Object of the Invention.
The present invention refers to a transporting and suction
belt for industrial drying, ironing and folding machines, of the type of those which
have a flat configuration and whose ends are fastened to each other, said belts
forming a closed loop or endless band for transport of the garments and clothes
to be dried, ironed or folded, over the heating calenders of the machine. In the
invention a method is included additionally for the production of said belt.
Background of the invention.
In industrial drying, ironing and folding machines belts
are used that have the mission of displacing the garments over the heated drums
or calenders and subsequently through the folding areas.
At the present time, these belts are formed in a non-woven
material, made of felt or similar, and they have a plurality of holes, defined in
the belt by stamping or punching techniques. The purpose of these holes is to allow
the application of a suction or depression to the garments or fabrics to be ironed,
assuring their retention on the transporting belts.
The ends of these belts are usually secured by means of
some metallic staples, said belts adopting a closed configuration by way of a loop
or endless band.
These belts have a drawback in their manufacture, consisting
in the need to make holes in the fabric constituting the belt, either by stamping
or by punching, an operation which substantially increases the final price of the
From a functional point of view, these belts made of felt
or similar have the drawback that in their normal use they are subjected to tension,
to the heat released by the heated rollers of the drying-ironing machine and to
humidity, which causes their progressive stretching or lengthening.
This lengthening brings about that the belts, on becoming
slack, slip on the moving transport rollers and work deficiently, it being necessary
to proceed to their replacement in a relatively short time.
Also, as the belts are formed by non-woven fabrics, it
is habitual that they fray and are quickly damaged due to the friction, which increases
their premature ageing and the possibility of breaking.
Description of the invention.
The transporting belt of the present invention has constructional
features intended to simplify its production and provide a high degree of resistance
to tensile forces, to heat and to humidity, extending its useful life and the replacement
time of the same considerably.
This transporting belt is of the type of those which are
secured at their ends by means of staples or another means of coupling, forming
a closed belt in form of a loop or endless band, intended to be mounted in the ironing
machines to carry out the transfer or transport of the articles of clothing to be
dried through the interior of the ironing machine.
In accordance with the invention, this belt is constituted
by a fabric of thermofixed mesh and provided with a nonslip and heat-resistant coating.
Said mesh fabric, is a fabric comprising weft and warp,
which has a plurality of holes defined during the production of said fabric in a
loom or knitting machine.
With this structure of mesh fabric, the warp or longitudinal
strands provide the belt with great tensile strength, which prevents the significant
extension or stretching thereof during the normal operation in drying - ironing
machines, whilst the weft or cross strands give consistency to the belt.
Furthermore, implementing the suction or low pressure holes
during the production of the fabric obviates the later practicing of said holes
by punching or stamping techniques, substantially reducing the manufacturing costs
of the belt.
The fibres that can be used in the warp and the weft are
varied, depending mainly on the working temperature that they have to bear. Thus,
for high temperatures, such as up to 265° C approximately, the most appropriate
fibres can be: aramid or fibreglass fibres.
In turn, when the working temperature is lower, for example
up to 120° C, other materials can be used, such as: cotton, polyester or wool.
The fibres of the weft and of the warp can be single strand
or multiple strand, being obtained thereby a better texture and strength for the
The belt is thermofixed by a coating of nonslip material
which increases the inherent tensile strength of the mesh fabric, the general strength
of the mesh and binds the fibres preventing the belt from fraying.
The belt can be rougher on one face than on the other,
facilitating the grip on the rollers and/or traction sheaves. This extra roughness
can be achieved by the application of the aforementioned coating in a convenient
way to achieve this effect.
Likewise, depending on the working temperature of the machine
for which it is intended, the coating can be formed by diverse materials. For example,
to support working temperatures up to approximately 265° C, the following coating
materials can be used: low-viscosity fluid silicones or solid polymers of silicone
For working temperatures up to 120° C, coating materials
can be used, such as: natural rubbers, synthetic rubbers, acrylic resins, plastic
resins or polymers of several types.
To facilitate the closing of the loop of the belt by means
of staples, it has been foreseen that the weft can have reinforced areas along the
belt, in which areas the concentration of threads or fibres is higher and suction
holes are absent, said areas of reinforcement of the weft being alternated with
clearer areas, where the concentration of threads or fibres of the weft is lower,
the suction or low pressure holes of the fabric being implemented in said clearer
The areas of reinforcement of the weft are especially suitable
for the insertion of the closing staples since they have more body and prevent detachment
of the staples by pulling of the strands or fibres of the weft.
