Tensionless Dryer

What is Tensionless Dryer

Used for the shrinkage, relaxation and tensionless drying of tubular or open-width knitted fabrics. The fabric guidance, wether single, double or multiple strand is effected at one treatment level. Prior to the last treatment chamber, the fabric passes through a steam and vibration section, which helps to enhance the fabric volume and soft fleecy handle. Nozzles with large volumes of air enable the water to be heated very quick to the evaporation point.

Advantages of Tensionless Dryer

The fabric before manufacture can be stabilized in size and structure by uniform tension-free relaxation and shrinkage of the fabric.

The fabrics suitable for washing in the printing and dyeing factory are comfortable and soft, and the fabrics increase the value of the products under the respective market quality requirements.

The three-layer mesh belt structure of the device saves floor space and improves heat utilization efficiency.

The unique hot air nozzle design of the tension-free dryer, the temperature distribution is evenly distributed to make the fabric more uniform, faster and dry.

The upper and lower alternate arrangement of the hot air nozzles causes the fabric to advance in a wave motion on the mesh belt, and the regular turning of the fabric helps to dry the shrinkage and slack.

The hot air is sprayed strongly through the slit, so that the fabric is windy during the feeding and drying process, and simultaneously walks with the conveying net cloth, and the fabric is dried under the condition of no tension, so the shrinking effect is great, the fabric feels Rich, comfortable and soft, and upgrade the grade of the fabric.

Why Choose US

01/

Our Factory
Workshop dimension: More than 10000m².
Totally produced machine quantity:More than 2000sets
Exporting countries:More than 40 countries
Market share:80% in home market

02/

Our Product
Stenter machine, Balloon padder machine, Five （ seven）pass relax dryer, Tubular compactor, Tubular calander, Tubular heat setting machine, Rope open slitting machine, Open width compactor , Air turning And so on.

03/

Production Equipment
Machining facilities: CNC laser cutting machine,bending machine shearing machine,CNC lathe machines and so on.

04/

Production Market
Market share:80% in home market
Machine export to more than 40 countries .

Technical Specifications

Nowadays, the best drying machine is tensionless dryer with 3 layers net belt. It is so advanced in technology and actual production, each chamber’s temperature and speed could be controlled by operator, so the perfect effect result could be reached by different feeding speed. Enough dry or consist of small water percent for different purpose.

Name	Relax Dryer Machine
Application	Drying the fabric
Suitable Fabric	Knitted and Woven Fabric
Layout	Reference Above Layout
Max. Working Width	2000~2800mm
Machine Speed	0~30m/min
Motor	11kw 2motors/chamber
Power Supply	380V·3P·50HZ (standard) / 220V·3P·60HZ (optional)
Working Type	Three-layer net belt cycling
Driving Type for net belt	PLC+Inverter control
Heat-setting Type	Thermal Oil/ Natural Gas/Steam
Max Drying Temperature	140~160ºC
Temp. control type	Automatically
Length of Chamber	2.1M
Comments:	Schneider / Honeywell / Siemens / etc famous brand products applied.

Working Principle of Tensionless Dryer

The fabric is laid on the transporting belt of the relax dryer machine at the feeding unit, which includes the overfeeding roller and a special apron. The fabric is ideally guided in wave form through the drier. The nozzle alignment forces the fabric to a fast and intensive drying, which includes tumbling effect. The moisture control in the chambers is optimized for energy saving. A steaming and vibration chamber enhances the bulkiness and supports the shrinkage process. The exit unit is composed of an inclined wooden lathed belt to cool down the fabrics before plaiting.
Every chamber is equipped with manual lint filters, which can easily be cleaned during operation. Optionally an automatic lint filter system can be built in instead. The process control is easily monitored via , HMI equipped with touch screen panel.

Main configuration of Drying Machine

1	Fabric Entry System	1:Overfeed roller movement have been controlled by inverter 2:Net-Belt tension-compensation system: Automatically pneumatical control,keep belt tension go smoothly. Belt will be automatically loosed while the running stop so that keep the belt for always be good condition of using 3:Net-Belt guide correction system:Independent inverter and automatically pneumatical control. Both sides have limiting device for protecting the net-belt off-tracking
2	Drying System	1:Fabric will be floatly forwarding by Hot-air blowing in the chamber, tension of. 2:Fabric will be recoved to natural status 3:Nozzel have been made by superior carbon steel,low-noise,high-strength,the flow of air-blowing is highly even. 4:Every chamber have 2*11KW blower motor( Insulation Class F,easily maintenance) and high strength steel centrifugal fan which can improve the efficiency of hot-air circulating up to 15%-30%. Both of motor and fan can be drawn out from the chamber for easily fixed and maintenance. 5:Every chamber have 2 sets of filter net, 40mesh stainless steel, it can be easily drawn out from chamber for cleaning the wasted fuzz. 6:The thickness of insulation board is 105mm,stuffed with rock wool. And the gap between the board have high temperature resistance rubber seal for keep the warm to the utmost. 7:Net belt is made by Dupont company,which material is fiber glass with PTFE coated, high air-permeability and temperature resistance up to 260℃.
3	Fabric Exit System	1:Rubber belt transfer the fabric without any slippage ,running smoothy, have no tension force to fabric 2:Pendulum roller tidy the fabric
4	Electrics	1:PLC+INVERTER control driving and hot-air blowing 2:Inside electricity cabinet have air-condition regulate the temperature
5	Pneumatics	1:Gas-water separator,filter,pressure reducing valve,reversing valve,pipe and cylinder etc

