Fish Feed Extrusion Process with Extruder Machine

The early-stage extrusion processing was mainly used in food processing industry. Since the nineteen fifties, America had started to use this technology for feed processing field, especially for processing pet food and pretreatment of feed ingredients. 

Till the nineteen eighties, it has become the fastest developing technique of feed processing industry in the world, and has started to be applied in each sphere of feeding stuff industry, widely used for dry pet foods, some applications for livestock feed and fish feed. With the unceasing development of technology and the continuous rising of people living standard, the growth of aquaculture must follow the principle of producing green food without pollution, bringing significant attention and lots of intensive study on aqua feed production technology. And there is a consensus that adopting extrusion process to make fish feed is the major means to ensure producing high quality and safe aquatic products for human health, which is also a trend for feed industry progress in the future.

Commercial fish feed extrusion process refers to cook the mixture of feed ingredients under high temperature, moisture and high pressure by means of fish feed extruder within short time, whereby the high temperature is a direct result of friction(dry extrusion) or preconditioning and steam injection (wet extrusion). As a technological treatment, extrusion can make it possible to process a variety of fish feed ingredients, such as soybean, corn, rice, peas and raw materials with high water content. According to the moisture content of raw materials treatment, fish feed extrusion process can be divided into two types — dry type extrusion and wet type extrusion.

Currently, the main extrusion equipment applied in aquatic feed production is single screw fish feed extruder which is also divided into dry type fish feed extruder and wet type fish feed extruder machine. With different parameters and feed formulation, fish farmers and feed plants can make floating, sinking and slow-sinking feed with high quality and nutrition so as to adapt for diverse ingestion requirements of various aquatic animals. Adopting alloy steel as material, FANWAY dry type fish feed extruder has been widely used in small-scale and medium-scale fish farm or feed plants to produce aqua feed and also dog/cat pet feed in virtue of its simple structure and low noise. Other than dry type, the wet type fish feed extruder machine is equipped with a boiler that can add vapor constantly into chamber when extruding feed ingredients, which makes it widely applied to produce floating fish feed pellets for fish farm, aquaculture and even poultry farms.

Source:https://www.sukoptfe.com/fish-feed-extrusion-process-with-extruder-machine

Extruder clogged at mid-print?

The first tip is, and believe, it is a must-have! its a filament dust filter. its pretty simple and you will only need a bit of filament to print, a small sponge and a bit of oil (optional but recommended)

After you print this filter, cut a small block of sponge (a new kitchen sponge is great for it), and put it inside the filter. you can also use the filter to help the filament trough the pfte tube (used on Bowden setups), a few drops of oil will help a lot with the friction for months.

The second tip is even easier, do not keep the plastic away from its bag! but why? three main reasons!

Dust will accumulate on it

Humidity and air pollution will decrease the filament quality over time, it will break easier and this is a huge problem if you use bowden setup with corners

Three: Sun light is known to crack plastic over time, thus decreasing its quality

Third tip: Research the manufacturer on the internet before buying, there are both good and terrible options, price doesn’t means anything! trust me!, once i’ve bought a 60$ filament, and guess what? it was terrible! a 10$ one from china was incredibly best.

Fourth tip: Not always clogging means bad filament, sometimes there is something wrong with the nozzle and the stepper, follow this checklist:

1 > Thermistor!

Check the nozzle temperature!, the thermistor might break or get loose over time, maybe it showing 200C but actually its 160C. check if it is okay. a laser thermometer is great for it. Warning! Loose thermistor are known to cause the printer to get on fire! This is extremely dangerous!

2 > Nozzle Cleaning

2.0 > Heat the extruder to 160C and remove the filament inside,

2.1 > Heat up the extruder up to 300C (don’t worry), and wait for 30 seconds after the temperature gets to 300.

2.2 > load filament in the extruder and try to extrude about 1 meter! (it will take some time), if there are failures you should remove the filament and try again from step 1. until it comes out linearly. Be sure that the extrusion speed is not too fast,

2.3 > If the filament is going out ok, try printing again, it should have worked. if not, you might need to open it and do a harder cleaning, with drill and some needles. try this tip a few times, remove and insert the filament and try to insert again.

