WO1981002133A1 - Dispositif pour la preparation d'une paraison et son transfert a une machine de moulage - Google Patents

Dispositif pour la preparation d'une paraison et son transfert a une machine de moulage Download PDF

Info

Publication number
WO1981002133A1
WO1981002133A1 PCT/US1980/001750 US8001750W WO8102133A1 WO 1981002133 A1 WO1981002133 A1 WO 1981002133A1 US 8001750 W US8001750 W US 8001750W WO 8102133 A1 WO8102133 A1 WO 8102133A1
Authority
WO
WIPO (PCT)
Prior art keywords
parison
location
extrusion head
extrusion
stretcher
Prior art date
Application number
PCT/US1980/001750
Other languages
English (en)
Inventor
P Schurman
Original Assignee
Plastic Forming Co
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 Plastic Forming Co filed Critical Plastic Forming Co
Priority to JP81500841A priority Critical patent/JPS57500016A/ja
Publication of WO1981002133A1 publication Critical patent/WO1981002133A1/fr

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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/28—Blow-moulding apparatus
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/14—Clamps
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding

Definitions

  • the present invention relates to apparatus for 5 preparing a tubular parison that s continuously, down ⁇ wardly extruded from an extrusion head and for trans- : . ferring sections of the parison to a blow molding machine to be formed into ar.ticles.
  • Processes are known for blow molding articles 10 from, for example, molten thermoplastic materials that are downwardly extruded as a tubular pariso " n from an e-xtrusion head.
  • the parison is divided into discreet sections that are sealed at opposite ends to confine therein a volume of air at pressure slightly 15 above atmospheric pressure. This- slightly pressurized air prevents the side walls' of the parison from collapsing into contact with each other.
  • Each parison section is then clamped between mating die members in a blow molding machine and air at higher ' pressure is' injected into its 20 interior to expand it against the faces of mold cavities, defining the external shape of the article being made, formed in the mating die members.
  • thermoplastic material expands or swells af er passing through, an extrusion head under pressure.
  • thermoplastic material expands or swells af er passing through, an extrusion head under pressure.
  • the thermoplastic material moves downwardly pushed by other material from the head and pulled by gravity.
  • the material first ex ⁇ truded from the head is subject to longitudinal con- traction through cooling and elastic recovery at an earlier time than subsequently extruded material.
  • Apparatus in accordance with, one such proposal includes a molding machine having a plurality of mating die members"that are serially moved into position to receive an extruded parison section. While one parison section is molded into an article between mating die members, a second parison section continues to be extruded from the ex ⁇ trusion apparatus.. The second section is then molded while the first molded article is stripped from, for example, the first mating die members which are there- after again ready to receive another extruded parison section.
  • Another proposal involves mounting the molding machine'to move into the proximity of the extrusion apparatus to receive an extruded parison section. Once the mating die members are closed about the parison section, the molding apparatus is moved to a position remote from the extrusion apparatus where the molding process is completed and while a second parison section continues to be extruded.
  • the apparatus of the present invention prepares a parison that is continuously extruded from an extrusion head and transfers sections of the parison to a blow molding machine. Specifically, this apparatus controls the wall thickness of the parison so that it may be molded into articles having various sizes and shapes.
  • This apparatus is particularly well adapted to prepare a parison for molding unusually large articles such as, for example, guitar cases out of thermoplastic materials.
  • the apparatus also transfers parison sections out of the vicinity of the extrusion head so that the continuous extrusion process is not interrupted. Each parison section is ultimately transferred to a molding machine which may be adapted to receive unusually long parison sections.
  • the apparatus of the present invention is light in weight, relatively umcomplicated, and reliable in operation.
  • the apparatus includes a parison stretching mechanism that cyclically operates to first, while in a parison receiving position, grasp and seal the parison at one location along its length. While it is extruded, the parison is then
  • the apparatus further includes a parison transfer mechanism that is cyclically operable to first, while in a parison accepting position spaced farther from extrusion head than is the parison receiv- ing position, grasp and seal the parison at a second location on its length intermediate the one location and the extrusion head to thereby define a parison section.
  • the transfer mechanism grasps and seals the parison at the parison accepting position and then severs the parison section from the remainder of the parison by transferring the section transversely away from the stretching mechanism and the extrusion head.
