Matt plastic round tube and preparation method thereof

Abstract

The present invention provides a matte plastic round tube and a preparation method thereof, belonging to the technical field of plastic round tubes. The present invention applies oil to the plastic round tube through a specific oiling system, electrostatically removes dust and flames the plastic round tube through a printing machine in the system, and then transmits it to a small oiling machine to apply matte oil after the treatment. The small oiling machine in the present invention is small in size, and the packaging surface is uniform after coating, and there will be no obvious problems such as oiling off the roller line. The adjustment rod and the adjustment knob in the small oiling machine can be adjusted at will to adapt to related equipment, and when the small oiling machine in the present invention transmits the plastic round tube, the rotating cylinder is controlled to raise the glue roller and make it tangent to the plastic round tube. After the oiling is completed, the glue roller is controlled to fall. The oiling system in the present invention is suitable for all plastic or other material packaging, and is not limited to the changes between materials, and has strong adaptability.

Description

Technical Field

[0001] The invention relates to the technical field of plastic round tubes, and in particular to a matte plastic round tube and a preparation method thereof. Background Art

[0002] Plastic is a type of material that uses synthetic or natural polymer resin as the main material. After adding various additives, it has ductility under certain temperature and pressure, and can fix its shape after cooling. In the field of packaging, plastic packaging accounts for about 25%. In order to meet the use requirements of packaging after injection molding, the outer layer of the plastic packaging is generally oiled after injection molding. For example, patent CN110316421A discloses an oiling packaging device, including a feeding mechanism, an oiling mechanism, a transfer mechanism, a buckle mechanism and a feeding mechanism; the buckle mechanism is arranged on one side of the transfer mechanism, and the transfer mechanism includes a transfer tool for accommodating a material box. The workpiece is transported by the feeding mechanism, oiled by the oiling mechanism, and placed in the material box, and then the material box is pressed by the buckle mechanism to complete the automatic oiling and packaging process of the workpiece, ensuring the consistency of the product appearance quality, which is conducive to reducing labor costs.

[0003] The process of oiling the outside of plastic packaging can improve the appearance of the packaging, increase the glossiness of the packaging surface or present a matte effect. At the same time, the wear resistance, stain resistance and water resistance of the oiled plastic packaging can be improved. According to the appearance of the packaging after oiling, varnish can be divided into glossy oil and matte oil. Among them, glossy oil includes polyurethane, polyester, acrylic resin and other substances, and matte oil includes water-based acrylic resin, styrene-acrylic copolymer emulsion and other substances.

[0004] When applying matte oil to plastic packaging, it is necessary to ensure that the surface of the plastic packaging is non-reflective and shows surface softness. This requires that the plastic packaging be coated evenly during the oiling process without obvious gloss differences. This places higher requirements on the oiling device and requires precise control of parameters such as coating amount, coating speed and coating method during the coating process to ensure the consistency and scratch resistance of the matte effect.

[0005] CN110787978B discloses a super matte matte machine, including a frame, a conveying mechanism, an air curtain spray device, and a heating and pressurizing device. The frame is equipped with an air control device; the conveying mechanism is installed in the frame; a matte light box, the matte light box is fixed on the top of the frame and is located above the conveying mechanism, and a matte lamp is installed in the matte light box, and the matte lamp is located at the bottom of the matte light box; the air curtain spray device is installed in the matte light box and is located at the bottom of the matte light box; the heating and pressurizing device is installed outside the frame, and the outlet of the heating and pressurizing device is connected to the air curtain spray device. The heating and pressurizing device is controlled by the air control device, and the plate is transported to the bottom of the matte light box through the conveying mechanism, and the nitrogen is heated and pressurized by the heating and pressurizing device, and the nitrogen is passed into the bottom of the matte light box through the air curtain spray device to isolate oxygen, and then the matte lamp is used to break the surface gloss of the UV paint to form an extreme matte effect of losing light. The oiling device in this technical solution is large in size, complex in process, and difficult to repair during the oiling process.

[0006] In summary, the process of coating matte oil on plastic packaging requires complicated technology, the oil coating device is large in size, difficult to store and maintain, which limits the use of the oil coating device. At the same time, the coating uniformity of the matte oil coating device, the obvious roller-off line after coating, the obvious matte oil mark on the outer layer of the packaging, the glossiness of the plastic packaging after coating does not meet the standard, and the firmness is poor, etc., are still problems that need to be solved urgently. Summary of the invention

[0007] In view of the above problems, the present invention provides a matte plastic round tube and a preparation method thereof. The matte plastic round tube prepared by the oil coating system has good firmness and high softness, reduces the reflectivity of the matte plastic round tube, and reduces the generation of off-roller lines according to a small oil coating machine.

[0008] The present invention provides a matte plastic round tube, which is made of a plastic round tube through an oiling system; the matte plastic round tube has no obvious color change after being irradiated by a 300W bulb and a 20W ultraviolet ray for 168 hours respectively; the sliding angle of the matte plastic round tube in a smoothness test is 50-60°; after an adhesion test, the matte plastic round tube has no falling-off phenomenon on the surface; and no roller separation line is generated on the surface of the matte plastic round tube;

[0009] According to the transport direction of the plastic round tube, the oiling system includes a printing machine and a UV curing machine in sequence;

[0010] The printing press includes an electrostatic dust removal device, a flame treatment device and a small oiling machine;

[0011] The small oiling machine is 280 mm long, 240 mm wide and 200-260 mm high;

[0012] The small oil coating machine comprises, from bottom to top, a base, a slide rail, a fixed seat, a support frame, a rounded oil tank, a stepped movable fixed plate, a square movable fixed plate, a rotary cylinder, a motor and an oil coating roller;

[0013] The slide rail is located above the base, a ball screw is installed in the middle of the slide rail, and knobs are installed at the left and right ends of the ball screw for adjusting the slide rail to move forward and backward on the base;

[0014] The support frame is fixed on the slide rail through the fixing seat, the fixing seat and the slide rail are fixed by bolts, and a fixing shaft is passed through the connection between the fixing seat and the support frame;

[0015] The slide rail is a cross rail;

[0016] The rotating cylinder is located in the lower front of the support frame, an eccentric wheel is installed between the rotating cylinder and the support frame, and the rotating cylinder is fixed to the slide rail by bolts. The rotating cylinder makes the support frame move up and down with the fixed axis on the fixed seat as the center by doing work; the rotating cylinder controls the support frame to move up and down within a distance range of 60mm;

[0017] The support frame is connected to the fixing seat via a ball bearing, with the fixing shaft of the fixing seat as a fulcrum;

[0018] The oiling roller includes a coating roller, a glue transfer roller, and a glue leveling roller from front to back. The horizontal height of the center of the glue leveling roller is higher than the horizontal height of the center of the glue transfer roller, and the horizontal height of the center of the coating roller is higher than the horizontal height of the center of the glue leveling roller.

