EP0769998A1 - Presse d'injection pour traiter des matieres thermoplastiques - Google Patents

Presse d'injection pour traiter des matieres thermoplastiques

Info

Publication number
EP0769998A1
EP0769998A1 EP96919539A EP96919539A EP0769998A1 EP 0769998 A1 EP0769998 A1 EP 0769998A1 EP 96919539 A EP96919539 A EP 96919539A EP 96919539 A EP96919539 A EP 96919539A EP 0769998 A1 EP0769998 A1 EP 0769998A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
housing
channel
storage space
injection molding
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Withdrawn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
EP96919539A
Other languages
German (de)
English (en)
Inventor
Stefan Bock
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.)
Kautex Maschinenbau GmbH
Krupp Kautex Machinenbau GmbH
Original Assignee
Kautex Maschinenbau GmbH
Krupp Kautex Machinenbau GmbH
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
Application filed by Kautex Maschinenbau GmbH, Krupp Kautex Machinenbau GmbH filed Critical Kautex Maschinenbau GmbH
Publication of EP0769998A1 publication Critical patent/EP0769998A1/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Withdrawn legal-status Critical Current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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
    • B29C2045/545—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw alternately operating injection plungers

Definitions

  • the invention relates to an injection molding machine for processing thermoplastics, which has at least one
  • Plasticizing unit at least one injection molding cylinder with an associated piston for emptying this cylinder and at least one injection mold.
  • the plasticizing unit should be operated continuously, i.e. , The screw generally present in such a plasticizing unit should rotate continuously independently of the successive working cycles in order to be able to maintain as uniform a pressure as possible within the plasticizing unit. Continuous operation of the plasticizing unit also favors as constant as possible with regard to other operating conditions and parameters, for example temperature and viscosity of the plasticized plastic
  • An injection molding machine that at least largely takes these requirements into account should also be designed to save space, in particular with regard to the design and arrangement of flow channels and injection molding cylinders in relation to their productivity, so that, if necessary, a number of injection molding tools can be assigned to a plasticizing unit alternatively, the plasticizing unit feeds it with plastic.
  • Such an arrangement is based on the consideration that, in many cases, in view of the time it takes in a working cycle for the injection of the plastic into the respective injection mold, the cooling of the plastic in this tool and the removal of the finished article from the tool is, a correspondingly dimensioned plasticizing unit should feed at least two injection molding tool units in order to use the available capacity of the plasticizing unit as completely as possible.
  • This known injection molding device has the advantage that the plasticizing unit can be operated continuously, whereby the essentially linear flow of the plastic from the plasticizing unit into the injection mold ensures that all plastic particles have approximately the same dwell time in the System before they get into the injection mold. This is also a measure that serves to achieve a good quality of the end product.
  • this embodiment of the known injection molding machine has the disadvantage that it is very long. It is also provided with valves which are actuated by the flowing plastic.
  • pp. 70-72 discloses an injection molding machine which is also provided with a plasticizing unit, an injection molding tool and a metering cylinder arranged in between, which is emptied by a piston in the direction of the injection mold.
  • This known injection molding machine is designed in such a way that those material parts which were last introduced into the dosing cylinder when it was filled are first ejected from the dosing cylinder by the piston and, consequently, those material parts which were first introduced into the dosing cylinder when it was filled, are last discharged these are expelled.
  • the invention is therefore based on the object of designing an injection molding machine for processing plastics in such a way that it does not have the disadvantages described above.
  • An arrangement should also be possible in which two or more injection mold units, each with an injection molding cylinder, are assigned to a plasticizing unit and these injection molding cylinders are alternately filled with plastic from this plasticizing unit, during which one injection molding cylinder and the subsequent injection are then filled ⁇ inject the plastic into one of the injection molds, the plastic in the other injection mold cools down while maintaining the holding pressure and, after sufficient cooling, the finished products may also be removed from the other injection mold.
  • the injection molding cylinder has a sleeve which axially extends in a housing between a position in which the connection to the injection mold is interrupted and a position in which the connection to the injection mold exists. and is arranged so that it can be pushed, at least in the position in which the connection to the injection mold is interrupted, there is a passage between the sleeve and the housing and is connected at one end to the storage space delimited on the inside by the sleeve at its entry end, and the feed channel for the plastic coming from the plasticizing unit is connected to the same in the region of the other end of the passage and the outlet channel for the plastic Storage space stored plastic in the direction of the injection mold at the end of the storage space facing away from the inlet end and the extent of the longitudinal displacement of the sleeve is selected so that in one end position of the sleeve the outlet channel is closed from the storage space and a flow of plastic material is not possible and in the other end position of the sleeve, the outlet
