JP4882331B2 - Laminate sheet manufacturing apparatus and method - Google Patents

Description

  The present invention relates to an apparatus and a method for manufacturing a laminated sheet.

  A plurality of types (for example, two types) of molten materials (for example, a molten resin or a molten polymer) are supplied to each manifold that receives each molten resin, and the molten resin is supplied from each manifold to a plurality of pores or a plurality of slits. To form a multi-layered molten resin sheet by forming a plurality of molten resin layered flows and forming a multi-layered molten resin sheet, which is orthogonal to the lamination direction of each layer of the molten resin A method of forming a laminated sheet by discharging from a slit-shaped base that extends in the direction (sheet width direction) is known (for example, Patent Document 1). 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.

  In general, a resin having a high refractive index and a resin having a low refractive index are supplied to the molten resin introduction tube 1 and the molten resin introduction tube 2 respectively, and the thicknesses of a pair of layers are alternately arranged at the same ratio in the thickness direction of the film. There is known an optical interference film that reflects or transmits light having a wide-band wavelength, which is sequentially decreased or increased.

  In order to manufacture a multilayer film in which the thickness of each layer or each set of layers changes or sequentially changes in the thickness direction of such a film using the above-mentioned conventional multilayer feed block, the slit of each slit It is necessary to change the gap corresponding to the lamination direction of each layer of the multilayer film to be manufactured. However, in this case, it is necessary to extremely improve the slit machining accuracy, and depending on the required multilayer film, it is necessary to change the slit gap with a dimension of 1 μm or less. It is difficult to achieve the demand.

Patent Document 1 proposes changing the thickness of each layer by controlling the temperature distribution of the feed block. However, with this method, it may be difficult to accurately control the thickness of each layer in the number of layers reaching several tens to several hundreds.
JP 2003-112355 A

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

  Another object of the present invention is to provide a laminated sheet manufacturing apparatus and a laminated sheet manufacturing method that are easy to process a slit and can reduce the manufacturing cost of the slit.

  Still another object of the present invention is to provide a laminate sheet manufacturing apparatus and a laminate capable of easily manufacturing a laminate sheet having a target layer thickness of each layer, in particular, a target layer thickness of each layer different from layer to layer. It is in providing the manufacturing method of a sheet | seat.

  Still another object of the present invention is to provide a method for producing a laminated sheet.

  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 predetermined amount is set so as to allow the respective molten materials to pass through the respective layers. A plurality of slits having a slit length of 10 mm or more and 200 mm or less, a slit gap of 0.1 mm or more and 10 mm or less, and a slit number of 10 or more and 1,000 or less, and the molten materials that have passed through the slits. In a laminated sheet manufacturing apparatus comprising a merge portion that merges so as to form the laminate, the slits of each of the slits are excluded, including slits located at both ends of the plurality of slits, or slits located at both ends. The length changes monotonically in a straight line or curved line from the slit at one end to the slit at the other end in the slit arrangement direction. And it has the by a change in the slit length, the changing the pressure loss of the molten material in each slit, apparatus for producing a laminated sheet for changing the layer thickness of the laminated sheet is provided. When the slit length is less than 10 mm, the pressure loss of the molten material flowing through each slit becomes small, and it may be difficult to set the flow rate of the molten material flowing through each slit to a predetermined flow rate. When the slit length exceeds 200 mm, the pressure loss becomes too large, and there is a possibility that the molten material leaks or the slit is deformed when the apparatus is used repeatedly. If the slit gap is less than 0.1 mm, it may be difficult to control the processing apparatus when manufacturing the slit. When the slit gap exceeds 10 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 material flowing through each slit Loss is reduced, and it may be difficult to set the flow rate of the molten material flowing through each slit to a target flow rate. When the number of slits is small, such as less than 10, the unique effect of the present invention is hardly exhibited. When the number of slits exceeds 1,000, the longitudinal direction of the feed blocks to be laminated (resin The feed block may become too large in the stacking direction).

According to a preferred embodiment of the present invention, monotonic variation of this may be stepwise changed every two to three slits may be changed stepwise for each further slit .

Further, according to a preferred embodiment of the present invention, the slit gaps of the plurality of slits corresponding to the respective molten materials are substantially excluded except for the slits located at both ends of the plurality of slits or including the slits located at both ends. identical (-5% to + 5% of the target value) production equipment of the laminated sheet is a is provided. The slit gaps of the plurality of slits corresponding to each molten material are substantially the same, the slit gaps of the plurality of slits through which one molten material passes are substantially the same, and the other one molten material The slit gaps of the plurality of slits through which pass is substantially the same. That is, for example, each slit gap of the plurality of slits through which the molten material A passes is 0.7 mm, and each slit gap of the plurality of slits through which the molten material B passes is 0.5 mm . If the slit gap multiple slits are substantially identical, in their slits, by changing the slit length, readily, it is possible to control the thickness to be precisely targeted the thickness of each layer .

