JP2017101367A - Substrate sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a substrate sheet having corrosion resistant paste carried relatively uniformly while forming the sheet with thin thickness.SOLUTION: There is provided a substrate sheet 11 which is arranged between a protection object protected by a corrosion prevention sheet 11 and the corrosion prevention sheet 11 and is used for adhesion between a corrosion prevention sheet 11 and the protection object and has a corrosion prevention paste containing polyester unwoven fabric 10 and petrolatum-based corrosion preventive agent, wherein the corrosive prevention paste is impregnated into the polyester unwoven fabric 10 in a past tank 2, average fineness of a fiber constituting the polyester unwoven fabric 10 is 0.8 to 6.0 dTex and basis weight of the polyester unwoven fabric 10 is 10 to 200 g/m.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a base sheet disposed between a protection object to be protected by a corrosion protection sheet and the corrosion protection sheet.

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. As an anticorrosion tape used for this type of application, a tape-like base material sheet made of a nonwoven fabric is impregnated with and supported by an anticorrosion paste mainly composed of petrolatum or the like. (See Patent Document 1 below).
In addition, since petrolatum-based anticorrosive paste may drop in a high temperature range that can be reached outdoors in summer, the anticorrosive paste containing dry oil or semi-dry oil is also used as an anticorrosive sheet. .

In addition, the conventional anticorrosion sheet is not in a particularly excellent state of surface adhesiveness for facilitating its handling.
And the protection target objects, such as a pipe material protected by such an anticorrosion sheet, are not necessarily flat on the surface, and may be uneven and have a portion recessed from the surroundings.
If it does so, there exists a possibility of producing a float in a corrosion prevention sheet in a recessed part only by affixing a corrosion prevention sheet directly on a protection target object.
Therefore, conventionally, only the anticorrosive paste is applied to the surface of the object to be protected in advance to adjust the unevenness, and the adhesion between the anticorrosion sheet and the object to be protected is improved as a base treatment. Yes.

In addition, the following Patent Document 2 describes forming a two-layer anticorrosion structure of a lower tape and an upper tape, and the porous tape is impregnated with a viscous anticorrosive compound in the lower tape. It is described that it is always soft.
That is, Patent Document 2 below describes that the lower tape is used as a base sheet for improving the adhesion between the upper tape and the object to be protected.

Japanese Patent Laid-Open No. 06-184968 JP 10-044320 A

By the way, the anticorrosion sheet requires a certain thickness from the viewpoint of imparting anticorrosion to the object to be protected, but for the base sheet, unlike the anticorrosion sheet, the followability to the surface shape of the object to be protected It is more important than thickness to have excellent adhesion to anticorrosion sheets.
In addition, from the viewpoint of suppressing the material cost per unit area of the base sheet, using a base sheet with a small basis weight, the amount of the base sheet is suppressed, and the anticorrosive paste attached to the base sheet is used. It is desirable to reduce the amount used.
However, when a base sheet is produced using a base sheet with a low basis weight from the viewpoint of followability to the protection target and cost, the anticorrosion paste is difficult to be uniformly supported on the base sheet, and the protection target and the anticorrosion sheet There is a problem that non-uniformity occurs in the adhesiveness.

  In view of the above problems, an object of the present invention is to provide a base sheet on which an anticorrosion paste is relatively uniformly supported while being formed thin.

As a result of intensive studies by the present inventor, an anticorrosive paste is obtained even when a base sheet having an average fineness of fibers of 6.0 dTex or less is used and a basis weight of 200 g / m ² or less is used as the base sheet. It has been found that it is supported relatively uniformly, and the present invention has been completed.

That is, the present invention is disposed between the protection object to be protected by the corrosion protection sheet and the protection sheet, and is used for adhesion between the protection sheet and the protection object, and includes a polyester nonwoven fabric and an anticorrosion paste, The anticorrosive paste is impregnated in the polyester nonwoven fabric, the average fineness of the fibers constituting the polyester nonwoven fabric is 0.8 to 6.0 dTex, and the basis weight of the polyester nonwoven fabric is 10 to 200 g / m ² . A base sheet is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the base sheet by which anticorrosion paste was carry | supported comparatively uniformly can be provided, forming thinly.

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

Hereinafter, a preferred embodiment of the present invention will be described with an example.
The base sheet in the present embodiment includes a polyester non-woven fabric (hereinafter also simply referred to as “non-woven fabric”) as a long belt-like base sheet, and an anticorrosive paste impregnated in the polyester non-woven fabric.

