JP2006130744A - Manufacturing method of non-stretched film, manufacturing method of resin coated metal sheet and manufacturing apparatus of non-stretched film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a non-stretched film comprising a thermoplastic resin produced by a multikind and small-quantity production system, a manufacturing method of a resin coated metal sheet produced by coating, a metal sheet with the thermoplastic resin produced by the multikind and small-quantity production system, and a method for manufacturing the non-stretched film comprising the thermoplastic resin by the multikind and small-quantity production system in a high yield. <P>SOLUTION: A thermoplastic resin A and a separate thermoplastic resin B other than the thermoplastic resin A used for the purpose of forming the non-stretched film are separately heated and melted to be guided to both end parts of an extrusion T-die and discharged from the T-die so that the thermoplastic resins B are provided in parallel on both sides of the heated molten thermoplastic resin A to be extruded on a casting roll to form the non-stretched film wherein the thermoplastic resins B are provided in parallel on both sides of the heated molten thermoplastic resin A before the part of the thermoplastic resin B is cut off. In this manufacturing method of the non-stretched film, the thermoplastic resin A is discharged so as to cover the thermoplastic resin B with the thermoplastic resin A and extruded on the casting roll to form the non-stretched film and the part of the thermoplastic resin B covered with the thermoplastic resin A is cut off to form the target non-stretched film only comprising the thermoplastic resin A. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for producing an unstretched film made of a thermoplastic resin, a method for producing a fat-coated metal plate laminated with a thermoplastic resin, and an apparatus for producing an unstretched film made of a thermoplastic resin.

  As a film made of a thermoplastic resin, a resin melted by heating in an extruder is discharged from a T-die, extruded onto a casting roll, wound in a coil shape, and used after being extruded onto a casting roll. A uniaxially stretched film formed by stretching in the longitudinal direction or a biaxially stretched film formed by stretching in the longitudinal direction and the width direction is formed. In any of these films, a film discharged from a T-die and extruded onto a casting roll is formed into a film that is solidified on the casting roll at both ends thicker than the center as a characteristic of a high-viscosity molten resin. Therefore, both end portions are cut and removed in order to obtain a film having a certain thickness in the width direction. When producing a large number of films having the same resin composition, the thick portion of the resin that has been cut and removed is reused by being heated and melted again in the extruder as the raw material of the film. In the case of producing a variety of films in small quantities, in order to use the thick part cut and removed again as a raw material of the film, it can be used only when the film is formed again, which is a bottleneck for improving the yield.

  As a method for removing both ends in the width direction of the resin film, for example, a trimming method described in Patent Document 1 has been proposed. In this method, when the molten resin is extruded and coated on both sides of the metal plate substrate, the resin part (ear part) protruding from the width direction of the metal plate is sandwiched with an endless guide belt before the resin cools. This is a method of removing by stripping. In the use of this method, since various kinds of pigments and fillers are used in the resin, it can be used only for limited purposes in order to use the cut and removed portion again as a raw material for the film. When forming a film to be produced, improvement in yield cannot be expected. In addition, it is difficult to speed up the production line.

  As a method of reducing the economic loss of film trimming waste that cannot be reused, the method described in Patent Document 2 has been proposed. This method relates to a film having a high quality requirement such as an electrically insulating film made of a biaxially stretched polypropylene film used for producing a capacitor. The propylene polymer B is heated and melted in a first extruder. When the propylene polymer A is heated and melted and extruded together from a flat sheet die in the extruder of No. 2, the propylene polymer A is supplied on both sides of the propylene polymer B, extruded, biaxially stretched, and then on both sides of the propylene polymer B In this method, the propylene polymer A having a high quality requirement is used as effectively as possible by cutting and removing the propylene polymer A in order to avoid waste as film trimming. However, in this method, the properties of the propylene polymer B to be used must be set to match these properties of the propylene polymer A with respect to the properties of the propylene polymer B such as molecular weight, residual ash, melt flow index, and melting point. The use is limited, and it cannot be applied to film formation of various general-purpose thermoplastic resins.

Prior art document information relating to the present application includes the following.
Japanese Patent Laid-Open No. 2002-127099 Japanese Patent Application Laid-Open No. 08-336884

  The present invention relates to a method for producing an unstretched film made of a thermoplastic resin produced in a small variety and a variety, a method for producing a resin-coated metal plate coated with a thermoplastic resin produced in a variety and a small variety, and a production in a variety of a variety An object of the present invention is to provide a method for producing an unstretched film made of a thermoplastic resin with a high yield.

