JPH062500B2 - Method and apparatus for manufacturing resin container or lid having twisted ridges - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method and a manufacturing apparatus of a ridged container or a lid having a same lead angle in the same direction on the side surface of a resin sheet.

2. Description of the Related Art In recent years, in supermarkets, foods are subdivided and almost arranged in packs or cups on a shelf in a packaged state, and various products having different shapes are appearing one after another. However, although the containers vary in size, the shape is almost uniform, and there are few particularly eye-catching ones, and the result is that the ones put in an eye-catching container sell well.

Problems to be solved by the invention In view of this, the emergence of a container or lid with an eye-catching design is desired, and there is a problem that the unique eye-catching shape is difficult to manufacture or mass-produce. .

Means for Solving the Problems A resin-made container and a lid in which one or more convex portions having constant lead angles in the same direction are formed on a side surface. In addition, a large number of twisted protrusions having the same lead angle and the same lead angle are formed on the inner side surface of the cone, and a plurality of cavities which are arranged in a grid pattern so that they can be swung by opening a mold of a molded body having a draft in the same plane Each of the cavities has a window perforated and is located substantially on the same plane as the upper surface of the cavities, and the resin sheet material having the softening temperature is fed onto the entire surface of the knock plate that is movable in the axial direction of the cavities, and is vacuumed. Or, after the resin sheet material is brought into close contact with the cavities and the mold and the knock plate by pressure air and solidified, an impact force is exerted on the convex contact surface with the movement of the knock plate and twisted by the turning of all the cavities to form a molded product with ridges. The resin sheet material formed in multiple rows is removed from the cavitation at the same time.

In addition, a cooling table is provided which circulates a fluid to suppress the temperature rise on the mold side during cooling and is cooled, and a large number of them are provided on the same surface in a grid pattern so as to be swivelable on the cooling table. A resin sheet material in which a cavity of a molded body having a twisted convex inner cone with the same lead angle is machined, and a window in which a large number of the cavities face each other and the upper surface of which is substantially flush with the cavity. A knock plate that is movable to lift the knock plate, a driving means that lifts the knock plate, a means that controls the lifting speed by the driving means, and an impact application that loosens the fitting portion of the twisted ridge when the molded product is released. And a means for communicating with a supply source of air suction or pressure air jet for adhering the resin sheet material to the mold of the molded article, and a plurality of molded articles in a plurality of rows from one resin sheet material. It is intended to molding at a time.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. A box 11 fixedly mounted on a die mount 10 of a machine that can move up and down.
On the cooling table 12 fixed to, a large number of cavitating holes 12a are regularly formed at regular intervals like a go stone arranged on a grid. The cavitation 14, which is rotatably mounted in the mounting hole 12a via the needle roller or the sliding bearing 13, is made in conformity with the container a shown in FIG. A female die 14a is formed around a large number of ridges 14b having the same lead angle in the same direction. It goes without saying that the number of the ridges 14b and the lead angles are made in accordance with the design in which the leads are provided on the outer circumference of the container. A flange 14c is laterally projected on the outer peripheral portion of the cavitation 14, and an annular recess 14d is cut on the bottom back. A fluid pressure actuated rotary actuator 15 is fixed to the lower surface of the center of the mounting hole 12a of the cooling table 12, and its output shaft penetrates through the center of the mounting hole 12a of the cooling table 12 and is integrally connected to the cavitation 14. A spiral spring 16 is housed in an annular recess 14d on the bottom of the bottom of the cavity 14, and the spiral spring 16 has one end fixed to the cavity 14 side and the other end fixed to the cooling table 12 side. The spiral spring 16 is provided in the cavitation 1 in the direction to remove the molded body from the fitting of the ridge 14b.
A spring force for turning 4 is applied. The fluid pressure actuated rotary actuator is connected to a pressure source (not shown), and is supplied with pressure fluid so as to rotate the spiral spring 16 in a winding direction. Thrust bearings 17, which are held at equal intervals by retainers, are mounted on the upper surfaces of the flanges 14c of the cavities 14, and the upper surfaces of the cavities 14 are located on the upper surface of the flanges 14c at a height corresponding to the mouth line of the molded body. , Cavitation 1
Knock plate 1 having holes for allowing the respective mouths of 4 to fit together
8 is mounted. The knock plate 18 has its cavitation 1
4 are connected to knock pins 19 penetrating the cooling table 12 at several points, and each knock pin 19 is connected by a back plate 25, and is constantly pushed down by a spring 26 interposed between the back plate 25 and the cooling table 12. There is. Then, it is pushed up by a cylinder piston device of a knock device of a machine (not shown), and the pushing amount is regulated by the stopper 27. Then, the vertical pressure of the knock plate 18 is controlled by limiting the pressure fluid supplied to the cylinder of the mechanical knock device with the throttle. Further, the cooling table 12 is provided with water channels 12b vertically and horizontally so as to cool the cavities 14 from the side and bottom surfaces, so that cold water is constantly supplied and circulated during the work. When the formed body is vacuum formed or vacuum / compressed air formed, a large number of air suction holes 14e are formed on the circumference of the corner of the bottom of the cavity 14 so as to communicate with the annular recess 14d.
It is connected to the vacuum source from d through the suction passage 12c of the cooling table 12. When the molded body is pressure-formed or vacuum / pressure-formed, a nozzle (not shown) that uniformly ejects pressure air from the upper part of the female mold 14a on the circumference is provided so as to be movable to the ejection position and the retreat position, and further deeper. In forming the container, a pressing rod (not shown) similar to a conical hole is provided so as to be movable between an operating position and a retracted position, and pressurized air is ejected between the pressing rod and the female hole 14a.

