JPS58136421A - Forming method of heat insulating cover made of foaming resin - Google Patents

Abstract

PURPOSE:To enable improving of quality, by a method wherein, in the formation of a cylindrical heat insulating cover for use with pipes, a mold releasing agent is applied to an inner and an outer periphery, an upper and a lower flange and further an outer cylinder are installed, and after a foaming resin is injected, it is split into 2 parts. CONSTITUTION:A mold releasing agent 37 is applied to an outer periphery of an inner cylinder 36, a mold releasing paper is wound therearound, upper and lower flanges 32 and 33 are attached, and an outer cylinder 34 is further installed to an outer periphery thereof. A foaming resin such as urethane resin is injected through resin injection holes 32A in a molder 31. After a given curing period has passed, a molded work is removed and is split into 2 or 3 parts by a saw, and a part 36 whereto the mold releasing agent is adhered is cut by a rotary cutter to bring it to a given size inner diameter. This prevents a stress concentrating part from being present, whereby a mold can be lightened, and thus, a working time can be shortened. Further, the use of the mold releasing agent facilitates the removal of a molded work. Additionally, a molding having an uniform density can be conducted, and this prevents the occurrence of deformation produced after molding and permits shortening of a curing time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding a heat insulating cover made of foamed resin. , fitting, 2
A mold consisting of a split outer casing is used, release paper or a mold release agent is used on the outside of the inner cylinder, and a braking process and finishing process on the inner diameter are performed after molding, resulting in extremely poor quality. Insulation cover [Inexpensive KII molding method for foamed resin insulating cover] Due to the effects of the recent oil crisis and the purpose of preventing pollution, liquefied petroleum gas is used as a fuel for power generation and for city gas. is widely used. As is well known, these liquefied gases are stored at low temperatures and transported in storage tanks,
Piping, etc. must be insulated (1), and these storage tanks and piping have recently become larger and larger9, and if the piping is tNK, the size of the pipe is 20ζoB, and the insulation thickness is also l~
2501111 is required. Figure 1 (a) is a sectional view, and ←) is a front view) shows an example of such a piping insulation method. In the figure, a heat insulating cover 2 is attached to the outside of the pipe 1. Thermal insulation power/(-3) is a cylinder cut in half and shaped into a # shape.Pipe 1 and insulation cover 2 are shaped into a predetermined length to facilitate handling.
#i Meji 3 is filled between the insulation ★ Par 2 comrades, and they are mutually constant. When the diameter of the pipe is large and the insulation thickness is large, the cylinder is often divided into three parts and a four-part insulation cover is used.

Foamable urethane resin is often used as a material for this heat insulating cover. Round 1 has excellent insulation performance and can be easily foamed on-site.
．． This is because it has the advantage of greatly reducing transportation costs.

Conventionally, this foamable urethane resin insulation cover is shown in Figure 2 (
Perspective view) It was molded using a molding method as shown in K. That is, in the same figure, the molded lid 11 is the female IJ1
2.Male 1113.2 consists of 14 gable plates. In the center of the female 1112, there is provided a cylindrical hollow space 12A having a diameter approximately equal to the required outer diameter of the heat insulating cover, and in the center of the male moat 13, the inner diameter of the required heat insulating cover is set. A protrusion 1113 in the shape of a cylindrical center having approximately the same outer diameter is provided in the cylindrical part. The lengths of the space 1112m and the convex w113m are both made to be one step longer than the length of the predetermined heat insulating cover. The end plate 14 is a plate having a height and width almost equal to the height and width of the female al 12.

To form a heat insulating cup <-1 using this molding 1111, proceed as follows: (1) Attach one end plate 14t to the female 11111.

■Female Ill! Attach the male lid 13.

■ How many companies do you use to tighten the female 111m and male 1113 with a tool (No. 211 does not indicate %/%)?

■ Mix and stir foamable urethane resin J[#Lt.

■ Fill the space of the female 1112 with foaming urethane resin stock solution tfI1. Shock.

■ After foaming and the prescribed curing period after foaming, separate the molded lids in the reverse order of the above and heat them into the insulation cup (-2 (No. **).
It is shown above the recess 12 of the female knife lug 12. ).

As stated above, the conventional molding method for heat insulating covers has no major drawbacks as long as the size of the heat insulating cover is small, but as the size of the heat insulating cup (-) gradually increases, the following drawbacks are observed. *'') 9- ■ When foaming the urethane resin, foaming pressure is applied to each part of the molded lid, which tends to cause wrinkle deformation, and to prevent this, it is necessary to use a thick molded WVt with high rigidity. The molded lid is expensive.

