JP3392760B2 - Manufacturing method of chemical resistant sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to lining materials such as reaction towers, reaction tanks, storage tanks, transportation and storage tanks, liquid containers, containers for chemicals and electronic parts, and vehicles, ships. The present invention relates to a method for producing a chemical resistant sheet having weather resistance, heat resistance and the like suitable as an interior material for aircraft, public facilities, houses and the like.

[0002]

2. Description of the Related Art Fluorine-based resins are excellent in chemical resistance, heat resistance, non-adhesiveness, electrical characteristics, etc., and are therefore used in various industries such as chemicals, petroleum, paints, inks, industrial chemicals, pharmaceuticals and semiconductors. Widely used in the field. However, polytetrafluoroethylene resin (hereinafter abbreviated as PTFE), which is a typical fluorine-based resin, has poor surface activity, cannot be bonded by ordinary means, and does not melt and fluidize. When used for the interior of tanks, etc., in the past, so-called loose lining method of simply interposing the sheet between the vessel wall and the contents, or the surface on the adhesive side of the sheet was activated by mechanical or chemical treatment. Although the method of lining it through an adhesive after applying it was adopted, the former method has large application restrictions, and the latter method also has insufficient adhesive strength and the fragility of the sheet itself. There was a problem in use and processing due to.

Therefore, the present applicant has previously developed a laminated chemical resistant sheet using PTFE, and the chemical resistant sheet is continuously lengthened by thermocompression bonding between pairs of heat rolls. Has been established (Japanese Patent Publication No. 8-18410). As shown in FIG. 5, this chemical resistant sheet has a thermoplastic (melt flowable) fluororesin film interposed between a sheet base material made of PTFE and a glass cloth, which is thermocompression bonded to form an integrated laminate. With the glass cloth side as the adhesive surface, it can be adhered with high strength to the wall surfaces of various materials with ordinary adhesives, and the laminated structure with the glass cloth makes the sheet itself tough. Due to its advantages, it is already used in a wide range of industrial fields. In particular, the long product produced by the above manufacturing method,
Since it can be cut to an appropriate length according to the size of the part to be lined and the like, it can be economical because there is no waste of a large amount of unused short material due to excess parts.

[0004]

However, the chemical-resistant sheet obtained as a long product by the above-mentioned continuous production method is often wrinkled as a whole or partially wrinkled. Therefore, there is a problem to prevent the deterioration of quality due to these, and there is still room for improvement in the smoothness of the surface of the sheet base material side.

In view of the above circumstances, the inventors of the present invention have taken the PT
A similar chemical resistance sheet in which the FE sheet base material and the glass cloth are integrally laminated via the melt flowable fluororesin film, and a high quality product free from waviness and wrinkles is stably obtained by a continuous method. In order to investigate the means,
First, a detailed study was made on the factors that cause waviness and wrinkles in the sheet in the conventional continuous manufacturing method. As a result, in the process of finally winding up the laminated sheet integrated by thermocompression bonding between the pair of heat rolls, the laminated sheet heated to a high temperature by thermocompression is gradually cooled by natural cooling. However, since this cooling proceeds faster toward both sides than in the central portion in the sheet width direction, it has been found that the difference in shrinkage degree due to the temperature gradient in the sheet width direction causes waviness and wrinkles in the sheet.

[0006]

Then, as a result of further intensive studies based on the above findings, in order to prevent the corrugation and wrinkles of the above-mentioned sheet, a laminated sheet during or immediately after thermocompression bonding is used as a sheet substrate. It is very effective to positively and uniformly cool the entire sheet width direction from the material side, and it is preferable to use a low temperature roll as this cooling means. The inventors have found that the surface smoothness can also be improved and have completed the present invention.

