JPH0768677B2 - Recycled sheet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sheet regenerated from a paperwork product to which a heat-fusible resin film is attached, such as a paper container for milk, soft drink, alcoholic beverage and the like. .

[Prior Art] When reusing a paper product to which the above heat-fusible resin film is stuck, conventionally, the paper and the heat-fusible resin film are separated and only the fiber component of the paper is used. There is.

[Problems to be Solved by the Invention] When a wet sheet prepared by pulverizing and mixing a heat-fusible resin film and paper without separating is passed through a dryer,
The crushed heat-fusible resin in the wet sheet heat-bonds to the surface of the dryer, which causes perforation in the heat-fusible resin portion of the dried recycled sheet. With such holes, the commercial value of the recycled sheet is significantly reduced, and the heat-fusible resin adhering to the dryer also causes a hindrance to the drying action of the dryer. Therefore, in recycling a paper product to which the heat-fusible resin film is attached, the step of separating and removing the heat-fusible resin film cannot be avoided, and it is difficult to reduce the cost of the recycled sheet.

It is an object of the present invention to provide a recycled sheet that does not require separation and removal of the heat-fusible resin contained in paper products.

[Means and Actions for Solving the Problem] In the present invention, first, a pulverized product obtained by pulverizing a paper product containing a fiber base material having a relatively long fiber length and a heat-fusible resin is put into water and stirred. Spread. Although the fiber length of the pulverized product is considerably shorter than that of the fiber base material, the pulverized product does not adhere to the fiber base material in a laminated state in water as it is.

After this dispersion step, the first aggregating material is added and mixed in the same water. As a result, the pulverized material is aggregated and fixed in a laminated state on the fiber base material.

After this coagulation-fixing step, an auxiliary fiber material having a fiber length considerably shorter than that of the fiber base material is put into the same water and dispersed by stirring. As a result, the crushed material is retained internally by the auxiliary fiber material.

After this inclusion, the aggregating material is poured and mixed in the same water. As a result, the fiber base material, the pulverized material, and the auxiliary fiber material are aggregated and fixed, and the pulverized heat-fusible resin is included and fixed in the aggregated fiber material.

After the second cohesive fixing step, a hydrophobizing material is added and mixed. As a result, the fibrous material-containing aqueous solution becomes hydrophobic, and the high viscosity of the fibrous material-containing aqueous solution due to the addition and mixing of the aggregating material is reduced. This reduction in viscosity improves drainage (water drainage) and enables papermaking.

If the wet sheet thus paper-made is dried with a drier, the pulverized heat-fusible resin in the agglomerated fiber material is melted in the agglomerated fiber material, and this molten resin does not exude to the sheet surface. The fiber base material, the fibers of the ground product and the auxiliary fiber material are bonded. Therefore, the heat-fusible resin does not heat-bond to the dryer, and the perforation of the recycled sheet due to such heat-bonding is eliminated.

The recycled sheet thus obtained is a pulverized product of a paper product containing a heat-fusible resin, a fiber base material that holds the pulverized product, and the pulverized product is aggregated and fixed in a laminated state on the fiber base material. A first aggregating material, an auxiliary fiber material for encapsulating and fixing the pulverized heat-fusible resin, and a second aggregating material for aggregating each of these pulverized products, fiber base material and auxiliary fiber material The heat-fusible resin melted in the sheet during drying adheres the fiber base material, the fibers of the pulverized material, and the auxiliary fiber material to the spot or surface. As a result, the recycled sheet has moisture permeability and air permeability.

If a porous material such as zeolite, activated carbon, or silica gel (functionality-imparting material with gas adsorption) is added and mixed before the hydrophobic step, the recycled sheet has a function of maintaining freshness, and if such a recycled sheet is used, fruit, Aging of flowers can be suppressed by maintaining the freshness of vegetables and eggs, or by covering the flowers with a regenerated sheet after sunset.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the drawings in the circles in each drawing are schematic representations and do not accurately reflect the actual state.

The member numbered 1 in Fig. 1 is a paper product such as a milk pack, alcoholic beverage pack, etc. to which a heat-fusible resin film is pasted, and the wavy line-shaped object shown by the number 1A in the figure circle is crushed paper fiber. The shape represented by number 1B represents a crushed heat-fusible resin. The fiber length of crushed paper fiber 1A is 0.1-5 mm
It is a degree. The pulverized products 1A and 1B are uniformly mixed with a 1% carboxymethylcellulose solution. A 1% solution of carboxymethyl cellulose is 50 ml, and the weight of pulverized products 1A and 1B is 5 g. Carboxymethyl cellulose is for increasing the strength of the recycled sheet.

