JP4720409B2 - Laminate sheet manufacturing apparatus and method - Google Patents

Description

  The present invention relates to an apparatus and a method for producing a laminated sheet suitable for producing a multilayer film.

  A plurality of types (for example, two types) of molten materials (melted resins) are supplied to the respective manifolds that receive the respective molten materials, and the molten materials are discharged from each manifold through a plurality of pores or a plurality of slits. Forming a laminar flow of molten material, and merging the laminar flows of a plurality of molten materials to form a multilayer molten material sheet, wherein the sheet is oriented in a direction orthogonal to the laminating direction of each layer of molten material (sheet A method of forming a laminated sheet by discharging from a slit-shaped base extending in the width direction is known (for example, Patent Document 1, Patent Document 2, and Patent Document 3). The laminated sheet discharged from the die is used as it is or after that, after being subjected to post-treatment such as stretching.

  A typical example of this laminated sheet manufacturing apparatus is shown in FIG. In FIG. 1, the laminated sheet manufacturing apparatus is supplied by a molten resin introduction tube 1 to which one molten resin A is supplied, a molten resin introduction tube 2 to which the other molten resin B is supplied, and a molten resin introduction tube 1. A multilayer feed block 3 that forms a laminated flow composed of a molten resin A and a molten resin B supplied by a molten resin introduction pipe 2, a conduit 4 through which the formed laminated flow flows, and the width and thickness of the laminated flow supplied by the conduit 4 Is adjusted to a predetermined value, and the adjusted laminated flow is discharged to form a laminated sheet in which the molten resin A and the molten resin B are alternately laminated, and the laminated sheet 6 discharged from the die 5 It consists of a casting drum 7 that cools and solidifies. The laminated sheet solidified by the casting drum 7 is usually called an unstretched film 8. The unstretched film 8 is usually sent to a stretching process (not shown) as indicated by an arrow NS and stretched in one direction or two directions to form a multilayer film.

  The multi-layer feed block 3 has passed through a manifold that is coupled to the molten resin introduction pipe 1, a manifold that is coupled to the molten resin introduction pipe 2, and a plurality of slits arranged at predetermined intervals. It has a confluence | merging part which merges the flow of each molten resin. The plurality of slits are divided into two groups, the plurality of slits in one group open to the outlet of the manifold coupled to the molten resin introduction pipe 1, and the plurality of slits in the other group are introduced with the molten resin Opening to the outlet of the manifold coupled to the tube 2. The outlet of the junction is communicated with the conduit 4.

  The basic configuration of the laminated sheet manufacturing apparatus of the present invention is substantially the same as the basic configuration of the laminated sheet manufacturing apparatus shown in FIG. 1, but the laminated sheet manufacturing apparatus of the present invention is used there. Characterized by the structure of the multilayer feed block.

  An example of a multilayer feed block used in a conventional laminated sheet manufacturing apparatus is shown in FIG. In FIG. 11, the space formed in the multilayer feed block is shown.

  In FIG. 11, a multilayer feed block 101 is provided with a resin introduction path 102 for introducing molten resin A into the block 101 and a resin introduction path 103 for introducing molten resin B into the block. Inside the multilayer feed block 101, a manifold 104 to which the resin introduction path 102 is coupled and a manifold 105 to which the resin introduction path 103 is coupled are provided. The manifold 104 guides the flow of the molten resin A introduced from the resin introduction path 102 over the entire width of the multilayer feed block 101 in the longitudinal direction (X-axis direction shown in FIG. 11). The manifold 105 guides the flow of the molten resin B introduced from the resin introduction path 103 over the entire width of the multilayer feed block 101 in the longitudinal direction (X-axis direction shown in FIG. 11).

  Furthermore, a large number of slits arranged at a predetermined interval 110 are provided in the multilayer feed block 101. The large number of slits includes a slit group including a plurality of slits 108 and a slit group including a plurality of slits 109. The slits 108 and the slits 109 are alternately arranged with an interval 110. The entrance of each slit 108 is coupled to the exit of the pore 106, and the entrance of the pore 106 is coupled to the manifold 104. The entrance of each slit 109 is coupled to the exit of the pore 107, and the entrance of the pore 107 is coupled to the manifold 105. That is, a slit group including a plurality of slits 108 communicates with the manifold 104 via the pores 106, and a slit group including the plurality of slits 109 communicates with the manifold 105 via the pores 107.

  Furthermore, a merging portion (not shown) coupled to the slits 108 and the outlets of the slits 109 is provided inside the multilayer feed block 101. In this merging portion, a flow of laminated molten resin in which the flow of molten resin A flowing out from the outlet of each slit 108 and the flow of molten resin B flowing out of the outlet of each slit 109 are alternately laminated is formed.