The method for producing an unstretched film of the present invention that solves the above problems separately heats a thermoplastic resin A intended to be formed as an unstretched film and another thermoplastic resin B other than the thermoplastic resin A. It is melted and guided to both ends of the extrusion T-die, and the thermoplastic resin B is discharged on both sides of the thermoplastic resin A that has been heated and melted and extruded onto a casting roll. In the method for producing an unstretched film, the thermoplastic resin portion is cut and removed after forming the unstretched film in which the thermoplastic resin B coexists on both sides of A. A method for producing an unstretched film (Claim 1), wherein the thermoplastic resin A is discharged so as to cover the thermoplastic resin B and extruded onto a casting roll.
In the method for producing an unstretched film according to (Claim 1), the thermoplastic resin A and the another thermoplastic resin B are heated and melted in separate extruders and connected to the respective extruders. On the both sides of the lower part of the pipe for supplying the thermoplastic resin A, the cross-sectional shape is parallel to the flow direction of the molten resin and the short axis is the flow direction of the molten resin. Holes having an elliptical shape which is a right angle direction were drilled, and heated and melted in a feed block formed by continuously connecting the ends of the pipes supplying the thermoplastic resin B to the holes drilled on both sides thereof. The thermoplastic resin A and the thermoplastic resin B are supplied, and then widened by a manifold connected to the feed block, and the thermoplastic resin B coexists on both sides of the thermoplastic resin A. The die lip of the T-die for extrusion And a non-stretched film manufacturing method characterized by extruding onto a casting roll (Claim 2), and in the non-stretched film manufacturing method of (Claim 1 or 2), The thermoplastic resin B is characterized by using a thermoplastic resin whose viscosity at the time of heating and melting is higher than that of the thermoplastic resin A (Claim 3), and any of the above (Claims 1 to 3). In the film production method, when the thermoplastic resin A and the thermoplastic resin B are discharged from the extrusion T-die, the thermoplastic resin B is unavoidable than the thickness of the thermoplastic resin A. And forming the unstretched film so as to have only a thickened portion (Claim 4), and in the method for producing an untrusted stretch film according to any one of the above (Claims 1 to 4). , As the thermoplastic resin B, and wherein the use of colored thermoplastic resin (claim 5).

Further, the method for producing a resin-coated metal plate of the present invention comprises the steps of extruding a thermoplastic resin A intended to be laminated and coated on a metal plate and another thermoplastic resin B other than the thermoplastic resin by separately heating and melting them. It is guided to both ends of the T-die for use and discharged so that the thermoplastic resin A coexists on both sides of the heat-melted thermoplastic resin A and the width of the portion of the thermoplastic resin A is larger than the width of the metal plate. After extruding onto the metal plate, only the portion of the thermoplastic resin A is formed into a resin-coated metal plate in which the metal plate is laminated and coated, and then the resin portion protruding from both ends of the metal plate is cut and removed. In the method for producing a resin-coated metal plate, the resin-coated metal plate, wherein the thermoplastic resin A is discharged so as to cover the thermoplastic resin B and is extruded onto a casting roll. Manufacturing method ( It is a Motomeko 6),
In the method for producing a resin-coated metal plate according to (Claim 6), a thermoplastic resin having a viscosity at the time of heating and melting higher than that of the thermoplastic resin A is used as the thermoplastic resin B (Claim 7). In the method for producing a resin-coated metal plate according to the above (Claim 6 or 7), when the thermoplastic resin A and the thermoplastic resin B are discharged from the extrusion T-die, The thermoplastic resin B coexisting on both sides of the thermoplastic resin A is extruded onto the metal plate so as to be only a portion inevitably thicker than the thickness of the thermoplastic resin A (claim) Item 8), and in the method for producing a resin-coated metal plate according to any one of the above (Claims 6 to 8), a colored thermoplastic resin is used as the thermoplastic resin B (Claim 9). Is a feature.

  Moreover, the manufacturing apparatus of the unstretched film of this invention is an extruder (A1) which heat-melts the thermoplastic resin A aiming at forming into a film as an unstretched film, and other than the said thermoplastic resin A. An extruder (B1) for heating and melting the thermoplastic resin B, a molten resin supply pipe (A2) connected to the extruder (A1), and a molten resin supply connected to the extruder (B1) And two holes B3a formed on both sides of the lower portion of the molten resin supply tube (A2) and connected to the molten resin supply tube (B2). In the non-stretched film manufacturing apparatus, the hole B3a includes a feed block made of B3b, a manifold and a T-die having a die lip connected to the manifold and connected to the feed block. And B3b cross-sectional shape Major axis and wherein the short axis in the flow direction and parallel to the direction of the molten resin is elliptical is the flow direction perpendicular to the direction of the molten resin, a manufacturing apparatus of a resin-coated metal sheet.

