High-temperature-resistant solvent-resistant leather release paper preparation equipment and process thereof

Abstract

The high-temperature-resistant solvent-resistant leather release paper preparation equipment comprises a pretreatment mechanism, a film coating mechanism, a cooling mechanism, a polishing mechanism and a press polish mechanism, a platform is arranged at the top of the pretreatment mechanism, a support is connected to the platform in a lifting mode, and at least one pair of scratching devices is arranged on the support; each scratching device comprises a moving seat, a tool apron and a plurality of scratching tools, the film covering mechanism comprises a storage barrel, a partition plate is arranged in the storage barrel, a pair of air knife mechanisms is arranged in the storage barrel on one side of the partition plate, the cooling mechanism comprises a plurality of sets of cooling rollers, the polishing mechanism comprises a plurality of pairs of carrier rollers and polishing rollers, and the calendaring mechanism comprises a plurality of pairs of calendaring rollers. The invention also discloses a corresponding preparation process, the industrial batch production of the high-temperature-resistant solvent-resistant leather release paper can be realized, the prepared release paper is firmer and tear-resistant, the release paper is not easy to deform after being soaked in a solvent for a long time in a high-temperature environment, the pattern transfer effect can be ensured, and the release paper can be repeatedly used for multiple times.

Description

Technical Field

[0001] This invention relates to a high-temperature resistant and solvent-resistant leather release paper preparation equipment and process. Background Technology

[0002] The main function of leather release paper is to transfer the patterns or textures set on the release paper to the leather base fabric so that the leather can obtain the corresponding patterns; release paper using the transfer coating method can generally be reused;

[0003] In practical applications, some special printing or texture coatings need to be soaked in solvents for a long time in a high-temperature environment to achieve a good transfer effect. In this environment, the release paper in the existing technology is prone to deformation. At the same time, due to the penetration of solvent, the release paper also becomes fragile and easily torn, resulting in poor pattern transfer effect and the release paper cannot be reused. Therefore, it is necessary to improve the production process of release paper and develop corresponding preparation equipment to enable industrial mass production. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-temperature and solvent-resistant leather release paper preparation equipment and process, which can mass-produce high-temperature and solvent-resistant leather release paper.

[0005] The technical solution of the present invention is: a high-temperature and solvent-resistant leather release paper preparation device, comprising a pretreatment mechanism, a coating mechanism, a cooling mechanism, a polishing mechanism and a calendering mechanism;

[0006] The pretreatment mechanism is equipped with a platform at the top, and a support is lifted and connected to the platform. At least one pair of scratching devices are provided on the support, and the raw paper to be processed passes through the platform longitudinally.

[0007] Each of the aforementioned scratching devices includes a movable base, a blade holder, and multiple scratching blades. Each scratching blade is needle-shaped. The scratching blades are arranged in a row and are equally spaced at the bottom of the blade holder. The blade holder is lifted and connected to the bottom of the movable base. The two movable bases in the same pair of scratching devices move laterally on the support in an alternating manner.

[0008] When the raw paper passes through the platform at a constant speed, the two moving seats in the same pair of scratching devices move in an alternating and reciprocating manner, so that the two sets of scratching knives scratch a grid-like pattern on the top surface of the raw paper. The knife seats also intermittently rise and fall to make the scratching knives punch holes in the raw paper.

[0009] The film coating mechanism comprises a storage cylinder, a liquid film coating material is arranged in the lower end of the storage cylinder, a partition plate is further arranged in the storage cylinder, the top of the partition plate is connected to the top of the storage cylinder, the bottom of the partition plate extends into the film coating material, a feeding port is arranged on the storage cylinder at one side of the partition plate, a pair of air knife mechanisms are arranged in the storage cylinder at the other side of the partition plate, a discharging port is arranged at the top of the storage cylinder, and a guide mechanism is further arranged on the storage cylinder; the raw paper subjected to scratch treatment is guided by the guide mechanism, immersed into the film coating material through the feeding port, and then output from the discharging port between the two air knife mechanisms upward.

[0010] The air flow sprayed by the two air knife mechanisms blows off the excess film coating material back to the lower end of the storage cylinder, and makes the film coating material fully adhere to the scratches and through holes of the raw paper, so that a film coating layer is formed on the front and back surfaces of the raw paper, and the two film coating layers are connected through the film coating material in the through holes.