3 > All-Metal extruder refrigeration

This is a common issue, the all-metal extruder is composed of three parts, Heat dissipator; Heat-break and the Heated block

The heat dissipator and the heat-break work together to keep the heat only at the block. a bad quality heat-break will let too much heat go up to the dissipator, which will get too hot and melt the filament where it was not supposed to and will make it jam. Make sure you use one with a PFTE core.

There is also the cooler! you need a good quality cooler to help the dissipator, if you don’t use one, this might be the problem.

Source:https://www.sukoptfe.com/extruder-clogged-at-mid-print

PTFE Rod Extrusion Line

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Machine's Features:Automatic;Computerized;Rod Dia Range Min - Max Dia:4mm -500 mm;Production Per Hour in Kg:7-10+;Using for Pre-sintering PTFE material;Suit for new PTFE material or Recycle PTFE material...

 

Rod Extruder Features:

ü  Save time and money.

ü  PLC design and easy to operate.

ü  Long time span. No heating effect during operation.

ü  With latest technology and optimized design.

ü  Min - Max Dia:4-20mm.

ü  Production Per Hour:  7-10+ kg/h.

ü  Automatic operation.

Machine Features:

Teflon PTFE Rods bar Ram Extruder single screw Machine Dia 4-500mm

1.Horizontal Ram Extruder for PTFE rod

2.Ram extruding machine for PTFE rod

3.Using for Pre-sintering PTFE material.

4.Suit for new PTFE material or Recycle PTFE material.


Rod Extruder Features Include:

1. Save time and money, good advantage price offer to customers.

2. Intelligent and easy-to-use operations.

3. Small workplace required due to its compact design and electricity saving machine.

4. Super quality output and the physical properties is adjustable.

5. Precise temperature control, reaches + -1 degree.

6. Long- life, with modern technology and optimized design.

Tip 6 - Skip the non-stick to avoid the dangers of Teflon

Non-stick cookware has been popular because, well, it's non-stick -- very convenient to use and clean. But it also emits toxic fumes when overheated. Environmental Working Group recommends that you choose safer cookware to reduce the risk of inhaling toxic particles when you let that non-stick pan get a little too hot. 

• Why you should skip the non-stick
• What safer cookware to choose
• How to cook with non-stick if you're 'stuck' with it
• Other ways people are exposed to PFCs, and how to avoid them

WHY YOU SHOULD SKIP THE NON-STICK

Non-stick surfaces are metal pans (such as aluminum pans) coated with a synthetic polymer called polytetrafluoroetheylene (PTFE), also known as Teflon, a DuPont brand trademark. Learn more about Teflon and its perfluorinated chemical “family” (PFC’s) in our chemical dictionary.

Toxic fumes from the Teflon chemical released from pots and pans at high temperatures may kill pet birds and cause people to develop flu-like symptoms (called "Teflon Flu" or, as scientists describe it, "Polymer fume fever"). Ingesting particles that flake off scratched non-stick cookware isn't toxic because solid PTFE flakes are inert.

Manufacturers' labels often warn consumers to avoid high heat when cooking on Teflon. But EWG-commissioned tests conducted in 2003 showed that in just two to five minutes on a conventional stove top, cookware coated with Teflon and other non-stick surfaces could exceed temperatures at which the coating breaks apart and emits toxic particles and gases.

See a graphic of what happens at to Teflon at various temperatures.

Health dangers: When you breathe kitchen air polluted with fumes from overheated Teflon, you're at risk for developing flu-like symptoms (yes, "Teflon flu"). The long-term effects of routine exposure to Teflon fumes, and from Teflon flu itself, have not been adequately studied.

PFCs have been found in nearly all Americans tested by federal public health officials. Chemicals from this family are associated with smaller birth weight and size in newborn babies, elevated cholesterol, abnormal thyroid hormone levels, liver inflammation and weakened immune defense against disease.

