For over a quarter century RKS has been developing and manufacturing world-class squeegee grinding machines. Today they have well over three hundred grinding machines sold within the screen printing industry (and many others outside the screen print market), and they are the world leader in providing precise squeegee grinding machines built in Germany. RKS aims to produce the finest squeegee grinding machines allowing for; efficient, fast, affordable, user-friendly, and reproducible ground squeegees for the screen printing marketplace. To our knowledge, RKS is the only manufacturer of squeegee grinding machines worldwide that process daily such a quantity & variety of screen printing squeegees that are shipped "ready to print". RKS engineers and designers are constantly striving & researching for new and more effective ways to rework (aka grind) screen printing squeegees. With more than twenty-five years of experience in the field of "squeegee reworking" one thing is sure: RKS provides the most precise, most economical and the highest quality squeegee blades and grinding equipment.
RKS is the only manufacturer of Squeegee Grinders that are outfitted with a laser positioning guide. Operation is simple; the operator inserts the squeegee blade and clamps it. Then you simply select a grinding program and then the grinding process is fully automatic. With this automatic operation, you are avoiding any possible operator errors, such as grinding off too large of an advance. The RKS Squeegee Grinder with laser positioning combines all proven and known advantages of the RKS Squeegee Grinders. Watch the video herein for more insight.
A diamond-coated double grinding wheel with coarse and fine industrial - diamond coating Alternative: Double grinding wheel with coarse (P120) and fine (P320 or P400) sandpaper
Classic, but still unique and advanced. The dane grinder manual was the first grinder to see production in the early seventies at Groenlund Machine Works. On a current basis new technology has been applied to this classic grinding machine which now also offers an option as dane grinder semi-automatic.
dane grinder manual is a high capacity all-round grinder for all squeegee types and materials. Furthermore the machine is equipped with our unique grinding system that prevents grinding particles from clogging while grinding and gives excellent cooling properties. The dane grinder manual is a proven classic machine with a unique and advanced grinding system, with high capacity and of excellent quality.
dane grinder manual is a grinder easy to handle and operate, and secures a short make ready time. In addition the latest option of a semi automatic machine would assure a more efficient and lower labour intensive operation.
Our squeegee grinder secures the lowest possible consumption of electricity which combined with a minimum of service and maintenance ensures a good economy and a fast return on investment. If you want a squeegee grinder with a unique and advanced grinding system, with high capacity and of excellent quality and at the lowest possible cost, dane grinder manual is the perfect choice for you. Once you have chosen dane grinder manual, we are confident that you will also be a satisfied Dane customer.
Our machines fulfil a variety of needs, but several quality details are recurring features of each machine. Therefore, we have created these quality symbols to be shown for each machine, if it meets our high standards. The symbols are our guarantee to you, our customer.
To achieve a good print result, particular attention needs to be paid to the most important parameters in rotary screen printing. The key factors influencing this printing method are the type of screen plate, the ink, the squeegee and the flow path. The article in this edition looks at the squeegee, because this is the parameter that press operators are best able to influence themselves in screen printing. The important requirements for the squeegee are to ensure the rubber is of the appropriate hardness, to print with the best possible squeegee edge and to find the optimum squeegee position.
In most cases, the squeegee rubber is made of polyurethane (PU, DIN abbreviation: PUR). Polyurethanes are plastics or synthetic resins that, depending on the manufacturing method, can be hard and brittle but also soft and elastic. These different PU properties are reflected in the different hardness grades of the squeegee rubber, which are indicated using the Shore system. Squeegee rubbers with three different Shore hardness grades 55-60, 65-70 and 70-75 are used for rotary screen printing. The lower the Shore figure, the softer the squeegee rubber. The individual hardness grades are also identified by different colours. Shore 55-60 rubbers are yellow or white, Shore 65-70 rubbers are red and Shore 70-75 rubbers are green.
