MXPA96004642A - Best multiple assembly - Google Patents

Abstract

The present invention relates to an improved manifold assembly for use with a die for plastic extrusion, the assembly comprising a water inlet tube, a tube through which a vacuum is pulled, a first section of the finger Calibration having an outer surface, the first section has: 1) at least one water receiver channel connected to the water inlet pipe, 2) a channel connected to the pipe through which a vacuum is pulled, and 3) the water pipe. water return placed centrally of the outer surface of the first section, the first section has formed in the same opening connected the channel connected the tube through which a vacuum is pulled, and a second section of the calibration die having a surface exterior and an inner channel, the second section has the water return pipe positioned centrally of the outer surface of the second section and the second section has openings formed therein. to connected to the interi channel

Description

IMPROVED MULTIPLE ASSEMBLY BACKGROUND OF THE INVENTION The invention relates, in general terms, to a manifold assembly for use with a die head for the extrusion of a plastic, and more particularly to an improved structure capable of forming a tube wall with openings therein. same when the tube is examined in cross section. A variety of uses have been found for plastic pipes especially related to drainage. One of the problems in the manufacture of plastic tubes is the amount of raw materials consumed and the weight resulting from the finished product. For example, a solid-walled plastic pipe with an inner diameter of 48 inches (121.92 centimeters) weighs approximately 200 pounds per foot. It was recently discovered that the plastic tube having openings formed therein, when the tube is viewed in cross section, weighs approximately 30 pounds (13,788 kilograms) per linear foot (.3048 meters). However, there is a problem in designing a machine capable of manufacturing tubes having the desired cross section. In general, the extruded plastic tube is formed on a production line that has a variety of specific machines incorporated into the manufacturing process.

One of the first machines is an extruder. Plastic powder, or more preferably granules, is fed through the extruder, where it is subjected to high temperature so that the plastic melts. The plasticized plastic then proceeds through a feed tube, at the end of which the plastic enters a die typically in the form of a drum. In front of the die is the profile in specific cross section that is going to be extruded. As the hot plastic exits the die, it passes over what is called calibration or calibration fingers that help maintain the desired cross-sectional shape that has been extruded. These calibration fingers are part of a manifold set. The remainder of the manifold set extends from above the die as well as beyond the calibration fingers. In addition to the extruder and the die, which is supported on a die post assembly, the plastic tube is manufactured using a forming head or former. Prior art manifolds sets are apparently limited in their ability to manufacture a plastic product having a cross section that incorporates openings. Thus it is apparent that there is a need for a manifold set that makes a product having the desired cross section.