[0019] Furthermore, when the rotary cylinder controls the lower limit of the up and down movement of the support frame, the height of the small oiler is 200 mm, and when the rotary cylinder controls the upper limit of the up and down movement of the support frame, the height of the small oiler is 260 mm.

[0020] Furthermore, the horizontal height of the center of the glue transfer roller is 15-19 mm away from the horizontal height of the center of the glue leveling roller, and the horizontal height of the center of the glue transfer roller is 40-44 mm away from the horizontal height of the center of the glue coating roller.

[0021] Furthermore, the distance between the vertical line of the center of the glue transfer roller and the vertical line of the center of the glue leveling roller is 45-49 mm, and the distance between the vertical line of the center of the glue transfer roller and the vertical line of the center of the glue coating roller is 40-44 mm.

[0022] Furthermore, the diameter of the glue coating roller is 60 mm, the diameter of the glue transfer roller is 60 mm, and the diameter of the glue leveling roller is 40 mm.

[0023] Furthermore, a stepped movable fixed plate is embedded in both the left and right sides of the support frame, a square movable fixed plate is embedded in the high step of the stepped movable fixed plate, two ends of the glue transfer roller are fixed at the low step of the stepped movable fixed plate, two ends of the glue leveling roller are fixed on the square movable fixed plate, and the moving directions of the stepped movable fixed plate and the square movable fixed plate are parallel to the support frame.

[0024] Furthermore, the stepped movable fixed plate is equipped with four knobs parallel to the stepped movable fixed plate and protruding from the support frame, which control the movement of the stepped movable fixed plate and adjust the distance between the glue coating roller and the glue transfer roller; the square movable fixed plate is equipped with two knobs parallel to the square movable fixed plate and protruding from the support frame, which control the movement of the square movable fixed plate and adjust the distance between the glue coating roller and the glue transfer roller.

[0025] Furthermore, the rounded oil groove is located below the rubber transfer roller, the rounded oil groove is "V"-shaped, the "V"-shaped angle of the rounded oil groove is a rounded structure, the angle at the extension line of the rounded structure of the "V"-shaped angle of the rounded oil groove is an obtuse angle, and the angle of the obtuse angle is 125°.

[0026] Furthermore, protrusions adapted to the rounded oil groove are provided on the left and right inner walls of the support frame, and the rounded oil groove is supported on the protrusions on the left and right inner walls of the support frame, the front end of the rounded oil groove protrudes from the front end of the support frame, and the rear end of the rounded oil groove stops at the tail end of the rear wall of the support frame.

[0027] Furthermore, the motor is arranged at the front end of the support frame, and tension wheels are respectively arranged above the glue spreading roller and between the glue coating roller and the motor, and between the glue spreading roller and the motor. The motor and the glue coating roller, the glue transfer roller and the glue spreading roller, and the tension wheel are connected through gears and tracks.

[0028] Furthermore, the printing machine and the ultraviolet curing machine are connected via a transmission device.

[0029] Furthermore, the glue coating roller is made of polyurethane material, the glue transfer roller is made of stainless steel material, and the glue leveling roller is made of polyurethane material.

[0030] Furthermore, the plastic round tube is one or more of a polyvinyl chloride round tube, a polyethylene terephthalate round tube or a polyethylene round tube.

[0031] Furthermore, the matte oil is water-based acrylic resin.

[0032] Furthermore, the thickness of the matte oil is 0.02-0.03 mm.

[0033] The present invention also provides a method for preparing a matte plastic round tube, comprising the following steps:

[0034] Step 1, conveying the plastic round tube to the above-mentioned printing machine, and first passing through an electrostatic dust removal device and a flame treatment device for dust removal and flame treatment;

[0035] Step 2, add the matte oil into the rounded oil tank through the front end of the rounded oil tank of the above-mentioned small oil coating machine, and adjust the thickness of the matte oil by adjusting the knobs connected to the stepped movable fixed plate and the square movable fixed plate, turn on the motor to control the rotation speed of the glue coating roller, the glue transfer roller and the glue leveling roller, and transfer the plastic round tube after dust removal and flame treatment in step 1 to the top of the small oil coating machine parallel to the glue coating roller, adjust the rotating cylinder to raise the support frame, make the glue coating roller tangent to the plastic round tube, and the plastic round tube and the glue coating roller rotate in opposite directions to apply oil to obtain an oiled round tube;

[0036] Step 3: convey the oil-coated round tube to the above-mentioned ultraviolet curing machine for curing to obtain the matte plastic round tube.

[0037] Furthermore, the plastic round tube in step 1 is one or more of a polyvinyl chloride round tube, a polyethylene terephthalate round tube or a polyethylene round tube.

[0038] Furthermore, the matte oil in step 2 is water-based acrylic resin.

[0039] ‌‌Furthermore, the thickness of the matte oil in step 2 is 0.02-0.03 mm.

[0040] Furthermore, in step 2, the rotation speed of the glue coating roller, the glue transfer roller and the glue leveling roller is 360 r / min.

[0041] Furthermore, in step 2, the rubber coating roller and the plastic round tube rotate at the same linear speed.

[0042] Furthermore, in step 2, the plastic tube rotates 2 and a half times.

