JPH11257583A - Sheathing cover member and sheathing work execution method using the cover member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the moisture absorption to a heat-insulative heat-reserving material and to facilitate the work ability winding of a sheathing cover member about a sheathing part of the heat-insulative heat-reserving material. SOLUTION: This sheathing cover member 3 for outer packing is a metal foil a nickel plating is applied on both surfaces, whose spring-back return parameter is less than 10. In executing the sheathing work of a heat-reserving material 2, a duslicated nickel-slaled metal foil is wound about the heat-reserving material 2, and a two-sided tape 4 is stuck to the terminal of the metal foil, so as to contact two metal foils closely each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to heat insulation on the front side and outer periphery of pipes for transporting gases and liquids such as water, steam, heat medium, petroleum, tanks for storing them, and chemical reaction facilities. The present invention relates to a cover member used for construction.

[0002]

2. Description of the Related Art Conventionally, a layered product of mineral fibers such as rock wool and glass wool is often used as a heat insulating material, but these materials have extremely high water penetration and water absorption. In addition, a polymer foam molded article widely used as a heat insulating material still has a hygroscopic property. If the heat insulating material is immersed or absorbed, it becomes a disadvantage that it is difficult to maintain the heat insulating effect. Therefore, it has been conventionally performed to completely cover the surface of the heat insulating material layer air-tightly with a material having waterproof / moisture proof performance.
Alternatively, a water-resistant coating has been formed on the surface layer by means of applying or spraying a film-forming substance of asphalt or a polymer to prevent attenuation of the heat insulating function due to moisture absorption of the heat insulating material. In other words, in pipes for transporting water, steam, heat medium, petroleum gas or liquid, or their storage tanks, chemical reaction facilities, etc., the handling of transported goods is smoothed and the internal stored matter is prevented from being denatured. It is customary to attach a heat insulating material to a pipe or a storage facility for the purpose. As these heat insulating and heat insulating materials, synthetic resin foams or mineral fiber or ceramic moldings such as rock wool and glass wool are preferably used. Further, in order to maintain the performance of these heat insulating and heat insulating materials for a long period of time, a moisture proof and waterproof material is adhered to the surface thereof to protect the heat insulating and heat insulating material layer from the outside temperature and the outside humidity. Since the heat insulating material is a porous material with a large porosity for its purpose, it is particularly susceptible to the influence of external humidity.If the heat insulating material is left exposed, the heat insulating material absorbs moisture and the original performance is improved. This is because they are often lost.

[0003]

Particularly, in the former mineral fiber heat insulating material, the formation of a water-resistant coating on the surface layer is regarded as an essential technical requirement, and an iron plate or aluminum sheet is used as an exterior material from above the surface layer. And a stainless steel plate. In this case, since they are joined by a sheet metal working method such as "goby set / crimping", a gap is formed between the exterior sheet seals, so that a nectar seal cannot be formed. For this reason, it is poor in water stoppage and moisture proofness, and causes flooding from the exterior plate. However, even if it is in a flooded state, it is not possible to judge the quality of the heat insulating effect by visual inspection, which is extremely inconvenient in terms of heat management, and there is a problem that the economic loss due to heat loss increases. In addition, the work of laying waterproof and moisture-proof materials,
There is a problem that labor-intensive construction is required, for example, the work of the sheet metal work of the hammer group before mounting the exterior plate requires a highly skilled worker. Conventionally, as a method of protecting these heat insulating and heat insulating materials from the outside humidity, the surface of the heat insulating and heat insulating material layer is completely airtightly covered with a material having a further waterproof and moisture proof performance, such as an iron plate, or asphalt or a polymer-based material. It has been practiced to apply or spray a film-forming substance on the surface layer of the heat insulating material to form a water-resistant coating on the surface layer, thereby preventing the heat insulating material from deteriorating in performance due to moisture absorption. However, using iron plate as a heat insulating material to complete the confidential complete cover requires a large amount of work,
When using an iron plate, an aluminum plate, a stainless steel plate, etc. as an exterior material from above when using mineral fiber materials, because they are joined by a sheet metal working method such as so-called `` goby set, caulking, bending '', There is a problem that a gap is easily formed between the overlapping portions, and it is difficult to complete the sealing.

