JP2006130912A - Laminated sheet manufacturing apparatus and laminated sheet manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated sheet manufacturing apparatus capable of easily manufacturing a laminated sheet of which the respective layers have thicknesses according to target or plan values, and a laminated sheet manufacturing method. <P>SOLUTION: In the manufacturing apparatus of the laminated sheet wherein different molten materials are alternately laminated by allowing the different molten materials to flow out of the adjacent slits among a large number of slits arranged so as to leave interval, the flow rate of the molten material in the slits is adjusted by the adjustment of the slit interval of the slits, the adjustment of the slit length of the slits or the adjustment of the temperature of the molten material in the slits. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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 (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.

On the other hand, according to the knowledge of the present inventor, for the purpose of an optical interference film, the laminated structure of each layer of the multilayer film was designed, and when the above-mentioned conventional multilayer feed block was used, the formation of the multilayer film was predicted. Rather than the occurrence of irregular thickness of each irregular layer, the closer to the surface of the film, the thinner the layer thickness is to be formed compared to the designed layer thickness (target layer thickness) of the film. There was found. That is, it has been found that it is difficult to produce a multilayer film having a target thickness of each layer in the conventional multilayer feed block.
JP 2003-112355 A

  The objective of this invention is providing the manufacturing apparatus and manufacturing method of a lamination sheet which can manufacture the lamination sheet as the thickness of each layer as a target value or a design value easily.

  Another 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 target layer thickness of each layer, in particular, a target layer thickness of each layer different from layer to layer. Is to provide.

  Still another object of the present invention is to provide a laminated sheet manufacturing apparatus and manufacturing method capable of efficiently adjusting the dimension of the slit to the optimum dimension for the purpose of adjusting the flow rate of the molten material in the slit. There is to do.

  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 multilayer molten material sheet comprising a plurality of slits arranged at intervals, a merging portion that merges the molten material that has passed through each slit so as to form the lamination, and a molten material that is laminated at the merging portion And a stack for forming the laminated sheet composed of the plurality of types of materials formed by solidifying the molten materials of the derived multilayer molten material sheet. In a laminated sheet manufacturing apparatus comprising a sheet forming apparatus, based on the layer thickness information obtained by measuring the thickness of a desired layer of the formed laminated sheet It said plurality of at least one of an apparatus for producing a laminated sheet flow can be adjusted in the molten material in the slit of the slit is provided.

  Further, according to a preferred embodiment of the present invention, there is provided a laminated sheet manufacturing apparatus in which the flow rate of the molten material is adjusted by adjusting one or both of the slit gap and the slit length of the slit.

  According to a preferred embodiment of the present invention, there is provided the laminated sheet manufacturing apparatus in which the thickness of the layer is measured for each layer of the laminated sheet, and the flow rate of the molten material is adjusted by adjusting the slit gap. Provided.

  Further, according to a preferred embodiment of the present invention, there is provided the laminated sheet manufacturing apparatus in which the thickness of the layer is measured for each layer of the laminated sheet, and the flow rate of the molten material is adjusted by adjusting the slit length. Provided.

  Moreover, according to the preferable form of this invention, the manufacturing apparatus of the lamination sheet with which adjustment of the flow volume of the said molten material is performed by adjustment of the temperature of the said molten material which passes the slit brought about by adjustment of the temperature of the said slit is provided. Is done.

  Further, according to a preferred embodiment of the present invention, the adjustment of the flow rate of the molten material is a layer in which the slit gap of the slit corresponding to the formation of the layer located in the outer layer part in the thickness direction of the laminated sheet is located in the inner layer part. An apparatus for manufacturing a laminated sheet is provided that is adjusted to be larger than the slit gap of the slit corresponding to the formation of.

  Further, according to a preferred embodiment of the present invention, the adjustment of the flow rate of the molten material is a layer in which the slit length of the slit corresponding to the formation of the layer located in the outer layer part in the thickness direction of the laminated sheet is located in the inner layer part An apparatus for manufacturing a laminated sheet is provided that is adjusted to be shorter than the slit length of the slit corresponding to the formation of.

  According to a preferred embodiment of the present invention, the flow rate of the molten material is adjusted mechanically or thermally by adjusting one or both of the slit gap and the slit length with respect to at least one slit of the plurality of slits. An apparatus for producing a laminated sheet is provided.

According to a preferred embodiment of the present invention, the thickness measurement value of an arbitrary layer x in the thickness direction of the laminated sheet is T (x), the slit gap corresponding to this thickness measurement value is d (x), and the slit When the length is L (x), the target thickness of the layer x is Ta (x), the target slit gap corresponding to this target thickness is da (x), and the target slit length is La (x), Ta (x x) / T (x)
= [La (x) / L (x)] × [d (x) ³ / da (x) ³ ]. . . (I)
Thus, there is provided a laminated sheet manufacturing apparatus in which the flow rate of the molten material is adjusted for the slit corresponding to the layer x.

  When the lamination distribution of the obtained laminated sheet is different from the target value, the lamination distribution is substantially targeted by adjusting the slit gap d and the slit length L so that the relationship of the above formula (I) is satisfied. Can be a value.

