KR830001235B1 - Apparatus for the manufacturing of foamed plastic products - Google Patents

Abstract

In a foam extrusion appts. with a vacuum chamber(10) & a die(42), the die has adjustable top & bottom lips controlling the configuration of an orifice(133). The orifice is controlled by adjustment screws(134) for each lip which is rotated through universal joints(135) driven by rods(137) extending through a boss(137) secured by welding. In this manner the lips of the die(42) may be adjusted externally of the vacuum chamber & the closure during operation of the extrusion line.

Description

Foam extrusion regulator

1 is a plan view of the lower end cut away showing the upper end of an air pressure angle, which is a vacuum chamber, and a partition wall of the extruder and the air pressure angle arranged in a line.

FIG. 2 is a partially enlarged vertical sectional view taken from line 2-2 of FIG. 1 and penetrating the upper end of the barometric angle and the partition wall.

3 is a vertical cross-sectional view taken along line 3-3 of FIG. 2 showing the front face of the partition wall.

4 is a partially enlarged view of a partition wall facing the upper end of an air pressure angle (vacuum room).

FIG. 5 is a vertical cross-sectional view taken along line 5-5 of FIG. 2 showing the clamp between the extruder and the tube.

6 is a partially cutaway view of the tube between the extruder and the die.

7 is a schematic representation of a drive system for causing an extruder and a partition to reciprocate in a vacuum chamber.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam extrusion control device, and more particularly, to a foam extrusion control device combining a vacuum chamber and a partition wall which is integrally reciprocated from a vacuum chamber with an extruder on one side and a die on the other side.

It is already known that the presence of a vacuum chamber can facilitate the formation of billet or plank shaped extruded foam and the foam can expand under pressure below atmospheric pressure.

Vacuum foam extrusion apparatus and methods can be found in Nelson-owned US Pat. No. 3,584,108, maxon-owned US Pat.

The most difficult problem in the vacuum extrusion technique is to vortex and pull out fine and weak foam from the vacuum chamber.

This problem was solved by using the inclined barometric angles found in U.S. Patent Nos. 3,704,083 and 4,044,084 by the inventor's prior application. In large equipment, one or several in-line large extruders connected to the die in the vacuum chamber are used.

In addition to dies that are relatively large and heavy, devices such as forming devices and conveyors are also used in vacuum chambers.

Although the manufacturing process is continuous, it needs to go inside periodically for cleaning, maintenance and parts replacement.

According to the present invention, there is an elongated vacuum chamber having an end wall perpendicular to the axial direction. A bulkhead that blocks the end wall supports the die for the extrusion line therein.

The extruder is connected to the die through a septum by a tube with a heat exchange reflux jacket.

The partition wall is maintained in a plane parallel to the end wall of the vacuum chamber and is installed to reciprocate from the vacuum chamber. As the partition wall reciprocates from the vacuum chamber, the vacuum chamber is opened and closed.

The bulkhead and the extruder are mounted on a horizontal rail so as to move integrally or independently. In this way, the vacuum chamber may be easily entered and the vacuum chamber may be easily opened and closed.

The adjustable die can also be adjusted outside of the bulkhead.

Accordingly, an object of the present invention is to control the shape and size and amount of the extrudate by controlling the size and shape of the die hole outside the vacuum chamber when the vacuum chamber is closed by the partition wall.

The present invention will be described in detail with reference to the accompanying drawings.

The die 42 has an adjustable top lip and bottom lip to adjust the shape of the hole 133.

The hole 133 is controlled by several adjustment screws 34 on each lip and the adjustment screw 134 is operated by a rod 136 extending through the partition 40 in the form shown in FIG. It is rotated through a universal joint 135.

Since the upper and lower ribs have three adjustment screws, each of the ribs has three rods 136 extending through the partition 40, respectively.

Each rod 136 extends through a boss 137 welded to the septum 40, with each boss 137 having one or more zero rings 138. The outer end 139 of each rod 136 has a square, so that it is easy to rotate. In this way, the lip of the die 42 can be steered outside the vacuum chamber 10 and the partition 40 even during operation of the extrusion apparatus.

More or fewer adjusters may be installed than shown, with more or less external drives installed.

When the vacuum chamber 10 is closed, the hole 133 of the die 42 is in proper line with the long vacuum chamber (atmospheric pressure angle) 10 so that the extrudate exiting the hole 133 is the belt shown in FIG. It will pass properly between the conveyor 142 and the belt conveyor 143.

When the embodiment of the present invention according to the accompanying drawings in detail as follows.

FIG. 1 shows a pressure chamber 10 and a series of extrusion apparatuses 12, which are vacuum chambers, in which the extrusion apparatus 12 is contained in the structure 13, and the pressure angle 10 is not shown, but the water tank ( It is supported by the inclined platform 14 which extended downward at a small angle to water. Sidewalks 15 leading to the lower structure containing the working apparatus of the extrudate of the tank are provided on both sides of the vacuum chamber 10.

