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EP0892713A1 - Procede et dispositif pour conditionner des pieces en plastique avec de la vapeur d'eau - Google Patents

Procede et dispositif pour conditionner des pieces en plastique avec de la vapeur d'eau

Info

Publication number
EP0892713A1
EP0892713A1 EP97921605A EP97921605A EP0892713A1 EP 0892713 A1 EP0892713 A1 EP 0892713A1 EP 97921605 A EP97921605 A EP 97921605A EP 97921605 A EP97921605 A EP 97921605A EP 0892713 A1 EP0892713 A1 EP 0892713A1
Authority
EP
European Patent Office
Prior art keywords
drum
plastic parts
steam
receiving
water vapor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97921605A
Other languages
German (de)
English (en)
Inventor
Bernhard Lipp
Edmund Buscher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Buscher Edmund
Meyer Georg
Original Assignee
Buscher Edmund
Lipp Bernhard
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19615937A external-priority patent/DE19615937C1/de
Application filed by Buscher Edmund, Lipp Bernhard filed Critical Buscher Edmund
Publication of EP0892713A1 publication Critical patent/EP0892713A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/009—After-treatment of articles without altering their shape; Apparatus therefor using gases without chemical reaction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/049—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using steam or damp
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material

Definitions

  • the invention relates to a method for conditioning plastic parts that are capable of absorbing water with steam, according to the preamble of claim 1, and to an apparatus for carrying out the method according to claim 8.
  • Plastic parts that are able to absorb water, in particular polyamide plastic parts, that have to be flexible and elastic are used in the automotive industry and other branches. After the injection molding process, however, such plastics are brittle and unsuitable for further processing. Since such parts are often pressed in or processed under pressure, they would burst or be damaged due to the brittleness at high pressures.
  • Plastic parts of this type which are capable of absorbing water, in particular polyamide plastic parts are therefore conditioned in a known manner with water in such a way that these parts are placed in a water bath for four to eight hours until the plastic has taken up the necessary water content . Or the parts can be stored for about four to five weeks in an atmosphere with high humidity, because then the parts condition due to natural water.
  • both methods are not economical for cost reasons. In particular, no entrepreneur can afford to store plastic parts long enough to trigger a self-conditioning process.
  • DE 39 26 169 A1 discloses a process for improving the water absorption capacity of crosslinked, water-swellable polymers by treating water-containing fine-particle polymer gels with a solids content of 20 to 65% by weight at temperatures of at least 50 degrees Celsius with water vapor become, whereby the solid of the water-containing polymer gels is increased by at most 30 wt.
  • DE-AS 21 61 446 is a continuously working washing and drying machine for small parts, especially rubber and Plastic parts, known with a rotatable drum, which is elongated and tubular and has an axis slightly inclined with respect to the horizontal. There is a filling opening at the lower end, outlet opening at the higher end. A screw conveyor is arranged on the inner wall and conveys the small parts to be treated from the filling opening to the outlet opening.
  • the drum has a first spray device with a circulating pump and a container for the liquid that flows out at the lower end of the drum.
  • the drum has a second spray device for applying a rinsing liquid; the drum also has air nozzles and a blower for drying the small parts.
  • this drum is not suitable for conditioning plastic parts that are able to absorb water.
  • the invention has for its object to provide a method and an apparatus of the type mentioned, with which plastic parts which are able to absorb water, in particular polyamide plastic parts, can be conditioned in the shortest possible time.
  • the solution according to the invention consists in exposing the plastic parts to a water vapor atmosphere consisting of water vapor heated to over 100 degrees for a period of 3 to 30 minutes, preferably 10 to 15 minutes.
  • the plastic parts are preferably moved in water vapor during the water vapor treatment, just as the plastic parts can also be exposed to an excess pressure within the water vapor atmosphere during the water vapor treatment.
  • the plastic parts are preferably injection molded parts made of polyamide, which are subjected to water vapor treatment directly after the injection molding process.
  • the water vapor can also be blown into a loose variety of plastic parts under pressure.
