CN1219108A - Strectable mechanical/adhesive closure for a disposable diaper - Google Patents

Abstract

This invention is a fastening system for securing a diaper having both mechanical and an adheive or cohesive securement. Tab members comprise a face stock layer, a contact layer of adhesive or cohesive overlying at least a portion of face stock layer, and mechanical fastening elements projecting from at least a portion of the contact layer. The face stock layer includes extensible and substantially nonextensible polymeric portions. A landing member includes complementary mechanical fasteing elements.

Description

The movable hasp of the telescopic machinery that disposable diaper is used/binding agent

Present patent application be filed an application on January 16th, 1996, part that application number is 60/010042 United States Patent (USP) provisional application continues, and requires to enjoy priority.

Background of invention and correlation technique

The present invention relates to the edge of adjacent material or parts or partial fixing together movable hasp (closures) and the method for manufacturing activities hasp.This movable hasp is commonly used for the movable hasp of fixed system of disposable diaper.

This class plain edition diaper widely uses.A kind of typical diaper structure is: be surrounded by absorbent pad or flocculus or analog in outer plastic cover material or non-woven wadding, this non-woven wadding forms with supatex fabric and impermeable stratum (as polyethylene film) lamination.Can make liquid not stick in user permeable internal layer or lining on one's body in addition.

Pull stap (fastener tape) system generally includes an end of each side that is fixed on the diaper combinative structure, is adopted the bonding loop of buckleing of permanent " factory's stitching (factoryjoint) " that binding agent or other technology form by diaper manufacturer.The one side of this button loop is coated with contact adhesive.This button loop can " user connects (userjoint) " mode be linked the other end of each side of diaper, and can throw off.This connection can be thrown off, so that forever remove diaper and unclamp diaper so that diaper is checked, if desired, can retighten subsequently.

No matter the outer surface of diaper is wadding system plastic sheeting system or non-woven, all be to be directly connected on the outer surface of diaper by the button loop just to form user's connection.For outer surface is plastic sheeting, usually, have on the surface layer one that constitute by reinforcing band or analog, be used for accepting detaining the loop end to form " overlap " that the user connects, this overlap can be a kind of frosting or supatex fabric surface and the overlap joint liner that can comprise a kind of knitting kind fabric.

As described in United States Patent (USP) 4795456,4710190,4020842 and 3833456, the pull stap system can only utilize contact adhesive to constitute " user's connection ".United States Patent (USP) 5019065,5053028 and 4869724 has been introduced binding agent and the combined hasp system of mechanical system.It is for reference that various technology in these patents have all been listed this paper in.

Adopt extensile or telescopic button loop can make diaper more adaptive and be safer admittedly, thereby make the user more comfortable, this also is well-known in the art.The button loop can play the tensile side belt effect of diaper.The example of this class diaper fixed system has been disclosed in United States Patent (USP) 4795456,4066081,4051853 and 3800796.

In United States Patent (USP) 3464094,4239829,5250253 and the open No.0191355 of European patent, introduced correlation technique.

The invention provides a kind of extensile button loop hasp system with " user's connection ", this system can implement machinery and bonding combined being connected.The effect that fastens diaper or " user is connected " is played in this machinery and bonding connection separately, make diaper become integral body or have bulk strength, but these two kinds of connections can not very provide required integral body fastening intensity effectively.This button loop hasp system can make by the high speed manufacture method that comprises co-extrusion.

In illustrative embodiment, this fixed system buckle strap piece comprises a precoat, contain one deck superimposed at binding agent to the small part precoat or union body (cohesive) the contact fixing part and protrude to the fixed mechanical component of small part contact layer.Button loop contact fixing part is dispersed throughout on the polymerization precoat extensile and not extensible basically to small part.Bridge piece comprise additional fixed mechanical component and contain contact surface or with the fixing part that contacts of button loop binding agent or the union body that link to engage.