That is, the method for producing a chemical resistant sheet according to the first aspect of the present invention includes a sheet base material 1 made of a PTFE (polytetrafluoroethylene) resin, as shown by the reference numerals in the drawings. A film 2 made of a fluorine-based resin having a melt fluidity and a glass cloth 3 are continuously fed out from each of the winding rolls R1 to R3 and stacked so that the film 3 is sandwiched between them. High temperature roll H whose roll surface temperature is higher than the melting point of the fluororesin of the film 3 while continuously running
1 and the low-temperature rolls C1 and C2 constituting the nip portions 4a and 4b with respect to the high-temperature roll H1 having a roll surface temperature lower than the same melting point, and thermocompression-bonded to the sheet substrate 1 A laminated sheet 11 in which the glass cloth 2 and the glass cloth 2 are integrated via the molten resin layer 30 of the film 3
It is characterized by

According to the above construction, the continuously running laminated sheet 10 includes the high temperature roll H1 and the low temperature rolls C1, C.
When passing through the nip portions 4a and 4b with the high temperature roll H
The fluororesin of the film 3 is melted and fluidized by the heat from 1, and the fluororesin of the film 3 is also adhered to the sheet base material 1 made of PTFE having a good affinity because it is also a fluororesin, and also enters between the fibers of the glass cloth 2, The sheet base material 1 and the glass cloth 2 are firmly integrated through the resin layer 30 of the film 3 to form the laminated sheet 11. Then, the laminated sheet 11 (superposed sheet 10) has the nip portion 4a,
In 4b, heat is uniformly and rapidly absorbed in the sheet width direction by heat absorption from one surface side by the low temperature rolls C1 and C2, so that the sheet base material 1 side does not reach an overheated state, whereby the sheet base material 1 The surface of the sheet is prevented from becoming rough, and a uniform shrinkage occurs in the sheet width direction due to this cooling. However, at a stage away from the nip portion 4b, the temperature is already lowered and the shrinkage is almost lost.

In the manufacturing method according to the first aspect,
According to the second aspect of the invention, if the laminated sheet 11 is passed between the high temperature roll H1 and the low temperature rolls C1 and C2 with the surface of the glass cloth 2 side contacting the high temperature roll H1, the sheet is formed. The surface of the base material 1 side is a low temperature roll C
Since it comes into contact with 1 and C2, the surface roughness of the outer sheet base material 1 is more reliably prevented.

In the method of manufacturing a chemical resistant sheet according to the third aspect of the present invention, a sheet base material 1 made of PTFE, a film 3 made of a fluororesin having melt fluidity, and a glass cloth 2 are provided. The film 3 is continuously fed out from the winding rolls R1 to R3 so that the film 3 is sandwiched in the middle, and while the laminated sheet 10 is continuously run, the roll surface temperature is higher than the melting point of the fluororesin of the film 3. Immediately after this thermocompression bonding, at least the surface of the sheet base material 1 side is brought into contact with the peripheral surfaces of the low-temperature rolls C2 and C5 whose roll surface temperature is lower than the same melting point while passing through a pair of high-temperature rollers H2 and H3. By letting
The laminated sheet 11 is characterized in that the sheet base material 1 and the glass cloth 2 are integrated with each other through the molten resin layer 30 of the film 3.

According to the third aspect of the present invention, the continuously running laminated sheet 10 is heated and pressure-bonded between the pair of high temperature rolls H2 and H3, so that the fluororesin of the film 3 is melted and fluidized, and Similar to the manufacturing method of claim 1, the sheet base material 1 and the glass cloth 2 are firmly integrated through the molten resin layer 30 of the film 3 to form a laminated sheet 11, which has a high temperature immediately after thermocompression bonding. Laminated sheet 11
At least the surface of the sheet base material 1 side is the low temperature roll C3.
By contacting C5, heat is uniformly and rapidly removed in the sheet width direction, so even if the sheet shrinks uniformly in the sheet width direction due to this cooling, it will already shrink because the temperature has already dropped. Moreover, the contact with the low temperature rolls C3 to C5 causes the surface roughness of the sheet base material 1 side to be repaired and smoothed.

