Preparation process of high water-absorbing brain cotton sheet

Abstract

The purpose of this invention is to disclose a process for preparing highly absorbent brain cotton pads, relating to the field of brain cotton preparation technology, including the following steps: preparing a hydrophilic spunlace nonwoven fabric layer; mixing sodium polyacrylate superabsorbent resin powder and fluffy cotton fibers in a mass ratio of (3~5):1, and molding them by molding or air-flow web forming process to form a superabsorbent preform layer; laying the mesh layer on the surface of the superabsorbent preform layer; hot-pressing the mesh layer and the superabsorbent preform layer together by a first hot-pressing process to form a superabsorbent composite layer; laying annular development lines around the edge of the superabsorbent composite layer to form a superabsorbent intermediate layer; bonding the superabsorbent intermediate layer and the hydrophilic spunlace nonwoven fabric layers on its two surfaces together by a second hot-pressing process to obtain a brain cotton pad substrate; hot-pressing the edge of the brain cotton pad substrate by a third hot-pressing process to form annular hot-pressing zones. The beneficial effect is that the brain cotton pad can absorb no less than 4.5 times its own weight in blood or body fluids.

Description

Technical Field

[0001] This invention relates to the field of brain cotton preparation technology, and in particular to a process for preparing highly absorbent brain cotton sheets. Background Technology

[0002] In neurosurgery, swabs are used to absorb fluid and stop bleeding, ensuring a clear surgical field while protecting normal nerves and blood vessels from damage. However, existing swabs have several problems. First, traditional swabs are usually made of degreased cotton fibers or non-woven fibers, which are prone to pilling, shedding, and dust during use. Especially in neurosurgery, these shed materials may cause additional damage to the brain, spinal cord, and nerve tissue, posing a serious safety hazard. Second, the absorbency of existing swabs needs improvement; they cannot quickly and in large quantities absorb blood and tissue fluid seeping from the surgical wound, affecting the surgical field and prolonging the operation time. In addition, the mechanical properties of existing swabs deteriorate after being soaked, like a wet tissue, lacking the support to maintain their original shape, making them difficult to handle and accurately position, and prone to displacement during use.

[0003] Therefore, there is an urgent need to develop a process for preparing highly absorbent cerebral cotton pads to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to disclose a process for preparing highly absorbent brain cotton pads.

[0005] To achieve the above-mentioned objectives, this invention provides a process for preparing highly absorbent cervical cotton pads, comprising the following steps: Prepare a hydrophilic spunlace nonwoven fabric layer; Sodium polyacrylate superabsorbent resin powder and fluffy cotton fiber are mixed evenly in a mass ratio of (3~5):1, and then formed by molding or air-flow web forming process to make a superabsorbent body layer. Medical-grade polyester fibers are made into a mesh layer through a textile process. The mesh layer has a mesh size of 1mm-3mm. The mesh layer is then laid on the surface of the super absorbent preform layer. The mesh layer and the high water-absorbing blank layer are hot-pressed together by a first hot-pressing process to form a high water-absorbing composite layer. A ring-shaped development line is laid around the edge of the super absorbent composite layer to form a super absorbent intermediate layer; The super absorbent intermediate layer and the hydrophilic spunlace nonwoven fabric layers on its two surfaces are composited by a second hot-pressing process to obtain the brain cotton sheet substrate; The brain cotton pad is obtained by hot-pressing the edge of the brain cotton pad substrate through a third hot-pressing process to form an annular hot-pressing zone.

[0006] Preferably, the hydrophilic spunlace nonwoven layer is made of cotton fiber or viscose fiber.

[0007] Preferably, the moisture content of the highly absorbent preform layer is less than 5%.

[0008] Preferably, the hot pressing temperature of the first hot pressing process is 120℃~150℃, the hot pressing pressure is 0.5MPa~1MPa, and the hot pressing time is 5min~10min.

[0009] Preferably, the hot pressing temperature of the second hot pressing process is 100℃~130℃, the hot pressing pressure is 0.3MPa~0.8MPa, and the hot pressing time is 3min~8min.

