초록 ▼

An ageing indicator compares a closed sachet of one or more closed tubes of a material which is slightly permeable to a fluid contained in the sachet or tube. The rate of permeation of the fluid through the sachet-like assembly tube wall depends upon temperature and time of exposure to that temperat

An ageing indicator compares a closed sachet of one or more closed tubes of a material which is slightly permeable to a fluid contained in the sachet or tube. The rate of permeation of the fluid through the sachet-like assembly tube wall depends upon temperature and time of exposure to that temperature so the quantity of fluid loss is indicative of temperature and time; the ageing capable of then being detected either by measuring a column of the liquid in a tube or by observing the appearance or disappearance of printed indicia in the sachet.

대표청구항 ▼

An ageing indicator intended to be physically associated by affixation or placement or placement with merchandise whose ageing-phenomenon-characteristic and age is and are disired to be evaluated, wherein: the indicator consists of at least one closed envelope which defies a single compartment; in w

An ageing indicator intended to be physically associated by affixation or placement or placement with merchandise whose ageing-phenomenon-characteristic and age is and are disired to be evaluated, wherein: the indicator consists of at least one closed envelope which defies a single compartment; in which said at least one closed envelope in said indicator is constituted of a plastic material of construction that is selected from the Group consisting of: polyethylene; polypropylene; polyvinyl chloride; polymers of acrylonitrile; polymers of ethylene terephthalate; polystyrene; acetate polymers; and elastomers; with said at least one closed envelope being in the form of at least one tube means or sachet of a plastic material of construction as defined in the foregoing; and also wherein it is intended to give only one indication of the ageing of the merchandise to be monitored, this indication consisting of information printed on the indicator; and further with said tube means or sachet being of a closed construction which has two large faces thereon, one of which large faces carries information whilst the other large face through which said information is read is transparent; and at least one opaque fluid product being contained in said at least one envelope, said opaque fluid product being selected from the Group consisting of: water; colored solvents; and opaque emulsions which become transparent on the elimination of a volatile constituent; said opaque fluid product being further capable of migrating to the outside of said at least one envelope in which it is contained and therethrough so as to traverse at least part of the said at least one envelope; said opaque fluid product being still further capable of generating the said migrating fluid; and the migration of fluid occurring as a function of time involved during the migration and the ambient temperature or temperatures affecting said merchandise; whereby the ageing of the associated merchandise can be evaluated by mere sighting of the relevant said information printed and thereupon capable of appearing on the said indicator faces.