Action The case of vacuum forming will be described. The cavitation 14 is a female mold 14 that corresponds to the shape of the container a shown in FIG. 7, for example.
The one a is attached and pressure fluid is sent to the rotary actuator 15 to rotate the cavity 14 to a predetermined angle position, and the spiral spring 16 is wound therein. Further, cold water is circulated in the water passage 12b of the cooling table 12 to cool the cavities 14. As the container material, rolls of heat-softening sheets such as styrene and vinyl chloride are prepared, and both widths are pulled out by a chain from a roll stand (not shown) and pulled out through a heating zone (not shown). Sent to the top. A flow path to a vacuum source (not shown) is opened to suck air in the female mold 14a and other spaces from the suction path 12c. A part of the sheet softened by this suction force is a female mold 1.
4a of the spiral wire on the side wall which is sucked into and stretched in 4a.
In addition to being closely adhered to the peaks and valleys of the same, it is also adhered to the knock plate 18. Since the cooling table 12 is cooled, when the sheet comes into close contact with the cavities, it is cooled to the curing temperature in a short time. After waiting for cooling, the hydraulic cylinder of the knock device of the machine is operated to lift the knock plate 18 through the back plate 25 and the knock pin 19 until it is stopped by the stopper 27, and the supply pressure of the rotary actuator 15 is instantaneously released. The cavitation 14 is swung by the stored force of the spring 16 and an impact force acts on the convex-shaped fitting surface of the spiral wire, and the knock plate 18 lifts the sheet to bring about a synergistic effect with the swirl component force of the spiral wire. It is peeled off and the fitting is loosened. When the mold mount 10 descends, the cavities 14 are swiveled, and when the radial gap reaches the height of the ridges of the ridges 14b, the molded body is completely separated. In this way, a large number of cavitations 14 arranged in the shape of a go of a board are all swiveled at the same time, and the sheet with the molded body is easily separated, and the sheet is ejected from the die by the lowering of the die mount and punched. Sent to the process.

In the case of this example, since the return positions of the cavities 14 can be made uniform by the rotary actuator 15, not only the container a of FIG. 7 but also an ellipse whose upper and lower surfaces are 90 ° different in major axis as shown in FIG. It is possible to mold and release various shapes such as a continuous container b, and a container c in which a square as shown in FIG. 9 is twisted by 45 °.

