WO2016050192A1 - Method for manufacturing vacuum insulation panel - Google Patents

Abstract

A method for manufacturing a vacuum insulation panel, comprising the steps as follows: step one: baking a core material (1) for dehydration in an atmospheric state; step two: placing the core material (1) and a barrier film (2) into a vacuum chamber (3) for evacuation to meet the requirements of vacuum degree for making a vacuum insulation panel; step three: cladding the barrier film (2) on the surface of the core material under the condition of vacuum, and sealing the barrier film (2) by heating; and step four: taking the vacuum insulation panel out of the vacuum chamber (3) by deflating. This method sends the core material (1) after baking directly into the vacuum chamber (3) so as to expose the core material (1) and the barrier film (2) to a vacuum environment. With respect to the requirements for acquiring the same vacuum degree, the evacuation time is shortened by 20 times and the production efficiency is greatly increased.

Description

 Method for manufacturing vacuum insulation board  Technical field

 The invention relates to a method for manufacturing a vacuum insulation board, and the vacuum insulation board produced is mainly used for heat insulation of buildings, household appliances, pipes and other equipment.

Background technique

Vacuum insulation board Panel, abbreviated as VIP) is a new type of thermal insulation material made of vacuum insulation. It is composed of a high-barrier packaging material and a core material, a getter or a desiccant. In the state of encapsulating the core material, the getter or the desiccant with the encapsulating material, the principle of vacuum insulation is utilized to achieve the purpose of heat preservation and energy saving.

The physical condition of vacuum insulation is that the degree of vacuum must meet the requirements of adiabatic characteristics, that is, the internal pressure is sufficiently low to achieve the molecular flow state of gas molecular motion. That is to say, after the VIP package, how to ensure the thermal insulation characteristics, the internal vacuum is the key to the quality and service life of the product.

The VIP core material is composed of a multi-layer microporous insulation material, and it takes a long time to remove the gas inside, which is a major difficulty encountered in mass industrial production. The porous material exposed to the natural environment adsorbs the gas and moisture in the air, and the water remaining in the core material during the production of the core material, so that the water content is high. The heat transfer of water and gas molecules is greater than the heat transfer coefficient of permanent gases such as N ₂ , O ₂ , CO _{2 ,} etc. Therefore, excessive water will cause a decrease in thermal insulation performance, difficulty in pumping, and even change the characteristics of the core material until the function fails. One of the most important factors influencing VIP products. VIP outer coated barrier film, such as: barrier film, exposed to the natural environment, the surface of the adsorption of permanent gases and condensable gases, typically such as water, VIP gas pressure will destroy the vacuum insulation effect, which is also The main factors directly affecting VIP quality and longevity.

Most of the existing vacuum insulation panels are produced by vacuum evacuation of bags, and the specific methods are as follows:

Step 1: Use a bag making machine to make a size-obtaining barrier bag, seal the three sides, and leave one side without sealing;

Step 2: in the state of the atmosphere, the core material is cut, after sufficient baking and dehydration, the water content of the core material must be less than 1%;

Step 3: Place the getter in the baked core material, install it in the barrier bag in step 1, and then put it into the vacuum chamber. After a long period of pumping, it will block after reaching the vacuum requirement. Bag heat sealing;

Step 4: Take the VIP out of the vacuum chamber by deflation.

This method has the following problems:

1. Baking and dehydration takes 120min to 180min, but the moisture in the core material cannot be sufficiently dried, and still contains residual moisture sufficient to affect the quality of VIP;

2. In step 3, after the baked core material is bagged and the getter is placed, the surface temperature of the core material is lowered before being loaded into the vacuum chamber, and there is a risk of secondary adsorption of water;

3. In step three, as the pressure changes, the airflow of the pocket is gradually reduced, and the pumping time is as long as 40. Above min, it is difficult to increase production efficiency;

4. The barrier bag in the first step is usually made of a barrier film of a polymer polyester material, and the gas and moisture adsorbed on the inner surface of the barrier bag are difficult to be removed in a vacuum, and will be desorbed after being encapsulated in the bag mouth. Destroying the vacuum inside the VIP, increasing the thermal conductivity of the VIP and shortening its service life.