In the above-mentioned manufacturing method of claims 1 to 3,
The roll surface of the high temperature rolls H1 to H3, as in the invention of claim 4, in order to surely exhibit the melting action of the fluororesin of the film 2 by the high temperature rolls H1 to H3 and the cooling action of the low temperature rolls C1 to C5. It is recommended that the temperature is set to 50 ° C. or more higher than the melting point of the fluororesin of the film 2 and the roll surface temperature of the low temperature rolls C1 to C5 is set to 50 ° C. or more lower than the melting point. Also,
In the manufacturing method according to any one of claims 1 to 4, from the viewpoint of the sheet characteristics as the chemical resistant sheet and the melting action and the cooling action, the thickness of the sheet base material 1 is 0.2 to, like the invention of claim 5. 5 mm, the thickness of the film 3 is 0.05 to 0.2
mm, and the thickness of the glass cloth 2 is preferably 0.2 to 2 mm.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A method for producing a chemical resistant sheet according to the present invention will be specifically described below with reference to the drawings. 1 to 5 show a configuration example of a continuous manufacturing apparatus to which the manufacturing method of the present invention is applied. In these figures, R1 is a winding roll of a sheet base material 1 made of PTFE, and R2 is a glass cloth 2
Winding roll, R3 is a winding roll of the film 3 made of a fluororesin having melt fluidity, H1 to H3 are high temperature rolls whose roll surface temperature is set higher than the melting point of the fluororesin of the film 3, C1 ~ C5 is a low-temperature roll which is not heated, 5A and 5B are front guide rolls forming a roll pair, 6
Is a rear guide roll, and 7 is a winding roll.

In the apparatus configuration of FIG. 1, one high temperature roll H
The two low temperature rolls C1 and C2 move forward and backward to form nip portions 4a and 4b, and the winding rolls R1 to R3.
The sheet base material 1, the glass cloth 2 and the film 3 which are respectively wound as a long product are continuously fed out in synchronism with each other, and the film 3 is passed between the front guide rolls 5A and 5B with the film 3 sandwiched in the middle. Then, the laminated sheet 10 is continuously run, and the surface on the glass cloth 2 side has a high temperature between the nip portions 4a and 4b at two positions before and after the high temperature roll H1 and the low temperature rolls C1 and C2 while continuously running the laminated sheet 10. The roll H1 is passed through in a state of being in contact with the peripheral surface of the roll H1 and thermocompression bonded thereto, and the laminated sheet 11 is continuously wound around the winding roll 7 via the rear guide roll 6.

In this manufacturing process, the continuously running laminated sheet 10 includes a high temperature roll H1 and two low temperature rolls C.
In the process of passing between C1 and C2, the fluororesin of the film 3 sandwiched in the middle is melted and fluidized by the heat from the high temperature roll H1 and is made of PTFE having a good affinity because it is also a fluororesin. While adhering to the sheet base material 1 and entering between the fibers of the glass cloth 2, as shown in FIG. 5, the sheet base material 1 and the glass cloth 2 are firmly bonded via the resin layer 30 of the intermediate film 3 melted and solidified. The laminated sheet 11 is integrated with the above.

In the front and rear nip portions 4a and 4b, however, the surface of the laminated sheet 11 (overlapping sheet 10) on the side of the sheet substrate 1 contacts the low temperature rolls C1 and C2, and the heat generated by the low temperature rolls C1 and C2 is applied. Since there is absorption, the sheet base material 1 side does not reach an overheated state, which prevents the surface roughness of the sheet base material 1. Further, especially in the rear nip portion 4b, the laminated sheet 11 contracts uniformly in the sheet width direction as it is cooled by the low temperature roll C2. Therefore, the occurrence of wrinkling and wrinkling due to the difference in expansion and contraction due to the temperature gradient in the sheet width direction during cooling is avoided. Therefore, the obtained laminated sheet 11, that is, the chemical resistant sheet, has extremely excellent flatness, and the surface on the sheet base material 1 side is smooth and exhibits high surface brightness.