Second Embodiment Second Embodiment The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

A bevel gear-shaped positioning tooth 20 having chevron teeth is fixed to the upper surface of the flange 14c of the cavitation 14, and a bevel gear-shaped positioning tooth 21 having chevron teeth facing this is fixed to the lower surface of the knock plate 18. This bevel gear-shaped positioning tooth 2
It is also possible to substitute either one of 0 and 21 with a pin. And Yamagata is preferably triangular. Further, a mountain-shaped gear-shaped portion 14f is cut on the outer side surface of the cavitation 14, a pin 22 is supported on the cooling table 12 side so as to be capable of advancing and retreating toward the side surface of the cavitation 14, and is constantly urged by a spring 23 in the protruding direction. ing.

The position of this pin 22 is the position shown in FIG. 4 (b) where it engages with the slope near the top of the mountain when the positioning teeth 20, 21 are properly meshed as shown in FIG. 4 (a). The force in the direction in which the cavitation 14 is turned is received by the component force of the thrust output. The mountain shape of the gear-shaped portion 14f is preferably triangular, and the head of the pin 22 may be conical or spherical.

Further, a male screw is engraved at the lower end of the cavitation 14, and a nut 24 is screwed onto the male screw to prevent rotation. A thrust bearing 17 is interposed between the nut 24 and the lower surface of the annular groove 12d formed in the bottom of the cavity mounting hole 12a of the cooling table 12 via a race. Therefore, the cavitation 14 is prevented from moving in the axial direction by the cooling table by the flange 14c and the nut 24. Similarly, a plurality of these cavities 14 are arranged like a go stone on a board to form a multi-type.

Action The knock plate 18 is in the lowered position and the cavitation 14
Is pushed down and the positioning teeth 21 are pressed to 20,
The gear-shaped portion 14f on the side surface of the cavity is engaged with the pin 22 as shown in FIG.
Is in a state where the peaks are out of phase as shown in FIG. 3 (a), the positioning teeth 20, 2 are moved by the pressing force of the knock plate 18.
Forcibly correcting the deviation of the ridges of No. 1 and by the component force in the turning direction by the meshing of the teeth, the pin 22 is pushed against the axial force component of the pin axial direction of the gear-shaped portion 14f against the spring 23, and the pin 22 is pushed. The state shown in Fig. The positioning teeth 20 and 21 are in the state shown in FIG.
4 receives a turning force in the direction of the arrow due to the force of the spring 23.
After each cavitation 14 is held in this state, when the heated sheet covers the entire surface of the die, the air in the female die 14a and the space is sucked from the suction passages 12c, 14d, 4e connected to the vacuum source, and the sheet is sucked. The part is stretched and closely adhered to the ridges on the inner peripheral surface to be molded and cooled.

When the knock plate 18 is lifted to release the molded body, the pin 22 is pushed out by the force of the spring 23 as the engagement between the positioning teeth 20 and 21 is loosened and a gap is formed in the tooth, and the angle gear-like portion 14f is turned in the arrow direction. The impact is applied to the ridge fitting portion, and the seat is peeled off and the fitting is loosened due to the synergistic effect with the turning component force of the spiral due to the lifting of the knock plate 18. Cavitation 14 due to the lowering of the die mount 10.
The ridge of the gear-shaped portion 14f is pushed into the pin 22 and swung, the molded body is completely released, and the sheet with the molded body is removed from the mold. In this embodiment, when the gear teeth are not pivotally positioned at a fixed position by the positioning teeth, it is suitable for forming a container a having no directivity as shown in FIG.

