Double-layer sandwich medical dressing and preparation method thereof

Abstract

A double-layer sandwich medical dressing includes a contact layer, an absorbent layer, and an isolation layer, attached sequentially from the inside out. The contact and isolation layers are connected by a side tissue. The contact layer is made of a seaweed fiber / polyester blended yarn, the absorbent layer is a non-woven absorbent cotton fabric, and the isolation layer is made of a Cool Plus / absorbent cotton blended yarn. During preparation, the contact and isolation layers are first designated as the inner and outer layers, and then the inner and outer layers, as well as the side tissue between the two layers, are woven simultaneously. Once the inner and outer layers are formed, a space is created between the two layers. Subsequently, the absorbent layer is inserted into the space while the dressing is woven until all the absorbent layers are inserted into the space. This design not only has unidirectional moisture conduction properties to quickly direct wound exudate to the outside world, but also has a certain ability to keep the wound moist. It is highly breathable and effectively blocks external contamination, preventing secondary damage to the wound. It has high mechanical strength and is particularly suitable for scenarios with high wound exudate.

Description

Technical Field

[0001] The invention relates to a medical dressing, belongs to the field of textile dressings, and in particular to a double-layer sandwich medical dressing and a preparation method thereof. Background Art

[0002] Traditional medical dressings mainly include gauze dressings and non-woven dressings. Among them, gauze dressings not only have poor exudate absorption performance, resulting in wound exudate being difficult to be absorbed, which increases the frequency of dressing changes, but also have poor moisturizing properties and are easy to dry out, which is not conducive to wound recovery. It also makes the gauze and wound fit poorly, causing friction and irritation to the skin around the wound, increasing the patient's discomfort. In addition, the microbial barrier effect of gauze is limited and is not enough to prevent external microorganisms from invading the wound.

[0003] In contrast, while traditional nonwoven dressings have a certain degree of moisture absorption, their quick-drying properties are poor. This means that when handling large amounts of exudate, exudate can easily accumulate on the dressing surface. This not only soaks the skin around the wound, increasing the risk of recurrent wound infection, but also obstructs air circulation and impairs breathability. Furthermore, the lack of sufficient permeability and deformability of nonwoven dressings can also lead to poor adhesion between the dressing and the skin around the wound, increasing patient discomfort.

[0004] The information disclosed in this background technology section is only intended to increase understanding of the overall background of the application and should not be considered as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects and problems of the prior art, such as poor moisture conduction performance, inability to absorb moisture and retain moisture, and low air permeability, and to provide a double-layer sandwich medical dressing with better moisture conduction performance, which can absorb moisture and retain moisture, and has strong air permeability, and a preparation method thereof.

[0006] To achieve the above objectives, the technical solution of the present invention is: a double-layer sandwich medical dressing, comprising a contact layer, an absorbent layer, and an isolation layer attached in sequence from the inside to the outside, with the two sides of the contact layer connected to the two sides of the isolation layer by edge tissue;

[0007] The contact layer is woven with seaweed fiber / polyester blended yarn as the inner warp and inner weft, the absorption layer is a non-woven fabric made of absorbent cotton, and the isolation layer is woven with Cool Plus / absorbent cotton blended yarn as the outer warp and outer weft. The absorption layer is sandwiched between the contact layer and the isolation layer, and the moisture absorption capacity of the absorption layer is greater than that of the contact layer and the isolation layer;

[0008] The double-layer sandwich medical dressing has a one-way transmission index greater than or equal to level 5, a liquid water dynamic transmission comprehensive index greater than or equal to level 5, and an air permeability of 2200-2400 mm / s. Preferably, the double-layer sandwich medical dressing has a one-way transmission index greater than 380 and a liquid water dynamic transmission comprehensive index greater than 0.9.

[0009] The moisture absorption capacity of the absorption layer is greater than that of the contact layer and the isolation layer, which means that within 12 hours after liquid is dripped onto the contact layer, the moisture content of the absorption layer is 35-55 times that of the contact layer, and the moisture content of the absorption layer is 20-35 times that of the isolation layer.

[0010] The liquid water diffusion speed of the isolation layer is greater than or equal to level 4.

[0011] The liquid diffusion distances of the contact layer and the isolation layer in the double-layer sandwich medical dressing in the warp and weft directions are both less than 1.5 cm, under the condition that a liquid with a volume of 1.5 ml is dripped onto the contact layer and the diffusion time is 30 s.

[0012] The seaweed fiber / polyester blended yarn is formed by blending seaweed fiber and polyester fiber, wherein the mass ratio of the seaweed fiber to the polyester fiber is 30%-40%:60%-70%.

[0013] The breaking strength of the medical dressing in the warp direction is 310-340N, and the breaking elongation is 12%-14%. The breaking strength of the medical dressing in the weft direction is 320-340N, and the breaking elongation is 12%-14%.

[0014] The pH value of the medical dressing contact layer is 6.52-6.84.

[0015] The contact layer and the isolation layer both use plain weave as the basic structure, with the warp arrangement ratio of the surface and the backing being 1:1, and the weft arrangement ratio of the surface and the backing being 1:1. The warp density of each layer is 120 strands / 100 cm, and the weft density is 120 strands / 100 cm.

[0016] The double-layer sandwich medical dressing has a thickness of 2.8-3.2 mm and a weight per square meter of 200-220 g / square meter.

