Laminating method and equipment based on powder cooling and shaping

Abstract

The present invention discloses a coating composite method and equipment based on powder cooling and shaping, wherein the substrate is fed between a composite pressure roller and a composite cooling roller, and a powder spraying device sprays lubricating powder on the surface of the composite cooling roller; the plastic melt is extruded and coated and composited on the substrate surface, and during the composite process, one side of the plastic melt contacts the surface of the composite cooling roller; the composite material formed after the composite is cooled and shaped, and is sent out through a composite stripping roller. The equipment comprises an unwinding mechanism, a composite pressure roller, a composite cooling roller and a composite stripping roller arranged along the substrate conveying direction, a composite surface is formed at the junction of the composite pressure roller and the composite cooling roller, an extruder die head is arranged above the composite surface, a powder spraying device is arranged above the composite cooling roller, and a cooling and shaping area of ​​the composite material is formed at the bottom of the composite cooling roller. The present invention can improve the situation that the coating adheres to the surface of the composite roller to a greater extent, improve its cooling and shaping effect, and improve production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of coating material preparation, and in particular to a coating composite method and equipment based on powder cooling and shaping. Background Art

[0002] The thermal conductivity of polymer materials is generally low, usually between 0.1 and 0.5 W / m·K. This is because it contains a large number of pores and voids, which makes its density low and the heat transfer rate is hindered. In addition, its thermal conductivity is also affected by other factors, such as the type of plastic, aggregate structure, thickness, density, temperature, etc. In the laminating process, the laminating temperature of polyolefin materials is about 310°C, and the temperature of the composite cooling roller is about 25°C, so that its supercooling reaches 285°C, and polyolefin has a high degree of crystallinity, which makes it easy to cool and shape during laminating. For some materials that are not easy to crystallize, such as copolymers of butylene adipate and butylene terephthalate (PBAT), polyhydroxyalkanoate (PHA) and other molecular chains have good flexibility, but polymers that are not easy to crystallize have a very slow cooling and shaping rate. In the operation process of laminating, the laminating material is very easy to adhere to the molding equipment, which causes certain obstacles to the continuous production of composite materials, and at the same time, it will also have a great impact on the molding effect of composite materials. If the laminating process completely relies on cooling rollers to force cooling and shaping, the cost will be high. For this reason, for PBAT laminating, there is a way to cool and shape the PBAT laminating film by spraying water to solve the above problems, but in the actual production process, the water spraying method is easy to cause failure or damage to the equipment. At the same time, the cooling water is sprayed on the surface of the composite roller. When the PBAT laminating film reaches the surface of the composite roller, it needs to pass a certain distance. At this time, its cooling and shaping effect has been greatly weakened. The PBAT laminating film will still adhere to the surface of the composite roller, affecting the normal progress of the continuous production process. Not only that, when water contacts the high-temperature PBAT melt (about 200°C), it will vaporize and produce some small bubbles. The bursting of small bubbles not only affects the appearance of the laminating surface, but also causes the thickness of the laminating film to change, making the thickness uneven, thereby affecting the barrier properties of the laminating composite material. In addition, water is easy to embed into the pits on the surface of the cooling roller. When it contacts the high-temperature plastic melt, acidic substances migrate into the water, corrode the surface of the cooling roller, and reduce the service life of the equipment. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a laminating method based on powder cooling and shaping, which can improve the adhesion of high-temperature laminating to the surface of the composite roller to a greater extent, improve the cooling and shaping effect of the laminating, and improve the production efficiency of PBAT laminating.

[0004] Another object of the present invention is to provide a coating composite device based on powder cooling and shaping, which is used to implement the above-mentioned coating composite method.

[0005] The technical solution of the present invention is: a laminating composite method based on powder cooling and shaping, comprising the following steps:

[0006] (1) The unwinding mechanism unwinds the substrate and continuously feeds it into the composite surface formed between the composite pressure roller and the composite cooling roller. At the same time, the powder spraying device located above the composite cooling roller continuously sprays the lubricating powder onto the surface of the composite cooling roller;

[0007] (2) The plastic melt is extruded through the extruder die head above the composite surface and coated on the substrate surface, and then enters the composite surface for composite. During the composite process, one side of the plastic melt contacts the surface of the composite cooling roller;

[0008] (3) As the composite cooling roller rotates, the laminated composite material formed after lamination is cooled and shaped, and finally sent out through the composite stripping roller.

[0009] In this laminating and compounding method, the lubricant powder is sprayed and used as a separating agent. On the one hand, it can effectively prevent the plastic melt from adhering to the molding equipment to ensure its continuous molding. On the other hand, it can effectively solve the problem of "blurring" during winding caused by stretching or uneven plasticization of the plastic melt during laminating, so that the surface is smooth after winding.

