JP2001018965A - Method for manufacturing waste pulp pallet and waste pulp pallet obtainable by the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing waste pulp pallet in which its cost is less expensive, it is helpful for protecting environment and it has a superior strength. SOLUTION: This method for manufacturing a waste pulp pallet comprises a step for adjusting an amount of inclusion of solid material in waste pulp in a range of 0.5 to 18 wt.%; a step for feeding waste pulp into a die, performing a vacuum dewatering processing and further performing a high pressure pressing under a condition of pressure of 15 to 1000 kg/cm to mold the waste pulp plate material having the inclusion amount of solid substance by 50 to 60 wt.%; and a step for molding the waster pulp plate material having the inclusion amount of solid substance by 90 to 95 wt.% by performing a drying operation against the waste pulp plate material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a waste pulp pallet and a waste pulp pallet obtained thereby.

[0002]

BACKGROUND OF THE INVENTION In the current industry, pallets are widely used to transport or store heavy materials and large cargoes. Currently used pallets are mostly made of wood. However, countries around the world are demanding that wooden pallets be thoroughly insect-proofed with the increasing awareness of environmental protection. In addition, countries such as European countries, the United States and Japan have required importers to collect wooden pallets or have forced waste disposal costs. As described above, since the wooden pallets are extra expensive, some of the conventional wooden pallets have already been replaced with product paper.

[0003] The above-mentioned paper pallets are mostly formed from product paper, for example, paperboard, corrugated paperboard, kraft paper or the like, by any of the following processing methods (a) to (c). (A) A method of forming a board by adhering a plurality of sheets of paper. (B) A method of forming a board by sticking honeycomb-type paperboards together. (C) A method of forming a board by adhering a plurality of corrugated paperboards.

Such paper pallets are disclosed, for example, in US Pat. Nos. 5,329,861 and 5,411,786.
No. 5,493,962, No. 5,595,12
No. 5, No. 5,609,557 and the like.

[0005]

However, the above-mentioned paper pallet requires a high cost because the product paper as a raw material is made by using an expensive paper machine using pulp as a raw material, and the paper pallet has the above-mentioned disadvantages in the process of processing the product paper. There is a drawback that the cost is considerably high because a large number of adhesive operations are required. Therefore, instead of the above product paper, it is conceivable to make a paper pallet using discarded paperboard,
Since many discarded paperboards have scratches, discarded paperboards cannot be collected and used as they are. Therefore, the paper pallet has to use new paperboard, which indirectly consumes wood and is not very useful for environmental protection. Furthermore, in the process of producing product paper from pulp, a process such as bleaching for adjusting the color is required, and a large amount of wastewater causing environmental pollution may be generated.
Further, the conventional paper pallets are not subjected to the waterproofing treatment and the moisture-proofing treatment, and have a disadvantage that they are inferior in strength.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of manufacturing a waste pulp pallet which is inexpensive, useful for environmental protection and excellent in strength, and to provide a waste pulp pallet obtained thereby. Aim.

[0007]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a process for adjusting the solid content of waste pulp to a range of 0.5 to 18% by weight; Vacuum dehydration treatment and pressure 15 to 1000 kg / cm
A step of forming a waste pulp board having a solid content of 50 to 60% by weight by performing a high-pressure pressing treatment under the conditions of ² , and a drying treatment of the waste pulp board to obtain a solid content. A first aspect of the present invention is a method of manufacturing a waste pulp pallet including a step of forming a waste pulp board material having a weight ratio of 90 to 95% by weight.

[0008] A second aspect of the present invention is a waste pulp pallet obtained by the above method.

That is, the inventor of the present invention has low cost,
We worked diligently to obtain a waste pulp pallet that is useful for environmental protection and has excellent strength. In the process, first of all, paying attention to recovered paper such as waste paper, and using it as a raw material to produce waste pulp pallets, it will be very cost-effective and will not consume a large amount of wood, thus helping to protect the environment. I figured it out. In addition, when the waste pulp is subjected to a high-pressure pressing treatment to produce a waste pulp plate, a plurality of sticking operations as in the case of using conventional product paper become unnecessary, and the cost is reduced accordingly. I figured it out. Furthermore, it was also found that the high-pressure pressing treatment shortened the distance between the fiber molecules of the waste pulp and formed strong hydrogen bonds, thereby improving the strength of the waste pulp plate material. In other words, after adjusting the solids content of the waste pulp, vacuum dehydration, high-pressure pressing, drying and other treatments are performed to reduce the cost, help protect the environment, and obtain a waste pulp pallet with excellent strength. Heading, the present invention has been reached.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Preferred embodiments according to the present invention will be described in detail.