Further, when a conventional iron plate, for example, a tin plate, is used, since the tin plate has a considerable thickness and the bending strength of the tin plate is high, it is necessary to use an exterior plate at an insulation and heat-insulating construction site. It has also been pointed out that if the processing of the material is difficult and a dimensional deviation occurs at the place where the work is performed, a new adjustment work is required. As a proposal to prevent the problem of moisture absorption even if such a dimensional deviation occurs, for example, by using a polyethylene foam with low hygroscopicity as an insulating heat insulating material, or by using a rubber adhesive material having good adhesiveness Proposal to prevent intrusion of external moisture (Japanese Patent Laid-Open No. 2-7229)
No. 6), a proposal to stop moisture absorption within a certain limit by using a composite sheet having a self-breathing property (Japanese Patent Application Laid-Open No. 63-275783), or to use a so-called hot melt resin in an insulating heat insulating material. There is a proposal (Japanese Patent Publication No. 52-39707) to prevent the infiltration of moisture into the heat insulating material by injecting.

At present, in order to solve the above-mentioned problems, a standardized product in which “goby set” sheet metal is machined at the end of the exterior metal plate is adopted, and the work process is being rationalized. However, there is still a problem that the sourcing management of the members is complicated, so-called "setup mistake" is liable to occur, and it is a factor of causing a disadvantage in cost.

[0006]

In view of this, the present inventors have conducted detailed studies on this point, and as a result, have found that a metal foil having excellent surface smoothness obtained by controlling plating conditions has been plated. By wrapping around the heat insulating material, it was possible to solve the above-mentioned problems that had been pointed out previously, and to find that the workability of winding the heat insulating material exterior part was dramatically improved than before, and to the present invention. Reached. That is, the exterior cover member of the present invention is a metal foil plated on both sides with a metal, and has a springback return parameter of 10 or less. In addition, the method of exterior coating of a heat insulating material of the present invention is to wind and heat a metal foil plated with nickel on both sides around the heat insulating material, adhere a double-sided tape to an end of the metal foil, and adhere the metal foils to each other. Features.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a construction method in which a conventional exterior material is mounted by a "goby set" sheet metal work, various types of leakage and dew condensation of heat insulating material due to infiltration / moisture permeation generated from a lap interface at an end portion and a gap at a joint portion. The phenomenon promotes embrittlement of the heat insulating material, lowers the heat insulating function, and significantly impairs and attenuates the construction effect. Therefore, the work process of wrapping the waterproof / moisture-proof material is an unavoidable important process that governs the purpose and effect of the heat-cutting work. 3. The double-sided adhesive tape according to claim 2, wherein the metal foil according to claim 1 is directly applied to the outer peripheral portion of the heat insulating material.
This is a construction means for performing air-tight and water-honey sealing only in a single step of the bonding and joining means by means of a tape and shutting off the water-containing and moisture absorption of the heat insulating material layer. The present invention relates to a gas-phase body which is required to maintain a constant temperature (low temperature / high temperature) or pipings for transporting a liquid material, a tank for storing the same, and various types of chemical reaction-related equipment, devices, and the like. It is related to the exterior plate members to be installed to protect the installed various heat-insulating materials from the external atmosphere and to make their functional effects durable, and to the installation method. , Storage equipment,
It is applied to a wide range of construction such as thermal power generation, natural gas-related piping and thermal storage work, such as thermal insulation work for industrial buildings and production factories, and is carried out in a wide variety of constructions such as cold insulation work. It is implemented in the form of a combination of a metal foil exterior material described in claim 1 and a double-sided tape-based construction method described in claim 2 in which the metal foil exterior material is mounted in the field of so-called thermal protection construction and thermal cutting construction. is there. That is, after the heat insulation and heat insulation work is completed, the heat insulation and heat insulation material is easily wound by continuously winding the heat insulation and heat insulating material exterior using a band-shaped metal foil and applying a double-sided tape to a certain area of the final terminal portion. A seal that does not allow water to enter inside can be formed, and the construction operation is completed. Hereinafter, the content of the present invention will be described in detail for each item. 1. Properties of Metal Foil The cover member wound around the heat insulating and heat insulating material exterior part used in the present invention is a metal foil. As the material of the metal foil, iron, aluminum or other metal plates can be used, but the most preferable is a metal foil plated with nickel. This is because a single metal plate is easily corroded, and once a corroded state occurs, the adhesion deteriorates. As the material of the metal foil, a cold-rolled low-carbon Al guild steel, an ultra-low carbon steel having a carbon content of 0.003% or less, a non-aging ultra-low carbon steel to which niobium, boron, and titanium are added, and stainless steel can be used. . The thickness of the metal foil is preferably 0.01 mm to 0.5 mm. 0.
If the thickness is more than 5mm, the repulsion strength of the metal foil becomes strong, so it is difficult to wind and finish the metal foil, and the metal foil cannot be easily bent by hand. This is because the on-site winding work becomes difficult. On the other hand, if the thickness is less than 0.01 mm, the strength is too weak to be easily broken, which is inappropriate. Furthermore, the springback parameter (SBP) of this metal foil
Must be less than or equal to 10. This is because, as the springback parameter (SBP) becomes higher, the repulsive force of the metal foil becomes stronger as in the case where the thickness becomes thicker, and it becomes difficult to process the terminal end. Note that the springback parameter (SBP) also depends on plating conditions and the like.

