{"id":1276,"date":"2018-06-11T10:05:45","date_gmt":"2018-06-11T10:05:45","guid":{"rendered":"https:\/\/staging8.dynaserverx.com\/murakamiscreen.com\/servicio-tecnico\/archivo-de-boletines\/quien-dirige-el-shop\/"},"modified":"2018-07-25T21:29:39","modified_gmt":"2018-07-25T21:29:39","slug":"quien-dirige-el-shop","status":"publish","type":"post","link":"https:\/\/staging8.dynaserverx.com\/murakamiscreen.com\/es\/quien-dirige-el-shop\/","title":{"rendered":"\u00bfQui\u00e9n dirige el Shop?"},"content":{"rendered":"

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As a company grows an owner may have moved from a labor position to a management position. Gone are the days when screens were prepared correctly. Owner\u2019s look around the shop as they grow and replace themselves with the highest\u00a0qualified candidates available. In today\u2019s tough economy it is rare to hire highly\u00a0qualified screen makers and production management personnel, rather those positions go to recently hired workers who have taught themselves enough about the job to accomplish the tasks. However, as we will see, many techniques and \u2018best\u2019 practices disappear when job positions change within a shop. Often it\u2019s the lack of training that runs the shop. I get the call: \u201cI\u2019ve got some bad emulsion here, it\u2019s falling off\u001e the screen.\u201d A conversation begins, starting at screen making 101, and then progressing to product knowledge. Too often the screen maker was promoted from screen reclaiming and before that he may have been a screen washer. In my shop if you could deal with cleaning plastisol screens for 30 days you passed the test and became a candidate for a better job, often assisting screen reclaiming, or development. As the worker\u00a0progresses he may get to coat screens, then shoot them when the shop gets real busy. His training may have been minimal. The screens look the same as any others but too often the screen room develops habits that lead to poor performance on press.<\/p>\n

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How old is the bulb?<\/strong>\u00a0Most untrained workers don\u2019t know. With new workers it may never dawn on them that the bulb has lost its\u2019 strength long ago. It still works, lots of white light but very little UV light that creates strong screens. This lamp may work for\u00a0plastisol prints, but will breakdown with discharge inks.<\/p>\n

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\u2022\u00a0Exposure Lamp Integrator<\/strong>\u00a0\u2013 A lot of shops don\u2019t even know their exposure lamp has one. They shoot in seconds and never realize changing to units activates the integrator. On some exposure systems changing from units to seconds requires hitting just one button. New workers have no idea on the difference. Units measures light in lumens, and seconds measures time only.<\/p>\n

<\/div>\n
Higher End Tools for Complete Control<\/strong><\/div>\n
Murakami sells the following process tools that can accurately measure the most important<\/div>\n<\/div>\n

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1. Moisture Meter<\/strong>\u00a0\u2013 a great tool to measure screen moisture to determine if your screen is completely dry. Touching the screen to feel if it is dry does not work.<\/p>\n

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2. Thickness Gauge<\/strong>\u00a0\u2013 Measures the thickness of the mesh first, then the emulsion thickness, and then shows\u00a0difference between the two.<\/p>\n

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If there is no difference, or 0% EOM then the thickness of the mesh and emulsion are the same, where the knuckles of the mesh are not covered with emulsion. Typically a 110-T\u2019s fabric thickness is 134 microns, (found in our catalog at:\u00a0www.murakamiscreen.com<\/a>). So if we want 7-10% EOM for a strong screen to print discharge we will need the emulsion and fabric thickness to be 143 microns (7%), which is generally achieved with a 1:1 coat using the dull side of a scoop coater when using Aquasol HV or HVP, the best choice for water base or\u00a0discharge inks.<\/p>\n

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3. Hand Held Microscope with stand<\/strong>\u00a0\u2013 Allows excellent viewing of halftones, emulsion edges, to evaluate the exposure process. Allows skilled employees to show trainees sharp emulsion shoulders, crisp halfones, and vertical emulsion side walls to understand what to look for.<\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row][et_pb_column type=\u00bb1_4″][et_pb_image _builder_version=\u00bb3.0.71″ src=\u00bbhttps:\/\/staging8.dynaserverx.com\/murakamiscreen.com\/wp-content\/uploads\/2018\/06\/ImageCalculator-e1528711301964.jpg\u00bb show_in_lightbox=\u00bboff\u00bb url_new_window=\u00bboff\u00bb use_overlay=\u00bboff\u00bb sticky=\u00bboff\u00bb align=\u00bbleft\u00bb always_center_on_mobile=\u00bbon\u00bb border_style=\u00bbsolid\u00bb force_fullwidth=\u00bboff\u00bb \/][\/et_pb_column][et_pb_column type=\u00bb3_4″][et_pb_text _builder_version=\u00bb3.0.71″ background_layout=\u00bblight\u00bb text_orientation=\u00bbleft\u00bb border_style=\u00bbsolid\u00bb]<\/p>\n

4. Exposure Calculators or Instructions to run a step test<\/strong>\u00a0\u2013 Why? Because it uses your film or vellum. A calculator will be very accurate if you use a 5kw lamp and have a D-max in your image of 3.0+.<\/p>\n

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Murakami Emulsion is designed to be completely exposed and hold all the detail in the art. A lot of workers think that underexposing will create better details. This will create premature screen breakdown, rejects, and poor profit margins. When the screen is wet in development take some white cloth or a paper towel and wipe the inside of the screen in the exposed area, not the image. If there is slime, or emulsion color on the rag the screen is underexposed. With Murakami emulsion it is completely cured when no slime, no color transfer occurs and details are all present. Again a step test can determine the proper\u00a0exposure time to determine these conditions. Here are some recommendations on emulsion selections for textile printing:<\/p>\n