[0017] A method for preparing the above-mentioned double-layer sandwich medical dressing, the preparation method comprising the following steps:

[0018] First, the contact layer is set as the inner layer and the isolation layer is set as the outer layer. Then, the inner layer, the outer layer, and the edge weave between the two layers are woven simultaneously. The edge weave is located on the left and right sides of the inner layer and the outer layer. Once the inner layer and the outer layer are formed, there will be a space between the two layers. Then, while weaving, the absorbent layer is stuffed into the space from front to back until all the absorbent layers are stuffed into the space. At this point, the absorbent layer is wrapped in the inner layer and the outer layer, and the method ends.

[0019] The simultaneous weaving of the inner layer, the outer layer, and the side weft between the two layers means that the outer layer includes a plurality of outer warp yarns and outer weft yarns, the inner layer includes a plurality of inner warp yarns and inner weft yarns, and the side weft includes a plurality of side warp yarns and side weft yarns, and the side weft yarns are replaced by the outer weft yarns or the inner weft yarns in turn. The specific weaving steps are as follows:

[0020] Weave the surface layer; lift the surface warp yarn 1, side warp yarn 1, and side warp yarn 4; sink the surface warp yarn 2, inner warp yarn I, inner warp yarn II, side warp yarn 2, and side warp yarn 3 to the bottom; insert the surface weft yarn 1;

[0021] Weave the inner layer; lift up the outer warp yarn 1, outer warp yarn 2, inner warp yarn I, side warp yarn 1, and side warp yarn 3; sink the inner warp yarn II, side warp yarn 2, and side warp yarn 4 to the bottom; insert the inner weft yarn I;

[0022] Weave the surface layer; lift the surface warp yarn 2, side warp yarn 2, and side warp yarn 3; sink the surface warp yarn 1, inner warp yarn I, inner warp yarn II, side warp yarn 1, and side warp yarn 4 to the bottom, and put in the surface weft yarn 2;

[0023] Weave the inner layer; lift the outer warp yarn 1, outer warp yarn 2, inner warp yarn II, side warp yarn 2, and side warp yarn 4; sink the inner warp yarn I, side warp yarn 1, and side warp yarn 3 to the bottom; insert the inner weft yarn II;

[0024] …

[0025] Repeat this process in sequence.

[0026] The loom diagram corresponding to the weaving of the inner layer, the surface layer, and the edge structure between the two layers includes a weave diagram, a drafting diagram, and a pattern plate diagram, which are respectively as follows:

[0027] Weave: The weave of both the surface and lining layers is plain weave, and the weave of the side layers is a 2 / 2 warp-weighted plain structure.

[0028] Drawing-in diagram: Use the sequential drawing-in method, inserting only one warp yarn into each heald frame, using a total of 8 heald frames; first insert edge warp yarn 1 into the 5th heald frame, and edge warp yarn 2 into the 6th heald frame; then insert the corresponding top warp yarn 1, inner warp yarn I, top warp yarn 2, and inner warp yarn II into the 1st, 2nd, 3rd, and 4th heald frames in sequence; then insert the corresponding edge warp yarn 3 and edge warp yarn 4 into the 7th and 8th heald frames in sequence;

[0029] Pattern card diagram: Determine the pattern card diagram based on the above-mentioned organization diagram and weft drawing.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention discloses a double-layer sandwich medical dressing and a method for preparing the same. The double-layer sandwich medical dressing comprises a contact layer, an absorbent layer, and an isolation layer, which are sequentially attached from the inside out. The contact layer is woven from a seaweed fiber / polyester blended yarn as the inner warp and inner weft. The absorbent layer is a nonwoven fabric made of absorbent cotton. The isolation layer is woven from a Cool Plus / absorbent cotton blended yarn as the outer warp and outer weft. The absorbent layer is sandwiched between the contact layer and the isolation layer, and the absorbent layer has a greater moisture absorption capacity than the contact layer and the isolation layer. When used, the medical dressing has the following advantages:

[0032] First point: Seaweed fiber has excellent hygroscopicity, biocompatibility and gel blocking effect. When it contacts the wound, the gel blocking effect of seaweed fiber can prevent the continuous seepage of exudate, reduce the generation of exudate, and partially curb the spread of blood. At the same time, the absorbent cotton non-woven fabric has a large specific surface area and a fluffy structure. Its pore structure can enhance its liquid absorption and retention capacity, especially in the absorption of liquid substances such as blood. It has higher absorption capacity and can absorb more exudate, preventing blood from accumulating around the wound, thereby forming a hygroscopic capacity between the contact layer and the absorption layer. Gradient difference, thereby continuously and unidirectionally directing the exudate from the contact layer into the absorbent layer. At this time, because the isolation layer located at the outermost layer has strong quick-drying properties, the isolation layer can continuously absorb and release the liquid exuded from the absorbent layer, allowing the exudate to evaporate quickly and effectively preventing liquid diffusion. Ultimately, the dressing as a whole can effectively control the liquid diffusion distance and have a unidirectional moisture conduction function, achieving a liquid diffusion distance of less than 1.5 cm in both the warp and weft directions of the contact layer, a unidirectional transmission index greater than or equal to level 5, and a liquid water dynamic transmission comprehensive index greater than or equal to level 5;