  There are two parameters in the formula (I), the slit gap and the slit length. However, depending on the case, either one may be fixed and the other adjustment may be attempted. For example, when the slit gap distribution is changed, the slit gap may be calculated by setting the slit length ratio La / L = 1. Since the slit gap changes to the third power, adjustment of the slit gap is effective for correcting a large thickness change. On the other hand, when it is desired to provide a minute thickness distribution, it is effective to change the slit length that works linearly.

  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. When supplying the plurality of slits arranged at predetermined intervals so as to pass correspondingly and joining the molten material that has passed through each slit so as to form the laminate, a desired laminate sheet is formed. Based on the thickness information of the layer obtained by measuring the thickness of the layer, the flow rate of the molten material in at least one slit of the plurality of slits is adjusted for each slit. A method is provided.

  Moreover, according to the preferable form of this invention, the manufacturing method of the lamination sheet which adjusts the flow volume of the said molten material by adjusting one or both of the slit clearance gap and slit length of the said slit is provided.

  Further, according to a preferred embodiment of the present invention, there is provided a method for producing a laminated sheet in which the thickness of the layer is measured for each layer of the laminated sheet, and the flow rate of the molten material is adjusted by adjusting the slit gap. The

  Further, according to a preferred embodiment of the present invention, there is provided a method for producing a laminated sheet in which the thickness of the layer is measured for each layer of the laminated sheet, and the flow rate of the molten material is adjusted by adjusting the slit length. The

  Further, according to a preferred embodiment of the present invention, there is provided a method for producing a laminated sheet, wherein the flow rate of the molten material is adjusted by adjusting the temperature of the molten material passing through the slit caused by adjusting the temperature of the slit. The

  Further, according to a preferred embodiment of the present invention, the flow rate of the molten material is adjusted so that the slit gap of the slit corresponding to the formation of the layer located in the outer layer part in the thickness direction of the laminated sheet is the layer located in the inner layer part. There is provided a method for producing a laminated sheet that is adjusted by adjusting the gap larger than the slit gap of the slit corresponding to the formation of.

  Further, according to a preferred embodiment of the present invention, the flow rate of the molten material is adjusted so that the slit length of the slit corresponding to the formation of the layer located in the outer layer portion in the thickness direction of the laminated sheet is the layer located in the inner layer portion. The manufacturing method of the lamination sheet performed by adjusting shorter than the slit length of the slit corresponding to formation of this is provided.

  According to a preferred embodiment of the present invention, the flow rate of the molten material is adjusted mechanically or thermally by adjusting one or both of the slit gap and the slit length with respect to at least one slit of the plurality of slits. The manufacturing method of the lamination sheet performed by doing is provided.

According to a preferred embodiment of the present invention, the thickness measurement value of an arbitrary layer x in the thickness direction of the laminated sheet is T (x), the slit gap corresponding to this thickness measurement value is d (x), and the slit When the length is L (x), the target thickness of the layer x is Ta (x), the target slit gap corresponding to this target thickness is da (x), and the target slit length is La (x), Ta (x x) / T (x)
= [La (x) / L (x)] × [d (x) ³ / da (x) ³ ]
In order to satisfy the above relationship, there is provided a method for manufacturing a laminated sheet in which the flow rate of the molten material is adjusted for the slit corresponding to the layer x.

  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 flow rate of the molten material in each slit of the multilayer feed block can be easily adjusted to the optimum flow rate using the thickness information of the layer of the actually formed laminated sheet. A laminated sheet having a target laminated structure can be easily produced.

  In the laminated sheet manufacturing apparatus according to the present invention, it is possible to easily adjust the dimension of each slit in the multilayer feed block to the optimum dimension by using the thickness information of the layer of the actually formed laminated sheet. A laminated sheet having a laminated structure can be easily produced.

  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 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.

  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 multilayer feed block 11 shown in FIG. 3 is characterized by measuring the flow rate of the molten resin in the arranged slits 16 and 17 and the thickness of a desired layer or all layers of the laminated sheet formed using the multilayer feed block 11. Based on the thickness information of the layer obtained by this, the thickness of the layer can be adjusted to a target value (design value).

  Specific examples of means for adjusting the flow rate of the molten resin include adjusting the slit gap, adjusting the slit length, or adjusting the temperature of the molten resin flowing in the slit.

  FIG. 6 shows a cross section of the laminated sheet obtained when the laminated sheet is formed using the multilayer feed block 11 of FIG. In the laminated sheet 31a of FIG. 6, the layers 32a made of the resin A and the layers 33a made of the resin B are alternately laminated. In this case, as described as a problem of the conventional multilayer feed block, the closer to the surface layer of the multilayer film, the thinner the thickness tends to be. This state is shown in the multilayer film 31a of FIG. As a design target of the multilayer film 31a, when the thickness of each layer in the film thickness direction (arrow 30 shown in FIG. 6) is required to be uniform, the multilayer film 31a in which the change in the layer thickness exists in this way is It becomes a defective product.

  The multilayer feed block 11 shown in FIG. 7 solves this problem. In the slit 16 and the slit 17 alternately arranged via the partition walls 20b in the slit plate 20 in the multilayer feed block 11 of FIG. 7, the slit gap becomes larger as the slit corresponding to the layer located on the surface layer side of the multilayer film 31a. Have been adjusted so that. Adjustment of the size of the slit gap is made based on the thickness information of each layer obtained by measuring the thickness of each layer of the laminated sheet 31a shown in FIG.