The long linear object indicated by the number 2 in the circle in FIG. 2 represents a fiber base material made of chemical fiber waste. Chemical fiber waste (fiber base material)
2 is a cutting waste such as a paper diaper, clothes, gauze, etc., and the fiber length is relatively long, 10 to 20 mm. The fiber base material 2 is put in water and uniformly stirred and dispersed. Water is 3, fiber base 2 is 5g
Is.

After this dispersion step, a 1% solution of carboxymethyl cellulose containing the pulverized products 1A and 1B is put into the water and uniformly stirred and dispersed. Carboxymethyl cellulose is for increasing the strength of the recycled sheet.

After this dispersion step, 5 ml of a 1% solution of a cationic polyamine (polymer flocculant) was put into the water and mixed by stirring (first
(Aggregating and fixing step). By this first cohesive fixing step, the pulverized products 1A and 1B are coherently fixed in a laminated state on the fiber base material 2 as shown in FIG. In the figure, the □ -shaped object indicated by number 7 represents the first polymer flocculant.

In this embodiment, the fibrous base material 2 is first put into water and uniformly stirred and dispersed, and then the pulverized products 1A and 1B are put and uniformly stirred and dispersed, but the order of putting both may be reversed or simultaneous. Good.

After the first cohesive fixing step, 5 g of auxiliary fiber material consisting of papermaking waste
Is poured into the water and uniformly dispersed by stirring (mixing and dispersing step)
To do. The Δ shaped object indicated by the number 3 in the circle in FIG. 4 represents the auxiliary fiber material, and the fiber length of the auxiliary fiber material 3 is about 0.1 to 2 mm. As a result of this dispersion, as shown in FIG. 4, the auxiliary fiber material 3 is crushed on the laminated material of the fiber base material 2 and the crushed materials 1A and 1B.
A and 1B are attached in a laminated form so as to include them.

After the mixing and dispersing step, 5 ml of a 1% solution of cationic polyamine (polymer flocculant) is put into the water and mixed by stirring.
In FIG. 5, reference numeral 4 indicates a ● -shaped product representing a second polymer flocculant composed of a cationic polyamine, and the second polymer flocculant 4 comprises a fiber base material 2, crushed products 1A, 1B and auxiliary fiber materials. 3. Fix 3 together. The heat-fusible resin 1B crushed by the second cohesive fixing step is fixed in the laminated material composed of the fiber base material 2, the crushed paper fiber 1A and the auxiliary fiber material 3 so as to be enclosed by the auxiliary fiber material 3. To do.

After this second or second cohesive fixing step, in this example 1 g alumina powder, 1 g zeolite powder, 1 g silica gel powder, 5 ml carboxymethylcellulose 1% solution, 5 ml cationic polyamine 1% solution, 1 aluminum sulfate.
% Solution, 5% anionic acrylamide 1% solution and 0.1 g of antibacterial agent are mixed in this order and stirred uniformly. Carboxymethyl cellulose is used to increase the strength of recycled sheets, silica gel powder is a porous material that is a highly water-absorbing functional material, and zeolite powder is a porous material that is highly porous and highly functional. It is a material. Alumina powder is to enhance this functionality. The 1% anionic acrylamide solution is a polymer flocculant, and the 1% aluminum sulfate solution is a hydrogen ion concentration adjuster.

FIG. 6 shows a state in which a water absorption function-imparting material called silica gel powder, a gas adsorption function-imparting material called zeolite powder and a hydrogen ion concentration adjusting agent called 1% aluminum sulfate solution are mixed. In the figure, the o shape shown by number 5 represents the water absorbing function imparting material and the gas adsorbing function imparting material, and the shape indicated by number 6 represents the hydrogen ion concentration adjusting agent. Illustration of other contaminants is omitted.

The hydrogen ion concentration adjusting agent 6 is a hydrophobizing agent, and the hydrophobizing agent 6
By mixing the above, the aqueous solution containing the fibrous material such as the fibrous base material 2, the crushed material 1A, and the auxiliary fibrous material 3 is hydrophobized. The viscosity of the fibrous material-containing aqueous solution is as high as about 1000 to 2000 cps due to the polymer aggregating material 4 composed of the cationic polyamine used in the coagulation-fixing step performed after the mixing and dispersing step, and drainage (water drainage) is poor in this state. I can't make paper. By incorporating the hydrophobizing agent 6, the viscosity is reduced to about 10 to 500 cps, and the drainage is significantly improved. This enables papermaking.

