WO2015072519A1 - Anticorrosion sheet and method for manufacturing same - Google Patents

Abstract

　Provided is an anticorrosion sheet provided with a polyester nonwoven fabric and a petrolatum-based anticorrosive, the petrolatum-based anticorrosive being impregnated in the polyester nonwoven fabric, the fiber constituting the polyester nonwoven fabric having an average fineness of 12-50 dTex, and the polyester nonwoven fabric having a basis weight of 150-500 g/m² .

Description

Anticorrosion sheet and manufacturing method thereof Cross-reference of related applications

This application claims the priority of Japanese Patent Application No. 2013-234558, and is incorporated herein by reference.

The present invention relates to an anticorrosion sheet and a method for producing the same.

Conventionally, in various plants, a tape-shaped anticorrosion sheet (anticorrosion tape) is provided on the outer periphery of the pipe material in order to protect metal pipe materials such as gas and water pipes and electric pipes for laying electric wires from corrosion. By winding, an anticorrosive tape is used as a coating layer to suppress corrosion of the tube material to be adhered.
As an anticorrosion tape used for this type of application, a tape-like base sheet made of a nonwoven fabric or the like is impregnated with and supported by a petrolatum anticorrosive agent (see Patent Document 1 below).

Japanese Unexamined Patent Publication No. 06-184968

By the way, considering that other members collide with the anticorrosion sheet wound around the tube material to be adhered, and the anticorrosion property is impaired by opening a hole in the anticorrosion sheet, the anticorrosion sheet is wound around the pipe material thickly. Is preferred.
On the other hand, in order to increase the anticorrosion property, there is a problem that it takes time and effort to wind the conventional anticorrosion sheet around the adherend.
From such a viewpoint, in order to improve the anticorrosion property of a single anticorrosion sheet, it is conceivable to increase the amount of the petrolatum anticorrosive agent supported per unit area of the base sheet as compared with the conventional one.
However, simply increasing the basis weight of the base sheet to increase the amount of the petrolatum anticorrosive agent, the anticorrosion sheet tends to have air bubbles inside the base sheet, and as a result, the adherend It has the problem that corrosion protection becomes insufficient.

In view of the above problems, an object of the present invention is to provide an anticorrosion sheet having excellent anticorrosion properties and a production method for producing such an anticorrosion sheet.

The conventional anticorrosion sheet has a thickness of about 1 mm, and the nonwoven fabric constituting the base sheet is mainly composed of fibers having an average fineness of 10 dTex or less, for example, about 5 dTex.
And when this inventor earnestly examined in order to solve the said subject, compared with the conventional base material sheet, the petrolatum type | system | group anticorrosion compared with the conventional base material sheet by employ | adopting the polyester nonwoven fabric formed with the fiber of predetermined thickness as a base material sheet It has been found that the impregnation of the agent can be facilitated.
In addition, by adopting a base sheet having a predetermined basis weight in such a polyester nonwoven fabric, the amount of the petrolatum-based anticorrosive per unit area can be increased as compared with the conventional anticorrosive sheet, and entrainment of bubbles The inventors have found that a thick anticorrosion sheet in which the above is suppressed can be easily formed, and arrived at the present invention.

That is, the present invention comprises a polyester nonwoven fabric and a petrolatum anticorrosive agent, the polyester nonwoven fabric is impregnated with the polyester nonwoven fabric, and an average fineness of fibers constituting the polyester nonwoven fabric is 12 to 50 dTex. The present invention provides an anticorrosion sheet characterized in that the basis weight of the polyester nonwoven fabric is 150 to 500 g / m ² and a method for producing the anticorrosion sheet suitable for producing such an anticorrosion sheet.

Moreover, in one aspect of the anticorrosion sheet according to the present invention, the average fineness is 15 dTex or more. Moreover, in one aspect | mode of the manufacturing method of the anticorrosion sheet | seat which concerns on this invention, the said average fineness is 15 dTex or more.

Moreover, in one aspect of the method for producing an anticorrosion sheet according to the present invention, the anticorrosion sheet having an average thickness of 2 mm or more is produced.

The equipment block diagram which showed typically the manufacturing equipment of a corrosion prevention sheet.

Hereinafter, an anticorrosion tape will be described as an example as a preferred embodiment of the present invention.
The anticorrosive tape in the present embodiment includes a polyester nonwoven fabric (hereinafter also simply referred to as “nonwoven fabric”) as a base sheet and a petrolatum anticorrosive impregnated in the polyester nonwoven fabric.

As the nonwoven fabric used as the base sheet of the anticorrosion tape of the present embodiment, those having a basis weight of 150 to 500 g / m ² can be usually used, and those having a basis weight of 150 to 400 g / m ² are preferably used. be able to. When the basis weight of the nonwoven fabric is 150 g / m ² or more, it is possible to increase the amount of the petrolatum anticorrosive agent supported on the nonwoven fabric per unit area, and there is an advantage that the corrosion prevention sheet has excellent corrosion resistance. . When the basis weight of the nonwoven fabric is 500 g / m ² or less, it is possible to suppress bubbles from entering the petrolatum-based anticorrosive impregnated in the base sheet, and the anticorrosion sheet has excellent anticorrosive properties. There is.

The non-woven fabric is not particularly limited as long as it is mainly composed of polyester fibers. Polyethylene terephthalate (PET) fibers, polytrimethylene terephthalate fibers (PTT), polybutylene terephthalate (PBT) fibers, and polyethylene naphthalate. A phthalate fiber (PEN) or the like, or a mixture of a plurality of the above-mentioned fibers can be used.
Further, the nonwoven fabric may contain a small amount of fibers other than polyester fibers as long as it is mainly composed of polyester fibers.
Furthermore, the polyester fiber which is the main component of the nonwoven fabric may be formed of a mixed resin whose main component is a polyester resin.
Further, the main part is a fiber having a core-sheath structure in which the core part is made of polyester resin and the sheath part is made of other resin, or the sheath part is made of polyester resin and the core part is made of other resin. The non-woven fabric can be used as the polyester non-woven fabric for the base sheet.
The nonwoven fabric is preferably composed of fibers having a crimp (crimp) structure in that the impregnation and loading of the petrolatum anticorrosive agent can be made favorable, and the fibers are sufficiently entangled in the thickness direction. What is done is preferable.

