Thermal insulation box for yarn heating rolls and method for its manufacture

Abstract

Thermal insulation box (16) which accommodates a yarn heating roller for heating a yarn (Y), wherein each of the box wall components (30) forming the thermal insulation box (16) comprises a thermal insulation plate (32) and a reinforcing plate (34) made of metal and provided on the thermal insulation plate (32), where an insulation reinforcement plate (33) is provided on a surface of the thermal insulation plate (32), which surface is located on a side opposite the reinforcement plate (34), the box wall components (30) have a door component (30f), in the box wall components (30a, 30b, 30c, 30d, 30e), excluding the door component (30f), a surface of the reinforcing plate (34) arranged on a side opposite the thermal insulation plate (32) functions as each inner surface of the thermal insulation box (16), and in the door component (30f), the reinforcing plate (34) is located on the outside of the thermal insulation plate (32).

Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a thermal insulation box for yarn heating rolls and a method for producing the same.

[0002] JP 2012-214913 A discloses an apparatus for heating and drawing yarns spun from a spinning device. This apparatus includes two roller units for drawing the yarns. Each roller unit includes a heating roller (goddess roll) and a separate roller. In each roller unit, the yarns are wound more than once between the heating roller and the separate roller, and the yarns are heated to a certain temperature due to contact with the heating roller while being wound thereon. Furthermore, the rotational speed (yarn feed speed) of the heating roller of the roller unit on the downstream side in the yarn running direction is higher than the rotational speed of the heating roller of the roller unit on the upstream side.As a result, the yarns preheated by the upstream roller unit are pulled due to the difference in speeds between the two roller units.

[0003] However, in the above-mentioned JP 2012-214913 A, the roller units with the heating rollers are housed in a thermal insulation box. Although JP 2012-214913 A does not specifically describe the structure of the thermal insulation box, the thermal insulation box constructed as described below was known, for example. Fig. Figure 8 is a perspective view of the known thermal insulation box. The thermal insulation box 100 shown in Fig. 8, comprises a box 101 and a frame 101c formed by metal plates made of stainless steel or the like. The gap between an inner wall 101a and an outer wall 101b of the box 101 is filled with an amorphous heat-insulating material 103, such as rock wool.

[0004] The above thermal insulation box 100 is manufactured in the following manner. First, the inner wall 101a and the outer wall 101b of the box 101 are constructed by welding several metal plates together. Several reinforcing ribs are provided between the inner wall 101a and the outer wall 101b. Subsequently, the gap between the inner wall 101a and the outer wall 101b of the box 101 is filled with the heat-insulating material 103, such as rock wool. Then, the frame 101c is welded to the box 101 to close the gap between the inner wall 101a and the outer wall 101b, which is filled with the heat-insulating material 103. Although in Fig. 8, an openable door is attached to the thermal insulation box 100 to cover the front surface. Similar to the box 101, the door is completely framed by metal plates and has a heat-insulating structure after its interior is filled with an amorphous heat-insulating material such as rock wool.

[0005] Further designs known to date are disclosed in CN 2 01 686 776 U, DE 19 30 395 A, CN 2 03 014 300 U and JP S63 162 230 A. SUBJECT OF THE INVENTION

[0006] The Fig. The known thermal insulation box shown in Figure 8 has the following problems. First, the operation of welding several large metal plates together to construct the outer wall and the inner wall requires a lot of labor. Second, because the thermal insulation property of rock wool is not very good, the thermal insulation performance of the thermal insulation box is low, and thus the amount of heat radiation to the outside, that is, the loss of heat energy, is large. Third, when the amorphous thermal insulation material 103, such as rock wool, is filled into the gap between the inner wall 101a and the outer wall 101b of the box 101, it is difficult to deliver the thermal insulation material 103 to portions that are difficult to reach by hand, such as the back of the inner wall 101a and the inner corners of the outer wall 101b. For this reason, the filling density of the thermal insulation material 103 after filling may be uneven depending on the worker's skill.

[0007] In addition to the above, because the widely used heat-insulating material, such as rock wool, is amorphous and lacks strength, the rigidity of the thermal insulation box must be ensured by the metal plates forming the inner wall 101a and the outer wall 101b. In this regard, if thick metal plates are used to improve rigidity, the thermal insulation box will be heavy, and thus handling and maintenance will deteriorate. If the reinforcing rib is provided between the inner wall 101a and the outer wall 101b to improve the rigidity of the thermal insulation box, instead of using thick metal plates, the thermal insulation will deteriorate because the internal heat is transferred from the inner wall 101a to the outer wall 101b via the reinforcing rib.

[0008] An object of the present invention is to provide a thermal insulation box that is easy to assemble. Another object of the present invention is to provide a thermal insulation box that has high and uniform thermal insulation.

[0009] These objects are achieved by a thermal insulation box according to claim 1 and a method for producing the thermal insulation box according to claim 11. Further embodiments emerge from the dependent claims.

[0010] According to the first aspect of the present invention, a thermal insulation box accommodates a yarn heating roller for heating yarns, wherein each of the box wall members constituting the thermal insulation box includes a thermal insulation plate and a reinforcing plate made of metal and provided on the thermal insulation plate.

[0011] An insulation reinforcement plate is provided on a surface of the thermal insulation plate, which surface is located on a side opposite the reinforcement plate. The box wall components have a door component. In the box wall components, except for the door component, a surface of the reinforcement plate that is on a side opposite the thermal insulation plate serves as each inner surface of the thermal insulation box, and in the door component, the reinforcement plate is located on the outer side of the thermal insulation plate.