FIG. 1 is an explanatory diagram showing a process for producing waste pulp from waste paper and adjusting the solid content in the waste pulp to a predetermined range. As shown in FIG. 1, first, waste pulp is produced from the recovered waste paper using pulp paper 11. Next, the waste pulp is sent to a sand basin 12 and a vibrating sieve 13 to remove impurities in the waste pulp, and then temporarily stored in a pulp pool 14. Next, the waste pulp stored in the pulp pool 14 is sent to the waste separator 15, and the waste in the waste pulp is further removed. Subsequently, the solid content in the waste pulp is adjusted to a predetermined range by the oblique sieve 16 and then stored in the pulp pool 17.

The solid content in the waste pulp is 0.5 to
It is necessary to adjust it to the range of 18% by weight, preferably 3%.
-10% by weight. That is, if the solid content in the waste pulp is less than 0.5% by weight, dehydration must be carried out in a subsequent process by spending a lot of time and energy, resulting in a decrease in production capacity and an economic demand. Because it does not meet. Conversely, the solid content in waste pulp is 18
If the amount exceeds 100% by weight, the transportation of raw materials becomes difficult,
This is because the adhesive force between the fibers in the waste pulp is weakened.

FIG. 2 is an explanatory view showing a step of forming a waste pulp plate from waste pulp. As shown in FIG. 2, first, waste pulp is taken out of the pulp pool 17, and a required amount of waste pulp is measured using the measuring bucket 21. Next, the waste pulp is sent to the pressure forming hydraulic machine 22, and the waste pulp is subjected to a vacuum dehydration process and a high-pressure pressing process at a predetermined pressure to obtain a waste pulp plate material having a solid content of 50 to 60% by weight. Molding. Subsequently, the waste pulp plate material is sent to a hot-air drying device 23 for hot-air drying, and then sent to a microwave drying chamber 24 for microwave drying. Thereby, the waste pulp board material 1 having a solid content of 90 to 95% by weight can be produced.

The conditions for the vacuum dehydration treatment in the pressure molding hydraulic machine 22 are preferably set so that the absolute pressure is in the range of 50 to 600 mmHg. By setting the absolute pressure in such a range, moisture easily escapes during high-pressure pressing, and the adjustment of the solid content becomes easy.

The condition of the high-pressure pressing by the press-forming hydraulic machine 22 is that the pressure is 15 to 1000 kg / c.
It must be set to be within the range of m ² . Above all,
Standard dimensions (122cm) for waste pulp board
X 244 cm), the pressure at the time of high-pressure pressing is preferably set in the range of 150 to 350 kg / cm ² . That is, when the size of the waste pulp plate material is reduced,
Although the pressure can be further increased, if the pressure at the time of high-pressure pressing exceeds 1000 kg / cm ² , the production capacity is greatly reduced, and the economic requirements cannot be satisfied.
Conversely, if the pressure at the time of high-pressure pressing is less than 15 kg / cm ² , dehydration must be carried out with much time and energy in the subsequent drying process.

FIG. 3 is an explanatory view showing a step of attaching a support leg to the bottom surface of the waste pulp board 1. First, nine square pillar-shaped support legs 41 are produced by the same process as that for the waste pulp board 1. Next, the bottom 9 of the waste pulp board 1
One area 43 is coated with gel, and the square pillar-shaped support leg 41 is fixedly attached with a nail 42. Thereby, the target waste pulp pallet can be obtained.

[0017]

[Modifications] The specific examples described in detail in the above embodiments are merely for easy explanation of the technical contents of the present invention, and the present invention is not limited to them in a narrow sense. Various changes can be made from the spirit of and defined in the claims below.

For example, the method of removing contaminants in waste pulp is not limited to a method using a sand basin 12, a vibrating sieve 13 and a contaminant separator 15 as shown in FIG. It is also possible to remove contaminants in waste pulp by using a soil removal device such as a high-concentration cleaner or a powerful sieving machine.