As the 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 above all, the web obtained by carding the polyester fiber having crimps A stitch bond nonwoven fabric in which a plurality of sheets are stacked and stitched in the thickness direction is preferable.
The anticorrosion tape of this embodiment can suppress separation of oil from the petrolatum-based anticorrosive agent by adopting a fiber sheet such as a stitch bond nonwoven fabric as a base sheet.
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, when exhibiting high anticorrosion performance, it is preferable that the base sheet is formed so as not to be exposed on both the front and back surfaces of the anticorrosion tape.

It is important that the nonwoven fabric has an average fiber fineness of 12 to 50 dTex, and the average fineness is preferably 15 to 40 dTex, more preferably 15 to 30 dTex.
When the average fineness of the fiber is 12 dTex or more, there is an advantage that the amount of the petrolatum anticorrosive agent adhered to the nonwoven fabric per unit area can be increased, and the anticorrosion sheet has excellent anticorrosion properties. In addition, there is an advantage that the anticorrosion sheet can easily stand out and the thickness of the anticorrosion sheet can be set to a predetermined value or more. When the average fineness of the fibers is 50 dTex or less, there is an advantage that bubbles entering the petrolatum anticorrosive agent impregnated in the base material sheet can be suppressed, and the anticorrosion sheet has excellent anticorrosion properties.
About the said average fineness, it can measure by B method (simple method) of JISL1013: 2010.
In addition, for non-woven fabrics that are configured using fiber materials other than the fibers forming the web, such as yarns for stitching and binding webs in stitch-bonded non-woven fabrics, fiber materials such as the above-described yarns Of course, it is not necessary to have the above fineness.

As the petrolatum-based anticorrosive supported on the base sheet, the same one as that used in conventional anticorrosive tapes can be adopted, and includes oil components, fillers, and rust preventives, as defined in JIS K2235. And those having petrolatum 1 to 4 as the main component of the oil component can be employed.
Further, the petrolatum-based anticorrosive agent may contain an oily component prepared in the same texture as that of petrolatum with a petroleum wax or oil other than petrolatum together with a filler or a rust inhibitor.

Below, an example of a petrolatum anticorrosive adjusted to suppress separation of components such as oil is shown.
The petrolatum-based anticorrosive agent of this embodiment contains, as oil components, an oil that is a liquid oil at room temperature and normal pressure (for example, 20 ° C., 1 atm), and a wax that is a solid oil that is solid at normal temperature and pressure. Yes.
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 so-called semi-solids that do not cause flow.

The petrolatum anticorrosive of this embodiment contains the oil component, that is, the oil and the wax.
Furthermore, the petrolatum anticorrosive of this embodiment contains additives, such as a tackifier.

The oil component is preferably contained in the petrolatum anticorrosive agent in a proportion of 50% by mass to 70% by mass, more preferably 55% by mass to 65% by mass. preferable.

Examples of the wax include fatty acid ester waxes such as fatty acid amide waxes such as ethylene bis stearamide, hydrocarbon waxes, and the like.
Examples of the oil include naphthenic oil, high viscosity oil such as bright stock oil, and low viscosity paraffinic oil used as motor oil.
Especially, as the said petrolatum anticorrosive, what contains hydrocarbon wax and a naphthenic oil is preferable at the point that it can suppress that oil isolate | separates from a petrolatum anticorrosive.

The wax is a crystalline wax.
In the present specification, the term “crystalline wax” refers to a crystallization peak measured in a constant temperature heating process at 10 ° C./min using a differential scanning calorimeter (DSC). This means a wax that exhibits a crystallization peak of 10 J / g or more. The crystallization peaks are about 104 J / g for paraffin wax (melting point 43 ° C.), about 122 J / g for polyethylene wax (melting point 108 ° C.), and about 20 to 385 J / g for ester wax.

The hydrocarbon wax is preferably contained so that the proportion of the oil component is 50% by mass or more and 85% by mass or less, and more preferably 60% by mass or more and 75% by mass or less. .
Examples of the hydrocarbon wax include paraffin wax defined in JIS K2235, such as 120P, 125P, 130P, 135P, 140P, 145P, 150P, and 155P, and 150M, 160M, and 170M in the same standard. , 180M, 190M, etc., can be used.
Non-standard hydrocarbon waxes can also be used, for example, synthesized by reacting carbon monoxide, called Fischer-Tropsch wax, with hydrogen. It is also possible to employ those obtained by polymerization of ethylene or polyethylene thermal decomposition called polyethylene wax, or synthetic wax called polypropylene wax.
Further, the petrolatum anticorrosive may contain a hydrocarbon wax by a wax mainly composed of a hydrocarbon wax such as candelilla wax or slack wax.

Among these, in order to prevent the oil from separating from the petrolatum anticorrosive agent, it is preferable that the petrolatum anticorrosive agent contains a hydrocarbon wax having a melting point equal to or higher than the temperature expected in actual use of the anticorrosion tape. .
On the other hand, hydrocarbon waxes generally tend to increase in hardness as the melting point becomes higher. Therefore, when trying to use ones having an excessively high melting point, it is suitable for petrolatum anticorrosives at room temperature. In order to exhibit ductility, a large amount of liquid oil is contained, which may cause the oil to separate from the petrolatum anticorrosive.
For this reason, it is preferable to employ a hydrocarbon wax having a melting point of 75 ° C. or higher and 100 ° C. or lower.
The melting point of the hydrocarbon wax can be confirmed by the test method described in JIS K2235 “Petroleum wax”.

The hydrocarbon wax having a melting point of 75 ° C. or more and 90 ° C. or less preferably has a ratio of 50% by mass to 100% by mass based on all hydrocarbon waxes contained in the petrolatum anticorrosive. It is more preferably 100% by mass or less, and particularly preferably 85% or more and 100% by mass or less.
The hydrocarbon wax having a melting point of 75 ° C. or more and 90 ° C. or less is preferably contained at a ratio of 0.75 times or more with respect to the total mass of all liquid oils contained in the petrolatum anticorrosive.