  • the transfer mechanism subsequently delivers the parison section downwardly in a direction generally parallel to the downward extrusion of the parison to the molding machine and then returns to the parison accepting position.
  • the apparatus of the invention provides many advantages because it first transfers parison sections horizontally away from the extrusion head and stretching mechanism and then vertically lowers the parison sec ⁇ tions to a stationary molding machine. Therefore, complex and heavy equipment for transferring the molding machine into and out of the vicinity of the extrusion head is eliminated.
  • the transfer mechanism is light, efficient, requires less complex motive equipment and, therefore, uses less energy and requires less mainte- nance than does equipment for moving a molding machine.
  • the transfer mechanism is capable " of more rapid movement than is the molding machine and safety shielding may be provided more easily for the transfer mechanism than for movable molding apparatus.
  • the apparatus of the present invention provides compound movement of the parison section, first in a horizontal and then in a vertical direction, longer parison sections may be molded.
  • movable molding machines have two tie bars, positioned at diagonally opposed corners of platens that carry the die members for movement toward and away from each other. If horizontal motion only of the parison section to the machine is provided, it is necessary that the bottom of the parison section be initially positioned high enough to clear the lower front tie bar in order to pass properly between the mating die members.
  • the parison section is transferred downwardly by the apparatus of the invention, longer parisons may be molded conveniently without difficulty of passing the lower end of the parison over the lower front tie bar.
  • the apparatus of the invention efficiently uses space.
  • the stretching mechanism of the apparatus of the invention also provides precise control of wall thickness of each parison section determined by the rate at which it moves from the parison receiving to the remote location.
  • parison wall thickness at the extrusion die will be made sufficiently large so that the stretching mechanism may always stretch the parison to varying degrees, even when the stretching mechanism descends at a relatively slow speed.
  • the stretching mechanism may be used to support the parison against gravity when the mech ⁇ anism either descends at a very slow speed or is JUREATT
  • the parison section is removed from the proximity of the extrusion head and the path of further extrusion of the remainder of he parison permitting the extrusion process to continue without interruption.
  • FIG. 1 is a perspective view, partly broken away to show detail of the apparatus of the present invention for preparing a parison section and transfer ⁇ ring it to a molding machine.
  • FIG. 2 is a right side elevational view of the apparatus shown in FIG. 1.
  • FIG. 3 is a rear elevational view of the apparatus.
  • FIG. 4 is a front elevational view of the apparatus.
  • FIG. 5 is a top plan view of the parison stretching mechanism, which includes a pair of recip- rocally mounted stretcher jaws.
  • FIG. 6 is a vertical cross-sectional view taken through plane 6-6 in FIG. 5.
  • FIG. 7 is a top plan view of the parison transfer mechanism which includes two relatively recip- rocally movable transfer jaws.
  • FIG. 8 is a vertical cross-sectional view taken through plane 8-8 in FIG. 7 of the transfer mechanism.
  • FIG. 9 is an enlarged side elevational view of a portion of the parison transfer mechanism that controls both horizontal and vertical movement of the parison.
  • FIG. 10 is a vertical cross-sectional view taken through plane 10-10 in FIG. 9.
  • FIGS. 11A through HE are diagrammatic repre-' sentations of the apparatus of the present invention at various stages of the cyclical operation.
  • FIG. 12 is a timing diagram of operation of the various interrelated mechanisms of the apparatus of the present invention.
  • the apparatus of the present invention for • preparing a parison that is continuously, downwardly extruded from an extrusion head and for transferring sections of the parison to a molding machine is general ⁇ ly indicated at 10 in FIGS. 1 through 4.
  • the molding machine with which this apparatus is used is generally indicated at 12 and is mounted in a stationary position on the same support as is the apparatus.
  • the support may, for example, be a floor or platform at any desired location.
  • the molding machine 12 includes two tie bars 14 that carry two large platens 16 for reciprocal movement toward and away from each other under motive power supplied by mechanisms (not shown) , which may be, for example, pressurized fluid driven piston and cylinder assemblies or mechanical crank mechanisms.
  • the tie bars pass through diagonally opposed corners of the platens, the bar closest to apparatus 10 being positioned at a level lower than that farthest away from the apparatus.
  • Each platen carries a mold member or die 18 formed with a mold cavity 20.
  • the respective cavities formed in the mating dies together define the exterior c nfiguration of an article to be molded.
