WO2004111516A1 - 耐熱性保護管およびその製造方法ならびに耐熱性保護管の製造装置 - Google Patents
耐熱性保護管およびその製造方法ならびに耐熱性保護管の製造装置 Download PDFInfo
- Publication number
- WO2004111516A1 WO2004111516A1 PCT/JP2004/008341 JP2004008341W WO2004111516A1 WO 2004111516 A1 WO2004111516 A1 WO 2004111516A1 JP 2004008341 W JP2004008341 W JP 2004008341W WO 2004111516 A1 WO2004111516 A1 WO 2004111516A1
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- WIPO (PCT)
- Prior art keywords
- heat
- protective tube
- resistant protective
- wollastonite
- tube
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/145—Arrangements for the insulation of pipes or pipe systems providing fire-resistance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
- G01K1/12—Protective devices, e.g. casings for preventing damage due to heat overloading
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
- F16L11/125—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting non-inflammable or heat-resistant hoses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/021—Shape or form of insulating materials, with or without coverings integral with the insulating materials comprising a single piece or sleeve, e.g. split sleeve, two half sleeves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/143—Pre-insulated pipes
Definitions
- the present invention relates to a heat-resistant protective tube, a method for manufacturing the same, and a heat-resistant protective tube manufacturing apparatus.
- the present invention relates to a heat-resistant protective tube, a method for manufacturing the same, and a device for manufacturing a heat-resistant protective tube, which can be used for applications such as protecting a measuring means such as a thermocouple at a high temperature.
- An example of a protective tube for immersion of molten metal is described in, for example, Japanese Utility Model Publication No. 3-45152.
- Patent Document 1 Japanese Utility Model Publication No. 3-45152
- the above-mentioned paper product is wound around the outer periphery of the paper tube.
- a step corresponding to the thickness of the paper product occurs at the winding end, and the number of times of winding varies depending on the location. Wall thickness fluctuations sometimes increased.
- the ceramic fiber molded product is bonded to the paper tube, but at that time, a gap is formed between the ceramic fiber molded product and the paper tube, resulting in a brittle strength. As a result, there was a possibility that the product might be damaged due to the impact during transportation or the pressure when it was pinched by a fixed clamp when mounted on an automatic loading machine.
- diatomaceous earth or the like when used, it has water of crystallization before firing, and when immersed in molten metal, it is rapidly vaporized and released, and a phenomenon called "splash", which is a scattering phenomenon of molten metal, occurs. There is.
- diatomaceous earth fired at a temperature of about 1000 ° C or higher is often used, but baked diatomaceous earth also absorbs moisture in the atmosphere, and immediately absorbs moisture in the atmosphere during humid periods such as the rainy season. Resulting in. Therefore, it was difficult to sufficiently prevent splash.
- the present invention has been made to solve the above-described problems, and is intended to be used as a protective tube when immersed in a high-temperature measurement target and used for measuring temperature, oxygen concentration, and the like.
- a heat-resistant protective tube made of a material that can suppress scattering of the object to be measured, is excellent in heat resistance, heat insulation and impact resistance, and has little adverse effect on the human body, a method of manufacturing the same, and the heat-resistant protection
- An object of the present invention is to provide a tube manufacturing apparatus. Means for solving the problem
- the heat-resistant protective tube according to the present invention is characterized in that wollastonite or a heat-resistant inorganic powder containing 20% by weight or more of wollastonite is added in an amount of 1.5 to 15% by weight in terms of solid content. It is made of a material bonded using an agent.
- Wollastonite has almost no water of crystallization and is a material that hardly absorbs moisture in the atmosphere, and therefore can effectively suppress splash. Further, wollastonite is also a material having excellent heat resistance and heat insulation properties, and a protective tube made using the wollastonite has a strength higher than a predetermined level conventionally. Furthermore, no indication has been made that wollastonite has a negative effect on the human body. Therefore, it is possible to suppress the splash (splash) of the object to be measured when immersed in the object to be measured, and it is excellent in heat resistance, heat insulation and impact resistance, and furthermore has a small adverse effect on the human body. Is obtained.
