JP2011235546A - Apparatus and method for manufacturing film or sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and method for manufacturing a film or a sheet having a superior quality by sufficiently reducing attachment of foreign matter to the lip mouth of a die.SOLUTION: The apparatus for manufacturing the film or the sheet includes an extruder, a die, a flow path which communicates the extruder with the die and a resin displacement mechanism which is disposed in the middle of the flow path, has such a configuration that the flow path is divided into a plurality of branched paths and, thereafter, the plurality of branched paths are again joined together, and changes positions of molten resin flowing through the flow paths. The resin displacement mechanism has at least first and second branched paths by which the molten resin fed from the flow paths is separated in an X-axis direction, on the position where the molten resin is transferred in a Z-direction toward the die. The first and second branched paths are separated from each other in the X-axis direction on the upstream side, thereafter, are extended so as to come close to each other and the positional relation in the X-axis direction is reversed and the first and second branched paths come close to each other and are joined on the downstream side.

Description

  The present invention relates to an apparatus and method for producing a film or sheet by extruding a molten resin from a die.

  The molten resin supplied from the extruder is transferred to a die through a feed pipe, and the molten resin is extruded from the die to produce a resin film (thickness of about 5 to 500 μm) or a resin sheet (thickness of about 500 μm to 50 mm). It is also possible to produce a multilayer film or a multilayer sheet by supplying molten resin to a single die from a plurality of extruders. Patent Document 1 listed below describes a method for producing a multilayer film using an apparatus having a plurality of flow paths.

JP-A-4-278324

  By the way, when a resin film or a resin sheet is molded over a certain period, foreign matters such as a deteriorated resin or an aggregate of additives may adhere to the lip opening of the die. The phenomenon in which foreign matter adheres to the lip mouth is referred to as “Meani” in the art. Once the foreign matter adheres to the lip mouth, the foreign matter accumulates at the location as the molding time elapses, and it comes into contact with the molten resin or enters the molded product.

  Since foreign matter accumulated in the lip mouth causes deterioration of the quality of the molded product, measures have been taken to improve the additive formulation and to apply special plating to the lip mouth to improve resin slipping. . However, the conventional technique cannot sufficiently reduce the adhesion of foreign matter to the lip mouth, and further improvement has been demanded.

  It is an object of the present invention to provide an apparatus and a method that can sufficiently reduce the adhesion of foreign matter to the lip opening of a die and can produce a film or sheet of excellent quality.

  When the molten resin is transferred from the extruder to the die through the flow path, the flow rate of the molten resin is low in the vicinity of the wall surface of the flow path, so that the region tends to stay. The inventors of the present invention have focused on the fact that foreign matters (resin degradation products and additive agglomerates) generated in the flow path due to the residence of the molten resin adhere to the lip mouth of the die. The present inventors have studied a technique for preventing foreign matter from being accumulated in the lip mouth even if foreign matter is generated due to staying in the vicinity of the wall surface of the flow path. As a result, just before the molten resin is introduced into the die, the molten resin that has flowed near the wall surface of the flow path is replaced with the molten resin that has flowed in the center of the flow path, so that foreign matter adheres to the lip mouth. The inventors have found that it can be sufficiently reduced, and have completed the following invention.

  The apparatus of the present invention is for producing a film or sheet, and includes an extruder for transferring a molten resin, a die for forming the molten resin from the extruder into a film or sheet, and an extruder. And a flow path that communicates with the die, and is provided in the middle of the flow path. After the flow path is divided into a plurality of branch paths, the plurality of branch paths are joined again, and the molten resin that flows through the flow path And a resin replacement mechanism for changing the position. When an XYZ orthogonal coordinate system is set in which the thickness direction of the molten resin extruded from the die is the X-axis direction and the width direction is the Y-axis direction, the resin replacement mechanism moves the molten resin toward the die in the Z direction. At least a first branch path and a second branch path for separating the molten resin supplied from the flow path in the X-axis direction. The first and second branch paths move away from each other in the X-axis direction on the upstream side, and then extend so as to approach each other, the positional relationship in the X-axis direction is reversed, and approach each other in the X-axis direction on the downstream side and merge. ing.

