JPH01307469A - Discharger for coating pattern equipping a plurality of liquid discharge nozzles - Google Patents

Abstract

PURPOSE:To simultaneously form the pattern of a plurality of coating liquids by providing a plurality of liquid discharge nozzles and making the diameters of the liquid discharge nozzles which are positioned apart from the discharge port of a liquid reservoir larger than the diameters of the liquid discharge nozzles which are positioned near to the discharge port of the liquid reservoir. CONSTITUTION:Coating liquid is sent at the controlled quantity from a liquid reservoir 1 by a feeder 2. Further a plurality of liquid discharge nozzles 3 communicated with the liquid reservoir 1 are provided. Furthermore the diameters of the nozzles 3 which are positioned apart from the discharge port of the liquid reservoir 1 are larger than the diameters of the nozzles 3 which are positioned near to the discharge port of the liquid reservoir 1. In other words, when the diameters of the nozzles are decided so that the amounts discharged from respective nozzles 3 are made equal by a formula of pressure drop in laminar flow, equipment of coating liquid is simultaneously discharged through a plurality of liquid discharge nozzles and therefore the pattern of a plurality of coating liquids can be simultaneously formed and thereby productivity is enhanced in comparison with a discharger which is used for coating the pattern and has one liquid discharge nozzle and also a uniform product can be obtained.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is a method of discharging a coating solution to apply a pattern onto a support in order to fabricate a biochemical analysis element, etc. that performs analysis by a color reaction with blood, etc. Regarding equipment.

[Prior Art] An adhesive layer, a reagent layer, and a WAgli layer are formed on a support as an analytical element for chemically analyzing the presence or absence of a specific component in a liquid sample such as blood or serum, or its content. A biochemical analysis element formed by laminating layers is known. Conventionally,
Such a biochemical analysis element was provided by coating a spreading layer etc. on the entire surface of a light-transmitting sheet support using a blade coater, drying it, and then cutting the coated film into a square with a side of approximately 14 bells.

Biochemical analysis is performed by dropping blood, etc. onto such a biochemical analysis element and using a color reaction, but the blood, etc. spreads out in a circular shape from the center and participates in only one part of the biochemical analysis element. Laminating an expensive spreadable layer material or the like over the entire surface of the support is wasteful in terms of manufacturing costs. Furthermore, coating with a blade coater orients the fibers included in the spreading layer, making it impossible to spread blood or the like uniformly. Japanese Patent Application No. 63-8073 filed by the present applicant in order to improve the above problems,
Exhibited in special application No. 1983-8075! A technique has been proposed in which the a-layer and the like are coated in a pattern using a discharging device.

[Problems to be Solved by the Invention] In order to accurately control the supply liquid m, the above-mentioned discharge device for pattern coating has a liquid reservoir provided directly above the l ffl Lll Ill pump and supplies the liquid from this liquid reservoir. However, the dispensing device has one liquid discharging nozzle, and after discharging the coating liquid from the liquid discharging nozzle to form one coating liquid pattern on the support, the coating liquid pattern placed on the support is The next coating liquid pattern is drawn by moving the liquid discharge nozzle by the pitch interval. That is, the liquid discharge nozzle must be moved by the number of patterns to be formed on the support, and the coating liquid must be discharged so as to form the coating liquid pattern.

Therefore, it takes a long time to apply the pattern! There was one question. The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a discharge device for pattern coating with high productivity.

[Means for Solving the Problems] In a pattern coating discharge device for supplying a coating liquid, the dispensing device for discharging a coating liquid in a controlled manner from a liquid reservoir and a liquid discharging nozzle that communicates with the liquid reservoir is provided. A plurality of discharge nozzles are provided, and the diameter of the liquid discharge nozzle located far from the discharge port of the liquid reservoir is made larger than the diameter of the liquid discharge nozzle located near the discharge port of the liquid reservoir.

[Operation] Since as many coating liquid patterns as the number of liquid discharge nozzles are formed at the same time, the pattern forming time per pattern is shortened.