- the additives include, for example, organic dispersants, organic binders and inorganic binders. At least one of the following.
- the wollastonite is preferably acicular wollastonite.
- a method for manufacturing a heat-resistant protective tube according to the present invention includes the following steps. Wollastonite or a heat-resistant inorganic powder containing 20% by weight or more of wollastonite, an additive of 1.5% by weight or more and 15% by weight or less in terms of solid content, and water or an organic solvent are mixed to form a mixed material. Make it. The mixed material is formed into a tubular shape to produce a tubular molded body. The tubular molded body is dried.
- the inventor of the present application has found that a heat-resistant protective tube having excellent characteristics as described above can be manufactured using a material containing wollastonite by the above method.
- the tubular molded body is manufactured by extrusion molding. Further, the heat-resistant protective tube may be formed on the outer peripheral surface of the paper tube.
- the step of producing the tubular molded body includes a step of producing the tubular molded body on the outer peripheral surface of the paper tube by moving the paper tube in the axial direction while extruding the mixed material onto the outer peripheral surface of the paper tube.
- the step of drying the tubular molded body includes a step of drying the tubular molded body on the outer peripheral surface of the paper tube.
- the flow of the mixed material is locally reduced by providing a portion having a reduced flow channel area in the flow channel of the mixed material.
- the apparatus for manufacturing a heat-resistant protective tube forms a heat-resistant protective tube on the outer peripheral surface of a paper tube.
- a molding die having a space connected to the leading end and receiving the paper tube, and a flow path for guiding the material supplied from the cylinder onto the outer peripheral surface of the paper tube is provided. Then, a throttle portion for locally reducing the area of the flow path is provided in the flow path of the material located in the molding die.
- the apparatus for manufacturing a heat-resistant protective tube includes a molding die having a space for receiving the paper tube and a flow path for guiding the material supplied from the cylinder onto the outer peripheral surface of the paper tube. Therefore, the material can be supplied from the cylinder to the outer peripheral surface of the paper tube through the flow path in the molding die with the paper tube inserted into the space of the molding die. Thereby, the heat-resistant protective tube can be formed on the outer peripheral surface of the paper tube.
- the material can be made into a dense state, and the material in the dense state is supplied onto the outer peripheral surface of the paper tube. can do.
- the heat-resistant protective tube is manufactured using wollastonite, it is possible to suppress scattering (splash) of the measured object when immersed in the measured object, It is possible to obtain a heat-resistant protective tube which is excellent in heat resistance, heat insulation and impact resistance, and has little adverse effect on the human body.
- FIG. 1 is a plan view of a heat-resistant protective tube according to one embodiment of the present invention.
- FIG. 2 is a partial cross-sectional view of a lance thermocouple using the heat-resistant protective tube shown in FIG. 1.
- FIG. 3 is a cross-sectional view showing one example of a lance thermocouple holder shown in FIG. 2.
- FIG. 4 is an enlarged cross-sectional view of a head portion of the heat-resistant protective tube manufacturing apparatus according to one embodiment of the present invention.
- FIG. 5 is a graph showing the relationship between the amount of an additive and the bending strength of a heat-resistant protective tube material.
- FIG. 6 is a graph showing the relationship between the content of wollastonite and the bending strength of a heat-resistant protective tube material.
- the heat-resistant protective tube of the present embodiment comprises wollastonite or heat-resistant inorganic powder containing about 20% by weight or more (preferably 40% by weight or more) of the wollastonite, at least 1.5% by weight or more. It is made of a material bonded using an additive of about not more than 3% by weight (preferably not less than 3% by weight and not more than 10% by weight, more preferably not less than 3% by weight and not more than 5-7% by weight).
- the amounts of wollastonite, heat-resistant inorganic powder and additives are Is an amount in terms of solid content.
