PTFE Piston Rings

Polytetrafluoroethylene (PTFE) seals and piston rings have started to replace their carbon counterpart as PTFE seals and rings offer greater durability, have a longer operating life, and can be operated at various pressures, velocities and temperatures.

PTFE seals and rings are becoming more common in a variety of applications and industries because of the unique advantages they offer.

PTFE Piston Rings and Guide Rings (Rider rings) for dry-running applications are currently a focal point of technical development. 

They significantly reduce a machine’s operating costs and, in today’s increasingly environmentally aware society, make it easier for operators to fulfill stricter environmental legislation.

Properties

Exceptionally low friction coefficient in combination with metals and plastics
Antiadhesive behavior without any stick-slip effect
High elongation properties enabling easy fitting
of sealing and guide rings to one-piece pistons
Exceptionally large temperature range from –200°C to +260°C
Chemically resistant to almost all solid, liquid, and gaseous media
Ageing-resistant
Nonflammable
Physiologically neutral in the stated temperature range

Suitable for the Following Application Areas

Compressors operating under full- and low-lube conditions
Gas rotary pumps
Expansion machinery
Liquid gas and vacuum pumps
Rocking piston pumps
Rotary compressors for loading/unloading of silos
Generation of oil-free compressed air for the
food processing industry, pharmaceutical industry, and dentistry
Compressed air for the craft and do-it-yourself market
Pneumatic hammer drills
Automotive technology, including ride leveling
and air-conditioning systems

Source:https://www.sukoptfe.com/ptfe-piston-rings

PTFE Piston Seals and Rod Seals

The rod seal is the most critical seal on any type of fluid power equipment preventing leakage of fluid from within the cylinder to the outside. Leakage through the rod seal can reduce equipment performance, and also in extreme cases can cause environmental issues.

PTFE piston seals (PTFE rod seals) as Spring-energized seals and memory packings are always the ideal choice for sealing static or dynamic pistons and rods.

Properties

Outstanding dry-running characteristics
Low wear
Low friction
Variable friction conditions through choice of spring characteristics
Extremely low breakaway forces even after prolonged downtimes
No stick-slip effect even at low sliding speeds
High dimensional stability
High chemical and thermal stability
No volumetric change by swelling or shrinkage
Compact seal, suitable for O-ring assembly spaces in acc.
Good cost-benefit ratio
Dimensions from Ø 2 to 3,000 mm available
Very good wiping effect with abrasive media, such as paints and lacquers
Sterilizable
Easy to rinse

Suitable for the Following Application Areas

Automotive industry, e.g., in gasoline direct injection and in headlight cleaning devices;
General mechanical engineering, e.g., in valves, solenoid valves, CNC machines, compressors, and vacuum pumps as well as tank systems;
Aerospace industry, e.g., in landing gear systems;
Food processing industry, e.g., in filling machines and metering systems;
Pneumatics, e.g., in cylinders and other pneumatic components;
Medical engineering and analytics, e.g., in chromatography and endoscopy;
Offshore technology, e.g., as petroleum and natural gas seals;
Chemical plant and equipment technology, e.g., in apparatus and container engineering;

Source:https://www.sukoptfe.com/ptfe-piston-seals-and-rod-seals

PTFE Laminates

Laminates are reinforced PTFE, consisting of a PTFE film or plate on the one hand and a substrate on the other. The layers of material are firmly bonded to each other. 

Possible substrates include fabrics, fibers, or knitted fabrics as well as films. They consist, for example, of glass, metal, ceramics, elastomers, or high-performance polymers.
The structure may comprise two or more layers, and constructions with up to 7 layers are not uncommon.

Properties

Outstanding resistance to a wide range of chemicals;
Very broad functional temperature range, only limited at the upper end by resistance of the adhesive used;
Very good antiadhesive properties;
Dimensional stability and resistance to stress cracking;
No embrittlement, no ageing;

When modified PTFE is used as a film material, these properties are enhanced further by:Polymer structure with higher density and fewer pores;Lower permeability;Better weldability;

Application:Linings in plant engineering;Components for electrical and electronic applications;Diaphragms in pump or sensor construction;Optically transparent compounds for textile construction;

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PTFE Bellows Forming Machine

PTFE bellows are used, for example, as compensating elements between engineered parts. By specifically using different fold geometries, any combination of properties can be achieved as required—for example, high flexibility or compressive strength.