As the polyester nonwoven fabric used as the base sheet of the base sheet of the present embodiment, the base sheet having a smaller basis weight is excellent in followability to the surface shape of the protection target and forms a base sheet excellent in adhesion to the protection target. This is advantageous.
On the other hand, it is advantageous to employ a nonwoven fabric having a basis weight of a certain level or more as a base sheet in order to exhibit excellent strength in the base sheet.
Therefore, the basis weight of the non-woven fabric can usually be 10 to 200 g / m ² in that it can impart excellent strength and excellent adhesion to the object to be protected to the base sheet.
Further, the base sheet, from the viewpoint of retention of the corrosion paste, basis weight of preferably 25 to 150 g / ^{m 2,} more preferably be a non-woven fabric of 50 to 100 g / ^{m 2.}

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 anti-corrosion paste can be satisfactorily impregnated and supported, and the fibers are sufficiently entangled in the thickness direction. Those are preferred.
In addition, the fibers constituting the nonwoven fabric have a cross-sectional shape that extends radially from the center of a circular shape, a Y shape, an X shape, or a star shape in that the impregnation and support of the anticorrosion paste can be made favorable. What has a shape is employ | adopted.

As said nonwoven fabric, what was produced by various methods, such as a spun bond, a chemical bond, a needle punch, a stitch bond, is employable.
Among them, a stitch bond nonwoven fabric formed by sewing the web so that the seam direction is the longitudinal direction of the base sheet is preferable in that the strength in the longitudinal direction of the base sheet can be improved.
That is, it can be said that the stitch-bonded nonwoven fabric is suitable as the base material sheet of the present embodiment in that a reinforcing effect by the stitch yarn can be expected even if the web is thin.

When the nonwoven fabric has the same basis weight, the fiber becomes rough when the fiber thickness is increased.
Accordingly, the average fineness of the fibers is 0.8 to 6.0 dTex in order to prevent partial removal of the anticorrosion paste and partial exposure of the fibers to uniformly carry the anticorrosion paste in the surface direction. Importantly, the average fineness of the fiber is preferably 1.0 to 5.0 dTex, more preferably 1.2 to 3.3 dTex, from the viewpoint of uniformity of the texture.
About the said average fineness, it can measure by B method (simple method) of JISL1013: 2010.

The anticorrosion paste carried on the base sheet may be the same as a general petrolatum anticorrosion paste, and includes oil components, fillers, and rust preventives as defined in JIS K2235. What uses No. as a main component of an oil-based component is employable.
Further, the anticorrosion paste may be a petrolatum anticorrosive containing an oily component prepared in the same texture as petrolatum with petroleum wax or oil other than petrolatum together with a filler or a rust inhibitor.

The anticorrosion paste preferably has a consistency at 70C of 70 to 130.
The consistency in this embodiment can be measured according to JIS K2235: 1991 “Petroleum wax 5.10 consistency test method”.

The anticorrosion paste has a yield value at 23 ° C. by a parallel plate viscometer of preferably 1 to 30000 Pa, more preferably 5 to 20000 Pa, and even more preferably 10 to 15000 Pa.
In addition, the yield value by the parallel plate viscometer in this embodiment can be measured according to "Method by spread meter" of JIS K5701-1: 2000 "Lithographic ink-Part 1: Test method". The weight of the load plate is 5 kg, and the time from “when the load plate contacts the sample” to “when the diameter of the spread is measured” is 60 seconds.

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-based anticorrosive used as the anticorrosive paste of this embodiment contains the oil component, that is, the oil and the wax.
Furthermore, the petrolatum anticorrosive agent of this embodiment contains additives, such as a rust inhibitor and an inorganic filler.

  The oil component is preferably contained in the petrolatum anticorrosive agent in a proportion of 20% by mass to 70% by mass, and more preferably in a proportion of 40% by mass to 60% 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.

As the hydrocarbon wax, for example, paraffin wax defined by 120P, 125P, 130P, 135P, 140P, 145P, 150P, and 155P in JIS K2235, 150M, 160M, 170M, Microcrystalline wax defined by the types of 180M and 190M can be employed.
In addition, as the hydrocarbon-based wax, those outside the same standard can be adopted, 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-based anticorrosive agent, it is preferable to include a hydrocarbon-based wax having a melting point equal to or higher than a temperature assumed in actual use of the base sheet.
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 use 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 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 adopted.