[0008] 2. Plating Treatment It is preferable to perform metal plating on the metal foil, and it is preferable that the metal plating is metal plating on both sides. For example, when nickel plating is performed as the metal plating, the nickel plating is relatively soft, so that the metal foil is not hardened by the plating process. This is for improving the adhesiveness when winding on the layer. Further, unlike other coating agents, nickel plating does not easily peel off, so it has corrosion resistance and is suitable as an exterior material. The plating adhesion amount is preferably 5 to ²⁰ g / m ² . This is because nickel plating is present for maintaining corrosion resistance and is economically disadvantageous with an adhesion amount of 20 g / m ² or more.

The metal foil is pickled before plating.
The surface condition is improved by performing degreasing with an organic solvent, alkali cleaning treatment, or the like. As the plating bath, for example, a nickel plating bath includes a Watt bath, a sulfamic acid bath, a borofluoride bath, a chloride bath, and the like, but any bath may be used. As the composition, for example, the following bath compositions can be used, but the present invention is not limited to these bath compositions, and any bath composition having a formulation known in the art can be used. A brightener may be mixed in the plating bath. The plating conditions are those of the electrolytic plating method in which the pH is preferably in an acidic range of 3.5 to 5.5, and the bath temperature is 40 to 60 ° C., but a lower temperature is more preferable. The current density is suitably in the range of 3 to 80 A / dm ² , but in order to secure the surface smoothness of the plating surface and improve the adhesion, it is preferable to carry out the current density as low as possible. Various functions of the metal foil described in claim 1 as an exterior material according to the present invention, and the basic performance of the mounting method using a double-sided tape described in claim 2 are as follows. (For example, cold-rolled low-carbon Al-killed steel) Although it is governed by its properties, a synthetic resin film is laminated and pressed on both sides or one side of a metal foil for the purpose of protecting its characteristic value and strengthening its function. It can be formed. In the present invention, when laminating and laminating a synthetic resin film, in order to satisfy the required functional requirements, in the case of providing an outer covering of piping in an indoor part, a polyethylene terephthalate resin is used as a surface film of the laminate layer. It is desirable to choose. Severe outdoor conditions (rainfall, sunshine, salinity, etc.)
As the surface layer resin of the exterior cover to be used for the construction of the part exposed to the water, a non-stretched polyethylene film is suitable. The polyethylene resin film forming the surface layer of the exterior (outdoor) cover according to the present invention is formed by adding Si to the ethylene chain of polyethylene.
Can also be used by graft-crosslinking. A side chain that causes cross-linking is added to the ethylene chain of polyethylene in advance at the stage of the material, and the mixture is co-existed with a cross-linking promoting catalyst and formed into a sheet. By using a polyethylene resin film in which the cross-linking reaction is completed, the corrosion resistance and weather resistance are remarkably enhanced, and an effective addition is made to prevent physical damage to the surface.

