KR20220083670A - blow nozzle - Google Patents

Abstract

The blow nozzle according to the present invention is a blow nozzle that blows air out of a film to be conveyed, is formed in the vicinity of an air blow position in the inside of the blow nozzle, is an opening surface of an opening of the blow nozzle, and blows out air An interior portion having an inclined surface inclined with respect to an imaginary surface passing through the opening surface and inclined in a manner adjacent to each other with respect to the imaginary surface is provided.

Description

blow nozzle

The present invention relates to a blowout nozzle.

As a manufacturing method of the stretched film which consists of a thermoplastic resin, the sequential biaxial stretching method and the simultaneous biaxial stretching method are known. In the sequential biaxial stretching method, a uniaxially oriented film is obtained by stretching an unstretched film made of a thermoplastic resin in the longitudinal direction, and then the obtained uniaxially oriented film is introduced into a tenter oven, and is stretched in the width direction therein. In the simultaneous biaxial stretching method, an unstretched film made of a thermoplastic resin is introduced into a tenter oven, and is simultaneously stretched in the longitudinal direction and the width direction in the oven.

BACKGROUND ART Stretched films made of thermoplastic resins are widely used for packaging applications, as well as for various industrial material applications. Among them, sequential biaxially stretched films of polyester, polyolefin, or polyamide resins are widely used in applications that cannot withstand use as unstretched films due to their excellent mechanical properties, thermal properties, electrical properties, etc., and the demand is also increasing.

As a problem of the tenter oven for producing a stretched film made of a thermoplastic resin, the circulation of air in the chamber constituting the tenter oven is not completed, and air having a different set temperature flows into an adjacent chamber, or outside air from the outside of the tenter oven. There exists a phenomenon that the air flows into the oven, or the air in the room of the tenter oven is blown out of the oven. All of these phenomena are phenomena in which air flows in the running direction of the film, and this flow of air is called MD (Machine Direction) flow. The MD flow is generated due to an accompanying airflow when the film travels or a deviation between the amount of air supplied to the heated air supplied into the tenter oven and the exhaust amount of the air discharged from the tenter oven, and the like.

When MD flow occurs, the air of different temperatures flowing in from the outside flows through the vicinity of the film and mixes with the indoor heating air, so there is a non-uniformity in the efficiency of heating the film, resulting in a large temperature non-uniformity in the film. In the tenter oven, at least one of a preheating step of raising the temperature of the film to a desired temperature, a stretching step of widening the film to a desired width, a heat setting step of heat-treating the film at a desired temperature, and a cooling step of cooling the film to a desired temperature One process is performed. In any of these processes, when a temperature nonuniformity occurs in a film, it becomes a cause of the film thickness nonuniformity and characteristic nonuniformity, and the quality of a product falls. In addition to deterioration of product quality, there are cases in which film tearing occurs in the tenter oven, resulting in reduced productivity.

It is a technology to prevent air from entering the tenter oven from the outside or from blowing out of the indoor air to the outside of the tenter oven by the MD type. The technique which blows off and blocks|blocks the flow of air is known (for example, refer patent document 1).

International Publication No. 2017/115654

By the way, in the manufacturing apparatus of a stretched film, it is preferable from the viewpoint of apparatus structure to install a film and a blow-out nozzle apart. However, if the distance between the film and the ejection nozzle is increased, the wind pressure of the air ejected from the ejection nozzle is lowered, and the MD flow cannot be blocked. The temperature nonuniformity in the film vicinity or tenter oven will become large.

This invention was made in view of the said subject, and even if it enlarges the distance between a film, it aims at providing the ejection nozzle which can suppress temperature nonuniformity.

In order to solve the above problems, the blowing nozzle according to the present invention is a blowing nozzle that blows air out of a film to be conveyed, and is installed in the inside of the blown nozzle near the blowing position of the air, the opening of the blowing nozzle is It is an opening surface, and it is characterized by comprising: an inner snow part having an inclined surface inclined with respect to an imaginary surface passing through the opening surface for blowing out the air, and inclined in a manner adjacent to each other with respect to the imaginary surface.

In addition, the ejection nozzle according to the present invention is characterized in that it further includes a protrusion having an inclined surface that protrudes from the inner snow portion to the outside of the opening and is inclined with respect to the virtual surface in the above invention.

In addition, in the blowing nozzle according to the present invention, in the above invention, the openings are formed of first to third openings independent of each other, and the internal portion is formed between the first opening and the second opening, and with respect to the virtual surface, It is characterized in that it has a first internal portion having an inclined surface, and a second inner portion formed between the second opening and the third opening and having an inclined surface inclined with respect to the virtual surface.

In addition, the ejection nozzle according to the present invention further includes a protrusion having an inclined surface that protrudes from the inner snow portion to the outside of the opening and is inclined with respect to the imaginary surface in the present invention, wherein the protrusion includes the first opening and the second opening. a first protrusion formed between the openings and having an inclined surface inclined with respect to the imaginary surface, and a second protrusion formed between the second opening and the third opening and having an inclined surface inclined with respect to the imaginary surface; do it with

(Effects of the Invention)