Examples of the rust preventive include sulfonate, lanolin derivative, petroleum oxide, ester, amide compound, phosphate ester, benzotriazole and the like.
Examples of the petroleum oxide include petrolatum oxide and paraffin oxide.

  Examples of the inorganic filler include calcium carbonate, clay, talc, silica, and alumina.

  In addition, the petrolatum anticorrosive agent can contain, for example, functional agents such as antifungal agents and antibacterial agents; pigments and the like as additives.

In the base sheet according to the present embodiment, the adhesion amount per unit area of the petrolatum anticorrosive agent to the base sheet is preferably 0.2 to 2.0 kg / m ² , more preferably 0.4 to 1.5 kg. / M ² .

  The base sheet according to the present embodiment has a thickness of preferably 0.3 to 2.0 mm, more preferably 0.5 to 1.5 mm.

Next, the manufacturing method of the base sheet which concerns on this embodiment is demonstrated.
The manufacturing method of the base sheet which concerns on this embodiment is a method of producing a base sheet provided with a nonwoven fabric and the petrolatum anticorrosive carry | supported by this nonwoven fabric.
In addition, the method for producing a base sheet according to the present embodiment includes a compression step of heating a polyester nonwoven fabric in a thickness direction and a petrolatum anticorrosive that is heated and has a lower viscosity than that at room temperature, And an impregnation step of impregnating the nonwoven fabric.

In the following, while using the polyester nonwoven fabric that is stitch bonded to the base sheet, the base sheet is suppressed from being exposed on the surface, and the base sheet on which the anticorrosive paste made of the petrolatum anticorrosive is supported relatively uniformly. A manufacturing method for manufacturing the above will be described as an example.
The base sheet manufacturing method of the present embodiment is to produce a long strip-shaped original fabric sheet and slit it into an appropriate width as it is or to make a base sheet.
First, an apparatus configuration suitable for manufacturing the base sheet (raw fabric sheet) will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a manufacturing facility for manufacturing the base sheet of the present embodiment. As shown in the figure, the manufacturing method includes a length in which a seam extends in the longitudinal direction. A base sheet roll 1 in which a strip-shaped polyester nonwoven fabric is rolled is used.
In addition, in the production facility for producing the base sheet of this 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 this embodiment, the base sheet roll 1 is rotatably held, and the polyester nonwoven fabric 10 that is rotated from the outer side of the base sheet roll 1 is directed toward the paste tank 2. A delivery machine 3 to be sent out is provided.

  In the manufacturing facility of the present embodiment, a petrolatum-based anticorrosive agent is placed in the paste tank 2 on the polyester nonwoven fabric 10 which is disposed on the opposite side of the transmitter 3 with the paste tank 2 interposed therebetween. There is further provided a winder 4 that takes up the base sheet 11 obtained by the impregnation and winds it into a roll.

Furthermore, the manufacturing facility of the present embodiment includes a pair of heating rolls 51. The polyester nonwoven fabric 10 sent out from the feeder 3 before the paste tank 2 is sandwiched between the heating rolls 51, and the polyester nonwoven fabric 10 There is provided a hot set machine 5 that compresses the material by heating in the thickness direction.
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 substrate to form a base sheet 11 having a predetermined thickness.

  In the manufacturing facility of the present embodiment, a cooling machine 7 for forcibly cooling the base 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 base sheet of the present embodiment, the polyester nonwoven fabric 10 fed out from the feeder 3 on which the base sheet roll 1 is mounted becomes the base sheet 11 and is wound by the winder 4. The vehicle is 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 impregnated with the petrolatum anticorrosive agent while passing through the agent, and the impregnated sheet 10 ′ having passed through the paste tank 2 is adjusted by the thickness controller 6 to adjust the amount of the petrolatum anticorrosive agent supported. The base sheet 11 is configured to be cooled by the cooler 7 and wound by the winder 4.

  As the delivery device 3, for example, one that can send out the polyester nonwoven fabric 10 at a constant speed while applying an appropriate brake can be adopted.

The hot set machine 5 that compresses the polyester nonwoven fabric 10 delivered from the delivery machine 3 is provided 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 a base 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 need not 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.