  The slits 108 and 109 have, for example, an interval (corresponding to the interval 110) in the longitudinal direction (X-axis direction shown in FIG. 11) of the rectangular parallelepiped (or plate) and the width direction of the rectangular parallelepiped (Y-axis direction shown in FIG. 11). ) And is prepared by a comb-like rectangular parallelepiped (slit plate) in which a large number of slits are formed so as not to reach the upper surface of the rectangular parallelepiped from the lower surface of the rectangular parallelepiped to the upper surface direction (Z-axis direction shown in FIG. 11). The

  In the multilayer feed block 101, the molten resin A flows from the manifold 104 into the pores 106 and then flows into the slits 108. On the other hand, the molten resin B flows from the manifold 105 into the pore 107 and then into the slit 109.

  The structure of the conventional multilayer feed block 101 described above is also shown in Patent Document 2. In the conventional multilayer feed block 101, the slits 108 and 109 formed on the slit plate are located at both ends of the slit in the slit width direction (Y-axis direction shown in FIG. 11) in order to facilitate processing and reduce processing costs. The slit lengths (the lengths of the slits in the Z-axis direction shown in FIG. 11) are the same.

  Therefore, when molten resin is introduced into the corresponding slit 108 (or 109) from each pore 106 (or 107) on the side surface of the slit, as shown in FIG. 12, it reaches the outlet SO of the slit 108 (or 109). There is a difference in length between the flow path length L1 and the flow path length L2 of the resin flow path in the slit 108 (or 109) closer to the pore 106 (or 107) and far from the pore. To do.

  Therefore, the flow rate of the molten resin at the outlet SO of the slit 108 (or 109) is large at the slit outlet Son on the side close to the pore 106 (or 107), and the slit outlet on the side far from the pore 106 (or 107). Decrease toward Sof. That is, the flow rate of the molten resin at the slit outlet Son on the side closer to the pore 106 (or 107) is larger than the flow rate of the molten resin at the slit outlet Sof on the side farther from the pore 106 (or 107).

  In such a state that there is a difference in the flow rate of the molten resin in the width direction of the slit outlet SO (the Y-axis direction shown in FIG. 12), the flow of the molten resin flowing out from each slit is merged at the merging portion. A laminar flow is formed. In this state, the laminated flow (X-axis direction shown in FIG. 11) is the thickness direction of the multilayer film to be produced, in other words, the slit width direction (Y-axis direction shown in FIG. 11) is produced. The multilayer film is formed by being extruded from the die 5 so as to be in the width direction of the multilayer film to be formed. The thickness of each layer of the multilayer film thus formed is not constant in the width direction. That is, a multilayer film in which the thickness of each layer is uniform in the width direction cannot be obtained.

  Further, in the conventional multilayer feed block 101, there is a possibility that the molten resin may stay in the upper part of the slit far from the pore 106 (or 107). If the molten resin stays, it causes a problem of thermal degradation of the resin.

  In FIG. 12, the series of the manifold 104, the pores 106, and the slits 108 that are involved in the flow of the molten resin A and the series of the manifold 105, the pores 107, and the slits 109 that are involved in the flow of the molten resin B are the same direction. However, as can be seen from FIG. 11, one series is actually in a horizontally inverted relationship with respect to the other series.

  In the multilayer feed block disclosed in Patent Document 3, the upper part of the slit is formed in an arc shape. This seems to reduce the stagnation of the molten resin in the upper corner of the slit. However, the problem of non-uniformity of the thickness of each layer in the width direction of the multilayer film due to the difference in the flow path length of the molten resin in the slit described above has not been solved.

In addition, since the slit internal shape is partially formed in an arc shape, especially when the slit gap is small, it is difficult to process the slit, and the structure that requires the pore, There is a problem that the production cost becomes high. Further, since the upper part of the slit has an arcuate concave shape, there is a problem that maintenance such as cleaning becomes complicated.
Japanese Patent Publication No. 50-6860 JP 2003-112355 A JP 2003-251675 A

  A general object of the present invention is to provide a laminated sheet manufacturing apparatus and a manufacturing method capable of easily manufacturing a laminated sheet having a thickness of each layer as a target value or a design value.

  One of the objects of the present invention is to provide a laminated sheet manufacturing apparatus and a manufacturing method capable of manufacturing a laminated sheet having a substantially uniform thickness in the width direction of each layer of the laminated sheet.

  Another object of the present invention is to provide a laminated sheet manufacturing apparatus and a manufacturing method capable of preventing the thermal degradation of the molten resin and capable of manufacturing the laminated sheet over a long period of time without the molten resin retaining portion in the slit. It is to provide a method.

  Still another object of the present invention is to provide an apparatus and a method for manufacturing a laminated sheet that can be easily processed into a slit and can reduce the manufacturing cost of the slit.

  Still another object of the present invention is to provide a laminated sheet manufacturing apparatus and manufacturing method capable of facilitating maintenance such as cleaning of slits.

  In order to achieve the above object, the laminated sheet manufacturing apparatus of the present invention has the following configuration.

