JP2017193058A - Deposition device and deposition method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deposition device and deposition method capable of sufficiently preventing both terminal parts of molten resin with a sheet shape, which is extruded from an extrusion part, from swelling without changing the shape of an inside of the extrusion part.SOLUTION: A deposition device 10 has an extrusion part 12 for extruding a molten resin and a roll 20 to which a resin extruded from the extrusion part 12 and molten with a sheet shape is wound, the resin extruded from the extrusion part 12 and molten with a sheet shape is wound in a part of area in a circumferential direction of the roll 20. The roll 20 has a structure that diameter of both terminal parts in an axial direction thereof are the largest.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a film forming apparatus and a film forming method for forming a resin film by extruding a molten resin (for example, a thermoplastic resin) from an extrusion portion and cooling the extruded sheet-like molten resin. .

  As a method of producing a resin film such as a thermoplastic resin film, a thermoplastic resin melt-kneaded by an extruder is extruded into a sheet shape by an extrusion T-die attached to the tip of the extruder, and this extrusion is performed. There is known a method of cooling a sheet-shaped molten thermoplastic resin by winding it on the outer peripheral surface of a cooling roll. Here, the sheet-like melted thermoplastic resin extruded from the extrusion-molding T-die has a thicker end than the center portion due to the so-called “neck-in phenomenon” (that is, the sheet-like melted heat There is a tendency that both ends of the plastic resin swell). For this reason, in the manufacturing process of a resin film, the edge part where thickness became large is cut and discarded. However, such a method has a problem that the width of the resin film as a final product becomes small and the cost of the raw material increases, which is uneconomical.

  For this reason, in order to make the thickness of the sheet-like molten thermoplastic resin extruded from the T-die for extrusion molding uniform, and to suppress the cutting of the end portion where the thickness has been increased as much as possible, Have been devised. For example, in Patent Documents 1 to 3, by limiting the size of both ends of the flow path of the thermoplastic resin in the extrusion T-die attached to the tip of the extruder, A method of suppressing the swelling of both ends of the extruded sheet-like molten thermoplastic resin is disclosed. Further, in Patent Document 4, the extrusion end of the die lip constituting the flow gap of the extrusion molding T-die is protruded in the thermoplastic resin ejection direction at both ends of the extrusion molding T-die. There is disclosed a method for suppressing swelling of both end portions of a sheet-like molten thermoplastic resin extruded from a T die for use.

JP 2010-83060 A JP 2011-245738 A JP 2011-73156 A JP 62-170319 A

  In the methods disclosed in Patent Documents 1 to 4, by devising the shape of the extrusion-molding T-die, the bulges at both ends of the sheet-like molten thermoplastic resin extruded from the extrusion-molding T-die are removed. However, in such a method, it is not possible to sufficiently suppress the swelling of both end portions of the sheet-like molten thermoplastic resin, and it is necessary to change the shape inside the T-die for extrusion molding. There was a problem that it took time and effort.

  The present invention has been made in consideration of such points, and both end portions of the molten resin in a sheet shape extruded from the extrusion portion swell without changing the internal shape of the extrusion portion. An object of the present invention is to provide a film forming apparatus and a film forming method capable of sufficiently suppressing this.

  The film forming apparatus of the present invention includes an extruding unit that extrudes a molten resin, and a roll that is extruded from the extruding unit and wound with a sheet-like molten resin, and is extruded from the extruding unit. The sheet-shaped melted resin is wound around a partial region in the circumferential direction on the outer peripheral surface of the roll, and the roll has a configuration in which the diameters at both ends in the axial direction are the largest. It is characterized by becoming.

  According to such a film forming apparatus, a part of the circumferential direction of the outer peripheral surface of the roll in which the diameter of both end portions in the axial direction of the molten resin extruded from the extrusion portion becomes the largest. It is designed to wind around the area. In this case, the sheet-like melted resin wound around the roll has a winding speed at both ends higher than the winding speed at the central portion. For this reason, the sheet-like molten resin extruded from the extruding part is subjected to a greater tension at both ends than the center part, and the both end parts are stretched in the extruding direction from the extruding part. . Thereby, it can fully suppress that the both ends of the sheet-like molten resin extruded from the extrusion part swell.

  In the film forming apparatus of the present invention, the roll may be a cooling roll that cools a sheet-shaped molten resin wound around a partial region in the circumferential direction on the outer peripheral surface of the roll.

  The film forming apparatus of the present invention may further include a gas injection unit that injects a gas to the molten resin in a sheet shape that is wound around the roll.

