In the paper manufacturing process there is considerable use of fresh water also coming from open basins (river or lake), because of the high quantity used in the initial stages of production we can offer solutions for the reduction of fresh water consumption without affecting the quality of services.

Please visit our website for more information on this topic.

The filters are used in paper mills for the normal recycling and reuse of water, as well as for purifying the water coming from the external basins wells, rivers or basins.

General features and benefits of these installations:

• The application of these filters allows a remarkable recycle in water.
• They help to prevent the accumulation of pollutants (fibers) in the pipes, reducing the possibility of detachment of the material that is formed inside the pipe that is going to clog spray systems or downstream users.
• Significant water savings with obvious benefits in terms of costs and environmental impact.
• The filters are automatically cleaned when the differential pressure gauge detects a partial blockage of the cartridge, or after a set time, allowing fully automatic operation without the intervention of personnel.
• Filtration is mechanical with scrapers or brushes: the counter-washing is only useful to filter disconnected before a canning filter vacuum, so there are no wastes and additional uses of water.
• The filters mounted after the pumps require a positive pressure very low (5-6 m approx.) .
• Low waste water as the cleaning cycle lasts approximately 8 seconds during which only 4-5 seconds for the exhaust valve remains open. This allows you to download only the contents of the cartridge.
• Low pressure drop (0.2-0.3 bar) thanks to the particular shape of the cartridge, also during the cleaning cycle (in time fully open exhaust valve) the loss of flow to the users came in at approximately 25-30 % depending on the supply pressure.

FILTERS APPLICATIONS

• Station pumping fresh water

  Fresh water taken from the environment for the reintegration in the production must always be filtered.
  In times of drought, in the wells remains a considerable amount of sand, while during periods of heavy rain or when there are floods in rivers and reservoirs, there may be stones, sand in large quantities, branches, weeds, leaves etc.. that dirty blocked canvas, felt, pipes, pumps, nozzles.
  The filters used for this purpose have a filter factor, which varies between 50 and microns, depending on the type of pollutant in question, and the purpose for which the water is used.

• Filtration white water

  The most widespread application of paper filters is dedicated to the recirculation of water coming from the sub-machine

• Others filtrations in production cycle

• Application for chemical and paper supplies

  The application of self-cleaning filters for the introduction of water and chemical products in the production cycles have led to a considerable improvement in the quality of the finished product as well as a greater ease of application

STATIC FILTERS FOR PAPER MILL

In some cases the coarser filtration (for example 600 microns) is carried out on a large amount of recycled water with a large-capacity self-cleaning filter.
With some static filters that are added upstream of the users (for example, upstream of spray pipes with small diameter nozzles), filtration is perfected only where necessary.
This type of application turns out to be cheaper.

STATIC FILTERS YMS

The filters are positioned to serve low-pressure spray showers in a process of recycling water (cleaning felt).

ALSF STATIC FILTER

The static filters of the ALSF series (in aluminum) and ASF (in AISI 316) are positioned just before the spray tube to make further filtration after the automatic filtration.

SPRAY NOZZLES AND SHOWER APPLICATIONS IN PAPER MILLS

In the paper mills a large number of spray nozzles are used, below we give you a brief example of the possible applications.

Tubi fissi senza pulizia interna dotati di ugelli normali o autopulenti

Fixed pipes without internal cleaning equipped with normal or self-cleaning nozzles

Tramite spazzole, con ugelli tipo C7E, C7C ecc.

Fixed pipes with internal cleaning (by brushes, with nozzles type C7E, C7C etc.) Oscillating tubes equipped with linear actuators

Flat Table

The tubes are basically laid out in the following positions (although these may vary for different manufacturers and in relation to plant’s needs):

• Oscillating, needle jet, pressure 10-15 bar on the Dandy Cylinder (for cleaning it). This is the mesh cylinder that compacts and smoothes the surface, as well as applying filigree. This is positioned above the canvas. Here our C7 sprayer nozzles are normally used .
• Oscillating, needle jet, pressure 35-70 bar on the Suction Cylinder (for cleaning it). This is at the end of the canvas, where it pulls and canvas and provides a suction. Here our C7C type nozzles with a ceramic insert can be used, due to the normally high operating pressure.
• Fixed, fan, pressure 2-3 bar, on the canvas head cylinder (at the beginning of the canvas).
• Fixed, fan, pressure 1-2 bar, on the coupling cylinder (above the canvas, the final part on the felt side, where the spray is used for moisturising).
• The nozzles most often used for the tubes referred to above are the C7 for cleaning, with a brush inside the pipe.

