A method and device for painting colored polytetrafluoroethylene patterns

Abstract

The invention discloses a method for painting a colored polytetrafluoroethylene pattern and a painting device thereof, belonging to the technical field of pattern printing. The colored slurry is painted on a non-stick coating layer. The colored slurry is placed in a curved printing plate with an arc-shaped cross section. The inner curved surface of a kitchenware with a non-stick coating layer contacts the printing surface of the curved printing plate. The center line of the kitchenware coincides with the center line of the length direction of the curved printing plate, so that the kitchenware can contact the printing surface of the curved printing plate when moving and can drive the curved printing plate to rotate in the positive direction along the axis of the curved printing plate. The kitchenware moves, and a scraper slides along the curved printing plate in a direction opposite to the rotation direction of the curved printing plate, so that the colored slurry is coated on the non-stick coating layer of the kitchenware. The invention can print a pattern or a trademark on the inner wall or the non-stick coating layer through the cooperation of the curved printing plate and the scraper, and the printed pattern is uniform and flat.

Description

Technical Field

[0001] The invention relates to the technical field of pattern printing, and in particular to a method for painting a colored polytetrafluoroethylene pattern and a painting device thereof. Background Art

[0002] Trademarks are essential auxiliary material marks for products on the market, and their function is to provide consumers with relevant information about the manufacturer of the product. Kitchenware includes pots, bowls, and other kitchenware that need to be in contact with oil smoke for a long time, such as barbecue grills, etc. The trademarks or other identifying patterns on their surfaces are easily attached by grease, becoming blurred or falling off, and losing their identification.

[0003] Polytetrafluoroethylene (PTFE) has the characteristics of "non-stick" and "self-cleaning" due to the tetrafluorohalogen substituents contained in its polymer units, that is, it is both water- and oil-resistant, and is heat-resistant and solvent-resistant, and has stable chemical properties. Using PTFE-based coatings to print logo patterns on kitchenware can keep the patterns clear and recognizable for a long time, but there are still the following problems: 1. With the popularity of non-stick coatings, many kitchenware already have a layer of non-stick coating. Since the non-stick coating is "non-sticky" and has an extremely low surface friction coefficient, it is difficult to continue printing colored non-stick coatings on the surface of the non-stick coating; 2. Most kitchenware is round or spherical, and the patterns on its inner surface or inside are not easy to print. Summary of the invention

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a method for painting a colored polytetrafluoroethylene pattern, which is characterized by comprising the following steps:

[0005] S1. Preparation of colored slurry: adding pigment to polytetrafluoroethylene slurry and mixing evenly to obtain colored slurry;

[0006] S2. Applying colored slurry on the non-stick layer: Place the colored slurry in a curved printing plate with an arc-shaped cross section, the inner curved surface of the kitchenware with the non-stick coating contacts the printing surface of the curved printing plate, the center line of the kitchenware coincides with the center line of the length direction of the curved printing plate, so that when the kitchenware moves, it can contact the printing surface of the curved printing plate and drive the curved printing plate to rotate in the positive direction along the axis of the curved printing plate. The kitchenware moves, and the scraper slides along the curved printing plate. The sliding direction of the scraper is opposite to the rotation direction of the curved printing plate, and the sliding direction of the scraper is opposite to the movement direction of the kitchenware. Apply the colored slurry On the non-stick coating of kitchenware, the inner arc surface of the kitchenware with non-stick coating to be printed is always in contact with the printing surface of the arc printing plate, and the center line of the kitchenware coincides with the center line of the length direction of the arc printing plate, which can maximize the contact area and increase the contact surface, so as to ensure that the printed colored non-stick pattern is uniform and flat; the inner wall of most round tableware or kitchenware is spherical, and the arc printing plate and the scraper can print the pattern or trademark on the inner wall, and the surface of the pattern printed by the colored polytetrafluoroethylene slurry itself is non-stick, and the pattern itself is not easily contaminated by oil smoke, and can remain easily recognizable for a long time;

[0007] S3. Colored slurry curing: Place the kitchenware coated with the colored slurry into a heating device for drying and curing for 10 min to 30 min at a curing temperature of 280°C to 430°C.

[0008] Preferably, the pigment is an edible pigment, and the pigment is different in color from the existing non-stick coating of the kitchenware.

[0009] Preferably, the polytetrafluoroethylene slurry is commercially available food-grade polytetrafluoroethylene slurry.