  The method for producing an unstretched film of the present invention is a method for producing an unstretched film in which a thermoplastic resin is heated and melted, discharged from a T-die for extrusion, and extruded onto a casting roll to form a film as an unstretched film. The thermoplastic resin A intended to be used and another thermoplastic resin B other than the thermoplastic resin are separately heated and melted to be led to both ends of the extrusion T-die, on both sides of the heated and melted thermoplastic resin A. When forming into an unstretched film in which the thermoplastic resin B coexists on both sides of the target thermoplastic resin A by discharging it so that another thermoplastic resin B coexists and extruding it onto a casting roll. Since the thermoplastic resin A is discharged so as to cover the thermoplastic resin B having a high viscosity when heated and melted and extruded onto the casting roll, the high-viscosity thermoplastic resin B is used as an auxiliary roll. It is possible to form a film continuously without being in contact with the throat, and after being extruded onto a casting roll, the film is inevitably thicker than the desired thermoplastic resin A part. Since the portion of the thermoplastic resin B coated with the thermoplastic resin A is cut and removed, the amount of the desired thermoplastic resin A to be removed is small, so that films with different resin compositions are produced in small quantities and in many varieties. An unstretched film made of a thermoplastic resin for the purpose can be produced with a high yield without causing troubles in film formation such as adhesion. Further, the line speed has been conventionally 50 m / m, but according to the present invention, it has become possible to produce at a high speed of 150 to 200 m / min.

  The method for producing a resin-coated metal plate of the present invention is a method for producing a resin-coated metal plate in which a thermoplastic resin is heated and melted, discharged from a T-die for extrusion, and extruded onto the metal plate to be laminated and coated. The thermoplastic resin A intended to be laminated and coated and another thermoplastic resin B other than the thermoplastic resin A are separately heated and melted and led to both ends of the extrusion T-die, and the target is heated and melted. The thermoplastic resin A coexists on both sides, and the thermoplastic resin portion is discharged so that the width of the portion of the thermoplastic resin is larger than the width of the metal plate. When making a resin-coated metal plate laminated and coated on a metal plate, casting is performed by coating the target thermoplastic resin A so as to cover another thermoplastic resin B having a high viscosity when heated and melted and a high melt tension. To push onto the roll The high-viscosity thermoplastic resin B does not come into contact with the auxiliary roll and adheres to it, and can be continuously extruded and coated on a metal plate at a high speed, and after being extruded onto a casting roll, Since the thermoplastic resin B portion coated with the target thermoplastic resin A, which is inevitably thicker than the target thermoplastic resin A portion protruding from both ends of the metal plate, is cut and removed. Since the entire surface of the metal plate is coated with a small amount of the thermoplastic resin A removed, the resin-coated metal plate can be produced with almost no loss of the target thermoplastic resin A.

  The unstretched film production apparatus of the present invention includes an extruder (A1) for heating and melting the thermoplastic resin A for the purpose of forming an unstretched film, and another thermoplastic resin other than the thermoplastic resin. An extruder (B1) for heating and melting the resin B, a molten resin supply pipe (A2) connected to the extruder (A1), and a molten resin supply pipe connected to the extruder (B1) (B2) and a feed consisting of two holes B3a and B3b drilled on both sides of the lower part of the molten resin supply pipe (A2) and connected to the molten resin supply pipe (B2) In a non-stretched film manufacturing apparatus comprising a block, a manifold, and a die lip connected to the manifold, and a T-die connected to the feed block, the cross-sectional shape of the holes B3a and B3b is The long axis is made of molten resin Another thermoplastic resin having a high viscosity at the time of heat-melting and a high melt tension with the target thermoplastic resin A by forming an elliptical shape in which the minor axis is parallel to the flow direction and the minor axis is perpendicular to the flow direction of the molten resin Since discharging is performed so as to cover B, the high-viscosity thermoplastic resin B does not come into contact with an auxiliary roll or the like, and can be continuously extruded and coated on a metal plate at a high speed. In addition, after forming an unstretched film in which the thermoplastic resin B coexists on both sides of the target thermoplastic resin A, the thermoplastic resin is inevitably formed thicker than the target thermoplastic resin A portion. Since the B portion is cut and removed, the amount of the desired thermoplastic resin A to be removed is small, so that an unstretched film made of a thermoplastic resin for the purpose of producing various types of films with different resin compositions in small quantities. And without causing troubles on film, such as adhesive, it can be produced in high yield.

