JPS60135219A - Preparation of heat insulating cover and mold for forming the same - Google Patents

Abstract

PURPOSE:To enable adaptation to multiple-kind and small quantity production, by injecting a foam forming stock material into the inner surface side of a skin material and contacting the outer surface of the skin material with a heating or cooling medium. CONSTITUTION:A skin material 3 is convered with an upper mold 10 after received a foam forming stock material 2a. Thereafter, a heating medium 12 such as hot water is poured in a lower mold 6 from an inflow port 6b by operating a pressure tank 7 and valves 8, 9. The heating medium 12 flowed into the lower mold 6 is directly contacted with the outer surface of the skin material 3 in the opening parts 6a thereof, and the skin material 3 and the foam forming stock material 2a present inside the skin material 3 are heated to a predetermined temp. while the pressure in the lower mold 6 is made same to the foaming pressure inside the skin material 3 to prevent the deformation of the skin material 3 and good foaming reaction of the foam forming stock material 2a is promoted to form a foam. By this method, a heat insulating cover, wherein the foam 2 is integrated with the skin material, is formed. Because the lower mold may be a common one, multiple-kind and small quantity production is adapted in the same line.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a heat insulating cover and a mold used for manufacturing the same.

(Description of Prior Art) As shown in Fig. 1, the heat insulating cover is attached to cover the circumference of the pipe 1 for the purpose of keeping the pipe 1, through which fluid passes, warm or cool. Foam such as polyurethane foam covering the periphery of 2.21. and a skin material 6 such as a soft vinyl chloride resin sheet covering the outer periphery of the foam 2.2', which allows the pipe 1 to be inserted into the internal nitrogen cavity through an opening a formed in the longitudinal direction. be.

The conventional manufacturing method for such a heat insulating cover is the second method.
As shown in the figure, on the cavity surface of the molded kawashita 4, which has a cavity of a shape corresponding to the outer shape of the heat insulating cover opened 180 degrees from the opening a in FIG. 1,
The skin material 6 is set, and then the foam-forming raw material 2a is injected into the inside of the skin material 6, and then the lower mold 4 is covered with the upper mold 5, and the foam-forming raw material 2a is placed inside the mold.
By completing the foaming process, the heat insulating cover shown in FIG. 6 was obtained. However, insulation covers come in various sizes and shapes, and the conventional manufacturing method, which requires a casting mold for each type of insulation cover, is not suitable for high-mix, low-volume production. In addition, heat insulating covers having a three-dimensional curved surface such as a 5-shape or a 7-shape have a problem in that the manufacturing cost of the mold increases. Furthermore, in order to perform the foaming reaction of the foam-forming raw material well, it is necessary to heat the foam-forming raw material to a predetermined temperature, and as a means for doing so,
The molding mold is heated in a heating furnace, or the cavity surface is heated by passing a heating medium of hot water inside the molding mold, but in both cases, the foam is heated through the cast iron forming the cavity surface. Since it heats the raw material to be produced, it has poor thermal efficiency, and if it is necessary to cool it to a predetermined temperature when removing the heat insulating cover from the mold, heating and cooling are repeated. However, it also has the problem that it takes a long time to reach a predetermined temperature and the molding cycle becomes longer.

(Object of the Invention) The present invention has been made in view of the above points, and provides a method for manufacturing a heat insulating cover, which is suitable for high-mix, low-volume production, and has the advantages of low manufacturing cost and short molding cycle.
The purpose is to provide molds for use in its production.

(Structure of the Invention) The present invention provides a foam body having a cavity for piping insertion therein;
This is a rational manufacturing method for a heat insulating cover which is made up of a covering material surrounding this foam and has an opening for inserting piping into the cavity, and a mold for molding the same, and its summary. However, in the manufacturing method, the heat insulating cover is supported around and at the center of the skin material, which is formed into approximately the same shape as the skin material when it is opened 180 degrees from the opening for inserting the pipe.

When foam-forming raw materials are injected into the inner surface to form a foam, the outer surface of the skin material is brought into contact with a heating medium or a coolant to bring the skin material and the foam-forming raw material to a predetermined temperature, and the outer surface of the skin material is heated to a predetermined temperature. By adjusting the pressure of the heating medium or cooling medium present in the foam, the deformation of the skin material due to the foaming pressure of the foam forming raw material is prevented. It consists of a lower mold that supports the upper mold and an upper mold that covers the upper mold, and the lower mold is provided with a heating medium or refrigerant inlet.

The structure is such that the heating medium or cooling medium that has flowed into the lower mold can come into direct contact with the outer surface of the skin material.

The present invention will be specifically described below with reference to the accompanying drawings.

Figure M4 is a cross-sectional view when the skin material 6 is set in the lower mold 6 of the mold. The skin material 6 is made of a thermoplastic synthetic resin sheet such as soft vinyl chloride resin, and the insulation cover, which is a product, is used as an opening for inserting piping. 7180'' is pre-molded into the shape of the skin material 6 in the open state, that is, the state shown in FIG. A heat medium or coolant inlet 6b is formed in the opening 6a and the side, and a holding rod 6C is provided on the cuticle of the epidermis on the bottom, and the box is shaped like a box. Alternatively, a pressurized tank 7 that controls the flow rate and pressure of the refrigerant, a pulp 8.9, etc. are connected, and the lower mold 6
The structure is such that the skin material 6 set in the mold 6 and the refrigerant flowing into the lower mold 6 from the inlet 6b are in direct contact at the opening 6a. The upper mold 10 has a protrusion 1°a having a semicircular cross section formed on its lower surface, and covers the skin material 6. The shape of the protrusion 10a is determined depending on the shape of the pipe to which the heat insulating cover is attached. Reference numeral 11 denotes a sealing material made of an elastic material, which seals the outer skin material 6 and the lower part m6 at J'Fd green of the opening 6a.

