Coating processes – Solid particles or fibers applied – Localized different areas produced
Patent
1999-04-26
2000-12-26
Parker, Fred J.
Coating processes
Solid particles or fibers applied
Localized different areas produced
427199, 427202, 427204, B05D 112
Patent
active
061655481
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method pertaining to after-treatment, such as printing and varnishing, of packaging material.
The method can be applied to every known kind of packaging material, such as paperboard, paper and plastic, for instance. The construction and properties of these materials are well known. A wide area of use for the packaging material concerned includes packages for storing foodstuffs in solid or liquid form, including such types of goods as chocolate, candy (sweets) and so on. The packaging material is also used for packaging cigarettes, medicines, perfumes, etc.
BACKGROUND ART
It is earlier known, e.g. from the Swedish published specification 469 080 (9103139-3), to add hydrophobic zeolite to different types of packaging materials, including paper and paperboard. The intention with the addition is to prevent the packaging material from smelling, or to reduce smell to the greatest possible extent and/or to prevent the packaged goods from becoming tainted. For instance, with respect to paperboard packaging materials, it has been feared that the paperboard itself contains ill-smelling and/or ill-tasting substances that are transmitted to the packaged goods, which is why hydrophobic zeolite is added to the paperboard during its manufacture or fabrication. It has also been believed that the added zeolite will block ill-smelling and/or ill-tasting substances that are applied to the paperboard in the after-treatment thereof, for instance when various printing inks are applied to the paper-board.
One drawback with adding the hydrophobic zeolite at the formation of the paperboard, i.e. within the paperboard, or with applying the zeolite in the form of a surface coating on the paperboard is that a large quantity is needed in order to achieve a positive effect. Because hydrophobic zeolite is very expensive, treatment of paperboard with zeolite adds greatly to paperboard manufacturing costs.
In addition, comparatively large quantities of volatile organic compounds in printing inks and other treatment agents are applied when offset printing packaging material, for instance. When the packaging material comprises paperboard of the aforedescribed kind, i.e. paperboard that contains hydrophobic zeolite, problems regarding smell and/or taste still arise, since the zeolite present in the paper-board and forming a part thereof is unable to deal with the large quantities of volatile organic compounds that derive from the printing inks and other treatment agents. In order to satisfy the requirements placed by the final consumers of the paperboard, i.e. the packaging companies, with regard to smell and tainting of the packaged products, it is necessary for the printers, primarily those that use the offset method, to air the printed packaging materials over very long periods of time. This results in high costs and logistic problems on the part of the printers.
DISCLOSURE OF THE INVENTION
It will be evident from the aforegoing stated that the method hitherto used to apply hydrophobic zeolite to/in packaging materials, such as paperboard for instance, has not been cost-effective. Despite the large and expensive additions of zeolite that are made, the effect achieved has been much too low in some cases.
The present invention provides a solution to the aforesaid problem and relates to a method pertaining to the after-treatment, such as printing and varnishing, of packaging material, and is characterized in that at least hydrophobic zeolite is added in powder form to the packaging material in conjunction with or immediately after applying printing ink and/or varnish to the packaging material.
The zeolite used shall have a hydrophobicity that is characterized by a residual butanol content that is lower than 0.6% by weight. The hydrophobicity is determined in accordance with the Residual Butanol Test described in U.K. Patent Specification 2,014.970. According to this the zeolite is activated by heating in air at 300.degree. C. for sixteen hours. Ten parts by weight of the thus activate
REFERENCES:
patent: 4946372 (1990-08-01), Avni
patent: 5425972 (1995-06-01), Calvert
patent: 5603997 (1997-02-01), Lindgren et al.
Dialog Information Services, File 347, Japio database, Accession No. 03003645, Asahi Chem Ind Co Ltd: "Film for Keeping Freshness of Garden Stuff and Cut Flower"; & JP, A, 01-301245, 891205 Dec. 1989.
Dialog Information Services, File 347, Japio database, Accession No. 03404747, Mitsubishi Alum Co Ltd: "Manufacture of Antibacterial Sheet"; & JP, A, 03-067647, 910322 Mar. 1991.
International Search Report.
Holmen AB
Parker Fred J.
LandOfFree
Method relating to after-treatment of packaging material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method relating to after-treatment of packaging material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method relating to after-treatment of packaging material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-992102