  The above apparatus can replace the resin flowing near the wall surface of the flow path with the resin flowing in the center of the flow path by the resin replacement mechanism. The resin that has flowed through the center of the flow path is unlikely to contain foreign matter due to retention. Prior to introducing the molten resin into the die, the resin with a low content of foreign matter flows in the vicinity of the wall surface of the flow path, making it difficult for foreign matter to adhere to the lip mouth and stable high-quality film or sheet. Can be manufactured.

  The present invention provides not only a single-layer film or single-layer sheet manufacturing apparatus but also a multilayer film or multilayer sheet manufacturing apparatus. That is, this invention is a manufacturing apparatus of a multilayer film or a multilayer sheet, Comprising: A plurality of extruders for respectively transporting a molten resin, and a method for forming a molten resin from a plurality of extruders into a film or a sheet A die, a plurality of flow passages communicating with the plurality of extruders and the die, respectively, and provided in the middle of the flow passage for transferring the molten resin forming the outermost layer of at least the multilayer film or the multilayer sheet among the plurality of flow passages, An apparatus is provided that includes a structure in which a plurality of branch paths merge again after the flow path is divided into a plurality of branch paths, and a resin replacement mechanism that changes the position of the molten resin flowing through the flow paths. When an XYZ orthogonal coordinate system is set in which the thickness direction of the molten resin extruded from the die is the X-axis direction and the width direction is the Y-axis direction, the resin replacement mechanism moves the molten resin toward the die in the Z direction. At least a first branch path and a second branch path for separating the molten resin supplied from the flow path in the X-axis direction. The first and second branch paths move away from each other in the X-axis direction on the upstream side, and then extend so as to approach each other, the positional relationship in the X-axis direction is reversed, and approach each other in the X-axis direction on the downstream side and merge. ing.

  The apparatus for producing a multilayer film or a multilayer sheet can replace the resin flowing near the wall surface of the flow path and the resin flowing in the center of the flow path with a resin replacement mechanism. This makes it difficult for foreign matter to adhere to the lip opening of the die, and a high-quality multilayer film or multilayer sheet can be stably produced. In particular, in a process for producing a multilayer film or multilayer sheet, if foreign matter accumulates in the lip opening, defects are likely to occur in the outermost layer of the multilayer film or multilayer sheet. For this reason, it is effective for quality improvement and yield improvement to provide at least the resin replacement mechanism in the flow path for transferring the molten resin forming the outermost layer.

  In addition, although the invention regarding the manufacturing apparatus of a multilayer film is described in the said patent document 1 (Unexamined-Japanese-Patent No. 4-278324), the said invention clearly differs in the subject which should be solved. In addition, although the drawing of Patent Document 1 shows an apparatus having a plurality of flow paths, the document describes a resin that has flown near the wall surface of the flow path, and a resin that has flowed in the center of the flow path. The technical idea of substituting is not disclosed.

  The method of the present invention is for producing a film or sheet, and includes a step of supplying a molten resin from an extruder to a die through a flow path, and a step of extruding the molten resin from the die to form a film or sheet. Prepare. When an XYZ orthogonal coordinate system is set in which the thickness direction of the molten resin extruded from the die is the X-axis direction and the width direction is the Y-axis direction, The resin replacement mechanism for changing the position of the molten resin flowing in the flow path is provided by transferring the molten resin in the Z direction toward the die again. By introducing the molten resin into at least the first and second branch paths that the resin replacement mechanism has, the molten resin in the first and second branch paths moves away from each other in the X-axis direction on the upstream side, and thereafter Flowing closer to each other, the positional relationship in the X-axis direction is reversed, and on the downstream side, they approach each other in the X-axis direction and merge.

  In the above method, the resin replacement mechanism replaces the resin that has flowed near the wall surface of the flow path with the resin that has flowed in the center of the flow path. This makes it difficult for foreign matter to adhere to the lip opening of the die, and a high-quality film or sheet can be stably produced.

  This invention provides not only the manufacturing method of a single layer film or a single layer sheet but the manufacturing method of a multilayer film or a multilayer sheet. That is, the present invention is a method for producing a multilayer film or a multilayer sheet, comprising a step of supplying molten resin from a plurality of extruders to a die through a plurality of flow paths, and extruding the molten resin from the die to form the multilayer film or multilayer Forming a sheet. When the XYZ orthogonal coordinate system is set with the thickness direction of the molten resin extruded from the die as the X-axis direction and the width direction as the Y-axis direction, the melting that forms at least the outermost layer of the multilayer film or multilayer sheet among the plurality of channels In the middle of the flow path for transferring the resin, after being divided into a plurality of branch paths, the plurality of branch paths again become one flow path to transfer the molten resin to the die in the Z direction, A resin replacement mechanism for changing the position of the flowing molten resin is provided. By introducing the molten resin into at least the first and second branch paths that the resin replacement mechanism has, the molten resin in the first and second branch paths moves away from each other in the X-axis direction on the upstream side, and thereafter Flowing closer to each other, the positional relationship in the X-axis direction is reversed, and on the downstream side, they approach each other in the X-axis direction and merge.

