US 2005/0087570 A1 · Cartridge nozzle seal opened by internal cartridge pressure

Abstract

An improved multi layered frangible seal is bonded over the interior opening of the dispensing nozzle of a cartridge container of the type used in combination with an application gun providing a leak proof closure that automatically breaks open in a defined configuration when sufficient internal cartridge pressure is brought to bear against the seal. The seal invention is constructed of a first layer of leak proof frangible material that is bonded to an additional layer of material. The additional layer of material contains one or more cut through and/or cut out void configurations that forms a breaking pattern that turns the additional layer into a break and tear template layer. Bonding the template layer to the frangible layer strengthens the surface area of the frangible layer every where except in the area of the breaking pattern by leaving only the frangible layer covering over the cut through and/or cut out void configuration of the template layer. This leaves a weakness in the multi layered seal only in the area of the breaking pattern which forces the seal to automatically break open and tear only in the weaker single frangible layered area of the breaking pattern when bonded over the interior opening of the cartridge nozzle and sufficient pressure is brought to bear against the seal when the cartridge is pressurized by the application gun. The use of a separate layer of material to form the frangible area of the seal provides the ability to control the thickness of the seal material that must break open with the precision necessary to allow the burst pressure of the seal to be precisely regulated. This multi layered construction method produces a closure seal that is strong enough to remain intact when subjected to the pressure created during the filling operation of the cartridge and yet weak enough to automatically break open and dispense the contents at a variable burst pressure that can be precisely set. An uncut area of the breaking pattern keeps the broken open portion of the seal attached to the nozzle preventing any contamination of the dispensed product when the seal breaks open.

Claims17

Dependent claims

The combination comprising:

(A) a cartridge type container used in combination with an application gun for dispensing a volume of flowable material comprised of a hollow cylindrical tube sealed at one end by a wall end that incorporates a hollow exterior dispensing nozzle with an interior opening in its base that incorporates a peripheral interior surface area around said interior opening of said nozzle of said cartridge perpendicular to the bore of said nozzle providing means for bonding an improved frangible seal over said interior opening of said nozzle of said cartridge with an opposite end of said cartridge sealed by a sliding interior piston that pressurizes said cartridge when said piston is advanced by the plunger of said application gun.
(B) an improved multi-layered self opening closure seal for sealing over said interior opening of said nozzle of said cartridge constructed of a first layer of unbroken frangible material that is bonded to an additional layer of material that contains at least one cut through and/or cut out void configuration that forms a breaking pattern that turns said additional layer into a break and tear template layer and that when bonded to said first frangible layer strengthens the surface area of said first frangible layer everywhere except in the area of said breaking pattern by leaving only said first frangible layer covering over said cut through and/or cut out void configuration of said breaking pattern of said additional template layer which leaves a weakness in said multi layered seal only in the area of said breaking pattern which forces said seal to break open and tear only in said weaker single frangible layered area of said breaking pattern allowing said contained flowable material to dispense out through said broken open portion of said seal and said nozzle when said seal is bonded over said interior opening of said nozzle and sufficient internal pressure is brought to bear against said seal by advancing said sliding interior piston of said cartridge with said plunger of said application gun.

An improved leak proof self opening frangible closure seal for sealing over the interior opening of the dispensing nozzle of pressure operated cartridge containers of the type used for storing and dispensing flowable material when used in combination with an application gun comprised of:

(A) a first leak proof frangible layer bonded to an additional strengthening layer that contains at least one cut through and/or cut out void configuration that forms a breaking pattern that turns said strengthening layer into a break and tear template layer.
(B) wherein said bonding means bonding said frangible layer to said template layer includes a voided area that duplicates said cut through and/or cut out void configuration of said breaking pattern.
(C) wherein said cut through and/or cut out void configuration of said breaking pattern of said template layer creates a weakness in said seal only in the area of said breaking pattern by leaving only said first frangible layer covering over said cut through and/or cut out void configuration forming said breaking pattern.
(D) wherein said configuration of said breaking pattern forms at least one connected portion that breaks open while remaining attached to said seal portion remaining attached to the interior base of said nozzle.
(E) wherein said seal is bonded over said interior opening of said nozzle of said cartridge providing a leak proof self opening frangible closure seal only of sufficient strength to remain intact when subjected to the pressure created in said cartridge during the filling of said cartridge with said flowable material;
and
(F) said seal also being of sufficient weakness to break open outwardly inside said nozzle only in the configuration of said breaking pattern thereby allowing the dispensing of said contained flowable material out through said nozzle when sufficient additional pressure is brought to bear against said seal when said cartridge is pressurized by said application gun.
(G) wherein said bonding means bonding said seal over said interior opening of said nozzle includes a voided area that duplicates said cut through and/or cut out void configuration of said breaking pattern.
(H) wherein said frangible layer side of said seal is bonded over said interior opening of said nozzle.
(I) wherein said template layer side of said seal is bonded over said interior opening of said nozzle.
(J) wherein said frangible layer is comprised of at least one layer of the same or different materials wherein said materials include;
metal foil, plastic, polymers, or paper.
(K) wherein said template layer is comprised of at least one layer of the same or different materials wherein said materials include;
metal foil, plastic, polymers, paper, or adhesive.
(L) wherein the bursting pressure of said seal is adjusted by varying the thickness of said frangible layer.
(M) wherein said contained flowable material includes;
sealants, adhesives, lubricants, chemicals, or foodstuffs.

14 more elements

Dependencies are inferred from the claim text.

Cartridge nozzle seal opened by internal cartridge pressure

Life of this patent

Cartridge nozzle seal opened by internal cartridge pressure

Life of this patent

Abstract

Claims17