[0012] According to the present invention, the box wall component of the thermal insulation box is constructed such that the thermal insulation plate is provided on the metal reinforcement plate. Therefore, each of the box wall components is formed by providing the thermal insulation plate on the reinforcement plate. Each of the box wall components is formed by providing the thermal insulation plate on the reinforcement plate and then bonding the box wall components together, or by bonding the reinforcement plates together in advance and providing the thermal insulation plate on each reinforcement plate. In either case, the thermal insulation box is constructed very lightly. Moreover, the thermal insulation of the thermal insulation plate, which is made of, for example, a foamed plastic or the like, is typically several times higher than the thermal insulation of rock wool or the like.The thermal insulation of each box wall component is therefore improved, and the overall thermal insulation performance of the thermal insulation box is enhanced. Furthermore, the process of attaching the thermal insulation plate is simply completed by providing the thermal insulation plate of a specific size to the reinforcement plate. Therefore, the thermal insulation of the thermal insulation box is not easily uneven, even if an unskilled worker performs the process.

[0013] According to this arrangement, the surface of the thermal insulation plate located on the opposite side to the reinforcement plate is further protected by the insulation reinforcement plate. Furthermore, after the insulation reinforcement plate is provided, a so-called sandwich structure is realized by sandwiching the thermal insulation plate, which has relatively low strength, between the reinforcement plate and the insulation reinforcement plate, which has high strength, and thus the overall strength is improved. It should be noted that the insulation reinforcement plate can be configured in various ways; for example, the plate is formed by a plate-shaped component or a solid layer formed by applying a liquid resin and curing it.

[0014] According to the second aspect of the invention, the thermal insulation box of the first aspect is configured such that, in each of the box wall components, the metal-fabricated reinforcing plate is provided on only one of an inner wall surface of the thermal insulation plate facing the inside of the thermal insulation box and an outer surface of the thermal insulation plate facing the outside of the thermal insulation box.

[0015] In the previously described, well-known thermal insulation box, which is Fig. As shown in Figure 8, the inner wall 101a of the box 101 is connected to the outer wall 101b that contacts the outside air via metal components with high thermal conductivity, such as the metal frame 101c and a reinforcing rib (not shown). The same applies to the door of the thermal insulation box. Because of this arrangement, the internal heat is transferred to the outer wall 101b due to heat conduction, resulting in the release of heat energy to the outside air. Furthermore, the outer wall 101b becomes disadvantageously hot.

[0016] In this regard, according to the present invention, because the metal reinforcement plate with high thermal conductivity is provided only on the inner surface or the outer surface of the thermal insulation plate, the amount of heat released from the inside to the outside through the reinforcement plate is limited. That is, when the reinforcement plate is provided only on the outer surface of the thermal insulation plate, the hot air in the thermal insulation box does not directly contact the metal reinforcement plate, and the heat is transferred to the reinforcement plate forming the outer surface of the thermal insulation box only via the thermal insulation plate. Therefore, the reinforcement plate, which is the outer surface, does not become hot, and thus the amount of heat energy radiated from the outer surface is limited.However, if the reinforcement plate is provided only on the inner surface of the thermal insulation plate, the reinforcement plate forming the inner surface of the thermal insulation box will become hot due to the hot air in the thermal insulation box, but the heat conduction through the thermal insulation plate will be restricted. Therefore, the heat energy transferred to the outer surface of the thermal insulation box will be restricted, and thus the amount of heat energy radiated to the outer surface will be restricted.

[0017] According to the third aspect of the invention, the thermal insulation box of the first aspect or the second aspect is preferably configured such that the thermal insulation plate is made of foamed plastic. The thermal insulation performance of the thermal insulation box is good in this case.

[0018] According to the fourth aspect of the invention, the thermal insulation box according to any one of the first to third aspects is configured such that a side plate made of metal is provided at an edge part of the reinforcing plate so as to extend from the edge part in a direction orthogonal to the reinforcing plate.

[0019] Because the metal side plate is provided at the edge of the reinforcement plate, the bending strength of the box wall component is improved, thus increasing the overall strength of the thermal insulation box. Furthermore, the thickness of the reinforcement plate can be reduced, thus reducing the weight of the thermal insulation box.

[0020] According to the fifth aspect of the invention, the thermal insulation box of the fourth aspect is configured such that the reinforcing plate and the side plate are formed by integral molding.

[0021] Because it is not necessary to connect the reinforcement plate and the side plate by welding or the like, the box wall component can be easily formed.

[0022] According to the sixth aspect of the invention, the thermal insulation box of the fourth or fifth aspect is configured such that the side plate extends from the reinforcing plate to a side where the thermal insulation plate is provided.

[0023] According to the invention, because the side surfaces of the thermal insulation plate provided on the reinforcing plate are covered by the side plate, the side surface of the thermal insulation plate is protected by the side plate.

[0024] According to the seventh aspect of the invention, the thermal insulation box of the sixth aspect is configured such that the side plate is provided on at least each of the two parts of the edge part of the reinforcing plate, which parts are opposite to each other in a direction parallel to the plane of the reinforcing plate, and the thermal insulation plate is received in a space between the side plates and provided on the reinforcing plate.

[0025] Because the side plates are provided at two parts of the edge portion of the reinforcement plate, which are opposite each other in the direction parallel to the plane of the reinforcement plate, the strength of the box wall component is further improved. Furthermore, the thermal insulation plate is easily installed by simply accommodating the thermal insulation plate in the space sandwiched between the side plates. Furthermore, the side plates limit any positional deviation of the thermal insulation plate relative to the reinforcement plate.

[0026] According to the eighth aspect of the invention, the thermal insulation box of the seventh aspect is configured such that the side plates are seamlessly formed on the entire circumference of the edge part of the reinforcing plate such that a metal box is formed by the reinforcing plate and the side plate, and the thermal insulation plate is accommodated in a space in the metal box and is provided on the reinforcing plate.

[0027] Because the side plate is seamlessly formed around the entire perimeter of the edge portion of the reinforcement plate, the metal box is high-strength, and thus the box wall component is significantly stronger. Furthermore, because the entire perimeter of the side surfaces of the thermal insulation plate is covered by the side plate, the side surface of the thermal insulation plate is securely protected. Furthermore, any positional deviation of the thermal insulation plate relative to the reinforcement plate is reliably limited by the side plate.

