KR20220063114A - A scraper device, a rotating device having an object removal function, a method for removing an object to be removed, a method for manufacturing a film, and a method for manufacturing a microporous membrane - Google Patents

Abstract

The scraper device includes a turning shaft portion 22 extending parallel to the rotation axis of the cylindrical body, first scrapers 31A and second scrapers 31B extending in the longitudinal direction of the pivot shaft portion, and turning around the pivot shaft portion. A first holding part 33 having a base end that is possibly attached to the pivoting shaft and an arm extending from the base to hold the first scraper, and the first holding part are provided separately to the pivoting shaft so as to be able to pivot around the pivoting shaft. and a second holding portion 33 having a base end to which it is attached and an arm portion extending from the base end to hold the second scraper.

Description

A scraper device, a rotating device having an object removal function, a method for removing an object to be removed, a method for manufacturing a film, and a method for manufacturing a microporous membrane

The present invention relates to a scraper device used for removing deposits or excess material adhering to the outer circumferential surface of a cylindrical body, and a rotating device having a function to remove an object to be removed such as attached material or excess material, and a method for removing an object to be removed from the outer circumferential surface of the cylindrical body And, it relates to a method for producing a film using the method and a method for producing a microporous membrane.

In order to remove an object to be removed, such as deposits and surpluses, from the outer circumferential surface of a cylindrical body such as various rolls, a technique of scraping by contacting a scraper or a doctor blade with the outer circumferential surface of the cylindrical body during rotation is widely used. For example, when manufacturing a microporous membrane such as a microporous polyolefin resin sheet, a diluent (plasticizer) such as liquid paraffin is added to the raw material resin and kneaded to obtain a resin solution, and the resin solution is extruded from a nozzle into a sheet shape. Thus, it is cooled and solidified with a cast cooling device. The cast cooling device is provided with a rotating cooling roll (chill roll), and a resin solution is continuously discharged to the outer peripheral surface (ie, cast surface) of this cooling roll to be cooled and solidified, and after stretching treatment, etc., it is wound up as a film. It is wound on a roll. In order to obtain a high-quality microporous membrane, it is necessary to remove the deposits and surpluses remaining and adhering to the outer peripheral surface of the cooling roll, and for this reason, a doctor blade or a scraper is used. Patent document 1 is disclosing an example of the manufacturing method of a microporous polyolefin resin sheet. In addition to the production of the microporous membrane, for example, in a flexographic printing machine, a doctor blade is used to remove excess ink adhering to the anilox roll in contact with the printing plate.

As shown in FIG. 6 , when removing attachments or excess material from the outer circumferential surface of the cylindrical body using a scraper or doctor blade 46, the scraper or doctor blade 46 comes into contact with the cylindrical body as it is rubbed, so it is worn. For this reason, for example, it is necessary to replace the scraper and the doctor blade 46 at regular intervals. However, during this replacement, the rotation of the cylindrical body must be stopped for a long time, resulting in a decrease in production efficiency, etc. goes on Therefore, in Patent Document 2, as a doctor blade support device for supporting a doctor blade for removing excess ink from the anilox roll, a holding member rotatably supported is disposed parallel to the anilox roll, and a pair of doctors Removably attaching a blade to a holding member is disclosed. The pair of doctor blades are attached so that one of them is in a contact position in contact with the anilox roll and the other is in an exchange position away from the anilox roll. In this doctor blade support device, when replacing the doctor blade, the holding member is removed from the anilox roll after the rotation of the anilox roll is stopped, the holding member is rotated between the contact position and the exchange position, and then the holding member Resume rotation of the anilox roll by bringing it closer to the anilox roll again. The replacement of the doctor blade itself is performed against the doctor blade in the retracted position during rotation of the anilox roll. Thereby, the time for stopping rotation of the anilox roll can be shortened, and production efficiency can be improved.

In the following description, a member that comes into contact with the outer circumferential surface of the cylindrical body in order to scrape off deposits and surpluses on the outer circumferential surface of the cylindrical body is collectively referred to as a blade.

International Publication No. 2015/083591 Japanese Patent Laid-Open No. 2006-44193

According to the doctor blade support device shown in Patent Document 2, the other blade can be exchanged while one of the two blades attached to the holding member is removing the deposit from the outer peripheral surface of the cylindrical body. The time to stop rotation can be shortened. However, in this doctor blade support device, when the two blades are replaced with each other between the contact position and the exchange position by rotation of the holding member, it is necessary to stop the rotation of the cylindrical body, and the continuous operation of the cylindrical body is further restricted. there is. It is also conceivable to replace the two blades with each other between the contact position and the exchange position without stopping the rotation of the cylindrical body. Since this is not removed, there is a possibility that a problem may occur in the quality of the product.

It is an object of the present invention to provide a scraper device capable of replacing a blade without stopping rotation of a cylindrical body, a rotating device having a removal object removal function, and a removal object removal method. Another object of the present invention is to provide a method for manufacturing a microporous membrane using the removal method of the present invention.

The present invention is a scraper device for removing an object to be removed adhering to an outer peripheral surface of a cylindrical body rotatable around a rotating shaft, comprising a holding mechanism for movably holding a plurality of scrapers including at least first and second scrapers, The holding mechanism holds the first scraper at a processing position for removing the object to be removed adhering to the cylindrical body, and the second scraper comes into contact with the first scraper and moves to a position where the object to be removed can be removed. It is a scraper device which separates the said 1st scraper from the said processing position when it does.

In addition, as a scraper device for removing an object to be removed attached to the outer peripheral surface of a cylindrical body rotatable around a rotation shaft, a swing shaft portion extending parallel to the rotation shaft, and extending along the axial direction of the swing shaft portion, and the swing A first scraper attached to the pivot shaft so as to be able to turn around the shaft, and a second scraper that extends along the axial direction of the pivot shaft and is attached to the pivot shaft so as to be able to turn around the pivot shaft. It is a scraper device.

The present invention includes the scraper device and the cylindrical body, and each one of the first scraper and the second scraper removes the deposits and surpluses from the outer peripheral surface of the cylindrical body to the cylindrical body. It is a rotating device having a function to remove the object to be removed, characterized in that provided.

The present invention is a method for removing deposits and excess substances from the surface of a cylindrical body using the removal object removal apparatus of the present invention.

The present invention is a process of extruding a resin from a nozzle to form a resin sheet, bringing the resin sheet into contact with the outer peripheral surface of the cylindrical body to solidify the resin sheet by cooling, and using a rotating device having a function of removing the deposits and surpluses. It is a manufacturing method of the film which has the process of removing a removal object from the surface of the said cylindrical body.

The resin is a resin solution containing a polyolefin resin and a diluent, and the present invention is a method for producing a microporous membrane comprising the above-described method for producing the film and a step for obtaining a microporous membrane by removing the diluent from the cooled and solidified resin sheet. .

