Nonwoven fabric embossing device and method

Abstract

A nonwoven fabric embossing device and method comprises two parallel hot-rollers connected by a gear transmission. A first rotary joint and a second rotary joint are mounted at each end of the hot-rollers. The outer tube of the first rotary joint and the hollow shaft of the second rotary joint are connected to a heating hole and a pressurizing hole, respectively, at each end of the hot-rollers. An oil inlet pipe connected to the inner tube of the first rotary joint is disposed within the heating hole. A embossing tube is disposed outside the hot-rollers. Both ends of the embossing tube are fixedly connected to sealing sleeves disposed at both ends of the hot-rollers. The gap between the embossing tube and the hot-rollers is connected to the pressurizing hole via multiple liquid inlet holes. The liquid inlet of the second rotary joint is connected to an oil carrier. The present invention addresses the problem of poor thermal bonding performance of existing embossing tubes.

Description

Technical Field

[0001] The invention belongs to the technical field of protective product production, and particularly relates to a non-woven fabric embossing device and method. Background Art

[0002] Some medical fabrics require multiple layers of nonwoven fabric to be formed through hot-rolling and bonding. Existing embossing tubes utilize a double-roller structure. Hydraulic oil is fed into the embossing tubes, causing them to expand and deform, thereby adjusting the gap between the rollers to achieve thermal bonding of the nonwoven fabric. Currently, during the operation of the two embossing tubes, one embossing tube is required to have a concave center, while the other expands. This compensates for the difference and achieves the desired thermal bonding. However, this existing double-roller structure has several drawbacks: Since the concave center embossing tube only receives hot oil, but no hydraulic oil, the concave center roller cannot deform. When hydraulic oil is fed into the expanding center embossing tube, the hydraulic oil is fed into the center of the expanding center embossing tube, resulting in poor compression deformation. The overall expansion of the expanding center embossing tube is minimal, resulting in insufficient thermal bonding in the center of the nonwoven fabric and excessive thermal bonding on both sides, resulting in poor overall thermal bonding. Furthermore, since only the concave center embossing tube conducts heat, the thermal bonding effect on both sides of the nonwoven fabric is uneven, resulting in poor bonding of the multiple layers. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a non-woven fabric embossing device and method, which are used to solve the problem that the existing embossing tube has a poor thermal bonding effect.

[0004] In order to solve the above problems, the technical solution of the present invention is:

[0005] The non-woven fabric embossing device includes two parallel hot-rolling rollers, which are connected by gear transmission. A first rotary joint and a second rotary joint are respectively installed at both ends of the hot-rolling roller. The outer tube of the first rotary joint and the hollow shaft of the second rotary joint are respectively connected to the heating hole and the pressurizing hole arranged at both ends of the hot-rolling roller. An oil inlet pipe connected to the inner tube of the first rotary joint is provided in the heating hole. A embossing tube is provided on the outer sleeve of the hot-rolling roller. The two ends of the embossing tube are respectively fixedly connected to the sealing sleeves on the outer sleeves of the hot-rolling roller. The gap between the embossing tube and the hot-rolling roller is connected to the pressurizing hole through multiple liquid inlet holes. The liquid inlet of the second rotary joint is connected to the oil carrying device.

[0006] The oil carrying device includes a single-acting cylinder, one end of the single-acting cylinder is connected to the oil cylinder, the diameter of the oil cylinder is smaller than the diameter of the single-acting cylinder, the piston rod in the single-acting cylinder is connected to the piston in the oil cylinder, the rodless chamber of the oil cylinder is connected to the liquid inlet of the second rotary joint through a hydraulic oil pipe, the single-acting cylinder is connected to the air source through an air intake pipe, a servo valve is installed on the air intake pipe, a laser ranging sensor is provided above the ginned cotton tube, the laser ranging sensor is connected to the input end of the controller, and the controller controls the servo valve.