[0011] The cooling mechanism comprises a plurality of cooling rollers.

[0012] The polishing mechanism comprises a plurality of pairs of supporting rollers and polishing rollers, each polishing roller is provided with a ground layer, the mesh number of each ground layer is increased in sequence, and the film coating layer on the top surface of the raw paper after film coating is polished away between each pair of supporting rollers and polishing rollers, so that the top surface of the raw paper and the film coating material solidified and distributed in the scratches in a grid shape are exposed.

[0013] The calendering mechanism comprises a plurality of pairs of calendering rollers.

[0014] Further, the bracket is a "concave" bracket, the bottom of the bracket is located below the platform, the two sides of the bracket protrude from the two sides of the platform, the bracket is provided with guide rods corresponding to each moving seat, the moving seat is provided with guide holes corresponding to the guide rods, the moving seat is slidingly connected to the corresponding guide rods, and one end of the bracket is further provided with a first screw rod mechanism for driving the moving seat to reciprocatingly displace.

[0015] Further, the pre-treatment mechanism is provided with a plurality of vertical columns at the two sides respectively, the bracket is provided with holes corresponding to each vertical column, each vertical column passes through the corresponding hole, and a second screw rod mechanism driven by a servo motor is further arranged below the bracket, and the end of the screw rod of the second screw rod mechanism is rotationally connected to the bottom of the bracket.

[0016] Further, the platform is further swingably connected with a tensioning roller at each side.

[0017] Further, the bottom of the storage cylinder is further provided with a constant-temperature heating device, the two air knife mechanisms are fixed on a frame body and arranged close to the top of the storage cylinder, a return air port is further arranged in the storage cylinder below the frame body, the return air port maintains a distance from the liquid level in the storage cylinder, and the return air port is connected with a filtering device through a connecting pipe.

[0018] Specifically, the plurality of cooling rollers are divided into an upper cooling roller group and a lower cooling roller group.

[0019] Further, each pair of the supporting roller and the polishing roller is arranged in a shell, and the front end and the rear end of each shell are respectively provided with an inlet and an outlet.

[0020] Further, the top of the platform is further provided with a rubber layer with smooth surface.

[0021] A preparation process of high-temperature-resistant and solvent-resistant leather release paper, comprising the following steps:

[0022] Step one, grid-shaped scratches are processed on the top surface of the thickened base paper, and punching is performed on the base paper;

[0023] Step two, the front and back surfaces of the base paper are coated, and it is ensured that the coating layer penetrates into the scratches and the through holes;

[0024] Step three, cooling is performed to solidify the coating layer;

[0025] Step four, the top surface of the base paper after coating is polished, and the coating layer on the top surface of the base paper is removed, so that the top surface of the base paper and the coating material solidified and distributed in the scratches in a grid shape are exposed;

[0026] Step five, the polished base paper is calendered, and low-pressure steam is sprayed to the top surface of the base paper during the calendering process;

[0027] Step six, a layer of release agent is coated on the top surface of the calendered base paper, and the finished product is obtained after low-temperature drying and winding.

[0028] In the above process, the thickness of the thickened base paper is 0.2 mm, the depth of the scratches is controlled to be 0.03-0.1 mm, and the coating layer is a polytetrafluoroethylene layer.

[0029] The beneficial effects of the present application are: the product with the back coating layer and the front grid-shaped coating layer is prepared by scratching, coating and polishing on the base paper of the release paper, the back coating layer and the grid-shaped coating layer of the base paper are connected through the coating material in the through holes, and the two coating layers are not easy to fall off; in this way, the base paper is more firm and resistant to tearing, and is not easy to deform when soaked in a solvent for a long time in a high-temperature environment, which can ensure the effect of pattern transfer and make the release paper reusable multiple times;

[0030] The preparation equipment in the application can quickly and accurately process grid-shaped scratches on the top surface of the base paper in the pretreatment mechanism; the film coating mechanism can quickly coat the base paper, and the air knife can make the coating material fully adhere to the scratches and the through holes in the base paper, and can accelerate the solidification of the coating layer; the polishing rollers with gradually increasing mesh numbers are arranged to gradually polish the coating layer on the top surface of the base paper, so that the top surface of the base paper and the coating material solidified and distributed in the scratches in a grid shape are exposed, and the adhesion of the release agent is facilitated; finally, the base paper is subjected to calendering treatment, so that the surface of the base paper is smooth, and the industrialized batch production of the high-temperature-resistant and solvent-resistant leather release paper is realized. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic diagram of the application;