In the present invention, the first scraper and the second scraper can move while changing the distance between them. Therefore, by controlling the positions of these scrapers, the position at which the scrapers on the outer circumferential surface of the cylindrical body contact is not substantially changed, and further without intervening the time during which any of the scrapers does not contact the cylindrical body, the cylinder It is possible to instantaneously switch from the state in which one scraper is in contact with the outer peripheral surface of the shaped body to the state in which the other scraper is in contact. Therefore, the removal of the deposit|attachment and excess material in the outer peripheral surface of the said cylindrical body can be continued, without stopping rotation of the cylindrical body. That is, in manufacture of a film, it becomes possible to manufacture the film of stable quality, without stopping a manufacturing process.

You may have a some scraper as long as the said structure is a state which is established.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the structure of the removal object removal apparatus which concerns on embodiment of this invention, each holding|maintenance part around a turning shaft part, and turning of each scraper.
It is a longitudinal sectional view when one scraper is in a stand-by position.
Fig. 3 is a schematic side view showing another example (1) of the scraper device.
4 is a view showing another example (2) of the scraper device.
Fig. 5 is a diagram showing another example (3) of the scraper device.
6 is a prior art scraper device.

EMBODIMENT OF THE INVENTION Next, embodiment of this invention is described with reference to drawings. Fig. 1 shows a rotary device 20 having an object removal function according to an embodiment of the present invention. This rotating device 20 is one embodiment of the holding mechanism which has a removal object removal function which removes a deposit|attachment and an excess material, and holds the scraper mentioned later movably. In the state (A) of the states (A) to (D) representing a series of operation conditions described below, the rotating device 20 is a cylinder positioned on the left side of the rotating device 20 and capable of rotating around the rotating shaft. It is used in order to remove the deposit|attachment and excess material adhering to the outer peripheral surface of the shaped body 10 (Hereinafter, these deposits and excess material are collectively referred to as a "removal object").

The rotary device 20 having a removal object removal function includes a turning shaft portion 22 extending parallel to the rotation axis of the cylindrical body, and two scrapers extending along the longitudinal direction (axial direction) of the pivot shaft portion 22, respectively ( 31A, 31B) are provided. The both ends of the turning shaft part 22 are being fixed to the end plate 21 via the shaft fixing part 23, respectively. These end plates 21, as shown by the broken line in the figure, attach this rotating device 20 to each upright post 11, and in order to fix each member which comprises this rotating device 20, installed. The scraper 31A constitutes the first scraper, and the scraper 31B constitutes the second scraper. Moreover, the scraper apparatus is comprised by these scrapers 31A, 31B and the turning shaft part 22. As shown in FIG.

The scrapers 31A and 31B are of the same shape as each other, and are each detachably provided with blades 32A and 32B which are members that actually come into contact with the outer circumferential surface of the cylindrical body. That is, for example, the scrapers 31A and 31B have a main body portion serving as a clamp structure, and while the blades 32A and 32B are fitted by the main body portion, respectively, the blades 32A and 32B are inserted in the main body portion by a bolt or the like not shown in the figure. Fix the inserted state. Thereby, the scrapers 31A, 31B are comprised so that the blades 32A, 32B may be hold|maintained on the front-end|tip side (cylindrical body side). The blades 32A and 32B are elongated plate-shaped members each extending in the direction of the rotational axis of the cylindrical body, that is, in the longitudinal direction of the turning shaft portion 22, for example, an elastic body such as plastic or rubber, in this example PET (polyethylene). terephthalate) blades. These blades 32A, 32B are attached to the scrapers 31A and 31B, respectively, so as to lie down toward the downstream side in the rotational direction of the cylindrical body 10, that is, to have a reverse angle, as shown in the state (A) of Fig. 1 . has been Therefore, the surface facing the turning shaft part 22 among both surfaces in the longitudinal direction of the blades 32A, 32B serves as a surface for scraping the object to be removed on the surface of the columnar body 10 .

Although the scrapers 31A and 31B cannot overtake each other in the rotating apparatus 20 with a removal object removal function of this embodiment, it is able to turn around the rotation shaft part 22 independently, respectively. In addition, the scrapers 31A, 31B are substantially the same length in the longitudinal direction of the turning shaft part 22, and are comprised so that they may overlap each other when they come into contact with each other along the rotation around the turning shaft part 22. As shown in FIG. The turning radius of the scrapers 31A and 31B is, that is, the radius of the outer periphery of the area through which the scraper passes by turning around the turning shaft 22, except for the part due to the difference in wear of the blades 32A and 32B. , are identical to each other.

In order to enable these scrapers 31A and 31B to pivot independently of each other, the scraper 31A is held by a holding portion 33 attached to the pivot shaft 22 so as to be pivotable around the pivot shaft 22 . has been Specifically, the holding part 33 has a base end attached to the pivot shaft 22 rotatably around the pivot shaft 22 and an arm extending from the base end to hold the scraper 31A, and the pivot shaft portion ( 22) are arranged to be spaced apart from each other along the longitudinal direction. The holding part 33 is provided in multiple places along the longitudinal direction of the turning shaft part 22. As shown in FIG. Since the holding parts 33 are mechanically connected to each other via the scraper 31A, the periphery of the turning shaft 22 is rotated together with the scraper 31A, and when one of the holding parts 33 is rotated, the holding The rest of the portion 33 and the scraper 31A also rotate at the same time. Similarly, the scraper 31B has a holding portion 33 each having a base end attached to the pivot shaft 22 so as to be pivotable around the pivot shaft 22 and an arm portion extending from the base end to hold the scraper 31B. ), and the holding part 33 is mechanically connected to each other through a scraper 31B.

As for the holding part 33, one or more things for the scraper 31A and the thing for the scraper 31B are repeatedly arrange|positioned alternately. That is, the holding part which holds the scraper 31A and the holding part which hold|maintains the scraper 31B are arrange|positioned alternately along the longitudinal direction of the turning shaft part 22. As shown in FIG. Although the total number of the holding parts holding the scraper 31A may be one, it is preferable that it is plural, and although the total number of the holding parts which hold|maintains the scraper 31B may be one similarly, it is preferable that it is plural. In addition, although the holding part 33 can turn in the same direction as the rotational direction of the cylindrical body, it is preferable not to turn in the direction opposite to the rotational direction of the cylindrical body. In order to prevent rotation in the reverse direction, It is preferable that, for example, a one-way bearing is provided inside the portion 33 .

As the turning shaft part 22, it is preferable to use the member which is tubular and in which the gas flow area|region is formed. In the case of using such a member, at least one end of the turning shaft portion 22 is used as a supply hole (not shown) for supplying a gas such as air to the inside of the gas distribution region, and the side surface of the turning shaft portion 22 An ejection hole 28 (refer to Fig. 2) for ejecting gas is formed outside the turning shaft 22 from the gas flow region. The supply hole communicates with the tubular gas introduction part 24 provided in the shaft fixing part 23 . By supplying gas from the outside through the gas introduction part 24, gas is ejected from the ejection hole 28 through the gas distribution region. In this example, the ejection hole 28 is formed in the central part in the longitudinal direction of the turning shaft part 22. As shown in FIG.