[0028] According to the ninth aspect of the invention, the thermal insulation box according to any one of the first to eighth aspects is configured such that, in at least one of the box wall components, a surface of the reinforcing plate, which surface is located on a side opposite to the thermal insulation plate, faces the interior of the thermal insulation box and functions as an inner surface of the thermal insulation box.

[0029] The metal reinforcement plate has a higher surface hardness than the thermal insulation plate. Therefore, even if yarns wound on the heating roller hit the inner surface of the thermal insulation box due to a yarn break, or if a worker hits the inner surface of the thermal insulation box with a suction gun during yarn threading, the inner surface will not be easily damaged if a surface of the reinforcement plate, which is located on the opposite side to the thermal insulation plate, forms the inner surface of the thermal insulation box. Furthermore, because the metal reinforcement plate has a smooth surface, cleaning is easy even if dirt, such as oil from the yarns, yarn residue, or dirt, adheres to the inner surface of the thermal insulation box.

[0030] According to the tenth aspect of the invention, the thermal insulation box according to an eighth aspect is configured such that an insulation layer is provided on the outer surface in the door component.

[0031] According to the eleventh aspect of the invention, a method for manufacturing a thermal insulation box according to any one of the preceding aspects, which accommodates a yarn heating roller for heating yarns, comprises: a manufacturing step of joining a plurality of reinforcing plates to each other, and a box wall member forming step of forming box wall members constituting the thermal insulation box by providing thermal insulation plates on the respective reinforcing plates.

[0032] According to the present invention, the box is formed by bonding metal reinforcement plates together. Furthermore, in the box wall member forming step, the box wall member with high thermal insulation performance is formed such that the box wall members are formed by providing the thermal insulation plates to the corresponding reinforcement plates. Moreover, the work is completed by only providing the thermal insulation plate to the reinforcement plate. For this reason, the thermal insulation of the thermal insulation box is not easily uneven even if no skilled worker performs the work. Note that the order of executing the manufacturing step and the box wall member forming step (for providing the thermal insulation plate) is not particularly limited, and any step can be performed first.

[0033] According to the twelfth aspect of the invention, the method according to the eleventh aspect further comprises a metal box forming step of seamlessly providing a side plate extending in a direction orthogonal to the reinforcing plate on the entire circumference of an edge part of the reinforcing plate to form a metal box made by the reinforcing plate and the side plate in the manufacturing step, wherein metal boxes each formed in the metal box forming step are joined to each other.

[0034] Because the side plate is seamlessly formed along the entire circumference of the edge part of the reinforcement plate, the metal box is high-strength, and therefore the box wall component is significantly strong.

[0035] According to the thirteenth aspect of the invention, the method of the twelfth aspect is arranged such that in the box wall member forming step, the thermal insulation plate is accommodated in the space in the metal box and is provided on the reinforcing plate.

[0036] The thermal insulation plate is therefore very easy to install if the installation of the plate is completed by simply accommodating the thermal insulation plate in the metal box formed by the reinforcement plate and the side plate in an embedded manner. Furthermore, because the side plate is seamlessly formed around the entire periphery of the edge portion of the reinforcement plate, any positional deviation of the thermal insulation plate relative to the reinforcement plate is reliably limited by the side plate. Furthermore, because the entire side surfaces of the thermal insulation plate are covered by the side plate, the side surfaces of the thermal insulation plate are securely protected. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front view showing a schematic arrangement of a spun yarn take-up device of the present embodiment. Fig. 2 is a perspective view of a thermal insulation box. Fig. 3 is an exploded perspective view of a single box wall component of the thermal insulation box. Fig. 4 is a longitudinal section of the thermal insulation box when a door component is closed. Fig. Figure 5 is a longitudinal section of the thermal insulation box with a differently designed door component. Each of the Fig. 6A to 6E is a perspective view of a box wall component of a modification. Fig. 7 is a perspective view of a thermal insulation box according to another modification. Fig. 8 is a perspective view of a known thermal insulation box. DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] Now, an embodiment of the present invention will be described. Fig. 1 is a front view showing the schematic structure of a spun yarn take-up device of the present embodiment. As shown in Fig. 1, the spun yarn take-up device 1 comprises a spun yarn pulling device 3 and a yarn winding device 4.

[0038] The spun yarn drawing device 3 is configured to draw yarns Y produced by continuously spinning a molten fibrous material, such as polyester, from a spinning device 2 provided above. The spun yarn drawing device 3 includes components such as an oil guide 10 and five godet rolls 11 to 15 (yarn heating rolls of the present invention). The oil guide 10 can apply oil to the yarns Y spun from the spinning device 2.

[0039] The five godet rolls 11 to 15 are respectively driven in rotation by motors (not shown). The five godet rolls 11 to 15 are heating rolls, each of which has a heater therein and is housed in a rectangular, parallelepiped-shaped thermal insulation box. A yarn inlet 16a for introducing the yarns Y into the thermal insulation box 16 and a yarn outlet 16b for removing the yarns Y from the thermal insulation box 16 are formed by a right wall component of the thermal insulation box 16. The structure of the thermal insulation box 16 is described in detail below.

[0040] The yarns Y, to which the oil was applied at the oil guide 10, are guided from the yarn inlet 16a via a guide roller 17 into the thermal insulation box 16. The yarns Y introduced into the thermal insulation box 16 are wound in series onto the five godet rollers 11 to 15 individually by the lowest godet roller 11.