  • the mold members are closed about it, with it disposed within the mating mold cavities, by reciproca ⁇ tion of the platens. Fluid, usually air, under pressure is injected into the interior of the parison to force the parison walls outwardly into intimate, conforming contact with the surface of the mold cavities to thereby form the desired article.
  • the apparatus 10 of the invention includes a frame, generally indicated at 22, that comprises four vertically arranged, mutually parallel columns 24, adjacent ones of which are interconnected by horizontal ⁇ ly extending, upper and lower support struts 26 and 28 respectively. Diagonally arranged support struts may be used to interconnect adjacent columns for further rigidity of the frame if desired.
  • an extrusion head 30 is positioned within the upper region of the frame defined between the columns ⁇ and communicates with an extrusion machine generally indicated at 32.
  • the extrusion machine is conventional and supplies
  • the head includes a ring die from which a cylindrical, parison of the molten thermoplastic material is continuously, downwardly extruded, under influence of pressure devel ⁇ oped by the extrusion machine, within the interior of the frame.
  • the extrusion head can be supported by suitable members within the frame.
  • a fluid usually air, is supplied to the interior of the parison at low pressure to prevent the parison wall from collapsing onto itself.
  • the apparatus 10 of the invention further includes a mechanism for preparing the parison by stretching it at a controlled rate as it is extruded from the extrusion head to insure uniform parison wall thickness.
  • the apparatus 10 further includes a transfer mechanism for severing a section of the parison from the remainder thereof after its prepara- tion by the stretching mechanism and transferring it first horizontally and then downwardly and vertically to a position between the open mating die members of the molding machine. Both the parison stretching and parison transferring mechanisms are described below in detail.
  • the parison stretching mechanism shown generally in FIGS. 1 through 4 and shown in greater detail in FIGS. 5 and 6, is generally indicated at 40.
  • This mechanism includes a stretcher jaw assembly 42 that comprises a horizontal mounting plate 44 (FIG. 6) which is supported for vertical reciprocal movement on three cylindrical guide bars 46 (FIGS. 3 through 6).
  • the guide bars are mounted to extend in mutually par- allel vertical relation between a horizontal base plate 48 secured to the frame at its lower end and a
  • the mounting plate 44 is provided with three antifriction bushings 52 that embrace the guide bars and facilitate the vertical reciprocal movement.
  • a jack screw 54 is journalled for rotation betwee the frame base plate 48 and frame top plate -50 in antifriction bearings, a lower one 56 of which is mounted in the base plate and an upper one 58 of which is mounted in a U-shaped bracket 60 that is secured to the top plate 50.
  • a traveling nut 62 is fixed in non-rotative relation to the stretcher jaw assembly mounting plate 44 and the jack screw 54 is threaded through it.
  • the mounting plate moves upwardly or downwardly, depending on the direction of rotation of the screw, guided on the guide bars 46 and maintained thereby in a stable horizontal attitude. (FIGS. 3, 4 and 6) .
  • a driven toothed pulley 64 is pinned to the jack screw 54 for rotation therewith at its lower end.
  • a direct current (D.C.) electric motor 66 is mounted on a mounting bracket 68 secured to one vertical column 24 of the frame and a toothed pinion 70 is carried on the lower end of the motor shaft 72.
  • a toothed belt 74 interconnects the pinion and the driven pulley 64 so that the motor may supply motive power to rotate the jack screw (FIGS. 3, 4 and 6).
  • the motor 66 is capable of different rotary speeds.
  • a series of sensors 75 is mounted on the frame, for example, on one of the columns 24 to be tripped by the stretcher jaw assembly mounting plate 44 as it moves upwardly or downwardly. These sensor8 are adjustibly positioned to actuate a speed control 77 for the motor to modify the rate of
  • the stretcher jaw assembly 42 further includes a pair of stretcher jaws 76 and 78 mounted for pivoted movement on the underside of the mounting plate 44.
  • a U-shaped yoke 80 depends from the lower surface of the mounting plate 44 at its rear edge. The yoke is formed with two pair of congruent upper and lower slots 82 and 84 which extend in the direction of the rear edge of the mounting plate 44.
  • each stretcher jaw 76 and 78 is provided with upper and lower pins 86 and 88 that are respectively engaged in upper and lower slots 82 and 84 in the yoke 80.
  • the stretcher jaws can be pivoted between a closed position shown in phantom lines and an open position shown in solid lines.
  • the slot pivot mounting arrangement of the stretcher jaws described above permits them to be separated by a larger distance in the open position for their given length than would be possible with a fixed pivot mounting arrangement. Accordingly, this stretcher jaw assembly is space efficient.
  • the stretcher jaws are further held in sliding contact with the lower surface of the mounting plate 44 by a forward U-shaped yoke 90.
  • the stretcher jaws are interconnected by a mechanism for moving them between the open and closed positions.