In addition, the amount of liquid discharged from the liquid discharge nozzle located far from the pump's discharge port tends to decrease due to the large flow path resistance, but it is necessary to increase the liquid discharge nozzle diameter to compensate for the decrease in flow rate due to the flow path resistance. Accordingly, the discharge amount from all liquid discharge nozzles can be made the same.

[Example] A first embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a mono pump 2, which is a flow rate control pump, is connected below a liquid WA1 for storing a coating liquid, and a plurality of liquid discharge nozzles 3 are provided in communication with a discharge port of the mono pump 2. As shown in FIG. 2, the Mono pump 2 includes a helical rotating body 2b with a circular cross section inside an elastic stator 2a which has a gap in which the direction of the long axis of the oval cross section changes in the height direction. The rotating body 2b is rotated by a pulse motor 5 placed above the liquid reservoir 1. Such a Mono pump discharges the liquid in the suspended liquid reservoir 1 from the liquid discharge nozzle 3 in proportion to the number of rotations of the rotating body 2b, and also reverses the flow direction of the liquid by rotating the rotating body 2b in the opposite direction. By instantly sucking the liquid, dripping is prevented. A coating liquid is supplied to the liquid reservoir 1 by a coating liquid supply pump 6. Also Mono pump 2
A plurality of liquid discharge nozzles 3.3... that communicate with the discharge ports are arranged in a row with a pitch interval of 2/3p, and the discharge of the mono pump is arranged so that the flow rate of the coating liquid discharged from each discharge nozzle is equal. The nozzle diameter increases as the distance from the outlet increases. These nozzle diameters were determined as follows.

Assuming that the discharge amount from each nozzle is equal, the pressure difference in the laminar flow between the discharge port of Monopump 2 and each nozzle outlet is equal, and the flow rate after branching is equal to the flow rate before branching, so the following formula is obtained. holds true.

Di Lll = D22U2 (2>
Do UO=DI Ul +D22U2 (3)
However, L is the nozzle length, 1 is the dimension shown in Figure 2, DOl
Dl, D2, each diameter of the illustrated portion of the flow path, UOlUl
, U2 are each the average flow velocity of the illustrated portion of the flow path.

(IO2) From formula (3) is obtained.

fJ=21s+, L=5mIri, Do=4m1D1
=2rtm, then 02=2.1m.

Note that the dimensions of each part are symmetrical.

By determining the nozzle diameter in this way, the discharge amount from each nozzle became equal.

The pattern coating discharge device 11 configured as described above is supported by the robot 7 and can be moved along any desired path. The movements of the robot 7, pulse motor 5, and coating liquid supply pump 6 described above are controlled by a control panel 8.

Next, discharge for the above pattern application! A case will be described in which a biochemical analysis element is manufactured using the T apparatus.

A polyethylene terephthalate sheet with a thickness of 180 μm is used as a support. An adhesive layer and a reagent layer are applied to the entire area of the support using a coating machine such as a blade coater, and after these layers are dried, the support 9 is coated as shown in FIG.
is placed on an 8-shift platform 10 that can be moved vertically. The robot 7 supporting the pattern coating discharge device 11 moves the liquid discharge nozzles 3, 3, . . . to a position P on the support where a pattern is to be formed.

After adjusting P... (the distance between P and P is 2/34!s) and determining the gap G between the support 9 and the liquid discharge nozzle 3, the control panel 8 rotates the rotating body 2b. The liquid discharge nozzle 3 discharges I Tfi y& in an amount necessary to form a spread layer. In this case, the nozzle may be fixed at the point and the coating liquid may be applied in a dotted manner, or the coating liquid may be applied in a circular manner by robot operation. In this way, pattern coating for the first row is completed. After that, move the moving table 10 in the direction of the arrow by 2/3j mt.
The pattern coating discharge device is operated in the same manner as described above to apply the pattern to the second column, and the coating of all columns such as the third and fourth columns is completed, as shown in Fig. 4. Deployment layers 12, 12, . . . are formed. However, the above;
After waiting for the 7f1 layer to dry, the support is slit so that the spread layer is in the center as shown by the broken line in FIG. 4, thereby obtaining the desired biochemical analysis element. Fifth
Nine liquid discharging nozzles of the second embodiment of the present invention shown in the figures and FIG. 6 are arranged in a lattice pattern, and pattern coating is performed at nine locations in one discharge. The diameter of the nine liquid discharge nozzles increases as the distance from the center increases. In this case, a spread layer is formed on the support while the liquid discharge nozzle and the movable stage 9 are fed in the 3S#II bit.

