Efficient cooling device for plastic foam product production

Abstract

The invention relates to the technical field of polyurethane foam plastic processing, in particular to an efficient cooling device for plastic foam product production. The upper end of the interior of a first box body is connected with an extrusion mechanism used for fixing, and the bottom end of a movable pipe communicates with a first circular ring pipe; a plurality of air nozzles are formed in the inner ring wall of the first circular ring pipe at equal intervals in the axis direction, and a water mist cooling mechanism used for cooling is connected into the first box body. A lifting mechanism is started to drive a first circular ring pipe to move in the vertical direction, gas released by a gas pump is guided into a movable pipe through a first connecting pipe and then enters the first circular ring pipe, the gas in the first circular ring pipe is released from a plurality of gas spraying openings, the plastic foam product is subjected to air cooling, and the gas spraying openings are located in the outer side of the plastic foam product; the plastic foam product can be purged from multiple angles, the heat dissipation efficiency is improved, and meanwhile after water mist released by the water mist cooling mechanism is matched with purge gas, the cooling speed of the plastic foam product is increased.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane foam plastic processing, in particular to a high-efficiency cooling and temperature reduction device for producing plastic foam products. Background Art

[0002] Polyurethane foam is a type of porous polymer material made from polyurethane as the main raw material through chemical reaction foaming. It is characterized by low density, good elasticity, and excellent thermal insulation and sound insulation properties. It is widely used in furniture, construction, automobiles, packaging and other fields. The processing steps of polyurethane foam generally include plastic ingredients, molding, mechanical processing, joining and modification. Polyurethane foam generally has a high temperature after molding and needs to be cooled in time to ensure the smoothness of the product.

[0003] In the prior art, when cooling a plastic foam product, a fan is used to release gas to cool the plastic foam product. The generated cooling gas is blown from a fixed position to cool the plastic foam product. However, the plastic foam product has a certain height, so that some areas of the plastic foam product cannot come into contact with the cooling gas, thereby reducing the heat dissipation rate of the plastic foam product. Moreover, when cooling the plastic foam product by simply blowing gas, the cooling rate is slow, and the plastic foam product cannot be cooled quickly. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art in that the cooling gas generated is blown from a fixed position to cool the plastic foam product, resulting in some areas of the plastic foam product being unable to contact the cooling gas, thereby reducing the heat dissipation rate of the plastic foam product, and to propose a high-efficiency cooling device for the production of plastic foam products.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A high-efficiency cooling and temperature-reducing device for the production of plastic foam products is designed, comprising a first box body, an air pump fixedly connected to the upper end of the first box body, an outlet end of the air pump being connected to a first connecting pipe, one end of the first connecting pipe extending into the first box body and being sealed and plugged with a movable pipe, an extrusion mechanism for fixing being connected to the upper end of the interior of the first box body, a lifting mechanism for driving the movable pipe to reciprocate in a vertical direction being connected to the interior of the first box body, a first annular tube being connected to the bottom end of the movable tube, a plurality of air jets being provided on the inner ring wall of the first annular tube at equal intervals along the axis direction, a water mist cooling mechanism for cooling being connected to the interior of the first box body, and a first exhaust pipe being connected to one side of the first box body.

[0006] Preferably, the extrusion mechanism includes a groove column, which is fixedly connected to the inner upper end of the first box body, and a movable rod is slidably connected in the groove column. The upper end of the movable rod is fixedly connected to a spring, and one end of the spring is fixedly connected to the groove column.

[0007] Preferably, a protruding block is fixedly connected to the bottom end of the movable rod.

[0008] Preferably, the lifting mechanism includes a slide frame, which is fixedly connected to the first box body, a movable plate is slidably connected to the slide frame, and the movable plate is fixedly connected to the movable tube, the upper end of the first box body is fixedly connected to a motor, and the output end of the motor extends into the first box body and is fixedly connected to a reciprocating screw that drives the movable plate to move.

[0009] Preferably, the bottom end of the first annular tube is fixedly connected to an air guide cover, and a plurality of air guide grooves are provided on the inner ring wall of the air guide cover at equal intervals along the axis direction.

