JP2014208929A - Method of manufacturing anticorrosive tape and apparatus for manufacturing anticorrosive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing an anticorrosive tape that can easily manufacture a corrosive tape in which a corrosive compound hard to excessively soften during heating is supported to a fiber sheet.SOLUTION: A method of manufacturing an anticorrosive tape comprises a step of impregnating. The step comprises positioning a fiber sheet in a transferring passage, passing the fiber sheet, on both surface of which an anticorrosive compound is attached, between a pair of rolls rotatably positioned around a rotating axis, and impregnating the anticorrosive compound in the fiber sheet with the roll by passing, between the rolls, the fiber sheet attached with the anticorrosive compound such that the sum thickness of the anticorrosive compound and the fiber sheet is thicker than a gap between the rolls. The step of impregnating further comprises rotating the roll such that the moving direction of the outer circumference surface on the fiber sheet side is the same as the transferring direction of the fiber sheet, and rotating the roll such that the moving speed of the outer circumference surface is exceed to the transferring speed of the fiber sheet.

Description

  The present invention relates to an anticorrosion tape manufacturing method and an anticorrosion tape manufacturing apparatus.

  Conventionally, in various plants, etc., it is used outdoors such as pipes for structural materials, gas and water, electric pipes for laying electric wires, etc., pipes used for conveying raw materials and semi-finished products, and various storage tanks. In order to prevent corrosion of a metal member to be formed, the metal member is covered with an anticorrosion tape to form an anticorrosion structure (see Patent Document 1 below).

  As this anticorrosion tape, what carried the anticorrosive compound which contains an oil component and an inorganic filler as a main component on the base material sheet is known widely, for example, as indicated in the following patent documents 2, It is widely known that a polyester fiber sheet is used as a base sheet, and the base sheet is supported with an anticorrosive compound in which petrolatum is adopted as the oil.

When producing an anticorrosion tape using this type of petrolatum-based anticorrosion compound, conventionally, a long belt-like fiber sheet is prepared as a base sheet, and the fiber sheet is continuously oriented in the longitudinal direction. An impregnation step of impregnating the fiber sheet with the anticorrosive compound while being transferred to the fiber sheet is carried out.
Specifically, the impregnation step is a method in which the anticorrosive compound is dispersed in an organic solvent or heated and melted to make the anticorrosive compound a low-viscosity liquid, and the fiber sheet is immersed in the liquid. It has been implemented in the past.

JP-A-10-44320 JP-A-7-97769

Of the above-described anticorrosion tape manufacturing methods, it is not preferable to use a large amount of an organic solvent in the impregnation step in view of the working environment.
On the other hand, if the anticorrosive tape is a liquid that has a low viscosity when heated to an anticorrosive compound, the anticorrosive compound can be dropped from the anticorrosive tape when used outdoors in the summer, etc. May cause component separation.

  Therefore, in consideration of the above situation, it is preferable that the anticorrosion tape has a base sheet carrying an anticorrosive compound that does not cause excessive softening within the temperature assumed as the use environment.

However, in order to obtain such an anticorrosion tape, a manufacturing method in which the anticorrosive compound is carried on the fiber sheet in a high viscosity state is adopted.
Accordingly, a long strip-shaped fiber sheet is transported in the longitudinal direction and a point for impregnating the anticorrosive compound is provided in the fiber sheet transfer path, and the anticorrosive compound is continuously impregnated from one end side to the other end side of the fiber sheet. In order to produce an anticorrosion tape efficiently, there is a risk that impregnation of the anticorrosive compound into the fiber sheet will be insufficient unless the transfer speed of the fiber sheet is reduced.
On the other hand, in order to quickly impregnate the fiber sheet with the anti-corrosive compound, it may be possible to apply a high pressure toward the fiber sheet to the anti-corrosion compound, but in that case, there is a possibility of generating a strong tension on the fiber sheet. There is a risk of causing problems such as necking and fracture.
For these reasons, it has conventionally been difficult to easily produce an anticorrosion tape in which an anticorrosive compound that is unlikely to be in a low-viscosity state upon heating is carried on a fiber sheet.
Accordingly, the present invention has an object to solve such a problem, and the production of an anticorrosive tape capable of easily producing an anticorrosive tape having a fiber sheet carrying an anticorrosive compound that is hardly excessively softened during heating. It is an object to provide a method and an anticorrosion tape manufacturing apparatus.

  The present inventor pays attention to the step of impregnating the fiber sheet with the anticorrosive compound, and by impregnating the fiber sheet with the anticorrosive compound by a predetermined method, the fiber sheet can be satisfactorily impregnated even in a high viscosity anticorrosive compound. The present invention has been found and completed.

