JPH0679800U - Pulp molding equipment - Google Patents

Abstract

(57) [Summary] [Purpose] A pulp mold that can improve the size and shape accuracy of the pulp mold more than before, and that facilitates the work / attachment work of the net and the release of the molded pulp mold from the net. A molding device is provided. In the pulp mold molding apparatus 10, a net body 26 that is deformed into a shape along the molding surface 20 by the suction of the pulp sludge is provided on the molding surface 20 of the pulp mold 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a molding device for a pulp mold, which molds a pulp mold from pulp slurry.

[0002]

[Prior art]

 When carrying a predetermined product or the like, the product or the like is packed in a packaging material having a recess corresponding to the shape of the product or the like. Such a packing material is usually made of a relatively expensive material such as expanded polystyrene, which causes a high cost and is difficult to dispose of.

On the other hand, a packaging material is manufactured from pulp of waste paper such as cardboard and newspaper for the purpose of effectively utilizing collected resources, and such packaging material is called a pulp mold. There is. Such a pulp mold usually uses a molding die having a molding surface of a shape corresponding to the molding surface and a large number of suction holes formed in the molding surface. It is manufactured by sucking pulp from the suction hole while being immersed in the mold and adsorbing the pulp to its molding surface, and by releasing from the mold and then drying with hot air in a drying furnace.

[0004]

[Issues to be solved by the device]

 In the molding of the pulp mold, if the pulp slurry is directly adsorbed on the molding surface, the pulp slurry is adsorbed only around the suction hole, and a predetermined pulp mold is not formed. For this reason, it has been practiced to fix a metal mesh body having a metal mesh conforming to the shape of the molding surface on the molding surface and to adsorb the pulp sludge onto the metal mesh body.

However, in such a metal net body, since it is necessary to process and attach the metal net in accordance with the shape of the molding die, it requires skill to perform the work, the working time becomes great, and the dimensional accuracy is high. It is difficult to obtain a high-precision pulp mold even if the mold is made with high precision because it is affected by the workability of the mold. Had a problem that it was difficult to release the mold due to the friction generated between the adsorption-molded pulp sludge and the net, and it was difficult to obtain higher precision.

The present invention has been made in view of the above circumstances, and its purpose is to improve the size and shape accuracy of a pulp mold more than before, and to process, attach and mold a net body. An object of the present invention is to provide a pulp mold forming apparatus that allows easy release of the formed pulp mold from the net body.

[0007]

[Means for Solving the Problems]

 In order to achieve such an object, the gist of the present invention is to use a molding die having a molding surface of a predetermined shape and having a large number of suction holes opened on the molding surface. In a pulp mold forming apparatus that sucks the pulp in the pulp slurry by sucking it from the suction hole while being immersed in the pulp slurry, the net body that is deformed into a shape along the molding surface by the suction is It is provided on the molding surface of the mold.

[0008]

[Effect of action and device]

 In this way, since the mesh body is adsorbed and deformed along the molding surface at least during suction, the pulp mold size and shape accuracy is determined by the molding die and high precision is obtained. Further, in the processing and mounting work of the mesh body, it is sufficient if the mesh body is processed and mounted so as to be able to follow the molding surface while maintaining the required strength when deformed. Work becomes easy. Further, in the mold shape having the recess formed by the wall surface substantially perpendicular to the molding surface as described above, since the mesh body can be deformed with the movement of the pulp mold at the time of mold release, the mold release is conventionally performed. It will be easier than that.

[0009]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a view showing a main part of a pulp mold forming apparatus 10, and is a view showing a mounted state of a pulp mold forming die (hereinafter, simply referred to as a forming die) 12. A flat box-shaped mold holder 16 is fixed to the tip of the support arm 14, and the pulp mold 12 is fixed to the mold holder 16 with bolts 18. The molding die 12 includes a molding surface 20 having an uneven shape corresponding to the shape of the molded product, and a large number of suction holes 22 penetrating in the thickness direction and opening in the molding surface 20. A space 24 is formed between the space 6 and the space 6. The molding surface 20 of the molding die 12 is covered with a mesh body 26, and the mesh body 26 is formed on the molding die 12 above the mold holder 16 of the molding die 12. It is fixed by such means as local adhesion to 28, screwing, or by sandwiching it on the joint surface 30 between the mold 12 and the mold holder 16 and tightening it with the bolt 18. A part of the mesh 26 is in close contact with the molding die 12 along the molding surface 20, but the other part has a shape different from that of the molding surface 20 and is located apart from the molding surface 20. is doing.

Further, the net body 26 is entirely constituted by a so-called stretchable fabric having a thickness of, for example, about 0.5 mm. This stretchable woven fabric is a relatively thin material used for nylon stockings and is made by weaving a raw yarn such as nylon 66 with a predetermined weave and yarn density, and has a stretch ratio of about 30 to 50%. Have

The space 24 is connected to a suction pump 36 through a vertical through hole 32 of the support arm 14 and a drain tank 34. The suction pump 36 creates a negative pressure in the space 24, and It is adapted to be sucked from the suction hole 22. The water stored in the drain tank 34 is appropriately discharged by the discharge pump 38.