[0010] Preferably, the radius of the curved printing plate is smaller than the radius of the kitchenware to be printed. The inner wall of most round tableware or kitchenware is a spherical surface. Although the cross section of the curved printing plate is curved, the longitudinal section of the stretched screen in the curved printing plate is actually straight. When the screen of the curved printing plate contacts the spherical inner wall of the tableware or kitchenware, there is a gap between the two, which will cause printing failure. Based on this, the radius of the curved printing plate is smaller than the radius of the kitchenware, so that when the two sides of the curved printing plate contact the inner curved surface of the kitchenware or tableware, the gap between the printing surface of the curved printing plate and the inner curved surface of the kitchenware is reduced, thereby facilitating the transfer of the pattern on the curved printing plate to the inner curved surface of the kitchenware. At the same time, the contact surface between the scraper and the curved printing plate is a curved surface, and the curved surface of the scraper is smaller than or equal to the radius of the inner curved surface of the kitchenware to be printed. The scraper has a curved surface, and the arc radius of the scraper is smaller than or equal to the radius of the inner curved surface of the kitchenware to be printed, which can further reduce the gap between the printing surface of the curved printing plate and the inner curved surface of the kitchenware, making it easier to paint.

[0011] Another object of the present invention is to provide a brushing device for colored polytetrafluoroethylene patterns, characterized in that it includes an arc-shaped printing plate and a bracket, a fixed seat is provided on the top of the bracket, the arc-shaped printing plate is rotatably arranged on the fixed seat, a scraper matching the arc-shaped printing plate is provided inside the arc-shaped printing plate, the scraper is rotatably connected to the fixed seat, a scraper is provided at one end of the scraper close to the arc-shaped printing plate, and a first connecting rod rotatably connected to the scraper is provided at the end away from the arc-shaped printing plate, an L-shaped second connecting rod is rotatably provided at the end of the first connecting rod away from the scraper, and the corner portion of the second connecting rod is rotatably connected to the bottom of the bracket through the first bracket, a third connecting rod rotatably connected to the first supporting seat is provided on the first supporting seat, and a fourth connecting rod connecting the second connecting rod and the third connecting rod is rotatably provided at the end of the second connecting rod away from the first connecting rod, a pull rod is provided on the fourth connecting rod, and a connecting block is provided at the end of the pull rod away from the fourth connecting rod.

[0012] Preferably, a lifting platform slidably connected to the bracket is provided at the bottom of the bracket, a guide groove is provided on the lifting platform, and a positioning line is provided in the guide groove.

[0013] Preferably, the cross-section of the arc-shaped printing plate is fan-shaped, a positioning hole is provided on the side wall of the arc-shaped printing plate, a second support is provided on the brackets on both sides of the fixed seat, an adjusting rod rotatably connected to the second support is provided on the second support, a limiting rod is provided at one end of the adjusting rod close to the positioning hole, and a rotating motor for driving the adjusting rod to rotate is provided at the end away from the positioning hole.

[0014] Preferably, the scraper has an L-shaped cross-section, and slide grooves are provided on both sides of the scraper along the length direction of the scraper. A polished rod is provided at the end of the scraper away from the arc-shaped printing plate. The scraper is slidably connected to the scraper through the slide groove and the polished rod, and a spring is sleeved on the polished rod.

[0015] Preferably, the pull rod includes a connecting section and a connecting section 2, the connecting section 2 is perpendicular to the fourth connecting rod, the end of the connecting section 2 away from the fourth connecting rod is sleeved on the connecting section 1, the end of the connecting section 1 away from the connecting section 2 is provided with a connecting block, and a plurality of through holes are evenly arranged on the connecting section 2.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention uses a pattern printed with a colored polytetrafluoroethylene slurry to form a logo, the surface of the polytetrafluoroethylene itself is non-sticky, the pattern itself is not easily contaminated by oil smoke, and can remain easily recognizable for a long time; 2. The present invention can print a pattern or trademark on the inner wall and on the spherical surface through the combination of an arc-shaped printing plate and a scraper, and the printed pattern is uniform and flat; 3. By adjusting the initial position of the arc-shaped printing plate and the length of the pull rod, the present invention is also suitable for flat printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a first use state of a device for painting colored polytetrafluoroethylene patterns provided by an embodiment of the present invention.

[0019] Figure 2 A structural side sectional view of a device for painting a colored polytetrafluoroethylene pattern provided in an embodiment of the present invention.

[0020] Figure 3 for Figure 2 Enlarged view of part A in the middle.

[0021] Figure 4 A partial structural schematic diagram of a device for painting colored polytetrafluoroethylene patterns provided in an embodiment of the present invention.

[0022] Figure 5 for Figure 4 Schematic diagram of the structure in which the rotating motor and the second support are removed.

[0023] Figure 6 A schematic diagram of the scraper structure of a device for painting colored polytetrafluoroethylene patterns provided in an embodiment of the present invention.

