Classifications

• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D1/00—Cigars; Cigarettes
  • A24D1/02—Cigars; Cigarettes with special covers
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H3/00—Paper or cardboard prepared by adding substances to the pulp or to the formed web on the paper-making machine and by applying substances to finished paper or cardboard (on the paper-making machine), also when the intention is to impregnate at least a part of the paper body

Definitions

• the invention relates to a non-burning wrapper for use with smoking products and methods for producing same.
• a suitable wrapper must, therefore, emit little if any aroma or smoke upon ignition of the cigarette, have the appearance of a conventional cigarette and provide adequate support once the cigarette is lit to contain the fuel source within the cigarette.
• burn control agents it is known in the art to add burn control agents to paper used with smoking products to control burn rate, ash formation and side stream smoke emission. These agents may act to either retard or accelerate the burn rate of the paper.
• burn rate even though burn rate is controlled, paper treated with such burn control agents generally burns unless large amounts of burn control agents are added. This burning produces an unpleasant odor and transforms the cellulose into a non-cellulose ash.
• paper treated with large amounts of burn control agents is transformed by the heat into a cellulose char, and the emission of appreciable odor and smoke is eliminated.
• the char produced is typically a black or an aesthetically unacceptable dark color.
• United States Patent No. 4,453,553 teaches a wrapper treated with a burn retarding compound which produces a light grey or white ash. This wrapper is not acceptable because it burns emitting an odor and forming an ash which does not possess sufficient strength to contain the fuel source within the cigarette.
• the present invention solves the above-described need by providing a non-burning wrapper for use with smoking products according to independent claims 1, 10 and 20 and a method of producing a non- burning wrapper for use with smoking products according to independent claims 11 and 19. Further features and details of the wrapper and the method are evident from the dependent claims, the description and the examples. The claims are inteded to be understood as a first non-limiting approach of defining the invention in general terms.
• the invention provides a method for producing a non-burning cigarette wrapper using a treating solution containing calcium chloride, a reactive size for paper, and a coating solution containing calcium carbonate, potassium silicate and sodium carboxymethylcellulose.
• the invention also provides a method of producing a non-burning cigarette wrapper which does not impart a significant aroma, forms a white or gray char capable of containing the fuel source, provides uniform delivery to the smoker and is less sensitive to differences in heat generated by the fuel source.
• the method of this invention comprises the steps of forming a treating solution consisting essentially of water, calcium chloride and a reactive size for paper; treating both sides of a base paper with the treating solution; drying the thus treated paper; forming a coating solution consisting essentially of water, calcium carbonate, potassium silicate, and sodium carboxymethylcellulose; coating one side of the thus treated paper with the coating solution; and drying the thus treated and coated paper to form a non-burning wrapper for use with smoking products.
• the preferred method of this invention comprises the steps of forming an aqueous treating solution having between 9% and 18% by weight calcium chloride solids and between 0.2% and 2.0% by weight reactive size; treating both sides of a base paper having an untreated permeability of between 200 and 6500 cm/min (determined in accordance with the CORESTA permeability determination method) with the treating solution such that the base paper contains calcium chloride in an amount between 6% and 14% by weight of the treated paper and reactive size for paper in an amount between 0.1% and 1.5% by weight of the treated paper; forming an aqueous coating solution having between 2% and 8% by weight calcium carbonate solids, between 1% and 5% by weight potassium silicate solids, and between 0.3% and 2.5% by weight sodium carboxymethyl cellulose solids; coating one side of the thus treated paper with the coating solution such that the paper contains calcium carbonate in an amount between 3% and 10% by weight of the finished wrapper, potassium silicate in an amount between 2% and 6% by weight of the finished wrapper and sodium carboxymethylcellulose in an amount
• an aspect of the invention is to provide a method for producing a non-burning wrapper for use with smoking products.
• a further aspect is to provide a non-burning wrapper for use with cigarettes which contain a non-tobacco fuel source.
• Yet another aspect of the invention is to provide a non-burning wrapper for cigarettes which does not impart a significant aroma, forms a white or grey char capable of containing the fuel source, provides uniform delivery to the smoker, and is not sensitive to differences in heat generated by the fuel source.
