Rubber & Tyre Machinery World

Info on Equipment And Suppliers


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Mixing Mill – A Story Of Woes to Wows

Two-Roll Mixing Mills have been in existence since the time mixing of rubber started for various applications. It is still a sacred machinery for the rubber processors. Hence, we had to think thrice or even more before we decided to write a feature on this machinery in our digital publications.

The theme ‘Mixing Mill: A Story of Woes To Wows!!’, I think, is a true reflection of what this popular rubber machinery has morphed into. Modern mixing mills are rich in features, safe and automated as compared to ancestors. (I think you will agree that our edition’s cover page sums up this contrast well!).

Please click on the below image to go to the digital edition of this special supplement.

Download PDF here

Our previous issue of a concise Knowledge On-The-Go Special Supplement to give you useful information in a concise and timely manner was a success with some exciting reviews. Thanks to each one of you – our readers and advertisers.

I hope you will find this edition too informative and interesting. Please do let me know.

(Disclaimer: The pictures and statements in our special supplements including Know Your Supplier editions are shared with us by the respective companies and/or sources are mentioned appropriately. Rubber Machinery World does not independently verify them nor will vouch for their genuineness that they share with us, hence will not be liable for any misrepresented data)


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If you are an equipment supplier and would like your organization to be promoted on Rubber Machinery World, please see the opportunities on Partner Me or Contact Me at rubbermachineryworld@gmail.com for your customized offering.


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An Introduction to Rotocure

A Rotocure is a shortened name of Rotary Curing Press. This machinery is designed for the continuous vulcanization of technical rubber products.

So, if you are into manufacturing of rubber belts, roof covering, rubber belts with textile inserts, sealing plates, membrane and ship textile, conveyor belts, flat belts, floor covering, etc you would have heard of this equipment (if you are not yet using one in your production line).

As a technical rubber goods producer, vulcanization is critical to your manufacturing. In an earlier post, I had introduced you to Autoclave for vulcanizing of products that you cannot achieve on a standard press-based compression molding process. You install a Rotocure to create continuous vulcanization process where the sheet is heated and vulcanized.

While every technical rubber goods manufacturing plant may not have a Rotocure, those who do have one positions their rotary curing press after the calendar.

Rotocure Line:

A typical Rotary Curing Press Line consist of following component machines – A Winding Let-off Unit, Rotocure, Cooling Unit, Equipment fo edge trimming of product and a Winding-up equipment.

Rotocure Image Collage

Rotocure Line: A Collage of Individual Images From The Web

From Winding Let-off Unit, your semi-finished calendered rubber material is led on to the lower roll and from there into pressing space between the heating drum and thrust pressing belt, where it is pressed and vulcanized.

Operating A Rotocure:

Your main vulcanizing machine is always the Rotocure in the set-up and consists of a large, steam-heated, revolving steel drum. This is partly encompassed by an endless steel band. The steel band encompasses approximately 2/3 of the circumference of the drum through the action of two conducting rollers and a tensioning pulley. The drum is heated by means of steam to a temperature of 150 – 200°C. In addition, there is a heating plate bent round approximately half of the surface of the drum and which gives some additional heat, but primarily it prevents loss of heat.

When you operate a Rotocure Equipment, you need to ensure that all the various parts work in precise alignment. It is  crucial for you to maintain all process parameters in their correct tolerance. Because a slight change in the heated roll or in the steel belt that are both in charge of the smooth vulcanization of the sheet can cause your sheet to be unevenly vulcanized. This leads to irregularities and subsequently rejection of your end-product.

Your calendered rubber material is placed between the drum and the band at the lower roller. With the aid of the tensioning pulley, the band is strained so that a pressure (say approximately 0.3 MPa) is obtained between the band and the drum.

Rotocure - Pelmar

A Fully Refurbished Rotocure From Pelmar Engineering, Israel

The linear speed of this drum can vary from a 0.04-200 m of cured material per hour, all depending on your material’s thickness and rate of vulcanization.

The drum, which is interchangeable, can have completely smooth or patterned surfaces and normally has a diameter of 700-1500 mm and a width of between 1200-2500 mm.

For a normal speed range of 5 – 50 metres/hour and a contact length against the drum of 3 minutes, you may achieve a curing time between 4 – 35 min for your specific compound.

As a user, your will quickly realize that the main advantages of a well-manufactured and correctly operated rotary curing press (or rotocure) machine are its high hourly output, long lifespan, low energy consumption and high reliability.

On the other hand, you could be challenged by the limitation of your product thickness and the pressure sought during vulcanization.

As is normal with other categories of rubber machinery, you get both New and Used Rotocure’s in the market. When you shortlist your suppliers, you could also discuss with Pelmar Engineering Ltd for Used Rotocure or Pracsol Chemicals And Machinery for New Rotocure – more of their details on this site is in our interviews section.

Summarizing, a Rotocure is an important rubber machinery if you are into manufacturing of technical rubber products. I look forward to your thoughts on this continuous vulcanizing machine.


