CN116725776A - A manufacturing process for array elastic waist pants type baby absorbent products using ultrasonic welding hot air non-woven fabrics - Google Patents

Abstract

The invention discloses a manufacturing process of an array elastic waistline trousers type infant absorbent product by using ultrasonic welding hot air non-woven fabrics, which comprises the following steps: a) Preparing a waistline basal layer; b) A combined elastomer; c) A composite PE film layer; d) Preparing a waistline surface layer; e) Compounding the waistline; f) Forming a waistline elastic space; g) Preparing an absorbent article body; h) Assembling the waistline unit to the absorbent article body. The ultrasonic connecting structure adopted in a large number is used as a main implementation form of assembling connection of the waistline, so that the consumption of viscose is reduced, the weight of the absorbent product is reduced, the portability is improved, and the whole structure has no obvious difference compared with the traditional elastic rubber waistline product in the use process on the premise of ensuring ventilation, portability and comfort of the waistline structure, so that the ultrasonic connecting structure is suitable for infant groups.

Description

An array elastic waist pants type baby absorbent using ultrasonic welding hot air non-woven fabric Product manufacturing process

Technical field

The present invention belongs to the technical field of absorbent product manufacturing process, and specifically relates to the manufacturing process of the elastic waist part. Furthermore, it relates to the manufacturing process of an array elastic waist pants type baby absorbent product using ultrasonic welding hot air non-woven fabric.

Background technique

Pants-type baby absorbent products can be regarded as the collective name of stretch pants and diapers. They are nursing products for the special group of infants and young children. They generally emphasize the close-fitting and comfortable performance. As for the products currently sold and developed on the market, most of them provide unique and effective solutions to the problem of easy excretion of this group. The main structures of various leak-proof, highly absorbent, and dry absorbent products are It provides a more comfortable wearing experience for infants and young children, and greatly reduces the tediousness of care work for caregivers.

In order to allow absorbent products to better fit the user and avoid leakage problems, as an important part of the fastening structure of absorbent products, the waistline is a relatively special existence. On the one hand, in order to improve stability, waistline products usually require It has better shrinkage performance, but the skin of infants and young children is relatively tender and easily damaged. An overly tight waistline can easily cause redness, swelling or even damage to the skin of infants and young children. On the other hand, the waistline structure needs to ensure breathability, so it is generally prepared with a breathable structure. The main body, however, simply breathable material may cause problems with liquid leaking from the waist.

In the existing technology, in response to the above situation, many manufacturers have exerted their subjective initiative and proposed a variety of breathable, soft, and close-fitting waist structures. For example, on the premise of increasing the contraction force, the contact area of the waist is increased, the pressure of the waist is reduced, and the pressure of the waist is increased. Softness, adding a breathable PE membrane structure to simultaneously improve breathability and waterproof performance, etc. For example, the existing bubble waist structure design is an example of organic integration of the above structures.

However, for products that fully consider the above properties, in order to ensure the stability of the waist structure, it is usually necessary to use elastic hot melt adhesive as a solution that takes into account both the elastomer and the adhesive body. In this way, the waist part will occupy a certain amount of adhesive space. The amount of glue used will increase the overall weight of the absorbent product as a whole. If the structure of ultrasonic adhesion is directly applied in large quantities, then the connection effect of simple ultrasonic connection for the above-mentioned waistline structure with more complex structure may reach Less than the normal level of elastic glue, resulting in insufficient structural stability of absorbent products, affecting the nursing effect of infants and young children. Therefore, it is necessary to optimize and upgrade the above-mentioned existing technologies to improve the portability of the waist structure while ensuring the original Some comfort.