• the method of this invention comprises the following steps. First, an aqueous treating solution is formed having between 9% and 18% by weight calcium chloride solids and between 0.2% and 2.0% by weight reactive size, preferably "Hercon 70" available from Hercules, Inc. of Wilmington, Delaware; next, using conventional saturation methods, such as a size press, the treating solution is applied to both sides of a base paper, the base paper preferably being 100% cellulose paper and having a permeability between 200 and 6500 cm/min as determined in accordance with the CORESTA permeability determination method. The thus treated paper is then dried using a standard drying method.
• an aqueous treating solution is formed having between 9% and 18% by weight calcium chloride solids and between 0.2% and 2.0% by weight reactive size, preferably "Hercon 70" available from Hercules, Inc. of Wilmington, Delaware; next, using conventional saturation methods, such as a size press, the treating solution is applied to both sides of a base paper, the base paper preferably being 100% cellulose paper and having a permeability
• a treated paper containing calcium chloride in an amount between 6% and 14% by weight of the treated paper and reactive size in an amount between 0.1% and 1.5% by weight of the treated paper is formed. These percentages may be determined by wet pick-up or by any standard method for detecting chloride or calcium ions. It is necessary that a homogeneous treating solution is formed, since application of the calcium chloride to the base paper prior to application of the reactive size adversely affects the subsequent step by allowing the reactive size to form a barrier between the calcium chloride and the potassium silicate added in the next step.
• an aqueous coating solution is formed having between 2% and 8% by weight calcium carbonate, preferably "Albacar 5970,” available from Pfizer & Co., Inc. of New York, New York; between 1% and 5% by weight potassium silicate solids, preferably "Kasil #1" available from Philadelphia Quartz Co. of Philadelphia, Pennsylvania; and between 0.3% and 2.5% by weight sodium carboxymethylcellulose solids, an example being "7H3SF” available from Aqualon, a division of Hercules, Inc.
• the coating solution is applied to one side of the above treated base paper.
• a finished wrapper containing calcium carbonate in an amount between 3% and 10% by weight of the finished wrapper, potassium silicate in an amount between 2% and 6% by weight of the finished wrapper, and sodium carboxymethylcellulose in an amount between 0.3% and 1.5% by weight of the finished wrapper is obtained.
• the final step in making a non-burning paper for use with cigarettes is to dry the thus treated and coated treated paper.
• the method of this invention provides a novel cigarette wrapper which does not burn so as to form an ash, but chars, such that it still contains cellulose, to an aesthetically pleasing gray color resembling conventional cigarette ash.
• the cigarette wrapper does not emit noxious or unpleasant odors when lit and provides a char strong enough to hold the fuel source of the cigarette in place.
• Another feature of the present invention is the variable permeability of the wrapper.
• it is important to provide a low permeability wrapper so that during lighting most of the air is pulled through the end of the cigarette at the fuel source. Once the cigarette is lit, however, it is preferable to have paper of higher permeability so that more air is drawn through the wrapper to provide adequate air delivery with each puff.
• the wrapper of the present invention provides this versatility by having a coating which reduces the permeability of the paper from between 30% to 80% for lighting the cigarette. Once the char is formed the coating degrades to provide a char area having approximately the same permeability as the original uncoated wrapper.
• the dried paper was then coated in the following manner.
• An aqueous coating formulation was prepared using the previously described procedure which contains 5.3% calcium carbonate (chalk), 5.3% potassium silicate and 0.5% sodium carboxymethylcellulose.
• the aqueous coating was mixed throughouly and then applied to one side of the calcium chloride containng sheet using a Mayer rod technique. With the use of different volume Mayer rods, the coating weight can be varied. This has a small effect on the final permeability of the finished sheet. The results are shown below.

Applications Claiming Priority (2)

Publications (2)

Family

ID=24221947

Family Applications (1)

Country Status (8)

Cited By (3)

Families Citing this family (3)

Citations (6)

• 1991
  • 1991-05-02 AU AU76346/91A patent/AU638828B2/en not_active Ceased
  • 1991-06-05 CA CA002043909A patent/CA2043909A1/en not_active Abandoned
  • 1991-06-10 ZA ZA914429A patent/ZA914429B/xx unknown
  • 1991-06-21 BR BR919102612A patent/BR9102612A/pt not_active Application Discontinuation
  • 1991-07-17 JP JP3176971A patent/JPH05171599A/ja active Pending
  • 1991-07-19 KR KR1019910012358A patent/KR920002881A/ko not_active Application Discontinuation
  • 1991-07-19 EP EP19910112146 patent/EP0467405A3/en not_active Ceased
  • 1991-07-19 MX MX9100303A patent/MX174326B/es not_active IP Right Cessation

Patent Citations (6)

Also Published As

Similar Documents

Legal Events