That is, a laminated sheet manufacturing apparatus in which a plurality of types of molten materials are stacked in a plurality of layers larger than the number of the types, and a plurality of manifolds that respectively supply the molten materials, and between the manifolds And a slit plate formed in the slit plate, communicated with any one of the manifolds, and passes the molten material supplied into the manifolds from the manifolds corresponding to the respective layers. A plurality of slits arranged at predetermined intervals, and a joining portion that joins the molten material that has passed through each slit so as to form the stack, and is disposed so as to sandwich the slit plate. Two side plates forming an outline, and each slit formed in the slit plate The outlet of one manifold is closed by the side wall of the side plate, and the inlet is formed so as to open directly to the outlet of the other manifold, and the slits flow upward. An apparatus for producing a laminated sheet is provided that has a road sloping portion and is slanted in a direction toward the downstream as it is separated from the manifold.
Further, for each of the slits communicating with any one of at least two manifolds of the plurality of manifolds, in the width direction of the slit in the flow path of the molten material from the outlet of the manifold to the outlet of the slit, The ratio L1 / L2 between the flow path length L1 of the first flow path section passing through the side closer to the manifold and the flow path length L2 of the second flow path section passing through the side far from the manifold is 0.5 or more. A laminated sheet manufacturing apparatus is provided.
Further, there is provided a laminated sheet manufacturing apparatus in which a plurality of types of molten materials are stacked in a plurality of layers larger than the number of the types, and a plurality of manifolds that respectively supply the respective molten materials, and between the manifolds A slit plate located in each of the manifolds , communicated with any one of the manifolds, and allows the molten material supplied into the manifolds to pass through the manifolds corresponding to the layers. A plurality of slits arranged at predetermined intervals, and a joining portion that joins the molten material that has passed through each slit so as to form the stack, and is arranged so as to sandwich the slit plate. Each of the slits formed in the slit plate is formed on the side of the manifold. The outlet of one manifold is closed by the side wall of the side plate, and an inlet is formed so as to open directly to the outlet of the other manifold. Each of the plurality of slits communicating with one of at least two manifolds of the plurality of manifolds, wherein the outlet of the manifold is inclined. In the flow path of the molten material from the slit to the outlet of the slit, in the width direction of the slit, the flow path length L1 of the first flow path section passing through the side close to the manifold and the second passing through the side far from the manifold. An apparatus for manufacturing a laminated sheet is provided in which the ratio L1 / L2 of the flow path portion to the flow path length L2 is 0.5 or more.

  Moreover, according to the preferable form of this invention, the said ratio L1 / L2 is 0.55 or more, The manufacturing apparatus of the lamination sheet characterized by the above-mentioned is provided.

  According to a preferred aspect of the present invention, the upstream portion of the second flow path portion is formed by an inclined flow path portion that is inclined in a direction toward the downstream as the distance from the manifold is increased. An apparatus for manufacturing a laminated sheet is provided.

  Moreover, according to the preferable form of this invention, the said inclined flow path part is formed with the inclined flow path part inclined linearly, The manufacturing apparatus of the laminated sheet characterized by the above-mentioned is provided. This facilitates the design of the slit having the ratio L1 / L2 of 0.5 or more, facilitates the production of the slit, and reduces the retention of molten resin in the slit, or substantially It can be lost.

  Moreover, according to the preferable form of this invention, the slit width in the exit of the said slit is 10 mm or more and 200 mm or less, The manufacturing apparatus of the lamination sheet characterized by the above-mentioned is provided. When the slit width is less than 10 mm, the strength of surrounding members forming the slit may be insufficient. When the slit width exceeds 200 mm, it may be difficult to accurately process the slit gap.

  Moreover, according to the preferable form of this invention, the slit width in the exit of the said slit is 20 mm or more and 100 mm or less, The manufacturing apparatus of the lamination sheet characterized by the above-mentioned is provided.

  Moreover, according to the preferable form of this invention, the slit clearance gap of the said slit is 0.1 mm or more and 5 mm or less, The manufacturing apparatus of the lamination sheet characterized by the above-mentioned is provided. If the slit gap is less than 0.1 mm, it may be difficult to control the processing apparatus when processing the slit. When the slit gap exceeds 5 mm, in a feed block having a large number of layers to be laminated, the feed block may become excessively large in the longitudinal direction (resin laminating direction), and the pressure of the molten resin flowing through each slit Loss is reduced, and it may be difficult to make the flow rate of the molten resin flowing through each slit uniform.

  According to a preferred aspect of the present invention, the flow path length LC of the central flow path portion passing through the center in the width direction of the slit in the flow path of the slit is 20 mm or more and 200 mm or less. An apparatus for manufacturing a laminated sheet is provided. When the flow path length LC of the central flow path portion is less than 20 mm, the pressure loss of the molten resin flowing through each slit becomes small, and it may be difficult to equalize the flow rate of the molten resin flowing through each slit. When the flow path length LC of the central flow path section exceeds 200 mm, the pressure loss becomes too large, and molten resin leaks or the slit may be deformed when the apparatus is used repeatedly.

  Moreover, according to the preferable form of this invention, the flow path length LC of the said center flow path part is 30 mm or more and 100 mm or less, The manufacturing apparatus of the lamination sheet characterized by the above-mentioned is provided.

  Moreover, according to the preferable form of this invention, the number of these slits is 10-1,000, The laminated sheet manufacturing apparatus characterized by the above-mentioned is provided.