SUMMARY OF THE INVENTION The problems associated with the calibration fingers of the above manifold are overcome according to the present invention by the presence of an improved manifold assembly which can be used together with a die head for the extrusion of a plastic with a manifold assembly comprising a water inlet tube, a tube through which a vacuum is pulled, a water return tube, a first section of the calibration finger, and a second section of the calibration finger. The first section of the calibration finger has an outer surface, and: 1) at least one water receiver channel connected to the water inlet pipe; 2) a channel connected to the tube through which a vessel is pulled; and 3) the water return pipe positioned centrally of the outer surface of the first section. The first section also forms in the same openings connected to the channel connected to the tube through which a vacuum is pulled. The second section of the calibration finger also has an outer surface and an inner channel. The second section has the water return pipe positioned centrally of the outer surface of the second section. The second section also has openings formed therein connected to the inner channel. The outer surface of the first section has formed therein at least one groove. Preferably the • Groove is a spiral groove. More preferably there is also formed a second radial groove. The radial groove intersects at least one, preferably both radial grooves. 5 The water return pipe has a first component and a second component secured to one another. The first component ends within the second section, and the second component extends beyond the second ^? section. In one embodiment of the invention the second component is curved. Preferably the second component is flexible. Also shown is an improved manifold assembly for use with a die for the extrusion of a plastic, said assembly comprising a water inlet tube, a tube through which a vacuum is pulled, a water return tube, a first section of the calibration finger having at least one groove formed therein, and a second one * section of the calibration finger. The outer surface of the first section of Preferably, it has a spiral groove formed therein and at least two radial grooves, with the spiral groove intersecting at least the two radial grooves. The first section also has formed in the same openings connected to the channel connected to the tube through which pulls a vacuum. The openings in the first section are located in the radial groove. The water return pipe has a first component and a second component secured to one another. The first component ends within the second section, while the second component extends beyond the second section. Preferably the second component is flexible. The second section of the calibration finger has an outer surface and an inner channel. The second section I0 has the water return pipe positioned centrally of the outer surface of the second section. The second section has formed in the same openings connected to the inner channel. The openings in the first section have a first diameter and the openings in the second section have a second diameter, the second diameter being greater than the first diameter. xti An improved manifold assembly for use with a die for plastic extrusion is also described, the assembly comprising a plurality of assemblies tubular, each tubular assembly comprising a water inlet tube, a tube through which a vacuum is pulled, a water return tube, a first section of the calibration finger having an outer surface, and a second section of the calibration finger The first section of the calibration finger has an outer surface - ^, and 1) at least one water receiving channel connected to the water inlet pipe; 2) a channel connected to the tube through which a vacuum is pulled; and 3) the water return pipe positioned centrally of the outer surface 5 of the first section. The first section also forms in the same openings connected to the channel connected to the tube through which a vacuum is pulled. The second section of the calibration finger also has an outer surface and an inner channel. The second section has the water return pipe positioned centrally of the outer surface of the second section. The second section also has openings formed therein connected to the inner channel. The outer surface of the first section has formed in it at least one groove. Preferably the groove is a spiral groove. More preferably there is also formed a second radial groove. The radial groove intersects • at least one of preference both radial grooves. The water return tube has a first component and a second component secured to one another. The first component ends within the second section, and the second component extends beyond the second section. In one embodiment of the invention, the second component is curved. Preferably the second component is flexible.