[0032] Figure 2 is a structural schematic diagram of the pretreatment mechanism in the application;

[0033] Figure 3 is a sectional view of the pretreatment mechanism in the application;

[0034] Figure 4 is a structural schematic diagram of the film coating mechanism in the application;

[0035] Figure 5 is a structural schematic diagram of the scratch device in the application;

[0036] Figure 6 is a sectional view of the product in the application;

[0037] Figure 7 is a structural schematic diagram of the top surface of the product in the application.

[0038] In the figure: the pretreatment mechanism 1, the film coating mechanism 2, the cooling mechanism 3, the polishing mechanism 4, the calendering mechanism 5, the platform 6, the support 7, the scratch device 8, the base paper 9, the moving seat 10, the cutter seat 11, the scratch cutter 12, the storage cylinder 13, the partition plate 14, the air knife mechanism 15, the air return port 16, the grid-shaped coating layer 17, the coating layer 18, the first lead screw mechanism 19, the stand column 20, the second lead screw mechanism 21, the constant-temperature heating device 22, the guide rod 23, the tensioning roller 24, and the release agent layer 25. DETAILED DESCRIPTION

[0039] The technical solutions of the application will be further specifically described below by means of examples in combination with the drawings.

[0040] In combination with Figures 1-5 the drawing, a high-temperature-resistant and solvent-resistant leather release paper preparation equipment includes a pretreatment mechanism 1, a film coating mechanism 2, a cooling mechanism 3, a polishing mechanism 4, and a calendering mechanism 5.

[0041] The pre-treatment mechanism 1 is provided with a platform 6 on the top, a support 7 is connected to the platform 6, at least one pair of scratch devices 8 is arranged on the support 7, and the raw paper 9 to be treated passes through the platform 6 longitudinally, and the bottom of the raw paper 9 abuts against the platform 6;

[0042] Each of the scratch devices 8 comprises a moving seat 10, a knife seat 11 and a plurality of scratch knives 12, each of the scratch knives 12 is needle-shaped, the scratch knives 12 are arranged in a row and are equidistantly arranged at the bottom of the knife seat 11, the knife seat 11 is connected to the bottom of the moving seat 10 in a lifting manner, and the two moving seats 10 in the same pair of scratch devices 8 are transversely moved on the support 7 in an interlaced manner;

[0043] When the raw paper 9 passes through the platform 6 at a constant speed, the two moving seats 10 in the same pair of scratch devices 8 are uniformly displaced in an interlaced and reciprocating manner, so that the two groups of scratch knives 12 scratch the top surface of the raw paper 9 to form a grid-shaped scratch in an interlaced manner, and the knife seat 11 is lifted and lowered intermittently to make the scratch knives 12 punch holes on the raw paper 9;

[0044] In the above structure, the needle-shaped scratch knives 12 can slide on the raw paper 9 in any direction with the movement of the moving seat 10, and the punching operation is facilitated, and the top of the platform 6 is further provided with a rubber layer with a smooth surface;

[0045] The film coating mechanism 2 comprises a storage cylinder 13, the storage cylinder 13 is provided with liquid film coating material at the lower end, a partition plate 14 is further arranged in the storage cylinder 13, the top of the partition plate 14 is connected to the top of the storage cylinder 13, the bottom of the partition plate 14 extends into the film coating material, a feeding port is arranged on the storage cylinder 13 at one side of the partition plate 14, a pair of air knife mechanisms 15 are arranged in the storage cylinder 13 at the other side of the partition plate 14, a discharging port is arranged at the top of the storage cylinder 13, and a guide mechanism is further arranged on the storage cylinder 13, the raw paper 9 treated by scratching is guided by the guide mechanism, immersed into the film coating material through the feeding port, and then output from the discharging port between the two air knife mechanisms 15;