  Moreover, according to the preferable form of this invention, the number of these slits is 10-400, The laminated sheet manufacturing apparatus characterized by the above-mentioned is provided.

Further, according to another aspect of the present invention, there is provided a method for manufacturing a laminated sheet in which a plurality of types of molten materials are stacked in a plurality of layers larger than the number of the types, and each of the molten materials is a plurality of layers. Via a manifold, each formed on a slit plate located between the manifolds, communicated with any one of the manifolds, and supplied to a plurality of slits arranged at predetermined intervals corresponding to the layers, When joining the molten material supplied to the slit so as to form the laminated layer, two side plates that are arranged so as to sandwich the slit plate are used to form the outline of the manifold. As each slit to be formed, the outlet of one of the manifolds is closed by the side wall of the side plate, and the other For the outlet of the manifold, use one having an inlet formed so as to open directly, and as each of the slits, there is a channel inclined portion at the top, and in the direction toward the downstream as it moves away from the manifold A method for producing a laminated sheet using an inclined one is provided.
Further, according to a preferred embodiment of the present invention, for each of the slits communicating with any one of at least two manifolds of the plurality of manifolds, in the flow path of the molten material from the outlet of the manifold to the outlet of the slit. In the width direction of the slit, the ratio L1 / the flow path length L1 of the first flow path section passing through the side closer to the manifold and the flow path length L2 of the second flow path section passing through the side far from the manifold. A method for producing a laminated sheet in which L2 is 0.5 or more is provided.
Further, according to another aspect of the present invention, there is provided a method for manufacturing a laminated sheet in which a plurality of types of molten materials are stacked in a plurality of layers larger than the number of the types, and each of the molten materials is a plurality of layers. Via a manifold, each formed on a slit plate located between the manifolds, communicated with any one of the manifolds, and supplied to a plurality of slits arranged at predetermined intervals corresponding to the layers, When joining the molten material supplied to the slit so as to form the laminated layer, two side plates that are arranged so as to sandwich the slit plate are used to form the outline of the manifold. As each slit to be formed, the outlet of one of the manifolds is closed by the side wall of the side plate, and the other Used as the inlet is formed so as to open directly against the outlet of the manifold, also, each slit has a flow path inclined portion at the top, as the distance from the manifold, tilt toward the downstream and it is, also, as the respective slits communicating with one of at least two manifold of said plurality of manifold, in the flow path of the molten material from the outlet of the manifold to the outlet of said slit, the width of the slit In the direction, the ratio L1 / L2 of the flow path length L1 of the first flow path section passing through the side closer to the manifold and the flow path length L2 of the second flow path section passing through the side far from the manifold is 0. There is provided a method for producing a laminated sheet characterized by using a slit of 5 or more.

  In the laminated sheet produced by the present invention, a plurality of types of molten materials (for example, a molten resin or a molten polymer) are laminated in a plurality of layers larger than the number of the types, and then the molten material is solidified. It is formed. In the laminated sheet produced according to the present invention, the thickness of each layer is substantially uniform in the width direction of the sheet. That is, the stacking accuracy of each layer in the sheet width direction is good.

  That is, according to the laminated sheet manufacturing apparatus of the present invention, it is possible to easily manufacture a laminated sheet with the thickness of each layer as a target value or a design value.

  In the laminated sheet manufacturing apparatus according to the present invention, by setting the ratio L1 / L2 of the flow length of the molten material in each slit to 0.5 or more, different positions (differences in the slit of the molten material passing through the slit) Variation in pressure loss or flow rate in the flow path) is suppressed. As a result, a variation in the thickness of each layer in the slit width direction at the exit of the slit is suppressed to a small size, and a laminated sheet having a uniform laminated structure is obtained. That is, a laminated sheet having good lamination accuracy and a laminated sheet having good homogeneity in the width direction of the sheet can be obtained.

  In the laminated sheet manufacturing apparatus according to the present invention, it is not necessary to provide the pores provided between the manifold and the slit of the conventional laminated sheet manufacturing apparatus, and each slit directly corresponds to the molten material from each manifold. Can be introduced. As a result, the overall configuration and processing of the apparatus can be simplified, and the apparatus manufacturing cost can be reduced. In addition, since the manifold forming member can be arranged directly on both sides of the slit forming member, both sides of the slit can be opened if the manifold forming member is removed, and maintenance work such as cleaning of the slit is performed. Can be performed very easily.

  By setting the upstream part of the second flow path part in the slit as an inclined part, in particular, as a linear inclined part that can be processed easily and inexpensively, the retention of the molten material in the slit is prevented, and the heat of the resin Deterioration is prevented. As a result, it is possible to manufacture a laminated sheet for a long time.

  2 to 6 are views relating to the multilayer feed block 11 used in an embodiment of the laminated sheet manufacturing apparatus of the present invention. 2 is an exploded perspective view of the multilayer feed block 11, and FIG. 3 is a front view of the slit plate 20 and the junction / discharge path forming member 20a of FIG.