  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. For example, a first thickness for scraping off the petrolatum anticorrosive that is brought into contact with one surface of the impregnated sheet 10 ′ and excessively adhered to the surface of the one surface. A regulating member 61 and a first surface for scraping off the petrolatum-based anticorrosive agent which is brought into contact with the impregnated sheet 10 'from the other side opposite to the one side and is excessively adhered to the surface on the other side. What has the 2nd thickness control member 62 is employable.

In addition, as the 1st thickness control member 61 or the 2nd thickness control member 62, the plate-shaped thing and roll-shaped thing pulled up from the said paste tank 2 and longer than the width | variety of the said polyester nonwoven fabric 10 are used. Can be adopted.
The thickness regulating members 61 and 62 make the petrolatum anticorrosive agent on the surface of the impregnated sheet smoother and more uniform 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 make it into 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. The side where two stitches are observed is in a tight state with fewer voids 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 ′.
Accordingly, the thickness controller 6 controls the timing at which the amount of the petrolatum anticorrosive agent carried on the polyester nonwoven fabric 10 is regulated by the first thickness regulating member 61 on the one surface side 10a, and the second thickness on the other surface side 10b. It is preferable to set separately the timing at which the amount of the petrolatum-based anticorrosive agent carried by the regulating member 62 is regulated, and it is preferable that the thickness regulating members 61 and 62 be offset from the traveling direction of the impregnated sheet 10 ′. .

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

  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 (displacement) in the vertical direction, but also the side edges of the first roll 61 and the second roll 62 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 first roll side of the second roll 62 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.

  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 base 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 excess petrolatum-based anticorrosive adhering to the one surface side 10a ′ of the impregnated sheet 10 ′, but the polyester nonwoven fabric 10 is on the side of two stitches. Since the one-surface side 10a is in a tighter state, the thread is easily exposed, and is rotated so as not to expose the surface of the thread more reliably, 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 thus it is more certain that the yarn is exposed on the surface of the base sheet. 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 are cooled by the contact with the impregnated sheet 10 ′ to a temperature below the crystallization temperature of the wax, which is the main component, of the petrolatum anticorrosive agent supported on the impregnated sheet 10 ′. If it is allowed to occur, the viscosity of the petrolatum anticorrosive rapidly increases and the petrolatum anticorrosive may be peeled off from the polyester nonwoven fabric 10. Therefore, the surface temperature is set to a temperature exceeding the crystallization temperature, and the thickness is controlled. It is preferable to have a heating function so that the petrolatum anticorrosive is maintained at a temperature exceeding the crystallization temperature until it passes through the machine 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 therein can be adopted.

  And the said cooler 7 for forcedly cooling the base sheet which passed this thickness control machine 6 makes the gas of the temperature lower than the crystallization temperature of the wax of the said petrolatum anticorrosive agent the petrolatum anticorrosive of the said base sheet Or a cooling roller that is brought into contact with the base sheet and moves along with the movement of the base sheet.

It is preferable that the cooler 7 is configured to blow a gas having a temperature lower than the crystallization temperature of the petrolatum anticorrosive wax onto the petrolatum anticorrosive of the base sheet. Since the cooler 7 has such a configuration, it can cool a relatively wide range of the surface of the base sheet.
As the gas, it is preferable to use a gas containing moisture. By using a gas containing moisture, the base 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 water-containing gas is blown onto the base sheet, water particles may collide with the uncured petrolatum anticorrosive agent, resulting in dents on the surface of the base sheet, but the smaller the water particle size, the larger the size of the dents. It is because it can be made small.
The particle size of the water particles is preferably 50 μm or less, more preferably 1 to 20 μm.

  Furthermore, the said winder 4 is not specifically limited, The thing comprised so that the said base sheet may be taken up at a fixed speed and wound up in roll shape can be employ | adopted.

Next, a manufacturing method for manufacturing a base sheet using such a manufacturing facility will be described.
First, the base sheet roll 1 is set in the delivery machine 3, 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 set 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 average fineness is 1.2 to 3.3 dTex, the basis weight is 50 to 70 g / m ² , and the compression step is performed on a polyester nonwoven fabric having a thickness of 0.4 to 1.0 mm. Usually, the compression process can be carried out by setting the temperature of the heating roll to 170 ° C. to 180 ° C., and setting the total time for the polyester nonwoven fabric 10 to contact the heating roll to 10 seconds 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 0.50. 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, as in the polyester nonwoven fabric of the present embodiment, the shrinkage force is small when the basis weight is smaller than that used for the base sheet in the conventional base sheet, but the compression Shrinkage can be further suppressed by performing the process.