PTFE Bellows Properties

Almost universal chemical resistance
FDA conformity for food and pharmaceutical products
Highly suitable for sterilization
Antiadhesive behavior
Large temperature range of –60°C to +200°C
Cost-effective series production from semifinished product to final product
High reverse bending strength
Good dimensional stability
Low tooling costs
Freedom of design

PTFE Bellows Application:

As compensation for expansion in pipe systems;For shielding sterile areas;Filling lines;Aseptic valves;Solenoid valves;Metering devices;Pumps and valves, coating technology, steel mills, fitting industry.

Manufacturer of standard & custom designed machines including bellows forming machinery. Bellows forming machines are available in different models with electronic controls & safety features.

Machine design engineering & consulting services are available.

Contact Us:https://www.sukoptfe.com/index.php?route=information/contact

Extruded PTFE Film

Sintered extruded PTFE film is a quality high modulus non-adhesive PTFE film manufactured by extrusion and sintering processes. The resulting film is characterized by high dielectric strength and chemical resistance, low moisture absorption and resistance to permeability.

PTFE Extruded Film Tape, a PTFE extruded film with silicone adhesive, provides an exceptionally slick surface when applied and resists curling during unwind. The PTFE extruded film tape has a chemical resistant surface for sealing and masking.

The extruded PTFE film tapes lie flatter than the typical skived PTFE film tapes. With the thicker backing, it helps extend the service life, compared to thinner versions, when subjected to abrasion or wear. While providing excellent chemical resistance except to organic solvents, the silicone adhesive will be attacked by commercial organic solvents and is not recommended for applications requiring organic resistance.

Some applications where the PTFE extruded film tape can be used include easy-release surfaces on rollers, plates, belts and other surfaces where build-up of sticky materials and inks can occur. It may also be used for low coefficient of friction surface on rollers and formers to facilitate web movement, along with wrapping rubber nip rollers on hot polyethylene extrusion machines.

PTFE Square Rod

PTFE is a low friction fluoropolymer with outstanding chemical and weathering resistance. The working temp range is -20°F - 500°F. It has the lowest coefficient of any solid. It has no slip-stick characteristics; static and dynamic coefficients are equal. Nothing sticks with any strength to unheated surfaces. Both virgin and mechanical grades are UV stabilized. 

PTFE is a low friction fluoropolymer with outstanding chemical and weathering resistance.

Lowest coefficient of any solid
Has no slip-stick characteristics
Static & dynamic coefficients are equal
Nothing sticks with any strength to unheated surfaces
UV stabilized
Virgin grade
Temperature range: -20°F to 500°F
Meets FDA & USDA standards

Source:https://www.sukoptfe.com/ptfe-square-rod

PTFE slide bearing sheets

PTFE has the lowest friction coefficient of all plastics even if these are lubricated. Typical behaviour is whenever the load on PTFE increases friction coefficient becomes lower. PTFE has no "stick slip" behaviour which is unique in slide bearing technology.

Characteristics as stated above means an advantage for PTFE in bearing applications. Due to the fact no lubricants are required, PTFE (or compounds) is often used in food industry, road (bridge) construction, support of pipe systems and heavy installation constructions. By adding PTFE to the free movable construction parts (metal, rubber and so on) shrink and expansion, due to temperature movements, will not become an issue.

PTFE 100% virgin is a relatively soft material and can be too porous for heavy constructions. By adding fillers to the PTFE, required characteristics for specific applications will improve.
For example glass, bronze, graphite or carbon are commonly used. Friction coefficient will be slightly influenced due to these fillers. In general most optimal gliding construction with lowest friction is obtained in case PTFE is maximal loaded and counter surface is highly polished.

Properties PTFE

• Lowest friction coefficient
• No stick slip behaviour
• No cleaning required, material is chemical and weather resistant, does not age
• Simple engineered
• No material breakdown
• Electric and thermal isolating
• Absorption in movement

Source:https://www.sukoptfe.com/ptfe-slide-bearing-sheets

Types of Plastic Blow and Injection Molding

Each plastic part requires a specific manufacturing process which can be significantly different from one product to another. Injection molding is used to manufacture solid components while blow molding is used to make plastic products with hollow areas, such as bottles and containers

Injection stretch blow molding combines the injection molding and blow molding processes.The plastic is first molded into a solid preform, to create a threaded bottle neck. Once the preform cools it is fed into a stretch blow mold machine. The preform is then reheated using an infrared heater and blown into a plastic bottle with forced compressed air.

The Injection Molding Process

Injection molding is used to manufacture higher volume quantities of plastic products ranging in size from large components to small components requiring micro-precision accuracy.

There are many types of manufacturing  methods categorized under injection molding, such as thermoplastic injection molding, over molding, insert molding, cold runner molding and hot runner molding.