  • the temperature of the water vapor can preferably be around 120 degrees.
  • the plastic parts can be moved continuously or discontinuously through the water vapor, so that it is then a continuous process.
  • the inventive method has the advantage that with the same plastic parts that are able to absorb water, in particular polyamide plastic parts, can be conditioned with water in a very short time, namely in 5 minutes to 30 minutes, preferably 10 to 15 minutes.
  • the duration of the treatment depends on the wall thickness of the plastic parts; the treatment time for thin-walled parts is shorter than for thick-walled parts. Therefore, water basins are no longer necessary, in which such parts have to be conditioned for hours in the prior art.
  • the method and the device therefore enable considerable labor and capital savings.
  • a device is characterized by a receptacle with a receptacle and removal opening for the plastic parts, to which a steam generator for generating and introducing water vapor into the receptacle is connected and steam can be applied to the plastic parts within the receptacle.
  • the receptacle is preferably a rotary drum which is rotatably mounted within a housing sealed against the external atmosphere and can be driven in rotation by means of a drive wheel, the outer surface of the rotary drum for the entry of the water vapor into the inside of the rotary drum consisting of a screen plate and the steam generator in the Area of the rotary drum is arranged within the housing.
  • the steam generator can be arranged along the rotary drum below it and can consist of an electrical heating coil which is arranged in a water bath.
  • a drip pan for the water vapor condensed to water can be arranged beneath the steam generator over the entire length of the rotary drum.
  • the device is preferably one through which the plastic parts can be moved or can be passed through the receiving container continuously or discontinuously within the water vapor.
  • the receptacle can be pressurized
  • the receptacle can be an upright, stationary drum which is sealed pressure-tight against the external atmosphere and has a plurality of tubular receiving cylinders which are arranged inside the drum and are rotatably mounted and drivable in a circular manner about the central axis of the drum the drum has an inlet opening in its upper cover surface for loading plastic parts of the receiving cylinder passing under the inlet opening and the drum has an outlet opening in its lower cover surface, the diameter of which corresponds approximately to the diameter of a receiving cylinder for releasing the lower end of the one above the outlet opening passing recording cylinder, wherein a steam feed line opens into the drum and a condensation vessel is arranged above the drum, which is connected to the drum with a steam discharge to relax the excess pressure and absorb and condense the water vapor.
  • a steam feed line opens into the drum and a condensation vessel is arranged above the drum, which is connected to the drum with a steam discharge to relax the excess pressure and absorb and condense the water vapor.
  • FIG. 1 shows a section through a schematically illustrated device with a horizontally arranged rotating drum, which operates at normal atmospheric pressure
  • FIG. 2 shows a section through a side view of FIG. 1
  • FIG. 3 shows a device with an obliquely arranged drum, in which: a plurality of receiving cylinders are rotatably arranged
  • FIG. 4 shows a side view of FIG. 3
  • FIG. 5 shows a device with treadmills arranged one above the other for transporting the parts through the housing
  • FIG. 6 shows a side view of FIG. 5
  • FIG. 7 shows a device with pressurized receiving container with vertically arranged receiving cylinders
  • FIG. 8 shows a side view of FIG 7
  • FIG. 9 shows a section through another schematically illustrated device with a filling drum arranged in a circle, which can be switched in cycles, three upright steam drums, a steam discharge drum and an ejection drum and a steam generator arranged on the side.
  • FIG. 10 shows a plan view of FIGS.
  • FIG. 11 shows an enlarged side view of FIG. 9 to show the steaming cycle of the water vapor, the receiving cylinders of the drum being shown in a longitudinally unwound manner.
  • Figures 1 and 2 show a receptacle consisting of a housing 1, in which a rotating drum 2 is mounted horizontally and rotatably about its central axis on rollers 5, 5 ', 6; the housing 1 is sealed against the outside atmosphere.
  • the housing 1 rests on a frame 17 which has wheels 18 for moving the device.
  • the outer surface of the rotary drum 2 has holes and preferably consists of a screen plate.
  • the inside of the outer surface of the rotating drum 2 has a screw or screw thread 3 for transporting plastic parts 21, preferably made of polyamide, through the rotating drum, which are located in the receiving space 4 of the rotating drum for conditioning.
