JP2002018348A - Method of stabilizing temperature of wide head or nozzle block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive method of stabilizing the temperature of a wide head or a nozzle block by using the same fluid as a liquid or a molten body discharged from a discharge port in a simple structure and also giving an uniform temperature distribution through the whole wide head or nozzle block by decreasing the generation of temperature gradation. SOLUTION: In the method of stabilizing the temperature of the wide head or the nozzle block for widely spreading the heated fluid or the molten body through a discharge port on the downstream side of the discharge port, at least one fluid passage is provided in the wide head or the nozzle block in the longitudinal direction and the same fluid or molten body as the fluid or molten body discharged from the discharge port is passed through the fluid passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stabilizing the temperature of a wide head or a nozzle block for discharging a liquid or a molten material from a discharge port and spreading the liquid or melt downstream of the discharge port.

[0002]

2. Description of the Related Art In discharging a liquid or a melt from a discharge port, it is very important to discharge the liquid or the melt while controlling the temperature of the liquid or the melt at a constant temperature. For example, when a coating operation is performed using a heated melt, if the temperature of the melt changes, the viscosity of the melt naturally changes, and the discharge amount from the nozzle device changes due to the change in viscosity. As a result, a stable coating film thickness cannot be obtained. This temperature change is
Not only does the viscosity of the melt change, but it also involves a change in the density of the melt. A change in the density of the melt causes a change in the discharge amount per unit time. Therefore, properly controlling the temperature of the liquid or melt is of paramount importance.

As a conventional method for discharging a liquid or a melt from a discharge port and developing the liquid or the melt in a wide area downstream of the discharge port, the temperature of a wide head or a nozzle block is adjusted.
In many cases, an electrothermal casting heater or cartridge heater was incorporated into a wide head or nozzle block. Further, there is a case in which a fluid passage is provided in a wide head or a nozzle block, and a heat medium fluid such as heating oil is circulated only from one direction of the fluid passage.

[0004]

In the apparatus using the above-described cast heater or cartridge heater, the shape and size of the wide head or the nozzle block are restricted.
It had to be kept within a limited shape and dimensions, resulting in a very dense and complicated heating element structure, which was troublesome in terms of processing and assembly. Further, in the wide head or the nozzle block, the temperature at both ends tends to be lower than the temperature at the center, and in order to prevent such partial temperature variation and to control the entire temperature with high accuracy, a large number of heads are used. The temperature sensor is installed together to perform partial temperature control,
Alternatively, a heating element having a partially changed heat capacity had to be incorporated. As a result, the price of the wide head or the nozzle block is increased, and a great number of man-hours are required for maintenance.

In the case of circulating a heating medium fluid such as heating oil in a fluid passage provided in a wide head or a nozzle block, since the flow is only from one direction, a space between an inlet and an outlet of the heating oil is generated. Has a large temperature gradient, it is difficult to obtain a uniform temperature distribution over the entire wide head or the nozzle block, and there is a case where the temperature is uneven. In addition, it is necessary to provide an independent circulation unit device for heating oil or the like, which also causes an increase in cost.

The present invention has been made in view of the above-mentioned problems, and is a method for stabilizing the temperature of a wide head or a nozzle block. A method for stabilizing the temperature of a wide head or a nozzle block using a fluid and having a very simple structure and at a low cost, and further, in a method using a heat medium fluid for temperature control, a temperature gradient is reduced, It is an object of the present invention to provide a method for stabilizing the temperature of a wide head or a nozzle block in which the temperature distribution is not biased over the entire wide head or a nozzle block.

[0007]

In order to solve the above-mentioned problems, the present invention employs the following method. That is, a method for stabilizing the temperature of a wide head or a nozzle block in which a heated liquid or a molten material is spread widely downstream of a discharge port through a discharge port, and in a longitudinal direction of a wide head or a nozzle book. A method for stabilizing the temperature of a wide head or a nozzle book, wherein at least one liquid or melt passage is provided and the same liquid or melt as the liquid or melt discharged from the discharge port is passed through the passage.

Further, in order to avoid a bias in the temperature distribution, a method for stabilizing the temperature of a wide head or a nozzle block, wherein the flow rate of a liquid or a melt passing through the fluid passage is 10 meters or more per minute. did. In addition, to avoid bias in the temperature distribution due to the temperature gradient of the liquid or melt,
A liquid or melt passage provided in the longitudinal direction of the wide head or the nozzle block is configured to be at least one pair, and the flow directions of the liquid or the melt passing through the passage are opposite to each other. And a method for stabilizing the temperature of the wide head or the nozzle block.