Thermoplastic Injection Molding

Thermoplastic injection molding uses thermoplastic polymer, meaning it changes to a liquid state when heated. Unlike thermoset plastics that cool into permanent solid, thermoplastics can be remitted into a liquid after cooling into a solid.

Overmolding

Overmolding, or two shot molding, is a process that covers an injection mold over another substance, such as metal, to improve the performance or durability of a product. A rubber-like compound, called thermoplastic elastomer (TPE), is a commonly used overmold material. An example of a TPE overmold application is the handle grips on a toothbrush.  Overmolds can also be used to seal products with parts made from several injection molds.

Insert Molding

Like overmolding, insert molding is an injection moldingprocess that combines two or more components into a single finished product. Insert injection molding inserts a component into the injection mold cavity and plastic material is filled around the insert. Inserts can add strength to a product and eliminate the need for additional parts to reduce the product weight.

Cold Runner Injection Molding

Cold runner molds use a sprue to fill the runners that inject plastic resin into the mold cavity.  In 2 plate molds, the runner system and parts are attached, and an ejection system may be used to separate the pair from the mold.The cold runner can reduce waste by recycling and regrinding the material, but this can also increase the total cycle time. Cold runner systems can be used for a wide variety of polymers and can allow for easy color changes.

Hot Runner Molds

Hot runner molds use a manifold to heat melted plastic resin and then send the material through a gate to fill the mold cavity. The two main types of hot runner molds are externally heated and internally heated.  The externally heated molds can be used with polymer that is less sensitive to thermal variations while internally heated hot runner molds allow for better control of material flow.

Because  hot runner molding  does not require the use of runners, potential waste material is reduced and  the recycling and regrind and process of virgin plastic does not impact the total run cycle time.

The Blow Molding Process

During the blow molding process, the raw plastic material is shaped into a hollow tube with one open end called a parison. The parison is pressed into a cooled metal mold and compressed air is forced into the parison. When the formed plastic cools and hardens, the metal mold opens and expels the product.

Source:https://www.sukoptfe.com/types-of-plastic-blow-and-injection-molding

PTFE Adhesive High-Temp Tape

PTFE high-temperature adhesive tape is produced by using base cloth weaved from imported glass fiber that is coated with polytetrafluoroethylene and processed with a special process. It is a new high performance and multipurpose composite material. Due to its excellent performance, it is extensively applied in the fields including paper making,foods, environment protection, printing and dyeing, garment, chemical engineering, glass, medicines, electronics, insulation, grinding wheel slicing and machinery.

1. With good wear resistance, penetration resistance, breakage resistance, it is easy to use and has long service life.
2. Applied in between -70°C and 260°C, it features weathering resistance and aging resistance. The actual application proves that when it is placed at 250°C for continuous200 days, both of its strength and weight will not be reduced; when it is placed at 350°C for 120 hours, its weight reduces by only about 0.6%; the original flexibility is well maintained at -180°C.
3.Non-adhesion: Smooth surface, not adhesive to any substance. Oil stain, smudge or other deposits adhered to its surface can be easily cleaned; almost all deposits such as paste, resin or coating can be easily removed.
4. Chemical corrosion resistance, resistance to strong acid, strong base and various organic solvents.
5. Chemical resistance and non-toxicity. Resistant to almost all chemical reagents.
6. High insulation (low dielectric constant: 2.6, tangent below 0.0025),ultraviolet-proof, anti-static.
7. Fire-proofing.

Main Applications

A. Coating of various high-temperature rollers, heating sheet and demoulding workpiece.
B. Sealing of foods, chemicals and plastic bags.
C. Pad pasting for sliding chute, hopper and aviation molds, also suitable forrollers of sizing machine and thermoplastic demoulding. It can be repeatedlyused and is easily replaceable.
D. Suitable for surface treatment requiring anti-sticking, anti-corrosion and high-temperatureresistant surface.
E. Applied in the fields such as packaging, thermoplastic, compound and sealing,electronics.

Industry:
1, LCD, FPC / PCB and other optoelectronics industry
2, food, pharmaceutical packaging industry
3, plastic heat sealing machine, high-speed sealing machine
4, hot melt machine
5, motors, high and low voltage electrical products, wire and cable insulation, battery manufacturing
6, sewing machine car, shovel Paper Machine
7, rubber-coated plastic rollers
8, other required high temperature, wear, corrosion resistance, anti-sticking place

Source:https://www.sukoptfe.com/ptfe-adhesive-high-temp-tape