Ultra-thin PU foam coating thickness control mechanism

Abstract

The utility model belongs to the field of foam coating, and particularly relates to an ultra-thin PU foam coating thickness control mechanism which comprises an upper roller scraper, a lower roller scraper, an air pump, an oil-water separator and an allochroic silica gel dryer which are oppositely arranged up and down, a ventilation cavity is formed in the upper roller scraper, the length direction of the ventilation cavity is consistent with the axial direction of the upper roller scraper, and the air pump is arranged in the ventilation cavity. A ventilation cavity is formed in the upper roller scraper, air outlet holes which are densely distributed are formed in the lower portion of the upper roller scraper, an input port is formed in the upper portion of the upper roller scraper, the input port, the ventilation cavity and the air outlet holes are sequentially communicated, an outlet of the air pump is communicated with an inlet of the oil-water separator, an outlet of the oil-water separator is communicated with an inlet of the allochroic silicagel dryer, and an outlet of the allochroic silicagel dryer is communicated with an outlet of the upper roller scraper. And the outlet of the allochroic silicagel dryer is communicated with the input port. According to the utility model, the thickness of the ultra-thin PU coating material can be well controlled on the premise that the cutter is prevented from being stuck, and the thickness of the thicker PU coating material can also be controlled.

Description

Technical Field

[0001] The utility model belongs to the field of foam coating, and in particular relates to an ultra-thin PU foam coating thickness control mechanism. Background Art

[0002] Bubble cotton products are densely pore, low density, light weight, and have functions of cushioning protection, heat insulation, sound insulation, shockproof, etc. Polyurethane foam is one of the bubble cotton.

[0003] The production process of polyurethane foam is roughly as follows: first, the AB materials are evenly mixed through a high-speed mixer head to become PU materials, then the PU materials are coated on release paper, and then PET and other raw materials are covered on the upper layer of the PU materials. After the three form a sandwich structure, the three are then passed between the upper roller scraper and the lower roller scraper. The thickness is evenly rolled by the roller scraper, and the thickness is also controlled by the roller scraper. Finally, they enter the oven for foaming and maturation.

[0004] The foaming ratio of PU material is generally between 3-4 times. When making thicker raw materials, due to the larger gap between the upper roller scraper and the lower roller scraper, the PU coating material can pass through the scraper smoothly.

[0005] However, since some polyurethane foams are used in 3C and other fields, they require ultra-thin specifications such as 0.2mm and 0.1mm thickness. Excluding the foaming ratio of the PU material, the scraper gap needs to be adjusted to about tens of microns. Since the scraper itself, the release paper and the PET itself have thickness tolerances, the thickness of the PU coating material will be greater than the scraper gap, causing the combined material to get stuck after passing between the upper roller scraper and the lower roller scraper. The raw materials will be scraped by the scraper, greatly reducing the yield rate. Utility Model Content

[0006] Therefore, the technical problem to be solved by the utility model is to overcome the defect that the PU foam coating material often gets stuck when passing between the upper roller scraper and the lower roller scraper when the thickness of the ultra-thin PU foam coating material is currently controlled, thereby providing an ultra-thin PU foam coating thickness control mechanism.

[0007] In order to solve the above technical problems, the utility model provides an ultra-thin PU foam coating thickness control mechanism, comprising an upper roller scraper, a lower roller scraper, an air pump, an oil-water separator and a color-changing silica gel dryer which are arranged relatively to each other up and down, a ventilation cavity is provided inside the upper roller scraper, the length direction of the ventilation cavity is consistent with the axial direction of the upper roller scraper, densely arranged air outlet holes are provided below the upper roller scraper, an input port is provided above the upper roller scraper, the input port, the ventilation cavity and the air outlet holes are connected in sequence, the outlet of the air pump is connected to the inlet of the oil-water separator, the outlet of the oil-water separator is connected to the inlet of the color-changing silica gel dryer, and the outlet of the color-changing silica gel dryer is connected to the input port.

[0008] Preferably, it also includes an integrated shell, and the air pump, the oil-water separator and the color-changing silica gel dryer can be detachably fixed in the integrated shell, one side of the integrated shell is provided with an opening, the side with the opening is equipped with a detachable cover, and one side of the integrated shell is provided with a visual window, and the position of the visual window corresponds to the position of the color-changing silica gel dryer.

[0009] Preferably, two opposite sides of the integrated housing are each provided with a plurality of densely packed heat dissipation holes.

[0010] Preferably, the air outlet holes are arranged in two dimensions, the air outlet holes are arranged in several rows along the circumference of the upper roller scraper, and the air outlet holes are arranged in several rows along the axial direction of the upper roller scraper.

[0011] Preferably, each of the air outlets is connected to a pressure relief valve, and the air outlet of the pressure relief valve is vertically downward, facing the lower roller scraper.

[0012] Preferably, a plurality of air outlet nozzles are fixed on each air outlet hole, and the air outlet nozzles are detachably connected to the pressure relief valve, and pressure relief valves with different pressure upper limits can be installed on the air outlet nozzles each time.