[0010] Preferably, the water mist cooling mechanism includes a liquid pump, which is fixedly connected to the first box body, the inlet end of the liquid pump is connected to a second connecting pipe, one end of the second connecting pipe extends outside the first box body and is connected to a water tank, the water tank is connected to the bottom plate, the outlet end of the liquid pump is connected to a third connecting pipe, one end of the third connecting pipe is connected to a second circular tube, the second circular tube is located on the inner side of the first circular tube, and the bottom end of the second circular tube is connected to a plurality of atomizing nozzles at equal intervals along the axial direction.

[0011] Preferably, the water tank is connected to a heat dissipation mechanism, and the heat dissipation mechanism includes a groove plate, the groove plate is fixedly connected to the upper end of the support frame, the upper end of the groove plate is connected to a thermal pad, the bottom end of the thermal pad is fixedly connected to two parallel heat-conducting columns, one end of each heat-conducting column passes through the groove plate and the support frame, and the water tank is connected to two parallel fixed pipes, one end of each heat-conducting column is sealed and inserted into the corresponding fixed pipe.

[0012] Preferably, a heat exchange mechanism is fixedly connected to the water tank, and the heat exchange mechanism includes a second box body, the second box body is fixedly connected to the water tank, a heat exchange tube is connected to the second box body, and a plurality of cooling fins are connected to the heat exchange tube at equal intervals along the length direction. One end of the heat exchange tube is connected to the first exhaust pipe, and the other end of the heat exchange tube extends outside the second box body, and a heat sink for heat dissipation is connected to the second box body.

[0013] Preferably, the other end of the heat exchange tube is connected to a dehumidification mechanism, and the dehumidification mechanism includes an open box, which is fixedly connected to the upper end of the second box body, and the bottom end of the open box is connected to the heat exchange tube. The inner bottom end of the open box is provided with a blocking net, and the upper end of the blocking net is provided with a hygroscopic filler layer. A sealing plate is connected to the opening of the open box, and the upper end of the sealing plate is connected to the second exhaust pipe.

[0014] Preferably, the hygroscopic filler layer is a water-absorbing silica gel particle filler layer.

[0015] The invention proposes a high-efficiency cooling device for the production of plastic foam products, which has the following beneficial effects: 1. After the lifting mechanism is started, the first annular tube is driven to move in the vertical direction. The gas released by the air pump is introduced into the movable tube through the first connecting tube and then enters the first annular tube. The gas in the first annular tube is released from a number of air jets to cool the plastic foam product. The air jets are located on the outside of the plastic foam product and can be blown from multiple angles to improve the heat dissipation efficiency. At the same time, the water mist released by the water mist cooling mechanism cooperates with the blowing gas to increase the cooling speed of the plastic foam product.

[0016] 2. The cooling water in the water tank contacts the heat-conducting column, which cools the heat-conducting column, thereby cooling the heat-conducting pad, and then dissipating heat and cooling the bottom of the plastic foam product, which can effectively and quickly dissipate heat and cool the bottom of the plastic foam product.

[0017] 3. The heat exchange tube contacts the water in the second box to exchange heat and cool the gas in the heat exchange tube, thereby reducing the temperature of the gas in the heat exchange tube. The temperature of the gas after heat exchange is reduced, so it will not cause burns to people.

[0018] 4. The hygroscopic filler layer dries the gas with water mist, and the dried gas is released from the second exhaust pipe, thereby preventing the water mist from entering the working environment and thus not affecting the operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a high-efficiency cooling device for the production of plastic foam products proposed by the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a high-efficiency cooling device for the production of plastic foam products proposed by the present invention. Figure 2 ; Figure 3 This is a schematic cross-sectional view of a high-efficiency cooling device for producing plastic foam products proposed by the present invention; Figure 4This is a structural schematic diagram of the connection between the first box and the water mist cooling mechanism in a high-efficiency cooling and temperature reduction device for producing plastic foam products proposed by the present invention; Figure 5 This is a schematic structural diagram of the connection between the movable pipe and the lifting mechanism in a high-efficiency cooling device for producing plastic foam products proposed by the present invention; Figure 6 This is a schematic structural diagram of the connection between the water tank and the heat dissipation mechanism in a high-efficiency cooling and temperature reduction device for the production of plastic foam products proposed by the present invention; Figure 7 This is a schematic structural diagram of the connection between the heat exchange mechanism and the dehumidification mechanism in a high-efficiency cooling device for producing plastic foam products proposed by the present invention; Figure 8 The present invention provides a schematic cross-sectional structural diagram of the connection between a heat exchange mechanism and a dehumidification mechanism in a high-efficiency cooling and temperature reduction device for producing plastic foam products.

