Liquid absorbing surface layer, sanitary towel with surface layer and preparation method of liquid absorbing surface layer

Abstract

The invention relates to a liquid absorbing surface layer, a sanitary napkin with the liquid absorbing surface layer and a preparation method of the sanitary napkin, the upper surface of a PE-PET hot air non-woven fabric base layer of the liquid absorbing surface layer is a skin-friendly surface, an oil agent is coated on the skin-friendly surface in a strip shape along the length direction CD of the PE-PET hot air non-woven fabric base layer, the oil agent is a waxy substance at 25 DEG C, the contact angle is 109-116 degrees, and the oil agent is an oil agent. The width of each oiling agent is A mm, a gap of B mm is formed between every two adjacent oiling agents, and the gap is Alt; b. The oil agent is waxy at normal temperature, so that the performance of the oil agent is more stable, and the oil agent can be stably arranged on a skin-friendly surface before the oil agent is used by a user within the shelf life. In the using process, liquid falling on the surface layer rapidly falls into the PE-PET hot air non-woven fabric base layer and is absorbed by the lower layer material, the skin-friendly surface and the oil agent surface are kept dry and comfortable, and meanwhile it is guaranteed that oil agent components can be effectively transferred to the skin when the oil agent makes contact with the skin.

Description

Technical Field

[0001] The invention relates to the technical field of liquid absorption, in particular to a liquid absorption surface layer and a sanitary napkin having the surface layer and a preparation method thereof. Background Art

[0002] As a personal hygiene product, the design and manufacture of sanitary napkins have been striving to improve the comfort and protection during use. Traditional sanitary napkins are usually composed of multiple layers, including a top layer (surface layer) for contacting the skin, a middle layer for absorbing body fluids, and a bottom layer for preventing liquid migration. The material and structure of the surface layer are crucial because it is in direct contact with the user's skin and must quickly transfer fluid to keep the surface dry. Previous technologies have disclosed a variety of surface layer processing methods, such as applying an oil agent to the surface of the surface non-woven fabric or fiber to improve the dryness and skin protection of the surface layer.

[0003] Such oils are usually water-repellent substances, which, after coating, will lead to a contradiction between liquid absorbency and skin care properties, thereby causing liquid to flow out from the sides of the sanitary napkin. Summary of the invention

[0004] The present invention provides a liquid absorbing surface layer. A sanitary napkin prepared with the surface layer can not only effectively transfer oil to the skin to achieve skin care effect, but also prevent liquid from quickly and effectively entering the middle layer for absorbing body fluids and prevent body fluids from flowing out from the sides.

[0005] A liquid absorbing surface layer, comprising a PE-PET hot air nonwoven fabric base layer, wherein the fiber diameter of the PE-PET hot air nonwoven fabric base layer is 2 to 2.5 deniers; the upper surface of the PE-PET hot air nonwoven fabric base layer is a skin-friendly surface, and an oil agent is coated on the skin-friendly surface in a strip shape along the length direction CD of the PE-PET hot air nonwoven fabric base layer, wherein the oil agent is a waxy substance at 25°C, and the contact angle is 109° to 116°, and the width of each strip of the oil agent is A millimeters, and a gap of B millimeters is provided between two adjacent strips of the oil agent, and the A <B。

[0006] Furthermore, the PE-PET hot air non-woven fabric base layer is made of a bicomponent fiber with a weight of 22-25 g / m2 and a PE-PET mass percentage of 50%-50%.

[0007] Furthermore, the oil is composed of the following materials: 60%-65% of cetearyl alcohol, 17-20% of shea butter, 15% of caprylic capric triglyceride, and 3-5% of polyglycerol-2 dipolyhydroxystearate.

[0008] Furthermore, the A is 2-3, and the B is 15-20.

[0009] Furthermore, the number of oil agents on the PE-PET hot air non-woven fabric base layer is 2-10.

[0010] A sanitary napkin comprises one of the above-mentioned liquid absorbing surface layers, a middle layer located on the lower surface of the liquid absorbing surface layer and a bottom layer located on the lower surface of the middle layer.