  This adjustment is based on the thickness information of each layer obtained by measuring the thickness of each layer of the laminated sheet, and the slit dimension of the slit plate 20 of the multilayer feed block 11 is mechanically or thermally equipped in the multilayer feed block 11. It can be done by means. In this case, the layer thickness is automatically measured and a signal based on the measured data is fed back to the mechanical or thermal means, and the mechanical or thermal means is automatically activated based on this, and the slit dimension is automatically set. You may make it adjust to. In addition, this adjustment is based on the thickness information of each layer obtained by measuring the thickness of each layer of the laminated sheet. In the multilayer feed block 11, the slit plate 20 shown in FIG. It can also be performed by exchanging with the slit plate 20 made. This adjustment may be performed by mechanical means such as a hydraulic mechanism, a pneumatic mechanism, a screw mechanism, and various linear motion mechanisms.

  The multi-layer feed block 11 shown in FIG. 8 solves the above problems. The slit 16 and the slit 17 alternately arranged via the partition walls 20b in the slit plate 20 in the multilayer feed block 11 of FIG. 8 have a shorter slit length as the slit corresponding to the layer located on the surface layer side of the multilayer film 31a. Have been adjusted so that. The adjustment of the length of the slit length is made based on the thickness information of each layer obtained by measuring the thickness of each layer of the laminated sheet 31a shown in FIG. 6, for example, each slit plate 20 is in the length direction. A mechanical mechanism such as a cam mechanism that reciprocally moves, a cylinder mechanism such as hydraulic or pneumatic pressure, or a screw mechanism may be used.

  The laminated sheet obtained by manufacturing the laminated sheet using the multilayer feed block 11 having the slit plate in which the slit gap as shown in FIG. 7 is adjusted based on the measurement result of the layer thickness is, for example, FIG. The laminated structure as shown in FIG. That is, the layer 32b made of resin A and the layer 33b made of resin B of the laminated sheet 31b have substantially uniform predetermined target values in the film thickness direction (arrow 30 shown in FIG. 9). It becomes.

  The multilayer feed block shown in FIG. 10 adjusts the flow rate of the molten resin in the slit by a method different from the embodiment described above. In FIG. 10, the multi-layer feed block 51 has means for mechanically adjusting the gap between the slits using a heat bolt. A slit gap holding and bending portion 52 is provided above the arrangement position of the slits 16 and 17. A number of heat bolts 54 are arranged at intervals in the slit arrangement direction on the upper surface of the slit gap holding and bending portion 52, and a cartridge heater 53 is attached to each heat bolt 54.

  Each cartridge heater 53 adjusts the amount of expansion / contraction of each heat bolt 54 by turning it on / off or adjusting the temperature. By adjusting the amount of expansion / contraction, the amount of bending of the slit gap holding bending portion 52 is adjusted. By adjusting the deflection amount, the slit gaps of the slits 16 and 17 in the multilayer feed block 51 are adjusted. Specifically, when the heat bolt 54 is extended, the slit gap holding and bending portion 52 is bent in the flow direction of the molten resin, and the slit gap is widened. This widening increases the flow rate of the molten resin in the slit. Similarly, when the heat bolt 54 contracts, the reverse phenomenon occurs.

  A multilayer feed block 61 shown in FIG. 11 includes a slit gap holding and bending portion 62 for each of the slits 16 and 17, similarly to the multilayer feed block 51 of FIG. 10. However, the heat bolt 54 is not provided, and the cartridge heaters 63 arranged at intervals in the slit arrangement direction are embedded in the slit gap holding and bending portion 62.

  The multilayer feed block 61 thermally controls the amount of bending of the slit gap holding and bending portion 62 by controlling the temperature by each cartridge heater 63, thereby adjusting the slit gap of each of the slits 16 and 17. is there.

  According to the multilayer feed block 51 shown in FIG. 10 and the multilayer feed block 61 shown in FIG. 11, the flow rate of the molten resin in a desired slit can be adjusted easily and accurately during the formation of the laminated sheet. .

  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.

(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. Further, in order to standardize the reflectance, the attached Al ₂ O ₃ was used as a standard reflector.

(C) Waveguide performance:
The waveguide performance was performed by confirming the light conduction under the following conditions based on JIS C6823 (1999) light conduction (IEC 60793-1-C4).

Light source: LED
Sample shape: width 10cm, length 3m
Reference optical fiber: “Super Esca” SH4001 manufactured by Mitsubishi Rayon Co., Ltd.

[Example 1]
The following values were adopted as design values for the multilayer film 31b shown in FIG.

Lamination ratio A / B of resin A and resin B: 2/1,
Total number of layers: 201
The thickness of each layer of resin A (each A layer): 100 nm, and
The thickness of each layer of resin B (each B layer): 50 nm.

  As the design values of the slit plate 20 of the multilayer feed block 11 shown in FIG. 3, the slits 16 (slits A-1 to A-101) through which the resin A shown in FIG. The following values were adopted for B-1 to B-100).