Also, the slit gap of each slit, and more preferably 0.1mm or more 5mm or less.

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 on a plurality of layers larger than the number of the types, wherein each of the molten materials is added to each of the layers. Supply to a plurality of slits having a slit length of 10 mm or more and 200 mm or less, a slit gap of 0.1 mm or more and 10 mm or less, and a number of slits of 10 or more and 1,000 or less arranged so as to pass correspondingly, When joining the molten materials that have passed through the slits so as to form the stack, as the slits, except for slits located at both ends of the plurality of slits, or including slits located at both ends, The slit length of each of the slits is linear or curved from the slit at one end to the slit at the other end in the slit arrangement direction. By using the slit is changed in tone, said changing the pressure loss of the molten material in each slit, method for producing a laminated sheet for changing the layer thickness of the laminated sheet is provided.

  According to the laminated sheet manufacturing apparatus of the present invention, it is possible to easily manufacture a laminated sheet in which the thickness of each layer is a target value or a design value.

  In the laminated sheet manufacturing apparatus according to the present invention, the thickness of each layer can be easily controlled to a desired value by making the slit lengths of the respective slits different. Further, since the slit gap may be kept constant, the slit processing becomes easy. Furthermore, by continuously changing the slit length in the slit arrangement direction, the thickness of each layer can be changed continuously, and a laminated sheet having target optical characteristics can be easily manufactured. .

  2 to 5 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 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.

  The multi-layer feed block 11 shown in FIG. 3 is characterized in that the slit lengths of the arranged slits 16 and 17 are not uniform. Note that the slit plate with an uneven slit length may not have the inclined portions 23 and 24 shown in FIGS. 4 and 5. However, here, as shown in FIG. 3, description will be made using a multilayer feed block having an inclined portion.

  In FIG. 3, the slit length SL of a large number of slits 16 and 17 provided alternately on the slit plate 20 via the partition walls 20b is one end in the arrangement direction of the slits 16 and 17 (X-axis direction shown in FIG. 3). Is set so as to change monotonously and linearly from one end to the other end. That is, the slit at one end has the shortest slit length SLmin, and the slit at the other end has the longest slit length SLmax. The slit length SL is the length of the slit in the vertical direction (Z-axis direction shown in FIG. 3). When the top of the slit is inclined, it is the length in the vertical direction (Z-axis direction shown in FIG. 3) of the slit at the center position of the slit width. In the embodiment of FIG. 3, the slit gap is substantially the same for all slits.

  As shown in FIG. 3, the multilayer feed block 11 having the slit plate 20 in which the slit lengths of the slits 16 and 17 are set so as to change monotonously from one end to the other end is shown in FIG. Used as a multilayer feed block 11 of a laminated sheet manufacturing apparatus. FIG. 6 shows a cross section of an example of a laminated sheet (multilayer film) produced using this laminated sheet producing apparatus.

  In FIG. 6, the laminated sheet 31 has a structure in which layers 32 made of resin A and layers 33 made of resin B are alternately laminated. The characteristic point is that the thickness of the layer 32 and the layer 33 gradually decreases from one surface of the laminated sheet 31 to the other surface, that is, in the thickness direction of the laminated sheet (arrow 30 shown in FIG. 6). It is an increasing point.

  A laminated sheet (multilayer film) 31 in which the thickness of each layer is sequentially changed has a reflectance region 35 that is clearly partitioned with respect to a wide wavelength range, for example, as shown in FIG. Show properties. Therefore, the laminated sheet (multilayer film) 31 is used as an interference reflection film that reflects or transmits light with a wide-band wavelength using optical interference. Note that the horizontal axis of the wavelength-reflectance graph of FIG. 7 is the wavelength WL (nm), and the vertical axis is the reflectance RR (%).

  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. In Example 1 described later, sufficient contrast was obtained, but this was not performed. However, depending on the combination of resins used, the contrast may be increased using a known dyeing technique.

