Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F1/00—Wet end of machines for making continuous webs of paper
  • D21F1/0027—Screen-cloths
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F7/00—Other details of machines for making continuous webs of paper
  • D21F7/08—Felts

Definitions

• the invention relates to a process belt for nonwoven or papermaking.
• Nonwoven or papermaking process belts are used in web forming, nonwoven bonding, and nonwoven finishing and finishing.
• Nonwovens owe their origin to the textile, paper, plastic, and leather industries.
• the ever increasing demand for nonwoven products poses a challenge to the production of raw materials and machinery as well as to producers and processors of nonwovens.
• nonwoven fabric A precise definition of the term nonwoven fabric has been defined by the International Organization for Standardization (ISO 9092, 1988) and the European standard exclusion (EN-29092).
• nonwoven production such as web forming, nonwoven bonding and nonwoven finishing and finishing, are performed either individually or in a continuous process.
• the production of nonwoven materials begins with the planar or voluminous arrangement of the fibers. These can either - depending on the wet or dry technology - either made of staple fiber (packed in bales or sacks) or of filaments (spun or melted polymer granules).
• non-woven fabrics are covered with PES ribbons, double-layered with woven-in seam and edge coating, PES ribbons, single-layer, woven and edge coated, bronze ribbons, smooth, with endless soldering seams and 1 ⁇ 2-twisted cast steel strips with soldered seams and edge welding.
• Especially suitable for drying are 1 ⁇ 2-twisted VA tapes with soldered seams and edge welding.
• the following tapes are preferably used for web formation: PES tapes, smooth weave or 2/1 body, as open as possible, with endless woven seam and edge coating and 1 ⁇ 2 - twisted or smooth VA tapes, as open as possible, with soldered seam and edge weld , Particularly suitable for fixation are 1 ⁇ 2-twisted VA tapes with soldered seams and edge welding, and especially suitable for drying are 1 ⁇ 2-twisted VA tapes, 3-stranded, with soldered seam and edge weld.
• PTFE-coated leno cloths are reinforced with potted seam and adhesive seam for fleece formation
• Edges and duofil tapes used with flat seam and edge coating.
• PTFE-coated leno fabrics with seams and edge coating, duofil tapes, with flat seams and edge coating as well as cam belts with seams and edge coating are used.
• Hot air melting is often combined with a spunbonding process.
• the final consolidation takes place both via a dryer belt in a hot air oven and by circulation over a hot air drum or via a calender roll.
• the most suitable processing belts for web forming are PES tapes, double-layered, with woven-in seam and edge coating, PES tapes, single-ply, with woven seam and edge coating, bronze tapes, smooth, with endless soldered seams, 1 ⁇ 2-twisted cast steel strips, with soldered seams and edge welding.
• For drying preferably 1 ⁇ 2-twisted VA tapes with soldered seam and edge welding are used.
• the invention is therefore based on the object to improve the treatment of nonwoven materials on process belts.
• This object is achieved with a process belt for nonwoven or papermaking having an electrical means for electrically charging the process belt.
• Process belts have either been grounded by the mechanical arrangement or, due to their design and operation during their use, they receive a special uncontrolled charge. In both cases, the loading of the process belt affects the process of nonwoven production. This charge can be tolerated as a disadvantageous technical disadvantage of the system.
• the invention is based on the knowledge to consciously influence the electrical charge of the process band in order to influence the process of nonwoven production.
• the device for electrically charging a process band may consist of measuring and regulating the system-related electrical charge of the band.
• the process belt can be actively charged electrically as desired for the nonwoven manufacturing process. Again, of course, a control or regulation of advantage.
• the device has a grinder.
• the process band can be charged across its entire width, in specific areas transverse to the band stretching or in special areas along the band stretching.
• the device has a conductive roller or conductive rings.
• the process band can be charged locally or over its entire width in a simple manner.
• Non-contact charging of a process band is achieved with a device having induction means. With these induction means, a charge can be generated locally at locations of the process band or in the entire process band according to predetermined requirements.
• Non-contact charging of the process belt can also be carried out by means of corona charging or by means of ionizing bars.
• the device has means for the targeted generation of triboelectric charging.
• natural charging processes can be favored or directed so that the charge is in the desired shape at the desired location.
• the use of triboelectric charging is promoted by the moving belts and the contact and the separation of materials such as roller, belt and fleece.
• an electrical charging process can be achieved by the contact and the separation of two materials, which favors the production of nonwovens.
• the process belt has a conductive plastic.
• Plastics are particularly suitable for holding electric charges and generating them by means of a triboelectric effect.
• the process strip has a metal part and a plastic part.
• the metal part can be provided in particular in the form of wires and / or ropes, while the plastic part is provided in particular in the form of monofilament fibers and / or multifilament fibers. Especially this combination of materials leads to a favorable behavior with regard to the electrical charge.
• a charge that is opposite to the process material can be charged present in the volume.
• the process material is pulled onto the belt. This in turn can promote compaction of the process material and it can be prevented that the process material floats dust-like as thin fibers in space and does not reach the belt.
• the opposite polarity charging also allows a loading of the band in the area of the deflection roller or even on the underside of the belt, since it is no longer necessary for the process material to fall onto the belt due to its weight force.
• the band can also be arranged in a different position from the horizontal position.
• a simple construction of a process band provides that the device has a direct current source.
• This DC power source can be used to charge the tape and is preferably used where a specific charge of the tape is desired.
• the device may comprise an AC power source.
• Another area of application for the electrical charging of the process belt is at the transfer area. It is therefore suggested that the Charging targeted in a transfer area to another band or another part of the plant is generated.
• the transfer can be significantly improved by electrostatic attraction and repulsion forces.
• the object underlying the invention is also achieved with a method for producing paper or nonwoven, wherein a process belt, in particular according to the above-mentioned embodiments, selectively charged electrically.
• the object is achieved by using such a process band to perform a process with complete or local electrical charging of the process band.
• Embodiments of the process tape according to the invention vary depending on the use of the tape in the web formation, nonwoven bonding or fleece equipment and processing.
• at least one process band is completely or even locally according to the predetermined Requirements electrically charged, so that an improvement in the nonwoven production is achieved by the electrostatic forces.
• different bands of different materials can be used and the electrical charge can be applied by triboelectric effects inductively or by sliding contacts on the strip material.

Landscapes

• Paper (AREA)
• Belt Conveyors (AREA)
• Nonwoven Fabrics (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=41461116

Family Applications (1)

Country Status (3)

Cited By (1)

Citations (5)

Family Cites Families (3)

• 2009
  • 2009-08-19 EP EP09010665A patent/EP2157034A1/fr not_active Withdrawn
  • 2009-08-21 CA CA2676304A patent/CA2676304A1/fr not_active Abandoned
  • 2009-08-21 US US12/583,502 patent/US20100043992A1/en not_active Abandoned

Patent Citations (5)

Also Published As

Similar Documents

Legal Events