Apparatus for manufacturing disposable underpants and composite stretch panels

Abstract

This utility model discloses a disposable underwear comprising a body and an inner lining sheet. Longitudinally, the disposable underwear has a front abdomen, a crotch area, and a back. In the thickness direction, the body includes an outer layer, an inner layer, and a sheet-like elastic membrane sandwiched between the outer and inner layers. The inner lining sheet is fixed to the skin side of the inner layer and at least covers the crotch area, forming a composite zone. The disposable underwear has lateral elasticity in the front abdomen and back, and bidirectional elasticity in both the lateral and longitudinal directions in the composite zone. In the composite zone, the longitudinal elastic elongation ratio is greater than the lateral elastic elongation ratio. Laterally, the elastic elongation ratio of the body in the front abdomen and back is greater than that in the composite zone. In the front abdomen and back, the outer layer, the elastic membrane, and the inner layer are joined together by an array of multiple first joints, and in the crotch area, they are joined together by an array of multiple second joints. Another objective of this utility model is to provide a manufacturing apparatus for a composite elastic sheet, which avoids poor crotch area coverage while improving the flatness of the crotch area.

Description

Technical Field

[0001] This utility model relates to the field of disposable hygiene products technology, and in particular to disposable underwear made primarily of nonwoven fabric, and especially to a manufacturing device for disposable underwear and composite stretchable sheet. Background Technology

[0002] Underwear is a common type of intimate clothing, typically characterized by its softness, comfort, and breathability. However, due to the need for frequent washing and changing, it can be inconvenient for frequent travelers. Disposable underwear perfectly meets these needs during special times, offering cleanliness, hygiene, and portability, while eliminating the hassle of daily washing and drying. Disposable underwear usually consists of a main body with a front abdomen, crotch, and back panel. Generally, the main body comprises an outer layer, an inner layer, and an elastic component sandwiched between the outer and inner layers. This elastic component can be made of elastic materials such as filamentous spandex or sheet-like elastic membranes. The main body has orthogonal horizontal and vertical axes; the horizontal axis aligns with the direction of elastic component expansion and contraction, while the vertical axis is orthogonal to the direction of elastic component expansion and contraction.

[0003] For disposable underwear made primarily of traditional nonwoven fabric, an inner lining is usually fixed to the inner surface of the crotch area to provide some softness or absorbency. Therefore, the crotch area generally has no elasticity, or only elasticity along the direction of elasticity (lateral) and not along the direction perpendicular to the elasticity (longitudinal).

[0004] Due to a lack of elasticity or insufficient elasticity in the crotch area, there is a lack of upward lifting force (towards the abdomen and back), or the elasticity of the front abdomen, back, and leg openings may be too tight, resulting in uneven force on the crotch area. The crotch area is pulled down, resulting in poor fit and poor wrapping. In severe cases, the crotch may even slip down.

[0005] In the prior art, in order to improve the upward lifting effect of the crotch, an elastic line (or rubber band) can be set in the crotch along the longitudinal direction. However, this method of adding an elastic line will result in the crotch not being flat enough and the crotch being bulky. Moreover, this method increases the cost of materials and the complexity of manufacturing equipment. Utility Model Content

[0006] This utility model provides a manufacturing device for disposable underwear and composite stretchable sheet to solve the technical problems of existing disposable underwear where the crotch area is pulled down, the crotch area has poor fit and poor wrapping, and the crotch area is not flat enough and bulky.

[0007] The technical solution provided by this utility model is as follows:

[0008] One objective of this utility model is to provide disposable underwear, which includes at least a body and an inner lining; the disposable underwear has mutually orthogonal longitudinal, transverse and thickness directions when unfolded.

[0009] Along the longitudinal direction, the disposable underwear has a front abdomen disposed on the side of the wearer's abdomen, a back disposed on the back of the wearer's back, and a crotch disposed between the front abdomen and the back, with at least two curved leg circumference lines on both sides of the crotch.

[0010] Along the thickness direction, the body includes an outer sheet, an inner sheet, and a sheet-like elastic membrane sandwiched between the outer sheet and the inner sheet; along the thickness direction, the inner liner is fixed to one side of the inner sheet on the skin side and the inner liner at least covers the crotch area, forming a composite area;

[0011] In the front abdomen and the back, the outer sheet, the elastic membrane and the inner sheet of the body are joined together by an array of multiple first joints; in the crotch area, the outer sheet, the elastic membrane and the inner sheet of the body are joined together by an array of multiple second joints.

[0012] The disposable underwear has lateral elasticity in the front abdomen and the back, and bidirectional elasticity in the composite area, both laterally and longitudinally.

[0013] The disposable underwear in the composite area has a longitudinal elastic elongation ratio greater than the transverse elastic elongation ratio, and the difference between the longitudinal elastic elongation ratio and the transverse elastic elongation ratio of the disposable underwear in the composite area is less than 20%.

[0014] In the transverse direction, the elastic elongation ratio of the disposable underwear in the front abdomen and the back is greater than that in the composite area.

[0015] In a preferred embodiment, the density of the plurality of second joints is less than the density of the plurality of first joints, and, in the transverse direction, the size of the second joints is smaller than the size of the first joints.

[0016] In a preferred embodiment, the leg circumference line extends from the front abdomen through the crotch to the back;

[0017] At least in the composite area, the disposable underwear is provided with leg reinforcement in an area of ​​60% to 100% along the leg circumference contour; the leg reinforcement is formed by adhesive, hot pressing or ultrasonic means.

[0018] In a preferred embodiment, the first joint is penetrated to form a first through hole, the second joint is penetrated to form a second through hole, and the area of ​​the second through hole is smaller than the area of ​​the first through hole.

[0019] In a preferred embodiment, the first joint is penetrated to form a first through hole, and the second joint does not form a second through hole.

[0020] In a preferred embodiment, the elastic elongation ratio of the disposable underwear in the front abdomen and the back is 150% to 350% in the transverse direction; and the elastic elongation ratio of the disposable underwear in the composite area is 100% to 200% in the transverse direction.

[0021] In a preferred embodiment, the body further includes end sheets along the longitudinal direction near the waist opening on the front abdomen and back.