The main objective of the present invention is to provide an improved multiple gaging finger that can manufacture tubes having a plurality of openings formed therein when the tube wall is seen in cross section. Other objects and advantages of the invention will become apparent from the following description, the accompanying drawings and the appended claims. t Brief Description of the Drawings FIGURE 1 is a side view of a die and a die post assembly with a manifold assembly formed in accordance with the present invention secured thereto in an operative position. FIGURE 2 is a front elevated view of a die and a die post assembly in which the die will extrude the wall of a plastic tube having openings formed in ^ É | the same, specifically 8 small openings, generally in triangular form as well as 3 larger openings generally circular. FIGURE 3 is a side elevational view of the first section of the calibration finger of the improved manifold assembly of this invention. FIGURE 4 is a side elevational view of the intermediate tube which in the preferred embodiment of the invention is formed and then inserted into the first section of the calibration finger shown in FIGURE 3. FIGURE 5 is a vertical sectional view taken on a very enlarged scale along line 5-5 of FIGURE 3. FIG. However, that particular view shows the first section of the calibration finger as reinforced by it showing both the outer cover and the presence of the intermediate tube. FIGURE 5A is a vertical sectional view taken on a very enlarged scale and similar to FIGURE 5. However, this particular view shows a first section of the most extreme calibration finger as it is assembled. FIGURE 5B is a vertical sectional view taken on a very enlarged scale and similar to FIGURES 5 and 5A, however, this particular view shows the other first section of the most extreme calibration finger as - ^ h assembles. FIGURE 6 is a perspective view on a very enlarged scale taken from the top of the die 20 of FIGURE 1. FIGURE 7 is a vertical cross-sectional view on an enlarged scale taken along the line 7-7 of FIGURE 2. FIGURE 8 is a vertical cross-sectional view on a greatly enlarged scale taken along line 8-8 of FIGURE 1. Detailed Description of the Invention Referring to the drawings attention is directed first to FIGURE 1, which shows the improved multiple set associated with this present invention generally represented by the numeral 10. The multiple set extends along the die 15. The drum shaped die 15 is supported on a die post set # 20. The die and the die post are of the type found in the manufacture of plastic extrusion. The preferred embodiment of this invention uses a side feed spiral feeding die, although it can use a side feed spider die. Similarly, the calibration fingers of the improved manifold 16 are located where the calibration fingers of the prior art were located, that is, at the end of the die from which the plastic is extruded. This spatial relationship can be better appreciated from the consideration of FIGURE 2 that describes the presence of a die head 17. Die heads are well known in the conventional extrusion technique. However, this particular die head represents the presence of 8 small triangular sections and 3 larger circular sections that will allow the wall of the extrusion tube to have a plurality of openings formed therein. Extending along the die and the head of the die 17 is a portion of the multiple set of the die 10 to which this invention is physically secured. The portion of the manifold assembly of the die 10 is shown at the left end of the head of the die 17 and extends some distance from the die in the form of a drum., as will be described later. At the right end of the die head 17 is the calibration finger 16 associated with the manifold 10 of this present invention shown in its complete assembly, as can be seen from a comparison with FIG. 1. The finger of calibration 16 associated with this invention is formed by having a first section 25 and a second section 26. The first section or tubular member 25 is shown itself secured to the portion of the die manifold set 10 passing through die 15 in the average porsión of the saber of the die 17 in FIGURE 2. The first tubular member 25 is formed in the preferred embodiment of the invention having an outer sub-bit 27. As can best be grasped from a comparison of FIGURES 2 with the FIGURES 3, 5 and 7, the outer cover 27 has a first end as well as a second end, 28, 29, respectively. Additionally, the outer cover 27 is formed having an outer surface 30 with its outer surface having therein formed a first radial groove 33. Formed in the first radial groove there are a plurality of openings in the first section 35.

In addition, in the preferred embodiment of the invention, a second radial groove 37 is formed having a plurality of apertures of the second session 39 formed therein. 5 The preferensia tubular outer sub-piece is formed by having a first finger end 40, a finger cover 42, and a second end of finger 44. These three pieces are components of the outer tubular cover and are secured together by the respective connecting rings of the brass 48. Each connecting ring 48 is simply a ring with a threaded outer surface that engages a portion of the inner surface of the finger cover 42.