Brief description of drawings

Fig. 1 is the button loop hasp perspective view according to button loop hasp of the present invention system;

Fig. 2 is exploded view 1 a button loop hasp system applies on the diaper with button loop the time, and the button loop is prepared the scaled fragmentary, perspective view of expanded position that fastens;

Fig. 3 shows the partial plan of making button loop hasp method of the present invention; With

Fig. 4 is according to another embodiment of the invention and the perspective view similar button loop hasp of Fig. 1.

Referring to Fig. 1 and Fig. 2, showed among the figure that the diaper that is used to fasten diaper 12 buckles loop 10.This diaper is buckled loop 10 and is comprised a fabric membrane 14, adhesive phase 16 and mechanical engagement or buckling element 18.

Fabric membrane 14 comprises extensile mid portion 14a and not extensible both ends 14b.Extensible portion 14 a can be that the elastomers such as thermoplastic elastomer (TPE) of Kraton are made by the brand as Shell Chemical Company sale.This class elastomer can be SBS, SIS, SI, S (IS) x and SEBS block copolymer and their mixture.Not extensible portion 14b in the film 14 can be made by polypropylene, polyethylene and the mixture of polymers with film forming characteristics.

Adhesive phase 16 can be by known jointing material, as comprises that the contact adhesive of acrylic resin and natural or synthetic rubber based adhesive constitute.Preferred adhesive comprises as disclosed by isoprene deutero-elastomer B block and the A-B-A segmented copolymer hot melt contact adhesive be made up of the deutero-thermoplasticity A block of styrene in United States Patent (USP) 3932328.The illustrative rubber-based adhesive comprises can choose styrene-isoprene-phenylethene and the s-B-S that contains two block component such as styrene isoprene and styrene butadiene wantonly.The union body that is proposed in layer 16 United States Patent (USP) 5085655 that also can contain as Mann, this patent also is that this paper assignee is all.Can adopt hot melt, solvent method or emulsion technology applying adhesive or union body.This bonding or union body layer 16 can extend to part or all surfaces almost along layer 14 adjacently situated surfaces.

Mechanical organ 18 in illustrative embodiment with fabric membrane 14 molding integrally.Yet element 18 also is attached on the surface of lining after the molding separately again.Element 18 is vertical with fabric membrane 14 usually and pass adhesive layer 16 and stretch out.The ridge that is provided by the external part or the bared end of element 18 should have enough length so that realize mechanical engagement with mechanical organ snap close or interlock array or with fibrous material (the non-woven lap belt with fiber 20a as shown in Figure 2 or non-woven wadding of bridge piece 20 or diaper).In addition, forming not the polymer of extensible portion 14b and element 18 should have enough rigidity and engage required shear strength to provide.Preferably only along extensible portion 14b configuration element 18 not, because it is believed that the lateral displacement tendency by limiting element 18 can improve shear resistant.

Contact adhesive has bigger extensibility or scalability than other adjacent layer comparatively speaking, thereby the total stretch characteristics of button loop 10 is suitable with fabric membrane 14 basically.Button loop 10 comprises intermediate elastic portion 10a suitable with fabric membrane 14a position and the not extensible two ends 10b suitable with fabric membrane 14b position.As shown in the figure, 14a and 14b each several part stretch at button loop length direction after stretching, extension between the diaper two ends to be joined, and length should surpass the width of buckleing loop 10 between the diaper end positions.

Referring to Fig. 2, an end 10b of button loop 10 is fixed on by " factory's stitching " at least one side of an end of diaper 12.The other end 10b unclamps, and for forming " user is connected " with lap belt 20, can make diaper center on user (as the baby) and wrap up.Near the not extensible lining part that each end of detaining loop 10 is provided with, wherein an end supplies and diaper work " factory's stitching ", and the other end can be operated button loop formation " user's connection ", and this is conspicuous.

