EP1739373A2 - Trockner - Google Patents

Trockner Download PDF

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Publication number
EP1739373A2
EP1739373A2 EP20060425429 EP06425429A EP1739373A2 EP 1739373 A2 EP1739373 A2 EP 1739373A2 EP 20060425429 EP20060425429 EP 20060425429 EP 06425429 A EP06425429 A EP 06425429A EP 1739373 A2 EP1739373 A2 EP 1739373A2
Authority
EP
European Patent Office
Prior art keywords
drier
fabric
belt
heating chamber
moving means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20060425429
Other languages
English (en)
French (fr)
Inventor
Vittorio c/o Valenti Engineering S.r.l. Valenti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valenti Engineering Srl
Original Assignee
Valenti Engineering Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valenti Engineering Srl filed Critical Valenti Engineering Srl
Publication of EP1739373A2 publication Critical patent/EP1739373A2/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/12—Controlling movement, tension or position of material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts

Definitions

  • the present invention relates to a system for drying pieces of fabric during the industrial production cycle.
  • driers i.e. systems for drying the pieces of fabric
  • the pieces of fabric are subjected to treatments, such as washings, which require to be followed by drying.
  • the drying requires to be carried out such as to comply with the characteristics of the fabric and not compromise the quality thereof.
  • Drying systems consist of a heating chamber in which there is a forced circulation of air, which is maintained hot. A part of this air is exhausted, during the drying process, in order to remove the evaporated water and thus keep a constant moisture level within the heating chamber, or to remove the fumes that may develop during the treatment within the heating chamber.
  • the piece of fabric is laid on a series of cross-bars, such that a vertically-arranged loop is formed between each cross-bar and the next one, which extends throughout the height of the heating chamber.
  • the longer pieces of fabric can be also housed in a heating chamber having a considerably small size.
  • the entire length of the piece of fabric can be reached by the hot air stream.
  • the method for using this known system provides that, after the wet piece has been housed on the cross-bars, the heating chamber is closed and the system is started. After a suitable preset time according to the particular conditions of the fabric, the system is stopped, the heating chamber is opened and the piece of fabric is withdrawn and sent to the subsequent steps of the production cycle.
  • the residual stress in the fabric fibers affects its workability in a very negative manner.
  • the fabric Upon changes in the environmental conditions, i.e. humidity and temperature, even after a garment has been made, the fabric will tend to release the residual stress, resulting in the clothing being deformed.
  • the object of the present invention is to provide an industrial drier having such structural and functional characteristics as to overcome said drawbacks cited with reference to the prior art.
  • an industrial drier according to the invention has been generally designated with 1, which is placed on a floor 4.
  • An industrial drier 1 is considered herein below as being arranged as in Fig. 1, i.e. subjected to the gravity force acting towards the floor 4.
  • the drier 1 comprises a heating chamber 100.
  • the heating chamber 100 is arranged intermediate between a first technical chamber 10 and a second technical chamber 20.
  • the drier 1 further comprises adduction means 2 to facilitate the introduction of the piece of fabric 140 within the inlet 21 of the drier 1 and abduction means 3 to facilitate the withdrawal of the piece of fabric 140 from the outlet 31 of the drier 1.
  • the operating core of the present invention is the heating chamber 100, which is provided with an air-conditioning system 110.
  • the drier 1 further comprises a fabric moving system 120 which comprises, in turn, a plurality of conveyor belts 121.
  • a fabric moving system 120 which comprises, in turn, a plurality of conveyor belts 121.
  • Each of the conveyor belts 121 is shaped as a transport belt and comprises a web 122 tensioned by a system having at least two cylinders 123.
  • the conveyor belts 121 are arranged to form a pathway 141 for the piece of fabric 140 which develops along the heating chamber 100 such as to pass several times therethrough.
  • the piece of fabric 140 is arranged along this pathway 141 by resting, along preferably horizontal tracts 142, on the conveyor belts 121 and creating a loop 143 in order to pass from each conveyor belt 121 to the subsequent one.
  • each belt is placed higher than the next one in the pathway 141, such that the piece of fabric 140 creates the joining loop 143 of the pathway 141 simply by gravity.
  • each conveyor belt 121 is placed lower than the next one in the pathway 141.
  • the piece of fabric requires to be initially driven to create the loops 143 against the force of gravity.
  • the pathway 141 develops from the inlet 21 such as described below:
  • the pathway 141 passes through the heating chamber 100 for three times. In other possible embodiments of the invention, the pathway 141 can pass through the heating chamber 100 for a different number of times, such as two or four or five.
  • the inlet 21 and outlet 31 of the drier 1 are on opposite sides of the heating chamber 100.