Among the configurations described above, the pivoting shaft portion 22, the two scrapers 31A, 31B, and the holding portion 33 constitute a scraper device, which is a basic element constituting the rotary device 20 having an object removal function to be removed. .

In the rotary device 20 of the present embodiment, the scrapers 31A and 31B are independent, that is, by changing the distance between them, they can rotate around the turning shaft 22, so using this, the cylindrical body ( As described below, without substantially changing the position at which the scraper contacts on the outer peripheral surface of 10), the other scrapers 31A and 31B are in contact with the outer peripheral surface of the cylindrical body 10 from the state in which they are in contact. It is possible to instantaneously switch to the state in which the scrapers 31B and 31A are in contact. When switching the scrapers 31A and 31B which contact the outer peripheral surface of the cylindrical body 10, it is not necessary to stop rotation of the cylindrical body 10. As shown in FIG. Thereby, according to the rotation device 20, the blades 32A and 32B can be exchanged without stopping the rotation of the cylindrical body 10 and without adversely affecting the quality of the product or the like.

1 is a diagram schematically illustrating removal of an object to be removed from the outer peripheral surface of a cylindrical body 10 by a rotating device 20 having a removal function to remove, and shows the movement of each scraper 31A, 31B there is. According to the turning angle around the turning shaft part 22, for each of the scrapers 31A and 31B, five positions are defined: a processing position, a stop position, an exchange position, a standby position, and a contact position. The cylindrical body 10 shall rotate counterclockwise, as shown by an illustration arrow.

State (A) of FIG. 1 has shown the state in which the scraper 31A is in a processing position, and the scraper 31B is in a contact position. The processing position is a position where one of the two scrapers 31A and 31B contacts the outer peripheral surface of the cylindrical body 10 to remove the object to be removed. The contact position is a position through which the scrapers 31A and 31B pass according to the turning of the scrapers 31A and 31B. When switching from one scraper 31A, 31B to another scraper 31B, 31A when one scraper 31A, 31B is in the processing position, by turning the other scraper 31B, 31A It is performed by superimposing on one scraper 31A and 31B, and also turning another scraper 31B and 31A to a processing position. For switching, the position of the other scraper 31B and 31A when contacting the upper surface of one scraper 31A and 31B in a processing position is made into the above-mentioned contact position.

In the state (A) of Fig. 1, in the contact position, the tip of the scraper 31B (the tip of the blade 32B) is at a position slightly away from the outer peripheral surface of the cylindrical body 10, but the operator uses the scraper 31B, Further, by manually turning toward the lower scraper 31A, the scraper 31B starts to move toward the processing position. The scraper 31A, which was previously in the processing position, is extruded downward from the processing position by the scraper 31B by turning the scraper 31B to the processing position. When shown in the state (A) of Fig. 1, when the scraper 31B is rotated from the standby position to the processing position, the blades 32A and 32B are constituted by an elastic body, so that both (more Precisely, both of the blades 32A and 32B) contact the outer peripheral surface of the cylindrical body 10 at one time and at the same time. Then, the outer peripheral surface of the cylindrical body 10 between these blades 32A and 32B advances toward the upper blade 32B thereafter, and the object to be removed adhering to the outer peripheral surface is scraped by the blade 32B. is pinged Thereby, in the outer peripheral surface of the cylindrical body 10, it is preventing that the area|region which is not scraped by the scrapers 31A, 31B is formed. In addition, it is one order that both scrapers 31A, 31B simultaneously contact the outer peripheral surface of the cylindrical body 10, The scraping position by the scrapers 31A, 31B in the outer peripheral surface of the cylindrical body 10. is practically unchanged. For example, when removing the object to be removed from the outer peripheral surface of a cooling roll that cools the resin sheet, if the scraping position is changed, cooling by the cooling roll may be affected, and the physical properties of the resin sheet used as a product may change. , According to the rotary device 20 having a removal object removal function of the present embodiment, such an influence on a product can be excluded.

The scraper 31A extruded from the processing position turns by gravity to the position below the figure, and stops at a stop position. In the state (B) of FIG. 1 , the scraper 31A is in the stop position, and the scraper 31B is in the processing position. As described with reference to Fig. 2, when the scraper 31B is positioned at the processing position, gas such as air is ejected from the turning shaft 22 with respect to the scraping surface of the object to be removed in the scraper 31B. , the stop position is set to a position where the scraper 31A does not interfere with the ejection of gas. Although it is also possible to replace|exchange the scraper 31A in a stop position, since the distance with the other scraper 31B in a processing position is close, the workability|operativity of an exchange operation|work is bad. Then, let the position used as the substantially opposite side seen from a processing position across the turning shaft part 22 be an exchange position which replaces the scraper 31B. With respect to the scraper 31B in the exchange position, the blade 32B can be exchanged or the like. In the state (C) of Fig. 1, the scraper 31A is in the replacement position, and the scraper 31B is still in the processing position. When the replacement operation for the scraper 31A is finished, the scraper 31A is turned to the standby position. The standby position is a position in front of the contact position and is a position spaced upward from the contact position. In the state (D) of FIG. 1 , the scraper 31A is in the standby position, and the scraper 31B is still in the processing position. When the scraper 31A is turned from this state, the scraper 31A comes into contact with the scraper 31B in the processing position, and then moves to the processing position. In other words, it returns to the state A from the state D in Fig. 1, but in that case, the scraper 31A and the scraper 31B are replaced with the previous state A (this is the state A ')) In addition, in the state (B) of FIG. 1 to the state (D), the drawing of the cylindrical body 10 is abbreviate|omitted.

As described above, in the rotary device 20 having a removal object removal function of the present embodiment, one of the scrapers 31A and 31B removes the scrapers 31A and 31B to the cylindrical body 10 and removes it on the outer peripheral surface. While the object is being removed, the other scrapers 31B and 31A can be replaced at the same time.

Here, in the example shown, the blades 32A, 32B of the scrapers 31A, 31B contact the outer peripheral surface of the cylindrical body 10 in a reverse angle form with respect to the rotation direction of the cylindrical body 10 . That is, the scrapers 31A and 31B are inclined to approach the outer peripheral surface of the cylindrical body 10 as they go upstream in the rotational direction of the cylindrical body 10 when in contact with the outer circumferential surface of the cylindrical body 10 . take a pose By adopting the reverse angle shape, it is possible to achieve reliable scraping performance at a lower contact pressure. When the blades 32A and 32B come into contact with the outer peripheral surface of the cylindrical body 10 , the blades 32A and 32B and the blades 32A and 32B are seen from the end in the longitudinal direction of the cylindrical body 10 . The angle θ formed by the tangent to the outer circumferential surface of the cylindrical body 10 at the contact point is preferably 60° or less from the acute angle side as shown in the state (A) of FIG. 1 . Moreover, more preferably, the range of 15 degrees or more and 45 degrees or less on the acute angle side is good.