Further, there is provided a method for stabilizing the temperature of a wide head or a nozzle block in which a liquid or a molten material is spread widely downstream of the discharge port via a discharge port, the method comprising: A method for stabilizing the temperature of a wide head or a nozzle block, characterized in that at least one pair of fluid passages is provided, and fluids for temperature control are passed through the passages so as to flow in opposite directions. Further, a method for stabilizing the temperature of a wide head or a nozzle block is provided, wherein a flow rate of a temperature controlling fluid passing through the fluid passage is 10 meters or more per minute.

[0010]

Next, an embodiment of the present invention will be described. In the present invention, first, the liquid or the melt is pressure-fed from the delivery unit or the like to the wide head or the nozzle block through a pipe such as a hose in a state where the temperature is sufficiently controlled in the delivery unit or the like, that is, in a heated state, Discharge is performed wide from the discharge port of the wide head or nozzle block to the downstream. Since the wide head or the nozzle block generally has its outer surface exposed to the atmosphere, the heated liquid or melt fed into the wide head or the nozzle block causes a decrease in temperature due to heat radiation from the outer surface. Therefore, a temperature control function is added to prevent a temperature drop.

According to the first aspect of the present invention, at least one fluid passage is provided in the longitudinal direction of the wide head or the nozzle block as the temperature control function, and a liquid or a melt from the delivery unit to the wide head or the nozzle block is provided. And the liquid or the melt heated to the same state as the liquid or the melt discharged from the discharge port is made to pass through the fluid passage.

Thus, in the wide head or the nozzle block, the liquid or the melt having the same temperature as the liquid or the melt discharged from the discharge port is always circulated, and the outer surface of the wide head or the nozzle block is exposed to the atmosphere. Temperature can be prevented from being lowered. Moreover, according to this method, the structure is simpler than the conventional casting heater or cartridge heater method, and a special circulation unit for heating is provided as compared with the method using a heating medium fluid such as heating oil. There is no need, and the entire apparatus can be designed compact.

According to the present invention, the temperature gradient from the inlet to the outlet of the liquid or the melt is reduced by circulating the liquid or the melt passing through the fluid passage at a high speed of 10 meters per minute or more. Therefore, the temperature can be controlled to be uniform over the entire wide head or nozzle block.

According to a third aspect of the present invention, at least one pair of liquid or melt passages provided in the longitudinal direction of the wide head or the nozzle block is provided, and the flow direction of the liquid or melt flowing through the passages is defined. Are made to flow in opposite directions to each other, so that the temperature gradient of the liquid or the melt passing through the passage is leveled, and the bias of the temperature distribution can be eliminated over the wide head or the nozzle block.

Further, while the above-mentioned claims 1 to 3 use the same liquid or melt as the liquid or melt discharged from the discharge port as the temperature control fluid, what is shown in claims 4 and 5 is: In this configuration, another heat medium fluid is used as the temperature control fluid. This is because, as described in the related art, the conventional temperature control fluid is supplied from only one direction of the fluid passage provided in the wide head or the nozzle block, whereas the temperature control fluid passing through the passage is provided. The flow directions are configured to be opposite to each other. Thereby, the temperature gradient of the temperature control fluid passing through the passage is leveled, and the temperature distribution is made uniform throughout the wide head or the nozzle block.

The use of the fluid discharged from the discharge port and another fluid as the temperature control fluid enables independent temperature control. For example, as the fluid discharged from the discharge port, an ultraviolet curable type or a secondary liquid is used. It is suitable for those using a liquid reaction type coating agent or the like. These reaction-type coating agents cannot heat the entire system because the reaction by heat proceeds with time. Therefore, stable application is performed by uniformly heating the reactive coating agent immediately before being discharged from the discharge port through the heated temperature control fluid through the fluid passage of the wide head or the nozzle block. In the case of handling these reactive fluids, it is desirable that the temperature control fluid passage be provided as close to the tip of the discharge port as possible.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a method for stabilizing the temperature of a wide head or a nozzle block according to the present invention. FIG. 1 is an explanatory view of a method for stabilizing the temperature of a discharge head or a nozzle block using the same liquid or melt as the liquid for controlling the temperature, which is discharged from a discharge port according to the present invention. In this example, a pair of the passages is constituted. This discharge nozzle device 1
Two nozzle blocks 2 and 3 are provided, and the nozzle blocks 2 and 3 are fastened by a plurality of bolts 5 with a shim plate 4 having a cut-out lower intermediate portion therebetween while facing each other. The notch of the shim plate 4 and the facing wall surfaces of the nozzle blocks 2 and 3 form a wide slot-shaped discharge port 6.

The nozzle blocks 2 and 3 have at least one pair of fluid passages 7 in the longitudinal direction of the nozzle blocks 2 and 3.
a and 7b are provided. In the present embodiment, one fluid passage 7 a is provided in the nozzle block 2 and one fluid passage 7 b is provided in the nozzle block 3.
a and 7b form a pair. It is not necessarily limited to one pair, and a fluid passage may be provided only in any one of the nozzle blocks. Here, the case described in claim 3 is described for convenience. Further, the number of fluid passages 7 is not limited to being provided one for each nozzle block, and a plurality of fluid passages may be provided. In this case, it is desirable that the number of holes be a number that forms a pair so that temperature control fluids that flow in opposite directions can be passed in consideration of the temperature balance.

