KR20120028048A - Continuous rotary molding process and apparatus for the core of vacuum insulation panel - Google Patents

Abstract

PURPOSE: A manufacturing device and a manufacturing method of an inner core for a vacuum insulation material using a continuously rotary forming mold are provided to form a product through low pressure by eliminating air from a raw material before forming. CONSTITUTION: A manufacturing device of an inner core for a vacuum insulation material using a continuously rotary forming mold comprises a forming frame(10), a raw material storage tank(20), a multistage press(40), a forming press(50), and a core carrying device(60). The forming frame is consecutively rotated along a rotary body. A raw material is put from the raw material storage tank to the forming frame. Air contained in a core material(30) is eliminated from the core material at the multistage press, and the core material is formed. The formed core is placed on the top of the core carrying device and is carried to a cutter.

Description

Manufacturing apparatus and method for manufacturing inner core material of vacuum insulator using continuous rotary molding frame {Continuous rotary Molding process and apparatus for the core of Vacuum Insulation Panel}

The present invention relates to a process for continuously manufacturing an inner core material of an inexpensive vacuum insulation material having a higher mechanical strength than a conventional vacuum insulation inner core material and having a right-angle panel form. It is a technique related to the process of manufacturing the inner core material of the vacuum insulation material which uses the fiber mixture containing a fiber as a continuous rotational molding die.

While a general heat insulator exhibits a thermal insulation performance of 30 mW / mK, a vacuum heat insulator exhibits high performance of 3 to 10 mW / mK. Despite the high thermal insulation properties of vacuum insulators, they have not been widely used to date due to high material costs and difficult manufacturing techniques. Recently, many advances in manufacturing technology have made efforts to commercialize in countries such as Germany, the United Kingdom, Japan, the United States, Canada, Korea, China, etc., but still high material costs and manufacturing process costs are a big burden.

Vacuum insulating material is usually composed of an insulating molded body made of an inorganic material and a gas barrier film surrounding it, characterized in that the inside of the insulating molded body is made of a vacuum. The heat insulation molded body filling the inside of the vacuum insulation panel is called an inner core. There are two cases where the inner core is made of a glass fiber compact and a powder compact including silica powder. The field covered in this patent is an inner core made of a powder compact.

According to the domestic application KR 1993-0024205, the core material is weighed and put into an envelope, and the product is flattened by a press. In the press process, due to film damage, poor surface condition and poor squareness, the panel is insufficient. It is impossible to apply to the construction, etc. which is the most applied part of the insulation. In Japanese application JP 2001-116592, the core material is simply put into a mold and pressurized, which takes a lot of time in molding and causes problems in terms of productivity.

In the case of manufacturing a core material using a mold such as a conventional mold as a method of manufacturing a core material using a vacuum insulator, it is not only a time and a cost in the manufacturing process but also a result of inferior commerciality due to uneven quality. There is a need for a manufacturing process of a vacuum insulation material. In addition, the conventional bag molding method and mold molding method takes a lot of time by using a multi-step molding method to remove the air contained in the core material for forming the core material, causing a lot of problems such as cost increase due to productivity decrease It was.

Therefore, in the present invention, in order to reduce the material cost and lower the manufacturing cost than the envelope molding method or the mold (molding mold) molding method of the vacuum insulation material cores that have been used in the past, the vacuum insulation material manufacturing process is carried out using a rotary molding mold, despite being a low specific gravity molded article. Light weight, excellent strength improvement effect of the molded article, easy to mix, vacuum insulation effect and the process of continuously manufacturing the core material of the vacuum insulation material excellent in strength led to the present invention.

The present invention provides a higher mechanical strength than the conventional, low-cost inner core material of vacuum insulation and a continuous manufacturing method thereof. Through this, a cheaper and higher quality vacuum insulation panel can be obtained.

In the present invention, in order to improve the formability, a multi-stage press for removing air (containing air) of the molded body is introduced in the pre-press step.

The multi-stage press before the molding press shortens the press time and also enables the molding of the core material with low press pressure, which greatly reduces the density and saves the raw material, thereby showing the substantial cost saving effect.

In addition, in the present invention to solve the problems of the conventional vacuum insulating material manufactured by batch type, the continuous manufacturing process of the vacuum insulating material is (1) raw material preparation step, (2) raw material mixing step, (3) rotary core material forming step, ( It consists of 4) drying process, (5) lapping and packing process, and (6) vacuum treatment and finishing process. It is a continuous molding using a rotary mold when forming a vacuum insulation core material.

Through the present invention, it is possible to obtain an inner core material of a vacuum insulation material having a higher strength and having an accurate specification and a right angle shape. The manufacturing method by the continuous rotary mold does not cause the loss of raw materials during manufacturing, and also removes air in the raw materials in the pre-molding step to form the product at low pressure during molding. It can be produced, the raw material saving effect of more than about 10% was obtained, it is possible to obtain higher productivity and cost reduction effect than the core molding method using a conventional mold and the like.