  • This type of configuration of the device enables the plastic to be guided within it, which at least makes the plastic's dwell time more uniform, so that the plastics that were first introduced into the device also leave it first, that is, as the first get into the mold nests of the injection mold.
  • the injection cylinder relative to the plasticizing unit and / or injection molding tool, for example. B. laterally offset, so that the entire device can be performed relatively short.
  • the shut-off means required to control the material flows during the individual phases of a working cycle in the injection cylinder so simply that they do not cause any significant complication of the device, are less susceptible to repair and can also be controlled by simple means. If the plasticizing unit is assigned more than one unit consisting of injection cylinder and injection mold and the two or more units are alternately fed by the plastication unit, it is not necessary to feed into the feed channels from the plastication unit to the individual injection molding cylinder and injection mold.
  • Fig. 1 in the scheme of the structure of an injection molding device, partly in section, Fig. 2A-2D in the scheme and each in longitudinal section
  • FIG. 1 shows schematically the basic structure of an injection molding device on which the invention is implemented.
  • the device has a plasticizing unit 10, an injection molding cylinder 11 and an injection mold 12, which interact in a manner to be described.
  • the injection molding cylinder 11 is provided with a housing 14, in the cylindrical longitudinal bore 15 of which a sleeve 16 is arranged to be longitudinally displaceable.
  • the sleeve 16 which is open at one end, is assigned a likewise axially displaceable ejection piston 18, the outer diameter of which is slightly smaller than the inner diameter of the essentially cylindrical sleeve 16 on the inside, so that an annular gap is formed between the ejection piston 18 and the inner circumferential surface of the sleeve 16 19 remains (see, e.g., FIG. 2A).
  • the bore 15 settles into a coaxial section 20 over the area receiving the sleeve 16 smaller diameter in which the ejection piston 18 is guided.
  • the latter is provided at its end facing away from the housing 14 with a first drive piston 22 which is guided in a first hydraulic cylinder 24.
  • the cylinder 24 is attached to the housing 14 by bolts or the like 26.
  • the interior space 27 delimited by the sleeve 16 is the storage space for the plastic material to be introduced into the injection mold 12.
  • the sleeve 16 is closed at its other end 29 and connected to the piston rod 30 of a likewise coaxially arranged second piston 32, which is guided in a second hydraulic working cylinder 34.
  • the bore 15 is provided on its end section 36 facing the first cylinder 24 with a somewhat larger diameter.
  • the end section 38 of the sleeve 16 facing the first cylinder 24 has a somewhat larger outer diameter which corresponds to the inside diameter of the bore 15 in its area of smaller diameter, the end section 38 of the sleeve 16 being in the one end position shown in FIG. 1 ⁇ ren diameter is located in the section 36 of larger diameter of the bore 15, which has a corresponding axial extent.
  • FIGS. 1 In the second end position of the sleeve 16, which is shown in FIGS.
  • a partial area of the thickened end section 38 of the sleeve 16 is located in the area of the bore 15 of smaller diameter, the outer lateral surface of the thickened area 38 of the sleeve 16 sealingly cooperates with the area of the bore 15, which connects to the area 36 and is provided with the smaller diameter.
  • the thickened area of the sleeve 38 thus forms the closure part of a shut-off element which can be moved back and forth between an open and a closed position.
  • the housing 14 is provided with an extension 40, the peripheral region of which bears against the end face 42 of the housing 14 and is provided in the central area on its side facing the housing 14 with a recess 44 which has a somewhat larger diameter than the sleeve 16. Furthermore, the extension 40 is provided with a bore 39 provided for the passage of the piston rod 30.
  • the housing 14 is provided near its end face 42 facing the second cylinder 34 with an essentially radially extending feed channel 46 for the plastic material coming from the plasticizing unit 10.
  • This feed channel 46 opens into the recess defined by the bore 15 in the housing 14.
  • the sleeve 16 is provided on its outer jacket with a distribution channel 50, which is designed as a groove-shaped depression or groove 50 and is essentially circumferential around the sleeve 16, but is inclined to the longitudinal axis of the sleeve 16.
  • the distribution channel 50 is arranged relative to the feed channel 46 so that the one apex region 52 of the distribution channel 50 is in the end position of the sleeve 16 shown in FIG.
  • the distribution channel 50 starts from this apex region 52 at an acute angle to the longitudinal axis of the housing 14 and thus the sleeve 16 on both sides of the latter in the direction of the thickened end section 38 of the sleeve and the second apex region 53 of the distribution channel 50 opposite its first apex region 52 in the direction of the free inlet end 28 the sleeve 16 is arranged offset.
  • An annular gap 54 adjoins the distribution channel 50, which is delimited on the outside by the inner circumferential surface of the housing 14, which is delimited by the outer circumferential surface of the sleeve 16 and the inner circumferential surface of the bore 15.
  • the annular gap 54 extends from the distribution channel 50 to the inlet end 28 of the sleeve 16, which ends at a short distance from the opposite wall of the bore 15, where the Annular gap 54 undergoes a deflection and merges into storage space 27.