In the above-mentioned manufacturing process, the thermocompression bonding section has two low temperature rolls C1 for one high temperature roll H1.
C2 is configured to form the nip portions 4a and 4b forward and backward, but a configuration in which one high temperature roll H1 and one low temperature roll form the nip portion, and one nip for each high temperature roll H1 It is also possible to adopt a configuration in which three or more low temperature rolls forming a part are arranged. However, in the former configuration in which one low-temperature roll is used, in order to surely melt the film 2 during thermocompression bonding, it is possible to avoid a situation where the film 2 does not melt during thermocompression bonding due to supercooling from the low-temperature roll side. Therefore, it is desirable to control the film 2 at the time of thermocompression bonding so as to surely reach the melting point or higher by means such as providing a heating mechanism also on the low temperature roll side. Further, in the latter case where the number of low-temperature rolls is three or more, since the nip portion is formed for one high-temperature roll 3, each low-temperature roll has a small diameter and a small heat radiation area. It is desirable to provide a positive cooling mechanism in order to suppress the temperature rise of each low-temperature roll due to heat transfer to below a certain temperature.

In the apparatus configuration shown in FIG. 2, two high temperature rolls H are used.
2, H3 form a roll pair, a low temperature roll C3 is independently arranged immediately after this roll pair, and the sheet base material 1 and the glass cloth which are continuously fed out in synchronization from the winding rolls R1 to R3. 2 and the film 3 are passed between the front guide rolls 5A and 5B in the same manner as described above to form a laminated sheet 10, which is passed between roll pairs of the high temperature rolls H2 and H3 and thermocompression bonded to form a laminated sheet 11. Immediately after the thermocompression bonding, the sheet base material 1 side of the laminated sheet 11 is brought into contact with the low temperature roll C3, and then the rear guide roll 6
After that, it is continuously wound around the winding roll 7.

In this manufacturing process, the continuously running superposed sheet 10 is heated and pressed between the pair of high temperature rolls H2 and H3, whereby the fluororesin of the film 3 is melted and fluidized, and the sheet base material 1 is used as described above. A laminated sheet 11 in which the glass cloth 2 and the glass cloth 2 are integrated via the film 3 (see FIG. 5).
However, when the surface of the laminated sheet 11 on the side of the sheet base material 1 which is at a high temperature immediately after the thermocompression bonding comes into contact with the low temperature roll C3, heat is uniformly and rapidly taken away in the sheet width direction to cool. To do. Therefore, with this cooling, uniform shrinkage occurs in the sheet direction, but since the temperature has already been lowered at a stage away from the low temperature roll C3 and the shrinkability has been lost, the temperature in the sheet width direction during cooling is reduced. The occurrence of waviness and wrinkles due to the gradient is avoided. In addition, even if the surface of the superposed sheet 10 is roughened on the side of the sheet base material 1 at the stage of passing between the pair of high temperature rolls H2 and H3, the surface of the PTFE in the high temperature state on the side of the sheet base material 1 is at a low temperature. By directly contacting the low-temperature smooth surface of the roll C3, its surface roughness is restored. Therefore, the obtained chemical resistant sheet is also excellent in flatness and also in surface smoothness on the side of the sheet substrate 1.

In the apparatus configuration shown in FIG. 2, the high temperature roll H
Although one low-temperature roll C3 is arranged immediately after the roll pair of H2 and H3, two low-temperature rolls C forming a roll pair immediately after the high-temperature rolls H2 and H3 as in the apparatus configuration shown in FIG.
If C3 and C4 are arranged and the laminated sheet 11 immediately after thermocompression bonding is set to pass through this roll pair, the flatness and surface smoothness of the sheet can be further improved by the improvement of cooling efficiency and the pinching effect. . Further, as in the apparatus configuration shown in FIG. 4, one of the high temperature rolls H2 and H3 is connected to the low temperature roll C.
5 is arranged so as to form a nip portion, and the high temperature roll H
The laminated sheet 11 passing between the pair of H2 and H3 is set so as to pass through the pair of the high temperature roll H2 and the low temperature roll C5 so that the surface of the sheet base material 1 side is in contact with the low temperature roll C5. Is also possible.