Button loop 10 and bridge piece 20 provide the hasp system with machinery and two kinds of joining forms of binding agent.During use, in fact mechanical organ 18 provides shear strength and in fact pressure sensitive adhesive layer provides adhesion strength.Adhesion strength can be with bonding realization of binding agent between the fibrous surfaces of pressure sensitive adhesive layer 16 and bridge piece 20.If layer 16 is union bodies, bridge piece 20 also must contain the coating that union body is constituted as the discrete union body microgranule that is carried by 20 a of the fiber in the whole length range so; Or as a kind of independent union body zone

Referring to Fig. 3, a co-extrusion head mold 22 is extruded fabric membrane 14 with co-extrusion arranged side by side, and this co-extrusion plastic film comprises extensile polymeric film 14a and adjacent with it not extensible polymeric film 14b.For simplicity, 14 of films as shown in the figure comprise limited several adjacent extensible and not extensible film portion, still, also extrudablely go out along the width of film 14 or how so mutual neighbour's film portion is laterally arranged.

The film of extruding from die head 10 14 enters to the molding-setting roll 24 that further is shaped to thin film.In this case, roller 24 matches with die head 10, to form mechanical engagement element 18 along not extensible film portion 14b at least.This element 18 can be different shape, all is well-known technically as hook solid or mushroom.Fibre hook and fibrous ring joint element are preferred.

Each plastic material melt flow characteristics of co-extrusion technological requirement molding 14a part and 146 parts matches each other or mates substantially.This coupling and process technology are known technically, and existing explanation in as United States Patent (USP) 3800796.

Adhesive phase 16 be coated on along the whole length of fabric membrane 14 that is provided with element 18 lip-deep.As mentioned above, the thickness of adhesive phase 16 should guarantee that the enough extension elongations of element 18 are to reach mechanical engagement.This binding agent can be when film 14 be made or film make the back coating, and in either case, all can adopt extension elongation known, that technology that can adjust thickness guarantees element 18.Fig. 3 has showed and a kind of adhesive phase 16 has been coated to adhesive coated roller 26 on the film 14.

Shown in dotted outline among Fig. 4, the film 14 that is coated with adhesive phase 16 on it is made from horizontal cutting-out by diaper manufacturer subsequently and is buckled loop 10.As mentioned above, there are an extensible portion 10a and two ends that not extensible end 10b is arranged in the middle of each button loop 10.For the purpose of explanation, the width of shown film 14 is equivalent to three button loops 10.In fact, the width of film 14 can be the width that is equivalent to many button loops.

Referring to Fig. 4, button loop 30 comprises precoat 32, adhesive phase 34 and mechanical engagement element 36.In button loop 30, a plurality of extensible portion 32a are arranged along button loop length direction.Compare with button loop 10, this button loop 30 is extensile equally, but it does not have single middle extensible portion.In addition, the element 36 in the button loop 30 is provided with along adhesive phase 34 whole surfaces.Yet element 36 also can be as above-mentioned embodiment only be configured in not on the extensible portion 32b with similar methods.

Though, the present invention diagram and explanation have been done according to each embodiment, but this is just in order to illustrate the present invention rather than limitation of the present invention, various changes and modification with the particular that illustrates herein all belong to the spirit and scope that the present invention expects, this is apparent to those skilled in the art.Therefore, this patent is neither be confined to the scope and the effect of particular shown and described herein, also in no case is and caused by the progressive degree varies technically that the present invention promoted.

Claims (20)

1. one kind makes first parts and the second parts firm engagement together, and the fixed system that can throw off, described fixed system comprises button loop and the bridge piece that is separately fixed on described first and second parts, described buckle strap piece comprises precoat, comprise the superimposed first contact fixture and stretching out in to first fixed mechanical component of described first contact layer of small part at first contact layer to the small part precoat, described precoat comprises extensile and not extensible basically polymer moieties, described button loop has suitable with precoat basically extensibility feature, and described bridge piece comprises second fixed mechanical component that is bonded with each other with mechanical type with described first fixed mechanical component and contacts the fixed second contact fixture with described first contact layer.

