Sintering Furnace for Moulded Rods/Tubes

Sunkoo supplies drying and sintering furnaces especially for the PTFE processing as well as preheating furnace for Molded rods/tubes.

There is also a furnace available for drying and sintering inline systems for the production of Moulded rods and tubes (development of Sunkoo). This high tech furnace  has an adjustable blind between drying and sintering zone, the lamellas of this blind can be cooled. As these two zones can not be influenced because of the stack affect, the required temperature profile can be well controlled in the drying as well as also in the sintering zone. This sintering furnace is available with different sizes. Herewith the furnace can be adapted to the respective requests and the available space.

1.      Product name,: Customized

1.1.            Chamber size: Depend on customer choice.

2.      Thermostat section

2.1.            Working temperature: room temperature–400℃ Temperature stability : ≤±1degree (temperature meter) Temperature uniformity ≤±3 degree

2.2.            The ambient temperature raises to 400 ℃ in 50 minutes (full load)

3.      Control section (Separate, Independent, stand mounted control cabinet)

3.1.            controller model: XMTA

3.2.            controller brand: China Brand Norwich sea

3.3.            temperature controller function: PID control, automatic temperature control thermostat program

3.4.            heating portion

1)      Heating method: stainless steel heater uniformly arranged around the heating portion

2)      The heating element: stainless steel heat pipe, (304 stainless steel heating pipe, heating pipe , 220V / 2.5KW, U connection.)

3)      Heating power: 54kw

4)      The heating control, heating control two groups/sides.

5)      The ventilation system: made of stainless steel produced by 2.0, about duct hot air circulation. Each heating zone and wind zone relatively independent ventilation system (four air guide) to ensure that the furnace temperature uniformity.

4.      Material:

4.1.            The outer shell is made of 1.5mm cold plate manufacturing high temperature spray paint, color matt light blue color.

4.2.            The liner is made of 2.0mm stainless steel plate

4.3.            The Case for the vertical routinely

4.4.            Locking means for the oven: door locks and hinges alloy steel alloy steel.

5.      Insulation and heat preservation

5.1.            Case insulating material: high temperature aluminum silicate fiber cotton filling.

5.2.            The cabinet insulation layer: thickness of 150mm (body surface temperature of the ambient temperature plus 35 degrees)

5.3.            The sealing material 20 * 20mm high-temperature glass fiber strip seal

6.      Furnace Cabinet making

Inside the oven using models and stainless steel plate welded together. Wall panels with 1.5mm cold plate, set reinforcing internal ribs. Liner made of 2.0mm stainless steel production base and frame with a 10 channel welded

Long-life heating element made of stainless steel heating tube evenly distributed over both sides of the furnace duct using Choucha installation, wiring head out of the top heating plate outer shell, using nut, rigid fixation, will not fall, set top heating wiring shield. Heating element from front to back is divided into three temperature zones wiring.


Extrusion Blow Molding


Extrusion is a shape forming manufacturing process that involves forcing material into a die to make other shapes with that matetial. It’s like play dough. Imagine having play dough and pushing it through one of those tools with all the holes. You end up with play dough spaghetti. This is an example of extrusion. You can achieve a lot of different stock sizes and lengths by extruding. Like play dough.
The actual process involves a lot of math and hard work and a lot of set up. You start off with the material. Metal is typically used when doing extrusion. Then that material is pushed through another piece of stronger metal with a shape cut out of it where the material is forced out, creating that shape.
Extrusion blow molding is perhaps the simplest type of blow molding. A hot tube of plastic material is dropped from an extruder and captured in a water cooled mold. Once the molds are closed, air is injected through the top or the neck of the container; just as if one were blowing up a balloon. When the hot plastic material is blown up and touches the walls of the mold the material “freezes” and the container now maintains its rigid shape.
Extrusion blow molding allows for a wide variety of container shapes, sizes and neck openings, as well as the production of handleware. Extrusion blown containers can also have their gram weights adjusted through an extremely wide range, whereas injection blown containers usually have a set gram weight which cannot be changed unless a whole new set of blow stems are built. Extrusion blow molds are generally much less expensive than injection blow molds and can be produced in a much shorter period of time.

The Differences Between ABS and PVC Plastic Pipes

There are heaps of reasons why mortgage holders and handymen alike utilize plastic pipes in their pipes ventures. Plastic funnels are economical, lightweight and will never erode. ABS, UPVC pipes and PVC are both quite common in the pipe system industry. Their versatile and durable qualities make them an easy and cost-effective choice of material. At first glance, the obvious difference between these two composites is the color. ABS pipes are typically black, while PVC is usually white or cream-colored. Aside from this, it’s hard to recognize any other distinctions between the two plastics.