  That is, in order to solve the above-mentioned problem, the present invention implements an impregnation step of impregnating the fiber sheet with the anticorrosive compound while continuously transferring the belt-like fiber sheet in the longitudinal direction, and thereby forming a base comprising the fiber sheet. An anticorrosion tape manufacturing method for producing an anticorrosion tape in which the anticorrosion compound is carried on a material sheet, wherein the anticorrosion tape is produced by a path for transferring the fiber sheet and between a pair of rolls arranged to be rotatable around a rotation axis. The fiber sheet having the anticorrosive compound attached on both sides is passed between the rolls, and the anticorrosive compound and the fiber sheet are attached between the rolls so that the total thickness of the anticorrosive compound and the fiber sheet is larger than the gap between the rolls. An impregnation step of impregnating the fiber sheet with the anticorrosive compound with the roll is performed by passing the roll, In such a manner that the moving direction of the outer peripheral surface on the fiber sheet side is the same as the moving direction of the fiber sheet, and the moving speed of the outer peripheral surface exceeds the moving speed of the fiber sheet. An anticorrosion tape manufacturing method characterized by rotating a roll is provided.

The present invention also provides a transfer device for continuously transferring a belt-like fiber sheet in the longitudinal direction, and an impregnation step for impregnating the fiber sheet being transferred by the transfer device with an anticorrosive compound. An anticorrosion tape manufacturing apparatus comprising an impregnation part for producing an anticorrosion tape in which the anticorrosion compound is supported on a base sheet made of a sheet,
The impregnation part is arranged in a path for transferring the fiber sheet, and includes a pair of rolls arranged to be rotatable around a rotation axis,
A fiber sheet on which the anticorrosive compound is attached on both sides between the pair of rolls and the anticorrosive compound is attached so that the total thickness of the anticorrosive compound and the fiber sheet is larger than the gap between the rolls. The fiber sheet is impregnated with the anticorrosive compound by passing the sheet between the rolls, and in the impregnation process, the movement direction of the outer peripheral surface of the roll on the fiber sheet side is the position of the fiber sheet. The anticorrosion characterized in that the roll is rotated so as to be in the same direction as the transfer direction, and the roll is rotated so that the moving speed of the outer peripheral surface exceeds the transfer speed of the fiber sheet. A tape manufacturing apparatus is provided.

According to the present invention, the fiber sheet passes between a pair of rolls that can be rotated around a rotation axis arranged in a path for continuously transferring the belt-like fiber sheet in the longitudinal direction, and between the rolls. The fiber sheet having the anticorrosive compound attached to both sides so as to be thicker than the gap passes between the rolls.
That is, the anticorrosive compound adhered to the fiber sheet at this time is subjected to pressure from the roll toward the inside of the fiber sheet as the fiber sheet moves toward the location where the rolls are closest to each other. Become.
In the present invention, the fiber sheet can be satisfactorily impregnated even with an anticorrosive compound having a high viscosity by this pressure.

However, if the fiber sheet to which the anticorrosive compound is adhered is simply passed between the rolls, the resistance applied to the fiber sheet when passing between the rolls becomes too high when the viscosity of the anticorrosive compound is high, and the fiber sheet after passing through the roll. May cause strong tension.
Therefore, a method in which a fiber sheet to which a high-corrosion anticorrosive compound is attached is simply passed between rolls may cause a large tension to be applied to the fiber sheet due to resistance when passing between rolls.
When a large tension is applied to the fiber sheet, the width of the fiber sheet that is passed between the rolls and impregnated with the anticorrosive compound is greatly shrunk compared to the width of the fiber sheet before passing through the roll (so-called “necking”). Or in extreme cases, the fiber sheet may be cut.
The roll in the present invention is rotated so that the movement direction of the outer peripheral surface on the fiber sheet side is the same direction as the transfer direction of the fiber sheet, and the moving speed of the outer peripheral surface exceeds the transfer speed of the fiber sheet. It is rotated to become.
Therefore, according to this invention, the resistance force added to a fiber sheet when passing between rolls can be reduced, and necking and cutting | disconnection of a fiber sheet can be prevented.

  That is, according to the present invention, a method and an apparatus for producing an anticorrosion tape suitable for supporting an anticorrosive compound on a fiber sheet in a high viscosity state are provided, and the anticorrosion that is not excessively softened during heating. Even an anticorrosion tape having a compound supported on a base sheet can be easily produced.

The schematic block diagram which shows the principal part of the manufacturing equipment for manufacturing an anticorrosion tape. The schematic block diagram which shows the principal part of the other manufacturing equipment for manufacturing an anticorrosion tape.

The preferred embodiments of the present invention will be described below.
First, an example of the anticorrosion tape produced with the manufacturing method of this invention is demonstrated.
The anticorrosion tape in this embodiment is formed by supporting an anticorrosive compound containing an inorganic filler and an oil component as main components on a base sheet made of a fiber sheet.

The anticorrosive compound in the present embodiment contains an oil and an inorganic filler, and the liquid is liquid oil (hereinafter also referred to as “oil”) that is liquid at room temperature and normal pressure (eg, 20 ° C., 1 atm) as the oil. It contains solid oil (hereinafter also referred to as “wax”) that is solid at normal temperature and pressure.
In the present specification, the term “solid” does not mean only a solid in a strict sense that does not cause a deformation by a normal external force, but a natural material that does not cause a deformation by an external force. It is used to include a state called “semi-solid” that does not cause flow.

