Registers – Records – Projections
Patent
1987-12-03
1988-10-04
Pitts, Harold I.
Registers
Records
Projections
235468, 235487, G06K 1906
Patent
active
047757868
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to bar code labels outstanding in heat resistance and chemical resistance.
TECHNICAL FIELD
In recent years, bar codes are widely used for automation of commodity distribution control, stock control, sales control and the like. Various attempts have been made to introduce into a production site a system for performing production control, quality control and the like using this bar code.
Such control system in plants is conducted as follows. A printed bar code paper label is attached to products running on a production line, the bar code is read at each operation location, specific operation is carried out according to the information on working schedules preset in a host computer, and results on production and on inspection obtained according to the information stored in bar codes are transmitted to the host computer in order to accomplish, on a real-time basis, quality control and production control over the entire area of the plant.
However, for example, conventional bar code labels of the paper-based type can not be used at a diffusion procedure in the production of semiconductors at which a product is treated in various corrosive atmospheres at high temperatures of approximately 500.degree. to 1000.degree. C. The same problem arises in various procedures other than the diffusion for semiconductors such as firing of ceramics and glass or porcelain ware. Conventional bar code labels usable at such high temperatures include one prepared by treating an aluminum substrate with Alumite to print a bar code pattern. This bar code label, however, is usable only at about 500.degree. C. or lower and exhibits a poor durability in a highly corrosive atmosphere.
DISCLOSURE OF THE INVENTION
In view of the foregoing prior art problems, we conducted extensive research to obtain bar code labels excellent in high-temperature durability, chemical resistance and other properties. Our research has revealed that a bar code label high in high-temperature durability and chemical resistance can be obtained by forming a bar code from a vitreous material excellent in heat resistance and chemical resistance on a substrate outstanding in heat resistance, chemical resistance and the like such as ceramics, pottery, porcelain enamel-coated metal or the like. Based on this finding, the present invention has been accomplished.
The present invention provides a bar code label comprising a bar code which is made from a vitreous material and which is formed on a substrate made of ceramics, pottery, porcelain enamel-coated metal or the like.
Substrates to be used for the bar code labels of the present invention are required to be outstanding in high-temperature heat resistance, chemical resistance and the like. Suitable examples thereof are porcelain enamel-coated metal comprising a metal having a fired glaze layer, ceramics and pottery. The substrate is usually used in the shape of a plate but is not limited thereto. For example, the substrate may be in the form of flexible cloth or paper made of, e.g. ceramics fibers of alumina or like material. Of these substrates, porcelain enamelcoated metal has further advantages of being resistant to impact and unlikely to readily break.
For formation of a bar code on a substrate, a vitreous material is used in order to produce a pattern excellent in heat resistance, chemical resistance and the like. Useful vitreous materials are not limited only to those in completely amorphous state, but even those incomplete in amorphous form, e.g. those in a sintered state, are usable insofar as they are high in heat resistance, chemical resistance and the like. While vitreous materials having a definite color themselves can be used as they are, transparent vitreous materials may be made usable by dispersing a suitable pigmen therein. Included among such vitreous materials is a reaction product of acidic oxide and basic oxide. Examples of acidic oxide compounds are silicon oxide, boric acid, phosphoric acid and the like. Examples of basic oxide compounds are carb
REFERENCES:
patent: 4230266 (1980-10-01), Juvinall
Harada Akio
Yamano Minoru
Daiken Kagaku Kogyo Kabushiki Kaisha
Pitts Harold I.
LandOfFree
Bar code label does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Bar code label, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bar code label will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2157367