Smoking Articles and Smoking Article Packaging
The present invention relates to smoking articles and packaging for smoking articles, for example, cigarettes and cigarette packaging.
Thermochromic substances are substances which change colour when heated. Different thermochromic substances exhibit different colour changes and change colour at different temperatures.
Use of substances which undergo permanent colour change when exposed to heat for the purpose of marking cigarette wrappers is disclosed in GB 2 148 690. This document discloses that cigarettes wrapped in wrappers comprising a heat responsive substance can be contacted with a heated forma before packaging in order to apply decoration such as brand indicia to the wrapper.
EP 409 566 also discloses the use of heat responsive substances in smoking articles. However, in this case the smoking article concerned is an alternative so-called "non- combustible" smoking article. This type of smoking article does not appear to burn down as does a conventional smoking article, although a heat source within the smoking article does produce heat, which heat is used to produce a flavoured aerosol. This reference is concerned with providing thermal indicators spaced along the length of the smoking article. The thermal indicators comprise substances which cause a visible change at a pre-deter ined temperature and can be used to indicate, for example, which section of the smoking
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article is hot or, when the smoking article should be extinguished.
An object of the present invention is to provide an alternative use for thermochromic substances in smoking articles and smoking article packaging.
The present invention provides a smoking article comprising a smoking material rod, which rod comprises a combustion consumable smoking material and a wrapper enwrapping said smoking material, said wrapper comprising a thermochromic substance, said thermochromic substance effecting a colour change of said wrapper when said smoking article is smoked.
The present invention further provides a smoking article comprising a smoking material rod and a filter, said smoking material rod comprising a combustion consumable smoking material and a wrapper enwrapping said smoking material, tipping means serving to interattach said smoking material rod and said filter, said wrapper and/or said tipping means comprising a thermochromic substance, said thermochromic substance effecting a colour change of said wrapper and/or said tipping means when said smoking article is smoked.
The smoking article is preferably a cigarette and the combustion consumable smoking material preferably comprises one or a mixture of the group comprising cut lamina or stem tobacco, reconstituted tobacco sheet or rod, tobacco substitute and expanded tobacco.
The wrapper or tipping means may comprise a plurality of different thermochromic substances. If both the wrapper and
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the tipping means of a smoking article comprise a thermochromic substance, the wrapper may comprise either the same thermochromic substance as or a different thermochromic substance from the tipping means.
The thermochromic substance may be applied to the surface of the wrapper or tipping means. The thermochromic substance may also be incorporated into the paper furnish of the wrapper or tipping means during manufacture.
The thermochromic substance may be applied to the wrapper or tipping means as a solution, for example, in the form of an ink. Alternatively, the thermochromic substance may be applied to the wrapper or tipping means as a laminate layer or a liquid film. Furthermore, microcapsules of a thermochromic substance may be applied to the wrapper or tipping means or to the paper furnish thereof during production.
The thermochromic substance may be applied to the whole of or a portion of the wrapper or tipping means.
The colour change may be a change from one colour to another colour or it may be a change from colourless to coloured or vice versa. Alternatively, the colour change may be a change from a shade of a colour to a lighter or darker shade of that same colour.
If the thermochromic substance is applied to the surface of the wrapper or tipping means, the substance may be applied thereto in a variety of designs. For example, a cigarette may be designed which reveals a message or pattern as the cigarette is smoked.
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Alternatively, a wrapper or tipping means may be provided which gradually changes colour as the smoking article is smoked. For example, a rainbow effect could be created along the length of the smoking article.
The colour change may be temporary or permanent.
The present invention yet further provides a smoking article container, which container comprises a thermochromic substance, said thermochromic substance effecting a colour change of said container when said container is heated to a pre-determined temperature.
Preferably, the smoking article container is made of paper or cardboard.
The term "a smoking article container" includes a smoking article pack, for example a 10 or 20 cigarette pack, and a smoking article container, for example a 200 carton which conventionally holds ten packs of 20 cigarettes.
The container may comprise a plurality of different thermochromic substances. The thermochromic substance may be applied to the whole or a portion of the surface of the container.
The thermochromic substance may also be incorporated into the furnish of the paper or cardboard from which the container is made during production thereof.