[0022] The end sheet is folded over to form a folded portion on the skin side and the non-skin side of the body; multiple elastic lines are arranged between the folded portion and the inner layer sheet, and the elastic lines extend laterally.

[0023] In a preferred embodiment, along the thickness direction, in the composite region, in the area between the leg reinforcements, the inner liner is fixed to the surface of the inner layer sheet by an adhesive portion.

[0024] In a preferred embodiment, the contours of the inner lining sheet on both sides in the transverse direction match the contours of the leg circumference; and in the longitudinal direction, the two sides of the inner lining sheet are joined to the inner layer sheet by a plurality of third joints.

[0025] Another objective of this invention is to provide a manufacturing apparatus for a composite stretchable sheet, which is used to manufacture the body of disposable underwear.

[0026] The manufacturing apparatus includes: an ultrasonic heat sealing unit, an MD extension gear roller assembly, and a CD extension gear roller assembly;

[0027] The ultrasonic heat sealing unit is used to combine the outer sheet continuous body, the inner sheet continuous body, and the sheet-like elastic membrane continuous body sandwiched between the outer sheet continuous body and the inner sheet continuous body to form a first composite stretch sheet semi-finished product.

[0028] The MD extension gear roller device is located downstream of the ultrasonic heat sealing unit and is used to extend the first composite stretch sheet semi-finished product along the MD direction to the front abdomen, crotch and back of the disposable underwear to form the second composite stretch sheet semi-finished product.

[0029] The CD extension gear roller device is located downstream of the MD extension gear roller device and is used to extend the composite area of ​​the second composite stretch sheet semi-finished product corresponding to the disposable underwear along the CD direction to form a composite stretch sheet.

[0030] The above-described technical solution of this utility model has at least the following beneficial effects compared with the prior art:

[0031] This invention provides disposable underwear. Along its thickness direction, an inner lining sheet is fixed to the skin side of the inner layer and covers at least the crotch area, forming a composite zone. The disposable underwear has lateral elasticity in the front abdomen and back, and bidirectional elasticity in both the lateral and longitudinal directions in the composite zone, giving the crotch area bidirectional elasticity in both directions. The elastic elongation ratio of the disposable underwear in the longitudinal direction in the composite zone is greater than that in the lateral direction, and the difference between the elastic elongation ratios in the longitudinal and lateral directions in the composite zone is less than 20%. This uniformly distributes stress in multiple dimensions of the crotch area, avoiding poor coverage due to insufficient crotch elasticity, or even sagging. Simultaneously, in the lateral direction, the elastic elongation ratio of the disposable underwear in the front abdomen and back is greater than that in the composite zone, thus making the lateral elasticity of the crotch area less than that in the front abdomen and back, improving the flatness of the crotch area and preventing it from becoming bulky.

[0032] This utility model provides a disposable underwear. In the front abdomen and back, the outer layer, elastic membrane and inner layer of the body are joined together by an array of multiple first joints. In the crotch area, the outer layer, elastic membrane and inner layer are joined together by an array of multiple second joints. The density of the multiple first joints is greater than the density of the multiple second joints, and the size of the second joints in the transverse direction is smaller than the size of the first joints, so that the second joints formed in the crotch area are relatively sparse, thereby improving the flatness of the crotch area and avoiding the crotch area from becoming bulky.

[0033] This invention provides disposable underwear. In the front abdomen and back, multiple first joints of the main body are penetrated to form first through holes, thereby providing good breathability to the front abdomen and back. In the crotch area, second joints are penetrated to form second through holes, and the area of ​​the second through holes is smaller than the area of ​​the first through holes, or the second joints do not form second through holes. This reduces the lateral elasticity of the crotch area compared to the front abdomen and back, improving the flatness of the crotch area and preventing it from becoming bulky. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a disposable pair of underwear in its unfolded state according to this utility model.

[0036] Figure 2 This is a schematic diagram of a disposable pair of underwear according to the present invention, which is shaped like underwear with one waist opening and two leg openings.

[0037] Figure 3 yes Figure 1 Cross-sectional view in the TT direction.

[0038] Figure 4 This is a schematic diagram showing that disposable underwear has bidirectional stretchability in the crotch area, both horizontally and vertically.

[0039] Figure 5 yes Figure 1 A magnified view of region A in the middle.

[0040] Figure 6 yes Figure 5 Cross-sectional view in the Y1-Y1 direction.

[0041] Figure 7 yes Figure 1 A magnified view of region B in the middle.

[0042] Figure 8 yes Figure 7 Cross-sectional view in the Y2-Y2 direction.

[0043] Figure 9 This is a schematic diagram of the flower-shaped structure of the second joint in some other embodiments of this utility model.

[0044] Figure 10 This is a schematic diagram of a manufacturing device for a composite telescopic sheet according to this utility model.

[0045] Figure 11 This is a schematic diagram of the outer sheet continuous, the inner sheet continuous, and the sheet-like elastic membrane continuous sandwiched between the outer sheet continuous and the inner sheet continuous, transported from the upstream side.

[0046] Figure 12 This is a side view of the ultrasonic heat sealing unit.

[0047] Figure 13 This is an axial schematic diagram of the ultrasonic heat sealing unit.

[0048] Figure 14 This is a schematic diagram of the first composite stretchable sheet semi-finished product.

[0049] Figure 15 yes Figure 14 A magnified view of region C in the middle.

[0050] Figure 16 yes Figure 15 Cross-sectional view along the Y3-Y3 direction.

[0051] Figure 17 yes Figure 14 A magnified view of region D in the middle.

[0052] Figure 18 yes Figure 17 Cross-sectional view along the Y4-Y4 direction.

[0053] Figure 19 This is an axial schematic diagram of the MD extended gear roller assembly.

[0054] Figure 20 It is a schematic diagram showing the first tooth and the second tooth alternately inserting into the second valley and the first valley.

[0055] Figure 21 This is a schematic diagram of the MD extension gear roller device, which extends along the MD direction to the front abdomen, crotch and back of the first composite stretchable sheet semi-finished product corresponding to disposable underwear.

[0056] Figure 22 This is a schematic diagram of the semi-finished product of the second composite expansion joint.

[0057] Figure 23 yes Figure 22 A magnified view of region E in the middle.