A threaded portion of the inner surface of the first finger end 40 is also fitted are the connecting ring 48, being that first inner surface of the finger end 52. A threaded portion of the inner surface of the second finger end 44 is also fitted with the connecting ring • 48, the second inner surface of the end of the finger 53. It can be seen in FIGURE 3 that the first end of the finger is tapering toward the die. This allows for an easier initial flow of the hot plastic over the calibration finger 16 as the plastic leaves the die head 17. In addition to the first radial groove 33 and the second radial groove 37 the surface 30 of the outer tubular cover 27 also preferably it has formed therein a • spiral groove 55. It should also be noted that the spiral groove is in intersession both the first radial groove and the second radial groove in the preferred embodiment of the invention. It will also be appreciated from the comparison between FIGS. 3 and 5 that the outer cover of the first section 23 of the most sentral tube set is preferably formed having two relatively flat surface portions 60 and two portions of curved surfaces. 62. while that the two outer tube assemblies have a flat surface only with respect to their inner side wall as can be seen in FIGS. 5A and 5B, respectively. An intermediate tube 64 shown in FIGURE 4 also has a first end 65 and a second end 66, and an inner surface 68 as can be seen from ljfi FIGURE 5 as well as the outer surface 69 as can be seen from both FIGURE 4 and 5. plurality of channels generally extending longitudinally 70 are formed on the outer surface 69 of the intermediate tube 64. In the preferred embodiment of the invention there are six of these sanitary water resepters 70. As mentioned above, FIGURE 5 shows a vertical cross-sectional view at a greatly enlarged scale. wherein the intermediate tube is colossal so as to be surrounded by the outer tubular cover 27. As such, the various water receiving channels 70 can be seen to be serrated so as to allow the passage of water in a first direction to through the die and into the second section. Additionally, the presence of the cold water in the six sanalts helps to cool the outer tubular surface in the presence of the protruding plastic. As can also be seen in FIGURE 5, the first tubular member 25 also has a plurality of radially extending channels 72 that extend from the inner surface 68 of the intermediate tube 64 to the openings in either the radial groove 33 or 37 As will be mentioned later, the inner surfaces 64 of the intermediate tube 64 help define a channel through which a vacuum is pulled. In the present assembly of the first tubular member the tubular outer cover has the intermediate tube placed therein in the appropriate holes and punched through both the tubular outer cover and the intermediate tube. First, the outer tubular cover and the intermediate tube are welded with the inner surface of the outer cover being welded to the outer surface 69. Once the two components are stabilized and a 3/32"(.238 centimeters) hole is drilled In diameter, an outer 3/32"(.238 centimeter) diameter aluminum tube is a 1/16" (.158 centimeter) hole press fit inside • from the 3/32"hole (.238 centimeters) until it reaches the inner surface 68. This process is repeated until the desired number of channels exists, which in the preferred embodiment shown in FIGURE 5 is six. of the tubes can be filed and each respective radially extending channel 72 sealed in place with an appropriate sealant.Preferably the radial groove is colossal on the outer sub-surface after it has occurred * 10 the welding and drilling mentioned above, but before the insertion of the tubes forming the radially extending channel 72. The cover of the finger 42 is approximately 18"(45.72 centimeters) long in the preferred embodiment of the and has an outer diameter of approximately 2 1/2"(6.35 centimeters), preferably the first radial head is at 2.1 / 2" (6.35 sentimeters) from the junction of the first end of the finger and the subsoil of the first finger. finger. Meanwhile, the second radial groove is approximately 19/16" (3,968 sentimeters) of the junction of the second end of the finger and the finger sub-surface. The spiral surso has 3/32"(.238 sentimeters) of ansho and has a height of 1" 2.54 forward double sentimeters over the total 18"(45.72 sentimeters) .In addition, the various sanales that extend longitudinally 70 are formed having a radius of 5/16"(.79 centimeters) In addition, each of the grooves is formed by being 1/4" (.635 centimeters) from the high point of the radius. The intermediate tube is about 16 1/2"(41.91 centimeters) long and has an outer diameter that matches the inside diameter of the outer shell, preferably both the outer shell and the intermediate tube are made of aluminum. it can be seen when FIGS. 1, 2, 7, and 8 appear in the second tubular member 26, also preferably made of aluminum, comprising a first end 80 and a second end 82 as well as an inner surface 84 and an outer surface. 