Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
  • B65D53/04—Discs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
  • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
  • B65D41/04—Threaded or like caps or cap-like covers secured by rotation
  • B65D41/0435—Threaded or like caps or cap-like covers secured by rotation with separate sealing elements
  • B65D41/045—Discs

Definitions

• the subject of the invention is a new type of permanent heat-sealable seal.
• the closure of containers by cap or capsule prior to their first opening can be performed by means of heat sealable seals.
• seals traditionally comprise a heat-sealable seal intended to be applied to the rim of the container, said seal being permanently associated with a support in contact with the bottom of the stopper or the cap.
• so-called “heat-sealable” covers consist of the combination, by means of binding agent, of a plastic film chosen according to the nature of the material constituting the container, with a film made of a dielectric material, practice of aluminum, intended to soften by induction or conduction said plastic film with which it is in contact resulting in the sealing of the lid on the rim of the container.
• the traditional supports used are polyolefin foams and in particular foams of polyethylene or polypropylene with a thickness of between 120 ⁇ m and 250 ⁇ m necessarily having, on at least the face in contact with the bottom of the capsule, a PET film secured with glue.
• the presence of this film is indispensable in that it avoids any risk of heat sealing the seal on the capsule at the time of the heat sealing operation, insofar as the capsules are generally made of polypropylene (PP) or high density polyethylene (HDPE).
• the support makes it possible to absorb the tolerances between the bottom of the capsule and / or the stopper.
• US 2007/007229 discloses a temporary heat seal seal, ie a seal not in one piece, but in two pieces.
• the support is made of PET expanded and provided on its underside with a thermoplastic film.
• the lid itself comprises an aluminum foil covered on its underside with a heat-sealing film and on its upper side with a thermoplastic film. The association of the two thermoplastic films of the support and the cover respectively provide the temporary connection.
• JP 2006/123970 discloses a non-heat sealable seal consisting of a PET foam coated on each side with a polyethylene film.
• the problem to be solved by the invention is to develop heat sealable seals having the simplest structure possible by limiting as much as necessary the number of elements and therefore the cost of manufacture.
• the Applicant has found that, quite surprisingly, the substitution of a polyolefin foam, in particular of polyethylene or polypropylene, with a polyester foam in a permanent joint makes it possible to overcome the necessary presence of a PET film. applied to the surface of the support. In a preferred embodiment, the support is thus deprived on its upper face of a polymeric film and more generally of any additional layer of material.
• a PET film would be applied, for example to improve the surface state of the seal, it would be by coextrusion and not by bonding as is the case in the prior art. In this case, a step in the manufacturing process would be abolished.
• the subject of the invention is a permanent heat-sealable seal comprising a support associated with a heat-sealable seal on the rim of a receptacle which is characterized in that the support is in the form of an expanded polyester layer.
• the expanded polyester is chosen from the group comprising polyethylene terephthalate and polylactic acid.
• the support is made of expanded PET.
• the expanded PET has a density of between 30 and 500 kg / m 2 , advantageously between 100 and 200 kg / m 2, that is to say a mean density.
• the thickness of the PET foam is between 50 ⁇ m and 4 mm, advantageously between 100 and 300 ⁇ m, preferably of the order of 150 ⁇ m.
• the known joints of the prior art comprise a film applied by bonding to the surface of the support intended to be in contact with the bottom of the cap.
• one of the advantages of PET foam, related to its mechanical characteristics, is to be able to overcome this film.
• said foam has on its face intended to be in contact with the bottom of the stopper, a PET film applied by coextrusion.
• the seal portion of the seal is heat sealable.
• the lid is obtained by combining an upper sheet made of a dielectric material, advantageously aluminum, having a thickness of between 5 and 50 ⁇ m, advantageously between 7 and 40 ⁇ m, and heat-sealing film whose nature is a function of the constituent material of the container.
• a dielectric material advantageously aluminum
• the heat-sealing film is made of a material chosen from the group comprising polyethylene, polypropylene or polyester.
• the aluminum foil and the heat-sealing film are combined by means of a binder such as, for example, an isocyanate-hydroxyl two-component adhesive.
• the aluminum foil is separated from the heat-sealing film by a plastic film, oriented polypropylene, or preferably PET to enhance the joint's non-tearability.
• the plastic film is secured to the heat-sealing film by gluing with a glue of the type, for example two-component isocyanate-hydroxyl glue.
• the lid and the support are associated by means of a permanent binder, for example of the two-component isocyanate-hydroxyl glue type.
• Figure 1 is a sectional diagram of the heat sealable seal of the invention.
• Figure 2 is a sectional view of a second embodiment of the heat seal seal of the invention.
• the sealable seal of the invention has two parts, respectively a support (1) and a heat-sealable seal (2), the seal and the support being joined by means of a permanent adhesive (3) such as a two-component isocyanate adhesive hydroxyl.
• the support according to the invention is in the form of a polyethylene terephthalate foam (4) having a thickness of 150 ⁇ m and a density equal to 150 kg / m 2 .
• the operculum portion is conventionally obtained by combining an aluminum foil (5) with a thickness of 20 ⁇ m and a heat-sealable film (6) of low density polyethylene with a thickness of 40 ⁇ m.
• the aluminum foil and the heat-sealable film are combined by means of a binder (7) in the form of an isocyanate-hydroxyl two-component adhesive.
• the lid has, between the aluminum foil (5) and the heat-sealable film (6), an additional film of polyethylene terephthalate (9) made integral with the heat-sealable film at medium, a binder identical to the previous one.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Laminated Bodies (AREA)
• Closures For Containers (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38779741

Family Applications (1)

Country Status (3)

Families Citing this family (26)

Family Cites Families (2)

• 2007
  • 2007-03-14 FR FR0753832A patent/FR2913672B1/fr active Active
• 2008
  • 2008-03-06 WO PCT/FR2008/050386 patent/WO2008125784A1/fr not_active Ceased
  • 2008-03-06 EP EP08775689A patent/EP2117948A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events