[0020] In the figure: 1, first box; 2, rotating door; 3, support frame; 4, extrusion mechanism; 5, air pump; 6, first connecting pipe; 7, movable pipe; 8, lifting mechanism; 9, first annular pipe; 10, bottom plate; 11, air jet; 12, water mist cooling mechanism; 13, first exhaust pipe; 14, air guide cover; 15, air guide groove; 16, heat dissipation mechanism; 17, heat exchange mechanism; 18, dehumidification mechanism; 41, groove column; 42, movable rod; 43, spring; 44, protrusion; 81, slide frame; 82, movable plate; 8 3. Motor; 84. Reciprocating screw; 121. Liquid pump; 122. Second connecting pipe; 123. Third connecting pipe; 124. Second annular pipe; 125. Atomizing nozzle; 126. Water tank; 161. Grooved plate; 162. Thermal pad; 163. Thermal column; 164. Fixed pipe; 171. Second box; 172. Heat exchange tube; 173. Heat dissipating fin; 174. Heat sink; 181. Open box; 182. Screen; 183. Hygroscopic filler layer; 184. Sealing plate; 185. Second exhaust pipe. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Example 1: Reference Figure 1-4, a high-efficiency cooling and temperature-reducing device for the production of plastic foam products, comprising a first box body 1, the first box body 1 is fixedly connected to a bottom plate 10, a rotating door 2 is rotatably connected to the first box body 1, a support frame 3 is fixedly connected to the bottom end of the interior of the first box body 1, an air pump 5 is fixedly connected to the upper end of the first box body 1, the outlet end of the air pump 5 is connected to a first connecting pipe 6, one end of the first connecting pipe 6 extends into the first box body 1 and is sealed and plugged with a movable pipe 7, the upper end of the interior of the first box body 1 is connected to a fixed extrusion mechanism 4, the first A lifting mechanism 8 for driving a movable tube 7 to reciprocate in a vertical direction is connected to a box body 1. The bottom end of the movable tube 7 is connected to a first annular tube 9. A plurality of air jets 11 are provided on the inner ring wall of the first annular tube 9 at equal intervals along the axis. A water mist cooling mechanism 12 for cooling is connected to the first box body 1. A first exhaust pipe 13 is provided on one side of the first box body 1. An air guide hood 14 is fixedly connected to the bottom end of the first annular tube 9. A plurality of air guide grooves 15 are provided on the inner ring wall of the air guide hood 14 at equal intervals along the axis. The squeezing mechanism 4 includes a groove column 41, which is fixedly connected to the inner upper end of the first box body 1. A movable rod 42 is slidably connected in the groove column 41. The upper end of the movable rod 42 is fixedly connected to a spring 43. One end of the spring 43 is fixedly connected to the groove column 41. The bottom end of the movable rod 42 is fixedly connected to a protrusion 44. The lifting mechanism 8 includes a slide frame 81, which is fixedly connected to the first box body 1. A movable plate 82 is slidably connected to the slide frame 81, and the movable plate 82 is fixedly connected to the movable tube 7. The upper end of the first box body 1 is fixedly connected to a motor 83. The output end of the motor 83 extends into the first box body 1 and is fixedly connected to a reciprocating screw 84 that drives the movable plate 82 to move. The water mist cooling mechanism 12 includes a liquid pump 121, which is fixedly connected to the first box body 1. The inlet end of the liquid pump 121 is connected to a second connecting pipe 122. One end of the second connecting pipe 122 extends to the outside of the first box body 1 and is connected to a water tank 126. The water tank 126 is connected to the bottom plate 10. The outlet end of the liquid pump 121 is connected to a third connecting pipe 123. One end of the third connecting pipe 123 is connected to a second circular tube 124. The second circular tube 124 is located on the inner side of the first circular tube 9. The bottom end of the second circular tube 124 is connected to a plurality of atomizing nozzles 125 at equal intervals along the axial direction.