1 is a flow chart of a continuous rotary manufacturing process of a vacuum insulator core material
2 is a plan view of a continuous rotary manufacturing device of the inner core material of the vacuum insulation material

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In general, the nomenclature used herein and the experimental methods described below are well known and commonly used in the art.

Continuous rotary manufacturing apparatus of the inner core material of the vacuum insulation material of the present invention is a molding mold 10, the raw material storage tank 20, the core material 30, the multi-stage press 40, the molding press 50, the core material discharging device 60 , Forward and backward conveyor 70, cutter 80, upper and lower conveyor 90, the conveying conveyor 100, the insulation core 110 is composed of, the mold 10 is continuously rotated along the rotating body The raw material is introduced into the mold 10 in the raw material storage tank 20, and after removing the air contained in the core material 30 in the multi-stage press 30, the core material is finally removed from the molding press 50. It is molded into the inner core material of the vacuum insulation material having the exact size and shape, and the molded core material is formed by raising the core material from the bottom of the core material discharging device 60, and the molded vacuum insulation material core material is completed, thereby reducing productivity and high cost. Core material completed according to the embodiment is a panel of a rectangular shape, such as for building insulation This applies to all areas that need to be available.

Vacuum insulating material core material manufacturing method of the present invention is a raw material preparation step (1), raw material mixing step (2), continuous rotary core material forming step (3), drying step (4), lapping packaging step (5), vacuum treatment and finishing It consists of a process (6).

The raw material preparation step (1) is a step of preparing a synthetic silica, organic fibers which are components of the vacuum insulation material according to the present invention.

In synthetic silica, fumed silica produced by gas phase reaction, precipitated silica produced by liquid phase reaction, colloidal silica, aerogel, and silica sol can be used. Among them, the use of fumed silica with low manufacturing cost and high specific surface area is preferable. The inner core material of the vacuum insulation panel can be manufactured only with pure synthetic silica powder, and in addition to the synthetic silica, powders such as alumina, titanium oxide, silicon carbide, and graphite can be mixed to increase thermal insulation. The preferred amount of synthetic silica in the powder mixture for the inner core is preferably 60% by weight or more.

It is more preferable that the organic fibers use fibers of a certain length rather than mixing various lengths. As for the diameter of an organic fiber, 1-100 micrometers is preferable, More preferably, the diameter of 5-40 micrometers is selected. Organic fibers such as PE, PP, Nylon, PVA, and PAN may be used as the type of organic fibers used. In order to reinforce the fiber of the inner core, it is preferable to use only organic fibers, but it is also possible to mix organic fibers with high specific gravity carbon fibers and glass fibers. Even in this case, the main reinforcing function is the organic fiber.

The content of the mixture of organic fibers is preferably 0.5 to 10 parts by weight based on 100 parts by weight of the synthetic silica-containing powder mixture. If the organic fiber content is too high, the vacuum insulation panel accelerates the change over time, thereby lowering the insulation performance.

The manufacturing process for making the inner core material of the vacuum insulation material with the synthetic silica-containing powder mixture and the organic fiber-containing fiber mixture takes several steps. Here, various manufacturing processes are possible according to the arrangement order of each step. But the result has similar properties.

Drying of the synthetic silica-containing powder mixture is preferably dried at normal temperature and pressure for the purpose of evaporating moisture.

The raw material mixing process (2) is a process of mixing synthetic silica with additives and organic fibers. The mixing is possible with the use of powder mixers such as ribbon mixers, Nida-groups, Nauta-mixers, and blade mixers.

In the continuous rotary core shaping process (3), the molding die rotates continuously along the rotating body, and the raw material is introduced into the molding die from the storage tank, and finally, the press removes the air contained in the core material in the multistage press. The core is molded into an inner core of a vacuum insulator having an accurate specification and a right angle shape, and the molded core is continuously raised to form a vacuum insulator core that is formed by lifting the core up from the lower portion of the core discharging device.

The drying step (4) is a step in which the molded inner core material is removed to remove moisture attached to the surface before packaging. The temperature is carried out continuously at 100 to 200 ° C.

Lapping packaging process (5) is a six-step wrapping (wrapping) process of the molded inner core with a film of PE, LLDPE, PP, PVC, PET, which is a shrink film.

In the vacuum treatment and finishing process (6), the core material wrapped in the wrapping and packaging process is repacked with a gas barrier film, adjusted to a vacuum state in the vacuum chamber, and then sealed to complete the vacuum insulation material.

