JP2013116600A - Nozzle for cooling and manufacturing apparatus of sheet using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control deterioration of a work environment by decreasing or silencing of whistling noise of a nozzle for cooling, and doing away with decrease of cooling efficiency.SOLUTION: A nozzle body 4c for cooling in which an exhaust nozzle 4d that has a line slit of the minimum interval dimension to jet cooling gas to the external is formed, is made to have a structure in which a guide passage 4g that guides the cooling gas led into the inside toward the exhaust nozzle 4d is connected.

Description

  The present invention relates to a cooling nozzle that ejects a cooling gas toward the outside in order to cool a substance having heat, and a sheet body manufacturing apparatus including the cooling nozzle.

  As an apparatus provided with the nozzle which ejects gas, there exists a thing as shown in following patent document 1 and patent document 2. FIG.

  The thing of patent document 1 is a ventilation nozzle used for the drying apparatus of a film, Comprising: The gas for drying is led in the chamber 12, and the gas for drying is supplied from the nozzle 10 (jet port) formed in the chamber 12 It is to be ejected.

  The one described in Patent Document 2 is a blower nozzle for draining a car wash machine, which introduces a draining gas into the chamber 5 and ejects the draining gas from a nozzle 5a (spout port) formed in the chamber 5. Is.

JP-A-6-27629 JP 2008-80307 A

  However, if the nozzle disclosed in the above-mentioned patent document is used as a cooling nozzle, whistling noise is generated by the flow of gas ejected from the ejection port, and the working environment is deteriorated as noise. The noise must be reduced.

  Further, in the case where the structure for reducing the whistling noise or the silencing is provided at the nozzle outlet of the cooling nozzle, if the silencer structure is provided outside the nozzle, the distance between the cooling object and the nozzle becomes longer, and the cooling gas As a result, the cooling efficiency cannot be increased. Such a decrease in cooling efficiency is an important matter that is particularly required to be solved in the case where a cooling nozzle is provided in order to cool the melt discharged in a wide range as quickly as possible.

  The present invention has been made in view of such circumstances, and a cooling nozzle that can reduce or muffle the whistling noise and does not cause a decrease in cooling efficiency and a melt discharged using the cooling nozzle. It is providing the manufacturing apparatus of the sheet | seat body to cool.

In order to solve the above problems, the present invention employs the following means.
(1) The cooling nozzle of the present invention is a cooling nozzle in which a jet port composed of a linear slit for ejecting the cooling gas toward the outside is formed. A guide passage for guiding toward the jet port is connected.
(2) The cooling nozzle according to the present invention is the cooling nozzle according to (1), wherein the guide passage is orthogonal to a direction in which the cooling gas in the guide passage is guided (hereinafter referred to as a route direction). The cross-sectional shape of is substantially the same along the path direction, and is substantially the same shape as the shape of the slit as the jet port.
(3) The cooling nozzle of the present invention is the cooling nozzle according to (2), in which the dimension corresponding to the slit spacing dimension of the jet outlet is A and the path length of the guide passage is B And B / A = 3-8.
(4) The cooling nozzle of the present invention is the cooling nozzle according to any one of (1) to (3), wherein a flange portion that guides the cooling gas is formed at the entrance of the guide passage. It is characterized by being.
(5) The sheet body manufacturing apparatus of the present invention includes a base for discharging the melt broadly, a cooling roll for rapidly cooling the melt discharged from the base and solidifying the sheet body, and a circumferential direction of the cooling roll. The cooling nozzle according to any one of (1) to (4) above, wherein the cooling nozzle is provided along with a cooling nozzle that blows a cooling gas toward the sheet body. The linear slit which is a jet nozzle is arrange | positioned along the width direction of the solidified sheet | seat body, It is characterized by the above-mentioned.

According to the cooling nozzle of the present invention or the sheet body manufacturing apparatus using the same, the following effects can be obtained.
(1) Since the guide passage for guiding the cooling gas guided to the inside of the cooling nozzle toward the jet outlet is connected to the jet outlet, the cooling gas is guided by the guide passage and ejected from the jet outlet. And the whistling noise is reduced or silenced. Moreover, since the guide passage is provided in the cooling nozzle and does not protrude to the outside, the jet outlet can be made as close as possible to the coolant, and the gas flow rate can be reduced when the distance is excessively large. The cooling efficiency based on this is not reduced.
(2) Since the cross-sectional shape of the guide passage perpendicular to the route direction is substantially the same along the route direction and substantially the same shape as the slit, the cooling gas is It is possible to smoothly circulate through the guide passage, reduce the occurrence of turbulence in the gas flow, and exhibit a high whistling noise reduction or silencing effect.
(3) When the dimension corresponding to the interval between the slits of the jet port is A and the path length of the guide passage is B, B / A = 3 to 8, so that a high whistling sound A reduction or silencing effect can be exhibited. The reason why this value is optimal is not clear, but the inventors have intensively studied to obtain this conclusion. Presumably, it is considered that the vortex created by the cooling gas entering the guide passage is influenced by whether or not it is near the jet port of the cooling gas.