According to this invention, even if it enlarges the distance between a film, the effect that temperature nonuniformity can be suppressed is shown.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure of the film manufacturing apparatus provided with the ejection nozzle by one Embodiment of this invention.
It is sectional drawing of the film manufacturing apparatus corresponding to the AA cross section shown in FIG.
Fig. 3 is a cross-sectional view of the ejection nozzle corresponding to the cross section taken along line BB shown in Fig. 2 .
4 is a diagram showing the configuration of a blowout nozzle according to Modification 1 of the embodiment of the present invention.
5 is a diagram showing the configuration of a blowout nozzle according to a second modification of the embodiment of the present invention.
6 is a diagram showing the configuration of a blowout nozzle according to a third modification of the embodiment of the present invention.
It is a figure which shows the structure of the blowout nozzle by a comparative example.
It is a figure explaining the numerical analysis model used by the analysis example 2. FIG.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated in detail with drawings. In addition, this invention is not limited by the following embodiment. In addition, each drawing referenced in the following description is only schematically showing the shape, size, and positional relationship enough to understand the content of this invention. That is, the present invention is not limited only to the shape, size, and positional relationship illustrated in each drawing. In addition, in description of drawing, the same code|symbol is attached|subjected to the same part.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure of the film manufacturing apparatus provided with the ejection nozzle by one Embodiment of this invention. It is sectional drawing of the film manufacturing apparatus corresponding to A-A cross section shown in FIG. The film manufacturing apparatus 1 shown in FIGS. 1 and 2 is equipped with the airflow control apparatus 2 and the tenter oven 3 . The film manufacturing apparatus 1 is a manufacturing apparatus of a stretched film employing a sequential biaxial stretching method or a simultaneous biaxial stretching method, and introduces an unstretched film made of a thermoplastic resin into the tenter oven 3, and the tenter oven 3 At least one of the longitudinal direction and the width direction of the unstretched film 100 is stretched within. In addition, in FIG. 1, the longitudinal direction of the film 100 is conveyance direction FR of a film, and corresponds to the left-right direction of a figure. The width direction (film width direction) of the film 100 is a direction orthogonal to the longitudinal direction and thickness direction (paper up-down direction) of a film, and corresponds to the direction orthogonal to the paper surface.

The airflow control device 2 is installed in the front end of the tenter oven 3 with respect to the conveyance direction of the film 100. The film 100 to be stretched is introduced into the tenter oven 3 after passing through the airflow control device. The airflow control device 2 connects to the tenter oven 3 via a connection 4 .

There is no limitation in particular in the film applicable to the airflow control apparatus 2 of this invention, A well-known thermoplastic resin film heated and extended|stretched in the tenter oven 3 is applicable.

The tenter oven 3 is heated to a temperature set when the inside of the film 100 is stretched. One end of the tenter oven 3 is connected to the connection part 4 , and an opening for discharging the film 100 to the outside is formed at the other end.

The airflow control device 2 includes a first blowing nozzle 21 provided to face one surface (upper surface in FIG. 1) of the film 100, and the other surface (lower surface in FIG. 1) of the film 100. It has the 2nd blow-out nozzle 22 which opposes and is provided. Hereinafter, the "first blowing nozzle 21" is simply called "the blowing nozzle 21". In addition, the "2nd blowout nozzle 22" is simply called "the blowout nozzle 22". The blowing nozzles 21 and 22 blow out air with respect to the surface of the film 100 facing each other. The ejection nozzles 21 and 22 are accommodated in the box-shaped body 20 . One end of the box-shaped body 20 in the transport direction of the film 100 is connected to the connecting portion 4 , and an opening for carrying in the film 100 from the outside is formed at the other end. Even if the number of the blowing nozzles opposed to each other is one pair, it is effective, but if there are a plurality of pairs, the effect becomes higher.

The airflow control device 2 is provided with blowers B1 and B2, heat exchangers H1 and H2, and exhaust mechanisms E1 and E2 as a supply source of air to the blowing nozzles 21 and 22 . The blower B1 takes in and blows out external air. The heat exchanger H1 heats the air blown out by the blower B1. The exhaust mechanism E1 receives the air heated in the heat exchanger H1 and sends it to the blower B1. The blower B2, the heat exchanger H2, and the exhaust mechanism E2 each have the same function as the blower B1, the heat exchanger H1, and the exhaust mechanism E1 mentioned above.

The blower B1 and the exhaust mechanism E1 are connected by a duct D11. The blower B1 and the heat exchanger H1 are connected by a duct D12. The heat exchanger H1 and the blow-out nozzle 21 are connected by the duct D13. In the airflow control device 2, the air blown out from the blower B1 is heated in the heat exchanger H1, and the heated air is sent to the blowout nozzle 21 by the duct D13. The blowing nozzle 21 blows out the air introduced through the duct D13. Further, the exhaust mechanism E1 is provided with exhaust portions E11 and E12 for sucking in the air blown out by the blowing nozzle 21 or the air loaded in the MD stream. The exhaust portions E11 and E12 have openings for sucking air into the exhaust mechanism E1, and the openings are formed in the shape of a hole or a slit. In this embodiment, the exhaust part E11 is formed in the front end of the ejection nozzle 21 in the longitudinal direction (conveyance direction FR) of the film 100, and the exhaust part E12 is formed in the rear end.

Moreover, the blower B2 and the exhaust mechanism E2 are connected by the duct D21. The blower B2 and the heat exchanger H2 are connected by a duct D22. The heat exchanger H2 and the blow-out nozzle 22 are connected by the duct D23. In the airflow control device 2, the air blown out from the blower B2 is heated in the heat exchanger H2, and the heated air is sent to the blowout nozzle 22 by the duct D23. The blowing nozzle 22 blows out the air introduced through the duct D23. Further, the exhaust mechanism E2 is provided with exhaust portions E21 and E22 that suck in the air blown out by the blowing nozzle 22 or the air loaded in the MD stream. The exhaust portions E21 and E22 have openings for sucking air into the exhaust mechanism E2, and the openings are formed in the shape of a hole or a slit. In this embodiment, the exhaust part E21 is formed in the front end of the ejection nozzle 22 in the longitudinal direction (conveyance direction FR) of the film 100, and the exhaust part E22 is formed in the rear end.

In addition, you may adjust the amount of blown air by providing a supply air damper (not shown) in the ducts D13, D23, and changing the opening degree of this air supply damper. The supply air damper may be replaced with a valve, plate, orifice, or the like. By adjusting the amount of blown air from the blowing nozzles 21 and 22, the energy consumption required for heating the air can be reduced.

Further, an exhaust damper (not shown) may be provided in the ducts D11 and D21, and the amount of air sucked by the exhaust portions E11, E12, E21, and E22 may be adjusted by changing the opening degree of the exhaust damper. The exhaust damper may be replaced with a valve, plate, orifice, or the like. The thermal loss can be reduced by adjusting the amount of air sucked from the exhaust portions E11, E12, E21, and E22.