[0024] Figure 7 for Figure 1 A partial structural schematic diagram of a second usage state of a device for painting colored polytetrafluoroethylene patterns provided by an embodiment of the present invention.

[0025] Explanation of the accompanying drawings: 1. arc-shaped printing plate; 2. scraper; 21. scraper; 22. slide groove; 23. light rod; 24. spring; 3. first connecting rod; 4. second connecting rod; 5. third connecting rod; 61. pull rod; 611. connecting section one; 612. connecting section two; 62. connecting block; 7. lifting platform; 71. guide groove; 72. positioning line; 8. first support; 9. adjusting rod; 91. limit rod; 92. rotating motor; 10. second support; 11. positioning hole; 12. bracket; 13. fixing seat; 14. pot. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1: Figures 1 to 7 As shown, the present invention provides a brushing device for a colored polytetrafluoroethylene pattern, comprising an arc-shaped printing plate 1 and a bracket 12, a fixing seat 13 is provided on the top of the bracket 12, the arc-shaped printing plate 1 is rotatably arranged on the fixing seat 13, a scraper 2 matched with the arc-shaped printing plate 1 is provided in the arc-shaped printing plate 1, the scraper 2 is rotatably connected to the fixing seat 13, the arc-shaped printing plate 1 and the scraper 2 rotate coaxially, the arc-shaped printing plate 1 is a printing plate obtained by bending a commonly used planar screen printing plate into an arc-shaped printing plate, the screen printing plate is a prior art, and is not described in detail here, a scraper 21 is provided at one end of the scraper 2 close to the arc-shaped printing plate 1, and a first connecting rod 3 rotatably connected to the scraper 2 is provided at one end away from the arc-shaped printing plate 1, the first connecting rod 3 is directly or indirectly connected to the driving device to drive the scraper 2 to rotate, the first connecting rod 3 is rotatably provided at one end away from the scraper 2 with an L-shaped second connecting rod 4, and the corner of the second connecting rod 4 is connected to the bracket 1 through the first support 8. 2 is rotatably connected at the bottom, the corner of the second connecting rod 4 is directly connected to the driving device, the end of the bottom of the bracket 12 away from the fixed seat 13 is provided with a first support 8, the second connecting rod 4 is rotatably connected to the bracket 12 through the first support 8, a third connecting rod 5 rotatably connected to the first support 8 is provided on the first support 8, the end of the third connecting rod 5 close to the first support 8 is rotatably connected to the first support 8, the end of the second connecting rod 4 away from the first connecting rod 3 is rotatably provided with a fourth connecting rod connecting the second connecting rod 4 and the third connecting rod 5, the rotation of the second connecting rod 4 can drive the scraper 2 to rotate through the first connecting rod 3, a pull rod 61 is provided on the fourth connecting rod, the end of the pull rod 61 away from the fourth connecting rod is provided with a connecting block 62, a suction cup is provided on the connecting block 62, the rotation of the second connecting rod 4 can drive the pull rod 61 to move through the third connecting rod 5 and the fourth connecting rod, and the connecting block 62 is used to attract the surface of the kitchenware to be printed and drive the kitchenware to be printed to move.

[0028] Furthermore, the kitchenware has a certain gravity, and the connecting block 62 alone can only drive the kitchenware to move in the horizontal direction. The deviation of the kitchenware will cause the printed pattern to shift. Based on this, a lifting platform 7 slidably connected to the bracket 12 is provided at the bottom of the bracket 12. The lifting platform 7 drives the kitchenware to be printed to move in the vertical direction. The rising speed of the lifting platform 7 is consistent with the component speed of the connecting block 62 in the vertical direction. A guide groove 71 is provided on the lifting platform 7. The connecting block 62 drives the kitchenware to move in the horizontal direction. A positioning line 72 is provided in the guide groove 71. The positioning line 72 is used to assist in limiting the placement position of the kitchenware to be printed. The lifting platform 7 is a prior art and can drive the kitchenware to move in the vertical direction. The specific structure is not drawn in the figure.