  • this mechanism is a pressurized fluid actuated piston and cylinder assembly 92, the cylinder 94 of which is attached for pivoted movement to one stretcher jaw 78 and the piston 96 of which is attached for pivoted movement to the
  • ends of the stretcher jaws project a substantial distance beyond the forward edge of the mounting plate 44.
  • the guide bars 46 are positioned within the frame to dispose the projecting ends of the stretcher jaws beneath the extrustion head.
  • the stretcher jaws may be closed about a lower end of the parison to grasp and seal it.
  • the jack screw may then be rotated by the motor 66 to move the stretcher jaw assembly downwardly and stretch the parison at a con- .rolled rate in order to prepare the parison for molding.
  • the apparatus 10 of the invention also in ⁇ cludes the mechanism for severing a prepared parison section from the remainder of the continuously extruded parison, transferring the section laterally away from the extrusion head and stretching mechanism, then vertically delivering it to the molding machine.
  • This transfer mechanism generally indicated at 100 in FIGS. 1, 2, 7 and 8, includes a transfer carriage, generally indicated at 102 that carries a transfer jaw assembly, generally indicated at 104.
  • the carriage in ⁇ cludes upper and lower horizontally oriented, U-shaped frame plates 106 and 108 that are interconnec ed by vertically oriented side plates 110 and 112 to form a box-like structure open at horizontally opposite ends.
  • the transfer jaw assembly includes two transfer jaws 114 and 116, each of which is mounted for pivoted movement respectively about a pivot pin 118 and 120 carried respectively on a main pivot arm 122 and 124. Each main pivot arm is mounted for pivoted movement on the lower frame plate 108 respectively about pivot pins 126
  • the transfer jaw assembly further includes an arrangement for ensuring that the transfer jaws move toward and away from each other in constant, mutually parallel relation.
  • each transfer jaw 114 and 115 is formed with a triangular flange 132 and 134 projecting from its rear surface.
  • Stabilizing arms 136 and 138 are respectively secured for pivoted movement to a pivot pin 140 and 142 mounted on the triangular flanges 132 and 134 of the jaws.
  • Each stabilizing arm is, in turn, respectively secured for pivoted movement to a pivot pin 146 and 148 mounted on the lower frame plate 108 of the transfer carriage. The distances between the pivot points on each main pivot arm and between the pivot points on each stabilizing arm are equal.
  • each transfer jaw constitutes a parallel arm assembly for holding the transfer jaw in the desired attitude.
  • each transfer jaw is mounted for pivoted movement between an open position shown in solid lines in FIG. 7 and a closed position shown in phantom lines grasping and sealing the parison.
  • An actuator for example, in the form of a fluid actuated piston and cylinder assembly 150 interconnects the main pivot arms 122 and 124 of the parallel arm assembly to move the transfer jaws between the open and closed positions. Specifically, the piston of the piston and cylinder assembly is secured for pivoted movement to
  • the entire transfer carriage including the transfer jaw assembly is mounted for transverse horizon ⁇ tal movement away from and toward a parison accepting position in the vicinity of the extrusion head and for vertical movement at a position horizontally displaced from the extrusion head toward and away from a parison delivering position in the vicinity of the molding machine. As shown in FIGS.
  • the arrange ⁇ ment for providing this movement includes two horizon- ' - ⁇ lly extending, mutually parallel transfer side plates 152 and 154 each of which is secured, for example, by welding to two vertical columns 24 of the frame 22.
  • Each transfer plate has a transverse rail 156 that is mounted or formed on its inner face and which consti ⁇ tutes a transverse rail or track.
  • the side plates 110 and 112 of the transfer carriage ' each carry two followers or wheels 160 mounted for rotation on suitable bearings. The wheels are spaced apart by a significant distance and are positioned to be tracked in the respective transverse rails 156 and 158.
  • the transfer mechanism further includer four vertically depending parallel U-shaped channels or tracks 162 which are mounted on the projecting ends and depend from the transfer side plates 152 and 154.
  • a support block 164 is mounted for vertical, reciprocal, sliding movement in each vertical channel 162 between carriage receiving and carriage delivering positions. As shown in detail in FIGS. 9 and 10, each support block has a recess 166 formed therein that is congruent with and forms an extension of the transverse rails 156 and 158 when the support block is at its uppermost
  • the wheels on which the transfer carriage ride may be tracked along the transverse rails 156 and 158 into the recesses 166 formed in the support blocks 164.
  • the vertical channels 162 are mounted so that the sliding support blocks are spaced apart by a distance equal to that between the adjacent wheel ⁇ on one side of the transfer carriage.