When B / A is 3 (Example 1), there is a whistling sound depending on the speed of the cooling gas, but when B / A is 6 (Example 2), it depends on the gas speed. There is no whistling sound. This is because when the B / A is around 6, the influence of the gas vortex caused by the gas velocity is far from the spout, so it is not heard as a sound. It is thought that the effect of the vortex generated on the outside is heard outside as a sound. The reason why the whistling sound disappears when the flow velocity exceeds 25 m / s is considered to be because the velocity of the gas was high and no vortex was created.
(4) In the case where the flange portion for guiding the cooling gas is formed at the entrance of the guide passage, a rectifying effect by the flange portion can be expected, and the whistling noise reduction or the silencing effect can be further enhanced. .
(5) In the sheet body manufacturing apparatus including the cooling nozzle that is disposed along the circumferential direction of the cooling roll and blows a cooling gas toward the sheet body solidified by the cooling roll, the above (1) to (1) to (5). (4) The cooling nozzle according to any one of (4) is arranged along the width direction of the sheet body in which the linear slit that is the ejection port is solidified, so that whistling noise can be reduced or silenced This can be achieved as much as possible, and it is possible to prevent the working environment and working environment at the production site of the sheet body from deteriorating.

It is a figure which shows the whole structure of the manufacturing apparatus of the sheet | seat body in which the nozzle for cooling which concerns on one Embodiment of this invention was used. It is a figure which shows the expansion of the nozzle for cooling used for the manufacturing apparatus of the sheet | seat body of FIG. It is a figure which shows the structure of the nozzle for cooling concerning one Embodiment of this invention. The shape of the nozzle for cooling of Example 1 is shown. The shape of the cooling nozzle of Example 2 is shown. The shape of the cooling nozzle of a prior art (comparative example) is shown.

  Below, the cooling nozzle which concerns on one Embodiment of this invention, and the manufacturing apparatus of a sheet | seat body using the same are demonstrated.

  In FIG. 1, the manufacturing apparatus of the sheet | seat body using the nozzle for cooling which concerns on this Embodiment is shown.

  That is, the thermoplastic resin is melted by the extruder 1, and the molten thermoplastic resin is guided from the conduit 2 to the base 3, discharged from the wide slit 3 a provided at the tip of the base 3, and by the chill roll 4 (cooling roll). It is quenched and solidified into a sheet body. A plurality of cooling nozzles 4 a according to the present embodiment are arranged along the circumferential direction of the chill roll 4, and a cooling gas (in this case, air) is blown toward the sheet body discharged from the base 3 and solidified.

  And the sheet body S as a product is shape | molded by passing the solidified sheet body through the longitudinal stretch apparatus 5 and the horizontal stretch apparatus 6. FIG. The sheet S as a product is passed through the sheet thickness measuring means 7 and the thickness in the width direction (lateral direction) of the sheet is measured, and then wound into a roll. The measurement result by the sheet thickness measuring means 7 is sent to the control device 8, and the slit interval of the base 3 is controlled so that the thickness of the sheet S is in a desired range.

  FIG. 2 shows a detailed view of the vicinity of the chill roll 4. That is, the chill roll 4 is rotatably supported by a bearing (not shown) and can be driven to rotate by a driving device (not shown). A frame F that holds the cooling nozzle 4a is provided on the left side of the chill roll 4 in the figure. The frame F has a plurality of flat shapes extending in the axial direction of the chill roll 4 (10 pieces in the figure). ) Cooling nozzles 4a are arranged along the circumferential direction of the chill roll 4 and are fixed by fastening means (not shown) such as bolts. A supply passage (not shown) for supplying air, which is a cooling gas, is arranged inside the frame F, and this supply passage is connected to the cooling nozzle 4a, and cooling air is placed in the cooling nozzle 4a. Is guided.

  FIG. 3 shows a cross-sectional view of the main part of one cooling nozzle 4a. The cooling nozzle 4a has a bottomed flat cylindrical nozzle body 4c through which a cooling gas is guided, and a nozzle body having a linear slit having a minimal interval opening in the nozzle body 4c along the flat direction. 4d which ejects the cooling gas guided in 4c outside.

  A guide passage 4g that guides the cooling gas introduced into the nozzle body 4c toward the nozzle 4d within the nozzle body 4c is preferably integrally connected to the inner edge of the nozzle 4d. Moreover, it is preferable that the cross-sectional shape orthogonal to the route direction of the guide passage 4g is substantially the same along the route direction and substantially the same as the shape of the slit of the jet outlet 4d. Furthermore, it is preferable that a flange portion 4f for giving rigidity to the guide passage 4 is integrally formed at the entrance of the guide passage 4g. The flange portion 4f also has a function of rectifying and guiding the cooling gas into the guide passage 4g. In addition, you may not provide the flange part 4f.