The pulp mold forming apparatus 10 is provided with a liquid tank (not shown) for storing pulp slurry in a slurry state in which about 1% by weight of pulp is dispersed in water, and the supporting arm 14 is rotated around a horizontal axis. By rotating the support shaft that rotatably supports the pulp mold, the mold 12 for pulp molding fixed to the tip of the support arm 14 is immersed in the pulp slurry for a predetermined time. During this immersion period, when the space 24 is made negative pressure by the suction pump 36 and sucked through the suction holes 22, the net body 26 is deformed into a shape along the molding surface 20, as shown by the solid line in FIG. As described above, it is brought into close contact with the molding surface 20. Then, when the pulp slurry is sucked through the suction hole 22, the pulp is adsorbed on the net body 26 of the molding surface 20, and the pulp mold 40 shown in FIG. 2, which is the molding target, is molded. . This pulp mold 40 is sucked and dehydrated by continuing suction from the suction hole 22 for a predetermined period after the pulp mold 12 is pulled out of the liquid tank, and the water content is reduced to about 75%. After being released, it is released from the mold and dried in a dryer with hot air before it is used as a packaging material.

Here, in this embodiment, the net body 26 is made of a stretchable woven fabric, and the net body 26 adheres to the molding surface 20 at the time of suction to form a shape along the molding surface 20. Therefore, the precision of the size and shape of the pulp mold 40 is not affected by the processing precision of the metal net body as in the prior art, and high precision can be obtained according to the processing precision of the forming die 12.

Further, when the net body 26 is fixed to the molding die 12 without being completely adhered to the molding surface 20, the net body 26 is deformed into a shape along the molding surface 20 during suction of pulp sludge. Therefore, it is possible to form the pulp mold 40 having a predetermined shape without requiring the labor of previously processing the metal net body into a predetermined shape as in the conventional case. Therefore, processing and mounting work becomes extremely easy.

Further, even when the molding die 12 is provided with a concave portion having a wall surface 42 substantially perpendicular to the upper surface of the molding surface 20 as in this embodiment, as shown by a broken line 44 or a broken line 46 in FIG. Since the net body 26 is appropriately deformed along with the movement of the pulp mold 40 at the time of releasing, the releasing is easily performed even in the case of the concave portion having a small draft. With such a shape, when a wire net is used for the net 26 as in the conventional case, since the net 26 is hardly deformed, the friction between the pulp mold 40 and the net 26 becomes large and the mesh is separated. The mold became difficult, and eventually the wall surface 48 of the pulp mold 40 was partially damaged, making it difficult to maintain the shape and dimensional accuracy.

Further, since the net body 26 requires almost no processing when it is fixed to the forming die 12, problems such as breakage of the net body 26, dirt, and clogging of the suction holes 22 of the forming die 12 occur. In this case, the net body 26 can be immediately removed and attached, and the mold 12 can be easily washed, so that the operating rate of the apparatus can be increased.

Although one embodiment of the present invention has been described in detail above, the present invention can be implemented in another mode.

In the above-mentioned embodiment, the whole net body 26 is made of the stretchable fabric, but the part which is not particularly difficult to process the wire net, for example, the part corresponding to the side wall 28 of the forming die 12 is made of the wire net. Alternatively, only the uneven portion may be made of stretch fabric.

In addition to the stretchable woven fabric obtained by weaving the nylon 66 in a predetermined weave, the net body 26 also includes a stretchable woven fabric using a textured yarn in which the fiber itself has stretchability, and a porous resin. A stretchable woven fabric provided with a membrane or a resin membrane may be used, which is made of breathable and flexible fibers or sheets. The net body can be deformed by the suction and can be closely attached to the molding surface, and a gap is formed between the net body and the molding surface to allow the water sucked from the pulp slurry to flow therethrough. Anything is fine. The stretchability is not always necessary, and the shape after the deformation may be substantially maintained after the deformation and contact by a single suction.

The mesh 26 may be provided so as to cover the molding surface 20 of the molding die 12 via a metal mesh, or may be formed by stacking a plurality of stretchable fabrics, a porous resin film, or the like. May be.

The molding die used in the present invention may be not only the aluminum casting that has been conventionally used, but also other metal molds, resin molds and the like.

Although not listed one by one, the present invention can be variously modified without departing from the spirit thereof.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of an example of a pulp molding apparatus of the present invention.

FIG. 2 is a cross-sectional view showing a pulp mold formed by the pulp mold forming apparatus in FIG.

FIG. 3 is a cross-sectional view of main parts for explaining the movement of the net body in the pulp mold molding apparatus of FIG.

[Explanation of sign]

 10: Pulp mold molding device 12: Mold for pulp mold 20: Molding surface 22: Suction hole 26: Net

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Noritake Company Limited 1-36-36 Noritake Shinmachi, Nishi-ku, Nagoya, Aichi Prefecture, Shimomura Noritake Co., Ltd. (72) Tokiyoshi Hirano, Noritake Shinmachi, Nishi-ku, Nagoya, Aichi No. 1-36 Noritake Company Limited Limited

Claims (1)

[Scope of utility model registration request] 1. A molding die having a molding surface of a predetermined shape and having a large number of suction holes opened in the molding surface is used.
In a pulp mold molding apparatus for sucking the pulp in the pulp slurry by sucking through the suction holes in a state where the molding surface is immersed in the pulp slurry, a net body that is deformed into a shape along the molding surface by the suction is formed. A pulp molding apparatus provided on the molding surface of the molding die.