■ Each component of the mold is heavy, so it takes a lot of time to disassemble and assemble, and a large-sized crane is required, which increases equipment costs and ultimately increases the cost of the insulation cover. The cover is molded in the shape of a cylindrical half, but the density near this half surface tends to be high (11), and the thermal conductivity of that part is high11), resulting in poor insulation performance.

- As mentioned above, the can part of the molded product changes at one time, so it may become deformed after molding.

0 Deformation of the molded product can be prevented by leaving it in the mold for a long time, but this will make the rotation of the mold difficult, requiring many molding sessions, and ultimately reducing the insulation power.
(- original height t18<.

■ Rounding molding m to promote foaming is 40”-IO”CKf
Although it is desirable to heat the heating plate, each component has a large internal thickness as described above, so it has a large heat capacity, takes time to heat, and wastes a lot of heating energy.

In order to eliminate the drawbacks of the conventional molding method for a heat insulating resin cover as described above, authors have conventionally invented and proposed the following molding method. This method uses method 1a, which involves forming a cylinder into a cylindrical shape and then cutting it in half with a saw. Success! #Using a lid. In the same figure, 1
121 consists of a grooved ring-shaped upper end plate 22, a lower end plate 23, a thin cylindrical outer plate 24, an inner plate 25, etc. The outer diameter and inner diameter of the upper end plate 2 and the lower end plate 2s are respectively The outer diameter and inner diameter Kfi of the product heat insulation cover are equal, and a resin injection hole 22A is bored in the upper end plate.

The inner diameter of the outer plate 24 and the outer diameter of the inner plate 2S are cut so as to be equal to the outer diameter and inner diameter of the product heat insulation cover, respectively, but both of the edges 24A%2S
The diameter of the plate on both sides can be changed by applying a certain amount of force. Outer plate 2
4 has a tightening 7 lunge 26A'i on the outside, and a band 26 is hung on the tightening band 26.
A bolt or the like is inserted through the AK, and a band 26 is tightened thereby to prevent the outer plate 24 from deforming.

There are two 7-lunge plates 27 near the edge of the inner plate 25.
is identified, a #i & bolt etc. is inserted into the 97 lunge plate 27, and by tightening or loosening it, the diameter of the inner plate 25 becomes smaller or larger. A support jig 28 is provided inside the inner plate 25. Support jig 28
It consists of a center pipe 28A and a plurality of nine support rods 28B which are mounted on the center pipe via a bottle 1 so as to be able to rotate ten times on a plane including the axis of the center pipe. Support rod 28B
The length from the inner diameter of the Fi product insulation cover is twice the wall thickness of the inner plate 25, and has a length that is medium/larger than the nine value.

This mold is assembled as shown in Figure 3, and foamed resin such as urethane resin is injected through the 22 resin injection holes, and after a predetermined period of time, it is taken out and divided into two or more pieces to form the product insulation cover. molded.

As mentioned above, in the improved method, the density of each rounded part is extremely uniform, there is no irregular part such as halved 9 strokes during foam molding, and it is possible to obtain a product of extremely good quality. It is possible to greatly increase the conversion rate of deaf people with less curing time. Since there is no part where stress is concentrated due to foaming pressure, each part of the mold can be made lightweight, making it easy to handle), improving product quality and reducing cost.

However, even with this education and dismissal method from 1k onwards, I still cannot escape the following disadvantages.

■ When the product insulation cover is large, a large number of tightening bands are required, and it takes a lot of man-hours to attach and detach them.

■ To adjust the diameter of the inner plate 25, use the flange plate 27t.
This is done many times by tightening or loosening it by turning it.

(2) When the heat insulating cover is large, the support rods 28B of 8 support jigs are required, and the number of support rods 28B required is equivalent to KFi, and the attachment and detachment thereof requires a lot of man-hours.

■ In short, the cost of the heat insulating cover cannot be reduced sufficiently.

The object of the present invention is to overcome the above-mentioned drawbacks of the conventional molding method for a foamed resin heat insulating cover, and to provide a molding method capable of molding a foamed resin heat insulating cover at a sufficiently low cost.

The present invention solves the problem that in the conventional improvement method, a large number of man-hours are consumed for attaching and detaching the support jig. To remove the product, use a release agent first and release paper.
KL to be further finished, the front outer plate K is replaced with 2
The above objective is achieved by using mt outside of p.