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.
Moreover, since the compression process causes the fibers to become dense and the polyester nonwoven fabric is tightened, the base sheet can be made excellent in tensile strength. For example, a high tension is applied to the base sheet during construction. Even when the is added, it is possible to prevent the base sheet from being cut carelessly.

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.
When the polyester nonwoven fabric is impregnated with the petrolatum anticorrosive, the temperature of the petrolatum anticorrosive in the paste tank is set to 90 ° C. to 100 ° C., and the petrolatum anticorrosive is sufficiently reduced in viscosity as compared with the normal temperature state. It is preferable.

And when the said polyester nonwoven fabric is immersed in the petrolatum anticorrosive of 90 degreeC-100 degreeC, the polyester nonwoven fabric made into the compression state in the said compression process is the pressure which a petrolatum anticorrosive tries to infiltrate inside by a capillary phenomenon And the thickness is restored by heating with a petrolatum anticorrosive.
At this time, in the present embodiment, the base sheet is thin and has a small basis weight, so that not only can the petrolatum anticorrosive be impregnated quickly, but also the function of sucking the petrolatum anticorrosive into the interior as the thickness is restored. Thus, it is possible to suppress bubbles from remaining in the polyester nonwoven fabric after the impregnation step.

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 ′. It is possible to form a base sheet in which the anticorrosive agent is scraped off using the outer peripheral surfaces of the rolls 61 and 62 and adjusted to a predetermined thickness.
Since the first roll 61 and the second roll 62 are arranged in the thickness controller 6 in the state of being offset up and down as described above, the base sheet is the other side of the impregnated sheet 10 ′ first. After the loading amount of the petrolatum anticorrosive agent on the side 10b ′ is adjusted by the second roll 62, the loading amount of the petrolatum anticorrosive agent on the one surface side 10a ′ opposite to the other surface side 10b ′ is the first roll 61. And the adjusting material 63.

Conventional thickness control machines are generally configured using two long blades, and the blades are arranged so that the blade edges face each other, and the finished thickness of the base sheet produced between the blade edges is as follows. It arrange | positions so that it may become, and it is comprised so that an impregnated sheet | seat may pass between these.
Therefore, the base sheet obtained by passing through a conventional thickness controller has a uniform thickness and excellent surface smoothness.
On the other hand, the conventional base 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.

  Note that the amount of the petrolatum anticorrosive supported on each surface of the base sheet depends on the tension of the impregnated sheet 10 ′ in the thickness controller (the pressing force on 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.

Thereafter, the base sheet may be wound as it is with the winder 4, or may be wound with a separate film interposed therebetween.
The wound base sheet can be used as a base sheet as it is or after being slit to an appropriate width.

When the base sheet is subjected to the base treatment on the protection target object to be protected by the anticorrosion sheet such as the pipe material to form the anticorrosion structure, the base sheet is first wound around the pipe material to form the base layer. After that, the anticorrosion tape may be wound to form an anticorrosion tape layer outside the underlayer.
The base sheet of this embodiment has a small basis weight of the base sheet and a thin thickness, so that it can be freely deformed and has excellent followability with respect to the outer surface of the pipe material even if there are some irregularities in the pipe material. It can be demonstrated.
Moreover, since the base sheet of the present embodiment has the anticorrosion paste uniformly supported on the base sheet, adhesion unevenness is suppressed, and the base sheet is disposed between the tube material and the anticorrosion sheet as the protection target. Excellent adhesion is exhibited over the entire surface of both the anticorrosion sheet and the object to be protected.
And pipes installed in the sea are easily washed away by waves even if they are coated with anti-corrosion paste. Although it was difficult to form a structure, the base sheet of the present embodiment can be applied to a pipe or the like without a gap, and after being applied, the anticorrosion paste alone is applied. It is particularly effective for the base treatment when forming the anticorrosion structure in such a place.

  In addition, about the base sheet of this invention, it is not limited to the thing of the above illustrations, About the manufacturing method, it is not limited to the above illustration at all.

  EXAMPLES Next, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these.

(Evaluation)
The example which performed various evaluation about the base sheet is shown.
First, an evaluation method for the base sheet will be described.

<Thickness of polyester nonwoven fabric>
About the thickness of the polyester nonwoven fabric, the thickness of five places of the polyester nonwoven fabric was measured using the 1 / 100-mm dial gauge of measuring element 10mmphi, and the arithmetic mean value of the measured value was made into the thickness of a polyester nonwoven fabric.