[0010] In the step (1), the specific process of the powder spraying device spraying the lubricating powder onto the surface of the composite cooling roller is as follows: the lubricating powder is pre-placed in the inner cavity of the powder spraying roller, and the surface of the powder spraying roller is distributed with pits and grooves that are connected to the inner cavity of the powder spraying roller, and the lubricating powder is embedded in the pits and grooves. During the rotation of the powder spraying roller, the powder spraying elastic line generates elastic force to the surface of the powder spraying roller at a regular time, so that the lubricating powder is bounced off and sprayed onto the surface of the composite cooling roller. Wherein, the rotation of the powder spraying roller is driven by the powder spraying roller reduction motor connected to one end thereof, and the powder spraying elastic line is intermittently and regularly bounced to the surface of the powder spraying roller under the action of the pulse collision assembly and the high-voltage generator connected to one end thereof. After the lubricating powder is bounced off and sprayed onto the surface of the composite cooling roller, it rotates with the composite cooling roller. When it reaches the composite surface, one side of the plastic melt coating is bonded to the substrate, and the other side of the plastic melt coating is prevented from adhering to the surface of the composite cooling roller under the action of the lubricating powder.

[0011] During the powder spraying process, a protective cover is arranged on the outer periphery of the powder spraying roller so that the lubricating powder falls onto the surface of the composite cooling roller within the range of the protective cover, thereby preventing the lubricating powder from excessively diffusing and affecting normal production.

[0012] The lubricating powder is corn starch, talcum powder or white carbon black. According to tests, the lubricating powder has no effect on the sealing strength of plastics. It adheres to the surface of plastic film and can also be used as a reinforcing agent, modifier, etc., which is beneficial to improving product performance.

[0013] The substrate is paper, film, non-woven fabric or mesh cloth, etc.; the plastic melt is PBAT, PHA or POE, etc.

[0014] The present invention discloses a coating composite device based on powder cooling and shaping, which is used to realize the above coating composite method. The device includes an unwinding mechanism, a composite pressure roller, a composite cooling roller and a composite stripping roller arranged along the substrate conveying direction. The joint of the composite pressure roller and the composite cooling roller forms a composite surface. An extruder die head for plastic melt coating is arranged above the composite surface. A powder spraying device is arranged above the composite cooling roller. The lower part of the composite cooling roller forms a cooling and shaping area of ​​the composite material. The unwinding mechanism releases the substrate and continuously delivers it to the composite surface formed between the composite pressure roller and the composite cooling roller. The powder spraying device sprays lubricating powder on the surface of the composite cooling roller. The extruder die head coats the substrate surface from top to bottom on the composite surface. The plastic melt is coated on the substrate surface and composited at the composite surface. At the same time, under the action of the lubricating powder, the phenomenon of plastic adhering to the surface of the composite cooling roller is avoided. After the plastic melt is composited with the substrate, it enters the cooling and shaping area for cooling and shaping as the composite cooling roller rotates, and then is sent out by the composite stripping roller.

[0015] The powder spraying device includes a bracket, a powder spraying roller, a powder spraying elastic line, a powder spraying roller reduction motor, a high-voltage generator and a pulse collision component. The powder spraying roller is installed above the composite cooling roller through the bracket. The powder spraying elastic line is arranged on the outer surface of the powder spraying roller facing the composite cooling roller. One end of the powder spraying roller is connected to the powder spraying roller reduction motor, and one end of the powder spraying elastic line is connected to the pulse collision component and the high-voltage generator in sequence. The powder spraying roller rotates continuously under the drive of the powder spraying roller reduction motor, and the powder spraying elastic line is intermittently and regularly bounced to the surface of the powder spraying roller under the action of the pulse collision component and the high-voltage generator.

[0016] The inner cavity of the powder spraying roller is pre-installed with lubricating powder, and the surface of the powder spraying roller is distributed with pits and grooves connected with the inner cavity of the powder spraying roller. The lubricating powder is embedded in the pits and grooves. Under the elastic force of the elastic wire, the lubricating powder falls from the pits and grooves and sprays onto the surface of the composite cooling roller.

[0017] A protective cover is also provided on the periphery of the powder spraying roller to prevent the smooth powder from excessively diffusing and affecting normal production. The upper part of the protective cover is rectangular, and the lower part of the protective cover is arranged in an eight-shaped shape from top to bottom. The powder spraying roller is located in the protective cover, and the lower end of the protective cover extends close to the surface of the composite cooling roller, but a gap is left between the lower end of the protective cover and the surface of the composite cooling roller.

