DE1884762U - DEVICE FOR MANUFACTURING HOLLOW BODIES FROM THERMOPLASTIC PLASTICS. - Google Patents

Description

RA. G15 503 * 21 BM ■?

PATENT Attorney DIPL-ING. QUARQUOTS .J)

COLOGNE / RHINE

HOHENZOLLERNRING 2-10 (CONCORDIAHAUS) - TELEPHONE. 212593

COLOGNE,

F 15 995 / 39a Gm

? tiv> »! &: This L'nrenoga (Be; hersibung and Sihuijoi-ιερ, ·) is! submitted to Zulefzl. s% «calibrate! / ot »der je»: »iVi cisr tr? t * 0r! oHcU singareiciVcn 'J ^r -'- y \ ayiri r.'j. JV ₁ . r ·: h- "c: io r'-dsuSiinf; eier Λ ^ι ·· *» · ^ ;; ι ^: »: ^: =;. * VUit -Mi * '' - ff.

· ■ «. * vi SL- -i * yUücnes ^ «STii Qsiiifori. 'C * u; st! .E »P.i ^ r.Jcffif, (sjkm. ·

Armaturenfabrlk Johann Fischer, Lohmar (District Cologne)

Device for producing hollow bodies from thermoplastics

The invention relates to devices for the production of hollow bodies from plastics »such as bottles and the like, in which a hose is ejected from the nozzle of an extruder and after cutting a certain length into a two-part mold is inflated using a blow nozzle serving as a mold core for the bottle neck «

- 2nd

Postal checking account: ΚδΙη 43389 ■ Bank account: Kreissparkasse Siegburg 9790. Deutsche Bank Cologne 237957

- 2nd

In known devices, the hose piece is placed directly in a form arranged under the spray nozzle brought »this closed and the piece of hose in the mold from the one in the spray nozzle Part separated "A continuous mode of operation is not possible here." Therefore, it has also been suggested that the shape after capturing the hose piece, faster than the hose is ejected to move downwards, to open after the molding of the product and then afterwards Upward movement to capture a newly ejected cunning piece »In this way of working, you have to however, relatively large masses (forms) are constantly moved back and forth.

There is also a device known * in which the blow mold is arranged laterally next to the extrusion head and a reciprocating knife is provided, which separates pieces * from the hose ejected from the spray nozzle the upper end of which presses against a clamping jaw and is held in this way and transported into the laterally arranged form * In this case known device, however, the unobstructed exit of the hose is not necessarily guaranteed »

The shortcomings and difficulties of the known machines are intended to be remedied by the invention »The invention provides for this purpose in a device for producing

Hollow bodies made of thermoplastic material, such as bottles and the like, with an extruder, a spray nozzle for Ejection of a hose and a measured piece of hose separating and into the side of the spray head Porm transporting gripping device before »that the gripping device is provided with a control device that enables it to accelerate or decelerate (sinusoidal) Can run movement at which the speed in front of the spray nozzle a maximum and when reaching the Form is equal to full * To control such a gripper movement a crank mechanism can be provided in a simple manner. You can also assign two or more pairs to each other Provide shapes and corresponding, crossing gripper tracks and the grippers all by means of crank mechanisms control your movement »

The invention also aims to provide a special design for the blower nozzle and the use of a special one Blow-molding processes prevent any burrs that may be formed as a result of the form fit from not being directly in the neck opening but appears on the outside diameter of the bottle neck This is necessary for the complete closure of the hollow body when using suitable closure inserts from essential importance Neck opening of the hollow body to be produced, such as a

4 -

Bottle, there is no unconditional dependency, and that the hose has a smaller or larger diameter than the neck opening of the bottle can have, and that the nozzle has a much larger diameter than the one injected Can have hose * The invention provides for this purpose in a gate direction for the production of bottles or the like hollow bodies made of thermoplastic material with a two-part or multi-part shape in which with the help An extruder and a spray nozzle produced hose sections via a blow nozzle, which is used as a mold core for the bottle neck serves to be inflated before that the nozzle, which is provided with a control, which it after closing the shape is inserted into the piece of tubing surrounded by it, has a diameter that is larger than the inner diameter of the tube piece surrounded by the bottle neck shape, so that this is pressed when inserting the mandrel with a certain expansion against the mold wall, the The mandrel slides on the inner wall of the hose and smooths it. One provided on the blower nozzle in the radial direction protruding, ring-shaped collar, the diameter of which is greater than the clear width of the bottle neck shape, is used for processing the face of the bottle neck and in connection with at the level of the outer circumference of the bottle neck Squeezing edges provided on the mold to squeeze off the excess material

the squeezing occurs, is moved to the outer circumference of the bottle neck and does not interfere with the closure of the Neck opening »