Contents of the invention

In view of the technical defects existing in the background technology, the present invention proposes a manufacturing process for array elastic waist pants type baby absorbent products using ultrasonic welding hot air non-woven fabrics, which solves the above technical problems and meets actual needs. The specific technical solutions are as follows Show:

A manufacturing process for array elastic waist pants type baby absorbent products using ultrasonic welding hot air non-woven fabrics, consisting of the following steps:

A) Prepare the waistline base layer, and prepare a hot-air non-woven fabric on the gauze curtain with an array of raised points, so that the surface of the hot-air non-woven fabric is arranged with an array of several protruding connecting parts during curing and molding to form a waistline base layer;

B) Combine the elastomers, keep the waistline base layer prepared in step A in a flat state, and evenly connect several strips of elastomers whose shrinkage length is less than the length of the waistline base layer along the length direction of the waistline base layer;

C) Composite the PE film layer, keep the waistline base layer processed in step B in a flat state, cover the PE film layer on the waistline base layer, and then tightly compound the PE film layer on the protruding connection part through ultrasonic compounding;

D) Prepare the waistline surface layer, prepare another piece of non-woven fabric with an area at least 3 times that of the waistline base layer and a length no less than the waistline base layer as the waistline surface layer, and fold it along a parallel line not exceeding 1/3 of the width direction;

E) The waistline is compounded by itself. Keep the waistline base layer that has been compounded with the PE film layer in step C flattened and put it into the crease of the waistline surface layer that has been folded in step D. Fold the shorter edge of the waistline surface layer and the waistline. The base layer, PE film layer and the corresponding position on the longer side of the fold are closely combined in the form of ultrasonic compounding;

F) Waist elastic space forming, keep the waist base layer processed in step E flat, and combine several strip-shaped ultrasonic composite connections at equal intervals in the direction perpendicular to the direction of the strip-shaped elastic body, without overlapping the protruding connection parts. The belt divides the non-woven space between the strip elastic bodies into several elastic spaces to form a waistline monomer with a free skirt structure composed of the remaining longer side area of the fold;

G) Prepare the main body of the absorbent product, which will include at least the bottom layer, the core body, and the top layer and are closely compounded in sequence to form the main body of the absorbent product;

H) Assemble the waistline monomer to the main body of the absorbent article. Composite the skirt structure of the waistline monomer processed in step F together with the ultrasonic compounding position in step E with the end edge in the length direction of the main body of the absorbent article. Place the main body of the absorbent article along the length. After folding in half, connect the two ends of the waistline body in the length direction to complete the assembly of the absorbent product.

The beneficial effects of the present invention are that the ultrasonic connection structure widely used as the main implementation form of waistline assembly connection reduces the use of viscose, helps reduce the weight of absorbent products and improves portability, and is aimed at Due to the characteristics of ultrasonic connection, a non-woven fabric matching structure is used as an auxiliary method to strengthen the ultrasonic connection structure. On the premise of ensuring that the waist structure is breathable, light and comfortable, the overall structure is better than the existing elastic glue during use. There will be no significant difference in waist circumference products, so it is suitable for use by infants and young children.

Description of drawings

Figure 1 is a schematic diagram of the processing method from step A to step C of the manufacturing process of the present invention.

FIG. 2 is a schematic diagram of the post-processing state after steps A to E of the manufacturing process of the present invention.

FIG. 3 is a schematic diagram of the post-processing state after steps A to H of the manufacturing process of the present invention.

Figure 4 is a second schematic diagram of the post-processing state after steps A to H of the manufacturing process of the present invention.

Among them: gauze curtain 1, array protruding points 10, waist base layer 2, protruding connection part 20, strip elastomer 3, PE film layer 4, waist surface layer 5, skirt structure 50, ultrasonic composite connection belt 6, elastic space 7 , Waistline monomer A, absorbent product main body 8, bottom layer 80, core 81, top layer 82, flow guide layer 83, and side leakage prevention baffle 84.

Detailed ways

The embodiments of the present invention will be described below in conjunction with the accompanying drawings and relevant embodiments. The embodiments of the present invention are not limited to the following embodiments, and the present invention involves relevant necessary components in the technical field and should be regarded as within the technical field. Well-known technology is known and mastered by those skilled in the technical field.

