The adjustment of the gap is as following:the thickness of the felt + the thickness of the Teflon® sheet + the thickness of the fabric + 2mm. Teflon® is a DuPont de Nemours registered…
Frequently asked questions
In the past, the woollen fibres helped the felt to absorb better the fats from the hides and the water, this is why mixed felts had always been very popular as sammying felts.Today 100% synthetic…
The new generation of 100% synthetic felts have very good absorption and a much longer life than mixed felts. That's why all new sammying machines with 5 to 8 cylinders are equipped with 100%…
The most important when you need to decide which sammying felt to use is to know how many pressure cylinders has your sammying machine. Sammying machines are built with 2, 3, 5 or more pressure…
The most important when you need to decide which ironing / embossing felt to use is to know the maximum pressure you will apply on your ironing and embossing machine. Through feed embossing machines…
Dollfus & Muller manufactures for years endless ironing felts with special anti static fibers in order to prevent static electricy problems.Ironing tannery machines often have static electricity…
The quality of a satin wrapper is given by its:compositionpermeabilitynumber of picksIndeed, the more picks there are, the more the surface of the satin wrapper is straight and regular. The processed…
The rubber belt is on the first position on the sanforizing machine to give the shrinkage to the fabric or denim, in the compressive unit.
The palmer unit has a long felt carrying the fabric after the shrinkage of it. This felt has 2 purposes :to dry the fabricto give handle to the fabric
The Denim fabric is carrying a lot of chemicals because of its manufacturing process. Also, the Denim is a rush, hard and heavy fabric. So the felt has to be resistant against chemicals and abrasion…
The shrinkage of the knitted fabric is a consequence of the introduction angle of the fabric and of the mechanical compression between the drum (heated cylinder) and the pressure roll. Indeed, the…
The aramid fibres are always located on the TOP surface of the compacting felt which is in contact with the heated drum. So the surface of the felt is in 100% aramid.
The aramid fibres are used on the compacting felts because of their resistance to temperature and steam.
The PTFE sheet is used on a compacting machine to help the introduction of the fabric between the felt and the hot drum. The PTFE sheet is also giving a shining effect.
The PTFE sheet should be changed once there is deterioration on it (fold, crease). These sheets are always in contact with the fabric, if the sheets are damaged, they can also damage the fabric.
The gap is the space between the heated drum and the pressing cylinder.
If the gap is too small, the felt will be compressed between the drum and the tensioning cylinder. The surface will then be quickly damaged and we will have what we call “an orange skin” or “an…
The compaction rate is affected by the overfeed, the PTFE sheet, the steam, the felt and the gap. So the shrinkage of the fabric is affected by each one of these parameters.
Onceyou cannot achieve anymore the requested compacting ratethe top surface of the felt is damaging the fabric such as cracksthe felts have to be changed.
A flexible conveyor is characterised with its construction which is flexible. Indeed, the monofilaments or multifilaments in warp and weft position which are crossing each other are not sealed.…
A rigid conveyor is characterised with its construction which is rigid. These conveyors are woven with glassfibre or Kevlar® and are covered with PTFE which is giving the resistance to these…
Dollfus & Muller is using in its dryer belts in standard PEEK spiral joints because of several reasons:the PEEK is more resistant to breakage than the metallic jointthe PEEK doesn’t absorb the…
All the machines are not working with the same temperature, same speed or same fabrics. That’s why, we have several kinds of conveyors adapted to each kind of process. The composition of the conveyor…
Based on our experience, we have already been faced with :non parallelism of the cylinderslack of roll covering on the guiding cylindera sensor defect (sensors are too far from the felt/conveyor)…
Chemical formula of PPS
Generalities of the PPSDollfus & Muller is using PPS in PPS belts for printing dryer belts. The Phenylen Sulphide (PPS) – Poly (p-phenylene sulphide) is…
NOMEX® / KEVLAR® chemical formula
NOMEX® / KEVLAR® general informationNomex®Nomex® is a brand of high performances synthetic fibres. The Nomex® was the first aramid…
PTFE chemical formula
Generalities of the PTFEDollfus & Muller is manufacturing PTFE coated belts for printing dryers and relax dryers and PTFE sheets which are…
Chemical formula of PEEK
Generalities of the PEEKDollfus & Muller is using in PEEK in PEEK belts for printing dryer belts.The Polyetheretherketone pointed out…
Our felts and conveyors can be stored during few months. The area where they are stored has to be dry. We suggest for our felts to open the parcels and put them on the floor to avoid having creases…
Please confer to our setting instructions which are sent with the felt/belt. If you cannot find it, please contact us.
Our products are warrantied against any manufacturing defect.