Slit gap of each slit 16 corresponding to each A layer: 0.75 mm,
Slit gap of each slit 17 corresponding to each B layer: 0.6 mm,
Slit width of each slit 16, 17: 24mm, and
Slit length of each slit 16, 17: 20 mm.

  The distribution of the slit gap values of the slit 16 with respect to the resin A at this design value in the slits A-1 to A-101 is indicated by the line ASG in the upper graph (FIG. 13A) of FIG. The distribution of the slit gap value of the slit 17 with respect to the resin B in the value in the slits B-1 to B-100 is indicated by a line BSG in the lower graph of FIG. 13 (FIG. 13B). The horizontal axis of the graph of FIG. 13A is the slit number ASN, and the vertical axis is the slit gap SG (mm). The horizontal axis of the graph of FIG. 13B is the slit number BSN, and the vertical axis is the slit gap SG (mm).

  When a multilayer film was manufactured using the multilayer feed block 11 designed in this way, a multilayer film having a thickness distribution of each layer shown in FIG. 14 was obtained. The horizontal axis of the graph of FIG. 14 is the number of stacked layers Ln, and the vertical axis is the layer thickness LT (nm) of each A layer and each B layer. The line AL in the graph of FIG. 14 indicates the distribution target value in the thickness direction of the multilayer film for each A layer thickness, the line BL indicates the distribution target value in the thickness direction of the multilayer film for each B layer, and the curve ALTD shows the distribution of measured values of the thickness of each A layer in the manufactured multilayer film, and curve BLTD shows the distribution of measured values of the thickness of each B layer in the manufactured multilayer film.

  Based on the measured thickness information of each A layer and each B layer of the manufactured multilayer film shown in FIG. 14, the following formula (I) is used so that the thickness of each layer matches the initial design value (target value) as much as possible. Using the relationship shown, the adjustment value of the dimension of each slit was calculated and obtained.

Ta (x) / T (x)
= [La (x) / L (x)] × [d (x) ³ / da (x) ³ ]. . . (I)
Here, T (x) is a measured value of the thickness of the layer x (current thickness of the layer x), d (x) is a slit gap of the slit corresponding to the measured value of the thickness of the layer x, L ( x) is the slit length of the slit corresponding to the measured value of the thickness of the layer x, Ta (x) is the target thickness of the layer x, and da (x) is the slit corresponding to the target thickness of the layer x. The slit gap, La (x), is the slit length of the slit corresponding to the target thickness of the layer x.

  Based on the value obtained by calculation using the formula (I), the slit gap of each initial slit was adjusted. After the adjustment, that is, the distribution state of the slit gap value of the slit 16 with respect to the target resin A in the slits A-1 to A-101 is indicated by a line TASG in the upper graph (FIG. 15A) of FIG. After the adjustment, that is, the distribution of the slit gap value of the slit 17 with respect to the target resin B in the slits B-1 to B-100 is shown by a line TBSG in the lower graph of FIG. 15 (FIG. 15B). The graph of FIG. 15 corresponds to the graph of FIG. 13, and FIG. 15 also shows a line ASG and a line BSG in FIG.

  A multilayer film was manufactured based on the slit plate 20 having the adjusted dimensions. The thickness distributions ALTD and BLTD of each layer of the obtained multilayer film are greatly improved as shown in FIG. 16, and each A layer and each B layer have a substantially uniform thickness distribution, and the target multilayer film is obtained. It was. The graph of FIG. 16 corresponds to the graph of FIG.

  Although the result of Example 1 was mainly demonstrated above, the specific manufacturing method of the multilayer film in Example 1 is as follows.

Resin A: Polyethylene terephthalate (PET) resin (Toray Industries, Inc., thermoplastic resin F20S),
Resin B: Cyclohexanedimethanol copolymerized PET (Etherman thermoplastic resin PETG6763),
Resin supply: Each resin is dried and then supplied to the extruder. The temperature of the molten resin in the extruder is set at 280 ° C. After each resin was passed through a gear pump and a filter, each resin was supplied to the multi-layer feed block 11 forming a 201-layer laminate and merged to form a laminate sheet of resin A and resin B.

  Multilayer feed block: Molten resin is discharged from slits 16 and 17 (processing accuracy 0.01 mm) corresponding to the A layer 101 layer and the B layer 100 layer, and the lamination ratio of the molten resin A and the molten resin B is A: B = 2: 1 so that both surface layer portions of the laminated sheet are A layers.

  Discharge of laminated sheet: The obtained molten resin layered flow is supplied to the T-die 5 shown in FIG. 1 and formed into a sheet shape, and then electrostatically applied (DC voltage 8 kV) surface temperature 25 ° C. Was rapidly cooled and solidified on the casting drum 7.

  Surface treatment of laminated sheet: Both surfaces of cast film 8 are subjected to corona discharge treatment in the air, the surface of this film (base film) has a wetting tension of 55 mN / m, and the treated surface has (glass transition temperature Tg). Is a 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 easy to apply. A surface layer having lubricity and easy adhesion was formed.

  Heat treatment of laminated sheet: The surface-treated laminated sheet is guided to a biaxial stretching machine, preheated with hot air at a temperature of 95 ° C, and stretched 3.5 times in the longitudinal direction (film longitudinal direction) and lateral direction (film width direction). did. Further, heat treatment was performed with hot air at a temperature of 230 ° C., and at the same time, a relaxation treatment of 5% was performed in the vertical direction, followed by a relaxation treatment of 5% in the lateral direction.