The rotation apparatus 20 which has a removal object removal function of this embodiment is demonstrated in more detail. Fig. 2 is a cross-sectional view when the scraper 31A is in the standby position and the scraper 31B is in the processing position. A hollow one, ie, a tube, is used as the turning shaft portion 22, and the inside of the tube serves as a gas flow region. On the outer peripheral surface of the turning shaft part 22, the ejection hole 28 which communicates with the gas distribution area|region and blows out the gas in the gas distribution area|region is formed. The ejection hole 28 is directed toward the contact line by which the blades 32A and 32B come into contact with the outer peripheral surface of the cylindrical body 10 when the scrapers 31A and 31B are in the processing position, indicated by a straight arrow in the figure. It is formed to eject gas as shown. The blown gas blows away the removal object scraped from the outer peripheral surface of the cylindrical body 10 by the blades 32A, 32B from the blades 32A, 32B on the spot. Thereby, a stable scraping effect is continuously obtained.

In addition, as shown in FIG. 1, the scrapers 31A and 31B consider a surface perpendicular to the longitudinal direction of the turning shaft portion 22 (that is, the rotational axis direction of the cylindrical body 10), and a cross section in which both are curved. have With respect to the scrapers 31A, 31B, the surface facing the inner side of the curve is called an inner surface, and the surface facing the outer side of the curve is called a back surface. In order to realize stable switching of the scrapers 31A and 31B in the processing position, when one of the scrapers 31A and 31B is in the contact position, the other scraper is placed on the inner surface of the scraper 31A, 31B. It is preferable that the cross-sectional shape of each scraper 31A, 31B is prescribed|regulated so that the back surface of the scraper 31B and 31A may enter. In addition, when the rear surface of the other scraper 31B, 31A enters the inner surface of one scraper 31A, 31B, the inner surface of each scraper 31A, 31B has a receiving portion 34 so as to accommodate the rear surface. ) is formed.

By the way, in the rotating apparatus 20 of this embodiment, when removing a removal object from the outer peripheral surface of the cylindrical body 10 which is rotating, the scrapers 31A and 31B in a processing position vibrate or move. It is necessary to prevent it, and it is necessary to securely fix the scrapers 31A, 31B to the processing position. It is necessary to fix the scrapers 31A, 31B also regarding the exchange position and the standby position. It is preferable that the scrapers 31A, 31B can be fixed also with respect to the stop position. On the other hand, it is also necessary for the operator to be able to turn the scrapers 31A and 31B around the pivot shaft 22 . Hereinafter, the mechanism for fixing the scrapers 31A, 31B to a predetermined position and for turning the scrapers 31A, 31B is demonstrated. A concave portion 44 is formed on the outer peripheral surface of the proximal end portion of the holding portion 33 of the stellate. In addition, a plunger 43 mechanically fixed to the shaft fixing part 23 is provided as a locking part, and the plunger 43 is in the recessed part 44 of the holding part 33 in the state in which the tip part protrudes. It is configured so as to be convexly depressed toward the holding portion 33 so as to engage. In a state in which the tip of the plunger 43 protrudes, the holding part 33 is fixed by the plunger 43 , and in a state in which the tip of the plunger 43 is retracted, the holding part 33 moves around the pivoting shaft 22 . turn is possible. In Fig. 1, the plunger 43 on the front side of the ground is shown among the plungers 43 engageable with the recessed portion 44 of the holding portion 33 connected to the scraper 31A. Similarly, in the inner side) not shown in the drawing), a holding portion 33 connected to the scraper 31B is provided, and a plunger 43 capable of engaging with the recessed portion 44 of the holding portion 33 is provided. In the holding part 33 connected to the scraper 31A, the recessed part 44 has a recessed part 44 formed on the plunger 43 when the scraper 31A is in each of the processing position, the stop position, the exchange position, and the standby position. It is provided in four places of the outer peripheral surface of the base end of the holding part 33 so as to face the front end of the. Also in the holding part 33 connected to the scraper 31B, the recessed part 44 is similarly formed in four places of the outer peripheral surface of the base end part. In order to avoid interference with the scrapers 31A, 31B while disposing the plunger 43 close to the holding portion 33, the concave portion 44 is formed on the outer peripheral surface of the proximal end of the holding portion 33 by the scrapers 31, 31B. It is preferable that it is formed on the outer side of the turning area of , that is, on the both end side of the turning shaft part 22. By configuring the tip end of the plunger 43 to engage with the concave portion 44 on the outer peripheral surface of the base end portion of the holding portion 33, the scrapers 31A and 31B can be placed in each of the processing position, the stop position, the exchange position, and the standby position. can be stopped at Then, from the state in which the tip of the plunger 43 is engaged with the concave portion 44 and the scrapers 31A and 31b are stopped, when the operator applies a force to turn the scrapers 31A and 31B, the plunger 43 is reduced so that the distal end of the shaft is reduced away from the side of the turning shaft 22, and reaches the outer peripheral surface of the proximal end of the holding portion 33 over the edge of the concave portion 44 so that the scrapers 31A and 31B can be turned. .

Although the scrapers 31A and 31B can be fixed to a predetermined position by the plunger 43 and the recessed portion 44 on the outer peripheral surface of the proximal end of the holding portion 33, the rotary device having a removal function of the present embodiment ( 20), while the worker turns the scrapers 31A, 31B, it is equipped with the mechanism for fixing the scrapers 31A, 31B to a processing position more reliably. Although one scraper 31A is connected to and supported by the holding part 33, among these, the outer peripheral surface of the base end of the holding part 33, and the outer peripheral surface of the holding part 33 located farthest from the holding part 33. In at least one of them, a depression portion 42 capable of inserting one end of the rod-shaped body 41 for turning the scraper 31A is formed. Similarly, at least one of the outer peripheral surface of the base end of the holding part 33 connected to the other scraper 31B, and the outer peripheral surface of the holding part 33 connected to the scraper 31B located farthest from the holding part 33, In this example, the recessed part 42 which can fit one end of the rod-shaped body 41 for turning the scraper 31B is formed in both sides. After inserting one end of the rod-shaped body 41 into the recessed portion 42, the operator moves the other end of the rod-shaped body 41 in the turning direction of the scrapers 31A and 31B to retreat the tip of the plunger 43. By doing so, the fixing of the proximal end of the holding portion 33 by the plunger 43 is released, and the scrapers 31A and 31B can be rotated.