[0043] Furthermore, in step 2, when a plastic round tube is oiled, the rotating cylinder controls the glue coating roller to leave the plastic round tube, and when the next plastic round tube is transferred to the glue coating roller, the rotating cylinder controls the glue coating roller to be parallel and tangent to the next plastic round tube.

[0044] Furthermore, the wavelength of the ultraviolet curing machine in step 3 is 365nm, and the irradiation time is 0.5-1s / piece.

[0045] Beneficial effects of the present invention:

[0046] 1. The present invention applies oil to the plastic round tube through a specific oiling system. Conventional oiling devices are mostly devices for applying bright oil to the surface of the plastic round tube. The coating process is smooth, and the coating equipment is large in size. When used together with other equipment, a large production site is required. At the same time, due to the large size of the equipment, the operation and maintenance of the equipment are difficult. Also, because most of the oiling equipment is for applying bright oil, it is not suitable for applying matte oil, the coating is uneven, the thickness is uneven, and there are other problems such as obvious roller separation lines after coating. The small oiling machine in the present invention is small in size, and the plastic round tube after coating is smooth. The outer surface is uniform, and there will be no obvious problems such as oiling off the roller line. At the same time, because the small and medium-sized oiling machine of the present invention is small in size, the speed of the adjusting device and the thickness of the oil film and subsequent maintenance are convenient and easy, and the special structure of the small oiling machine of the present invention also makes it easy to adjust the thickness of the oil film and the speed of the oiling roller. The position and height of the small oiling machine can be adjusted at will to adapt to the coating requirements. When the plastic round tube is transmitted over, the small oiling machine of the present invention controls the rotating cylinder to lift the rubber coating roller and make it tangent to the plastic round tube. After the oiling is completed, the rubber coating roller is controlled to fall, and this is repeated, and no waste is generated;

[0047] 2. The coating roller and the glue-distributing roller of the small oiling machine of the present invention are made of polyurethane, while the transfer roller is made of stainless steel. The combination of plastic and metal materials allows the varnish to be evenly and smoothly transferred between the rollers, and does not cause friction due to the all-metal rollers, which accelerates the damage between the rollers, and also avoids the risk of metal particles falling due to wear between the rollers, thereby causing impurities in the varnish.

[0048] 3. The rounded oil tank of the small oil coating machine in the present invention is adapted to the setting of the oil coating roller, and the front and rear ends of the rounded oil tank cover the oil coating roller, so that the oil coating roller will not splash the varnish due to excessive rotation speed during rotation. When adding matte oil, it is only necessary to add it along the protruding front end of the rounded oil tank, which is convenient and easy. At the same time, due to the particularity of the device, there will be no problems such as blockage during the oiling process. Matt oil is filled in the oil tank. The plastic round tube after being oiled with the matte oil in the present invention has low reflectivity and improved wear resistance. It also has aging resistance and corrosion resistance. The oil coating system in the present invention is suitable for all plastics or other material packaging, is not limited to changes between materials, and has strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a process flow chart of the oil coating system described in the present invention;

[0050] Figure 2Schematic diagram of the oiling process of the rubber coating roller in the present invention

[0051] Figure 3 It is a left side view of the small oil coating machine described in the present invention;

[0052] Figure 4 It is a right side view of the small oil coating machine described in the present invention;

[0053] Figure 5 This is a diagram showing the gear connection state in the right view of the small oil coating machine described in the present invention;

[0054] Figure 6 A top view of the small oiling machine described in the present invention;

[0055] The names of the numbers in the figure are: 1. printing machine; 2. ultraviolet curing machine; 3. small oiling machine; 31. base; 32. slide rail; 33. fixed seat; 34. support frame; 35. rounded oil tank; 36. stepped movable fixed plate; 37. square movable fixed plate; 38. rotating cylinder; 39. motor; 301. glue coating roller; 302. glue transfer roller; 303. glue leveling roller. DETAILED DESCRIPTION

[0056] The invention is described in detail below with reference to the embodiments:

[0057] The present invention provides a matte plastic round tube and a preparation method thereof. The plastic round tube with a matte effect is prepared by the oil coating system and method of the present invention, which greatly reduces its reflectivity and improves the adhesion of the matte oil.

[0058] Example 1

[0059] The present embodiment provides a matte plastic round tube, which is made of a plastic round tube through an oiling system; the matte plastic round tube has no obvious discoloration after being irradiated by a 300W bulb and a 20W ultraviolet ray for 168 hours respectively; the sliding angle of the matte plastic round tube in the smoothness test is 50°; after the matte plastic round tube is subjected to an adhesion test, there is no falling off phenomenon on the surface; and there is no roller separation line on the surface of the matte plastic round tube;

[0060] According to the transport direction of the plastic round tube, the oiling system includes a printing machine 1 and an ultraviolet curing machine 2 in sequence;

[0061] The printing machine 1 includes an electrostatic dust removal device, a flame treatment device and a small oiling machine 3;

[0062] The small oiling machine 3 is 280 mm long, 240 mm wide and 200-260 mm high;

[0063] The small oil coating machine 3 includes, from bottom to top, a base 31, a slide rail 32, a fixed seat 33, a support frame 34, a rounded oil tank 35, a stepped movable fixed plate 36, a square movable fixed plate 37, a rotary cylinder 38, a motor 39 and an oil coating roller;

[0064] The slide rail 32 is located above the base 31, a ball screw is installed in the middle of the slide rail 32, and knobs are installed at the left and right ends of the ball screw for adjusting the slide rail 32 to move forward and backward on the base 31;

[0065] The support frame 34 is fixed to the slide rail 32 through the fixing seat 33. The fixing seat 33 and the slide rail 32 are fixed by bolts. A fixing shaft is passed through the connection between the fixing seat 33 and the support frame 34.

[0066] The slide rail 32 is a cross rail;

[0067] The rotating cylinder 38 is located in the lower front of the support frame 34. An eccentric wheel is installed between the rotating cylinder 38 and the support frame 34. The rotating cylinder 38 is fixed to the slide rail 32 by bolts. The rotating cylinder 38 makes the support frame 34 move up and down with the fixed axis on the fixed seat 33 as the center by doing work. The rotating cylinder 38 controls the support frame 34 to move up and down within a range of 60 mm.