[0013] The technical solution of the utility model has the following beneficial effects:

[0014] The utility model includes an air pump, an oil-water separator and a color-changing silica gel dryer, and a plurality of dense air outlet holes are arranged below the upper roller scraper, an input port is arranged above the upper roller scraper, and a ventilation cavity is arranged inside the upper roller scraper. The air pump plays the role of providing an air source, the air pump compresses the gas and transports the gas, the oil-water separator and the color-changing silica gel dryer remove the oil and water in the gas, and finally the clean and dry gas is passed into the ventilation cavity through the input port and then blown out through the air outlet. The thickness of the ultra-thin PU coating material is controlled by blowing out the pressurized gas. Of course, the upper roller scraper itself has no effect on the ultra-thin PU coating material at this time.

[0015] The utility model can control the thickness of ultra-thin PU coating materials (the upper roller scraper does not work at this time, relying on the blowing method), and can also control the thickness of thicker PU coating materials (only the upper roller scraper and the lower roller scraper work at this time). BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall appearance of the utility model;

[0018] Figure 2 This is a three-dimensional cross-sectional view of the utility model air pump, oil-water separator, and color-changing silica gel dryer located in an integrated housing;

[0019] Figure 3 It is a three-dimensional cross-sectional view of the upper roller scraper of the utility model.

[0020] Explanation of the reference numerals: 1. upper roller scraper; 11. ventilation cavity; 12. air outlet; 13. input port; 2. lower roller scraper; 3. air pump; 4. oil-water separator; 5. color-changing silica gel dryer; 6. integrated housing; 62. air outlet pipe; 63. opening; 64. cover; 65. heat dissipation hole; 66. visual window; 7. air outlet nozzle; 8. pressure relief valve. DETAILED DESCRIPTION

[0021] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] The utility model provides an ultra-thin PU foam coating thickness control mechanism, comprising an upper roller scraper 1, a lower roller scraper 2, an air pump 3, an oil-water separator 4 and a color-changing silica gel dryer 5. The upper roller scraper 1 and the lower roller scraper 2 are arranged opposite to each other up and down. A ventilation cavity 11 is arranged inside the upper roller scraper 1. The length direction of the ventilation cavity 11 is consistent with the axial direction of the upper roller scraper 1. Densely arranged air outlet holes 12 are arranged below the upper roller scraper 1, and an input port 13 is arranged above the upper roller scraper 1. The input port 13, the ventilation cavity 11 and the air outlet holes 12 are connected in sequence. The outlet of the air pump 3 is connected to the inlet of the oil-water separator 4, the outlet of the oil-water separator 4 is connected to the inlet of the color-changing silica gel dryer 5, and the outlet of the color-changing silica gel dryer 5 is connected to the input port 13.

[0026] The working principle of the utility model is as follows: after the PU coating is completed on the release paper, the PET raw material is covered to form a PU coating material with a three-layer structure of release paper, PU and PET; the utility model is started a period of time in advance before the PU coating material is formed: the air pump 3 is started to supply air. In order to avoid the greater influence of moisture and oil in the gas on the foaming of polyurethane (the foaming ratio becomes larger, thereby causing uneven thickness of the foaming material), the gas generated by the air pump 3 first passes through the oil-water separator 4 and the color-changing silica gel dryer 5 in sequence, and then enters the ventilation cavity 11 of the upper roller scraper 1. When the gas enters the oil-water separator 4, the oil-water separator 4 intercepts the oil and water in the gas. At this time, most of the oil and water in the air are excluded, and the air is preliminarily purified. Then the air enters the color-changing silica gel dryer 5 for drying, so that the air is thoroughly purified and dried. The air entering the ventilation cavity 11 will come out from a plurality of densely arranged air outlet holes 12. When the PU coating material slowly passes between the upper roller scraper 1 and the lower roller scraper 2, the gas is evenly blown toward the PU coating material, making the PU coating material thin, thereby indirectly controlling the thickness of the PU layer, making the thickness of the produced PU foam very thin.

[0027] When it is observed that the color-changing silica gel in the color-changing silica gel dryer 5 changes color to a darker color, it means that the silica gel has absorbed a lot of water and its water absorption capacity has become weak, and it needs to be replaced.

[0028] In order to facilitate on-site installation and improve the efficiency of on-site installation, the utility model integrates most of the components together. Specifically, the utility model also includes an integrated housing 6, and the air pump 3, the oil-water separator 4 and the color-changing silica gel dryer 5 can be detachably fixed in the integrated housing 6. During installation, it is only necessary to take the integrated housing 6 equipped with the air pump 3, the oil-water separator 4 and the color-changing silica gel dryer 5 to the site, and then connect the air outlet pipe 62 of the integrated housing 6 to the input port 13 of the upper roller scraper 1.