  • a drive belt 7 for driving the rotary drum is wrapped around the rollers 5, 5 'and a drive wheel 22 which is driven by a motor.
  • Below the rotating drum 2 there is a semi-cylindrical collecting plate 8, which has an elongated opening 9 of the length of the rotating drum 2 at the lowest point.
  • a steam generator 11 is inserted from below, which consists of an elongated box, on the bottom of which an electrical heating coil 14 or heating pipes are arranged and which is covered by a perforated plate 10.
  • the box also has a water level indicator and possibly an overflow.
  • a pump 15 pumps water from the collecting trough 13 into the steam generator 11 via a line 16.
  • the plastic parts 21 are brought up on a conveyor belt 19 and filled via an inclined chute 20 through an inlet opening at the front end of the rotary drum 2.
  • the heating coil 14 heats the water in the steam generator 11 and generates water vapor, which passes through the perforated plate 10 into the interior 4 of the rotary drum 2 and acts on and conditions the plastic parts 21.
  • the screw or screw thread 3 as continuous or passthrough ⁇ means the plastic parts are carried by the rotary drum 2 21, either continuously or discontinuously, and mixed by the movement direction as the steam atmosphere Maschinen ⁇ through the rotary drum and then arrive at other end of the Rotary drum to the outside. After a short drying process, the parts are ready for use.
  • Figures 3 and 4 show a stationary cylindrical drum 23 made of screen plate, which is arranged obliquely in the housing 1 and which is closed at both ends by means of cover surfaces 43, 43 '.
  • the receiving cylinders 24, 24 ' can either be rotated together around the central axis of the drum 23, or the receiving cylinders 24, 24' can additionally be rotatably supported about their own central axis.
  • the top surface 43 at the upper end of the drum 23 or at its highest point has an opening, preferably the diameter of a receiving cylinder, through which the plastic parts 21 are filled into a receiving cylinder via a chute 28, which is just at its upper, open end at the Opening rotated past within the top surface 43.
  • the plastic parts 21 are conveyed up via a horizontal conveyor and transferred to a vertical conveyor 26 arranged in the housing 1 and provided with conveyor lamellae 27 and conveyed upwards, from where the plastic parts 21 reach the chute 28.
  • the plastic parts 21 are transported by gravity through the receiving cylinders 24, 24 '.
  • the lower cover surface 43 'of the drum 23 also has an opening for dispensing the conditioned plastic parts 21 via an outlet shaft 25 which has approximately the diameter of a receiving cylinder.
  • the parts 21 are dispensed.
  • the remaining machine parts and the function correspond to the device in FIGS. 1 and 2.
  • FIGS 5 and 6 show a device consisting of the housing 1, in which a plurality of approximately horizontally and longitudinally arranged treadmills 30, 30 'are arranged in a container 29 made of perforated plate, which are slightly offset from each other and the following treadmill has the opposite direction to the previous treadmill.
  • FIGS. 7 and 8 show a further device which has a pressure container in the form of a drum 34 inside a housing 33, which is an upright, closed, closed drum 34 which is sealed in a pressure-tight manner against the external atmosphere and in which a plurality of tubular receiving cylinders 36, 36 ' , 36 "are arranged, which are rotatably mounted and drivable in a circle around the central axis of the drum.
  • the drum 34 has in its upper cover surface an inlet opening with a filling funnel 35 for loading plastic parts 21 of the receiving cylinder, each passing under the inlet opening
  • the diameter of the inlet opening preferably corresponds approximately to the diameter of a receiving cylinder.
  • the drum 34 has an outlet opening in its lower top surface, the diameter of which also has approximately the diameter of a receiving cylinder for releasing the lower end of the receiving cylinder 36, 36 ', 36 "passing over the outlet opening; the conditioned plastic parts pass through an outlet shaft 40
  • a steam supply line 41 which is connected to a closed steam generator 37, opens into the drum 34 from below, preferably the steam supply line 41 opens into the rotational direction of the receiving cylinder after the inlet opening of the drum 34, so that always the one with Plastic cylinders filled with plastic parts are pressurized with water vapor, which is why the recording cylinders are preferably made of non-perforated solid sheet metal so that no pressure equalization can take place between them.
  • a condensation vessel 38 is arranged above the drum 34 and is connected to the drum 34 by a steam discharge line 39.