[0046] The raw paper 9 is immersed into the film coating material to coat the front and back surfaces, when the raw paper 9 after coating passes between the two air knife mechanisms 15, the air knife mechanisms 15 blow air flow to blow off the excess film coating material back to the lower end of the storage cylinder 13, and make the film coating material fully adhere to the scratches and through holes of the raw paper 9, and at the same time, form a layer of film coating layer 18 on the front and back surfaces of the raw paper 9, and the two layers of film coating layers 18 are connected through the film coating material in the through holes; in addition, the air flow blown by the air knife mechanisms 15 is discharged through the air return port 16 at the same side, without affecting the input and coating of the raw paper 9 at the other side of the partition plate 14;

[0047] The cooling mechanism 3 comprises multiple groups of cooling rollers, and the coated paper 9 abuts against each group of cooling rollers in sequence to completely cool and solidify the film layer 18;

[0048] The polishing mechanism 4 comprises multiple pairs of supporting rollers and polishing rollers, each polishing roller is provided with an abrasive layer, the mesh number of each abrasive layer increases in sequence, and the film layer 18 on the top surface of the coated paper 9 is polished away between each pair of supporting rollers and polishing rollers, so that the top surface of the coated paper 9 and the grid-shaped film material solidified and distributed in the scratches are exposed, and then the top surface of the coated paper 9 and the end surface of the grid-shaped film material exposed on the top surface of the coated paper 9 gradually become smooth with the increase of the mesh number of the end abrasive layer;

[0049] The calendering mechanism 5 comprises multiple pairs of calendering rollers, and the polished coated paper 9 is subjected to calendering treatment by each pair of calendering rollers to obtain the final product;

[0050] In combination with Figure 6 and Figure 7 , the top surface of the final product is smooth and embedded with the grid-shaped film layer 17, the back surface also has the film layer 18, and the grid-shaped film layer 17 on the top surface is also connected with the film layer 18 on the back surface through the material solidified in the through hole, so that the grid-shaped film layer 17 and the film layer 18 on the back surface are not easy to be separated from the coated paper 9; in this way, a grid-shaped framework is equivalent to being arranged on the coated paper 9, so that the coated paper 9 is more firm and resistant to tearing, and is not easy to deform when soaked in a solvent for a long time in a high-temperature environment, which can ensure the effect of pattern transfer and make the release paper reusable multiple times.

[0051] In another embodiment, in combination with Figure 2 and Figure 3 , the bracket 7 is a "concave" bracket, the bottom of the bracket 7 is located below the platform 6, the two sides of the bracket 7 protrude from the two sides of the platform 6, the bracket 7 is provided with a guide rod 23 corresponding to each moving seat 10, the moving seat 10 is provided with a guide hole corresponding to the guide rod 23, the moving seat 10 is slidingly connected to the corresponding guide rod 23, and the bracket 7 is further provided with a first lead screw mechanism 19 at one end to drive the moving seat 10 to reciprocate. In the above structure, the bracket 7 does not excessively block the top surface of the platform 6, which is convenient for observing the scratch effect on the top surface of the coated paper 9 at any time, and the guide rod 23 ensures the stability of the moving seat 10 during displacement.

[0052] In another embodiment, in combination with Figure 2 and Figure 3As shown, the pre-processing mechanism 1 is provided with a plurality of columns 20 on both sides, the bracket 7 is provided with holes corresponding to each column 20, each column 20 passes through the corresponding hole, and a second lead screw mechanism 21 driven by a servo motor is further provided below the bracket 7, the end of the second lead screw mechanism 21 is rotatably connected with the bottom of the bracket 7, so as to accurately control the height of the bracket 7, and further accurately control the depth of the scratches on the raw paper 9.

[0053] In another embodiment, in combination with Figure 2 and Figure 3 As shown, the platform 6 is further swing-connected with a tensioning roller 24 on both sides, so as to tension the raw paper 9 on the platform 6 when passing through, so as to avoid displacement or floating of the raw paper 9, and further ensure the accuracy of the scratches.

[0054] In another embodiment, as shown in Figure 4 The bottom of the storage cylinder 13 is further provided with a constant temperature heating device 22, so as to keep the film material in a molten state, and the two air knife mechanisms 15 are fixed on a frame and arranged close to the top of the storage cylinder 13, a return air inlet 16 is further provided in the storage cylinder 13 below the frame, the return air inlet 16 is spaced from the liquid level in the storage cylinder 13, and the return air inlet 16 is connected with a filtering device through a connecting pipe, so as to filter out the material particles possibly contained in the discharged air.