  2 and 3, the multilayer feed block 11 includes a side plate 21, a side plate 22, and a slit plate 20 sandwiched between the side plate 21 and the side plate 22. The slit plate 20 has a junction / discharge path forming member 20a coupled to the lower part thereof.

  The side plate 21 is provided with a resin A-side manifold 14 extending in the longitudinal direction (X-axis direction shown in FIG. 2), and molten resin A (molten resin A) is supplied into the manifold 14. The resin introduction path 12 is coupled. The side plate 22 is provided with a resin B-side manifold 15 extending in the longitudinal direction (X-axis direction shown in FIG. 2), and molten resin B (molten resin B) is supplied into the manifold 15 into the manifold 15. The resin introduction path 13 is coupled.

  The slit plate 20 is provided with a large number of slits 16 and a large number of slits 17 via partition walls 20b in the longitudinal direction (X-axis direction shown in FIG. 3). The slits 16 and the slits 17 are alternately located via the partition walls 20b. The slits 16 and 17 are engraved in the slit plate 20 with a predetermined length from the bottom surface of the slit plate 20 to the upper surface direction (Z-axis direction shown in FIG. 3). Both side surfaces of each slit 16, 17 are open to both side surfaces of the slit plate 20.

  In the state where the side plate 21, the slit plate 20 and the side plate 22 are assembled, the inlet of each slit 16 opens directly to the outlet of the manifold 14, and the inlet of each slit 17 opens directly to the outlet of the manifold 15. Is done. Further, the openings on the side surfaces other than the entrance of each slit 16 are closed by the wall surfaces of the side plates 21 and 22, and the openings on the side surfaces other than the entrance of each slit 17 are closed by the wall surfaces of the side plates 21 and 22. The inlets of the slits 16 and 17 are directly open to the outlets of the manifolds 14 and 15, and the pores and pore forming members in the conventional multilayer feed block are interposed between the outlets of the manifolds and the inlets of the slits. Not done. In this way, each slit 16 communicates directly with the manifold 14 and each slit 17 communicates directly with the manifold 15.

  The resin introduction path 12 is coupled to the resin introduction pipe 1 shown in FIG. 1 and receives supply of the molten resin A from the resin introduction pipe 1. The molten resin A supplied from the resin introduction path 12 into the manifold 14 flows in the manifold 14 in the longitudinal direction of the manifold 14 (X-axis direction shown in FIG. 2) and fills the manifold 14. The molten resin A in the manifold 14 flows into the slits 16 from the entrances of the slits 16 opened in the manifold 14, flows down in the slits 16, and flows out from the exits of the slits 16 to the junction 18. To do.

  The resin introduction path 13 is coupled to the resin introduction pipe 2 shown in FIG. 1 and receives supply of the molten resin B from the resin introduction pipe 2. The molten resin B supplied from the resin introduction path 13 into the manifold 15 flows in the manifold 15 in the longitudinal direction of the manifold 15 (X-axis direction shown in FIG. 2) and fills the manifold 15. The molten resin B in the manifold 15 flows into the slits 17 from the entrances of the slits 17 opened in the manifold 15, flows down in the slits 17, and flows out from the exits of the slits 17 to the junction 18. To do.

  Each sheet-like flow of molten resin A having a cross-sectional shape following the shape of the cross-section (surface including the X-axis and Y-axis shown in FIG. 2) of each slit 16, 17 that has flowed out to the merging portion 18 and the molten resin Each sheet-like flow of B is alternately laminated at the junction 18 to form a laminated flow. This laminated flow flows down the discharge path 19. The lamination direction of the molten resin A and the molten resin B in the laminated flow flowing down the discharge path 19 coincides with the thickness direction of the produced laminated sheet.

  The laminated flow flowing down the discharge path 19 is introduced into the base 5 via the conduit 4 shown in FIG. The laminated flow is widened in a predetermined direction (a direction orthogonal to the lamination direction of the molten resin A and the molten resin B) in the die 5 and discharged from the die 5 as a laminated sheet 6, and the discharged laminated sheet 6 is It is cooled and solidified on the surface of the casting drum 7, sent to the next process (for example, stretching process) as an unstretched film 8, and formed into a multilayer film (not shown).

  4 and 5, the relationship between the slits 16 and the slits 17 located adjacent to each other in the longitudinal direction of the slit plate 20 via the partition wall 20b is shown in an enlarged manner.

  On the upper side of each slit 16, 17, that is, on the upstream part of the second flow path part to be described later, an inclined part 23 that is inclined in the direction toward the downstream of the flow of the molten resin as it is away from the corresponding manifold 14, 15, 24 is formed. In this embodiment, the inclined portions 23 and 24 are formed as inclined portions extending linearly. As shown in FIGS. 4 and 5, the inclined portions 23 and 24 are inclined in directions opposite to each other.

  In the multilayer feed block 11, the molten resin A flows from the manifold 14 into the slits 16 having the inclined portions 23, as indicated by arrows 14a in FIG. Further, the molten resin B flows from the manifold 15 into the slits 17 having the inclined portions 24 as indicated by arrows 15a in FIG.