  Hereinafter, the present invention will be described in detail. The non-stretched film manufactured using the manufacturing method of this invention aims at producing a small amount of films with different resin compositions in small quantities using a small number of manufacturing apparatuses. Examples of the thermoplastic resin A to be formed on the desired unstretched film include low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, polybutene, which are 1-alkene copolymer resins having 2 to 8 carbon atoms. 1, consisting of one or more of polypentene-1, polyhexene-1, polyheptene-1, polyoctene-1, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-hexene copolymer, etc. Polyamide resins such as polyolefin resin, 6-nylon, 6,6-nylon, 6,10-nylon, terephthalic acid, isophthalic acid, orthophthalic acid, P-β-oxyethoxybenzoic acid, naphthalene-2,6- Dicarboxylic acid, diphenoxyethane-4,4-dicarboxylic acid, 5-sodium sulfoi Dibasic aromatic dicarboxylic acids such as phthalic acid, alicyclic dicarboxylic acids such as hexahydroterephthalic acid and cyclohexanedicarboxylic acid, aliphatic dicarboxylic acids such as adipic acid, sebacic acid and dimer acid, trimellitic acid and pyromellitic acid , Hemilimit acid, 1,1,2,2-ethanetetracarboxylic acid, 1,1,2-ethanetricarboxylic acid, 1,3,5-pentanetricarboxylic acid, 1,2,3,4-cyclopentanetetracarboxylic acid , An acid composed of one or two or more polybasic acids such as biphenyl-3,4,3 ′, 4′-cyclopentanetetracarboxylic acid, and ethylene glycol, propylene glycol, 1,4 as an alcohol component -Butanediol, neopentyl glycol, 1,6-hexylene glycol, diethylene glycol, trie Diols such as tylene glycol and cyclohexanedimethanol, and polyvalent such as pentaerythritol, glycerol, trimethylolpropane, 1,2,6-hexanetriol, sorbitol, 1,1,4,4-tetrakis (hydroxymethyl) cyclohexane A polyester resin composed of one kind or two or more kinds of alcohols can be used.

  As the thermoplastic resin B different from the target thermoplastic resin A that coexists at both ends of the target thermoplastic resin A, a resin that is less expensive than the target thermoplastic resin A from the viewpoint of cost. Is preferably used. Further, it is necessary to continuously and stably form an unstretched film of the desired thermoplastic resin A without causing trouble. As shown in FIG. 1, when the thermoplastic resin is extruded and laminated on both sides of the metal plate 30, the target thermoplastic resin A and the other thermoplastic resins B at both ends thereof are discharged from the T die 2. Before being laminated on the metal plate 30 by the coating roll 40 that also serves as a caste puffer roll, the auxiliary roll 50 may be contacted. The coating roll 40 and the auxiliary roll 50 are made of a material that does not adhere to the target thermoplastic resin A that has been heated and melted. However, another thermoplastic resin B that has been heated and melted may depend on the resin used. 40 and the auxiliary roll 50 may be stuck and wound, making it impossible to continuously perform the laminating operation. Therefore, as will be described later, in the present invention, as shown in the cross section of the resin film to be formed in FIG. 2, another thermoplastic resin B at both ends of the target thermoplastic resin A is a coating roll 40 or an auxiliary roll. Another thermoplastic resin B is coated with the thermoplastic resin A so as not to be in direct contact with 50. For this purpose, it is preferable to use a thermoplastic resin having a higher viscosity at the time of heating and melting than the thermoplastic resin A as the other thermoplastic resin B. It is possible to use a combination of the thermoplastic resin A and a thermoplastic resin B different from the intended thermoplastic resin A coexisting at both ends.

  Next, a method for forming a film so that another thermoplastic resin B coexists on both ends of the target thermoplastic resin A using the method and apparatus for producing an unstretched film of the present invention will be described. FIG. 3 is a schematic view of the unstretched film production apparatus 10 of the present invention. The target thermoplastic resin A is heated and melted by the extruder A1, and is supplied to the feed block 1 through a pipe A2 for supplying the molten resin of the target thermoplastic resin A connected to the extruder A1. Another thermoplastic resin B coexisting at both ends of the thermoplastic resin A is heated and melted by the extruder B1, connected to the extruder Bl, and supplied for the molten resin of the two thermoplastic resins B branched in the middle. It is supplied to the feed block 1 through the pipe B2. A pipe A2 for supplying a molten resin of the thermoplastic resin A passes through the feed block 1, and is connected to the T die 2 at the lowermost part thereof. Further, holes B3a and B3b are formed on both sides of the lower part of the pipe A2 for supplying the molten resin of the thermoplastic resin A in the feed block 1, and the holes of the thermoplastic resin B are formed in the holes B3a and B3b. Pipes B <b> 2 for supplying molten resin are continuously provided through the feed block 1.

