Method for improving surface stripes of vacuum insulated panel and stripe improving device

Abstract

The invention discloses a method for improving stripes on the surface of a vacuum heat insulation plate and a stripe improving device, and relates to the technical field of plate body crease resistance. Specifically, a core material to be packaged is selected, and the surface of the core material is cleaned and dedusted; conveying the core material after dust removal, and puncturing the large surface of the core material to form a plurality of needle holes in the core material; vacuumizing the air insulation bag to enable the air insulation bag to be attached to the surface of the core material to form a vacuum insulation panel; and the redundant air isolation bag on the edge of the vacuum heat insulation plate is folded, and the redundant air isolation bag is attached to the large face of the core material, so that an edge folding face is formed. A plurality of pinholes are formed in the surface of the core material, after the gas insulation film is vacuumized, the gas insulation film wraps the outer wall of the core material under the action of atmospheric pressure, the shrinkage speed of the gas insulation film is low, the excessive gas insulation film in the slow area can be gradually filled in the pinholes, and wrinkles on the surface of the vacuum insulation panel are gradually weakened until the wrinkles are eliminated due to the fact that the pinholes store the gas insulation film. And the flatness of the surface of the vacuum insulated panel is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-wrinkle of panels, and in particular to a method for improving surface stripes of vacuum insulation panels and a stripe improving device. Background Art

[0002] Vacuum insulation panel (VIP) is a high-efficiency insulation material made based on the principle of vacuum insulation. It is mainly composed of core material, barrier film and adsorbent, and has a very low thermal conductivity. This material has the advantages of thin thickness, small volume and light weight. It is mainly used in occasions that require high-efficiency insulation, such as home appliances and cold chain logistics.

[0003] The production of vacuum insulation panels is divided into the steps of feeding, core material, packaging, and modified packaging. The core material is mainly made of glass fiber. Specifically, in the packaging step, the diaphragm is placed on both sides of the core material and wraps the entire core material. The diaphragm material has insufficient tensile strength or poor ductility, which will form wrinkles during the vacuuming process. At the same time, the size of the vacuum insulation panel design also has an impact. Too large or too small size will lead to uneven stress distribution during the vacuuming process. In addition to the above cases, there are various other situations that will cause more wrinkles on the board surface after packaging. The appearance of these wrinkles will affect the appearance qualification rate of the product, and will often be produced in batches, hindering product sales and causing greater economic losses to the company.

[0004] At present, when vacuum insulation panels are produced, air barrier films are set on both sides of the core material. When the panels are packaged with the air barrier films, wrinkles on the surface of the vacuum insulation panels are difficult to avoid. When wrinkles occur, the vacuum insulation panels are placed in a vacuum environment, and the wrinkles on the surface of the vacuum insulation panels are spread toward both sides through a subsequent device to achieve a wrinkle removal effect. However, the wrinkle removal effect of this method is more troublesome, and it is necessary to inspect the vacuum insulation panels after packaging, and select vacuum insulation panels with obvious and more wrinkles, which increases the difficulty of subsequent screening. After screening, the vacuum insulation panels also need to be placed in a vacuum environment for wrinkle removal, which increases the correction steps after the vacuum insulation panels are processed, affecting the production efficiency of the product.

[0005] Therefore, the present application aims to reduce the generation of wrinkles on vacuum insulation panels before packaging the panels, while reducing the subsequent wrinkle removal steps on the vacuum insulation panels to improve production efficiency. Summary of the invention

[0006] The main purpose of the present invention is to provide a method for improving the surface stripes of a vacuum insulation panel and a stripe improvement device, aiming to reduce the generation of wrinkles on the vacuum insulation panel before packaging the vacuum insulation panel, while reducing the subsequent wrinkle removal steps of the vacuum insulation panel and improving production efficiency.