Embodiments of the present invention will be described below based on the drawings. FIG. 4 is a diagram showing a molding process used in the method for molding a foamed resin heat insulating cover according to the present invention, and U) is a plan view (B) is a sectional view. In the same figure, a mold 31 includes seven ring-shaped upper flange 32, seven lower flange 33 of the same shape, an outer cylinder 34, an inner cylinder 35, and the like. The outer diameter of the upper and lower 7 langes 32 and 33 is the same as the outer diameter of the product insulation cover, but the inner diameter is smaller than the inner diameter of the product insulation cover by a predetermined dimension. Flange 32KF
i A resin injection hole 32A is provided.

Outer Cylinder 34Fi Product A cylinder with an inner diameter that is approximately equal to the outer diameter of the heat insulation cover. Each #i has 7 tightening langes 34A on the outside of the split surface. Inner cylinder 35Fi The inner diameter dimension of the upper and lower 7 lunges is t! Only circles with the same outer diameter are larger.

Upper and lower s7 tsunji 3! , 33, a #i milling fixture 36 is attached near the inner diameter of each - mark. ) are perforated. A plurality of holes 35A are drilled near the upper and lower ends of the front inner $135 (indicated by the center line in Figure (B)), and the holes 35A and 36A are connected with bolts, etc. (not shown). If it penetrates at point a, then K, therefore, the inner cylinder 35
The upper and lower 7 langes 32 and 33 are removably rotated.

The tightening 7 flange 34AK of the outer cylinder has a plurality of tightening holes 34B drilled therein, which are shown by the center line in the figure (A).

), the pair of outer cylinders 34 are attached to the outer periphery of the upper and lower 7 langes by pushing bolts or other tubes through the holes 34B and tightening them.

Next, the procedure for molding a heat insulating cover made of foamed resin using this molding fli31 was explained at 81400 am outside.

For products with product dimensions of 1000 mm in diameter and 100011 m in length, cotton 5, 6, 7 0) ~
This will be explained using an example in (e). FIG. 5 is a perspective view showing the finished dimensions of the product heat insulating cover 2. As shown in FIG. i The round bottom procedure is as follows.

(g) Inner Wlsso outer periphery Kmli agent 37 t*J)
, 11 papers 37 (see Figure 6) I! Kirikaru・
(Cylinder 35, upper 7 flange 32, lower flange 33
Install. Installation is done using the mounting tool 36 and hole 3 as described above.
6A, 35A'i is used, and the bolt is passed through the pipe.

(C) Attach the outer cylinder 34 to the outer periphery of the upper and lower 11s7 langes 32 and 33. For installation, as described above, tighten 7. Insert bolts etc. into the holes 348 of the flange 34A and attach the inner and outer cylinders 34.
This is done by tightening.

The assembly of the molded IN 131 is thus completed, and the situation during assembly is as shown in FIG. 6. Here, the inner diameter of the outer cylinder 34 is the same as the outer diameter dimension of the product insulation cover 2, Kl, 4001
Although it is 1 m long, the outer diameter of the inner cylinder 35 is 1,000 sam inside the product insulation cover, so 9 is also 20 III m smaller than 98.
0mm [has become].

(d) Molding foamed resin such as urethane resin! 1131
The resin is injected from the resin injection hole 32A.

(-) After the specified foaming and curing period, the mold 81t
- Disassemble and remove the molded product. At that time, the molded product 2 has the shape and dimensions as shown in FIG. 7B). That is, outside I
I is L400mm% and inner diameter 16.980mm.

ψ Using the saw force, cut 19 into 2 parts into 3 or more parts (in the case shown, it is cut into 2 parts). (See Figures 7(b) and e→) (2) As shown in Figure 7(c), the molded product 2 at this stage has the part 37 containing the outbuilding paper or mold release agent 1 attached to its inner diameter. In No. 11, the performance is affected, so the inner diameter is adjusted to the required size (LOOOm in the case of jin) using a rotating blade, etc.
mφ) (see Figure 7) and (E))
C Through the above steps, the foamed resin insulation cover 2 is completed. In this explanation, the case where urethane resin is mainly used as the foamed resin is explained, but it goes without saying that the present invention can be effectively carried out even when other foamed resin pipes are used. Although the cylinder is used vertically with its axis tm perpendicular, the present invention can also be effectively implemented when used horizontally. In this case, the resin injection hole must be provided in a part of both the seven flange 32, 33 or in the outer cylinder 34.

Furthermore, in the above explanation, the upper and lower flanges 32, 33 and the outer cylinder 34 are separate;
The present invention can also be effectively implemented in the case where each 3t is divided into two parts, which are fixed to a set of outer cylinders 34 and tightened by the tightening 7 langes 34A. By doing so, the rigidity of the outer cylinder 34 increases, which is particularly effective when molding large-sized heat insulating covers.Each part of the mold used in item 4 of the present invention has no stress concentration area due to foaming pressure. Since it can be made relatively lightweight, it is extremely easy to handle.