  In the above method for producing a multilayer film or a multilayer sheet, the resin replacement mechanism replaces the resin that has flowed in the vicinity of the wall surface of the flow path with the resin that has flowed in the center of the flow path. This makes it difficult for foreign matter to adhere to the lip opening of the die, and a high-quality multilayer film or multilayer sheet can be stably produced. In particular, in a process for producing a multilayer film or multilayer sheet, if foreign matter accumulates in the lip opening, defects are likely to occur in the outermost layer of the multilayer film or multilayer sheet. For this reason, it is effective to improve the quality and the yield by replacing the resin by providing at least the resin replacement mechanism in the flow path for transferring the molten resin forming the outermost layer.

  According to the present invention, it is possible to sufficiently reduce the adhesion of foreign matter to the lip opening of the die, and it is possible to manufacture a film or sheet with excellent quality.

It is a schematic diagram which shows suitable embodiment of the manufacturing apparatus of the multilayer film or multilayer sheet which concerns on this invention. It is sectional drawing which shows the internal structure of T die for manufacture of a multilayer film or a multilayer sheet. It is a schematic diagram which shows the structure of the resin replacement mechanism with which the apparatus shown in FIG. 1 is provided. It is a perspective view which shows the structure of the branch part of a resin substitution mechanism. It is sectional drawing which shows the structure of the branch part of a resin substitution mechanism. It is a perspective view which shows the structure of the 1st rearrangement part of a resin replacement mechanism. It is a perspective view which shows the structure of the 2nd rearrangement part of a resin replacement mechanism. It is a perspective view which shows the structure of the junction part of a resin substitution mechanism. It is a schematic diagram which shows a mode that molten resin is substituted by two branch paths. It is a perspective view which shows the structure of the flow path for connecting a flow path with a circular cross-sectional shape, and a rectangular flow path. It is a schematic diagram which shows one Embodiment of the manufacturing apparatus of the single layer film or single layer sheet which concerns on this invention.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to the drawings.

<Manufacturing apparatus for multilayer film or multilayer sheet>
A manufacturing apparatus 50 shown in FIG. 1 is for manufacturing a multilayer film or a multilayer sheet (hereinafter referred to as “multilayer molded body”). The manufacturing apparatus 50 communicates the three extruders 1A, 1B, and 1C, the T die 5 from which the molten resin from the extruders 1A, 1B, and 1C is extruded, and the extruders 1A, 1B, 1C, and the T die 5 respectively. Three flow paths 8A, 8B, 8C and resin replacement mechanisms 10A, 10B provided in the flow paths 8A, 8B, respectively. The flow paths 8A and 8B are flow paths that respectively transfer the molten resin forming the outermost layers 20A and 20B of the multilayer molded body 20 (see FIG. 2).

  Although there is no restriction | limiting in particular as extruder 1A, 1B, 1C, Usually, a single screw or a twin screw extruder can be used. Specific examples include screw extruders such as a single screw extruder, a same direction twin screw extruder, and a different direction twin screw extruder.

  As shown in FIG. 1, when an XYZ orthogonal coordinate system is set in which the thickness direction of the molten resin extruded from the die is the X-axis direction and the width direction is the Y-axis direction, the T die 5 has flow paths 8A and 8B. , 8C is provided such that the molten resin supplied through 8C is expanded in the Y-axis direction and discharged in the Z direction to form the multilayer molded body 20. As shown in FIG. 2, the multilayer molded body 20 is molded by discharging molten resin from the lip port 5 a of the T die 5 in the arrow direction of the Z axis. The multilayer molded body 20 includes outermost layers 20A and 20B and an intermediate layer 20C therebetween.

