Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control

Definitions

• the invention relates to a method for controlling the settling of resins from cellulose and / or wood pulp suspensions.
• the resins present in the pulp and wood pulp contain about 1-5% by weight of so-called harmful resins (cf. J. Weigl et al. Das Paper, 1986. p. V52 - V 62). These can be in a colloidal unbound form or adhere to the paper fibers.
• the adhesive properties of the resins can now have a negative effect on the one hand in the process of producing cellulose and wood pulp itself, and on the subsequent paper production.
• the object of the present invention was therefore to develop a process for controlling the settling of resins from cellulose and / or wood pulp suspensions.
• it was to be striven for that the auxiliaries to be used in the process are largely biologically compatible and therefore, from an ecological point of view, meet the requirements which are becoming increasingly important in the paper-processing industry today.
• This object was achieved according to the invention by a process for controlling the settling of resins from pulp and / or pulp suspensions, the pulp and / or wood pulp suspension metered in an effective amount of a degradation product of native starch.
• the present invention therefore relates to a process for controlling the settling of resins from pulp and / or pulp suspensions, which is characterized in that an effective amount of a degradation product of native starch is metered into the suspension.
• Degradation products of native starch in the context of the present invention are understood to mean those products which are accessible by thermal, hydrolytic or enzymatic degradation of native starch and which have a lower average molecular weight than the underlying native starch and a higher average molecular weight than glucose, the Have a complete degradation product.
• the products of a chemical derivatization such as the esterification, etherification, acetylation, etc. do not fall under the definition of the degradation products of native starch used here.
• those degradation products of native starch are preferred which have an average molecular weight in the range from 1,200 to 600,000.
• the preferred way of producing these products is acidic and enzymatic hydrolysis or a combination of these methods.
• the type of native starch which is used to produce the degradation products suitable according to the invention is not subject to any particular restriction.
• potato starch, corn starch, rice starch or canna starch are used as starting materials.
• the effect of the degradation products of native starch which are suitable according to the invention can be improved by additionally carrying out the process in the presence of a cellulose derivative.
• the cellulose derivative here is carboxymethyl cellulose, methyl hydroxypropyl cellulose, methyl cellulose,
• Methylhydroxyethyl cellulose, hydroxyethyl cellulose and mixtures of these substances are particularly preferred.
• Another object of the present invention is the use of degradation products of native starch to control the settling of resins from cellulose and / or pulp suspensions.
• the degradation products of native starch according to the invention can be metered in at any point in the entire process of producing primary fibers. They are metered in either in the form of solid particles or in the form of an aqueous solution or dispersion.
• the effective amount of the degradation products of the native starches required in each case depends on the extent to which the aqueous suspensions of the primary fibers to be processed contain adhesive resins. As a rule, however, the degradation products of native starch according to the invention are used in an amount in the range from 0.001 to 5.0% by weight, preferably 0.1 to 1.0% by weight, based on the primary fiber material.

Landscapes

• Polysaccharides And Polysaccharide Derivatives (AREA)
• Paper (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Compositions Of Macromolecular Compounds (AREA)

Applications Claiming Priority (3)

Publications (1)

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Family Cites Families (2)

• 1993
  • 1993-06-21 DE DE4320453A patent/DE4320453A1/de not_active Withdrawn
• 1994
  • 1994-06-13 WO PCT/EP1994/001920 patent/WO1995000704A1/de not_active Application Discontinuation
  • 1994-06-13 JP JP7502400A patent/JPH08511831A/ja active Pending
  • 1994-06-13 EP EP94918868A patent/EP0705366A1/de not_active Ceased
  • 1994-06-13 KR KR1019950705771A patent/KR960703187A/ko not_active Application Discontinuation
• 1995
  • 1995-12-19 FI FI956115A patent/FI956115A/fi not_active Application Discontinuation

Non-Patent Citations (1)

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