The roll surface temperature of the high temperature rolls H1 to H3 is set higher than the melting point of the fluororesin of the film 3 as described above, but in order to surely melt and fluidize the fluororesin, It is preferable to set the temperature 50 ° C. or more higher than the melting point. Further, as described above, the low-temperature rolls C1 to C5 have a temperature rise due to heat transfer during continuous operation even if non-heated rolls are used. 5 than the melting point of fluorine resin
It is preferable to set the temperature to be 0 ° C. or higher. In particular, as in the low temperature rolls C1 and C2 of FIG. 1 and the low temperature roll C5 of FIG. 4, the high temperature rolls H1 and H2 that form a nip portion to increase the heat transfer amount, the roll surface temperature is set low as described above. In the above, it is desirable to increase the roll diameter to improve the heat dissipation and to promote the exhaust heat due to the heat conduction from the bearing portion. If necessary, an appropriate cooling mechanism is provided to actively exhaust heat. Good.

The fluorine resin having melt fluidity used for the film 3 is not particularly limited, but is, for example, CF.
Copolymer of ₂ = CF ₂ and CF ₂ = CF-CF ₃ (commercially available product, Teflon FE, trade name of EI DuPont)
P), a copolymer of CF ₂ = CF ₂ and CF ₂ = CF-ORf (Rf is a perfluoroalkyl group: Teflon PF
A), a copolymer of CH ₂ = CH ₂ and CF ₂ = CF ₂ (same Teflon ETFE, trade name Tefzel of Du Pont-Mitsui Fluorochemicals Co., Ltd.), a polymer of CH ₂ = CF ₂ (polyvinylidene fluoride resin: same Teflon PVDF, Pennwa
The product name of Kainer Co., Ltd.), CH ₂ = CH ₂ and CF ₂ =
CClF copolymer (Teflon ECTFE), CHF
= CH ₂ polymer (same Teflon PVF) and the like,
Among these, CF ₂ = CF ₂ and CF ₂ = CF-C
F ₃ copolymer (Teflon FEP), and CF ₂ =
CF ₂ and CF ₂ = a copolymer of CF-ORf (Teflon P
FA) is preferred.

Here, the thickness of the PTFE sheet base material 1 is in the range of 0.2 to 5 mm, and the thickness of the film 2 made of a fluororesin having melt fluidity is in the range of 0.05 to 0.2 mm. Further, the thickness of the glass cloth 3 is preferably in the range of 0.2 to 2 mm.

That is, the thickness of the sheet base material 1 is 0.2 m.
If it is less than m, the characteristics of PTFE as a lining material cannot be sufficiently exhibited, and if it exceeds 5 mm, it becomes difficult to wind it into a roll as a sheet due to its large rigidity. It becomes difficult to apply the manufacturing method. If the thickness of the film 2 is less than 0.05 mm or the thickness of the glass cloth 3 exceeds 2 mm, the adhesive strength between the two becomes insufficient, and conversely the thickness of the film 2 is 0.2 mm. Or the thickness of the glass cloth 3 is less than 0.2 mm, the fluororesin of the film 3 melted at the time of thermocompression may penetrate to the surface of the glass cloth 3 to reduce the adhesiveness in the lining. Become. Then, the press nip pressure between the high temperature roll H1 and the low temperature rolls C1 and C2 in FIG.
The press nip pressure between the high temperature rolls H2 and H3 in No. 4 is preferably about 1 to 5 Kg / cm in order to moderately invade the melt-fluidized fluororesin into the glass cloth 3.

The laminated sheet 11 thus obtained, that is, the chemical resistant sheet, can be easily provided with an adhesive lining on the glass cloth 2 side by using a general adhesive agent to the wall surfaces of tower tanks and tanks. Along with the sheet base material 1
The surface of the side that can exhibit extremely high chemical resistance, heat resistance, non-adhesiveness, electrical characteristics, etc. of PTFE, and has excellent flatness without waviness or wrinkles on the sheet, and a good surface on the side of the sheet substrate 1 The sheet base material 1 and the glass cloth 2 have the smoothness and high quality, and the resin layer 30 of the film 3 is used.
Due to the strong bonding, there is no risk of peeling even under severe operating conditions. Also, since this chemical resistant sheet is obtained as a long product, it can be cut to an appropriate length according to the size of the site to be lined and used. It does not generate a large amount of unused short material due to the surplus portion unlike the elastic sheet, and is very economical with little waste.