[0068] The support frame 34 is connected to the fixing seat 33 via a ball bearing, with the fixing axis of the fixing seat 33 as a fulcrum;

[0069] The oiling rollers include a coating roller 301, a glue transfer roller 302, and a glue leveling roller 303 from front to back. The horizontal height of the center of the glue leveling roller 303 is higher than the horizontal height of the center of the glue transfer roller 302. The horizontal height of the center of the coating roller 301 is higher than the horizontal height of the center of the glue leveling roller 303.

[0070] In this embodiment, when the rotary cylinder 38 controls the lower limit of the vertical movement of the support frame 34, the height of the small oiling machine 3 is 200 mm, and when the rotary cylinder 38 controls the upper limit of the vertical movement of the support frame 34, the height of the small oiling machine 3 is 260 mm.

[0071] The horizontal height of the center of the glue transfer roller 302 is 17 mm from the horizontal height of the center of the glue leveling roller 303, and the horizontal height of the center of the glue transfer roller 302 is 42 mm from the horizontal height of the center of the glue coating roller 301;

[0072] The distance between the center vertical line of the glue transfer roller 302 and the center vertical line of the glue leveling roller 303 is 47 mm, and the distance between the center vertical line of the glue transfer roller 302 and the center vertical line of the glue coating roller 301 is 42 mm;

[0073] The diameter of the glue coating roller 301 is 60 mm, the diameter of the glue transfer roller 302 is 60 mm, and the diameter of the glue leveling roller 303 is 40 mm;

[0074] The left and right sides of the support frame 34 are both embedded with a stepped movable fixing plate 36, and the high step of the stepped movable fixing plate 36 is embedded with a square movable fixing plate 37. The two ends of the glue transfer roller 302 are fixed at the low step of the stepped movable fixing plate 36, and the two ends of the glue leveling roller 303 are fixed on the square movable fixing plate 37. The moving directions of the stepped movable fixing plate 36 and the square movable fixing plate 37 are parallel to the support frame 34.

[0075] The stepped movable fixing plate 36 is provided with four knobs which are parallel to the stepped movable fixing plate 36 and protrude from the support frame 34, and are used to control the movement of the stepped movable fixing plate 36 and adjust the distance between the glue coating roller 301 and the glue transfer roller 302; the square movable fixing plate 37 is provided with two knobs which are parallel to the square movable fixing plate 37 and protrude from the support frame 34, and are used to control the movement of the square movable fixing plate 37 and adjust the distance between the glue spreading roller 303 and the glue transfer roller 302;

[0076] The rounded oil groove 35 is located below the rubber transfer roller 302. The rounded oil groove 35 is V-shaped. The V-shaped angle of the rounded oil groove 35 is a rounded structure. The angle of the extended line of the rounded structure of the V-shaped angle of the rounded oil groove 35 is an obtuse angle, and the angle of the obtuse angle is 125°.

[0077] The inner walls on the left and right sides of the support frame 34 are provided with protrusions adapted to the rounded oil groove 35. The rounded oil groove 35 is supported on the protrusions on the inner walls on the left and right sides of the support frame 34. The front end of the rounded oil groove 35 protrudes from the front end of the support frame 34, and the rear end of the rounded oil groove 35 stops at the rear end of the rear wall of the support frame 34.

[0078] The motor 39 is arranged at the front end of the support frame 34, and tension wheels are arranged above the glue spreading roller 303 and between the glue coating roller 301 and the motor 39 and between the glue spreading roller 303 and the motor 39. The motor 39 and the glue coating roller 301, the glue transfer roller 302 and the glue spreading roller 303, and the tension wheels are connected through gears and tracks;

[0079] The printing machine 1 and the ultraviolet curing machine 2 are connected via a transmission device;

[0080] The glue coating roller 301 is made of polyurethane material, the glue transfer roller 302 is made of stainless steel material, and the glue leveling roller 303 is made of polyurethane material;

[0081] The plastic round tube is a polyvinyl chloride round tube, the matte oil is a water-based acrylic resin, and the thickness of the matte oil is 0.02 mm.

[0082] This embodiment also provides a method for preparing the matte plastic round tube, comprising the following steps:

[0083] Step 1: convey the plastic round tube to the above-mentioned printing machine 1 and first pass through the electrostatic dust removal device and the flame treatment device for dust removal and flame treatment;

[0084] Step 2, add water-based acrylic resin into the rounded oil tank 35 through the front end of the rounded oil tank 35 of the above-mentioned small oil coating machine 3, and adjust the knobs connected to the stepped movable fixed plate 36 and the square movable fixed plate 37 to adjust the thickness of the matte oil to 0.02mm, turn on the motor 39 to control the rotation speed of the glue coating roller 301, the glue transfer roller 302 and the glue leveling roller 303 to 360r / min, and transfer the plastic round tube after dust removal and flame treatment in step 1 to the top of the small oil coating machine 3 and parallel to the glue coating roller 301, adjust the rotating cylinder 38 to raise the support frame 34, so that the glue coating roller 301 is tangent to the plastic round tube, and the plastic round tube and the glue coating roller 301 rotate in opposite directions for 2 and a half turns to apply oil, and obtain an oiled round tube;

[0085] Step 3: convey the oil-coated round tube to the above-mentioned ultraviolet curing machine 2 for curing, the wavelength of the ultraviolet curing machine 2 is 365nm, and the irradiation time is 0.5s / piece, to obtain the matte plastic round tube.