The naphthenic oil is not particularly limited as long as it contains a saturated ring structure such as cyclopentane or cyclohexane in the molecule, and commercially available products can be used.

The naphthenic oil is preferably contained in the petrolatum anticorrosive so that the proportion of the naphthenic oil in the oil component is 15% by mass or more and 50% by mass or less, and is 25% by mass or more and 40% by mass or less. Thus, it is more preferable to make it contain in a petrolatum anticorrosive.

The tackifier is an important component for imparting appropriate surface tackiness to the petrolatum-based anticorrosive agent and exhibiting excellent adhesion to an object to be protected such as piping on the anticorrosion tape.
Examples of the tackifier include natural rubber and synthetic rubber. Examples of the synthetic rubber include room temperature liquid polybutene, which is a low polymer of isobutylene, and room temperature solid polyisobutylene obtained by highly polymerizing isobutylene. Is mentioned.
Moreover, tackifiers, such as an alicyclic saturated hydrocarbon resin, can also be contained in the petrolatum anticorrosive of this embodiment.
Each of these tackifiers is a single type for exhibiting excellent surface adhesion to the anticorrosive tape under a wide range of conditions in order to change the tackifying effect on the petrolatum anticorrosive agent depending on the temperature conditions, etc. It is preferable to use a plurality of these in combination with the petrolatum anticorrosive agent.
That is, the petrolatum anticorrosive agent preferably contains a plurality of polybutenes, polyisobutylenes, and alicyclic saturated hydrocarbon resins, and these three kinds of tackifiers are all contained in the petrolatum anticorrosive agent. It is preferable.
The tackifier is preferably contained in the petrolatum anticorrosive so that the total amount is 4 to 7 parts by mass with respect to 100 parts by mass of the oil component.

In addition to the tackifier, the petrolatum-based anticorrosive agent includes, for example, inorganic fillers such as calcium carbonate, clay, talc, silica, alumina; rust inhibitor, fungicide, antibacterial agent, weathering agent, gloss Functional agents such as agents; pigments and the like can be added as additives.

The anticorrosive tape according to the present embodiment is a separator laminated on one surface side of the anticorrosive tape main body in addition to the anticorrosive tape main body in which the petrolatum anticorrosive is impregnated in the polyester nonwoven fabric before being wound around the adherend. You may be in the state provided with the 1st resin sheet and the 2nd resin sheet which is the separator laminated | stacked on the other surface side of the anticorrosion tape main body.
Examples of the material for the resin sheet include polyamide, polyester, and polyolefin. In addition, polyolefin is preferable and polypropylene is more preferable from the viewpoint of excellent oil resistance and further facilitating sticking of the anticorrosion tape to the curved surface portion. The polypropylene may be unstretched or stretched. The polypropylene may be a single layer or a laminated layer. As the resin sheet, a colored resin sheet may be used in order to impart design properties or improve workability.
The thickness of each resin sheet (the thickness of each of the first resin sheet and the second resin sheet) is preferably 10 to 100 μm, more preferably 15 to 60 μm, and even more preferably 20 to 40 μm. When the thickness is 10 to 100 μm, there is an advantage that the oil resistance is excellent, the mechanical strength is increased, and the anticorrosion tape body can be easily wound around the adherend.
The anticorrosion tape which concerns on this embodiment can suppress that a petrolatum type | system | group anticorrosive agent isolate | separates from a polyester nonwoven fabric, before wrapping an anticorrosion tape main body around a to-be-adhered body by providing this resin sheet.

The anticorrosion tape according to the present embodiment is different in the amount of impregnation of the petrolatum anticorrosive agent on one side and the other side of the nonwoven fabric from the viewpoint of different adhesive strength between the one side and the other side of the anticorrosion tape body. Good.
In this case, the design of the first resin sheet and the second resin sheet may be different. By doing so, the surface where the amount of impregnation of the petrolatum anticorrosive agent is large and the surface where the amount is small can be easily recognized. For example, a polka dot pattern is given to the first resin sheet, and the second resin sheet is made non-patterned.

In the anticorrosive tape according to this embodiment, the amount of the petrolatum anticorrosive agent adhered to the base sheet per unit area is preferably 2.0 to 3.5 kg / m ² , more preferably 2.5 to 2.8 kg. / M ² .
When the adhesion amount is 2.0 kg / m ² or more, there is an advantage that the anticorrosion sheet has excellent anticorrosion properties.
Further, when the adhesion amount is 3.5 kg / m ² or less, there is an advantage that the anticorrosion tape can be easily wound. Further, the anticorrosion tape has an advantage that it is easy to be peeled off when the separator is peeled off from the main body of the anticorrosion tape because the adhesion amount is 3.5 kg / m ² or less.

In the anticorrosion tape according to this embodiment, the thickness of the anticorrosion tape body is preferably 2.0 to 5.0 mm, more preferably 2.0 to 3.5 mm, and still more preferably 2.0 to 2.5 mm. .
When the thickness is 2.0 mm or more, there is an advantage that the anticorrosion sheet has excellent anticorrosion properties. Moreover, when this thickness is 5.0 mm or less, there exists an advantage that it is easy to wind an anticorrosion tape.

Next, the manufacturing method of the anticorrosion tape which concerns on this embodiment is demonstrated.
The method for producing an anticorrosion tape according to this embodiment is a method for producing an anticorrosion sheet comprising a non-woven fabric and a petrolatum-based anticorrosive carried on the non-woven fabric.
The anticorrosion tape manufacturing method according to the present embodiment includes a compression step of heating a polyester nonwoven fabric and compressing the nonwoven fabric in the thickness direction, and a petrolatum anticorrosive agent that is heated and has a lower viscosity than that at room temperature. And an impregnation step of impregnating the nonwoven fabric.