[0029] Furthermore, the cross-section of the arc-shaped printing plate 1 is fan-shaped, and a positioning hole 11 is provided on the side wall of the arc-shaped printing plate 1. A second support 10 is provided on the bracket 12 on both sides of the fixed seat 13. An adjusting rod 9 rotatably connected to the second support 10 is provided on the second support 10. A limiting rod 91 is provided at one end of the adjusting rod 9 close to the positioning hole 11, and a rotating motor 92 is provided at the other end away from the positioning hole 11. The limiting rod 91 cooperates with the positioning hole 11 to fix the initial position of the arc-shaped printing plate 1, so that the inner arc surface contacts the printing surface of the arc-shaped printing plate 1 when the kitchenware is loaded. The friction coefficient of the non-stick coating is small. The arc-shaped printing plate 1 is driven to rotate only by the contact between the non-stick coating of the kitchenware and the printing surface of the arc-shaped printing plate 1, which shows insufficient power. Based on this, a rotating motor 92 is added to assist the rotation of the arc-shaped printing plate 1, which helps to print the material completely and continuously. The motor 92 is rotated, and the limit rod 91 and the positioning hole cooperate to change the initial position of the arc-shaped printing plate 1. When the cross-sectional midline of the arc-shaped printing plate 1 has a certain inclination angle with the horizontal plane but is not perpendicular to the horizontal plane, it is suitable for painting the inner curved surface of kitchenware. When the cross-sectional midline of the arc-shaped printing plate 1 is perpendicular to the horizontal plane, such as Figure 7 , suitable for flat pattern printing of kitchenware.

[0030] Furthermore, the cross-section of the scraper 2 is L-shaped, and slide grooves 22 are provided on both sides of the scraper 2 along the length direction of the scraper 2. A light rod 23 is provided at the end of the scraper 21 away from the curved printing plate 1. The scraper 21 is slidably connected to the scraper 2 through the slide groove 22 and the light rod 23. A spring 24 is sleeved on the light rod 23. The addition of the spring 24 makes the scraper 21 contact the screen of the curved printing plate 1 more closely, and at the same time, it can also reduce the damage to the screen caused by the unevenness of the printing surface.

[0031] Furthermore, the end surface of the scraper 21 close to the curved printing plate 1 is a curved surface, and the curved scraper 21 helps to fit the inner curved surface of the kitchenware to be printed.

[0032] Furthermore, the radius of the curved printing plate 1 is smaller than the radius of the kitchenware to be printed, the contact surface between the scraper 2 and the curved printing plate 1 is a curved surface, and the curved surface of the scraper 2 is smaller than or equal to the radius of the inner curved surface of the kitchenware to be printed.

[0033] Furthermore, the pull rod 61 includes a connecting section 1 611 and a connecting section 2 612, the connecting section 2 612 is perpendicular to the fourth connecting rod, and the end of the connecting section 2 612 away from the fourth connecting rod is sleeved on the connecting section 1 611, and the end of the connecting section 1 611 away from the connecting section 2 612 is provided with a connecting block 62, and a plurality of through holes are evenly arranged on the connecting section 2 612, and fixing bolts can be arranged in the through holes to fix the connecting section 2 612 and the connecting section 1 611 so that they do not slide relative to each other. The connecting section 2 612 is sleeved on the connecting section 1 611, and the length of the pull rod 61 can be adjusted to be suitable for kitchen utensils of different sizes.

[0034] When in use, the pigment is added to the polytetrafluoroethylene slurry, mixed evenly, and a colored slurry is obtained. The colored slurry is placed in an arc-shaped printing plate 1 with an arc-shaped cross section, and the kitchenware to be printed is placed on the lifting platform 7. The bottom of the kitchenware coincides with or is concentric with the positioning line 72, that is, at this time, the center line of the kitchenware coincides with the center line of the length direction of the arc-shaped printing plate 1, and the inner arc surface of the kitchenware with a non-stick coating contacts one end of the printing surface of the arc-shaped printing plate 1. The suction cup on the connecting block 62 is attracted to the outer surface of the kitchenware to be printed, and the driving motor is energized. The driving motor drives the second connecting rod 4 to rotate, and the second connecting rod 4 drives the kitchenware to move through the fourth connecting rod and the third connecting rod 5 and the connecting block 62. At the same time, the second connecting rod 4 drives the scraper 2 to rotate through the first connecting rod 3, and the rotation of the scraper 2 drives the scraper 21 to slide along the surface of the arc-shaped printing plate 1, so that the pattern or trademark is printed on the non-stick coating inside the kitchenware. After printing, the kitchenware is removed and placed in a heating device for drying and curing for 10 minutes. 30min, curing temperature is 280℃-430℃.