  The three flow paths 8A, 8B, 8C are for introducing the molten resin that has exited the extruders 1A, 1B, 1C into the T-die 5. Since the molten resin exiting the extruders 1A, 1B, and 1C has a temperature of about 150 to 500 ° C. and a pressure of about 0.1 to 50 MPa, the flow paths 8A, 8B, and 8C can withstand these conditions. It has a structure. The cross-sectional shapes of the flow paths 8A, 8B, 8C are preferably circular from the viewpoint of suppressing the stay of the molten resin.

  As shown in FIG. 3, the resin replacement mechanisms 10A and 10B are provided in the flow paths 8A and 8B, respectively. The resin replacement mechanism 10A has a configuration in which the flow path 8A is divided into two branch paths (first and second branch paths) 12A and 13A, and then the branch paths 12A and 13A are joined again. It has a function of changing the position of the molten resin that has flowed. Similarly to this, the resin replacement mechanism 10B has a configuration in which after the flow path 8B is divided into two branch paths (first and second branch paths) 12B and 13B, the branch paths 12B and 13B merge again. It has a function of changing the position of the molten resin that has flowed through the flow path 8B. The first and second branch paths are separated from each other in the X-axis direction on the upstream side, and then extend so as to approach each other in the X-axis direction and away from each other in the Y-axis direction, and the positions in the X-axis direction are reversed, and It is preferable that they extend so as to approach each other in the Y-axis direction so that the positional relationships in the Y-axis direction coincide with each other, and then approach each other in the X-axis direction and merge on the downstream side. Since the resin replacement mechanisms 10A and 10B have the same configuration and function, the resin replacement mechanism 10A will be described in detail below.

  As shown in FIG. 3, the resin replacement mechanism 10 </ b> A is provided at a position where the molten resin is transferred in the Z direction toward the T die 5. The two branch paths 12A and 13A are branched from the flow path 8A so that the molten resin supplied from the flow path 8A is separated in the X-axis direction. The branch paths 12A and 13A extend away from each other in the X-axis direction on the upstream side of the resin replacement mechanism 10A, and then extend so as to approach each other. Then, the branch paths 12A and 13A cross each other so that the positional relationship in the X-axis direction is reversed, and they approach and merge with each other in the X-axis direction on the downstream side of the resin replacement mechanism 10A. The molten resin leaving the resin replacement mechanism 10A is supplied to the T die 5 as it is.

  The configuration of the resin replacement mechanism 10A will be described in more detail with reference to FIGS. The resin replacement mechanism 10A includes a branch portion 15A, a first rearrangement portion 16A, a second rearrangement portion 17A, and a merging portion 18A, which are directed from the upstream side to the downstream side in the Z-axis direction. Is arranged. The molten resin supplied from the flow path 8A flows in the Z direction and is introduced into the branch portion 15A.

  The resin replacement mechanism 10 </ b> A is provided on the upstream side of the T die 5 and at a relatively short distance to the T die 5. This distance is preferably 0 to 30 cm, more preferably 0 to 10 cm, although it depends on the viscosity of the molten resin and the type of additive. When the resin replacement mechanism 10A is installed at a position away from the T die 5, foreign matter is likely to stay in the vicinity of the wall surface in the flow path between the resin replacement mechanism 10A and the T die 5, which accumulates foreign matter in the lip port 5a. It is easy to cause. As a suitable means for arranging the resin replacement mechanism 10 </ b> A in the immediate vicinity of the T die 5, a feed block including the resin replacement mechanism 10 </ b> A is manufactured and connected to the upstream side of the T die 5.

  In the branch portion 15A, the branch paths 12A and 13A are divided in the X-axis direction, and then extend away from each other in the X-axis direction (see FIGS. 4 and 5). Referring to FIG. 5, in branching portion 15A, the extending direction of branching path 12A has a vector component in the direction of the arrow on the X axis, and the extending direction of branching path 13A has a vector component in the opposite direction. .

  The first rearrangement unit 16A is a part for arranging the branch paths 12A and 13A arranged in the X-axis direction so as to be separated in the Y-axis direction (see FIG. 6). In the first rearrangement section 16A, the branch paths 12A and 13A extend from the upstream side toward the downstream side so as to approach each other in the X axis direction and away from each other in the Y axis direction.

  The second rearrangement unit 17A is a part for making the positional relationship in the X-axis direction of the branch paths 12A and 13A opposite to that on the upstream side of the first rearrangement unit 16A (see FIG. 7). . In the second rearrangement portion 17A, the branch paths 12A and 13A extend from the upstream side toward the downstream side so as to be away from each other in the X-axis direction and closer to each other in the Y-axis direction.