[0011] A method for preparing a sanitary napkin comprises the following steps:

[0012] A. Mix the following components to form an oil: 60%-65% of cetearyl alcohol, 17-20% of shea butter, 15% of caprylic capric triglyceride, and 3-5% of polyglyceryl-2 dipolyhydroxystearate;

[0013] B. Use PE-PET bicomponent fiber to form PE-PET hot air non-woven fabric base;

[0014] C. The oil in step A is heated to 75-80° C. to completely melt it into a fluid, and then placed in a coating tool, the coating tool is provided with a slit, and the skin-friendly surface of the PE-PET hot air non-woven fabric base layer in step B contacts and moves relative to the slit of the coating tool, so that the oil is coated on the skin-friendly surface of the PE-PET hot air non-woven fabric base layer in a strip shape;

[0015] D. After the oil agent cools and solidifies into a waxy state on the skin-friendly surface, the PE-PET hot air non-woven fabric base layer is compounded with the middle layer and bottom layer of the sanitary napkin to form a sanitary napkin.

[0016] Furthermore, step A2 is also included between steps A and B: taking 1 g of the oil agent and placing it on a glass slide, placing it horizontally in an oven at 80 degrees Celsius and heating it for 30 minutes, until the oil agent is completely melted and spontaneously flows evenly on the slide, turning off the heating function of the oven, allowing the oil agent to condense into a waxy solid, and using a contact angle tester to test and record the contact angle value within 0.5 seconds of the contact between the deionized water droplet and the waxy oil agent, measuring 3 times, taking the average value, and confirming that the contact angle value is within the range of 109° to 116°.

[0017] The technical solution of the present invention has the following technical effects:

[0018] A PE-PET hot air non-woven fabric base layer with a diameter of 2 to 2.5 deniers is used, and a strip-shaped oil agent with a waxy state and a contact angle of 109 to 116° is coated on the skin-friendly surface under 25°C. Since the oil agent is waxy at room temperature, its performance is more stable, and within the shelf life, it can be ensured that the oil agent is stably set on the skin-friendly surface before the user uses it. During use, the liquid falling on the surface layer quickly falls into the PE-PET hot air non-woven fabric base layer and is absorbed by the lower material, keeping the skin-friendly surface and the oil agent surface dry, and at the same time ensuring that the oil agent can effectively transfer the oil agent components to the skin when it contacts the skin. After testing, the sanitary napkin prepared by the liquid absorption surface layer of the present invention drips 10ml of sheep blood at an inclined angle of 45°, the amount of sheep blood that slides off is 0g, and the amount of skin migration of the oil agent is more than 18mg. When the contact angle is less than 109°, the amount of skin migration of the oil agent will decrease, affecting the skin care effect. When the contact angle is greater than 116°, the blood absorption time will be increased, making the skin-friendly surface not dry enough, and the performance is better than the existing products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the liquid absorption surface layer structure of Example 1 of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of a sanitary napkin according to Embodiment 1 of the present invention.

[0021] Figure 3 Schematic diagram of a CD run-off test tool according to an embodiment of the present invention.

[0022] Liquid absorption surface layer 1, PE-PET hot air non-woven fabric base layer 12, skin-friendly surface 11, middle layer 2, bottom layer 3, horizontal table top 4, sanitary napkin 5, separating funnel 6, and slope 7. DETAILED DESCRIPTION

[0023] Embodiment 1:

[0024] A method for preparing a sanitary napkin comprises the following steps:

[0025] A. Mix the following components to form an oil: 60% of cetearyl alcohol, 20% of shea butter, 15% of caprylic capric triglyceride, and 5% of polyglyceryl-2 dipolyhydroxystearate;

[0026] A2. Take 1g of the oil and place it on a glass slide. Place it horizontally in an oven at 80 degrees Celsius and heat it for 30 minutes. When the oil is completely melted and flows evenly on the slide, turn off the oven heating function to allow the oil to condense into a waxy solid. Use a contact angle tester to test and record the contact angle value within 0.5s of the contact between the deionized water droplet and the waxy oil. Measure 3 times and take the average value. The contact angle of the oil is 109°, which is within the range of 109° to 116°.

