Paper chemicals

The Paper Chemicals team of KLK Kolb's has extensive knowledge and expertise. We can offer our customers the benefit of decades of experience in the manufacture and use of process chemicals for the paper and pulp industries. Our solutions are not just "run-of-the-mill recipes." They are designed with precision to suit particular production processes in demanding areas, such as deposit control, machine clothing optimisation, foam and air control, preservation, odour control, deinking and specialities.

KLK Kolb solutions consistently offer customers the best opportunities to tackle the challenges of the coming years within the paper and board manufacturing. We look forward to discussing these with you. You will see that we have a lot to offer you.

Our products and their applications

One of our strengths here at KLK Kolb is our extensive experience in the production and formulation of process chemicals for paper and board manufacturing. This enables us to anticipate change and react to it immediately, whether this relates to the raw material situation or legal requirements, such as the FDA, BfR, Nordic Swan, European Detergents Regulation or the Biocidal Products Directive, to name but a few. We are also in a position to develop a steady stream of new products and improve those that already exist, thanks to our pilot plants and application tests in the laboratory.

Use biocides safely. Always read the label and product information before use.

Support at every manufacturing step

Our consistent focus on solutions for the entire manufacturing process offers a guarantee that we always take the whole process into consideration, enabling us to offer our customers the optimum combination of applications. This is one of the reasons why many well-known paper manufacturers have come to rely on our meticulous working style over the years.

Our services

From advice to implementation

Knowledge and experience are not all that's needed to understand a system and implement the right solution. Specific measurements also have to be carried out on-site and in-depth laboratory analyses may be necessary. These ensure that we have all the important parameters that are needed to achieve the optimum solution, to define the appropriate product to use and to establish the correct position and interval at which it should be added.

Control, trouble-shooting and optimisation

Just implementing a solution is not enough. It must also be monitored and controlled according to clearly defined rules. This ensures that any deviations from the required state are detected and corrective action can be taken. When unexpected variations occur in the system, it is crucial to have knowledge of the measured parameters and their interpretation in order to be able to control the solution being used. When major changes in the system are planned, it is usually necessary to make adjustments and improvements to the new conditions.

Our range of measuring instruments and methods

We make use of a wide range of measuring instruments and proven methods of measurement, both on-site and in the laboratory. For those who are interested in the details: our laboratory equipment includes NMR, GC-MS, FTIR, HPLC and SEM with EDX.

Our online devices for measuring deposit layer thicknesses (the patented BDC) and free and bound gases (KLG) have proven essential aids on-site in helping to achieve informative results.

The secret of our success is the combination of these measuring instruments and the knowledge and expertise within our experienced team of salespeople, service technicians, application engineers, laboratory workers and project and product managers.

Let's get in touch!

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    Deposit control

    We approach problems systematically

    Prevention, reduction, monitoring and control. We offer every customer their individual plan for a targeted system managemen. We treat the problem areas with cleaning agents, conditioners, incrustation inhibitors (anti-scaling), dispersing agents and biocides - always with a view to achieving effective paper machine hygiene and optimum deposit control.


    • Microbiological control, including clear filtrate, cooling water, fresh and spray bar water
    • Foam cleaning of tanks, filters, and frames
    • System boil out
    • Deposit dispersing and scale control

    Analysis, advice and an assured service

    • Analysing circuits and identifying problems with deposit analysis (NMR, GC-MS, FTIR, SEM, Microscopy)
    • Identifying bacteria (modern DNA/RNA technology)
    • Identifying suitable products in our laboratory
    • Monitoring the effectiveness of products with continous monitoring of deposit dynamics (BDC)
    • Equipment maintenance and dosing quantity checks
    • Continuous improvements and troubleshooting


    our new solution for deposit control

    SURFOX is the effective combination of an oxidative biocide, KLK Kolb dispersant Natudisp, and KLK Kolb deposit sensor BDC:

    • The cleaning properties of the dispersant reduce deposits and delay the build-up of biofilm.
    • With our BDC sensor we monitor on-line and in-situ the real processes on the system surfaces and through an early warning system we can react in time with corrective measures
    • The oxidative biocides, like our Mucosin-BX or Mucosin-EX, are known as a very effective and fast reacting biocide compared to common alternatives
    • SURFOX features safetyefficiency and environmental friendliness, which are key topics in the modern paper making industry

