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Showing posts with label film. Show all posts
Showing posts with label film. Show all posts
Monday, August 15, 2022
Thursday, August 11, 2022
CNC Rotary Cutting Skiving Machine for UHMWPE PTFE Teflon Film
CNC Rotary Cutting Skiving Machine for UHMWPE PTFE Teflon Film by SuKo
WhatsApp/phone: +8619975113419
mail: info@ptfe-machinery.com
Wednesday, August 7, 2019
Development of insulating ptfe film for mutual inductor
Transformers are often used to
provide current and voltage signals to electric energy measurement,
measurement, control, relay protection, etc. Their accuracy and reliability are
closely related to the safety, stability and economic operation of the power
system, and are one of the important high-voltage equipment in the power
system. With the development of the power industry, the transmission capacity
of the power system is increasing, and the operating voltage level of the power
network is getting higher and higher. With the continuous improvement of the
voltage level, the transformer is faced with the problem that the insulation
structure is difficult to meet the operation requirements in the manufacturing.
As is known to all,
polytetrafluoroethylene (PTFE) because of their excellent performance (class c
insulation), chemical corrosion resistance, weather resistance, mechanical
properties and thermal stability of the extraordinary, heat-resistant
performance of ultra wide (use for a long time working temperature 150 ℃ ~ + 260 ℃), etc., in
the field of electronic appliances, wire and cable, insulation has been more
and more widely used. PTFE membrane can be used between the transformer winding
copper foil, insulation and adhesive, through the film for improve the
insulation class of transformer, reducing the gap between the layers of
transformer and can enhance the mechanical strength of transformer, in
addition, PTFE membrane can be used for dry type transformer, capacitor,
electric instrument, such as gasket between the layers of insulation and
heat-resistant electromagnet, line installation, heat insulation of the wire,
has the very broad market prospect. The preparation method and performance
research of PTFE film for mutual inductor insulation are also paid much
attention by many domestic and foreign scientific research workers and
processing enterprises. In this paper, the preparation method of PTFE film
obtained from actual production and operation is studied through experiments.
1. Preparation of PTFE film
1.1 Choice of resin
The polytetrafluoroethylene (ptfe)
film resin used for processing mutual inductor insulation shall be suspended
resin with uniform molecular weight distribution and high crystallinity,
generally with the crystallinity above 98 and molecular weight at 1O ~ 1O.The
resin particle size is about 30t~m. PTFE of this specification is used to
prepare PTFE film for mutual inductor insulation with excellent physical
properties and excellent electrical properties.
1.2
Production process of ptfe film
(1) pretreatment of PTFE raw
material
PTFE suspended fine resin was placed in a constant
greenhouse at 20℃ ~ 23℃ for 24 hours for pretreatment.
(2) ramming and sifting
The pre-treated PTFE suspended fine resin was pounded
and sifted by the rammer to make the resin loose for molding.
(3) the mold
Adopt cold pressing process method, add 10000gPTFE
suspended fine material resin into the mold, press the blank with 20MPpa
molding single pressure on the 100 ton automatic pressure machine, pay attention
to exhaust during the pressing, and avoid the crack of the blank.
(4) sintering
Put the pressed products into high temperature sintering
furnace, to 50.C/h rate of temperature rise to 330℃, insulation
for 3h, then at 30℃ / h rate of temperature rise to 380℃, insulation 1O ~
14h, and then at 30~40℃ / h rate of temperature drop to 320℃, insulation for 3 ~
4h, finally at 50℃ / h rate of temperature drop to 150℃, turn off the
electricity natural cooling to room temperature, take out the product.
(5) rotary cutting into film
The sintered preforms are turned into thin film preforms
by special lathe. The membrane blank is 0.2mm×255mm×300m(thickness × width ×
length).