[0033] Second point: Based on the theory of wet healing, a moist environment is more conducive to wound healing, but too much moisture is not conducive to wound healing. Therefore, as the contact layer closest to the wound, it must maintain a certain humidity but not too wet. For this reason, this design adopts a blend of seaweed fiber and polyester. Among them, the moisture regain of seaweed fiber is relatively high, about 15.4%, and the water content is too high. Polyester fiber has the characteristics of dryness, high strength, and good wear resistance. Blending with seaweed fiber can not only reduce humidity to maintain a suitable moist environment, the moisture regain of the blended yarn is 3.2%, but also improve mechanical strength, wear resistance and dimensional stability. As a result, this dressing has excellent liquid absorption performance, can effectively absorb and conduct excess exudate from the wound, and can provide a suitable moist environment for the wound, achieving both moisture absorption and moisturizing. For example, within 24 hours after adding liquid to the contact layer, the contact layer still contains moisture;

[0034] Third point: The contact layer in this design is made of seaweed fiber / polyester blended yarn. Seaweed fiber is relatively soft and has a high degree of adhesion to the wound skin, which can improve the comfort of wound contact. At the same time, the length and fineness of seaweed fiber vary greatly, while the length and fineness of polyester fiber are more uniform. Therefore, after using polyester blending, the yarn evenness and yarn hairiness can be effectively improved. In addition, the gel blocking effect of seaweed fiber can promptly prevent the continuous seepage of exudate, reduce wound exudate and residue, and improve the adhesion of the dressing to the skin.

[0035] Therefore, the present invention not only has better moisture conduction performance and can absorb moisture and retain moisture, but also can effectively prevent the spread of exudate and has a high degree of fit with the skin around the wound.

[0036] 2. In a double-layer sandwich medical dressing and a preparation method thereof of the present invention, the absorption layer is a non-woven fabric made of absorbent cotton. Compared with traditional gauze, the pores between fibers in the non-woven fabric are smaller, which has a good isolation effect and can provide strong shielding for microorganisms. However, the small pores will damage the air permeability of the dressing, which is not conducive to the discharge of adverse gases generated during wound healing, and slows down the healing speed of the wound. For this reason, this design focuses on improving the exhaust speed of the pores to improve the utilization rate of the pores, that is, through the isolation layer with strong moisture absorption and quick-drying ability, the liquid in the absorption layer (non-woven fabric) is discharged faster, thereby increasing the flow rate of liquid and gas in the pores, and then promoting the overall air permeability. The overall air permeability reaches 2200-2400mm / s, turning disadvantages into advantages, thereby having good permeability and blocking the invasion of external microorganisms and other harmful substances. Furthermore, the moisture content of the isolation layer fluctuates minimally, remaining within a range of 1.0% to 2.8% for 18 hours after the liquid is added. This helps prevent external moisture and contaminants from entering the wound, enhancing the isolation effect. Therefore, the present invention not only offers enhanced air permeability but also provides a strong barrier to external contamination.

[0037] 3. In the double-layer sandwich medical dressing and its preparation method of the present invention, the seaweed fiber / polyester blended gauze in the contact layer not only produces gel blocking properties, effectively preventing liquid diffusion, thereby preventing the dressing from hardening and adhering to the skin, causing secondary skin damage during replacement, but also has better removability, which can also avoid secondary damage to the wound when the gauze is replaced. In addition, the dressing only appears light purple under ultraviolet light and contains very little fluorescent material, which has very weak irritation to the skin and will not cause adhesion to the wound surface. It is beneficial to protect the wound surface, will not damage the mucosa, and can avoid secondary damage when changing the dressing. Therefore, when changing the dressing, the present invention will not stick to the wound and damage the new tissue, will not cause secondary damage to the wound, and can ensure the integrity of the wound and the continuity of the healing process.

[0038] 4. In the double-layer sandwich medical dressing and its preparation method of the present invention, the pH value of the medical dressing is 6.52-6.84, which is weakly acidic and is conducive to wound healing. The reason is:

[0039] Basic cell processes and cycle activities, such as enzyme activity, macromolecular synthesis, metabolite transport, as well as inflammation, collagen formation, and angiogenesis, are all significantly affected by pH. In the early stages of wound healing, especially during hemostasis and inflammation, it is crucial to maintain an acidic environment in the wound. An acidic environment helps reduce the load on the skin surface, inhibits bacterial proliferation, and promotes the metabolism of adipose tissue, thereby accelerating wound healing. The pH value of normal skin is in the range of 4-6, which is acidic. However, after skin injury, the pH value of the wound surface rises to nearly 7.4, becoming alkaline, which is not conducive to wound healing. The pH value of the medical dressing is 6.52-6.84, which can lower the pH value and return it to a weakly acidic environment, which is conducive to healthy wound healing. Therefore, the pH value of the present invention is acidic, which is conducive to wound healing.