Hereinafter, a method for producing an anticorrosion tape in which the surface of the base sheet is suppressed from being exposed while using the polyester nonwoven fabric that has been stitch bonded to the base sheet will be described as an example.
The anticorrosion tape manufacturing method of this embodiment produces a long strip | belt-shaped anticorrosion sheet | seat, and slit-processes this to the appropriate width | variety and makes it an anticorrosion tape.
First, an apparatus configuration suitable for manufacturing the anticorrosion sheet will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram illustrating a production facility for producing the anticorrosion tape of the present embodiment. As shown in the figure, the production method uses a base sheet roll 1 in which a long strip of polyester nonwoven fabric is rolled.
In addition, in the production equipment for producing the anticorrosive tape of the present embodiment, the petrolatum anticorrosive was heated as shown in the figure, and the viscosity was lower than that at room temperature (for example, 20 ° C.). A paste tank 2 for storing the petrolatum anticorrosive is provided.
Furthermore, in the manufacturing equipment of the present embodiment, the base sheet roll 1 is rotatably held, and the base sheet roll 1 is rotated and the polyester nonwoven fabric 10 fed from the outside thereof is transferred to the paste tank 2. A delivery device 3 for sending out is provided.

In the manufacturing facility of the present embodiment, a petrolatum anticorrosive agent is disposed on the polyester nonwoven fabric 10 that is disposed on the opposite side of the sending machine 3 with the paste tank 2 interposed therebetween and is sent from the sending machine 3 in the paste tank 2. A winder 4 is further provided which takes up the anticorrosion sheet 11 obtained by impregnation and winds it in a roll shape.

Further, the manufacturing facility of the present embodiment includes a pair of heating rolls 51, and sandwiches the polyester nonwoven fabric 10 sent from the feeder 3 before the paste tank 2 between the pair of heating rolls 51, and the polyester A hot set machine 5 that compresses the nonwoven fabric 10 by heating in the thickness direction is provided.
In addition, in the manufacturing facility of the present embodiment, the polyester nonwoven fabric 10 ′ (hereinafter also referred to as “impregnated sheet 10 ′”) impregnated and supported by the petrolatum anticorrosive agent after passing through the paste tank 2 is extra. A thickness controller 6 is provided for scraping off the petrolatum-based anticorrosive adhering to the surface to form the anticorrosive sheet 11 having a predetermined thickness.

And in the manufacturing equipment of this embodiment, the cooler 7 for forcibly cooling the anticorrosion sheet 11 that has passed through the thickness controller 6 and has a predetermined thickness includes the thickness controller 6 and the winder 4. It is prepared between.

In the manufacturing equipment for producing the anticorrosive sheet of this embodiment, the polyester non-woven fabric 10 fed out from the feeder 3 on which the base sheet roll 1 is mounted becomes the anticorrosive sheet 11 and is wound by the winder 4. The polyester nonwoven fabric 10 and the anticorrosion sheet 11 are configured to travel at a substantially constant speed.

That is, the manufacturing equipment of the present embodiment is a petrolatum-based anticorrosion in a heated and melted state in which the polyester nonwoven fabric 10 fed out from the delivery machine 3 and continuously compressed by the hot set machine 5 is stored in the paste tank 2. The polyester nonwoven fabric 10 is configured to be impregnated with a petrolatum anticorrosive while passing through the agent. Further, in the manufacturing facility of the present embodiment, the impregnated sheet 10 ′ that has passed through the paste tank 2 is adjusted to the amount of the petrolatum-based anticorrosive agent by the thickness controller 6 to be the anticorrosion sheet 11. It is configured. Furthermore, the manufacturing equipment of this embodiment is configured such that the anticorrosion sheet 11 is cooled by the cooler 7 and wound by the winder 4.

As the delivery device 3, for example, it is possible to adopt a configuration that can send out the polyester nonwoven fabric 10 at a constant speed while applying an appropriate brake.

The hot set machine 5 is configured to compress the polyester nonwoven fabric 10 delivered from the delivery machine 3. The hot setting machine 5 is provided in the manufacturing facility of the present embodiment in order to suppress the fuzz of the stitch bond nonwoven fabric and introduce it into the paste tank 2.
That is, the hot set machine 5 is provided in the anticorrosion sheet manufacturing facility so as to exert a function of ironing the polyester nonwoven fabric 10 with the heating roll 51.
Therefore, as the hot set machine 5, it is preferable that the heating roll 51 has a sufficient heating capability and has a smooth surface.

In order to impregnate and carry the petrolatum anticorrosive agent on the polyester nonwoven fabric 10 compressed by the hot set machine 5, the petrolatum anticorrosive agent is heated to a temperature equal to or higher than the melting point of the wax contained in the petrolatum anticorrosive agent. Thus, it is preferable to sufficiently lower the viscosity of the petrolatum anticorrosive.
Therefore, it is preferable to employ a paste tank 2 having a heating capability capable of sufficiently reducing the viscosity of the petrolatum anticorrosive.

Note that the temperature of the petrolatum anticorrosive in the paste tank 2 does not have to be higher than the melting point of all the waxes contained in the petrolatum anticorrosive, and may be higher than the melting point of the hydrocarbon wax. .
For example, in the case of a petrolatum corrosion inhibitor mainly composed of a hydrocarbon wax having a melting point of about 80 ° C., it has a melting point of about 145 ° C. such as ethylenebisstearic acid amide when heated to a temperature of about 100 ° C. to 140 ° C. Since the viscosity of the petrolatum anticorrosive can be sufficiently reduced even when it contains a wax, the paste tank 2 does not need to have an excessive heating capability.

As the paste tank 2, for example, a winding roll 21 for winding the polyester nonwoven fabric 10 is arranged on the tank bottom, and the polyester nonwoven fabric 10 supplied from the hot set machine 5 is wound around the winding roll 21. What was comprised so that it could send out toward the said thickness control machine 6 after being immersed in the petrolatum type | system | group anticorrosive of a heat-melting state is employable.

The thickness controller 6 is provided with a member for passing through the paste tank 2 and impregnating with the petrolatum anticorrosive, contacting the loaded impregnated sheet 10 'and scraping off the excess petrolatum anticorrosive. Can be used. For example, as the thickness controller 6, the first thickness regulation for scraping off the petrolatum-based anticorrosive which is brought into contact with the one surface side of the impregnated sheet 10 'and excessively adhered to the surface of the one surface side. A second member 61 is used to scrape off the petrolatum anticorrosive agent which is brought into contact with the impregnated sheet 10 'from the other surface side opposite to the one surface side and is excessively adhered to the surface on the other surface side. It is possible to employ one having a thickness regulating member 62.