2. according to the fixed system of claim 1, comprising described extensible portion and substantially not the described precoat of extensible portion through co-extrusion.

3. according to the fixed system of claim 1, wherein said first contact layer is superimposed to the extensible of the described precoat of small part and extensible portion not basically.

4. according to the fixed system of claim 1, wherein said first fixed mechanical component only protrudes from the described first contact layer surface of superimposed not extensible portion on precoat.

5. according to the fixed system of claim 1, wherein said first and second fixed mechanical components comprise crotch and ring part respectively.

6. according to the fixed system of claim 5, wherein said fiber is also as the described second contact fixture.

7. according to the fixed system of claim 1, wherein said first contact layer is one deck pressure sensitive adhesive layer.

8. according to the fixed system of claim 1, wherein said first contact layer is a union body layer.

9. fixed system according to Claim 8, the wherein said second contact fixture is the second union body layer.

10. one kind can make diaper center on user to close up and fasten, and the fixed system that can throw off comprise be separately fixed at described diaper two corresponding end buckle loop and bridge piece, described each buckle strap piece comprises precoat, comprise the superimposed first contact fixture and stretching out in to first fixed mechanical component of above-mentioned first contact layer of small part at first contact layer to the small part precoat, described precoat comprises extensile and not extensible basically polymer moieties, described button loop has suitable with precoat basically extensibility feature, described first contact layer is superimposed on the described precoat polymer moieties to small part, and described bridge piece comprises second fixed mechanical component that is bonded with each other with mechanical type with described first fixed mechanical component and contacts the fixed second contact fixture with described first contact layer.

11. according to the diaper of claim 10, comprising described extensible portion and not the described precoat of extensible portion through co-extrusion.

12. according to the fixed system of claim 10, wherein said bridge piece comprises the fabric of the fiber that constitutes second fixed mechanical component.

13. according to the fixed system of claim 12, wherein said fiber also constitutes the described second contact fixture.

14. according to the fixed system of claim 13, wherein said first contact layer is a pressure sensitive adhesive layer.

15. fixed system according to claim 10, wherein said first contact layer is the union body layer, the described second contact fixture is the second union body layer, and described first and second contact layers are at fixed system described diaper to be played conjugation when user is fastened.

16. fixed system according to claim 10, wherein said buckle strap piece has certain length and width, described buckle strap piece along its length extending to closing up described diaper, and can throw off, described polymer moieties stretches along button loop length direction, and length surpasses substantially buckles the loop width between the diaper end positions.

17. a manufacturing makes the method for first parts and second parts firm engagement fixed system together, that also can throw off, described fixed system comprises button loop and the bridge piece that is separately fixed on described first and second parts, and this manufacture method comprises the steps:

Obtain containing extensible and the precoat of not extensible polymer moieties basically by co-extrusion, for the stratiform product that is shaped to described buckle strap piece, at coating first contact layer to the small part precoat, and formation stretches out in to first fixed mechanical component of small part first contact layer, layered product is cut into the buckle strap piece of certain-length and width, so that described polymer moieties stretches along button loop length direction, length surpasses substantially buckles the loop width between the diaper end positions, the extensibility feature of described buckle strap piece is equivalent to the extensibility of precoat basically

The described bridge piece that comprises second mechanical fixed part that is bonded with each other with mechanical type with first fixed mechanical component and contact the fixed second contact fixture with first contact layer is provided, and

Described button loop and bridge piece are fixed on described first and second parts.

18. according to the method for claim 17, wherein said bridge piece comprises the fabric with the fiber that constitutes second fixed mechanical component.

19. according to the fixed system of claim 18, wherein said fiber also constitutes the described second contact fixture and described first contact layer is a pressure sensitive adhesive layer.

20. according to the fixed system of claim 18, wherein said first contact layer is that union body layer and the described second contact fixture comprise the second union body layer.

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