[0027] B. PE and PET are formed into a two-component fiber with a diameter of 2 denier in a ratio of 50% and 50%, forming a PE-PET hot air non-woven fabric base layer, and the PE-PET hot air non-woven fabric base layer is 22-25 g / m2;

[0028] C. The oil is applied online, that is, on the surface material on the sanitary napkin production line. Specifically, the oil is placed in a storage tank with heating and pumping capabilities, such as a clean hot melt adhesive machine. The oil is heated to 75-85 degrees Celsius to completely melt it into a fluid, and then pumped to the coating slit. The slit is in contact with the skin-friendly surface of the surface non-woven fabric, and there is relative movement between the non-woven fabric and the slit, so that the oil is coated in strips on the non-woven fabric. It can be understood that the heating tool is not limited to a hot melt machine, as long as it can effectively heat the oil to a predetermined temperature.

[0029] D. After the oil agent is cooled and solidified into a waxy state on the skin-friendly surface, the PE-PET hot air non-woven fabric base layer is compounded with the middle layer and bottom layer of the sanitary napkin to form a sanitary napkin.

[0030] Through the above steps AC, the liquid absorption surface layer 1 of the present embodiment can be formed, which includes a PE-PET hot air non-woven fabric base layer 12. The PE-PET hot air non-woven fabric base layer is made of 22 grams / square meter PE-PET 50%-50% two-component fiber. The fiber diameter of the PE-PET hot air non-woven fabric base layer is 2 deniers. The upper surface of the PE-PET hot air non-woven fabric base layer is a skin-friendly surface 11. The length direction of the PE-PET hot air non-woven fabric base layer is CD, and the width direction is MD.

[0031] The oil is coated on the skin-friendly surface in strips along the length direction CD. The oil is a waxy substance at 25°C, with a contact angle of 109. The width of each strip is 2 mm, and a 15 mm gap 13 is provided between two adjacent strips. Generally speaking, the number of strips is 2-10, and the width and gap of the oil can be adjusted according to actual conditions. The width of the oil is 2-3 mm, and the gap width is 15-20 mm. The oil is composed of the following materials: 60% cetearyl alcohol, 20% shea butter, 15% caprylic capric triglyceride, and 5% polyglyceryl-2 dipolyhydroxystearate.

[0032] A sanitary napkin can be formed by steps AD, which comprises a liquid absorbing surface layer 1, a middle layer 2 located below the liquid absorbing surface layer, and a bottom layer 3 located below the middle layer.

[0033] Embodiment 2:

[0034] A method for preparing a sanitary napkin comprises the following steps:

[0035] A. Mix the following components to form an oil: 65% of cetearyl alcohol, 17% of shea butter, 15% of caprylic capric triglyceride, and 3% of polyglyceryl-2 dipolyhydroxystearate;

[0036] A2. Take 1g of the oil and place it on a glass slide. Place it horizontally in an oven at 80 degrees Celsius and heat it for 30 minutes. When the oil is completely melted and flows evenly on the slide, turn off the oven heating function to allow the oil to condense into a waxy solid. Use a contact angle tester to test and record the contact angle value within 0.5s of the contact between the deionized water droplet and the waxy oil. Measure 3 times and take the average value. The contact angle of the oil is 116°, which is within the range of 109° to 116°.

[0037] B. PE and PET are formed into a bicomponent fiber with a diameter of 2 denier in a ratio of 50% and 50%, forming a PE-PET hot air non-woven fabric base layer, and the PE-PET hot air non-woven fabric base layer is 22 grams / square meter;

[0038] C. The oil is applied online, that is, on the surface material on the sanitary napkin production line. Specifically, the oil is placed in a storage tank with heating and pumping capabilities, such as a clean hot melt adhesive machine. The oil is heated to 75-85 degrees Celsius to completely melt it into a fluid, and then pumped to the coating slit. The slit is in contact with the skin-friendly surface of the surface non-woven fabric, and there is relative movement between the non-woven fabric and the slit, so that the oil is coated in strips on the non-woven fabric. It can be understood that the heating tool is not limited to a hot melt machine, as long as it can effectively heat the oil to a predetermined temperature.