[0010] 3. Winding work Since the metal foil of the present invention is extremely thin, when the metal foil is wound, the heat insulating material mounted on the transport pipe and the metal foil easily adhere to each other as if they had a single material characteristic. In the winding operation, a double-sided adhesive tape is stuck on the metal foil at the terminal end, and the opposite end face is stuck on the sticking surface to bond. Alternatively, a method of closing both ends with a single-sided tape may be used. Since the plating surface of the metal foil of the present invention is extremely excellent in surface smoothness, the adhesion at the overlapping portion of the metal foil is extremely good, and it is possible to form a dense state that does not easily allow water to enter. it can.

Accordingly, the terminal processing is easily completed by inserting the double-sided pressure-sensitive adhesive tape between the first and second peripheral portions of the final terminal and press-fitting by hand. The features of the present invention are the types of heat insulating materials,
Any material can be used between the heat insulating material and its outer wrapping metal foil, so that it can be applied. For example, even if an adhesive such as butyl rubber or EPDM rubber is interposed, There is no problem even if it is exposed, and it has the feature that it can be installed as long as it can be wound using a small metal foil with a springback parameter even in a rectangular part where work is difficult with normal exterior construction I have.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the contents of the present invention will be described in more detail based on embodiments. Examples 1 to 3 are the results of examining the effects of trial production of metal foils having different springback parameters (SBP), winding and constructing the piping. The plated surface was formed under the following conditions. Plating bath formulation Nickel sulfate 350 g / l Nickel chloride 45 g / l Boric acid 35 g / l Sodium lauryl sulfate 0.5 g / l Bath temperature 50 ° C. pH 4.2 Current density 5 A / dm ²

The construction work in the exterior construction method using the above cover member on the heat insulating material for the metal foil pipe is performed in the following procedure. 1. The heat insulating material is pre-formed into a hollow cylindrical shape,
A cut is made in the longitudinal direction of the pipe, and the pipe is fitted and loaded into the pipe. Unlike the conventional case, the work of fixing the heat insulating and heat insulating material cylinder to the pipe is not always necessary. 2. The mounting of the exterior cover member of the present invention is basically performed by winding a metal foil strip as shown in FIG. Since the metal foil strip is extremely thin, by winding it on the heat insulation layer attached to the pipe,
The metal foil and the heat insulating layer easily adhere to each other. In the metal foil terminal, a double-sided tape for bonding is set on the metal foil and the metal foils are adhered to each other in a size obtained by adding a margin of 25 mm to 30 mm to the outer peripheral size of the heat insulating and heat insulating layer. In this case, by adopting a flame-retardant type double-sided tape for bonding, the outer cover member of the present invention can be used in a place where heat resistance is required. As an example of the conventional method, as shown in FIG. 2, a heat insulating tube is wound with an adhesive tape or a wire and fixed to a transportation pipe, and a cover plate is prepared by attaching a bent portion on the tube in advance. Then, the cover plate is connected and sealed at the bent portion.

Comparative Example 1 uses a metal foil having a slightly higher springback parameter (SBP).
In Comparative Example 2, aluminum foil was used instead of metal foil. Comparative Example 3 is a case in which a conventional tin plate is used. In this case, the springback parameter (SBP) is high and the terminal processing cannot be performed sufficiently. In addition, also in the comparative example, the installation work of the piping to the heat insulating and heat insulating material exterior was performed under the same conditions as in the example.