- the amount of the additive to be added when the heat-resistant inorganic powder and wollastonite are mixed is an amount based on the total amount of the heat-resistant inorganic powder and wollastonite.
- the heat-resistant protective tube according to the present embodiment is equivalent. Should be interpreted as being. Similarly, even when the amount of the additive is less than 1.5% by weight or more than 15% by weight, the heat resistance in the present embodiment is maintained as long as the effects described below are obtained. It should be interpreted as equivalent to a protection tube.
- Wollastonite (melting point: about 1500 ° C., hardness (Mohs): about 4.5-5.0) is a silicate mineral represented by the chemical formula Ca SiO. Wollastonite produced as a natural mineral is
- wollastonite It is a mineral developed by metamorphism at the interface between limestone and granite. Its color is glassy white, greyish, or brownish.
- the crystalline form of wollastonite is acicular or massive. Wollastonite contains almost equal amounts of Si ⁇ ⁇ ⁇ and CaO as main components, and A1
- wollastonite has almost no hygroscopicity
- a heat-resistant protective tube made of a material containing the wollastonite is immersed in a high-temperature measurement target such as a molten metal
- the water contained in the heat-resistant protective tube can be prevented from abruptly evaporating, and the splash (splash) of the object to be measured accompanying this can be effectively suppressed.
- orastonite is also excellent in heat resistance and heat insulation, it can also suppress the burning of a part of the sensor inside the heat resistant protective tube and the paper tube.
- the heat-resistant inorganic powder that can be used in the present embodiment includes, for example, diatomaceous earth, anoremina, zirconia, mullite, cordierite, ginorecon, magnesia, power lucia, steatite, talc, silicon carbide, silicon nitride, Examples thereof include clay minerals and other ceramic powders having an aspect ratio close to 1 alone or in combination.
- the moldability of the heat-resistant protective tube can be improved, and the surface smoothness of the heat-resistant protective tube can be improved.
- the heat resistance of the heat-resistant protective tube can be improved, and by selecting ceramic powder without crystallization water, splashing can be suppressed.
- a particulate ceramic powder having an aspect ratio close to 1 that has not been pointed out as a carcinogen, it is possible to obtain a heat-resistant protective tube with little harm to the human body.
- Additives that can be used in the present embodiment include, for example, at least one of an organic dispersant, an organic binder, and an inorganic binder.
- an organic dispersant for example, polyacrylate, polycarboxylate, ligninsulfonate, hexametaphosphate and the like can be used.
- the organic binder for example, polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, emulsified biel acetate and the like can be used.
- the inorganic binder for example, silica sol, alumina sol, silica sol 'alumina sol mixture, lithium silicate, silicate, phosphate and the like can be used.
- FIG. 1 is a diagram showing a structural example of a heat-resistant protective tube according to the present embodiment.
- the heat-resistant protective tube 1 is formed, for example, on the outer peripheral surface of a paper tube 2.
- the heat-resistant protective tube 1 can be used as a protective tube for measuring the temperature, oxygen concentration, etc. of the molten metal by immersing it in the molten metal. More specifically, it can be used as a protective tube for a lance thermocouple. When both ends of the dissimilar metal are electrically connected and a temperature difference is applied to both ends, a current flows through the circuit due to the Seebeck effect. Using this principle, a lance thermocouple is used to measure the temperature by immersing it directly in the molten metal.
- FIG. 2 shows a partial cross-sectional view of a lance thermocouple using the heat-resistant protective tube 1 shown in FIG.
- the lance thermocouple includes a temperature detecting end 3 installed inside a paper tube 2 and a cap 4 attached to a tip of a heat-resistant protective tube 1.
- a lance thermocouple When a lance thermocouple is immersed in molten metal, an instrument called a holder is often used.
- Fig. 3 shows an example of this holder.
- the holder includes a connector block 5, a ponole 6, a copper sheath compensating conductor 7, an extension pipe 8, a cabtire compensating conductor 9, a handle 10, and a metal connector 11.