[0041] The lower three godet rolls 11 to 13 are heating rolls for preliminary heating the yarns Y before drawing, and the heating temperatures thereof (roll surface temperatures) are set at temperatures equal to or higher than a glass transition temperature of the yarns Y (e.g., set at 80°C). Meanwhile, the upper two godet rolls 14 and 15 are heating rolls for thermally setting the drawn yarns Y, and the heating temperatures thereof are set at higher temperatures than the heating temperatures of the lower three godet rolls 11 to 13 (e.g., set at 120°C). The yarn feed speeds of the upper two godet rolls 14 and 15 are higher than those of the lower three godet rolls 11 to 13.

[0042] The yarns Y introduced into the thermal insulation box 16 are initially preliminarily heated to a drawable temperature while being moved by the lower three godet rolls 11 to 13. The preliminarily heated yarns Y are then drawn due to the difference in yarn feed speeds between the two godet rolls 13 and 14. Furthermore, the yarns Y are heated to a high temperature while being moved by the upper two godet rolls 14 and 15, with the result that the drawn state is thermally fixed. The yarns Y drawn as described above are taken out of the thermal insulation box 16 through the yarn outlet 16b and then sent to the yarn winder 4 by the guide roller 18.

[0043] The yarn winding device 4 is provided below the spun yarn drawing device 3. This yarn winding device 4 comprises components such as a bobbin holder 20 and a contact roller 21. The bobbin holder 20 is arranged in the direction orthogonal to the plane of Fig. 1 is elongated and is rotationally driven by a motor (not shown). A plurality of bobbins 22 are mounted on this bobbin holder 20 along the axial direction. The bobbin winding device 4 rotates the bobbin holder 20 to simultaneously wind the yarns Y onto the bobbins 22 to form a plurality of wound packages 23. The contact roller 21 contacts the surfaces of the wound packages 23 and applies a specific contact pressure thereto to adjust the shape of each wound package 23.

[0044] The thermal insulation box 16 which accommodates the five godet rolls 11 to 15 will now be described. Fig. 2 is a perspective view of the thermal insulation box. Fig. 3 is an exploded perspective view of a single box wall component of the thermal insulation box. Fig. Figure 4 is a longitudinal section of the thermal insulation box when a door component is closed. As shown in Fig. 2 are defined upward, downward, leftward, rightward, upward, and downward from the thermal insulation box 16, and these directions are used appropriately in the following description.

[0045] As in Fig. 2 to Fig. As shown in FIG. 4, the thermal insulation box 16 has a rectangular parallelepiped shape after six box wall members 30 are connected together. The six box wall members 30 are composed of an upper wall member 30a, a lower wall member 30b, a left wall member 30c, a right wall member 30d, a rear wall member 30e, and a door member 30f, which is rotatably attached to the front end portion of the left wall member 30c by a hinged suspension or the like. Two cams are formed at a lower end portion and an upper end portion of the right wall member 30d, respectively, as the yarn inlet 16a and the yarn outlet 16b.

[0046] As in Fig. 3, each of the six box wall components 30 is a panel including a metal box 31, a thermal insulation plate 32, and an insulation reinforcement plate 33. The metal box 31 is a rectangular box structure formed by metal plates made of stainless steel or the like, and can accommodate the thermal insulation plate 32 therein. The metal box 31 has a reinforcement plate 34 and a side plate 35 formed by integral compression molding. Specifically, at an edge portion of the rectangular reinforcement plate 34 serving as a bottom portion of the metal box 31, the side plate 35 is provided to extend in a direction orthogonal to the plane of the plate 34, and at a side where the thermal insulation plate 32 is provided (i.e., in Fig. 3 upwards). The side plate 35 is seamless over the entire circumference of the edge portion of the reinforcing plate 34.

[0047] The thermal insulation plate 32 is made of a material having lower thermal conductivity than metal. In the present embodiment, the plate 32 is specifically made of a foamed plastic (synthetic plastic foam). Because the heating temperatures of the godet rolls 11 to 15 housed in the thermal insulation box 16 are set to, for example, 80 to 120°C, the thermal insulation plate 32 constituting the thermal insulation box 16 must withstand temperatures equal to or higher than these set temperatures. If heat resistance is insufficient, the thermal insulation coating may be formed on the surfaces of the reinforcing plate 34 and the side plate 35 that contact the surfaces of the thermal insulation plate 32.Furthermore, consequently, the thermal insulation of the thermal insulation plate 32 is preferably as high as possible in order to limit the heat radiation from the thermal insulation box 16 to the outside.

[0048] As the foamed plastic preferably used for the thermal insulation plate 32, a foamed thermosetting plastic is preferably used with consideration of thermal resistance. An example of such a foamed thermosetting plastic is phenolic plastic (phenolic foam). While the heat transfer coefficient of rock wool, which is used in a conventional thermal insulation box, is 0.05 W / (m·K), the heat transfer coefficient of the foamed phenolic plastic (JIS A 9511 phenolic foam) is 0.022 W / (m·K). Considering the cost, a material with lower thermal insulation properties can be used instead of phenolic foam. Examples of other available materials with a density of 16 kg / m 3or more include a glass wool board (with a heat transfer coefficient of 0.045W / (m·K)) and a carbonized cork board (with a heat transfer coefficient of 0.041W / (m·K)), which are fibrous thermal insulation materials; epoxy resin (with a heat transfer coefficient of 0.19W / (m·K)) and Bakelite (with a heat transfer coefficient of 0.21W / (m·K)), which are plastic thermal insulation materials; and a vacuum insulation material (with a heat transfer coefficient of 0.0052W / (m·K)). The thermal insulation board 32 is pre-cut to be substantially the same size as the reinforcement plate 34 of the metal box 31, is embedded in the metal box 31, and is provided on the reinforcement plate 34. The side plate 35, which completely frames the edge portion of the reinforcing plate 34, limits a positional deviation between the thermal insulation plate 32 and the reinforcing plate 34.To ensure the prevention of positional deviation, the thermal insulation plate 32 accommodated in the metal box 31 may be fixed to the metal box 31 by an adhesive or the like.