In principle, more ink is transferred by a soft squeegee rubber than a hard one, but a harder rubber is more suitable for text. The screen acts less abrasively on a hard squeegee rubber and it is therefore possible to use it for longer than a soft squeegee rubber before regrinding. The squeegee pressure should always be kept as high as necessary and as low as possible.
Sharp-edged squeegees are a basic requirement for good print results. With a well-defined and coplanar print edge, the screen printing ink is pressed through the screen mesh openings. If part of the squeegee edge is damaged or worn, it is no longer possible to achieve a uniform pressure across the entire width of the squeegee. In other words, the ink is no longer pressed evenly through the mesh, which ultimately leads to flaws in the print image.
The printing edge can be reground manually or using a squeegee grinder (Gallus ID No. 189300). The advantage of the latter is that it removes the rubber evenly thanks to automated and standardised grinding across the entire squeegee width. This ensures reproducible finishing of the squeegee edge, which means that the screen printing squeegee always has the same predefined sharp edge after grinding i.e. it is always of the same quality. This standardises a factor that can affect the print image, minimises press downtimes resulting from printing accessories not being prepared properly and makes it easier to establish the cause of flaws in the print image.
The squeegee's hardness is not only influenced by the actual rubber but also by the support length (= distance from front edge of squeegee to support plate). The longer this length, the softer the edge, which in turn influences the thickness of the layer of ink applied. If the distance is too short, this leads to printing gaps and if it is too long, this results in smearing. Normally, the distance between squeegee and support should lie between 4 and 6 mm as long as the squeegee is prepared properly.
The squeegee's position also affects the print image. The standard position of squeegee holders on all Gallus presses is at an angle of 30 or 60. The squeegee is always ground at an angle of 90 so that the defined settings can be applied at any time. The squeegee should be positioned so as to run centrally in relation to the impression cylinder, as otherwise it is too far back or too far forward in the direction of web travel. To maximise print speeds, however, the squeegee is always positioned 1-3 mm against the direction of travel, depending on the machine system.
If the squeegee is positioned too far back in the direction of travel of the self-adhesive web, pressure is exerted on the transferred print image too late. This results in ink smearing at the rear edge of the print. The ink that has not yet dried in the print image is smeared due to the delayed pressure of the squeegee. If this printing error occurs, the squeegee must be moved further forwards in the direction of web travel.
If the squeegee is positioned too far forward in the direction of web travel, pressure is exerted on the transferred print image prematurely. The result is insufficient ink at the rear edge of the print. The fact that the squeegee pressure is exerted further towards the front of the print image means that the whole of the ink is not pressed through all screen mesh openings onto the substrate. If this printing error occurs, the squeegee must be moved further back in the direction of web travel.
Gallus is happy to support its customers by recommending materials and providing training, service activities and printing assistance. Please feel free to get in touch. We will be only too pleased to help.
Screen printing is a job that requires many tools and supplies, especially for small screen printing businesses. One of the most necessary items needed for screen printing are squeegees. There are several different types of screen printing squeegees for different needs and types of printing.
Some screen printing jobs require a hard blade, which can ensure that the ink spreads completely and evenly. Jobs that require heavier ink deposits would benefit from the use of a harder squeegee blade.
The most common form of squeegees are measured as 70 durometer, also known as medium hardness. These are in between soft and hard squeegees, which makes them ideal for most standard screen printing tasks.
Composite squeegee blades have layers of various durometers. Typically, the printing edge is somewhat low for moving smoothly on the screen. There is usually also a strong, high durometer layer, which prevents the squeegee from bending.
Neoprene blades are durable and are less likely to break than rubber blades, but they arent quite as durable as polyurethane blades. Although polyurethane squeegee blades are the most expensive choice, they are also the least likely to break. They are typically used for longer jobs, or for printing on an automatic or semiautomatic press.
For those screen printing manually, the squeegee handle may make the difference between an easy job and a difficult job. Manual screen printers should seek a squeegee with a durable and comfortable handle. To be able to get your printing jobs done as efficiently as possible, youll need a handle that wont be uncomfortable.