Referring to Figures 1 to 4, a manufacturing process for array elastic waist pants type baby absorbent products using ultrasonic welding hot air non-woven fabrics consists of the following steps:

A) Prepare the waistline base layer 2, and prepare a hot-air non-woven fabric on the gauze curtain 1 with an array of protruding points 10, so that a number of protruding connecting parts 20 in an array are arranged on the surface of the hot-air non-woven fabric during curing and molding to form a waistline base layer. Bottom 2;

As shown in Figure 1, in this step, the hot air non-woven fabric structure as the base layer 2 of the waistline is the central core part of the elastic waistline component, which is the basis of the elastic cavity and elastic contraction force after the stroke. In order to allow the elastic cavity to be formed naturally, as the base of the elastic cavity, the waistline base layer 2 formed by the hot-air non-woven fabric is formed by a gauze curtain with an array of convex points 10 during the molding process. Specifically, several When the fine polymer fiber filaments are stacked on the gauze curtain, many parts will be lifted up by the array of convex points 10, and then when the hot air non-woven fabric is shaped, it will have several holes for subsequent connections in its natural state. Raised joints.

B) Combine the elastomers, keep the waistline base layer 2 prepared in step A in a flat state, and evenly connect several strip-shaped elastomers 3 whose shrinkage length is smaller than the length of the waistline base layer 2 along the length direction of the waistline base layer 2;

As shown in Figure 1, in this step, when compounding the strip elastomer 3, the strip elastomer 3 is preferably elastic yarn or a slightly thicker elastic thread. Specifically, if the elastic yarn material is selected, its diameter is less than 1mm. , then the elastic line can exceed 1mm. During the composite process, the strip elastic body 3 needs to remain in a stretched state to be composited with the waist base layer 2. In a further preferred case, between any four adjacent protruding connecting parts 20 In the rectangular area, the stretch ratio of the strip elastic body 3 decreases from the edge to the center. In this way, when it naturally shrinks into the elastic space 7, the above-mentioned setting characteristics of the strip elastic body 3 can improve the shaping effect of the elastic space 7. It is more natural and has better deformation recovery ability after being stressed, especially the edge of the elastic space 7. Because the tightened strip elastic body 3 forms folds surrounding the elastic space 7, the shape of the elastic space 7 is more stable and plays a more important role. Excellent elastic buffering effect.

C) Composite PE film layer 4, keep the waistline base layer 2 processed in step B in a flat state, cover the PE film layer 4 on the waistline base layer 2, and use ultrasonic compounding to attach the PE film layer 4 to the protrusions. The connecting part 20 is closely combined;

As shown in Figure 1, this step is a key step before forming the elastic space 7. Through this step, the PE film layer 7 can be wrapped in the inner cavity of the elastic space 7, and can follow the shrinkage of the strip elastic body 3. With the natural shaping of the elastic space 7, it will fit more closely to the inner wall of the elastic space 7, reducing the occupation of the free area of the inner cavity of the elastic space 7. In the subsequent leak-proof ventilation, it can effectively isolate moisture and reduce the close contact with moisture. contact and improve ventilation efficiency.

D) Prepare the waistline surface layer 5. Prepare another piece of non-woven fabric with an area at least 3 times that of the waistline base layer 2 and a length not less than the waistline base layer 2 as the waistline surface layer 5, and fold it along a parallel line not exceeding 1/3 of the width direction. ;

As shown in Figure 1 and Figure 2, in this step, the type of non-woven fabric used for the waist surface layer 5 can be selected according to the actual material type or technical characteristics of the manufacturer. Basically, it needs to meet the requirements of not being easy to break. When compounding, refer to the content described in the steps and fold the part no more than 1/3 of the width. The function of this part is to accommodate the waist base layer 2, so that after the waist surface layer 5 is folded and wrapped around the waist base layer 2, there is still excess length. Form the skirt structure 50 required later, and at the same time provide enough ultrasonic composite area for the shorter side hem, ensuring that when the subsequent process is completed, the assembled waistline monomer A has sufficient structural strength, and at the same time facilitates the waistline monomer A to target According to the development needs of the manufacturer, the skirt structure 50 can be selectively turned into a skirt, or further folded and compounded, and used as other storage or padding structures for absorbent products, which is very convenient and flexible.

