75results about "Slime-control agents addition" patented technology

The present invention relates to a process for the preparation of a solution comprising a first peroxy acid comprising performic acid and a second peroxy acid, said process comprising forming a carboxylic acid solution comprising a first carboxylic acid comprising formic acid, a second carboxylic acid and hydrogen peroxide, wherein the amount of formic acid is from 0.5 to 20% by weight of the amount of the second carboxylic acid, and allowing the components to react to form a solution comprising performic acid and said second peroxy acid, the amount of peroxy acids being at least 5% by weight. The invention also relates to a storable solution comprising performic acid and said second peroxy acid. The solution can be used as a disinfecting agent for controlling micro-organisms.

The present invention provides a method for the removal of biofilm, flocculent bulked sludge or bulked biologically active sludge from an aqueous system. The method involves adding one or more chlorinated hydantoins, such as dichloro- or monochlorodialkylhydantoin, to the aqueous system. Alternatively, the chlorinated hydantoin may be formed in situ by adding a chlorine source and an alkylated hydantoin separately to the aqueous system. The invention is particularly advantageous because of the outstanding photostability of the chlorinated hydantoin solutions even when exposed to sunlight.

The invention is directed towards methods and compositions for identifying the specific microorganisms present in a particular potion of a papermaking processes. The method involves obtaining a sample from the process which is such that little or no live examples of the microorganism remain. However because DNA from the organisms is still present, an analysis which identifies portions of DNA specific to the particular organism will correctly identify the microorganism present. This allows for analysis of infestations present on felts or paper sheets which typically no longer have many live microorganisms on them when samples are taken for analysis.

[Object] To provide an anti-soiling agent compound that can sufficiently prevents adhesion of pitch to a dry part region.[Solution] The present invention provides an anti-soiling agent composition for preventing pitch contamination in a dry part of a paper-making process, and the composition has a polysiloxane compound represented by the following formula (1), wherein the number of amino-modified groups per molecule of the polysiloxane compound is in a range from 0.5 to 5.[wherein, a substituent R1 represents a methyl group or an amino-modified group represented by the following formula (2), and the number n of repeating siloxane units represents an integer in a range from 50 to 1000, andwherein, each of a substituent R2 and a substituent R3 independently represents an alkylene group having carbon atoms of 1 to 6, and the number m of repeating amino-alkylene units represents an integer in a range from 0 to 2].

The invention discloses a ketone-removing additive for removing ketone substances from packaging card paper, and application of the additive. The ketone-removing additive comprises organic amine and a catalyst, wherein the organic amine is one or more of ethanediamine, propane diamine, butanediamine, ethanolamine, guanidine and dimethyl biguanide; the catalyst is one or more of acetic acid, propionic acid, citric acid and malic acid; the mass ratio of the organic amine to the catalyst is 1.5: 1 to 2.5: 1. The ketone-removing additive is added into a water dispersible coating solution containing acrylic resin at room temperature to obtain a water-based coating solution, wherein the mass percent of the ketone-removing additive in the coating solution is 0.5%-5.0%. The water-based coating solution is used for removing the ketone substances from the packaging card paper. An experiment shows that the water-based coating solution can be used for effectively removing the ketone substances from the packaging card paper. The water-based coating solution is low in production cost, cannot change the structure and the characteristics of the paper in a ketone removing process, and cannot influence the subsequent processing process of the packaging card paper.

Methods to preserve starch present in pulp are provided and also methods to control calcium precipitation and / or scaling in digesters or BOD systems. The methods can be performed as part of a papermaking process. Process water containing pulp can be treated with a chloramine. Process water containing pulp with native starch can receive a double treatment with at least one biocide, such as chloramine, and at least one oxidant, such as sodium hypochlorite. The treatment can be performed in any suitable manner. The treatment can be performed at one or more stages or locations in a papermaking system. A target residual chloramine value or range can be achieved by the treatment. Packaging sheets / boards and other paper products manufactured using the methods provided exhibit superior strength and other desirable characteristics.

The invention relates to the field of microorganism control in the paper pulp and / or water treatment process in a papermaking technology, and concretely provides a microorganism control system. The system includes a first component and a second component which are separate, the first component comprises a stabilized halogen-containing bactericide (such as stabilized hypochlorite), and the second component includes a sulfamic acid reagent (such as sulfamic acid). The invention also provides a method for controlling microorganisms in the paper pulp and / or water treatment process in the papermaking technology. The microorganism control system is used in the method.

The invention relates to a method for preventing or delaying bacterial sporulation in the broke system of a board or paper machine by lowering the content of transition metals in the broke to a level unfavorable for sporulation. Preferably bacterial cells present in the broke system of the board or paper machine are not substantially killed by the procedure used for lowering the content of the transition metals. The invention further relates to a method for producing packaging board or packaging paper having a low bacterial spore content.

There is provided a method of inhibiting the development of a biofilm adjacent a surface, the method comprising intermittently applying a biofilm inhibiting substance to a collection of microorganisms having biofilm developing potential. Other embodiments are also described.

The invention relates to a method for preventing or delaying bacterial sporulation in the broke system of a board or paper machine by lowering the content of transition metals in the broke to a level unfavorable for sporulation. Preferably bacterial cells present in the broke system of the board or paper machine are not substantially killed by the procedure used for lowering the content of the transition metals. The invention further relates to a method for producing packaging board or packaging paper having a low bacterial spore content.

The invention is directed to a method for detecting the presence of biofilm-forming microorganisms in a paper or board making process for determining the need of an anti-biofilm agent in the process. The method comprises the steps: (a) subjecting a sampler device in the process line for a period of time to enable said microorganisms to form a biofilm in situ in said process on the surface of the sampler, (b) optionally treating said formed biofilm in a solution of a test anti-biofilm agent for a period of time, then (c) contacting said biofilm with a liquid growth medium in a recession of a culturing device for a period of time, and (d) removing the growth solution from the recession of said device and detecting qualitatively and / or quantitatively the presence or absence of a biofilm adhered on the walls of the recession. An assembly kit is also provided.

A method of papermaking in which an optimum wet end environment can be created. A hydrochloric acid acidified aqueous solution of sodium hypochlorite exhibiting a pH value of =4 but <7 and an effective chlorine concentration of 1000 to 10,000 ppm, preferably 3000 to 8000 ppm, is charged in a white water pit and adjusted so that the effective chlorine concentration becomes = 0.5 ppm. Preferably, an aqueous solution of chlorous acid or hypochlorous acid adjusted to a weak acid pH value of =4 but <7 is continuously or intermittently added to papermaking raw water prior to papermaking with the expectation that at bleaching, the residual chlorine concentration is = 500 ppm, thereby carrying out bleaching treatment.