39results about How to "High printing density" patented technology

A printing apparatus and a print control method can obtain excellent ink discharge without reducing the life of a printhead for image formation using plural sizes of ink droplets. Unop printing by discharging ink from an ink-jet printhead, having plural printing elements capable of discharging ink droplets in plural sizes, to a print medium, the number of concurrently-driven printing elements is counted corresponding to each respective size of the plural sizes, based on input print data, then a drive pulse applied to the concurrently-driven printing elements corresponding to the respective size of the plural sizes is determined based ont he result of counting, and the drive pulse is applied to the concurrently-driven printing elements.

To provide: a black compound which is for use in ink-jet recording or writing utensils, is excellent in ozone resistance, light resistance, moisture resistance, and color rendering, and gives a recording fluid having satisfactory storage stability; and an ink composition containing the compound. The black compound is a trisazo compound represented by the following formula (1) or a salt thereof. (1) [In the formula (1), R<1> and R<2> each independently represents hydrogen, carboxy, sulfo, hydroxy, a C1-4 alkyl, C1-4 alkoxy, or sulfo group optionally substituted by C1-4 alkoxy, an optionally carboxylated C1-4 alkoxy group, etc.; and A represents phenyl or naphthyl (provided that the phenyl and naphthyl groups may be substituted by halogeno, carboxy, sulfo, sulfamonyl optionally substituted by alkyl or phenyl, nitro, etc.)].

The invention relates to a thermal printing head, in particular to a thermal printing head that a high-heat-conductivity interlayer is added into a base layer. The thermal printing head is characterized in that the high-heat-conductivity interlayer is added into the base layer of a thermal printing head base plate; the heat conductivity of the interlayer is greater than 20W/mK; an external lead is arranged in the interlayer. When the thermal printing head is required to be provided with a rapid heat dissipation property, the lead of the interlayer is connected with a base platform of the thermal printing head, so that the heat dissipation efficiency of the base layer is improved; when the thermal printing head is not required to be provided with the rapid heat dissipation property, the lead is suspended and is not connected, then the heat dissipation velocity of the thermal printing head depends on the heat conductivity of the base layer. The thermal printing head has the advantages that the heat dissipation effect is good, the switching is convenient, and high/low speed product switching requirements can be met.

An inkjet ink comprising a colorant, a water-soluble ester or amide of pyrrolidin-2-one carboxylic acid, and water. An inkjet printing method is also disclosed.

The invention relates to environment-friendly renewable super-light printing lamp box cloth which is composed of polyvinyl base cloth, a base painting agent layer 3 and an ink-absorbing painting layer 4, wherein the polyvinyl base cloth is composed of a polyvinyl weaving cloth 1 and a polyvinyl pouring film layer 2 on the front surface of the polyvinyl weaving cloth 1; the base painting agent layer 3 is arranged on the front surface of the polyvinyl base cloth; and the ink-absorbing painting layer 4 is distributed on the base painting agent layer 3. A preparation method comprises the following steps of: (1) adopting polyvinyl plastic grains, drawing, weaving and pouring polyvinyl, thereby obtaining the polyvinyl base cloth; (2) coating base painting agent on the front surface of the base cloth, drying, and then coating the ink-absorbing painting layer; and (3) slitting, rewinding and checking, thereby obtaining an end product. The ink-absorbing painting layer is prepared by adopting pure acrylic emulsion, polrvinyl chloride emulsion, calcium carbonate, bubble-restraining defoamer, silica gel, titanium dioxide, wetting agent, brightening agent, n-butyl alcohol, sodium chloride and multiple parts of ammonia water at a certain weight ratio. The weaving cloth of the environment-friendly renewable super-light printing lamp box cloth provided by the invention is made from polyvinyl and the environment-friendly coatings of pure acrylic emulsion and polrvinyl chloride emulsion are selected for the painting layer, so that the environment-friendly renewable super-light printing lamp box cloth has the advantages of light weight, environmental friendliness, renewability and the like.

Disclosed is an aqueous ink for inkjet recording which is excellent in print density when printed on plane paper and the like. Also disclosed is an aqueous dispersion used for such an ink. Specifically disclosed is an aqueous ink for inkjet recording which is composed of an aqueous dispersion for inkjet recording containing a coloring agent and a metal oxide secondary particle wherein a plurality of primary particles are linked. In this aqueous ink for inkjet recording, the metal oxide is composed of at least one substance selected from the group consisting of silica, titanium oxide and cerium oxide.

The present invention relates to a water-based black ink composition comprising a water-soluble black dye (A) exhibiting ozone fastness and a condensate compound (B) of 4,4'-dinitrostilbene-2,2'-disulfonic acid and aminobenzenes or a reduction product (C) thereof. Said ink composition is suitable for use in ink-jet recording, and realizes neutral hue and black color of high printing density. Further, a printed matter obtained is excellent in ozone gas fastness, light fastness, moisture fastness and color rendering properties. Still further, storage stability as a recording liquid is excellent.

The present invention aims to provide an ink jet black ink which can improve weatherability, optical density and sticking recovery property of nozzles of a recording head. According to the present invention, an ink jet black ink is provided which comprises at least a coloring-material and a water-soluble organic solvent, wherein the coloring material is a compound represented by the following general formula (I) or a salt thereof, and the water-soluble organic solvent is a water-soluble organic solvent having a relative permittivity of from 30.0 or more to less than 70.0 at 20 DEG C and capable of dissolving the compound represented by the following general formula (I) or a salt thereof, by 1.0 mass % or more at 25 DEG C, and is in a content of 50.0 mass % or more with respect to the total content of all water-soluble organic solvents contained in the ink jet black ink.

An azo compound and an ink composition containing the azo compound are used as inks for ink jet recording and have excellent gas (ozone) resistance when recording is done on special ink jet paper. The azo compound is represented by formula (1) or a tautomer thereof, or a salt of these. In formula (1), R¹ represents a C1-C4 alkyl group, R² represents a cyano group, R³ and R⁴ each independently represent a C1-C4 alkoxy, R⁵-R¹⁰ each independently represent a group represented by formula (2), and R¹¹-R¹³ each independently represent a nitro group. In formula (2), R¹⁴ is an anilino group, and R¹⁵ is a mono- or di-C1-C6 alkylamino group

Black ink compositions are provided. First embodiment contains a water-soluble long-wavelength dye L and a water-soluble short-wavelength dye S, in which the water-soluble short-wavelength dye S has 3 or more azo groups per molecule and a naphthalene skeleton. Second embodiment contains a water-soluble short-wavelength dye S whose absorption spectrum in aqueous solvent has a maximum between 440 nm and 540 nm and a half-band width of 90 to 200 nm and a water-soluble long-wavelength dye L whose absorption spectrum in aqueous solvent has a maximum between 550 nm and 700 nm and a half-band width of 100 nm or more. Third embodiment contains water, a water-miscible organic solvent, and a coloring material, in which C. I. Direct Red 84 is contained as a water-soluble short-wavelength dye S.