[0010] Preferably, the hot pressing temperature of the third hot pressing process is 180℃~220℃, the hot pressing pressure is 1MPa~2MPa, and the hot pressing time is 2s~5s.

[0011] Preferably, the diameter of the annular developing line is 0.5 mm to 0.7 mm.

[0012] Preferably, the annular developing lines are provided with cross-shaped or star-shaped developing lines.

[0013] Preferably, the method further includes the following steps: A strip of silicone is adhered to the end of the cotton pad. The first side of the silicone strip is provided with a medical adhesive layer and a self-adhesive layer, and the second side of the silicone strip is provided with an anti-slip layer.

[0014] Preferably, a traction hole is provided at the end of the silicone strip, and a pull wire is provided in the traction hole.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) The front and back sides of the brain cotton pad prepared by the present invention are both hydrophilic spunlace nonwoven fabric layers. This kind of spunlace nonwoven fabric has good hydrophilicity and can allow water to pass through quickly. The spunlace nonwoven fabric layer is a nonwoven fabric formed by entanglement of fibers by high pressure water needles. It will not cause shedding, hair loss, or short fiber shedding during use.

[0016] (2) Sodium polyacrylate superabsorbent polymer has extremely high water absorption capacity, with a water absorption ratio of up to hundreds of times its own weight, which can quickly absorb a large amount of blood and tissue fluid seeping from the surgical wound. The fluffy cotton fibers can serve as a three-dimensional network skeleton to provide support for the brain cotton pad as a whole and maintain its shape. On the other hand, they also have a certain degree of water absorption, working synergistically with sodium polyacrylate superabsorbent polymer.

[0017] (3) Medical grade polyester fiber has high strength and flexibility. The grid layer is hot-pressed on the surface of the super absorbent body layer in a crisscross pattern. This not only enhances the mechanical properties of the brain cotton pad after it is soaked, so that it can still maintain a certain shape and strength after absorbing a large amount of liquid, but also makes it easy for medical staff to handle and operate. It can effectively prevent the brain cotton pad from breaking due to uneven force during use.

[0018] (4) The ring-shaped imaging line is distributed in a ring shape along the edge of the brain cotton patch. With the help of an X-ray projector, it is possible to clearly explore whether there is any brain cotton patch left in the brain at the end of the operation and before closing the skull, which can effectively avoid leaving brain cotton patch in the brain and improve the safety of the operation.

[0019] (5) The edge of the brain cotton pad substrate is formed into an annular hot-pressing zone to obtain the brain cotton pad, ensuring that the materials of each layer at the edge of the brain cotton pad are tightly bonded to prevent separation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the preparation process of the super absorbent brain cotton pad of the present invention.

[0021] Figure 2 This is a schematic diagram of the developing line arrangement of the present invention.

[0022] Figure 3 This is a cross-sectional schematic diagram of the brain cotton pad of the present invention.

[0023] Figure 4 This is a top view schematic diagram of the brain cotton pad of the present invention.

[0024] Figure 5 This is a cross-sectional schematic diagram of the strip-shaped silicone strip of the present invention.

[0025] Figure 6 This is a table showing the key parameters and performance test results of the brain cotton pad preparation process of the present invention.

[0026] Among them, 1. Circular imaging line; 11. Cross-shaped imaging line (star-shaped imaging line); 2. Brain cotton pad; 3. Brain cotton pad base; 31. Hydrophilic spunlace nonwoven fabric layer; 32. High absorbency intermediate layer; 33. Hydrophilic spunlace nonwoven fabric layer; 34. Circular hot-pressing zone; 4. Absorbent composite layer; 5. Silicone strip; 51. Medical adhesive layer; 52. Self-adhesive layer; 53. Anti-slip layer; 54. Traction hole; 55. Pulling line. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0029] The following elaborates on the specific implementation process of the present invention through multiple embodiments. Embodiment 1

[0030] Refer Figure 1 As shown, this embodiment discloses a specific implementation manner of a preparation process for a highly absorbent brain cotton sheet.