Since there is no need for a supporting jig or the like for the nine inner uK, the time required for disassembly and assembly is extremely short, and the mold can be manufactured at an extremely low cost. Furthermore, since the mold parts are lightweight, there is no need for large cranes, and equipment costs are low.
It is possible to reduce product costs.

Separation of the inner cylinder and product is extremely easy because release paper or a release agent reservoir is used.

If you taper the inner cylinder as necessary, the separation will be even better! It's easy. Since the inner diameter of the product insulation cover after separation from the molding board is finished using a rotating knife, there is no need to worry about deterioration in insulation performance due to the effects of mold release agent or release paper.

Furthermore, in the molding method according to the present invention, since there are no irregularly shaped parts as described above, each part of the heat insulating cover can be molded with extremely uniform density, and the quality of the molded product is extremely good. Since the amount of heat is small, the curing time after molding can be shortened, and the rotational speed of the mold can be greatly increased, making it possible to reduce the cost of the product.

Also, depending on the nature of the foamed resin, preheating or heating may be required during molding, but since each part of the mold is thin, the heat capacity is small, heating time is short, and energy is not wasted.

In summary, the present invention improves the quality of the insulation cover made of foamed wood WiI, and also makes it possible to significantly reduce the cost.
It can be said that the contribution to the stable supply of energy in Japan during the oil crisis is extremely significant.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an example of a piping insulation method, where 0) is a cross-sectional view, (b) is a front view, and Figure 2 is a molded W used to mold a heat insulating cover of foamable urethane resin. A wet perspective view, Figure 3 is a molded AI of the conventionally used modified 111M.
In the figures shown, (a) is a plan view, (b) is a cross-sectional view, and FIG. 185 is a perspective view showing an example of the product dimensions of the heat insulating cover, FIG.
FIGS. 0) to (e) are explanatory diagrams showing the process order of the method for molding a foam-resin heat insulating cover according to the present invention. 1... Piping, 2... Heat insulation cover, 3... Fist/Meji, 11... Molding mold, 12... Kai/Female mold, 13...
Φ... Male type, 14... Fist... End plate, 21... Molding mold, 22... Upper end plate, 23-... Lower end plate, 24...
... Outer plate, 25... Inner side plate, 26... Band for tightening, 27 Self... Flange plate, 28... Supporting jig, 31... φ warping mold, 32... ...Top flange, 32A...Fist resin injection hole, 33...Lower 7 langes, 34.Fist...Outer cylinder, 34A...Tightening 7 langes, 35...Inner cylinder, 36 ...-Fixing tool, 370
Fist...Release paper or #i release agent Patent applicant Sanshin Seinetsu Kogyo Co., Ltd. Representative Patent Attorney Tsuka Moto Daisan Department Figure 1 (A) (B)
411 Figure 5

Claims (1)

[Scope of Claims] A ring-shaped lower flange having an outer diameter that is approximately the same as the outer diameter of a cylindrical heat-insulating cover product and an inner diameter that is smaller than the inner diameter of the heat-insulating cover product by a predetermined dimension, and the lower flange A cylinder having an upper 7 flange having the same shape and having a hole for resin injection, and an inner diameter that is approximately the same as the outer diameter of the upper and lower flanges is divided into two in the plane including its axis to form a round shape. a pair of outer cylinders each having seven flange for tightening on its bifurcated surface; a cylindrical inner cylinder having an outer diameter substantially the same as the inner diameter of the upper and lower seven flange; For the upper 7 langes, use a molded product consisting of the lower 7 langes and a fitting that is attached to one side of the cylinder and detachably attached to the other, as shown in the following (g) to 0). Processor 1j
A method for molding a cylindrical heat-insulating cover made of -A foam 1lfjI. (a) Wrap a release agent P1 or release paper around the outer circumference of the inner cylinder <b> Attach the lower 7 flange and the upper flange to the inner cylinder with a mounting tool (C) Attach the outer cylinder to the outer periphery of the upper and lower 7 flange Attach and tighten by inserting a bolt etc. into the 7 lunge (d) Place the foamed resin on the top? Inject through the rank resin injection hole (-) After the specified foaming and curing period, disassemble the mold and remove the molded product (g) Cut into two or more pieces with a saw etc. ) Machining the inner diameter using a rotating knife, etc. to match the inner diameter of the product.