The barometric angle 10 is quite long so that the structure 13 is actually at a significantly higher position than the water tank in which the bottom of the vacuum chamber 10 extends.

The structure 13 at the top of the vacuum chamber 10 has a horizontal bottom slab 20 to which the in-line extrusion device 12 is supported.

The illustrated extruder 12 has a slightly smaller mixer extruder 21 to feed the extrudate to a larger chilled extruder 22.

The discharge of the mixed extruder 21 is supplied to the cooling extruder 22 laterally by the conventional method in a series of extrusion apparatuses, as shown by (23). The mixing extruder 21 and the cooling extruder 22 are respectively installed on the rail 25 and the rail 26 to reciprocate from the vacuum chamber 10.

Raw materials, such as virgin or regenerated styrene particles and other ingredients, are fed from the storage silos 28 and 29 to the hoppers 27 of the extruder 23 through flexible tubes 30 and 31, respectively.

A blowing agent is supplied from the feeder 33 to the mixing extruder 21 through the flexible pipe 34.

Instead of the illustrated single row extrusion device 12, a single or single row extrusion device having one or more static mixers, such as a command generator, may be used.

The outlet end of the cold extruder 22 is connected by means of a clamp 36 to a connecting tube 37 that extends through the partition 40 of the vacuum chamber 10 to the extrusion die 42 as shown in FIG.

The vacuum chamber 10 is generally a plurality of tubes 45 and 46 connected to each other at the end and end of FIG. 1 to be elongated tubes having a diameter of 1.25-2 meters.

Some of the multiple tubes 45 and 46 connected are attached by large U-shaped bands 47 and 48 attached to both sides of the tube, as shown at 50.

It is preferable to fix in this way because of the axial force generated in the partition 40 when the vacuum chamber 10 becomes a vacuum.

The vacuum chamber 10 is vacuumed by a suitable vacuum pump 52. The negative pressure in the vacuum chamber 10 is well controlled by opening a bleed valve 53 to allow air to enter the vacuum chamber 10.

The barometric angle 10 extending axially is inclined at about 5-25 ° so that the top surface 55 of the barometric angle 10 is inclined at 65-85 ° and is of course perpendicular to the inclination axis of the vacuum chamber 10.

The upper face 55 has a flange bearing ring 57 with a radial flange 58, which is in close contact with the upper face 55, and the axial flange 59 has a vacuum chamber 10. Is fitted in the inner diameter of the top. The flange bearing ring 57 is hermetically fixed in place by a suitable ash product shown at 60 in FIG.

The radial flange 58 is fitted with an appropriate air barrier 62.

The air block 62 is simply attached to the face of the flange 58 in the form of a compressible foam resilient tape.

The partition 40 is a relatively large weldment in which the round plate 65 is welded to the annular ring 64. On the outside of the round plate 65, four pairs of projections 67, 68, 69, 70 shown in FIG. 3 are welded. These protrusions 67, 68, 69, 70 are for supporting the partition wall 40 to the carriage 72.

The carriage 72 consists of two terminations 73, 74 connected to each other by two transverses 75, 76. The transverses 76 are two types when the bulkhead 40 is in a position blocking the vacuum chamber 10 as shown in FIGS. 1 and 2 at about halfway point between the two end 73 and 74. End stages 73 and 74 are placed on the upper end of the vacuum chamber 10. The carriage 72 is supported on two parallel rails 78 and 79 by the roller 80 to perform the axial movement of the vacuum chamber 10.

The rails 78 and 79 are parallel to the rails 25 and 26 supporting the extruders 21 and 22, have an inverted shape of the V, and the rollers 80 have V-grooves.

The transverses 76, better shown in FIG. 3, have borckets 82, 83 with protruding supports 84, 85, respectively, so that the partitions 40 are supported by pins 86, 87. It is supported by the protrusions 69 and 70 that are outside the bottom, respectively.

The cross section 75 also has a bracket 89 having a pair of supports 90 to which the braces 91 and 92 are connected by a pin 93.

The upper ends of the braces 91 and 92 are connected to a pair of protrusions 67 and 68 on the outside of the partition 40 by pins 94 and 95.

The braces 91 and 92 have elongated holes through which the pins 94 and 95 enter so that they can be adjusted by the adjustment pin 96 so that the partition 40 is closed at the end wall 55 of the vacuum chamber 10. It can be adjusted to be supported at a desired slope parallel to.

As shown in FIG. 3, three cylindrical extensions 98, 99, 100 are welded to the partition 40, the end walls of which are closed by plates 101, 102, 103, respectively. have.

The plate 101 and the plate 102 are transparent so that the inside of the partition 40 can be seen as a porthole.