[0049] The insulation reinforcement plate 33 is provided on one surface of the thermal insulation plate 32 (which surface is located on the side opposite the reinforcement plate 34) to cover the entirety of the thermal insulation plate 32. To protect the thermal insulation plate 32, the insulation reinforcement plate 33 is made of a material with high rigidity and strength, even if the thermal insulation thereof is slightly inferior to the thermal insulation of the thermal insulation plate 32. Furthermore, to ensure the heat retention property, the insulation reinforcement plate 33 is made of a material that is better in thermal insulation than the reinforcement plate 34 of the metal box 31. An example of such a material is a thermosetting plastic, such as phenolic plastic. As shown in Fig. Further, as shown in Figure 3, a coating layer 36 may be formed between the thermal insulation plate 32 and the insulation reinforcement plate 33 by applying a liquid coating agent such as silicon. As the coating agent of the coating layer 36 permeates through the gaps of the metal box 31, the thermal insulation plate 32, and the insulation reinforcement plate 33, the gaps are sealed, resulting in the prevention of oil and foreign matter from entering the metal box 31, thus preventing deterioration of the thermal insulation plate 32.

[0050] As in Fig. 2 and Fig. As shown in Fig. 4, the five box wall members 30a to 30e, excluding the door member 30f, are connected to each other such that a surface of the reinforcement plate 34 of the metal box 31, which surface is located on the side opposite to the thermal insulation plate 32, faces the interior of the thermal insulation box 16. Therefore, in the five box wall members 30a to 30e, the surface of the reinforcement plate 34 on the side opposite to the thermal insulation plate 32 functions as each inner surface of the thermal insulation box 16, and the thermal insulation plate 32 is located on the outer side of the reinforcement plate 34. Due to this arrangement, temperatures of the outer surfaces of the five box wall members 30a to 30e do not become very high.

[0051] However, in the case of the door component 30f, the reinforcement plate 34 of the metal box 31 is located on the outside of the thermal insulation plate 32, and the surface of the reinforcement plate 34 on the side opposite the thermal insulation plate 32 does not face the inside of the thermal insulation box 16. Only the door component 30f is configured in this way for the following reason. A structure such as a knob 37 is attached to the outer surface of the door component 30f, and therefore, the outer surface of the door component 30f must have sufficient rigidity to support the structure. This means that the knob 37, as shown in Fig. 4, is easily attached by a screw or the like to the high-strength reinforcing plate 34 provided on the outside of the thermal insulation plate 32.

[0052] It should be noted that the knob 37 may be attached to a side surface of the door component 30f. In such a case, the Fig. 4, the reinforcement plate 34 of the metal box 31 faces the interior of the thermal insulation box. However, in an arrangement described below, in particular, the reinforcement plate 34 of the metal box 31 must face the exterior of the thermal insulation box 16, even if the knob 37 is attached to the front surface or side surface of the door component 30f. Fig. Figure 5 is a longitudinal section of a thermal insulation box with a differently designed door component. Fig. In the arrangement shown in Figure 5, the front ends of the godet rollers 11 to 15 (only three godet rollers 11, 13 and 15 are in Fig. 5) protrudes from the front surfaces of the upper wall member 30a, the lower wall member 30b, the left wall member 30c, and the right wall member 30d. In this case, it is necessary to provide a space on the inside of the door member 30f to avoid interference with the front ends of the godet rollers 11 to 15. The door member 30f is therefore U-shaped in cross section. In such a door member 30f, the reinforcing plate 34 of the metal box 31 must be located on the outside of the thermal insulation box 32 in order to attach the handle 37 to the front or side surface of the door member 30f.

[0053] In addition to the above, the metal reinforcement plate 34 does not become scalding hot due to the presence of the thermal insulation plate 32. However, if this reinforcement plate 34 in the door member 30f is exposed to the outside, a worker may directly touch the reinforcement plate 34, which is hotter than room temperature, when the worker opens or closes the door member 30f. As shown in Fig. 4 and Fig. Therefore, as shown in FIG. 5, in the door member 30f, an insulation layer 38 is further provided on the outer surface of the metal box 31. The insulation layer 38 may be identical to or different from the insulation reinforcement plate 33 provided on the thermal insulation plate 32 in terms of material or the like. Moreover, in the door member 30f, the thermal insulation plate 32 is exposed on the inside of the thermal insulation box 16. In this regard, in order to prevent the thermal insulation plate 32 from being damaged by yarn scraps or a torn end of the moving yarn, a protective plate (not shown) may be provided on a surface of the thermal insulation plate 32, which surface is on the inside of the thermal insulation box 16.

[0054] As in Fig. As shown in FIG. 4, the thermal insulation box 16 is attached to the rear wall member 30e on a base 40 that supports the components of the spun yarn drawing device 3. Specifically, spacers 42 made of plastic are provided between the reinforcement plate 34 of the rear wall member 30e and the base 40, and a plurality of screws 41 are inserted into the corresponding spacers 42. Thus, the thermal insulation box 16 is fixed to the base 40. In order to limit heat radiation from the thermal insulation box 16 to the outside via the screws 41 as much as possible, the screws 41 are preferably made of plastic rather than metal.

[0055] A method for manufacturing the above-described thermal insulation box 16 will now be described. The manufacturing method of the thermal insulation box 16 essentially includes a step of forming each of the six metal boxes 31 (metal box forming step), a step of joining the six metal boxes 31 together (assembly step), and a step of forming the box wall member 30 by providing the thermal insulation plate 32 or the like to the six metal boxes 31 (box wall member forming step).