And, when turning the scrapers 31A, 31B from the standby position to the processing position, it is necessary to stop the scrapers 31A, 31B accurately at the processing position. As described above, the scrapers 31A and 31B can be stopped at the processing position by the mechanism comprising the plunger 43 and the recessed portion 44, but it is preferable to ensure a reliable stop at the processing position. Therefore, in the rotary device 20 of this embodiment, while extending along the longitudinal direction of the turning shaft portion 22, a round bar-shaped stopper 25 is provided at a position spaced upward with respect to the turning shaft portion 22, there is. And, when the stopper 25 is made to turn one of the scrapers 31A, 31B by inserting the rod-shaped body 41 into the recessed part 42, when the scraper 31A, 31B becomes the processing position correctly, the rod It is provided at the height position where the side surface of the front-end|tip side of the shape body 41 can contact the side surface of the stopper 25. As shown in FIG. Both ends of the stopper 25 are rotatably attached to the end plate 21 so as to be able to rotate around an axis extending in the longitudinal direction of the stopper 25 . As a result, when the scrapers 31A and 31B are turned from the standby position to reach the processing position, the tip of the plunger 43 engages with the recess 44 of the proximal end of the holding part 33 and the rod-shaped body 41 ) in contact with the stopper 25, that is to say, the scrapers 31A, 31B reliably stop at the processing position by the double mechanism.

Here, for example, it is considered that the scraper 31A is in the processing position and the scraper 31B is turned to the processing position from the state in which the scraper 31B is in the standby position. At this time, the scraper 31A must be extruded from the processing position by the turning of the scraper 31B, but the rod-shaped body 41 is in contact with the stopper 25 so that it cannot swing from the processing position to the stop position. is in a state In order for the scraper 31A to pivot from the processing position, it is necessary to take out one end of the rod-shaped body 41 from the recessed portion 42 formed on the outer peripheral surface of the proximal end portion of the holding portion 33 corresponding to the scraper 31A. However, the holding part 33 is configured such that it is rotated only in one direction by means of a one-way bearing or the like, and for this reason, the rod-shaped body 41 is strongly pressed against the stopper 25 and the rod-shaped body is released from the recessed part 42 . It may become difficult to take out (41). In order to stop the rotation of the scrapers 31A, 31B in the outer peripheral surface of the stopper 25, let the site|part which the rod-shaped body 41 comes into contact with, let it be a contact site|part. In this embodiment, in order to facilitate the removal of the rod-shaped body 41 from the recessed portion 42, a notch portion ( 45) is formed. When the round bar-shaped stopper 25 is rotated about its longitudinal axis by the lever 26 provided on the stopper 25 , the bar that is in contact with the stopper 25 at the contact portion of the stopper 25 . The shape 41 is not brought into contact with the stopper 25 because of the notch 45 . Because of the notch 45 , the rod-shaped body 41 is not pressed from the side side in a state not in contact with the stopper 25 , so that it can be easily separated from the recessed portion 42 .

Therefore, in order to pivot the scraper 31B to the processing position from the state in which the scraper 31B is in the standby position in the processing position with the scraper 31A in the processing position, after rotating the stopper 25, the rod type corresponding to the scraper 31A The upper body 41 is taken out, the rod-shaped body 41 corresponding to the scraper 31B is rotated, the scraper 31B is once turned to a contact position, and then it is moved to the processing position. The scraper 31A is extruded from the processing position by the scraper 31B and pivots to the stop position.

Next, the manufacturing method of the microporous film performed using the rotating apparatus 20 which has the above-mentioned removal object removal function is demonstrated. When manufacturing a polyolefin microporous membrane as a microporous membrane, first, diluents, such as liquid paraffin, are added to polyolefin resin, these are melt-kneaded with a twin screw extruder etc., and a resin solution is obtained. And the resin solution is extruded in the form of a film on the outer peripheral surface of the cooling roll which is the cylindrical body 10 using nozzles, such as a T-die. At this time, the cooling roll is a cylindrical body 10, and the removal target object, such as a diluent which remains on the surface, is removed by the rotating apparatus 20 of this embodiment. By extruding the resin solution toward the outer peripheral surface of the cooling roll, the resin solution is cooled to obtain a sheet-shaped molded product. While the cooling roll is rotated, an object to be removed, such as a diluent, is removed from the outer peripheral surface of the cooling roll by a rotating device 20 having an object removal function, and the resin solution is continuously extruded against the outer peripheral surface of the cooling roll from which the object to be removed has been removed. , a sheet-like molded product is continuously obtained as a long film. This sheet-like molded product is stretched in the machine direction (MD) and transverse direction (TD), and then the diluent is dissolved and removed from the sheet-like molded product using a cleaning solvent or the like to obtain a polyolefin microporous film film.

Moreover, when manufacturing a film using the rotating apparatus 20 which has the said removal object removal function, a resin sheet is formed by extruding and cooling raw material resin on the surface of the cylindrical body 10 from a nozzle|cap|die. Accordingly, the low molecular weight component contained in the raw material resin or the like adheres to the surface of the cylindrical body 10 as a removal object, so that the removal object is removed by the rotating device 20 having a removal object removal function of the present invention. Then, a film is obtained by performing an extending|stretching process with respect to the cooled resin sheet.

In the rotary device 20 having a removal function of the present invention described above, the first scraper 31A and the second scraper 31B can rotate around the pivot shaft 22 while changing the distance between them. Therefore, by controlling the turning of these scrapers 31A and 31B, the position at which the scrapers 31A and 31B on the outer peripheral surface of the cylindrical body 10 contact is not substantially changed, and furthermore, the cylindrical body 10 . The other scraper 31B from the state in which one scraper 31A, 31B is in contact with the outer peripheral surface of the cylindrical body 10 without interposing the time when either scraper 31A, 31B is not in contact with (31A) can be switched instantaneously to the state in which it is in contact. Therefore, the removal of the object to be removed from the outer peripheral surface of the cylindrical body 10 can be continued, without stopping the rotation of the cylindrical body 10 . That is, in manufacture of a film, it becomes possible to manufacture a film of stable quality, without stopping a manufacturing process. Therefore, with respect to the scrapers 31A and 31B which do not come into contact with the cylindrical body 10, sufficient time can be allocated for replacement|exchange and cleaning of the blades 32A and 32B.

And, in exchanging the scrapers 31A, 31B as described above, when one and the other of these scrapers 31A and 31B are respectively located at the contact position and the processing position, respectively, the scrapers 31A and 31B overlap each other so as to overlap each other. constitutes the shape of Specifically, while the back surface of the other scraper 31B, 31A enters the inner surface of one scraper 31A, 31B, the other scraper 31B (31B) ( 31A) is provided with a receiving part for accommodating the rear surface. Therefore, while the scrapers 31A and 31B contact each other and make it a structure which can perform switching quickly, damage|damage of the scrapers 31A and 31B accompanying the said contact can be suppressed.