  • the limitation of the annular gap 54 at the free end 28 of the sleeve 16 the opposite side corresponds to the course of the distributor channel 50.
  • the thickened end section 38 of the sleeve 16 closes this annular gap 54 Distribute housing 14 supplied plastic material over the circumference of the sleeve 16. This type of distribution is known from extrusion heads, in which, however, the objective is to convert an incoming full plastic strand into a hollow strand.
  • the storage space 27 enclosed by the sleeve 16 is tapered at its end facing the second cylinder 34 corresponding to the free end portion of the ejection piston 18 to be inserted into the storage space, as can be seen in the drawings. Dead spaces in which plastic particles could remain uncontrolled are thereby avoided. From the apex area of the storage space 27 there is an outlet channel 58 which, after a short axial section, extends radially outwards, this radial section being slightly offset in the axial direction with respect to the apex area 52 of the distributor channel 50.
  • Decisive for the position of the radial section of the outlet channel 58 is the position of a connecting channel 60 which radially penetrates the wall of the housing 14 and serves to establish the connection between the outlet channel 58 and the connecting channel 74 in the injection mold 12 during the injection molding process .
  • the connection between the storage space 27 and the injection molding tool 12 is interrupted, since the outlet channel 58 assumes a position offset with respect to the connecting channel 60.
  • the two channels 58 and 60 are aligned with one another, so that there is a connection between the storage space 27 and the mold cavity (s) 76 of the injection molding tool 12 is.
  • the sequence of a work cycle is explained below with reference to FIGS. 2A-2D.
  • the memory delimited by the sleeve 16 cherraum 27 for the plastic material has been completely or almost completely emptied by the ejection piston 18 inserted into the sleeve 16, whereby due to the force exerted by the ejection piston 18 in the ejection direction 62, the sleeve 16 at the beginning of the ejection stroke in the direction of arrow 62 in its in 2A, the end position shown had been moved, in which its end face 29 bears against the inner boundary surface 64 of the projection 40.
  • the sleeve 16 assumes a position in which a portion of its thickened end section 38 is located in the area of the smaller diameter of the bore 15, as a result of which a tight seal is created which blocks the connection between the feed channel 46 and the storage space 27 as can be seen in FIGS. 2A and 2D.
  • the plastic material displaced from the storage space 27 delimited by the sleeve 16 by the ejection piston 52 is thus prevented from flowing back in the direction of the inlet channel 46.
  • the parts assume approximately the position shown in FIG. 2A.
  • the injection mold 18 After the injection mold 18 has been filled by the ejection piston 18, it is necessary to keep the plastic material in the injection mold under pressure in the holding pressure phase and, if necessary, to push small amounts of material in the direction of the injection mold so as to, for example, cavities to be filled in the mold cavity caused by the shrinking of the plastic material which cools in the injection mold.
  • the actual ejection process has ended before the ejection piston 18 has reached the end position defined by the bottom of the cylinder 24, which serves as a stop, as shown in FIG. 2A.
  • the remaining small distance between the position at the end of the discharge stroke of the discharge piston 18 and the maximum stroke limited by stops can be used for the reprint.
  • the first apex region 52 of the distributor channel 50 is brought into a position in which it lies opposite the feed channel 46 in the housing 14.
  • the end portion 38 becomes larger in diameter the sleeve 16 is moved out of the area of the bore 15 of smaller diameter, so that, as shown in FIG. 1B, the plastic material flowing in through the feed channel 46 now again through the distributor channel 50 and the annular gap 54 between the sleeve 16 and the housing 14 and the annular gap 19 can flow into the storage space 27 between the sleeve 16 and the ejection piston 18, the ejection piston 18 being pushed back against the direction 62 at the same time until it assumes its second end position, that is to say according to FIG. 2C.
  • the storage space 27 is filled again, and depending on the amount of material required to fill the injection mold in each working cycle, the degree of filling of the storage space 27 and thus the end position of the ejection piston 18 surrender. Due to the fact that the two channels 58 and 60 are not aligned with one another, the material cannot continue to flow in the direction of the injection mold 12 when the storage space 27 is filled.
  • the amount of plastic material flowing into the storage space 27 during each working cycle essentially depends on the position of the ejection piston 18 at the end of the holding pressure phase. But this also ensures that the parts of the plastic material that first flowed into the storage space 27 are also the first to be displaced from the storage space in the direction of the injection mold 12 (first in-first out). This is favored by the conical designs of the storage space and the free end of the ejection piston 18.
  • the configurations of other parts in the injection molding cylinder 11 also contribute to achieving favorable flow conditions.
  • the plastic material coming from the plasticizing unit 10 flows to a large extent on leaving the feed channel 46 into the groove-shaped distributor channel 50 which is arranged on the outer circumferential surface of the sleeve 16, so that part of the material flows directly onto the feed channel channel 46 facing away from the circumferential region of the sleeve 16 and the most uniform possible distribution of the plastic material to reach over the outer circumference of the sleeve 16.