Plastic Pipe

ABS pipes

ABS is the acronym for Acrylonitrile Butadiene Styrene. This is a strong thermoplastic polymer material that is extremely durable even at low temperatures.

Primary use:

Children’s toys;Kitchen appliances;Instruments;Golf club heads;Headgear;Car bumpers;Canoes;Indoor piping

Appearance & features:

Black in colour;Stronger;Shock resistance;Tough;Rigid;Cost effective;Light

PVC Pipes

PVC stands for polyvinyl chloride. This is, without doubt, one of the world’s most common plastic materials. In fact, PVC is the third-most common synthetic plastic polymer across the globe, behind polyethylene and polypropylene. You can find this material in two basic forms — rigid and flexible.

Primary use

Pipes;Cable insulation;Clothes;Children’s toys;Shower curtains;Kitchen utensils;Car interiors;Drinking water systems;Garden piping.

Appearance & features

White in color; Flexible;Available in specifications like, “40mm PVC pipe” or “20mm PVC pipe”;Strong;Rigid;Cost effective & affordable

This type of plastic is tough, rigid and very cost effective. The one major downfall with ABS in comparison to PVC is that it is more likely to deform if exposed to baking sunlight. For this reason, the material is rarely used outside or above ground.

Which One is the Strongest?

Without question, ABS channels have a higher effect quality than the PVC elective. This is particularly valid at low temperatures. They are likewise a considerable measure less demanding to introduce with a speedy one-stage joining process. On the drawback however, the materials quality can be debilitated when presented to the sun and you may encounter distortion. Henceforth, why you once in a while observe ABS outside!

Impact of rubber & plastic machines in its industry

Innovation– Step by step work makes the process easy which gave birth to the innovation, it can be said as the development generates curiosity which results in innovation; like in plastic and rubber industry, we cannot imagine the phases and types of semi-finished or finished products of plastic and rubber.

Perfection– Machine generally works with 99.99 percent perfect and fast work, which means no error at all, that’s why plastic products or rubber products have perfection in molds and usage.

Manpower– when machines were not introduced then labors uses to call strikes and lockouts a lot because the whole unit depends upon them but know the scenario is changed.

Economy– Using machine is highly economic in nature, which means manpower increase the cost of the product while machine decreases its cost.

Time– when a process is done manually then it takes lots of time while when that process is done with machines then it takes less time comparatively.

Machine revolution changes the scenario of industries a lot, but it affects plastic and rubber industry the most, that’s why I am talking about the impact.

Plastics Manufacturing process & History

Plastics are made up of polymers, but some polymers like biopolymers are not plastics. Plastic materials are being used in day to day life like computers, pen, mobile phones, compact discs, pendrive, and toothbrushes etc.

Plastic is defined as any synthetic or semi-synthetic organic material that can be shaped or molded into any form. Chemical composition of plastics includes chains of carbon, oxygen, sulfur or nitrogen.

Plastics History
History of plastics 
In 1284 naturally made plastic compounds from horn and tortoiseshell were identified

1820 plastic timeline

In 1823, Scottish chemist Charles Macintosh discovered rubber.

In 1845, Henry Bewley produced natural rubber from plant gutta percha

In 1850, first submarine telegraph cable in gutta percha laid between Dover and Calais

In 1862, Londoner Alexander Parkes unveiled first man-made Parkesine plastic compound

In 1869, John W. Hyatt invented Celluloid [colorless flammable material]

In 1872, Hyatt brothers patented first plastics injection moulding machine

In 1880 cellulose nitrate replacing horn as the preferred material for combs

In 1885, George Eastman Kodak patents machine for producing continuous photographic film based on cellulose nitrate.

1900 plastic timeline

In 1908, Jacques E. Brandenberger invented Cellophane [transparent cellulose material]

In 1909, Casein plastics, derived from milk, developed by Erinoid.

In 1909, H. Baekeland created first fully synthetic plastic product called Bakelite

In 1916, Rolls Royce begins to use phenol formaldehyde in its car interiors.

In 1920, Polyvinyl chloride or PVC was created.

In 1925, Plastic term was coined.

In 1930, in this year scotch tape was invented by 3M company

In 1933, Fawcett and Gibson discovered polyethylene material

In 1938, first toothbrush with nylons tufts manufactured.

In 1939, in this year nylon created.

In 1942, Dr Harry Coover discovered Super Glue (methyl cyanoacrylate).

In 1948, Acrylonitrile-butadiene-styrene (ABS) produced.

In 1949, Tupperware material made from low density polyethylene.

In 1949, DuPont invented Lycra product which is based on polyurethane.