In such a device, a control device for the blown air supply can also be provided, which allows air to escape from the nozzle opening before the blow nozzle penetrates the hose opening. Such a measure has the purpose of the tube protruding from the mold in a funnel shape to an outside of the mold Flange this beading collar so that the hose is not taken along by the nozzle when it is inserted can be·

Pie invention allows manifold implementation possibilities. In the drawing, as examples of some possible embodiments illustrated _t namely zeigtί

Fig, 1 is a front view of a gripping device with a crank drive in an operating state in which the from The hose section extended from the spray nozzle is just gripped by the gripping device in order to move it to the right Transport form,

FIG. 2 shows a front view of the gripping device according to FIG. 1, in which the operating state is shown in FIG which the piece of hose grasped by the gripping device is placed in the right-hand mold,

Pig »3 is a plan view of the device according to FIG. 1,

Pig »4 a schematic representation of the speed course of the gripping device on its way from the one shape past the spray nozzle to the opposite shape,

Fig # 5 shows a vertical cross section through the blow nozzle and the calibration part of the mold,

Fig. 6 shows the open blow mold in the receiving position with the hose extended to the required length thermoplastic plastic,

7 shows the blow mold in the closed state,

8 shows the start of the blowing process,

9 shows the blow mold with the blow nozzle retracted,

Fig. 10 shows an arrangement in which the hose a has a smaller diameter than the neck opening of the bottle to be produced,

Fig. 11 shows an arrangement in which the hose has a has a larger diameter than the neck opening of the bottle to be produced,

Fig * 12 shows an arrangement in which the hose has a considerably smaller diameter than the blower nozzle *

The gripping device "consists of the exiting Hose 1 detecting fork 2 and the linkage 3, which is in the on the molds 4 »4a attached holders 5 horizontally displaceable The linkage 3 is driven via the lever 7 mounted in point 6, its linkage remote end 7a is articulated to the crank wheel 8 via the connecting rod 9. In the state of motion shown in Pig * 1 if the crank wheel is in the middle position »so that the speed of the movement transmitted via the linkage is in front of the spray nozzle 10 is the largest, and thus the hose can be disconnected in the shortest possible time continuous ejection of the hose is therefore not necessary.

In Pig «2 the right end position is shown» in which the crank wheel is in the left cotlage, whereby the speed of movement of the gripper dropped to JTuIL is * At this moment the gripper with the hose 1 just reached the right porm 4a, which receives the tube »Meanwhile, the inflation of the left porm 4 located hollow body 11 ended, so that after ejecting this hollow body, the Porm 4 for the continuing to emerge Hose section has become receptive * The speed of the entire work process is determined on the one hand by the exit speed of the hose from the spray nozzle in Connection with the speed of the crank and on the other hand by the required dwell time of the hose in the porm up

for inflating and cooling it to form a hollow body * But since there is a lot of leeway with regard to the speed of the crank wheel and also the exit of the hose can be done relatively quickly, the operating speed of the entire device is essentially by determines the time required for the inflation process »

To shorten the inflation time, a so-called Purge air worked and a special blower nozzle 12 used, the most important cables of which can be seen in FIG As can be seen from the drawing, the blow nozzle serves with its shaft as a mold core for the bottle neck and penetrates into the hose opening, with the hose turn after printed on the outside against the mold wall and the excess material when the nozzle head 18 hits the mold is squeezed * It has a relatively large inlet channel 13 in its interior, which at the tip of the nozzle in a vertically and a horizontally directed channel 14 or * 15 smaller cross-section runs out * within the Nozzle channel is a Eohr 16 used, which with a Another horizontal bore located above the bore 15 in the nozzle tip is connected »Through these channels the air blown in via the channels 13, 14, 15 escapes after a certain overpressure has been reached and is over the channels 20, 21 installed in the nozzle head 18 and the nozzle holder 19 are carried away laterally, and are designed as screw connections, connected to the compressed air line