The plate 103 is an air blocking connection point or a passage plate to enable the supply or association of power through the partition wall 40 so that the lighting power source, the thermoelectric pair or the heat exchange medium for the die, etc. Allow it to pass

In the central portion of the partition 40 there is another cylindrical extension 105 through which the connecting pipe 37 is connected and extended in a sealed state with respect to the partition 40.

The connecting tube 37 is connected to the extruder 22 via the clamp 36 and has a device 106 having a beveled flange tube 107 interacting with the device at the outlet of the extruder 22. It contains.

As shown in FIG. 5, the fastening frame 36 has two semicircular arc fastening frame parts 108 and 109 so that the two fastening flange bolts 110 and 111 on both sides are tightened so that the two bevel flange tubes are connected to each other. It is hermetically connected.

The upper fastener portion 108 is supported by a screw 112 which is operated by a hand wheel 113 extending through a blacket 114 at the discharge end of the extruder 22 and up and down vertically. You can exercise.

In this way, the fastening frame part 108 and the fastening frame part 109 can be vertically separated without being completely disassembled.

As shown in FIG. 2 and FIG. 6, the connecting pipe 37 has an elbow 116 and the discharge end has a thread 117 to be hermetically connected to the plate 118. The outer shape of the plate 118 is circular, it is attached to the flange end of the stainless steel corrugated cylinder 120 by the ring clamp 121.

Another flange end of the corrugated container 120 is attached to the cylinder 105 by the loop fastening frame 122.

The end of the connector tube 37 beyond the plate 118 is attached to the packing tube 123, which is part of the die 42.

The illustrated corrugation tube 120 not only allows the connector 37 through the partition 40 to be vacuum sealed, but also allows the connector 37 to have a relatively limited axial movement and slight lateral direction of the partition 40. Allow you to exercise.

In the connecting pipe 37 between the extruder 22 and the die 42 or the connecting plate 118 is an insulating jacket 125 shown in FIG.

The jacket 125 is spaced from the outside of the connector 37 by a spiral wire 127.

Spiral wire 127 allows the jacket 125 to be evenly spaced from the connector 37 as well as provide a spiral passage.

Both ends 128 and 129 of the spiral wire 127 are welded to the connector 37 to close both ends of the jacket 125.

It is not necessary to weld the spiral wire 127 over the entire length of the connection pipe 37 or the jacket 125, and it is good to weld as needed.

The jacket 125 has an inlet connection elbow 130 and an outlet connection elbow 131.

By circulating a heat exchange medium such as hot oil or water through the jacket 125, the extrudate in the conduit 37 maintains the desired temperature as the extrudate passes from the extruder 22 to the die 42.

According to U.S. Patent No. 4,044,084 by the inventor's prior application, the upper conveyor 142 extends over the entire length of the vacuum chamber 10 and leads to the water tank at the bottom. The extruder 21, 22, the partition 40, and the die 42 connected thereto are moved by means of the relatively simple device shown, for example, in FIG. 7.

Both ends 146 and 147 of the drive chain 145 are fixed to the floor.

The drive chain 145 lifts two moving gears 148 and 149 and the driving gear 150 by the output of the gear motor 151.

The gearmotor 151 and the two moving cogwheels 148 and 149 hang on a bridge plate 152 extending between the two extruders 21 and 22.

By using the drive motor in this way, not only the partition 40 and the die 42 connected thereto, but also the two extruders 21 and 22 can reciprocate from the end of the vacuum chamber 10.

Atmospheric pressure is very sufficient to hold the extruders 21, 22 and the partition 40 in the position shown in FIG. 2, so that the partition 40 has no clamps or fixtures for coupling it to the vacuum chamber 10.

The partition 40 and the extruder 21, 22 of course cannot be separated from the vacuum chamber 10 until the negative pressure in the vacuum chamber 10 actually returns to atmospheric pressure.

When the partition 40 is separated from the extruders 21 and 22, the vacuum chamber 10 does not become a vacuum so that the partition 40 can reciprocate from the vacuum chamber 10 manually or by a simple pulley or by a winch device. Can be.

As the foam extrusion apparatus, the partition wall 40 for the vacuum chamber 10 is coupled to the extruders 21 and 22 to move in and out of the vacuum chamber 10 to move in and out of the vacuum chamber 10 so as to easily enter and exit the vacuum chamber 10. It can be seen that vacuum extrusion clothing and methods are provided.

Claims (1)

The extruder 21, 22 and the partition 40 are integrally interlocked on the rails 25, 26, 78, and 79 to open and close the vacuum chamber 10 and the extrudate through the die 42. 10) In the foam extrusion apparatus that is extruded and expanded in the inside, the externally extending rod 136 and the universal joint 135 are pushed into the boss 137 welded to the partition 40 in the upper and lower ribs. And a hole 133 of the die 42 to control the outside of the closed vacuum chamber 10 through the outer end of the rod 136 during operation of the extrusion line.

Images