[0023] Working process: Pull the rotating door 2 to open the first box body 1, push the movable rod 42 upward, the movable rod 42 drives the protruding block 44 to move upward, so that the distance between the protruding block 44 and the support frame 3 increases, and the movable rod 42 squeezes the spring 43 when it moves upward. The spring 43 generates an elastic restoring force after being compressed, and the plastic foam product is placed on the support frame 3. Then release the movable rod 42, and the movable rod 42 moves downward and resets under the action of the elastic restoring force of the spring 43, and drives the protruding block 44 to move downward, squeezing and fixing the plastic foam product, making it easy to fix the plastic foam product; After the revolving door 2 is closed, the controller controls the air pump 5 to be powered on and started. The gas released by the air pump 5 is introduced into the movable tube 7 through the first connecting tube 6 and then enters the first annular tube 9. The gas in the first annular tube 9 is released from a plurality of air jets 11 to cool the plastic foam product. The air jets 11 are located on the outside of the plastic foam product and can be blown from multiple angles to improve the heat dissipation efficiency. The first annular tube 9 and the air guide groove 15 guide the gas between the plastic foam product and the first annular tube 9 so that the gas flows vertically downward and better contacts the surface of the plastic foam product, thereby improving the heat dissipation efficiency. The controller simultaneously controls the motor 83 to be powered on and started, and the motor 83 drives the reciprocating screw 84 to rotate. Under the guidance of the slide frame 81, the movable plate 82 moves back and forth in the vertical direction, thereby driving the movable tube 7 and the first annular tube 9 to move synchronously, so that the gas released from the air jet 11 can blow back and forth on the outer wall of the plastic foam product, ensuring that the gas is in full contact with the surface of the product, further improving the heat dissipation effect; The controller also controls the liquid pump 121 to be powered on and started. The liquid pump 121 draws cooling water from the water tank 126 through the second connecting pipe 122 and introduces it into the second annular pipe 124 through the third connecting pipe 123. The cooling water in the second annular pipe 124 is atomized and sprayed out from a plurality of atomizing nozzles 125. The generated water mist contacts the surface of the plastic foam product to assist in cooling. Under the combined action of the purge gas and the water mist, the cooling speed of the plastic foam product is increased, and the purge gas in the first box body 1 is finally discharged from the first exhaust pipe 13.

[0024] Example 2: The plastic foam product is placed on the support frame 3, and the bottom end of the plastic foam product is squeezed and contacted with the support frame 3, which causes the heat at the bottom of the plastic foam product to be released slowly, thereby reducing the cooling speed. Figure 6As another preferred embodiment of the present invention, the difference from Example 1 is that the water tank 126 is connected to a heat dissipation mechanism 16, and the heat dissipation mechanism 16 includes a groove plate 161, which is fixedly connected to the upper end of the support frame 3, and the upper end of the groove plate 161 is connected to a thermal pad 162, and the bottom end of the thermal pad 162 is fixedly connected to two parallel heat-conducting columns 163, which are integrally structured with the thermal pad 162. The thermal pad 162 is a heat-conducting rubber column, and one end of each heat-conducting column 163 passes through the groove plate 161 and the support frame 3. The water tank 126 is connected to two parallel fixed pipes 164, and one end of each heat-conducting column 163 is sealed and inserted into the corresponding fixed pipe 164; The bottom end of the plastic foam product is in contact with the thermal pad 162, and the heat from its bottom is transferred to the thermal pad 162. The thermal pad 162 transfers the heat to the thermal column 163, and the thermal column 163 is inserted into the fixed tube 164. The fixed tube 164 is connected to the water tank 126. The cooling water in the water tank 126 is in direct contact with the thermal column 163, thereby cooling the thermal column 163, thereby reducing the temperature of the thermal pad 162, and further realizing heat dissipation and cooling of the bottom of the plastic foam product, which can efficiently and quickly dissipate heat and cool the bottom of the plastic foam product.