The anticorrosion compound in the present embodiment does not cause problems such as component dripping even when the anticorrosion tape is exposed to direct sunlight in summer or wrapped around a pipe through which a high-temperature fluid is distributed. In order to make the effect of the present invention more remarkable, it is preferable that the wax does not generate a natural flow even in a temperature range equal to or higher than a temperature at which the wax is in a molten state.
However, when the anticorrosive compound has an excessively high viscosity, it may be difficult to impregnate the fiber sheet.
In addition, the anticorrosive compound of the present embodiment is such that the anticorrosive tape can be excellent in followability to the shape of the metal member to be protected, and the surface can be easily smoothed using a fingertip or a spatula. It is preferable that the consistency at normal temperature (for example, 20 ° C.) is 150 (1/10 mm) or more.
In particular, assuming a case where an anticorrosion tape is used for construction in winter, the anticorrosion compound of this embodiment preferably has a consistency of 50 (1/10 mm) or more at a low temperature (for example, 0 ° C.).
Further, the anticorrosive compound preferably has a consistency of 250 (1/10 mm) or less at a high temperature (for example, 50 ° C.) assumed in a normal use situation of the anticorrosion tape, and is 200 (1/10 mm) or less. It is more preferable.
Further, the anticorrosive compound is preferably such that the change in consistency is suppressed to some extent from low temperature to high temperature. The difference between the consistency value at 50 ° C. and the consistency value at 0 ° C. [Consistency (50 ° C. ) -Consistency (0 ° C.)] is preferably 100 (1/10 mm) or less.
In this embodiment, as will be described later, the base sheet is fed out with a constant tension, passed between the paired rolls, and the anticorrosive compound is imprinted on the base sheet with the roll to prevent necking. ing.
Therefore, it is preferable that the anticorrosive compound has a mayonnaise shape and a low viscosity in order to reduce the impregnation resistance.
Therefore, the anticorrosive compound of the present embodiment has a consistency of 200 (1/10 mm) or more and 300 (1/10 mm) or less by heating in consideration of the ease of impregnation of the base sheet with a roll. Those are preferred.

Examples of the wax include hydrocarbon wax, fatty acid amide wax, and fatty acid ester wax.
The hydrocarbon wax may be, for example, petroleum wax such as paraffin wax, microcristan wax, and petrolatum, or may be synthetic wax such as polyethylene wax, polypropylene wax, and Fischer-Tropsch wax.
As the fatty acid amide wax, for example, stearamide such as ethylene bis stearamide can be adopted.
Examples of the fatty acid ester wax include methyl esters such as coconut oil and beef tallow.
In addition to the above, the anticorrosive compound of this embodiment includes, as the wax, animal natural waxes such as beeswax, whale wax, shellac wax, plant natural waxes such as carnauba wax, wood wax, rice wax, candelilla wax, and montan. Mineral natural waxes such as wax and ozokerite can be contained.
The wax may be contained alone in the anticorrosion compound, or a plurality of waxes may be contained in the anticorrosion compound in combination.

The oil may be a naphthenic oil or a paraffinic oil.
As the paraffinic oil, for example, neutral oil or bright stock oil can be employed.
Further, hydrocarbon-based synthetic oils, ester-based synthetic oils, ether-based synthetic oils, silicone-based synthetic oils, fluorine-based synthetic oils and the like can be appropriately contained in the anticorrosive compound as the oil.
The oil may be contained alone in the anticorrosive compound, or a plurality of oils may be contained in the anticorrosive compound in combination.

Examples of the inorganic filler include powders made of calcium carbonate, aluminum hydroxide, magnesium hydroxide, talc, clay, zeolite, silica, mica, bentonite, and the like. In the anticorrosion compound, it may be contained, or a plurality of anticorrosion compounds may be combined and contained in the anticorrosion compound.
Bentonite powder is preferably used as the inorganic filler in terms of excellent effects of suppressing the fluidity of the anticorrosive compound in the temperature range where the wax is in a molten state, and a cation existing between montmorillonite crystal layers. It is particularly preferable to employ an organic bentonite powder obtained by ion exchange of quaternary ammonium ions.
Organonized bentonite powder is effective for exerting thixotropy against molten wax and oil, and is particularly effective for suppressing fluidity of the anticorrosive compound of this embodiment at high temperatures. is there.
That is, when the anticorrosive compound of this embodiment contains an organic bentonite powder, it maintains a gel state even in a temperature range where the wax is in a molten state, and when an external force is applied in the same temperature range. It is preferable to exhibit fluidity as a sol, and it is preferable to exhibit so-called thixotropy.

The anticorrosive compound of the present embodiment may contain a tackifier or the like so as to impart appropriate surface tackiness to the anticorrosive compound and to exhibit excellent adhesion to an object to be protected such as piping on the anticorrosive tape. .
Examples of the tackifier include hydrogenated terpene resin, terpene resin, hydrogenated rosin ester, natural rubber and synthetic rubber. Examples of the synthetic rubber include room temperature liquid polybutene and isobutylene which are low-isobutylene polymers. Room temperature solid polyisobutylene obtained by highly polymerizing.