Environmental hazards: Manufacturing PFCs and the consumer products that contain them poses great risks to the environment and wildlife. The U.S. Environmental Protection Agency says PFCs present "persistence, bioaccumulation, and toxicity properties to an extraordinary degree."

SAFER POTS, PANS AND BAKEWARE ARE READILY AVAILABLE

While there are a growing number of new cookware options on the market, we don't know enough about them to know if they're safe -- even if they're advertised as "green" or "not non-stick." We continue to recommend cast iron and stainless steel cookware as safer options for stove-top cooking, and oven-safe glass for baking. These safer pans might be a little harder to clean, but your health is worth it.

Stainless steel is a terrific alternative to a non-stick cooking surface. Most chefs agree that stainless steel browns foods better than non-stick surfaces.

Cast iron remains a great alternative to non-stick cooking surfaces. Lodge, America's oldest family-owned cookware manufacturer, refers to its cookware as "natural non-stick." Cast iron is extremely durable and can be pre-heated to temperatures that will brown meat and will withstand oven temperatures well above what is considered safe for non-stick pans.

HOW TO COOK WITH NON-STICK IF YOU'RE 'STUCK' WITH IT

• Never preheat nonstick cookware at high heat -- empty pans can rapidly reach high temperatures. Heat at the lowest temperature possible to cook your food safely.
• Don't put nonstick cookware in an oven hotter than 500 degrees.
• Use an exhaust fan over the stove.
• Keep pet birds out of the kitchen -- the fumes from an overheated pan can kill a bird in seconds. 
• Skip the self-cleaning function on your oven. It cleans by heating to high temperatures, which can release toxic fumes from non-stick interior oven parts.
• Choose a safer alternative when buying new cookware.

 Source: http://www.ewg.org

Extrusion Foaming of DuPont™ Teflon® Fluorocarbon Resins

DuPont has developed patented technology for the compounding and processing of fluoropolymer foam resins. The foam process involves the continuous injection of a gas such as nitrogen directly into an extruder filled with molten resin. A specially designed extruder screw is typically utilized to create the polymer gas mixture with an inert nucleating package contained in the resin to help promote cell growth. Foams of up to 60% voids have been demonstrated through the use of this process.

Applications for Melt Processable Perfluorinated Resins

DuPont Teflon® FEP and PFA perfluorinated resins possess melt viscosities low enough for processing in melt extruders. Additionally, FEP and PFA are well suited for extrusion foaming while maintaining their low dielectric constant and low dissipation factors, both necessary for twisted pair and coaxial cable insulations.

Data cables are used in the transmission of electronic signals in a variety of settings and applications. The key electrical properties required for these cables include a low dielectric constant and a low dissipation factor. These properties can be enhanced by foaming the insulation. Depending on the resin used, cables having a foamed insulation allow cable miniaturization, weight reduction of the end product, and the transmission of clear high-quality electrical signals at high signal speeds. 

Foamed cables fabricated from DuPont fluoropolymer resins have become extremely popular in computer manufacturing and installation of network systems. Cables made with DuPont Teflon® FEP or PFA have low-flame and low-smoke attributes. These cables can be routed through plenums and other air handling ducts, reducing the need for the costly installation of electrical conduit.

Structure and Properties of Fluoropolymers

The discovery of PTFE by DuPont occurred in the 1930's, but at that time, the new perfluorinated resin could not be melt extruded. Further research by DuPont into the modification of the polymer architecture led to the development of a series of melt processable fluoropolymers such as FEP, PFA, and ETFE, solidifying DuPont as the world leader in fluoropolymer research. 

The ability to melt extrude these polymers, combined with such characteristics as low dielectric constant and low flammability made FEP and PFA well suited for wire and cable applications. 

Typical Physical Characteristics of PTFE, PFA, FEP, and ETFE

Source: https://www.sukoptfe.com/extrusion-foaming-of-dupont-teflon-fluorocarbon-resins