In general, in the tenter oven 3 to change the width of the film 100 to be conveyed according to the production type of the film 100, a clip holding both ends of the film 100 and a rail covering the clip rail (not shown) The distance between the covers 51 and 52 is widened or narrowed in the width direction. The rail covers 51 and 52 and the ejection nozzles 21 and 22 are installed at positions where they do not interfere with each other. For example, when the distance between the ejection nozzles 21 and 22 disposed to face each other through the film 100 is small compared to the height of the rail covers 51 and 52 (distance in the thickness direction of the film 100 ), the rail It is preferable to provide a mechanism for widening or narrowing the width of the ejection nozzles 21 and 22 according to the width of the film 100 so that the covers 51 and 52 and the ejection nozzles 21 and 22 do not interfere with each other. do. When the width of the film 100 is widened, an air curtain extending in the film width direction is formed by increasing the length of the ejection nozzles 21 and 22 in the film width direction while avoiding contact or interference with the rail covers 51 and 52. can

Next, the structure of a blowout nozzle is demonstrated. FIG. 3 is a cross-sectional view of a blowout nozzle corresponding to a cross section taken along line B-B shown in FIG. 2 . Although the structure of the blowout nozzle 22 is demonstrated as an example in FIG. 3, it has a similar structure also about the blowout nozzle 21. As shown in FIG. The blowing nozzle 22 includes a pressure equalization chamber 221 to which air is supplied from the duct D23 , a discharge unit 222 extending from the pressure equalization chamber 221 and blowing air to the outside, and the inside of the discharge unit 222 . It has a dividing part 223 that divides the flow path of the air blown out from the blowing part 222 .

An opening 222a for blowing out air is formed in the blowing part 222 on the opposite side to the side leading to the pressure equalization chamber 221 . The opening 222a is formed as a slit extending in the film width direction (refer to FIG. 2). In addition, the air blowing opening part 222a may not be a slit shape, but a several hole shape may be arranged in the film width direction. The end surface of the take-out part 222 on which the opening part 222a is formed is parallel to the conveyance direction FR of the film 100. The ejection portion 222 is formed with inclined surfaces 222b and 222c in which a part of the side surface on the side of the opening 222a is inclined with respect to the conveyance direction FR of the film 100 . These inclined surfaces 222b and 222c are inclined in such a manner that they approach each other toward the opening surface of the opening 222a. In addition, the extraction part 222 may form the hollow prismatic shape which does not have the inclined surfaces 222b, 222c.

The dividing portion 223 has an inclined surface in which the ends on the side of the opening 222a are inclined toward each other toward the opening 222a. Specifically, the splitter 223 includes a base 223a extending in a prismatic shape from the pressure equalization chamber 221 , and is formed in the vicinity of an air blowout position in the blower 222 , and forms an opening 222a from the base 223a. ) has an inner snow portion (223b) extending to the side. In the inner portion 223b, inclined surfaces 223c and 223d that pass through the opening surface of the opening 222a and are inclined with respect to the imaginary surface S parallel to the opening surface are formed. The inclined surfaces 223c and 223d are inclined in such a manner that they approach each other toward the opening 222a. In the cross section shown in FIG. 3, the division|segmentation part 223 has comprised the outer edge of the pentagonal shape. The virtual surface S is parallel to the conveyance direction FR. In the present embodiment, the inclined surface 223c is parallel to the inclined surface 222b and the inclined surface 223d is parallel to the inclined surface 222c, respectively, but the inclined surface of the take-out part 222 and the inclined surface of the branching part 223 do not need to be parallel. none.

Here, L is the distance from the tip of the take-out unit 222 to the film 100, and the angle between the inclined surface of the dividing unit 223 (the inclined surface 223d in FIG. 3 ) and the virtual surface S is θ1 (>0). ) and the distance between the opening part 222a and the flow dividing part 223 in the film conveyance direction FR, let t be the distance on the virtual surface S. The distance L, the angle θ1, and the distance t are respectively determined based on the set pressure at the air stagnation point P1. Although the set pressure is set to 60 Pa, for example, what is necessary is just to set more than the pressure which can block MD flow, and it is not limited to 60 Pa. In addition, the stagnation point P1 corresponds to the stagnation position which generate|occur|produces with the air blown out from the blow-out part 222 in the film 100.

Next, the flow method of the air ejected from the blowing nozzles 21 and 22 will be described with the blowing nozzle 22 as an example. The air (hot air) supplied to the blowing nozzle 22 through the duct D23 is blown out toward the film 100 from the opening part 222a. The blowing direction of the air blown out from the opening 222a is controlled by the splitter 223 . Air blown out from the upstream side in the conveyance direction FR is blown out by the jetting part 233 inclined to the downstream side with respect to the film 100. In contrast, the air blown out from the downstream side in the conveyance direction FR is blown out by the jetting part 233 inclined to the upstream side with respect to the film 100 . Each of the air blown out from the upstream side and the downstream side advances in a direction crossing each other and merges between the blowing nozzle 22 and the film 100 . The merging of the air increases the wind pressure and increases the air volume per unit time. After confluence, the air advances in a direction orthogonal to the conveyance direction FR of the film 100 to contact the film 100 . After that, the air changes the flow direction of the film 100 to the upstream side and the downstream side in the conveying direction, collides with the air flowing into the box-shaped body 20, becomes return air, and is sucked into the exhaust parts E21 and E22, respectively ( see Fig. 1). The air blown out from the blowing nozzle 21 is also sucked into the exhaust portion E11 E12 in the same flow manner.

