JPH0723596B2 - Method for manufacturing wrapping paper and ball paper - Google Patents

Abstract

1. Process for the manufacture of wrapping paper and of cardboard, characterized in that the following are added to the suspension containing the cellulose fibres before the sheet is formed : a) more than 0.5 parts by weight of cationic starch per 100 parts of cellulose fibres, b) less than 1 part by weigth, expressed as Al2 O3 , of aluminium polychloride per 100 parts of cellulose fibres.

Description

FIELD OF THE INVENTION The present invention relates to a method for producing paper, in particular wrapping paper and cardboard.

2. Description of the Related Art Papermaking pulp, which is a raw material mainly composed of cellulose fibers, is made into a dilute aqueous suspension and conveyed to a flow box of a paper machine, where it is distributed on a filter cloth to form a sheet of paper. The sheet is then dehydrated and dried. The quality and properties of the paper thus obtained depend on, inter alia, the operating conditions of the paper machine, the raw pulp, various additives added in suspension before sheet formation and on the sheet after distribution on the filter cloth. It is determined by the substance to be applied.

The present invention particularly relates to the substance added before the above-mentioned sheet formation.

The main quality required for the wrapping paper is strength, but it is more advantageous if the wrapping paper can be provided with moisture resistance. Cellulose fibers are obtained from a raw material pipe, but recycled paper is often recycled corrugated cardboard, and a mixture of this and raw material pulp is also used.

Problems to be Solved by the Invention British Patent No. 2,015,614 describes a method for producing wrapping paper and corrugated paper. According to this production, cationic starch (starch) and basic starch are added before a flow box. Aluminum polychlorosulfate or ammonium sulfate is added to the fiber suspension. At this time, the added amount of the ion starch for use is 0.4% by weight or less based on the cellulose fiber. Cation starch is known to provide mechanical strength to paper and can be used in suspensions at 0.
It would be further advantageous if much more than 4% of the starch could be introduced and in particular this starch could be retained in the formed sheet. However, since starch is highly hydrophilic,
If the amount exceeds 5%, it becomes impossible at all to form a sheet of paper on the filter cloth, or the productivity of the paper machine is significantly reduced.

Therefore, according to the present invention, in the flow box of the paper machine 0.
A new method has been found which makes it possible to use starch in amounts of 5% and above.

Means for Solving the Problems In the present invention, prior to sheet formation, (a) 0.5 parts by weight or more of cationic starch per 100 parts of cellulose fibers, and (b) polyaluminum chloride are added to a suspension containing cellulose fibers. The present invention provides a method for producing wrapping paper and cardboard, which is characterized by adding and.

The above-mentioned suspension containing cellulose fibers may be untreated or bleached pulp or a mixed pulp thereof.
Used paper and cardboard are often added to this mixed pulp.

The above-mentioned cationic starch (starch) refers to a mixture of one or more products commercialized under the general term of cationic starch. These products are described, for example, in "KIRK OTHMER", 3rd edition, volume 21, page 503. The addition amount is preferably 0.5 to 5 parts, more preferably 0.7 to 2 parts, based on 100 parts of the cellulose fiber. Polyaluminum chloride generally means "polyaluminum chloride", "basic polyaluminum chloride", "basic aluminum polychlorosulfate", but in particular one or more of the following substances are preferred.

_{(1): Aln (OH) mCl 3 n} - m (I) ( where, n is an arbitrary value, 3n-m is a positive value, and m and n
Is a positive integer). This salt also contains sulfuric acid, phosphoric acid, polyphosphoric acid,
It may contain a polyvalent anion Y selected from anions of silicic acid, chromic acid, carboxylic acid and sulfonic acid, and the Y / Al molar ratio is preferably 0.015 to 0.4.

_{(2): Aln (OH) mCl 3 n} - m -2 k (SO 4) k (II) ( provided that, k, m, n is a positive integer; 3n> m + 2k; basicity m /
3n is 0.3 to 0.7; k / n = 0.01 to 0.3). This material is the subject of U.S. Pat.
It can be manufactured according to the method described in No. 9,666.

(3): _{[Aln (OH) 3 n - m} -2 pClm (SO 4P) ] z (III) [However, (3n-m-2p) /3n=0.4~0.7;p=0.04~0.2
5n; m / p = 8 to 35; k, m, n and p are integers; z is a value of 1 or more]. This material is a British Patent No. 2,128,97
It is described in No. 7.

_{(4): AlnOHm (SO 4) kCl 3} n - m -2 k (IV) ( where basicity namely the molar ratio (m / 3n) × 100 is about 40
In the range of ~ 65%; Al equivalent / Cl equivalent ratio of 2.8 to 5; apparent molecular weight AM measured by known light scattering, and apparent hydrodynamic particle size φZ measured by quasi-elastic light scattering. And φW are AM = 7,000 to 35,000 φZ (Å) = 350 to 2,500 φW (Å) = 200 to 1,200 respectively), which is a basic positive aluminum chlorosulfate. This material is described in French Patent No. 2,584,699.