Multilayer film produced: The thickness of the obtained multilayer film is 14.8 μm, the wavelength of the primary reflection peak is 488 nm, the reflectance is 95%, and there is almost no secondary reflection peak, so it is unnecessary in the ultraviolet region. It was an excellent multilayer film in which no significant reflection was observed.
[Example 2]
The following values were adopted as design values for the multilayer film 31b shown in FIG.

Lamination ratio A / B of resin A and resin B: 0.95 / 1,
Total number of layers: 601
Thickness of each layer of resin A (each A layer): thickness monotonously changing from 170 nm to 135 nm, and
The thickness of each layer of resin B (each B layer): a thickness that monotonously changes from 180 nm to 145 nm.

  As design values of the slit plate 20 of the multilayer feed block 11 shown in FIG. 3, the slits 16 (slits A-1 to A-301) through which the resin A shown in FIG. The following values were adopted for B-1 to B-300).

Slit gap of each slit 16 corresponding to each A layer: gap monotonously changing from 4.91 mm to 4.55 mm, and
Slit gap of each slit 17 corresponding to each B layer: A gap that monotonously changes from 5.00 mm to 4.65 mm.

  The distribution of the slit gap values of the slit 16 with respect to the resin A at this design value in the slits A-1 to A-301 is indicated by the line ASG in the upper graph (FIG. 18A) of FIG. The distribution of the slit gap values of the slit 17 relative to the resin B in the values in the slits B-1 to B-300 is indicated by a line BSG in the lower graph of FIG. 18 (FIG. 18B). The graph of FIG. 18 corresponds to the graph of FIG.

  When a multilayer film was manufactured using the multilayer feed block 11 designed in this way, a multilayer film having a thickness distribution of each layer as shown in FIG. 19 was obtained. The graph of FIG. 19 corresponds to the graph of FIG.

  Based on the measured thickness information of each A layer and each B layer of the manufactured multilayer film shown in FIG. 19, the above formula (I) is used so that the thickness of each layer matches the initial design value (target value) as much as possible. Using the relationship shown, the adjustment value of the dimension of each slit was calculated and obtained.

  Based on the value obtained by calculation using the formula (I), the slit gap of each initial slit was adjusted. After the adjustment, that is, the distribution state of the slit gap value of the slit 16 with respect to the target resin A in the slits A-1 to A-301 is indicated by a line TASG in the upper graph (FIG. 20A) of FIG. After the adjustment, that is, the distribution state in the slits B-1 to B-300 of the value of the slit gap of the slit 17 with respect to the target resin B is indicated by a line TBSG in the lower graph of FIG. 20 (FIG. 20B). . The graph of FIG. 20 corresponds to the graph of FIG. 18, and FIG. 20 also shows a line ASG and a line BSG in FIG.

  A multilayer film was manufactured based on the slit plate 20 having the adjusted dimensions. The thickness distributions ALTD and BLTD of each layer of the obtained multilayer film are greatly improved as shown in FIG. 21, and each A layer and each B layer have a thickness distribution very close to the target thickness distribution, which is the target. A multilayer film was obtained. The graph of FIG. 21 corresponds to the graph of FIG.

  Although the results of Example 2 have been mainly described above, the specific method for producing the multilayer film in Example 2 is as follows.

Resin A: PET resin (Toray Industries, Inc. thermoplastic resin F20S),
Resin B: Cyclohexanedimethanol copolymerized PET (Etherman thermoplastic resin PETG6763),
Resin supply: Each resin is dried and then supplied to the extruder. The temperature of the molten resin in the extruder is set at 280 ° C. After each resin passed through a gear pump and a filter, each resin was supplied to the multi-layer feed block 11 forming a 601-layer laminate and merged to form a laminate sheet of resin A and resin B.

  Multi-layer feed block: The molten resin is discharged from the slits 16 and 17 (processing accuracy 0.001 mm) corresponding to the A layer 301 layer and the B layer 300 layer, and the lamination ratio of the molten resin A and the molten resin B is A: B = 0.95: 1 so that both surface layer portions of the laminated sheet are A layers.

  Discharge of laminated sheet: The obtained molten resin layered flow is supplied to the T-die 5 shown in FIG. 1 and formed into a sheet shape, and then electrostatically applied (DC voltage 8 kV) surface temperature 25 ° C. Was rapidly cooled and solidified on the casting drum 7.

  Surface treatment of laminated sheet: Both surfaces of cast film 8 are subjected to corona discharge treatment in the air, and the wetting tension of the surface of this film (base film) is set to 55 mN / m. Is a 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 easy to apply. A surface layer having lubricity and easy adhesion was formed.

  Heat treatment of laminated sheet: The surface-treated laminated sheet was guided to a biaxial stretching machine, preheated with hot air at a temperature of 95 ° C., and then stretched 3.5 times in the longitudinal and lateral directions. Further, heat treatment was performed with hot air at a temperature of 230 ° C., and at the same time, a relaxation treatment of 5% was performed in the vertical direction, followed by a relaxation treatment of 5% in the lateral direction.