Note that the parts other than the liquid discharge nozzle part in the second embodiment are the same as those in the first embodiment.
This is similar to the embodiment.

In the third embodiment of the present invention shown in FIG. 7, the coating liquid in the liquid reservoir 1 is pumped through the liquid discharge nozzles 3, 3, . . . by the air pressure in the upper space.
extruded from. The air pressure in the upper space is controlled by the controller 17.
The pressure and time are controlled to control the amount of coating liquid to be discharged. That is, the upper space of the liquid reservoir 1 and the controller 17 are connected by a flexible tube 18,
The flow path of the flexible tube 18 is connected to a tank storing high-pressure air or a vacuum tank by a solenoid valve (not shown) within the controller 17. Air supplied from a compressor through a pipe 14 is adjusted to a predetermined pressure by a pressure regulator 16 and stored in a high-pressure tank, and air in the vacuum tank is exhausted through a pipe 15 by a vacuum pump 13. The control of the above solenoid valve is υ1tLJ
This is done by a signal from I8. In this way, liquid reservoir 1
By applying a predetermined air pressure +10 to the upper space of the liquid reservoir 1 for an arbitrary time, the required amount of coating liquid is discharged from the liquid discharge nozzle 3. By connecting to a vacuum tank, dripping from the liquid discharge nozzles 3, 3, . . . is prevented. The structure of the liquid discharge nozzles 3, 3, . . . and the operation of the robot 7 are the same as in the first embodiment.

[Effects of the Invention] As explained above, the discharge device for pattern coating of the present invention has a plurality of liquid discharge nozzles, and according to the equation of pressure loss in laminar flow, the discharge amount from each nozzle is made to be equal. If the nozzle diameter is determined, the same amount of coating liquid can be discharged from multiple liquid discharge nozzles at the same time, so multiple coating liquid patterns can be formed at the same time. Productivity is higher than that, and uniform products can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a discharge device for pattern coating, not showing the first embodiment of the present invention; FIG. 2 is an enlarged cross-sectional view of a mono pump portion and a liquid discharge nozzle portion of the discharge device; FIG. 3 4 is an explanatory diagram showing the slitting location after pattern application. FIG. 5 is a side view of the liquid discharge nozzle section of the second embodiment of the present invention. FIG. 6 is the bottom view of the same. FIG. 7 is a schematic side view showing a third embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Liquid reservoir, 2...Mono pump, 3...Liquid discharge nozzle, 5...Pulse motor, 6...Coating liquid supply pump, 7...Robot, 8...Control 2II Board, 9
. . . Support IS body, 10 . . . Moving table, 11 . . . Discharge device for pattern coating, 12 . 13...Vacuum pump, 14.15...Pipe. 16... Pressure adjustment device, 17... Controller. 18...Flexible navigation. Applicant's agent Hiroshi Fujimoto Brother 2 Figure 3 Figure 4 Figure 5 6th

Claims (1)

[Scope of Claims] 1. In a pattern coating discharging device for supplying a coating liquid, the discharging device for discharging a controlled amount of a coating liquid from a liquid reservoir and a liquid discharging nozzle communicating with the liquid reservoir are arranged, A pattern characterized in that a plurality of nozzles are provided, and the diameter of the liquid discharge nozzle located far from the discharge port of the liquid reservoir is larger than the diameter of the liquid discharge nozzle located close to the discharge port of the liquid reservoir. Dispensing device for coating. 2. The pattern coating discharge device according to claim 1, wherein the discharge device includes a flow rate control pump disposed directly below the liquid reservoir. 3. The discharge device for pattern coating according to claim 1, wherein the discharge device includes a controller connected to the upper space of the liquid reservoir by a tube and controlling the pressure and time applied to the upper space of the liquid reservoir.