STARCH TREATMENT

The starch is used to increase strength and rigidity of the paper.
It also helps to prevent the spread of ink. The starch is made from corn, potatoes and wheat flour, to which are added chemicals (copper sulphate, , oxidants, etc.).. The application is made by two cylinders and the starch is sprayed with a hose spray nozzle in a fan, as our types MC2 and MC3.

Size press

It can treat synthetic glues, anti-mold products or spread a patina on the surface: the patina composed of kaolins (aluminum hydrated silicate) and various carbonates, strongly bonded to each other with starch.

Damp Presses

This is a system that uses a roller press to press the sheet of paper between felt faces (which are also in a ring, like the synthetic canvas). Function: To squeeze out water and compact the sheet of paper.
Various oscillating spray showers with needle jets at pressures of 10 to 25 bar are fitted in this area. (This pressure is often laid down by the felt supplier). These are used for cleaning the felt (each piece of felt has its own). They rinse out fibers and deposits, which is essential in terms of the quality of the paper. These pipes are normally fitted before a suction tank, which is used to take residual water away.
The suction tanks (at the entrance) and some rollers are lubricated by means of fixed low pressure (1-3 bar) sprayer pipes, with very low flow rates.
These are fitted with small diameter fan nozzles. They are used to prevent the felt heating up due to rubbing against a fixed edge or turning around a roller.

If you want to learn more, please visit our website Xuda Filtration.

NOZZLES TIPES FOR PAPER MILLS

NEEDLE JET NOZZLES FOR PAPER MILLS

They are ideal for cleaning felts, wires, fabrics and rolls thanks to the shape of their flow that guarantees high impact performance.
They are usually installed on a tube oscillating at a pressure between 15 and 40 bar for cloth cleaning.
Similar nozzles are used for trimming paper for a possible start after rupture.

FLAT JET NOZZLES FOR PAPER MILLS

Different models of CD3 nozzles are used to wash rolls on which paper slide after drying.

CD4 model is a fix nozzle, flat jet, pressure 5-15 bar, for endpaper pull down in case of broken of paper in felt zone.
It can be used for operations of abatement trim.

The nozzles model MC2 and MC3 are used to wash with clean water in medium to low pressures.
Ideal for use in the paper mills thanks to its compact shape.

FULL CONE NOZZLES FOR PAPER MILLS

Tubes with nozzles for foam abatement can be used in the inflow boxes.

SELF CLEANING NOZZLES

In case of presence of fresh water without filtration, often is used a self cleaning nozzle.
For its cleaning is sufficient reduce pressure (about 1,5 – 2 bar) to avoid the accumulation of dirty inside.
They are available with needle jet for cleaning at high pressure and with flat jet for washing at medium-low pressure or lubrication.

ATOMIZING NOZZLES

Pneumatic atomizers are used for paper dampening. These nozzles are used to lubricate paper edges at the end of production run, to avoid cockle.
They have a good humidification.
Regulation of capacity and nebulization type permit to obtain a spray that can reduce scraps in production.

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Filter Paper: Selection, Industrial Use, Advantages & Types

Filter paper is a semi-permeable paper membrane that is used for the separation of solid particles from liquids or gases. It has good absorption and filtration properties that are helpful in the process of separation. Most of them are made of cotton fibers, which in turn are made of cellulose. Filter paper for different purposes is made in different ways.

Types of Available Chemstock LLC Filters

Chemstock LLC is a lab filter paper supplier that deals with a wide range of filter papers for laboratory and industrial use. Here are the filter papers for lab that we supply:

• Qualitative Filter Papers that include the Standard and the Wet Strengthened format
• Quantitative Filter Papers for Quantitative Analysis, Oil and Grease Testing
• Glass Fiber Filters for TSS & high volume Air Sampling
• Quartz Fiber Filters for Gravimetric calculations & Air Sampling
• Cellulose Extraction Thimbles for Fat Analysis Soxhlet Extractions & crude oil sampling
• MCE Membranes for Microbiological & Environmental Testing
• Microfiltration Membranes Holders
• Syringe Filters for HPLC Sample Preparation

How to make the right selection of Filter paper?