[0007] A first pressure sensor is installed on the hydraulic oil pipe and is connected to an input end of the controller.

[0008] A plurality of heat conduction holes are provided in the hot rolling roller, and the heat conduction holes are evenly distributed around the heating hole. Both ends of the heat conduction holes are connected with both ends of the heating hole through an oil inlet hole and an oil outlet hole respectively.

[0009] The multi-layer non-woven fabric passes between two hot embossing rollers. At the same time, hot pressing oil enters the hot embossing rollers through the first rotary joint to heat the embossing tube to a specified temperature. The controller controls the servo valve to send compressed air into two single-acting cylinders. The two single-acting cylinders drive the two embossing tubes to expand and contract respectively. The two embossing tubes perform hot embossing on the multi-layer non-woven fabric. During the hot embossing process, the laser ranging sensor detects the diameter of the embossing tube in real time and transmits the detected signal to the controller. The controller controls the servo valve to maintain the diameter of the embossing tube within the set range.

[0010] The beneficial effects of the present invention are as follows: the shapes of the two embossing tubes can be adjusted by adjusting the cylinder, thereby increasing the deformation of the embossing tubes. In addition, the liquid-gas combination of the hot embossing roller makes the hot pressing surface of the embossing tube have a certain elasticity, and its shape can be changed according to the deformation requirements of the embossing tube, ensuring that the non-woven fabric can be fully hot-pressed and embossed as a whole. On the other hand, the existing single-sided heating of the non-woven fabric is changed to double-sided heating, so that the non-woven fabric is heated more evenly, thereby greatly improving the thermal bonding effect of the non-woven fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings:

[0012] Figure 1 It is a structural schematic diagram of the present invention,

[0013] Figure 2 It is a partial structural diagram of the present invention,

[0014] Figure 3 Schematic diagram of the connection relationship of various electrical components of the present invention.

[0015] In the figure: first rotary joint 1, hot rolling roller 2, heating hole 3, oil inlet pipe 4, heat conduction hole 5, embossing tube 6, laser ranging sensor 7, sealing sleeve 8, pressurizing hole 9, gear 10, second rotary joint 11, first pressure sensor 12, hydraulic oil pipe 13, oil cylinder 14, single-acting cylinder 15, second pressure sensor 16, servo valve 17, liquid inlet hole 18. DETAILED DESCRIPTION

[0016] The nonwoven fabric embossing device includes two parallel hot rollers 2, which are connected by a gear 10. A first rotary joint 1 and a second rotary joint 11 are installed at both ends of the hot roller 2. The first rotary joint 1 is a two-flow channel rotary joint, and the second rotary joint 11 is a single-flow channel rotary joint. The outer tube of the first rotary joint 1 and the hollow shaft of the second rotary joint 11 are respectively connected to the heating hole 3 and the pressurizing hole 9 provided at both ends of the hot roller 2. An oil inlet pipe 4 connected to the inner tube of the first rotary joint 1 is provided in the heating hole 3. A embossing tube 6 is provided on the outer shell of the hot roller 2, and the surface of the embossing tube 6 has convex points. Or clause, the hot rolling roller 2 is a stepped shape with a thick middle and thin ends, and a sealing sleeve 8 is respectively provided on both ends of the hot rolling roller 2, and a sealing ring is provided between the sealing sleeve 8 and the hot rolling roller 2. The two ends of the ginning tube 6 are fixedly connected with the sealing sleeve 8 at both ends of the hot rolling roller 2, and the thickness of the sealing sleeve 8 is greater than the thickness of the ginning tube 6. When the ginning tube 6 expands or contracts, the ginning tube 6 pulls the sealing sleeve 8 along the hot rolling roller 2 to move axially. The gap between the ginning tube 6 and the hot rolling roller 2 is connected to the pressurized hole 9 through multiple liquid inlet holes 18, and the liquid inlet of the second rotary joint 11 is connected to the oil carrying device. The expansion and contraction of the ginning tube 6 are both 1mm.

