaning device according to any one of claims 1 to 11, wherein the sheet-like member includes a diffusion sheet.
The sheet-like member cleaning device according to any one of claims 1 to 12, wherein the sheet-like member includes a prism sheet.
The nozzle member has a discharge port through which a suction force from the suction unit is guided, and a current plate having a plurality of openings in the longitudinal direction is disposed between the discharge port and the suction port. The sheet-like member cleaning apparatus according to claim 1.
The sheet-like member cleaning device according to claim 14, wherein an area ratio of the plurality of openings provided in the current plate is equal to a ratio of a distance from the center of the discharge port to the center of each opening.
The sheet-like member cleaning device according to claim 14 or 15, wherein the total area of the openings of the rectifying plates is equal to or smaller than a discharge port cross-sectional area.
The sheet-like member cleaning device according to any one of claims 14 to 16, wherein the opening of the current plate is larger than the object to be sucked.
The sheet-like member cleaning device according to any one of claims 1 to 17, wherein the opening of the nozzle member has an aspect ratio of 10 or more.
Cutting the raw fabric into a predetermined shape to form a sheet-like member;
A cleaning step of cleaning an end face of the sheet-like member cut in the cutting step using a nozzle member having a suction port,
The cleaning step is characterized in that an air flow is generated by a gas flowing from a gap between an end portion of the sheet-like member and the suction port to remove cutting waste adhering to the end surface of the sheet-like member. Sheet-like member manufacturing method.
The sheet-like member manufacturing method according to claim 19, wherein the sheet-like member is formed in a substantially rectangular shape, and a convex portion is formed at an end of the sheet-like member.
21. The sheet-like member manufacturing method according to claim 19 or 20, wherein the sheet-like member is constituted by a laminated body in which a plurality of sheet pieces are laminated.
The sheet-like member manufacturing method according to any one of claims 19 to 21, wherein the sheet-like member includes a diffusion sheet.
The sheet-shaped member manufacturing method according to any one of claims 19 to 22, wherein the sheet-shaped member includes a prism sheet.