In addition, as the 1st thickness control member 61 or the 2nd thickness control member 62, the plate-shaped thing and roll-shaped thing whose length is longer than the width | variety of the said polyester nonwoven fabric 10 pulled up from the said paste tank 2 are used. Can be adopted.
As the thickness regulating members 61 and 62, a petrolatum anticorrosive agent on the surface of the impregnated sheet is smoother when a member having a curved surface is brought into contact with the impregnated sheet 10 ′ than with an angular member. Since it is easy to obtain a uniform thickness, it is preferable to adopt a roll shape.

In the present embodiment, the stitch bond nonwoven fabric used as the base sheet is usually observed as one knitted yarn being two on one side 10a and one on the other side 10b. It is formed so that. The stitch bond nonwoven fabric is in a tight state with fewer voids on the side where two stitches are observed compared to the side where only one stitch is observed.

That is, the polyester nonwoven fabric 10 in the present embodiment is less likely to be impregnated with the petrolatum anticorrosive agent than the other surface side 10b on the one surface side 10a on the second stitch side than on the one surface side 10a. In this case, the surface is less likely to carry the petrolatum anticorrosive agent on the surface.

From this, the thickness controller 6 is configured so that the first thickness regulating member 61 and the second thickness regulating member 62 are simultaneously brought into contact with the impregnated sheet 10 ′ so that the one surface side 10a ′ and the other surface side. A difference is likely to occur in the amount of petrolatum anticorrosive supported on the surface of 10b ′.
Therefore, about the said thickness control machine 6, the timing which regulates the loading amount of the petrolatum type | system | group anticorrosive agent to the polyester nonwoven fabric 10 by the 1st thickness control member 61 in the said one surface side 10a, and 2nd in the said other surface side 10b. It is preferable to set separately the timing at which the amount of the petrolatum anticorrosive is regulated by the thickness regulating member 62. In addition, with respect to the thickness controller 6, it is preferable that the thickness regulating members 61 and 62 be offset with respect to the traveling direction of the impregnated sheet 10 ′.

That is, as the thickness controller 6 of this embodiment, a roll having a length longer than the width of the polyester nonwoven fabric 10 is employed as the first thickness regulating member 61 and the second thickness regulating member 62, A roll that is the thickness regulating member 61 (hereinafter, also referred to as “first roll 61”) and a roll that is the second thickness regulating member 62 (hereinafter, also referred to as “second roll 62”) are offset. preferable.

In the following, with respect to a preferred embodiment of the thickness controller 6, the impregnated sheet 10 ′ is pulled up vertically from the paste tank 2, and the thickness controller 6 is disposed above the paste tank 2 as an example. Will be described in more detail.

In the thickness controller 6, the first roll 61 brought into contact with one surface side 10 a ′ of the impregnated sheet 10 ′ and the second roll 62 brought into contact with the other surface side 10 b ′ of the impregnated sheet 10 ′. Is arranged such that the axial direction is substantially horizontal and the axial directions are substantially parallel to each other.
As described above, the first roll 61 is arranged higher than the second roll 62.
Accordingly, the first roll 61 is disposed so as to be parallel to the second roll 62 obliquely on the upper side.
Moreover, as shown in the figure, the first roll 61 and the second roll 62 are not only arranged offset (displaced) in the vertical direction, but also their side edges are perpendicular to the vertical line. They are arranged differently.
In other words, the second roll 62 on the lower side in the vertical direction has a perpendicular line passing through the side edge on the first roll side (the phantom line C in FIG. 1) on the second roll side of the first roll 61 on the upper side. It is distribute | arranged so that it may pass between a side edge and a central axis.
Similarly, in the first roll 61, a perpendicular (imaginary line D in FIG. 1) passing through the side edge on the second roll side passes between the side edge on the second roll side of the first roll 61 and the central axis. Is arranged.

Accordingly, after the impregnated sheet 10 ′ pulled up from the paste tank 2 is bent slightly so that the second roll 62 is brought into contact with the other surface side 10b ′ and the one surface side 10a ′ is on the outside. The first roll 61 is brought into contact with the one surface side 10a 'and passes through the thickness controller 6 in a slightly bent shape so that the other surface side 10b' is on the outside, contrary to the previous case. become.

Further, the first roll 61 and the second roll 62 are arranged in the thickness controller 6 with a gap larger than the thickness of the anticorrosion sheet to be produced.

The first roll 61 is provided in the thickness controller 6 so as to rotate so that the outer peripheral surface in contact with the impregnated sheet 10 ′ moves in a direction opposite to the moving direction of the impregnated sheet 10 ′. .
In this embodiment, the first roll 61 has substantially the same length, and the distance can be adjusted while making the distance from the outer peripheral surface of the first roll 61 substantially constant in the axial direction. The thickness controller 6 is further provided with an adjusting member 63 arranged in the above manner.

The first roll 61 has a function of scraping off an excessive petrolatum anticorrosive adhering to the one surface side 10a 'of the impregnated sheet 10'. Further, the first roll 61 is more likely to be exposed because the one side 10a of the polyester nonwoven fabric 10 on the side of the second stitch is tightly tightened, and the yarn is more easily exposed. It is rotated so as not to be exposed, and is used in combination with the adjusting material 63.

In the polyester nonwoven fabric 10, the tension on the impregnated sheet 10 ′ is changed because the one side 10a is tightly tightened, and a stronger tension is generated on the impregnated sheet 10 ′ than before. At that time, the petrolatum anticorrosive is easily scraped off.
For this purpose, the first roll 61 passes the excess petrolatum-based anticorrosive agent carried on its outer peripheral surface between the adjustment material 63 by rotation, and sets the thickness of the petrolatum-based anticorrosive agent on the entire outer peripheral surface to a predetermined value. The thickness is adjusted so that the petrolatum anticorrosive having the adjusted thickness is attached to the surface of the impregnated sheet 10 'again, and in this way, it is more sure that the yarn is exposed on the surface of the anticorrosion tape. It is provided in the thickness controller 6 to prevent it.

On the other hand, since the other surface side 10b of the polyester nonwoven fabric 10 is relatively flexible, it is difficult to cause a change in the amount of the petrolatum anticorrosive supported due to a change in tension or the like.
Therefore, the second roll 62 may be configured to be provided with a regulating member and rotated in the same manner as the first roll 61, but may be provided in the thickness controller 6 so as to be stationary.