[0056] These steps are performed according to one of the following two sequences. One of these sequences is selected appropriately, taking into account workability or similar considerations. (1) The metal box forming step is carried out first, the assembling step (for connecting the six metal boxes 31 together) is carried out second, and the box wall member forming step (for providing the thermal insulation plate 32 or the like to the metal box 31) is carried out third. (2) The metal box forming step is carried out first, the box wall component forming step is carried out second, and the assembly step is carried out third. (Metal box training step)

[0057] First, a single metal plate is punched to integrally form the reinforcement plate 34 and the side plate 35 to form the metal box 31. In this way, six metal boxes 31 are formed. (Building step)

[0058] During the assembly step, the six metal boxes 31 are connected to each other. The six metal boxes 31 can be connected to each other by welding or using fasteners such as screws. As shown in Fig. In this regard, as shown in FIG. 4, the metal boxes 31 of the five box wall components 30a to 30e, excluding the door component 30f among the six box wall components 30, are connected to each other such that the surface of the reinforcement plate 34 on the side opposite the thermal insulation plate 32 faces the interior of the thermal insulation box 16. Furthermore, the door component 30f is pivotally connected to the metal box 31 of the left wall component 30c by a hinge or the like such that the reinforcement plate 34 is located on the outside of the thermal insulation plate 32 when the door component 30f is closed. (Box wall component training step)

[0059] The thermal insulation plate 32, which has been pre-cut to be substantially as large as the reinforcement plate 34 in area, is housed in the metal box 31 and is provided and applied to the reinforcement plate 34. Subsequently, a coating agent such as silicon is applied to the surface of the thermal insulation plate 32 to form the coating layer 36. Finally, the insulation reinforcement plate 33 made of phenolic resin or the like is provided on one surface of the coating layer 36 (which surface is on the side opposite the reinforcement plate 34). Formation of the insulation reinforcement plate 33 can be performed by providing a plastic sheet on the coating layer 36, or by applying a liquid curable resin to the surface of the coating layer 36 and curing the resin.The six box wall components 30 are formed by repeating the above operations. For the door component 30f, an additional operation is performed to provide the insulation reinforcement plate 33 on a surface of the reinforcement plate 34, which surface is located on the side opposite to the side where the thermal insulation plate 32 is provided.

[0060] The thermal insulation box 16 of the present embodiment described above has the following effects. (1) Each of the six box wall members 30 has a panel structure in which the thermal insulation panel 32 made of foamed plastic and the reinforcing panel 34 made of metal are laminated. For this reason, a panel serving as the box wall member 30 can be easily formed by providing the thermal insulation panel 32 on the reinforcing panel 34. Moreover, since the structure of the frame of the thermal insulation box 16 is completed merely by connecting the six metal boxes 31 together, the thermal insulation box 16 is constructed very lightly. Moreover, the thermal insulation of the thermal insulation panel 32 made of foamed plastic is several times higher than the thermal insulation of rock wool or the like that has been conventionally used.Therefore, the thermal insulation of each box wall component 30 is high, and thus the overall thermal insulation performance of the thermal insulation box 16 is improved. Furthermore, since the work of attaching the thermal insulation plate 32 is completed only by providing the thermal insulation plate 32 of the specified size to the reinforcement plate 34, the thermal insulation of the thermal insulation box 16 is not easily uneven even if an unskilled worker performs the work. (2) Among the six box wall members 30, in the box wall members 30a to 30e, the reinforcing plate 34 having high thermal conductivity is provided only on the inner surface of the thermal insulation plate 32. Meanwhile, in the door member 30f, the metal reinforcing plate 34 is provided only on the outer surface of the thermal insulation plate 32. For this reason, in each of the six box wall members 30, the amount of heat leaking to the outside through the reinforcing plate 34 is limited. In other words, when the reinforcing plate 34 is provided only on the outer surface of the thermal insulation plate 32, the hot air in the thermal insulation box 16 does not directly contact the metal reinforcing plate 34, and the heat is transferred to the reinforcing plate 34 constituting the outer surface of the thermal insulation box 16 only via the thermal insulation plate 32.Therefore, the reinforcement plate 34, which is the outer surface, does not become hot, and thus the amount of heat radiated from the outer surface is limited. Furthermore, if the reinforcement plate 34 is provided only on the inner surface of the thermal insulation plate 32, the reinforcement plate 34 forming the inner surface of the thermal insulation box 16 does not become hot due to the hot air in the thermal insulation box 16, but heat conduction is limited by the thermal insulation plate 32. Therefore, the heat energy transferred to the outer surface of the thermal insulation box 16 is limited, and thus the amount of heat energy radiated from the outer surface is limited. (3) Because the side plate 35 is provided at the edge portion of the reinforcement plate 34, the box wall member 30 excels in bending rigidity. In particular, because the side plate 35 is seamlessly formed around the entire periphery of the edge portion of the reinforcement plate 34, in the present embodiment, the metal box 31 is highly rigid, and thus the box wall member 30 is also remarkably rigid. Due to the high rigidity of the box wall member 30, the overall rigidity of the thermal insulation box 16 is improved. Moreover, the thickness of the metal reinforcement plate 34 (metal box 31) can be reduced to make the thermal insulation box 16 lighter. Furthermore, because the side plate 35 extends to the side where the thermal insulation plate 32 is provided on the reinforcement plate 34, the side surfaces of the thermal insulation plate 32 are covered with the side plate 35.In particular, because the side plate 35 is provided on the entire circumference of the edge part of the reinforcing plate 34, the entire side surfaces of the thermal insulation plate 32 are covered with the side plate 35, and thus the side surfaces of the thermal insulation plate 32 are securely protected.

[0061] In addition to the above, the thermal insulation plate 32 is easily mounted simply by embedding the thermal insulation plate 32 in the side plate 35 of the metal box 31. Furthermore, a positional deviation of the thermal insulation plate 32 with respect to the reinforcement plate 34 is securely restricted by the side plate 35.

[0062] In addition, because the reinforcement plate 34 and the side plate 35 are formed by integral molding, it is not necessary to join the reinforcement plate 34 to the side plate 35 by welding or the like, and thus the formation of the box wall member 30 becomes easier.