Based on the above factors, it can be seen that in the mass production of VIP, the vacuum exhaust method is the key to guarantee the quality of the product, and also the key to improving the production capacity of the entire production line. It is also the core technology for realizing the intelligent automatic production line. Therefore, the inventors further studied this and developed a new method for manufacturing a vacuum insulation panel.

Summary of the invention

The object of the present invention is to provide a method for manufacturing a vacuum insulation panel, which not only can improve the product quality of the vacuum insulation panel, but also can improve the production capacity of the entire production line and realize intelligent automatic water production.

In order to achieve the above object, the technical solution of the present invention is as follows:

A method for manufacturing vacuum insulation board:

Step 1: Baking and dehydrating the core material in an atmospheric state;

Step 2: placing the core material and the barrier film in a vacuum chamber to evacuate and further remove residual moisture to meet the requirement of vacuum degree for manufacturing the vacuum insulation panel;

Step 3: under vacuum conditions, the barrier film is coated on the surface of the core material, and the barrier film is heat-sealed;

Step 4: Remove the vacuum insulation panel from the vacuum chamber by deflation.

Further, in the first step, the baking dehydration time is 100-180 min, and the baking dehydration temperature is 180-300 ° C.

Further, in the second step, the retention time of the barrier film in the vacuum chamber is greater than or equal to 2 min, and the retention time of the core material in the vacuum chamber is less than or equal to 10 min.

Further, a preparation area and a heat sealing area are disposed in the vacuum chamber, the core material is evacuated in the preliminary area, and the barrier film is evacuated in the preliminary area and heated to degas to achieve vacuum insulation. After the vacuum degree of the board is required, the barrier film is sealed in the heat sealing zone.

Further, the barrier film is a barrier bag made of a high barrier material, and the three sides are sealed, and one side is not sealed.

Further, the barrier film is an upper barrier film and a lower barrier film made of a high barrier material, and the core material is interposed between the upper barrier film and the lower barrier film.

Further: the barrier film is a back sealing bag made of a high barrier material, and the core material is placed in the back sealing bag.

Further, a heating pipe is disposed in the vacuum zone, and the heating pipe heats the upper barrier film and the lower barrier film.

Further, the upper barrier film, the lower barrier film and the core material respectively enter the vacuum chamber and are evacuated.

Further, the upper barrier film, the lower barrier film and the core material are not in contact with each other and enter the vacuum chamber for pumping.

Further, the core material is placed on the surface of the lower barrier membrane, and enters the vacuum chamber together with the lower barrier membrane to extract air.

The invention adopts directly feeding the baked core material into the vacuum chamber, thereby exposing the core material and the barrier film to a vacuum environment, and has the following advantages compared with the prior art:

1. Compared with the requirement of obtaining the same vacuum degree, the pumping time is shortened by 20 times, which will greatly improve the production efficiency;

2. Using the principle of vacuum dehydration, the evaporation temperature of water is reduced in the vacuum chamber, and the vacuum core material can be dried in the shortest time as long as a reasonable vacuum unit is arranged;

3. The gas and water vapor adsorbed on the surface of the barrier film are removed in a vacuum to avoid the influence of the permanent gas and the condensable gas adsorbed on the inner surface exposed to the natural environment.

DRAWINGS

Figure 1 is a schematic view of a vacuum chamber in a preferred embodiment 1 of the present invention;

Figure 2 is a schematic view of a high barrier enamel film in a preferred embodiment 1 of the present invention;

Figure 3 is a schematic view of a high barrier enamel film in a preferred embodiment 2 of the present invention;

Figure 4 is a schematic view of a high barrier enamel film in a preferred embodiment 3 of the present invention;

Figure 5 is a schematic view of a vacuum chamber in a preferred embodiment 4 of the present invention;

Figure 6 is a graph of the test experiment of the present invention.

detailed description

The present invention will be further described in detail below with reference to the specific embodiments of the invention.

