JPH06320300A - Method and device for compression molding of wadding made of waste paper or pulp - Google Patents

Abstract

PURPOSE:To attain soft feeling by which the surface of a packed article is not scratched, and high strength, and to form wadding possible to form to a complex shape and possible to use for a use covering a wide range. CONSTITUTION:A take-out receiving lower die 13 with a through hole 13a, is provided on one end side of a cylindrical molding flask 12. A movable core 14 is freely retractably arranged in the through hole 13a of this take-out receiving lower die 13. A take-out compression upper die 41 compressing a raw material by projecting and moving in the molding flask 12 by a jack 42 for compression, is provided on the other end side of the molding flask 12. A jack for retracting a core, which retracts the movable core 14 by linking to the jack 42 for compression, is provided. Consequently, compressibilities of core parts with different thicknesses and a part without a core, are made uniform, and the overall density is made uniform.

Description

Detailed Description of the Invention

[0001]

The present invention has a water content of 20% to 20%.
Using 50% dry defibrated waste paper or pulp as the raw material,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for compression molding a waste paper or pulp cushioning material for compression-molding a cushioning material having a complicated shape.

[0002]

2. Description of the Related Art Conventionally, most of the materials used as a cushioning material for packing are synthetic resins such as Styrofoam and vinyl chloride. However, most of this buffer material is discarded without being collected, is not naturally decomposed as garbage, and has many problems such as high temperature and high heat even when incinerated to damage the incinerator.

Therefore, there is a great demand for a substitute for a synthetic resin cushioning material, and for example, a pulp-molded article made from waste paper or pulp is considered. In addition, a cushioning material using a paper tube and a compression molded pulp molded product are also used.

[0004]

However, this pulp-molded product has a high density because the waste paper fiber is dissolved in water in an amount of about 1 to 2% by weight, and this solution is dehydrated by vacuum papermaking and dried. The surface is hard. Therefore, the painted surface of the packaged item may be damaged. Further, this manufacturing method has a problem that it cannot be used for applications requiring strength because of its limited thickness.

Further, the cushioning material using a paper tube and the pulp-molded product molded by compression cannot be used for those having a complicated shape, and there is a problem that the use is limited.
INDUSTRIAL APPLICABILITY The present invention solves the above problems and provides a soft feel that does not damage the surface of a packaged product, high strength and excellent shock absorption, and can be molded into a complicated shape for use in a wide range of applications. An object of the present invention is to provide a compression molding method and apparatus for a waste paper or pulp cushioning material.

[0006]

In order to solve the above-mentioned problems, a compression molding method for a waste paper or pulp cushioning material according to the present invention is provided in a cylindrical mold having a core arranged at one end thereof. A dry raw material consisting of refined waste paper or pulp is charged in a volume that is a multiple of the volume of the molded body, the compression mold is fitted from the other end side and moved to one end side to compress the raw material between the receiving mold and The child is retracted to a predetermined position in association with the compression movement of the compression mold and compression-molded into a predetermined shape.

In the first construction of the compression molding apparatus for waste paper or pulp cushioning material, a receiving die having a through hole is provided on one end side of a cylindrical mold, and the core is retracted into the through hole of the receiving die. A compression die, which is arranged freely, is provided on the other end side of the mold to project the raw material into the mold by compression driving means and compresses the raw material, and a raw material supply means for supplying the raw material into the mold. A core retracting means for retracting the core in association with the driving means is provided.

In the second structure, in addition to the above structure, a take-out mold is detachably provided in the compression molding portion on one end side of the mold, and the compression mold is made removable to the compression drive means, and the core is The take-out mold configured to include a base core connected to the child retracting means and a take-out core that is detachably attached to the base core and is located in the take-out mold during compression molding, and covers the outer surface of the molded body during compression molding. The compression mold, the receiving mold, and the take-out core are slidable in the direction orthogonal to the raw material compression direction.

In addition to the second configuration, the third configuration further includes
In the base core, a positioning member that is retracted by the retracting means is provided, and a positioning recess into which the positioning member can be fitted is formed in the extraction core.