[0040] 5. In a double-layer sandwich medical dressing and its preparation method, the contact layer is made of a seaweed fiber / polyester blended yarn. Seaweed fiber produces gel-blocking properties after absorbing liquid and possesses certain antibacterial properties. It also has excellent moisture regain, both of which detract from the mechanical strength of the contact layer. Polyester fiber, on the other hand, offers high strength, good wear resistance, and a dry feel. When blended with seaweed fiber, polyester fiber enhances yarn strength, mechanical properties, and wear resistance, ensuring dimensional stability, improving yarn quality and reducing yarn production difficulty. This ultimately increases the mechanical strength of the dressing and reduces moisture regain in the contact layer. The double-layer sandwich medical dressing has a warp breaking strength of 310-340N and an elongation at break of 12%-14%. The weft breaking strength of the medical dressing is 320-340N and an elongation at break of 12%-14%. Therefore, the present invention exhibits superior mechanical strength.

[0041] 6. In the double-layer sandwich medical dressing and its preparation method of the present invention, during preparation, the contact layer is first set as the inner layer and the isolation layer as the surface layer, and then the inner layer, the surface layer, and the edge tissue between the two layers are woven at the same time. The edge tissue is located on the left and right sides of the surface layer and the left and right sides of the inner layer. Once the inner layer and the surface layer are formed, there will be a space between the two layers. Subsequently, while weaving, the absorbent layer is stuffed into the space from front to back. Each time the absorbent layer is stuffed, it will be immediately wrapped until all the absorbent layers are stuffed into the space. At this time, the absorbent layer is wrapped in the inner layer and the surface layer, and the method ends, thereby obtaining the final double-layer sandwich. The core medical dressing, when used in a specific application, is cut to an appropriate length as needed to adhere or bandage a wound (similar to wrapping tape). This preparation method not only smoothly adheres the contact layer, absorbent layer, and isolation layer layer by layer into a whole, making the operation process smooth, but also enhances the adhesion effect. That is, the inner and outer contact layers and isolation layers tightly wrap the absorbent layer, which facilitates the subsequent one-way moisture conduction effect and improves the one-way transmission index, so that wound exudate can be promptly conducted outward while the contact layer maintains a certain wettability. In addition, it can also improve the overall mechanical strength of the medical dressing, making it easier to bandage and less prone to damage. Therefore, the present invention is not only less difficult to operate, but also can improve the moisture conduction effect and mechanical strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention when viewed from above, and the uppermost layer is the isolation layer.

[0043] Figure 2 It is a cross-sectional schematic diagram of the present invention.

[0044] Figure 3 This is a diagram showing the settings of the surface layer and the inner layer in Example 1 of the present invention.

[0045] Figure 4 This is a schematic diagram of the textile process of the first surface layer in Example 1 of the present invention.

[0046] Figure 5 This is a schematic diagram of the weaving of the first inner layer in Example 1 of the present invention.

[0047] Figure 6 Schematic diagram of the weaving of the second surface layer in Example 1 of the present invention.

[0048] Figure 7 This is a schematic diagram of the weaving of the second inner layer in Example 1 of the present invention.

[0049] Figure 8 This is a schematic diagram of the operation when the absorbent layer is just inserted in Example 1 of the present invention.

[0050] Figure 9This is a schematic diagram of the operation when the absorbent layer has been inserted into Example 1 of the present invention.

[0051] Figure 10 It is a radial schematic diagram of the liquid diffusivity test in Example 1 of the present invention.

[0052] Figure 11 It is a latitudinal schematic diagram of the liquid diffusivity test performed in Example 1 of the present invention.

[0053] Figure 12 It is a schematic diagram of the machine diagram in Example 2 of the present invention. DETAILED DESCRIPTION

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] See also Figure 1 — Figure 12 A double-layer sandwich medical dressing, comprising a contact layer, an absorption layer, and an isolation layer attached in sequence from the inside to the outside, wherein two sides of the contact layer are connected to two sides of the isolation layer by edge tissue, and the edge connection is achieved by the edge tissue;

[0056] The contact layer is woven with seaweed fiber / polyester blended yarn as the inner warp and inner weft, the absorption layer is a non-woven fabric made of absorbent cotton, and the isolation layer is woven with Cool Plus / absorbent cotton blended yarn as the outer warp and outer weft. The absorption layer is sandwiched between the contact layer and the isolation layer, and the moisture absorption capacity of the absorption layer is greater than that of the contact layer and the isolation layer;

[0057] The double-layer sandwich medical dressing has a one-way transmission index greater than or equal to level 5, a liquid water dynamic transmission comprehensive index greater than or equal to level 5, and an air permeability of 2200-2400 mm / s. Preferably, the double-layer sandwich medical dressing has a one-way transmission index greater than 380 and a liquid water dynamic transmission comprehensive index greater than 0.9.

[0058] The moisture absorption capacity of the absorption layer is greater than that of the contact layer and the isolation layer, which means that within 12 hours after liquid is dripped onto the contact layer, the moisture content of the absorption layer is 35-55 times that of the contact layer, and the moisture content of the absorption layer is 20-35 times that of the isolation layer.

[0059] The liquid water diffusion speed of the isolation layer is greater than or equal to level 4.

[0060] The liquid diffusion distances of the contact layer and the isolation layer in the double-layer sandwich medical dressing in the warp and weft directions are both less than 1.5 cm, under the condition that a liquid with a volume of 1.5 ml is dripped onto the contact layer and the diffusion time is 30 s.

[0061] The seaweed fiber / polyester blended yarn is formed by blending seaweed fiber and polyester fiber, wherein the mass ratio of the seaweed fiber to the polyester fiber is 30%-40%:60%-70%.