Referring to the continuous rotation manufacturing apparatus of the vacuum insulation inner core material of Figure 2, the continuous rotation manufacturing process of the vacuum insulation core material of the present invention, the raw material of the vacuum insulation material inner core material through the raw material preparation step and the raw material mixing process is a raw material storage tank ( 20) and the raw material of the storage tank is put into the molding mold installed at the bottom of the storage tank to remove air contained in the core material 30 in the multi-stage press 40, and finally the core material in the molding press 50 It is molded into the inner core of the vacuum insulation material having the correct specification and shape. The molded core material is conveyed to the conveyor back and forth by lifting the core material from the bottom of the core material carrying device (60). In the forming mold continuously rotating according to the rotating body, a continuous rotary core molding process is performed, and then the molded core is transferred to the cutter 80 through the forward and backward conveyors 70, and the cutter is adapted to the specifications of the final molded product. After cutting, the wrapping and packaging process is passed through the upper and lower conveyor 90 and the conveying conveyor (100). After the wrapping and packaging process, the vacuum insulation core material of the present invention is manufactured according to the continuous rotational manufacturing process and apparatus of the vacuum insulation core material through a vacuum treatment and finishing process.

Hereinafter, the present invention will be described in more detail by way of examples. These examples are intended to illustrate the present invention in more detail, and it will be apparent to those skilled in the art that the scope of the present invention is not limited to these examples.

The molding time and the density of the core material according to the present invention were obtained in comparison with the prior art.

Property comparison by molding machine division Molding time (minutes) Density (g /) Conventional Envelope Method 30 0.28 Conventional Mold Method 20 0.21 Multi-stage press and forming press 2 0.18

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereby. something to do. Thus, the substantial scope of the present invention will be defined by the appended claims and their additives.

10 forming mold
20 Raw Material Storage Tank
30 Heartwood Raw Materials
40 multi-stage press
50 forming press
60 Core Material Export Device
70 forward and backward conveyor
80 cutter
90 upper and lower conveyor
100 conveying conveyor
110 Insulation Core

Claims (9)

Molding mold 10 is continuously rotated along the rotating body, the raw material is introduced into the mold 10 in the raw material storage tank 20, the air contained in the core material 30 in the multi-stage press 40 After removing the core from the molding press 50, the core is finally molded into the inner core of the vacuum insulating material having the correct size and shape, the molded core is a continuous rotary type that is conveyed to the cutter by raising the core from the bottom of the core discharging device 50 An apparatus for manufacturing a vacuum insulation inner core material using a molding die.
2. The apparatus of claim 1, wherein the core material formed by the molding press is a panel having a right angle shape.
Continuous rotary molding consisting of raw material preparation process (1), raw material mixing process (2), continuous rotary core forming process (3), drying process (4), lapping packaging process (5), vacuum treatment and finishing process (6) Method for manufacturing the inner core material of the vacuum insulation material using a mold.
4. The raw material preparation process (1) according to claim 3, characterized in that the continuous mixture comprises a powder mixture comprising synthetic silica having an average particle size of 5 to 50 nm and a fiber mixture comprising organic fibers cut to 6 to 40 mm. Method for manufacturing the inner core material of the vacuum insulation material using a rotary mold.
The raw material mixing process (2) according to claim 3, characterized in that the continuous heat-generating, characterized in that the homogeneous mixing of 0 to 30 parts by weight of the radiant heat shielding additive and 0.5 to 10 parts by weight of the organic fiber with respect to 100 parts by weight of the silica powder mixture. Method for manufacturing the inner core material of the vacuum insulation material using a molding die.
According to claim 3, the continuous rotary core molding process (3) is a molding die is continuously rotated along the rotating body, the raw material is introduced into the molding die in the storage tank, to remove the air contained in the core material in the multi-stage press After pressing, the core is finally formed into an inner core of a vacuum insulation material having a precise specification and a right angle shape, and the formed core material is continuously rotated, characterized in that the molded vacuum insulation core material is formed by raising the core material from the bottom of the core material discharging device. Method for manufacturing the inner core material of the vacuum insulation material using a molding die.
The drying process (4) according to claim 3, wherein the drying step (4) is performed to remove moisture from the molded inner core material, and the drying temperature is continuously performed at 100 to 200 ° C. Method of manufacturing core material.
According to claim 3, the wrapping and packaging process (5) is a process of lapping the molded inner core material into any one of the films of PE, LLDPE, PP, PVC, PET, which is a shrink film. Method for manufacturing the inner core material of the vacuum insulation material using a continuous rotary forming mold, characterized in that the perforated film to provide a breathable to the shrink film for a smooth vacuum in the process.
The vacuum treatment and finishing process (6) according to claim 3, wherein the core material wrapped in the wrapping and packaging process is re-packed with a gas barrier film to adjust the vacuum state in the vacuum chamber to produce a vacuum insulation material by sealing. Method for manufacturing inner core material of vacuum insulation material using a continuous rotary mold.

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