  • the material flows from the distribution channel 50 into the annular gap 54 adjoining it on the way from the first crown region 52 to the second crown region 53.
  • the plastic material is evenly distributed around the sleeve 16, with the second apex region 53 of the distributor channel 50, which facing the free end 28 of the sleeve, forms a closed, annular stream made of the plastic material, which initially points in the direction of the free end 28 of the sleeve 16 and after passing through the same in the area between the inner lateral surface and the ejection piston
  • annular gap 19 located annular gap 19 and flows through this and at the same time displacement of the ejection piston 18 into the storage space 27.
  • the annular distribution around the sleeve 16 is also advantageous because it then also enables the material to flow uniformly into the storage space 27.
  • the length of the annular gap 19 decreases until finally in the position of the parts of the annular gap shown in FIGS. 1 and 2C
  • the outer diameter of the sleeve 16 corresponds to the inner diameter of the bore 15 in the housing 14, so that there is a tight fit in this area between the outer jacket of the sleeve 16 and the inner jacket of the bore 12, the on the one hand enables axial displacements of the sleeve 16 within the housing 14 and thereby guides the sleeve 16, on the other hand at least largely prevents the penetration of plastic into the separating surface between the housing 14 and the sleeve 16.
  • the piston 22 of the first working cylinder becomes at the beginning of the following working cycle 24 acts with the consequence that with the start of the displacement of the ejection piston 18 in the direction of arrow 62, the sleeve 16 with the storage space 27 enclosed by it and the plastic material stored therein from the position shown in FIG. 2C back to the position shown in FIG. 2D is axially displaced, in which the end face 29 of the sleeve 16 bears against the shoulder 40 serving as a stop.
  • the piston 32 guided in the second working cylinder 34 is relieved of pressure accordingly.
  • the housing 14 is additionally provided with a relief channel 70 in the wall of the housing 14, which runs at a small distance from the connecting channel 60 and via a recess 72, which in the second cylinder 34 facing end portion of the sleeve 16 is attached to the channel 60 is connectable.
  • the recess 72 is arranged relative to the two channels 60 and 70 such that when the sleeve 16 is in a position in which the outlet channel 58 and the connecting channel 60 are in alignment with one another, that is to say in the position according to FIGS.
  • the Recess 72 outside the opening area of the connecting duct 60 is located on the inner lateral surface of the bore 15, so that no plastic material flowing out of the outlet duct 58 can flow into the recess 72 and from there into the relief duct 70 adjoining it.
  • This configuration takes into account the fact that at least the section of the connecting channel 74 facing the housing 14 - like the injection molding cylinder 11 - is heated, so that the plastic material therein also maintains its plastic state during the cooling of the cavity (s) in the mold (s). 76, located plastic material. Since this plastic plastic material located in the channels 60 and 74 is under a certain excess pressure due to the previous pressure, it should be expected that when the finished article is removed from the mold cavity (s) 76, the one in the channels 60 and 74 located plastic expands and enters the mold cavity from the channels. This would make it necessary to clean the mold cavity before each injection process, since otherwise the quality of the articles to be manufactured in the mold nests would have to be feared.
  • the presence of the relief channel 70 results after the sleeve 16 has been moved into the position according to FIG 1 or that of FIGS. 2B and 2C show a pressure relief and, if appropriate, an expansion of this plastic material into the relief channel 70, so that expansion into the mold cavity is avoided.
  • FIG. 3 shows two units I and II, each with a spray reservoir 111 and a downstream injection molding tool 112, which are preceded by a common plasticizing unit 110 in the form of a screw extruder 148. Since the parts otherwise correspond to those of the exemplary embodiment according to FIGS. 1 and 2A-2C, parts are also provided with the same reference numerals, which, however, are 100 higher in FIG. 3.
  • the two storage spaces 127 are alternately fed through the extruder 148, the screw 149 of which is axially displaceably mounted in a known manner, so that in the course of the plasticization, a supply is provided in front of the end of the screw 149 facing the distributor 178 of plastic collects material which, as soon as a sufficient volume is reached, is ejected into the storage 127 to be filled by an axial movement of the screw 149.
  • the screw 149 of which is axially displaceably mounted in a known manner, so that in the course of the plasticization, a supply is provided in front of the end of the screw 149 facing the distributor 178 of plastic collects material which, as soon as a sufficient volume is reached, is ejected into the storage 127 to be filled by an axial movement of the screw 149.
  • the ejection piston 118 of the unit I is moved to the left in order to first shift the sleeve 116 into its other end position, in which the two channels 158 and 160 are aligned with one another, whereupon the displacement of the material from the storage space 156 in the direction of the injection mold 112 in the unit I he follows.
  • the storage of the extruder 148 is filled again while the screw 149 is axially moved back, so that in the next operation the storage is filled 127 of the injection molding cylinder of unit II can be filled by axially displacing the pusher screw after the sleeve 116 of this unit had previously been displaced into the left end position in order to interrupt the connection of the two channels 158 and 160.