The first roll 61 and the second roll 62 have a petrolatum anticorrosive supported on the impregnated sheet 10 'by contact with the impregnated sheet 10' below the crystallization temperature of the wax as a main component. If it is allowed to cool, the viscosity of the petrolatum anticorrosive will suddenly increase and the petrolatum anticorrosive may be peeled off from the polyester nonwoven fabric 10, so that the surface temperature exceeds the crystallization temperature, and the thickness It is preferable to have a heating function to maintain the petrolatum anticorrosive agent at a temperature exceeding the crystallization temperature until it passes through the controller 6.

As the first roll 61 and the second roll 62, a metal roll having a diameter of 100 mm to 350 mm and having a flow path for an electric heater or a heat medium can be adopted.

And the said cooling machine 7 for forcibly cooling the anticorrosion sheet which passed this thickness control machine 6 uses the gas of the temperature lower than the crystallization temperature of the wax of the said petrolatum type anticorrosive agent, and the petrolatum type anticorrosive agent of the said anticorrosion sheet | seat Or a cooling roller that is brought into contact with the anticorrosion sheet and moves along with the movement of the anticorrosion sheet.

The cooler 7 is preferably configured to blow a gas having a temperature lower than the crystallization temperature of the petrolatum anticorrosive wax onto the petrolatum anticorrosive of the anticorrosion sheet. By having such a configuration, the cooler 7 can cool a relatively wide range of the surface of the anticorrosion sheet.
As the gas, it is preferable to use a gas containing moisture. By using a gas containing moisture, the petrolatum anticorrosive of the anticorrosion sheet can be efficiently cooled by the latent heat of vaporization of water.
Further, as the gas containing moisture, it is more preferable to use a gas (for example, mist) containing fine water particles. When moisture-containing gas is sprayed onto the anticorrosion sheet, the water particles may collide with the uncured petrolatum anticorrosive agent, resulting in dents on the surface of the anticorrosion tape, but the smaller the water particle size, the larger the dents. It is because it can be made small.
The water particles preferably have a particle size of 50 μm or less, more preferably 1 to 20 μm.

Further, the winder 4 is not particularly limited, and a winder configured to take up the anticorrosion sheet at a constant speed and wind it in a roll shape can be adopted.

Subsequently, the manufacturing method which manufactures an anticorrosion tape using such a manufacturing facility is demonstrated.
First, the base sheet roll 1 is set in the delivery machine 2, the belt-like polyester nonwoven fabric 10 is fed out from the outside of the base sheet roll 1, and is fed out between the pair of heating rolls 51 provided in the hot setting machine 5. After passing the polyester nonwoven fabric 10 passed, the polyester nonwoven fabric 10 is wound around a winding roll 21 of the paste tank 2, and the tip of the polyester nonwoven fabric 10 is passed through the thickness controller 6 to the winder 4. Carry out the paper passing work.
At this time, in the thickness controller 6, the outer peripheral surface of the first roll 61 is brought into contact with the one surface side 10 a of the polyester nonwoven fabric 10 over the entire width, and the first roll is formed over the entire width with the other surface side 10 b of the polyester nonwoven fabric 10. Appropriate tension is generated in the polyester nonwoven fabric 10 so that the outer peripheral surface of 62 is brought into contact with each other and the contact pressure between the rolls 61 and 62 and the polyester nonwoven fabric 10 is adjusted.

After that, the paste tank 2 is heated and melted with the petrolatum anticorrosive agent and kept at a predetermined temperature, and the heating roll 51 of the hot set machine 5, the first roll 61 and the second roll 62 of the thickness controller 6 are set to a predetermined temperature. Set to temperature.
Then, after determining the distance between the first roll 61 and the adjusting material 63 and the rotational speed of the first roll 61, the operation of the manufacturing facility is started.

In this manufacturing method, the polyester nonwoven fabric 10 compressed by the heating roll 51 of the hot set machine 5 is introduced into the paste tank 2, so that the fuzz of the polyester nonwoven fabric 10 is suppressed and the heat melting stored in the paste tank 2 is retained. The thickness of the polyester nonwoven fabric 10 once compressed in the petrolatum anticorrosive in the state is restored to some extent, and the impregnation property of the petrolatum anticorrosive with respect to the polyester nonwoven fabric is improved.

In addition, it becomes as follows when the compression process implemented with the hot set machine 5 is explained in full detail.
The hot set machine 5 is provided with a pair of heating rolls that are pivotally supported so that the rotation axis is in the horizontal direction, and is parallel to each other in the horizontal direction, and the compression process is performed on the two heating rolls. The polyester nonwoven fabric 10 is wound around an S-shape (more precisely, a shape obtained by rotating the S-shape by 90 degrees).
That is, when the polyester nonwoven fabric 10 is passed through the two heating rolls, the polyester nonwoven fabric 10 is heated by contact with the heating roll, and the polyester nonwoven fabric 10 passes between the two heating rolls. In addition, the polyester nonwoven fabric 10 is compressed in the thickness direction with the heating roll to perform the compression step.

At this time, for example, if the compression step is performed on a polyester nonwoven fabric having an average fineness of 15 to 20 dTex, a basis weight of 150 to 400 g / m ² , and a thickness of 3.0 to 6.0 mm, usually, The compression step can be performed by setting the temperature of the heating roll to 170 to 180 ° C., and the total time for the polyester nonwoven fabric 10 to contact the heating roll to 10 to 15 seconds.
When the thickness of the original polyester nonwoven fabric 10 is T (mm), the ratio (D / T) of the gap D (mm) between the heating rolls to the thickness is usually 0.40 to 0.60. be able to.

In the case of a polyester nonwoven fabric having a web in which fibers having a crimped structure are carded, the web is formed in a state in which the fibers are stretched from the original crimped state by the card. In addition, it is potentially heat shrinkable.
That is, the polyester nonwoven fabric may be shrunk by heating the fibers to soften the fibers and returning the fibers to the original crimped state.
And like the polyester nonwoven fabric of this embodiment, in the conventional anticorrosion tape, what has a large basis weight compared with what is utilized for a base material sheet has a possibility that a contraction force may also become large.
Therefore, as described later, the compression step not only exhibits the effect of promoting the impregnation of the petrolatum anticorrosive agent into the polyester nonwoven fabric but also wraps the anticorrosion tape around the pipe material, etc. It is carried out to prevent the collapse due to the shrinkage.

