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  • A Beginner's Guide to Rubber: Rubber Vulcanization
    There are many ways to form rubber parts, part 3 of this guide will discuss the remaining more popular processes used in the industry today. As mentioned earlier, the process for turning rubber compounds into usable finished products is vulcanization. There are various types of vulcanization, each producing a unique end product. There is open vulcanization which can take place in hot air or in steam. Vulcanization in hot-air ovens is not very efficient because of the poor heat transfer of hot air. Open steam vulcanization takes place in large containers called autoclaves with a heated jacket and a closed chamber in which articles are placed and the steam is introduced. Saturated steam has better heat transfer which results in shorter cure times at higher temperatures. Open steam curing is typically used in the production of extruded articles such as hoses, cables and strips. Continuous vulcanization is a single-line operation, the shaped uncured product is transferred along a curing medium such as liquid, hot air, steam, microwaves and infrared, and high-energy radiation, the rubber is then cut to produce extruded goods, coated wiring, conveyor belts and flooring. The continuous vulcanization in liquid baths is called LCM (liquid curing method).In this process, the extrudate is run through a suitable hot bath immediately after leaving the extruder. The bath temperature is usually 200-300 degrees Celsius consisting of salt mixtures, polyglycols, silicone oil and metal alloys. Hot-air tunnels can be used for continuous curing of thin articles. Continuous vulcanization in steam tubes is used mainly in the cable industry. Flat rubber goods such as conveyor belts and floor coverings are vulcanized continuously by the Rotocure method. This process involves the use of a wide steel band that presses the article against large, slowly rotating heated drums. Microwave energy is normally used to pre-heat the the rubber parts before it is finished with another medium such as hot air. Infrared is also used in continuous curing in which infrared bulbs supply the heat. High-energy radiation continuous vulcanization is achieved by using gamma radiation from cobalt 60 or electron beams. Cold vulcanization can occur at room temperature by exposure to sulphur monochloride vapors; howeever, this curing agent has been replaced by ultra accelerators that can cause the vulcanization at room temperature. Postcure is a process that may be used on some elastomer types to improve one or more properties of the vulcanizate (the just vulcanized rubber product). It requires circulation in hot-air ovens with a constant fresh air supply and can last several hours at a higher temperature than the press. Finishing operations Many rubber articles require deflashing after vulcanization. This is sometimes carried out by hand trimming using scissors or knives. A widely used method of deflashing involves exposing the rubber parts to low temperature (using liquid nitrogen or carbon dioxide) until the flash is frozen, then the parts are tumbled and the flash is cleaned away, this is called cryogenic deflashing. Some rubber parts may then be painted to give them an attractive finish, or more often, to protect against ozone, oils, acids, chemicals and etc. Quality control is necessary to ensure the quality of the final products. At various stages, incoming materials, in-process materials and finished products will be checked to make sure they are uniform and of adequate quality. Measurement of viscosity, scorch time and cure time are all checked for unvulcanized materials. Vulcanized materials are checked for measurement of the density, hardness, tensile modulus, tensile strength and elongation at break. Quality control of finished products involves visual inspection for defects, dimensional control as well as physical tests according to specifications such as hardness, compression set and density.
    Posted Thursday, November 28, 2013 by: Blog User
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  • Custom Rubber Corp. continues to add new products and customers

    Custom Rubber Corp. continues to add new products and customers.  The website is a catalog of success - successes organized by industry and by application-product usage.  Some of the recent additions are in Automotive, Protective Cases, Rubber to Metal Bonding, Electronics, Round Gaskets and Seals, and more.

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  • More Part Examples Posted

    Custom Rubber Corp. has added two more part examples to the website.  Read on....

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  • Custom Rubber Corp. adds new Videos to YouTube channel

    Custom Rubber Corp. added five new videos to the company's YouTube channel.  All the videos will be used for instructional purposes during the shift-start meetings that take place every day. 

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  • Custom Rubber - Second Place, Educational Outreadh

    Custom Rubber Corp. won Second Place for the ARPM's Educational Outreach Award in late 2019.