At this time, when the air flowing in through the lower surface of the film 100 from outside the apparatus along with the accompanying flow occurring in the film conveying direction flows into the box-shaped body 20 through the film inlet of the air flow control device 2, the ejection nozzle It is blocked by the air curtain formed by the air blown out from 22 to change the direction of the flow, and is sucked into the exhaust unit E21 together with the return air. In this way, when the exhaust unit E21 sucks the air flowing in from outside the device, the air flowing in from the outside of the airflow control device 2 flows into the tenter oven 3, and the temperature unevenness occurs in the tenter oven 3 it can be prevented The same applies to the air flowing into the box-shaped body 20 from the film inlet through the upper surface of the film 100 from outside the device.

In addition, when the air flowing in from the tenter oven 3 flows into the box-shaped body 20 from the lower surface side of the film 100 through the outlet (connection part 4) of the airflow control device 2, the blowing nozzle 22 It is blocked by the air curtain formed by the air blown out from the air, changes the direction of the flow, and is sucked into the exhaust unit E22 together with the return air. In this way, the exhaust unit E22 sucks the air flowing in from the tenter oven 3, so that the air heated from the inside of the tenter oven 3 is blown out to the outside of the tenter oven 3, and the It can prevent that the temperature of a work area is raised and the work environment around the tenter oven 3 is deteriorated. In addition, it can be prevented that the sublimate from the film 100 is deposited outside the tenter oven 3 and adheres to the surface of the film 100 , thereby reducing productivity as a foreign matter defect. The same applies to the air flowing into the box-shaped body 20 from the tenter oven 3 through the upper surface of the film 100 .

As described so far, the ejection nozzles 21 and 22 are respectively disposed to face each surface of the film 100 . At this time, when the blow-out nozzle is provided only on one side of the film 100, the MD flow becomes easy to flow in the side where the blow-out nozzle is not provided, and the air-flow dividing effect of the blow-out nozzle is reduced. A thermoplastic resin film is different from a material such as a fabric, so that it is difficult to permeate air. Therefore, when air is blown to only one side of the film 100, the film 100 is blown up by the wind pressure of the air, or the film 100 is blown down, or the flap of the film 100 is increased. .

In order to prevent flapping of the film 100, blow nozzles are provided on one side and the other side of the film 100, respectively, and the opening of the blowing nozzle on one side and the opening of the blowing nozzle on the other side of the film ( 100) to oppose each other. Since the effect of pressing the same position of the film 100 from one surface side and the other surface side by mutually opposing an opening part arises, it can prevent the film from flapping. Here, the projection area when the opening of the ejection nozzle on the one surface side where the openings face each other is projected onto the film 100, and the projection area when the opening of the ejection nozzle on the other surface side is projected onto the film 100 This refers to an overlapping state in at least part of it. At this time, when the size of the openings is the same, it is more preferable that the two projection areas completely overlap each other.

The airflow control apparatus 2 is an apparatus for dividing the airflow between the entrance of the film 100 to the tenter oven 3, and the outside of the tenter oven 3, and controlling the airflow. Therefore, when the airflow control apparatus 2 is installed adjacent to the upstream of the conveyance direction of the film 100 of the tenter oven 3, the air temperature blown out from the blow-out nozzle in the carry-in opening of the tenter oven 3 It is preferable to be equal to or higher than the air temperature outside the tenter oven 3 . This prevents the film 100 from being excessively cooled and a problem occurs in the preheating process in the tenter oven. In addition, when the airflow control device 2 is installed adjacent to the downstream side of the conveyance direction FR of the film 100 of the tenter oven 3, the air temperature blown out from the blowout nozzle is the export port of the tenter oven 3 It is preferable that it is equal to or higher than the air temperature of the tenter oven 3 outdoors in this. This prevents the film 100 from being excessively cooled and a problem occurring in the downstream process of the tenter oven 3 . In addition, it is preferable that the temperature of the air blown out from the blowing nozzle is below the glass transition point of the film 100. Thereby, it can suppress that the crystal structure of the film 100 which consists of a thermoplastic resin changes.

In the embodiment described above, in the blowing nozzles 21 and 22 for blowing out air, a jetting part having an inclined surface is formed inside the blowing part to divide the air blown out from the blowing part, and to merge between the blowing nozzle and the film 100 to make a film (100) was brought into contact with air. The air blown out by the blowing nozzles 21 and 22 increases in wind pressure by merging, and forms an air curtain for blocking the MD flow. According to this embodiment, since the air which increased wind pressure by merging contacts the film 100, even if it enlarges the distance between the film 100 and a blowout nozzle, temperature nonuniformity can be suppressed.

In addition, in the above-mentioned embodiment, it is good also as a structure in which the classification|shunt part 223 does not have the base part 223a. In this case, the jetting portion (inner snow portion 223b) is fixed to the inner wall intersecting the film width direction of the ejection nozzle 22 .

(Modification 1)

Next, Modification Example 1 of the embodiment will be described with reference to FIG. 4 . 4 is a diagram showing the configuration of a blowout nozzle according to Modification 1 of the embodiment of the present invention. The structure of the film manufacturing apparatus by the modification 1 is the same except having changed the structure of the ejection nozzle in the film manufacturing apparatus 1 mentioned above. Components identical to those described above are denoted by the same reference numerals. Hereinafter, although the structure of 22 A of blowout nozzles replacing the blowout nozzle 22 is demonstrated, the structure of the blowout nozzle which replaces the blowout nozzle 21 is also the same.

The blowing nozzle 22A includes a pressure equalization chamber 221 to which air is supplied from the duct D23 , a discharge unit 222 extending from the pressure equalization chamber 221 and blowing air to the outside; It has a dividing part 224 that divides the flow path of the air blown out from the blowing part 222 .