More specifically, in this compression step, the polyester nonwoven fabric can be returned to a natural crimped state to some extent by heating the polyester nonwoven fabric while compressing the polyester nonwoven fabric in the thickness direction with the heating roll 51. Can be suppressed.
In addition, the compression process causes the fibers to become dense and the polyester nonwoven fabric is tightened, so that the anticorrosion tape can be made excellent in tensile strength. For example, the anticorrosion tape has a high tension during construction. It is possible to prevent the anticorrosion tape from being carelessly cut even when the is added.

The details of the impregnation step of impregnating the polyester nonwoven fabric subjected to this compression step with the petrolatum-based anticorrosive agent are as follows.
Here, a case where a high melting point wax such as ethylenebisstearic acid amide is contained in the petrolatum anticorrosive will be described as an example.
When the polyester nonwoven fabric is impregnated with such a petrolatum anticorrosive, the temperature of the petrolatum anticorrosive in the paste tank is set to 135 ° C. to 140 ° C., and the petrolatum anticorrosive is sufficiently low compared to the normal temperature state. Viscosity is preferred.

When the polyester nonwoven fabric is immersed in a petrolatum anticorrosive at 135 ° C. to 140 ° C., the polyester nonwoven fabric compressed in the compression step has a pressure that allows the petrolatum anticorrosive to penetrate into the inside by capillary action. And the thickness is restored by heating with a petrolatum anticorrosive.
At this time, since the function of sucking the petrolatum anticorrosive into the inside occurs with the recovery of the thickness, it is possible to suppress the bubbles from remaining in the polyester nonwoven fabric after the impregnation step.

This thickness recovery is mainly achieved by utilizing the force of the fibers that have been bent due to compression to recover, so that the fibers of the polyester nonwoven fabric are prominent. It becomes.
Therefore, in the conventional anticorrosion tape in which the base sheet of fine fibers is used, the above function cannot be expected so much.
Moreover, for example, a polyester nonwoven fabric mainly composed of fibers having a thickness of 10 dTex or less is easily impregnated with a petrolatum-based anticorrosive for those having a large basis weight (thickness) because they tend to be clogged between the fibers. Even if it tries to make it, there exists a possibility that a petrolatum type | system | group anticorrosive agent may have a bubble inside without reaching to the center part of the thickness direction.

Moreover, in the case where a non-woven fabric in which a forced space is formed between thin fibers is used for the base material sheet, it becomes difficult to sufficiently provide the tensile strength required for the anticorrosion tape and is wound in a roll shape. When the anticorrosion tape is fed out from the outside, there is a risk of causing problems such as so-called “layer cracking” in which the anticorrosion tape wound inside the anticorrosion tape causes cohesive failure in the thickness direction.
That is, in this embodiment, a thick anticorrosive tape is produced by the synergistic effect of adopting a polyester nonwoven fabric with a large fiber thickness for the base sheet and performing the compression step and the impregnation step as described above. Can be formed while suppressing the possibility of bubbles being formed inside.

After the impregnation step, the impregnated sheet 10 ′ taken out from the paste tank 2 is introduced into the thickness controller 6, and the petrolatum adhering excessively to the one surface side 10 a ′ and the other surface side 10 b ′. The anticorrosion sheet can be formed by scraping off the anticorrosive agent using the outer peripheral surfaces of the rolls 61 and 62 and adjusting the thickness to a predetermined thickness.
In the thickness controller 6, the first roll 61 and the second roll 62 are arranged in a state offset as above and below. With respect to the anticorrosion sheet, the one surface side 10 a opposite to the other surface side 10 b ′ is first adjusted after the amount of the petrolatum anticorrosive agent supported on the other surface side 10 b ′ of the impregnated sheet 10 ′ is adjusted by the second roll 62. The amount of the petrolatum-based anticorrosive supported by 'is adjusted by the first roll 61 and the adjusting material 63.

Conventional thickness control machines are generally configured using two long blades. In addition, the conventional thickness controller is arranged so that the blades face each other and the distance between the blades is the finished thickness of the anticorrosion sheet, and the impregnated sheet is passed through the blade. Has been.
Therefore, the anticorrosion sheet obtained by passing through a conventional thickness controller is uniform in thickness and excellent in surface smoothness.
On the other hand, the conventional anticorrosive sheet has a locally reduced amount of petrolatum anticorrosive on the surface when a substrate sheet having a relatively large surface irregularity such as a stitch bond nonwoven fabric is adopted. In some cases, the surface of the base sheet may be exposed.

In contrast, in the present embodiment, the outer peripheral surfaces of the rolls 61 and 62 are used for scraping off the petrolatum-based anticorrosive agent instead of using a member having a sharp edge such as a blade.
While the blade is in substantially line contact with the impregnated sheet, the rolls 61 and 62 can ensure a wide contact width with the impregnated sheet 10 ′. A high contact pressure can be prevented from acting locally in the meantime.
Moreover, in the present embodiment, while the impregnated sheet 10 ′ is in contact with the first roll 61 or the second roll 62, another member is not brought into contact with the opposite surface.
Therefore, the impregnated sheet 10 ′ can be easily moved away from the rolls 61 and 62 while in contact with the rolls 61 and 62, and the possibility that the petrolatum anticorrosive is scraped off excessively can be suppressed.
In addition, in this embodiment, the petrolatum anticorrosive agent carried on the outer peripheral surface of the first roll 61 with a predetermined thickness by the gap adjustment between the adjustment material 63 and the first roll 61 is separated from the first roll 61. Since it is transferred to one side 10a ′ of the impregnated sheet 10 ′ that goes, the one side is higher in density (fiber density) than the other side as in the case of a stitch-bonded nonwoven fabric, and is tightly tightened Even so, the surface exposure of the base sheet can be more reliably suppressed by passing the thickness controller 6 so that the tightly tightened side becomes the second roll 62 side.

