JP2004347119A - Heat insulating pipe cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulating pipe cover superior in product quality, handling property and workability, applicable to an already constructed pipeline and capable of maintaining a function as a heat retaining material under any bad conditions. <P>SOLUTION: A pipe cover body 8 molded of a glass fiber mat is cut at its center to be split into two parts and then an aluminum foil 10 is adhered thereto while encircling one center cut face as a starting point. Thus, it can be installed on the already constructed pipeline. It also has waterproof property with the aluminum foil 10. Preferably, the pipe cover body 8, when molded, uses a proper amount of water repellent coating agent mixed into a binder. It is therefore usable as a heat retaining material for the pipeline at an oil refinery company or a general plant site because of water repellent property with the coating agent and waterproof property with the aluminum foil 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat insulating pipe cover in which a pipe cover body is made of glass fiber, and more particularly, to a heat insulating pipe cover that can be used as a heat insulator for all pipelines regardless of the surrounding environment.

  The present applicant has already disclosed a method for manufacturing a heat insulating pipe cover using glass fiber in Korean Patent No. 274314.

  This is a complete pipe cover with high density and no incision by applying a binder to a needle-punched glass fiber mat, winding it around a molding roller, and rotating at high speed while pressing with a pressure roller. Is obtained. Although it has been evaluated as a revolutionary product for the insulation of pipelines, glass fibers that are harmful to the human body are exposed to the outside, so it is difficult to handle and has a bad effect on the health of users, and There was a drawback that it was inferior in commercial properties.

  In addition, since the outer peripheral surface must be covered with a separate outer cover during construction, additional construction costs are incurred, and it cannot be used as an exterior material as such, and since there is no incision, the pipeline that has already been constructed Had the disadvantage that it could not be applied.

  Of course, if the cutting process is added to divide the pipe into two, it can be said that it can be installed in the already constructed pipeline. However, when the two parts are divided in this way, the transportation and handling become rather difficult, and the work and time required for the construction are further increased, and furthermore, it has to be tied up with a tape or a wire, which is troublesome.

  In addition, when exposed to snow or rain, or when water leaks, the high water absorption of the glass fiber tends to cause loss of heat insulation, and the absorption of moisture increases the load on the pipeline. Serious impact on safety. Further, there is a problem that the pipe is easily corroded by the absorbed moisture, and the life of the pipeline is shortened.

Therefore, the pipe cover for heat insulation by the conventional method is used only very limited as a heat insulating material for the interior of the indoor pipeline which is not likely to penetrate moisture. It is hardly adopted in the pipeline construction of companies and general industrial plant sites. For producers, high profits cannot be expected, and for users, there is no choice as a heat insulating material for pipelines, and there is no choice, such as workability, heat insulation, volume, weight, strength, construction cost Existing blocky perlite and silica, which are disadvantageous in terms of surface, had to be used. For this reason, there are great difficulties in terms of economics and maintenance, and the fact is that the development of alternatives is urgent.
JP 2001-208289A

  INDUSTRIAL APPLICABILITY The present invention has a high commercial value, is excellent in handleability and workability, can be applied to already constructed pipelines, and can maintain the function as a heat insulator under any adverse conditions. Providing a cover has its purpose.

  In order to achieve the above object, the present invention provides a cover body formed of glass fiber, which is cut along a center axis (center cutting), and then an aluminum foil is bonded to an outer peripheral surface thereof. It is characterized by having done.

  As described above, according to the present invention, since the outer peripheral surface is wrapped in aluminum foil, not only can the commercial value be improved, but also excellent handleability and workability can be provided.

  In addition, after the split pipe cover body is spread to the left and right and fitted to the pipe, construction can be completed simply by gluing the adhesive part, so construction is easy, and it can be applied to already constructed pipelines. is there.

  In addition, since the glass fiber is not exposed to the outside at all, it can be used as an exterior material itself, and because it has excellent water repellency and waterproofness with aluminum foil, it can be used by companies related to petroleum refining and petrification. It can also be used for thermal insulation of pipelines at general plant sites. Therefore, an increase in profits with an increase in demand can be expected. Also, it can replace existing perlite or silica insulation. As described above, it is satisfactory in all aspects such as installation cost and maintenance.

  FIG. 1 is a perspective view of a heat insulating pipe cover according to an embodiment of the present invention, and FIG. 2 is a side sectional view of FIG. FIG. 3 is a side cross-sectional view showing how the heat-insulating pipe cover of the present invention is constructed, and FIG. 4 is a side cross-sectional view showing how the pipe cover body of the present invention is molded. As shown in FIGS. 1 to 4, the heat insulating pipe cover A according to one embodiment of the present invention is constituted by the following steps. First, a long glass fiber mat 2 is impregnated with a binder in which an appropriate amount of a coating agent is mixed, and is wound around a molding roller 4. Do. Thereafter, when dried, the mold is removed and the pipe cover body 8 is obtained. Then, the obtained pipe cover body 8 is divided into two pieces by center cutting, and an aluminum foil 10 is bonded to the outer peripheral surface of the divided pipe cover body 8.

