JP2002128043A - Pressing device for pulp mold shaped body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressing device for a pulp mold shaped body where an attachment and a removal of a core cylinder are made easy, and an accurate positioning of the core cylinder is enabled. SOLUTION: In the pressing device for a pulp mold shaped body, a retractable pouched elastic core cylinder 2 is expanded within a hollowly molded body which was made by a pulp mold method, and an inner surface of the molded body is pressed. The pressing device is equipped with a holding tool 3 which tightly holds an opening 20 of the elastic core cylinder 2 and preserves the opening state, and the device's main body 4 which possesses a fixing part of the holding tool 3, and the device's main body 4 possesses, at the fixing part, a positioning means 5 for positioning the holding tool 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulp molded article pressing apparatus for pressing a molded article formed by a pulp molding method by expanding a core from the inside thereof.

[0002]

2. Description of the Related Art In manufacturing a hollow pulp molded article, an expandable and contractible bag-shaped elastic core is inserted into the molded article during dehydration and drying of the molded article. In some cases, a pressing device for a pulp molded product (hereinafter, simply referred to as a pressing device) for expanding the elastic core and pressing the inner surface of the molded product may be used. In a conventional pressing device, a flange portion is provided in an opening of the core, and the flange portion is directly pressed into a positioning ring fixed to a mounting portion of the device main body, and a ring-shaped ring is formed on the positioning ring. The holding plate is fitted and the flange portion is pressed by the holding plate. The holding plate is fixed to the apparatus main body with screws, and the flange portion of the core is held between the device main body and the holding plate to be fixed.

For this reason, when the core is attached horizontally to the apparatus main body, or when the core is attached to the apparatus main body from below, the work of attaching and detaching the core takes time. Further, it is difficult to finely adjust the positioning of the core, and accurate positioning cannot be performed.

Accordingly, an object of the present invention is to provide a pressing device for a pulp molded article which can easily attach and detach a core and accurately position the core.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a scalable bag-shaped elastic core is inserted into a hollow molded article formed by pulp molding, and the elastic core is expanded in the molded article. A pressing device for a pulp molded product that presses an inner surface of the molded product, comprising: a holder for holding an opening of the elastic core and holding the opening, and a mounting portion for the holder. An apparatus main body, and the apparatus main body achieves the above object by providing a pressing device for a pulp molded article having positioning means for positioning the holder at a mounting portion thereof. .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a pressing device for a pulp molded article of the present invention will be described based on preferred embodiments with reference to the drawings.

FIG. 1 shows an embodiment of the pressing device of the present invention. In the figure, reference numeral 1 indicates a pressing device. As shown in the drawing, a pressing device 1 inserts a bag-shaped elastic core 2 that can be expanded and contracted into a hollow molded body (not shown) formed by a pulp molding method, and the elastic core 2 in the molded body. 2 is a device that swells and presses the inner surface of the molded body, and includes a holder 3 for holding the opening 20 of the elastic core 2 and holding the opening state, and a mounting portion for the holder 3. And a positioning means 5 for positioning the holder 3 at the mounting portion thereof.
have.

The elastic core 2 may be made of, for example, urethane, fluorine-based rubber having excellent tensile strength, rebound resilience, and elasticity.
It is formed from a material such as silicone rubber or elastomer. In addition, these materials can also be formed by coating a stretchable cloth or the like with these materials. An opening 20 of the elastic core 2 is provided with a flange 21.
The bottom inner surface is provided with a protrusion 22 having a substantially square horizontal cross section that projects upward. The shape of the bulging portion 23 of the elastic core 2 can be appropriately set according to the inner surface shape of the molded body to be pressed, but the shape in the untwisted state is the inner surface shape of the mold as described later. It is preferable that the shape of the elastic core 2 is substantially the same as or larger than that, since the expansion ratio of the elastic core 2 can be reduced and its durability can be improved.

The holder 3 is provided with an opening 20 of the elastic core 2.
Are mainly composed of two holding members 30 and 31 for holding the holding member 3 at the flange portion 21 thereof.
0 and 31 are fixed by screws 32. The holding member 30 is a ring-shaped member that holds the flange portion 21 of the elastic core 2 from the upper surface side. The holding member 30 has a convex portion 30a inserted into the opening 20 of the elastic core 2 and a concave portion 30b with which the upper surface of the flange portion 21 contacts,
A hole 30c having a clearance through which a core pipe 60 described later can rotate is formed at the center of the lower surface of the projection 30a. The interior of the projection 30a is a space for accommodating a connecting portion between the core pipe 60 and a drive shaft 61 described later. On the outer peripheral surface of the holding member 30, there is formed an engagement groove having a V-shaped cross section with which a ball of a ball plunger 50 described later is engaged or a hole 30d whose diameter is reduced in the depth direction. The holding member 31 is a member that holds the flange portion 21 of the elastic core 2 from the lower surface side. Note that a cylindrical buffer member 33 is disposed between the holding member 31 and the elastic core 2, and the corner of the holding member 31 repeatedly contacts the bulging portion 23 of the elastic core 2. It is designed to reduce the wear and tear at the time.