  • the receiving cylinders 36, 36 ', 36 are preferably set in rotation in a clocked manner, the excess pressure within the receiving cylinder is released through the steam discharge line 39 and the steam is passed into the condensation vessel 38 and condenses there, after which the water flows back into the steam generator, thus loading a receiving cylinder in the first cycle, pressurizing and steaming it in the subsequent cycle, conditioning in the subsequent cycles and relaxing in the last cycle and removing the plastic parts; the number of cycles is equal to the number of receiving cylinders, and in this case too, it is in principle a continuous device, as is the case with the device described below with reference to FIGS. 9, 10 and 11.
  • the mobile device shown in FIGS. 9, 10 and 11 works in the same way and additionally has a steam / water circuit with a condenser in order to minimize the loss of water.
  • the mobile device again consists of a housing 44 in which a drum 45 is rotatably arranged about a central, vertical axis 69.
  • the drum 45 has six upright receiving cylinders 46, 47, 48, 49, 50, 51 arranged at equidistant intervals on a circle, in which case the receiving cylinder 46 has assumed such a position in FIG. 9 that plastic parts have been inserted into it slide 46 protruding above the receiving cylinder.
  • the top of the drum 45 is covered by a fixed cover plate 52, which has five or even six holes 73, 74, 75 which coincide with the receiving cylinders 46-51 and are arranged at equidistant intervals like the receiving cylinders; likewise, the drum is covered from its underside by means of a fixed base plate 71, within which holes 72, which coincide with the receiving cylinders 46-51 and are arranged at equidistant intervals like the receiving cylinder, for steam to pass through the base plate 71 are arranged; the diameter of the holes 72 is smaller than that of the smallest plastic parts to be conditioned. In this way, the drum 45 rotates between the cover plate 52 and the base plate 71.
  • a support plate 68 is arranged plane-parallel at a distance, on which a plurality of lifting cylinders 63, 64, 65, preferably three, are fixedly mounted, which are in equidistant positions Distances as the recording cylinders are arranged.
  • Lids 53, 54, 55 which can be lifted and lowered, are each capable of protruding through the hole 73-75 located beneath them in the cover plate 52 or, in their upper position, release the mouth of the respective receiving cylinder 46-51.
  • Vapor supply lines 60, 61, 62 are brought from below to the three storage cylinders 46, 51, which can each be closed by means of the cover 53-55 controlled by the lifting cylinders 63-65, and fastened to the base plate 71.
  • the device To the side of the drum 45, preferably outside the housing 44, the device has a steam generator 57, the output of which is connected to the steam feed lines 60-62.
  • the support plate 68 forms with the cover plate 52 a vapor space which is sealed off from the remaining volume within the housing 44.
  • a steam-water line 66 is connected to the steam chamber, starting with an opening within the support plate 68, a fan 70 being arranged within the steam-water line 66.
  • the other end of the steam / water line 66 coincides with one of the holes 73-75 inside the cover plate 52 above the receiving cylinders 46-51; the steam-water line 66 extends above the hole in the cover plate 52, water and air being able to be blown through the line 66 and the corresponding receiving cylinder down to the water basin 58.
  • the operation of the device is as follows, with all receiving cylinders 46-51 being unwound along a line in FIG. 11 for the sake of better explanation.
  • the first batch of plastic parts is filled into the receiving cylinder 46.
  • the drum 45 then cycles further by a predetermined arc distance, that is to say by one cycle, and is centered in this position by a centering pin 59.
  • the receiving cylinder 51 comes under the position of the slide 56, the receiving cylinder 46 slides further into the position of the receiving cylinder 47 shown in FIG. 10.
  • Two further receiving cylinders 51, 50 are then subsequently filled with plastic parts, so that subsequently 10, the receiving cylinders 47, 48, 49 shown in the position there are filled with plastic parts.
  • These three receiving cylinders 47, 48, 49 (FIG.
  • the water vapor conditioning method according to the invention and the water vapor conditioner device for conditioning plastic parts which are brittle after production by the injection molding process, in particular polyamide plastic parts, can be used commercially by water storage.
  • the usefulness of the object of the invention lies above all in the considerable reduction in the time required for conditioning and thus in an increase in the economy of the production of ready-to-use elastic plastic parts.