  In addition to the above, the anticorrosive compound of the present embodiment includes a flame retardant, an antifungal agent, an antifungal agent, an antifungal agent, an antiaging agent, an antioxidant, a pigment, a leveling agent, etc., depending on the desired purpose. Yes.

The base material sheet impregnated and supported with the anticorrosion compound of the present embodiment can be a fiber sheet similar to that used as a base material sheet of a general anticorrosion tape.
As the fiber sheet, for example, a fiber sheet having a thickness of 0.4 mm or more and 3.0 mm or less and a basis weight of 60 g / m ² or more and 280 g / m ² or less can be adopted.

  More specifically, polyester resins such as polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate resin, and polylactic acid resin; polyamide resins such as aliphatic polyamide resin and aromatic polyamide resin; polyolefins such as polyethylene resin and polypropylene resin Resin: Nonwoven fabric and woven fabric sheet made of fibers made of engineering plastics such as polyimide resin, polyamideimide resin, polyethersulfone resin, polyetheretherketone resin, polyphenylene sulfide resin, polyketone resin It can illustrate as a preferable base material sheet of the anticorrosion tape of embodiment.

  The base sheet includes semi-synthetic fibers such as acetate fibers; regenerated fibers such as rayon; natural fibers such as cotton, hemp, wool, and silk; inorganic fibers such as carbon fibers, glass fibers, rock wool, and metal fibers. Nonwoven fabrics and woven fabrics made of can also be used.

  When a non-woven fabric is employed as the substrate sheet, any of the above-described fibers used alone or a mixture of a plurality of fibers may be used.

  In addition, when a woven fabric is used as the base sheet, one or more of the above fibers are arranged or twisted cords are plain woven, mat woven, twill woven, or satin woven Can be adopted.

Among such fiber sheets, the base sheet of the anticorrosion tape of the present embodiment is preferably a non-woven fabric made of polyester fibers excellent in performance for impregnating and carrying the anticorrosion compound.
As the polyester fiber non-woven fabric, those produced by various methods such as spun bond, chemical bond, needle punch, stitch bond and the like can be adopted, and among them, a non-woven fabric formed by stitch bonding is preferable.

The anticorrosion tape of this embodiment suppresses the separation of components such as oil separation and the removal of the anticorrosive compound itself from the base sheet even when the anticorrosive compound has low fluidity at high temperatures and is heated. Is done.
And as above-mentioned, fiber separation, such as a stitch bond nonwoven fabric, is employ | adopted as a base material sheet, and can isolate | separate further and the detachment | leave from the base material sheet of anticorrosion compound itself.
In addition, since the stitch bond nonwoven fabric has larger surface irregularities than felt or the like, when the stitch bond nonwoven fabric is employed as a base sheet of the anticorrosion tape, a part of the base sheet is applied to the surface of the anticorrosion tape. There is a risk of exposure.
On the other hand, the anticorrosion tape of the present embodiment is preferably formed so that the substrate sheet is not exposed on both the front and back surfaces of the anticorrosion tape in order to exhibit high anticorrosion performance.

About the manufacturing method of the anticorrosion tape in which it was suppressed that the base material sheet was exposed to the surface while using the said polyester fiber nonwoven fabric (henceforth a "polyester nonwoven fabric") formed by this stitch bond for a base material sheet. Explained.
In this embodiment, after producing a sheet body (hereinafter also referred to as “impregnated sheet”) obtained by impregnating a long belt-like base material sheet with an anticorrosive compound, the anticorrosion tape is prepared by slitting to an appropriate width.

FIG. 1 is a schematic configuration diagram showing a main part of the anticorrosion tape manufacturing apparatus of the present embodiment. The anticorrosion tape manufacturing apparatus of this embodiment is a manufacturing facility for manufacturing the anticorrosion tape of this embodiment. As also shown in the drawings, the production method uses a base sheet roll 1 in which a long strip-shaped polyester nonwoven fabric 10 is wound into a roll.
The manufacturing facility of the present embodiment includes a transfer device Z that transfers a belt-shaped polyester nonwoven fabric fed from the base sheet roll 1 in the longitudinal direction. In addition, the manufacturing equipment of the present embodiment performs the impregnation step of impregnating the polyester nonwoven fabric transferred by the transfer device Z with the anticorrosive compound, and the anticorrosion compound is formed by supporting the anticorrosive compound on a base sheet made of polyester nonwoven fabric. An impregnation part for producing a tape is provided. The impregnation part has a pair of rolls 20 as shown in the drawing on the transfer path of the polyester nonwoven fabric by the transfer device Z.

More specifically, in the production equipment for producing the anticorrosion tape of the present embodiment, the two rolls 20 that can rotate around the axis extend the rotation axis in a substantially horizontal direction, and the horizontal direction. It is arranged to make a pair.
The manufacturing equipment of this embodiment includes a pair of rolls 30 separately from the roll 20 below the roll 20, and the lower roll 30 is the same as the upper roll 20. It is provided in a state that it can rotate around the rotation axis, and is arranged directly under the upper roll 20 in a horizontal pair.
Hereinafter, the upper roll 20 is also referred to as an upper roll 20, and the lower roll 30 is also referred to as a lower roll 30.