Moreover, with respect to the structure 33 which hold|maintains the scraper 31A on the turning shaft part 22 so that rotation is possible, and the structure 33 which holds the scraper 31B on the turning shaft part 22 so that rotation is possible, the turning shaft part 22 ) are arranged to be arranged alternately along the longitudinal direction. Therefore, the stress applied to these scrapers 31A, 31B becomes substantially the same, and the distribution of the said stress in the longitudinal direction of the turning shaft part 22 also becomes substantially equal. Therefore, even if there exists the scraping remainder of the object to be removed on the cooling roll by the one scraper 31A, it will be in the same state also in the other scraper 31B, for example. Therefore, even if the scrapers 31A and 31B are replaced, the change in the surface state on the cooling roll is suppressed, so that the influence of the replacement on the film can be minimized or there is no influence.

That is, although the object to be removed on the cooling roll is scraped by the scrapers 31A, 31B, the object to be removed may be completely scraped. For example, the scraper 31A, 31B to the cooling roll Depending on the magnitude of the contact pressure or the surface roughness of the cooling roll, even if the object to be removed is scraped with the scrapers 31A and 31B, very little remains in some cases. When such an object to be removed remains, the resin solution cooled on the cooling roll proceeds to a subsequent step while the object to be removed is drawn in. Therefore, in the film used as a product, parameters on various processes are adjusted so that the physical properties are within the standard values in the state where the object to be removed is drawn in. On the other hand, if some conditions in the process change after the parameters on various processes are adjusted, specifically, if the amount of the object to be removed scraped by the scrapers 31A and 31B in the cooling roll decreases or increases, the The physical properties of the adjusted film change after the object to be removed is drawn in, and as a result, the product may exceed the standard value. In other words, even if the object to be removed on the cooling roll is completely scraped, even if there is a residual amount to some extent, it is important to continue the production of the film while continuing the scraping state. In the present invention, when exchanging the scrapers 31A and 31B, as described above, the scraper so that the contact pressure applied to the cooling roll becomes even between the scrapers 31A and 31B, and so that the distribution of the stress is even in the longitudinal direction. The arrangement of the members holding the 31A and 31B is adjusted. Therefore, even if the scrapers 31A and 31B are replaced multiple times or multiple times, manufacturing can be continued while suppressing the influence on a product. Therefore, for example, also in the case of producing a film of a length of 3000 m or 6000 m or longer, it can be produced while accommodating the film within a specific standard.

As described above, in replacing the scrapers 31A and 31B without stopping the rotation of the cooling rolls, the scrapers 31A and 31B are inclined so as to lie down toward the downstream side in the rotational direction of the cooling rolls. That is, the angle between the blades 32A and 32B attached to the scrapers 31A and 31B and the tangent at the point where the blades 32A and 32B contact the cooling roll when viewed from the end of the turning shaft portion 22 . is set to be 15° or more and 45° or less, that is, it is in the “reverse angle” type. This point will be described in detail.

Specifically, in the case where the scrapers 31A and 31B are inclined so as to be laid down as they go toward the upstream side in the rotational direction of the cooling roll, if FIG. 2 is used for explanation, for example, the cylindrical body 10 is It rotates in the reverse direction (clockwise). In that case, when exchanging the scrapers 31A and 31B, the object to be removed in the region between these scrapers 31A and 31B is not removed with the rotation of the cooling roll, but flows downstream in the rotational direction. On the other hand, by setting the turning direction of the scrapers 31A, 31B in a direction opposite to that of FIG. 2 in conjunction with the rotation direction of the cooling roll, it is considered that the removal of the object to be removed between the scrapers 31A and 31B can be prevented. However, when exchanging the scrapers 31A and 31B in the processing position and turning them to the stop position, the scrapers 31A and 31B need to move upward against gravity, so it is necessary to apply such a drive system to the apparatus. It becomes necessary and leads to an enlargement of the device. Accordingly, the present invention realizes a simple device configuration that can be practically implemented by employing a reverse angle method in continuously cleaning the surface of the cooling roll.

By the way, when the object to be removed adhering to the blades 32A and 32B is deposited on the blades 32A and 32B as it is, the low molecular weight resin component contained in the plasticizer aggregates and solidifies. When such solids are generated, if they flow downstream in the rotational direction of the cooling roll, they are drawn into the resin solution as foreign substances. Do. On the other hand, as described above, in the present invention, the scrapers 31A and 31B are each independently configured to be swiveling, and a nozzle for blowing air cannot be disposed within the swiveling region. Moreover, when air is blown toward the blades 32A, 32B from the outside of the said turning area|region, air will be blown out by the large flow volume which is not originally required, and it will lead to the increase of running cost. Moreover, when blowing air from one edge part toward the other edge part among the both ends of the turning shaft part 22, it will become difficult to guarantee the flow velocity of air on the said other edge part side.

Therefore, in the present invention, the turning shaft portion 22 for turning the scrapers 31A, 31B is hollow to form a gas flow region, and the blade ( Gas (air) is blown out to 32A and 32B). Therefore, the object to be removed (liquid plasticizer and resin component dissolved in the plasticizer) collected by the blades 32A and 32B is rapidly discharged from the system by blowing air from the proximity position facing the blades 32A and 32B. It discharges to the edge part side of the turning shaft part 22), and generation|occurrence|production of a solid foreign material is suppressed. And, since air is blown from the center of the swing shaft portion 22, compared with the case where air is blown out from the end of the swing shaft portion 22, the residence time for the object to be removed to stay on the blades 32A, 32B is half, so to speak. Since it can be reduced to a certain degree, generation|occurrence|production of a foreign material can also be suppressed from this point.

Moreover, the plunger 43 is provided as the recessed part 44 and locking part on the outer peripheral surface of the base end part of the holding part 33 corresponding to the position where the scrapers 31A, 31B respectively stop. Therefore, each process can be reliably performed at each position. In particular, as described above, the processing position is an important management item that is also related to the characteristics of the film, which is a product, and thus, the product quality can be stabilized from the fact that the position is determined reliably in this way.

In addition, the operator uses a mechanism (rod-shaped body 41) for turning the scrapers 31A and 31B, and a function is provided in which the scrapers 31A and 31B more reliably stop at the processing position. Specifically, the stopper 25 for stopping the rotation of the scrapers 31A, 31B by interfering with the rod-shaped body 41 which rotates together with the scrapers 31A, 31B in a processing position is provided. Therefore, in addition to the mechanism comprising the concave portion 44 and the plunger 43 described above, more certainty can be ensured for the stabilization of product quality.

In the above description, although the example of removing the object to be removed adhering to the outer circumferential surface of the cylindrical body 10 has been described, for example, the outer circumferential surface of the cylindrical body 10 is a mesh capable of holding a coating liquid such as liquid, ink, vehicle, etc. The present invention may also be applied to a print process comprising a liquid holding member such as a screen or a screen and printing on a print target such as paper or cloth through the liquid holding member. In that case, the coating liquid is supplied to a liquid replenishment site that is a part of the outer peripheral surface of the cylindrical body 10, and two scrapers 31A, 31B on the downstream side in the rotational direction of the cylindrical body 10 with respect to the liquid replenishing site. ), the excess coating liquid (which has leaked from the liquid holding member) is removed, and thereafter, the printing object is subjected to a satisfactory printing process (the occurrence of liquid spreading and the like is suppressed).