[0018] Along the circumferential direction of the composite cooling roller, the arc length of the composite cooling roller covered by the lower end of the protective cover is 1 / 6 to 1 / 4 of the overall circumference of the composite cooling roller. Among them, the diameter of the powder spraying roller is much smaller than the diameter of the composite cooling roller. The powder spraying area of ​​the powder spraying roller should not be too large, otherwise it is easy to cause the smooth powder to spread excessively and affect normal production. The powder spraying area of ​​the powder spraying roller should not be too small, otherwise the powder spraying amount is too small and it is difficult to achieve the purpose of being a separation agent.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This powder-based cooling and shaping laminating method adopts the method of spraying lubricating powder and uses the lubricating powder as a separating agent. On the one hand, it can greatly improve the situation where the plastic melt adheres to the surface of the composite cooling roller during the laminating and laminating process, effectively avoid the plastic melt from adhering to the molding equipment, and ensure its continuous molding. At the same time, it can improve the cooling and shaping effect of the laminating film and improve the production efficiency of the laminating film. On the other hand, it can effectively solve the problem of "blurring" during winding due to unevenness in the laminating and laminating process, so that the surface is smooth after winding.

[0021] The principle of the powder cooling and shaping laminating composite equipment is simple, and it can be improved on the basis of traditional laminating composite equipment by adding a special powder spraying device. The equipment transformation cost is low, and it is beneficial to control production costs on the basis of effectively improving the product molding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the principle of the coating composite equipment based on powder cooling and shaping.

[0023] Figure 2 for Figure 1 AA section view of the .

[0024] In the above figures, the components indicated by the respective reference numerals are as follows: 1 is an unwinding mechanism, 2 is a composite pressure roller, 3 is a composite cooling roller, 4 is a composite surface, 5 is a powder spraying device, 5-1 is a powder spraying roller, 5-2 is a powder spraying elastic line, 5-3 is a powder spraying roller reduction motor, 5-4 is a pulse collision assembly, 5-5 is a high voltage generator, 5-6 is a protective cover, 5-7 is a bracket, 6 is an extruder die head, 7 is a composite peeling roller, 8 is a cooling and shaping area, and 9 is a substrate. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0026] Example

[0027] This embodiment provides a laminating method and equipment based on powder cooling and shaping.

[0028] like Figure 1 As shown, the laminating method based on powder cooling and shaping includes the following steps:

[0029] (1) The unwinding mechanism 1 unwinds the substrate 9 and continuously feeds it into the composite surface 4 formed between the composite pressing roller 2 and the composite cooling roller 3. At the same time, the powder spraying device 5 located above the composite cooling roller continuously sprays the lubricating powder onto the surface of the composite cooling roller;

[0030] Among them, the specific process of the powder spraying device spraying lubricating powder onto the surface of the composite cooling roller is as follows: the lubricating powder is pre-placed in the inner cavity of the powder spraying roller 5-1, and the surface of the powder spraying roller is distributed with pits and grooves (not shown in the figure) which are connected to the inner cavity of the powder spraying roller, and the lubricating powder is embedded in the pits and grooves. During the rotation of the powder spraying roller, the powder spraying elastic line 5-2 periodically generates elastic force to the surface of the powder spraying roller, so that the lubricating powder is bounced off and sprayed onto the surface of the composite cooling roller. The rotation of the powder spraying roller is driven by a powder spraying roller reduction motor 5-3 connected to one end thereof, and the powder spraying elastic line is intermittently and regularly bounced to the surface of the powder spraying roller under the action of a pulse collision assembly 5-4 and a high-voltage generator 5-5 connected to one end thereof. After the lubricating powder is bounced off and sprayed onto the surface of the composite cooling roller, it rotates with the composite cooling roller. When it reaches the composite surface, one side of the coating is bonded to the substrate, and the other side of the coating is prevented from adhering to the surface of the composite cooling roller under the action of the lubricating powder. During the powder spraying process, a protective cover 5-6 is arranged on the periphery of the powder spraying roller, so that the lubricating powder falls onto the surface of the composite cooling roller within the range of the protective cover, thereby preventing the lubricating powder from excessively diffusing and affecting normal production.

[0031] The lubricating powder used is a granular substance such as corn starch, talcum powder, and white carbon black. According to the test, the lubricating powder will not affect the sealing strength of the coating layer. It adheres to the surface of the coating film and can also be used as a reinforcing agent for the elastomer, which is beneficial to improve the product performance. The substrate can be paper, film, non-woven fabric or mesh cloth, etc. The plastic melt is PBAT, PHA or POE, etc.