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How To Select Your Rubber And Tyre Machinery? Insightful Advices From 6 CEO’s

“How To Select Your Rubber And Tyre Machinery?”

This subject question could have volumes written in theory. But today we focus on what the CEO’s advise, distilled down from their experience, expertise, and wisdom.

Your equipment supplier ecosystem includes New Manufacturers, Rebuilders, OEM Suppliers, Pre-Owned Machinery Suppliers and Agent representatives.

So I asked all the CEO’s the same question to give you a true perspective.

“What would you advice on machinery selection to buyers and users of rubber and tire equipment?”

The different views they offered here are not only insightful, they are pertinent, prudent and practical.

Read on in our Special Supplement here….

This special supplement is one of our efforts to give you useful knowledge on-the-go in a concise and timely manner. This topic based micro-editions is in addition to our other initiatives like ‘Know Your Supplier’ that provides you information on the machinery supplier ecosystem.

Watch Video Version of this supplement on YouTube or Download Full PDF Here.


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If you are an equipment supplier and would like your organization to be promoted on Rubber Machinery World, please see the opportunities on Partner Me or Contact Me at rubbermachineryworld@gmail.com for your customized offering.


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Practical Solutions On Equipment Simplified – A Know Your Supplier Special

At Rubber Machinery World, we understand your information requirements. Our effort on this portal to share authentic information to help you source your machinery wisely remains incomplete without notes on equipment suppliers from whom you source your rubber and tire equipment.

Hence, ‘Know Your Supplierseries is one of our advertorial initiatives to bring to you information on the machinery supplier ecosystem – Manufacturers, OEM Suppliers, Machine Rebuilders, Used and Pre-Owned Equipment Buyers & Suppliers, and Agents.

In Know Your Supplier editions, we cover an equipment supplier’s Competency, Capacity, Commitment, Culture, Communication, Market Presence, Technology, Solutions, amongst other details that you seek; so you know these organizations better and reach them quicker.

In this post, I introduce you to an equipment supplier based in India but wired globally. Read on to know why.


Pracsol Chemicals & Machinery is into trading of Machinery, Raw Materials and Chemicals since 2007 and is growing in reputation in machinery business. We understand from our conversation with Harish Nene, Chief Executive, that in the last 4 years they have secured landmark orders for Used Machinery from Indian Rubber and Tyre industry.

Pracsol is now fast building on this rising confidence and customer trust to extend practical equipment solutions to the industry in new machinery as well.

Flip through this Special Edition using the link – http://is.gd/UHPT5U

In this conversation, Harish Nene outlines on a wide array of his business aspects right from the genesis of his company name to his experiences in rubber and tyre industry, partnership with JM Machinery USA, recent successes and new products on the anvil. Harish also informs us the unique service proposition Pracsol offers to their customers, their competence and comprehensive range of machinery offered to buyers.

I reproduce for you a few snapshots of our conversation here. (For full story, please do read and download here, this special edition of Know Your Supplier)

  • Pracsol is a strange name. What is the story behind this name?

Pracsol is derived from the words ‘Practical Solutions’. Through my experience of last 20 years in International Business, I would state that solution for a problem is possible if looked at it practically not by just following procedures.

Pracsol Logo

  • Having started in 2007 how has been your experience so far in this industry?

Business Ethics, Honesty, Transparency and Hard work is important. Customers who do business with me recognize that they can expect these from me and have helped me succeed in the rubber and tyre industry. I also have good support from my principal company. This makes things simple and gives me time to focus on delivering value to customers. From my last 7 years experience, I would opine that doing business with Private Companies is easier than doing business with Public Limited Companies.

  • Purchasing machinery is a major investment for most buyers and they would need technical inputs and customization. What level of pre-sales support do you offer?

We provide all the important technical details about the machinery with photographs. Through JM Machinery, we can aid in design and engineering from concept thru completion of the desired machine. If the customer insists on Physical Verification Report then physical verification is carried out by our principals’ engineers and a report is provided. The client has the liberty to visit for physical verification if the machines are available at our warehouse in USA.

  • Are you launching any new products?

We are targeting the rubber industry in Europe & USA to export our range of new machinery from India. We have recently bagged an order to design, manufacture and supply a NEW BATCH OFF for Europe. This is expected to be despatched by end of September 2015.

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For full conversation and other details of Pracsol, access this special edition of Know Your Supplier in PDF here.

Meanwhile, here is a quick overview of industries covered by Pracsol and Harish Nene’s contacts if you would like to reach him quickly.

Pracsol-Small-Ad


Know Your Supplier is an advertorial initiative of Rubber Machinery World and all information are as provided by the supplier. If you desire to know more, kindly reach out on the contact details provided or write to me stating the additional details you seek on this supplier.

And if you would like your organization to be promoted on Rubber Machinery World, please see the opportunities on Partner Me or Contact Me at rubbermachineryworld@gmail.com for your customized offering.