(B) Reflectance:
A spectrophotometer (U-3410, Spectrophotometer: manufactured by Hitachi, Ltd.) was fitted with an integrating sphere (130-0632, manufactured by Hitachi, Ltd.) having a diameter of 60 mm and an angled 10 ° inclined spacer, and the reflectance was measured. . The band parameter was set to 2 / servo, the gain was set to 3, and 187 nm to 2,600 nm / min. Measured at a detection speed of In order to standardize the reflectance, the attached Al ₂ O ₃ was used as a standard reflector.

(C) Melt viscosity:
The melt viscosity at a shear rate of 100 (s ⁻¹ ) was measured using a Shimadzu flow tester (CFT-500). The die used at this time had a diameter of 1 mm and a measurement stroke of 10 to 13. The n number (number of measurements) was 3, and the average value was adopted.

[Example 1]
Two types of thermoplastic resin A and thermoplastic resin B were prepared. As the thermoplastic resin A, polyethylene terephthalate (PET) (F20S, manufactured by Toray Industries, Inc.) having a melt viscosity at 280 ° C. of 180 Pa · s was used. As the thermoplastic resin B, polyethylene terephthalate (PE / CHDM · T) (PETG6763 manufactured by Eastman Co., Ltd.) obtained by copolymerizing 30 mol% of cyclohexanedimethanol having a melt viscosity at 280 ° C. of 350 Pa · s with respect to ethylene glycol was used. These thermoplastic resins A and B were each dried and then supplied to an extruder.

  The thermoplastic resins A and B were each melted at a temperature of 280 ° C. with an extruder, passed through a gear pump and a filter, and then introduced into the multilayer feed block from the respective introduction pipes. As the multilayer feed block, an apparatus having 801 slits was used. The shape of the slit has an upper inclined portion as shown in FIGS.

  The dimension of each slit is such that when the thermoplastic resin is supplied at a total supply rate of 200 kg / h, the pressure loss difference is 1.5 MPa, and the layer on the back side from the layer on the front side of the laminated sheet (multilayer film) The thickness of the layer gradually decreases toward the surface, and the ratio of the surface layer thickness / back surface layer thickness becomes 0.69 so that the longest slit length SLmax (29 mm) / the shortest slit length SLmin (20 mm). The slit length was assumed to change linearly as shown in FIG. 3 so that the ratio was 1.45.

  The thermoplastic resin A is supplied to the manifold 14 shown in FIG. 4, the thermoplastic resin B is supplied to the manifold 15 shown in FIG. 5, and the thermoplastic resin A layer that has passed through the corresponding slits 16 and 17 Layers of thermoplastic resin B are alternately layered so that both surface layers are made of thermoplastic resin A, and the thickness of each layer gradually increases from one surface side to the opposite surface side. A sheet was obtained.

  Here, the slit gap and the supply amount of each resin were adjusted so that the thickness ratio of the thermoplastic resin A layer and the thermoplastic resin B layer adjacent to each other was 0.95. The slit gap of the slit 16 through which the adjusted resin A passes was 0.5 mm, and the slit gap of the slit 17 through which the resin B passes was 0.6 mm.

  The thus obtained 801-layered laminar flow is supplied to the T-die 5 and formed into a sheet shape, and then rapidly cooled and solidified on the casting drum 7 that is electrostatically applied and the surface temperature is kept at 25 ° C. did.

  The obtained cast film 8 is heated by a group of rolls set at a temperature of 90 ° C. and 3. 3 mm in the longitudinal direction (film longitudinal direction) while being rapidly heated from both sides of the film by a radiation heater within a stretching section length of 100 mm. The film was stretched 4 times.

  Thereafter, both surfaces of the uniaxially stretched film were subjected to corona discharge treatment in the air, the wetting tension of the surface of the film (base film) was 55 mN / m, and the glass transition temperature Tg was 18 ° C. on the treated surface. Of the polyester resin) / (polyester resin having a glass transition temperature Tg of 82 ° C.) / (Silica particles having an average particle diameter of 100 nm) is applied, and the surface of the base film is transparent and slippery. And a surface layer having easy adhesion was formed.

  This uniaxially stretched film was guided to a tenter, preheated with hot air at a temperature of 110 ° C., and then stretched 3.7 times in the transverse direction (film width direction). The stretched film was directly heat-treated in the tenter with hot air at a temperature of 230 ° C., then subjected to a relaxation treatment of 5% in the width direction at the same temperature, and then gradually cooled to room temperature and wound up. .