[0058] Figure 24 yes Figure 23 Cross-sectional view along the Y5-Y5 direction.

[0059] Figure 25 yes Figure 22 A magnified view of region F in the middle.

[0060] Figure 26 yes Figure 25 Cross-sectional view along the Y6-Y6 direction.

[0061] Figure 27 This is an axial schematic diagram of the CD extension gear roller assembly.

[0062] Figure 28 This is a schematic diagram of a CD extension gear roller device that extends along the CD direction to the crotch area of ​​disposable underwear corresponding to the second composite stretchable sheet semi-finished product.

[0063] Figure 29This is a schematic diagram of the cross-section of the composite expansion joint.

[0064] Figure 30 This is a planar schematic diagram of a composite expansion joint. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0066] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0067] It should be noted that the terms "upper", "lower", "left", "right", "front", and "back" used in this utility model are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0068] Combination Figures 1 to 9 According to an embodiment of the present invention, disposable underwear is provided. The disposable underwear includes a body 20 and an inner lining 10.

[0069] like Figure 1 and Figure 3 As shown, disposable underwear, when unfolded, has mutually orthogonal longitudinal, transverse, and thickness directions. Longitudinally, the disposable underwear has a front abdomen B1 located on the wearer's abdominal side, a back B2 located on the wearer's back side, and a crotch area B3 located between the front abdomen B1 and the back B2. Thickly, the disposable underwear has a side that contacts the wearer's skin and a non-skin side away from the skin.

[0070] like Figure 3As shown, along the thickness direction, the body 20 includes an outer sheet 21 located on the non-skin side of the wearer, an inner sheet 22 located on the skin side of the wearer, and a sheet-like elastic membrane 23 sandwiched between the outer sheet 21 and the inner sheet 22.

[0071] Along the thickness direction, the inner lining sheet 10 is fixed to one side of the inner layer sheet 22 on the skin side and the inner lining sheet 10 at least covers the crotch area B3, forming a composite area 10a.

[0072] Combination Figure 1 and Figure 2 Along the horizontal direction, the sides of the front abdomen B1 and the back B2 are formed by ultrasound or heat pressing to form side sealing parts 30. At least on both sides of the crotch B3, there are arc-shaped leg circumference lines 20d so that the front abdomen B1 and the back B2 join together to form an underwear shape with a waist opening and two leg openings. The leg circumference lines 20d match the contour of the wearer's legs to fit the contour of the wearer's legs.

[0073] Combination Figure 1 , Figure 3 and Figure 4 The disposable underwear has lateral elasticity in the front abdomen B1 and back B2, and bidirectional elasticity in the composite area 10a, giving the crotch area B3 bidirectional elasticity in both the lateral and longitudinal directions.

[0074] According to an embodiment of this utility model, in the composite zone 10a, the elastic elongation ratio of the disposable underwear along the longitudinal direction is greater than that along the transverse direction, and the difference between the elastic elongation ratio along the longitudinal direction and the elastic elongation ratio along the transverse direction in the composite zone 10a is less than 20%. Here, the elastic elongation ratio is the ratio of the maximum elongation of the material during the elastic deformation stage to its original length, usually expressed as a multiple or percentage, used to characterize the flexibility and tensile strength of the material. Generally, it is believed that, under the same material conditions, the larger the elastic elongation ratio, the greater its rebound ratio.

[0075] This invention relates to disposable underwear with lateral elasticity in the front abdomen (B1) and back (B2), and bidirectional elasticity in both the lateral and longitudinal directions in the composite area (10a). This also provides bidirectional elasticity in the crotch area (B3). In the composite area (10a), the longitudinal elastic elongation ratio is greater than the lateral elastic elongation ratio, and the difference between the longitudinal and lateral elastic elongation ratios in the composite area (10a) is less than 20%. This ensures that stress is evenly distributed in multiple dimensions in the crotch area (B3), preventing poor fit or sagging due to insufficient elasticity in the crotch area (B3). Furthermore, the elasticity in the crotch area (B3), combined with the elasticity of the front abdomen (B1) and back (B2), provides 360° three-dimensional protection along the leg contour, resulting in a snug fit around the thigh curve and greater flexibility and comfort during movement.

[0076] According to an embodiment of the present invention, in the transverse direction, the elastic elongation ratio of the disposable underwear in the front abdomen B1 and back B2 is greater than that in the composite area 10a, thereby making the stretchability of the crotch B3 in the transverse direction less than that in the front abdomen B1 and back B2, improving the flatness of the crotch B3 and avoiding the crotch B3 from becoming bulky.

[0077] Furthermore, in the transverse direction, the elastic elongation ratio of the disposable underwear in the front abdomen B1 and back B2 ranges from 150% to 350%; in the transverse direction, the elastic elongation ratio of the disposable underwear in the composite area 10a ranges from 100% to 200%.

[0078] Combination Figure 1 and Figure 3 The outer sheet 21 and inner sheet 22 of the body 20 extend from the front abdomen B1, through the crotch B3 to the back B2, and a sheet-like elastic membrane 23 is disposed between the outer sheet 21 and the inner sheet 22.

[0079] like Figure 5 and Figure 6 As shown, in the anterior abdomen B1 and posterior back B2, the outer layer 21, elastic membrane 23, and inner layer 22 of the body 20 are joined together by an array of multiple first joints 20c. The first joints 20c are formed by ultrasonic waves or hot pressing to join the outer layer 21, elastic membrane 23, and inner layer 22 together. The multiple first joints 20c are arranged in several rows at intervals along the transverse direction and in several columns at intervals along the longitudinal direction.

[0080] like Figure 7 and Figure 8 As shown, in the crotch area B3, the outer layer 21, elastic membrane 23, and inner layer 22 of the body 20 are joined together by an array of multiple second joints 20c'. The second joints 20c' are formed by ultrasonic waves or hot pressing to join the outer layer 21, elastic membrane 23, and inner layer 22 together. The multiple second joints 20c' are arranged in several rows at intervals along the transverse direction and in several columns at intervals along the longitudinal direction.