Reference numeral 8 denotes an air-operated opening / closing valve. Although the opening / closing valve 8 is illustrated in a separate and independent form in the drawing, the opening / closing valve 8 and the nozzle block 2 are actually assembled integrally. I have. The discharge hole 8a of the on-off valve 8 is
Is connected to a receiving hole 2a provided on the upper surface, that is, a receiving hole 2a for a liquid or a molten material, and the receiving hole 2a is further connected to the above-described wide discharge port 6 through a through hole 2b.

Reference numeral 9 denotes an electromagnetic valve for control air. The electromagnetic valve 9 is opened and closed by a control signal from a control device (not shown). The control air from the air supply source 10 is supplied to the actuator of the air-operated on-off valve 8 by opening and closing the solenoid valve 9 to open and close the on-off valve 8.

Reference numeral 11 denotes a coating agent delivery unit, that is, a liquid or melt delivery unit. The delivery unit 11 pumps the liquid tank 13 for storing the coating agent 12 and the coating agent 12 in the liquid tank 13. A pump 14 for pumping, a temperature controller 15 for adjusting the temperature of the coating agent 12 pumped from the pump 14 to a predetermined temperature, and a pressure regulating valve incorporated in a return circuit of the circulating coating agent to keep the pressure in the circulation circuit constant. 16 or the like. When handling the melt, the liquid tank 13 incorporates the Peter 17.

The coating agent 12 pressure-fed from the delivery unit 11 passes through a pipe 18 such as a hose, and
8, one of the flows is supplied to the on-off valve 8, and the other flow is divided into
The fluid is supplied to a pair of fluid passages 7a and 7b provided in the nozzle blocks 2 and 3, and passes through the fluid passages in opposite directions. In the case where one fluid passage is provided only in one of the nozzle blocks, the fluid is naturally supplied to the one fluid passage as a one-way flow. The coating agent 12 supplied to the on-off valve 8 is supplied to the nozzle block 2 when the on-off valve 8 is opened.
Through the receiving hole 2a and the through hole 2b.
Is spread and discharged to a wide area from the downstream.

After passing through the fluid passages 7a and 7b, the coating agent 12 supplied to the pair of fluid passages 7a and 7b is again merged into a single conduit 20, and the return circuit of the delivery unit 11, that is, The pressure is returned to the pressure regulating valve 16. At this time, the coating agent 12 in the fluid passages 7a and 7b
Are configured to flow in opposite directions. The coating agent 12 that has passed through the pressure regulating valve 16 is connected to the suction pipe of the pump 14 and circulates.

Reference numeral 21 denotes a part of a long base material which is continuously moved in the direction of the arrow by a conveyor device or the like (not shown), and the coating material spread and discharged from the slot-shaped discharge port 6 in a wide direction toward the downstream. The state in which the material 12 is applied to the upper surface of the substrate 21 is shown.

In this embodiment, as described above, the coating agent 12 whose temperature has been sufficiently controlled by the delivery unit 14 is
While being discharged from the discharge port 6 and applied on the substrate 21,
A part of the coating agent whose temperature is controlled the same as the discharged coating agent is passed through the fluid passages 7a and 7b provided in the nozzle blocks 2 and 3, thereby playing a role of preventing a temperature change of the nozzle block. According to this method, the structure is simpler than that of the conventional casting heater or cartridge heater system, and there is no need to provide a special circulation unit for heating, and the whole apparatus can be designed to be compact.

Further, by designing the flow rate of the coating agent passing through the fluid passage 7 to be 10 meters per minute or more, the temperature gradient from the entrance to the exit when the coating agent passes through the fluid passage 7 is reduced. Therefore, it is possible to control the temperature to a uniform temperature distribution throughout the wide head or the nozzle block.

In this embodiment, the coating agent 12 fed from the delivery unit 11 is branched by a branch pipe 19 provided in the middle of a pipe 18, and one of the flows is sent to the on-off valve 8.
As another flow, a flow that is supplied to the fluid passage 7 provided in the nozzle blocks 2 and 3 is described.
As shown by a dotted line, a branch pipe 19 ′ is connected to a pipe 20 of a return circuit from the fluid passage 7 provided in the nozzle blocks 2 and 3.
And the coating agent 12 that has passed through the fluid passages 7 of the nozzle blocks 2 and 3 may be supplied to the on-off valve 8.