  The thermoplastic resin A heated and melted by the extruder A1 is supplied to the feed block 1 through the molten resin supply pipe A2, and is pushed out toward the T die 2 connected to the lowermost part thereof. The thermoplastic resin B heated and melted by the extruder B1 is supplied to the feed block 1 through the molten resin supply pipe B2, and the holes B3a formed on both sides of the lower part of the molten resin supply pipe A2 and The thermoplastic resin B is extruded from the hole B3b into the molten resin supply pipe A2 so that both ends of the thermoplastic resin A coexist. Next, it is widened by a manifold 6 provided inside the T die 2 and discharged from a die lip 3 onto a casting roll 4 arranged below the T die 2. At this time, both end portions in the width direction of the molten resin film discharged are inevitably thicker than other portions. Therefore, it forms into the unstretched film 20 in which the thermoplastic resin B whose film thickness is thicker than the thermoplastic resin A coexists on both ends of the thermoplastic resin A.

  In view of ease of processing at the time of manufacture, when the molten resin supply pipe A2 and the molten resin supply pipe B2 are respectively circular pipes, the lowermost part of the molten resin supply pipe A2 immediately before the T-die 2 In FIG. 4, the thermoplastic resin B coexists in a cross-sectional shape as shown in FIGS. 4 to 6 at both ends of the thermoplastic resin A according to the difference in viscosity between the thermoplastic resin A and the thermoplastic resin B. 4 to 6 show the molten resin supply pipe A2 in the feed block 1 and the molten resin from the hole B3a and the hole B3b formed on both sides of the lower part of the molten resin supply pipe A2 to the T die 2. It is a schematic diagram which shows the state of the thermoplastic resin A and the thermoplastic resin B just before extrusion, and the state discharged from the T die 2 and formed into an unstretched film, and the upper part of the figure is the pipe A2 for supplying molten resin Sectional drawing which shows the state of the thermoplastic resin A and the thermoplastic resin B in a lower part, The lower part of a figure shows the state of the cross section of the unstretched film after discharging from the T die 2 and forming into a film.

  When the melt viscosity of another thermoplastic resin B is extremely lower than the melt viscosity of the desired thermoplastic resin A, the thermoplastic resin B is present at both ends of the thermoplastic resin A in the cross-sectional shape shown in the upper part of FIG. In this state, when it is widened by the manifold 6 and discharged from the die lip 3 of the T die 2, the so-called thermoplastic resin B has entered the upper and lower ends of the end portion of the thermoplastic resin A as shown in the lower part of FIG. A wrap portion 5 is formed.

  When the melt viscosity of another thermoplastic resin B is higher than the melt viscosity of the desired thermoplastic resin A, the thermoplastic resin B coexists in the cross-sectional shape shown in the upper part of FIG. In this state, when it is widened by the manifold 6 and discharged from the die lip 3 of the T die 2, the wrap portion 5 in which the thermoplastic resin A enters above and below the end portion of the thermoplastic resin B as shown in the lower part of FIG. Is formed.

  These wrap portions 5 must be removed because they cannot be adopted as products in the portion where the thermoplastic resin A and the thermoplastic resin B overlap, but if the wrap portion 5 is large, the removal portion increases, Thus, the yield of the thermoplastic resin A is reduced. Therefore, it is necessary to select a combination of the thermoplastic resin A and the thermoplastic resin B so as to minimize the wrap portion of the thermoplastic resin A and the thermoplastic resin B, but the thermoplastic resin A is a target resin. Therefore, in practice, the thermoplastic resin B suitable for the thermoplastic resin A is selected. As described above, since the apparatus required for film formation, such as a casting roll, a coating roll, and an auxiliary roll, is made of a material suitable for the target thermoplastic resin A, the thermoplastic resin B selected as a combination is used. When heated and melted, it sticks to and rolls around each of these rolls, making continuous film formation impossible.

  In the present invention, as shown in FIG. 5, a resin having a melt viscosity higher than the melt viscosity of the target thermoplastic resin A is used as another thermoplastic resin B, and the thermoplastic resin B shown in the lower part of FIG. By further intruding the wrap part 5 in which the thermoplastic resin A has entered the upper and lower ends of each of the ends, and covering with the thermoplastic resin A over the entire width of the thermoplastic resin B, as shown in the lower part of FIG. The thermoplastic resin B is prevented from directly sticking to and sticking to a casting roll, a coating roll, an auxiliary roll and the like.