[0062] The breaking strength of the medical dressing in the warp direction is 310-340N, and the breaking elongation is 12%-14%. The breaking strength of the medical dressing in the weft direction is 320-340N, and the breaking elongation is 12%-14%.

[0063] The pH value of the medical dressing contact layer is 6.52-6.84.

[0064] The contact layer and the isolation layer both use plain weave as the basic structure, with the warp arrangement ratio of the surface and the backing being 1:1, and the weft arrangement ratio of the surface and the backing being 1:1. The warp density of each layer is 120 strands / 100 cm, and the weft density is 120 strands / 100 cm.

[0065] The double-layer sandwich medical dressing has a thickness of 2.8-3.2 mm and a weight per square meter of 200-220 g / square meter.

[0066] A method for preparing the above-mentioned double-layer sandwich medical dressing, the preparation method comprising the following steps:

[0067] First, the contact layer is set as the inner layer and the isolation layer is set as the outer layer. Then, the inner layer, the outer layer, and the edge weave between the two layers are woven simultaneously. The edge weave is located on the left and right sides of the inner layer and the outer layer. Once the inner layer and the outer layer are formed, there will be a space between the two layers. Then, while weaving, the absorbent layer is stuffed into the space from front to back until all the absorbent layers are stuffed into the space. At this point, the absorbent layer is wrapped in the inner layer and the outer layer, and the method ends.

[0068] The simultaneous weaving of the inner layer, the outer layer, and the side weft between the two layers means that the outer layer includes a plurality of outer warp yarns and outer weft yarns, the inner layer includes a plurality of inner warp yarns and inner weft yarns, and the side weft includes a plurality of side warp yarns and side weft yarns, and the side weft yarns are replaced by the outer weft yarns or the inner weft yarns in turn. The specific weaving steps are as follows:

[0069] Weave the surface layer; lift the surface warp yarn 1, side warp yarn 1, and side warp yarn 4; sink the surface warp yarn 2, inner warp yarn I, inner warp yarn II, side warp yarn 2, and side warp yarn 3 to the bottom; insert the surface weft yarn 1;

[0070] Weave the inner layer; lift up the outer warp yarn 1, outer warp yarn 2, inner warp yarn I, side warp yarn 1, and side warp yarn 3; sink the inner warp yarn II, side warp yarn 2, and side warp yarn 4 to the bottom; insert the inner weft yarn I;

[0071] Weave the surface layer; lift the surface warp yarn 2, side warp yarn 2, and side warp yarn 3; sink the surface warp yarn 1, inner warp yarn I, inner warp yarn II, side warp yarn 1, and side warp yarn 4 to the bottom, and put in the surface weft yarn 2;

[0072] Weave the inner layer; lift the outer warp yarn 1, outer warp yarn 2, inner warp yarn II, side warp yarn 2, and side warp yarn 4; sink the inner warp yarn I, side warp yarn 1, and side warp yarn 3 to the bottom; insert the inner weft yarn II;

[0073] …

[0074] Repeat this process in sequence.

[0075] The loom diagram corresponding to the weaving of the inner layer, the surface layer, and the edge structure between the two layers includes a weave diagram, a drafting diagram, and a pattern plate diagram, which are respectively as follows:

[0076] Weave: The weave of both the surface and lining layers is plain weave, and the weave of the side layers is a 2 / 2 warp-weighted plain structure.

[0077] Drawing-in diagram: Use the sequential drawing-in method, inserting only one warp yarn into each heald frame, using a total of 8 heald frames; first insert edge warp yarn 1 into the 5th heald frame, and edge warp yarn 2 into the 6th heald frame; then insert the corresponding top warp yarn 1, inner warp yarn I, top warp yarn 2, and inner warp yarn II into the 1st, 2nd, 3rd, and 4th heald frames in sequence; then insert the corresponding edge warp yarn 3 and edge warp yarn 4 into the 7th and 8th heald frames in sequence;

[0078] Pattern card diagram: Determine the pattern card diagram based on the above-mentioned organization diagram and weft drawing.

[0079] The supplementary technical features of the present invention are as follows:

[0080] The mass ratio of seaweed fiber to polyester fiber in the seaweed fiber / polyester blended yarn of the present invention is preferably 30%-40%:60%-70%, and more preferably 35%:65%. The reason is that the yarn with a ratio of 35%:65% has good strength, hairiness, yarn uniformity and softness. It not only has a moderate moisture regain to ensure wettability, but also has good softness. At the same time, during the spinning process, the strength is greater and the yarn is less likely to break, which is conducive to improving the uniformity of the yarn.

[0081] The Cool Plus / absorbent cotton blended yarn of the present invention is preferably blended with 50% by weight of Cool Plus fiber and 50% by weight of absorbent cotton. The Cool Plus fiber has moisture absorption and quick-drying properties, and the addition of absorbent cotton enhances the moisture absorption of the gauze, thereby enabling the Cool Plus fiber / absorbent cotton blended gauze to promptly absorb excess liquid exuded from the wound and release moisture, thereby maintaining a dry-wet balance in the wound.

[0082] The present invention limits the dressing thickness to 2.8-3.2 mm and the weight per square meter to 200-220 g / m² because the dressing's surface density and thickness affect its liquid absorption performance, with thicker dressings generally having a greater absorption capacity. Similarly, surface density and thickness also affect the dressing's moisture and air permeability, with thinner dressings having greater air and moisture permeability. Furthermore, the liquid's penetration and diffusion properties are also affected by surface density and thickness, with thicker dressings hindering rapid liquid diffusion.