[0017] The oil-carrying device includes a single-acting cylinder 15, one end of which is connected to the oil cylinder 14. The diameter of the oil cylinder 14 is smaller than that of the single-acting cylinder 15. The piston rod in the single-acting cylinder 15 is connected to the piston in the oil cylinder 14. The rodless cavity of the oil cylinder 14 is connected to the liquid inlet of the second rotary joint 11 through the hydraulic oil pipe 13. The single-acting cylinder 15 is connected to the air source through the air intake pipe. A servo valve 17 is installed on the air intake pipe. A laser ranging sensor 7 is provided above the coined tube 6. The laser ranging sensor 7 is connected to the input end of the controller, and the controller controls the servo valve 17. The laser ranging sensor 7 can be selected from the "Wuxi Hongchuan HC-LTP150 laser ranging sensor 7", which has an accuracy of 1.6um. The controller can be selected from a PLC controller. The servo valve 17 is equipped with a second pressure sensor. The controller inputs a certain command signal to the servo valve 17. Through energy conversion and amplification, the compressed air in the single-acting cylinder 15 reaches a certain preset value. When the air pressure changes, the second pressure sensor generates a feedback signal, which is compared with the input command, and then eliminates the contrast between the command signal and the feedback signal, so that the single-acting cylinder 15 maintains a constant pressure.

[0018] A first pressure sensor 12 is mounted on the hydraulic oil pipe 13. The first pressure sensor 12 and a second pressure sensor 16 are connected to the controller input. The first pressure sensor 12 is used to detect the pressure of the hydraulic oil in the gap between the ginning tube 6 and the hot rolling roller 2 to prevent the ginning tube 6 from bursting due to excessive hydraulic oil pressure in the gap between the ginning tube 6 and the hot rolling roller 2.

[0019] A plurality of heat conducting holes 5 are provided in the hot rolling roller 2 , and the heat conducting holes 5 are evenly distributed around the heating hole 3 . Both ends of the heat conducting holes 5 are connected to both ends of the heating hole 3 through an oil inlet hole and an oil outlet hole respectively. This structure can evenly distribute the hot oil to the hot rolling roller 2, so that the hot rolling roller 2 can be heated more evenly. In addition, a single-acting cylinder 15 is used to push the oil cylinder 14 to pressurize the ginning tube 6. On the one hand, this is because the heat conduction effect of hydraulic oil is better than that of air. At the same time, the hydraulic oil always stays in the gap between the ginning tube 6 and the hot rolling roller 2 to avoid heat loss caused by the hydraulic oil needing to return to the oil tank; on the other hand, the cylinder is used as the power to drive the hydraulic oil because the cylinder is more elastic than the oil cylinder 14 and has a certain buffering function. When an abnormal situation occurs, such as the stacking of non-woven fabrics, the thickened stacked non-woven fabrics will squeeze the ginning tube 6. At this time, the squeezed ginning tube 6 will push the cylinder to move through the oil cylinder 14, and the cylinder will buffer it, thereby ensuring that the ginning tube 6 has a certain overload shrinkage to prevent the sudden thickening of the non-woven fabric from crushing the ginning tube 6.

[0020] The working process of the present invention is:

[0021] Step 1: The multi-layer nonwoven fabric passes through the gap between the upper and lower embossing tubes 6. At the same time, hot pressing oil enters the hot calendering roller 2 from the first rotary joint 1 to heat the surfaces of the upper and lower embossing tubes 6 to a specified temperature.

[0022] Step 2: The controller controls the servo valve 17 to send compressed air into the two single-acting cylinders 15. The upper single-acting cylinder 15 draws hydraulic oil out of the gap between the upper embossing tube 6 and the upper hot-rolling roller 2, forcing the middle of the upper embossing tube 6 to shrink inward; the lower single-acting cylinder 15 presses hydraulic oil into the gap between the lower embossing tube 6 and the upper hot-rolling roller 2, forcing the middle of the lower embossing tube 6 to expand outward. The embossing tube 6 of this shape is used to hot-roll the multi-layer non-woven fabric.