    Our products

    • Mucosin™ — Oxidative and classic Biocides, and Stabilisers

      Formulations for efficient slime treatment and controlling odour and fresh water quality

    • Natudisp™ — Deposit dispersants

      Biocide-free technology specifically developed to control deposits in paper

    • Alphasolv™ — Foam Cleaners

      Formulations of cleaners providing long lasting and sticking foam with favourable environmental profile

    • Decaren™ — Scale Inhibitors

      Formulations to influence the precipitation and crystal growth of salts

    • Systemit™ — System boil out

      Formulations for a clean system

    Contact Person

    Monika Bunk

    Monika Bunk
    Business Development Manager

    Ask me anything!

    Machine clothing optimisation

    Consistent performance is another important factor in keeping a high quality production process running when it comes to machine clothing. We can develop an individual treatment plan for you extending from the wire and press right through to the dry end that utilises conditioning, continuous cleaning or shut down cleaning depending on your requirements.


    • Cleaning and conditioning of forming fabrics and press felts
    • Conservation of press felts
    • Dandy and suction roll cleaning

    Analysis, advice and service

    • Analysing circuits and identifying problems on-site
    • Analysing press-felt and forming/drying fabrics and cleaning tests in the laboratory to evaluate products
    • Equipment maintenance and dosing wquipment checks
    • Continuous improvements and trouble shooting

    Our products

    Cleaners without solvents

    • Imbelit™

      Ready to use formulations (alkaline or acidic)

    • Imbelan™

      Neutral concentrates

    • Imbonal™

      Strongly alkaline cleaners

    • Imbacin™

      Strongly acid cleaners

    Solvent-containing cleaners

    • Alphasolv™

      Ready to use formulations (alkaline, neutral, or acidic)

    • Imbelit™

      Ready to use formulations (alkaline or neutral)

    Conditioning agents

    • Prolongin™

    Contact Person

    Ruth Warmuth

    Ruth Warmuth
    Product Manager

    Ask me anything!

    Foam and air control

    Along with microbiological control and the targeted use of cleaning and conditioning agents, the control of foam and air production is essential for optimal process control. We know from experience that the paper suspension has a tendency to take up air. This causes "pinholes" and can interfere with dewatering. Our deaerators tackle these problems effectively.

    The closing of water circuits and the use of increasing amounts of chemicals lead to increased formation of surface foam. This can contaminate machine parts or vats and compromise process hygiene. Our experience in hygiene and the control of deposits and foam can help to keep your process optimised.


    • Deareating and dewatering in chemical pulp washer
    • Defoaming and deareation, including deinking reject
    • Foam and air control of coating colour and size press
    • Control of foam in airation tank, defoaming and deareation of settlement tank

    Analysis, consulting, and service

    • Process analysis and defining the measuring points
    • Measuring the air content (on-line or manually)
    • Looking for solutions
    • Mechanical improvements
    • Optimum product and dosing points

    Our products

    Paracum™ — Concentrated products

    • Efficient defoamer (and deaerator)
    • Shelf life > 1 year
    • FDA and/or BfR
    • Wide range of application (stock preparation to effluent palnt)
    • Temperature range: up to 100°C

    Paracum™ — Water-based dispersions

    • High deaeration efficiency
    • Active ingredients conform with FDA and BfR
    • 95% biodegradable
    • Main application area: wet end
    • Temperature range: up to 60°C

    Contact Person

    Ruth Warmuth

    Ruth Warmuth
    Product Manager

    Ask me anything!

    Preservation & odour control

    Our applications include the preservation of starches, fillers, coating colours, retention agents, pulp and mill broke.

    Moreover, odour often presents a problem in the manufacture of paper. This can occur at the machine, in the finished product or the factory environment. We offer innovative solutions to combat both the microbiological causes and the unpleasant odour itself.

    Our Microcid™ preservatives are effective across a broad pH range of pH 3 to 10 against bacteria, fungi and their spores and yeast to prevent odours occurring, changes in pH and viscosity and the greying of pigments.