[0086] Example 2

[0087] The present embodiment provides a matte plastic round tube, which is made of a plastic round tube through an oiling system; the matte plastic round tube has no obvious discoloration after being irradiated by a 300W bulb and a 20W ultraviolet ray for 168 hours respectively; the sliding angle of the matte plastic round tube in the smoothness test is 53°; after the matte plastic round tube is subjected to an adhesion test, there is no falling off phenomenon on the surface; and there is no roller separation line on the surface of the matte plastic round tube;

[0088] According to the transport direction of the plastic round tube, the oiling system includes a printing machine 1 and an ultraviolet curing machine 2 in sequence;

[0089] The printing machine 1 includes an electrostatic dust removal device, a flame treatment device and a small oiling machine 3;

[0090] The small oiling machine 3 is 280 mm long, 240 mm wide and 200-260 mm high;

[0091] The small oil coating machine 3 includes, from bottom to top, a base 31, a slide rail 32, a fixed seat 33, a support frame 34, a rounded oil tank 35, a stepped movable fixed plate 36, a square movable fixed plate 37, a rotary cylinder 38, a motor 39 and an oil coating roller;

[0092] The slide rail 32 is located above the base 31, a ball screw is installed in the middle of the slide rail 32, and knobs are installed at the left and right ends of the ball screw for adjusting the slide rail 32 to move forward and backward on the base 31;

[0093] The support frame 34 is fixed to the slide rail 32 through the fixing seat 33. The fixing seat 33 and the slide rail 32 are fixed by bolts. A fixing shaft is passed through the connection between the fixing seat 33 and the support frame 34.

[0094] The slide rail 32 is a cross rail;

[0095] The rotating cylinder 38 is located in the lower front of the support frame 34. An eccentric wheel is installed between the rotating cylinder 38 and the support frame 34. The rotating cylinder 38 is fixed to the slide rail 32 by bolts. The rotating cylinder 38 makes the support frame 34 move up and down with the fixed axis on the fixed seat 33 as the center by doing work. The rotating cylinder 38 controls the support frame 34 to move up and down within a range of 60 mm.

[0096] The support frame 34 is connected to the fixing seat 33 via a ball bearing, with the fixing axis of the fixing seat 33 as a fulcrum;

[0097] The oiling rollers include a coating roller 301, a glue transfer roller 302, and a glue leveling roller 303 from front to back. The horizontal height of the center of the glue leveling roller 303 is higher than the horizontal height of the center of the glue transfer roller 302. The horizontal height of the center of the coating roller 301 is higher than the horizontal height of the center of the glue leveling roller 303.

[0098] In this embodiment, when the rotary cylinder 38 controls the lower limit of the vertical movement of the support frame 34, the height of the small oiling machine 3 is 200 mm, and when the rotary cylinder 38 controls the upper limit of the vertical movement of the support frame 34, the height of the small oiling machine 3 is 260 mm.

[0099] The horizontal height of the center of the glue transfer roller 302 is 15 mm from the horizontal height of the center of the glue leveling roller 303, and the horizontal height of the center of the glue transfer roller 302 is 40 mm from the horizontal height of the center of the glue coating roller 301;

[0100] The distance between the vertical line of the center of the glue transfer roller 302 and the vertical line of the center of the glue leveling roller 303 is 45 mm, and the distance between the vertical line of the center of the glue transfer roller 302 and the vertical line of the center of the glue coating roller 301 is 40 mm;

[0101] The diameter of the glue coating roller 301 is 60 mm, the diameter of the glue transfer roller 302 is 60 mm, and the diameter of the glue leveling roller 303 is 40 mm;

[0102] The left and right sides of the support frame 34 are both embedded with a stepped movable fixing plate 36, and the high step of the stepped movable fixing plate 36 is embedded with a square movable fixing plate 37. The two ends of the glue transfer roller 302 are fixed at the low step of the stepped movable fixing plate 36, and the two ends of the glue leveling roller 303 are fixed on the square movable fixing plate 37. The moving directions of the stepped movable fixing plate 36 and the square movable fixing plate 37 are parallel to the support frame 34.

[0103] The stepped movable fixing plate 36 is provided with four knobs which are parallel to the stepped movable fixing plate 36 and protrude from the support frame 34, and are used to control the movement of the stepped movable fixing plate 36 and adjust the distance between the glue coating roller 301 and the glue transfer roller 302; the square movable fixing plate 37 is provided with two knobs which are parallel to the square movable fixing plate 37 and protrude from the support frame 34, and are used to control the movement of the square movable fixing plate 37 and adjust the distance between the glue spreading roller 303 and the glue transfer roller 302;

[0104] The rounded oil groove 35 is located below the rubber transfer roller 302. The rounded oil groove 35 is V-shaped. The V-shaped angle of the rounded oil groove 35 is a rounded structure. The angle of the extended line of the rounded structure of the V-shaped angle of the rounded oil groove 35 is an obtuse angle, and the angle of the obtuse angle is 125°.

[0105] The inner walls on the left and right sides of the support frame 34 are provided with protrusions adapted to the rounded oil groove 35. The rounded oil groove 35 is supported on the protrusions on the inner walls on the left and right sides of the support frame 34. The front end of the rounded oil groove 35 protrudes from the front end of the support frame 34, and the rear end of the rounded oil groove 35 stops at the rear end of the rear wall of the support frame 34.

[0106] The motor 39 is arranged at the front end of the support frame 34, and tension wheels are arranged above the glue spreading roller 303 and between the glue coating roller 301 and the motor 39 and between the glue spreading roller 303 and the motor 39. The motor 39 and the glue coating roller 301, the glue transfer roller 302 and the glue spreading roller 303, and the tension wheels are connected through gears and tracks;

[0107] The printing machine 1 and the ultraviolet curing machine 2 are connected via a transmission device;

[0108] The glue coating roller 301 is made of polyurethane material, the glue transfer roller 302 is made of stainless steel material, and the glue leveling roller 303 is made of polyurethane material;

[0109] The plastic round tube is a polyethylene terephthalate round tube, the matte oil is a water-based acrylic resin, and the thickness of the matte oil is 0.02 mm.