[0032] (2) The plastic melt is extruded above the composite surface through the extruder die head 6 and coated on the surface of the substrate, and then enters the composite surface for composite. During the composite process, one side of the plastic melt contacts the surface of the composite cooling roller;

[0033] (3) As the composite cooling roller rotates, the laminated composite material is cooled and shaped, and finally sent out through the composite stripping roller 7.

[0034] In the coating composite method, the method of spraying lubricant powder is adopted, and the lubricant powder is used as a separating agent. On the one hand, it can effectively prevent the coating from adhering to the molding equipment to ensure its continuous molding. On the other hand, it can effectively solve the problem of "blurring" during winding caused by unevenness during the coating process, so that the surface is smooth after winding.

[0035] This embodiment is used to implement the above-mentioned laminating and laminating method based on powder cooling and shaping laminating and laminating equipment, such as Figure 1 As shown, the device includes an unwinding mechanism 1, a composite pressure roller 2, a composite cooling roller 3 and a composite stripping roller 7 arranged along the substrate conveying direction. The junction of the composite pressure roller and the composite cooling roller forms a composite surface 4. An extruder die head for coating is arranged above the composite surface. A powder spraying device 5 is arranged above the composite cooling roller. The lower part of the composite cooling roller forms a cooling and shaping area 8 for the composite material. Among them, the unwinding mechanism unwinds the substrate and continuously delivers it to the composite surface formed between the composite pressure roller and the composite cooling roller. The powder spraying device sprays the lubricating powder on the surface of the composite cooling roller. The extruder die head coats the plastic melt on the surface of the substrate from top to bottom on the composite surface. The plastic melt coats the surface of the substrate and is composited at the composite surface. At the same time, under the action of the lubricating powder, the phenomenon of the plastic melt adhering to the surface of the composite cooling roller is avoided. After the plastic melt is composited with the substrate, it enters the cooling and shaping area for cooling and shaping as the composite cooling roller rotates, and is then sent out by the composite stripping roller.

[0036] The powder spraying device includes a bracket 5-7, a powder spraying roller 5-1, a powder spraying elastic line 5-2, a powder spraying roller reduction motor 5-3, a high voltage generator 5-5 and a pulse collision component 5-4. The powder spraying roller is installed above the composite cooling roller through the bracket. The powder spraying elastic line is arranged on the outer surface of the powder spraying roller facing the composite cooling roller. One end of the powder spraying roller is connected to the powder spraying roller reduction motor. One end of the powder spraying elastic line is connected to the pulse collision component and the high voltage generator in sequence. The powder spraying roller rotates continuously under the drive of the powder spraying roller reduction motor. The powder spraying elastic line is intermittently and regularly bounced to the surface of the powder spraying roller under the action of the pulse collision component and the high voltage generator.

[0037] Lubricating powder is pre-installed in the inner cavity of the powder spraying roller, and the surface of the powder spraying roller is distributed with pits and grooves (not shown in the figure) which are connected with the inner cavity of the powder spraying roller. The lubricating powder is embedded in the pits and grooves. Under the elastic force of the elastic wire, the lubricating powder falls from the pits and grooves and sprays onto the surface of the composite cooling roller.

[0038] The outer periphery of the powder spraying roller is also provided with a protective cover 5-6 to prevent the smooth powder from spreading excessively and affecting normal production. Figure 1 As shown, the upper part of the protective cover is rectangular, and the lower part of the protective cover is arranged in an eight-shaped shape from top to bottom. The powder spraying roller is located inside the protective cover, and the lower end of the protective cover extends close to the surface of the composite cooling roller, but there is a gap between the lower end of the protective cover and the surface of the composite cooling roller. Along the circumferential direction of the composite cooling roller, the arc length of the composite cooling roller covered by the lower end of the protective cover is 1 / 6 to 1 / 4 of the overall circumference of the composite cooling roller. Among them, the diameter of the powder spraying roller is much smaller than the diameter of the composite cooling roller. The powder spraying area of ​​the powder spraying roller should not be too large, otherwise it is easy to cause the smooth powder to spread excessively and affect normal production. The powder spraying area of ​​the powder spraying roller should not be too small, otherwise the powder spraying amount is too small and it is difficult to achieve the purpose of being a separation agent.

[0039] As described above, the present invention can be better implemented. The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention; that is, all equivalent changes and modifications made according to the content of the present invention are covered by the scope of protection required by the claims of the present invention.