  By using the inclined portion 23, a flow path of the molten resin A is formed in which the upper portion of the slit 16 is formed only in communication with the manifold 14, and by using the inclined portion 24, the upper portion of the slit 17 is A flow path of the molten resin B formed so as to communicate only with the manifold 15 is constructed.

  In this embodiment, in each slit 16 forming one slit group involving the molten resin A, as shown in FIG. 6, from the outlet of the corresponding manifold 14 (inlet of the slit 16) to the outlet of the slit 16. With respect to the slit width direction (the Y-axis direction shown in FIG. 6), the flow length L1 of the first flow path portion 25 passing through the side closer to the manifold 14 and the second flow passing through the side far from the manifold 14 The ratio L1 / L2 with the flow path length L2 of the path portion 26 is set to 0.5 or more, preferably 0.55 or more.

  The same relationship as shown in FIG. 6 is set for each slit 17 forming the other slit group in which the molten resin B is involved. Although illustration of this relationship is omitted, this relationship is obtained by horizontally inverting the illustration of FIG.

  The size of each slit 16 and 17 and the shape of the inclined portion are determined so as to satisfy this relationship.

  Using the multilayer feed block 11 shown in FIG. 3, a biaxially stretched multilayer film was produced by the laminated sheet producing apparatus shown in FIG. 1, and the effects of the present invention were confirmed. Specific examples of confirmation of this effect are shown in the following Example 1 and Comparative Example 1.

FIG. 7 shows the size (unit: mm) of the main part of the manifold 14 (15) and the slit 16 (17) in the multilayer feed block 11 used in the test. FIG. 8 shows the distribution of the lamination ratio of the resin A and the resin B in the width direction of the manufactured multilayer film (Example 1). The horizontal axis of the graph of FIG. 8 is the width direction position WP, and the vertical axis is the stacking ratio LR (%). The slit gap of the slit 16 through which the resin A passes is 0.7 mm, and the slit gap of the slit 17 through which the resin B passes is 0.55 mm.
(Comparative Example 1)
FIG. 9 shows the size (unit: mm) of the main part of the manifold 104 (105) and the slit 108 (109) in the multilayer feed block used for the test with the conventional structure performed for comparison. A pore 106 (107) exists between the manifold 104 (105) and the slit 108 (109). FIG. 10 shows the distribution of the lamination ratio of resin A and resin B in the width direction of the produced multilayer film (Comparative Example 1). The horizontal axis of the graph of FIG. 10 is the width direction position WP, and the vertical axis is the stacking ratio LR (%). The slit gap of the slit 108 through which the resin A passes is 0.7 mm, and the slit gap of the slit 109 through which the resin B passes is 0.55 mm.

  The flow path length L1 of the first flow path section and the flow path length L2 of the second flow path section in the slit 16 (17) are defined as shown in FIG. 6 and FIG. That is, a circle whose diameter (radius = r) is 1/10 of the slit inlet length H is rolled along the inner wall surface of the slit of the first flow path section that passes from the manifold outlet to the side closer to the manifold. The length of the movement locus at the center of the circle is defined as the flow path length L1 of the first flow path section. Similarly, the length of the movement locus at the center of the circle when the same circle is rolled along the inner wall surface of the slit of the second flow path section passing through the side far from the manifold is set as the second flow path. The flow path length L2 of the part is assumed.

  In Example 1 and Comparative Example 1, as shown in FIGS. 7 and 9, since the entrance length of the slit is 7 mm, the diameter of the rolled circle is 0.7 mm and the radius is 0.35 mm. is there. In Example 1 shown in FIG. 7, L1 was 28.55 mm and L2 was 47.70 mm. Therefore, L1 / L2 is 0.598 (about 0.6). Moreover, L1 in the comparative example 1 shown in FIG. 9 was 23.55 mm, and L2 was 53.30 mm. Therefore, L1 / L2 is 0.442.

  The lamination ratio R (%) of the resin A and the resin B in the film width direction is a ratio of the resin A (polyethylene terephthalate: PET) and the resin B at each position WP in the film width direction as described below. Was determined by That is, about 10 mg each was sampled about the obtained film in the position of equal intervals in the width direction from the center position (width direction position WP = 3 in FIG. 8, FIG. 10) of the film width direction. This was charged into an aluminum tray and heated at a rate of 20 ° C./minute from room temperature to 300 ° C. using a differential scanning calorimeter DSC “RDC220” manufactured by Seiko Electronics Industry Co., Ltd. mJ / mg). Then, the PET ratio at each position in the width direction was calculated from the following formula (II).

PET ratio (%) = (X / Y) × 100. . . . . . . . . . (II)
X: Heat of fusion of laminated film (mJ / mg)
Y: heat of fusion of PET film (41.9 mJ / mg)
The graph showing the distribution of the stacking ratio in Example 1 in FIG. 8 is created based on the measurement data shown in Table 1. The stacking ratio unevenness in Example 1 was ± 6%.