- a lance thermocouple is attached to the tip of this holder together with the heat-resistant protective tube 1, and these are immersed directly in the molten metal to measure the temperature of the molten metal.
- the heat-resistant protective tube of the present embodiment can be used as a molten metal immersion protective tube (thermocouple protective tube) as described above, but can also be used for other applications.
- heat resistance is required, such as heat-insulating materials for hot water insulation material, high-temperature fluid such as molten metal, heat-insulating materials installed outside the high-temperature fluid flow tube, various combustion cylinders, and lining of high-temperature ducts. Can be used for tubular parts.
- a heat-resistant inorganic powder containing wollastonite or wollastonite in an amount of about 20% by weight or more (preferably 40% by weight or more) is used.
- 5% to 15% by weight preferably 3% to 10% by weight, more preferably 3% to 5% to 7% by weight
- an appropriate amount of water or organic solvent are mixed (kneaded) to produce a mixed material.
- the mixed material is typically in the form of a clay, and the mixed material is formed into a tubular shape to produce a tubular molded body. Then, the tubular molded body is dried.
- the above-mentioned tubular molded body is preferably produced by extrusion molding.
- a tubular molded body having a uniform thickness can be easily produced.
- the heat-resistant protective tube may be formed on the outer peripheral surface of the paper tube.
- the tubular material is moved in the axial direction (longitudinal direction) while extruding the mixed material onto the outer peripheral surface of the paper tube, thereby producing a tubular molded body on the outer peripheral surface of the paper tube. What is necessary is just to dry the tubular molded body above.
- the mixed material can be made dense, and a high-quality heat-resistant protective tube can be obtained.
- the heat-resistant protective tube can be formed using, for example, a manufacturing apparatus having a head portion shown in FIG.
- the apparatus for manufacturing a heat-resistant protective tube includes a cylinder 12 for mixing and supplying a material inside, and a molding die 14.
- the molding die 14 is connected to the tip of the cylinder 12 and has a space 15 for receiving the paper tube 2 and a flow path 18 for the mixed material 13 supplied from the cylinder 12.
- the cylinder 12 extends in a direction crossing the longitudinal direction of the molding die 14 (the axial direction of the paper tube 2), and has a screw (not shown) inside.
- the mixed material 13 is mixed (kneaded) to produce the mixed material 13, and the mixed material 13 is sent to the tip side of the cylinder 12, and the tip force of the cylinder 12 is applied to the mold 14.
- the tip of the cylinder 12 is fitted into the molding die 14, and the space in the cylinder 12 for containing the mixed material 13 communicates with the flow path 18 of the mixed material 13 provided inside the molding die 14. .
- the mixed material 13 is sent from the cylinder 12 to the flow path 18 in the molding die 14. Can be.
- an upper holding plate 16 and a lower holding plate 21 are installed at both ends in the longitudinal direction of the forming die 14, and the upper holding plate 16 and the lower holding plate 21 are used to form the forming die 14. Is sandwiched. Further, the inner tube 17 is mounted inside the molding die 14, and a part of the space 15 is defined by the inner peripheral surface of the inner tube 17. A flow path 18 is formed between the outer peripheral surface of the inner tube 17 and the inner surface of the molding die 14.
- a tubular base 19 is mounted inside the lower holding plate 21.
- a taper portion is provided on the inner peripheral surface of the base 19, and a location where the area of the flow path 18 is locally reduced is provided between the tapered portion and the tip of the inner tube 17. That is, the flow path 18 of the mixed material 13 located in the molding die 14 is provided with the throttle portion 20 in which the flow path area of the mixed material 13 is locally reduced.
- the throttle section 20 may be provided in the flow path 18 of the mixed material 13 by a method other than the above.
- the paper tube 2 is inserted into the inner tube 17, that is, into the space 15 of the molding die 14.
- the cylinder 12 is operated, and the kneaded mixed material 13 is supplied to the flow path 18 in the cylinder 12 internal force forming die 14.