[0026]

EXAMPLE 1 In the apparatus configuration of FIG. 1, a high-temperature roll H1 having a diameter of 250 mm whose surface is made of hard chrome plating, and an unheated low-temperature roll C1 having a diameter of 220 mm having a surface of hard chrome plating. Both low temperature rolls C using C2
The distance between the axes of 1 and C2 is 380 mm, and the nip portions 4a and 4b are
The press nip pressure of 2.5 kg / cm is set, the roll surface temperature of the high temperature roll H1 during continuous operation is controlled to 380 ° C., and the roll surface temperature of both low temperature rolls C1 and C2 is controlled to 180 to 200 ° C., respectively. While, thickness 2
sheet base material 1 made of PTFE having a thickness of 0.6 mm and a thickness of 0.65
mm glass cloth 2 and a film 3 made of Teflon PFA having a thickness of 0.125 mm are continuously fed out from winding rolls R1 to R3 having the same width, respectively, and are superposed through front guide rolls 5A and 5B. , This is 200
A long chemical resistant sheet was continuously manufactured by hot pressing through both nip portions 4a and 4b while continuously feeding at a rate of mm / min. This chemical-resistant sheet had no corrugation or wrinkle, was extremely flat, and had a smooth surface on the side of the sheet substrate 1 and high surface brightness.

Example 2 In the apparatus configuration of FIG. 2, high-temperature rolls H2 and H3 having a diameter of 250 mm, the roll surface of which is made of hard chrome plating,
220mm in diameter with roll surface made of hard chrome plating
Both non-heated low temperature roll C3 and high temperature roll H
The distance between the nip portion of H2 and H3 and the contact center position of the low temperature roll C3 is set to 380 mm, the press nip pressure of both high temperature rolls H2 and H3 is set to 2.5 Kg / cm, and high temperature rolls H2 and H3 during continuous operation are set. While controlling the roll surface temperature of 380 ° C., a sheet base material 1 made of PTFE having a thickness of 3 mm and a glass cloth 2 having a thickness of 0.65 mm
And a film 3 made of Teflon PFA having a thickness of 0.125 mm are continuously fed out from winding rolls R1 to R3 having the same width, respectively, and superposed through the front guide rolls 5A and 5B, and 190 mm / While continuously feeding in minutes, hot pressing was performed through a pair of both high temperature rolls H2 and H3, and then the surface of the sheet base material 1 side was brought into contact with the low temperature roll C3 to continuously produce a long chemical resistant sheet. . The roll surface temperature of the low temperature roll C3 during continuous operation is 1
It was maintained at 80 to 200 ° C. The obtained chemical resistant sheet had no corrugation or wrinkle and was extremely excellent in flatness, and the surface on the sheet substrate 1 side was smooth and had high surface brightness.

[0028]

According to the first aspect of the present invention, the chemical resistance of the film having the sheet base material made of PTFE and the glass cloth sandwiched therebetween is integrally laminated via the fluororesin layer having melt flowability. In producing a sheet by a continuous method, a laminated sheet of each material is formed between a high-temperature roll whose roll surface temperature is higher than the melting point of the fluororesin of the film and a low-temperature roll whose roll surface temperature is lower than the same melting point. Since it is thermocompression bonded through the nip portion, it is possible to obtain a very high quality chemical resistant sheet as a long product that has excellent flatness without waviness and wrinkles and good surface smoothness on the sheet base material side. it can.

According to the second aspect of the present invention, in the above manufacturing method, the laminated sheet is passed with the surface of the glass cloth side in contact with the high-temperature roll, so that the surface roughness of the sheet base material side is reliably prevented. Then, there is an advantage that a chemical resistant sheet having more excellent surface smoothness can be provided.