[0081] According to an embodiment of the present invention, the density of the plurality of second joints 20c' of the crotch area B3 is less than the density of the plurality of first joints 20c of the front abdomen B1 and the back B2, and the size of the second joints 20c' is smaller than the size of the first joints 20c along the transverse direction, thereby making the second joints 20c' of the crotch area B3 relatively sparse, improving the flatness of the crotch area B3 and avoiding the crotch area B3 from being bulky.

[0082] like Figure 5 and Figure 6As shown, in the anterior abdomen B1 and the posterior back B2, multiple first joints 20c are penetrated (the outer layer 21, the elastic membrane 23, and the inner layer 22 are penetrated) to form first through holes 20b. Around the first joints 20c, the elastic membrane 23 is melted to form openings 20a. In some embodiments, the elastic membrane 23 does not form openings 20a around the first joints 20c.

[0083] In this invention, multiple first joints 20c are penetrated to form first through holes 20b in the front abdomen B1 and the back B2, thereby giving the front abdomen B1 and the back B2 better breathability.

[0084] like Figure 7 and Figure 8 As shown, in the crotch area B3, multiple second joints 20c' are penetrated (the outer layer 21, elastic membrane 23, and inner layer 22 are penetrated) to form second through holes 20b', and the area of ​​the second through holes 20b' is smaller than the area of ​​the first through hole 20b. Preferably, the diameter of the second through hole 20b' is in the range of 0.5 mm to 2 mm.

[0085] In some embodiments, in the crotch portion B3, the second joint portion 20c' does not form the second through hole 20b' or only a portion of the second joint portion 20c' forms the second through hole 20b'.

[0086] In this invention, in the crotch area B3, the second joint portion 20c' is penetrated to form a second through hole 20b', and the area of ​​the second through hole 20b' is smaller than the area of ​​the first through hole 20b, or the second joint portion 20c' does not form a second through hole 20b', so that the lateral elasticity of the crotch area B3 is less than that of the front abdomen B1 and the back B2, thereby improving the flatness of the crotch area B3 and preventing the crotch area B3 from becoming bulky.

[0087] It should be noted that the edge of each first joint 20c overlaps with the edge of each first through hole 20b at least, and the edge of each second joint 20c' overlaps with the edge of each second through hole 20b' at least. That is, at least a portion of the first joint 20c is retained after the first through hole 20b formed by the first joint 20c, and at least a portion of the second joint 20c' is retained after the second through hole 20b' formed by the second joint 20c'. This is to prevent the outer sheet 21, the elastic film 23, and the inner sheet 22 from separating from each other after the first joint 20c and the second joint 20c' are completely penetrated.

[0088] In this invention, the shape and size of the first joint 20c, the opening 20a, and the first through hole 20b in the front abdomen B1 and the rear back B2 are not specifically limited. The shape of the first joint 20c, the opening 20a, and the first through hole 20b can be any one or a combination of two or more of the following: rectangular, square, annular, and elliptical.

[0089] like Figure 5 As shown in this embodiment, in the front abdomen B1 and the back B2, the combination of the first joint 20c being rectangular, the opening 20a being elliptical, and the first through hole 20b being rectangular makes the first through hole 20b more clearly visible and larger when the front abdomen B1 and the back B2 are stretched laterally, thereby giving the front abdomen B1 and the back B2 better breathability.

[0090] In some embodiments, the first joint 20c is square, annular, or elliptical, the opening 20a is annular or elliptical, and the first through hole 20b is square, annular, or elliptical, so that the front abdomen B1 and the back B2 have high flexibility.

[0091] In this invention, the shape and size of the crotch portion B3, the second joint portion 20c', and the second through hole 20b' are not specifically limited. The shape of the second joint portion 20c' and the second through hole 20b' can be square, annular, or elliptical.

[0092] like Figure 7 As shown, in this embodiment, in the crotch area B3, the second joint 20c' is annular and the second through hole 20b' is annular, thereby giving the crotch area B3 higher flexibility. Figure 9 As shown, in other embodiments, in the crotch area B3, the second joint 20c' is square and the second through hole 20b' is square.

[0093] Combination Figure 1 and Figure 3 According to an embodiment of the present invention, near the waist opening at the front abdomen B1 and the back B2, the longitudinal body 20 also includes end sheets 20e.

[0094] The end sheet 20e is folded over the skin-side and non-skin-side of the body 20 to form folded portions 20f. Multiple elastic lines 24 are disposed between the folded portions 20f and the inner layer sheet 22, and the elastic lines 24 extend laterally.

[0095] like Figure 1As shown, the leg circumference line 20d extends from the front abdomen B1, through the crotch B3, to the back B2. At least in the composite area 10a, the disposable underwear has leg reinforcement 4c covering 60% to 100% of the leg circumference line 20d contour. The leg reinforcement 4c is formed by adhesive, hot pressing, or ultrasonic treatment, and effectively prevents the lining 10 from opening or tearing near the leg circumference line 20d.

[0096] like Figure 1 and Figure 3 As shown, along the thickness direction, in the composite area 10a, in the area between the leg reinforcement portions 4c, the inner liner 10 is fixed to the surface of the inner layer 22 by the adhesive portion 4b, thereby fixing the inner liner 10 to the skin side of the body 20.

[0097] Along the transverse direction, the contours of both sides of the inner lining 10 match the contour of the leg circumference line 20d. Along the longitudinal direction, both sides of the inner lining 10 are joined to the inner layer 22 by a plurality of third joints 4a. The plurality of third joints 4a are formed by ultrasonic or hot pressing to join the two sides of the inner lining 10 to the inner layer 22, thereby strengthening the fixation of the inner lining 10 along the longitudinal direction and preventing curling at the edges.

[0098] The inner lining sheet 10 of this utility model can be a single-layer structure, a double-layer composite structure, or a multi-layer composite structure.

[0099] When the inner lining 10 is a single-layer structure, it can be a fabric or non-woven fabric made of absorbent or hydrophilic fibers.

[0100] When the inner liner 10 has a double-layer composite structure, it includes a liquid-permeable surface layer and a liquid-impermeable bottom layer. The liquid-permeable surface layer can be a fabric or nonwoven fabric made of absorbent or hydrophilic fibers, and the fabric or nonwoven fabric can be a single layer or a multi-layer structure. The liquid-impermeable bottom layer can be, for example, PE or PP plastic film, or spunbond nonwoven fabric containing a meltblown layer, or a composite film composed of nonwoven fabric and PE or PP plastic film, etc.