The dividing part 224 has an inclined surface in which the ends on the side of the opening 222a are inclined toward each other toward the opening 222a. Specifically, the dividing portion 224 includes a base 224a extending in a prismatic shape from the pressure equalization chamber 221, and an inner portion ( 224b). The inner portion 224b has inclined surfaces 224c and 224d that are inclined with respect to the conveying direction of the film 100, and one end of the conveying direction FR leads to the inclined surface 224c, and the other end is connected to the inclined surface 224d. A flat portion 224e is formed. The inclined surfaces 224c and 224d are inclined in such a manner that they approach each other toward the opening 222a. The flat part 224e is parallel to the conveyance direction FR, and is located on the virtual surface S passing through the opening part 222a. As for the dividing part 224, the outer edge has comprised the trapezoid shape in the cross section shown in FIG. In addition, the flat portion 224e is preferably a surface approximately parallel to the virtual surface S, but extends from the inclined surface 224c and the inclined surface 224d, and is a curved surface connecting the inclined surface 224c and the inclined surface 224d. may be formed.

Let W be the distance in the conveyance direction FR of the flat part 224e here. The distance L, the angle θ1, the distance t, and the distance W are respectively determined based on the set pressure at the air stagnation point P1 (refer to FIG. 3).

Also in the modified example 1 described above, the air jetting unit 224 having an inclined surface is formed to divide the air blown out from the blower section 222, and the air is fed into the film 100 by merging between the blowout nozzle 22A and the film 100. was brought into contact with According to this modified example 1, since the air which increased wind pressure by merging contacts the film 100, even if it enlarges the distance between the film 100 and a blowout nozzle, temperature nonuniformity can be suppressed.

In addition, in the above-mentioned modification 1, it is good also as a structure in which the classification|shunt part 224 does not have the base part 224a. In this case, the branching part (inner snow part 224b) may be fixed to the inner wall which intersects the film width direction of 22 A of blowout nozzles.

(Modification 2)

Next, a second modification of the embodiment will be described with reference to FIG. 5 . 5 is a diagram showing the configuration of a blowout nozzle according to a second modification of the embodiment of the present invention. The structure of the film manufacturing apparatus by modification 2 is the same except having changed the structure of the ejection nozzle in the film manufacturing apparatus 1 mentioned above. Components identical to those described above are denoted by the same reference numerals. Hereinafter, although the structure of the blowing nozzle 22B replacing the blowing nozzle 22 is demonstrated, the structure of the blowing nozzle replacing the blowing nozzle 21 is also the same.

The blowing nozzle 22B includes a pressure equalization chamber 221 to which air is supplied from the duct D23 , a discharge unit 222 extending from the pressure equalization chamber 221 and blowing air to the outside, and a discharge unit 222 . It has a dividing part 225 which divides the flow path of blown-out air.

The splitter 225 has inclined surfaces that are partially protruded from the inside of the ejection unit 222 and inclined toward the side opposite to the pressure equalization chamber 221 side. Specifically, the dividing unit 225 is formed in the blowing unit 222, an internal dividing unit 225a dividing the flow of air, and an external dividing unit (225a) protruding from the blowing unit 222 and dividing the air ( 225b). As for the dividing part 225, the outer edge has comprised the pentagonal shape in the cross section shown in FIG.

The inner flow dividing portion 225a has a base 225c extending from the pressure equalization chamber 221 , and an internal portion 225d formed in the ejection portion 222 and extending from the base 225c toward the opening 222a side. In the inner portion 225d, inclined surfaces 225e and 225f inclined with respect to the virtual surface S and one end in the conveying direction FR lead to the inclined surface 225e, and the other end leads to the inclined surface 225f, and the external classification A connection portion 225g for connecting to the portion 225b is formed. The inclined surfaces 225e and 225f are inclined in such a manner that they approach each other toward the opening 222a. The connection part 225g is parallel to the conveyance direction FR, and is located on the virtual surface S passing through the opening part 222a.

The external dividing part 225b forms a triangular prism shape extending in the film width direction, and has two inclined surfaces inclined with respect to the virtual surface S. In addition, the front-end|tip of the external dividing part 225b may be a plane substantially parallel to the virtual surface S, and a curved surface may be sufficient as it. 5, each inclined surface of the external dividing part 225b is inclined at the same angle as the inclined surfaces 225e and 225f with respect to the virtual surface S, but it is good also as a different angle. The outer dividing portion 225b corresponds to the protrusion.

Here, the distance W in the conveyance direction FR of the connection portion 225g is W, the angle formed by the inclined surface of the inner flow dividing portion 225a (the inclined surface 225f in FIG. 5) and the virtual surface S is θ1 (> 0), An angle between the inclined surface of the external classification unit 225b and the virtual surface S is referred to as θ2 (>0). The distance L, the angles θ1 and θ2, the distance t, and the distance W are respectively determined based on the set pressure at the air stagnation point P1 (refer to FIG. 3). In addition, the distance L in Modification Example 2 becomes the distance from the front-end|tip of the external dividing part 225b to the film 100.

Also in the modified example 2 described above, the air jetting unit 225 having an inclined surface is formed to divide the air blown out from the blower section 222 , and merge between the blowout nozzle and the film 100 so that the air is brought into contact with the film 100 . did. According to this modified example 2, since the air which increased the wind pressure by merging contacts the film 100, even if it enlarges the distance between the film 100 and a blowout nozzle, temperature nonuniformity can be suppressed.

In addition, although the example in which the external dividing part 225b continues to the connection part 225g in the modified example 2 was demonstrated, two openings extending in the film width direction are formed in the ejection part 222, and the ejection part is formed between these openings. It may be supported on the outer surface of 222 . In addition, also in the inner flow dividing part 225a, the thing supported by the inner wall of the extraction part 222 between openings may be sufficient.

In addition, in the second modification, the inner splitter 225a and the outer splitter 225b may be integrally formed.

(Modified example 3)

Next, a modified example 3 of the embodiment will be described with reference to FIG. 6 . 6 is a diagram showing the configuration of a blowout nozzle according to a third modification of the embodiment of the present invention. The structure of the film manufacturing apparatus by modification 3 is the same except having changed the structure of the ejection nozzle in the film manufacturing apparatus 1 mentioned above. Components identical to those described above are denoted by the same reference numerals. Hereinafter, although the structure of 22 C of blowing nozzles replacing the blowing nozzle 22 is demonstrated, the structure of the blowing nozzle replacing the blowing nozzle 21 is also the same.