86. The longitudinal shape of the second tubular member 26 corresponds to the shape of the plastic product to be produced When, as here, the manufacturing system is designed to produce cirsular plastic tubes, the longitudinal shape of the second section 26 is curve As can be seen in the drawings, the second tubular member 26 also has a plurality of openings 88 formed therein are these openings extending 0 between the inner surface 84 and the outer surface 86 of the second tubular member 26. Thus it can be seen that the second end of the outer cover 27 of the first tubular member 25 is attached to the first end of the tubular member. curved member 80. It should also be appreciated that the first tubular member is of a first length and the second tubular member is of a second length with its second length being longer than the first length ft. For example, in the embodiment of the invention described herein, the second tubular member measures 42"(106.68 centimeters) in length, with the first 3" (7.62 5 centimeters) being straight. Specifically, it should also be appreciated that the openings of the diameter of the curved member are larger than the diameter of the openings of the first member, mainly because the openings of the curved member '3 ^ facilitate the flow of water through it while The openings of the first member are used to facilitate the pulling of a vacuum. The vacuum helps to stabilize the shape of the plastic sonforme this is extruded. The portion of the multiple set of dice 10 secured to the die 15 can be better appreciated from a FIGURE 6 and FIGURE 6. As can be seen from these figures of the drawing, the rear face of the die head 93 is secured thereto with a rear manifold 95 tube housing, preferably secured by means of four screws . In the factory present this accommodation of the rear manifold tube comprises three components 95a, 95b, and 95c, respectively. It will also be appreciated that the rings-096a, 97b and 96c, of the manifold tube housing are soldered adjacent to the tube housing component of the corresponding rear manifold. 25 A TEFLON 98 insulating tube contains the inside of the die on the back side of the die head 93 with a 99 ft low-pressure air inlet line. In addition, a water inlet line, with a tube for each finger Calibration of the manifold is ensured to the tube housing of the rear manifold 5. This water inlet line 100 allows cold water to be introduced into the manifold set. A rear vacuum tube 103 extends from the tube housing of the rear manifold 95 and is con ^ & a subsequent vacuum line 105. Once again, it will be appreciated that the number of subsequent vacuum tubes 103 and hence the number of subsequent vacuum lines 105 corresponds to the number of calibration fingers 16. A water expulsion tube 108 also extends from the tube housing of the rear manifold 95 being each tube of expulsion of water 108 connected to the first section of the water expelling outlet line 10. While the vacuum tube and the water expelling tube are preferably formed of metal, the • Rear vacuum line as well as the first section of the water expelling outlet line are of composition plastic. Each of the first sections of the water expelling outlet 110 is connected to a water ejector 112. It has been found that a good expeller package sold by Teel Water Systems as a sink outlet works well to facilitate the removal of the water from the outlet. water by means of multiple following its sirsulasión along the same. The various ejectors 112 are secured to a mounting plate of the water riser 113 which is part of the die post assembly 20. To facilitate the operation of the water riser 112 the resilient water expulsion inlet lines 115 are secured to the water eyestor mounting plate to be secured to the water riser 112. Similarly, second sessions of the water expelling outlet line 120 are secured to the mounting plate of the eyestor to water. eyestor of water. In the real operation, the flow of water through the ejection inlet lines 115 within the water eyestores 112 srean a venturi effect which results in the formation of a vacuum which in turn directs the water through the first sessions of the line of expulsion of respective water and after the same forcibly expel water through the second section of the water expelling outlet line 120. Still a better appreciation of the workability • interior of the improved die manifold set 10 can be seen considering FIGURE 7 that shows a door of water ejection 125 through which the water passes as it is directed through the calibration finger and the insured manifold assembly and then flows through the first sections of the ejection outlet line. The water enters the water expelling door 125 from the tube of the internal multiple 130 the sual is connected to the proximal end 92 of the second component 90. ft It will also be appreciated that within the component 95b of the tube housing of the rear manifold there is a vacuum door 135. The distal end of the vacuum tube 140 is held in friction fit by the inner surface 68 of the intermediate tube 64 of the first section 25. When the second component 90 is frictionally secured to the distal end of the inner manifold tube 130, ^ the rear vacuum line and the vacuum tube 103 allow the empty to go inward through the openings in the radial grooves. Also shown is a water inlet port 145 through which water enters the rear manifold tube housing 95c through the water inlet line 100. The water thus flows through the respective tubes of the outer manifold 150. Each of the inner tubes of the manifold 130, the vacuum tube 140 and the outer manifold tube 150 are preferably made of stainless steel.