[0110] This embodiment also provides a method for preparing the matte plastic round tube, comprising the following steps:

[0111] Step 1: convey the plastic round tube to the above-mentioned printing machine 1 and first pass through the electrostatic dust removal device and the flame treatment device for dust removal and flame treatment;

[0112] Step 2, add water-based acrylic resin into the rounded oil tank 35 through the front end of the rounded oil tank 35 of the above-mentioned small oil coating machine 3, and adjust the knobs connected to the stepped movable fixed plate 36 and the square movable fixed plate 37 to adjust the thickness of the matte oil to 0.02mm, turn on the motor 39 to control the rotation speed of the glue coating roller 301, the glue transfer roller 302 and the glue leveling roller 303 to 360r / min, and transfer the plastic round tube after dust removal and flame treatment in step 1 to the top of the small oil coating machine 3 and parallel to the glue coating roller 301, adjust the rotating cylinder 38 to raise the support frame 34, so that the glue coating roller 301 is tangent to the plastic round tube, and the plastic round tube and the glue coating roller 301 rotate in opposite directions for 2 and a half turns to apply oil, and obtain an oiled round tube;

[0113] Step 3: convey the oil-coated round tube to the above-mentioned ultraviolet curing machine 2 for curing, the wavelength of the ultraviolet curing machine 2 is 365nm, and the irradiation time is 1s / piece, to obtain the matte plastic round tube.

[0114] Example 3

[0115] The present embodiment provides a matte plastic round tube, which is made of a plastic round tube through an oiling system; the matte plastic round tube has no obvious color change after being irradiated by a 300W bulb and a 20W ultraviolet ray for 168 hours respectively; the sliding angle of the matte plastic round tube in the smoothness test is 60°; after the matte plastic round tube is subjected to an adhesion test, there is no falling off phenomenon on the surface; and there is no roller separation line on the surface of the matte plastic round tube;

[0116] According to the transport direction of the plastic round tube, the oiling system includes a printing machine 1 and an ultraviolet curing machine 2 in sequence;

[0117] The printing machine 1 includes an electrostatic dust removal device, a flame treatment device and a small oiling machine 3;

[0118] The small oiling machine 3 is 280 mm long, 240 mm wide and 200-260 mm high;

[0119] The small oil coating machine 3 includes, from bottom to top, a base 31, a slide rail 32, a fixed seat 33, a support frame 34, a rounded oil tank 35, a stepped movable fixed plate 36, a square movable fixed plate 37, a rotary cylinder 38, a motor 39 and an oil coating roller;

[0120] The slide rail 32 is located above the base 31, a ball screw is installed in the middle of the slide rail 32, and knobs are installed at the left and right ends of the ball screw for adjusting the slide rail 32 to move forward and backward on the base 31;

[0121] The support frame 34 is fixed to the slide rail 32 through the fixing seat 33. The fixing seat 33 and the slide rail 32 are fixed by bolts. A fixing shaft is passed through the connection between the fixing seat 33 and the support frame 34.

[0122] The slide rail 32 is a cross rail;

[0123] The rotating cylinder 38 is located in the lower front of the support frame 34. An eccentric wheel is installed between the rotating cylinder 38 and the support frame 34. The rotating cylinder 38 is fixed to the slide rail 32 by bolts. The rotating cylinder 38 makes the support frame 34 move up and down with the fixed axis on the fixed seat 33 as the center by doing work. The rotating cylinder 38 controls the support frame 34 to move up and down within a range of 60 mm.

[0124] The support frame 34 is connected to the fixing seat 33 via a ball bearing, with the fixing axis of the fixing seat 33 as a fulcrum;

[0125] The oiling rollers include a coating roller 301, a glue transfer roller 302, and a glue leveling roller 303 from front to back. The horizontal height of the center of the glue leveling roller 303 is higher than the horizontal height of the center of the glue transfer roller 302. The horizontal height of the center of the coating roller 301 is higher than the horizontal height of the center of the glue leveling roller 303.

[0126] In this embodiment, when the rotary cylinder 38 controls the lower limit of the vertical movement of the support frame 34, the height of the small oiling machine 3 is 200 mm, and when the rotary cylinder 38 controls the upper limit of the vertical movement of the support frame 34, the height of the small oiling machine 3 is 260 mm.

[0127] The horizontal height of the center of the glue transfer roller 302 is 17 mm from the horizontal height of the center of the glue leveling roller 303, and the horizontal height of the center of the glue transfer roller 302 is 44 mm from the horizontal height of the center of the glue coating roller 301;

[0128] The distance between the center vertical line of the glue transfer roller 302 and the center vertical line of the glue leveling roller 303 is 49 mm, and the distance between the center vertical line of the glue transfer roller 302 and the center vertical line of the glue coating roller 301 is 44 mm;

[0129] The diameter of the glue coating roller 301 is 60 mm, the diameter of the glue transfer roller 302 is 60 mm, and the diameter of the glue leveling roller 303 is 40 mm;

[0130] The left and right sides of the support frame 34 are both embedded with a stepped movable fixing plate 36, and the high step of the stepped movable fixing plate 36 is embedded with a square movable fixing plate 37. The two ends of the glue transfer roller 302 are fixed at the low step of the stepped movable fixing plate 36, and the two ends of the glue leveling roller 303 are fixed on the square movable fixing plate 37. The moving directions of the stepped movable fixing plate 36 and the square movable fixing plate 37 are parallel to the support frame 34.

[0131] The stepped movable fixing plate 36 is provided with four knobs which are parallel to the stepped movable fixing plate 36 and protrude from the support frame 34, and are used to control the movement of the stepped movable fixing plate 36 and adjust the distance between the glue coating roller 301 and the glue transfer roller 302; the square movable fixing plate 37 is provided with two knobs which are parallel to the square movable fixing plate 37 and protrude from the support frame 34, and are used to control the movement of the square movable fixing plate 37 and adjust the distance between the glue spreading roller 303 and the glue transfer roller 302;

[0132] The rounded oil groove 35 is located below the rubber transfer roller 302. The rounded oil groove 35 is V-shaped. The V-shaped angle of the rounded oil groove 35 is a rounded structure. The angle of the extended line of the rounded structure of the V-shaped angle of the rounded oil groove 35 is an obtuse angle, and the angle of the obtuse angle is 125°.