  The graph showing the distribution of the stacking ratio in Comparative Example 1 in FIG. 10 is created based on the measurement data shown in Table 2. The uneven lamination ratio in Comparative Example 1 was ± 14%.

  As can be seen from FIGS. 8 and 10 and Tables 1 and 2, according to the present invention, the uniformity of the lamination ratio of the resin A and the resin B in the width direction of the laminated film is greatly improved, and the width direction A homogeneously laminated film is obtained.

  The measurement methods for the measurement values appearing in the following examples are as follows.

(A) Lamination thickness, number of laminations:
The layer structure of the film was determined by observation with an electron microscope for a sample whose cross section was cut out using a microtome. That is, using a transmission electron microscope (HU-12 type, manufactured by Hitachi, Ltd.), the cross section of the film was magnified 3,000 to 40,000 times, a cross-sectional photograph was taken, the layer configuration and the thickness of each layer Was measured. Although not carried out because sufficient contrast was obtained in Example 2 described later, the contrast may be increased by using a known dyeing technique depending on the combination of resins used.

  In addition, in the said Example, although the case where the laminated sheet or multilayer film of 2 types of resin was manufactured was demonstrated, when it has three or more manifolds and each slit row | line | column corresponding to them, at least 2 of them By applying the present invention to various types of resins (that is, at least two manifolds and two slit rows corresponding to them), the same effect as in the case of the above embodiment can be obtained.

  In the laminated sheet produced by the present invention, a plurality of types of molten materials (for example, a molten resin or a molten polymer) are laminated in a plurality of layers larger than the number of the types, and then the molten material is solidified. It is formed. The laminated sheet produced according to the present invention is used for every application, but is particularly suitable for applications requiring high lamination accuracy. Certain types of laminated sheets produced according to the present invention have optical characteristics due to the fact that the layer thickness of each layer is changed with high accuracy, and have a broadband interference reflection film, a refractive index control film, and a layer thickness. It is preferably used as a nano-order laminated film.

The perspective view for demonstrating the manufacturing apparatus and manufacturing process of the lamination sheet which are generally used and are also used for implementation of this invention. The disassembled perspective view of an example of the multilayer feed block used in the manufacturing apparatus of the lamination sheet of this invention. The front view of the slit board in the multilayer feed block of this invention of FIG. 2, and a confluence | merging part / discharge path formation member. The S1-S1 cross section arrow directional view in FIG. The S2-S2 cross-sectional arrow view in FIG. The figure explaining the flow path of the molten resin in the slit shown in FIG. 4 and FIG. The figure explaining the dimensional relationship of the slit width of the slit shown in FIG. 6 used in Example 1, and a slit length. The graph which shows distribution in the width direction of the sheet | seat of the lamination | stacking ratio of resin A and resin B of the lamination sheet manufactured based on Example 1. FIG. The figure explaining the dimensional relationship of the slit width of the slit shown in FIG. The graph which shows distribution in the width direction of the sheet | seat of the lamination | stacking ratio of resin A and resin B of the lamination sheet manufactured based on the comparative example 1. FIG. The perspective view which shows the internal space (flow path of a molten material) of the multilayer feed block used for the manufacturing apparatus of the conventional laminated sheet. The figure explaining the flow path of the molten resin in the slit of the conventional multilayer feed block shown in FIG.

Explanation of symbols

1: Molten resin introduction tube to which molten resin A is supplied 2: Molten resin introduction tube to which molten resin B is supplied 3: Multi-layer feed block 4: Conduit through which the laminated flow flows 5: Die (T-die)
6: Laminated sheet 7: Casting drum 8: Unstretched film 11: Multi-layer feed block 12, 13: Resin introduction path 14: Resin A side manifold 15: Resin B side manifold 16, 17: Slit 18: Junction section 19: Discharge path 20: Slit plate 20a: Junction part / discharge path forming member 20b: Partition wall 21, 22: Side plate 23, 24: Inclined part 25: First flow path part 26: Second flow path part 101: Multilayer feed block 102, 103: Resin introduction path 104: Manifold on the resin A side 105: Manifold on the resin B side 106, 107: Pore 108, 109: Slit

Claims (13)