The blowing nozzle 22C includes a pressure equalization chamber 221 to which air is supplied from the duct D23 , a discharge unit 222 extending from the pressure equalization chamber 221 and blowing air to the outside, and a discharge unit 222 . It has a dividing part 226 which divides the flow path of blown-out air.

Three openings (openings 222d to 222f) are formed in the blowout portion 222 of the blowout nozzle 22C. All of the openings 222d to 222f form a hole shape extending in the film width direction. As for the opening parts 222d-222f, opening part 222d, 222e, 222f is arrange|positioned in order from the upstream of the conveyance direction FR.

The flow dividing part 226 has inclined surfaces that are partially protruded from the inside of the blow-out part 222 and inclined toward the side opposite to the pressure equalization chamber 221 side. Specifically, the dividing portion 226 has an inner tongue 226a formed in the ejection portion 222 and a protrusion 226b protruding from the ejection portion 222 . The inner portion 226a is supported on the inner wall of the extraction portion 222 between the opening 222d and the opening 222e and between the opening 222e and the opening 222f. Further, the protrusion 226b is supported on the outer surface of the extraction portion 222 between the opening 222d and the opening 222e and between the opening 222e and the opening 222f.

The inner snow portion 226a has a first inner snow portion 226c formed on the upstream side with respect to the conveyance direction FR, and a second inner snow portion 226d formed on the downstream side.

The projection 226b has a first projection 226e formed on the upstream side with respect to the conveying direction FR, and a second projection portion 226f formed on the downstream side.

An inclined surface 226g is formed on the side of the opening 222d in the first inner portion 226c.

In the second inner portion 226d, an inclined surface 226h is formed on the side of the opening 222f.

Both inclined surfaces 226g and 226h incline with respect to the virtual surface S, and incline in such a manner that they approach each other toward the opening 222a.

An inclined surface 226i leading to the inclined surface 226g is formed on the first protrusion 226e.

An inclined surface 226j leading to the inclined surface 226h is formed on the second protrusion 226f.

The inclined surfaces 226i and 226j are both inclined with respect to the virtual surface S, the inclined surface 226i faces the opening 222d, and the inclined surfaces 226j are inclined toward the opening 222f away from each other. In other words, the inclined surfaces 226i and 226j are inclined in such a manner that they approach each other toward the end (tip) on the opposite side to the inner snow portion 226a side. In addition, the front-end|tip of the 1st protrusion part 226e or the 2nd protrusion part 226f may be substantially parallel to the virtual surface S, and a curved surface may be sufficient as it. 6, although the angle with respect to the virtual surface S differs from the angle of the inclined surface 226g in FIG. 6, it is good also as the same angle. The same applies to the inclination angle of the inclined surface 226j and the inclination angle of the inclined surface 226h.

In the inner portion 226a and the projecting portion 226b, among the openings 222d to 222f, the wall surface on the side of the opening 222e located in the center of the conveying direction FR is orthogonal to the conveying direction FR. In addition, this wall surface may incline with respect to the conveyance direction FR, and the inclination angle of the wall surface of the inner snow part 226a and the wall surface of the protrusion part 226b may mutually differ.

Here, in the conveying direction FR, the distances of the openings 222d to 222f are t1 to t3, respectively, the distance between the openings 222d and 222e is W1, and the distance between the openings 222e and 222f is The distance W2, the angle between the inclined surface of the inner snow part 226a (the inclined surface 226h in FIG. 6) and the virtual surface S is θ1 (>0), and the inclined surface of the protrusion 226b (the inclined surface 226j in FIG. 6) ) and the angle formed by the virtual surface S is called θ2 (>0). The distance L, the angles θ1 and θ2, the distances t1 to t3, and the distances W1 and W2 are respectively determined based on the set pressure at the air stagnation point P1 (refer to Fig. 3). . In addition, the distance L in the modified example 3 turns into the distance from the front-end|tip of the protrusion part 226b to the film 100. The distances t1 to t3 may be the same length or different, but the distance t1 and the distance t3 are preferably the same length.

Also in the modified example 3 described above, the jetting part 226 having an inclined surface is formed to divide the air blown out from the blowout section 222, merge between the blowout nozzle and the film 100, so that the air is brought into contact with the film 100. did. According to this modified example 3, since the air which increased the wind pressure by merging contacts the film 100, even if it enlarges the distance between the film 100 and a blow-out nozzle, temperature nonuniformity can be suppressed.

Moreover, it is good also as a structure which does not have the protrusion part 226b in the modification 3 mentioned above. In this case, the dividing portion 226 is constituted only by the inner snow portion 226a (the first inner snow portion 226c and the second inner snow portion 226d).

In addition, although the above-mentioned embodiment and Modifications 1 - 3 demonstrated that the inclined surface formed in a flow division part forms a planar shape, it is not limited to this, For example, you may comprise the curved surface shape or the wavefront shape.

(Example)

EXAMPLES Hereinafter, the detail of this invention is further demonstrated by an Example. In addition, this invention is not limited and interpreted by this Example.

[Interpretation 1]

Hereinafter, in the Example, the parameter of the blow-out nozzle was set about each structural example of embodiment mentioned above, and wind pressure (air volume) was analyzed. The analysis calculated|required the air volume when the wind pressure became 60 Pa in the above-mentioned stagnation point. In the Example, when the calculated|required air volume is small compared with the comparative object, if the effect of air volume increase was recognized as a blow-out nozzle, it was judged as (circle), and when it was not recognized, it was judged as x.

(Example 1)

In the ejection nozzle 22 shown in Fig. 3 , the distance t was analyzed as 12 mm, the distance L as 150 mm, and the angle θ1 as 70 deg. Table 1 shows each parameter and analysis result.

(Example 2)

In the ejection nozzle 22A shown in Fig. 4, the distance t was analyzed as 5 mm, the distance L was 150 mm, the distance W was 2 mm, and the angle θ1 was 70deg. Table 1 shows each parameter and analysis result.