[0007] In order to achieve the above object, the present invention proposes a method for improving the surface stripes of a vacuum insulation panel, comprising the following steps:

[0008] Step S1: Select a core material to be packaged, and clean and remove dust from the surface of the core material;

[0009] Step S2: transporting the core material after ash removal, and puncturing the large surface of the core material to form a plurality of pinholes on the core material;

[0010] Step S3: the core material with pinholes is further transported and loaded into a corresponding air barrier bag;

[0011] Step S4: evacuating the air barrier bag so that the air barrier bag is attached to the surface of the core material to form a vacuum insulation panel;

[0012] Step S5: folding the redundant air barrier bags at the edge of the vacuum insulation panel, and attaching the redundant air barrier bags to the large surface of the core material to form a folded edge surface.

[0013] Furthermore, in step S2, the large surface of the core material is punctured on one or two sides.

[0014] Furthermore, in step S2, the diameter of the pinhole of the core material is 0.5 mm to 3 mm.

[0015] Furthermore, in step S2, the pinhole depth of the core material is 2 mm to 10 mm.

[0016] Furthermore, in step S2, the pinhole spacing of the core material is greater than 0.5 cm.

[0017] Furthermore, it is characterized in that, in step S2, the puncturing direction is perpendicular to the large surface of the core material.

[0018] Furthermore, in step S5, on the large surface of the core material punctured, the pinhole density at the folded edge surface is greater than the pinhole density of the remaining area.

[0019] The present application also discloses a stripe improvement device, comprising:

[0020] The plate body is provided with a puncture surface;

[0021] a puncture needle disposed on the puncture surface; and

[0022] A handle is fixed on a side of the plate body away from the puncture needle.

[0023] Furthermore, the edge of the plate body is adjustable and provided with a cutting plate, and the cutting plate can adjust the length extending from the puncture surface.

[0024] The above technical solution has the following advantages:

[0025] The present invention punctures the surface of the core material to form a plurality of pinholes on the surface of the core material. When the air barrier film is evacuated, the air barrier film is wrapped around the outer wall of the core material under the action of atmospheric pressure. The shrinkage speed of the air barrier film is slow, and the excess air barrier film in the slower area will gradually fill in the pinholes. Due to the storage of the air barrier film by the pinholes, the wrinkles on the surface of the vacuum insulation panel are gradually weakened until they are eliminated, thereby increasing the flatness of the surface of the vacuum insulation panel, improving the overall quality of the vacuum insulation panel, and meeting the requirements of customers. Before the vacuum insulation panel is packaged, the wrinkles on the surface of the vacuum insulation panel are greatly reduced, and at the same time, the subsequent wrinkle removal steps of the vacuum insulation panel are reduced, thereby improving production efficiency, reducing the unqualified rate of the vacuum insulation panel after production, and avoiding customer returns due to excessive wrinkles.

[0026] The present invention conducts multiple tests on the surface puncture diameter, depth and interval of the core material to select a range that satisfies the surface puncture of the core material, that is, to ensure that the pinholes on the surface of the core material are not easy to observe, so as to avoid the unsightly surface of the core material and affect sales. It also avoids the problem of depression on the surface of the air barrier film due to the size of the pinholes not meeting the standards, thereby reducing the unqualified rate during the production of vacuum insulation panels and meeting the overall production requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0028] Figure 1 It is a schematic diagram of the structure of the present invention from a first viewing angle;

[0029] Figure 2 It is a schematic diagram of the structure of the second viewing angle of the present invention;

[0030] Figure 3 It is a diagram showing the wrinkle structure of the core material of the present invention before and after puncture.

[0031] In the figure: 1. board body; 2. handle; 3. cutting board; 4. needle. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not constitute a limitation to the present invention.

[0033] After careful research on the wrinkle problem of vacuum insulation panels, the inventors found that the cause of the wrinkles was that the air in the barrier bag was sucked out during the vacuuming process, and the atmospheric pressure pressed the barrier bag against the surface of the core material. The smooth and flat surface of the core material caused some air to fail to overflow in time when the barrier bag was pressed against the core material, forming a cavity between the bag and the core material. The gas escape speed in the cavity could not keep up with the contraction speed of the barrier bag at other positions of the board surface, and finally a raised wrinkle would be left on the board surface after the vacuum was completed.

[0034] Because when using the vacuum insulation panel, it needs to be glued on one side and pasted to the surface of the target component. If there are many wrinkles, it will seriously affect the effect of gluing, thereby reducing the adhesion of the glued surface, and ultimately affecting the service life of the customer's product. Therefore, the wrinkle problem for the vacuum insulation panel is not simply an unsightly appearance, but will really affect its final use.