In 1953, Lexan plastic material was invented by Daniel Fox.

In 1959 Barbie Doll unveiled at American International Toy Fair.

In 1965 DuPont released products with the trade name of Kevlar.

In 1973, Polyethylene terephthalate beverage bottles introduced.

In 1988, triangular recycling symbols relating to plastics were introduced.

2000 to 2022 plastic timeline

In 2003 Recovinyl [it is a European PVC recycling system] was established

2005 in this year NASA explores the advantages of a polyethylene based material RFX1 [RFX1 used for spaceship construction]

In 2011, vinylplus — sustainability programme established

In 2012 PVC fabric used in the construction of London Olympic venues

2020 PVC products production will reaches to 800,000 tones per year

2022 in this year the FIFA world cup qatar showcase stadium is planning to use super reflective, triangulated PVC fabric to create a zero carbon.

Manufacturing process of plastics
Preparation of raw materials

Preparation of monomer

Polymerization process

Conversion of polymer resins to plastic products

In the process of converting polymer resins to plastic product following steps are involved


Injection molding

Blow molding

Rotational molding


Most of the Plastics at normal room temperatures usually show the properties of flexibility and high resistance of the material to cracking but when the temperature decreases the rapid changes in the properties of the plastics can be viewed as plastics become brittle at low temperature. Low temperature can be more harmful to plastics rather than high temperatures. The failure of the plastic material occurs when the material is not taken into account after considering the low-temperature properties of the plastics.

How Plastics Reacts at different temperatures?

Plastics comprises of long chains of molecules that are joined with each other. The degree of tangle changes with the shape and length of the polymers. The basic way to examine the quality of the polymers is to heat then at high temperature. You will observe that at the time of heating all the molecules will be tangled up, and each particle will form a long chain, but when the polymer is cooled down, the molecules of the polymers get stacked one above the other and affects the shape of the polymers. Similarly, the long chains in most of the polymers at moderate temperatures are slip over one another and the resistance of the material to crack becomes strong. This state of the polymer is considered as Rubbery.

Testing Machines for Determination of Different Temperatures

· Ultra-Low Deep Freezer — The testing device is used to create extremely low temperatures inside the chambers that help to analyze the properties of polymers and to measure the behavior of different types of plastics.

· Humidity Test Chambers — The instrument is used to determine the quality of the products at varied temperatures. The device creates both high and low temperature inside the laboratories to measure the effect of fog and humidity on the physical, chemical and mechanical properties of the materials.

The manufacturers in polymer industries make use of high-quality testing machines to test the quality of the polymers at low and high temperatures such as ultra-low deep freezers, humidity test chambers, muffle furnace, and many more. These testing instruments are used by the manufacturers in order to assure the quality of the products to end customers and also to enhance the quality of products to enhance the working life of the product. The technique of quality testing is followed to enlarge the list of satisfied customers. Presto, being one of the renowned manufacturer and suppliers of testing devices manufactures a wide range of testing machine to determine the effect of low and high temperatures on polymers. These testing machines are designed keeping in mind the standards that are introduced by various standardization authorities such as ASTM, ISO, BIS and many more.

The advantages of the extrusion blow molding

Molding Machine are those which are used to make shapes out of materials such as plastic, rubber and metal. There are a lot of different techniques for molding materials. The Stretch Blow Molding Machine techniques used is thermoses and thermoplastics and these change the nature of the plastic that has been processed through these techniques. Thermo sets make the plastic retain the shape that it has been molded in. Once you try to change it, you will have to melt it and in this process, this plastic will burn and become useless. The molded thermoplastics are made in small pieces that make their transportation easier and then melted together to make a pool out of it after which it can be given the shape of anything that the manufacturer wants to produce.
Molding Machine
1)The cost of the extrusion blow molding machine is cheaper than that of injection molding machine, about one third of the injection blow molding machine.
2)On blowing molding, the preform is formed under low pressure through the extrusion equipment heat, in this circumstance, the residual stress of the products is small. With its good performance in tensile, impact, bending and other variety of environments, It have the good function.
3)In the injection blow molding, the plastic melt at high pressure (15–140Mpa) through the mold runner and gate, which will lead to uneven stress distribution.
4)The moleculars of blowing mold grade plastics(e.g,PE)are more than that of injection mold.
Such blow molding products have a high impact toughness and high resistance to environmental stress cracking performance, which is very favorable for the large-capacity production of plastic bottles.
5)The wall thickness of the blow molding products can be very thin while the injection molding products cannot be so thin as blowing mold process.
6)Blow molding process can shape complex and irregular products, but the injection molding process has to produce two or more pieces, and then stick it by the glue or bond it or using ultrasonic welding.