  • the inlet 21 and outlet 31 of the drier 1 are on the same side of the heating chamber 100.
  • each horizontal tract of the conveyor belt 121 passing through the heating chamber 100 is overhung by another belt 126, which is called the "counter-belt".
  • the counter-belts 126 are provided by the suitable arrangement of the backward tracts of the conveyor belts 121, i.e. their lower surfaces. More particularly, wherever this is feasible, each horizontal tract of a conveyor belt 121 is overhung by the backward tract of the conveyor belt immediately preceding in the pathway 141.
  • this solution cannot be applied to the first conveyor belt 121.b, as this is overhung by the belt 126.a which is only intended to act as a counter-belt. More particularly, in case of Fig. 1, the upper surface of the belt 121.b is overhung by the lower surface of the belt 126.a, the upper surface of the belt 121.c is overhung by the lower surface 126.b of the belt 121.b, and finally, the upper surface of the belt 121.d is overhung by the lower surface 126.c of the belt 121.c.
  • Fig. 1 are also indicated the moving directions of each individual tract of counter-belt. It may also be noted how each tract of conveyor belt and the respective tract of counter-belt which overhangs the same move in the same direction.
  • the tracts of counter-belt 126 are suitable to overhang the corresponding tracts of conveyor belt 121 and maintain a preset distance therefrom, which can be adjusted according to particular requirements.
  • the webs 122 of the belts 121 are preferably made of glass fiber or polyaramid fiber, such as Kevlar ® .
  • the cylinders 123 supporting the webs 122 are preferably arranged within the two technical chambers 10 and 20 that are located immediately outside the heating chamber 100.
  • Each of the cylinders 123 comprises, in fact, moving means 124, which may be subjected to early wear or malfunctioning if they are exposed to the high temperature that develops within the heating chamber 100 when the system is working.
  • Each of the conveyor belts 121 comprises moving means 124, which are self-contained and independent with respect to the moving means 124 of the other conveyor belts 121.
  • the first conveyor belt 121.b comprises moving means 124.b which are self-contained and independent with respect to the moving means 124.c and 124.d of the other conveyor belts 121.c and 121.d.
  • the moving means 124 of a particular conveyor belt 121 also move the relative overhanging counter-belt 126.
  • the moving means 124 are suitable to move the respective conveyor belts 121, typically by causing at least one of the cylinders 123 to rotate, thereby determining the movement of the web 122.
  • the speed of this movement which is typically the rotational speed imposed to the cylinder 123 by the moving means 124, is not even throughout the drying cycle of an individual piece of fabric 140, but it may be changed during the drying cycle.
  • the moving speed of the belt 121 can be changed continuously.
  • the moving means 124 comprise motors 129, e.g. electric, and gear boxes 128.
  • the variation in the moving speed of the conveyor belt 121 can be obtained either by changing the rotational speed of the motor 129 or changing the gear ratios obtained by the gear boxes 128.
  • the moving means 124 also comprise, at the beginning of each of the horizontal tracts 141 in the pathway, a position sensor 130 suitable to localize the loop 143 formed by the running piece of fabric 140 when it rests on the conveyor belt 121.
  • Each of the moving means 124 comprising a position sensor 130, also comprises an operative connection 136 between the position sensor 130 and the motor 129 or the gear box 128.
  • each position sensor 130 is operatively connected to the moving means 124 of the conveyor belt 121 on which the controlled loop 143 is rested.
  • the sensor 130.c is operatively connected to the moving means 124.c of the conveyor belt 121.c,
  • each position sensor 130 is operatively connected to the moving means 124 of the conveyor belt 121 which precedes that on which the controlled loop 143 is rested.
  • the sensor 130.c is operatively connected to the moving means 124.b of the conveyor belt 121.b.
  • the operative connection 136 is provided such that it performs a feedback control of the relative speed of the two belts, according to the location of the loop.
  • a redistribution of the moving speeds of the two conveyor belts 121 is commanded by adjusting the moving means 124.
  • the loop 143 is clearly excessively displaced outwards. This position of the loop 143 indicates that the fabric is locally too loose and tends to be paid out from the conveyor belt 121.b with an excessive speed relative to the speed with which it is moved by the belt 121.c. This condition may have very negative consequences on the quality of the fabric, since it can lead to the formation of a crosswise crease on the fabric.
  • the sensor 130 determines that the position of the loop 143 is excessively displaced outwards, it commands a redistribution of the moving speed of the two belts, such that the speed of the belt on which the loop 143 is rested is increased, or alternatively, such that the speed of the belt on which the loop 143 is formed is decreased.
  • the loop 143 is clearly excessively displaced inwards. This position of the loop 143 indicates that the fabric is locally too tensioned and tends to be paid out from the conveyor belt 121.b at an insufficient speed relative to the speed with which it is moved by the belt 121.c. This condition may lead to very negative consequences on the quality of the fabric, since it generates a tensile stress within the fibers of the fabric.