[0101] When the inner liner 10 has a multi-layer composite structure, it comprises a liquid-permeable surface layer, an intermediate absorbent layer, and a liquid-impermeable bottom layer. The liquid-permeable surface layer can be a fabric or nonwoven fabric made of absorbent or hydrophilic fibers, and the fabric or nonwoven fabric can be a single layer or a multi-layer structure. The liquid-impermeable bottom layer can be, for example, a PE or PP plastic film, or a spunbond nonwoven fabric containing a meltblown layer, or a composite film composed of nonwoven fabric and PE or PP plastic film. The intermediate absorbent layer can be composed of a layer containing absorbent fibers, a mixed layer of absorbent fibers and superabsorbent polymers, or a composite liquid-absorbing material layer containing superabsorbent polymers.

[0102] In this embodiment, the inner lining 10 has a multi-layer composite structure, which can provide the wearer with a drier experience.

[0103] Combination Figures 10 to 30 According to an embodiment of the present invention, a manufacturing apparatus for a composite stretchable sheet is provided for manufacturing a composite stretchable sheet P2. The composite stretchable sheet P2 is used to manufacture the body 20 of disposable underwear. Specifically, after the composite stretchable sheet P2 is combined with the inner lining sheet 10, it undergoes some processes (not shown), such as a leg arc-cutting process, a folding process, and a side sealing process, and is finally cut to form the aforementioned individual disposable underwear.

[0104] like Figure 10 As shown, a manufacturing apparatus for a composite telescopic sheet includes an ultrasonic heat sealing unit H, an MD extension gear roller assembly M, and a CD extension gear roller assembly M'.

[0105] Combination Figure 10 and Figure 11 This utility model discloses a manufacturing apparatus for a composite stretchable sheet, which has an MD direction along the flow direction, and CD directions and a thickness direction that are perpendicular to the MD direction. The MD direction corresponds to the transverse direction of the disposable underwear, and the CD direction corresponds to the longitudinal direction of the disposable underwear.

[0106] The ultrasonic heat sealing unit H is used to combine the outer sheet continuous body 21C, the inner sheet continuous body 22C conveyed from the upstream side, and the sheet-like elastic membrane continuous body 23C sandwiched between the outer sheet continuous body 21C and the inner sheet continuous body 22C to form the first composite stretch sheet semi-finished product P0.

[0107] like Figure 10 and Figure 11 As shown, a conveying roller G is provided on the upstream side of the ultrasonic heat sealing unit H to convey the outer sheet continuous 21C, the inner sheet continuous 22C, and the sheet-like elastic film continuous 23C sandwiched between the outer sheet continuous 21C and the inner sheet continuous 22C to the ultrasonic heat sealing unit H.

[0108] Specifically, the outer layer sheet continuous 21C is conveyed to the ultrasonic heat sealing unit H in an elongated state via the conveyor roller G. The inner layer sheet continuous 22C is conveyed to the ultrasonic heat sealing unit H in an elongated state via the conveyor roller G.

[0109] The elastic membrane continuous 23C is conveyed to the ultrasonic heat sealing unit H in an elongated state via the conveying roller G.

[0110] Outer sheet continuous 21C refers to a sheet material that is continuous after unwinding; inner sheet continuous 22C refers to a sheet material that is continuous after unwinding; elastic film continuous 23C refers to a sheet-like elastic film that is continuous after unwinding.

[0111] To ensure that the main body 20 of the manufactured disposable underwear has multiple laterally extending elastic threads 24 arranged between the folded portion 20f and the inner layer sheet 22 on both sides along the longitudinal direction, a continuously conveying elastic thread continuous body 24C is also arranged on both sides of the inner layer sheet continuous body 22C along the CD direction, such as... Figure 11 As shown.

[0112] Combination Figure 12 and Figure 13 The ultrasonic heat sealing unit H includes an ultrasonic welding head H1 and an ultrasonic bottom roller H2 arranged opposite to each other.

[0113] like Figure 13 As shown, along the axial direction (CD direction), the ultrasonic bottom roller H2 corresponds to the area of ​​the front abdomen B1 and back B2 of the disposable underwear, and is provided with a plurality of first protrusions H21 arranged at intervals along the circumferential direction.

[0114] Along the axial direction (CD direction), the ultrasonic bottom roller H2 corresponds to the crotch area B3 of the disposable underwear, and is provided with a plurality of second protrusions H22 arranged at intervals along the circumferential direction.

[0115] The density of the plurality of first protrusions H21 is greater than the density of the plurality of second protrusions H22. Along the circumferential direction, the size of the second protrusions H22 is smaller than the size of the first protrusions H21.

[0116] Combination Figures 10 to 18 When the outer sheet continuous 21C, the elastic membrane continuous 23C, and the inner sheet continuous 22C are conveyed between the ultrasonic welding head H1 and the ultrasonic bottom roller H2, the ultrasonic welding head H1 imparts vibration energy. On multiple first protrusions H21, the outer sheet continuous 21C, the elastic membrane continuous 23C, and the inner sheet continuous 22C are fused together to form multiple first joints 20c. On multiple second protrusions H22, the outer sheet continuous 21C, the elastic membrane continuous 23C, and the inner sheet continuous 22C are fused together to form multiple second joints 20c'. Thus, the elastic membrane continuous 23C is composited between the outer sheet continuous 21C and the inner sheet continuous 22C in an elongated state to form the first composite stretchable sheet semi-finished product P0.

[0117] like Figure 14 , Figure 15 and Figure 16 As shown, the first composite stretchable sheet semi-finished product P0 has multiple first joints 20c formed in the regions corresponding to the front abdomen B1 and back B2 of the disposable underwear. These joints are arranged in several rows along the MD direction (corresponding to the transverse direction) and several columns along the CD direction (corresponding to the longitudinal direction). Furthermore, around the first joints 20c, the elastic membrane continuity 23C is melted to form openings 20a.

[0118] In some embodiments, the elastic membrane continuity 23C is not melted around the first joint 20c, and no opening 20a is formed around the first joint 20c.