- the mixed material 13 flows from the right side to the left side in FIG. 4, is extruded from the cylinder 12, and is sent into the molding die 14.
- the mixed material 13 fed into the molding die 14 collides with the outer peripheral surface of the inner tube 17, and the flow direction changes by about 90 degrees. After that, the mixed material 13 moves along the outer peripheral surface of the inner pipe 17 to the upper side in FIG.
- the paper tube 2 While supplying the mixed material 13 onto the outer peripheral surface of the paper tube 2 as described above, the paper tube 2 is moved in the axial direction (from the upper side to the lower side in FIG. 4). Thereby, the heat-resistant protective tube can be continuously formed on the outer peripheral surface of the paper tube 2. After forming the heat-resistant protective tube in this way, the paper By drying the heat-resistant protective tube on the outer peripheral surface of the tube 2, a heat-resistant protective tube on the outer peripheral surface of the paper tube 2 can be manufactured.
- the average particle diameter of 17. 6 M m, the aspect ratio 10 20 about wollastonite, solid sodium polycarboxylate solution is an organic dispersant, an organic binder carboxymethyl cellulose, silica sol as an inorganic binder as an additive
- an organic dispersant an organic binder carboxymethyl cellulose
- silica sol as an inorganic binder as an additive
- add 80% by weight of ion-exchanged water stir and mix with a Henschel mixer to produce a clay-like molding material.
- the prepared molding material was fitted into a 20 mm X 20 mm X 80 mm mold, heated and dried to prepare a test piece. This test piece was subjected to a three-point bending test by an autograph, and the breaking strength was measured.
- test pieces were prepared in the same manner as in the composition shown in Table 1 below, and subjected to a three-point bending test to measure the breaking strength.
- Figure 5 shows the results. Incidentally, adopting the polycarboxylic acid sodium aqueous organic dispersant as added pressure agent diatomaceous earth, an organic binder carboxymethylcellulose, a silica sol as an inorganic binder material obtained by adding 10 wt 0/0 as the conventional product 2 in FIG. 5 did.
- the average particle diameter of 17. 6 xm, the aspect ratio 10 20 about wollastonite 80 wt 0/0 degree and diatomaceous earth 20% by weight, sodium polycarboxylate solution is an organic dispersing agent, carboxymethyl cellulose as an organic binder, inorganic Addition of about 7% by weight (ratio to the total amount of wollastonite and diatomaceous earth) of silica sol, which is a binder, as an additive in terms of solid content is defined as 100% by weight.
- the mixture is stirred and mixed with a Henschel mixer to produce a clay-like molding material.
- the fabricated molding material was fitted into a 20 mm X 20 mm X 80 mm mold, heated and dried to produce a test piece. The test piece was subjected to a three-point bending test using an autograph, and the breaking strength was measured.
- test pieces were prepared in the same manner as described in Table 2 below, and subjected to a three-point bending test to measure the breaking strength.
- Figure 6 shows the results. Incidentally, adopting the polycarboxylic acid sodium aqueous organic dispersant as added pressure agent diatomaceous earth, an organic binder carboxymethylcellulose, a silica sol as an inorganic binder material obtained by adding 10 wt 0/0 as the conventional product 2 in FIG. 6 did.
- the strength of the test piece varies depending on the amount of the additive. That is, it can be seen that the strength of the test piece increases as the amount of the additive increases. Therefore, in order to obtain strength higher than that of conventional products while minimizing the amount of additives, when the amount of additives is about 7% by weight, wollastonite is about 20% by weight or more, and the amount of additives is It can be seen that when the amount is about 5% by weight, wollastonite is about 30% by weight or more, and when the amount of the additive is about 3% by weight, wollastonite is about 7080% by weight or more.
- Ion-exchanged water equivalent to 80% by weight based on the weight added to about 10% by weight in conversion is added, and stirred and mixed with a Henschel mixer to produce a clay-like molding material.
