Note: Descriptions are shown in the official language in which they were submitted.
la4~ss
This invention relates to a primer sheet for
plastering, adapted to be mounted between a wall surface and
a coating material.
When a wall surface of a house or building is
plastered, for example, mortar-plastered, a metal lath, wire
lath etc. and a building paper are usually used between the
wall surface and mortar to be plastered, so that mortar as a
coating material is firmly stuck to the wall surface. The
lath is used for firmly holding the mortar on the wall
1~ surface, while the building paper is used to prevent wall
corrosion caused by water present in the mortar or water
that has reached the wall surface from outside through the
mortar layer. Where such lath and building paper are used,
the coating material such as mortar etc. is deformed by a
lS force resulting from temperature variation and external
- force or a force resulting from the aging of the house or
building, resulting in the cracking, separation etc. of the
coating material as well as the breakage of the building
paper. The cracking, separation etc. of the coating materials
are caused by a force applied directly to the coating
material without being absorbed by members other than the
coating material. Since the lath used between the wall
I ~ surface and the coating layer is not sufficiently pliable,
t `' the above-mentioned force is applied directly to the
t . 25 coating layer without being absorbed by a bonding sheet,
thereby resulting in damage to the coating layer.
` This invention seeks to provide a primer sheet for
pla~tering, adapted to be mounted between a wall surface and
a coating material so as to prevent any damage, such as a
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crack or separation, which might otherwise occur in the
coating layer.
Accordingly the invention is a primer sheet for
plastering, formed by fastening a non-woven sheet made of
pliable synthetic resin fibers or a paper-like non-woven
fiber made of mineral fibers to a bonding sheet made of a
water-impermeable, plastic high molecular weight compound
having high tackiness through the utilization of the high
tackiness of the bonding sheet.
The primer sheet is fixed to the wall surface of a
house or building through the utilization of the high
tackiness of the bonding sheet and a coating material is
` coated, or sprayed, onto the non-woven sheet side of the
primer sheet to permit the coating material to be firmly
held through the primer sheet. : -
I A force induced in the coating material due to
temperature variation and external force or a force trans-
mitted to the coating material due to the aging of the house `
` or building is absorbed in the bonding sheet through its ~;
defomation and the force applied to the coating material is `~
decreased, thereby preventing damage to the coating material.
Since the bonding sheet is water-proof in nature, no water
~` reaches the wall surface of the building irrespective of any
deformation of the bonding sheet and, consequently, no wall
corrosion takes place.
Embedding a wire mesh in the bonding sheet is
effective in preventing drooping or sagging which might -
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'~ otherwise occur in the bonding sheet due to the nature,
~ shape etc. of the bonding sheet as well as conditions under
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which the bonding sheet is used.
The primer sheet is simple in construction, and
fastening between the bonding sheet and the non-woven sheet
and fixing between the bonding sheet and the wall surface
are very easily effected through the utilization of the high
tackiness of the bonding sheet without using any adhesive.
The primer sheet can be used in applying mortar-plastering,
; scratching finish of stucco, tile facing etc. on the wall
surface of a prefabricated house, but is also effective in
~ermitting the application of a coating material, such a
mortar, on the ground surface of various structures and
ln buildings. Consequently, the primer sheet according to
this invention has a very wide application.
This invention can be more fully understood from
the following detailed description when taken in conjunction
with the accompanying drawings, in which:
Figure 1 is a cross-sectional view of a primer -
sheet according to this invention as used between a wall
sur~ace and a mortar layer;
~igure 2 is a side, cross-sectional view, partly
broken away, showing the primer sheet of Figure 1~ --
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; ; 20 Figure 3 is a perspective, cross-sectional view,
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partly broken away, showing the primer sheet of Figure 2; ~ -
i~ Figure 4 is a cross-sectional view of a wire mesh-
r` embedded primer sheet as used between a wall surface and a
~ortar layer;
Figure 5 is a side, cross-sectional view partly
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broken away, showing the primer sheet of Figure 4; and -~
` Figure 6 is a perspective, cross-sectional view,
partly broken away, showing the primer sheet of Figure 5.