(Example 3)

It analyzed as the parameter similar to Example 2 except having set the distance t to 12 mm. Table 1 shows each parameter and analysis result.

(Example 4)

In the ejection nozzle 22B shown in Fig. 5, the distance t is 12 mm, the distance L is 150 mm, the distance W is 5 mm, the angle θ1 is 70deg, the angle θ2 is 65deg, interpreted. Table 1 shows each parameter and analysis result.

(Example 5)

It analyzed as the parameter similar to Example 4 except having made the distance W into 10 mm. Table 1 shows each parameter and analysis result.

(Comparative Example 1)

Analysis was performed using the ejection nozzle 300 shown in FIG. It is a figure which shows the structure of the blowout nozzle by a comparative example. The blowing nozzle 300 includes, for example, a pressure equalization chamber 301 to which air is supplied from the duct D23 , and a blowout unit 302 extending from the pressure equalization chamber 301 and blowing air out of the opening 302a to the outside. ) and a jetting part 303 formed in the blowing part 302 and dividing the flow path of the air blown out from the blowing part 302 . The classification unit 303 extends to form a prismatic shape. In the ejection nozzle 300 , the distance from the tip of the ejection unit 302 to the film 100 is L, passes through the opening surface (end surface) of the ejection unit 302, and a plane parallel to the opening surface is defined as _S300 , the angle between the flow dividing section 303 and the virtual plane S ₃₀₀ is θ1 (> 0), the distance between the opening 302a and the jetting section 303 in the film conveying direction FR, and the virtual plane ( The distance on S ₃₀₀ ) is called t1.

In Comparative Example 1, in the ejection nozzle 300, the distance t was 5 mm, the distance L was 150 mm, the distance W was 2 mm, and the angle θ1 was analyzed as 90 deg. Table 1 shows each parameter and analysis result.

(Comparative Example 2)

It analyzed as the parameter similar to the comparative example 1 except having made the distance t into 12 mm. Table 1 shows each parameter and analysis result.

(Comparative Example 3)

It analyzed as the parameter similar to the comparative example 2 except having made the distance L into 50 mm. Table 1 shows each parameter and analysis result.

In Comparative Example 1, an air volume of 9.0 m 3 /min/m is required to set the wind pressure at the stagnation point to 60 Pa. In contrast, in Example 2 where the distances t and L were the same, it was 8.5 m 3 /min/m.

Further, in Comparative Example 2, an air volume of 19.2 m 3 /min/m is required to set the wind pressure at the stagnation point to 60 Pa. On the other hand, in Examples 1 and 3 to 5 in which the distances t and L were the same, the air volume was smaller than 19.2 m 3 /min/m, respectively. Moreover, in the comparative example 3, it became the analysis result that the wind pressure of a stagnation point did not reach 60 Pa.

(Example 6)

In the ejection nozzle 22C shown in Fig. 6, the distances t1 and t3 are 8 mm, the distance t2 is 8 mm, the distance L is 150 mm, the angle θ1 is 62 deg, and the angle θ2 is 45 deg. interpreted as Table 2 shows each parameter and analysis result.

(Example 7)

It analyzed as the parameter similar to Example 6 except having made the distance W into 15 mm. Table 2 shows each parameter and analysis result.

(Example 8)

It analyzed as the parameter similar to Example 7 except having made angle (theta)1 into 45deg. Table 2 shows each parameter and analysis result.

(Example 9)

It analyzed as the parameter similar to Example 7 except having made angle (theta)1 into 30 deg. Table 2 shows each parameter and analysis result.

(Example 10)

It analyzed as the parameter similar to Example 7 except having made angle (theta)1 into 80 deg. Table 2 shows each parameter and analysis result.

(Example 11)

It analyzed as the parameter similar to Example 7 except having made angle (theta)2 into 30 deg. Table 2 shows each parameter and analysis result.

(Example 12)

It analyzed as the parameter similar to Example 7 except having made angle (theta)2 into 80 deg. Table 2 shows each parameter and analysis result.

(Example 13)

It analyzed as the parameter similar to Example 6 except having made angle (theta)1 into 80 deg and angle (theta)2 into 10 deg. Table 2 shows each parameter and analysis result.

(Comparative Example 4)

It was set as the structure which does not form the classification|classification part 226, and the parameter other than that was carried out similarly to Example 6, and was analyzed. Table 2 shows each parameter and analysis result.

(Comparative Example 5)

It analyzed as the parameter similar to the comparative example 4 except having made the distance W into 15 mm. Table 2 shows each parameter and analysis result.

(Comparative Example 6)

The analysis was performed using the same parameters as those of Comparative Example 4, except that the protrusion 226b of the splitter 226 was formed and the angle θ2 was 45deg. Table 2 shows each parameter and analysis result.

Examples 6-13 require an air volume of 10.3-17.2 m3/min/m to set the wind pressure at the stagnation point to 60 Pa. In contrast, in Comparative Examples 4 and 5, the air volume was not obtained because the air volume was unstable, and Comparative Example 6 also required an air volume of 19.7 m 3 /min/m.

[Interpretation 2]

In Analysis 2, a numerical analysis model different from that of Analysis 1 was created, and numerical analysis was performed using this model to evaluate the blocking performance of MD types.

It is a figure explaining the numerical analysis model used in this analysis. The apparatus model 200 shown in FIG. 8 models the chamber which comprises the airflow control apparatus 2 (refer FIG. 1 etc.) provided with the blow-out nozzle 22, The longitudinal cross section parallel to the film conveyance direction FR. indicates In order to save computational resources in analyzing the internal space of the airflow control device 2, it is assumed that the device model 200 and the external space 61 are vertically symmetrical through the film 100, and the lower half Only numerical analysis was performed. In addition, in order to evaluate the blocking performance of MD types, it is sufficient to investigate the flow method of the air in the longitudinal section parallel to the film conveyance direction (FR). Therefore, numerical analysis was performed with a two-dimensional model in this plane.