[0010]

According to the above structure, the compression ratio of the core portion and the other portions having different thicknesses is made uniform by compressing with the compression mold and at the same time moving the core backward. It is possible to obtain, and it is possible to perform compression molding of a molded product that is optimum as a cushioning material in terms of shock absorption and strength.

Further, according to the second structure, the molded body is taken out in a state in which the outer surface is covered with the take-out mold, the compression mold, the receiving die and the take-out core. Can be taken out. Further, the next molding can be performed by simply mounting a new take-out form, compression mold, receiving die, and take-out core, and mass production becomes possible.

According to the third construction, the take-out core mounted on the base core is retracted from the positioning member provided in the base core and fitted into the positioning recess of the take-out core. Therefore, there is no positional deviation during compression molding, and the take-out core is quickly separated from the base core by retracting the positioning member from the positioning recess when taking out the molded body.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a compression molding apparatus for waste paper or pulp cushioning material according to the present invention will be described below with reference to the drawings.

This compression molding apparatus has a water content of 20%.
As a raw material M, -50% by weight of dried defibrated waste paper or pulp is used, for example, as shown in FIG.
A rectangular box-shaped molded body R whose lower surface is opened by S and one bottom wall portion RT is compression-molded, and this molded body R is divided into four parts as shown by an imaginary line for packaging. Used as a corner cushioning material. Of course, other complex shapes are possible.

As shown in FIGS. 1 to 3, this compression molding apparatus is provided with a molding frame 2 and a molded product take-out portion 3 arranged in the central portion of a gantry frame 1 and an upper portion of the gantry frame 1. And a raw material supply section (raw material supply means) 4 and a compression drive section (compression drive means) 5.

In the molding frame part 2, a rectangular cylindrical mold frame 12 is vertically arranged on a horizontal substrate 11 via a supporting member 10. Below the mold frame 12, a take-out receiving mold (receiving mold) ) 13 is arranged in the opening 11 a of the horizontal substrate 11. The take-out receiving mold 13 has a square through hole 13a in which a movable core (core) 14 is vertically movable and a large number of suction holes 13b. Further, the horizontal substrate 11 is provided with a vacuum container 15 which communicates with the inside of the mold 12 through the suction holes 13b of the take-out receiving mold 13. A vacuum pump is connected to the exhaust port 15a of the vacuum container 15 through an exhaust duct, and the form 12 is supplied when the raw material is supplied.
The air inside is sucked through the suction holes 13b, and the raw material M is transferred to the mold 1
It is evenly supplied and deposited in the inner part of the second part.

The movable core 14 includes a base core 14a,
And a take-out core 14b detachably attached to the upper part of the base core 14a. The take-out core 14b is located above the take-out receiving mold 13 in the compact R at the compression molding position,
It is configured so that it can be taken out together with the molded body R. That is, the positioning pin 14d and the pin push-out cylinder (ejecting / retracting device) 14e for moving the positioning pin 14d up and down are formed in the recess 14c formed in the base core 14a and having the upper surface opened. There is. Further, a positioning hole (positioning recess) 14f into which the positioning pin 14d can be fitted is formed on the lower surface of the take-out core 14b,
The positioning pin 14d, which is projected at the time of supplying the raw material and at the time of compression molding, is fitted into the positioning hole 14f and is taken out from the core 14
b is fixed in position on the base core 14a. Reference numeral 14g is a communication hole formed in the base core 14a and connecting the interior of the recess 14a with the interior of the vacuum container 15, and the pipe of the pin retracting cylinder 14e and the suction core 14b are fixed by suction.

Actuating rod 1 connected to the base core 14a
Reference numeral 6 passes through the bottom of the vacuum container 15 and is connected to an operating frame 17 in the front-rear direction, and output rods of a core retracting jack (core retracting means) 18 are connected to both ends of the operating frame 17, respectively. There is. Therefore, the core retreating jack 18 is expanded and contracted, and the movable core 14 is moved up and down via the operating rod 16.