  • the transfer carriage may be moved horizontally or trans ⁇ versely tracked by the transverse rails 156 and 158 until the forward-most wheels on the transfer carriage abut the stop bars 166. Thereafter the transfer car ⁇ riage may be moved downwardly by simultaneous downward movement of the sliding support blocks mounted in the vertical channels 162.
  • the apparatus of this present invention further includes an arrangement for ensuring that all sliding support blocks move downwardly in unison.
  • a chain 170 is attached to each forward- most sliding block 164 and a similar, but shorter chain 172 is attached to each rear-most sliding block.
  • Each chain 170 is reeved about forward sprocket 174 and a first rear, outer sprocket 176.
  • each shorter chain 172 is reeved about an intermediate sprocket 178 and a second rear, inner sprocket 180.
  • Each pair of rear sprockets 176 and 180 is mounted for rotation on a shaft 182 and each sprocket of the pair may be rotated independently of the other.
  • the two inner sprockets are, however, rigidly inter ⁇ connected by a shaft 182a to rotate in unison.
  • each of the shorter chains 172 is connected to an individual counterweight 184b.
  • the total weight of the counterweights is approximately equal to the total weight of the transfer mechanism 100, the weight of each counterweight being approximately equal to the weight of one quadrant of the transfer mechanism 100.
  • Each counterweight 184a is slotted at 185 to receive the bolt 187 rigidly attached to the other counterweight 184b in each pair of counterweights 184a and 184b.
  • the four counterweights with weight distribu ⁇ tion approximately that of the transfer mechanism 100, provide for uniform transmittal of force from the motive power supplying means, described in greater detail below.
  • shaft 182a will transmit motive force from one side to the other to overcome this resistance. If differential resistances exist between ends of the transfer mechanism, either the front or rear of the transfer carriage will move further on the vertical leg of transfer motion, causing the bolts 187 secured to the counterweights 184 to move to the extreme of the associated slot 185 in associated counterweight of 184a. At this time the full weight of both counterweights 184a and 184b will act to correct irregular movement.
  • Motive power for moving the transfer carriage transversely away from the extrusion head and stretcher jaw assembly and, subsequently, toward the molding machine in a vertical direction is provided by a pres ⁇ surized fluid actuated double-acting piston and cylinder assembly 183.
  • the piston 186 of the assembly is mounted for pivoted movement to pivot pin 188 in a
  • bracket 190 secured to the top frame plate 106 of the transfer carriage.
  • the cylinder 192 of the assembly is mounted for pivoted movement to a pivot point 194 mounted in parallel support arms 196 that span the distance between the upper vertical struts 26 of the frame 22.
  • the piston and cylinder assembly 184 is mounted at an oblique angle interconnecting its opposed mounting points on the transfer carriage and frame support arms respectively so that action driving the piston out of the cylinder moves the transfer carriage in the transverse direction and then in the vertical direction within the constraints of the horizontal rails 156 and vertical channels and support blocks 162 and 164. Similarly, retracting action of the piston into the cylinder reverses the movement of the transfer carriage.
  • the apparatus of the present invention operates to both stretch and prepare a parison and to sever and transfer parison sections to a molding machine in order. to provide the advantages noted above. Moreover, these actions are coordinated in a manner described below.
  • FIGS. 11A through HE are diagram ⁇ matic representations of the apparatus of the invention at various stages of its operation and FIG. 12 is a timing diagram of the operations performed by the piston stretching and transfer mechanisms.
  • the extrusion of the parison from the extrusion head 30 begins.
  • the stretcher jaw assembly is in the parison receiving position, the stretcher jaws are open, the transfer
  • the stretcher jaw assembly begins moving toward its remote position as shown in FIG. 12.
  • the stretcher jaws open. This situation is shown in FIG. 11B.
  • the stretcher jaw assembly returns to the parison receiving position.
  • the stretcher jaws move to the closed position about the extruded parison.
  • the transfer jaws also move to the closed position so that the parison is clamped at two closely spaced positions along its length. This situation may also be depicted in FIG. llC.
  • the transfer mechanism begins moving from its parison accepting position to its parison delivering position, first in a transverse direction. The transverse motion of the closed transfer jaws away from the closed stretcher jaws tears or severs the parison leaving the separated parison section suspended from the closed transfer jaws. As shown in FIG.
  • FIG. 11D shows the situation in which the parison stretcher assembly continues to stretch the extruded parison end and the parison transfer mechanism has been fully transported in a transverse direction.
  • time t g when the transfer mechanism has reached its parison delivering position shown in FIG.
  • the mold members close around the parison section.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