The produced multilayer film: The wavelength of the primary reflection peak of the obtained multilayer film is 900 to 1,050 nm, the reflectance is 92%, and it efficiently reflects broadband near-infrared rays. It was an excellent colorless and transparent near-infrared filter in which almost no reflection was observed.
[Example 3]
The following values were adopted as design values for the multilayer film 31b shown in FIG.

Lamination ratio A / B of resin A and resin B: lamination ratio changing from 1/9 to 9/1,
Total number of layers: 201
The thickness of each layer of resin A (each A layer): having a distribution of 7 nm to 70 nm, and
The thickness of each layer of resin B (each B layer): Similar to each layer of resin A, it has a distribution of 7 nm to 70 nm.

  As design values of the slit plate 20 of the multilayer feed block 11 shown in FIG. 3, the slits 16 (slits A-1 to A-101) through which the resin A shown in FIG. The following values were adopted for B-1 to B-100).

Slit gap of each slit 16 corresponding to each A layer: having a distribution of 0.35 to 0.75 mm, and
Slit gap of each slit 17 corresponding to each B layer: Similar to the slit gap of each slit 16, it has a distribution of 0.35 to 0.75 mm.

  The distribution of the slit gap values of the slit 16 with respect to the resin A at this design value in the slits A-1 to A-101 is indicated by a line ASG in the upper graph (FIG. 22A) of FIG. The distribution of the slit gap values of the slit 17 relative to the resin B in the values in the slits B-1 to B-100 is indicated by a line BSG in the lower graph of FIG. 22 (FIG. 22B). The graph of FIG. 22 corresponds to the graph of FIG.

  When a multilayer film was manufactured using the multilayer feed block 11 designed in this way, a multilayer film having a thickness distribution of each layer as shown in FIG. 23 was obtained. The graph of FIG. 23 corresponds to the graph of FIG.

  Based on the measured thickness information of each A layer and each B layer of the manufactured multilayer film shown in FIG. 23, the above formula (I) is used so that the thickness of each layer matches the initial design value (target value) as much as possible. Using the relationship shown, the adjustment value of the dimension of each slit was calculated and obtained.

  Based on the value obtained by calculation using the formula (I), the slit gap of each initial slit was adjusted. After the adjustment, that is, the distribution state of the slit gap value of the slit 16 with respect to the target resin A in the slits A-1 to A-101 is indicated by a line TASG in the upper graph (FIG. 24A) of FIG. After the adjustment, that is, the distribution of the slit gap value of the slit 17 with respect to the target resin B in the slits B-1 to B-100 is indicated by a line TBSG in the lower graph of FIG. 24 (FIG. 24B). The graph of FIG. 24 corresponds to the graph of FIG. 22, and the line ASG and the line BSG in FIG. 22 are also shown in FIG.

  A multilayer film was manufactured based on the slit plate 20 having the adjusted dimensions. As shown in FIG. 25, the thickness distributions ALTD and ABLTD of each layer of the obtained multilayer film are greatly improved, and each A layer and each B layer have a thickness distribution very close to the target thickness distribution. A multilayer film was obtained. The graph of FIG. 25 corresponds to the graph of FIG.

  Although the results of Example 3 have been mainly described above, the specific method for producing the multilayer film in Example 3 is as follows.

Resin A: PET resin (Toray Industries, Inc. thermoplastic resin F20S),
Resin B: Cyclohexanedimethanol copolymerized PET (Etherman thermoplastic resin PETG6763),
Resin supply: Each resin is dried and then supplied to the extruder. The temperature of the molten resin in the extruder is set at 280 ° C. After each resin was passed through a gear pump and a filter, each resin was supplied to the multi-layer feed block 11 forming a 201-layer laminate and merged to form a laminate sheet of resin A and resin B.

  Multilayer feed block: Molten resin is discharged from slits 16 and 17 (processing accuracy 0.01 mm) corresponding to the A layer 101 layer and the B layer 100 layer, and the lamination ratio of the molten resin A and the molten resin B is A: B = 1: 9 to 9: 1 so that both surface layer portions of the laminated sheet are A layers.

  Discharge of laminated sheet: The obtained molten resin layered flow is supplied to the T-die 5 shown in FIG. 1 and formed into a sheet shape, and then electrostatically applied (DC voltage 8 kV) surface temperature 25 ° C. Was rapidly cooled and solidified on the casting drum 7.

  Surface treatment of laminated sheet: Both surfaces of cast film 8 are subjected to corona discharge treatment in the air, and the wetting tension of the surface of this film (base film) is set to 55 mN / m. Is a 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 easy to apply. A surface layer having lubricity and easy adhesion was formed.

  Heat treatment of laminated sheet: The surface-treated laminated sheet was guided to a biaxial stretching machine, preheated with hot air at a temperature of 95 ° C., and then stretched 3.5 times in the longitudinal and lateral directions. Further, heat treatment was performed with hot air at a temperature of 230 ° C., and at the same time, a relaxation treatment of 5% was performed in the vertical direction, followed by a relaxation treatment of 5% in the lateral direction.