[0133] The inner walls on the left and right sides of the support frame 34 are provided with protrusions adapted to the rounded oil groove 35. The rounded oil groove 35 is supported on the protrusions on the inner walls on the left and right sides of the support frame 34. The front end of the rounded oil groove 35 protrudes from the front end of the support frame 34, and the rear end of the rounded oil groove 35 stops at the rear end of the rear wall of the support frame 34.

[0134] The motor 39 is arranged at the front end of the support frame 34, and tension wheels are arranged above the glue spreading roller 303 and between the glue coating roller 301 and the motor 39 and between the glue spreading roller 303 and the motor 39. The motor 39 and the glue coating roller 301, the glue transfer roller 302 and the glue spreading roller 303, and the tension wheels are connected through gears and tracks;

[0135] The printing machine 1 and the ultraviolet curing machine 2 are connected via a transmission device;

[0136] The glue coating roller 301 is made of polyurethane material, the glue transfer roller 302 is made of stainless steel material, and the glue leveling roller 303 is made of polyurethane material;

[0137] The plastic round tube is a polyethylene round tube, the matte oil is a water-based acrylic resin, and the thickness of the matte oil is 0.03 mm.

[0138] This embodiment also provides a method for preparing the matte plastic round tube, comprising the following steps:

[0139] Step 1: convey the plastic round tube to the above-mentioned printing machine 1 and first pass through the electrostatic dust removal device and the flame treatment device for dust removal and flame treatment;

[0140] Step 2, add water-based acrylic resin into the rounded oil tank 35 through the front end of the rounded oil tank 35 of the above-mentioned small oil coating machine 3, and adjust the knobs connected to the stepped movable fixed plate 36 and the square movable fixed plate 37 to adjust the thickness of the matte oil to 0.03mm, turn on the motor 39 to control the rotation speed of the glue coating roller 301, the glue transfer roller 302 and the glue leveling roller 303 to 360r / min, and transfer the plastic round tube after dust removal and flame treatment in step 1 to the top of the small oil coating machine 3 and parallel to the glue coating roller 301, adjust the rotating cylinder 38 to raise the support frame 34, so that the glue coating roller 301 is tangent to the plastic round tube, and the plastic round tube and the glue coating roller 301 rotate in opposite directions for 2 and a half turns to apply oil, and obtain an oiled round tube;

[0141] Step 3: convey the oil-coated round tube to the above-mentioned ultraviolet curing machine 2 for curing, the wavelength of the ultraviolet curing machine 2 is 365nm, and the irradiation time is 1s / piece, to obtain the matte plastic round tube.

[0142] Comparative Example 1

[0143] The comparative example provides a matte plastic round tube, which is made of a plastic round tube through an oiling system; the matte plastic round tube has no obvious color change after being irradiated by a 300W bulb and a 20W ultraviolet ray for 168 hours respectively; the sliding angle of the matte plastic round tube in the smoothness test is 58°; after the matte plastic round tube is subjected to an adhesion test, there is no falling off phenomenon on the surface, but there is an obvious roller-off line;

[0144] According to the transport direction of the plastic round tube, the oiling system includes a printing machine 1 and an ultraviolet curing machine 2 in sequence;

[0145] The printing machine 1 includes an electrostatic dust removal device, a flame treatment device and an oil coating machine.

[0146] In this comparative example, the printing machine 1 and the ultraviolet curing machine 2 are connected via a transmission device;

[0147] The plastic round tube is a polyethylene round tube, the matte oil is a water-based acrylic resin, and the thickness of the matte oil is 0.03 mm.

[0148] This comparative example also provides a method for preparing the matte plastic round tube, comprising the following steps:

[0149] Step 1: convey the plastic round tube to the above-mentioned printing machine 1 and first pass through the electrostatic dust removal device and the flame treatment device for dust removal and flame treatment;

[0150] Step 2, adding water-based acrylic resin into the above-mentioned oil coating machine, and coating the plastic round tube in step 1 with oil to obtain an oil-coated round tube;

[0151] Step 3: convey the oil-coated round tube to the above-mentioned ultraviolet curing machine 2 for curing, the wavelength of the ultraviolet curing machine 2 is 365nm, and the irradiation time is 1s / piece, to obtain the matte plastic round tube.

[0152] In this comparative example, the oil coating machine is RDA12-80U produced by POLYTYPE.

[0153] Table 1 shows the properties of the matte plastic round tubes in Examples 1-3 and Comparative Example 1

[0154]

[0155] As shown in Table 1, the matte plastic round tube prepared by the special oil coating system in the present invention is resistant to ultraviolet rays and light exposure, has strong adhesion and uniform thickness, while the comparative example 1 using the conventional oil coating device has an obvious roller separation line, which makes the appearance of the material have obvious defects.

[0156] In the present invention, the conditions of the light bulb and ultraviolet irradiation are:

[0157] (1) Lamp irradiation: Place the sample on a turntable at a vertical height of 10 cm from the bulb. The bulb power is 300 W, the temperature is 50 °C, the turntable rotates at 2-4 rpm, and the irradiation time is 168 h.

[0158] (2) Ultraviolet irradiation: Place the sample at a vertical height of 10 cm from the ultraviolet lamp. The power of the ultraviolet lamp is 20 W and the irradiation time is 168 h.

[0159] The test conditions of the glide angle are:

[0160] Put three sample tubes in a group, with two tubes at the bottom and one tube at the top, and place them at an angle. When the heads of the sample tubes tilt downward and the tubes on top can slide down freely, test the angle between the tube bodies and the horizontal plane.

[0161] The test conditions for the adhesion are:

[0162] Use 3M tape to cover the surface of the sample, wait for 1 minute, then tear off the 3M tape along the angle of 45-90° and observe whether the sample surface has fallen off.

[0163] Based on the above, it can be seen that the matte plastic round tube and oiling system of the present invention have a wide range of applications, low cost and a very high market prospect.