[0083] Example 1:

[0084] See also Figure 1 and Figure 2 A double-layer sandwich medical dressing, comprising a contact layer, an absorption layer, and an isolation layer attached in sequence from the inside to the outside, with the two sides of the contact layer connected to the two sides of the isolation layer by edge tissue, and the edge connection is achieved by the edge tissue; the contact layer is woven with seaweed fiber / polyester blended yarn as the inner warp and inner weft, the absorption layer is a non-woven fabric made of absorbent cotton, and the isolation layer is woven with Cool Plus / absorbent cotton blended yarn as the outer warp and outer weft. The absorption layer is sandwiched between the contact layer and the isolation layer, and the moisture absorption capacity of the absorption layer is greater than that of the contact layer and the isolation layer; the one-way transmission index of the double-layer sandwich medical dressing is greater than or equal to level 5, the liquid water dynamic transmission comprehensive index is greater than or equal to level 5, and the air permeability is 2200-2400mm / s.

[0085] A method for preparing the above-mentioned double-layer sandwich medical dressing, the preparation method comprising the following steps:

[0086] See also Figure 3 First, set the contact layer as the inner layer and the isolation layer as the surface layer, and then weave the inner layer, the surface layer, and the edge tissue between the two layers at the same time. The edge tissue is located on the left and right sides of the surface layer and the inner layer. Once the inner layer and the surface layer are formed, there will be a gap between the two layers. Then, while weaving, stuff the absorbent layer into the gap from front to back until all the absorbent layers are stuffed into the gap (such as Figure 8 、 Figure 9 As shown), at this time, the absorbent layer is wrapped in the inner layer and the surface layer, and the method ends;

[0087] The simultaneous weaving of the inner layer, the outer layer, and the side weft between the two layers means that the outer layer includes a plurality of outer warp yarns and outer weft yarns, the inner layer includes a plurality of inner warp yarns and inner weft yarns, and the side weft includes a plurality of side warp yarns and side weft yarns, and the side weft yarns are replaced by the outer weft yarns or the inner weft yarns in turn. The specific weaving steps are as follows:

[0088] See also Figure 4, weave the surface layer; lift the surface warp yarn 1, side warp yarn 1, and side warp yarn 4; sink the surface warp yarn 2, inner warp yarn Ⅰ, inner warp yarn Ⅱ, side warp yarn 2, and side warp yarn 3 to the bottom; insert the surface weft yarn 1;

[0089] See also Figure 5 , weave the inner layer; lift up the surface warp yarn 1, surface warp yarn 2, inner warp yarn I, side warp yarn 1, and side warp yarn 3; sink the inner warp yarn II, side warp yarn 2, and side warp yarn 4 to the bottom; put in the inner weft yarn I;

[0090] See also Figure 6 , weave the surface layer; lift the surface warp yarn 2, side warp yarn 2, and side warp yarn 3; sink the surface warp yarn 1, inner warp yarn Ⅰ, inner warp yarn Ⅱ, side warp yarn 1, and side warp yarn 4 to the bottom, and put in the surface weft yarn 2;

[0091] See also Figure 7 , weave the inner layer; lift the surface warp yarn 1, surface warp yarn 2, inner warp yarn II, side warp yarn 2, and side warp yarn 4; sink the inner warp yarn I, side warp yarn 1, and side warp yarn 3 to the bottom; insert the inner weft yarn II;

[0092] …

[0093] Repeat this process in sequence.

[0094] The following tests were performed on the double-layer sandwich medical dressing produced above:

[0095] (1) Tensile breaking strength test:

[0096] The test was conducted in accordance with the standard YY 0331-2006 "Performance Requirements and Test Methods for Absorbent Cotton Gauze and Absorbent Cotton Viscose Blended Gauze". 10 specimens were prepared, 5 of which were cut in the weft direction and the other 5 in the warp direction. When sampling, ensure that the distance from the edge of the fabric is at least 15 mm, and avoid any wrinkles or worn areas. The width of each specimen should be exactly 50 mm, and the length should be sufficient to be firmly clamped between two clamps 10 mm apart on the tensile testing machine. The specimens were placed in the clamping plates of the tensile machine in turn, and the tensile test was performed at a constant rate of 100 cm / min. The test results are as follows:

[0097] Table 1, Warp Strength Test

[0098]

[0099] Table 2, Weft strength test

[0100]

[0101] It can be seen from Tables 1 and 2 that the medical dressing has strong mechanical strength, which is much greater than the minimum breaking strength requirements specified in the YY0331-2006 standard, that is, the warp breaking force is greater than 70N and the weft breaking force is greater than 60N.