Furthermore, under the wrapping effect of the waistline surface layer 5, on the one hand, it can reduce the tight force exerted by the elastic waistband on the user's skin when the absorbent product is worn, and on the other hand, it can provide the waistline base layer arranged on the inside with 2 provides good preliminary water absorption barrier and protection, making the elastic space 7 formed by the inner waist base layer 2 less susceptible to damage by external forces. The elastic space 7 thus obtains a good molding effect, and the waist base layer 2 and the waist surface layer 5 can further form a buffer space, which in turn can allow the overall stable structure to also act on the waist surface layer 5, making the waist single body not only structurally stable, but also providing a better buffering and leakage-blocking effect.

E) The waistline is compounded by itself. Keep the waistline base layer 2 that has been compounded with the PE film layer 4 in step C in a flat state and then put it into the crease of the waistline surface layer 5 that has been folded in step D. Make the folded part of the waistline surface layer 5 shorter. The side edges, the waist base layer 2, the PE film layer 4 and the corresponding positions on the longer side of the fold are closely compounded in the form of ultrasonic compounding;

As shown in Figure 1 and Figure 2, this step is an extension of the above-mentioned step D, the last step of wrapping and assembling the waistline monomer A. After the above steps are completed, the structural strength of the waistline monomer A itself can be guaranteed. Because it is in a flattened state, although the strip elastic body 3 still has the ability to elastically deform, it cannot shrink naturally. The process of steps B to E continues to remain flat. On the one hand, it contributes to the stability of the processing and allows each molding process to be smooth. The relative position between the protruding connecting parts 20 remains unchanged, so that the ultrasonic composite can use surface contact to adapt point contact, so that each protruding connecting part 20 becomes a necessary connection point of the elastic space 7, reducing the positioning of subsequent processing equipment. difficulty, and at the same time, the entire process can ensure the isotropic consistency of the fiber structure of the waist base layer 2 and the waist surface layer 5, so that the final product qualification rate of natural shrinkage can be improved.

F) Waist elastic space forming, keep the waist base layer 2 processed in step E flat, and combine several strips along the direction perpendicular to the direction of the strip elastic body 3 at equal intervals without overlapping with the protruding connection portion 20 The ultrasonic composite connecting belt 6 divides the non-woven space between the strip elastic bodies 3 into several elastic spaces 7 to form a waist monomer A with a free skirt structure 50 composed of the remaining longer side area of the fold. ;

As shown in FIGS. 1 to 3 , in this step, the tension exerted on the waist base layer 2 and the waist surface layer 5 is actually released, allowing them to shrink naturally, thereby allowing the elastic space 7 to be evenly connected by each protrusion 20 The formed ultrasonic dots and the ultrasonic composite connecting belt 6 provided on one side of the protruding connection part of each row are formed stably in the joint limit, and ensure the structural strength of the entire waistline monomer A to facilitate subsequent processing operations.

G) Prepare the absorbent product main body 8, which will include at least the bottom layer 80, the core 81, and the top layer 82 and be closely compounded in sequence to form the absorbent product main body 8;

Referring to Figure 3, in this step, the structure of the absorbent article main body 8 can be further expanded and extended on the basis of the above-mentioned basic components. The manufacturer can make adaptive settings according to needs, and the present invention does not limit this further.

