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The spinfinger serves to retain the yarn
Feb 29th
Which is wound around it forming coils, thereby countering the centrifugal force that is the main cause of balloon formation. This problem, typical of ring spinning machines since it derives from their very working principle, is very evident in the case of woollen and semi-worsted ring spinning frames, due to More >
Workplace safety and technical features
Feb 29th
Considerable progress has been made in the area of workplace safety (owing to its structure, the card is, unfortunately, a highly dangerous machine): as a result, the carding units and the sides are now protected and fitted with safety devices. The widespread installation of automatic cleaning devices has made an More >
Mechanical combing in manual
Feb 18th
Three components were used in manual combing: the hand and two combs. The hand acts as a gripping means while the combs process the head and the tail of the tuft. Mechanical combing is carried using linear combing machines which reproduce the actions of hand combing; the comb is still More >
Tandem card General remarks
Feb 18th
The washed, beaten and oiled wool is sent to special carding rooms through a pneumatic system. It remains there for the time necessary to allow a proper distribution of the oiling substance into the fibres and also to meet the specific production schedule. The efficiency of the carding operation strictly More >
Composition of the carding room equipment
Feb 18th
Due to the number of operations carried out and their crucial importance, the carding room equipment is a complex and imposing installation. Its role, basically, is to produce extremely regular rovings at the highest speeds compatible with the process.
The criterion which determines how many cards are used is above all More >
Hand combing method
Feb 6th
To thoroughly understand how combing machines carry out the combing process, it is worth mentioning how wool was manually combed in the past. This process included three main operations and precisely: 1. introduction of the fibre tuft in the comb; 2. combing of the head of the fibre tuft; 3. More >
Spinning–twisting machine
Feb 6th
The twisting of a fancy yarn can also be accomplished using a machine that combines the two processes, ring and hollow spindle. In this case the first operation is carried out by the hollow spindle, preceded by the core and effect yarn feeding group. Below the hollow spindle, which holds More >
How Does Finisher Card
Feb 6th
This card, again entirely provided with needles clothings, is generally made up of a drum preceded by a fly cylinder with a pair of worker-stripper cylinders, and it serves to obtain a sliver that is as highly processed as possible. The purpose of the divider (Figure 1) is to split More >
How does The Breaker Card
Jan 30th
The breaker card, fed, via the conveyor, by the loader, is made up of two drums connected by a conveyor cylinder. The first drum, equipped with a feeder group and a series of working-stripping cylinder pairs, makes up the pre-carding unit, and is entirely wired. It opens further the material More >
Use of Control Devices
Jan 28th
Metal probes, placed on the delivery side of the drying unit, are used for controlling the dried wool moisture content (which must be uniform and predetermined); these probes measure the electrical capacity or resistance fluctuations, which vary according to the quantity of water contained in the fibres. It is however More >
Hollow spindle twisting machine
Jan 28th
In this machine the hollow spindle with the binder yarn is positioned between two pairs of cylinders, while a hook, below the spindle and rotating in the same direction, twists the core and effect yarn (Figure 1).
Fig. 1 Principle of the hollow spindle twisting machine
Given the intermediate position of the More >
Method of Pre-opening
Jan 28th
The bale opener (Figure 1) includes the “To” two-section horizontal conveyor on which the greasy wool bales are loaded; the bales pass from one sector to the following one and are turned upside down and are partially divided into big tufts of wool. The “To” conveyor conveys the fibre mass More >
The carding room equipment
Jan 28th
Carding room equipment can traditionally be broken down into three machines (or sometimes just two, when the raw material requires less intensive treatment) and a number of drums that is determined by the type of processing being carried out. The carding action is repeated a number of times on each More >
Types of Spun Fancy Yarns
Jan 27th
In the preparation stage, it is possible to create two types of fancy yarn: yarns with loose hairs and knop yarns. In the first case, the effect is obtained by adding loose hairs to the blend, giving the yarn a fuzzy appearance and a silky hand. The presence of loose More >
Method of Short Fibre Drafting
Jan 27th
In this case, the rovings are not very cohesive or strong, therefore drafting must necessarily be very reduced (usually carried out at rates of between 20% and 50%) and supported by special fibre control devices. The shorter length of the raw material does not generally allow the fibres to be More >
How do work loader with cunt
Jan 27th
The equipment is fed by a loader, which has to deliver a precise amount of fibre blend in a given unit of time to guarantee accurate and continuous production of the required count. This necessity is the result of the continuity of production, which does not allow, while the machine More >
There are two types of clothing for cards
Jan 27th
The sawtoothlike wire and the flexible clothing. Flexible lothings (Figure 1) have needles embedded in a base strip, made up of layers of felt or flexible material.