    • Preservation of stock or broke
    • Preservation of chemical additives, fillers, and coating pigments
    • pH and Redox control, also of circuit water with long dwell time
    • Microbiological odour control 

    Analysis, advice, and service

    • Analysing circuits and identifying problems (also on-site)
    • Identifying suitable products by means of a preservation contamination test in the laboratory
    • Monitoring the on-site effectiveness with microbe counts
    • Monitoring the effectiveness of products on-site by analysing volatile fatty acids or microbe counts of anaerobic & sulphate reducing bacteria
    • Redox potential (also online) and pH
    • Equipment maintenance and dosing quantity checks
    • Regular service reports
    • Regular maintenance of dosing equipment
    • Continuous improvements and troubleshooting

    Our products

    Microcid™ — Preservatives 

    A combination of classic active substances, such as Bronopol, CMIT, MIT or DBNPA.

    Contact Person

    Monika Bunk

    Monika Bunk
    Business Development Manager

    Ask me anything!


    The quality of recycled paper is becoming more and more variable but the product still needs to achieve the desired whiteness. 

    Our products


    Surfactants in liquid form.

    Contact Person

    Ruth Warmuth

    Ruth Warmuth
    Product Manager

    Ask me anything!

    Support at every manufacturing step

    Stock and additive preparation

    In order to maintain the ongoing, uniform quality of a finished product, supplies of fibres, fillers and chemical additives must be of a of a consistent quality. We will be pleased to support you with our experience and innovative products in the following areas, amongst others:

    Foam and air control is needed in very different places, e.g. in the preparation and application of surface starch in a size press, the formulation and application of coating colours, deaerators during chemical pulp washing and in the defoaming of deinking rejects for better pumpability.

    Preservation of starch, fillers, coating colours and retention agents is essential if any undesired deterioration in quality is to be avoided.

    Deinking: whether you need whiteness for newsprint or low-ash content for tissue products, our surfactants, soaps and fatty acids guarantee the excellent removal of printing inks and stable foam for any subsequent flotation.

    Wet-end and dry-end

    Let our extensive experience work for you in the following areas in particular:

    Deposit and odour control: plenty of water, pleasant temperatures and abundant nutrition - a true paradise for microorganisms. We'll get to the root of the problem. From the results of targeted analyses on-site you will receive a treatment plan including biocides, deposit dispersants and system cleaners that has been tailored to suit your particular production cycle.

    Machine clothing optimisation: consistent performance is another important factor in a high quality production process when it comes to machine clothing. In order to keep everything running smoothly, we can develop an individual treatment plan for you taking the whole process into consideration, from the wire and press right through to the dry end with conditioning, continuous cleaning or shut down cleaning, depending on your requirements.

    Foam and air control: it is known that stock suspensions and white water have a tendency to trap air. Some of the negative consequences include foam formation and the associated deterioration in operating hygiene, pinholes in the paper and inadequate dewatering. Our defoamers and deaerators tackle these problems effectively.

    Process water treatment and effluent plant

    Water is increasingly becoming a limited resource. Constant efforts are therefore being made by paper and board producers to reduce the need for fresh water even further. The water from all stages of production is passed through a series of filtering and purifying steps and then fed back into the process again whenever possible (and depending on specifications).

    However, deposits and microbial contamination of the various forms of process water often causes problems. You can also rely on our extensive experience in this area. We can support you with our expertise in the deposit control of process waters.

    In order to keep the process clean, it is essential for the incoming fresh water to undergo microbiological treatment. Any microbes present at this stage act as a perfect trigger for contamination or slime formation in later stages of the process, e.g. in spray bars or in additive preparation as a result of any dilution with contaminated water.

    This applies to any points in the process at which fresh water can be replaced either with clear or super-clear filtrate or with recycled water from an integrated purification plant. Microbiological control improves the hygiene of the paper machine but it is also important in the treatment of cooling water, for example. Microbial growth here can result in slime formation, calcium deposits and corrosion which, in turn, lead to poor heat transfer and increased maintenance costs. Ongoing treatment against calcium deposits is also needed in sealing water for vacuum pumps, for example, to ensure that they can operate at maximum efficiency.

    Effluent plant

    Foam in an aeration tank leads to less air for microorganisms and lower efficiency as a result. On the other hand, too much air in the settling tank leads to flotation and the risk of foam reaching the receiving water course. Our defoaming and deaerating agents can combat this. Odour formation during fibre recovery, in white water or sludge treatment is also unwelcome. Our biocides offer a remedy for this.