H) Assemble the waistline monomer A to the main body 8 of the absorbent article. Composite the skirt structure 50 of the waistline monomer A processed in step F together with the ultrasonic compounding position in step E with the end edge in the length direction of the main body 8 of the absorbent article. After the absorbent article main body 8 is folded in half along the length direction, the two ends of the waistline monomer A in the length direction are connected to complete the assembly of the absorbent article.

As shown in FIGS. 1 to 4 , in this step, similarly to the previous step G, the manufacturer makes adaptive adjustments based on the structure of the absorbent product main body 8 selected so that it can fit the waistline of the monomer A. The structure can be adaptively configured as needed, and the present invention does not further expand or limit this.

Referring to FIG. 4 , as one of the preferred embodiments of the present invention, in step A, the spacing between the protruding connecting portions 20 arranged in the array on the surface of the hot air non-woven fabric, the spacing along the length direction of the waist base layer 2 is greater than The spacing along the width direction of the waist base layer 2.

In this embodiment, compared with the basic structure of the uniformly formed protruding connection portion 20 of the waistline base layer 2 formed, the shape of the elastic space 7 tends to be elongated, and the direction is consistent with the overall direction of the elastic waistline and the strip-shaped elasticity. The direction of the body 3 is consistent, so the curvature of the elastic space 7 finally formed is more obvious and natural, and the elastic waistline has better softness when it fits the user's skin.

As one of the preferred embodiments of the present invention, in step B, the shrinkage length of the strip elastic body 3 is 0.75-0.85 times that of the waist base layer 2, and the composite area with the waist base layer is not connected to any protruding connection portion 20 Locations overlap.

In this embodiment, the shrinkage ratio of the above-mentioned strip elastic body 3 can make the elastic space 7 have a better molding effect during molding. If the shrinkage ratio is too large, the elastic space 7 will easily collapse due to poor processing accuracy. shape, if the shrinkage ratio is too small, the elastic space 7 will not be easy to form. The above-mentioned shrinkage ratio can keep the final elastic space 7 stable and provide the due technical effects of elastic buffering, breathability, and liquid absorption.

As one of the preferred embodiments of the present invention, in step D, the density of the non-woven fabric used as the waistline surface layer 5 is 0.80-0.90 times that of the non-woven fabric used as the waistline base layer.

In the above embodiment, the density of the non-woven fabric of the waistline surface layer 5 refers to the density of the selected polymer material on the one hand. On the other hand, the size of the formed non-woven fabric gap can be further limited to make the porosity 0.80-0.90. It is twice as large as the non-woven fabric used as the base layer of the waistline. In this way, while the ventilation and breathability performance of the waistline monomer A is guaranteed, the liquid is not easy to stay on the waistline surface layer 5, but further penetrates to the PE film layer 4, and finally flows smoothly. The PE film layer 4 flows towards the core structure, reducing the dampness of the waist structure.

As one of the preferred embodiments of the present invention, in the step E, the ultrasonic wave that closely combines the shorter side edge of the waist surface layer 5 at the fold, the waist base layer 2, the PE film layer 4 with the corresponding position on the longer side of the fold is The width of the composite area shall not be greater than 1/5 of the width of the shorter side of the fold of the waist base layer 2. At the same time, the width of the longer side of the fold of the waist base layer 2 shall not exceed 3/5 of the total width of the waist base layer 2.

In the above embodiment, step E is further limited. Among the waistline monomer A formed by this size characteristic, the skirt structure 50 has the highest degree of richness, and the composite stability of the folded edges of the waistline monomer A can also be guaranteed to a certain extent. , the extra skirt structure 50 can better adapt to more types of waistline monomer A assembly styles.

Referring to FIG. 4 , as one of the preferred embodiments of the present invention, in step F, the ultrasonic composite connecting belt 6 is symmetrical to the same row of protruding connecting parts 20 parallel to the width direction of the waistline base layer 2 and is in close contact with each other. They are provided at positions on both sides of the row of protruding connecting portions 20 .