The amount of polyaluminum chloride represented by Al ₂ O ₃ is preferably 1 part or less, and more preferably 0.02 to 0.3 part, based on 100 parts of the cellulose fiber.

The above substances (a) and (b) can be added in any order and at any position before the flow box of the paper machine, but it is preferable to add the polyaluminum chloride after the cation starch. desirable. Further, it is desirable to add the polyaluminum chloride at a point as close as possible to the flow box.

Prior to sheet formation, a suspension containing cellulose fibers,
In addition to substances (a) and (b), it is also possible to add other substances such as colorants.

According to another aspect according to the invention, in addition to cationic starch, polyacrylamide, polyethyleneimine, carboxymethylcellulose, urea-formaldehyde resin,
Melamine-formaldehyde resin, aminopolyamide-
One or more substances selected from epichlorohydrin resins and polyamide-epichlorohydrin resins can be added. These substances are used in addition to the cation starch, and it is desirable to add the same amount.

In another aspect of the invention, the paper may be slightly modified by adding a sizing agent in addition to the above substances (a) and (b) or the above substances such as polyacrylamide added in addition to the cationic starch. It can be made hydrophobic to make it moisture proof.

In this case, any sizing agent can be applied, but rosin or dimer alkyl ketene and its derivative,
It is desirable to use one or more materials selected from fluorinated phosphates, anhydrides of aliphatic carboxylic acids, polyurethanes and styrene / maleic anhydride copolymers.

Particularly, it is preferable to use dimer alkyl ketene and carboxylic acid anhydride. The amount of these used varies depending on the properties required for the paper or the cardboard, but the cellulose fiber
It is preferably 10 parts or less with respect to 100 parts, and more preferably 0.1 to 2 parts.

The size is preferably added before the polyaluminum chloride.

Further, usual additives such as colorants may be added to the suspension before sheet formation.

Among the advantages of the present invention, besides providing excellent mechanical properties, is that the amount of suspended solids in the water collected under the filter cloth during sheet formation is greatly reduced.

Furthermore, the present invention improves the productivity of papermaking paper and improves internal cohesion. All of these advantages can be seen in the examples. The present invention will be described in more detail with reference to the following examples.

Comparative example (not according to the present invention) (1) Ingredients in flow box 100% waste paper Sizing agent: dimer alkylketene 0.15 parts (2) Operating conditions of paper machine: wire mesh, effective web width: 2.6 m Basic weight : 190g / m ² Paper type: Cardboard liner (3) Treatment after paper making: Natural starch is sprayed on the surface.

In this comparative example, 1.4 parts of cation starch was added to the flow box per 100 parts of fiber.

Results are as follows: Paper machine speed: 163m / min Total balance: 79% Mullen burst factor: 2.75 (based on AFNOR standard NF Q 03053) pH (in flow box): 7.2.

Example 1 (according to the invention) The same operation as in the comparative example is carried out, but when polyaluminum chloride is represented by Al ₂ O ₃ in the flow box, it is further added in a ratio of 0.15 parts to 100 parts of the cellulose fibers. did.

The results are as follows: Paper machine speed: 200 m / min Total balance: 85% Mullen burst coefficient: 3.09 pH (in flow box): 7.2.

Example 2 (according to the invention) The same operation as in Example 1 is carried out, except that the polyaluminum chloride added in Example 1 is added in an amount of 0.16 per 100 parts of the cellulose fiber.
Added in parts.

Results are as follows: Paper machine speed: 220 m / min Total balance: 85% Mullen burst coefficient: 2.96 pH (in flow box): 7.2.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location D21H 17/33 17/63 (56) References Japanese Patent Publication Sho 36-21810 (JP, B1) Japanese Patent Publication 45-2804 (JP, B1)

Claims (8)

[Claims] 1. A method for producing wrapping paper and cardboard, which comprises adding the following (a) and (b) in a flow box to a suspension containing cellulose fibers before papermaking: (a) Cellulose 0.5 parts or more of cationic starch per 100 parts of fiber, (b) polyaluminum chloride. 2. The method of claim 1, further comprising adding a sizing agent. 3. The method according to claim 1, wherein (b) is basic aluminum polychlorosulfate. 4. The amount of (a) is 0.5 per 100 parts of cellulose fiber.
The method according to any one of claims 1 to 3, which is used in an amount of -5 parts. 5. When (b) is represented by Al ₂ O ₃ , it is used in an amount of 1 part or less per 100 parts of the cellulose fiber.
4. The method according to any one of 4 to 4. 6. The method according to claim 2, wherein the sizing agent is a dimeric alkylketene or a carboxylic acid anhydride. 7. The amount of the sizing agent used is cellulose fiber 10
The method according to any one of claims 2 to 6, which is 10 parts or less with respect to 0 parts. 8. (a) and (b) or (a), (b)
And sizing agents, polyacrylamide, polyethyleneimine, carboxymethylcellulose, urea-formaldehyde resin, melamine-formaldehyde resin,
8. The method according to any one of claims 1 to 7, wherein at least one substance selected from aminopolyamide-epichlorohydrin resin and polyamide-epichlorohydrin resin is added.