  In the above, if an appropriate amount of the water-repellent coating agent is mixed in the binder and the resin is allowed to penetrate into the glass fiber mat 2, even if moisture is generated due to dew condensation or water leakage after the installation of the heat insulating pipe cover. Since the water is immediately drained due to the excellent water repellency of the coating agent applied to the glass fiber mat, there is no concern about loss of heat insulation or reduction in the safety of the structure due to the load.

  Here, it is preferable that the glass fiber mat 2 is formed by forming a long glass fiber into a long shape so as to have an appropriate thickness and width, and then densifying it by needle punching.

  Preferably, the binder is obtained by appropriately mixing a silicate binder with a fluorine-based (SWR 430) coating agent, a reinforcing agent, and water. It has been found that it is most preferable to mix and use 1 to 10% of a coating agent, 1 to 10% of a reinforcing agent and 50 to 88% of water in a volume ratio.

  At this time, the coating agent is hardly expected to have water repellency if it is mixed by 1% or less based on the whole amount, and if it is mixed by 10% or more, the water repellency is reduced due to a chemical reaction due to an increase in fluorine content. Rather, it decreases. Further, since the fluorine-based coating agent is expensive and the cost increases as the amount used increases, it is preferable to determine the amount to be supplied within the range of the given input ratio.

  In addition, a thermoplastic resin is mainly used as a reinforcing agent, but if the amount is less than 1%, a desired strength cannot be obtained. If added at 10% or more, although the strength is increased, when used as a high-temperature insulating material, there is a risk of burning due to high temperatures. Therefore, it is preferable to determine the dosage of the reinforcing agent within the range of the given dosage ratio. However, unlike the coating agent, the reinforcing agent need not always be added.

  Binder infiltration into the glass fiber mat can be easily achieved by spraying the binder using a spray before winding it onto the forming roller, or by passing the glass fiber mat through a flooded tank supplied with the binder. Can be done. However, the amount of the binder that penetrates into the glass fiber mat must be absorbed in an amount larger than the amount required for adhesion in consideration of the amount of dehydration during pressure molding by high-speed rotation. However, this can be easily achieved by adjusting the supply speed of the glass fiber mat.

  The molding roller 4 may be selectively used depending on the desired inner diameter and length of the pipe cover main body 8. The molding roller 4 may be coated with a release material before the glass fiber mat 2 is wound, or a chuck may be used. It is preferable to easily remove the mold by attaching (Chuck).

The winding amount of the glass fiber mat 2 wound by the molding roller 4 is standardized because a constant length can be supplied every time using an encoder based on the density per square meter (m ² ) of the glass fiber mat. Becomes possible. Further, it is preferable that the wound end portion of the glass fiber mat be finished in a natural state by brushing.

  After the glass fiber mat 2 is wound in this way, the pressure roller 6 is brought into contact with an appropriate pressing force and is rotated at a high speed together with the molding roller 4 to perform pressure molding. At this time, the excess binder is dehydrated (dewatered), and the shape is maintained by strong adhesive force due to pressure.

  After the pressure molding, drying is performed prior to demolding of the molding roller. In this case, natural drying may be used, but vacuum drying using a dryer is preferable for more rapid and uniform drying. After drying, the glass fiber mat 2 is released from the molding roller 4 to obtain an unprocessed pipe cover body.

  The obtained raw pipe cover body was subjected to surface processing, center cutting (cutting along the axial direction), and side cutting (cutting at both ends in the axial direction) to be divided into two parts having a desired length. The pipe cover body 8 is obtained. At this time, center cutting is performed before side cutting. However, at the time of center cutting, one of the two cut portions facing in the radial direction is not completely cut, and a certain portion is left, so that a sense of unity is prevented from being lost before side cutting. Is preferred.

  The reason for maintaining the sense of unity while leaving one of the two cut portions at the time of center cutting is to facilitate the side cutting and the adhesion of the aluminum foil 10.

  Thereafter, it is preferable to bond the aluminum foil 10 prior to side cutting. That is, first, after applying a binder to the outer peripheral surface of the pipe cover main body 8, the aluminum foil 10 can be easily adhered only by surrounding the aluminum foil 10 with one of the center cutting surfaces as a starting point.

  At this time, the width of the aluminum foil 10 is made longer than that of the pipe cover body 8 so as to have a smooth cut surface during side cutting. In other words, the extension width is formed to be about 30 to 70 mm to form the bonding portion 12, so that the construction can be performed more easily, and further, the heat loss on the center cutting surface is minimized.