(6) calendering orientation
After rotary cutting, the directional blank is processed
by the hot roll directional calender (see figure 2), and the directional degree
is 1.8 ~ 2.0. The thickness is 0.1mm directional film, hot roll temperature
control in 15O℃ ~ 180℃.
(7) cutting
Let's make the thickness 0.1mm directional film with
special cutting machine processing into 0.Ptfe film for insulation of mutual
inductor 1mm×35mmx 450 ~ 500m(thickness × width × length).
(8) inspection of packaging
Polytetrafluoroethylene (ptfe) film for insulation of
the processed ct shall be sampled for internal performance inspection, and the
appearance and size inspection of the film shall be conducted at the same time.
PVC film bag shall be used for packaging of the products that pass the
inspection, and inspection certificate shall be attached.
2.2 performance index of PTFE film
In this experiment, PTFE films with different
orientation degrees (orientation degree of material, whose value is the ratio
of the length of film samples before and after heating) are compared with
standard indexes in tensile strength, elongation at break, dc breakdown voltage
intensity and other properties.
Tuesday, August 6, 2019
Process and application of ptfe color film
PTFE(TEFLON) color film is a new type of c-grade insulation material with excellent
comprehensive performance, which is suitable for special requirements, such as
electrical instruments marked by color or wire insulation, etc. It is an
indispensable and important material in radio industry, aviation industry and
cutting-edge electronic science and technology. In the early application of
PTFE plastic insulated wire and cable, it was only limited to the internal
wiring and lead wiring of electrical and electronic equipment in the
high-temperature area of aircraft, ships and other engine rooms in the military
field. With the promotion of preparation technology, PTFE has been gradually
extended to civil electrical and electronic equipment installation lines in
general high-temperature environment. In the past, domestic PTFE films were
mostly natural colors of materials (because PTFE films are not easy to be
colored). In order to distinguish the incoming and outgoing lines of different
transmission signals and make them easy to be distinguished, coating method had
to be used for coloring.
With
the domestic PTFE color film production reaching a certain scale, through
improving the process, the performance indexes of the products are mostly up to
the level of similar foreign products. However, at present domestic PTFE color
film products have obvious deficiencies in color sense and other aspects of
appearance, such as uneven distribution of color spots and other problems. With
the development of the new PTFE color film preparation technology and the
continuous improvement of users' flame retardant requirements for wires and
cables, PTFE color film insulated wires and cables have been applied more and
more widely in high-rise buildings, motor vehicles, computer local area
network, subway and other non-high-temperature environments.
Production process of ptfe color film:
(1)
pretreatment of PTFE resin raw materials
PTFE
suspended fine resin was placed in a constant greenhouse at 20℃ ~ 23℃ for 24 hours for pretreatment.
(2)
pretreatment of pigments
Put the
inorganic pigment in the drying dish of 2O℃ ~ 23℃ for more than 24 hours to be used.
(3) color
A certain
amount of pre-treated PTFE suspended fine resin was added to the rammer, and a
certain amount of pre-treated inorganic pigment was added to mix at high speed
to disperse the pigment evenly, and the resin was loose to facilitate the
molding process.
The dyed
colored PTFE fine material was added into the mold by cold pressing process,
and the 40 000g PTFE colored fine material resin was pressed into the blank on
the 100 ton automatic pressure machine at the 2O MPa molding single pressure.
During the pressing, attention was paid to exhaust gas to avoid the crack of
the blank material.
(5) sintering
Will suppress
good color embryo of high temperature sintering furnace, heating at a rate of
about 5 ℃ / h o to 330 ℃, heat preservation, 3 h,
then rising at a rate of about 25 ℃ / h to about 380 ℃, insulation 10 ~ 14 h, and then cooling at a rate of about 20 ~ 25 ℃ / h to 320 ℃, the heat preservation 3 ~ 4
h, the final cooling at a rate of about 5 ℃ o/h to 15 ℃, o shut electric natural cooling to room temperature, out of color
products.
The sintered
preforms of color products are turned into thin film preforms by special lathe.