In FIG. 2, before the waste pulp is sent to the press-forming hydraulic machine 22, an additive, for example, paper such as emulsion, resin, starch, etc. is added to the waste pulp in order to increase the bonding force between the fibers. A force reinforcing agent may be added. It is to be noted that before the pressure molding by the pressure molding hydraulic machine 22, the waste pulp may be subjected to a dehydration treatment in advance using a low pressure hydraulic machine or the like.

Further, the method for drying waste pulp is shown in FIG.
The method is not limited to the method using the hot air drying device 23 or the microwave drying chamber 24 as shown in the above, and for example, the drying process can be performed using a heat roller.

The attachment of the support legs 41 to the waste pulp board 1 is not limited to the method using the nails 42 as shown in FIG. It is also possible to press and attach the supporting leg 41 with high pressure. Note that the shape of the support leg 41 is not limited to a quadrangular prism shape, and may be, for example, a rectangular column shape or a column shape, or may be hollow.

Further, the waste pulp pallet in the present invention is not limited to the waste pulp plate material 1 having the support legs 41 attached to the bottom surface as shown in FIG.
For example, the support legs and the waste pulp plate material may be integrally formed.

FIGS. 4A and 4B are perspective views showing the bottom surface of an integrally formed waste pulp pallet in which the support legs and the waste pulp plate are integrally formed. The pallet made of integrally formed waste pulp shown in FIG. 4A has a rectangular pillar-shaped hollow support leg 51 integrally formed with a waste pulp plate material. In addition, the integrally formed waste pulp pallet of FIG. 4B has a rectangular columnar hollow support leg 52 integrally formed with the waste pulp plate material. As described above, since the support leg 51 and the support leg 52 are both hollow, the weight of the pallet can be reduced, which is convenient for transportation and the like.

4 (a) and 4 (b), for example, the shape of the mold in the press-molding hydraulic machine 22 shown in FIG. 2 is changed to an integral mold.
It can be easily manufactured by integrally forming the supporting leg and the waste pulp plate material.

The shape of the waste pulp pallet in the present invention is limited to a single-sided four-port pallet as shown in FIG. 4 (a) or a single-sided two-port pallet as shown in FIG. 4 (b). is not. For example, another waste pulp plate may be attached to the bottom surface of the support leg 51 in FIG. 4A (the surface opposite to the surface on which the waste pulp plate is attached) to form a double-sided four-port pallet. Further, another waste pulp plate material can be attached to the bottom surface (the surface opposite to the waste pulp plate attachment surface side) of the support leg 52 in FIG.

In the present invention, the surface of the waste pulp board is preferably subjected to a waterproof treatment. FIGS. 5A and 5B are explanatory diagrams showing a process of performing a surface waterproofing process on the waste pulp board material 1 produced in FIG. As shown in FIG. 5A, first, the waste pulp board 1 is sent to a coating machine 31, and a waterproof material, for example, a wax, a urea resin, a melamine resin, or the like is applied to the surface of the waste pulp board 1.
Next, this waste pulp board material 1a can be produced by sending this waste pulp board material to the drying chamber 32 and drying the surface material. Thus, by performing the waterproofing treatment on the surface of the waste pulp board material 1, it can be isolated from the moisture in the atmosphere.

In the case where the surface of the waste pulp board 1 is subjected to waterproof treatment, a waterproof and abrasion resistant material such as aluminum oxide or silicon oxide is used together with the waterproof material to provide the waste pulp board with water resistance and wear resistance. It is also possible to impart both gender properties.

Alternatively, as shown in FIG. 5B, the waste pulp board 1 is sent to a coating machine 33, and a gel (urea resin, melamine resin, adhesive, etc.) is applied to the surface of the waste pulp board 1. To make it sticky. Next, this is sent to the coating machine 34, and various film materials are
For example, paper, a waterproof film, or the like is adhered. Subsequently, by sending this waste pulp board to the oven 35 and drying it,
The waste pulp board material 1b having been subjected to the waterproof treatment can be manufactured.