Embodiment 1:

As shown in FIG. 1 and FIG. 2, a method for manufacturing a vacuum insulation panel,

Step 1: In the state of the atmosphere, the core material 1 is cut and subjected to baking dehydration to remove the moisture remaining in the core material 1. Since the new manufacturing process of the present invention is employed, it is not necessary to strictly control the water content of the core material 1 after baking as in the prior art to be less than 1%. In this embodiment, the baking time is 120 min, the baking temperature is 240 ° C, the baking time is too long, the excessive temperature will consume a large amount of energy, increase the cost, the baking time is too short, the temperature is too low, and the baking is performed. The baking dehydration effect is poor, affecting the subsequent steps.

Step 2: The core material 1 and the barrier film 2 are placed in the vacuum chamber 3 to evacuate, and the moisture and gas adsorbed on the surface of the core material 1 and the barrier film 2 are further desorbed and analyzed until the vacuum degree of the vacuum insulation panel is reached. In the present embodiment, the high barrier film 2 is divided into an upper barrier film 21 and a lower barrier film 22, and the upper barrier film 21, the lower barrier film 22, and the core material 1 are placed in contact with each other. Said in the vacuum chamber 3. The preliminary area 31 and the heat sealing area 32 are disposed in the vacuum chamber 3, and the core material 1 can be evacuated in all directions of the core material 1 when the preliminary area 31 is evacuated, and the bag is opened in comparison with the prior art. The vacuum is greatly increased, the pumping time is saved, the production time is reduced, and the production cost is reduced. Similarly, the upper barrier film 21 and the lower barrier film 22 are evacuated in the preliminary region, and the gas and moisture adsorbed on the surfaces of the upper barrier film 21 and the lower barrier film 22 are removed in a vacuum to avoid exposure to the natural environment. Permanent gas and condensable gas adsorbed on the surface. In the present embodiment, the heating pipe 33 is disposed in the preliminary zone 31, and the upper barrier film 21 and the lower barrier film 22 are heated by the heating pipe 33 to more quickly remove the water adsorbed on the surfaces of the upper barrier film 21 and the lower barrier film 22. Gas and gas.

The residence time of the upper barrier membrane 21 and the lower barrier membrane 22 in the vacuum chamber 3 is greater than or equal to 2 min. If the residence time is less than 2 min, the gas and moisture adsorbed on the surfaces of the upper barrier membrane 21 and the lower barrier membrane 22 cannot be sufficiently pumped. except. The core material 1 has a residence time in the vacuum chamber 3 of less than or equal to 10 min. Of course, the length of the retention time will be determined according to the material of the core material.

Step 3: The core material 1 is placed between the upper barrier film 21 and the lower barrier film 22, and the upper barrier film 21 and the lower barrier film are thermally sealed 22 in the heat sealing portion 32 of the vacuum chamber 3.

Step 4: The vacuum insulation panel is taken out of the vacuum chamber 3 by deflation.

Test experiment:

Referring to Fig. 6, the experiment mainly tests the change of the core material outside the aluminum bag and the core material in the aluminum bag as the pumping time changes. The length and width of the aluminum bag are 450mm and 360mm, respectively, and the length, width and height of the core material are 300mm, 300mm and 20mm respectively. The diameter of the suction pipe is 200mm. The experimental results are shown in Figure 5. The pressure of the gas is reduced from 10 ⁵ to 10 ² . Due to the pressure of the vacuum chamber, the movement state of the gas molecules is in a turbulent or viscous flow state. The limitation is not obvious, and the pumping rate is faster. Due to the higher pressure, the gas released from the surface of the core material has less influence on the vacuum degree of the vacuum chamber. Therefore, the time of bare pumping and bagging is not much different. After pumping for a period of time, the gas molecular motion state in the vacuum chamber gradually transitions from the viscous flow to the molecular flow state, and the gas released from the surface of the core material becomes the main factor affecting the pressure of the vacuum chamber. In the state of molecular flow, the airflow of the bag mouth drops rapidly, and the pressure in the bag and the pressure in the vacuum chamber produce a large pressure difference. The pumping flow of the bagging is limited, and the pumping flow of the bare pumping is limited. .