  • the performance of the plasticizing unit 110, on the one hand, and the time required for injecting the plastic material into the injection molds 112, cooling and solidifying the plastic material located in the mold nests 176 and opening and closing the injection mold 112, on the other hand, can be coordinated with one another in such a way that the plasticizing is ⁇ is continuously in operation, ie, the screw 149 runs continuously, the filling of the memories 127 being arranged in time in the overall cycle in such a way that after the end of the reprint phase and the possible removal of the articles produced in the previous work cycle from the Injection molding tool 112 and the closing thereof, the injection molding can be done by emptying the respective storage space 127.
  • the two units I and II are alternately fed by the common plasticizing unit 110. It is of course also possible to assign more than two units consisting of injection molding cylinder and injection mold to one plasticizing unit 110.
  • FIGS. 4A and 4B is correct in all len parts with those of the embodiment of FIGS. 1 and 2A-2D agree with the exception of the design of the sleeve and the receiving bore in the area in which the sleeve and outer surface of the bore cooperate to form a closure. Therefore, in FIGS. 4A and 4B, all parts which correspond to the parts of the exemplary embodiment according to FIGS. 1 and 12A-2D are provided with the same, but by 200 higher reference numerals.
  • the essentially conical transition surface 286 in the casing surface delimiting the bore 215 is designed as a valve seat, the valve body of which cooperates with it is formed by the thickened end section 238 of the sleeve 216. 1 and 2A-2D, however, the outside diameter of the thickened end section 238 is markedly larger than the inside diameter of the bore 215 in its area of smaller diameter, which extends from the end face 242 of the sleeve 216 up to the transition surface 286 extends. This has the consequence that when the sleeve 216 assumes its end position shown in FIG.
  • the transition surface 288 of the sleeve 216 rests on the transition surface 286 of the bore 215 and so forms the closure.
  • the arrangement is also expediently such that the two transition surfaces 286 and 288 run essentially parallel to one another. This is advantageous not least in view of the fact that a considerable pressure acts on the sleeve 216 during the emptying process, which can be 1000 bar and more. It is obvious that the sleeve 216 is pressed with a correspondingly large force against the transition surface 286 serving as a valve seat and this is accordingly pressurized.
  • the contact area between sleeve 216 and the valve seat should be as large as possible, so as to keep the surface pressure in the usual limits for the components of the injection cylinder within permissible limits.
  • the annular gap 254 between the housing 214 and the sleeve 216 is as in the case of the embodiment according to FIGS. 1-3.
  • the sleeve 16 Due to the already mentioned high pressure during the injection molding process, that is to say the emptying of the storage space, the sleeve 16, also its thickened end section 38, which represents the free end of the sleeve, undergoes a certain expansion, which leads to the outer lateral surface of the thickened end portion of the sleeve 16 to the outside and thus in the area in which the closure is formed, is pressed against the lateral surface of the smaller diameter of the bore 15, as a result of which a tight closure is formed in any case. Tolerances with regard to the fit, if these do not exceed a certain size, are compensated for by the aforementioned expansion of the sleeve.
  • the widened part of the sleeve is resiliently resetted, so that there is then again as much play between the outer lateral surface of the thickened end section 38 and the lateral surface of the bore that the sleeve can be moved axially without difficulty.
  • the device according to the invention can be used for the production of finished products, but also for the production of intermediate products.
  • the latter can, for example, be preforms from which a blow molded product can be used to produce a final product, e.g. B. a bottle is made.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne une presse d'injection pour traiter des matières thermoplastiques, qui comprend au moins une unité de plastification (10), au moins un cylindre de moulage par injection (11) pourvu d'un piston de décharge (18) associé, ainsi qu'au moins un moule approprié (12). Le cylindre de moulage par injection (11) comporte un manchon (16) qui peut être déplacé en va-et-vient entre une position dans laquelle la communication avec le moule est interrompue, et une position dans laquelle la communication avec le moule est établie. Dans la position où la communication avec le moule est interrompue, il existe un passage entre le manchon (16) et le boîtier (14), qui est relié d'une part au canal d'alimentation (46) provenant de l'unité de plastification (10) et d'autre part à la chambre de stockage (27) délimitée à l'intérieur par le manchon. Le diamètre extérieur du piston de décharge (18) est légèrement inférieur au diamètre intérieur du manchon (16), de manière à ce qu'il subsiste entre les deux une fente annulaire que la matière plastique puisse traverser pour passer d'une extrémité (28) du manchon (16) dans la chambre de stockage (27).
EP96919539A 1995-05-10 1996-05-08 Presse d'injection pour traiter des matieres thermoplastiques Withdrawn EP0769998A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19517009A DE19517009A1 (de) 1995-05-10 1995-05-10 Spritzgießmaschine zur Verarbeitung thermoplastischer Kunststoffe
DE19517009 1995-05-10
PCT/DE1996/000847 WO1996035568A1 (fr) 1995-05-10 1996-05-08 Presse d'injection pour traiter des matieres thermoplastiques