And after the said transfer apparatus Z passes the said polyester nonwoven fabric through between the upper rolls 20 from the top to the bottom, it is made to pass further between the lower rolls 30 from the top to the bottom, and to manufacturing equipment. Is provided.
Moreover, in this embodiment, the winding machine Z1 for winding up the polyester nonwoven fabric after passing the said lower roll 30 as one of the apparatuses which comprise the said transfer apparatus Z is equipped with the anticorrosion tape manufacturing equipment. Yes.

The manufacturing facility of the present embodiment supplies the heated anticorrosive compound to one side of the polyester nonwoven fabric just before passing between the upper rolls 20 and the other side opposite to the one side. An anti-corrosion compound supply device 40 for supplying the anti-corrosion compound heated to one side and the other side of the polyester nonwoven fabric immediately before passing between the lower rolls 30 is further provided.
That is, the anticorrosion compound supply device 40 is provided to supply the anticorrosion compound A above the upper roll 20 and the lower roll 30.

The upper roll 20 in which two rolls are arranged in pairs is for forcibly impregnating the anticorrosive compound into the polyester nonwoven fabric by the roll when the polyester nonwoven fabric passes between them. .
On the other hand, the lower roll 30 is for further adding a corrosion-proof compound to the polyester nonwoven fabric internally impregnated with the anti-corrosion compound by the upper roll 20 and supporting a predetermined anti-corrosion compound on the anti-corrosion tape. .
That is, the manufacturing facility of the present embodiment is a method in which an impregnated sheet impregnated with and supported by an anticorrosive compound on a polyester nonwoven fabric is once produced by the upper roll 20 and then a larger amount than the impregnated sheet produced by the upper roll 20. An impregnated sheet impregnated and supported by the anticorrosive compound is formed by the lower roll 30.
In the following, the impregnated sheet between the upper roll 20 and the lower roll 30 is referred to as a “primary impregnated sheet”, and the impregnated sheet after passing through the lower roll 30 is referred to as a “secondary impregnated sheet”. May be called.

From the above, the upper roll 20 is stored in the middle of the polyester nonwoven fabric in the thickness direction when the polyester nonwoven fabric passes while retaining the corrosion preventing compound A supplied from the anticorrosive compound supply device 40 to some extent on the upper side. When the primary impregnated sheet is produced in order to ensure that the portion is impregnated with the anticorrosion compound A, a gap that is narrower than the natural thickness of the polyester nonwoven fabric is provided.
On the other hand, the lower roll 30 is configured to store the anticorrosive compound to some extent on the upper side in the same manner as the upper roll 20, and when producing the secondary impregnated sheet, the lower roll 30 is formed on the surface of the impregnated sheet. In order to prevent the polyester nonwoven fabric from being exposed, it is used with a gap wider than the thickness of the primary impregnated sheet.

  That is, the anticorrosion tape manufacturing facility of the present embodiment sequentially passes the polyester nonwoven fabric having the anticorrosive compound supplied from the anticorrosive compound supply device 40 on both sides between the upper roll 20 and the lower roll 30. In addition, the polyester non-woven fabric having the anti-corrosive compound attached to both surfaces so that the total thickness of the anti-corrosive compound and the polyester non-woven fabric is thicker than the gap between the upper roll 20 and the lower roll 30 is passed between the rolls to pass the polyester. The nonwoven fabric can be impregnated with an anticorrosive compound.

And when the said upper roll 20 produces the said impregnated sheet, both two rolls rotate, and the moving direction of the outer peripheral surface in the polyester nonwoven fabric side is the same direction as the transfer direction of the polyester nonwoven fabric 10. It is provided to be rotated.
Then, when the primary impregnated sheet is produced, the upper roll 20 is rotated so that the moving speed of the outer peripheral surface exceeds the transfer speed of the polyester nonwoven fabric 10.
If the distance between the upper rolls 20 is excessively narrow with respect to the natural thickness of the polyester nonwoven fabric, the resistance when the polyester nonwoven fabric passes increases even if the upper roll 20 is rotated at a high speed. There is a risk of causing necking.
From this, when the natural thickness of the polyester nonwoven fabric is t (mm), the interval between the upper rolls 20 is preferably 0.5 t (mm) or more and 0.9 t (mm) or less, and 0.6 t (mm). ) Or more and 0.8 t (mm) or less.
Similarly to the upper roll 20, the lower roll 30 also rotates the two rolls when the impregnated sheet is produced, and the movement direction of the outer peripheral surface on the polyester nonwoven fabric side is the polyester nonwoven fabric 10. It is provided to be rotated so as to be in the same direction as the transfer direction.
And when producing the secondary impregnated sheet, the said lower roll 30 is rotated so that the moving speed of the said outer peripheral surface may become equal to the transfer speed of the said polyester nonwoven fabric 10. As shown in FIG.