[0025] Example 3: When the gas is discharged from the first exhaust pipe 13, the gas temperature discharged from the first exhaust pipe 13 is relatively high due to the heat exchange between the gas and the plastic foam product. Direct discharge may easily cause burns to personnel. Figure 6 As another preferred embodiment of the present invention, the difference from Example 2 is that a heat exchange mechanism 17 is fixedly connected to the water tank 126. The heat exchange mechanism 17 includes a second box body 171, which is fixedly connected to the water tank 126. A heat exchange tube 172 is connected to the second box body 171. A plurality of heat dissipation fins 173 are connected to the heat exchange tube 172 at equal intervals along the length direction. One end of the heat exchange tube 172 is connected to the first exhaust pipe 13, and the other end of the heat exchange tube 172 extends to the outside of the second box body 171. The second box body 171 is connected to a heat dissipation fin 174; The gas released from the first exhaust pipe 13 is introduced into the heat exchange tube 172, and the heat exchange tube 172 contacts the water in the second box body 171, and heat exchange and cools the gas in the tube, thereby reducing the gas temperature. At the same time, the heat sink 174 increases the contact area between the heat exchange tube 172 and the water, further improving the heat exchange efficiency. The gas after heat exchange is discharged from one end of the heat exchange tube 172, and its temperature has been reduced, avoiding the risk of burns to personnel. In addition, the heat sink 174 contacts the water in the second box body 171, which helps to dissipate heat from the water and reduce the water temperature, thereby maintaining the continuous heat exchange effect of the second box body 171 on the heat exchange tube 172.

[0026] Example 4: When the gas is released through the first exhaust pipe 13, the gas contains a lot of water mist. Direct discharge will cause a humid working environment and affect the operation of the equipment. Figure 7-8 As another preferred embodiment of the present invention, the difference from Example 3 is that the other end of the heat exchange tube 172 is connected to the dehumidification mechanism 18, and the dehumidification mechanism 18 includes an open box 181, which is fixedly connected to the upper end of the second box body 171, and the bottom end of the open box 181 is connected to the heat exchange tube 172. The bottom end of the open box 181 is provided with a blocking net 182, and the upper end of the blocking net 182 is provided with a hygroscopic packing layer 183, which is a water-absorbing silica gel particle packing layer. The open end of the open box 181 is connected to a sealing plate 184, and the upper end of the sealing plate 184 is connected to the second exhaust pipe 185. The gas carrying the water mist is introduced into the open box 181 after heat exchange through the heat exchange tube 172, and contacts the hygroscopic filler layer 183 after passing through the blocking net 182. The blocking net 182 blocks the hygroscopic filler layer 183 to prevent the hygroscopic filler layer 183 from falling into the heat exchange tube 172. The hygroscopic filler layer 183 dries the gas carrying the water mist, and the dried gas is released from the second exhaust pipe 185, thereby preventing the water mist from entering the working environment and thus not affecting the operation of the equipment.

[0027] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A high-efficiency cooling device for the production of plastic foam products, comprising a first box (1), an air pump (5) fixedly connected to the upper end of the first box (1), an outlet end of the air pump (5) connected to a first connecting pipe (6), one end of the first connecting pipe (6) extending into the first box (1) and sealed with a movable pipe (7), characterized in that: in: The upper end of the interior of the first box (1) is connected to a squeezing mechanism (4) for fixing, the first box (1) is connected to a lifting mechanism (8) for driving the movable tube (7) to move back and forth in the vertical direction, the bottom end of the movable tube (7) is connected to a first annular tube (9), a plurality of jet ports (11) are provided on the inner ring wall of the first annular tube (9) at equal intervals along the axis direction, the first box (1) is connected to a water mist cooling mechanism (12) for cooling, and one side of the first box (1) is connected to a first exhaust pipe (13).

2. The high-efficiency cooling device for the production of plastic foam products according to claim 1, characterized in that: The squeezing mechanism (4) comprises a groove column (41), the groove column (41) being fixedly connected to the inner upper end of the first box body (1), a movable rod (42) being slidably connected inside the groove column (41), a spring (43) being fixedly connected to the upper end of the movable rod (42), and one end of the spring (43) being fixedly connected to the groove column (41).