- the prepared molding material is put into a vacuum extrusion molding machine cooled to about 5 ° C to obtain a pipe-shaped molded body. Thereafter, the pipe-shaped molded body is heated and dried to produce a heat-resistant protective tube.
- a protective tube for immersion of a molten metal which is a heat-resistant protective tube can be manufactured.
- wollastonite with an average particle diameter of 17.6 xm and an aspect ratio of about 10 to 20 is added with an aqueous solution of sodium polycarboxylate as an organic dispersant, carboxymethyl cellulose as an organic binder, and silica sol and alumina sol as inorganic binders.
- aqueous solution of sodium polycarboxylate as an organic dispersant
- carboxymethyl cellulose as an organic binder
- silica sol and alumina sol as inorganic binders.
- the formed molding material is put into a vacuum extrusion molding machine cooled to about 5 ° C.
- the vacuum extrusion molding machine used in Example 4 has a head section shown in FIG.
- the vacuum A paper tube is inserted into the space provided at the center of the base of the extruder head, and the mixed material is supplied from the cylinder of the vacuum extruder onto the outer peripheral surface of the paper tube through a flow path in the head. Then, the paper tube is moved in the axial direction (longitudinal direction) while supplying the mixed material onto the outer peripheral surface of the paper tube. Thereby, a cylindrical molded body can be formed on the outer peripheral surface of the paper tube.
- a protective tube for immersion in molten metal which is a heat-resistant protective tube in Example 4 can be obtained.
- the drying may be natural drying, or the same protective tube can be obtained by leaving it for 2 days and 4 days.
- the protective tube of Example 4 is manufactured by directly applying a material on the outer peripheral surface of the paper tube and drying it as described above, so that the protective tube between the protective tube and the paper tube can be used without using an adhesive. High adhesiveness and high strength are obtained.
- the heat-resistant inorganic powder containing an average particle diameter of 10- 20 ⁇ ⁇ diatomaceous earth about 20% by weight, organic dispersion Sodium polycarboxylate solution, carboxymethylcellulose as organic binder, silica binder and alumina sol as inorganic binders are added as additives at about 3% by weight in terms of solid content (ratio to wollastonite and diatomaceous earth).
- add 60% by weight of ion-exchanged water to this weight stir and mix with a Henschel mixer to produce a clay-like molding material.
- the prepared molding material is put into a vacuum extrusion molding machine cooled to about 5 ° C.
- a vacuum extruder having a head portion similar to that of the above-described fourth embodiment is used, and a paper tube is inserted into the head of the vacuum extruder, and a flow path in the head is inserted.
- the paper tube is moved in the axial direction (longitudinal direction) while supplying the mixed material onto the outer peripheral surface of the paper tube, thereby forming a cylindrical molded body on the outer peripheral surface of the paper tube.
- This is placed in a dryer at 60 ° C. for 8 hours and dried, whereby the heat-resistant protective tube in the fifth embodiment can be obtained.
- the drying may be natural drying, and the same heat-resistant protective tube can be obtained by leaving it for 2 days or 4 days.
- Example 6 Conventionally used paper products wrapped around a paper tube (conventional product 1), diatomaceous earth molded products (conventional product 2), ceramic fiber molded products (conventional product 3), and the combination shown in Table 4 below
- the products of the present invention prepared by the methods of Examples 4 and 5 were prepared by comparison, and the performance of each was evaluated. The results will be described with reference to Tables 3 and 4.
- the conventional product has four types of splash, heat resistance, heat insulation, and impact resistance. Although none of them satisfied all of the performances, as shown in Table 4, it was found that many of the products of the present invention satisfied all of the four performances.
- the additive when the wollastonite is 100% by weight, the additive is set to 3% by weight to 5% by weight, and when the wollastonite is 90% by weight and the diatomaceous earth is 10% by weight, If wollastonite is 40% to 80% by weight and diatomaceous earth is 60% to 20% by weight, the additive is 3% to 5% by weight.
- Table 5 shows the material and additive amount of each of the conventional product and the product of the present invention
- Table 6 shows the test results.