  In the manufacturing facility of the present embodiment, the anticorrosive compound supplied from the anticorrosive compound supply device 40 to above the upper roll 20 and the lower roll 30 is cooled on the surfaces of the upper roll 20 and the lower roll 30 and extremely. In order to prevent the viscosity from increasing, a heating device (not shown) is provided so that the surfaces of the upper roll 20 and the lower roll 30 can be controlled at a predetermined temperature.

In the present embodiment, when the upper roll 20 and the lower roll 30 are excessively small in diameter, the distance between rolls / rolls in the direction (horizontal direction) perpendicular to the transfer direction of the polyester nonwoven fabric 10 (D in FIG. 1). ) Greatly changes in the transfer direction of the polyester nonwoven fabric 10.
In other words, the distance between the rolls is abruptly shortened before the polyester nonwoven fabric passes through the portion where the gap between the rolls is the narrowest.
Thus, when the distance between rolls becomes short suddenly, the passage resistance at the time of a polyester nonwoven fabric passing between rolls will be changed a lot.
Further, if the upper roll 20 and the lower roll 30 are excessively small in diameter, the amount of the anticorrosive compound that can be stored on the upper side is limited to a small amount, and in some cases, the impregnation of the anticorrosive compound is interrupted. There is a risk of it.
Further, in the manufacturing facility of the present embodiment, when the upper roll 20 and the lower roll 30 are excessively thin in diameter, the rigidity is insufficient and the film is easily bent, and the thickness of both end portions is larger than the thickness of the central portion in the width direction. May form a thin impregnated sheet.
On the other hand, if the upper roll 20 and the lower roll 30 are excessively large in diameter, the facility becomes large.

Therefore, the upper roll 20 and the lower roll 30 preferably have a diameter of about 100 mm to 350 mm.
The material of the upper roll 20 and the lower roll 30 is not particularly limited. For example, a metal or ceramic one can be used.

Next, a method for producing an anticorrosion tape using such equipment will be described.
First, the upper roll 20 and the lower roll 30 are made to be in a state in which a gap between the paired rolls is opened larger than the thickness of the polyester nonwoven fabric 10.
In this state, the belt-shaped polyester nonwoven fabric 10 is fed out from the outside of the base sheet roll 1, passed between the upper rolls 20 and then passed between the lower rolls 30, and the tip portion of the polyester nonwoven fabric 10 is A paper passing process for attaching to the winder Z1 is performed.
After this paper passing process is completed, the upper roll 20 and the lower roll 30 are heated to a predetermined temperature, and then the gap between the upper roll 20 and the lower roll 30 is set to a predetermined interval to supply the anticorrosive compound. The anticorrosive compound A is supplied from above the apparatus 40 to the upper roll 20 and the lower roll 30, and the winder Z1 is operated to start the transfer of the polyester nonwoven fabric 10.
At this time, the movement direction of the outer circumferential surface of the upper roll 20 and the lower roll 30 is the same direction as the polyester nonwoven fabric 10 on the polyester nonwoven fabric side, and the movement speed of the outer circumferential surface is faster than the transfer speed of the polyester nonwoven fabric 10. The impregnation step of rotating the polyester nonwoven fabric 10 to impregnate the anticorrosive compound is performed.

In the impregnation step, the upper roll 20 is preferably rotated so that the outer peripheral surface moves at a speed 1.5 to 2.0 times the transfer speed of the polyester nonwoven fabric 10.
In addition, the lower roll 30 is preferably rotated so that the outer peripheral surface moves at substantially the same speed as the transfer speed of the polyester nonwoven fabric 10.

In the present embodiment, the upper roll 20 and the lower roll 30 move their outer peripheral surfaces in the same direction as the transfer direction of the polyester nonwoven fabric 10 and rotate at a faster peripheral speed than the polyester nonwoven fabric 10. Therefore, the passage resistance of the polyester nonwoven fabric 10 when passing through the upper roll 20 and the lower roll 30 can be sufficiently reduced, and the occurrence of problems such as necking in the polyester nonwoven fabric 10 is suppressed. be able to.
Therefore, in this embodiment, for example, even when the polyester nonwoven fabric 10 is impregnated with a high-viscosity anticorrosive compound, it is possible to suppress problems such as necking in the polyester nonwoven fabric 10.

In addition, after letting the said lower roll 30 pass, it is preferable to cool enough and to wind up with the said winder Z1.
Further, the slitting step of slitting the impregnated sheet 10 ′ to a predetermined width to produce an anticorrosion tape may be performed by providing a slit blade immediately before the winder, or the impregnated sheet 10 ′ You may make it implement when rewinding impregnated sheet | seat 10 'which wound up the full length once in roll shape with the winder.

The anticorrosion tape thus obtained can be used for various purposes in addition to being used for the purpose of protecting the pipe material against rust by winding it around a pipe material such as metal pipe.
The anticorrosion tape of the present embodiment can be easily produced without reducing the viscosity with an organic solvent even when an anticorrosive compound that does not show a significant decrease in viscosity even at high temperatures is adopted as its constituent material.
Moreover, the anticorrosion tape of the present embodiment can suppress the separation of the anticorrosive compound during use and the desorption of the anticorrosive compound from the fiber sheet, and can exhibit an excellent anticorrosive effect.