The mold 12 has an upper fixed mold 12a supported by the support member 10 and a take-out mold which is slidably arranged in the lower part of the fixed mold 12a in the left-right direction orthogonal to the raw material compression direction. 12b and. Further, an extraction compression upper mold (compression mold) 41 for compressing the raw material M in the mold 12
Is detachably provided on the output rod 42a of the compression drive unit 5. In the molded product unloading section 3, the molded product R, which is compressed and has resilience, is thus sealed with the unloading mold 12b, the unloading receiving mold 13, the unloading core 14b, and the unloading compression upper mold 41. It is configured so that it can be taken out. In order to achieve this object, the take-out mold 12b is slid together with the take-out receiving mold 13, the take-out core 14b, and the take-out compression upper mold 41 on both left and right sides of the mold 12 on the horizontal substrate 11 to form a molded body. A pair of molded body take-out jacks 19A and 19B for taking out R are respectively arranged.

The raw material supply unit 4 and the compression drive unit 5 are arranged on a slide base 22 which is movably arranged on the gantry frame 1 via a pair of guide rails 21. With the switching jack 23, the slide base 22 can be slid in the left-right direction by a predetermined stroke to move the raw material supply unit 4 on the right side and the compression drive unit 5 on the left side to work positions above the formwork 12, respectively.

The raw material supply unit 4 includes a raw material supply motor 3
Raw material hopper 3 having an agitator 32 which is rotationally driven to 1
3 are arranged. Below the raw material hopper 33, a screw feeder 34, which is rotated by the raw material supply motor 31 and cuts out the raw material M in a fixed amount, is provided. Further, at the lower end portion of the raw material supply cylinder 35 connected to the outlet of the screw feeder 34, the expansion / contraction portion 35a is provided.
Is attached, and a plate-like connection cover 36 that covers the upper opening of the mold 12 is provided on the expandable portion 35a. The pair of left and right connecting cylinders 37 are connected to the connecting cover 3.
6, the connection cover 36 is moved up and down to move the raw material supply cylinder 3
5 is connected to the formwork 12. In addition, this connection cover 35
Is provided with a plurality of air nozzles 38, and stirring air is blown into the mold 12 from the air nozzles 38 at the time of supplying the raw material to perform floating stirring to uniformly fill the raw material M into the mold 12.

A compression jack (compression means) 42 is vertically attached to the slide base 22 of the compression drive section 5, and a take-out compression upper die 41 is attached to and detached from a drive rod 42a of the compression jack 42. Suction plate 4 that can be attached freely
3 is provided. The suction plate 43 is formed with a suction air hole 44 communicating with a suction recess 43a formed in the central portion of the lower surface, and a suction hose (not shown) is connected to the suction air hole 44.

By the way, in this compression molding apparatus, the compression-molded compact R has a take-out mold 12b and a take-out receiving die 13
The take-out core 14b and the take-out compression upper die 41 are taken out in a sealed state, and the molded body R is carried into a drying device and dried and molded in that state. At this time, for the purpose of uniformly discharging and drying the water contained in the molded body R, as shown in FIGS. 5 and 6, the take-out mold 12b, the take-out receiving die 13 and the take-out compression upper die 41 are provided with a large number of pieces. Small diameter holes for drying 51A, 51
B, 13b (also serving as suction holes), and 52 are formed. However, when the material is charged, the raw material M is evenly supplied to the inner part of the mold 12, so that the mold 1 is supplied from the air nozzle 38.
The agitating air blown into 2 is sucked through the suction holes 13b of the take-out receiving die 13 to form a vertical air flow in the form 12, and at this time, the small-diameter holes formed in the take-out form 12b. If 51A and 51B are opened, the air flow may be disturbed and the filling effect may be hindered. For the purpose of eliminating this, the take-out formwork 1 at the time of supplying the raw material and at the time of compression shaping
Sealing device 53 for closing the small diameter holes 51A and 51B of 2b
Is provided.

The sealing device 53 is composed of sealing plates 54A and 54B to which a soft rubber sealing material 54a is attached, and a pressure welding cylinder device for pressing the sealing plates 54A and 54B against the outer surface of the take-out form 12b. Formwork 12
Pressing cylinders 55A and 55B for closing the small drying holes 51B on the front and rear surfaces of b are arranged at the front and rear positions of the mold 12 on the horizontal substrate 11, respectively. Formed product take-out jacks 19A and 19B are also used for the left and right pressure contact cylinders to be closed. The suction small plate 52 formed in the extraction compression upper mold 41 is in a state of being closed by abutting the suction plate 43 during compression molding.