Structure of Tensionless Dryer

Feed system: Used to convey wet material to the inside of the dryer. The feeding system usually includes conveyor belts, screw conveyors or other types of material handling equipment to ensure that the material can enter the dryer smoothly.

Hot air system: Responsible for providing hot air for drying. The hot air system usually consists of a burner, a hot air generator and a fan. The burner burns fuel to produce high-temperature flue gas, and the hot air generator mixes the flue gas with fresh air and heats it, and then sends the hot air into the dryer through the fan.

Drying chamber: It is the main space for drying materials. There are usually one or more conveyor belts in the drying room, and the materials move continuously on the conveyor belts while being blown by hot air to achieve the purpose of drying. The temperature and humidity in the drying room can be adjusted by controlling the hot air system.

Discharging system: Used to discharge the dried materials from the dryer machine.The discharge system usually includes a discharge port and a discharge conveying device, such as a conveyor belt or a screw conveyor, so that the dried material can be smoothly sent out of the dryer.

Operation Process of Tensionless Dryer

After driving, check whether the mechanical, electrical, instrumentation and safety guards are in good condition. Set the temperature according to the process requirements, then turn on the circulating fan, and set the speed of the main engine as 15m/min in the heating stage, and the cloth can be put on when the set temperature is reached. After meeting the requirements for the upper cloth, open the active brush wheel, press the cloth on the needle plate, and make the two sides as flush as possible. In addition, put down the passive brush wheel and tighten the fabric. When starting the main engine, you should ring the bell to notify the operator at the rear of the vehicle. When the cloth reaches the rear of the vehicle, you should put on the cloth at the fastest speed, and tighten the fabric. The rear personnel should cooperate with each other before calling and responding.

The safety cover should be intact at the cloth entry and exit points of the machine, so as to prevent the needle cloth clip from hooking the sleeve, and in addition to prevent the chain from breaking and flying out and hurting people.

The rolling car rope pulls the emergency stop switch and the cloth feeding safety handle is reliable and effective. It is necessary to stop the cloth when the cloth is operated, and the upper roller is pressed and lifted.

The grey fabric must be seamed, and no knots are allowed to prevent damage to the rubber roller and cause an accident.

After shutdown, the cooling should be reported to the heat transfer oil furnace room. Then stop the operation of the circulating fan, open the door to cool down, and run the main engine and the top exhaust fan alone. When the temperature drops to 80 °C , the machine can be stopped, which can avoid uneven heating of the chain clips.

Cautions During Using Tensionless Dryer

The tensionless dryer is a new type of equipment, which adopts mechanical frequency conversion speed regulation, and the cloth feeding, cloth discharging and host speed are automatically displayed, and the operation is more convenient and easy to understand. The device is driven by a conveyor belt and is completely tension-free. The advanced jet system makes the fabric run in a wave shape, and has a shrinking function. The conveyor belt automatically corrects the deviation to ensure safe and reliable operation of the mesh belt.

The precautions regarding the use of tensionless dryer are as follows:

The feeding door can be started after it is closed and locked. After the machine stops running, remove the fabric to avoid accidents.
Frequently clean the filter screen of the induced draft fan to keep the air in the air.
steam dryer should always pay attention to the stability of the air pressure, the smooth flow of the steam trap.
The electric heating type adopts high-efficiency energy-saving heating pipe. When using, the whole machine should be grounded reliably. The grounding device must comply with relevant national standards and regulations.

Is There a Temperature Difference Before and After the Dryer

There is of course a certain difference in the temperature between the front and rear and the left and right. The temperature difference between the front and the rear may be relatively large. Under normal circumstances, the difference between the left and right is very small. The temperature difference between the left and right is related to the manufacturing of the setting machine. The general design will take this into consideration. When there is a temperature difference between left and right (the actual effect of the fabric will have color difference or left and right hand feelings), it is necessary to call equipment maintenance or equipment after-sales. The temperature before and after, and the temperature in the drying room will be lower. On one hand, it is wet and cold. The two aspects of the cloth inlet are that cold air will be brought in when the cloth is fed in, and the back of the cloth will be brought out with heat from the cloth outlet, so the temperature will be relatively higher.