In the above embodiment, the ultrasonic composite connecting belts 6 are further limited to be arranged symmetrically on both sides of the protruding connecting parts 20 in the same row. The most important function is to allow the elastic spaces 7 in the same row to stably surround the waist length direction. arrangement, once the protruding connection part 20 at a certain point falls off, it will only merge the two small elastic spaces 7 into one large elastic space 7. Although the elastic buffering capacity of the elastic space 7 will be reduced, The softness will not decrease, and it can still provide sufficient breathability, leakage resistance and spatial deformation capabilities.

As one of the preferred embodiments of the present invention, in the step H, after the free side of the skirt structure 50 is folded again to form a pocket, the waistline single body is folded while keeping the pocket in a bulging state. The ultrasonic composite part on the shorter side, the main body of the skirt structure 50, and the edge of the pocket-shaped body of the skirt structure 50 are composited with the absorbent article.

In this embodiment, the skirt structure 50 is actually allowed to form an annular cavity surrounding the waistline of the absorbent product, which is a further utilization of the skirt structure 50. The annular cavity formed by it can be opened without opening. It is a protective structure in the outer waist area of the absorbent product. Once the opening structure is further processed into the structure, the skirt structure 50 can also form a pocket, so that the user can place a baby warmer or absorbent pad, etc. structure to improve the overall performance of absorbent products.

As shown in FIGS. 3 and 4 , as one of the preferred embodiments of the present invention, the absorbent article further includes a flow guide layer 83 disposed between the surface layer 82 and the core 81 , and a flow guide layer 83 disposed between the surface layer 82 and the bottom layer. 80 and an anti-side leakage barrier 84 at the edge of the composite portion in the length direction. Both ends of the anti-side leakage barrier 84 in the length direction are embedded in the ultrasonic composite portion of the waistline monomer A and the absorbent article main body 8 .

In this embodiment, in order to further limit the structure of the main body 8 of the absorbent article, the most important point is to add a connection composite structure between the square side leakage partition 84 and the waistline monomer A structure, so that the overall structure of the final absorbent article is stable. , and the overall structure can provide good support for the elastic waist structure.

Overall, the ultrasonic connection structure widely used in the present invention is used as the main form of assembly and connection of the waistline, which reduces the use of viscose, helps reduce the weight of absorbent products and improves portability. Moreover, for ultrasonic The connection characteristics adopt a non-woven fabric matching structure as an auxiliary method to strengthen the ultrasonic connection structure. On the premise of ensuring that the waist structure is breathable, light and comfortable, the overall structure is better than existing elastic rubber waist products during use. There will be no significant difference, so it is suitable for use by infants and young children.

The above are only preferred embodiments of the present invention. It should be noted that those of ordinary skill in the art can also make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as It is the protection scope of the present invention.

Claims (8)