The membrane blank is 0.1 mm×100 mm× greater than 300 m(thickness × width ×
length).
(7)
calendering orientation
The color
directional blank after turning is processed by the hot roll directional
calender (see FIG. 3) and becomes directional degree of 1.5 ~ 1.8, thickness
0.05 mm semi-directional film, hot roll temperature control in about 100℃.
(8) trimming
Let's make
the thickness 0.05 mm semi-directional color film with special cutting machine
processing into 0.PTFE color film with 05 mm×90 mm× greater than 10m(thickness
× width × length).
(9)
inspection of packaging
The processed
PTFE colored film will be sampled for internal performance inspection, and the
appearance and size inspection of the film will be conducted at the same time.
The qualified products will be packaged in PVC film bags with inspection
certificate attached.
Monday, July 15, 2019
Development of ptfe lubricating protective oil
PTFE, commonly known as teflon, is a kind
of solid lubrication material with the smallest friction coefficient found so
far. Due to its excellent anti-corrosion and lubrication effect, high and low
temperature resistance, acid and alkali resistance, PTFE has been widely used
in many industrial fields such as aerospace, petrochemical, mechanical and
electronic. PTFE is used in lubricating oil, which can significantly improve
the quality and application performance of oil, so it has been used in oil as
an excellent solid lubricant. Such as DuPont company zonyR f1 uroaddi tives.
Ausimont Technologies of PTFE polymis @ microized powders and American troops
now use the CLP in accordance with MIL -L-63 NATO code: 460 S-758.However,
domestic research and application reports on this kind of products are still
rare. This paper mainly introduces the development of a kind of lubricating and
protective oil containing PTFE.
1.Choice of ptfe lubricants
PTFE is a polymer of tetrafluoroethylene.
It contains a cf-based chemical repeating unit in the molecule, which has no
branches and does not form crosslinks in the whole, so its molecular profile is
smooth. This smooth molecular profile makes it not only has the characteristics
of low friction, but also can be transferred to the dual surface during the
sliding process to form a thin transfer film, which plays a protective role on
the friction interface. It is generally believed that the anti-wear and
anti-friction mechanism of ptfe particles is as follows: under a certain load
state, particles can fill in the flat and concave places, and timely fill in
the damaged parts, so that the friction surface is always in a relatively flat
state; Under a certain load state, particles fall into the structural defects
caused by the matrix material on the friction surface, and a composite layer of
particles and matrix material is formed on the friction surface to improve the
micro-hardness of the friction surface, thus giving the friction surface
certain lubrication function. Under high temperature or high pressure, the
particles react with the metal surface to form metal fluoride, thus forming a
fluoride deposition film on the friction surface, thereby reducing wear. In
addition, due to the hydrophobic effect of PTFE, it also enhances the rust
resistance of oil products.
2.Oil soluble corrosion inhibitor selection
The corrosion of metal under oil film is an
electrochemical corrosion. The experiment shows that the simple oil film is
difficult to play an effective role in protecting the metal, and the single
anti-rust agent is difficult to meet the various application requirements of
oil products, so in order to achieve satisfactory application effect, two or
more corrosion inhibitors are often used together
The basic principle of choosing corrosion
inhibitor in this paper is that it should have obvious anti-rust effect when
the amount of addition is not large, and at the same time the additive should
not affect other properties of oil film. We screened the formulas of more than
10 corrosion inhibitors commonly used in China, such as barium petroleum
sulfonate, and determined the compound corrosion inhibitor system composed of 4
additives, such as barium petroleum sulfonate, magnesium lanolin soap, sben-80
and benzotriazole. Barium petroleum sulfonate has good resistance to salt spray
and moisture and heat. Magnesium lanolin soap can not only prevent rust and
assist film formation, but also improve the stability of oil to some extent
when combined with barium petroleum sulfonate. Benzotriazole is the corrosion
inhibitor of copper, silver and other nonferrous metals, which can effectively
inhibit the discoloration of copper.Sben-80: it is not only an anti-rust agent,
but also has some dissolving and dispersing effects.