[0119] like Figure 14 , Figure 17 and Figure 18 As shown, the first composite stretchable sheet semi-finished product P0 has multiple second joints 20c' in the area corresponding to the crotch area B3 of disposable underwear, which are arranged in several rows along the MD direction (corresponding to the transverse direction) and several columns along the CD direction (corresponding to the longitudinal direction).

[0120] Since the density of the multiple first protrusions H21 is greater than the density of the multiple second protrusions H22, the density of the multiple second joints 20c' of the crotch area B3 of the first composite stretch sheet semi-finished product P0 corresponding to the disposable underwear is less than the density of the multiple first joints 20c corresponding to the front abdomen B1 and the back B2.

[0121] Since the size of the second protrusion H22 is smaller than that of the first protrusion H21 along the circumferential direction, the size of the second joint 20c' of the first composite stretch sheet semi-finished product P0 corresponding to the crotch of the disposable underwear B3 is smaller than the size of the first joint 20c corresponding to the front abdomen B1 and the back B2 along the MD direction (corresponding to the transverse direction).

[0122] The ultrasonic bottom roller H2 of the ultrasonic heat-sealing unit H of this utility model has multiple first protrusions H21 arranged circumferentially at intervals in the region corresponding to the front abdomen B1 and back B2 of the disposable underwear along the axial direction (CD direction), and multiple second protrusions H22 arranged circumferentially at intervals in the region corresponding to the crotch area B3 of the disposable underwear. The density of the multiple first protrusions H21 is greater than the density of the multiple second protrusions H22, and the size of the circumferential second protrusions H21 is smaller than the size of the first protrusions H21. This results in the density of the multiple second joints 20c' of the first composite stretch sheet semi-finished product P0 corresponding to the crotch area B3 of the disposable underwear being less than the density of the multiple first joints 20c corresponding to the front abdomen B1 and back B2 of the disposable underwear, and the size of the second joints 20c' formed by the first composite stretch sheet semi-finished product P0 corresponding to the crotch area B3 of the disposable underwear being smaller than the size of the second joints 20c' formed by the first composite stretch sheet semi-finished product P0 corresponding to the crotch area B3 of the disposable underwear being smaller than the size of the second joints 20c' formed by the first composite stretch sheet semi-finished product P0 corresponding to the front abdomen B1 ... The size of the first joint 20c formed with the back B2, so that the composite stretch sheet P2 composite liner 10 is cut into individual disposable underwear, the density of the multiple second joints 20c' formed in the crotch B3 is less than the density of the multiple first joints 20c formed in the front abdomen B1 and the back B2, and the size of the second joints 20c' in the transverse direction is smaller than the size of the first joints 20c, making the second joints 20c' formed in the crotch B3 relatively sparse, thereby improving the flatness of the crotch B3 and avoiding the crotch B3 from being bulky.

[0123] like Figure 10 As shown, the MD extension gear roller device M is located downstream of the ultrasonic heat sealing unit H and is used to extend (stretch) the front abdomen B1, crotch B3 and back B2 of the first composite stretch sheet semi-finished product P0 corresponding to the disposable underwear along the MD direction to form the second composite stretch sheet semi-finished product P1.

[0124] Combination Figure 19 and Figure 20 The MD extension gear roller device M includes a first gear roller M1 and a second gear roller M2 arranged opposite to each other.

[0125] The outer circumferential surface of the first gear roller M1 is provided with multiple first teeth M11 and first valleys M12 alternately arranged in the circumferential direction, and the outer circumferential surface of the second gear roller M2 is provided with multiple second teeth M21 and second valleys M22 alternately arranged in the circumferential direction.

[0126] The first tooth M11 is inserted into the second valley M22, and the second tooth M21 is inserted into the first valley M12. The first tooth M11 and the second tooth M21 are inserted into the second valley M22 and the first valley M12 alternately, forming the first working area x corresponding to the front abdomen B1, crotch B3 and back B2 of the disposable underwear.

[0127] Combination Figure 19 , Figure 20 and Figure 21 When the first composite stretchable sheet semi-finished product P0 passes through the first working area x, the first gear roller M1 and the second gear roller M2 rotate synchronously in opposite directions along the circumferential direction. The first composite stretchable sheet semi-finished product P0 corresponds to the front abdomen B1, crotch B3 and back B2 of the disposable underwear, and extends (stretches) along the MD direction to form the second composite stretchable sheet semi-finished product P1.

[0128] Combination Figure 22 , Figure 23 and Figure 24 When the first composite telescopic sheet semi-finished product P0 passes through the first working area x, due to the high brittleness of the first joint 20c, the first tooth M11 is inserted into the second valley M22 without contact and the second tooth M21 is inserted into the first valley M12 without contact, and the first joint 20c is penetrated to form the first through hole 20b.

[0129] Combination Figure 22 , Figure 25 and Figure 26Since, along the MD direction (corresponding to the transverse direction), the size of the second joint portion 20c' formed by the first composite stretch sheet semi-finished product P0 corresponding to the crotch portion B3 of the disposable underwear is smaller than the size of the first joint portion 20c formed by the front abdomen B1 and back B2 of the disposable underwear, when the first composite stretch sheet semi-finished product P0 passes through the first working area x, the first tooth M11 is inserted into the second valley portion M22 without contact and the second tooth M21 is inserted into the first valley portion M12 without contact. The second joint portion 20c' is penetrated to form a second through hole 20b' and the area of ​​the second through hole 20b' is smaller than the area of ​​the first through hole 20b, or the second joint portion 20c' does not form a second through hole 20b'.

[0130] When the first composite stretch sheet semi-finished product P0 passes through the first working area x, in the area outside the first joint 20c and the second joint 20c', the outer sheet continuous body 21C and the inner sheet continuous body 22C will not retract after being stretched under the action of mechanical external force, while the elastic membrane continuous body 23C will retract after being stretched. Thus, the first composite stretch sheet semi-finished product P0, corresponding to the front abdomen B1, crotch B3 and back B2 of the disposable underwear, is stretched as a whole along the MD direction to form the second composite stretch sheet semi-finished product P1.

