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Sun, 22 Apr 2012 10:41:00 PDT Thomas Zickell
http://feeds.feedburner.com/mtipolyexeHere at MTI Polyexe we want to wish you a happy Earth Day. We understand as a blown film extrusion manufacturer, silicone coating manufacturer and release liner... MTi Polyexe, we are proud to provide quality services and manufacture specialty products. We offer services including but not limited to: Film slitting, cutting, converting, and rewinding...Read More
Mon, 12 Mar 2012 02:37:00 PDT Thomas Zickell
http://feeds.feedburner.com/mtipolyexeBlown Film Extrusion (function(){ var hsjs = document.createElement("script"); hsjs.type = "text/javascript"; hsjs.async = true; hsjs.src =... MTi Polyexe, we are proud to provide quality services and manufacture specialty products. We offer services including but not limited to: Film slitting, cutting, converting, and rewinding...Read More
Sat, 31 Dec 2011 12:29:00 PST Thomas Zickell
http://feeds.feedburner.com/mtipolyexeMTI Polyexe Corporation wants to thank you all for giving us a great 2011. We look forward to providing more innovative products and high quality service you... MTi Polyexe, we are proud to provide quality services and manufacture specialty products. We offer services including but not limited to: Film slitting, cutting, converting, and rewinding...Read More
Thu, 03 Nov 2011 09:30:00 PDT Thomas Zickell
http://feeds.feedburner.com/mtipolyexeMaking Plastics To make plastics, chemists and chemical engineers must do the following on an industrial scale: Prepare raw materials and monomers Carry out... MTi Polyexe, we are proud to provide quality services and manufacture specialty products. We offer services including but not limited to: Film slitting, cutting, converting, and rewinding...Read More
Thu, 08 Sep 2011 01:18:00 PDT Thomas Zickell
http://feeds.feedburner.com/mtipolyexe MTi Polyexe Corporation would like to thank every one for taking the time to visit our site. from mtipolyexe on Vimeo. MTi Polyexe Corporation would like to... MTi Polyexe, we are proud to provide quality services and manufacture specialty products. We offer services including but not limited to: Film slitting, cutting, converting, and rewinding...Read More

MTi Polyexe, Blog, blown film, base films, release liner, plastic film, silicone coatings, silicone release liner, custom coating converting, plastics films, Blown Film Extrusion

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How Plastics Work

 

Making Plastics

To make plastics, chemists and chemical engineers must do the following on an industrial scale:

  1. Prepare raw materials and monomers
  2. Carry out polymerization reactions
  3. Process the polymers into final polymer resins
  4. Produce finished products

First, they must start with various raw materials that make up the monomers. Ethylene and propylene, for example, come from crude oil, which contains the hydrocarbons that make up the monomers. The hydrocarbon raw materials are obtained from the "cracking process" used in refining oil and natural gas (see How Oil Refining Works). Once various hydrocarbons are obtained from cracking, they are chemically processed to make hydrocarbon monomers and other carbon monomers (like styrene, vinyl chloride, acrylonitrile) used in plastics.

Next, the monomers carry out polymerization reactions in large polymerization plants. The reactions produce polymer resins, which are collected and further processed. Processing can include the addition of plasticizers, dyes and flame-retardant chemicals. The final polymer resins are usually in the forms of pellets or beads.

Finally, the polymer resins are processed into final plastic products. Generally, they are heated, molded and allowed to cool. There are several processes involved in this stage, depending upon the type of product.

Extrusion: Pellets are heated and mechanically mixed in a long chamber, forced through a small opening and cooled with air or water. This method is used to make plastic films.

Injection molding: The resin pellets are heated and mechanically mixed in a chamber and then forced under high pressure into a cooled mold. This process is used for containers like butter and yogurt tubs. (Custompart.net has a great lesson on injection molding.)

Blow molding: This technique is used in conjunction with extrusion or injection molding. The resin pellets are heated and compressed into a liquid tube, like toothpaste. The resin goes into the chilled mold, and compressed air gets blown into the resin tube. The air expands the resin against the walls of the mold. This process is used to make plastic bottles.

Rotational molding: The resin pellets are heated and cooled in a mold that can be rotated in three dimensions. The rotation evenly distributes the plastic along the walls of the mold. This technique is used to make large, hollow plastic items (toys, furniture, sporting equipment, 1928726 75septic tanks, garbage cans and kayaks).

Freudenrich, Ph.D., Craig.  "How Plastics Work"  14 December 2007.  HowStuffWorks.com. <http://science.howstuffworks.com/plastic.htm>  03 November 2011.

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