<Average fineness of polyester nonwoven fabric>
It measured by B method (simple method) of JIS L1013: 2010.

<Amount of anti-corrosion paste>
The basis weight of the polyester nonwoven fabric before impregnation with the anticorrosive paste was determined from the weight and area. Further, the basis weight of the base sheet obtained by impregnating the polyester nonwoven fabric with the anticorrosive paste was determined from the weight and area. And the adhesion amount of the anticorrosive paste was calculated | required from the difference of the fabric weight of a base sheet, and the fabric weight of a polyester nonwoven fabric.

<Anti-corrosion paste adhesion>
The state of adhesion of the anticorrosive paste to the polyester nonwoven fabric was confirmed visually.
○: Little or no thread is exposed △: The thread is slightly exposed ×: Cases other than ○ and △

Example 1
The base sheet was produced on the following conditions using the manufacturing equipment for manufacturing the base sheet shown in FIG. 1 described above. In addition, as the anticorrosive paste, a petrolatum-based anticorrosive paste was used.
Base sheet: Polyester non-woven fabric Thickness: 0.7mm
Weight per unit: 60 g / m ²
Average fineness of fiber: 2.2 dTex
Fiber length: 51mm
Fiber cross-sectional shape: Y-shaped Gap between heating rolls: 0.9 mm
Gap between rolls of thickness controller: 1.4 mm

(Example 2)
A base sheet was produced in the same manner as in Example 1 except that the gap between the rolls of the thickness controller was 0.8 mm.

(Example 3)
A base sheet was produced in the same manner as in Example 1 except for the following conditions.
Base sheet: Polyester non-woven fabric Thickness: 0.6mm
Per unit weight: 56 g / m ²
Average fineness of fiber: 1.7 dTex
Fiber length: 38mm
Fiber cross-sectional shape: Circular shape Gap between rolls of thickness controller: 1.2 mm

Example 4
A base sheet was produced in the same manner as in Example 3 except that the gap between the heating rolls was 0.4 mm and the gap between the rolls of the thickness controller was 1.4 mm.

(Example 5)
A base sheet was produced in the same manner as in Example 4 except that the gap between the rolls of the thickness controller was 0.6 mm.

(Example 6)
A base sheet was produced in the same manner as in Example 1 except for the following conditions.
Base sheet: Polyester non-woven fabric Thickness: 1.2mm
Per unit weight: 97 g / m ²
Average fineness of fiber: 3.3 dTex
Fiber length: 51mm
Fiber cross-sectional shape: circular shape, gap between heating rolls: 1.2 mm

(Reference Example 1)
A base sheet was produced in the same manner as in Example 1 except that the gap between the rolls of the thickness controller was 0.6 mm.

(Reference Example 2)
A base sheet was produced in the same manner as in Example 3 except that the gap between rolls of the thickness controller was 0.8 mm.

(Reference Example 3)
A base sheet was produced in the same manner as in Example 3 except that the gap between rolls of the thickness controller was 0.6 mm.

(Reference Example 4)
A base sheet was produced in the same manner as in Example 6 except for the following conditions.
Base sheet: Polyester non-woven fabric Thickness: 0.9mm
Per unit weight: 84 g / m ²
Gap between heating rolls: 0.9 mm
Gap between rolls of thickness controller: 0.6 mm

  The results are shown in Table 1.

As shown in Table 1, the base sheets of Examples 1 to 6 within the scope of the present invention had little or no thread stitches exposed. In Reference Examples 1 to 4, exposure of the stitches was observed as compared with the base sheets of Examples 1 to 6.
Therefore, according to the present invention, it can be seen that it is possible to provide a base sheet on which the anticorrosion paste is supported relatively uniformly while being formed thin.

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

Claims (2)

It is disposed between the protection object to be protected by the corrosion protection sheet and the protection sheet, and is used for bonding the protection sheet and the protection object,
A polyester nonwoven fabric and an anticorrosive paste, the anticorrosive paste is impregnated in the polyester nonwoven fabric,
The average fineness of the fibers constituting the polyester nonwoven fabric is 0.8 to 6.0 dTex,
The basis sheet of this polyester nonwoven fabric is 10-200 g / m < ² >, The base sheet characterized by the above-mentioned.   The base sheet according to claim 1, wherein a cross-sectional shape of the fiber is circular.

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