[0131] Because the size of the second protrusion H22 of the ultrasonic bottom roller H2 corresponding to the crotch area B3 of the disposable underwear is smaller than the size of the first protrusion H21 of the ultrasonic bottom roller H2 corresponding to the front abdomen B1 and back B2 of the disposable underwear, the size of the second joint 20c' formed by the first composite stretch sheet semi-finished product P0 corresponding to the crotch area B3 of the disposable underwear is smaller than the size of the first joint 20c formed by the front abdomen B1 and back B2 of the disposable underwear. During the process of extending (stretching) the first composite stretch sheet semi-finished product P1 along the MD direction to the front abdomen B1, crotch B3, and back B2 of the disposable underwear, the area of ​​the second through hole 20b' formed by the multiple second joints 20c' in the crotch B3 area of ​​the disposable underwear is smaller than the area of ​​the first through hole 20b formed by the multiple first joints 20c in the front abdomen B1 and back B2 areas of the disposable underwear, or the second joints 20c' do not form a second through hole 20b'. This makes the composite stretch sheet P2 composite liner 10, after being cut into individual disposable underwear, have a less lateral stretchability in the crotch B3 than in the front abdomen B1 and back B2, improving the flatness of the crotch B3 and preventing the crotch B3 from becoming bulky.

[0132] like Figure 10 As shown, the CD extension gear roller device M' is located downstream of the MD extension gear roller device M and is used to extend (stretch) the composite area 10a of the disposable underwear corresponding to the second composite stretch sheet semi-finished product P1 along the CD direction to form the composite stretch sheet P2.

[0133] like Figure 27 As shown, the CD extension gear roller device M' includes a third gear roller M3 and a fourth gear roller M4 arranged opposite to each other.

[0134] Along the axial direction (CD direction), the third gear roller M3 corresponds to the composite area 10a of the disposable underwear, with multiple third teeth M31 and third valleys M32 alternately arranged. Along the axial direction (CD direction), the fourth gear roller M4 corresponds to the composite area 10a of the disposable underwear, with multiple fourth teeth M41 and fourth valleys M42 alternately arranged.

[0135] The third tooth M31 is inserted into the fourth valley M42, and the fourth tooth M41 is inserted into the third valley M32, forming the second working area 2y corresponding to the composite area 10a of the disposable underwear.

[0136] Along the axial direction (CD direction), the third gear roller M3 is provided with a first spacer M33 corresponding to the area of ​​the front abdomen B1 and the back B2 of the disposable underwear. Along the axial direction (CD direction), the fourth gear roller M4 is provided with a second spacer M43 corresponding to the area of ​​the front abdomen B1 and the back B2 of the disposable underwear.

[0137] like Figure 27 As shown, along the axial direction (CD direction), the first spacer M33 and the second spacer M43 form a first non-working area 1y corresponding to the front abdomen B1 of the disposable underwear and a second non-working area 3y corresponding to the back B2 of the disposable underwear.

[0138] Combination Figure 27 and Figure 28 When the second composite stretch sheet semi-finished product P1 passes through the second working area 2y, the first non-working area 1y, and the second non-working area 3y, the third gear roller M3 and the fourth gear roller M4 rotate synchronously in opposite directions along the circumferential direction. In the second working area 2y, the composite area 10a of the second composite stretch sheet semi-finished product P1 corresponding to the disposable underwear extends (stretches) along the CD direction. In the first non-working area 1y and the second non-working area 3y, the front abdomen B1 and back B2 of the second composite stretch sheet semi-finished product P1 corresponding to the disposable underwear do not extend along the CD direction, thereby forming the composite stretch sheet P2.

[0139] Combination Figure 28 , Figure 29 and Figure 30When the second composite stretch sheet semi-finished product P1 passes through the second working area 2y, in the area outside the second joint 20c', the outer layer sheet continuous body 21C and the inner layer sheet continuous body 22C will not retract after elongation under the tension of the mechanical external force, while the elastic membrane continuous body 23C will retract after elongation. This extends (stretches) the composite area 10a of the disposable underwear corresponding to the second composite stretch sheet semi-finished product P1 along the CD direction, forming the composite stretch sheet P2. That is, the elasticity of the composite area 10a of the disposable underwear corresponding to the composite stretch sheet P2 along the CD direction is activated.

[0140] When the second composite stretch sheet semi-finished product P1 does not extend along the CD direction in the first non-working area 1y and the second non-working area 3y, the elasticity of the composite stretch sheet P2 corresponding to the front abdomen B1 and back B2 of the disposable underwear is not activated along the CD direction.

[0141] The composite stretchable sheet P2 manufactured by this utility model is then composited with the inner lining sheet 10 in a subsequent process and cut into individual disposable underwear.

[0142] The present invention relates to an MD extending gear roller device M that extends (stretches) the first composite stretchable sheet semi-finished product P0 corresponding to the front abdomen B1, crotch B3, and back B2 of disposable underwear along the MD direction to form a second composite stretchable sheet semi-finished product P1; and a CD extending gear roller device M' that extends (stretches) the second composite stretchable sheet semi-finished product P1 corresponding to the composite area 10a of disposable underwear along the CD direction to form a composite stretchable sheet P2. The composite stretchable sheet P2 is then combined with the inner lining sheet 10 and cut into individual disposable underwear. The disposable underwear has lateral stretchability in the front abdomen B1 and back B2, and bidirectional stretchability in both lateral and longitudinal directions in the composite area 10a, giving the crotch B3 bidirectional stretchability in both lateral and longitudinal directions.

[0143] This invention adjusts the depth of the non-contact insertion of the first tooth M11 into the second valley M22 and the non-contact insertion of the second tooth M21 into the first valley M12, so that the composite stretch sheet P2 and the composite inner lining sheet 10 are cut into individual disposable underwear. In the composite area 10a, the elastic elongation ratio along the longitudinal direction (CD direction) is greater than the elastic elongation ratio along the transverse direction (MD direction), and the difference between the elastic elongation ratio along the longitudinal direction (CD direction) and the elastic elongation ratio along the transverse direction (MD direction) in the composite area 10a is less than 20%. This allows the stress to be evenly distributed in multiple dimensions of the crotch area B3, avoiding poor wrapping caused by insufficient elasticity of the crotch area B2, or serious crotch sagging.