3. The high-efficiency cooling device for the production of plastic foam products according to claim 2, characterized in that: The bottom end of the movable rod (42) is fixedly connected with a protruding block (44).

4. The high-efficiency cooling device for producing plastic foam products according to claim 1, characterized in that: The lifting mechanism (8) includes a slide frame (81), the slide frame (81) is fixedly connected to the first box body (1), a movable plate (82) is slidably connected to the slide frame (81), and the movable plate (82) is fixedly connected to the movable tube (7), and the upper end of the first box body (1) is fixedly connected to a motor (83), and the output end of the motor (83) extends into the first box body (1) and is fixedly connected to a reciprocating screw (84) that drives the movable plate (82) to move.

5. The high-efficiency cooling device for producing plastic foam products according to claim 1, characterized in that: The bottom end of the first annular tube (9) is fixedly connected to an air guide cover (14), and a plurality of air guide grooves (15) are provided on the inner ring wall of the air guide cover (14) at equal intervals along the axis direction.

6. The high-efficiency cooling device for producing plastic foam products according to claim 1, characterized in that: The water mist cooling mechanism (12) includes a liquid pump (121), the liquid pump (121) is fixedly connected to the first box body (1), the inlet end of the liquid pump (121) is connected to a second connecting pipe (122), one end of the second connecting pipe (122) extends to the outside of the first box body (1) and is connected to a water tank (126), the water tank (126) is connected to the bottom plate (10), the outlet end of the liquid pump (121) is connected to a third connecting pipe (123), one end of the third connecting pipe (123) is connected to a second annular pipe (124), the second annular pipe (124) is located on the inner side of the first annular pipe (9), and the bottom end of the second annular pipe (124) is connected to a plurality of atomizing nozzles (125) at equal intervals along the axial direction.

7. The high-efficiency cooling device for producing plastic foam products according to claim 6, characterized in that: The water tank (126) is connected to a heat dissipation mechanism (16), and the heat dissipation mechanism (16) includes a groove plate (161), the groove plate (161) is fixedly connected to the upper end of the support frame (3), the upper end of the groove plate (161) is connected to a heat-conducting pad (162), and the bottom end of the heat-conducting pad (162) is fixedly connected to two parallel heat-conducting columns (163), one end of each heat-conducting column (163) passes through the groove plate (161) and the support frame (3), and the water tank (126) is connected to two parallel fixed pipes (164), and one end of each heat-conducting column (163) is sealed and inserted into the corresponding fixed pipe (164).

8. The high-efficiency cooling device for producing plastic foam products according to claim 7, characterized in that: A heat exchange mechanism (17) is fixedly connected to the water tank (126), and the heat exchange mechanism (17) includes a second box body (171). The second box body (171) is fixedly connected to the water tank (126). A heat exchange tube (172) is connected inside the second box body (171). A plurality of heat dissipation fins (173) are connected to the heat exchange tube (172) at equal intervals along the length direction. One end of the heat exchange tube (172) is connected to the first exhaust pipe (13), and the other end of the heat exchange tube (172) extends to the outside of the second box body (171). A heat dissipation fin (174) is connected to the second box body (171) for heat dissipation.

9. The high-efficiency cooling device for producing plastic foam products according to claim 8, characterized in that: The other end of the heat exchange tube (172) is connected to a dehumidification mechanism (18), and the dehumidification mechanism (18) includes an open box (181), the open box (181) is fixedly connected to the upper end of the second box body (171), the bottom end of the open box (181) is connected to the heat exchange tube (172), the inner bottom end of the open box (181) is provided with a blocking net (182), the upper end of the blocking net (182) is provided with a hygroscopic filler layer (183), the opening of the open box (181) is connected to a sealing plate (184), and the upper end of the sealing plate (184) is connected to a second exhaust pipe (185).

10. The high-efficiency cooling device for producing plastic foam products according to claim 9, characterized in that: The hygroscopic filler layer (183) is a water-absorbing silica gel particle filler layer.

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