FIG. 5 is a cross-sectional view when the foam forming raw material 2a is injected. The foam forming raw material 2a such as polyurethane foam is
After the skin material 6 is set in the lower mold 6 of the mold, it is injected into the inner surface of the skin material 3.

At that time, the center part of the skin material 3 rests on the support rod 6c,
Further, the lower mold 6 is placed in a state in which its periphery is supported by the periphery of the opening 6a of the lower mold 6, and the outer surface of the skin material at the portion where the foam forming raw material 2a is injected is exposed in the lower m6 at the opening 6a. is set to .

FIG. 6 is a cross-sectional view showing the foaming reaction when the foam forming raw material 2a<7). The skin material 6 is covered with an upper mold 10 after the foam forming raw material 2a is injected.

After this, the heat medium 12 such as seawater is introduced into the lower mold 6 through the inlet 61.
), it is injected by operating the pressurized tank 7 and pulp 8.9. The temperature and pressure of the heating medium 12 vary depending on the shape of the product, the composition of the foam forming raw material 2a, etc., and it is necessary to appropriately set the best conditions. The hot wire 12 flowing into the lower mold 6 comes into direct contact with the outer surface of the skin material 6 at the opening 6a, heats the foam forming raw material 2a present inside the skin material 6 and the skin material B to a predetermined temperature, and The pressure inside the mold 6 is made equal to the foaming pressure inside the skin material 3 to prevent deformation of the skin material 6 and promote a good foaming reaction of the foam forming raw material 2a to form a foam.

By forming the foam, a heat insulating cover in which the foam 2 and the skin material 6 are integrated is formed in the mold as shown in FIG. After this, the heat insulating cover is removed from the mold, but if cooling is required to facilitate removal from the mold, the temperature of the heating medium 12 must be lowered, or a refrigerant may be used instead of #l medium for molding. Flow into the mold is made.

(Effects) As described above, the present invention is applicable to the production of a heat insulating cover in which a foam having a cavity inside is covered with a skin material and an opening that allows piping to be inserted into the cavity is opened. The skin material, which is opened 180 degrees from the mouth, is supported at its center and its periphery, and after the foam-forming raw material is injected into the inside of the skin material, the skin material is covered, and the outer surface of the skin material is heated or cooled. The foam forming raw material and the skin material are brought into contact with each other to a predetermined temperature, and the foaming pressure inside the skin material and the pressure on the outside are made the same by controlling the pressure of the hot wire or refrigerant. The mold supports the skin material at the periphery and center of the surface material, allows the P) medium or refrigerant to flow into the inside, and has a lower mold structure in which the outer surface of the skin material is in direct contact with the heating medium or refrigerant. It consists of an upper mold that covers the skin material.

Therefore, according to the manufacturing method of the present invention, insulation covers of different shapes and types can be manufactured by replacing the skin material and the upper mold, and since the lower mold can be of the same type, a wide variety of products can be manufactured on the same line. It is suitable for small-scale production, and the manufacturing cost of the molding mold is also low. Furthermore, since heating and cooling of the foam forming raw material and the skin material are carried out by bringing the skin material into direct contact with a heating medium or a cooling medium, it has the advantage of excellent thermal efficiency and short temperature response time.

[Brief explanation of the drawing]

Figures 1 and 6 are perspective views of the insulation cover, 2nd U! ! !
4 is a sectional view showing a conventional manufacturing method, and FIGS. 4 to 6 are sectional views illustrating the present invention. 2.21... Foam, 2a... Foam forming raw material 6.
...Skin material, 6.. Lower mold of mold, 6a.. Opening, 6b.. Inflow port, 60.. Support rod, 7.. Pressure tank, 8.9..・Valve, 10... Upper mold, 10
a...Protrusion, 11...Sealing material, a...Opening,
b...Cavity patent applicant Inoue MCP Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) In manufacturing a heat insulating cover that covers a foam body with a protrusion inside with a skin material and has an opening that allows piping to be inserted into the cavity, the heat insulating cover is placed 180' from the opening.
Supporting the skin material in an open state at its center and its periphery, injecting the foam-forming raw material into the inner surface of the skin material, then shoring the skin material, and bringing the outer surface of the skin material into contact with a heating medium or a cooling medium. The foam forming raw material and the skin material are kept at a predetermined temperature, and the foaming pressure inside the skin material and the pressure outside the skin material are made the same by controlling the pressure of a heating medium or a refrigerant. How to manufacture the cover. (2) Consisting of an upper mold and a lower mold, the lower mold supports the periphery and center of the skin material constituting the heat insulating cover at its upper part, and has a flow path at a predetermined position that allows a heating medium or a refrigerant to flow into the inside. 1. A molding scoop for a heat insulating cover, characterized in that it has an inlet and has a structure in which the outer surface of the skin material and a heating medium or a cooling medium are in direct contact with each other in the lower mold.