Further, the aggregating action of the 1% solution of anionic acrylamide aggregates the laminated fibrous material in the fibrous material-containing aqueous solution as shown in FIG. The size of this nodule is about 1 to 10 mm in diameter, and escape from the papermaking net is prevented. Papermaking is more favorably carried out by this agglomeration, but papermaking can be carried out only by making hydrophobic.

The wet sheet obtained through the papermaking process is press-dried or oven-dried under heating at 105 to 140 °. The heat-fusible resin 1B in the wet sheet is enclosed by the auxiliary fiber material 3 and is melted by drying.
1B bonds the fiber base material 2, the crushed paper fiber 1A and the auxiliary fiber material 3 without leaching to the sheet surface. Therefore, the heat-fusible resin 1B does not heat-bond to the dryer, and the perforation of the recycled sheet due to such heat-bonding is eliminated. That is, it is not necessary to intervene in the step of peeling the heat-fusible resin film from the papermaking product 1, and a large cost reduction of the recycled sheet can be achieved.

The heat-fusible resin 1B in the recycled sheet obtained by drying adheres the fiber base material 2, the crushed paper fiber 1A and the auxiliary fiber material 3 to each other in a point or surface manner. Has a moisture-permeable function and an air-permeable function. Further, the regenerated sheet contains a water-absorbing function-imparting material made of silica gel powder and a gas-adsorbing function-imparting material made of zeolite powder, and the regenerated sheet has a moisture absorption / exhaust function and a gas adsorption function. Furthermore, the fiber base material 2 made of chemical fiber waste is bulky, and the recycled sheet can be formed into a bulky fiber laminate. Therefore, it is also excellent in heat insulation, heat retention, and cushioning.

The following Tables 1 and 2 show the measurement results of the recycled sheet obtained in this example and the comparative example by the conventional general papermaking method. Measuring method is JIS-P "Pulp / Paper", JIS-Z
Same as “General and Other”.

In the comparative example, the same amount of the fibrous base material, the crushed paperwork product, the auxiliary fibrous material, the function-imparting material, and the like is used for 3 parts of water as in the example. In the comparative example, 50 ml of 1% aluminum sulfate solution,
100 ml of a 1% solution of cationic polyamine and 100 ml of a 1% solution of anionic polyacrylamide are collectively charged as in the conventional papermaking system.

As is clear from Table 1, the conventional techniques shown in Comparative Examples have problems in both papermaking and drying, and it is extremely difficult to make a paper stock containing a heat-fusible resin into a sheet. Is. However, in the present invention, there is no problem in both paper making and drying, and a good recycled sheet can be obtained.

Further, as is apparent from Table 2, this example is far superior to the comparative example in terms of air permeability, moisture permeability and bursting property. On the premise of such good air permeability and moisture permeability, the gas adsorbing function imparting material effectively functions in this embodiment. Therefore, excellent preservation of freshness can be achieved by storing fruits, vegetables, chicken eggs, etc. together with the recycled sheet of this embodiment. Alternatively, by covering the flowers with the regenerated sheet of this embodiment after sunset, ethylene / hormone gas released from the flowers is adsorbed to the regenerated sheet, and aging of the flowers can be suppressed.

It should be noted that, even when the materials used in this example are mixed together in the same amount in lieu of the comparative example, it is impossible to obtain good measurement results as in the present example shown in Tables 1 and 2. Has been confirmed.

In this embodiment, chemical fiber waste is used as the fiber base material and papermaking waste is used as the auxiliary fiber material. What is conventionally disposed of as industrial waste is effectively used. If the fiber length is relatively long, synthetic fibers or natural fibers, and as the auxiliary fiber material, fibers other than papermaking debris can be used if the fiber length is considerably shorter than the fiber base material.

In the present invention, as the aggregating agent for aggregating and fixing the pulverized material on the fiber substrate, a polyimine-based or polyacryl-based copolymer polymer aggregating agent other than the polyamine-based polymer aggregating agent containing a cationic polyamine is adopted. Is also possible.

Further, in the present invention, in addition to a polyamine-based polymer macromolecular flocculant containing an anionic polyamine as an aggregating agent for aggregating and fixing a pulverized product, a fiber base material and an auxiliary fiber material, a polyimine-based or polyacrylic-based copolymer It is also possible to employ a molecular flocculant.

In addition to the cellulose derivative containing carboxymethyl cellulose used in the hydrophobizing step, a starch derivative or a casein derivative can be adopted.