[0023] Step 3: During the hot embossing of the nonwoven fabric by the two embossing tubes 6, the two laser ranging sensors 7 detect the diameters of the upper and lower layers of the embossing tubes 6 in real time and transmit the signals to the controller. The controller adjusts the air pressure in the single-acting cylinder 15 by controlling the servo valve 17 to adjust the pressure of the hydraulic oil in the gap between the embossing tube 6 and the hot rolling roller 2 to maintain the diameters of the upper and lower embossing tubes 6 within the set range.

Claims

1. A nonwoven fabric embossing device, comprising two parallel hot embossing rollers (2), the two hot embossing rollers (2) being connected to each other via a gear (10), characterized in that: A first rotary joint (1) and a second rotary joint (11) are respectively installed at both ends of the hot rolling roller (2). The outer tube of the first rotary joint (1) and the hollow shaft of the second rotary joint (11) are respectively connected to the heating hole (3) and the pressurizing hole (9) provided at both ends of the hot rolling roller (2). An oil inlet pipe (4) connected to the inner tube of the first rotary joint (1) is provided in the heating hole (3). A coining tube (6) is provided on the outer sleeve of the hot rolling roller (2). Both ends of the coining tube (6) are respectively fixedly connected to the sealing sleeves (8) provided on the outer sleeve of the hot rolling roller (2). The gap between the coining tube (6) and the hot rolling roller (2) is connected to the pressurizing hole (9) through a plurality of liquid inlet holes (18). The liquid inlet of the second rotary joint (11) is connected to the oil carrying device.

2. The nonwoven fabric embossing device according to claim 1, characterized in that: The oil carrying device comprises a single-acting cylinder (15), one end of the single-acting cylinder (15) is connected to the oil cylinder (14), the diameter of the oil cylinder (14) is smaller than the diameter of the single-acting cylinder (15), the piston rod in the single-acting cylinder (15) is connected to the piston in the oil cylinder (14), the rodless cavity of the oil cylinder (14) is connected to the liquid inlet of the second rotary joint (11) through the hydraulic oil pipe (13), the single-acting cylinder (15) is connected to the air source through the air intake pipe, a servo valve (17) is installed on the air intake pipe, a laser distance sensor (7) is provided above the coining tube (6), the laser distance sensor (7) is connected to the input end of the controller, and the controller controls the servo valve (17).

3. The nonwoven fabric embossing device according to claim 2, characterized in that: A first pressure sensor (12) is installed on the hydraulic oil pipe (13), and the first pressure sensor (12) is connected to the input end of the controller.

4. The nonwoven fabric embossing device according to any one of claims 1 to 3, characterized in that: A plurality of heat conduction holes (5) are provided in the hot rolling roller (2), and the heat conduction holes (5) are evenly distributed around the heating hole (3). Both ends of the heat conduction holes (5) are connected to both ends of the heating hole (3) through an oil inlet hole and an oil outlet hole, respectively.

5. A method for using the nonwoven fabric embossing device according to claim 2 or 3, characterized in that: The multi-layer non-woven fabric passes between two embossing tubes (6), and at the same time, hot pressing oil enters the hot embossing roller (2) from the first rotary joint (1) to heat the embossing tube (6) to a specified temperature. The controller controls the servo valve (17) to send compressed air into two single-acting cylinders (15). The two single-acting cylinders (15) respectively drive the two embossing tubes (6) to expand and contract, so as to perform hot embossing on the multi-layer non-woven fabric. During the hot embossing process, the laser ranging sensor (7) detects the diameter of the embossing tube (6) in real time and transmits the detected signal to the controller. The controller controls the servo valve (17) to maintain the diameter of the embossing tube (6) within a set range.

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