  In this embodiment, it is easy to store the anticorrosive compound on the roll, and the gap between the rolls from the top to the bottom in that the anticorrosive compound to be impregnated into the fiber sheet can be more reliably prevented from being interrupted. Although the method of allowing the fiber sheet to pass through is illustrated as a preferred embodiment of the anticorrosion tape manufacturing method, in the impregnation step of impregnating the fiber sheet with the anticorrosive compound, the direction in which the fiber sheet passes between the rolls is directed from top to bottom. It is not limited to the direction.

  Further, in the present embodiment, a pair of rolls provided with a gap shorter than the natural thickness of the fiber sheet, and the roll, in that the fiber sheet can be more reliably prevented from being exposed to the surface of the anticorrosion tape. Is described as a preferred embodiment of the impregnation step, for example, using only one pair of rolls. The roll is provided with a gap shorter than the natural thickness of the fiber sheet and the first impregnation step is performed, and then the gap between the rolls is reset so as to be wider than the natural thickness of the fiber sheet. In the effect of preventing the fiber sheet from being exposed to the surface of the anticorrosion tape even if the second impregnation step is performed on the impregnated sheet obtained in one impregnation step, the method exemplified in this embodiment Flip it.

In addition, if necessary, the surface of the fiber sheet may be prevented from being exposed by performing the impregnation step only once using a pair of rolls set so that the gap is wider than the natural thickness of the fiber sheet. Good.
Although FIG. 2 shows an apparatus in which a pair of rolls 50 is added to the apparatus of FIG. 1, as shown in FIG. 2, the impregnation step may be performed using three or more pairs of rolls.
That is, the anticorrosion sheet manufacturing method of the present invention is not limited to the above-described examples.

Hereinafter, the method for producing an anticorrosion tape according to the present invention will be described more specifically with reference to examples, but the present invention is not limited to the following examples.
(Examination 1: Examination of roll rotation speed, production examples 1 to 4)
(Production example 1)
A long strip-shaped base sheet (polyester nonwoven fabric (spunlace / spunbond nonwoven fabric) having a thickness of 0.70 mm, a basis weight of 85 g / m ² and a width of 650 mm, as shown in FIG. An anti-corrosion compound heated to 80 ° C. was stored on the roll and the roll was placed on the roll, and the base sheet was impregnated with the anti-corrosion compound to produce an impregnated sheet.
The upper roll and the lower roll were all 150 mm in diameter.
The anticorrosion compound used had a consistency at 230C of 230 (1/10 mm).
In this production example, the base sheet was impregnated with the anticorrosive compound while passing between the rolls so that the transfer speed was 2 m / min.
In this production example, the roll gap of the upper roll is 0.5 mm, the roll gap of the lower roll is 0.7 mm, and the movement speed (surface speed) of the outer peripheral surface of both the upper roll and the lower roll is the same as that of the base sheet. The impregnated sheet was produced so that it might become speed (2.0 m / min).
The obtained impregnated sheet had a thickness of 0.68 mm and a basis weight of 987 g / m ² .
The difference (W2 = W0−W1) between the width W1 of the impregnated sheet and the width (W0) of the original base sheet is measured, and this difference is divided by the width (W0) of the base sheet (W2 / W0 × 100%) was determined as the width shrinkage rate.
As a result, as shown in Table 1 below, the width shrinkage rate in this production example was 15.6%.

(Production example 2)
Same as Production Example 1 except that the moving speed (surface speed) of the upper roll is 2.5 m / min and the surface speed of the upper roll exceeds the transfer speed (2.0 m / min) of the base sheet. Thus, an impregnated sheet was produced.
The lower roll was rotated so that the surface speed was the same as the transfer speed of the base sheet in the same manner as in Production Example 1.
The impregnated sheet obtained in this production example had a thickness of 0.67 mm and a basis weight of 957 g / m ² .
In addition, the width shrinkage rate in this production example is 9.0%, and it can be confirmed that it is greatly improved compared to Production Example 1 in which the surface speed of the upper roll is the same as the transfer speed of the base sheet. It was.

(Production example 3)
An impregnated sheet was produced separately from Production Example 2 under the same conditions as in Production Example 2.
As a result, the obtained impregnated sheet had a thickness of 0.68 mm and a basis weight of 969 g / m ² .
Further, the width shrinkage rate observed in this production example was 8.8%.
As described above, in this manufacturing example, a result almost the same as that in Manufacturing Example 2 was obtained, and it was confirmed that stable product production was possible.

(Production example 4)
Impregnated sheet in the same manner as in Production Example 1, except that the upper roll moving speed (surface speed) was 3.0 m / min and the upper roll surface speed was 1.5 times the substrate sheet transfer speed. Was made.
The impregnated sheet obtained in this production example had a thickness of 0.69 mm and a basis weight of 975 g / m ² .
Further, the width shrinkage rate in this production example was 6.6%, and it was confirmed that the shrinkage of the base sheet was further improved as compared with Production Examples 2 and 3.
Furthermore, in Production Examples 1 to 3, pinholes were observed in the impregnated sheet, but in Production Example 4, pinholes were not observed and the base sheet was in a good anticorrosion compound. It was also confirmed that it was impregnated.
From this, it was found that setting the surface speed of the roll used for impregnation of the anticorrosive compound to be 1.5 times or more the transfer speed of the base sheet is particularly effective in preventing necking and pinholes.