The molded body R taken out is tightly bound by a banding device at a take-out position by a binding device (not shown) so that the shape of the molded body R is retained and conveyed to a drying device. Since it is not directly related, the description is omitted.

Next, the compression molding method for the waste paper or pulp cushioning material will be described with reference to FIGS. 4 and 5. (1) With the fixed mold 12a raised along the supporting member 10 and the base core 14a lowered to the compression molding position, the take-out receiving mold 13, the take-out core 14b, and the take-out mold 12b.
Are placed and positioned. Then, the pin push-out cylinder 14e is extended, the positioning pin 14d is fitted into the positioning hole 14f, and the take-out core 14b is set to the base core 1.
4a is positioned and fixed.

(2) The fixed mold 12a is lowered and connected to the take-out form 12b, and the molded product take-out jacks 19A, 1
9B and the pressure contact cylinders 55A, 55B are extended, the seal plates 54A, 54B are brought into contact with the side surfaces of the take-out form 12b, respectively, and the small drying holes 51A, 51B are closed. At the same time, the switching jack 23 is contracted, the raw material supply part 4 is stopped above the molding form part 2, the connection cylinder 37 is advanced, and the connection cover 36 is pressed against the upper opening of the form frame 12, The supply cylinder 35 is connected to the mold 12.

(3) The screw feeder 34 is driven by the raw material supply motor 31, and the raw material M is fed out in a constant amount from the raw material hopper 33 in which one raw material M of the compact R has been charged in advance. It is supplied from the raw material supply cylinder 35 into the mold 12. At this time, a negative pressure is applied to the inside of the vacuum container 15 so that the air inside the mold 12 is sucked through the suction holes 13b, an air flow from above to below is generated in the mold 12, and the raw material is deposited on the inlet side. It is prevented and the air nozzle 3
Stirring air is blown from 8 to stir and stir the raw material M, so that the raw material M is uniformly packed from the inner end of the side wall RS. [Fig. 4 (a)] (4) When all the raw material M in the raw material hopper 33 is supplied,
The raw material supply motor 31 is stopped. At this time, the filling capacity is a predetermined multiple N in the range of 2 to 6 times the volume of the molded body R. [FIG. 4 (b)] Here, assuming that the raw material density of the side wall molding portion RS 'without the movable core 14 and the raw material density of the bottom wall molding portion RT' with the movable core 14 are substantially constant, the side wall is The raw material height MH1 of the part forming portion RS ′ is the height RH1 × N of the side wall portion RS of the forming body R, and the raw material thickness MH2 of the bottom wall forming portion RT ′ is the bottom wall portion R of the forming body R.
The filling amount and the position of the movable core 14 are set so that the thickness T is RH2 × N.

(5) After the connection cover 36 is separated upward by the connection cylinder 37, the switching jack 23 is advanced and the compression drive unit 5 is stopped above the molding frame 2. Then, the compression jack 42 is advanced to fit the take-out compression upper mold 41 into the mold 12, and the compression jack 4
2 is further advanced to lower the take-out compression upper mold 41 at a predetermined speed to pressurize and compress the raw material M, and in conjunction with this, the core retreat jack 18 is advanced to move the movable core 14 out of the take-out compression. The mold 41 is lowered at a speed equal to or slightly lower than the compression lowering speed. Thereby, the side wall portion R of the molded body R
The S and the bottom wall portion RT are pressed and compressed at almost the same speed and ratio to be homogenized, so that a specific portion is not first compressed to a high density. [FIG. 4 (c)] (5) The take-out compression upper die 41 and the movable core 14 are lowered to a predetermined position and stopped to complete the molding. [FIG. 4 (d)] Next, the pin push-out cylinder 14e is contracted, the positioning pin 14d is removed from the positioning hole 14f, and the take-out core 14b of the movable core 14 and the base core 14a are separated. . Further, the pressure welding cylinders 55A and 55B are contracted so that the seal plate 55B is separated from the take-out form 12b. Then, at the same time that the molded body take-out jack 19A is contracted, the molded body take-out jack 19B is advanced, so that the molded body R is taken out of the take-out frame 12b, the take-out receiving die 13, and the take-out core 14b.
Then, the compact R is slid to the left on the horizontal substrate 11 together with the ejection compression upper die 41, and the compact R is taken out (FIG. 5). Then, the take-out form frame 12b, the take-out receiving mold 13, the take-out core 14b, and the take-out compression upper mold 41 are tightly bound by the band to prevent expansion and restoration of the molded body R, and it is carried into a drying device and dried. As a result, about 30 contained in the raw material M of the compact R
% Of water is reduced to about 10% to form a molded body R having no restorability, and the take-out mold 12b and the take-out receiving mold 1 are formed.
3, the take-out core 14b and the take-out compression upper die 41 are removed, and the molded body R is taken out.