In addition, in the above description, although the case where the scraper apparatus has two scrapers 31A, 31B was demonstrated, in addition to these scrapers 31A and 31B, another one or more scrapers 31 are used, and three or more scrapers are used. You may remove the removal object by this.

Fig. 3 is a schematic side view showing another example (1) of the scraper device. In another example (1), the scraper apparatus has three scrapers 31A, 31B, and 31C. Also in this case, while one scraper is hold|maintained at a processing position, while the remaining two scrapers are located, respectively at an exchange position and a stand-by position, respectively.

In addition, in the above description, as a holding mechanism for holding the scraper, a fixed, non-rotating pivoting shaft portion 22 is used, and a configuration in which the scraper is pivotably attached to the pivoting shaft portion 22 has been described. However, the scraper holds it It may be rotated integrally with the member to be used. 4 is a view showing another example (2) of the scraper device. This scraper device has a cylindrical body 51 and the hollow cylindrical body 52 formed in the outer periphery of this cylindrical body 51 concentrically. The cylindrical body 51 may be hollow. Further, the scraper 31A is integrally formed with the cylindrical body 51 , and the scraper 31B is integrally formed with the hollow cylindrical body 52 . Both ends of the cylindrical body 51 and both ends of the hollow cylindrical body 52 are supported by the end plate so as to be rotatable about the rotation axis of the cylindrical body 51 and the hollow cylindrical body 52 . Accordingly, the scraper 31A is capable of turning together with the cylindrical body 51 , and the scraper 31B is capable of turning with the hollow cylindrical body 52 . And since the hollow cylindrical body 52 is relatively rotatable with respect to the cylindrical body 51, the scraper 31A and the scraper 31B are also relatively rotatable.

In addition, in the above description, although the scrapers 31A, 31B are hold|maintained by the turning shaft part 22 so that turning is possible, the scrapers 31A, 31B may be hold|maintained so that movement other than turning may be carried out. As shown in FIG. 5, in the other example 3 of a scraper apparatus, the scrapers 31A, 31B are slidably hold|maintained by the guide 55 comprised as a holding mechanism holding these scrapers. The guide 55 is provided in parallel to the tangential direction of the columnar body 10 in a processing position, for example, and the scrapers 31A, 31B move from upper direction to a processing position. The guide 55 is also provided with a plunger 43 for holding the scrapers 31A, 31B in the processing position. When another scraper 31B contacts from above with respect to the scraper 31A held at the processing position, while contact of the scraper 31B and the cylindrical body 10 is started, the plunger with respect to the scraper 31A The locking at 43 is released, and the scraper 31A moves downward. In addition, the guide 55 may have a linear shape like FIG. 5, and may have a curved part. In addition, the guide 55 may be made so that a scraper may return upward through an exchange position from below.

(Example)

Hereinafter, the present invention will be described in more detail by way of Examples and the like. In addition, this invention is not limited to these examples.

[Example 1]

Film formation of the microporous polyolefin resin sheet was performed for 2 weeks using the sheet manufacturing apparatus which concerns on embodiment mentioned above.

(1) sheet material

As the polyolefin used as the microporous polyolefin resin sheet material, high-density polyethylene (HDPE) and a viscosity of 1000 Pa·s were used. Here, a viscosity is measured by the method prescribed|regulated to JISK7117-2 under the conditions of a shear rate of 100/s and a temperature of 200 degreeC. Liquid paraffin (LP) and a kinematic viscosity of 51 cSt (at 40°C·mm ² /s) were used as the diluent.

(2) Preparation

The sheet material was supplied to an extruder after drying and melt-kneaded together with a diluent, and then supplied to a nozzle for sheet molding. In addition, the device temperature up to detention was set at 230°C.

(3) sheet forming detention

Using a nozzle having a slit width of 300 mm, the resin solution after melt-kneading was discharged at 70 kg/hr. In addition, LP density|concentration in resin solution shall be 70 mass %, and 49 kg/hr is LP.

(4) Cast cooling device

As the cooling roll of the cast cooling device, a sheet forming roll having a mirror surface was used. After extruding into a sheet form from a sheet forming nozzle, it shape|molded at the casting speed of 15 m/min on the sheet forming roll which set roll temperature to 35 degreeC.

(5) scraper

As shown in the state A of FIG. 1 using the present invention, grounding was performed so that the formed angle θ was 45° from the acute angle side. In addition, the air for discharging the object to be removed was blown out from the vicinity of the center to the blade.

(6) Defect detection

The conditions of said (1)-(5) were employ|adopted and the fault in the microporous membrane obtained using the above-mentioned microporous membrane manufacturing apparatus was detected using the fault detector of the permeation|transmission system. In both the film forming flow direction (MD direction) and the width direction (TD direction), the fault whose dimension is 10 mm or more was made into the foreign material fault which generate|occur|produced at the scraper origin.

(7) Results

In the produced microporous membrane having a width of 1800 mm x length of 2000 m/sheet, the average number of defects was 0.03/sheet. In the above-mentioned film forming period, since the average of 0.50 defects of four films immediately adjacent to the management value was exceeded twice, the blades were switched twice. The number of faults at the time of switching was all 0, and the scraper was able to be replaced|exchanged without stopping product film forming.

[Comparative Example 1]

A microporous membrane was manufactured in the same manner as in Example 1 except that the configuration of the scraper was changed. The manufacturing method of a specific resin sheet is as follows.

(1) scraper

In the structure shown in FIG. 3, the scraper 46 which consists of a silicone rubber of hardness 70 degree|times was provided. It was installed so that the angle (alpha) formed might be 45 degrees from the acute-angle side. In addition, the air for removal object discharge|emission was ejected toward the other edge part from one edge part.

(2) Results

In the produced microporous membrane having a width of 1800 mm x length of 2000 m/sheet, the average number of defects was 0.20/sheet. Moreover, in order to exceed the average 0.50 fault of 4 film-forming straight roots which is a control value 3 times within the above-mentioned film forming period, the microporous film manufacturing apparatus was stopped 3 times. Therefore, compared with Example 1, the production loss of 36 h generate|occur|produced.

This application is based on the Japanese Patent Application (Japanese Patent Application No. 2019-177759) of an application on September 27, 2019, The content is taken in here as a reference.

(Industrial Applicability)

ADVANTAGE OF THE INVENTION According to this invention, it is a scraper apparatus which removes the removal object adhering to the outer peripheral surface of a cylindrical body rotatable around a rotating shaft, Comprising: It exhibits the effect that blade exchange can be performed without stopping rotation of a cylindrical body. The present invention exhibiting this effect is a scraper device used for removing deposits or excess material adhering to the outer circumferential surface of a cylindrical body, and a rotating device having a function to remove an object to be removed such as deposits or excess material, and removal from the outer circumferential surface of the cylindrical body It is useful regarding the method of removing an object, the manufacturing method of the film using the said method, and the manufacturing method of a microporous membrane.