Embodiment 2

As shown in FIG. 3, the difference between this embodiment and the first embodiment is that the barrier film 2 is a barrier bag made of a high barrier material, and the three sides are sealed, and one side is not sealed. The rest is the same as the first embodiment and will not be described again.

Embodiment 3

As shown in FIG. 4, the difference between this embodiment and the first embodiment is that the barrier film 2 is a back sealing bag made of a high barrier material, and the core material 1 is placed in a back sealing bag. The rest of the embodiment is the same as that of the first embodiment, and therefore will not be described again.

Embodiment 4

As shown in FIG. 5, the difference between this embodiment and the first embodiment is that the core material 1 is directly placed on the lower barrier film 22 and enters the vacuum chamber 3, and the rest is the same as that of the first embodiment. Therefore, it will not be repeated.

Industrial applicability

The invention adopts directly feeding the baked core material into the vacuum chamber, so that all the multi-layer core materials are exposed to the vacuum, avoiding the obstruction of the barrier film, increasing the air flow guiding, facilitating short-time exhausting, and extracting. Residual moisture, suitable for industrial mass production.

The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention by this concept should be an infringement of the scope of protection of the present invention.

Claims (10)

 A method for manufacturing a vacuum insulation panel, characterized in that: Step 1: in the state of the atmosphere, the core material is baked for the first time to dehydrate; Step 2: the core material and the barrier film are placed in a vacuum chamber for pumping, and the second dewatering is performed to meet the requirement of vacuum degree for manufacturing the vacuum insulation panel; Step 3: under vacuum conditions, the barrier film is coated on the surface of the core material, and the barrier film is heat-sealed to obtain a vacuum insulation panel. The method of manufacturing a vacuum insulation panel according to claim 1, wherein in the first step, the first dehydration time of the baking is 100-180 min, and the baking dehydration temperature is 180-300. °C. A method of manufacturing a vacuum insulation panel according to claim 1, wherein in the second step, the barrier film has a residence time in the vacuum chamber of greater than or equal to 2 minutes, and the core material is left in the vacuum chamber. The time is less than or equal to 10 minutes. A method of manufacturing a vacuum insulation panel according to claim 1, wherein a provision zone and a heat sealing zone are provided in said vacuum chamber, said core material is evacuated in said preliminary zone, said barrier film After evacuating in the preparatory zone and heating the degassing to meet the requirements for vacuuming the vacuum insulation panel, the barrier film is sealed in the heat sealing zone. The method for manufacturing a vacuum insulation panel according to claim 1 or 2 or 3 or 4, wherein the barrier film is a barrier bag made of a high barrier material, and the three sides are sealed, and one side is not sealed. A method of manufacturing a vacuum insulation panel according to claim 1 or 2 or 3 or 4, wherein the barrier film is an upper barrier film and a lower barrier film which are made of a high barrier material, and the core material is placed Between the upper barrier film and the lower barrier film. A method of manufacturing a vacuum insulation panel according to claim 1 or 2 or 3 or 4, wherein said barrier film is a back seal bag made of a high barrier material, said core material being placed on said back In the envelope. The method of manufacturing a vacuum insulation panel according to claim 6, wherein a heating pipe is disposed in the vacuum zone, and the heating pipe heats the upper barrier film and the lower barrier film. The method of manufacturing a vacuum insulation panel according to claim 6, wherein the upper barrier film, the lower barrier film and the core material are not in contact with each other and enter the vacuum chamber for pumping. The method of manufacturing a vacuum insulation panel according to claim 6, wherein the core material is placed on the surface of the lower barrier membrane, and enters the vacuum chamber together with the lower barrier membrane to evacuate .