According to the third aspect of the present invention, when the same chemical resistant sheet as in the first aspect is manufactured by the continuous method, the laminated sheet of each material has a roll surface temperature of the melting point of the fluororesin of the film. While performing thermocompression bonding through a pair of higher-temperature rolls higher than this, immediately after this thermocompression bonding, at least the surface of the sheet base material side is brought into contact with the peripheral surface of the unheated low-temperature roll, so waviness and wrinkles may occur. It is possible to obtain a very high-quality chemical-resistant sheet as a long product, which is extremely excellent in flatness and also has good surface smoothness on the sheet base material side.

According to the invention of claim 4, in each of the above manufacturing methods, the roll surface of the high temperature roll and the low temperature roll is set to a specific temperature difference with respect to the melting point of the fluororesin of the film, There is an advantage that a chemical resistant sheet excellent in flatness and surface smoothness on the sheet base material side can be more reliably manufactured by a continuous method.

According to the invention of claim 5, in each of the above-mentioned manufacturing methods, since the thickness of the sheet base material, the glass cloth and the film is within a specific range, the reliability of the manufacturing of the chemical resistant sheet by the continuous method is ensured. And the properties suitable as a chemical resistant sheet can be imparted.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a first configuration example of a continuous manufacturing apparatus to which a method for manufacturing a chemical resistant sheet according to the present invention is applied.

FIG. 2 is a schematic side view showing a second configuration example of the continuous manufacturing apparatus.

FIG. 3 is a schematic side view showing a third configuration example of the continuous manufacturing apparatus.

FIG. 4 is a schematic side view showing a fourth configuration example of the continuous manufacturing apparatus.

FIG. 5 is a sectional view of the same chemical resistant sheet.

[Explanation of symbols]

1 sheet base material 2 glass cloth 3 film 4a, 4b Nip part 5A, 5B guide roll 6 guide rolls 7 winding roll 10 stacked sheets 11 laminated sheets H1-H3 high temperature roll C1-C5 low temperature roll R1 to R3 winding roll

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-8-99389 (JP, A) JP-A-48-73564 (JP, A) JP-A-8-70170 (JP, A) JP-A-9- 19964 (JP, A) JP 54-148884 (JP, A) JP 57-126619 (JP, A) JP8-18410 (JP, B2) JP49-16549 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B32B 1/00-35/00 B29C 63/00-63/48

Claims (5)

(57) [Claims] 1. A sheet base material made of polytetrafluoroethylene resin, a film made of a fluororesin having a melt fluidity, and a glass cloth are continuously fed out from respective winding rolls to form an intermediate film. , So that the roll surface temperature is higher than the melting point of the fluororesin of the film, and the roll surface temperature is lower than the melting point of the high temperature roll. By passing it between the low temperature rolls that make up the nip part and thermocompression bonding,
A method for producing a chemical resistant sheet, characterized in that a laminated sheet in which the sheet base material and the glass cloth are integrated via a molten resin layer of the film is formed. 2. The method for producing a chemical resistant sheet according to claim 1, wherein the laminated sheet is passed between the high temperature roll and the low temperature roll with the surface of the glass cloth side being in contact with the high temperature roll. 3. A sheet base material made of polytetrafluoroethylene resin, a film made of a fluororesin having a melt fluidity, and a glass cloth are continuously fed out from respective winding rolls to form an intermediate film. While being continuously run, the roll surface temperature is passed through a pair of high-temperature rolls having a temperature higher than the melting point of the fluororesin of the film to perform thermocompression bonding, and immediately after this thermocompression bonding. A laminated sheet in which the sheet base material and the glass cloth are integrated via the molten resin layer of the film by bringing at least the surface of the sheet base material side into contact with the peripheral surface of a low temperature roll having a roll surface temperature lower than the same melting point. A method for producing a chemical resistant sheet, comprising: 4. The roll surface temperature of the high temperature roll is set to be 50 ° C. or more higher than the melting point of the fluororesin of the film, and the roll surface temperature of the low temperature roll is set to be 50 ° C. or more lower than the melting point. 4. The method for producing a chemical resistant sheet according to any one of 3 to 3. 5. The sheet base material having a thickness of 0.2 to 5 mm, the film having a thickness of 0.05 to 0.2 mm, and the glass cloth having a thickness of 0.2 to 2 mm. A method for producing the described chemical resistant sheet.