  In the film forming apparatus of the present invention, the roll is provided on a cylindrical central portion having substantially the same diameter and on both sides of the central portion, and the diameter gradually increases toward the outside in the axial direction. You may have a taper part which becomes large.

  In this case, the ratio of the axial length of the central portion to the total length of the roll may be in a range of 0.35 to 0.65.

  In addition, the ratio of the diameter of the both ends of the roll to the diameter of the central portion may be in the range of 1.05 to 1.3.

  The film forming method of the present invention includes a step of extruding a molten resin from an extruding portion, and a sheet-like molten resin extruded from the extruding portion so that the diameters at both ends in the axial direction are the largest. And a step of winding around a partial region in the circumferential direction on the outer peripheral surface of the roll.

  According to such a film forming method, the sheet-shaped molten resin extruded from the extruding part is a part in the circumferential direction on the outer peripheral surface of the roll so that the diameters at both ends in the axial direction are the largest. It is designed to wind around the area. In this case, the sheet-like melted resin wound around the roll has a winding speed at both ends higher than the winding speed at the central portion. For this reason, the sheet-like molten resin extruded from the extruding part is subjected to a greater tension at both ends than the center part, and the both end parts are stretched in the extruding direction from the extruding part. . Thereby, it can fully suppress that the both ends of the sheet-like molten resin extruded from the extrusion part swell.

  According to the film forming apparatus and the film forming method of the present invention, it is sufficient that both end portions of the sheet-like molten resin extruded from the extrusion portion swell without changing the shape inside the extrusion portion. Can be suppressed.

It is a block diagram which shows schematically the structure of the film-forming apparatus by embodiment of this invention. It is a top view which shows a structure when the cooling roll and gas injection part in the film-forming apparatus shown in FIG. 1 are seen from upper direction. It is a block diagram which shows an example of a structure of the cooling roll shown in FIG. 1 and FIG. 2 in detail. It is a block diagram which shows the other example of a structure of the cooling roll provided in the film-forming apparatus by embodiment of this invention. It is a block diagram which shows the further another example of a structure of the cooling roll provided in the film-forming apparatus by embodiment of this invention. It is a block diagram which shows roughly the structure of the film-forming apparatus which concerns on a modification.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are views showing a film forming apparatus according to this embodiment. Among these, FIG. 1 is a block diagram schematically showing the configuration of the film forming apparatus according to the present embodiment, and FIG. 2 is a top view of the cooling roll and the gas injection unit in the film forming apparatus shown in FIG. It is a top view which shows the structure at the time. FIG. 3 is a configuration diagram showing in detail an example of the configuration of the cooling roll shown in FIGS. 1 and 2. 4 and 5 are configuration diagrams showing other various examples of the configuration of the cooling roll provided in the film forming apparatus according to the present embodiment. FIG. 6 is a configuration diagram schematically showing the configuration of a film forming apparatus according to a modification. 1, 2, and 6, the sheet-shaped molten resin extruded from the discharge unit is indicated by a reference symbol W.

  As shown in FIG. 1, a film forming apparatus 10 according to the present embodiment includes an extruding unit 12 that extrudes a molten resin, and a roll 20 that is extruded from the extruding unit 12 and on which a sheet-like molten resin is wound. And a gas injection unit 30 that injects a gas such as air onto a sheet-shaped molten resin wound around a roll 20. Here, the extrusion part 12 is comprised from the T die for extrusion molding attached to the front-end | tip of an extruder, and resin, such as a thermoplastic resin melt-kneaded with the said extruder, is a figure from the extrusion part 12. 1 is pushed downward. The sheet-shaped molten resin extruded from the extruding unit 12 is wound around a partial region in the circumferential direction on the outer peripheral surface of the roll 20. Here, in this Embodiment, the roll 20 is comprised from the cooling roll which cools the sheet-like molten resin wound by the partial area | region of the circumferential direction in the outer peripheral surface of the said roll 20. FIG. In addition, the gas injection unit 30 is configured to press the sheet-shaped molten resin against the outer peripheral surface of the roll 20 by injecting a gas such as air onto the sheet-shaped molten resin wound around the roll 20. (In FIGS. 1 and 2, the flow of gas such as air injected from the gas injection unit 30 is indicated by arrows). Thus, the molten resin in sheet form is reliably cooled by the roll 20 as a cooling roll. The cooling roll is made of a general material such as stainless steel having excellent workability, rigidity, and heat conduction, and is cooled by a general cooling method using water or the like. Further, the constituent material of the cooling roll may be changed to copper or the like having higher heat conductivity, and an organic solvent or the like having higher cooling efficiency may be appropriately selected as a cooling method. Moreover, the gas injected from the gas injection part 30 is not limited to air, You may use gases, such as nitrogen and helium with high cooling efficiency. Furthermore, the temperature of the gas injected from the gas injection unit 30 can be selected as appropriate depending on the temperature of the sheet-shaped molten resin material and the cooling roll, but is lower than the temperature of the sheet-shaped molten resin. It is desirable to promote cooling and solidification.