[0035] The wrinkle removal device applied by the inventor can, under a vacuum environment, spread the excess air barrier film to the edge of the vacuum insulation board, thereby eliminating the excess part of the air barrier film in the middle part of the core material. Based on this experience, it is believed that when vacuuming, the excess part of the air barrier film can be spread to both sides of the core material, but this method requires the addition of multiple complex structures, which ultimately does not make up for the gains. Considering that the wrinkled part occupies less air barrier film, it is only necessary to flatten the wrinkled part, so a plurality of holes are designed on the core material. When vacuuming, the excess air barrier film will fit into the corresponding holes, thereby eliminating excess wrinkles and taking shape under the action of atmospheric pressure. Due to the large number of holes, the multiple holes will disperse the excess air barrier film at the wrinkles, thereby reducing the wrinkles on the surface of the vacuum insulation board. At the same time, the number of holes is large and the hole diameter is small, so it is not easy to observe the uneven surface of the vacuum insulation board, thereby meeting the needs of customers.

[0036] A method for improving surface stripes of a vacuum insulation panel comprises the following steps:

[0037] Step S1: Select the core material to be packaged, and clean and remove dust from the surface of the core material; wherein, the surface of the core material is cleaned with an air gun, and a brush or a fan can also be used to clean the dust on the surface. The purpose is to remove the dust on the surface to prevent contamination during the subsequent puncture of the core material, reduce the vacuum degree of the vacuum insulation panel, and affect its insulation performance.

[0038] Step S2: The core material after dust removal is transported and the large surface of the core material is punctured to form a plurality of pinholes on the core material; the large surface of the core material is punctured to form a plurality of pinholes on its surface, and the specific pinhole settings are as follows:

[0039] In step S2, one or two sides of the core material are selected for large-surface puncture. If only one side of the core material is punctured during puncture, this can be used as an experimental reference. For example, to compare the puncture effects on both sides of the core material, after one side of the core material is punctured, if it is subsequently packaged, it can be clearly observed that fewer wrinkles appear on the pinhole side of the core material, or there are no wrinkles, and wrinkles appear on the side of the core material without pinholes, and the number of wrinkles is more than that on the side of the core material with pinholes.

[0040] If only one side of the core material is punctured during production, the core material puncture process can be saved and the complexity of the overall puncture structure can be reduced. When using this method, the unpunctured side of the core material needs to be more closely fitted with the air barrier film to minimize the amount of residual air between the unpunctured side of the core material and the air barrier film. The air in the air barrier film is squeezed between the punctured side of the core material and the air barrier film. When the air barrier film is evacuated, the air barrier film is adhered to the surface of the core material under the action of atmospheric pressure. The unpunctured side of the core material is tightly adhered to the air barrier film, so the generation of wrinkles is reduced during vacuuming. The pinholes on the surface of the core material are filled with the air barrier film, so that the air that is not discharged from the air barrier film flows into the pinholes, and the air barrier film is also filled in the pinholes, greatly reducing the generation of wrinkles.

[0041] In the present application, it is preferred to puncture both sides of the core material to produce a number of pinholes on both sides of the core material, which can further avoid the operation in which the core material and the air barrier film are tightly attached in the above operation and avoid the occurrence of wrinkles on the side of the core material that is not punctured.

[0042] In step S2, the diameter of the pinhole of the core material is 0.5mm to 3mm. In the present application, if the pinhole puncture is 0.5mm, the diameter of the puncture pinhole is smaller, which can meet the situation of a small number of wrinkles and weaken some wrinkles. At the same time, the puncture situation is not easy to observe on the surface of the core material, and the smooth effect of the core material surface and the air barrier membrane surface can be clearly observed; if the diameter of the pinhole of the core material is 2mm, the pinhole is sufficient to fill the air barrier membrane to the pinhole. At this time, the diameter of the pinhole is not enough to observe, and the surface is flat. At the same time, most of the wrinkles are eliminated, and there are no weakened wrinkles; if the diameter of the pinhole is 3mm, the diameter of the pinhole is larger, which can also meet the situation of eliminating wrinkles, but it is easy to be noticed by humans, and when the air barrier membrane is evacuated, partial depressions are likely to appear on the surface of the air barrier membrane.