10 Cylinder shape
11 holding
20 rotator
21 end plate
22 swivel shaft
23 shaft fixing part
24 gas inlet
25 stopper
26 lever
27 supply hole
28 squirt hole
31A, 31B scraper
32A, 32B blades
33 maintenance
34 receptacle
41 rod-shaped body
42 depression
43 plunger
44 recess
45 notch
46 Scraper (Doctor Blade)
51 cylinder
52 hollow cylinder
55 guide

Claims (17)

A scraper device for removing an object to be removed adhering to an outer peripheral surface of a cylindrical body rotatable around a rotating shaft, comprising:
a holding mechanism for movably holding a plurality of scrapers including at least first and second scrapers;
The holding mechanism holds the first scraper in a processing position for removing the object to be removed adhering to the cylindrical body, and the second scraper comes into contact with the first scraper and moves to a position where the object to be removed can be removed. When this is done, the scraper device which separates the said 1st scraper from the said processing position. The method of claim 1,
the holding mechanism has a pivot shaft portion extending parallel to the axis of rotation;
The plurality of scrapers is a scraper device that relatively rotates around the pivot shaft portion. 3. The method of claim 2,
The turning shaft part is formed on at least one of both ends of the turning shaft part, and a supply hole through which gas is supplied from the outside, a gas flow area formed inside the turning shaft part so as to communicate with the supply hole, and the turning shaft part supplied to A gas ejection unit for ejecting gas is provided;
The gas ejection portion is provided at a substantially central portion in the longitudinal direction of the turning shaft portion so as to communicate with the gas flow region, and the removal in one of the first scraper and the second scraper located at the treatment position A scraper device comprising an ejection hole for ejecting gas to the scraping portion of the object, and ejecting the object to be removed by the scraper. 4. The method of claim 2 or 3,
The scraper device wherein the first scraper and the second scraper are configured to overlap each other when they come into contact with each other in accordance with the turning around the pivot shaft portion. 5. The method according to any one of claims 2 to 4,
A scraper device having a receiving portion formed on the inner surface of the first scraper and the inner surface of the second scraper to receive the rear surface when the rear surface of the second scraper and the rear surface of the first scraper enter, respectively. 6. The method of claim 5,
The accommodating part of the said 1st scraper and the accommodating part of the said 2nd scraper are respectively comprised so that the back surface of the said 2nd scraper and the back surface of the said 1st scraper may enter. 7. The method according to any one of claims 2 to 6,
Each of the first scraper and the second scraper is a scraper device having a plate-shaped blade made of an elastic body detachably provided at a portion separated from the pivot shaft portion. 8. The method according to any one of claims 2 to 7,
A first holding part and a second holding part are installed along the longitudinal direction of the turning shaft part,
The first holding portion includes a proximal end attached to the pivot shaft so as to be able to pivot around the pivot shaft, an arm extending from the base end to hold the first scraper, and the pivoting shaft through the first scraper. having a first holding part proximal end pivoting with the first holding part;
The second holding portion includes a proximal end attached to the pivot shaft so as to be able to pivot around the pivot shaft, an arm extending from the base end to hold the second scraper, and the second holding portion passing the second scraper around the pivot shaft. 2 having a second holding part proximal end pivoting together with the holding part;
In addition, a locking portion configured to protrude/retract toward the proximal end of the first holder and the proximal end of the second holder is provided,
A concave portion is formed on each of the outer circumferential surfaces of the proximal end of the first holding portion and the proximal end of the second holding portion, the distal end of the locking portion engageable, and the distal end of the locking portion engages the concave portion to thereby engage the first and second holding portions. A scraper device in which a proximal end is fixed with respect to the pivot shaft. 9. The method of claim 8,
A depression capable of inserting one end of a rod-shaped body for turning the first scraper into at least one of the outer circumferential surface of the proximal end of the first holding part and the outer circumferential surface of the first holding part located farthest from the proximal end of the first holding part wealth is formed,
A depression capable of inserting one end of a rod-shaped body for turning the second scraper into at least one of the outer peripheral surface of the second holding part proximal end and the outer peripheral surface of the second holding part located farthest from the second holding part base end A scraper device with a section formed therein. 10. The method of claim 9,
While extending along the longitudinal direction of the pivot shaft, it is installed at a position spaced upward with respect to the pivot shaft, and when one scraper of the first scraper and the second scraper is rotated, the side surface of the rod-shaped body collides The scraper apparatus further provided with the rod-shaped stopper which stops the rotation of the said one scraper by doing this. The scraper device according to any one of claims 1 to 10;
Having a cylindrical body,
A rotary device having a removal object removal function provided in the columnar body so that either one of the first scraper and the second scraper removes the object to be removed from the outer peripheral surface of the cylindrical object. 12. The method of claim 11,
The angle between the blades of the first scraper and the second scraper, and the tangent to the outer peripheral surface of the cylindrical body at the point where the blades are in contact, as viewed from the distal end direction in the longitudinal direction of the cylindrical body, is A rotating device with a removal function of 60° or less from the acute angle side. The scraper device according to any one of claims 8 to 10;
Having a cylindrical body,
Either one of the first scraper and the second scraper is provided in the cylindrical body so as to remove the object to be removed from the outer peripheral surface of the cylindrical body,
The first holding part and the second holding part rotate in the same direction as the rotational direction of the cylindrical body, but do not rotate in the opposite direction to the rotational direction. Device. 14. The method of claim 13,
With respect to the first scraper in the processing position, a position where the other scraper that has turned is in contact is a contact position, a position in front of the contact position and a position spaced upward from the contact position is a standby position, , a position where the first scraper stops away from the processing position when the other scraper turns from the contact position to the processing position is a stop position, the processing position, the contact position, the standby position and the stop position A position where the first scraper is exchanged at a position that does not interfere with the
The concave portion is provided at four places corresponding to the processing position, the stop position, the exchange position, and the standby position of the corresponding scraper, respectively, at the first holding part proximal end part and the second holding part proximal end part, respectively. Rotating device with removal function. A removal object removal method comprising the step of removing the object to be removed from the surface of the columnar body using the rotating device according to any one of claims 10 to 14 and the step of discharging according to claim 3 . A step of extruding resin from a nozzle to form a resin sheet, bringing the resin sheet into contact with the outer peripheral surface of the columnar body, and cooling and solidifying the resin sheet;
The manufacturing method of the film which has a process of removing an object to be removed from the surface of the said column-shaped body using the rotating apparatus which has the object removal function in any one of Claims 11-14. The resin is a resin solution comprising a polyolefin resin and a diluent,
A method for producing the film according to claim 16,
The manufacturing method of the microporous membrane which has the process of removing the said diluent from the said resin sheet solidified by cooling, and obtaining a microporous membrane.

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