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  • "Engineer for a Day" Tour

    On February 22, 2019, Custom Rubber Corp. hosted high school students for a day-long exposure to Engineering.  The event is organized annually by Cleveland State University and Custom Rubber Corp. has participated the last three years.  
    The tour event was also the first time Custom Rubber Corp. used a new audio tour guide system.  After winning a $750 prize associated with the "Educational Outreach" award from ARPM (Association for Rubber Products Manufacturers), CRC purchased a system of 10 receiving headphones and a microphone transmitter.  
     

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  • Custom Rubber Corp.'s Innovative Use of Vision Technology

    John Bellett presented at the Industry Benchmarking conference about Custom Rubber Corp.'s innovative use of vision technology, both for part inspection and also for mold safety. (Photo Courtesy of Creative Technology)

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  • Developing Next Generation

    Custom Rubber Corp. presented at the annual industry Benchmarking conference in Indianapolis back in October about their efforts to attract the next generation of folks to the manufacturing industry.

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  • Rubber News article: Custom Rubber Corp. hosts ARPM Tour

    The October issue of Rubber and Plastics News has a two page article discussing Custom Rubber Corp.'s approach to manufacturing employment and some technological investments the company has made.  The entire article is available here....

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  • Custom Rubber Corp. Tour

    On September 26, 2018, Custom Rubber Corp. hosted a tour of High School students from Warrensville Heights High School.  The students are in an Engineering and STEM class.  The students learned a bit about what makes manufacturing in general exciting and also some specifics about molding rubber.  At the end of the tour, the students were given a project....

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  • Custom Rubber - Building the Next Generation

    Custom Rubber Corp. is facing the same challenges many other companies are facing: Where can we find additional, dedicated employees who have some training?
    At Custom Rubber Corp., there is a movement to do something about it....

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  • Custom Rubber Corp Upgrades Quality Capabiltieis

    Custom Rubber Corp. has added significant quality inspection capabilities that utilize the latest in automated vision inspection equipment.

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  • Great Place to Work

    Custom Rubber Corp. released a new video sharing the experiences of employees.  Potential employees can watch to find out what kind of work environment Custom Rubber offers and see the type of work.  Custom Rubber Corp. is now hiring, $11.85 starting wage for night shift.

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  • Custom Rubber Corp. article in Inside Rubber Magazine

    Custom Rubber Corp. was featured in an article in the most recent Inside Rubber Magazine.  The article discusses the continuous improvement approach that Custom Rubber Corp. is taking with Mill Drills and Safety.

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  • Molded Round Seals / Molded Round Gaskets - How To

    Custom Rubber Corp. just updated and added information to the Round Molded Gasket / Round Molded Seals page.  The information includes the three primary ways to produce a round gasket or seal and what the advantages and drawbacks are to each.  Also discussed are three primary technical issues that are important to selecting the right type of round gasket and/or round seal.

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  • Colored Rubber Molding - How To

    Custom Rubber Corp. added content to its website with a host of information about molding colored rubber.  The information includes five reasons why Custom Rubber Corp. is one of the leaders in molding colored rubber products and four reasons why product developers, engineers, and companies in general should consider specifying a color other than black for their next rubber molded component. 

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  • Custom Rubber Grommets - How To

    When desigining a custom molded grommet, there are a number of things to consider.  Custom Rubber Corp. recently added detailed information regarding the issues or questions that need to be answered and an outline of how to work through the steps.

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  • Protective Case Design How-To

    Custom Rubber Corp. has added detailed, step-by-step information regarding how to design a custom silicone rubber protective case for your electronic device or instrument.

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  • Rubber Bellows Design How-To

    Custom Rubber Corp. added information related to designing molded rubber bellows and molded rubber convoluted boots.  Information is now available on the five steps or questions that designers need to consider when developing a custom molded rubber boot or bellow.

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  • New Look For Molded Rubber Products Website

    We're very excited about the recent launch of our new website. Much of the content is carried over - our old site had excellent illustrations of the types of products we make and customers we serve - but the look and feel of the site is much more up to date. We've included some larger photos showing some of our employees at work and have updated many of the product pictures.

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