[0043] In step S2, the depth of the pinhole of the core material is 2mm to 10mm. In the present application, if the depth of the pinhole of the core material is 2mm, the pinhole of the core material can accommodate the wrinkled part of the air barrier membrane, but the accommodation capacity is limited, and it is easy to form an uneven shape on the surface of the air barrier membrane; if the depth of the pinhole of the core material is 5mm, the depth of the pinhole on the surface of the core material is sufficient to accommodate the raised part of the air barrier membrane, and the overall surface is smooth and flat, which is also convenient for adjusting the depth of the pinhole; if the depth of the pinhole is 10mm, the depth of the pinhole meets the storage of the air barrier membrane. If the diameter of the pinhole is selected from 2mm to 3mm, it can greatly accommodate the redundant part of the air barrier membrane.

[0044] In step S2, the interval between the pinholes of the core material is more than 0.5 cm. If the interval between the pinholes is 0.5 cm, the distribution between the pinholes can eliminate wrinkles, and it is not easy to observe the distribution of the pinholes on the core material, which meets the factory requirements. The distribution of the pinholes can be array distribution, or X-shaped or several equidistant square distributions on the core material, so as to fully cover different positions of the core material.

[0045] In step S2, the puncture direction is perpendicular to the large surface of the core material. In order to increase the difficulty of puncture and ensure that the needle hole does not deviate after puncture, it is preferred to make the puncture direction perpendicular to the surface of the core material so that the size of the needle hole on the surface of the core material remains consistent, so as to avoid excessive concavity of the surface of the core material and affect the overall quality.

[0046] Step S3: the core material with pinholes is further transported and loaded into a corresponding air barrier bag;

[0047] Specifically, after the surface of the core material is punctured, it is moved into the air barrier bag through a conveyor roller, belt or slide rail. The air barrier bag can be set to be open at one end so that the core material falls directly into the open end of the air barrier bag, or the outer wall of the entire core material can be directly wrapped by using air barrier films on both sides.

[0048] Step S4: evacuating the air barrier bag so that the air barrier bag is attached to the surface of the core material to form a vacuum insulation panel;

[0049] Specifically, after the air barrier bag is evacuated, it sticks to the surface of the core material under the action of atmospheric pressure. After the air barrier bag shrinks, the part that has not shrunk in time is filled in the pinholes, so that the surface of the entire vacuum insulation board can be evenly spread, making its surface smoother. After the core material is punctured, the pinholes on the surface of the core material will also increase the contact area between the core material and the air barrier film, and to a certain extent, enhance the bonding force between the core material and the air barrier film, thereby improving the overall mechanical bonding performance. At the same time, because the pinholes hinder the flow path of the gas to a certain extent, the pinholes help reduce the penetration of gas through the air barrier film.

[0050] Step S5: Fold the excess air barrier bags at the edge of the vacuum insulation panel, and attach the excess air barrier bags to the large surface of the core material to form a folded edge surface. In order to improve the vacuum degree of the vacuum insulation panel, the excess air barrier film at the edge is folded, and the folded part is attached with tape to facilitate the formation of the folded edge surface.

[0051] In step S5, the density of pinholes at the folded edge on the large surface of the core material punctured is greater than the density of pinholes in the remaining area. Since the folded edge is formed by folding the excess part of the air barrier bag, and the air barrier film on the surface of the core material punctured is secondary blocked, the pinholes can be concentrated on the folded edge. Since the folded edge will be blocked by the excess air barrier bag, the wrinkle removal effect on the surface of the vacuum insulation panel can be greatly improved. At the same time, it is not easy to observe the uneven surface of the vacuum insulation panel. Because the air barrier film at the folded edge is partially concave, the excess part of the air barrier film is folded, which can further increase the fitting area, improve the tightness of the folded edge, and prevent the folded edge from falling off easily. Since the folded edge is located on the side of the core material, and the excess part of the air barrier film is spread to the edge of the core material after the air barrier film is evacuated, the pinholes at the folded edge can more widely eliminate the wrinkles on the edge of the core material, greatly improving the probability of eliminating wrinkles.