  For this purpose, a thermoplastic resin having a higher melt viscosity than that of the target thermoplastic resin A is used as another thermoplastic resin B, and the thermoplastic resin A in the feed block 1 shown in FIG. The cross-sectional shape of the hole B3a and the hole B3b where the molten resin supply pipe B2 of the thermoplastic resin B on both sides of the resin supply pipe A2 merges, the long axis is parallel to the flow direction of the molten resin and the short axis is molten An elliptical feed block that is perpendicular to the resin flow direction is used. As shown in the figure, in the feed block 1, when the molten resin supply pipe B2 is communicated with the molten resin supply pipe A2 of the thermoplastic resin A from an oblique direction, the holes B3a and B3b of the joining portion The cross-sectional shape is an elliptical shape in which the long axis is parallel to the flow direction of the molten resin and the short axis is perpendicular to the flow direction of the molten resin, and the angle in the oblique direction that connects the molten resin supply pipe B2 is adjusted. Thereby, the coating state of the thermoplastic resin B by the thermoplastic resin A can be adjusted. Further, a heater and a temperature sensor are provided around the molten resin supply pipe A2, the molten resin supply pipe B2, the feed block 1, and the manifold 6 of the T die 2, and the heating temperature is adjusted using the temperature adjusting means. The thermoplastic resin B is heated to a high temperature, the thermoplastic resin A is heated to a low temperature, and the melt viscosity of the thermoplastic resin B when passing through the feed block and the T die is higher than the melt viscosity of the thermoplastic resin A. By doing so, the covering state can be adjusted.

  Moreover, in order to make it easy to confirm the wrap part 5, it is preferable to use another thermoplastic resin B by coloring it with a colored pigment. When the thermoplastic resin A is a colored resin, it is preferable that the thermoplastic resin B contains a colored pigment having a color different from the color of the thermoplastic resin A or is used as a transparent resin containing no pigment.

  Next, the method for producing the resin-coated metal plate of the present invention will be described. FIG. 8 shows a laminate on which a thermoplastic resin B is extruded from the die lip 3 of the T die 1 so that both ends of the thermoplastic resin A coexist on the metal plate 30 that continuously proceeds from top to bottom in the figure. It is a schematic plan view which shows the case where the case where it coat | covers is seen from the upper direction of a metal plate. As the T die 1, a T die in which the discharge width of the die lip 3 is larger than the width of the metal plate 30 is used. Until the thermoplastic resin A and the thermoplastic resin B are discharged from the die lip 3 of the T die 1, the film is formed into a molten film by the same operation as in the production of the unstretched film of the present invention. The thermoplastic resin A coated with the thermoplastic resin A (A + B), which is inevitably thicker than the thermoplastic resin A, is formed on both sides of the thermoplastic resin A. The metal plate 30 is laminated and coated by discharging onto the metal plate 30 such that the width is larger than the width of the metal plate 30. The hatched portion in the figure indicates a portion where the metal plate 30 is laminated and coated with the thermoplastic resin A. In this way, the metal plate 30 was laminated and covered only with the portion of the thermoplastic resin A to form the resin-coated metal plate 60, and then protruded outside the both ends of the thermoplastic resin (A + B) and the thermoplastic resin A metal plate 30. The portion is cut and removed using cutting means 15 such as a cutter. In this way, the entire width of the metal plate 30 is laminated and coated only with the thermoplastic resin A intended for uniform thickness. Further, by controlling the extrusion amount of the thermoplastic resin A so that the portion of the thermoplastic resin A that protrudes outside both ends of the metal plate 30 is minimized, the resin coating can be performed without almost losing the target thermoplastic resin A. A metal plate can be manufactured.

  As described above, the case where another thermoplastic resin B coexists on both ends of the target thermoplastic resin A as a single layer has been shown. In the method for producing a multilayer thermoplastic resin using the multi-manifold method, However, by applying the technology of the present invention, a plurality of target thermoplastic resins A are separately heated and melted, and another thermoplastic resin B is added to each resin of the thermoplastic resin A group immediately before widening with each manifold. Are fed to each multi-manifold so that another thermoplastic resin B coexists on both ends of each thermoplastic resin A, and then merged, and then from the die lip of the T die onto the casting roll It is also possible to cut and remove the portion of the thermoplastic resin B covered with the thermoplastic resin A group after discharging to form a multilayer unstretched film.