  Moreover, in this Embodiment, the roll 20 becomes a structure that the diameter of the both ends in the axial direction becomes the largest. Details of the configuration of the roll 20 will be described with reference to FIGS. 2 and 3.

  As shown in FIG. 2 and FIG. 3, the roll 20 is provided with a cylindrical central portion 22 having substantially the same diameter and both sides of the central portion 22, and the diameter of the roll 20 is increased outward in the axial direction. The taper portion 24 has two taper portions 24 that gradually increase, and the diameter of each taper portion 24 at the both end portions in the axial direction of the roll 20 is the largest. According to the roll 20 having such a configuration, the diameter of each tapered portion 24 at the positions of both end portions in the axial direction of the roll 20 is larger than the diameter of the central portion 22, so that a sheet-like shape wound around the roll 20 is formed. The melted resin has a winding speed at both end portions larger than that at the center portion. For this reason, the sheet-like melted resin extruded from the extruding part 12 is subjected to a greater tension at both ends than the center part, and the both end parts are stretched in the direction of extruding from the extruding part 12. become. By this, it can fully suppress that the both ends of the sheet-like molten resin extruded from the extrusion part 12 swell.

  The configuration of the roll 20 will be described in more detail. As shown in FIG. 3, the length of the central portion 22 in the axial direction of the roll 20 is a, the length of each tapered portion 24 is b, and the total length of the roll 20 is c. In this case, the ratio of the axial length of the central portion 22 to the entire length of the roll 20 (that is, the size of a / c) is a size within the range of 0.35 to 0.65 (more preferably 0 375). Here, when the ratio of the axial length of the central portion 22 to the total length of the roll 20 is smaller than 0.35, the length of each tapered portion 24 in the axial direction of the roll 20 is too large, and thus the extrusion. The sheet-like melted resin extruded from the portion 12 is subjected to a large tension even at a location away from the end. For this reason, there exists a problem that the thickness of the location away from the edge part will become small about the molten resin of the sheet form extruded from the extrusion part 12. FIG. On the other hand, when the ratio of the axial length of the central portion 22 to the entire length of the roll 20 is larger than 0.65, the length of each tapered portion 24 in the axial direction of the roll 20 is relatively small. As a result, a sufficiently large tension is not applied to the end portion of the melted resin in the form of a sheet extruded from the extrusion portion 12. For this reason, there exists a problem that it cannot fully suppress that the both ends of the sheet-like molten resin extruded from the extrusion part 12 swell.

  Further, as shown in FIG. 3, the diameter of the central portion 22 is d, and the diameters of both ends of the roll 20 (that is, the taper portions 24 at the positions of both ends in the axial direction of the roll 20). When the difference between the radius of the central portion 22 and the radius of each tapered portion 24 at both ends in the axial direction of the roll 20 is f, the central portion 22 The ratio of the size of the diameter of both ends of the roll 20 to the size of the diameter (that is, the size of e / d) is a size within the range of 1.05 to 1.3 (more preferably 1.2 ). Here, when the ratio of the diameter size of both ends of the roll 20 to the size of the diameter of the central portion 22 is smaller than 1.05, the diameter of both ends of the roll 20 is relatively small. As a result, a sufficiently large tension is not applied to the end portion of the melted resin in the form of a sheet extruded from the extrusion portion 12. For this reason, there exists a problem that it cannot fully suppress that the both ends of the sheet-like molten resin extruded from the extrusion part 12 swell. Moreover, when the ratio of the size of the diameter of both ends of the roll 20 to the size of the diameter of the central portion 22 is larger than 1.3, the diameter of both ends of the roll 20 is too large. An excessive amount of tension is applied to the end of the melted resin in the form of a sheet extruded from. For this reason, there exists a problem that the thickness of the both ends of the sheet-like molten resin extruded from the extrusion part 12 will become smaller than the thickness of a center part.

  Further, it is desirable that the taper angle of each taper portion 24 (specifically, the angle indicated by the angle θ in FIG. 3) is also in a predetermined range. Such a taper angle θ is defined by an equation of tan θ = f / b.