A connector of the housing 155 ensures the * accommodation of manifold tubes to a manifold mounting plate 160 which in turn is secured to the bolt 93 of the back of the die head by appropriate fasteners 163. Thus, a die manifold tube 165 extends through the own given, it has in it the tube of the outer manifold 150 through which the cold water is flowing in a first direction, the vacuum tube 140 through which a vacuum is pulled in the opposite direction to the cold water flow, and the inner manifold tube 130 through the sual the outgoing water is also pulled in that second diression after it exits through the water expulsion lines. Within the die the manifold tube 165 is a six-sided preferensia strut 175 which is soldered to assist in the support and stabilization of the outer manifold tube 150. It also minimizes the heat transfer between the cooling tubes and the heaters. This hexagonal structure 175 can be seen as welded to the extension tube of the mandrel 185 of the die, its mandrel extension tube is secured to the front end of the die in the holes of the die 187, which preferably are holes for bolts and nuts. The extension tube of the mandrel is threaded as a screw within a length of mandrel extension of the die, they are the extension of the mandrel of the sonoside type in the tansy. 20 In the present set, the die is assembled so as to show the portion of the multiple set shown and mentioned above with respect to FIGURE 7. When it is finished it looks like the extreme left portion of the die head. in FIGURE 2. The first session 25 then slides over the secured die multiple set 10. The first suerdas of the finger 190 are secured to »The threaded terminal corresponding to the terminal end of the manifold tube of the outer die. Helping to maintain a good seal there is a first pair of rings-092 placed within 5 of the appropriate grooves on the first inner surface of the end of the finger 52 as shown in FIGURE 7. The first tubular member is then placed as shown in FIG. the head of the saber of the die 17. The second tubular member ^^ on its first end 80 has a female quick mechanism release 194 of the type well known in the pipeline art. In the preferred embodiment of the machine associated with the process of this invention this quick release mechanism is a valve through the straight flow of brass, 1"(2.54 centimeters), manufactured by Parker-Hanifin, whose The mechanism is coupled with the quick release male mechanism 195 colosed at the second end 66 of the intermediate tube 64. * Thus, when used in combination to form three cirsular openings through a wall of subara tube it is seen in transverse socle , the flat sections 60 about one of the fingers of salibration are parallel to a flat sessión on a finger of salibrasión adyasente. A second pair of rings-0 198 is ensured in the appropriate sursos on the inner surface 68. In present use, the cooling water passes through the water inlet tube 150 and the sanal water resepters 70 inside the manifold salivation finger while a vacuum is pulled through the tube of the central multiple manifold 140 and through the radially extending channels 72 in the first section. The component 95b of the tube housing of the rear manifold is preferably welded to the vacuum tube 140. Similarly, the manifold tube housing 95c is preferably welded to the outer manifold tube 150. Meanwhile the component 95a of the manifold Rear manifold tube housing ^^ is preferably screwed into the inner manifold tube.