[0052] like Figure 1 and Figure 2 As shown, a stripe improvement device includes a plate body 1, a needle 4 and a handle 2. The plate body 1 is provided with a puncture surface; the needle 4 is provided on the puncture surface; and the handle 2 is fixed on the side of the plate body 1 away from the needle 4. The handle 2 is convenient for manual holding and machine grabbing, and drives the plate body 1 to rise and fall. After the plate body 1 rises and falls, the needle 4 on the puncture surface rises and falls, thereby puncturing the surface of the core material passing through, so that the surface of the core material has the required pinholes, and the above method is applicable.

[0053] like Figure 2 As shown, the edge of the plate body 1 is adjustable with a cutting plate 3, and the cutting plate 3 can adjust the length of the protruding puncture surface, wherein the cutting plate 3 is a square cutter, when the plate body 1 is lowered, the cutting plate 3 can cut the four sides of the core material to form a piece of core material suitable for production, and the needle 4 also completes the puncture of the core material; in addition, the cutting plate 3 can also be a cutter distributed on one side of the plate body 1, and the cutter is located on the plate body 1 close to the transmission direction of the core material. At this time, when the plate body 1 is lowered, the puncture and cutting of the core material can also be completed. At this time, the core material is a long strip. The installation method of the cutting plate 3 is plug-in, clip-on or bolt-tightening, which can facilitate the height adjustment of the cutting plate 3 to meet the cutting and puncture of core materials of different thicknesses and improve the adaptation effect.

[0054] Figure 3The left side is the partial structure diagram of the core material without puncture. It can be observed that at least two irregular wrinkle stripes are formed on its surface, as shown in the red circle area in the figure; the right side is the partial structure diagram of the core material after puncture. Its surface is smoother and flatter, and there is no obvious dent.

[0055] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for improving surface stripes of a vacuum insulation panel, characterized in that: The steps include: Step S1: Select a core material to be packaged, and clean and remove dust from the surface of the core material; Step S2: transporting the core material after ash removal, and puncturing the large surface of the core material to form a plurality of pinholes on the core material; Step S3: the core material with pinholes is further transported and loaded into a corresponding air barrier bag; Step S4: evacuating the air barrier bag so that the air barrier bag is attached to the surface of the core material to form a vacuum insulation panel; Step S5: folding the redundant air barrier bags at the edge of the vacuum insulation panel, and attaching the redundant air barrier bags to the large surface of the core material to form a folded edge surface.

2. The method for improving surface stripes of a vacuum insulation panel according to claim 1, characterized in that: In step S2, one or two sides of the core material are punctured.

3. The method for improving surface stripes of a vacuum insulation panel according to claim 1, characterized in that: In step S2, the diameter of the pinhole of the core material is 0.5 mm to 3 mm.

4. The method for improving surface stripes of a vacuum insulation panel according to claim 1, characterized in that: In step S2, the pinhole depth of the core material is 2 mm to 10 mm.

5. The method for improving surface stripes of a vacuum insulation panel according to claim 1, characterized in that: In step S2, the interval between the pinholes of the core material is greater than 0.5 cm.

6. The method for improving surface stripes of a vacuum insulation panel according to any one of claims 1 to 5, characterized in that: In step S2, the puncturing direction is perpendicular to the large surface of the core material.

7. The method for improving surface stripes of a vacuum insulation panel according to claim 1, characterized in that: In step S5, the pinhole density at the folded edge surface on the large surface of the core material punctured is greater than the pinhole density of the remaining area.

8. A stripe improvement device, characterized in that: include: The plate body (1) is provided with a puncture surface; A puncture needle (4) is arranged on the puncture surface; as well as A handle (2) is fixed on a side of the plate body (1) away from the puncture needle (4).

9. The stripe improvement device according to claim 8, characterized in that: The edge of the plate body (1) is adjustable and provided with a cutting plate (3), and the cutting plate (3) can adjust the length of the cutting plate (3) extending out of the puncture surface.

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