Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
  • A61F13/56—Supporting or fastening means
  • A61F13/58—Adhesive tab fastener elements
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
  • C09J7/38—Pressure-sensitive adhesives [PSA]

Definitions

• Adhesive tape and method for producing it are Adhesive tape and method for producing it
• the invention relates to a method for producing an adhesive tape for redetachable closure or fixing, comprising a strip-like carrier, said carrier being coated with a self- adhesive agent, at least on the active area which during use of said adhesive tape is brought into contact with a counter surface.
• the invention relates to an adhesive tape for redetachable closure or fixing, comprising a strip-like carrier, said carrier being coated with self-adhesive agent, at least on the active area which during use is brought into contact with a counter surface.
• such adhesive tapes should solve two opposing objects: They should have sufficient high adhesion which is ensured already by light pressing of the adhesive tape against an uneven surface, and it should be possible to repeatedly peel them of from said surface for opening without destroying said counter surface.
• the last mentioned object is particuly difficult to solve if the counter surface against which the adhesive tape is pressed with its redetachable area consists of a thin plastic foil, a sensitive fabric or the like. This problem arises particularly with disposable diapers which are covered on the after donning the diaper outer side with a water proof plastic foil which for cost reasons alone but also for improving wearing comfort should be made as thin as possibly.
• An adhesive tab used for such a disposable diaper must repeatedly be opened for inspection of the diaper and for correction of the diaper fit.
• the high adhesive force welcome to ensure a save diaper closure, however, easily causes destruction of said thin cover foil of the diaper when peeling off the adhesive tape.
• EP 0 269 713 El discloses particularly in figure 6 an adhesive tape designed for closing containers, which in its detachable area is provided with an adhesive pattern consisting merely of thin lines.
• the section of the adhesive tape designed to be fixed to the counter surface as firm and undetachable as possible comprises on its surface a completely covering, i.e. continuous layer of adhesive agent, while the opposing end of said adhesive tape is free of glue thereby forming a strap which can be grasped by a person in order to lift the section covered with a light adhesive pattern only from the counter surface.
• a fixing tab for a diaper with a flat carrier being coated on one side with discrete adhesive segments made of self-adhesive agent, at least on the section being designed to be sticked during use to the second diaper part, whereby said self-adhesive agent has such adhesive forces that the fixing tab formed by coating with the self-adhesive agent comprises a peel resistance of a defined value against the outer foil of the diaper and can be detached several times from the outer foil and reattached without damaging the foil.
• the adhesive tape produced in the inventive manner shows a very good adhesiveness, however, can be lifted easily from the counter surface.
• the surface pattern, e.g. checkered pattern, of the adhesive tape consisting of adhesive squares or areas and imprinted, non-adhesive areas, will be slightly stretched when lifting off the adhesive tape; the surface of the counter part, e.g.
• a thin plastic foil during the lifting procedure is only stretched between two non-adhesive points of the pattern in the peeling direction, whereby the forces imposed on the counter surface are spread evenly in all directions and therefore stress the, e.g. thin foil forming the counter surface only within its elastacy, i.e. without damaging it.
• the separating pattern can be comprised of discrete points or areas and/or extended areas.
• a geometry of a separating pattern has advantages in which the adhesive layer is interrupted by sections of the separating pattern in the area of the preferred peel line.
• the preferred peel line can extend exactly transversally to the adhesive tape, it is preferably arranged, however, under a peel angle of e.g. 30_.
• the separating pattern can be produced using roller printing or by means of a silk screen and is preferably made from paint, ink, powder or silicon oil.
• the carrier can be made of foil, paper, woven or non-woven fabric, in case of a foil the foil preferably consists of polyethylene, polypropylene, polyvinylchloride or polyester. Also a fleece or non- woven fabric made of polypropylene or polyester can be used.
• the adhesive tape can comprise a second section, adjacent to the active area, which second section comprises a continuous layer of an adhesive agent which is overall active, too.
• a second longitudinal section serves as a means to fix the adhesive tape permanently to a basic surface.
• the continuous layer of adhesive agent can be the same as the adhesive layer of the first longitudinal section; taking into account special restrictions, however, it can be different.
• the carrier can comprise a lift strap arranged in a section adjacent to its active area.