[0029] An opening 63 is provided on one side of the integrated housing 6, and a detachable cover 64 is provided on the side provided with the opening 63, so that the air pump 3, the oil-water separator 4 and the color-changing silica gel dryer 5 can be conveniently placed into the integrated housing 6 through the opening 63, and the detachable cover 64 can be waterproof and dustproof. Since the color of the color-changing silica gel in the color-changing silica gel dryer 5 needs to be frequently observed, a visual window 66 is provided on one side of the integrated housing 6, and the position of the visual window 66 corresponds to the position of the color-changing silica gel dryer 5. Workers can see the color-changing silica gel in the color-changing silica gel dryer 5 through the visual window 66.

[0030] In order to prevent the heat generated by the air pump 3 from accumulating in the integrated housing 6 and damaging the internal devices, a plurality of dense heat dissipation holes 65 are respectively provided on two opposite sides of the integrated housing 6. External cold air enters from the heat dissipation holes 65 on one side, absorbs the heat in the integrated housing 6, and then goes out from the heat dissipation holes 65 on the other side, thereby continuously taking away the heat and maintaining the normal temperature in the integrated housing 6.

[0031] In order to improve the uniformity and amount of blowing and to uniformly control the thickness of the semi-finished product, the air outlet holes 12 are arranged in two dimensions, with several rows of air outlet holes 12 arranged along the circumference of the upper roller scraper 1 and several rows of air outlet holes 12 arranged along the axial direction of the upper roller scraper 1.

[0032] Each air outlet 12 is connected to a pressure relief valve 8, and the air outlet of the pressure relief valve 8 is vertically downward, facing the lower roller scraper 2. When the measuring end of the pressure relief valve 8 detects that the uniform air pressure value in the ventilation cavity 11 reaches the pressure relief value of the hydraulic valve, the hydraulic valve opens to discharge the gas, so that the pressure value of the gas blown out of each air outlet 12 reaches a predetermined value, and the pressure of the gas blown out of each air outlet 12 to the semi-finished product is uniform, and the thickness of the semi-finished product is uniform.

[0033] A plurality of air outlet nozzles 7 are fixed on each air outlet 12, and the air outlet nozzles 7 are detachably connected to the pressure relief valve 8. Pressure relief valves 8 with different pressure limits can be installed on the air outlet nozzles 7 each time. Since the thickness required for each batch of PU raw materials produced is different and the viscosity after proportioning is also different, the pressure value of the gas blown out of the air outlet 12 is also different. The pressure relief and air outlet nozzles 7 are set to be detachably fixed, and pressure relief valves 8 with different pressure relief values ​​can be selected according to the thickness value required by the PU and the viscosity value after proportioning.

[0034] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An ultra-thin PU foam coating thickness control mechanism, comprising an upper roller scraper (1) and a lower roller scraper (2) arranged opposite to each other, characterized in that: It also includes an air pump (3), an oil-water separator (4) and a color-changing silica gel dryer (5); a ventilation cavity (11) is provided inside the upper roller scraper (1); the length direction of the ventilation cavity (11) is consistent with the axial direction of the upper roller scraper (1); densely arranged air outlet holes (12) are provided below the upper roller scraper (1); an input port (13) is provided above the upper roller scraper (1); the input port (13), the ventilation cavity (11) and the air outlet holes (12) are connected in sequence; the outlet of the air pump (3) is connected to the inlet of the oil-water separator (4); the outlet of the oil-water separator (4) is connected to the inlet of the color-changing silica gel dryer (5); and the outlet of the color-changing silica gel dryer (5) is connected to the input port (13).

2. The ultra-thin PU foam coating thickness control mechanism according to claim 1, characterized in that: It also includes an integrated housing (6), wherein the air pump (3), the oil-water separator (4) and the color-changing silica gel dryer (5) can be detachably fixed in the integrated housing (6), one side of the integrated housing (6) is provided with an opening (63), and the side with the opening (63) is equipped with a detachable cover (64), and one side of the integrated housing (6) is provided with a visual window (66), and the position of the visual window (66) corresponds to the position of the color-changing silica gel dryer (5).

3. The ultra-thin PU foam coating thickness control mechanism according to claim 2, characterized in that: Two opposite side surfaces of the integrated housing (6) are each provided with a plurality of densely packed heat dissipation holes (65).

4. The ultra-thin PU foam coating thickness control mechanism according to claim 1, characterized in that: The air outlet holes (12) are arranged in two dimensions. The air outlet holes (12) are arranged in a plurality of rows along the circumference of the upper roller scraper (1), and the air outlet holes (12) are arranged in a plurality of rows along the axial direction of the upper roller scraper (1).

5. The ultra-thin PU foam coating thickness control mechanism according to claim 1, characterized in that: Each of the air outlet holes (12) is externally connected to a pressure relief valve (8), and the air outlet of the pressure relief valve (8) is vertically downward and faces the lower roller scraper (2).

6. The ultra-thin PU foam coating thickness control mechanism according to claim 5, characterized in that: A plurality of air outlet nozzles (7) are fixed on each air outlet hole (12); the air outlet nozzles (7) are detachably connected to the pressure relief valve (8); and pressure relief valves (8) with different upper pressure limits can be installed on the air outlet nozzles (7) each time.

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