Note: Descriptions are shown in the official language in which they were submitted.
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The present invention relates to sealing materials.
In accordance with the present invention, there is
provided a method of sealing around a door or other movable
closing member fitted to an aperture of an installation
having a high operating temperature to prevent gaseous leakage
between the mating surfaces of the movable member and the
aperture which comprises inserting between the mating surfaces
a high temperature putty provided in the form of at least one
strip having an outer skin of coherent material.
More particularly, the invention relates to a method
of sealing around a movable closure member fitted to an
; aperture of an installation to prevent gaseous leakage, said
closure member having an outer face, an inner face, and an
outwardly directed peripheral surface which is generally
convergent in the direction of the inner face, and said
installation having said aperture formed with a mating surface
generally complementary to said peripheral surface said method
comprising applying to the peripheral surface of the closure
member a putty provided in the form of at least one strip having
an outer skin of coherent material, and inserting the closure
member into the aperture thereby compressing the putty in said
skin so that the skin is caused to burst with spreading of the
putty between said surfaces.
The method is of special interest when applied to
coke ovens for sealing around such closures as doors, coal hole
closures and ascension pipe inspection doors. Its effect is
to reduce gaseous leakage thereby leading to increased
efficiency and/or reduced atmospheric pollution~ It may also
be applied to other firing installations for example in the
ceramic, cement and glass industries. In some cases the skin
and contained strip material deform together to fit between
the mating surfaces. In other cases, bringing the mating
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surfaces together causes the skin to burst leaving the p~ltty
to spread between the sur~aces.
Having an outer skin formed of coherent material
renders the putty simple to transport, store and apply, as
well as tending to extend the shelf-life thereof~ Simple
readily available materials may be employed for the outer skin,
conveniently thin-wal.led polyethylene or polyvinyl chloride
tubing of the kind produced by blowing techniques.
Whilst it is preferred to employ, as the coherent
material, an impermeable material which retains moisture,
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a permeable material may be employed and soaked, with its
content of putty, in water preparatory to use.
In many instances, the structure to which the
closure is to be sealed is in a hot condition. Even so, a
relatively low melting thermoplastic material such as poly-
thene can still give good results, retaining its coherence
sufficiently for the purpose if the operation is carried out
quickly. In cases where the tenacity of a thermoplastic skin
i~ insufficient, it may be covered with a temperature-
re~i~tant sheet material, e.g. cotton or jute fabric.
A skin of non-thermoplastic material, e.g.
regenerated cellulose film of the kind known by the trade
name Cellophane, may be employed for cases where a thermo-
plastic material is unsuitable.
It is generally preferred to apply the strip to
the closure member rather than to the door frame or other
opening which the closure member is to seal. Positioning
the strip around the outside of a closure member having an
outwardly directed face for mating with the face of the
aperture gives a r~asonably stable assembly without providing
attachments to secure the strip temporarily to the closure
member. Additionally, the closure member is in many practical
cases, substantially cooler than the structure to which it
is applied.
The tensile strength of the strip may be improved,
if required, by incorporating a tension resistant member
such as a wire or a cord formed from textile fibre within
- the skin. ~hiq arrangement improves the hot-handling
~ properties of the material and can be advantageous when
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the material is applied in heavy suspended lengths. For
application to circular clo~ures, the strip material may be
provided in annular form and, if de~ired, provided with an
internal wire to hold it in its annular configuration.
The choice of a suitable putty depends upon factors
which will be apparent to those skilled in the art. For some
purposes a putty formed simply of clay and sufficient moisture
to facilitate manipulation may be employed. In general it is
preferred to formulate the composition from such materials as
refractory powders, clays, cement and modifying agents such as
detergents and materials which harden by hydration as described
in British Patent Specification 1,161,109. Examples of suitable
putties are as follows:
Weight % Weight %
Example 1 Example 2
Fireclay 55.0 27.5%
Sand 17.5 20.OyO
Water 21.5 22.0%
Portland Cement 0.75 to 3.0
Calcium Chloride CaC12.6H20 1 to 5
Detergent - 0.5%
The sand, which is to be considered optional,
reduce~ sticking and renders the sealing element friable
after use so that it can easily be broken and brushed away
when the mating surfaces are moved apart.
The two putties shown above are readily extruded
and filled into the skin of ~ausage manufacture. The calcium
chloride of Example 1 soften~ the mix
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and retards the hardening thereof and is particularly
suitable for extrudin~ to smàll diameters.
~he following description in which reference is
made to the accompanying drawin~ i9 given by wag of
illustr~tion. In the drawing:
Fi~.l shows a coke oven in vertical longitudinal ¢ross
~ection,
Fig.2 is a plan o~ one end of the oven showing ~ door
thereof open and with a strip of materi~l according to
the invention positioned thereon.
ig.3 is a cross section of part of the door and adjacent
door-j~mb ~fter closing, and
show~ the strip of material in cross ~ection.
The coke oven of Fig.l i8 conventional. It has an
oven chamber 11 with a floor 12 and a roof 13 formed
with charging holes 14. Below the floor 12 i8 a
structure 15 built on foundation 16 with cheakers 17
and flue~ 18. Chsmber 11 is closed by a pair o~ doors
; 20 19 and 20.
Fig. 2 is a plan showi~g door 20 opened as ~ee~ in
the direction of arrow ~ in Fig.l. ~he periphery of
door 20 i8 tapered to fit the four complementary sur~ace~
of the door ~amb. The ~ertical sur~ces are shown at
21 and 22. With tha door open a thin-walled tube of
polyethylene 23 filled with a putty 24 according to
Example 1 or Example 2, and optionally reinforced
, tensionally with an internal wire or cord 25 (Fig.4)
; is fitted across the top of, and around the sides and
bottom 26 of the door. On closing the door, the tube
23 deforms, stretches and bur~ts to provide a filling
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of the putty between the door and the door jamb.
In use, the surfaces of the door jamb and the
periphery of the door become uneven from corrosion and
the deposition of tar and ¢oke-like deposits so that a
gas-tight mating fit of machined mating surfaces is
difficult to maintain~
. . The spaoing between the surfaces, and the thickness
of the tube 23 are exaggerated in Figs. 3 and 4 respectively
: for clarity of illustration.
It iq to be understood that the exampleæ, and the
application of the invention described with reference to
the drawing, are provided for pUrpOSe5 of illustration only
a~d that variou~ depart~res ma~ be made therefrom by
those skilled in the art, alI within the ~pirit and
. ~cope of the invention. . ~ :
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