With so many different varieties of Filtering Paper available, selecting the right one becomes necessary. Filter papers for lab used for Qualitative and Quantitative Analysis are different. You need to make the right selection to get the correct results from your filtration process.

Selecting Qualitative Filter Paper Chemistry Lab

The following factors need to be considered for selecting the right Qualitative Filter Paper Chemistry Lab which is used to determine, separate, and identify material:

• Chemical Compatibility- This is a measure of how stable a substance is when mixed with another substance. The Qualitative Filter Paper material should not react with the solvent to be filtered.
• Pore Size- The pore size is the size of the pores of the filtering paper that allows the filtrate to pass through it. Denser the pore, higher is the filter capacity. Based on this, there are 13 different grades of filter paper used for Qualitative Analysis, ranging from 150uM to 320uM thickness.
• Wet Strength- The wet strength is a measure of how well the Qualitative Filter Paper can hold when it is wet. Wet-strengthened Qualitative Filter Paper Chemistry Lab can be used for filtration of strongly acidic or alkaline solutions.
• Filtration Method Used- For basic gravity filtration, cellulose or paper filters are used. For Gravimetric Analyses where ignition is required, glass microfiber filters must be used.
• Filtration Efficiency- This includes the right size and the right amount of particles that can be stopped and retained by the filtering paper. The smaller the fiber diameter is, the higher is the filtration efficiency of the Qualitative Filter Paper medium.

Qualitative Filter Paper Chemistry lab can be supplied as filter paper sheets, rolls, or discs to cover all requirements of the filtration and extraction task.

Selecting the right Quantitative Filter Paper Chemistry Lab

Quantitative Filter Papers are used in applications that determine the quantity of substance included in the test specimen. This filter paper for lab is designed for gravimetric analysis and the preparation of samples for industrial analysis. It is available in three forms –Ashless, Hardened Low Ash, and Hardened Ashless.

These factors determine the selection of Quantitative Filter Paper Chemistry Lab:

• Size of filter paper – If the filtering paper has a large size, its effective area will be large. Due to this it will offer less resistance and can be used for a long time.
• Binder content in the filter material – This affects the filtration process. An open fiber structure of the filter paper for laboratory can be useful for the filtration of coarse and voluminous precipitates, while a tight fiber matrix in the filter paper will be good to capture fine grained precipitates.
• Wet Strength- Quantitative Filter Paper Chemistry Lab should have high wet strength to withstand pressure and vacuum filtration.
• Filtering Techniques- The choice of Quantitative Filter Paper will depend on the type of filtering technique, like, washing or decanting.

Chemstock also supplies Quantitative Filter Paper Chemistry lab as filter paper sheets, rolls, or discs for various filtration and extraction tasks.

Filter Paper Use in Various Industries

• Food & Beverage
• Water Treatment Plants
• Pharmaceutical
• Cosmetics & Fragrance Industry
• Chemical laboratories
• Research & Testing
• Microelectronics & Semi-Conductors
• Industrial Filter Paper

The uniqueness of Chemstock LLC Laboratory Filter Paper

Chemstock lab filter paper supplier specializes in Sterile MCE Membranes for Dispensers as well as a varied range of filter papers for lab. MCE or Mixed Cellulose Esters membranes are general purpose filters. They are used for the microbiological examination of waste or drinking water, food & beverages, and pharmaceuticals.

If you want to learn more, please visit our website Press filter paper supplier.

• The membrane has good rate of recovery.
• It has superior flow rates due to its highly porous nature.
• The paper is pre-sterilized and ready to use.
• Pore sizes of 0.45μm and 0.80μm available
• Available both as White or Black Gridded surface membranes
• Both Single-wrapped and Pleated Band membranes for Laboratory filter paper available
• Pleated band membranes of the filter paper for lab have 100 individually sealed filters in a continuous band.
• Lot Number & Membrane Specifications are printed onthe filter cover
• Convenient and hassle-free handling
• Less contamination risk

Advantages of Chemstock Laboratory Filter Papers

• Complete line of Laboratory Filter Paper products for laboratory applications
• Suitable choice for a wide range of applications
• Accurately controlled pore size distribution
• High strength and flexibility of filter paper for laboratory
• Suitable for diverse application needs
• High Convenience factor as each unit is clearly marked with pore size and membrane material
• High-quality standards in a modern production facility