• the section forming the lift strap can consist of an area free of adhesive agent or of a section that was coated with adhesive agent and covered with a protective foil or separating foil thereafter.
• the active area of the adhesive agent can comprise a continuous layer of adhesive agent which in turn comprises a print coverage thereon covering said first layer completely in order to adjust a reduced adhesive retention force, said print coverage made of a material like paint, ink, powder, silicon oil or the like.
• the adhesive layer on the lower surface can be an ordinary, overall active layer of adhesive agent or glue, or can be a special adhesive layer comprising the features of claim 3 or claim 4.
• Figure 1 an adhesive tape in perspective view
• Figure 2 - a section of the adhesive tape shown in figure 1 in enlarged scale compared to figure 1 at the beginning of lifting off the tape from a foil forming the counter surface;
• Figure 3 the advanced lifting procedure in a depiction according to figure 2;
• Figure 5 in top view an alternative embodiment of an adhesive tape
• Figure 6 in a schematic drawing production of an adhesive tape according to figure 5;
• Figure 7 a symbolic depiction of the peeling forces induced into a counter surface by said adhesive tape;
• Figure 9 the peel angle as well as the peel line.
• the adhesive tape shown in figure 1 consists of a strip-like carrier 1, being coated on its top surface with a continuous layer of adhesive agent 2.
• a separating pattern 4 is imprinted on this adhesive layer 2 in order to reduce the active adhesive area, whereby said separating pattern comprises discrete non-adhesive areas which are symmetric and evenly arranged.
• a second longitudinal section 5 adjacent to said separating pattern 4 the adhesive layer 2 is not coated; the active adhesive area is therefore formed by the surface of the second longitudinal section 5, which is used for permanently fixing the adhesive tape to a basic surface.
• Figure 1 furthermore shows that carrier 1 comprises a glue-free section forming a finger lift strap 6 being arranged opposite said second longitudinal section 5.
• Figures 2 and 3 show a detail of longitudinal section 3 coated with said separating pattern 4 stickingly fixed to a counter surface 7 in form of a plastic foil.
• Figure 4 shows six different embodiments for separating pattern 4. Two of these examples show separating pattern 4 comprising extended areas 8, while the remaining four examples comprise discrete areas 9 in form of crosses or asterisks.
• Figure 5 shows an embodiment of the adhesive tape being modified compared to figure 1.
• the first longitudinal section 3 forming the active area of the adhesive tape comprises an imprinted non- or less-adhering separating pattern 10 and an adhesive pattern 1 1 of self-adhesive agent printed into the blank spaces of said separating pattern.
• the separating pattern 10 is grid- or sieve-like, while the adhesive pattern 11 is comprised of discrete glue segments.
• Figure 6 shows in a symbolic manner production of the active area 3 :
• the carrier 1 is firstly conveyed in direction of the arrow through a printing station 12 for the separating pattern, which imprints separating pattern 10 on the active area 3, and is thereafter conveyed to printing station 13 for the adhesive pattern, printing the adhesive agent in the blank spaces (sieve spaces) of separating pattern 10.
• a printing procedure can be carried out in reversed order, too.
• Figure 7 symbolizes the peel force induced by adhesive tape 14 into counter surface 7, which force between the two dotted lines amounts to about a third of lifting force F and outside this central region amounts to about a sixth of lifting force F.
• Figure 8 symbolizes the shear force between adhesive tape 14 and counter surface 7.
• Figure 9 shows an adhesive tape 14, which is lifted of a counter surface 7 along an advancing peel line 15, which encloses a peel angle a with a line extending transversally of lifting tab 14.
• the separating pattern 4 or 10, respectively should be arranged or designed in a manner so that peel line 15 consistently crosses sections of separating pattern 4 or 10, respectively, so that in the region of peel line 15 no continuously extending area of adhesive agent or glue exists

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• Health & Medical Sciences (AREA)
• Heart & Thoracic Surgery (AREA)
• Organic Chemistry (AREA)
• Epidemiology (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Chemical & Material Sciences (AREA)
• Vascular Medicine (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Adhesive Tapes (AREA)

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Publications (2)

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• 1996
  • 1996-06-07 WO PCT/US1996/009711 patent/WO1996041604A1/en not_active Ceased
  • 1996-06-07 EP EP96919259A patent/EP0855892A1/en not_active Withdrawn
  • 1996-06-07 AU AU61647/96A patent/AU6164796A/en not_active Abandoned
  • 1996-06-07 JP JP50320497A patent/JP2002515920A/ja active Pending
  • 1996-06-07 CA CA002224562A patent/CA2224562C/en not_active Expired - Fee Related

Non-Patent Citations (2)

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