The thermochromic substance may be applied to the container as a solution, for example, in the form of an ink. Alternatively, the thermochromic substance may be applied to the container as a laminate layer or a liquid film. In addition, microcapsules of a thermochromic substance may be
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applied to the container or incorporated in the furnish of the paper or cardboard from which the container is made.
The colour change may be temporary or permanent. A change from one colour to another colour or from colourless to coloured or vice versa may be effected. Alternatively, the colour change may be a change from a shade of a colour to a lighter or darker shade of that same colour.
If the thermochromic substance is applied to the container, the substance may be applied thereto in a variety of designs. For example, a marketing copy line may appear on the container when the container is picked up by a person.
The thermochromic substance may be such that it only becomes visible when the container is heated to a temperature which is higher than normal temperatures to which said container is heated during packaging, transport, storage and use. Such a container may be useful for the purpose of anti- counterfeiting.
In order that the present invention may be better understood and more readily put to use, reference will now be made to the following examples.
EXAMPLE 1 A thermochromic substance was incorporated in the paper furnish of a cigarette paper during production thereof. The thus modified cigarette paper was used as a wrapper for a rod of cut tobacco material in the production of a filter-tipped cigarette. The cigarette paper was colourless under normal temperature conditions. When the cigarette was smoked, the
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heat from the burning coal caused the wrapper to turn green along the length thereof. The wrapper closest to the burning coal being a darker shade of green than the wrapper distal the coal. As will be obvious to the skilled artisan, this example could be repeated with a different thermochromic substance in order to effect a different colour change.
EXAMPLE 2 The brand logo of a type of cigarettes was applied to the surface of a cigarette paper at intervals along the length of the paper using a thermochromic substance in the form of an ink. The thus modified cigarette paper was then used to produce both plain and filter-tipped cigarettes. The brand logos were not visible under normal handling temperatures of the cigarette, including manual handling of the cigarette by the consumer. However, when the cigarette was smoked the heat from the burning coal caused the thermochromic substance to change colour and each logo became successively visible along the length of the cigarette as the cigarette was smoked.
EXAMPLE 3 Bands of different thermochromic substances in liquid form were applied to the surface of a cigarette paper. The thermochromic substances were chosen such that each adjacent substance changed to a different colour upon heating. All of the thermochromic substances were colourless at normal handling temperatures of the cigarette paper. The thus
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modified paper was used to produce cigarettes. When the cigarettes were smoked, the heat from the burning coal caused the thermochromic substances to change colour. Thus as the cigarette burned down, different colours successively appeared down the length of the cigarette.
EXAMPLE 4 A cardboard was produced comprising a thermochromic substance in the furnish thereof. The cardboard was used to produce a cigarette pack. When the cigarette pack was picked up by a consumer the thermochromic substance caused the pack to change colour in the region where the hand touched the pack.
EXAMPLE 5 A thermochromic substance in the form of an ink was used to apply a marketing copy line to a conventional cigarette pack. When the cigarette pack was picked up by the smoker, or was indirectly heated, for example by placing the pack in direct sunlight, the marketing copy line became visible on the pack.
EXAMPLE 6 A first thermochromic substance was used to apply a brand logo to the surface of a conventional cigarette pack. A second thermochromic ink was used to apply a marketing device to the same cigarette pack. The first thermochromic substance was chosen such that it was visible under normal
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temperature conditions, say below about 30°C, but became invisible at higher temperatures. The second thermochromic substance was chosen such that it was invisible at normal temperatures but became visible at body temperature, around 34-37°C, or above. Thus when the pack was at a normal temperature the brand logo was visible on the pack, but when the pack was held in the hand, or indirectly heated, the brand logo disappeared and the marketing device appeared.
EXAMPLE 7 A cigarette carton intended to hold multiple packs of cigarettes was produced in accordance with conventional methods. A thermochromic substance was applied to the carton, either when the carton was in the form of a blank or after construction. The thermochromic substance was chosen such that it was not visible at the temperatures to which the carton may be subjected to during transport, storage or use, say up to 50°C, but became visible at unusually high temperatures. Use of such a carton would be useful as an anti-counterfeiting measure.