[0102] (2) Liquid diffusivity test:

[0103] According to the standard YY / T 0471.1-2004, "Test Methods for Contact Wound Dressings - Part 1: Liquid Absorption," simulated wound exudate was prepared: 8.298g of sodium chloride and 0.368g of calcium chloride dihydrate were dissolved in 1L of deionized water. To enhance the observability of the experiment, a small amount of red ink was added to the solution. Five 5cm*5cm medical dressings were prepared and placed in a culture dish. 1.5ml of simulated wound exudate was slowly dripped onto the test sample. After the liquid diffusion stabilized, the sample was allowed to stand for 30 seconds. The liquid diffusion performance of the sample was evaluated by measuring the maximum diffusion length of the liquid on the sample. The test results are as follows:

[0104] Depend on Figure 10 、 Figure 11 It can be seen that in the liquid diffusion test, the liquid diffusion of the medical dressing in the warp and weft directions is limited to 1.5 cm, and the effect is better.

[0105] (3) Air permeability test:

[0106] According to GB / T5453-1997 "Textiles: Determination of Air Permeability of Fabrics", 5 samples of medical dressing were cut out, each sample was 100cm2, and tested using the YG461E-III fully automatic air permeability meter. The test results are as follows:

[0107] Table 3. Air permeability test results of double-layer sandwich medical dressing

[0108]

[0109] As shown in Table 3, the average air permeability of the medical dressing is 2302.1 mm / s, which has good air permeability and can discharge the adverse gases generated during wound healing, ensuring a good environment for the wound, thereby facilitating the healing speed of the wound.

[0110] Example 2:

[0111] The basic content is the same as Example 1, except that:

[0112] See also Figure 12 The loom diagram corresponding to the weaving of the inner layer, the surface layer, and the edge structure between the two layers includes a weaving diagram, a drawing diagram, and a pattern plate diagram, which are respectively as follows:

[0113] Weave: The weave of both the surface and lining layers is plain weave, and the weave of the side layers is a 2 / 2 warp-weighted plain structure.

[0114] Drawing-in diagram: Use the sequential drawing-in method, inserting only one warp yarn into each heald frame, using a total of 8 heald frames; first insert edge warp yarn 1 into the 5th heald frame, and edge warp yarn 2 into the 6th heald frame; then insert the corresponding top warp yarn 1, inner warp yarn I, top warp yarn 2, and inner warp yarn II into the 1st, 2nd, 3rd, and 4th heald frames in sequence; then insert the corresponding edge warp yarn 3 and edge warp yarn 4 into the 7th and 8th heald frames in sequence;

[0115] Pattern card diagram: Determine the pattern card diagram based on the above-mentioned organization diagram and weft drawing.

[0116] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed in the present invention should be included in the protection scope recorded in the claims.

Claims

1. A double-layer sandwich medical dressing, characterized by: The double-layer sandwich medical dressing includes a contact layer, an absorption layer, and an isolation layer attached in sequence from the inside to the outside, and the two sides of the contact layer are connected to the two sides of the isolation layer through edge tissue; The contact layer is woven with seaweed fiber / polyester blended yarn as the inner warp and inner weft, the absorption layer is a non-woven fabric made of absorbent cotton, and the isolation layer is woven with Cool Plus / absorbent cotton blended yarn as the outer warp and outer weft. The absorption layer is sandwiched between the contact layer and the isolation layer, and the moisture absorption capacity of the absorption layer is greater than that of the contact layer and the isolation layer; The double-layer sandwich medical dressing has a one-way transmission index greater than or equal to level 5, a liquid water dynamic transmission comprehensive index greater than or equal to level 5, and an air permeability of 2200-2400 mm / s; The above-mentioned double-layer sandwich medical dressing is manufactured according to the following steps: First, the contact layer is set as the inner layer and the isolation layer is set as the outer layer. Then, the inner layer, the outer layer, and the edge weave between the two layers are woven simultaneously. The edge weave is located on the left and right sides of the inner layer and the outer layer. Once the inner layer and the outer layer are formed, there will be a space between the two layers. Then, while weaving, the absorbent layer is stuffed into the space from front to back until all the absorbent layers are stuffed into the space. At this point, the absorbent layer is wrapped in the inner layer and the outer layer, and the method ends. The simultaneous weaving of the inner layer, the outer layer, and the side weft between the two layers means that the outer layer includes a plurality of outer warp yarns and outer weft yarns, the inner layer includes a plurality of inner warp yarns and inner weft yarns, and the side weft includes a plurality of side warp yarns and side weft yarns, and the side weft yarns are replaced by the outer weft yarns or the inner weft yarns in turn. The specific weaving steps are as follows: Weave the surface layer; lift the surface warp yarn 1, side warp yarn 1, and side warp yarn 4; sink the surface warp yarn 2, inner warp yarn I, inner warp yarn II, side warp yarn 2, and side warp yarn 3 to the bottom; insert the surface weft yarn 1; Weave the inner layer; lift up the outer warp yarn 1, outer warp yarn 2, inner warp yarn I, side warp yarn 1, and side warp yarn 3; sink the inner warp yarn II, side warp yarn 2, and side warp yarn 4 to the bottom; insert the inner weft yarn I; Weave the surface layer; lift the surface warp yarn 2, side warp yarn 2, and side warp yarn 3; sink the surface warp yarn 1, inner warp yarn I, inner warp yarn II, side warp yarn 1, and side warp yarn 4 to the bottom, and put in the surface weft yarn 2; Weave the inner layer; lift the outer warp yarn 1, outer warp yarn 2, inner warp yarn II, side warp yarn 2, and side warp yarn 4; sink the inner warp yarn I, side warp yarn 1, and side warp yarn 3 to the bottom; insert the inner weft yarn II; Repeat this process in sequence.

