Stock material or miscellaneous articles – Structurally defined web or sheet – Edge feature
Patent
1995-07-26
1997-12-30
Krynski, William
Stock material or miscellaneous articles
Structurally defined web or sheet
Edge feature
428195, 428213, 4284111, 283 81, B32B 2302
Patent
active
057028028
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to index tab assemblies where the index tabs are integral with index sheets, and are reinforced.
BACKGROUND OF THE INVENTION
When material, including index tabs, are xerographically copied, sometimes plain index sheets are used, and sometimes the index sheets are mounted with reinforcing at the high-wear index tabs area. When plain index sheets are used, there is normally no problem with copying, and relatively good toner adherence is present. However, without reinforcing, the tabs often wear out or are accidentally torn off. When an attempt is made to image xerographically onto index sheets wherein the index tabs are reinforced with a high strength plastic film (e.g. a polyester such as Mylar), the toner often does not adhere to the tabs, and there are often deletions or poor adhesion of the toner printing onto the tabs so that the printing is soon scraped away.
By way of background, it is noted that one conventional technique for adhering the plastic reinforcing to the index sheets involves the use of a heat and pressure adhesive coating (e.g. modified polyolefin) on the plastic sheet material, and subsequent securing of the plastic reinforcing to the index tab of the index sheets, under heat and pressure, with an adhesive coating bonding the plastic reinforced tabs to the heavy paper index sheets at a temperature of about 210.degree. or 220.degree. F.
Another technique for adhering a polyester or other plastic to the index tab is shown in U.S. Pat. No. 5,135,261 which discloses forming index tab indicia separately on a label, and then securing the printed label onto the reinforced index tab by pressure sensitive adhesive. A coating on the label surface permits adhesion of xerographic toner to the label. In some cases, as an alternative, the index sheets may have file indicia pre-printed onto the index tab, and subsequently have the reinforcing applied over the pre-printed tabs. However, this method requires advance planning, and, flexibility in printing new indicia on the index tabs is lost.
Accordingly, a principal object of the present invention is to provide a coating directly on a reinforced index tab, which will not interfere with the securing of the plastic reinforcing to the index sheet, and which will be xerographic toner receptive, and where the resulting printing is resistant to abrasion.
SUMMARY OF THE INVENTION
In accordance with one illustrative embodiment of the invention, a permanent xerographic toner-receptive index assembly includes an index sheet having a reinforced index tab with a high strength plastic film bonded at least to the tab area of the index sheet. The reinforced index tab has a polymer coating thereon, which may be glossy with a glass transition temperature (GTT) at which the polymer becomes less hard and brittle, somewhat below the xerographic toner fusing temperature, whereby the polymer coating forms a strong bond with xerographic toner applied thereto, and the polymer coating with toner applied thereto has a high abrasion resistance, capable of withstanding 100 double passes of an ASTM Gardner scrape adhesion tester with a 500 gram weight applied thereto, without significantly impairing the toner bond to the index tab.
The polymer coating should also retain its integrity up to a temperature of 200.degree. F., or higher, so that, as the high strength reinforcing plastic film is heat laminated to the heavy paper index sheets, the polymer coating does not come off or cause the plastic film to wrap around the rollers used in bonding the film to the index sheets. One high strength plastic film which may be used is polyethylene terephthalate, or "PET", which is a polyester film sold under various trade names and trademarks, including Mylar, for example.
From a production standpoint, it is desirable to apply the toner receptive coating to the high strength plastic film while the film is still in bulk rolls, the stage where a conventional bonding coating such as a modified polyolefin is also applied to the other side of the
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Chandler Philip Bonn
Lee John Howard
Peterson William Edward
Rettker James Palmer
Avery Dennison Corporation
Krynski William
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