[0031] For the preparation process of the highly absorbent brain cotton sheet, refer Figure 1 As shown, it includes the following steps: Step S1: Prepare a hydrophilic spunlace non-woven fabric layer; specifically, the material of the hydrophilic spunlace non-woven fabric layer is cotton fiber or viscose fiber. The spunlace non-woven fabric layer is a non-woven fabric formed by entangling fibers with high-pressure water jets. During use, there will be no phenomena such as hair loss, fluff shedding, or short fiber shedding. This type of spunlace non-woven fabric has good hydrophilicity and can allow water to pass through quickly.

[0032] Step S2: Mix the sodium polyacrylate superabsorbent resin powder and fluffy cotton fiber evenly according to the mass ratio of (3 - 5):1, and form it into a highly absorbent blank layer through a molding or airlaid process; specifically, the sodium polyacrylate superabsorbent resin has extremely high water absorption capacity, and its water absorption ratio can reach hundreds of times its own weight, and it can quickly absorb a large amount of blood and tissue fluid exuded from the surgical wound surface; the fluffy cotton fiber can, on the one hand, serve as a three-dimensional network framework to provide support for the overall brain cotton sheet and maintain the shape of the brain cotton sheet, and on the other hand, it also has a certain water absorption capacity and acts synergistically with the sodium polyacrylate superabsorbent resin; the highly absorbent blank layer obtained in step S2 is dried to ensure that the moisture content of the highly absorbent blank layer is less than 5%.

[0033] Step S3: Make a grid layer from medical-grade polyester fiber filaments through a textile process. The grid aperture of the grid layer is 1 mm - 3 mm, and lay the grid layer on the surface of the highly absorbent blank layer; specifically, the medical-grade polyester fiber has relatively high strength and flexibility. When laying, the grid layer should cover the entire highly absorbent blank layer.

[0034] Step S4: The mesh layer and the superabsorbent blank layer are hot-pressed together using a first hot-pressing process to form a superabsorbent composite layer. Specifically, the hot-pressing temperature of the first hot-pressing process is 120℃~150℃, the hot-pressing pressure is 0.5MPa~1MPa, and the hot-pressing time is 5min~10min. Through the first hot-pressing process, the mesh layer is hot-pressed onto the surface of the superabsorbent blank layer in a crisscross pattern. This not only enhances the mechanical properties of the cotton pad after it is soaked, allowing it to maintain a certain shape and strength after absorbing a large amount of liquid, but also makes it easier for medical staff to handle and operate. It can effectively prevent the cotton pad from breaking due to uneven stress during use.

[0035] Step S5: Lay annular development lines around the edge of the superabsorbent composite layer to form a superabsorbent intermediate layer; specifically, see Figure 2 The annular imaging line 1 is distributed in a ring shape along the edge of the superabsorbent composite layer 4. Before the end of the operation and before the skull is closed, an X-ray projector can be used to clearly examine whether there are any cotton pads left in the skull, effectively avoiding the retention of cotton pads in the skull and improving the safety of the operation. The annular imaging line 1 is preferably an imaging line containing barium sulfate. The annular imaging line 1 is provided with a cross-shaped imaging line 11 or a star-shaped imaging line 11. The diameter of the annular imaging line 1, the cross-shaped imaging line 11, and the star-shaped imaging line 11 is 0.5mm~0.7mm. The annular imaging line 1, the cross-shaped imaging line 11, and the star-shaped imaging line 11 are adhered to the surface of the superabsorbent intermediate layer with medical adhesive.

[0036] Step S6: The highly absorbent intermediate layer and the hydrophilic spunlace nonwoven fabric layers on its two surfaces are laminated using a second hot-pressing process to obtain the brain cotton sheet substrate; specifically, see Figure 3 The brain cotton pad substrate 3 comprises, from bottom to top, a hydrophilic spunlace nonwoven fabric layer 31, a highly absorbent intermediate layer 32, and a hydrophilic spunlace nonwoven fabric layer 33. The hot pressing temperature of the second hot pressing process is 100℃~130℃, the hot pressing pressure is 0.3MPa~0.8MPa, and the hot pressing time is 3min~8min. The three layers of materials, namely the hydrophilic spunlace nonwoven fabric layer 31, the highly absorbent intermediate layer 32, and the hydrophilic spunlace nonwoven fabric layer 33, are composited together through the second hot pressing process to form the brain cotton pad substrate 3.