Four kinds of means and methods of
technological progress increase the scale of single series and realize the best
scale benefit. Integration optimization and system optimization; Long period
stable operation; Sophisticated large-scale equipment manufacturing, to achieve
efficient and stable operation; Optimize the allocation and recycling of
resources. New catalytic technologies; New separation technologies; Biotechnology;
New materials technology; The compound application of corrosion inhibitors in
information technology has synergistic effect.
Sunday, July 14, 2019
Properties of ptfe film and its composite fabric process
Ptfe films are prepared by biaxial tensile
method. Scanning electron microscope can observe that the films are made of
crisscrossing fiber filaments connected with each other, and the gaps between
fiber filaments form microholes in the films.
There are many micropores on the surface of
the film, about 9 billion micropores per square inch, and the micropores are
mainly distributed in the diameter of 0.8~1 micron. The minimum pore diameter
of thin film micropores is only about 0.6 micron, while the maximum pore
diameter is about 1.6 micron, and the diameter of water vapor is 0.0004 micron.
Thus, water vapor molecules can easily penetrate the pores, allowing the
membrane to function as a moisture permeator. The smallest liquid you can get
your hands on is light fog, with droplets 20 microns in diameter. Therefore,
the membrane also has the function of waterproof. The moisture permeability of
ptfe film is 8450g/m2·24h, which is much higher than that of 3000g/m2·24h when
human body feels comfortable. At the same time, the ptfe film also has good
wind resistance. When the wind pressure rises to the equivalent of wind
pressure of level 10, the permeability of the film is 28.85mm/s, while when the
permeability exceeds 30mm /s, the film loses its wind resistance.
Polyamide (COPA) hot melt adhesive as the
adhesive, the use of flat vulcanizing machine will be fabric, hot melt
adhesive, ptfe film, hot melt adhesive, lining five layers by hot pressing made
of waterproof and permeable laminated fabric. Orthogonal tests of nine
laminating processes with four factors and three levels were carried out. Under
the condition of nine kinds of technology of laminated fabric including
moisture permeability, peel strength, high hydrostatic pressure and
permeability test, finally USES the grey nearly optimal theory to deal with
data process 2 for the optimal process, namely between the fabric and ptfe film
gluing quantity to 12 g/m2, the material between the membrane and the amount of
glue is 24 g/m2, laminating temperature is 140 ℃, laminated time of 10 s, to achieve the
optimal performance of the laminated fabric.
The properties of laminated fabrics made of
four kinds of different fabrics are compared. It is found that the three most
important properties of the composite fabrics, namely moisture permeability,
heat preservation and peeling strength, are superior. Therefore, it is more
ideal to choose brocade and cotton interweave as the layer of waterproof and
moisture permeable laminated fabric. In the use of water-soluble adhesive, the
surface of the material wetting, and other substances between the bond
strength.
In order to further improve the peeling
strength of laminated fabric, ptfe film was treated with hydrophilic
modification. In the process of modification, 1ml Fe Cl3 solution was used to prepare
Fe(OH)3 colloid, which had the best treatment effect on the film. The optimal
solution for the ptfe film
repolymerization of hydrophilic monomer acrylic acid adsorbed with Fe(OH)3
colloid is A3B2C1D2, that is, the polymerization temperature is 70℃, the acrylic monomer
concentration is 20%, the polymerization time is 20min, and the initiator
dosage is 1%.In addition to a slight decrease in moisture permeability,
hydrostatic pressure resistance and permeability rate, the peel strength value
of the laminated fabric after modification was greatly improved and reached the
enterprise standard of 5N/2.5cm.