1. A manufacturing process for array elastic waist pants type baby absorbent products using ultrasonic welding hot air non-woven fabrics, which is characterized by consisting of the following steps: A) Prepare the waistline base layer, and prepare a hot-air non-woven fabric on the gauze curtain with an array of raised points, so that the surface of the hot-air non-woven fabric is arranged with an array of several protruding connecting parts during curing and molding to form a waistline base layer; B) Combine the elastomers, keep the waistline base layer prepared in step A in a flat state, and evenly connect several strips of elastomers whose shrinkage length is less than the length of the waistline base layer along the length direction of the waistline base layer; C) Composite the PE film layer, keep the waistline base layer processed in step B in a flat state, cover the PE film layer on the waistline base layer, and then tightly compound the PE film layer on the protruding connection part through ultrasonic compounding; D) Prepare the waistline surface layer, prepare another piece of non-woven fabric with an area at least 3 times that of the waistline base layer and a length no less than the waistline base layer as the waistline surface layer, and fold it along a parallel line not exceeding 1/3 of the width direction; E) The waistline is compounded by itself. Keep the waistline base layer that has been compounded with the PE film layer in step C flattened and put it into the crease of the waistline surface layer that has been folded in step D. Fold the shorter edge of the waistline surface layer and the waistline. The base layer, PE film layer and the corresponding position on the longer side of the fold are closely combined in the form of ultrasonic compounding; F) Waist elastic space forming, keep the waist base layer processed in step E flat, and combine several strip-shaped ultrasonic composite connections at equal intervals in the direction perpendicular to the direction of the strip-shaped elastic body, without overlapping the protruding connection parts. The belt divides the non-woven space between the strip elastic bodies into several elastic spaces to form a waistline monomer with a free skirt structure composed of the remaining longer side area of the fold; G) Prepare the main body of the absorbent product, which will include at least the bottom layer, the core body, and the top layer and are closely compounded in sequence to form the main body of the absorbent product; H) Assemble the waistline monomer to the main body of the absorbent article. Composite the skirt structure of the waistline monomer processed in step F together with the ultrasonic compounding position in step E with the end edge in the length direction of the main body of the absorbent article. Place the main body of the absorbent article along the length. After folding in half, connect the two ends of the waistline body in the length direction to complete the assembly of the absorbent product. 2. The manufacturing process of array elastic waist pants type baby absorbent products using ultrasonic welding of hot air non-woven fabrics according to claim 1, characterized in that in step A, the array is arranged on the protruding connection portion of the surface of the hot air non-woven fabric The spacing between them, the spacing along the length direction of the waist base layer is greater than the spacing along the width direction of the waist base layer. 3. The manufacturing process of array elastic waist pants-type baby absorbent products using ultrasonic welding hot air non-woven fabric according to claim 1 or 2, characterized in that in the step B, the shrinkage length of the strip elastomer is waist circumference The base layer is 0.75-0.85 times, and the composite area with the waistline base layer does not overlap with any protruding connection portion. 4. The manufacturing process of array elastic waist pants type baby absorbent products using ultrasonic welding hot air non-woven fabric according to claim 1, characterized in that in step D, the density of the non-woven fabric as the waist surface layer is 0.80-0.90 times The density of the non-woven fabric used as the waistline base layer. 5. The manufacturing process of array elastic waist pant-type baby absorbent products using ultrasonic welding hot air non-woven fabric according to claim 1, characterized in that in the step E, the shorter side edge of the folded waist surface layer, the waist circumference The width of the ultrasonic composite area where the base layer, the PE film layer and the longer side of the fold are closely combined should not be greater than 1/5 of the width of the shorter side of the fold of the waist base layer. At the same time, the fold of the waist base layer is longer. The width of the side shall not exceed 3/5 of the total width of the waistline base layer. 6. The manufacturing process of array elastic waist pant-type baby absorbent products using ultrasonic welding hot air non-woven fabric according to claim 2, characterized in that in the step F, the ultrasonic composite connecting belt is symmetrical to the waist base. The protrusion connecting portions of the same row in the width direction of the bottom layer are provided at positions closely adjacent to both sides of the row of protruding connecting portions. 7. The manufacturing process of array elastic waist pants type baby absorbent products using ultrasonic welding hot air non-woven fabric according to claim 1, characterized in that in the step H, the free side of the skirt structure is folded again to form After forming the pocket body, while keeping the pocket body in a bulging state, combine the ultrasonic composite part on the shorter side of the folded part of the waistline monomer, the main body of the skirt structure, and the edge of the pocket body of the skirt structure with the absorbent article. 8. The manufacturing process of array elastic waist pants-type baby absorbent products using ultrasonic welding hot air non-woven fabric according to claim 1, characterized in that the absorbent product further includes a flow guide disposed between the surface layer and the core body. layer, and an anti-side leakage barrier provided at the edge of the lengthwise combination of the surface layer and the bottom layer. Both ends of the lengthwise direction of the anti-sideleakage barrier are embedded in the ultrasonic combination of the waistline monomer and the main body of the absorbent article.