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275results about How to "Avoid blackening" patented technology

Method for producing organic solderability preservative on surface of circuit board

The invention belongs to the circuit board production technical field and relates to a method for producing an organic solderability preservative on the surface of a circuit board. According to the method of the invention, sand blasting and board grinding procedures are omitted in a pretreatment process, and technological parameters of pickling and micro-etching are adjusted, and therefore, the problem of the smash of fine sands onto a board surface and the problem of high roughness and unevenness of a copper surface when a grinding brush is adopted to perform board grinding can be solved, and the roughness of the copper surface of the circuit board can be moderate and uniform, and the thickness of a formed organic film can be basically consistent with the thickness of etched copper; the circuit board is arranged in an antioxidant cylinder before the production of the organic film, a cylinder dragging plate is adopted to perform cylinder dragging processing at first, so that impurities in an antioxidant solution can be removed, and production parameters can be stabilized, and the concentration of Cu<2+> in the solution is controlled below 15ppm, and therefore, the organic film can be effectively prevented from blackening or color difference of the organic film can be effectively prevented, and yield can be improved; technological methods and parameters in various links are modified, and optimal parameter combinations can be explored, and therefore, the color of the organic film formed on the copper surface can be uniform.
Owner:JIANGMEN SUNTAK CIRCUIT TECH

Method for using alga polyphenol to prevent blackening of seawater shrimps

The invention relates to a method for using alga polyphenol to prevent blackening of seawater shrimps, and the method comprises steps of: 1, selecting fresh algae, washing and draining the algae, and smashing the algae to slurry by a tissue homogenizer for standby; 2, using ethanol with concentration of 80-90% to blend the slurry and the ethanol uniformly to prepare a material liquid, according to the ratio of the slurry to the ethanol being 1g / mL: 6-8g / mL, processing the material liquid in a supersonic wave processor for 2-5 minutes, and then low-fire processing for 2-5 minutes in a microwave oven; 3, putting the microwave processed material liquid into a water-bath shaker at a temperature of 55 DEG C-65 DEG C, carrying out light-free extraction for 0.5-2 hours at a rotating speed of 80-120 r / min, carrying out pumping filtration process, and the alga polyphenol solution containing the alga polyphenol is obtained; 4, immersing the seawater shrimps by using the alga polyphenol solution with concentration of 180-220 ug / mL for 5-15 min, air drying, dishing up, and wrapping the shrimps with a PE preservative film and refrigerating the shrimps at 3+ / - 1 DEG C. The method of the invention has the advantages of simple operation, low cost, and good effect for preventing blackening, can be widely used for preventing the blackening of seawater shell-fish products, can prolong shelf life of the products, promote goods value, simultaneously improve added value of the algae, and has important meanings for increasing economic benefit and promoting fishery synergy.
Owner:ZHEJIANG MARINE DEV RES INST

Auxiliary-heat bamboo bending device

ActiveCN107097315AContinuous and stable deformation forceContinuous and stable outputWood treatment detailsReed/straw treatmentEngineering
An embodiment of the invention discloses an auxiliary-heat bamboo bending device. The device is characterized in that one end of bamboo subjected to preheating bending is fixed through a first fixing component, the other end of the bamboo is fixed through a second fixing component, the second fixing component and the first fixing component are located in the same vertical direction, the bamboo fixed between the first fixing component and the second fixing component is heated while the second fixing component is controlled to move downwardly in a first guide rail through a control component to apply force to the bamboo so as to allow the bamboo to bend in a vertical face. The auxiliary-heat bamboo bending device has the advantages that the defects that an existing fire pillar is simple in style and the bamboo material rots easily and cannot be preserved easily are overcome; the defects that a two-end-fixing mounting manner has requirements on sites, the bamboo material is hard to fix, and overall attractiveness is affected are overcome; the technical problems that the bending point of the bamboo is hard to control in an existing manual bamboo bending method, bamboo bending point deviation is caused or bamboo curvature is not located on the same plane, and production efficiency is low are solved.
Owner:GUANGDONG UNIV OF TECH

