CNC Rotary Cutting Skiving Machine for UHMWPE PTFE Teflon Film by SuKo
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Showing posts with label UHMWPE. Show all posts
Showing posts with label UHMWPE. Show all posts
Thursday, August 11, 2022
Tuesday, July 12, 2022
Monday, August 12, 2019
Preparation of UHMWPE fiber
UHMWPE,
also known as high-strength high-modulus polyethylene, is currently one of the
world's high-performance materials. Due to its comprehensive excellent
properties such as corrosion resistance, wear resistance and low density, it is
currently used in military protection materials, military mechanical materials,
aerospace equipment and other military fields. The development of
high-performance fiber is the foundation of a country's military equipment, and
the advanced material can lead to the advanced military technology, which has
become an important material foundation for the construction of a powerful
modern country, and occupies a decisive position in the field of military
materials worldwide.
1.
Properties of UHMWPE fiber
UHMWPE
fiber has excellent comprehensive properties, its relative density is small,
can float on water. And UHMWPE fiber is the strongest fiber in the world at
present. Compared with steel, UHMWPE fiber is more than ten times stronger than
high-quality steel. In addition, UHMWPE fiber also has strong corrosion
resistance, chemical resistance, wear resistance and other properties,
comprehensive performance, UHMWPE fiber in many important fields in China play
an important role.
1.1 Excellent
mechanical properties
Compared
with other high-performance fibers, UHMWPE fiber density is second only to
conventional PE fiber and polypropylene fiber, and it is the optimal fiber
material with the smallest density among bulletproof materials. It can reduce
the weight of the material and achieve a lightweight effect while ensuring
better bulletproof performance.
Compared
with other properties, the tensile strength of UHMWPE is only second to that of
PBO and polyaryl ester fiber, and it is only 0.1 different from that of
polyaryl ester fiber. It can be seen that UHMWPE has excellent tensile
strength.
Compared
with other fibers, the initial modulus is only second to PBO and carbon fiber,
which indicates that the fiber has a relatively good resistance to damage
tension and is not prone to deformation. It is a kind of characteristic fiber
with ultra-high specific strength and specific modulus, which plays an
important role in bulletproof material.
1.2 Electrical insulation performance
UHMWPE
fiber reflectance radar wave phenomenon is very few, with high conduction
efficiency, enhance the dielectric constant of composite materials. Although
the dielectric constant and loss value of polyethylene are the least among
other materials, UHMWPE fiber has the performance that traditional polyethylene
fiber can't reach, and it has better effect than general materials, so it is
the preferred material for radar radome, with high quality and light effect.
1. 3 Weather resistance and wear resistance
UHMWPE fiber has excellent weather resistance and can keep the original high
performance unchanged after a long time of illumination and harsh environment. At
the same time, UHMWPE fiber has higher wear resistance and bending fatigue
resistance than aramid fiber in high performance materials, so the wear
resistance of this fiber is better than other high performance fibers. Due to
its high wear resistance and easy processing performance, it has a good
application prospect in the industrial field.
1. 4 Chemical corrosion resistance
The
internal structure of UHMWPE fiber is relatively tight. It is precisely because
of the high crystallinity and orientation of the molecular chain inside the
fiber that the fiber has a strong chemical inertia. Therefore, under the acid
and base state or the high and low temperature state, the fiber can keep its
original performance unchanged for a long time, and still adapt to and play its
value in the harsh environment.
1. 5 Self-lubricating properties
UHMWPE
material compared with other engineering materials, UHMWPE material has very
low friction factor, low friction factor makes the fiber itself better
self-lubricating performance, it is the best material in plastic materials
under the condition of no lubricant, so UHMWPE material is widely used in
engineering, with very high use value. UHMWPE fiber is used in the operation of
the machine, compared to the traditional steel and brass under the operation of
the lubricant is better. Therefore, compared with ordinary materials, UHMWPE
fiber not only saves the raw material cost, but also guarantees the excellent
performance effect, so it has a higher use value.
2. Preparation method of UHMWPE fiber
2.1 Gel spinning method
There
are many methods to prepare high performance UHMWPE fiber, but due to the
reason of solvent itself, the preparation of UHMWPE fiber can not be achieved. Gel
spinning is the most ideal method. Gel spinning method is different from
general solution spinning or wet spinning, generally using high molecular
weight polymers as raw material, made of semi dilute solution as spinning dope,
flexible molecule chain solution to tangles in the semi dilute solution, and
then spinning, crystallization, high tensile stretch chain, after extraction
treatment to times the thermal stretching, which is made with high strength and
high modulus fibers. The gel spinning method has the following basic
characteristics: (1) ultra-high molecular weight polymer is used as raw
material;(2) use semi-dilute solution as spinning stock; (3) hyperthermal
stretching was carried out, and the tensile ratio was greater than 30.