[0144] Simultaneously, because the MD extending gear roller device M extends (stretches) the composite area 10a of the first composite stretch sheet semi-finished product P0 corresponding to the disposable underwear along the MD direction, and then the CD extending gear roller device M' extends (stretches) the composite area 10a of the second composite stretch sheet semi-finished product P1 corresponding to the disposable underwear along the CD direction, the elastic elongation ratio of the composite area 10a of the composite stretch sheet P2 corresponding to the disposable underwear along the MD direction is less than the elastic elongation ratio of the front abdomen B1 and back B2 of the corresponding disposable underwear along the MD direction. Furthermore, after the composite stretch sheet P2 is combined with the inner lining sheet 10 and cut into individual disposable underwear, along the transverse direction (MD direction), the elastic elongation ratio of the composite area 10a of the disposable underwear is less than the elastic elongation ratio of the front abdomen B1 and back B2, thereby making the stretchability of the crotch B3 along the transverse direction (MD direction) less than that of the front abdomen B1 and back B2, improving the flatness of the crotch B3 and avoiding the crotch B3 from becoming bulky.

[0145] The following points need to be explained:

[0146] (1) The accompanying drawings of this utility model embodiment only involve the structure involved in this utility model embodiment. Other structures can refer to the general design.

[0147] (2) For clarity, the thickness of layers or regions is enlarged or reduced in the drawings used to describe embodiments of the present invention, i.e., these drawings are not drawn to actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "below" another element, the element may be "directly" located "on" or "below" the other element or there may be intermediate elements.

[0148] (3) Where there is no conflict, the embodiments of this utility model and the features in the embodiments can be combined with each other to obtain new embodiments.

[0149] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. The protection scope of this utility model shall be determined by the protection scope of the claims.

Claims

1. A disposable pair of underwear, characterized in that, The disposable underwear includes a main body and an inner lining; the disposable underwear, when unfolded, has mutually orthogonal longitudinal, transverse, and thickness directions. Along the longitudinal direction, the disposable underwear has a front abdomen disposed on the side of the wearer's abdomen, a back disposed on the back of the wearer's back, and a crotch disposed between the front abdomen and the back; along the transverse direction, at least on both sides of the crotch are provided arc-shaped leg circumference lines. Along the thickness direction, the body includes an outer sheet, an inner sheet, and a sheet-like elastic membrane sandwiched between the outer sheet and the inner sheet; along the thickness direction, the inner liner is fixed to one side of the inner sheet on the skin side and the inner liner at least covers the crotch area, forming a composite area; In the front abdomen and the back, the outer sheet, the elastic membrane and the inner sheet of the body are joined together by an array of multiple first joints; in the crotch area, the outer sheet, the elastic membrane and the inner sheet of the body are joined together by an array of multiple second joints. The disposable underwear has lateral elasticity in the front abdomen and the back, and bidirectional elasticity in the composite area, both laterally and longitudinally. The disposable underwear in the composite area has a longitudinal elastic elongation ratio greater than the transverse elastic elongation ratio, and the difference between the longitudinal elastic elongation ratio and the transverse elastic elongation ratio of the disposable underwear in the composite area is less than 20%. In the transverse direction, the elastic elongation ratio of the disposable underwear in the front abdomen and the back is greater than that in the composite area.

2. The disposable brief of claim 1 wherein, The density of the plurality of second joints is less than the density of the plurality of first joints, and, in the transverse direction, the size of the second joints is smaller than the size of the first joints.

3. The disposable brief of claim 1 wherein, The leg circumference line extends from the front abdomen, through the crotch, to the back; At least in the composite area, the disposable underwear is provided with leg reinforcement in an area of ​​60% to 100% along the leg circumference contour; the leg reinforcement is formed by adhesive, hot pressing or ultrasonic means.

4. The disposable brief of claim 1 wherein, The first joint is penetrated to form a first through hole, the second joint is penetrated to form a second through hole, and the area of ​​the second through hole is smaller than the area of ​​the first through hole.

5. The disposable brief of claim 1 wherein, The first joint is penetrated to form a first through hole, and the second joint does not form a second through hole.

6. The disposable brief of claim 1 wherein, In the transverse direction, the elastic elongation ratio of the disposable underwear in the front abdomen and the back ranges from 150% to 350%; in the transverse direction, the elastic elongation ratio of the disposable underwear in the composite area ranges from 100% to 200%.

7. The disposable underwear according to claim 1, characterized in that, Near the waist opening on the front abdomen and back, the body also includes end sheets along the longitudinal direction; The end sheet is folded over to form a folded portion on the skin side and the non-skin side of the body; multiple elastic lines are arranged between the folded portion and the inner layer sheet, and the elastic lines extend laterally.

8. The disposable brief of claim 3 wherein, Along the thickness direction, in the composite area, in the region between the leg reinforcements, the inner lining sheet is fixed to the surface of the inner layer sheet by an adhesive portion.

9. The disposable brief of claim 1 wherein, In the transverse direction, the contours of the two sides of the inner lining sheet match the contours of the leg circumference; in the longitudinal direction, the two sides of the inner lining sheet are joined to the inner layer sheet by a plurality of third joints.

10. An apparatus for manufacturing a composite stretch sheet, characterized by comprising: The composite stretch sheet is used to manufacture the body of disposable underwear; The manufacturing apparatus includes: an ultrasonic heat sealing unit, an MD extension gear roller assembly, and a CD extension gear roller assembly; The ultrasonic heat sealing unit is used to combine the outer sheet continuous body, the inner sheet continuous body, and the sheet-like elastic membrane continuous body sandwiched between the outer sheet continuous body and the inner sheet continuous body to form a first composite stretch sheet semi-finished product. The MD extension gear roller device is located downstream of the ultrasonic heat sealing unit and is used to extend the first composite stretch sheet semi-finished product along the MD direction to the front abdomen, crotch and back of the disposable underwear to form the second composite stretch sheet semi-finished product. The CD extension gear roller device is located downstream of the MD extension gear roller device and is used to extend the composite area of ​​the second composite stretch sheet semi-finished product corresponding to the disposable underwear along the CD direction to form a composite stretch sheet.

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