The dimensions of each structure were as follows. The apparatus model 200 made the length X of the film conveyance direction FR 1000 mm and the height H 500 mm, and provided the ejection nozzle 22 and the exhaust mechanism E2 inside. The dimension W3 of the film conveyance direction FR of the extraction nozzle 22 was 200 mm, and the distance L of the film 100 and the extraction nozzle 22 was 150 mm. It was set as the setting in which the external space 61 is arrange|positioned at the upstream of the film conveyance direction of the apparatus model 200, and the connection part 4 with the tenter oven 3 is arrange|positioned at the downstream in the film conveyance direction. The distance Y1 from the lower end of the external space 61 to the film 100 was 50 mm, and the distance Y2 from the lower end of the connection part 4 to the film 100 was 50 mm.

Let the outer boundary 62 of the outer space 61 and the inner boundary 63 of the connecting portion 4 be the pressure boundary, atmospheric pressure (0.1 MPa) at the outer boundary 62 and the inner boundary 63 as boundary conditions -5Pa was set. In addition, the temperature of the external space 61 was set to 25° C. and the temperature of the tenter oven leading to the connection part 4 was set to 125° C., and the physical properties of air assumed dry air at atmospheric pressure. Boundary conditions were set in which the air volume at which the wind pressure became 60 Pa flows into the blowout nozzle 22 at the stagnation point described above, and the blowout temperature was set to 60°C. In the exhaust portions E21 and E22, boundary conditions were set in which the air volume equal to the air volume blown out from the blowing nozzle flows out.

The effect of the airflow control device 2 is evaluated between the average temperature in the evaluation surface 64 between the device model 200 and the external space 61 shown in FIG. 8 and between the device model 200 and the connection part 4 . The average temperature of the surface 65 was used as an index, respectively.

In addition, when supply and exhaust of the device model 200 is stopped under this condition, air flows from the external space 61 through the device model 200 to the connection part 4 at an average flow rate of 2.0 m/s, and the tenter oven 3 ), 25 °C cold air was introduced, resulting in temperature non-uniformity.

(Example 14)

The blowing nozzle 22 used in Example 1 was arrange|positioned to the blowing nozzle 22 of the apparatus model 200, and it analyzed. The ejection nozzle 22 had a distance t of 12 mm and an angle θ1 of 70 deg. As a result of the analysis, the average temperature on the evaluation surface 64 was 25°C, and the average temperature on the evaluation surface 65 was 125°C. That is, it was possible to prevent the leakage of hot air from the device model 200 to the external space 61 or the inflow of cold air from the connection part 4 into the tenter oven 3 . Therefore, it was estimated that generation|occurrence|production of the temperature nonuniformity in the tenter oven 3 could be suppressed by the airflow control apparatus 2 .

(Example 15)

The blowing nozzle 22C used in Example 8 was arrange|positioned to the blowing nozzle 22 of the apparatus model 200, and it analyzed. The ejection nozzle 22 had a distance t1 to t3 of 8 mm, an angle θ1 of 45 deg, and an angle θ2 of 45 deg. As a result of the analysis, the average temperature on the evaluation surface 64 was 25°C, and the average temperature on the evaluation surface 65 was 125°C. That is, it was possible to prevent the leakage of hot air from the device model 200 to the external space 61 or the inflow of cold air from the connection part 4 into the tenter oven 3 . Therefore, it was estimated that generation|occurrence|production of the temperature nonuniformity in the tenter oven 3 could be suppressed by the airflow control apparatus 2 .

Although the ejection nozzle of this invention can be preferably applied to the heating and extending|stretching process in the tenter oven of a film manufacturing facility, an application range is not limited to this.

1: Film production device 2: Airflow control device
3: tenter oven 4: connection
21: first blowing nozzle (blowing nozzle)
22, 22A, 22B, 22C: second blow-out nozzle (blowing nozzle)
51, 52: rail cover 61: outer space
62: outer boundary 63: inner boundary
64: evaluation surface of the external space side 65: evaluation surface of the connection part side
100: film 221: equalization chamber
222: ejection part 223, 224, 225, 226: classification part
223a, 224a, 225c: donation
223b, 224b, 225d, 226a: internal parts
223c, 223d, 224c, 224d, 225e, 225f, 226g, 226h, 226i, 226j: slope
224e: flat part 225a: internal classification part
225b: external classification part 225g: connection part
226b: protrusion 226c: first inner portion
226d: second inner portion 226e: first protrusion
226f: second projection B1, B2: blower
D11, D12, D13, D21, D22, D23: Duct E1, E2: Exhaust mechanism
E11, E12, E21, E22: exhaust H1, H2: heat exchanger
S: virtual plane

Claims (4)

A blowing nozzle that blows air out of a film to be conveyed, comprising:
It is formed in the interior of the blowing nozzle near the air blowing position, is an opening surface of the opening of the blowing nozzle, is inclined with respect to an imaginary surface passing through the air blowing opening surface, and is on the imaginary surface A blowout nozzle comprising an inner portion having an inclined surface inclined in a manner adjacent to each other. The method of claim 1,
and a protrusion which protrudes from the inner portion to the outside of the opening and has an inclined surface inclined with respect to the virtual surface. The method of claim 1,
The opening consists of first to third openings independent of each other,
The inner part,
a first inner portion formed between the first opening and the second opening and having an inclined surface inclined with respect to the virtual surface;
A blowout nozzle having a second inner portion formed between the second opening and the third opening and having an inclined surface inclined with respect to the virtual surface. 4. The method of claim 3,
Further comprising a protrusion that protrudes from the inner portion to the outside of the opening and has an inclined surface inclined with respect to the virtual surface,
The protrusion is
a first protrusion formed between the first opening and the second opening and having an inclined surface inclined with respect to the virtual surface;
A blowout nozzle having a second protrusion formed between the second opening and the third opening and having an inclined surface inclined with respect to the virtual surface.

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