2.2 Plasticizing melt spinning method
Melt
spinning is made of polymer melt by melt spinning and extruding. Plasticized
melt spinning is on the basis of melt spinning, adding an appropriate amount of
diluent to the polymer melt for spinning, through the twin screw mixed solvent,
and then extruded, soaked in the extraction agent, and then repeated stretching
can finally get high strength and high modulus polyethylene fiber.
2.3 High pressure solid state extrusion method
The
principle of extrusion forming is that granular solid solvent is added to the
extruder, the material barrel containing solid solvent is heated to the melting
temperature, so that the solid material is molten, the molten agent is
transported to the head of the machine with a fixed shape, and then after
cooling and shaping, the final product is solidified. High pressure solid
extrusion method is on the basis of extrusion forming high pressure melting,
forming solvent, then through the jet hole, and then high tensile, and finally
get high molecular weight polyethylene.
2.4 Surface crystallization method
Due
to the slow growth rate of fibrous crystal, this method is seldom used in the
preparation of UHMWPE fiber.
Saturday, August 10, 2019
Research progress of uhmwpe fiber
The idea of making high-strength
fibers from ultra-high molecular weight
polyethylene resins was born in the
1970s. Uhmwpe fiber has low density @ : 0.97 g/cm3). It is the fiber product
with the highest specific strength and modulus at present, and it is an
indispensable and important strategic material .Properties of uhmwpe fibers are
as follows:
Mechanical properties in the process
of gelatinized spinning, the quality and orientation of ultra-high molecular
weight polyethylene fiber have been greatly improved by multistage super
stretching, and the structure of folded chain polyethylene sheet has been
transformed into straight chain structure, which greatly improves the strength
and modulus of the fiber.
It is two times stronger than
high-strength carbon fiber and 14 times stronger than steel.
Chemical medium corrosion resistance
because of ultra-high molecular weight polyethylene fiber is a kind of
non-polar materials, excluding polar group in molecular chain, contains only c,
H, two kinds of elements, the surface under the action of tensile stress will
produce a weak interface layer, and fiber surface into chemical inertness,
therefore to acid, alkali and chemical reagent has a strong ability to resist
corrosion. In addition, because the molecular chain does not contain double
bond groups, heat and light aging resistance and other environmental stability
is very good.
Ultra-high molecular weight
polyethylene (uhmwpe) has the highest impact resistance of any plastic at
present. It is 3 or 5 times higher than polycarbonate, which is known for its
impact resistance .As uhmwpe fiber has high toughness, high modulus and high
fracture energy, it has excellent bulletproof performance.
The water absorption rate of uhmwpe is
the smallest in engineering plastics. It has excellent low temperature
resistance, and still maintains good impact strength below freezing point. The
minimum temperature can reach 1 269 ℃. The
surface adsorption of uhmwpe is very weak.
Based on its excellent comprehensive
performance, uhmwpe fiber has been widely used in many fields such as national
defense, military industry, aerospace and so on. The fiber has good impact
resistance and energy absorption, so it can be made into protective materials,
helmets and body armor. The bulletproof vest made of uhmwpe fiber has the
advantage of softness, and the bulletproof effect is better than that of
aramid. In addition, the specific impact load value of ultra-high quality
polyethylene fiber composite material is twice that of steel, and twice that of
glass fiber and arrayon. Foreign bulletproof and riot helmets made of
ultra-high molecular weight polyethylene fiber composites have become
substitutes for steel helmets and aramid reinforced composite helmets. During
the flight, shanyu fiber composite material has light weight, high strength and
good impact resistance, which is suitable for wing tip structures of various
aircraft. Uhmwpe could also be used for landing parachutes on space shuttles
and for hanging heavy objects on airplanes, replacing traditional steel cables
and synthetic fiber ropes.
Ultra high molecular weight
polyethylene (uhmwpe) fiber is also favored in some civil fields.A rope made of
this fibre breaks eight times as long under its own weight as a steel rope and
twice as long as an aramid. Its rope is used for fixed anchor rope of
supertanker, offshore operating platform and lighthouse, etc., which solves the
problems of corrosion of steel cable and corrosion, hydrolysis and ultraviolet
degradation of nylon and polyester cable, which cause the cable strength reduction
and fracture and need to be replaced frequently. In terms of sporting goods,
ultra-high molecular weight polyethylene fiber composite materials have been
made into hard hats, fishing rods, rackets, bicycles, glide boards, etc., whose
performance is better than traditional materials. Due to its excellent chemical
inertia, uhmwpe can be used as medical devices such as sutures and artificial
muscles in the field of biomedical materials. In terms of building materials,
uhmwpe staple fiber reinforced cement composites can improve the toughness and
impact resistance of cement.