[0055] In another embodiment, the plurality of cooling rollers are divided into upper cooling roller groups and lower cooling roller groups, so as to respectively cool the film layers 18 on the front and back surfaces of the raw paper 9.

[0056] In another embodiment, as shown in Figure 1 Each pair of supporting rollers and polishing rollers in the polishing mechanism 4 is arranged in a shell, the front and rear ends of each shell are respectively provided with an inlet and an outlet, and each shell is further connected with a dust suction pipe, and each polishing roller is independently arranged, so as to avoid the debris generated in the polishing process from drifting to the raw paper 9 in front or behind to affect the polishing effect, and the dust suction pipe is arranged to suck out the debris in real time, so as to avoid dust from diffusing in the workshop.

[0057] A preparation process of high-temperature-resistant and solvent-resistant leather release paper, comprising the following steps:

[0058] Step one, grid-shaped scratches are processed on the top surface of the thickened raw paper, and holes are punched on the raw paper;

[0059] Step two, film layers are coated on the front and back surfaces of the raw paper, and it is ensured that the film layers penetrate into the scratches and the through holes;

[0060] Step three, cooling to solidify the film layers;

[0061] Step four, polishing the top surface of the base paper with film, grinding off the film layer on the top surface of the base paper, exposing the top surface of the base paper and the film material solidified in a grid shape in the scratches;

[0062] The main purpose of grinding off the film layer on the top surface of the base paper is to expose the base paper and better attach the release agent, and the film material infiltrated in the scratches and through holes is retained due to the polishing depth, forming a grid-shaped skeleton, and further improving the performance of the base paper.

[0063] Step five, calendering the polished base paper, and spraying low-pressure steam to the top surface of the base paper during the calendering process;

[0064] Step six, covering the top surface of the calendered base paper with a layer of release agent, drying at low temperature, and then winding to obtain the finished product.

[0065] Specifically, the thickened base paper 9 has a thickness of 0.2 mm, the depth of the scratches is controlled to be 0.03-0.1 mm, and the film layer is a polytetrafluoroethylene layer.

Claims

1. A device for preparing high-temperature resistant and solvent-resistant leather release paper, characterized in that, It includes a pretreatment mechanism (1), a coating mechanism (2), a cooling mechanism (3), a polishing mechanism (4), and a calendering mechanism (5); The pretreatment mechanism (1) is provided with a platform (6) on top, and a support (7) is connected to the platform (6) for lifting. At least one pair of scratching devices (8) are provided on the support (7), and the raw paper (9) to be processed passes through the platform (6) longitudinally. Each of the scratching devices (8) includes a movable seat (10), a blade holder (11), and multiple scratching blades (12). Each scratching blade (12) is needle-shaped. The scratching blades (12) are arranged in a row and are equally spaced at the bottom of the blade holder (11). The blade holder (11) is lifted and connected to the bottom of the movable seat (10). The two movable seats (10) in the same pair of scratching devices (8) move laterally on the bracket (7) in an alternating manner. When the paper (9) passes through the platform (6) at a constant speed, the two moving seats (10) in the same pair of scratching devices (8) move in an alternating and reciprocating manner, so that the two sets of scratching knives (12) scratch a grid-like pattern on the top surface of the paper (9). The knife seats (11) also intermittently rise and fall to make the scratching knives (12) punch holes in the paper (9). The coating mechanism (2) includes a storage cylinder (13), the lower end of which is provided with liquid coating material. The storage cylinder (13) is also provided with a partition (14), the top of which is connected to the top of the storage cylinder (13), and the bottom of which extends into the coating material. The storage cylinder (13) on one side of the partition (14) is provided with an inlet, and the storage cylinder (13) on the other side of the partition (14) is provided with a pair of air knife mechanisms (15). The top of the storage cylinder (13) is provided with an outlet, and the storage cylinder (13) is also provided with a guide mechanism. The scratched base paper (9) is immersed in the coating material through the inlet under the guidance of the guide mechanism, and then output through the outlet between the two air knife mechanisms (15). The two air knife mechanisms (15) spray out airflow to blow the excess coating material back to the lower end of the storage cylinder (13) and make the coating material fully adhere to the scratches and through holes of the base paper (9). At the same time, the coating material forms a coating layer (18) on the front and back of the base paper (9) respectively. The two coating layers (18) are connected by the coating material in each through hole. The cooling mechanism (3) includes multiple sets of cooling rollers; The grinding mechanism (4) includes multiple pairs of idlers and grinding rollers. Each grinding roller has a frosted layer on its outer periphery. The mesh count of each frosted layer increases sequentially. The coated paper (9) passes between each pair of idlers and grinding rollers to remove the coating layer (18) on the top surface, exposing the top surface of the paper (9) and the coating material that is solidified in a grid pattern within the scratches. The calendering mechanism (5) includes multiple pairs of calendering rollers.