Sunday, June 23, 2019
Introduction of ptfe welding process
Steel lined ptfe equipment is usually made
with discharge port, feed port, perspective mirror, etc., but how to
successfully apply this kind of pipe port in the complex head intersecting
line, of course, our answer is welding, then how to welding?How to control the
temperature of ptfe welding?Below we tell one by one.
1, ptfe head pipe mouth production
PTFE pipe welding on sealing head to first
of all, we should make PTFE sealing head nozzle, according to the size of the
nozzle diameter steel head and according to certain proportion by using powder
moulding process manufacturing nozzle, 8 hours of sintered under the 380 plus
or minus 5 degrees Celsius, after the completion of the sintering good nozzle
with lathe car to the right size, to the congratulations of PTFE tube at this
moment you have finished.
2, ptfe head opening
Put the extracted head into the steel head,
and use the principle of light transmission to accurately open the head, pay
attention to the ptfe head must be consistent with the steel head, or the final
equipment is prone to bulge, rupture and other potential hazards.
3, ptfe pipe mouth welding
By the first two steps, we can carry out
PTFE welding. Here we know that there are two ways of welding (hot pressure
welding and hot air welding). We will explain them one by one.
(1) hot pressure welding
Before hot pressure welding we should know
the necessary theoretical knowledge, hot pressure welding is a kind of hot
welding, provide sufficient heat and enough pressure.Here, we must ensure that
the welding interface temperature must reach 673.15k and the pressure reaches
1-2mpa. Therefore, in order to ensure the welding, we need to make
corresponding molds to ensure the successful completion of the thermal pressure
welding.When all is done, the FEP film can be welded by pressurizing and
heating the interface between the nozzle and the head.
(2) hot air welding
Similarly, ptfe hot air welding is a kind
of hot welding, which is much simpler than hot pressure welding and does not
require so many molds. After placing the pipe mouth, PFA welding rod and hot
air welding gun higher than 713K are used to preheat PFA first and then place
it on the welding seam for continuous welding.
Note: whether it's hot pressure welding or
hot air welding welding temperature will be higher than the melting point of
ptfe, ptfe is possible under the temperature cracking, produces in the process
of pyrolysis perfluorinated isobutylene and other poisonous gases, so the
welding should be in a ventilation environment, when the condition does not
allow such as the four fluorine lining tank welding in production must use the
fan air supply air flow assurance and wearing a gas mask to ensure security at
the same time.
Thursday, June 20, 2019
What is suspended ptfe and dispersed ptfe?
Due to the different polymerization methods
of ptfe, there are suspension materials (suspension polymerization) and
dispersion materials (dispersion polymerization), namely suspension ptfe,
disperse ptfe, the processing methods of the two materials are also different.
Suspended material (suspended
polytetrafluoroethylene)
Its main forming method is die pressing
method, that is, white powder without a little additive, then die pressing
forming, sintering above its melting point temperature, and then through appropriate
mechanical processing into products, the representative products for the plate,
bar, tube, film four categories.
Dispersion material (ptfe)
PTFE fine powder prepared by dispersion
polymerization method is generally referred to as "dispersion".Because
of the fibrotic properties of this fine powder, especially at temperatures
above 20℃, it is recommended to store, transport and mix the material at 5 ~
10℃.The forming method of this kind of material is to use an auxiliary
agent (usually petroleum ether or gasoline) and powder after mixing in the
environment of 24℃ or more for about 24h (complete the crystal phase change) and then
forming, with the piston extrusion forming, drying, burning.This processing
method is commonly known as paste extrusion, also known as push.
Due to the dispersion of fine powder
particle size, divided into several grades of specifications, different
specifications have different compression ratio characteristics.Compression
ratio of less than 100, generally used to produce raw material and microporous
tape;Low compression ratio of less than 500, used to produce medium and large
specification products;500 ~ 2000 is medium compression ratio.2000 ~ 4400 is
high compression ratio material, this material is suitable for the production
of thin wall thin line, can continuously large length and high efficiency
production.