The measurement of the spring back parameter (SBP) in the examples and comparative examples was performed as follows. Accurately measured thickness 5cm width, 10 length
1 cm wide and 5 cm high at the center of the length of the test specimen
A base plate of mm is placed, and the test piece is bent at the center, brought into contact with the base plate and immediately released. Immediately after this, the angle at which the specimen stands up is read, and the product of this value and the specimen thickness (mm) is defined as the springback parameter (SBP). In Examples and Comparative Examples, the average value of 20 test pieces was calculated. As for the condition of the terminal treatment in the construction work, as described in the above-mentioned embodiment, a double-sided adhesive tape was used for the terminal end, and a terminal having a good adhesion state was regarded as “good”. The situation of inundation is one month after the construction. The most characteristic features of the present invention are as follows. In other words, the moisture-proof / waterproof protective construction method of the heat insulating material includes a pipe for flowing and storing a low-temperature (−0 ° C. or lower) or high-temperature (normal temperature or higher) gas-phase material or a liquid material, and the outside of storage tanks. The outer peripheral surface of the heat-insulating material layer laid on the side surface portion is completely concealed and covered with the foil-like outer material of claim 1, and the double-sided adhesive tape of claim 2 is provided on one end surface thereof. Attach and stick the opposite end face to the sticking surface.

[0016] By completely bonding the overlapping portions by pressure bonding, a complete water honey seal is made, and
By preventing the permeation of water, the heat insulating material is prevented from attenuating the effect of heat absorption (cooling / heating) by absorbing moisture and water. The construction method using a metal foil exterior cover member is an extremely simple process that requires only a single installation without using a waterproof and moisture-proof material. The effect of the atmospheric phase (temperature, humidity, moisture, etc.) can be eliminated by the function of resistance to water vapor permeation to maintain the heat insulation performance.

The exterior cover member according to the first aspect is concerned with protecting the heat insulating material layer from physical damage and defects by the following mechanical characteristics. Easily without the need for sophisticated craftsmanship or skill,
In addition, the point is that reliable heat insulation construction can be performed. Mechanical properties of metal foil (thickness = 50 μm) Item --------------- Tensile strength: 80 N / mm ² Burst strength: 160 N / cm ² Bending deformation : 200g Hardness: 80 (HR30T) Elongation: 1.0%

(Example 1) Example of installation of heat insulation (cooling) thermal insulation cover member of straight pipe piping Procedure of work process 1) Installation of heat insulating material Heat insulating material (hollow) made of mineral fiber previously formed into a hollow cylindrical shape The outer diameter of the part is the same as the outer diameter of the tube, or there is a difference in the fitting range.
The cut interface provided in the longitudinal direction is opened and fitted into the tube precursor to be loaded. Fixing of the heat insulating material to be mounted The heat insulating tube mounted as described above has a weak crimping force, so that it easily slips off at the interface with the peripheral surface of the pipe body. Around the waist with tapes at two or three points with respect to the longitudinal direction of the heat retaining cylinder. (In this case, the adhesive force of the tape does not require any special performance and only needs to maintain an adhesive resistance that does not open the cut interface.) B. Instead of using tapes, tie the parts with iron wire in the same way as in b.

2) Attachment of exterior material Foil iron is measured and precut. Foil iron is applied to a heat insulating material layer having a width of 25 mm to 30 mm
It is cut to the size obtained by adding the overlap allowance of mm. A double-sided tape for joining is set on the foil iron. A double-sided adhesive tape is attached to the longitudinal end surface of the cut foil-shaped iron plate.
Stick one side of the loop. A foil-like iron to which a double-sided adhesive tape is stuck is attached. According to the processing method of the second aspect, the tape of the foil-shaped iron plate is pressure-bonded while peeling the release paper of the tape from the outer peripheral portion of the heat insulating material layer.