Hereinafter, the present invention will be described in more detail with reference to examples.
Example 1
Polyester resin (ethylene terephthalate / ethylene isophthalate copolymer (ethylene isophthalate 10 mol%), melting point: 220 ° C.) is used as the thermoplastic resin A for the purpose of forming an unstretched film using an extruder A1. Extruder is a resin in which 25% by weight of TiO ₂ as a coloring component is added to low density polyethylene (melting point: 145 ° C.) as thermoplastic resin B which is melted by heating to 260 ° C. and coexists on both ends of thermoplastic resin A It melted by heating to 200 ° C. using B1. Next, the thermoplastic resin A heated and melted from the extruder A1 is passed through one molten resin supply pipe A2 heated to 260 ° C. with an adjacent heater, and the thermoplastic resin B heated and melted from the extruder B1 is It was supplied to the feed block 1 through two molten resin supply pipes B2 each heated to 200 ° C. by adjacent heaters. A molten resin supply pipe A2 passes through the center of the feed block 1, and the molten resin supply pipe B2 is obliquely upward at an angle of 50 ° with respect to the resin supply direction of the pipe A2 on both sides of the lower part thereof. The thermoplastic resin B is melted from the hole B3a and the hole B3b in which the long axis is parallel to the flow direction of the molten resin and the short axis is perpendicular to the flow direction of the molten resin. It was extruded into the supply pipe A2 so that the thermoplastic resin B coexists on both ends of the thermoplastic resin A. Next, the width of the portion of the thermoplastic resin A after film formation is about 80 cm, and the width of the portions of the thermoplastic resin B coated with the thermoplastic resin A at both ends of the thermoplastic resin A is about 10 cm. The die 6 is widened by a manifold 6 provided inside the die 2, and dropped from a die lip 3 disposed below the T die 2 onto a casting roll (cooling roll) 4 that continuously rotates via an auxiliary roll, and then cooled and solidified. And formed into a resin film having a width of about 1 m. In the film thus formed, a wrap portion 5 in which the entire width of the thermoplastic resin B as shown in FIG. 2 is coated with the thermoplastic resin is formed, and the thermoplastic resin B adheres to the auxiliary roll. The film could be formed without winding. Next, the wrap portion 5 of the thermoplastic resin B coated with the thermoplastic resin A was cut and removed by using a cutter, and wound around a coiler as an unstretched resin film having a width of 78 cm made of only the thermoplastic resin A.

(Example 2)
In the film forming apparatus used for forming the resin film of Example 1, zinc having a length of 0.3 mm and a width of 75 cm which is continuously unwound from an uncoiler as a metal plate instead of the cooling roll 4 is supplied. A plated steel plate is passed, and the same thermoplastic resin A and thermoplastic resin B as in Example 1 are heated and melted on this galvanized steel plate in the same manner as in Example 1, and the thermoplastic resin is bonded to both ends of the thermoplastic resin A. It was discharged onto the galvanized steel sheet from the die lip 3 disposed below the T die 2 so that B coexists, and was laminated and coated. The resin film in which the thermoplastic resin B coexists on both ends of the thermoplastic resin A thus discharged has a width of the thermoplastic resin A portion of about 80 cm, and the thermoplastic resin B portions on both ends of the thermoplastic resin A. The total width of each of about 10 cm is about 1 m, and a part of the thermoplastic resin A and the thermoplastic resin B coated with the thermoplastic resin A protrude from both ends in the width direction of the galvanized steel sheet. The protruding resin portion was cut and removed with a cutter, and the entire surface of the galvanized steel sheet was wound around a coiler as a resin-coated galvanized steel sheet with the thermoplastic resin A being laminated and coated.

When forming a non-stretched film using the method and apparatus for producing a non-stretched film of the present invention, the target thermoplastic resin A is coated with another thermoplastic resin B having a high viscosity at the time of heating and melting. Since it discharges and it extrudes on a casting roll, it can form into a film continuously, without the high viscosity thermoplastic resin B contacting an auxiliary roll etc. and sticking. In addition, since the portion of the thermoplastic resin B covered with the target thermoplastic resin A is cut and removed after being extruded onto the casting roll, the amount of the target thermoplastic resin A to be removed becomes small. An unstretched film made of the thermoplastic resin A for the purpose of producing various kinds of different films in small quantities can be produced at a high yield without causing troubles in film formation such as adhesion. Moreover, although the line speed was 50 m / m conventionally, it became possible to manufacture at a high speed of 150 to 200 m / min.
In addition, the resin-coated metal plate formed using the method for producing a resin-coated metal plate of the present invention is a resin-coated metal plate in which only a portion of the desired thermoplastic resin A is laminated and coated on the metal plate. Since the portion of the other thermoplastic resin B coated with the desired thermoplastic resin A that protrudes from both ends of the plate is cut and removed, the amount of the desired thermoplastic resin A is reduced and the entire surface of the metal plate is removed. Since it is coated, the desired thermoplastic resin A can be produced in a variety of small quantities at a low cost with almost no loss.

Schematic which shows the state which laminates | stacks a resin film on a metal plate. Sectional drawing of the unstretched film manufactured using the manufacturing method of the unstretched film of this invention. Schematic which shows the manufacturing method of the unstretched film of this invention. Schematic which shows the state of the thermoplastic resin just before extruding to T-die, and the state formed into the film. Schematic which shows the state of the thermoplastic resin just before extruding to T-die, and the state formed into the film. Schematic which shows the state of the thermoplastic resin just before extruding to T-die, and the state formed into the film. The schematic diagram which shows the state of the thermoplastic resin just extruded to T die | dye of this invention, and the state formed into the film. The schematic plan view which shows the manufacturing method of the resin coating metal plate of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Feed block 2 T die 3 Die lip 4 Casting (cooling) roll 5 Lapping part 6 Manifold 10 Unstretched film manufacturing apparatus 15 Cutting means 20 Unstretched film 30 Metal plate 40 Coating roll 50 Auxiliary roll 60 Resin coated metal plate A Heat Plastic resin B Thermoplastic resin A1 Extruder A2 Molten resin supply pipe A2R Molten resin supply pipe and T-die connection B1 Extruder B2 Molten resin supply pipe B3a Hole B3b Hole