  • the sensor 130 determines that the position of the loop 143 is excessively displaced inwards, it commands a redistribution of the moving speed of the two belts, such that the speed of the belt on which the loop 143 is rested is decreased, or alternatively, such that the speed of the belt on which the loop 143 is formed is increased.
  • the loop 143 is properly positioned. This position of the loop 143 indicates that the fabric is locally in its ideal state because it is free of any kind of stress.
  • the sensor 130 determines that the position of the loop 143 is correct, it commands that the relative moving speeds of the two belts are maintained unchanged.
  • the senor 130 comprises an array of light emitters 131 and light receivers 132 that are coupled to each other.
  • Each receiver 132 is aligned with an emitter 131 such as to receive the ray of light 133 emitted therefrom when the sensor 130 is operating.
  • An example of arrangement of the emitters 131, receivers 132 and relative suitably oriented rays of light 133 is shown in Fig. 5.
  • the sensor 130 signals that an opaque body is present in the space between the emitter-receiver pair.
  • the senor 130 is provided by arranging the light emitters 131 and the light receivers 132 in an alternating sequence within the operative range 135, which must be controlled by the sensor 130.
  • a first side I of the operative range 135 there are sequentially arranged an emitter 131 followed by a receiver 132, then another emitter 131 and then a receiver 132, and so on.
  • the sequence is reversed, as each emitter 131 placed on the first side I must be matched with a receiver on the second side II and vice versa.
  • the sensor 130 described above with the arrangement of emitters 131 and receivers 132 in an alternating sequence offers great advantages as compared with a similar sensor having all the emitters on the one side and all the receivers on the opposite side.
  • this solution allows doubling the distance between two subsequent receivers 132.
  • the interference problems between the signals of adjacent emitter-receiver pairs are dramatically reduced.
  • These interference problems cause a considerable decrease in the operating characteristics of an array of emitter-receiver pairs as compared with what would be expected from the operative characteristics of an individual isolated pair.
  • the active components (designated with 131' and 132' in Fig. 5) of the emitters 131, as well as the receivers 132 are remotely located from the actual operative range 135.
  • the sensor 130 comprises two optical fibers 134 for each emitter-receiver pair.
  • a first optical fiber is connected to the remote emitter 131' and brings the ray of light 133 produced therefrom to the operative range 135.
  • a second optical fiber is connected to the remote receiver 132' and brings the ray of light 133 produced therefrom to the operative range 135.
  • the remote arrangement of the emitters 131 and receivers 132 allows dramatically reducing the problems connected with the operating temperature at which the sensors 130 have to work.
  • the sensors 130 must work at temperatures even as high as 70-80°C. At these temperatures, the commercially available light emitters and receivers are likely to be subjected to early wear or malfunctioning.
  • the active components 131' and 132' of the emitters 131, and the receivers 132 are arranged in an adjoining environment, in which the temperature is kept quite similar to standard temperatures.
  • the senor 130 is arranged such that each ray of light 133 creates an angle ⁇ with the surface of the loop 143.
  • This arrangement is shown in the schematic plan view of Fig. 5.
  • the fabric can be provided with a virtual thickness equal to its width multiplied by the sine of angle ⁇ .
  • the cylinders 123 also comprise tensioning means 125 and an offset guiding system 126.
  • the tensioning means 125 are suitable to ensure that the web 122 remains in a predetermined tensioned state, independently of the expansion or shrinkage due to the changes in the operating temperature.
  • the offset guiding system 126 is suitable to ensure that, during the operation of the system, the webs 122 are not excessively displaced along the cylinders 123 with the risk of being damaged by rubbing laterally against the side structure, both in the heating chamber 100 and technical chambers 10 and 20 for reversal, tensioning and motorization.
  • the conveyor belts 121 also comprise a vibrator 127 suitable, when required, to provide the web 122 with an oscillation having adjustable vertical direction, amplitude and frequency.
  • the vibrator 127 consists of a motor-driven cylinder 127.a to which rods 127.b are fixed, such as three rods arranged at 120° from each other.
  • the rods 127.b have the same length as the cylinder, which is substantially equal to the width of the web 122.
  • the cylinder 127.a is fixed at a distance from the web 122 that is equal to or slightly greater than its radius, such that when it is rotated, the rods 127.b hit the belt 121.
  • the vibration frequency is adjusted by changing the rotational speed of the cylinder 127.a.
  • the amplitude of the vibration can be reduced by moving the cylinder 127.a away from the belt 121 to a maximum distance at which the rods 127.b effectively touch the web 122 of the belt 121.