(Example 2) Procedure of exterior construction work process for heat insulation (cooling) of straight pipes 1) Installation of heat insulating material a. The operation is performed in accordance with the example of the construction procedure described in the first embodiment. 2) Attaching the lowermost exterior material b. The operation is performed in accordance with the example of the construction procedure described in the first embodiment. 3) Attaching two or more steps of exterior materials d. A double-sided adhesive tape is stuck on the outer upper end face of the metal foil mounted in the procedure described in Example 1. e. The lower end surface of the inner surface of the metal foil piece to be mounted on the second stage is temporarily fixed by point bonding by removing a part of the tape release paper to prevent slipping and falling. f. Double-sided adhesive tape stuck to the outer top edge of the bottom metal foil
The edge of the metal foil and the lower end face of the second metal foil are aligned and temporarily fixed. g. A metal foil to which a double-sided adhesive tape is adhered is attached. According to the construction procedure of the second aspect, the tape of the metal foil piece is adhered to the outer peripheral portion of the heat insulating material layer by pressure while peeling off the release paper.

(Example 3) Exterior construction example of indoor exposure duct Procedure of work process 1) Installation of heat insulating material (1). A layered molded product of a mineral fiber layered product or a synthetic resin foam foam fixed material is inserted into a tack attached to a duct driven steel plate or attached by a bonding method. 2) Installation of exterior materials (2). Precut to a size obtained by adding the thickness of the heat insulating material layer in each direction to the size of the duct steel plate precursor and adding the overlap margin. (3). Attach a double-sided adhesive tape to the end of each of the overlap margins of a half of the cut foil-shaped iron exterior plate. (Four). The four corners are bent at 90 ° corners in order to form the foil-like iron exterior plate prepared in the above (2) and (3) into a square of a specified size. (Five). The exterior plate molded in the above (4) is covered with a heat insulating material layer like a jacket. (6). A foil-like iron to which a double-sided adhesive tape is stuck is attached. According to the construction procedure of the second aspect, the tape of the metal foil piece is adhered to the outer peripheral portion of the heat insulating material layer by pressure while peeling off the release paper.

[0022]

As described in the above Examples and Comparative Examples,
Table 1 summarizes examples of plumbing work using various metal plates as exterior cover members.

[Table 1] As described above, the present invention is a gas, water, petroleum, various chemical products,
In the heat insulation work of piping for transporting refrigerant, heat medium, etc.,
By using metal foil with a very smooth surface obtained by controlling the plating conditions for the exterior construction of the heat insulation material, it is possible to ensure the adhesion of the metal foil can. Can be achieved. Further, the most significant feature of the technical effect according to the present invention is that it is intended to heat and cool the gas, water, petroleum, various chemical products, refrigerants, piping for transporting the heat medium, etc., and to tanks for storage. The waterproof / moisture-proof protective material of the heat-insulating material layer, which is an essential material in the heat-insulating work, is eliminated, and the exterior cover member according to the present invention (claim 1) is heated only by direct bonding of the (claim 2). The cutting work is streamlined by shortening the process by eliminating the waterproof / moisture-proof protective material and omitting the installation work, and the insulation work obtained by laying the aforementioned waterproof / moisture-proof material etc. on the heat-insulating material layer only with the exterior material. The effect of realizing the same heat insulation construction effect is exhibited. Such effects of the present invention inevitably result in reduction of material costs and rationalization of steps by omitting steps of laying the same. In addition, the effects obtained by the present invention, such as shortening the process and saving the material, or eliminating the need for the work of a specific technical staff of the sheet metal occupation, greatly contribute to the economic effect of the thermal cutting work.

[Brief description of the drawings]

FIG. 1 is a perspective view of a terminal portion when an exterior work is performed using a cover member of the present invention.

FIG. 2 is a perspective view of an example of an exterior in a case where exterior insulation and heat insulating material exterior construction is performed using a conventional cover member.

[Explanation of symbols]

 1. Piping 2. 2. Insulated heat insulator Exterior cover member 4. 4. Double-sided adhesive tape Folded part 6. 6. Insulation of heat insulating material Insulated insulation fixed wire

Claims (2)

[Claims] 1. An exterior cover member which is a metal foil plated on both sides with a metal and has a springback return parameter of 10 or less. 2. In the exterior construction of a heat insulating material, a metal foil plated with metal on both sides is wound around the heat insulating material, and a tape is attached to an end of the metal foil to adhere the metal foils to each other. Outer construction method of heat insulation material.