A laminated sheet manufacturing apparatus in which a plurality of types of molten materials are stacked in a plurality of layers larger than the number of the types, wherein the plurality of types of molten materials are positioned between the manifolds and a plurality of manifolds that respectively supply the molten materials. A slit plate that is formed on the slit plate, communicates with any one of the manifolds, and passes through the molten material supplied into the manifolds from the manifolds corresponding to the layers. A plurality of slits arranged at intervals, and a joining portion that joins the molten material that has passed through each slit so as to form the stack, and is arranged so as to sandwich the slit plate, and defines the outline of the manifold. Each of the slits formed on the slit plate is one of the manifolds. The outlet of the nihold is closed by the side wall of the side plate, and the inlet is formed so as to open directly to the outlet of the other manifold. And an apparatus for manufacturing a laminated sheet that is inclined in a direction toward the downstream as it leaves the manifold. For each of the slits communicating with any one of at least two manifolds of the plurality of manifolds, in the width direction of the slit in the flow path of the molten material from the outlet of the manifold to the outlet of the slit, The ratio L1 / L2 between the flow path length L1 of the first flow path section passing through the near side and the flow path length L2 of the second flow path section passing through the side far from the manifold is 0.5 or more. The laminated sheet manufacturing apparatus according to claim 1. A laminated sheet manufacturing apparatus in which a plurality of types of molten materials are stacked in a plurality of layers larger than the number of the types, wherein the plurality of types of molten materials are positioned between the manifolds and a plurality of manifolds that respectively supply the molten materials. A slit plate that is formed on the slit plate, communicates with any one of the manifolds, and passes the molten material supplied into the manifolds from the manifolds corresponding to the layers. A plurality of slits arranged at a predetermined interval; and a joining portion that joins the molten material that has passed through each of the slits so as to form the stack, and is arranged so as to sandwich the slit plate and has an outline of the manifold Each of the slits formed in the slit plate is one of the manifolds. The outlet of the manifold is closed by the side wall of the side plate, and an inlet is formed so as to open directly to the outlet of the other manifold. Each of the slits communicating with one of at least two manifolds of the plurality of manifolds from the outlet of the manifold. In the flow direction of the molten material up to the exit of the slit, in the width direction of the slit, the flow length L1 of the first flow path section passing through the side closer to the manifold and the second flow passing through the side far from the manifold A laminated sheet manufacturing apparatus in which a ratio L1 / L2 to a flow path length L2 of a path portion is 0.5 or more. The apparatus for producing a laminated sheet according to claim 3, wherein an upstream portion of the second flow path portion is formed by an inclined flow path portion that is inclined in a direction toward the downstream as it is separated from the manifold. The laminated sheet manufacturing apparatus according to any one of claims 1, 2, and 4, wherein the inclined channel portion is formed of an inclined channel portion inclined linearly. The slit width in the exit of the said slit is 10 mm or more and 200 mm or less, The manufacturing apparatus of the lamination sheet in any one of Claims 1-5. The apparatus for producing a laminated sheet according to any one of claims 1 to 6, wherein a slit gap of the slit is 0.1 mm or more and 5 mm or less. The apparatus for producing a laminated sheet according to any one of claims 1 to 7, wherein a flow path length LC of a central flow path portion passing through a center in the width direction of the slit in the flow path of the slit is 20 mm or more and 200 mm or less. . The apparatus for producing a laminated sheet according to any one of claims 1 to 8, wherein the number of the plurality of slits is 10 or more and 1,000 or less. The number of these slits is 10 or more and 400 or less, The manufacturing apparatus of the lamination sheet in any one of Claims 1-9. A method of manufacturing a laminated sheet in which a plurality of types of molten materials are laminated in a plurality of layers larger than the number of the types, wherein each molten material is positioned between the manifolds via a plurality of manifolds. Each of the manifolds is connected to one of the manifolds, and is supplied to a plurality of slits arranged at predetermined intervals corresponding to the layers, and the molten material supplied to the slits is supplied to the laminate The two side plates that are arranged so as to sandwich the slit plate are used to form the contour of the manifold, and the slits formed in the slit plate are used as the slits of the manifold. The outlet of one manifold is closed by the side wall of the side plate, and the outlet of the other manifold is directly closed. Layers using an inlet formed so as to be opened, and each slit having a channel inclined portion at the top and inclined toward the downstream as it is separated from the manifold Sheet manufacturing method. For each of the slits communicating with any one of at least two manifolds of the plurality of manifolds, in the width direction of the slit in the flow path of the molten material from the outlet of the manifold to the outlet of the slit, The ratio L1 / L2 between the flow path length L1 of the first flow path section passing through the near side and the flow path length L2 of the second flow path section passing through the side far from the manifold is 0.5 or more. The manufacturing method of the lamination sheet of Claim 11. A method of manufacturing a laminated sheet in which a plurality of types of molten materials are laminated in a plurality of layers larger than the number of the types, wherein each molten material is positioned between the manifolds via a plurality of manifolds. Each of the manifolds is connected to one of the manifolds, and is supplied to a plurality of slits arranged at predetermined intervals corresponding to the layers, and the molten material supplied to the slits is supplied to the laminate The two side plates that are arranged so as to sandwich the slit plate are used to form the contour of the manifold, and the slits formed in the slit plate are used as the slits of the manifold. The outlet of one manifold is closed by the side wall of the side plate, and the outlet of the other manifold is directly closed. Used as the entrance to open is formed, also in accordance with the each slit has a flow path inclined portion at the top, away from the manifold, it is inclined in the direction toward the downstream, also, the plurality As each of the slits communicating with one of at least two manifolds of the manifold, a side closer to the manifold in the width direction of the slit in the flow path of the molten material from the outlet of the manifold to the outlet of the slit A slit having a ratio L1 / L2 of the flow path length L1 of the first flow path section passing through the first flow path section and the flow path length L2 of the second flow path section passing through the side far from the manifold is 0.5 or more. A method for producing a laminated sheet, characterized by being used.

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