Claims (10)

  The thermoplastic resin A intended to be formed as an unstretched film and another thermoplastic resin B other than the thermoplastic resin A are separately heated and melted, led to both ends of the extrusion T-die, and heated and melted. The thermoplastic resin B is discharged so that the thermoplastic resin B coexists on both sides of the thermoplastic resin A and is extruded onto a casting roll, and the thermoplastic resin B coexists on both sides of the thermoplastic resin A. In the method for producing an unstretched film, the thermoplastic resin portion is discharged so as to cover the thermoplastic resin B with the thermoplastic resin A after the film is formed on the stretched film. And then extruding it onto a casting roll.   The thermoplastic resin A and the other thermoplastic resin B are heated and melted by separate extruders, and supplied to the molten resin supply pipes connected to the respective extruders. On both sides of the lower part of the pipe for supplying A, holes having an elliptical shape in which the major axis is parallel to the flow direction of the molten resin and the minor axis is perpendicular to the flow direction of the molten resin, The thermoplastic resin A and the thermoplastic resin B, which are heated and melted, are supplied to a feed block formed by connecting end portions of pipes for supplying the thermoplastic resin B to holes formed on both sides of the thermoplastic resin B. Next, it is widened by a manifold connected to the feed block, and extruded from the die lip of the extrusion T-die onto the casting roll in a state where the thermoplastic resin B coexists on both sides of the thermoplastic resin A. Characterized by Method for producing a non-stretched film according to Motomeko 1.   The method for producing an unstretched film according to claim 1 or 2, wherein a thermoplastic resin having a higher viscosity at the time of heating and melting than the thermoplastic resin A is used as the thermoplastic resin B.   When the thermoplastic resin A and the another thermoplastic resin B are discharged from the extrusion T die, the thermoplastic resin B is inevitably thicker than the thermoplastic resin. The method for producing an unstretched film according to any one of claims 1 to 3, wherein the unstretched film is formed so that only the unstretched film is formed.   The method for producing an unstretched film according to claim 1, wherein a colored thermoplastic resin is used as the thermoplastic resin B.   The thermoplastic resin A intended to be laminated and coated on a metal plate and another thermoplastic resin B other than the thermoplastic resin are separately heated and melted, led to both ends of the extrusion T-die, and heated and melted. The thermoplastic resin A is juxtaposed on both sides of the thermoplastic resin A and discharged so that the width of the portion of the thermoplastic resin A is larger than the width of the metal plate, and is extruded onto the metal plate. In the method for producing a resin-coated metal plate, the resin portion protruding from both ends of the metal plate is cut and removed after only the portion is formed into a resin-coated metal plate laminated and coated on the metal plate. A method for producing a resin-coated metal sheet, wherein the thermoplastic resin A is discharged so as to cover the thermoplastic resin B and extruded onto a casting roll.   The method for producing a resin-coated metal sheet according to claim 6, wherein a thermoplastic resin having a viscosity at the time of heating and melting higher than that of the thermoplastic resin A is used as the thermoplastic resin B.   When the thermoplastic resin A and the thermoplastic resin B are ejected from the extrusion T-die, the thermoplastic resin B that coexists on both sides of the thermoplastic resin A is used as the thermoplastic resin. The method for producing a resin-coated metal plate according to claim 6 or 7, wherein only the portion inevitably thicker than the thickness of A is extruded onto the metal plate.   The method for producing a resin-coated metal sheet according to any one of claims 6 to 8, wherein a colored thermoplastic resin is used as the thermoplastic resin B.   An extruder (A1) for heating and melting the thermoplastic resin A for the purpose of forming an unstretched film, and an extruder (B1) for heating and melting another thermoplastic resin B other than the thermoplastic resin A A molten resin supply pipe (A2) connected to the extruder (A1), a molten resin supply pipe (B2) connected to the extruder (B1), and the molten resin supply pipe A feed block comprising two holes B3a and B3b formed on both sides of the lower portion of the pipe (A2) and connected to the molten resin supply pipe (B2), and a manifold and the manifold In an apparatus for producing an unstretched film having a die lip connected to each other and a T-die connected to the feed block, the cross-sectional shape of the holes B3a and B3b is such that the major axis is the flow direction of the molten resin. The short axis in the parallel direction Characterized in that an elliptical shape is the flow direction perpendicular to the direction of the fusion resin, apparatus for producing a resin-coated metal sheet.

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