[0063] (4) Because the insulation reinforcement plate 33 is provided on a surface of the thermal insulation plate 32, which surface is located on the side opposite to the reinforcement plate 34, the surface of the thermal insulation plate 32, which surface is located on the side opposite to the reinforcement plate 34, is protected by the insulation reinforcement plate 33. Moreover, because the insulation reinforcement plate 33 is provided, a so-called sandwich structure is realized by sandwiching the thermal insulation plate 32, which has relatively low rigidity, between the reinforcement plate 34 and the insulation reinforcement plate 33, which have high rigidity, and thus the overall rigidity is improved.It should be noted that the insulation reinforcement plate 33 can be formed in various ways, for example, the plate 33 is formed by a plate-shaped component or is a rigid layer formed by applying a liquid plastic and then curing it.

[0064] (5) In the present embodiment, in each of the five box wall members 30a to 30e, excluding the door member 30f, a surface of the reinforcing plate 34, which surface is located on the side opposite to the thermal insulation plate 32, faces the inside of the thermal insulation box 16 and serves as the inner surface of the thermal insulation box 16. The metal reinforcing plate 34 has a higher surface hardness than the thermal insulation plate 32 made of foamed plastic and the insulation reinforcing plate 33. For this reason, even if the yarns Y wound on the godet rolls 11 to 15 hit the inner surface of the thermal insulation box 16 due to yarn breakage, or the worker hits a suction gun on the inner surface of the thermal insulation box 16 during yarn threading, the inner surface is not easily damaged.Furthermore, because the metal reinforcement plate 34 has a smooth surface, cleaning can be easily performed even when dirt, such as oil emanating from the yarns Y, and yarn scraps or dirt, adhere to the inner surface of the thermal insulation box 16. If the godet rolls 11 to 15 are significantly dirty, the rolls can be cleaned using an alkaline cleaning solution or a large amount of water. For this reason, the inner surface of the thermal insulation box 16 is preferably formed by a stainless steel plate, which is easy to clean and hardly corrodes.

[0065] Modifications of the embodiment will now be described. Components identical to those in the embodiment are denoted by the same reference numerals, and their explanations will not be repeated. 1] The structure of the box wall component 30 can be changed, for example, as follows.

[0066] While in the above embodiment, the side plate 35 is formed seamlessly along the entire circumference of the edge part of the reinforcing plate 34 of each box wall component 30, a plurality of side plates 35 may be formed periodically along the edge part of the reinforcing plate 34, as shown in Fig. 6A shown.

[0067] Furthermore, the side plate 35 may not be formed on the entire circumference of the edge portion of the reinforcing plate 34. Also in this case, in order to maintain the bending rigidity of the box wall component 30, side plates 35 are preferably provided on two parts of the edge portion of the reinforcing plate 34, which are opposite to each other in the direction parallel to the plane of the reinforcing plate 34. For example, in the Fig. 6B, at the two parts of the edge portion of the reinforcement plate 34 opposite to each other in the short side direction, that is, at two parts of the long sides of the reinforcement plate 34, two side plates 35 are provided, respectively. Also in this case, the thermal insulation plate 32 is easily mounted after being mounted merely by accommodating the thermal insulation plate 32 in the space between the two side plates 35 in an embedded manner. Moreover, the two side plates 35 restrict positional deviation of the thermal insulation plate 32 with respect to the reinforcement plate 34 in the short side direction of the reinforcement plate 34.

[0068] In addition to the above, Fig. 2 among the six box wall parts 30, three box wall components 30, ie, the left wall component 30c, the right wall component 30d and the rear wall component 30e, are arranged such that a side portion of a part of each component touches the upper wall component 30a and the lower wall component 30b. At such a side portion, the thermal insulation plate 32 does not need to be specially covered with the side plate 35. In other words, in the case of the Fig. 2 shown thermal insulation box 16 which in Fig. 6B is particularly suitable for the three box wall components 30, ie, the left wall component 30c, the right wall component 30d and the rear wall component 30e.

[0069] In addition, as in Fig. 6C, the side plate 35 may extend from the reinforcement plate 34 to the side opposite the side where the thermal insulation plate 32 is provided. In addition, as shown in Fig. 6D, ribs 39 may be provided to connect the opposite corners of the reinforcing plate 34 to improve the torsional rigidity of the reinforcing plate 34 (metal box 31). Fig. 6D, four thermal insulation plates 32 are accommodated in four spaces divided by two ribs 39 in the metal box 31.

[0070] In addition to the above, while in the above embodiment, the reinforcement plate 34 and the side plate 35 are integrally formed by press-molding a single metal plate, the reinforcement plate 34 and the side plate 35 can be formed by bending a single metal plate and welding the four corners as required. Alternatively, a side plate 35, which is a plate other than the reinforcement plate 34, can be connected to the reinforcement plate 34 using a screw, by welding, or the like.

[0071] In addition, as in Fig. For example, as shown in Fig. 6E, the side plate 35 may not be provided at the edge portion of the reinforcement plate 34, and the thermal insulation plate 32 may simply be provided on the reinforcement plate 34. In this case, in order to prevent the thermal insulation plate 32 from deviating positionally with respect to the reinforcement plate 34, the thermal insulation plate 32 is preferably fixed to the reinforcement plate 34 using an adhesive, a screw, or the like.

[0072] 2] While in the above embodiment, the reinforcing plate 33 is provided on the surface of the thermal insulation plate 32, which surface is located on the side opposite to the reinforcing plate 34, as shown in Fig. 3 and Fig. 4, this insulation reinforcement plate 33 can be omitted.

[0073] [3] In the above embodiment, in the five box wall members 30a to 30e, excluding the door member 30f, the surface of the reinforcement plate 34, which is located on the side opposite to the thermal insulation plate 32, faces the interior of the thermal insulation box 16, whereas in the door member 30f, the reinforcement plate 34 is provided on the exterior of the thermal insulation plate 32. In this regard, the position (direction) of each box wall member 30 is not particularly limited. For example, in all the box wall members 30 including the door member 30f, the reinforcement plate 34 may face inward.