Thursday, August 1, 2019
Properties and applications of UHMWPE Rod
Excellent abrasion resistance, good resistance to low
temperature impact, self-lubricity, non-toxic, water and chemical resistance,
heat resistance is better than general PE, disadvantages are heat resistance
(thermal deformation temperature) low, poor processing and molding, surface
hardness, rigidity, creep resistance as general engineering plastics, expansion
coefficient larger. UHMWPE has poor fluidity and extremely high viscosity in
the molten state. It is a rubber-like high-viscosity elastomer. At the early
stage, it can only be molded by pressing and sintering methods.
Higher mechanical properties than ordinary high density
polyethylene. Excellent impact resistance, stress cracking resistance, high
temperature creep resistance, low friction coefficient, self-lubrication
resistance, excellent chemical corrosion resistance, fatigue resistance, noise
damping resistance, nuclear radiation resistance, etc.
The operating temperature is 100 ~ 110℃.Good cold
resistance, can be used at -269℃.The product has a density of 0.935g/cm3 and a molecular weight of 2
million. Its tensile strength at break is 40MPa, elongation at break is 350%,
elastic modulus at bending is 600MPa, and the cantilever beam is constantly
impinged by the gap. Abrasion (MPC method)20mm.
Uhmpe bar can replace carbon steel, stainless steel, bronze
and other materials for textile, paper making, food machinery, transportation,
medical treatment, coal mine, chemical industry and other sectors. Such as
textile industry on the shuttle, shuttle rod, gear, coupling, sweeping rod,
buffer block, eccentric block, rod sleeve, swing consequences and other impact
wear resistant parts. Paper industry to do box cover plate, wiper plate,
compression parts, joints, transmission machinery seal shaft, deflector wheel,
scraper, filter, etc. The lining of hoppers, silos and chutes for powdery
materials in the transport industry.
Uhmwpe rod can be used for all kinds of mechanical parts,
including food machinery gear, worm wheel, worm, bearing. Chemical pumps,
valves, baffles, filters. Medically, it can also be used for heart valves,
short surgical parts, artificial joints and birth control implants. Sports to
do skating floor, ground track, ski, motor sledge parts.
Application scope and polyamide, ptfe similar, wear
resistance than carbon steel, do gear, bearing, bearing bush, star wheel,
valve, pump, guide rail, sealing packing, equipment lining, sliding plate,
artificial joints, fiber for bulletproof jacket, rope, etc.
Ultrahigh molecular weight polyethylene (uhmwpe) rod has
many excellent properties, but few people know its existence, which is mainly
due to the lack of previous research on the melt characteristics of uhmwpe, and
the processing method is basically still in the backward press-sintering
process. In recent years, with the continuous development of uhmwpe processing
technology, its products have been successfully applied in many fields.
Color: primary color (white), black, other colors can be
customized
Tuesday, June 18, 2019
SUKO is attending a manufacturing expo in Bangkok
Are you still worried
about semi-automatic machines on the market? Are you still anxious about
the equipment for Polymer/PTFE/UHMWPE products? This is a good opportunity now!
SUKO is attending the Manufacturing
Expo(ME) in Bangkok, Thailand on June19-22, 2019. ME is an event dedicated to
machinery and technology for manufacturing and supporting industries, It fully
reflects the level of machinery manufacturing and mechanical equipment
development in Asian.
Here are some popular products we
produced: Auto extrusion/bush molding machine, Auto Gasket Machine,
UHMWPE Rod Extruder, PTFE Tube Extruder, etc. They are all automatic
machines, which help customers improve productivity and quality. These products
also have longer working life and are friendly to environment.
The specific marketing advantages are as
follows:
ü PTFE
Automatic Press Molding Machine-It is suitable for pipe and rod, it has PLC
control and screen touch system. Furthermore, if
PTFE powder is exhausted, it will
alarm Automatically.
ü Auto
Gasket Machine-It has advantages of environmental protection, time saving, high
efficiency, long service life, good heat dissipation and good quality of
accessories.
Come to this event, Here are the newest
innovations and solutions by 2,400 brands from 46 countries.