[0035] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for painting a colored polytetrafluoroethylene pattern, characterized in that: The following steps are involved: S1. Preparation of colored slurry: adding pigment to polytetrafluoroethylene slurry and mixing evenly to obtain colored slurry; S2. Applying colored slurry on the non-stick coating: placing the colored slurry in a curved printing plate with an arc-shaped cross section, the inner curved surface of the kitchenware with the non-stick coating is in contact with the printing surface of the curved printing plate, the center line of the kitchenware coincides with the center line of the length direction of the curved printing plate, so that when the kitchenware moves, it can contact the printing surface of the curved printing plate and drive the curved printing plate to rotate in the positive direction along the axis of the curved printing plate. The kitchenware moves, and the scraper slides along the curved printing plate in the opposite direction of the rotation direction of the curved printing plate, so as to apply the colored slurry on the non-stick coating of the kitchenware; S3. Colored slurry curing: Place the kitchenware coated with the colored slurry into a heating device for drying and curing for 10-30 minutes at a curing temperature of 280°C-430°C.

2. A method for painting a colored polytetrafluoroethylene pattern as claimed in claim 1, characterized in that: The pigment is edible pigment.

3. A method for painting a colored polytetrafluoroethylene pattern as claimed in claim 1, characterized in that: The polytetrafluoroethylene slurry is commercially available food-grade polytetrafluoroethylene slurry.

4. A method for painting a colored polytetrafluoroethylene pattern as claimed in claim 1, characterized in that: The radius of the arc-shaped printing plate is smaller than the radius of the kitchenware to be printed. A scraper is arranged inside the arc-shaped printing plate. The contact surface between the scraper and the arc-shaped printing plate is an arc-shaped surface. The radius of the arc-shaped surface of the scraper is smaller than or equal to the radius of the inner arc surface of the kitchenware to be printed.

5. A brushing device for color polytetrafluoroethylene patterns, characterized in that: The invention comprises an arc-shaped printing plate (1) and a bracket (12), wherein a fixing seat (13) is provided at the top of the bracket (12), the arc-shaped printing plate (1) is rotatably arranged on the fixing seat (13), a scraper (2) matched with the arc-shaped printing plate (1) is provided inside the arc-shaped printing plate (1), the scraper (2) is rotatably connected to the fixing seat (13), a scraper (21) is provided at one end of the scraper (2) close to the arc-shaped printing plate (1), and a first connecting rod (3) rotatably connected to the scraper (2) is provided at one end away from the arc-shaped printing plate (1), and the first connecting rod (3) is away from the scraper An L-shaped second connecting rod (4) is rotatably provided at one end of the plate (2); a corner portion of the second connecting rod (4) is rotatably connected to the bottom of the bracket (12) via a first support (8); a third connecting rod (5) rotatably connected to the first support (8) is provided on the first support (8); a fourth connecting rod (4) is rotatably provided at one end of the second connecting rod (4) away from the first connecting rod (3) and connecting the second connecting rod (4) and the third connecting rod (5); a pull rod (61) is provided on the fourth connecting rod; and a connecting block (62) is provided at one end of the pull rod (61) away from the fourth connecting rod.

6. A color polytetrafluoroethylene pattern painting device as claimed in claim 5, characterized in that: A lifting platform (7) slidably connected to the bracket (12) is provided at the bottom of the bracket (12); a guide groove (71) is provided on the lifting platform (7); and a positioning line (72) is provided in the guide groove (71).

7. A color polytetrafluoroethylene pattern painting device as claimed in claim 5, characterized in that: The arc-shaped printing plate (1) has a fan-shaped cross section, and a positioning hole (11) is provided on a side wall of the arc-shaped printing plate (1). A second support (10) is provided on the brackets (12) on both sides of the fixing seat (13), and an adjusting rod (9) rotatably connected to the second support (10) is provided on the second support (10). A limiting rod (91) is provided at one end of the adjusting rod (9) close to the positioning hole (11), and a rotating motor (92) is provided at one end away from the positioning hole (11) for driving the adjusting rod (9) to rotate.

8. A colored polytetrafluoroethylene pattern painting device as claimed in claim 5, characterized in that: The scraper (2) has an L-shaped cross section. Slide grooves (22) are provided on both sides of the scraper (2) along the length direction of the scraper (2). A polished rod (23) is provided at one end of the scraper (21) away from the arc-shaped printing plate (1). The scraper (21) is slidably connected to the scraper (2) via the slide groove (22) and the polished rod (23). A spring (24) is sleeved on the polished rod (23).

9. A color polytetrafluoroethylene pattern painting device as claimed in claim 5, characterized in that: The pull rod (61) comprises a connecting section 1 (611) and a connecting section 2 (612), wherein the connecting section 2 (612) is perpendicular to the fourth connecting rod, and an end of the connecting section 2 (612) away from the fourth connecting rod is sleeved on the connecting section 1 (611), and an end of the connecting section 1 (611) away from the connecting section 2 (612) is provided with a connecting block (62), and a plurality of through holes are evenly arranged on the connecting section 2 (612).

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