Filter bonding and filter assembly

Filter bonding and filter assembly– customised system solutions for the filter industry

Pressure, temperature and chemicals subject filter systems to high stresses. That’s why reliable adhesive bonds must meet high quality specifications, both in the production of filter material and in the filter bonding. To address these specifications SM Klebetechnik’s experts offer straightforward, low-maintenance, reasonably priced systems especially designed for processing adhesives and sealants. The individual filter bonding solutions improve filter production efficiency as well as filter function.

SM Klebetechnik effiziente Filterverklebung Maschiene

Filter assembly: Material pre-processing systems

A variety of filter media are used in modern filter production. They include non-woven materials, paper or materials made of nanofibres. We at SM Klebetechnik offer high-performance systems and equipment for the precise bonding of these media:

Non-woven coating with hot melt using the spray method with angle-fibre spray heads for bonding filter media

When coating non-wovens, the spray method can be used to apply reactive adhesives such a PUR or POR, creating a homogeneous, open-pored application pattern. The non-contact spray application in the adhesive process subjects application nozzles to less wear because it keeps them from getting plugged up with non-woven material or other particles.

The enhanced third-generation Angle spray heads enable a maximum amount of filter media to be bonded with minimal adhesive consumption. After several passes (until the desired basis weight is achieved), a cover fleece can be laminated using the same application technique in the final production step, thus completing the composite.

Working in cooperation with SM Coating, we are able to replace and integrate the hot melt system of an existing system or, as a general contractor, develop, produce and commission a complete system worldwide from a single source in accordance with customer specifications. This includes the integration and full automation of all external components required (e.g. big bag station, powder spreader).

Using the customer’s requirements as a basis, we work together to develop the system concept, with a focus on:

Ease of use and good accessibility
Bridging of change times for hot melt barrels and filter media for continuous production
Flexible width adjustment of adhesive dispensing (making it easy to produce media of different widths)
Design of interfaces and integration of purchased components, e.g. traversing FG measurement, extraction, big bag station
Low maintenance requirements thanks to sealing and rinsing concept, even for reactive adhesives (the suitability of the adhesives must be ensured by preliminary tests)
Very high and reproducible accuracy of the application quantity across the width, speed-controlled depending on the machine speed
Minimised material waste, e.g. by returning oversprayed carbon to the system and good start-stop behaviour
Optimisation of the structure of the application pattern via parameters (outlet geometry, spray air volume) and thus improvement of the permeability properties of the product
Tension-controlled winding with winding curve to achieve the largest possible finished roll diameter

Coating system

Production of multi-layer non-wovens by means of thread or strip application

Contactless curtain coating nozzles enable precise strip or thread application for the production of multi-layer non-wovens with high permeability (low differential pressure) and with only a few grams of adhesive per square metre.

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Coated web material

Efficient filter bonding using bead application with hot melt technology

For filter bonding – and especially for processing polyamide hot melt adhesives – bead application with single or double beads and a 2-hole nozzle is used. This technology enables processing temperatures of 210 to 240 °C for the precise and efficient bonding of filters, using high-temperature-resistant components.

Advantages of bead application technology for filter bonding:

Pressure-controlled extruder and pump station ensure uniform glue application (pressure sensors instead of bypass – low maintenance)
Optimal adhesive-friendly application using an extruder instead of conventional tank melting devices
No permanent temperature stress on the adhesive (adhesive protection, no burning of adhesive)
No nozzle clogging, minimal wear and tear and spare parts requirements

GY0211 Extruder with pump station at the extruder outlet

SM Klebetechnik KF1110 Duesenauftragskopf

KF1110 Nozzle application head in high-temperature design, with front-closing module for minimal stringing, prevents adhesive dripping, head body flow-optimised

„Filter joint connection for round air filters“

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Filter bonding: Equipment and systems

For filter bonding, we offer equipment and systems with precise, volume-accurate dosing systems, high repeat accuracy and a high degree of automation:

Filter casting

When casting filters, adhesives or elastomers such as polyurethane are poured into an open mould.

Support bonding

For reliable filter bonding in the frame or housing with precise adherence to distances.

Frame bonding

With width-adjustable application nozzles, frames can be glued in flexible widths – for maximum flexibility.

Frame sealing

The systems enable the processing of highly viscous sealants at up to 200 °C.

Have we got you interested?

You are looking for an individual and reliable filter bonding solution?
Phone us on +49 (0) 24 52 / 91 72-0 or email us at info@sm-klebetechnik.de – we will be happy to advise you!

About SM Klebetechnik

For more than 30 years, SM Klebetechnik has made a name for itself internationally in the development and construction of special machines and standard devices for processing adhesives and sealants.

Our machines for hot melt processing and coating tasks are used successfully in the automotive, mechanical engineering, graphic arts and adhesive tape industries, as well as in the furniture, construction, wood and textile industries. Our units are also integrated into production systems at adhesive and sealant manufacturers and compounders. In our certified, owner-managed company, over 70 employees are committed to the needs of our customers every day.