Come to our booth, We have professional
and technical personnel to solve your problems immediately. What’s more, plenty
of advanced and complete equipment for your choice, such as PTFE AutomaticPress Molding Machine, Auto Gasket Machine, UHMWPE/PTFE Rod Extruder and
so on. In addition, at the international exhibition, you can consult a wide
range of topics for your needs, or compare a large amount of manufacturers to
select your favorite devices.
Detailed exhibition
information is as follows.
Time：June
19-22, 2019
Address：Bangkok
International Trade and Exhibition Centre，
88 Bangna-Trad Road (Km.1), Bangna,
Bangkok 10260, Thailand
Booth Number：3D34
We sincerely hope to establish long-term
cooperation with you, we will try our best to provide high quality and
excellent service, we will cherish every opportunity to cooperate with you!
Looking forward to your visit!
Thursday, June 13, 2019
The application of UHMWPE material is introduced
In recent years, UHMWPE has been widely used in board, profile, pipe and
other main fields.Market research shows that UHMWPE has become a widely used
industrial raw material with its excellent abrasion resistance, which is widely
used in coal mining, shipbuilding, floor MATS and other occasions and products. These products need certain processing technology,
the use of some equipment: for example, UHMWPE/PTFE tube extrusion machine, Polymer/Teflon bar extrusion machine, molding machine,
Polymer PTFE sintering furnace, PTFE Gaskets Press moulding machine, etc. In recent years, China's
demand for this product is increasing day by day.
UHMWPE
separator is basically used in automobile battery manufacturing industry in
developed countries in Europe and America.UHMWPE can also be used for viaduct
as underrail spacer. UHMWPE film is based on UHMWPE board, which is a film with
a thickness of less than 1 mm after cutting.Ninety percent of UHMWPE's
customers are electronics floor mat manufacturers, and up to 95 percent of them
are used for mouse floor MATS.There are some differences in the use of UHMWPE
fiber between Europe and America and Japan. It is mainly used for body armor
and weapons and equipment, accounting for 60% ~ 70% of the total consumption,
followed by cables, fishing nets and labor protection supplies.Japan is mainly
used for cables, fishing nets and labor protection equipment.
Compared with
teflon (teflon) used in traditional mouse pad, UHMWPE film is more
wear-resistant, and its self-lubricity is second only to teflon material.Cost,
UHMWPE film density is small, according to square conversion UHMWPE film than
fluron 50% lower.Therefore, UHMWPE film has gradually replaced teflon as the
preferred raw material for floor MATS in OEM factories.
Tuesday, June 11, 2019
PLC control system of Polymer extruder
The PLC control system of extruder has been widely used in many fields such as cemented
carbide, pharmaceutical, food processing and mechanical processing. Extrusion technology is
widely used because it can obtain products with uniform density in the
direction of extension and high production efficiency. Currently on the market
for some extrusion machine,
such as: Polymer Teflon Rod extruder, PTFE UHMWPE tube extruder,etc.
extrusion machine while there are almost one hundred years of history,
but with the rapid development of information technology, all kinds of
information technology in the layer, especially the detection technology, PLC
control technology,microelectronics technology and modern control technology
development puts forward new challenge on the extrusion machine. It is very
important to study the application of PLC control system because the control
system is developed in high efficiency, high speed and high precision.
With the rapid development of manufacturing industry, industrial aluminum
profiles have been widely used in various high-tech industries, such as
aviation, bullet trains, ships and so on. The forming technology of metal
aluminum profile mainly includes extrusion, forging and calendering. According
to the extrusion molding process, such as the whole
process will use the Polymer Teflon bar extruder, PTFE UHMWPE tube extruder, MouldingMachine, PTFE Gaskets Press Moulding Machine, Cutting Machine, PTFE Skiving Machine, Dry Grinder, cleaning
machine, vibration screen, automatic feeding machine. The control system
of extruder is emphasized. This set of control system combines PLC, MES and
upper computer to realize online intelligent management, visual management,
process control, process analysis and product traceability of production
process.
Isothermal extrusion
speed control is an important method for high efficiency and high quality
production in rare metal processing enterprises. Different raw materials (Polymer, PTFE, Teflon, UHMWPE), extruder extruded
products are different, such as color, shape, density, etc. According to the
characteristics of the treasure titanium 25M extrusion machine equipment,
combined with the actual production condition, titanium simulation of
isothermal extrusion speed control system, put forward to simulate the
isothermal extrusion speed control system architecture and function of system
implementation, is developed based on industrial PC + PLC titanium simulation
of isothermal extrusion speed control system, using the prediction algorithm to
build the extrusion speed prediction model. The system can achieve isothermal
extrusion of titanium, shorten the extrusion time, and operate reliably.
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