  The obtained biaxially stretched multilayer film has a total thickness of 125 μm, and as shown in the graph of FIG. 8, the thickness of the layer made of the thermoplastic resin A is 180 nm as it goes from the front surface to the back surface. The thickness of the layer made of the thermoplastic resin B gradually decreased from 190 nm to 130 nm and gradually decreased from 190 nm to 130 nm as it moved from the front surface to the back surface. The horizontal axis of the graph of FIG. 8 is the layer number LN (1 to 801) and the slit length SL (mm) from the film surface, and the vertical axis is the layer thickness LT (nm). Black dots in the graph indicate measured values for the thermoplastic resin A, and white circles indicate measured values for the thermoplastic resin B.

  The reflectivity of this film is shown in FIG. As shown in FIG. 9, this film had very high reflectance and wavelength selectivity. On the other hand, even if the film was formed continuously for one week, the outflow of heat-deteriorated foreign matter and the occurrence of film breakage due to the foreign matter did not occur, and the film physical properties did not change. The horizontal axis of the graph of FIG. 9 is the wavelength WL (λ) (nm), and the vertical axis is the intensity reflectance IR.

  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.

  Moreover, depending on conditions, about the slit located in both ends among several slits, the influence of the wall surface inside a manufacturing apparatus may be received. The slits at both ends may be configured not to satisfy the conditions of the present invention. Rather, the slits at both ends may eventually satisfy the conditions of the present invention. However, if the conditions of the present invention are looked at at least in the slits excluding both ends, the effects of the present invention can be obtained.

  The laminated sheet produced according to the present invention is formed by laminating a plurality of types of molten materials in a plurality of layers larger than the number of the types and then solidifying the molten material. ADVANTAGE OF THE INVENTION According to this invention, the lamination sheet in which the thickness of each layer in the width direction of a lamination sheet shows the value as a target value or a design value can be manufactured easily. The laminated sheet produced according to the present invention has optical characteristics due to the fact that the layer thickness of each layer is changed with high accuracy, a broadband interference reflection film, a refractive index control film, and a laminated film having a layer thickness of nano-order. Are preferably used.

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 an example of the slit board of this invention. The S1-S1 cross section arrow directional view in FIG. The S2-S2 cross-sectional arrow view in FIG. The cross-sectional view of the lamination sheet manufactured using the slit board of this invention of FIG. The graph which shows the optical characteristic of the lamination sheet of FIG. 6 by the relationship between the wavelength of light, and a reflectance. The graph which shows the thickness distribution of each layer of resin A and resin B of the lamination sheet manufactured based on Example 1 by the relationship between the laminated layer number and the slit length shown in FIG. The graph which shows the optical characteristic of the lamination sheet manufactured based on Example 1 with the relationship between the wavelength of light, and an intensity | strength reflectance.

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 30: Thickness direction of film 31: Laminated sheet (multilayer film)
32: Layer made of resin A 33: Layer made of resin B 35: Reflectance region

Claims (3)

An apparatus 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, with a predetermined interval so as to allow the respective molten materials to pass through the respective layers. A plurality of slits having an array of slit lengths of 10 mm or more and 200 mm or less, a slit gap of 0.1 mm or more and 10 mm or less, and a slit number of 10 or more and 1,000 or less, and the molten materials that have passed through the slits are laminated. In a laminated sheet manufacturing apparatus comprising a joining portion that joins so as to form a slit, the slit length of each of the slits including the slits located at both ends of the plurality of slits is excluded or includes slits located at both ends. In the arrangement direction of the slits, it changes monotonously in a straight line or a curved line from one slit to the other slit. Wherein a change in the slit length, the changing the pressure loss of the molten material in each slit, apparatus for producing a laminated sheet for changing the layer thickness of the laminated sheet. Excluding slits located at both ends of the plurality of slits, or including slits located at both ends, the slit gaps of the plurality of slits corresponding to each molten material are substantially the same (from -5% of the target value) The laminated sheet manufacturing apparatus according to claim 1, wherein the range is + 5%. A method of 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, wherein the molten materials are arranged at predetermined intervals so as to pass through the layers corresponding to the layers. The slit length is 10 mm or more and 200 mm or less, the slit gap is 0.1 mm or more and 10 mm or less and the number of slits is 10 or more and 1,000 or less, and each molten material that has passed through each slit is When merging so as to form a stack, the slits of each of the slits, except for the slits located at both ends of the plurality of slits, including the slits located at both ends, are arranged in the arrangement of the slits. In the direction, from the slit at one end to the slit at the other end, the slit that is monotonously changing linearly or curvedly By there, the changing the pressure loss of the molten material in each slit, method for producing a laminated sheet for changing the layer thickness of the laminated sheet.

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