  Note that the rolls such as cooling rolls used in the film forming apparatus 10 of the present embodiment are not limited to those having the configurations shown in FIGS. Another structural example of the roll used in the film forming apparatus 10 of the present embodiment will be described with reference to FIGS.

  A roll 40 having a configuration as shown in FIG. 4 is provided on a cylindrical central portion 42 having substantially the same diameter and on both sides of the central portion 42, and the diameter gradually increases outward in the axial direction. Two first taper portions 44 that increase in size, and two second taper portions 46 that are provided on both sides of each first taper portion 44 and that gradually increase in diameter toward the outside in the axial direction. The diameter of each of the second tapered portions 46 at the both end portions in the axial direction of the roll 40 is the largest. Here, the taper angle of each second taper portion 46 is larger than the taper angle of each first taper portion 44. According to the roll 40 having such a configuration, the diameter of each second tapered portion 46 at the positions of both end portions in the axial direction of the roll 40 is the same as that of the roll 20 having the configuration shown in FIGS. 2 and 3. By being larger than the diameter of the portion 42, the sheet-like molten resin wound around the roll 40 has a winding speed at both ends thereof higher than the winding speed at the center portion. For this reason, the sheet-like melted resin extruded from the extruding part 12 is subjected to a greater tension at both ends than the center part, and the both end parts are stretched in the direction of extruding from the extruding part 12. become. By this, it can fully suppress that the both ends of the sheet-like molten resin extruded from the extrusion part 12 swell.

  Further, the roll 50 having a configuration as shown in FIG. 5 is provided with a cylindrical central portion 52 having substantially the same diameter, and both sides of the central portion 52, and the diameter is increased outward in the axial direction. Two tapered portions 54 that gradually increase are provided, and the diameter of each tapered portion 54 at the both end portions in the axial direction of the roll 50 is the largest. Here, the taper portion 24 of the roll 20 as shown in FIGS. 2 and 3 has a uniform ratio of the increase in diameter with respect to the distance to the outside in the axial direction, as shown in FIG. Each of the tapered portions 54 of the roll 50 having such a configuration is configured such that the ratio of the increase in the diameter with respect to the outward distance in the axial direction is gradually increased, and each tapered portion 54 is directed outward in the axial direction. It has a so-called spreading shape. According to the roll 50 having such a configuration, the diameter of each tapered portion 54 at the positions of both end portions in the axial direction of the roll 50 is the central portion 52, as in the roll 20 having the configuration as shown in FIGS. 2 and 3. Is larger than the diameter of the sheet, the sheet-like molten resin wound around the roll 50 has a winding speed at both ends thereof higher than the winding speed at the central portion. For this reason, the sheet-like melted resin extruded from the extruding part 12 is subjected to a greater tension at both ends than the center part, and the both end parts are stretched in the direction of extruding from the extruding part 12. become. By this, it can fully suppress that the both ends of the sheet-like molten resin extruded from the extrusion part 12 swell.

  According to the film forming apparatus 10 of the present embodiment configured as described above and the film forming method using such a film forming apparatus 10, the sheet-like molten resin extruded from the extrusion unit 12 The roll 20 is wound around a partial region in the circumferential direction on the outer circumferential surface of the roll 20 so that the diameters at both ends in the axial direction are the largest. In this case, the sheet-shaped melted resin wound around the roll 20 has a winding speed at both end portions higher than the winding speed at the central portion. For this reason, the sheet-like melted resin extruded from the extruding part 12 is subjected to a greater tension at both ends than the center part, and the both end parts are stretched in the direction of extruding from the extruding part 12. become. By this, it can fully suppress that the both ends of the sheet-like molten resin extruded from the extrusion part 12 swell.

  Further, in the film forming apparatus 10 of the present embodiment, as described above, the roll 20 cools the sheet-like molten resin wound around a partial region in the circumferential direction on the outer peripheral surface of the roll 20. It is a cooling roll. In this case, a resin film can be formed by cooling the molten resin in a sheet form extruded from the extruding unit 12 with a cooling roll.

  Moreover, in the film-forming apparatus 10 of this Embodiment, the gas injection part 30 which injects gas, such as air, to the sheet-like melted resin wound around the roll 20, as mentioned above is provided. In this case, the sheet-shaped molten resin can be pressed against the outer peripheral surface of the roll 20 by injecting a gas such as air onto the sheet-shaped molten resin wound around the roll 20. Become.