[0074] Alternatively, in the box wall components 30, excluding the door component 30f, the reinforcement plate 34 may also be provided on the outer side of the thermal insulation plate 32. Particularly, when a structure is attached to a box wall component 30, it is preferable for this box wall component 30 that the reinforcement plate 34 be provided on the other side of the thermal insulation plate 32 in order to position the outer side of the thermal insulation plate 32 so as to have sufficient strength for attaching a component thereto, and in some cases, to prevent the thermal insulation plate 32 made of a soft foamed resin from being exposed to the outside.

[0075] 4] The heating rollers accommodated in the thermal insulation box 16 can be arranged in various ways. For example, the heating rollers can be arranged as described in the above JP 2012-214913 A. That is, as shown in Fig. As shown in Figure 7, the thermal insulation box 46 houses a godet roll 43, which is a heating roll with an internal heater 42 therein, and a separate roll 44, which is a non-heating roll. Yarns Y introduced through a yarn inlet 46a of the thermal insulation box 46 are wound more than once between the godet roll 43 and the separate roll 44. The yarns Y heated due to contact with the godet roll 43 are sent to the downstream side through a yarn outlet 46b of the thermal insulation box 46.

[0076] [5] In the above embodiment, all six box wall members 30 constituting the thermal insulation box 16 are arranged to include the metal box 31 formed by the metal reinforcement plate 34 and the side plate 35, and the thermal insulation plate 32 made of foamed resin. Alternatively, at least one of the six box wall members 30 may be configured differently from the above. For example, among the six box wall members 30, five box wall members 30a to 30f, excluding a door member 30f, are configured by sandwiching a reinforcement plate 34 and a thermal insulation plate 32. The door member 30f, which must perform a function in addition to thermal insulation (e.g., operability by a worker), may be configured differently, with an emphasis on weight reduction or the like.

Claims

[1] Thermal insulation box (16) which accommodates a yarn heating roller for heating a yarn (Y), wherein each of the box wall components (30) forming the thermal insulation box (16) has a thermal insulation panel (32) and a reinforcement panel (34) which is made of metal and is provided on the thermal insulation panel (32), where an insulation reinforcement plate (33) is provided on a surface of the thermal insulation plate (32), which surface is located on one side opposite the reinforcement plate (34), the box wall components (30) have a door component (30f), in the case of the box wall components (30a, 30b, 30c, 30d, 30e), except for the door component (30f), a surface of the reinforcement plate (34) which is arranged on one side opposite the thermal insulation plate (32) functions as each inner surface of the thermal insulation box (16), and in the door component (30f), the reinforcement plate (34) is located on the outside of the thermal insulation plate (32). [2] Thermal insulation box (16) according to claim 1, wherein in each of the box wall components (30) the metal reinforcement plate (34) is provided only on either an inner surface of the thermal insulation plate (32), which faces the interior of the thermal insulation box (16), or on an outer surface of the thermal insulation plate (32), which faces the exterior of the thermal insulation box (16). [3] Thermal insulation box (16) according to claim 1 or 2, wherein the thermal insulation plate (32) is made of foamed plastic. [4] Thermal insulation box (16) according to one of claims 1 to 3, in which a side plate (35) made of metal is provided on an edge part of the reinforcement plate (34) such that it extends from the edge part in a direction orthogonal to the reinforcement plate (34). [5] Thermal insulation box (16) according to claim 4, wherein the reinforcement plate (34) and the side plate (35) are formed by one-piece molding. [6] Thermal insulation box (16) according to claim 4 or 5, wherein the side plate (35) extends from the reinforcement plate (34) to a side on which the thermal insulation plate (32) is provided. [7] Thermal insulation box (16) according to claim 6, wherein the side plate (35) is provided on at least each of the two parts of the edge part of the reinforcement plate (34), which parts are opposite each other in a direction parallel to the plane of the reinforcement plate (34), and the thermal insulation plate (32) is accommodated in a space between the side plates (35) and is provided on the reinforcement plate (34). [8] Thermal insulation box (16) according to claim 7, wherein the side plate (35) is seamlessly formed along the entire circumference of the edge portion of the reinforcement plate (34) such that a metal box (31) is formed by the reinforcement plate (34) and the side plate (35), and the thermal insulation plate (32) is contained in a space in the metal box (31) and is provided on the reinforcement plate (34). [9] Thermal insulation box (16) according to one of claims 1 to 8, wherein in at least one of the box wall components (30) a surface of the reinforcement plate (34), which surface is located on one side opposite the thermal insulation plate (32), faces the interior of the thermal insulation box (16) and serves as an interior surface of the thermal insulation box (16). [10] Thermal insulation box (16) according to claim 8, in which an insulating layer (38) is provided on the outer surface of the metal box (31) in the door component (30f). [11] Method for manufacturing a thermal insulation box (16) which accommodates a yarn heating roller for heating yarns, according to any one of claims 1 to 10 comprising: a construction step for connecting several reinforcement plates (34) together, and a box wall component formation step (30) for forming box wall components (30) that form a thermal insulation box (16) by providing thermal insulation panels (32) on the corresponding reinforcement panels (34). [12] Method according to claim 11, further comprising: a metal box formation step for seamlessly providing a side plate (35) extending in one direction orthogonal to the reinforcement plate around the entire perimeter of an edge portion of the reinforcement plate to form a metal box (31) formed by the reinforcement plate (34) and the side plate (35), in the assembly step metal boxes (31) which were each trained in the metal box training step are connected to each other. [13] Method according to claim 12, wherein in the box wall component formation step (30) the thermal insulation plate (32) is received in a space in the metal box (31) and is provided on the reinforcement plate (34).

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