(Examination 2: Examination of gap between lower rolls, production examples 5 and 6)
An impregnated sheet was produced in the same manner as in Production Example 2 except that the roll gap of the lower roll was changed to 0.8 mm (Production Example 5) and 0.6 mm (Production Example 6) instead of 0.7 mm.
As a result, as shown in Table 2 below, it was confirmed that the basis weight of the impregnated sheet, that is, the amount of the anticorrosive compound supported can be adjusted by a simple method of adjusting the roll gap of the lower roll.

(Examination 3: Examination of gap between upper rolls, production examples 7 and 8)
An impregnated sheet was produced in the same manner as in Production Example 2 except that the roll gap of the upper roll was changed to 0.7 mm (Production Example 7) and 0.3 mm (Production Example 8) instead of 0.5 mm.
As a result, as shown in Table 3 below, if the roll gap of the upper roll is excessively narrowed, the passage resistance of the base sheet is increased, and the upper roll is rotated at a surface speed faster than the transfer speed of the base sheet. It was also confirmed that the effect may be offset.

(Examination 4: Examination of gap of upper roll and gap of lower roll, production examples 9 to 16)
Except when the upper roll is rotating at a surface speed of 2.5 m / min, what kind of tendency is caused when the roll gap of the lower roll and the roll gap of the upper roll are changed as in Examinations 2 and 3. Was confirmed under the conditions of Production Examples 9 to 16 shown in Table 4 below.
As a result, it was confirmed that the same tendency as in Study 2 and Study 3 was exhibited except when the upper roll was rotating at a surface speed of 2.5 m / min.

  From the above, it can be seen that according to the present invention, the fiber sheet can be satisfactorily impregnated and supported with an anticorrosive compound that is not easily softened during heating.

  10: polyester non-woven fabric (fiber sheet), 20: upper roll, 30: lower roll, 40: anticorrosive compound supply device, 50: roll, A: anticorrosion compound, Z: transfer device, Z1: winder

Claims (4)

An anticorrosion tape in which the anticorrosive compound is supported on a base sheet made of the fiber sheet by performing an impregnation step of impregnating the fiber sheet with the anticorrosive compound while continuously transferring the belt-like fiber sheet in the longitudinal direction. An anticorrosion tape manufacturing method for producing
The total thickness of the anticorrosion compound and the fiber sheet is passed through the fiber sheet having the anticorrosion compound attached to both surfaces between a pair of rolls arranged in a path for transferring the fiber sheet and rotatably arranged around the rotation axis. Carrying out the impregnation step of impregnating the fiber sheet with the anticorrosive compound with the roll by passing the fiber sheet to which the anticorrosive compound is attached between the rolls so that the fiber sheet is thicker than the gap between the rolls, In the impregnation step, the roll is rotated so that the movement direction of the outer peripheral surface on the fiber sheet side is the same as the transfer direction of the fiber sheet, and the moving speed of the outer peripheral surface exceeds the transfer speed of the fiber sheet; The anticorrosion tape manufacturing method characterized by rotating the said roll so that it may become.   A pair of the rolls are arranged in a horizontal direction so that the axial direction of the rotating shaft is substantially horizontal, and the fiber sheet is passed through the arranged rolls from top to bottom. The anticorrosion tape manufacturing method of Claim 1 which implements the said impregnation process.   The anticorrosive tape manufacturing method according to claim 1 or 2, wherein an anticorrosive compound is further attached to the fiber sheet that has passed between the pair of rolls, and the fiber sheet to which the anticorrosive compound is attached is further passed between at least a pair of rolls. . A transfer device for continuously transferring a belt-like fiber sheet in the longitudinal direction, and a base sheet made of the fiber sheet by performing an impregnation step of impregnating the fiber sheet being transferred by the transfer device with an anticorrosive compound An anticorrosion tape manufacturing apparatus comprising an impregnation unit for producing an anticorrosion tape on which the anticorrosion compound is supported,
The impregnation part is arranged in a path for transferring the fiber sheet, and includes a pair of rolls arranged to be rotatable around a rotation axis,
A fiber sheet on which the anticorrosive compound is attached on both sides between the pair of rolls and the anticorrosive compound is attached so that the total thickness of the anticorrosive compound and the fiber sheet is larger than the gap between the rolls. The fiber sheet is impregnated with the anticorrosive compound by passing the sheet between the rolls, and in the impregnation process, the movement direction of the outer peripheral surface of the roll on the fiber sheet side is the position of the fiber sheet. The anticorrosion characterized in that the roll is rotated so as to be in the same direction as the transfer direction, and the roll is rotated so that the moving speed of the outer peripheral surface exceeds the transfer speed of the fiber sheet. Tape manufacturing equipment.

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