  The sheet body manufacturing apparatus of the present invention includes a base for discharging the melt broadly, a cooling roll for rapidly cooling the melt discharged from the base and solidifying the sheet body, and a circumferential direction of the cooling roll. In the sheet body manufacturing apparatus including the cooling nozzle that blows the cooling gas toward the sheet body, the cooling nozzle of the present invention described above is solidified with a linear slit that is an ejection port thereof. It is characterized by being arranged along the width direction of the sheet body. In the sheet body manufacturing apparatus, only one cooling nozzle or a plurality of cooling nozzles may be provided. Further, the number of the cooling nozzles of the present invention in the cooling nozzle is not particularly limited, and all the cooling nozzles may be used as the cooling nozzles of the present invention, or only a part of the cooling nozzles of the present invention. The cooling nozzle may be used, or any of them may be used.

  In order to verify the reduction of the whistling noise or the silencing effect of the cooling nozzle 4a of the present invention, the cooling nozzles 4c and 14c having the shapes as shown in FIGS. 4 to 6 (a) to (c) are manufactured. The sheet was attached to the sheet body manufacturing apparatus shown in FIG. 1 or FIG. 2, and a whistling sound was observed by blowing a cooling gas onto the melt.

  A cooling nozzle 4a shown in FIG. 4 (a) has a guide passage 4g connected to a jet outlet 4d as a first embodiment, and has a dimension A in the figure (in the cross-sectional shape of the guide passage orthogonal to the path direction). The dimension corresponding to the gap (interval along the roll circumferential direction) of the slit of the jet outlet 4d is 2 mm, and the dimension B is the path length of the guide path (path length from the entrance of the guide path 4g to the base end). (That is, the path length from the entrance of the guide passage 4g to the jet outlet). The same applies hereinafter) is 6 mm. The cooling nozzle 4a shown in FIG. 5 (b) has a guide passage 4g connected to a jet outlet 4d as a second embodiment, and has an A dimension of 2 mm and a B dimension of 12 mm. As a comparative example, the cooling nozzle 14a shown in FIG. 6 (c) is equivalent to a C dimension (spacing dimension along the roll circumferential direction of the slit that is the jet outlet 14d), unlike the first and second examples. The C dimension (the gap dimension of the slit that is the jet outlet 4d) is 2 mm, only the jet outlet 14d is formed, and no guide passage is provided.

  Table 1 shows the observation results of the observer with respect to the level of whistling noise when the cooling nozzles 4a and 14a of the above-described Example 1, Example 2, and Comparative Example are used. Judgment is ○ (good) when an unpleasant whistling sound is not observed or the sound pressure level is very low, △ (possible) when an unpleasant whistling sound is observed a little, an unpleasant loud whistling sound When observed, it was set as x (defect).

  According to Table 1, in the comparative example, it was determined that the flow rate of the cooling gas was not allowed except in the case of 10 m / s and 15 m / s. In Example 1, it was determined to be acceptable at 10 m / s, 15 m / s, 20 m / s, and 25 m / s, and was determined to be good at 30 m / s and 35 m / s. In Example 2, it was determined that any of 10 m / s to 35 m / s was good.

  In the comparative example, it is considered that the whistling sound was generated because the turbulence or the like was disturbed in the gas flow ejected from the ejection port 14d. In Example 1 and Example 2, since the guide passage 4g is provided, it is considered that the cooling gas is rectified and disturbances such as vortices are reduced. In the second embodiment, the length B of the guide passage 4g is longer than that in the first embodiment, so that it is estimated that a more effective rectifying effect is obtained.

3 Cap 3a Slit 4 Chill roll (cooling roll)
4a Cooling nozzle 4c Nozzle body 4d Spout 4f Flange 4g Guide passage A Dimension B corresponding to the gap dimension in the roll circumferential direction of the slit which is the spout 4d in the cross-sectional shape orthogonal to the passage direction of the guide passage 4g Path length C from 4g jet nozzle to base end C

Claims (5)

In the cooling nozzle formed with a jet port composed of a linear slit for jetting the cooling gas toward the outside,
A cooling nozzle, characterized in that a guide passage for guiding the cooling gas guided to the inside of the nozzle toward the ejection port is connected to the ejection port.   The cross-sectional shape of the guide passage perpendicular to the direction in which the cooling gas is guided in the guide passage (hereinafter referred to as the path direction) is substantially the same along the path direction, and the shape of the slit 2. The cooling nozzle according to claim 1, wherein the nozzles have substantially the same shape.   3. The cooling according to claim 2, wherein B / A = 3 to 8 when a dimension corresponding to the interval between the slits of the ejection port is A and a path length of the guide passage is B. 4. Nozzle.   The cooling nozzle according to any one of claims 1 to 3, wherein a flange portion for guiding a cooling gas is formed at an entrance of the guide passage. A base that discharges the melt broadly, a cooling roll that rapidly cools the melt discharged from the base and solidifies it into a sheet body, and is arranged along the circumferential direction of the cooling roll, for cooling toward the sheet body In a sheet body manufacturing apparatus comprising a cooling nozzle that blows gas,
A cooling nozzle according to any one of claims 1 to 4, wherein the linear slit that is the jet outlet is disposed along the width direction of the solidified sheet body. manufacturing device.

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