Using the waterproofed waste pulp board material thus obtained, the tensile strength and flexural strength were measured. That is, a test was performed by requesting a material testing laboratory of the mechanical processing technology system of the National Taiwan University of Science and Technology, and the size was 79.4 mm in width.
× Thickness of 11 mm is converted to German Industrial Standard DIN 52350
No. 52352 and DIN 52360-52362 according to the standard test method (when the thickness exceeds 10 mm, a span of 240 mm is employed). As a result, the maximum tensile load is 1460 kg,
The maximum bending load was 97.5 kg. Thereby, the tensile strength is 167 kg / cm ² and the bending strength is 36.
It can be calculated that it is 5 kg / cm ² . Therefore,
It turns out that the said waste pulp board material has excellent tensile strength and bending strength.

[0030]

As described above, according to the present invention, since the waste pulp is subjected to a high-pressure pressing treatment, the distance between the fiber molecules of the waste pulp is reduced, a strong hydrogen bond is formed, and the waste pulp excellent in strength is formed. Pulp board material can be manufactured. Therefore, the waste pulp pallet of the present invention using this waste pulp board has the same strength as a conventional wooden pallet. Further, since the waste pulp board is produced by the high-pressure pressing treatment as described above, a plurality of sticking operations as in the case of using conventional product paper are not required, and the cost is reduced accordingly. Furthermore, the present invention uses recovered paper such as waste paper as a raw material for waste pulp pallets,
It does not consume a lot of wood like a wooden pallet. Therefore, it is useful for environmental protection and the production cost can be kept low. Moreover, the recovered paper such as waste paper as the raw material of the waste pulp can be of any size or material, and the paper resources can be completely recovered and reused. Furthermore, collected paper such as waste paper used as a raw material of waste pulp does not need to be adjusted in color and does not require bleaching or the like performed in the process of producing product paper, so that a large amount of wastewater is not generated. There is no risk of causing environmental pollution. In addition, according to the present invention, since all the water escaped from the pulp is recovered by the pulp, the water can be reused.

When the surface of the waste pulp plate is subjected to a waterproof treatment, a waste pulp pallet having a waterproof property can be obtained and can be isolated from atmospheric moisture. Is further improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a process of producing waste pulp from waste paper and adjusting a solid content in the waste pulp to a predetermined range.

FIG. 2 is an explanatory view showing a step of forming a waste pulp board from waste pulp.

FIG. 3 is an explanatory view showing a step of attaching a support leg to a bottom surface of a waste pulp plate material.

FIGS. 4A and 4B are perspective views showing the bottom surface of an integrally formed waste pulp pallet in which a support leg and a waste pulp plate are integrally formed.

FIGS. 5A and 5B are explanatory views showing a step of performing a surface waterproofing treatment on a waste pulp plate material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waste pulp board material 1a Waterproofed waste pulp board material 1b Waterproofed waste pulp board material 11 Pulpa 12 Sand basin 13 Vibrating sieve 14 Pulp pool 15 Miscellaneous separator 16 Oblique sieve 17 Pulp pool 21 Measuring bucket 22 Pressure forming hydraulic press 23 Hot air drying device 24 Microwave drying room 31 Coating machine 32 Drying room 33 Coating machine 34 Coating machine 35 Oven 41 Support leg 42 Nail 51,52 Support leg

Claims (5)

[Claims] 1. A waste pulp having a solid content of 0.5 to 18 weights.
And adjusting the waste pulp to a mold, vacuum dehydration treatment and pressure
~ 1000kg / cm ^TwoUnder high pressure
By doing so, the solids content is 50-60% by weight
The process of forming the waste pulp board and the drying process
Pulp board material having a content of 90 to 95% by weight
Waste pulp pallet, comprising:
Production method 2. The method for producing a waste pulp pallet according to claim 1, further comprising a step of attaching a support leg to a bottom surface of the waste pulp plate material. 3. The waste pulp is fed into a mold and subjected to vacuum dehydration treatment and high-pressure pressing treatment under a pressure of 15 to 1000 kg / cm ² , so that the solid content is reduced to 50 to 100 kg / cm ^2.
The method for producing a waste pulp pallet according to claim 1, wherein the step of forming the waste pulp plate material of 60% by weight is a step of forming a waste pulp plate material with the support legs integrally formed. 4. The method for producing a waste pulp pallet according to claim 1, further comprising a step of performing a waterproof treatment on the surface of the waste pulp plate material. 5. A waste pulp pallet obtained by the method according to claim 1.