  Further, the aluminum foil 10 itself has a low tensile strength, and it is preferable to use a glass cloth with an adhesive to enhance the tensile strength.

  Thereafter, when the binder used for the aluminum foil 10 is sufficiently dried, side cutting is performed. Side cutting can be easily performed by cutting both sides according to the size of the heat insulating pipe cover A given in advance.

  5 and 6 are a perspective view and a side sectional view, respectively, of a heat insulating pipe cover A 'according to another embodiment of the present invention. The characteristic configuration in this embodiment is as follows. When cutting the pipe cover body, the center cutting surface 14 is formed to be as angular or bent as possible. In addition, the connecting protrusions 16 and the connecting recesses 18 are formed on the side cutting surfaces at both ends in the length direction, respectively, so that the connecting protrusions 16 and the connecting recesses 18 are engaged with each other at the time of construction. The other configuration is the same as that of the above-described embodiment, and a detailed description thereof will be omitted.

  In this way, the center cutting surface is formed to be angular, and the connecting protrusions and the connecting grooves are formed on both side edges of the side cutting surface, respectively. There is a disadvantage that the work is difficult. However, there is an advantage that the heat loss on the cutting surface is minimized, and the heat insulating pipe covers A ', A' are more reliably engaged with each other during construction.

  In the present invention, the pipe cover main body 8 divided by cutting is maintained in a connected state by the aluminum foil 10 surrounding the outer peripheral surface thereof, so that excellent handleability and workability can be achieved.

  At the time of construction, after the center cutting part on one side has been sufficiently spread to the left and right and fitted on the outer peripheral surface of the pipe B, the construction can be completed by overlapping and bonding the adhesive part 12 of the aluminum foil 10 with a double-sided tape. Since it can be easily installed on the constructed pipeline and surrounds the aluminum foil 10 on the outer peripheral surface of the pipe cover main body 8, the glass fiber is not exposed to the outside, and thus has a sufficient use value as an exterior material.

  On the other hand, in a preferred embodiment, the glass fiber constituting the pipe cover body 8 has excellent water repellency when coated with a coating agent during the manufacturing process. Therefore, when dew condensation or water leakage occurs in the pipe B after the construction, speed water repellency can be achieved. In addition, if the glass fiber is made water-repellent, there is no risk of losing the function as a heat insulating material, and at the time of water leakage, the presence or absence of the water leakage and the location of the water leakage can be detected more quickly.

  In addition, when water leakage occurs, each heat-insulating pipe cover itself, which is in a connected state, has a substantially complete waterproof property due to the aluminum foil 10 wrapping the outer peripheral surface. Since the water is discharged from the gap, the water can be smoothly discharged, and the location of the leak can be detected immediately.

  On the other hand, when the pipe cover of the present invention is used as a heat insulating material for a pipeline installed outside, the pipe cover is exposed to rain, snow, or the like. Will be shut off. Also, there is almost no danger of moisture penetration through gaps between the pipe covers. In the case where the pipe cover body has water repellency, even if water is permeated, the pipe cover body is quickly water-repelled, so that the function as a heat insulating material can be maintained.

  Further, according to the present invention, since the material itself is very light and can be quickly drained even when water leakage occurs, it is possible to prevent an excessive load from being applied to the structure. Therefore, safety can be ensured and corrosion of the pipe due to moisture can be significantly reduced, so that the life of the pipeline can be extended.

1 is a perspective view showing a heat insulating pipe cover according to an embodiment of the present invention. FIG. 2 is a side sectional view of FIG. 1. FIG. 2 is a side cross-sectional view showing how the pipe cover for heat insulation of the present invention is constructed. FIG. 3 is a side sectional view showing a state of molding the pipe cover body of the present invention. FIG. 9 is a perspective view showing a heat insulating pipe cover according to another embodiment of the present invention. FIG. 7 is a side sectional view of FIG. 6.

Explanation of reference numerals

A: Pipe cover for heat insulation B: Pipe 2: Glass fiber mat 4: Molding roller 6: Pressure roller 8: Pipe cover body 10: Aluminum foil 12: Adhesive part 14: Center cutting surface 16: Coupling projection 18: Coupling recess

Claims (2)

  The pipe cover body formed by molding glass fiber is bisected by cutting along the central axis, and then one of the cutting surfaces thus divided is used as a starting point, and an aluminum foil is attached to the pipe cover. A heat-insulating pipe cover which is adhered so as to surround an outer peripheral surface of a main body. The pipe cover body has irregularities so that the cut surfaces bisected along the central axis are angular or bent, and the cut surfaces at both axial ends form mating surfaces that mesh with each other during construction. The pipe cover for heat insulation according to claim 1 characterized by things.

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