Publications (1)

Publication Number Publication Date
EP0769998A1 true EP0769998A1 (fr) 1997-05-02

Family

ID=7761471

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96919539A Withdrawn EP0769998A1 (fr) 1995-05-10 1996-05-08 Presse d'injection pour traiter des matieres thermoplastiques

Country Status (6)

Country Link
US (1) US5814358A (fr)
EP (1) EP0769998A1 (fr)
JP (1) JPH10502886A (fr)
CA (1) CA2194402A1 (fr)
DE (1) DE19517009A1 (fr)
WO (1) WO1996035568A1 (fr)

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AT408087B (de) * 1999-03-02 2001-08-27 Engel Gmbh Maschbau Einrichtung zum herstellen von gegenständen aus thermoplastischem kunststoff
US6649094B1 (en) * 1999-06-18 2003-11-18 Husky Injection Molding Systems, Ltd. Method of purging shooting pot and providing enhanced purge capability
FR2797211B1 (fr) * 1999-08-06 2002-07-26 Ecia Equip Composants Ind Auto Installation de fabrication de pieces de structure en matiere thermoplastique, par exemple pour vehicules automobiles
US6527539B1 (en) 2000-10-25 2003-03-04 Husky Injection Molding Systems, Ltd. Injection unit of an injection system
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DE19517009A1 (de) 1996-11-14
WO1996035568A1 (fr) 1996-11-14
JPH10502886A (ja) 1998-03-17
US5814358A (en) 1998-09-29
CA2194402A1 (fr) 1996-11-14

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