  The junction 18A is a part for joining the branch paths 12A and 13A. Referring to FIG. 8, in the junction 18A, the extending direction of the branch path 12A has a vector component in the direction opposite to the arrow direction of the X axis, and the extending direction of the branch path 12B is in the direction of the arrow of the X axis. Has vector components.

  By providing the resin replacement mechanism 10A in the flow path 8A, the molten resin flowing near the wall surface of the flow path 8A on the upstream side of the resin replacement mechanism 10A and the molten resin flowing in the center of the flow path 8A are replaced. can do. As a result, as shown in FIG. 9, in the flow path on the downstream side of the resin replacement mechanism 10A, the molten resin that has a low possibility of containing foreign substances flows near the wall surface of the flow path, and may contain foreign substances. A relatively high molten resin flows through the center of the flow path.

  In FIG. 9, for ease of explanation, only the regions X at both ends in the X axis direction are colored at the entrance of the resin replacement mechanism 10A, and the regions Y at both ends in the Y axis direction are colored. Not. Actually, the molten resin that has passed near the wall surface of the flow path 8A exists over the entire inner peripheral surface of the flow path 8A. For this reason, the molten resin in the vicinity of the wall surface of the flow path 8A that is not colored in FIG. 9 reaches the T die 5 without being replaced by the resin replacement mechanism 10A. However, the portion formed from the molten resin is cut as an ear after the multilayer molded body 20 is molded. For this reason, even if an appearance defect or the like occurs in this portion, there is no problem.

  By performing the replacement of the molten resin as described above, it is difficult for foreign matters to adhere to the lip port 5a of the T die 5, and it becomes possible to stably manufacture a high-quality multilayer molded body. In particular, if foreign matter accumulates in the lip port 5a, defects such as defective appearance are likely to occur in the outermost layers 20A and 20B of the multilayer molded body 20, and therefore the resin replacement mechanism 10A is provided in the flow paths 8A and 8B for transferring the outermost layer molten resin. , 10B are effective in improving quality and yield.

  Note that the number of branch paths in the resin replacement mechanism 10A is not limited to two and may be three or more, but two is preferable from the viewpoint of manufacturing the mechanism. The cross-sectional shapes of the branch paths 12A and 13A are preferably rectangular from the viewpoint of effectively dividing the molten resin flowing in the vicinity of the wall surface of the flow path 8A and then joining again. A channel 19 shown in FIG. 10 is for connecting a channel having a circular cross-sectional shape and a rectangular channel. It is preferable to provide the flow paths 19 on the upstream side and the downstream side of the resin replacement mechanisms 10A and 10B, respectively.

<Method for producing multilayer film or multilayer sheet>
A method for producing a multilayer molded body (multilayer film or multilayer sheet) using the production apparatus 50 will be described. In the method according to the present embodiment, the molten resin is supplied from the extruders 1A, 1B, and 1C to the T die 5 through the flow paths 8A, 8B, and 8C, and the molten resin is extruded from the T die 5 to form the multilayer molded body 20. Forming the step.

  By introducing the molten resin into the resin replacement mechanism 10A provided in the flow path 8A, the molten resin flowing in the vicinity of the wall surface of the flow path 8A on the upstream side of the resin replacement mechanism 10A and the central portion of the flow path 8A are flowed. Replace the molten resin. More specifically, the molten resin is first flowed away from each other in the X-axis direction through the branch paths 12A and 13A, and then approached to each other. Then, after reversing the positional relationship in the X-axis direction of the molten resins flowing in the branch paths 12A and 13A, these molten resins are flowed so as to approach each other in the X-axis direction and merged. The molten resin that has passed through the resin replacement mechanism 10 </ b> A is supplied to the T die 5 as it is. The flow path 8A and the resin replacement mechanism 10B provided in the flow path 8A are the same as described above.

