avr cover story 03/2019

BRÜCKNER: Innovations in nonwovens

BRÜCKNER already presented its series of thermo process ovens for the nonwovens industry, complemented by the SUPRA-FLOW BA, at the IDEA exhibition in Miami, attracting a very interested audience.

Source: Brückner
With the two thermofusion ovens and the two dryers, supplemented by the POWER-FRAME stenter, which is already firmly established on the market, BRÜCKNER covers an extraordinary range of nonwoven processes, leaving hardly any applications uncovered.

Belt oven for hygienic nonwovens

the new BRÜCKNER SUPRA-FLOW BA belt oven provides nonwovens producers worldwide with the technology to produce extremely high-quality end products. Especially gentle fabric transport of the still unbonded fibers, minimum heat requirements, high flow uniformity and constant temperature distribution over the entire working width are just some of the outstanding properties it offers. The excellent accessibility of the oven chamber ensures high ease of maintenance. Working widths of up to 4600 mm and production speeds of up to 250 m/min are possible.

Typical end products bonded on this high-end thermofusion oven using the air-through principle, include hygienic nonwovens for feminine hygiene, nonwovens for incontinence products and diapers (ADL, topsheet, backsheet) as well as filter nonwovens and special nonwovens.

Double belt oven for high-loft nonwovens

Source: Brückner

BRÜCKNER has achieved a considerable increase in efficiency with the updated version of the SUPRA-FLOW BX double belt oven, which was presented a year ago and is now well established on the market. The oven is suitable for the production of high-loft nonwovens, medium as well as highly compressed fiber boards made of natural, synthetic and/or recycled fibers.

The convective oven system operates according to the air-through principle and can be adapted to the product requirements in terms of temperature, flow rate and flow direction individually for each compartment.

In addition to the oven system, BRÜCKNER also supplies complete discharge combinations consisting of fabric accumulator, cross cutter, longitudinal cutter, edge cutting system and winder in various designs and combinations.

Typical end products include mattresses, duvets, inserts, insulation material, upholstery, cushions, dry and wet wipes, painter sheet covers, automotive components, thermal and acoustic insulation for the construction industry and substrates for floor coverings as well as technical coatings.

Belt dryer for lightweight nonwovens

Source: Brückner
The BRÜCKNER SUPRA-FLOW BE belt dryer is particularly suitable for the gentle drying of binder-bonded lightweight nonwovens. BRÜCKNER supplies complete systems for this dryer, from the foam padder to the cylinder dryer group, the SUPRA-FLOW BE belt dryer, as well as a downstream polishing calender. Lines of this type produce high-quality nonwovens for the medical sector, and this type of dryer is also used in spray bonding lines as a multi-tier framework. Typical products made with this air-through belt oven include abrasive cleaning pads, air laid paper, meat & food pads, surgical table covers, premium paper napkins and feminine hygiene products.

Versatile combi dryer

Source: Brückner

The BRÜCKNER SUPRA-FLOW BH is suitable for use as part of high-speed spunlace lines or in lines for wet-laid nonwovens. This dryer is an ideal alternative to drum dryers. The material is securely fixed, even at high speed, without noticeably reducing the nonwoven volume.

The higher nonwoven volume resulting from this gentle drying process makes it possible to reduce the use of fiber raw materials while maintaining the same nonwoven properties.

In addition to just drying, this type of oven can also be used for thermofusion applications and combination processes thanks to its high temperature and flow uniformity.

Typical products made with this air-through belt oven are dry and moist wipes, moist toilet paper, feminine hygiene products and all other applications which require large quantities of water to be dried gently.

Stenter up to widths of over 7 m

Source: Brückner

The BRÜCKNER power-frame stenter is the heart of the thermal treatment and drying of needle felt, roof membranes, high temperature filters, geotextiles and agro nonwovens. In the field of heat-setting of geo-nonwovens BRÜCKNER has already installed lines with a working width of more than 7 m. The high temperature accuracy of the line and the homogeneous heat transfer from the circulating air to the fabric are also decisive criteria for the choice of the sophisticated split-flow system for applications in this sector. The lines are either integrated into a complete nonwovens line from the opening of the fiber to needling to heat-setting, or are operated as a stand-alone solution in an autonomous line just for heat-setting.

Wide production lines are almost always needed for the production of thermally bonded geo-nonwovens. This reduces unit costs, boosting competitivity, and handling in the final application is more simple. Only two 6.2 m nonwoven rolls (overlapping) need to be laid for a 12 m wide road or railway track, instead of four 3.2 m rolls, and the transport costs are lower because filling of the trucks (13.6 m) or containers can be optimized.

Because PP fibers are usually used as the raw material and these have a very narrow process temperature window, very uniform temperature distribution and air circulation are essential. These requirements can be met very well with the specific characteristics of a BRÜCKNER stenter (countered construction, Venturi mixing system, long mixing lengths, etc.).

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