How to Make Rubber Stamps: Comparing Methods of Manufacture
Vulcanized Rubber Stamps
The traditional red rubber stamp that everybody is familiar with will have been manufactured in a vulcanizing press. The first rubber stamp vulcanizing press was patented in 1890 by Charles Schultze in New Orleans USA. Vulcanizing is today one of the most cost effective methods of making rubber stamps for mass produced stamps. Each batch of stamps is produced using a mould. This method of manufacture is more suited to stamp making where the same moulds are used over and over again. Making custom made stamps with a vulcanizing press requiring ‘once only’ moulds will drive the cost of manufacture up significantly.
Making the mould - before a mould can be made you must have
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Making Rubber Stamps - Creating stamps is a simple process once the mould is made. Raw rubber stamp gum is placed
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Cost of a vulcanizing system is approximately $12,000 AUD
Advantages - Low cost of production for mass produced stamps, good ink transfer.
Disadvantages - Cost of producing master plates and moulds for custom made stamps.
Laser Engraved Rubber Stamps
The traditional raw rubber used
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The depth of the engraving is determined by the laser speed, its wattage and the density of the rubber. For example, a 50 or 100W engraver will engrave the rubber deeper and faster than a 25W machine, which may require a second pass to achieve a similar result. Usually supplied in an A4 size sheet form,
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To assist the engraving process, it is necessary to remove the excess dust which is constantly created by the laser cutting action with an efficient exhaust filtration system. As very few, if any, CO2 laser engraving machines were initially purpose built for engraving and cutting rubber, installing and maintaining an effective dust extraction system pays long term dividends. Mirrors, lenses and any exposed bearing surfaces should be cleaned thoroughly as part of a regular maintenance program. Any neglect in this area will be detrimental to overall trouble free laser operation, as the build up of dust
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Approximate cost of a 25 watt Laser suitable for stamp making is $40,000
Advantages - Production is computer controlled, custom made stamps can be made easily
Disadvantages - High capital investment, maintenance costs and running will be much higher than vulcanizing or polymer methods of manufacture.
Liquid Polymer Rubber Stamps
Converting rubber stamp polymer from a liquid into a solid to make stamps is quite fascinating. Polymer stamps are manufactured between two sheets of glass using precision controlled UV light which passes through a
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The first step in making polymer rubber stamps is to print your images, clipart or text onto Vellum, an almost transparent paper like film.
To produce quality stamp artwork you must use a laser printer, inks from bubble jet printers are translucent allowing UV light to pass where it should not. Water based negatives are easily washed out after being exposed for a few minutes in a UV exposure stamp machine.
Polymer contained in a sachet is now replacing the older cumbersome method of using foam tape to
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The negative of your artwork and polymer sachet is sandwiched between two sheets of glass spaced 2-3mm apart which is then exposed in the machine for a few minutes. Once you have completed the exposure it is a simple process of cutting open the sachet and washing away the excess unexposed polymer before returning the stamp die back to the machine for a 10 minute curing. Once the stamps are cured they can be cut up individually. Polymer sachets are available in a range of sizes up to A4 size.
Processing time is about
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Cost of polymer stamp making machines range from $3,500 AUD for an Australian made unit designed specifically for stamp making up to high end imported units with computer controlled washout for $15,000 AUD.
Advantages - Lower capital investment, polymers make almost clear stamps making them ideal for scrapbooking and card making. Stamp relief can be easily controlled during exposure.
Disadvantages - Early polymers did not accept inks as well as polymers available today, this along with being new technology caused initial resistance to polymer stamps.
Summary
Most large stamp manufacturers have a mix of the above equipment. The unmounted rubber stamp dies produced with any of these manufacturing methods can be
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Topics: Clear Impressions Rubber Stamps |