In the above structure, the water content is 20% to
Raw material M consisting of 50% dry defibrated waste paper or pulp
Is a soft cotton-like material with an apparent specific gravity of 0.04 to 0.07 g / cm ^3, which has no flowability and becomes pill-shaped when mechanical force is applied, making uniform filling difficult. . However, in the above-described embodiment, when the raw material is supplied, the air in the mold 12 is sucked from the suction holes 13b of the take-out receiving mold 13, and the stirring air is blown into the mold 12 from the air nozzle 38, so that the raw material is supplied. The side wall RS and the bottom wall RT can be filled with M at a substantially uniform density.
Even if there is a difference in the packing density between the side wall portion RS and the bottom wall portion RT, it can be easily corrected by setting the stroke of the movable core 14.

Further, the raw material M is uniformly filled so that the respective parts having different thicknesses have a substantially constant volume within a range of 2 to 6 times the volume of the molded body R, and the compression lowering of the ejection compression upper die 41 is performed. At the same time, by retracting the movable core 14, the side wall portion RS and the bottom wall portion RT having different thicknesses are compressed at substantially the same speed ratio and compression ratio, and a uniform optimum density of 0.20 to 0.25 is obtained.
A molded body R in the range of g / cm ³ is molded. And the surface has a soft feel and does not damage the items to be packed,
It is possible to effectively absorb the impact from the outside and obtain a high-strength cushioning material without damage.

Further, the molded body R thus molded has a take-out mold 12b covering the outer surface thereof, a take-out receiving die 13, and a take-out core 14b.
Since it is carried out together with the take-out compression upper die 41, a new take-out form frame 12b, take-out receiving die 13, take-out core 14b and take-out compression upper die 41 can be mounted to perform the forming work of the next compact R. It can be performed and is extremely efficient and highly productive. Further, the take-out core 14b is attached and detached by the positioning pin 14d provided in the base core 12a, so that the take-out core 14b is not displaced during supply of raw materials and compression molding and can be easily attached and detached.

Furthermore, the molded body R taken out together with the take-out mold 12b, the take-out receiving mold 13, the take-out core 14b and the take-out compression upper mold 41 is dried as it is, Formed small holes 51A, 5 for drying
1B, a suction hole 13a formed in the take-out receiving die 13,
Since the drying small-diameter holes 53 formed in the take-out compression upper mold 41 cause the moisture in the inside to be evenly dispersed and evaporated,
A homogeneous molded body R can be obtained.

[0034]

As described above, according to the compression molding method and apparatus of the waste paper or pulp cushioning material of the present invention, the core portions having different thicknesses are compressed by the compression mold and at the same time the core is moved backward. By making the compression ratios of the other parts uniform, a molded product having a uniform density can be obtained as a whole, and a molded product which is optimum as a cushioning material in terms of impact absorption and strength can be compression molded.

Further, according to the second structure, the molded body is taken out in a state in which the outer surface is covered with the take-out mold, the compression mold, the receiving die and the take-out core. Can be taken out. Further, the next molding can be performed by simply mounting a new take-out form, compression mold, receiving die, and take-out core, and mass production becomes possible.