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Figure 1 shows a primer sheet 2 bonded to a sur-
face 11 of a wall 1 of a prefabricated building, the primer
- sheet having mortar layer 5 coated, or sprayed, thereon.
The primer sheet 2 is formed by fastening the bonding sheet
to non-woven sheet 4 as shown in Figures 1 and 2.
A bonding sheet 3 is formed of a water-impermeable,
plastic high molecular weight compound, such as polvbutadiene,
but~,rl rubber etc. having high tackiness, and a non-woven
sheet 4 is formed of a non-woven fabric made of pliable and
strong synthetic fibers, such as polyester, acetate etc.,
capable of firmly holding a coating on the surface or a
paper-like non-woven fiber made of mineral fibers such as
asbestos fiber, rock wool fiber etc. A back surface 41 of
the non-woven sheet 4 is fastened to the front surface 32 of
the bonding sheet 3 at the factory to obtain a primer sheet
,! 15 2, which is shipped to a building site. An exposed back
surface 30 of the bonding sheet 3 is protected by a suitable
means to be described later, so that no foreign matter can
stick to the exposed back surface 31 of the bonding sheet
3. The bonding sheet is securely fixed to a wall surface 11
through the utilization of the high tackiness after removing
the above-mentioned means. Ater completion of this operation,
mortar layer 5 is coated, or sprayed, onto an exposed front
surface 42 of the non-woven sheet 4.
The non-woven .sheet 4 may be fastened to the
bondin~ sheet 3 either at the factory, as mentioned above,
or at the building site. In any case, it it necessary that
the exposed surface of the bonding sheet 3 be protec~ed
during shipment by covering it with, for example thin paper
so that no foreign matter is adhered to the exposed surface -
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of the hondin~ sheet 3.
The ~rimer sheet 2 is fixed to the wall surface 11
and then the mortar layer is coated onto the surface of the
non-woven sheet 4. After such mortar-plastering, the
resultant mortar layer is subject to temperature variation
due to insulation and atmospheric air, and an external force
applied to the mortar layer 5 is imparted through the
~liable non-woven sheet 4 to the bonding sheet 3 to cause
the latter to be deformed through absorption of the external
force. Consequently, any damage, such as a crack, separation
etc., to the mortar layer 5 which might otherwise occur is
prevented. Where the wall 1 of a house or building is
deformed with the lapse of time, a force resulting from the
deformation is immediately transmitted to the bonding sheet
3 to cause the latter to be deformed through the absorption
of the force. As a result, no deformation reaches the
mortar layer 5 and damage to the mortar layer 5 which might
otherwise occur is prevented.
As the bonding sheet 3 is water-impermeable,
irrespective of the above-mentioned deformation, water in
the mortar layer or water that infiltrates through the
mortar layer 5 from outside is shut off by the bonding sheet
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3 and does not reach the wall 1. Consequently, no corrosion
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occurs in the wall 1.
The mortar layer 5 is forced into the porous
, surface of the non-woven sheet 4 formed of a non-woven ;~
fabric made of synthetic or mineral fibers and firmly held
in position. Where the non-woven sheet 4 has many downy or
fuzzy fibers on the surface 42, the fuzzy fibers formed on
30 the surface of the non-woven sheet 4 are entered into the i
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mortar layer 4 and the mortar layer 5 is more firmly held by
the napped, non-woven sheet 4.
~ eferring to ~igures 4 and 6 conjointly, there are
shown a primer sheet 2 having a bonding sheet 3 in which a
mesh 33 is embedded and a mortar-coated primer sheet 2 fixed
to the wall. The mesh 33 is made of metal or synthetic
resin. With this embodiment the primer sheet 2 is used to
prevent drooping or sagging which might occur at a portion
close to a front surface 32 of a meshless bonding sheet 3
n dependent upon the shape, nature etc. of the bonding sheet 3
as well as conditions under which the bonding sheet 3 is
used. In this case, the primer sheet 2 is more securely
mounted to the wall 1 through the utilization of the high
' tackiness of the bonding sheet 3 and by driving nails,
through the primer sheet 2 and the mesh 33, into the wall so
that part of a load is borne b~ the nails.
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