  The thermoplastic resin used for the raw material of the multilayer molded body is not particularly limited. For example, ethylene homopolymer, propylene homopolymer, butene homopolymer, hexene homopolymer, cyclic olefin homopolymer, ethylene-propylene Copolymer, ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-1-octene copolymer, propylene-1-butene copolymer, propylene-1-hexene copolymer, propylene -1-octene copolymer, ethylene-propylene-1-butene copolymer, ethylene-propylene-1-hexene copolymer, propylene-ethylene block copolymer, ethylene-propylene-1-octene copolymer, ethylene -Styrene copolymer, propylene-styrene copolymer, ethylene-vinylcyclohexane copolymer Polyolefin resins such as propylene-vinylcyclohexane copolymer and ethylene-methyl methacrylate copolymer; acrylic resins such as polymethyl methacrylate and ethylene-ethyl acrylate copolymer; butadiene-styrene copolymer, acrylonitrile-styrene Styrene resins such as copolymers, polystyrene, styrene-butadiene-styrene copolymers, styrene-isoprene-styrene copolymers, styrene-acrylic acid copolymers; vinyl chloride resins, polyvinyl fluoride, polyvinylidene fluoride, etc. Vinyl fluoride resins; amide resins such as 6-nylon, 6,6-nylon, 12-nylon; saturated ester resins such as polyethylene terephthalate and polybutylene terephthalate; polycarbonate, polyphenyleneoxy Id, polyacetal, polyphenylene sulfide, silicone resin, thermoplastic urethane resins, polyether ether ketone, polyetherimide, polyacrylonitrile, cellulose derivatives, polysulfone, polyether sulfone, and various thermoplastic elastomers. These cross-linked products and modified products may be used as raw materials. You may use the said material individually by 1 type or in combination of 2 or more types. Additives may be appropriately contained in the raw material resin.

  Specific examples of polyolefin resins include polyethylene resins such as low density polyethylene, linear polyethylene (ethylene / α-olefin copolymer) and high density polyethylene, polypropylene, propylene / ethylene copolymer, propylene / 1. -Polypropylene resin such as butene copolymer, ethylene / cyclic olefin copolymer, ethylene / vinylcyclohexane copolymer, poly (4-methylpentene-1), poly (butene-1), ethylene / methyl acrylate copolymer Examples thereof include a polymer, an ethylene / methyl methacrylate copolymer, an ethylene / ethyl acrylate copolymer, and an ethylene / vinyl acetate copolymer.

  By appropriately selecting raw materials to be used from the above resins and supplying them to the extruders 1A, 1B and 1C, a multilayer film having a thickness of about 5 to 500 μm or a multilayer sheet having a thickness of about 500 μm to 50 mm is usually produced. . According to the manufacturing method described above, the molten resin is passed through the resin replacement mechanisms 10A and 10B to replace the resin, thereby making it difficult for foreign matter to adhere to the lip port 5a of the T die 5 and producing a high-quality multilayer molded body. It can be manufactured stably.

  The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, the case where the resin replacement mechanism is provided in both the flow paths 8A and 8B for transferring the molten resin forming the outermost layers 20A and 20B has been described. For example, the outermost layer 20A has defects due to foreign matters. However, if there is no particular problem due to the nature of the product, a resin replacement mechanism may be provided only in the flow path 8B for the outermost layer 20B. In some cases, a resin replacement mechanism may be provided in the flow path 8C for the intermediate layer 20C of the multilayer molded body 20.

  Furthermore, in the said embodiment, although the case where T die was provided as a die | dye was mentioned, it is not limited to T die, You may provide a cyclic | annular die (crosshead die).

  The apparatus and method according to the present invention may be applied to produce a multilayer molded body having two layers or four or more layers. Furthermore, as shown in FIG. 11, the present invention may be applied to produce a single layer film or sheet (single layer molded product). A manufacturing apparatus 60 shown in FIG. 11 is for manufacturing a film or a sheet, and includes an extruder 1A, a T die 6, a flow path 8 that communicates the extruder 1 and the T die 6, and a resin replacement mechanism. 10. The resin replacement mechanism 10 has the same configuration as the resin replacement mechanism 10A described above. According to the manufacturing apparatus 60 and the method of manufacturing a film or sheet using the same, the resin replacement mechanism 10 replaces the molten resin in the flow path 8, so that it is difficult for foreign matter to adhere to the lip port 6 a of the T die 6. High-quality single-layer molded products can be stably produced.