2. The double-layer sandwich medical dressing according to claim 1, characterized in that: The moisture absorption capacity of the absorption layer is greater than that of the contact layer and the isolation layer, which means that within 12 hours after liquid is dripped onto the contact layer, the moisture content of the absorption layer is 35-55 times that of the contact layer, and the moisture content of the absorption layer is 20-35 times that of the isolation layer.

3. The double-layer sandwich medical dressing according to claim 1, characterized in that: The liquid water diffusion speed of the isolation layer is greater than or equal to level 4.

4. The double-layer sandwich medical dressing according to claim 1, characterized in that: The liquid diffusion distances of the contact layer and the isolation layer in the double-layer sandwich medical dressing in the warp and weft directions are both less than 1.5 cm, under the condition that a liquid with a volume of 1.5 ml is dripped onto the contact layer and the diffusion time is 30 s.

5. The double-layer sandwich medical dressing according to claim 1, characterized in that: The seaweed fiber / polyester blended yarn is formed by blending seaweed fiber and polyester fiber, wherein the mass ratio of seaweed fiber to polyester fiber is 30%-40%:60%-70%.

6. The double-layer sandwich medical dressing according to claim 1, characterized in that: The breaking strength of the medical dressing in the warp direction is 310-340N, and the elongation at break is 12%-14%. The breaking strength of the medical dressing in the weft direction is 320-340N, and the elongation at break is 12%-14%.

7. The double-layer sandwich medical dressing according to claim 1, characterized in that: The pH value of the medical dressing contact layer is 6.52-6.

84.

8. The double-layer sandwich medical dressing according to claim 1, characterized in that: The contact layer and the isolation layer both use plain weave as the basic structure, with the warp arrangement ratio of the surface and the backing being 1:1, and the weft arrangement ratio of the surface and the backing being 1:

1. The warp density of each layer is 120 strands / 100 cm, and the weft density is 120 strands / 100 cm. The double-layer sandwich medical dressing has a thickness of 2.8-3.2 mm and a weight per square meter of 200-220 g / square meter.

9. A method for preparing the double-layer sandwich medical dressing according to claim 1, characterized in that: The preparation method comprises the following steps: First, the contact layer is set as the inner layer and the isolation layer is set as the outer layer. Then, the inner layer, the outer layer, and the edge weave between the two layers are woven simultaneously. The edge weave is located on the left and right sides of the inner layer and the outer layer. Once the inner layer and the outer layer are formed, there will be a space between the two layers. Then, while weaving, the absorbent layer is stuffed into the space from front to back until all the absorbent layers are stuffed into the space. At this point, the absorbent layer is wrapped in the inner layer and the outer layer, and the method ends. The simultaneous weaving of the inner layer, the outer layer, and the side weft between the two layers means that the outer layer includes a plurality of outer warp yarns and outer weft yarns, the inner layer includes a plurality of inner warp yarns and inner weft yarns, and the side weft includes a plurality of side warp yarns and side weft yarns, and the side weft yarns are replaced by the outer weft yarns or the inner weft yarns in turn. The specific weaving steps are as follows: Weave the surface layer; lift the surface warp yarn 1, side warp yarn 1, and side warp yarn 4; sink the surface warp yarn 2, inner warp yarn I, inner warp yarn II, side warp yarn 2, and side warp yarn 3 to the bottom; insert the surface weft yarn 1; Weave the inner layer; lift up the outer warp yarn 1, outer warp yarn 2, inner warp yarn I, side warp yarn 1, and side warp yarn 3; sink the inner warp yarn II, side warp yarn 2, and side warp yarn 4 to the bottom; insert the inner weft yarn I; Weave the surface layer; lift the surface warp yarn 2, side warp yarn 2, and side warp yarn 3; sink the surface warp yarn 1, inner warp yarn I, inner warp yarn II, side warp yarn 1, and side warp yarn 4 to the bottom, and put in the surface weft yarn 2; Weave the inner layer; lift the outer warp yarn 1, outer warp yarn 2, inner warp yarn II, side warp yarn 2, and side warp yarn 4; sink the inner warp yarn I, side warp yarn 1, and side warp yarn 3 to the bottom; insert the inner weft yarn II; Repeat this process in sequence.

10. The method for preparing a double-layer sandwich medical dressing according to claim 9, characterized in that: The loom diagram corresponding to the weaving of the inner layer, the surface layer, and the edge structure between the two layers includes a weave diagram, a drafting diagram, and a pattern plate diagram, which are respectively as follows: Weave: The weave of both the surface and lining layers is plain weave, and the weave of the side layers is 2 / 2 warp weight plain structure; Drawing-in diagram: Use the sequential drawing-in method, inserting only one warp yarn into each heald frame, using a total of 8 heald frames; first insert edge warp yarn 1 into the 5th heald frame, and edge warp yarn 2 into the 6th heald frame; then insert the corresponding top warp yarn 1, inner warp yarn I, top warp yarn 2, and inner warp yarn II into the 1st, 2nd, 3rd, and 4th heald frames in sequence; then insert the corresponding edge warp yarn 3 and edge warp yarn 4 into the 7th and 8th heald frames in sequence; Pattern card diagram: Determine the pattern card diagram based on the above-mentioned organization diagram and weft drawing.

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