Further, according to the third structure, the take-out core mounted on the base core is fitted and fitted into the positioning concave portion of the take-out core by retracting the positioning member provided in the base core. Therefore, there is no displacement during compression molding, and when the molded body is taken out, the positioning member is retracted from the positioning recess, so that the take-out core is quickly and surely separated from the base core.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of a compression molding apparatus for waste paper or pulp cushioning material according to the present invention.

FIG. 2 is a side view of the compression molding apparatus.

FIG. 3 is a sectional view taken along line I-I shown in FIG.

FIG. 4 shows a molding frame portion of the compression molding apparatus, and
(D) is an explanatory view illustrating a molding operation.

FIG. 5 is a front cross-sectional view showing a compression molded state of a molded body.

FIG. 6 is a perspective view showing a taken-out state of a molded body.

FIG. 7 is a perspective view of a molded body.

[Explanation of symbols]

 R Molded material M Raw material 2 Molded mold part 3 Molded material take-out part 4 Raw material supply part 5 Compression drive part 12 Formwork 12a Fixed formwork 12b Takeout formwork 13 Takeout receiving mold 13a Through hole 13b Suction hole 14 Movable core 14a Base core 14b Extraction core 14c Recess 14d Positioning pin 14e Pin ejecting cylinder 14f Positioning hole 15 Vacuum container 18 Core retracting jack 19A, 19B Mold ejecting jack 33 Raw material hopper 34 Screw feeder 35 Raw material supply cylinder 38 Air nozzle 41 Extraction compression upper mold 42 Compression jack 51A, 51B Small diameter hole for drying 52 Small diameter hole for drying 53 Seal device 54A, 54B Seal plate 54a Seal material 55A, 55B Cylinder for pressure welding

Front page continuation (72) Inventor Shigeru Miyawaki 2-22-10-404 Tatehanamachi, Amagasaki City, Hyogo Prefecture (72) Inventor Seiichi Yonekawa 1-27-301 Asahigaoka Town, Ashiya City, Hyogo Prefecture (72) Invention Seita Ueda 5-3-8 Nishikujo, Konohana-ku, Osaka-shi, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Inventor Masahiro Takeda 5--3-28 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. ( 72) Inventor Keiji Koyanagi, 5-3-28 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Inventor Katsuhiro Yamachi 5-28, Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Zosen Corporation (72) Inventor Hidetoshi Hirata 5-3-8 Nishi-Kujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd.

Claims (4)

[Claims] 1. A dry raw material composed of defibrated waste paper or pulp is charged into a cylindrical mold having a core arranged on one end side in a volume which is a multiple of the volume of the molded body, and the compression mold is applied from the other end side. Is inserted and moved to one end side to compress the raw material between the mold and the core, and the core is retracted to a predetermined position in conjunction with the compression movement of the compression mold to perform compression molding into a predetermined shape. A method of compression molding a used paper or pulp cushioning material. 2. A cylindrical mold is provided with a receiving die having a through hole on one end side thereof, a core is retractably disposed in the through hole of the receiving mold, and compression driving is performed on the other end side of the form. A core retreating means for retracting the core by interlocking with the compression driving means, provided with a compression mold for projecting and moving the raw material into the mold by means to compress the raw material, and raw material supplying means for supplying the raw material into the mold A compression molding device for waste paper or pulp cushioning material. 3. A base core in which a take-out mold is removably provided in a compression molding portion on one end side of the mold, a compression mold is made removable in a compression driving means, and a core is connected to a core retracting means. And a take-out core which is detachably attached to the base core and is located in the take-out mold during compression molding, and covers the outer surface of the molded body during compression molding, the take-out mold, the compression mold, and the take-out core. 3. The compression molding apparatus for waste paper or pulp cushioning material according to claim 2, wherein and are slidable in a direction orthogonal to the raw material compression direction. 4. A positioning member that is retracted and retracted by a retracting means is provided in the base core, and a positioning recess into which the positioning member can be fitted is formed in the removal core. A device for compression molding of a waste paper or pulp cushion material as described.