Claims

1. A laminating method based on powder cooling and shaping, characterized in that: The following steps are involved: (1) The unwinding mechanism unwinds the substrate and continuously feeds it into the composite surface formed between the composite pressure roller and the composite cooling roller. At the same time, the powder spraying device located above the composite cooling roller continuously sprays the lubricating powder onto the surface of the composite cooling roller. The lubricating powder is used as a separating agent by spraying the lubricating powder. The specific process of the powder spraying device spraying the lubricating powder onto the surface of the composite cooling roller is as follows: the lubricating powder is pre-placed in the inner cavity of the powder spraying roller, and the surface of the powder spraying roller is distributed with pits and grooves communicating with the inner cavity of the powder spraying roller, and the lubricating powder is embedded in the pits and grooves. During the rotation of the powder spraying roller, the powder spraying elastic line generates elastic force to the surface of the powder spraying roller at a regular time, so that the lubricating powder is bounced off and sprayed onto the surface of the composite cooling roller; wherein, the rotation of the powder spraying roller is driven by the powder spraying roller reduction motor connected to one end thereof, and the powder spraying elastic line is intermittently and regularly bounced to the surface of the powder spraying roller under the action of the pulse collision component and the high-voltage generator connected to one end thereof, and after the lubricating powder is bounced off and sprayed onto the surface of the composite cooling roller, it rotates with the composite cooling roller, and when it reaches the composite surface, one side of the plastic melt coating is bonded to the substrate, and the other side of the plastic melt coating is prevented from adhering to the surface of the composite cooling roller under the action of the lubricating powder; (2) The plastic melt is extruded through the extruder die head above the composite surface and coated on the substrate surface, and then enters the composite surface for composite. During the composite process, one side of the plastic melt contacts the surface of the composite cooling roller; (3) As the composite cooling roller rotates, the composite material formed after compounding is cooled and shaped, and finally sent out through the composite peeling roller.

2. The laminating and compounding method based on powder cooling and shaping according to claim 1, characterized in that: During the powder spraying process, the protective cover arranged on the outer periphery of the powder spraying roller allows the lubricating powder to fall onto the surface of the composite cooling roller within the range of the protective cover.

3. The laminating and compounding method based on powder cooling and shaping according to claim 1, characterized in that: The slippery powder is corn starch, talcum powder or white carbon black.

4. The laminating and compounding method based on powder cooling and shaping according to claim 1, characterized in that: The substrate is paper, film, non-woven fabric or mesh cloth; the plastic melt is PBAT, PHA or POE.

5. The laminating and compounding equipment based on powder cooling and setting used in the laminating and compounding method according to any one of claims 1 to 4, characterized in that: It includes an unwinding mechanism, a composite pressure roller, a composite cooling roller and a composite stripping roller arranged along the conveying direction of the substrate. The junction of the composite pressure roller and the composite cooling roller forms a composite surface. An extruder die head for coating is arranged above the composite surface. A powder spraying device is arranged above the composite cooling roller. The lower part of the composite cooling roller forms a cooling and shaping area for the composite material.

6. The laminating and compounding equipment based on powder cooling and shaping according to claim 5 is characterized in that: The powder spraying device includes a bracket, a powder spraying roller, a powder spraying elastic line, a powder spraying roller reduction motor, a high-voltage generator and a pulse collision component. The powder spraying roller is installed above the composite cooling roller through the bracket. The powder spraying elastic line is arranged on the outer surface of the powder spraying roller facing the composite cooling roller. One end of the powder spraying roller is connected to the powder spraying roller reduction motor, and one end of the powder spraying elastic line is connected to the pulse collision component and the high-voltage generator in sequence.

7. The laminating and compounding equipment based on powder cooling and shaping according to claim 6 is characterized in that: The inner cavity of the powder spraying roller is pre-set with lubricating powder, and the surface of the powder spraying roller is provided with pits and grooves communicating with the inner cavity of the powder spraying roller, and the lubricating powder is embedded in the pits and grooves.

8. The laminating and compounding equipment based on powder cooling and shaping according to claim 6 is characterized in that: A protective cover is also provided on the periphery of the powder spraying roller. The upper part of the protective cover is rectangular, and the lower part of the protective cover is arranged in an eight-shaped shape from top to bottom. The powder spraying roller is located in the protective cover, and the lower end of the protective cover extends close to the surface of the composite cooling roller, but a gap is left between the lower end of the protective cover and the surface of the composite cooling roller.

9. The laminating and compounding equipment based on powder cooling and shaping according to claim 8 is characterized in that: Along the circumferential direction of the composite cooling roller, the arc length of the composite cooling roller covered by the lower end of the protective cover is 1 / 6 to 1 / 4 of the overall circumference of the composite cooling roller.

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