  Further, in the film forming apparatus 10 of the present embodiment, as described above, the roll 20 is provided on the cylindrical central portion 22 having substantially the same diameter and on both sides of the central portion 22. And a tapered portion 24 whose diameter gradually increases toward the outside in the axial direction. In this case, the ratio of the axial length of the central portion 22 to the entire length of the roll 20 is preferably in the range of 0.35 to 0.65. Further, it is preferable that the ratio of the diameter size of both ends of the roll 20 to the size of the diameter of the central portion 22 is in the range of 1.05 to 1.3.

  Note that the film formation apparatus according to the present embodiment is not limited to the above-described aspect, and various modifications can be made.

  For example, as a film forming apparatus according to the present embodiment, as shown in FIG. 6, there is a film forming apparatus 10a in which the installation of a gas injection unit for injecting a gas such as air to a sheet-like molten resin is omitted. May be used. In the film forming apparatus 10 a according to such a modification, the sheet-like molten resin extruded downward in FIG. 6 from the extrusion unit 12 is not the position of the outermost end on the outer peripheral surface of the roll 20 but the roll 20. It comes into contact with a position near the upper end in the vicinity of the outermost end of the outer peripheral surface, and is wound around the roll 20 while being cooled and solidified. Further, in such a film forming apparatus 10 a, tension is applied to the sheet-shaped molten resin between the extrusion unit 12 and the roll 20 by the force by which the sheet-shaped molten resin is taken up by the roll 20. Thus, the sheet-like melted resin can be stretched in the direction of extrusion from the extrusion portion 12 by such tension. Even in the film forming apparatus 10a having such a configuration, similarly to the film forming apparatus 10 as shown in FIG. 1 and the like, the sheet-like molten resin extruded from the extruding unit 12 is disposed at both ends in the axial direction. The roll 20 is wound around a partial region in the circumferential direction on the outer peripheral surface of the roll 20 that has the largest diameter. In this case, the sheet-shaped melted resin wound around the roll 20 has a winding speed at both end portions higher than the winding speed at the central portion. For this reason, the sheet-like melted resin extruded from the extruding part 12 is subjected to a greater tension at both ends than the center part, and the both end parts are stretched in the direction of extruding from the extruding part 12. become. By this, it can fully suppress that the both ends of the sheet-like molten resin extruded from the extrusion part 12 swell.

  Further, in the film forming apparatus according to the present embodiment, the roll 20 on which the sheet-like molten resin extruded from the extrusion unit 12 is first wound is not limited to the cooling roll. As a film forming apparatus according to another modification, a sheet-shaped molten resin extruded from the extrusion unit 12 is wound around a normal roll, and then a sheet-shaped molten resin unwound from the roll is obtained. It may be cooled by a cooling mechanism such as a cooling roll. In this case, the normal roll in which the sheet-like molten resin extruded from the extruding unit 12 is wound first is configured such that the diameters at both ends in the axial direction are the largest.

DESCRIPTION OF SYMBOLS 10, 10a Film-forming apparatus 12 Extrusion part 20 Roll 22 Central part 24 Tapered part 30 Gas injection part 40 Roll 42 Central part 44 1st taper part 46 2nd taper part 50 Roll 52 Central part 54 Tapered part

Claims (7)

An extrusion section for extruding the molten resin;
A roll on which a sheet-shaped molten resin extruded from the extrusion part is wound;
With
The sheet-shaped melted resin extruded from the extruding part is wound around a partial region in the circumferential direction on the outer peripheral surface of the roll,
The roll is a film forming apparatus configured such that the diameters at both ends in the axial direction are the largest.   The film forming apparatus according to claim 1, wherein the roll is a cooling roll that cools a sheet-shaped molten resin wound around a partial region in the circumferential direction on the outer peripheral surface of the roll.   The film-forming apparatus of Claim 1 or 2 further provided with the gas injection part which inject | pours gas into the sheet-like molten resin wound by the said roll.   The roll has a cylindrical central portion having substantially the same diameter, and a tapered portion that is provided on both sides of the central portion and gradually increases in diameter toward the outside in the axial direction. The film-forming apparatus as described in any one of Claims 1 thru | or 3.   The film forming apparatus according to claim 4, wherein a ratio of an axial length of the central portion to a total length of the roll is in a range of 0.35 to 0.65.   The film forming apparatus according to claim 4 or 5, wherein a ratio of a diameter size of both ends of the roll to a size of the diameter of the central portion is in a range of 1.05 to 1.3. Extruding molten resin from the extrusion part;
Winding the sheet-shaped melted resin extruded from the extruding portion around a partial region in the circumferential direction on the outer peripheral surface of the roll such that the diameter of both end portions in the axial direction is the largest;
A film forming method comprising:

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