[0164] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A matte plastic round tube, characterized in that: The matte plastic round tube is made of a plastic round tube through an oiling system; after being irradiated by a 300W bulb and a 20W ultraviolet ray for 168 hours, the matte plastic round tube has no obvious discoloration; the sliding angle of the matte plastic round tube in the smoothness test is 50-60°; after the matte plastic round tube is subjected to an adhesion test, there is no peeling phenomenon on the surface; and there is no roller separation line on the surface of the matte plastic round tube; according to the transportation direction of the plastic round tube, the oiling system comprises a printing machine (1) and an ultraviolet curing machine (2) in sequence; The printing machine (1) comprises an electrostatic dust removal device, a flame treatment device and a small oiling machine (3); The small oiling machine (3) is 280 mm long, 240 mm wide and 200-260 mm high; The small oil coating machine (3) comprises, from bottom to top, a base (31), a slide rail (32), a fixed seat (33), a support frame (34), a rounded oil tank (35), a stepped movable fixed plate (36), a square movable fixed plate (37), a rotary cylinder (38), a motor (39) and an oil coating roller; The slide rail (32) is located above the base (31), a ball screw is installed in the middle of the slide rail (32), and knobs are installed at the left and right ends of the ball screw for adjusting the forward and backward movement of the slide rail (32) on the base (31); The support frame (34) is fixed to the slide rail (32) via the fixing seat (33); the fixing seat (33) and the slide rail (32) are fixed via bolts; a fixing shaft is passed through the connection between the fixing seat (33) and the support frame (34); The slide rail (32) is a cross rail; The rotating cylinder (38) is located in the lower front of the support frame (34); an eccentric wheel is installed between the rotating cylinder (38) and the support frame (34); the rotating cylinder (38) is fixed to the slide rail (32) by bolts; the rotating cylinder (38) causes the support frame (34) to move up and down with the fixed axis on the fixed seat (33) as the center by doing work; the rotating cylinder (38) controls the support frame (34) to move up and down within a distance range of 60 mm; The support frame (34) is connected to the fixing seat (33) via a ball bearing, with the fixing shaft of the fixing seat (33) serving as a fulcrum; The oil coating rollers include, from front to back, a coating roller (301), a glue transfer roller (302), and a glue leveling roller (303); the horizontal height of the center of the glue leveling roller (303) is higher than the horizontal height of the center of the glue transfer roller (302); and the horizontal height of the center of the coating roller (301) is higher than the horizontal height of the center of the glue leveling roller (303).

2. The matte plastic round tube according to claim 1, characterized in that: A stepped movable fixed plate (36) is embedded in both left and right sides of the support frame (34); a square movable fixed plate (37) is embedded in the high step of the stepped movable fixed plate (36); two ends of the glue transfer roller (302) are fixed at the low step of the stepped movable fixed plate (36); two ends of the glue leveling roller (303) are fixed on the square movable fixed plate (37); and the moving directions of the stepped movable fixed plate (36) and the square movable fixed plate (37) are parallel to the support frame (34).

3. The matte plastic round tube according to claim 1, characterized in that: The stepped movable fixing plate (36) is provided with four knobs which are parallel to the stepped movable fixing plate (36) and protrude from the support frame (34), and are used to control the movement of the stepped movable fixing plate (36) and adjust the distance between the glue coating roller (301) and the glue transfer roller (302); and the square movable fixing plate (37) is provided with two knobs which are parallel to the square movable fixing plate (37) and protrude from the support frame (34), and are used to control the movement of the square movable fixing plate (37) and adjust the distance between the glue spreading roller (303) and the glue transfer roller (302).

4. The matte plastic round tube according to claim 1, characterized in that: The rounded oil groove (35) is located below the rubber transfer roller (302), the rounded oil groove (35) is "V"-shaped, the "V"-shaped angle of the rounded oil groove (35) is a rounded structure, the angle at the extension line of the rounded structure of the "V"-shaped angle of the rounded oil groove (35) is an obtuse angle, and the angle of the obtuse angle is 125°.

5. The matte plastic round tube according to claim 1, characterized in that: The inner walls on the left and right sides of the support frame (34) are provided with protrusions adapted to the rounded oil groove (35), the rounded oil groove (35) is supported on the protrusions on the inner walls on the left and right sides of the support frame (34), the front end of the rounded oil groove (35) protrudes from the front end of the support frame (34), and the rear end of the rounded oil groove (35) stops at the rear end of the rear wall of the support frame (34).

6. The matte plastic round tube according to claim 1, characterized in that: The glue coating roller (301) is made of polyurethane material, the glue transfer roller (302) is made of stainless steel material, and the glue leveling roller (303) is made of polyurethane material.

7. A method for preparing the matte plastic round tube according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1, conveying the plastic round tube to the above-mentioned printing machine (1) to first pass through an electrostatic dust removal device and a flame treatment device for dust removal and flame treatment; Step 2, adding matte oil into the rounded oil tank (35) through the front end of the rounded oil tank (35) of the small oil coating machine (3), adjusting the thickness of the matte oil by adjusting the knobs connected to the stepped movable fixed plate (36) and the square movable fixed plate (37), turning on the motor (39) to control the rotation speed of the glue coating roller (301), the glue transfer roller (302) and the glue leveling roller (303), transferring the plastic round tube after dust removal and flame treatment in step 1 to the top of the small oil coating machine (3) parallel to the glue coating roller (301), adjusting the rotating cylinder (38) to raise the support frame (34), making the glue coating roller (301) tangent to the plastic round tube, and the plastic round tube and the glue coating roller (301) rotate in opposite directions to be oiled, thereby obtaining an oiled round tube; Step 3: conveying the oil-coated round tube to the above-mentioned ultraviolet curing machine (2) for curing to obtain the matte plastic round tube.

8. The preparation method according to claim 7, characterized in that: The plastic round tube in step 1 is one or more of a polyvinyl chloride round tube, a polyethylene terephthalate round tube or a polyethylene round tube.

9. The preparation method according to claim 7, characterized in that: In step 2, the glue coating roller (301) rotates at the same linear speed as the plastic round tube.

10. The preparation method according to claim 7, characterized in that: The rotation number of the plastic tube in step 2 is 2 and a half turns.

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