The manufacture of said belt is very straightforward since
Description of the drawings.
- The manufacture of a piece of mesh fabric, with weft and warp, in a loom or
knitting machine, the suction holes being defined in the fabric with the desired
form, size and arrangement, as well as the areas of reinforcement of the weft, said
fabric having the width allowed by the knitting machine,
- the thermofixing of the mesh fabric, by application of a coating of nonslip
and heat-resistant material, this coating or covering being applied by immersion,
by spray, or by means of a squeegee,
- the longitudinal cutting of the piece of thermofixed fabric into portions or
strips of a variable width in accordance with the width of the belt it is desired
- the cross cutting of the thermofixed belt to the desired length, so that the
areas of reinforcement of the weft are at the ends of the belt and,
- the fastening of the opposing ends of the belt, by staples or other conventional
means, to obtain a closed belt or endless band and so that the staples are fixed
in the reinforced areas of the weft.
To complete the description being made and to assist in
a better understanding of the characteristics of the invention, this descriptive
specification is accompanied with a set of drawings wherein, by way of illustration
but not restrictively, the following has been represented:
Preferred embodiment of the invention.
- Figure 1 shows a plan view of a belt fragment, showing the areas in which the
weft is thicker and the areas in which the weft is less thick.
- Figure 2 shows a longitudinal section of the belt shown above.
- Figure 3 shows a detail of the junction of the two ends of the belt by means
of some staples which act on the reinforced areas of the weft.
- Figure 4 shows a schematic view of the successive phases for obtaining the belt
according to the method of the invention.
As can be observed in the figures cited above, the transporting
belt for ironing machines comprises a mesh fabric (1), with warp and weft, obtained
by conventional techniques in a loom or knitting machine and formed from single
or composite strands, in which a plurality of holes (2) are defined of size and
determined density, said mesh fabric (1) being covered and thermofixed by a coating
(3) of nonslip and temperature-resistant material.
The strands constituting the weft (11) and the warp (12)
can be made of: aramid fibre, fibreglass fibre, polyester, wool or cotton among
others, whilst the coating (3) can be silicone, polyurethane, natural or synthetic
rubbers, polymers and others.
In a preferred embodiment the weft (11) has some reinforced
areas (4), with a higher concentration of fibres or threads, alternating with some
clearer areas (5) in which the weft (11) has a lower concentration of threads or
fibres and, jointly with the warp (12) delimits the holes (2). Said holes can come
in diverse forms and arrangements, being obtained in all cases during the manufacture
of the mesh fabric in the knitting machine.
As can be observed in the detail of figure 3, the fastening
of the opposing ends of the belt (1), so that it adopts a closed configuration by
way of an endless band, is carried out by means of some staples (6) which are fastened
in the reinforced areas (4) of the weft (11), corresponding to the opposing ends
of the belt (1), which prevents the staples (6) from tearing the weft (11) of the
ends of the belt, when said belt (1) is subjected to a working tension.
In an alternative embodiment the belt (1) can have on one
of its faces a greater texture or roughness, defined by coating or covering (3),
to increase the frictional force on the transporting rollers of the drying-ironing
machine and preventing it from slipping.
The method of manufacturing the belt (1) in accordance
with the schematic shown in figure 4 comprises the following phases:
- The fabrication of a piece (1a) of mesh fabric, with weft and warp, in a loom
or knitting machine, and with the characteristics shown in figure 1,
- the thermofixing of the piece (1 a) of mesh fabric, by application of a coating
(3) of nonslip and heat-resistant material, by spraying, impregnation or immersion
in said product for coating (3),
- the longitudinal cutting of the fabric piece (1 a), once thermofixed, into portions
or strips (1 b) of the width desired in each case,
- the cross cutting of the strips (1 b) of thermofixed mesh fabric to the desired
length and so that the reinforced areas (4) of the weft are as much as possible
in correspondence with the ends of the belt (1), as is shown in figure 3 and,
- the fastening of the opposing ends of the belt (1), by means of staples (6)
which establish the linkage of the reinforced areas (4) at the ends of the belt
Having sufficiently described the nature of the invention,
as well as a preferred example of embodiment, it is mentioned for the opportune
effects that the materials, form, size and arrangement of the elements described
can be modified, provided it does not signify an alteration to the essential characteristics
of the invention, which are claimed below.