Wooden handles are a popular choice because they can begin to feel warm as they are held. This can make them feel especially comfortable, but there are still some negative aspects of wooden handles. They easily absorb moisture, and can be very tough or impossible to clean. Squeegee blades cannot be changed easily if you are using a wooden handle, so that may present another issue.
Although plastic and aluminum arent the most comfortable materials to hold, cleaning handles made with these materials is very easy. Changing blades with these types of handles is also usually a simple process. If youre concerned about comfort, however, you can always choose one with an ergonomic shape that will easily fit in your hand.
Of course, you can never avoid damage to a squeegee completely. Abrasion from the screen will slowly dull nearly any squeegee, and solvents can also cause damage. Solvent inks or UV inks can significantly limit the usability of your squeegee. All of these things can affect the quality of your printing, so its very important to replace your squeegees as often as needed, and sharpen them when necessary.
You can sharpen blades using a belt sander, grinding wheel, hot knife, diamond wheel, cold cutting blade, or a rotating blade. However, there are many factors regarding how much you should sharpen it, and which tool to use. The simplest method may be to pay an equipment company to sharpen your blade for you.
Overall, there are many things to keep in mind while considering what type of screen printing squeegee youre looking to purchase. Although it may seem very difficult to choose, comparing some good product options may help you make your choice. These are a few screen printing squeegee options you may want to consider.
This 8-inch 70 durometer squeegee is made with a hardwood handle and urethane blade. The urethane material makes this squeegee durable and long-lasting, and the wood handle should allow for a comfortable grip. Because of the durometer gauge on this squeegee, it is probably best for standard screen printing jobs. It also is likely indended for paper use, rather than heavy fabrics.
This Red Baron Squeegee is intended for craft applications and basic screen printing. The design of this squeegee includes dual edges, with one end for fabrics and the other for graphics. Centered in the middle are fingertip grips, so that itll be comfortable enough to hold. The size of this squeegee is 9 by 3 inches, and each package contains one singular squeegee.
Because of the dual sides of this item, you can use it for printing on fabric and paper. However, this may not be the best item for consistent screen printing, as the material will likely not last long. This squeegee is probably more appropriate for a screen printing demonstration or for one-time use.
This 10-inch squeegee made with a nitrile blade is intended for easy fabric screen printing. The rounded edges help push the ink through the screen, and reduce binding while printing. The handles are made with hardwood, which should feel comfortable enough to use consistently.
This 18 inch squeegee is intended for both graphic and fabric printing.The blade is made with rubber, while the handle is made of wood. The straight shape of the handle is suitable for a comfortable grip, and is intended for abrasion and solvent resistance.
This squeegee is gauged at 75 durometers, which makes it appropriate for standard or slightly heavy screen printing. It should be able to handle slightly more ink than a standard 70 durometer squeegee.
Changing blades for this squeegee should also be simple due to the aluminum handle. This squeegee is solvent resistant, and commonly used for manual screen printing. The handle is compatible with 5mm, 7mm, and 9mm blades.
Overall, the Speedball Nitrile Fabric Squeegee 4492 seems to be the best choice for most screen printing. Although the wood handle may be difficult to clean, it should be comfortable to hold and the nitrile blade is durable and would not break easily. Screen printing can be a task that involves a lot of effort ant time which is why using the best squeegee can make a huge difference.
Sulfet Squeegee Grinder is suitable for sharpen for new squeegees or re-sharpen for the worn-out squeegee after long time services. Using the grind Stone wheel all squeegee become good conditions for good quality prints.
Cell production process, the effect of screen printing will directly affect the conversion efficiency of the battery, the printing core is the aspect ratio of the silver paste after printing. Therefore, the screen, silver paste and squeegee must be kept innovative, when the preparation of higher requirements of screen printing
Just ten years, the gate line requirements more and more fine, has been from the initial 60um into the current 30um; followed by the squeegee replacement (as shown below), now SPS-AS-SL is more and more popular!