Identification method: the main difference
is the particle size of the two are not the same.Suspension material is coarse,
dispersion material is fine.
Monday, June 17, 2019
Production process and application of ptfe film
Ptfe film processing equipment
will use a Isostatic Moulding Press Machine, Isostatic Moulding Press Machine production bar,
and then sintering, finally using a Skiving Machine for Skiving.
Ptfe films are mainly divided into two
types: microporous film and turning film.The biggest difference between the two
is the permeability of microporous membrane, which is produced by biaxial
stretching.Turning film is cut out of the lathe, it does not breathe.
I do not know about turning film, know that
it should be used on the seal more.We're going to talk about microporous
membranes.
Polytetrafluoroethylene (ptfe) microporous
film is made of polytetrafluoroethylene resin particles, which is expanded and stretched
to form a microporous film. It can be divided into the following categories:
1. Air filtration membrane
Polytetrafluoroethylene membranes can be
used for atmospheric dust removal, air purification and so on the membrane pore
size can be controlled 0.2 um, porosity can reach more than 88%, and the needle
felt, mechanism of cloth, non-woven fabric, glass fiber and other filter
material with surface phase composite filtering performance of coated fabric,
PTFE coated filter material has high peel strength, air volume, uniform pore
size distribution, etc.As a dust bag or fold type dust removal filter cartridge
installed within the dust removal equipment, will be promptly and efficiently
calculated intercept with micron ultra fine dust, dust removal efficiency can
reach more than 99.99%, the service life for three years, ventilation rate of
up to 3-6 m/min, is currently the world's most advanced air filtration
material, all kinds of vacuum cleaners, air filter, air purification equipment,
the best choice for high efficiency air filter, etc.
Technical parameters are as follows:
Thickness: 5 um - 15 um
Air permeability: 80-100l /㎡•s
Width: 1800 mm or less
Resistance: pa 80 or less
Efficiency: 99.99%
2. Waterproof and moisture-permeable
microporous membrane
Ptfe waterproof moisture permeable
microporous membrane is made and approved by a special process the
bidirectional tensile membrane surface per square inch can reach billions of a
microporous, each pore diameter (0.5 to 0.1 um um) is less than the minimum water
molecules in the mist of the minimum value (20 UN um - 100), the diameter
greater than the water vapor molecules (0.0004 to 0.0003 um um), the water
vapor through the water, and cannot pass, take advantage of the microporous
structure can achieve excellent waterproof and moisture permeable function;In
addition, because the hole is extremely small and longitudinal irregular
bending arrangement, so that the wind can not pass through, and thus has good
wind protection and heat preservation characteristics.Since the advent of the
membrane through continuous improvement, special treatment on the PTFE film,
its fastness and durability greatly improved, after composite with other
fabrics, widely used in the greenwood clothing, medical clothing, leisure
clothing, fire control, chemical protective, antivirus, flooding operation,
such as special protective clothing, outdoor sports clothing, shoes and hats,
gloves and other accessories as well as sleeping bags, tents and other
materials
Technical parameters are as follows:
Thickness: um 20-50 um
Moisture permeability: 16000g/㎡•24hr
Hydrostatic pressure: 6000mm
Extreme uv resistance: 97 highest
Width: 1700 mm or less
G: 5-10 g/m2
It with polytetrafluoroethylene (ptfe) as
raw material, after puffing stretch forming a kind of microporous membrane, the
membrane with a special process combined with on all kinds of fabric and base
material, become a new type of filtration material, the membrane pore size is
small, about 0.2 to 0.5 mu m, uniform distribution, porosity, while maintain
the air circulation, can filter all of the dust particles, including bacteria,
achieve the goal of advanced purification and ventilation, it is widely used in
pharmaceutical, biochemical, microelectronics and laboratory consumables, etc.
Technical parameters:
Thickness width bubble point
1600mm
≥1kg/cm2 (5.3m/s 127Pa)
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