Technological Elements of Drying Stenter Machine

Temperature is the most important factor affecting the heat setting quality. After heat setting, the degree to which the original wrinkles are eliminated, the improvement of surface smoothness, the dimensional thermal stability and other wearing properties of the fabric are closely related to the heat setting temperature.

Time: Setting time is another main process condition of heat setting. After the fabric enters the heating zone, the time required for heating and setting can be divided into the following parts:

Heating time: The time required for heating the fabric surface to the setting temperature after the fabric enters the heating zone.

Heat penetration time: After the fabric surface reaches the setting temperature, the heat penetration time required to make the fibers inside and outside the fabric have the same setting temperature.

Molecular adjustment time: After the fabric reaches the setting temperature, the molecules in the fiber are adjusted according to the setting conditi ons.

Cooling time: The time required for the fabric to come out of the drying room and fix the size of the fabric for cooling.

Regular Inspection of Tensionless Dryer

Regularly check the heat transfer oil pipeline in the oven. For example, if there is oil leakage, it should be dealt with in time; after the shift, the flying waste in the machine should be cleaned, and the flying waste and oil pollution in the exhaust pipe should be removed regularly to eliminate the hidden danger of fire.

Add a steam pipe above the exhaust duct at the bottom of the oven, which can use steam to cool down and extinguish the fire. When the temperature inside the machine is higher than 165 ℃ , the steam valve is normally open; The fabric fell on the fins and caused a fire.

The car must be turned off when cleaning or refueling, and it is strictly forbidden to wipe the chain, brush the needle plate, and wipe the roller (especially the upper and lower rollers) while driving to prevent fingers from being stabbed , When cleaning or repairing the car on or inside the aircraft, it is necessary to hang a stop sign on the operating table to prevent others from driving and causing accidents.

It is strictly forbidden to place any objects and food in the oven, on the distribution box and the machine.

Always check whether the emergency stop safety device and bumper of the rolling mill rope are in good condition and effective. Threading operation is required .

FAQ

Q: What is relax dryer?

A: Relax dryers are suitable for drying, relaxing and shrinking of dyed or bleached knitwear and delicate woven fabrics from cotton, synthetics or wool and its blends. Fabric is allowed to achieve shrinkage nearest to residual shrinkage value, bringing soft and voluminous feel.

Q: What are the dryness levels on a dryer?

A: When you dry your laundry, you can choose between a couple of dryness levels. This determines how dry your laundry will be. The 4 most common dryness levels are iron dry, cupboard dry, cupboard dry plus, and extra dry.

Q: What type of dryer is most efficient?

A: All heat pump dryers meet the criteria for Most Efficient. A heat pump dryer works as a closed loop system by heating the air and using it to remove moisture from the clothes, then reusing that air once the moisture is removed.

Q: How do I reduce moisture in my dryer?

A: Solution: Regularly clean and inspect the dryer venting system to ensure proper airflow. Clear any debris or lint obstructing the vents. To create enough ventilation, consider installing a vent hood. A booster fan can also improve ventilation efficiency.

Q: What are the different types of mechanical dryers?

A: There are three generic forms of mechanical dryer commonly found in use today. The vertical dryer, the horizontal dryer and the silo or stationary- bed dryer.

Q: What makes a dryer more efficient?

A: Clean the lint filter after every load to improve air circulation and increase the efficiency of the dryer.

Q: Which type of dryer is more efficient?

A: Vented dryers use about a fifth less energy than a condensed dryer would use to dry a full load, but if you have a super energy efficient dryer with a heat pump then they are even more efficient.

Q: What is a relax dryer machine used for?

A: Salient features : Suitable for tubular, open width knit as woven fabrics, whether natural or synthetic based. perfect tensionless conveying system offerslowest residual shrinkage. possible for both drying hear treatment. suitable steam, oil, gas heating system.

Q: How does anti static dryer work?

A: During the tumbling of the dryer, dryer sheet cationic (positively charged) ingredients are activated by heat and released from the substrate to transfer onto fabric. The anti-static/softening agents in coat the fibers providing an anti-static benefit throughout the load.

Q: How do I stop my dryer from being static?

A: Try adding two aluminum foil balls in the dryer or secure two safety pins to two dryer balls. The metal will help reduce static cling. Use white distilled vinegar. This will reduce static cling and add softness to your clothes.

We're well-known as one of the leading tensionless dryer manufacturers and suppliers in China. Please feel free to buy high-grade tensionless dryer for sale here from our factory. All our products are with high quality and competitive price.