[0037] Step S7: The edge of the brain cotton pad substrate is hot-pressed through a third hot-pressing process to form an annular hot-pressing zone 34, thereby obtaining the brain cotton pad 2. Specifically, the hot-pressing temperature of the third hot-pressing process is 180℃~220℃, the hot-pressing pressure is 1MPa~2MPa, and the hot-pressing time is 2s~5s. Through the third hot-pressing process, the edge of the brain cotton pad substrate 3 is formed into an annular hot-pressing zone 34, thereby obtaining the brain cotton pad. This ensures that the materials of each layer at the edge of the brain cotton pad are tightly bonded to prevent separation, especially to prevent the brain cotton pad from delaminating after being soaked.

[0038] In this embodiment, the prepared brain cotton pad has good hydrophilicity, and blood or body fluid can quickly penetrate through the hydrophilic spunlace nonwoven fabric layer 31 and be absorbed by the highly absorbent intermediate layer 32. The brain cotton pad can absorb no less than 4.5 times its own weight of blood or body fluid, effectively maintaining a clear surgical field and shortening the operation time.

[0039] The upper and lower surfaces of the brain cotton pad are made of hydrophilic spunlace nonwoven fabric 31, which will not cause shedding, hair loss, or short fiber shedding, thus avoiding additional damage to brain tissue. At the same time, the surface of the highly absorbent intermediate layer 32 is also covered with ring-shaped imaging lines 1, cross-shaped imaging lines 11, or star-shaped imaging lines 11. With the help of an X-ray projector, it is possible to clearly detect whether there is any brain cotton pad left in the skull, effectively preventing brain cotton pads from being left in the skull and improving the safety of the operation.

[0040] The crisscrossing high-strength fiber mesh layer inside the brain cotton pad significantly enhances its mechanical properties after soaking, allowing it to maintain a certain shape and strength even after absorbing a large amount of liquid. This makes it easy for medical staff to handle and operate, and prevents displacement or breakage.

[0041] To further improve the ease of use of the brain cotton pads, the preparation process of the highly absorbent brain cotton pads also includes the following steps: Step S8: See Figure 4 A strip of silicone 5 is adhered to the end of the cotton pad 2, see [reference]. Figure 5 The silicone strip 5 has a medical adhesive layer 51 and a non-adhesive layer 52 on its first side, and an anti-slip layer 53 on its second side. The anti-slip layer 53 provides friction when the doctor holds the silicone strip 5 or when it is clamped by a medical device, making it less likely for the cotton pad 2 to fall off. The end of the silicone strip 5 has a traction hole 54, and a traction wire 55 is set in the traction hole 54. The traction wire 55 is preferably a radiopaque wire containing barium sulfate. The strip silicone strip 5 extends beyond the cotton pad 2. When the doctor needs to use the medical adhesive layer 51, the non-adhesive layer 52 can be peeled off to expose the medical adhesive layer 51. The doctor can then use a medical device to adhere the medical adhesive layer 51, thus facilitating the movement of the cotton pad 2. Alternatively, the cotton pad 2 can be moved using the traction wire 55, making the use of the cotton pad 2 more flexible and convenient.