[0039] D. After the oil agent is cooled and solidified into a waxy state on the skin-friendly surface, the PE-PET hot air non-woven fabric base layer is compounded with the middle layer and bottom layer of the sanitary napkin to form a sanitary napkin.

[0040] Embodiment three:

[0041] A method for preparing a sanitary napkin comprises the following steps:

[0042] A. Mix the following components to form an oil: 60% of cetearyl alcohol, 20% of shea butter, 15% of caprylic capric triglyceride, and 5% of polyglyceryl-2 dipolyhydroxystearate;

[0043] A2. Take 1g of the oil and place it on a glass slide. Place it horizontally in an oven at 80 degrees Celsius and heat it for 30 minutes. When the oil is completely melted and flows evenly on the slide, turn off the oven heating function to allow the oil to condense into a waxy solid. Use a contact angle tester to test and record the contact angle value within 0.5s of the contact between the deionized water droplet and the waxy oil. Measure 3 times and take the average value. The contact angle of the oil is 109°, which is within the range of 109° to 116°.

[0044] B. PE and PET are formed into a bicomponent fiber with a diameter of 2.5 denier in a ratio of 50% and 50% to form a PE-PET hot air non-woven fabric base layer, and the PE-PET hot air non-woven fabric base layer is 22 grams / square meter;

[0045] C. The oil is applied online, that is, on the surface material on the sanitary napkin production line. Specifically, the oil is placed in a storage tank with heating and pumping capabilities, such as a clean hot melt adhesive machine. The oil is heated to 75-85 degrees Celsius to completely melt it into a fluid, and then pumped to the coating slit. The slit is in contact with the skin-friendly surface of the surface non-woven fabric, and there is relative movement between the non-woven fabric and the slit, so that the oil is coated in strips on the non-woven fabric. It can be understood that the heating tool is not limited to a hot melt machine, as long as it can effectively heat the oil to a predetermined temperature.

[0046] D. After the oil agent is cooled and solidified into a waxy state on the skin-friendly surface, the PE-PET hot air non-woven fabric base layer is compounded with the middle layer and bottom layer of the sanitary napkin to form a sanitary napkin.

[0047] Embodiment 4:

[0048] A method for preparing a sanitary napkin comprises the following steps:

[0049] A. Mix the following components to form an oil: 60% of cetearyl alcohol, 20% of shea butter, 15% of caprylic capric triglyceride, and 5% of polyglyceryl-2 dipolyhydroxystearate;

[0050] A2. Take 1g of the oil and place it on a glass slide. Place it horizontally in an oven at 80 degrees Celsius and heat it for 30 minutes. When the oil is completely melted and flows evenly on the slide, turn off the oven heating function to allow the oil to condense into a waxy solid. Use a contact angle tester to test and record the contact angle value within 0.5s of the contact between the deionized water droplet and the waxy oil. Measure 3 times and take the average value. The contact angle of the oil is 109°, which is within the range of 109° to 116°.

[0051] B. PE and PET are formed into a bicomponent fiber with a diameter of 2 denier in a ratio of 50% and 50%, forming a PE-PET hot air non-woven fabric base layer, and the PE-PET hot air non-woven fabric base layer is 25 grams / square meter;

[0052] C. The oil is applied online, that is, on the surface material on the sanitary napkin production line. Specifically, the oil is placed in a storage tank with heating and pumping capabilities, such as a clean hot melt adhesive machine. The oil is heated to 75-85 degrees Celsius to completely melt it into a fluid, and then pumped to the coating slit. The slit is in contact with the skin-friendly surface of the surface non-woven fabric, and there is relative movement between the non-woven fabric and the slit, so that the oil is coated in strips on the non-woven fabric. It can be understood that the heating tool is not limited to a hot melt machine, as long as it can effectively heat the oil to a predetermined temperature.