Dispositif (10) servant a preparer une paraison tubulaire, extradee en continu dans une direction d'extension par une tete (30) d'extension, et a transferer successivement la paraison a une machine (12) de moulage par soufflage. Le dispositif (10) permet un controle ameliore de l'epaisseur de la paroi de la paraison et peut etre utilise de maniere particulierement avantageuse dans la fabrication d'articles pour lesquels des paraisons d'un diametre et d'une longueur importante s'averent necessaires. Le dispositif (10) comprend un mecanisme (40) d'allongement de paraison qui saisit et ferme hermetiquement la paraison a un emplacement sur sa longueur et l'allonge a une vitesse controlee pendant qu'elle est extrudee dans la direction d'extrusion. Le dispositif (10) separe aussi sequentiellement des parties de la paraison de la partie restante extrudee en continu et transfere chaque partie a machine (12) a mouler par soufflage stationnaire en dehors du chemin de cette partie restante. Ces operations sont accomplies par un mecanisme (100) de transfert de paraison qui saisit et ferme hermetiquement la paraison a un deuxieme emplacement sur sa longueur situe entre le premier emplacement et la tete d'extrusion (30) de maniere a definir une section de paraison. La section est separee de la partie de paraison restante, transferee dans une direction transversale par rapport a la direction d'extension loin de la tete d'extension (30) et est par la suite amenee a la machine de moulage (12) dans une direction generalement parallele a la direction d'extrusion.
PCT/US1980/001750 1980-01-28 1980-12-29 Dispositif pour la preparation d'une paraison et son transfert a une machine de moulage WO1981002133A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP81500841A JPS57500016A (fr) 1980-01-28 1980-12-29

