Making Rubber Stamps Using Liquid Polymer

What are Polymers?
 

Tiny molecules strung in long repeating chains form polymers. Why the chemistry lesson? Well for one thing, your body is made of them. DNA - the genetic blueprint that defines people and other living things - is a polymer. Proteins and starches in the foods we eat, the wheels on our skateboards, and even the tyres on our bikes and cars are polymers. In fact, we are surrounded by polymers every day, everywhere we go. Polymers also form one of our recyclables, which is good for the environment.

Polymer Curing - How stamps are made with chemistry!
 

In polymer chemistry and process engineering, curing refers to the toughening or hardening of a polymer material by the cross-linking of polymer chains; this is brought about by chemical additives, ultraviolet radiation or heat. Rubber stamp polymer is supplied as a liquid and is cured using ultraviolet radiation. Although natural sunlight can cure polymer, liquid stamp polymer requires precise exposure to UV light to make rubber stamps.

Polymer Stamps - Make your own stamps without any skills whatsoever!
 

How many times has this been said in the past! Polymer stamp production has always attracted people trying to make a quick dollar out of the process. We have seen salespeople selling briefcase size polymer stamp machines to the unsuspecting stationery store and newsagent owner plus more recently the DIY kits sold over the internet aimed at craft people. If you are serious about stamp production you should be wary of some of the claims made about stamp making using liquid polymer.

Polymer in a bag
 

The most exciting development of recent is a new innovation where polymer is injected into a flat rectangular sealed bag; this new product does away with backing sheets, foam tape and coverlay film normally required for stamp production. Processing times are reduced by about 50% when using these new bags; this reduced labour cost negates the extra cost of the bagged product. The bags are available in a range of sizes to suit production demand. Polymer in a bag has also eliminated the problem of air bubbles during processing; this common objection to polymer stamp making has now been overcome.

Where the Polymer Rubber Stamp Industry is Heading
 

You have two distinct markets for rubber stamps. The first is the traditional business stamp market where stamps are affixed to handles and self inking units. The second market that is growing rapidly is the craft industry; these stamps are affixed to wooden or clear acrylic blocks and used for card making and scrapbooking. Craft stamps such as an artist's range of stamps that follow a theme are traditionally made using the vulcanizing process due to it being more suited to mass production of the same stamp. Nowadays card makers want custom designs and clear see through stamps of which polymer is making some significant inroads into this market. Another problem has arisen where polymer 'jelly' stamps are being sold to the craft industry, these polymer stamps have no structural backing allowing the polymer stamp to adhere to an acrylic block without adhesives. In theory this works well, the problem is that distortion of the stamp can occur as well as the possibility that the stamp can tear.
Thankfully a new clear silicone based product called InstaGrip has solved this problem so a polymer stamp with a sound structural backing can be adhered in the same way, without adhesive.

So where is the industry heading?
Business stamping seems to be just as strong as it always has been, with the introduction of the bagged polymer many more manufacturers will be offering polymer stamps due to the bag's labour saving benefits and the lower entry cost for polymer processing equipment.
The craft stamp industry will see much more polymer in the future for much the same reasons. The demand for custom made stamps through services such as www.stampsearch.com.au here you select craft artwork online and then have that image made into a stamp will help the polymer stamp industry develop in a positive manner.

Robert de Rooy is based in Australia and has been making rubber stamps for over ten years; he also operates InstaStamp manufacturing stamp making equipment for people wanting to enter the rubber stamp making industry.