Flour mixing device of deep-fried dough stick machine

The invention discloses a flour mixing device of a deep-fried dough stick machine, and relates to the field of food processing. The flour mixing device includes a mixing mechanism, a dough kneading mechanism is arranged at the bottom of the mixing mechanism, a leavening cabin is connected to the right side of the dough kneading mechanism through a lifting machine, an extrusion machine is fixed tothe bottom of the leavening cabin, a discharging mechanism is arranged at the right end of the extrusion machine, a conveying machine is arranged below the discharging mechanism, a composite shaping mechanism is arranged at the middle of the conveying machine, a stretching detachment mechanism is arranged on the right portion of the conveying machine, and a deep-frying device is arranged at the bottom of the right end of the conveying machine. By adopting the flour mixing device of the deep-fried dough stick machine, a manual deep-fried dough stick making process can be stimulated, after wateris automatically added into flour and is mixed with the flour to make dough, the dough is kneaded, leavened, pressed, shaped and then stretched, finally, the dough is deeply fried, manual labor is greatly reduced, the mouthfeel of deep-fried dough sticks is ensured, the deep-fried dough sticks are efficiently and rapidly made, and the flour mixing device is suitable for being used in breakfast stores.
Owner:张乐

Diode lead-out line straightening machine

The invention discloses a diode lead-out line straightening machine, which comprises a primary straightening device, a transmission conveying device, an oscillation orientation precise straightening device, a finished product gathering hopper, a control system, a stander and a supply device enabling the diodes to be sequentially arranged at intervals. The supply device, the primary straightening device, the transmission conveying device and the oscillation orientation precise straightening device are sequentially connected with one another, the oscillation orientation precise straightening device comprises a first straightening roll, a second straightening roll, a material uniformly-distributing mechanism, a reversing device enabling the orientation of lead-out liens of the diodes to be in consistency, a second drive mechanism for driving the first straightening roll to rotate and supplying power to the material uniformly-distributing mechanism and a third drive mechanism for driving the second straightening roll to rotate, the first straightening roll and the second straightening roll make relative differential movement, and a precise straightening passage with an adjustable gap and capable of dropping the diodes processed by the material uniformly-distributing mechanism is arranged between the first straightening roll and the second straightening roll. Through twice screening, the twisting, broken pin and reject phenomenon of the diodes in the straightening process can be avoided, and the phenomenon that the diode misses the straightening also can be avoided.
Owner:张成骏

Emulsion filtration system and method for cold continuous rolling of stainless steel

The invention discloses an emulsion filtration system for cold continuous rolling of stainless steel. The emulsion filtration system comprises a contaminated emulsion tank, a filtering device, a purified emulsion tank, a standing tank, a rolling oil filter, a purified oil tank and a sewage discharge tank, wherein the bottom part of the contaminated emulsion tank and the bottom part of the purifiedemulsion tank respectively communicate with a compressed air pipeline in a workshop; the purified emulsion tank and the standing tank are in communication; the standing tank and the rolling oil filter are in communication; the rolling oil filter and the purified oil tank are in communication; the purified oil tank and the purified emulsion tank are in communication; the bottom part of the standing tank communicates with the sewage discharge tank; and the interior of the standing tank is provided with a first overflow plate and a second overflow plate. The invention also provides an emulsion filtration method for cold continuous rolling of stainless steel. The invention has the following beneficial effects: the emulsion filtration system and method provided by the invention realize sedimentation of large-sized particles and oil-water separation of an emulsion through arrangement of the standing tank, can filter rolling oil rich in small-sized particular impurities by utilizing the rolling oil filter, can remove 90% or more particular impurities, and have high filtering efficiency and good filtering effect.
Owner:WISDRI ENG & RES INC LTD
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