Preferably the flow rate is 4-5 gallons (15.14 - 18.925 liters) of water per minute for each set of tubes. In addition, the water flows from the water receiving channels into the second section 26 and thence through the openings 88 in the second tubular member in the outer surface 86 of the calibration finger. The water thus flows between the outer surface of the second section and the extruded plastis which surrounds the calibration finger when the plastis is being extruded. The water is deposited inside the extruded plastisium. Eventually the level of the water within the cavity reaches the distal tip 89 of the flexible tube 90 where it is sucked back through the interior of this second component 130 preferably into the second section 26, through the return tube water of the first somponent 130 surrounded by the die, and finally through the respec- tive tubes that are the outlet of the water return pipe are the water ejector 112. It will easily be apparent from the previous detailed description of the illustrative embodiment of the invention. that an extremely exlusive and partis- ally novel improved set of multiple is provided. Although the apparatus form described herein constitutes the preferred embodiment of the invention, it should be understood that the invention is not limited to this precise form of apparatus and that 1-0 Sambios can be made therein without departing from the invention, which is defined in the appended claims. ft

Claims (17)

1. CLAIMS 1. An improved manifold assembly for use with a die for the extrusion of plastis, including a set 5 of a water inlet pipe, a tube through which a vacuum is pulled, a water return pipe, a first section of the salibration finger that ^ has an outer surface, having the first session: 1) 10 suas minus a sanal water reseptor to the water inlet pipe; 2) a sanal to the tube through the sual pulls a vacuum; and 3) the water return pipe positioned centrally of the outer surface of the first session, having the first session also formed in the
2. The same openings are made to the sanal connected to the tube through which a vacuum is pulled and JA a second session of the salibration finger which also has an outer surface and an inner sanal, the second session having the water return tube 20 sentrally released of the outer surface of the second session. and the second section also having openings formed in the same section to the internal sanal. 2. The set of multiple of agreement are the reivindisasión 1, where the outer surface of the
3. The first section has at least one groove formed therein. 3. The manifold assembly according to claim 1, wherein the water return pipe has a first component and a second component secured one to the 5 another, finishing the first component within the second section, and extending the second component beyond the second section.
4. 4. The manifold assembly according to claim 4, wherein the second component is curved.
5. 5. The multiple set according to claim 3, wherein the second somponent is flexible.
6. 6. The manifold set according to claim 2, wherein suing minus a groove is a radial groove.
7. 7. The multiple set according to claim 2 wherein a groove is a spiral groove.
8. 8. The multiple set of agreement with the claim 6 where a surso is also a spiral surso, the spiral surso intersesta are suando minus a 20 radial groove.
9. 9. An improved manifold assembly for use with a die for plastic extrusion, comprising a water inlet tube, a tube through which a vessel is drawn, a water return tube, a first measurement of the gauging finger having an outer surface, the first section having: 1) at least one water receiving channel connected to the water inlet pipe; 2) a sanal is shown to the tube through the sual pulls a vasio; and 3) the water return pipe disposed sentrally of the outer surface of the first session, the first section having formed therein a ^ spiral and suas minus two radial grooves
10. 10 intersestando spiral the susoo minus two radial sursos, having the first sessión formed in the same openings areestate to the sanal sonestado to the tube through the sual pulls a vasío, the openings of the first sessión delalizadas in the radial surso, taking the return tube of 15 water a first component and a second component secured to one another, the first component ending within the second session, and the second component extending beyond the second session being the second flexible component, and 20 a second section of the finger of salibration having an outer surface and an inner channel, the second section having the water return pipe spaced sentrally from the outer surface of the second section. and the second section having also openings formed in the 25 same connected to the inner channel, the openings of the first section having a first diameter and the openings ft of the second session having a second diameter, the second diameter being larger than the first diameter. 10. An improved manifold assembly for use with a die for plastic extrusion, comprising a plurality of tubular assemblies, comprising one of the tubular assemblies a water inlet tube, a tube through the sual draws a basin, a water return tube, a first section of the finger Calibration having an outer surface, having the first section: 1) at least one sanal water receiver conestado to the water inlet pipe; 2) a channel connected to the tube through the 15 which pulls a vacuum; and 3) the water return pipe positioned centrally of the outer surface of the first section, the first section having formed therein openings connected to the channel connected to the tube through which a vacuum is pulled, and a second section. of the calibration finger having an outer surface and an inner channel, the second section having the water return pipe positioned centrally of the outer surface of the second section, and the second section having apertures formed therein 25 are tested to the interior sanal.
11. 11. The multiple set according to claim 10, wherein the outer surface of the first session has at least one groove formed therein.
12. 12. The manifold assembly according to claim 10, wherein the water return tube has a first somponent and a second somponent secured to one another, the first component terminating within the second second section, and second somponente extending more 10 beyond the second session.
13. 13. The set of multiple of agreement are the vindication 12, where the second somponent is survo
14. 14. The multiple set of agreement are the vindication 12, where the second somponent is flexible. 15
15. 15. The set of multiple of agreement are the reivindisasión 11, where suando less a surso is a surso ^ - radial.
16. 16. The set of multiple according to claim 11, wherein suando minus a surso is a groove 20 spiral.
17. 17. The set of manifold according to claim 15, wherein a groove is also a spiral groove, the spiral groove intersecting at least one radial groove. 25