2. The equipment for preparing high-temperature resistant and solvent-resistant leather release paper as described in claim 1, characterized in that, The bracket (7) is a U-shaped bracket. The bottom of the bracket (7) is located below the platform (6). The two sides of the bracket (7) protrude from the two sides of the platform (6). The bracket (7) is provided with guide rods (23) corresponding to each movable seat (10). The movable seat (10) is provided with guide holes corresponding to the guide rods (23). The movable seat (10) is slidably connected to the corresponding guide rods (23). One end of the bracket (7) is also provided with a first screw mechanism (19) to drive the movable seat (10) to move back and forth.

3. The equipment for preparing high-temperature resistant and solvent-resistant leather release paper as described in claim 2, characterized in that, The pretreatment mechanism (1) has multiple columns (20) on both sides. The bracket (7) has holes corresponding to each column (20). Each column (20) passes through the corresponding hole. The bracket (7) also has a second lead screw mechanism (21) driven by a servo motor below it. The lead screw end of the second lead screw mechanism (21) is rotatably connected to the bottom of the bracket (7).

4. The equipment for preparing high-temperature resistant and solvent-resistant leather release paper as described in claim 3, characterized in that, A tension roller (24) is also oscillatingly connected to each side of the platform (6).

5. The equipment for preparing high-temperature resistant and solvent-resistant leather release paper as described in claim 4, characterized in that, The bottom of the storage cylinder (13) is also provided with a constant temperature heating device (22). The two air knife mechanisms (15) are fixed on the frame and set near the top of the storage cylinder (13). The storage cylinder (13) below the frame is also provided with a return air port (16). The return air port (16) is kept at a distance from the liquid level in the storage cylinder (13). The return air port (16) is connected to the filter device through a connecting pipe.

6. The equipment for preparing high-temperature resistant and solvent-resistant leather release paper as described in claim 5, characterized in that, The cooling rollers are divided into upper cooling roller group and lower cooling roller group.

7. The equipment for preparing high-temperature resistant and solvent-resistant leather release paper as described in claim 6, characterized in that, In the grinding mechanism (4), each pair of rollers and grinding rollers are respectively installed in a housing. Each housing has an inlet and an outlet at its front and rear ends, and each housing is also connected to a dust suction pipe.

8. The equipment for preparing high-temperature resistant and solvent-resistant leather release paper as described in claim 7, characterized in that, The platform (6) is also provided with a smooth rubber layer on top.

9. A preparation process for high-temperature and solvent-resistant leather release paper, characterized in that, Includes the following steps: Step 1: Create a grid-like pattern on the top surface of the thickened base paper and punch holes in the base paper; Step 2: Apply a film to both sides of the base paper, ensuring that the film penetrates into the scratches and through-holes; Step 3: Cooling to cure the coating layer; Step 4: Sand the top surface of the coated paper to remove the coating layer, exposing the top surface of the paper and the coating material that is solidified in a grid pattern within the scratches. Step 5: Calender the sanded base paper, spraying low-pressure steam onto the top surface of the base paper during the calendering process; Step 6: Apply a layer of release agent to the top surface of the calendered base paper, dry it at low temperature, and then roll it up to obtain the finished product.

10. The preparation process of a high-temperature resistant and solvent-resistant leather release paper as described in claim 9, characterized in that, The thickness of the thickened base paper is 0.2 mm, the depth of the scratch is controlled between 0.03 and 0.1 mm, and the coating layer is a polytetrafluoroethylene layer.

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