[0053] D. After the oil agent cools and solidifies into a waxy state on the skin-friendly surface, the PE-PET hot air non-woven fabric base layer is compounded with the middle layer and bottom layer of the sanitary napkin to form a sanitary napkin.

[0054] Embodiment five:

[0055] A method for preparing a sanitary napkin comprises the following steps:

[0056] A. Mix the following components to form an oil: 62.5% of cetearyl alcohol, 18.5% of shea butter, 15% of caprylic capric triglyceride, and 4% of polyglyceryl-2 dipolyhydroxystearate;

[0057] A2. Take 1g of the oil and place it on a glass slide. Place it horizontally in an oven at 80 degrees Celsius and heat it for 30 minutes. When the oil is completely melted and flows evenly on the slide, turn off the oven heating function to allow the oil to condense into a waxy solid. Use a contact angle tester to test and record the contact angle value within 0.5s of the contact between the deionized water droplet and the waxy oil. Measure 3 times and take the average value. The contact angle of the oil is 113°, which is within the range of 109° to 116°.

[0058] B. PE and PET are formed into a bicomponent fiber with a diameter of 2.3 denier in a ratio of 50% and 50% to form a PE-PET hot air non-woven fabric base layer, and the PE-PET hot air non-woven fabric base layer is 23 grams / square meter;

[0059] C. The oil is applied online, that is, on the surface material on the sanitary napkin production line. Specifically, the oil is placed in a storage tank with heating and pumping capabilities, such as a clean hot melt adhesive machine. The oil is heated to 75-85 degrees Celsius to completely melt it into a fluid, and then pumped to the coating slit. The slit is in contact with the skin-friendly surface of the surface non-woven fabric, and there is relative movement between the non-woven fabric and the slit, so that the oil is coated in strips on the non-woven fabric. It can be understood that the heating tool is not limited to a hot melt machine, as long as it can effectively heat the oil to a predetermined temperature.

[0060] D. After the oil agent is cooled and solidified into a waxy state on the skin-friendly surface, the PE-PET hot air non-woven fabric base layer is compounded with the middle layer and bottom layer of the sanitary napkin to form a sanitary napkin.

[0061] The liquid absorption surface layer and sanitary napkin produced by the methods of Examples 2 to 5 are different from those produced in Example 1 in that the oil formulation ratio and oil contact angle of the liquid absorption surface layer are different; the fiber diameter and gram weight of the PE-PET hot air non-woven fabric base layer of the liquid absorption surface layer are different.

[0062] The experimental data comparison table of Examples 1 to 5 and Comparative Example is shown below. CD run-off test method

[0063] like Figure 3 As shown, a 45-degree slope 7 is prepared and placed on a horizontal table 4. A sanitary napkin 5 is fixed on the slope of the slope so that the width MD direction of the sanitary napkin is parallel to the table and the length CD direction is at an angle of 45 degrees to the table.

[0064] A separatory funnel 6 is fixed above the sanitary napkin, and the liquid outlet of the separatory funnel is 2 cm above the center of the sanitary napkin. 10 ml of sheep blood is contained in the separatory funnel.

[0065] Open the drain valve of the separatory funnel to allow the sheep's blood to be injected onto the surface of the sanitary napkin. Collect the sheep's blood that has fallen and not been absorbed on the lower side of the sanitary napkin in the CD direction.