Third Embodiment The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. This one lifts the knock plate 18 without providing any means for generating an impact force in order to loosen the fitting of the ridge. Alternatively, the knock plate 18 is fixed to the cooling table 12 by the knock pin 19 and integrally lowered the mold mounting table 10 of the machine together with the cavitation 14 and the cooling table 12. An impact force can be applied by adjusting the ascending / descending speed. When the cavitation 14 is lowered, the seat is held by the chain, so that the cavitation 14 is rotated along the spiral line to loosen the fitting of the ridge portion. Further, if necessary, at the time of demolding, 12c and 14e are provided from the suction holes or a dedicated flow path is provided so as to blow pressured air to help the peeling. In addition, when the knock plate 18 is lifted, a stopper may be provided to restrict the lifting of the cavities.

It should be noted that the embodiment has been described with reference to the vacuum forming, but it goes without saying that it can be applied to pressure forming or vacuum / pressure forming by using a push rod together with a deep container or the like.

Effect When the container and lid are molded, no impact is applied to the convex fitting part, and the cavitation is freely swiveled to release the fitting of the convex strip by the relative movement in the axial direction between the molded body and the mold to separate the mold. Therefore, it is possible to perform multi molding at the same time for a cup or the like having a twisted ridge in which multiple cavities are arranged in multiple rows. Even when there is unevenness in the fitting strength of the fitting portion at the time of releasing, the sheet material is released smoothly at the same time due to the impact, so that the sheet material is not wrinkled and the quality of the thin molded product is not deteriorated.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first cavitation of an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a cavitation of the second embodiment, and FIG. 3 (a) is FIG. 2 is a relationship diagram between the gear-shaped portion and the pin in a state where the molded product is released. (B) is a relationship diagram between both positioning teeth, and FIG. 4 (a) is a relationship between the gear-shaped portion and pin in the molded state. In the figure, (B) is a relational diagram of both positioning teeth, FIG. 5 is a vertical sectional view of one cavitate of the third embodiment, and FIG. 6 is a perspective view of a multi type in which a large number of cavitates are arranged.
FIG. 8 is a view of a container having a regular spiral line, FIG. 8 is a view of an elliptical twist container, and FIG. 9 is a view of a square twist container. 12 ... Cooling stand, 12b ... Cooling water passage 13, 17 ... Bearing, 14 ... Cavity 14a ... Mold, 14b ... Convex ridge 14e ... Suction passage 15 ... Rotary actuator 16 ... Spiral spring, 18 ... Knock plate 20, 21 ... Positioning tooth 14f ... Gear-shaped part, 22 ... Pin 23 ... Spring

Claims (2)

[Claims] 1. A large number of cavities in which a plurality of twisted ridges having the same lead angle in the same direction are formed on the inner side surface and a mold of a molded body having a draft is opened on the same surface so as to be rotatable and arranged in a grid pattern. And a resin sheet material having a softening temperature is fed onto the entire surface of a knock plate which is provided with a window facing each of the plurality of cavities and is located substantially flush with the upper surface of the cavities and movable in the axis direction of the cavities. After the resin sheet material is brought into close contact with the cavities and molds and the knock plate by vacuum or compressed air and solidified, an impact force is applied to the ridge contact surface with movement of the knock plate and twisted by the rotation of all cavities A method for producing a resin container or lid having twisted ridges, characterized in that a resin sheet material having a large number of molded articles formed in a plurality of rows is simultaneously released from the cavities and extracted. 2. A cooling table for cooling the temperature rise on the mold side during cooling by circulating a fluid and a cooling table, and a large number of them are provided on the same surface in a grid pattern so as to be rotatable on the cooling table. A cavitation in which a mold of a molded body having a twisted convex cone inner surface with the same lead angle in the same direction should be cut,
A plurality of knock plates having windows facing each of the cavities, the upper surface of which is substantially flush with the cavities and which is movable to lift the resin sheet material, drive means for lifting the knock plates, and the drive means. Means for controlling the lifting speed, impact imparting means for loosening the fitting portion of the twisted ridge when the molded body is released, and air suction or pressure air jetting for closely contacting the resin sheet material with the mold of the molded body An apparatus for manufacturing a resin container or lid having twisted ridges, comprising a means for communicating with a source, and molding a plurality of multi-row molded bodies at once from a single resin sheet material.