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

L'invention concerne un procédé pour conditionner avec de la vapeur d'eau, des pièces en plastique (21) capables d'absorber de l'eau, de préférence des pièces en polyamide, ainsi qu'un dispositif pour mettre en oeuvre ledit procédé. Les pièces en plastique (21) sont exposées pendant une période comprise entre 3 et 15 minutes à une atmosphère de vapeur d'eau, constituée de vapeur d'eau chauffée à plus de 100 °C, et sont déplacées pendant le traitement dans la vapeur d'eau. Les pièces en plastique (21) peuvent être simultanément exposées à une surpression à l'intérieur de l'atmosphère de vapeur d'eau. Le dispositif comprend un contenant (2, 23, 29, 34) avec une ouverture pour le logement et le retrait des pièces en plastique (21), auquel est raccordé un générateur de vapeur (11, 37) servant à générer et introduire de la vapeur d'eau dans ledit contenant, les pièces en plastique (21) pouvant être exposées à la vapeur d'eau à l'intérieur du contenant. Ce dernier se présente de préférence sous forme d'un tambour rotatif (2, 23) en tôle perforée, qui est monté de façon à tourner à l'intérieur d'un boîtier (1) étanche à l'atmosphère extérieure, et peut être entraîné en rotation par une poulie d'entraînement (22).
EP97921605A 1996-03-31 1997-04-01 Procede et dispositif pour conditionner des pieces en plastique avec de la vapeur d'eau Withdrawn EP0892713A1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE19612802 1996-03-31
DE19612802 1996-03-31
DE19613097 1996-04-01
DE19613097 1996-04-01
DE19615937 1996-04-22
DE19615937A DE19615937C1 (de) 1996-03-31 1996-04-22 Verfahren und Vorrichtung zum Konditionieren von Kunststoffteilen mit Wasserdampf
PCT/DE1997/000693 WO1997036736A1 (fr) 1996-03-31 1997-04-01 Procede et dispositif pour conditionner des pieces en plastique avec de la vapeur d'eau

Publications (1)

Publication Number Publication Date
EP0892713A1 true EP0892713A1 (fr) 1999-01-27

Family

ID=27216096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97921605A Withdrawn EP0892713A1 (fr) 1996-03-31 1997-04-01 Procede et dispositif pour conditionner des pieces en plastique avec de la vapeur d'eau

Country Status (3)

Country Link
EP (1) EP0892713A1 (fr)
AU (1) AU2762797A (fr)
WO (1) WO1997036736A1 (fr)

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JPS6458510A (en) * 1987-08-29 1989-03-06 Sumitomo Heavy Industries Automatic humidity controller
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Also Published As

Publication number Publication date
AU2762797A (en) 1997-10-22
WO1997036736A1 (fr) 1997-10-09

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