[0042] See Figure 6 , Figure 6This is a table of key parameters and performance tests for the preparation process of brain cotton pads. Brain cotton pads numbered 1 to 3, using the parameters of steps S1 to S7 in Example 1, exhibit a pure water adsorption rate of up to 5.5 times their own weight. They do not separate after soaking in pure water for 3 hours, especially in the annular hot-pressing zone 34, ensuring the stability and safety of the brain cotton pads after soaking. In brain cotton pad number 4, the mass ratio of sodium polyacrylate superabsorbent resin powder to fluffy cotton fiber is 2:1, indicating insufficient sodium polyacrylate superabsorbent resin powder. Other parameters are used according to steps S1 to S7 in Example 1, such as those for number 1. The resulting brain cotton pads exhibit a pure water adsorption rate of up to 4 times their own weight, which does not meet the requirements. High water absorption; In the brain cotton pad of serial number 5, the hot pressing temperature of the third hot pressing process was 150℃, that is, the hot pressing temperature of the annular hot pressing zone 34 was insufficient. Other parameters according to steps S1 to S7 of Example 1, such as the parameters of serial number 2, resulted in a brain cotton pad with a pure water adsorption ratio that met the requirements. However, after soaking in pure water for 3 hours, the annular hot pressing zone 34 showed stratification, posing a safety hazard. In the brain cotton pad of serial number 6, the hot pressing temperature of the third hot pressing process was 150℃, that is, the hot pressing temperature of the annular hot pressing zone 34 was insufficient. Other parameters according to steps S1 to S7 of Example 1, such as the parameters of serial number 3, resulted in a brain cotton pad with a pure water adsorption ratio that met the requirements. However, after soaking in pure water for 3 hours, the annular hot pressing zone 34 showed stratification, posing a safety hazard.

Claims

1. A process for preparing highly absorbent cervical cotton pads, characterized in that, Includes the following steps: Prepare a hydrophilic spunlace nonwoven fabric layer; Sodium polyacrylate superabsorbent resin powder and fluffy cotton fiber are mixed evenly in a mass ratio of (3~5):1, and then formed by molding or air-flow web forming process to make a superabsorbent body layer. Medical-grade polyester fibers are made into a mesh layer through a textile process. The mesh layer has a mesh size of 1mm-3mm. The mesh layer is then laid on the surface of the super absorbent preform layer. The mesh layer and the high water-absorbing blank layer are hot-pressed together by a first hot-pressing process to form a high water-absorbing composite layer. A ring-shaped development line is laid around the edge of the super absorbent composite layer to form a super absorbent intermediate layer; The super absorbent intermediate layer and the hydrophilic spunlace nonwoven fabric layers on its two surfaces are composited by a second hot-pressing process to obtain the brain cotton sheet substrate; The brain cotton pad is obtained by hot-pressing the edge of the brain cotton pad substrate through a third hot-pressing process to form an annular hot-pressing zone.

2. The preparation process of the highly absorbent cervical cotton pad as described in claim 1, characterized in that, The hydrophilic spunlace nonwoven fabric layer is made of cotton fiber or viscose fiber.

3. The preparation process of the highly absorbent cervical cotton pad as described in claim 1, characterized in that, The moisture content of the highly absorbent preform layer is less than 5%.

4. The preparation process of the highly absorbent cervical cotton pad as described in any one of claims 1-3, characterized in that, The hot pressing temperature of the first hot pressing process is 120℃~150℃, the hot pressing pressure is 0.5MPa~1MPa, and the hot pressing time is 5min~10min.

5. The preparation process of the highly absorbent cervical cotton pad as described in claim 4, characterized in that, The second hot pressing process has a hot pressing temperature of 100℃~130℃, a hot pressing pressure of 0.3MPa~0.8MPa, and a hot pressing time of 3min~8min.

6. The preparation process of the highly absorbent cervical cotton pad as described in claim 5, characterized in that, The hot pressing temperature of the third hot pressing process is 180℃~220℃, the hot pressing pressure is 1MPa~2MPa, and the hot pressing time is 2s~5s.

7. The preparation process of the highly absorbent cervical cotton pad as described in claim 4, characterized in that, The diameter of the annular developing line is 0.5 mm to 0.7 mm.

8. The preparation process of the highly absorbent cervical cotton pad as described in claim 4, characterized in that, The annular developing line contains cross-shaped or star-shaped developing lines.

9. The preparation process of the highly absorbent cervical cotton pad as described in claim 4, characterized in that, It also includes the following steps: A strip of silicone is adhered to the end of the cotton pad. The first side of the silicone strip is provided with a medical adhesive layer and a self-adhesive layer, and the second side of the silicone strip is provided with an anti-slip layer.

10. The preparation process of the highly absorbent cervical cotton pad as described in claim 4, characterized in that, The silicone strip has a traction hole at its end, and a pull wire is installed in the traction hole.

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