[0066]

[0067]

[0068] According to the experiment, a PE-PET hot air non-woven fabric base with a diameter of 2 to 2.5 deniers is used, and a strip oil agent with a waxy state and a contact angle of 109 to 116° is coated on the skin-friendly surface under 25°C. Since the oil agent is waxy at room temperature, its performance is more stable. During the shelf life, it can be ensured that the oil agent is stably set on the skin-friendly surface before the user uses it. During use, the liquid falling on the surface layer quickly falls into the PE-PET hot air non-woven fabric base layer and is absorbed by the lower material, keeping the skin-friendly surface and the oil agent surface dry, and at the same time ensuring that the oil agent can effectively transfer the oil agent components to the skin when it contacts the skin. After testing, the sanitary napkin prepared by the liquid absorption surface layer of the present invention, 10ml of sheep blood is dripped at an inclined angle of 45°, the amount of sheep blood that slides off is 0g, and the amount of skin migration of the oil agent is more than 18mg. When the contact angle is less than 109°, the amount of skin migration of the oil agent will decrease, affecting the skin care effect. When the contact angle is greater than 116°, the blood absorption time will be increased, making the skin-friendly surface not dry enough.

Claims

1. A liquid absorbing surface layer, characterized in that: The invention comprises a PE-PET hot air nonwoven fabric base layer, wherein the fiber diameter of the PE-PET hot air nonwoven fabric base layer is 2 to 2.5 deniers; the upper surface of the PE-PET hot air nonwoven fabric base layer is a skin-friendly surface, and an oil agent is coated on the skin-friendly surface in a strip shape along the length direction CD of the PE-PET hot air nonwoven fabric base layer, wherein the oil agent is a waxy substance at 25°C, and the contact angle is 109° to 116°, and the width of each strip of the oil agent is A mm, and a gap of B mm is provided between two adjacent strips of the oil agent, and the A <B。 2. The liquid absorbing surface layer according to claim 1, characterized in that: The PE-PET hot air non-woven fabric base layer is made of bicomponent fiber with a weight of 22-25 g / m2 and a PE-PET mass percentage of 50%-50%.

3. The liquid absorbing surface layer according to claim 1, characterized in that: The oil is composed of the following materials: 60%-65% of cetearyl alcohol, 17%-20% of shea butter, 15% of caprylic and capric triglyceride, and 3%-5% of polyglycerol-2 dipolyhydroxystearate.

4. The liquid absorbing surface layer according to claim 1, characterized in that: The A is 2-3, and the B is 15-20.

5. The liquid absorbing surface layer according to claim 1, characterized in that: The PE-PET hot air non-woven fabric base layer has 2 to 10 oil agents.

6. A sanitary napkin, characterized in that: The invention comprises the liquid absorbing surface layer according to any one of claims 1 to 5, a middle layer located on the lower surface of the liquid absorbing surface layer and a bottom layer located on the lower surface of the middle layer.

7. A method for preparing a sanitary napkin, characterized in that: The following steps are involved: A. Mix the following components to form an oil: 60%-65% of cetearyl alcohol, 17-20% of shea butter, 15% of caprylic capric triglyceride, and 3-5% of polyglyceryl-2 dipolyhydroxystearate; B. Use PE-PET bicomponent fiber to form PE-PET hot air non-woven fabric base; C. The oil in step A is heated to 75-80° C. to completely melt it into a fluid, and then placed in a coating tool, the coating tool is provided with a slit, and the skin-friendly surface of the PE-PET hot air non-woven fabric base layer in step B contacts and moves relative to the slit of the coating tool, so that the oil is coated on the skin-friendly surface of the PE-PET hot air non-woven fabric base layer in a strip shape; D. After the oil agent is cooled and solidified into a waxy state on the skin-friendly surface, the PE-PET hot air non-woven fabric base layer is compounded with the middle layer and bottom layer of the sanitary napkin to form a sanitary napkin.

8. The method for preparing a sanitary napkin according to claim 7, characterized in that: The step A2 is also included between steps A and B: taking 1 g of the oil agent and placing it on a glass slide, placing it horizontally in an oven at 80 degrees Celsius and heating it for 30 minutes, until the oil agent is completely melted and spontaneously flows evenly on the slide, turning off the heating function of the oven, allowing the oil agent to condense into a waxy solid, and using a contact angle tester to test and record the contact angle value within 0.5 seconds of the contact between the deionized water droplet and the waxy oil agent, measuring 3 times, taking the average value, and confirming that the contact angle value is within the range of 109° to 116°.

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