1A, 1B, 1C ... Extruder, 5, 6 ... Die, 8, 8A, 8B, 8C ... Flow path, 10, 10A, 10B ... Resin replacement mechanism, 12A, 13A ... Branch path, 12B, 13B ... Branch path, DESCRIPTION OF SYMBOLS 20 ... Multilayer molded object (multilayer film or multilayer sheet), 20A, 20B ... Outermost layer of multilayer molded object, 50 ... Manufacturing apparatus of multilayer molded object, 60 ... Manufacturing apparatus of single layer molded object.

Claims (4)

An apparatus for producing a film or sheet,
An extruder for transferring the molten resin;
A die for forming the molten resin from the extruder into a film or sheet; and
A flow path communicating the extruder and the die;
Resin replacement that is provided in the middle of the flow path, and has a configuration in which the plurality of branch paths merge again after the flow path is divided into a plurality of branch paths, and changes the position of the molten resin flowing in the flow path Mechanism,
With
When setting the XYZ orthogonal coordinate system with the thickness direction of the molten resin extruded from the die as the X-axis direction and the width direction as the Y-axis direction,
The resin replacement mechanism has at least first and second branch paths that separate the molten resin supplied from the flow path in the X-axis direction at a position where the molten resin is transferred in the Z direction toward the die. And
The first and second branch paths move away from each other in the X-axis direction on the upstream side, and then extend so as to approach each other, and the positional relationship in the X-axis direction is reversed. Manufacturing equipment. An apparatus for producing a multilayer film or a multilayer sheet,
A plurality of extruders for respectively transporting the molten resin;
A die for forming the molten resin from the plurality of extruders into a film or sheet; and
A plurality of flow paths respectively communicating the plurality of extruders and the die;
Among the plurality of flow paths, at least the multilayer film or the multilayer sheet is provided in the middle of a flow path for transferring a molten resin forming the outermost layer, and the flow paths are divided into a plurality of branch paths, and then the plurality of branches A resin replacement mechanism for changing the position of the molten resin flowing through the flow path, having a configuration in which the paths merge again;
With
When setting the XYZ orthogonal coordinate system with the thickness direction of the molten resin extruded from the die as the X-axis direction and the width direction as the Y-axis direction,
The resin replacement mechanism has at least first and second branch paths that separate the molten resin supplied from the flow path in the X-axis direction at a position where the molten resin is transferred in the Z direction toward the die. And
The first and second branch paths move away from each other in the X-axis direction on the upstream side, and then extend so as to approach each other, and the positional relationship in the X-axis direction is reversed. Manufacturing equipment. A method for producing a film or sheet,
A step of supplying the molten resin from the extruder to the die through a flow path, and a step of extruding the molten resin from the die to obtain a film or sheet,
When setting the XYZ orthogonal coordinate system with the thickness direction of the molten resin extruded from the die as the X-axis direction and the width direction as the Y-axis direction,
In the middle of the flow path, after being divided into a plurality of branch paths, the plurality of branch paths become a single flow path again to transfer the molten resin in the Z direction toward the die and flow through the flow path. A resin replacement mechanism that changes the position of the molten resin is provided,
By introducing the molten resin into at least the first and second branch paths of the resin replacement mechanism, the molten resin in the first and second branch paths is moved away from each other in the X-axis direction on the upstream side, and thereafter The manufacturing method of flowing so that it may mutually approach, the positional relationship of a X-axis direction may reverse, and it may mutually approach in the X-axis direction and may merge on the downstream side. A method for producing a multilayer film or a multilayer sheet,
A step of supplying molten resin from a plurality of extruders to a die through a plurality of flow paths, respectively, and a step of extruding the molten resin from the die to obtain a multilayer film or a multilayer sheet,
When setting the XYZ orthogonal coordinate system with the thickness direction of the molten resin extruded from the die as the X-axis direction and the width direction as the Y-axis direction,
Among the plurality of flow paths, at least in the middle of the flow path for transferring the molten resin forming the outermost layer of the multilayer film or the multilayer sheet, the plurality of branch paths are once again divided into a plurality of branch paths. A resin replacement mechanism is provided that moves the molten resin in the Z direction toward the die, becoming a flow path, and changes the position of the molten resin flowing through the flow path,
By introducing the molten resin into at least the first and second branch paths of the resin replacement mechanism, the molten resin in the first and second branch paths is moved away from each other in the X-axis direction on the upstream side, and thereafter The manufacturing method of flowing so that it may mutually approach, the positional relationship of a X-axis direction may reverse, and it may mutually approach in the X-axis direction and may merge on the downstream side.