In this case, the branch pipe 19 'provided in the pipe 20
The flow rate of the coating agent 12 discharged from the discharge port 6 and the flow rate of the coating agent 12 discharged from the discharge port 6 to the suction pipe side of the pump 14 are designed to be substantially equal to each other. , An open / close valve 27 is provided in series with either the front side or the rear side of the pressure regulating valve 16.
7 is operated in synchronization with the opening / closing operation of the opening / closing valve 8, that is, when the opening / closing valve 8 is closed, the opening / closing valve 27 is opened to turn on the return circuit, and when the opening / closing valve 8 is opened, the opening / closing valve 27 is opened.
Is closed and the return circuit is turned off, thereby stabilizing the temperature of the nozzle block and the pump 1 in the delivery unit 11.
A pump having a relatively small capacity can be employed.

Also, a slot-shaped discharge port structure has been described as an example. However, the present invention is not limited to such a shape. For example, a plurality of independent discharge holes are provided in the longitudinal direction to increase the width. A wide head or a nozzle device structure that expands is also conceivable, and a liquid or melt discharged from a discharge nozzle is acted on by a gas or the like such as assist air to turn the discharged liquid or melt into particles or stretched. The present invention can also be applied to a wide head or a nozzle block (for example, Japanese Patent Application Laid-Open No. 6-170308) which forms a fiber. Further, the relationship between the nozzle tip and the base material does not matter whether it is in a contact state or a separated state.

Next, the embodiment shown in FIG. 2 will be described. FIG. 2 shows an embodiment corresponding to claims 4 and 5, in which a fluid different from a liquid or a melt discharged from a discharge port is used as a temperature control fluid. . That is, reference numeral 25 denotes a coating liquid supply device, and the coating liquid (the coating agent 12) pumped from the coating liquid supply device 25 is directly connected to the on-off valve 8 via a pipe 26 such as a hose.
Supplied to On the other hand, the delivery unit 11 functions as a delivery unit for the fluid for temperature control. Then, the temperature control fluid whose temperature has been sufficiently controlled by the delivery unit 11 is supplied to a pair of fluid passages 7a and 7b provided in the nozzle blocks 2 and 3 through a pipe 18, and flows in opposite directions. Let it pass. Other functions are the same as those in FIG. 1 described above, and the description is omitted.

[0031]

As described above, according to the method for stabilizing the temperature of the wide head or the nozzle block of the present invention, the same fluid as the liquid or the melt discharged from the discharge port is used, and the structure is extremely simple and inexpensive. In the method of stabilizing the temperature of the wide head or the nozzle block, and in the method using a separate temperature control fluid, the temperature gradient is reduced and the temperature distribution is biased over the entire wide head or the nozzle block. And a method for stabilizing the temperature of the wide head or the nozzle block.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a method for stabilizing the temperature of a wide head or a nozzle block according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a method for stabilizing the temperature of a wide head or a nozzle block according to a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Discharge nozzle apparatus, 2 ... Nozzle block, 3 ... Nozzle block, 6 ... Discharge port, 7a ... Fluid passage, 7b ... Fluid passage, 11 ... Delivery unit, 12 ... Coating agent, 21
... Base material, 25 ... Coating liquid supply device.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D075 AC04 AC84 AC96 CA47 EA05 4F033 BA03 DA01 EA01 HA03 LA13 NA01 4F041 AA02 AB01 BA05 BA12 BA46 4F042 AA02 BA19 CB26

Claims (5)

[Claims] 1. A method for stabilizing the temperature of a wide head or a nozzle block in which a heated liquid or a molten material is spread widely downstream of the discharge port via a discharge port. A wide head or nozzle book, wherein at least one liquid or melt passage is provided in the longitudinal direction, and the same liquid or melt as the liquid or melt discharged from the discharge port is passed through the passage. Temperature stabilization method. 2. The method for stabilizing the temperature of a wide head or a nozzle block according to claim 1, wherein the flow rate of the liquid or the melt passing through the fluid passage is 10 meters or more per minute. 3. A liquid or melt passage provided in the longitudinal direction of the wide head or the nozzle block is formed in at least one pair, and the flow directions of the liquid or melt passing through the passage are opposite to each other. The method for stabilizing the temperature of a wide head or a nozzle block according to claim 1 or 2, wherein the flow is performed so as to flow. 4. A liquid or a melt is supplied through a discharge port,
A method for stabilizing the temperature of a wide head or a nozzle block to be spread widely downstream of a discharge port, wherein at least one pair of fluid passages is provided in the longitudinal direction of the wide head or the nozzle block, and a temperature controlling fluid is provided in the passage. A method for stabilizing the temperature of a wide head or a nozzle block, characterized in that the flow is performed so as to flow in opposite directions. 5. The method for stabilizing the temperature of a wide head or a nozzle block according to claim 4, wherein the flow rate of the temperature control fluid passing through the fluid passage is 10 meters or more per minute.