- a bending test a three-point bending test was performed at a distance between supporting points of 260 mm.
- the size of the test sample is 31 mm in outer diameter and 18.5 mm in inner diameter (having a paper tube of 25 mm in outer diameter and 18.5 mm in inner diameter).
- the ceramic fiber molded product used was a product with an outer diameter of 39 mm and an inner diameter of 31 mm and a paper tube with an outer diameter of 30 mm and an inner diameter of 17.6 mm.
- the bending strength of the product of the present invention is higher than that of the conventional products 13. More specifically, Wollastonite 100 weight. In the case of / 0 , the strength increases as the amount of the additive increases, and even in the case of the additive having a mass force of 3 ⁇ 4% by weight, the strength becomes higher than that of the conventional product.
- the amount of the additive is 3% by weight and the amount of olastonite is 80% by weight. 40 weight
- the present invention can be effectively applied to a heat-resistant protective tube, a method for producing the same, and an apparatus for producing a heat-resistant protective tube.
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- General Engineering & Computer Science (AREA)
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- Rigid Pipes And Flexible Pipes (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
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JP2003171008A JP3716280B2 (ja) | 2003-06-16 | 2003-06-16 | 耐熱性保護管およびその製造方法 |
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CN104819782A (zh) * | 2015-04-09 | 2015-08-05 | 赵波 | 一种测温副枪纸管及其生产工艺 |
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JP2006267009A (ja) * | 2005-03-25 | 2006-10-05 | Miyagawa Kasei Ind Co Ltd | 耐熱性保護管 |
JP4704263B2 (ja) * | 2006-03-31 | 2011-06-15 | ニチアス株式会社 | 不定形耐火物成形材料及び不定形耐火物成形体 |
JP5228509B2 (ja) * | 2008-02-04 | 2013-07-03 | ヘレウス・エレクトロナイト株式会社 | 溶融金属測定用プローブ |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3020992U (ja) * | 1995-07-26 | 1996-02-16 | 株式会社リボール | 軽量耐火二層管 |
JPH09133266A (ja) * | 1995-11-09 | 1997-05-20 | Sekisui Chem Co Ltd | 耐火性配管材 |
JP2000257759A (ja) * | 1999-03-09 | 2000-09-19 | Kobe Jushi Kogyo Kk | 耐火性被覆管 |
JP2002310340A (ja) * | 2001-04-10 | 2002-10-23 | Kobe Jushi Kogyo Kk | 耐火性套管製造装置 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10231962A (ja) | 1997-02-19 | 1998-09-02 | Riboole:Kk | 軽量耐火二層管及びその製造方法 |
-
2003
- 2003-06-16 JP JP2003171008A patent/JP3716280B2/ja not_active Expired - Lifetime
-
2004
- 2004-06-15 KR KR1020057022457A patent/KR100847622B1/ko active IP Right Grant
- 2004-06-15 WO PCT/JP2004/008341 patent/WO2004111516A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3020992U (ja) * | 1995-07-26 | 1996-02-16 | 株式会社リボール | 軽量耐火二層管 |
JPH09133266A (ja) * | 1995-11-09 | 1997-05-20 | Sekisui Chem Co Ltd | 耐火性配管材 |
JP2000257759A (ja) * | 1999-03-09 | 2000-09-19 | Kobe Jushi Kogyo Kk | 耐火性被覆管 |
JP2002310340A (ja) * | 2001-04-10 | 2002-10-23 | Kobe Jushi Kogyo Kk | 耐火性套管製造装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104819782A (zh) * | 2015-04-09 | 2015-08-05 | 赵波 | 一种测温副枪纸管及其生产工艺 |
Also Published As
Publication number | Publication date |
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JP3716280B2 (ja) | 2005-11-16 |
KR100847622B1 (ko) | 2008-07-21 |
JP2005009882A (ja) | 2005-01-13 |
KR20060013555A (ko) | 2006-02-10 |
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