The amount of the petrolatum anticorrosive agent supported on each surface of the anticorrosion sheet is determined by the tension of the impregnated sheet 10 'in the thickness controller (the pressing force to the first roll 61 and the second roll 62), the first roll 61 It can be adjusted by the temperature and rotation speed of the second roll 62 or the like.

After passing through the thickness controller 6, the anticorrosion sheet is forcibly cooled by the cooler 7 and wound by the winder 4. In the cooling by the cooler 7, the base sheet is used. It is preferable to forcibly cool the petrolatum-based anticorrosive agent supported on the catalyst from a temperature exceeding the crystallization temperature of the wax to a temperature lower than the crystallization temperature.
The crystallization temperature means a peak temperature of a crystallization peak measured in a constant speed heating process at 10 ° C./min using a differential scanning calorimeter (DSC).
More specifically, the forced cooling of the anticorrosion sheet by the cooler 7 is such that the temperature of the petrolatum anticorrosive becomes a cooling rate of 2 ° C./second or more before and after the crystallization temperature of the wax on the surface of the anticorrosion sheet. The cooling rate is more preferably 5 ° C./second or more, and particularly preferably 10 ° C./second or more.
More preferably, the inside of the anticorrosion sheet is carried out so as to achieve the above cooling rate. That is, the inside of the anticorrosion sheet is preferably carried out so that the temperature of the petrolatum anticorrosive agent becomes a cooling rate of 2 ° C./second or more before and after the crystallization temperature of the wax, and the cooling rate is 5 ° C./second. More preferably, it is more preferably 10 ° C./second or more.
When multiple types of wax are contained in the petrolatum anticorrosive and multiple crystallizations occur at different temperatures, the effect is exhibited even if forced cooling is performed at any crystallization temperature. It is preferable to perform forced cooling in a large temperature range.

Thus, the petrolatum anticorrosive after cooling is forcibly performed until the temperature of the petrolatum anticorrosive exceeds the crystallization temperature of the wax to a temperature lower than the crystallization temperature. The wax in can be microcrystallized.
That is, since the wax exhibits the property of taking in liquid oil between the crystal regions, it is possible to improve the trapping ability of oil as liquid oil by microcrystallizing the wax as described above.

In addition, after cooling as described above, the anticorrosion sheet may be wound as it is with the winder 4, or may be wound with a separate film interposed therebetween.
The wound anticorrosion sheet can be used as an anticorrosion tape after being slit as it is or with an appropriate width.

As mentioned above, the anticorrosion sheet | seat which concerns on this embodiment is equipped with the polyester nonwoven fabric and the petrolatum anticorrosive. The polyester nonwoven fabric is impregnated with the petrolatum anticorrosive. The average fineness of the fibers constituting the polyester nonwoven fabric is 12 to 50 dTex. The basis weight of the polyester nonwoven fabric is 150 to 500 g / m ² .
Such an anticorrosion sheet has excellent anticorrosion properties.
Furthermore, in the anticorrosion sheet according to this embodiment, the average fineness is preferably 15 dTex or more.

Moreover, in the manufacturing method of the anticorrosion sheet | seat which concerns on this embodiment, the anticorrosion sheet | seat provided with the polyester nonwoven fabric and the petrolatum anticorrosive agent and the said petrolatum anticorrosive agent is impregnated in the said polyester nonwoven fabric is produced. The method for producing the anticorrosion sheet includes a compression step in which the polyester nonwoven fabric is heated and compressed in the thickness direction, and a petrolatum anticorrosive agent that has been heated and has a viscosity lower than that at room temperature is compressed in the compression step. An impregnation step for impregnating the polyester nonwoven fabric. The average fineness of the fibers constituting the polyester nonwoven fabric is 12 to 50 dTex. The basis weight of the polyester nonwoven fabric is 150 to 500 g / m ² .
According to such a method for producing an anticorrosion sheet, an anticorrosion sheet having excellent anticorrosion properties can be provided.
Furthermore, in the manufacturing method of the anticorrosion sheet which concerns on this embodiment, it is preferable that the said average fineness is 15 dTex or more.

Moreover, in the manufacturing method of the anticorrosion sheet which concerns on this embodiment, the said anticorrosion sheet whose average thickness is 2 mm or more is produced.

Note that the anticorrosion sheet of the present invention and the method for producing the anticorrosion sheet of the present invention are not limited to the configuration of the above embodiment. Moreover, the anticorrosion sheet of this invention and the manufacturing method of the anticorrosion sheet of this invention are not limited to an above-described effect. The anticorrosion sheet of the present invention and the method for producing the anticorrosion sheet of the present invention can be variously modified without departing from the gist of the present invention.

1: base sheet roll, 10: polyester nonwoven fabric, 11: anticorrosion sheet

Claims (5)

1. It comprises a polyester nonwoven fabric and a petrolatum anticorrosive, the petrolatum anticorrosive is impregnated in the polyester nonwoven fabric,
   The average fineness of the fibers constituting the polyester nonwoven fabric is 12 to 50 dTex,
   An anticorrosion sheet, wherein the basis weight of the polyester nonwoven fabric is 150 to 500 g / m ² .
2. The anticorrosion sheet according to claim 1, wherein the average fineness is 15 dTex or more.
3. A method for producing an anticorrosion sheet comprising a polyester non-woven fabric and a petrolatum anticorrosive, and producing an anticorrosive sheet in which the petrolatum anticorrosive is impregnated in the polyester non-woven fabric,
   A compression step of heating the polyester nonwoven fabric and compressing in the thickness direction;
   An impregnation step of impregnating the polyester nonwoven fabric compressed in the compression step with a petrolatum-based anticorrosive agent that has been heated and has a lower viscosity than normal temperature,
   The average fineness of the fibers constituting the polyester nonwoven fabric is 12 to 50 dTex,
   A method for producing an anticorrosion sheet, wherein the basis weight of the polyester nonwoven fabric is 150 to 500 g / m ² .
4. The method for producing an anticorrosion sheet according to claim 3, wherein the anticorrosion sheet has an average thickness of 2 mm or more.
5. The method for producing an anticorrosion sheet according to claim 3 or 4, wherein the average fineness is 15 dTex or more.

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