2results about How to "Avoid print failures" patented technology

This utility model relates to the field of printing device technology, and in particular to a portable, trouble-resistant label printer. A portable, trouble-resistant label printer includes a printer body with an inner cavity, within which a paper jamming assembly and a guide groove are disposed. The paper jamming assembly includes: a connecting seat located on one side of the guide groove; a first paper jammer hinged to the connecting seat at a certain angle; a torsion spring, used to generate a restoring force applied to the first paper jammer when the angle between the first paper jammer and the connecting seat changes; and a second paper jammer movably mounted in the guide groove. This solution effectively solves problems such as difficult paper loading, high paper jam rate, severe printing misalignment, and difficulty in cleaning sensors in the prior art, significantly improving the user experience and reliability of label printers.

The invention discloses a polyurethane emulsion for UV (ultraviolet) ink-jet digital printing as well as a preparation method and application of the polyurethane emulsion. The preparation method of the polyether type polyurethane emulsion comprises the following steps: adding polyether polyol, isocyanate, a catalyst and polyfunctional group acrylate into an organic solvent, mixing and uniformly stirring, heating to a first temperature, and stirring for reaction to obtain a polyether type polyurethane solution; and cooling to a second temperature, sequentially adding deionized water, adjusting the pH value, and uniformly mixing to obtain the water-based polyether polyurethane emulsion. The low-polarity polyether polyurethane is selected as a main body material, the polyfunctional group acrylate is introduced to increase the binding force between the ink and the main body, the compatibility among the components can be improved, the leveling property of the UV ink can be improved, a high-quality cured film layer can be formed without additionally adding a leveling agent, the internal stress during UV curing film forming is reduced, and the UV curing film forming quality is improved. Therefore, surface defects such as white points and pinholes caused by shrinkage of film holes in the UV curing process are avoided.