JPH10259600A - Wet molding of pulp material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the accurate adjustment of the shape of a pulp fiber molded product and finish thereof when producing the molded product by a wet molding method. SOLUTION: Removed water from a bottom force 1 is forcibly adsorbed to bring a coagulated laminate of pulp fibers into close contact with the bottom force 1 at the time of nipping and pressing of a top force 2 and the bottom force 1 and separation thereof when compressing a pulp slurry by nipping and pressing the top force 2 and the bottom force 1 having required molding shapes in opposite faces, dehydrating the pulp slurry and thereby forming the coagulated laminate of the pulp fibers.

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 pulp material condensed molded product such as a buffer packing for packing by a wet method using pulp material waste such as waste paper and pulp waste material as a raw material.

[0002]

2. Description of the Related Art Conventionally, in order to reuse old newspaper, old corrugated cardboard paper, old cardboard paper, paper cutting waste, and waste pulp, these waste paper and waste pulp are defibrated in water to prepare a pulp slurry. This pulp slurry was compressed and dehydrated to condense into a predetermined shape, thereby producing a molded product. The conventional manufacturing method will be described in detail.A lower mold having an uneven surface is formed so as to correspond to a use surface of a required molded product, and a wire mesh is stretched along the uneven surface of the lower mold, and the concave contact surface is formed. A large number of dehydration holes are provided in the lower mold so as to pass through, and the upper mold having a compression surface with a shape corresponding to the opposite surface of the uneven surface is installed above the lower mold so as to move up and down, and in the tank during molding work When the pulp slurry is poured into the upper part of the lower mold, the pulp fibers in the pulp slurry accumulate on the lower metal mesh, and water is discharged below the wire mesh and the dewatering holes. The layer is compressed by lowering the upper mold, strongly dewatered and shaped, and then the pulp fiber condensation laminate on the wire mesh is removed to produce a molded article.

[0003]

In the above prior art, when the pulp fiber condensed laminate is formed, water in the pulp slurry passes through a wire mesh and is naturally dropped from a lower mold to be dewatered and removed. This has been done by shaping the upper solidified laminate on the lower mold by compressing the upper mold and forcing water out. After the molding is completed, the upper mold rises and separates from the solidified laminate, but as shown in FIG. 6 (B), the angle between the concave portion M of the lower mold 1 and the convex portion N of the upper mold 2 is close to a plane. The larger the upper die 2 is, the smaller the friction against the molding surface of the solidified laminate E when the upper die 2 moves up, and the more smoothly the upper die 2 separates. However, as shown in FIG. 6 (A), the smaller the angle P formed by the concave portion M of the lower die 1 and the convex portion N of the upper die 2 with respect to the plane, the upper die 2 rises. In addition, the friction of the solidified laminate E with respect to the molding surface is long and strong, and the shape is destroyed. In particular, the molding surface is fluffed and scratched, resulting in defective products. The present invention is intended to improve the precision of the shape of a molded product by smoothly removing the mold from the lower mold 1 regardless of the angle of the unevenness.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional deficiencies, and a method thereof will be described below in detail with reference to an embodiment shown in FIGS. That is, in the lower view of the upper die 2 which is pressurized and moved vertically by the air cylinder 4 vertically, a concavo-convex surface 5 having a required molded shape is formed. At the lower corresponding position of the upper die 2 that moves vertically,
The lower mold 1 provided with the uneven surface 6 having a shape corresponding to the uneven surface 5 is fixedly provided, and the wire mesh 3 is stretched along the uneven surface 6 of the lower mold 1. Water absorbing plate 7 on the lower surface to which the lower mold 1 is detachably fixed
A water absorption box 8 is erected below. The water absorbing plate 7 is provided with a number of water holes (not shown) so as to communicate the lower mold 1 and the water absorbing box 8. A water absorption hose 9 connected to a water absorption pump (not shown) is connected to the water absorption box 8. In addition,
A filtration device (not shown) for removing fine dust contained in water is interposed in the middle of the water absorption hose 9 in a usual manner. A watertight slurry box 10 is provided on the outer periphery of the lower mold 1 so that the upper mold 2 can be moved up and down. The slurry box 10 is provided with a hanging rod 11 vertically moved up and down by an elevating device (not shown) such as an air cylinder. The slurry pulp 12 for injecting the pipe slurry S is connected to one side of the slurry box 10.

[0005]

FIG. 1 shows the original position before operation. Second
In the figure, the lifting of the suspension rod 11 raises the slurry box 10 so that the lower mold 1 is located at the lower portion of the inside of the slurry box 10, and the upper portion thereof is in a box-shaped hollow state and temporarily stops. Then, the pulp slurry S is sent into the slurry box 10 by the slurry pipe 12. FIG. 3 shows the slurry box 10
When the required amount of the pulp slurry S is supplied into the inside of the air cylinder 4, the upper mold 2 is lowered by the operation of the air cylinder 4. 4th
In the figure, the upper die 2 presses the pulp slurry S on the lower die 1 while descending, and at the same time, forcibly sucks water through the water absorption hose 9 and the water absorption box 8. Due to the sandwiching pressure between the upper mold 2 and the lower mold 1, the pulp slurry S is forcibly extracted from the pulp slurry S and becomes a solidified laminate E of fibers. FIG. 5 shows that after the solidified laminate E of the fiber is formed, the suspension rod 11 is lowered and the slurry box 1 is lowered.
0 is also lowered to expose the lower mold 1 and the upper mold 2 is raised by the operation of the air cylinder 4. Thereafter, the coagulated laminate E of the fiber exposed on the lower mold 1 is detached from the lower mold 1 by a suction peeling device (not shown) or the like, and is taken out. When the upper mold 2 is raised above the lower mold 1, it is important that the water absorbing action, that is, the suction action, is continuously performed via the water absorbing hose 9 and the water absorbing box 8. When the uneven surface 5 of the upper mold 2 is peeled off from the coagulated fiber laminate E, frictional resistance is generated, but the coagulated fiber E is continued due to the continuous suction operation.
Because the is in close contact with the lower mold 1, it can be smoothly peeled to prevent the occurrence of shape collapse, and a molded product having a required correct shape can be obtained.

[0006]

According to the method of the present invention, the pulp slurry S is adsorbed on the lower mold 1 and is strongly sucked and drawn at the same time. It does not damage the surface of the solidified laminate E of the fibers. Even if the required unevenness of the shape of the molded product is large and the angle to the base surface is steep, the shape of the surface to be molded is accurate and adjusted, and excellent products can be obtained with few defects .

[Brief description of the drawings]

1 to 5 are schematic views of an apparatus shown as an example for implementing the method of the present invention.

FIG. 6 is an enlarged view of a main part for explaining the purpose of the method of the present invention.

[Explanation of symbols]

 Reference Signs List 1 lower die 2 upper die 3 wire mesh 4 air cylinder 5 upper die uneven surface 6 lower die uneven surface 7 water absorption plate 8 water absorption box 9 water absorption hose 10 slurry box 11 suspension rod 12 slurry pipe E fiber condensed laminate M lower mold Concave part of N upper convex part of O type large angle of P type small angle of S type pulp slurry

Claims (1)

[Claims] When a pulp slurry is compressed and dewatered by pressing between an upper mold and a lower mold having a required molding shape on opposing surfaces, a solidified laminate of pulp fibers is formed. A pulp material wet molding method characterized in that dehydration from the lower mold is forcibly adsorbed during clamping and when the upper mold and the lower mold are separated, and the solidified laminate of pulp fibers is brought into close contact with the lower mold.