Stock material or miscellaneous articles – Layer or component removable to expose adhesive
Reexamination Certificate
2001-04-27
2004-04-20
Morris, Terrel (Department: 1771)
Stock material or miscellaneous articles
Layer or component removable to expose adhesive
C428S040100, C428S041700, C428S041800, C428S042300, C428S343000
Reexamination Certificate
active
06723406
ABSTRACT:
The invention relates to a masking tape, especially for covering certain parts when painting cars, as well as to the use of this tape. In particular, masking is provided for medium to large surfaces, which must not come into contact with paint in touch-up work in automobile paint shops.
Such masking tapes or shrouds are known and their use is widespread. Standard materials are, for example, 50 g weight special papers or newsprint, and also folded plastic hoods (approximately 30 &mgr;m thick or 30 g/m
2
) or “endless” sheets from a large roll (2 m wide) as well as “2 in 1” systems as folded polyethylene sheets with adhesive tape, including also polyethylene-coated papers with adhesive tape.
Such masking systems must fulfill especially the following requirements:
Paint Adhesion—After oven drying, the paint must not fall from the masking material onto the fresh paint.
Waste—A small volume of waste is important, since it determines the price of disposal.
Number of Persons—Normally, an automobile is painted by only one person. It should therefore be easy for one person to apply the masking.
Number of Steps—Few steps, which can be carried out quickly, are required.
Material Consumption—An adhesive tape, capable of withstanding the temperatures encountered, is required for applying the masking. The consumption of masking material and adhesive tape should be small.
The previously known masking tapes and the like fulfill these requirements only to a limited extent.
Advantages
Disadvantages
Papers
Optimum paint
Paint bleeds through especially
adhesion even
when applied more heavily in
when paint is
the edge region
applied heavily
Masking must be equipped
in the edge
subsequently with adhesive tape
region
Not dispensed directly on the
Low costs
vehicle. Therefore too much
material is consumed at times,
since sometimes too much or too
little paper is dispensed.
Shrouds
No paint bleeds
Paint adhesion not optimum
through
Relatively expensive
The whole of
High material consumption,
the vehicle is
since the whole automobile must
covered
always be covered
The plastic
Hoods generally are steeped in
shroud
paint. As a result, the
can easily be
automobiles cannot be
incised, in
marshaled in the covered state.
order to ex-
pose the area
to be painted
Endless
See shrouds
See shrouds (exception: material
sheets
consumption, since automobiles
can also be covered partially)
2 in 1 -
Paint does not bleed
Optimum result only when both
Systems
through sheet
products are used (that is, paper
folded sheets
No paint bleed-
in the edge region and sheet for
with
through and
larger surface).
masking tape
adequate adhesion
Both products are always
in the case of
furnished with adhesive tape.
polyethylene-
coated paper
Dispensed at
vehicle
Convenient
Slight
Polyethylene-
Little waste since
Due to the coating (composite)
coated paper
polyethylene film
and the bleaching (white), paper
with
is only 10 &mgr;m
is not environmentally friendly
masking tape
thick
and is expensive.
It was an object of the invention to provide a remedy here and, in particular, to create a masking tape, for which an inexpensive, absorptive or adhesive material can be used, which has, in particular, good adhesion for paint, etc. (paint adhesion).
This objective is accomplished by a masking tape, which is characterized in greater detail in the claims.
With that, the invention combines the very good properties of woven fabric, nonwoven fabric or adhesive sheets with regard to paint adhesion and the very good properties of sheets in relation to reliability against paint bleed-through in a convenient product.
With that, the product consists of three products in one and therefore can be referred to as a “3 in 1” product. The components are masking material with good paint adhesion, adhesive tape with a paper backing and a sheet. As masking material, woven fabric, nonwoven fabric or adhesive films with good paint adhesion are preferred.
Masking material: 20 to 40 cm wide
Sheet: particularly 10 &mgr;m (=10 g/m
2
) pretreated (corona) polyethylene sheet (surface tension approximately 38 dynes), width of sheet, depending on application, between 500 mm and 2000 mm, variable length, usually between 10 and 30 m.
Adhesive tape: approximately 25 mm wide, heat resistant (approximately 80° C.)
Adhesive tape for the car painter (for example, tesa 4309 etc.)
The masking material with good paint adhesion is used to absorb and hold heavier paint application reliably in the edge region of the painting even after oven drying, so that paint cannot drop onto the still soft, freshly painted surface. The sheet is prepared by the corona treatment preferably so that a paint mist is fixed securely. Furthermore, the sheet prevents bleed-through of the paint through the paper onto the painted surface.
Especially materials from ordered or disordered (needled or spun nonwoven) yarn/fibers, such as polyester or cotton with a weight of approximately 50 to 150 g/cm
2
are suitable as woven or nonwoven material.
In particular, there are the following product advantages:
Optimum paint adhesion a) in the critical edge region by the masking material with good paint adhesion and b) on the remaining masked surface by the specially pretreated sheet.
Optimum protection against paint bleed-through by the film.
Appreciably less waste from the thin sheet (approximately a fifth of that from 50 g weight paper).
Handling by only one person, due to the convenient format and the pre-manufactured product.
Optimum material consumption a) in relation to the masking material due to the direct dispensing at the vehicle and b) with respect to the adhesive tape because of the standardized width, such as 25 mm.
Time saved by few working steps (3 in 1).
Product advantages over the “2 in 1” system:
Inexpensive material can be used for the edge region, especially woven or nonwoven material with good absorption for the paint.
Coverage of the edge region and of the large surface in one step.
Adhesive tape is required only once.
REFERENCES:
patent: 4358494 (1982-11-01), Akimoto et al.
patent: 5935669 (1999-08-01), Leeuwenburgh
patent: 6296904 (2001-10-01), Zimmermann
patent: 296 17 896 (1997-01-01), None
patent: 0 953 620 (1999-11-01), None
patent: 0 99 251 (2000-05-01), None
U.S. patent application Publication US 2001/0034173 A1, Zimmermann “Painter's Masking Tape and its use”; Oct. 25, 2001, Copy of Specification from U.S. application Ser. No. 09/431,849, filed Nov. 2, 1999.
Morris Terrel
Norris & McLaughlin & Marcus
Salvatore Lynda M
tesa AG
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