A mounting portion for mounting the holder 3 provided in the apparatus main body 4 is provided with a positioning ring 40 substantially corresponding to the outer diameter of the holding member 30 fixed to a frame 41. A hole 42 is formed in the frame 41 so that a drive shaft 61 described later can be inserted and installed via a bearing (not shown). The device body 4 is
The frame 4 moves in the direction in which the elastic core 2 is inserted into and removed from the molded body.
1 is provided with a drive means (not shown) for moving the cylinder 1 in parallel, and a fluid supply / discharge means (not shown) such as a compressor or a suction pump which communicates with a fluid inlet / outlet path to be described later.

The positioning means 5 is provided with a plurality of ball plungers 50 for locking the holder 3 at the outer peripheral portion thereof to prevent detachment from the apparatus body 4 and for positioning the holder 3. The ball plunger 50 has a bottomed cylinder provided with a coil spring (not shown) and a ball disposed at the tip of the spring. A male screw is formed on the outer peripheral surface of the cylinder, and a wrench hole is formed on the bottom (rear). Then, when the ball is brought into contact with the object, the ball can be pressed against the object with a pressing force based on the elastic force of the spring by the threaded position of the cylinder. The positioning means 5 is configured with a positioning ring 40 fixed to a frame 41 of the apparatus main body 4.
A plurality of screw holes 40a penetrating from the outer peripheral surface to the inner peripheral surface thereof are formed in the positioning ring 40 at equal intervals and radially. The ball plungers 50 are screwed into these screw holes 40a, respectively. Have been. Then, by inserting a wrench into the wrench hole and finely adjusting the screwing positions of these ball plungers 50 as appropriate,
The holding member 30 is moved in a horizontal plane in the drawing, and the holder 3 can be positioned with respect to the apparatus main body 4 with high accuracy.

The pressing device 1 is provided with a twisting means 6 for twisting the elastic core 2 by interlocking the elastic core 2. The twisting means 6 includes a hollow core pipe 6 inserted in the elastic core 2.
0, a drive shaft 61 for rotating the core pipe 60 forward and reverse around its axis, and a drive means (not shown) for transmitting a drive force to the drive shaft 61. The cross section of the core pipe 60 is formed in a substantially square shape, and the protruding portion 22 of the elastic core 2 is inserted into the lower end of the core pipe 60. The core pipe 60 is formed with a large number of holes 60a through which a fluid described later flows in and out. The inside of the drive shaft 61 is formed hollow, and a shield packing 61a, which is in contact with the inner surface of the convex portion 30a and prevents leakage of a fluid described later, is provided on the outer periphery of the lower end portion. The drive shaft 61 is inserted into the hole 42 of the frame 41 via a bearing (not shown). When a driving force is transmitted to the driving shaft 61 by the driving means, the driving shaft 61 and the core pipe 60 rotate together. The bulging portion of the elastic core 2 also rotates in conjunction with these rotations. However, since the flange portion 21 of the elastic core 2 is fixed by the holding members 30 and 31, a predetermined rotation angle is set. When rotated as described above, the elastic core 2 is gradually twisted around the core pipe 60. Since the bulging portion 23 of the elastic core 2 is twisted around the core pipe 60 in this manner, the horizontal cross-sectional shape of the elastic core 2 can be reduced, and the molded body has a narrow neck and neck. Even when the elastic core 2 is in or out, the elastic core 2 can be moved in and out without touching the inner surface of the mouth and neck portion, and can be operated at high speed.

The inside of the core pipe 60, the hole 60a, and the inside of the drive shaft 61 form a fluid path for taking fluid in and out of the elastic core 2, and this fluid path is connected to the main body 4 of the apparatus. It is connected to the provided fluid supply / discharge means. As described above, a large number of holes 60a are formed in the core pipe 60, and the inside of the elastic core 2 can be uniformly pressurized and depressurized through these holes 60a. In particular, when the inside of the elastic core 2 is decompressed, even if one hole is closed, it can be discharged from another hole, so that the swollen portion 23 can be smoothly twisted and the twisted state is further reduced. be able to. Compressed air (heated air), oil (heated oil), and other various liquids are used as the fluid used to expand the elastic core 2. The supply pressure of the fluid is 0.01 to 5 MPa, especially 0.1 to 5 MPa.
Preferably, the pressure is 3 MPa.