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/115,944 US4340345A (en) 1980-01-28 1980-01-28 Apparatus for preparing a parison and transferring it to a molding machine
US115944 1993-09-01

Publications (1)

Publication Number Publication Date
WO1981002133A1 true WO1981002133A1 (fr) 1981-08-06

Family

ID=22364297

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1980/001750 WO1981002133A1 (fr) 1980-01-28 1980-12-29 Dispositif pour la preparation d'une paraison et son transfert a une machine de moulage

Country Status (4)

Country Link
US (1) US4340345A (fr)
EP (1) EP0044865A1 (fr)
JP (1) JPS57500016A (fr)
WO (1) WO1981002133A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2990177A4 (fr) * 2013-04-24 2016-12-28 Toyo Seikan Group Holdings Ltd Dispositif d'introduction et procede d'introduction de paraison

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536146A (en) * 1984-11-16 1985-08-20 Hernandez Luis A Croquette machine
US4723906A (en) * 1986-06-02 1988-02-09 Cincinnati Milacron Inc. Blow molding apparatus
US4795023A (en) * 1986-06-02 1989-01-03 Cincinnati Milacron Inc. Blow molding apparatus
DE19922490C2 (de) * 1999-05-15 2001-06-28 Fischer W Mueller Blasformtech Verfahren und Vorrichtung zum Herstellen von hohlkörperförmigen Artikeln aus thermoplastischem Kunststoff durch Saugblasen
DE20020531U1 (de) * 2000-12-04 2001-04-05 Lin Kun Wang Vorrichtung zum synchronen Bewegen und Abdichten eines Formblasprodukts
FR2831483B1 (fr) * 2001-10-26 2004-01-09 Pechiney Emballage Flexible Eu Materiaux d'operculage ou opercules pelables multicouches

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3504396A (en) * 1966-07-08 1970-04-07 Grace W R & Co Apparatus for forming hollow articles
US3539670A (en) * 1968-03-29 1970-11-10 Hercules Inc Method of forming hollow plastic articles
US3596315A (en) * 1968-08-21 1971-08-03 Kureha Chemical Ind Co Ltd Apparatus for the continuous manufacture of thermoplastic resinous containers
US3699199A (en) * 1970-12-30 1972-10-17 Hercules Inc Continuous blow molding process with reduction of length compensation
US3795719A (en) * 1971-09-09 1974-03-05 Baychem Corp Method of controlling the blow molding of hollow shaped plastic articles
US4153408A (en) * 1976-05-25 1979-05-08 Hoechst Aktiengesellschaft Process for extrusion blowing of thermoplastic hollow articles and gripper device for drawing the parison into the blow mold
US4157235A (en) * 1976-07-30 1979-06-05 Pont-A-Mousson S.A. Device for modifying the thickness of a body extruded at a constant rate
US4233019A (en) * 1977-08-24 1980-11-11 Kureha Kagaku Kogyo Kabushiki Kaisha Apparatus for delivering parisons of preselected length and diameter