  Produced multilayer film: The thickness of the A layer in both surface layers of the obtained multilayer film is 7 nm, the thickness of the B layer is 70 nm, the thickness of the A layer in the center of the thickness is 70 nm, and the thickness of the B layer is 7 nm. Met. Further, the thickness of the A layer monotonously increases from 7 nm to 70 nm as it goes from the surface layer portion to the center portion, while the thickness of the B layer decreases monotonously from 70 nm to 7 nm as it goes from the surface layer portion to the center portion. It was. The obtained multilayer film had a thickness of 7.8 μm and was excellent in waveguide performance.

  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 each of the above embodiments, the slit gap was adjusted based on the measured thickness information. This adjustment is performed by thermal or mechanical means as described above.

  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 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 20 of FIG. 2, and a confluence | merging part / discharge path formation member 20a. 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 front view of the slit board which adjusted the slit clearance gap of the slit board of FIG. 3 based on the lamination | stacking state of the layer shown in FIG. The front view of another example of the slit board of this invention. The cross-sectional view of the lamination sheet manufactured using the slit board of this invention of FIG. 7 and FIG. The front view of another example of the slit board of this invention. The front view of another example of the slit board of this invention. FIG. 6 is a diagram illustrating a state of a slit gap of each slit of a slit plate used in Example 3. A graph showing the distribution state of the slit gap of the slit through which the resin A before adjustment of the slit gap in Example 3 passes in relation to the slit number (upper graph in FIG. 13), and adjustment of the slit gap in Example 3 The graph which shows the distribution state of the slit clearance gap of the slit through which the front resin B passes in relation to the slit number (lower graph in FIG. 13). The measured thickness distribution of each layer made of the resin A and each layer made of the resin B of the laminated sheet manufactured using the slit plate having the slit gap distribution state shown in FIG. A graph showing the relationship. 15 is a graph (the upper graph in FIG. 15) showing the distribution state of the slit gap of the slit through which the resin A after adjustment of the slit gap in Example 3 passes, and the adjustment of the slit gap in Example 3. The graph which shows the distribution state of the slit clearance gap of the slit through which resin B later passes in relation to the slit number (lower graph in FIG. 15). The measured thickness distribution of each layer made of the resin A and each layer made of the resin B of the laminated sheet manufactured using the slit plate having the distribution state of the slit gap shown in FIG. A graph showing the relationship. The figure which shows the state of the slit clearance gap of each slit of the slit board used in Example 2. FIG. A graph showing the distribution state of the slit gap of the slit through which the resin A before adjustment of the slit gap in Example 2 passes in relation to the slit number (upper graph in FIG. 18), and adjustment of the slit gap in Example 2 The graph which shows the distribution state of the slit gap | interval of the slit which the front resin B passes in relation to a slit number (lower graph of FIG. 18). The measured thickness distribution of each layer made of the resin A and each layer made of the resin B of the laminated sheet manufactured using the slit plate having the slit gap distribution state shown in FIG. A graph showing the relationship. A graph showing the distribution of the slit gap of the slit through which the resin A after adjustment of the slit gap in Example 2 passes in relation to the slit number (upper graph in FIG. 20), and adjustment of the slit gap in Example 2 The graph which shows the distribution state of the slit clearance gap of the slit through which resin B later passes in relation to the slit number (lower graph in FIG. 20). The measured thickness distribution of each layer made of resin A and each layer made of resin B of the laminated sheet manufactured using the slit plate having the slit gap distribution state shown in FIG. 20, and the target thickness distribution as the number of layers A graph showing the relationship. The graph showing the distribution of the slit gap of the slit through which the resin A before adjustment of the slit gap in Example 3 passes (the upper graph in FIG. 22), and the adjustment of the slit gap in Example 3 The graph which shows the distribution state of the slit clearance gap of the slit through which the previous resin B passes in relation to the slit number (lower graph in FIG. 22). The measured thickness distribution of each layer made of resin A and each layer made of resin B of the laminated sheet manufactured using the slit plate having the slit gap distribution state shown in FIG. A graph showing the relationship. 24 is a graph showing the distribution state of the slit gap of the slit through which the resin A after adjustment of the slit gap in Example 3 passes in relation to the slit number (upper graph in FIG. 24), and adjustment of the slit gap in Example 3. The graph which shows the distribution state of the slit clearance gap of the slit through which resin B passes later in relation to the slit number (lower graph in FIG. 24). The measured thickness distribution of each layer made of resin A and each layer made of resin B of a laminated sheet manufactured using a slit plate having a slit gap distribution state shown in FIG. A graph showing the relationship.