  • the air-conditioning system 110 which is known per se, comprises in its simplest embodiment at least one fan 111, at least one heat exchanger 112, at least one system of channels 113 and outlets 114 distributing the hot air in the heating chamber 100 and at least one recycle inlet 115 which recaptures the air from the heating chamber 100.
  • the fan 111 is suitable to ensure the forced circulation of an air stream throughout the system 110 or sub-system 117. Predetermined pressure, speed and flow rate characteristics must be ensured to the air stream being generated and supplied by the fan 111, such as to meet the particular design requirements.
  • the heat exchanger 112 is suitable to provide the air stream with the required amount of heat to maintain the predetermined temperature such as to meet the particular design requirements.
  • the channels 113 and the outlets 114 distribute the hot air and are preferably arranged such that the air is blown through those tracts of the pathway 141 which are comprised within the heating chamber 100 with jets substantially perpendicular to the surface of the conveyor belt 121.
  • the channel 113 and the outlets 114 are arranged such that the air is blown through the tracts of the pathway 141 with counter-posed jets.
  • each tract in the pathway 141 is reached by jets of air 117 that are directed from the top down which tend to press the fabric on the conveyor belt 121.
  • Each tract in the pathway 141 is also reached by jets of air 116 that are directed from the bottom up, which pass through the web 122, and tend to lift the fabric from the conveyor belt 121 and cause the same to come in contact with the counter-belt 126.
  • the jets of air directed downwards 117 and the jets of air directed upwards 116 alternate along each of the tracts of the pathway 141 run by the fabric.
  • the fabric 140 adopts a delicately undulated configuration.
  • the profile of the fabric as outlined in Fig. 6 can be roughly approximated with a sinusoid, the period of which depends on the distance between two subsequent jets of air directed downwards 117 or, similarly, between two subsequent jets of air directed upwards 116.
  • the maximum amplitude of the sinusoid is finally limited by the predetermined distance at which the conveyor belt 121 and counter-belt 126 are arranged.
  • the air-conditioning system 110 must be dimensioned, in a manner known per se, such as to allow the fabric to be perfectly dried along the pathway 141.
  • the industrial drying system according to the present invention overcomes the drawbacks of the prior art.
  • the drier according to the invention operates continuously and does not cause the development of any stress in the fabric.
  • the continuous operation of the drier according to the invention also allows the trailing edge of a first piece of fabric and the leading edge of a second piece of fabric to be stitched to each other, such that both can be dried without interruptions.
  • This solution is particularly useful when the same drying conditions are required by two pieces of fabric, mainly in terms of temperature in the heating chamber.
  • a blank i.e. a fake piece can be interposed, which can travel in the heating chamber during the relatively long transient state.
  • the other drying conditions (such as time of stay in the heating chamber, flow rate, pressure and speed of the air stream) can be more promptly modified.
  • control of the position of the loop formed by the fabric plays the role of an actual control of the tensioning state of the fabric. This control avoids that tensioning conditions may be generated, which are due to discrepancies occurring in the drawing speeds of two subsequent belts.
  • the drier according to the invention also avoids that tensioning conditions may be generated, which are due to the piece of fabric being adhered to the conveyor belt.
  • tensioning conditions may be generated, which are due to the piece of fabric being adhered to the conveyor belt.
  • the web-like belt, the air streams passing through this web and, if required, the vibrator tend to keep the fabric separated from the belt in a continuous manner.
  • This type of dryer can be as effectively used in dry thermal fixing processes for fabrics containing elastomers or Lycra ® .
  • these elastic fabrics can be processed with all the residual stresses due to previous working being released.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Fiber Materials (AREA)
EP20060425429 2005-06-28 2006-06-23 Trockner Withdrawn EP1739373A2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20051217 ITMI20051217A1 (it) 2005-06-28 2005-06-28 Asciugatoio

Publications (1)

Publication Number Publication Date
EP1739373A2 true EP1739373A2 (de) 2007-01-03

Family

ID=36992659

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060425429 Withdrawn EP1739373A2 (de) 2005-06-28 2006-06-23 Trockner

Country Status (2)

Country Link
EP (1) EP1739373A2 (de)
IT (1) ITMI20051217A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104913615A (zh) * 2015-06-10 2015-09-16 长兴宏峰纺织印染有限公司 一种纺织布节能烘干机用烘干装置
CN106662396A (zh) * 2014-07-18 2017-05-10 奥特发德国科技有限公司 处理装置和处理方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106662396A (zh) * 2014-07-18 2017-05-10 奥特发德国科技有限公司 处理装置和处理方法
CN104913615A (zh) * 2015-06-10 2015-09-16 长兴宏峰纺织印染有限公司 一种纺织布节能烘干机用烘干装置

Also Published As

Publication number Publication date
ITMI20051217A1 (it) 2006-12-29

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