It is also possible to employ a polyamine-based or polyimine-based copolymer polymer flocculant other than the polyacrylic copolymer polymer flocculant containing anionic acrylamide for agglomerating the fibrous material.

Further, in the present invention, the weight ratio of the pulverized products 1A, 1B, the fiber base material 2, the first polymer coagulant 7, the auxiliary fiber material 3, the second polymer coagulant 4, and the hydrogen ion concentration modifier 6 is: Not limited to the above examples, 30-80 parts by weight of pulverized material, 10-35 fiber substrate
Parts by weight, 0.1 to 2 parts by weight of the first polymer coagulant, 10 to 35 parts by weight of auxiliary fiber material, 0.1 to 2 parts by weight of the second polymer coagulant,
The hydrogen ion concentration adjusting agent can be adjusted within the range of 0.1 part by weight. In addition, 0.1 to 2 parts by weight of a polymer flocculant for agglomeration, 3 to 30 parts by weight of a function-imparting material composed of zeolite, silica gel or activated carbon, 3 to 30 parts by weight of alumina powder, and 0.01 to an antibacterial agent. It can be adjusted within the range of 1 part by weight.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, after the pulverized product containing the fiber base material and the heat-fusible resin is stirred and dispersed in water, the first cohesive material, the auxiliary fiber material, and the second Since they were mixed in the order of the aggregating material, the crushed heat-fusible resin is included and fixed in the agglomerated fiber material, and the fusion of the heat-fusible resin due to drying after the papermaking process does not exude to the surface of the sheet within the sheet. Therefore, the problem caused by the fusion of the heat-fusible resin is surely solved. Again 2
After the coagulation-fixing step of the second time, the hydrophobizing material is added and mixed to make the aqueous solution containing fiber material hydrophobic, so that the high viscosity of the aqueous solution containing fiber material due to the addition and mixing of the aggregation material is reduced, and the drainage property is improved. As a result, the problems in the papermaking process are solved.

The recycled sheet thus obtained is a pulverized product of a paper product containing a heat-fusible resin, a fiber base material that fixes the pulverized product, and a first agglomerate that fixes the pulverized product on the fiber base material. Material, an auxiliary fiber material for encapsulating and fixing the crushed heat-fusible resin, and a second agglomerate of each crushed product, fiber base material and auxiliary fiber material
And a cohesive material as a basic material, and exhibits excellent effects in terms of commercial value and cost as a sheet that does not go through the step of separating the heat-fusible resin from the paper product.

[Brief description of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic view in which a paper product containing a heat-fusible resin is crushed and uniformly mixed with a 1% carboxymethylcellulose solution, FIG.
FIG. 3 is a schematic view showing a state where a fiber base material is stirred and dispersed, and FIG. 3 shows a first flocculation-fixing step in which a first polymer flocculant is added after the fiber base material and a pulverized product are stirred and dispersed. A schematic diagram, FIG. 4 is a schematic diagram showing a mixing and dispersing step in which an auxiliary fiber material is charged and dispersed by stirring, and FIG. 5 is a second flocculation-fixing step in which a second polymer flocculant is charged and stirred. FIG. 6 is a schematic diagram showing a hydrophobic step in which a function-imparting material and a hydrophobizing agent are mixed, and FIG. 7 is a state in which a polymer coagulant is added to aggregate fibrous materials. It is a schematic diagram. Pulverized products 1A and 1B containing a heat-sealing resin, a fiber base material 2, an auxiliary fiber material 3, a polymer coagulant 7 for the first cohesive fixing, and a polymer coagulant 7 for the second cohesive fixing, Hydrophobizing agent 6.

Claims (1)

[Claims] 1. A crushed product (1A, 1B) obtained by crushing a paper product (1) containing a heat-fusible resin (1B) and a fiber base material (2).
Is stirred and dispersed in water, and after this dispersion step, the first flocculating material (7) is added and mixed in the same water to coagulate and fix the fiber material (2) and the pulverized products (1A, 1B). The auxiliary fiber material (3) is put into the same water to mix and disperse, and after this mixing and dispersing step, the second flocculant (4) is put and mixed into the same water to mix the fiber base material (2) and the pulverized material (1A, 1B) and the auxiliary fiber material (3) are coagulated and fixed, and after this second coagulation and fixing step, the hydrophobizing agent (6) is added and mixed to hydrophobize the fibrous material-containing aqueous solution. A recycled sheet obtained by papermaking and drying the papermaking wet sheet.