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3504396A (en) * 1966-07-08 1970-04-07 Grace W R & Co Apparatus for forming hollow articles
US3539670A (en) * 1968-03-29 1970-11-10 Hercules Inc Method of forming hollow plastic articles
US3596315A (en) * 1968-08-21 1971-08-03 Kureha Chemical Ind Co Ltd Apparatus for the continuous manufacture of thermoplastic resinous containers
US3699199A (en) * 1970-12-30 1972-10-17 Hercules Inc Continuous blow molding process with reduction of length compensation
US3795719A (en) * 1971-09-09 1974-03-05 Baychem Corp Method of controlling the blow molding of hollow shaped plastic articles
US4153408A (en) * 1976-05-25 1979-05-08 Hoechst Aktiengesellschaft Process for extrusion blowing of thermoplastic hollow articles and gripper device for drawing the parison into the blow mold
US4157235A (en) * 1976-07-30 1979-06-05 Pont-A-Mousson S.A. Device for modifying the thickness of a body extruded at a constant rate
US4233019A (en) * 1977-08-24 1980-11-11 Kureha Kagaku Kogyo Kabushiki Kaisha Apparatus for delivering parisons of preselected length and diameter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2990177A4 (fr) * 2013-04-24 2016-12-28 Toyo Seikan Group Holdings Ltd Dispositif d'introduction et procede d'introduction de paraison
US9636865B2 (en) 2013-04-24 2017-05-02 Toyo Seikan Group Holdings, Ltd. Parison supply device and supply method

Also Published As

Publication number Publication date
EP0044865A1 (fr) 1982-02-03
US4340345A (en) 1982-07-20
JPS57500016A (fr) 1982-01-07

Similar Documents

Publication Publication Date Title
US4212618A (en) Apparatus for the manufacture of transversely contoured tubing from thermoplastic material
US2975473A (en) Manufacture of hollow plastic articles
JP4641527B2 (ja) 中空成形装置
KR900007347B1 (ko) 합성수지의 중공성형장치
JPS6178616A (ja) プラスチツク材の成形体をつくり同時にチユーブ状体に接続する方法と装置
CA2240428A1 (fr) Appareil et methode de formage par pression differentielle, d'ebarbage et d'empilage
WO1981002133A1 (fr) Dispositif pour la preparation d'une paraison et son transfert a une machine de moulage
CN112776244B (zh) 人机协作的模具脱模生产线
JPS6360695B2 (fr)
CN203854173U (zh) 瓶坯剪尾机
CN115257050B (zh) 一种碳素阳极成型设备
CN108943555B (zh) 一种发泡板的发泡冷却取料自动化生产线
US4393023A (en) Method for preparing a parison and transferring it to a molding machine
US3613980A (en) Sheet advance apparatus
RU2186683C1 (ru) Экструзионно-раздувная формовочная машина
CN216070602U (zh) 同步夹持机构及吹灌封设备
US3776680A (en) Extruder movement
CN219044120U (zh) 一种吹塑机管坯移动装置
CN220576469U (zh) 一种贯流注塑塑料件一体化成型设备
CN211467434U (zh) 合模联动机构
CN218020079U (zh) 一种吹塑机
CN211807416U (zh) 双层管材的专用注塑机
CN2099663U (zh) 塑料中空成型机
CN220611915U (zh) 一种具有拉伸机构的金属模具
CN218905735U (zh) 一种刀具生产用注模装置

Legal Events

Date Code Title Description
AK Designated states

Designated state(s): BR JP

AL Designated countries for regional patents

Designated state(s): DE FR GB

WWE Wipo information: entry into national phase

Ref document number: 1981900590

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1981900590

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1981900590

Country of ref document: EP