Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1995-05-31
1997-04-22
Johnstone, Adrienne C.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156222, 156224, 156277, 156285, B32B 3108, B32B 3112, B32B 3120
Patent
active
056225822
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a method of forming a composite sheet material and of forming a printed article and to a composite sheet material and a printed article.
The printing of articles such as containers, trays or the like usually requires the article to be formed in a manufacturing operation and for the completed article to then be printed in a separate printing operation either by directly printing on the article or by applying a printed foil or sheet to the article. Other techniques include laminating a plastic sheet with a printed sheet and then in a subsequent operation forming the plastic sheet into an article.
These operations are time consuming and the additional handling and work required adds to the cost of the finished article.
Some attempts have been made to print directly on polyvinyl chloride (PVC) material or other material from which containers are molded, and the results have not been good.
SUMMARY OF THE INVENTION
The object of a first aspect of this invention is to provide a composite sheet material from which articles can be made and a method of forming the composite sheet material.
The invention, in the first aspect, provides a composite sheet material including: printed; material by bringing the first and second webs of plastics material together.
Preferably the first and second web are brought together following extrusion of the second web and while the second web is in a heated condition caused by extrusion so that the heated condition of the second web of plastics material causes the first web of printed plastics material to adhere to the second web of plastics material to thereby form said composite sheet material.
The invention may also be said to reside in a method of forming a composite sheet material including: been printed; adhering the webs together.
Preferably the second web of plastics material is in a heated condition caused by extrusion when brought together with the first web so that the heated condition of the second web of plastics material causes the first web of printed plastics material and the second web of plastics material to adhere together to form the composite sheet material.
Preferably the first and second webs pass between heated rollers to adhere the first and second webs together.
Preferably the first web has a heat activated adhesive applied to it to assist adhesion.
Preferably the method includes the step of coating the printed web with a heat seal lacquer prior to bringing the first and second webs adjacent to one another.
The object of a second aspect of this invention is to provide a method of printing an article which reduces costs and handling required in order to print the article.
The invention may be said to reside in a method of producing a printed article comprising: been printed; formed; of the webs overlies the other of the webs; the webs are deformed to match the contour of the mold, to join the webs together and thereby form the printed article.
Since the two webs are brought adjacent to one another and are joined together during the manufacturing process the completed printed product is effectively formed during molding of the article and therefore handling costs and production costs for producing a printed article are reduced.
Preferably the method includes the steps of coating the printed web with a heat seal lacquer prior to locating the first and second webs in the mold.
Preferably the method also includes the steps of passing the first and second webs through a pair of heated rollers before locating the webs in the mold to cause the heat seal lacquer to become tacky to reduce the risk of wrinkling of the first web as the webs are moved into and through the mold.
Preferably the step of passing the webs through the heated rollers also assists in bringing the webs adjacent to one another with one web overlying the other.
In the preferred embodiment of the invention the molding operation which heats the webs activates the heat seal lacquer and causes the two webs to adhere to one another during the mold
REFERENCES:
patent: 3453165 (1969-07-01), Isbey et al.
patent: 3607519 (1971-09-01), Beyer et al.
patent: 3697369 (1972-10-01), Amberg et al.
Derwent Abstract Accession No. 92809X/50, Classes A93, F08, P73, P78, Q45, DT, A, 2620731 (Forbo-Krommenie BV) 2 Dec. 1976, Abstract.
Derwent Abstract Accession No. 86620A/48, Classes A32, A14, A23, A94, JP, A, 53-121051 (Toppan Printing KK) 23 Oct. 1978, Abstract.
Patent Abstracts of Japan, M-839, p. 5, JP,A, 1-64825 (Denki Kagaku Kogyo K.K.) 10 Mar. 1989, abstract, figure.
Patent Abstracts of Japan, M-620, p. 113, JP;A, 62-70019 (Fukuyama Pearl Shiko K.K.) 31 Mar. 1987, abstract, figure.
Patent Abstracts of Japan, M-1072, p. 56, JP,A, 2-270530 (Mitsubishi Yuka Badische Co Ltd) 5 Nov. 1990, Abstract, figure.
Johnstone Adrienne C.
Viapak Pty Ltd
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