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, 31a, 31b: Laminated sheet (multilayer film)
32, 32a, 32b: Layer made of resin A 33, 33a, 33b: Layer made of resin B 51: Multilayer feed block 52: Slit gap holding flexure 53: Cartridge heater 54: Heat bolt 61: Multilayer feed block 62: Slit Gap holding bending part 63: cartridge heater

Claims (18)

  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 arranged, a merging portion for joining the molten material that has passed through each of the slits so as to form the laminate, and a multilayer molten material sheet made of the molten materials laminated in the merging portion, Apparatus for deriving from the joining portion, and laminating sheet formation for solidifying each molten material of the derived multi-layer molten material sheet and forming the laminated sheet made of the plurality of types of materials formed by solidifying each molten material And a plurality of the plurality of layers based on the thickness information of the layers obtained by measuring the thickness of a desired layer of the formed laminated sheet. At least one of the flow rate adjustment is possible apparatus for producing a laminated sheet of the molten material in the slit of the slit.   The apparatus for producing a laminated sheet according to claim 1, wherein the flow rate of the molten material is adjusted by adjusting one or both of a slit gap and a slit length of the slit.   The measurement of the thickness of the said layer is performed about each layer of a lamination sheet, and adjustment of the flow volume of the said molten material is performed by adjustment of the said slit clearance gap, The manufacture of the lamination sheet of Claim 1 or 2 characterized by the above-mentioned. apparatus.   The lamination according to any one of claims 1 to 3, wherein the thickness of the layer is measured for each layer of the laminated sheet, and the flow rate of the molten material is adjusted by adjusting the slit length. Sheet manufacturing equipment.   The laminated sheet according to any one of claims 1 to 4, wherein the flow rate of the molten material is adjusted by adjusting the temperature of the molten material passing through the slit provided by adjusting the temperature of the slit. Manufacturing equipment.   The adjustment of the flow rate of the molten material is such that the slit gap of the slit corresponding to the formation of the layer located in the outer layer part in the thickness direction of the laminated sheet is larger than the slit gap of the slit corresponding to the formation of the layer located in the inner layer part. It is performed by adjusting, The manufacturing apparatus of the lamination sheet in any one of Claims 1-5 characterized by the above-mentioned.   The adjustment of the flow rate of the molten material is such that the slit length of the slit corresponding to the formation of the layer located in the outer layer portion in the thickness direction of the laminated sheet is shorter than the slit length of the slit corresponding to the formation of the layer located in the inner layer portion. It is performed by adjusting, The manufacturing apparatus of the lamination sheet in any one of Claims 1-6 characterized by the above-mentioned.   The flow rate of the molten material is adjusted by mechanically or thermally adjusting one or both of a slit gap and a slit length with respect to at least one slit of the plurality of slits. The manufacturing apparatus of the lamination sheet in any one of claim | item 1 -7. The thickness measurement value of an arbitrary layer x in the thickness direction of the laminated sheet is T (x), the slit gap corresponding to this thickness measurement value is d (x), the slit length is L (x), and the layer x When the target thickness is Ta (x), the target slit gap corresponding to this target thickness is da (x), and the target slit length is La (x), the following formula Ta (x) / T (x)
= [La (x) / L (x)] × [d (x) ³ / da (x) ³ ]
The apparatus for producing a laminated sheet according to any one of claims 1 to 8, wherein the flow rate of the molten material is adjusted for the slit corresponding to the layer x so as to satisfy the relationship.   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 layer obtained by measuring the thickness of a desired layer of the formed laminated sheet when the molten material that has passed through each slit is joined so as to form the laminated layer. Based on the thickness information, the flow rate of the molten material in at least one of the plurality of slits is adjusted for each slit.   The method for producing a laminated sheet according to claim 10, wherein the flow rate of the molten material is adjusted by adjusting one or both of a slit gap and a slit length of the slit.   The method for producing a laminated sheet according to claim 10 or 11, wherein the thickness of the layer is measured for each layer of the laminated sheet, and the flow rate of the molten material is adjusted by adjusting the slit gap.   The method for producing a laminated sheet according to claim 10, wherein the thickness of the layer is measured for each layer of the laminated sheet, and the flow rate of the molten material is adjusted by adjusting the slit length.   The method for producing a laminated sheet according to claim 10, wherein the flow rate of the molten material is adjusted by adjusting the temperature of the molten material passing through the slit provided by adjusting the temperature of the slit.   Adjusting the flow rate of the molten material, the slit gap of the slit corresponding to the formation of the layer located in the outer layer part in the thickness direction of the laminated sheet is larger than the slit gap of the slit corresponding to the formation of the layer located in the inner layer part. It performs by adjusting, The manufacturing method of the lamination sheet in any one of Claims 10-14 characterized by the above-mentioned.   Adjusting the flow rate of the molten material, the slit length of the slit corresponding to the formation of the layer located in the outer layer portion in the thickness direction of the laminated sheet is shorter than the slit length of the slit corresponding to the formation of the layer located in the inner layer portion. It performs by adjusting, The manufacturing method of the lamination sheet in any one of Claims 10-15 characterized by the above-mentioned.   The flow rate of the molten material is adjusted by mechanically or thermally adjusting one or both of a slit gap and a slit length with respect to at least one slit of the plurality of slits. The manufacturing method of the lamination sheet in any one of 10-16. The thickness measurement value of an arbitrary layer x in the thickness direction of the laminated sheet is T (x), the slit gap corresponding to this thickness measurement value is d (x), the slit length is L (x), and the layer x When the target thickness is Ta (x), the target slit gap corresponding to this target thickness is da (x), and the target slit length is La (x), the following formula Ta (x) / T (x)
= [La (x) / L (x)] × [d (x) ³ / da (x) ³ ]
The method for producing a laminated sheet according to any one of claims 10 to 17, wherein the flow rate of the molten material is adjusted for the slit corresponding to the layer x so as to satisfy the above relationship.

Images