Fig. 1 Flexible clothings
Wires (Figure 2) are made up of a steel thread with sharp-edged teeth. This makes them quite wear-resistant. When it comes More >
How is Operation of the card
Jan 26th
The card used in woollen spinning is traditionally the sort with cylinders (covered with clothings that are angled to varying degrees), which rotate at different speeds, effecting the three cardinal actions: carding, stripping and raising. Appropriately combined, these three actions allow opening of the tufts, continuous detachment of the fibres More >
Carding plays a crucial role in all spinning cycles
Jan 26th
Carding fulfils a series of precise objectives, serving:
* to open the blend fibres fully and definitively * to arrange (as far as their length allows) the fibres parallel with one another * to remove impurities * to blend the raw material further * to reduce the blend to a web More >
Automation and safety process
Jan 26th
In an automatic preparation cycle, the only intervention on the part of the operator is to supply the bale plucker with bales, while the prepared material, delivered by the storage boxes, is fed directly to the hoppers that supply the carding room equipment loaders, thereby creating a direct link with More >
Storage and carding room supplying
Jan 26th
Leaving the blending chambers, the fibre can once again be put through the opening machines, or if it needs further homogenisation (this applies particularly if one of the components is present in only a very small proportion), submitted to a second or even third blending and relative picking. Finally, the More >
Process of Plucking with Blending Apron
Jan 26th
Once it has been laid horizontally in layers, the material has to be plucked in the direction perpendicular to that in which it was laid down. This allows optimal blending. This plucking operation is carried out using a fixed or a mobile blending apron. The blending apron is a conveyor More >
Fibre the Blending
Jan 25th
Figer 1 Stratification in the cell without air
Fibre is sent to the blending rooms, where, traditionally, the material is laid down horizontally and carefully broken down into many thin layers, in such a way as to optimise blending with the subsequent vertical plucking. Mobile conveyor belts are often used in More >
Oiling of the fibre blend is fundamentally important
Jan 25th
Fig. 1 Oiling in a rotating tank
Oiling of the fibre blend is fundamentally important, because it increases the coefficient of friction between the fibres (which is particularly low in the case of short fibres). This favours the cohesion of the card web and of the rovings; it also help to More >
Opening Willow the Fibres
Jan 25th
This stage is usually carried out by an opening willow in the case of shorter fibres and by a willow in the case of longer ones. In the opening willow the fibres, evenly and constantly fed to the conveyor, are drawn inside the machine by two licker-in cylinders, which have More >
Removes Tufts and all types of dust and impurities
Jan 25th
From the bale plucker the fibres are pneumatically conveyed to the blowroom, which opens the tufts and removes all types of dust and impurities. The material is fed, via an entry hopper, into the blowroom, in which there operates a cylindrical drum with a diameter of around 600 mm. (the More >
Preliminary plucking and partial blending of the fibres
Jan 25th
The bale plucker is the first machine in the cycle, as it carries out a preliminary plucking and partial blending of the fibres. The bales, which are compressed when they reach the spinning mill, are first removed from their protective wrapping and then placed on the conveyor that feeds the More >
Preparation system based on the number of components (global)
Jan 24th
In this case, preparation involves a series of sequential operations, some of which can be repeated, perhaps several times, according to the characteristics of the materials and the level of quality required. As a result it is a more sophisticated and complex process than the previous one, but also more More >
Preparation system based on the number of components (instant)
Jan 24th
A series of bale pluckers – their number corresponds to the number of components to be blended – that are also equipped with weighing devices work parallel with one another, unloading the required proportion of each of the various types of fibre on to a transverse vertical apron (Figure 1).
Fig. More >Robotised cell for automatic package handling
Jan 24th
This technology is based on the use of anthropomorphic robots equipped with special tools and designed specifically for handling packages. The robot is part of a fully integrated system that incorporates a series of machines and special devices. The main advantage offered by this solution derives from the robot’s multi-purposeness More >
Package unloading, transportation and packing
Jan 24th
The most recent yarn package handling and packing systems allow applications specifically developed both for open-end spinning and for winding. In the first case, systems _ of varying degrees of sophistication _ have been developed for the “intelligent” management of open-end spinning machines.
These systems are based on the concept of More >
winding-off machine
Jan 24th
There is one particular type of winding machine that is called a winding-off machine. It is fed by skeins that have just come from the dyeing process and it produces packages. The winding-off head is basically the same as that of a normal winding machine, while a special system is More >
Singeing is an operation carried
Jan 23rd
Singeing is an operation carried out in order to eliminate yarn hairiness. The singeing system consists of a package-to-package winder and a gas burner. The yarn is passed through the flame, which singes the protruding fibres that cause the hairiness. It runs at a rate of 400 to 1000 m/min. More >
Waxing serves to lubricate the yarn
Jan 23rd
Waxing serves to lubricate the yarn, reducing to a minimum its coefficient of friction with the parts with which it comes into contact. This operation is normally carried out on yarns destined to be processed on knitwear machines, on which smooth running of yarns is essential. Waxing is carried out More >
Retraction winding machine for bulky yarn production
Jan 23rd
This machine is equipped to carry out, in continuous mode, the shrinking of acrylic yarns and HB, also containing elastane, and the production of bulky yarns (blended and pre-dyed). It has a maximum winding speed of 1000 m. per minute and a shrinking field of 0-30 %. The operating principle, More >