When the elastic core 2 is attached to the main body 4 of the pressing device 1, the holding member 30 is placed with its convex portion 30a facing upward, and the elastic core 2 is mounted on the convex portion 30a. Of the opening 20 of FIG. Then, the buffer member 33 and the holding member 31 are attached, and the flange portion 21 of the elastic core 2 is sandwiched between the holding members 30 and 31 by being tightly fastened with the screw 32. Then, the core member 60 is passed through the hole 30c of the convex portion 30a of the holding member 30, and the holding member 30 is positioned on the positioning ring 4.
Fit inside 0. At this time, it is preferable that the tip of the ball of the ball plunger 50 is slightly projected from the inner peripheral surface of the positioning ring 4 in advance. In the initial stage of fitting of the holding member 30, the ball of the ball plunger 50 is pressed against the outer peripheral surface of the holding member 30 and retreats, and the groove or hole 30 is formed.
When d reaches the depth of the ball, the ball returns by the elastic force of the spring, engages with the groove or hole 30d, and the holding member 31 is temporarily fixed to the frame 41 of the apparatus main body 4. By performing the temporary fixing in this manner, even when the elastic core 2 is attached to the device main body 4 from below as shown in FIG. Work can be performed easily. Then, after performing the temporary fixing, by finely adjusting the screwing position of the ball plunger 50, the holding member 30 is moved in a horizontal plane,
The holder 3 is accurately positioned and fixed to the apparatus main body 4. When the elastic core 2 is removed from the apparatus main body 4, the ball of the ball plunger 50 is pressed against the outer peripheral surface of the holding member 30 and retreats, whereby the holding member 30 is removed from the apparatus main body 4. Thereafter, the elastic core 2 is removed from the holding member 30.

As described above, in the pressing device 1, the elastic core 2 is previously held in the opened state by the holder 3, and the holder 3 can be mounted on the apparatus main body 4. Therefore, the mounting direction of the elastic core 2 Irrespective of this, attachment and detachment can be easily performed. Further, since the ball plunger 5 is provided on the positioning ring 50 of the mounting portion, the positioning can be performed more accurately and easily after the elastic core 2 is mounted on the apparatus main body 4. Further, once the positioning is performed, the positioning can be easily reproduced in the next mounting. Further, by preparing a plurality of spare elastic cores and holders and attaching the elastic cores to the holders in advance, attachment and detachment can be performed more smoothly.

The apparatus for pressing a pulp molded article of the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the spirit of the present invention. The pressing device for a pulp molded article of the present invention holds the opening 20 of the elastic core 2 with the holder 3 as in the pressing device 1 of the above-described embodiment, and attaches the lower end of the core pipe 60 to the elastic core 2. It is preferable that the elastic core 2 can be twisted around the core pipe 60 by inserting and fixing the projection 22. For example, when the inside of the elastic core 2 is suctioned under reduced pressure, the suction force is used. Thus, the bottom of the elastic core 2 may be sucked and fixed at the lower end of the core pipe 60 so that the elastic core can be twisted around the core pipe 60.

The apparatus for pressing a pulp molded article of the present invention can be used for both dehydration and drying of a molded article (pulp laminate) formed by a pulp molding method. In addition, the pressing device for a pulp molded article of the present invention can be particularly effectively used for a bottle-shaped molded article having a narrow mouth and neck as described above. By changing, it is needless to say that the present invention can be used for a box-shaped carton-shaped formed body having a wide opening, another shaped body such as an ornament.

[0018]

According to the present invention, the core can be easily attached and detached, and the core can be accurately positioned.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of an essential part showing an embodiment of a pressing device for a pulp molded article of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressing apparatus of pulp molded body 2 Elastic core 3 Holder 4 Device main body 5 Positioning means

Claims (3)

[Claims] 1. An expandable and contractible bag-shaped elastic core is inserted into a hollow molded body formed by a pulp molding method, and the elastic core is expanded in the molded body to press the inner surface of the molded body. A pressing device for a pulp molded article, comprising: a holder for holding an opening of the elastic core and holding the opening, and an apparatus main body including a mounting portion for the holder. A device for pressing a pulp molded product, the device body having positioning means for positioning the holder at a mounting portion thereof. 2. The positioning means includes a plurality of ball plungers for locking the holder at an outer peripheral portion thereof to prevent detachment from the apparatus main body and positioning the holder. Pressing device for pulp molded articles. 3. The pulp molded article pressing device according to claim 1, further comprising a twisting means for twisting the elastic core by interlocking the elastic core.