The nozzle holder 19 also has a bore 22 which communicates with the interior 13 of the nozzle via the bore 23 stands »By simultaneously blowing in the cold air vertically and horizontally, in connection with the extraction of the heated air creates a significant turbulence within the Hollow body and thus an effective cooling of the inner walls of the hollow body achieved, which together with the cooling of the Outer walls of the mold a rapid solidification of the hollow body and a correspondingly high output rate of finished hollow bodies guaranteed.

6 through 9 show the operation of an apparatus operating in accordance with the teachings of the invention in various ways Work stages · The hose piece 25 made of thermoplastic material ejected from the spray nozzle 24 of a screw press is grasped by the gripping device 27 at the moment in which it has the greatest speed, so that the hose is instantly removed from the nozzle and transported to the mold 26. The further exit of the mass from the spray nozzle is not hindered in any way of the gripping carriage that the transferred hose piece 25 in completely calm position in the position in the middle of the two-part mold 26 comes to a standstill »The mold closes now around the inserted hose (see * Fig * 7) and pinches it on the side facing the spray head while the opposite side, on which later the neck of the

- 10 -

10 -

"Bottle is formed, open" remains, At the same time, the underneath The air nozzle 28 located on the open cable of the hose is acted upon by air * 2) it exits from the air nozzle The air flow now causes that protruding from the nozzle to widen Hose piece and a collar-like beading of the same (cf. «Pig · 8) * Only now is the blow nozzle 28 in the opening inserted after the hose was calibrated in Neck part 30 of the mold is already so tight that it is no longer to be feared that it will be entrained by the entering nozzle (see Fig. 9) · After the nozzle has been inserted into the neck part the bottle to be formed, the pressure is increased until a valve opens in the second channel of the blow nozzle, through which the heated air flows off »The air is therefore constantly circulated and renewed in the interior of the hollow body, so that very rapid cooling takes place »

This way of working, in which the tube protruding from the mold is widened by a stream of air emanating from a nozzle located outside the mold, makes it possible to select the inner tube diameter independently of the diameter of the blow nozzle, because yes Before the introduction of the blowing nozzle by the Yorblase process, it is widened to the neck diameter of the mold. This application of the method, for example, is shown in FIG but is also an arrangement

- 11 -

11 -

tion according to Pig «11 possible, in which the diameter of the Hose 33 is much larger than the diameter of the mold opening 34 and the blow nozzle 35 "Finally, from Fig. 12 a device can be seen in which the differences in the diameter of hose 36 and spray nozzle 37 are particularly large * Due to the air flow emerging from the blower nozzle, the hose end is widened so far that the nozzle can enter this because the collar formation effectively prevents the material from being carried along *

The mode of operation with a gate direction according to Pig * 10 has the advantage that a material pinch in the area of the thread the bottle neck is avoided, so that any burr formation within this thread is omitted and a perfect formation of the thread turns is guaranteed * On the other hand, is suitable a molding device according to FIG. 12 especially for the production of wide-necked vessels in the mold, the possibility being given is to run in a tube as a preform, which is smaller in diameter than the diameter of the blow nozzle » The arrangement has the advantage that any pinching in the thread « area as well as the formation of burrs on the thread possibly attached to the neck area is avoided normal in the floor area and it can be any according to the requirements Wall thickness can be achieved. The ¥ / ar in the previously common processes for the production of wide-necked vessels in the Form, in which a preform is moved over the blow nozzle and then the form fit and the blow molding process take place, not

- 12 -

- 12 ~

possible because the diameter of the hose is to be chosen to be relatively large so that it is passed over the blow nozzle can be and consequently no more significant expansion takes place in the blowing process. This fact affects the The entire shape, in particular the wall thickness, is disadvantageous. Furthermore, there is an excessively large pinch in the floor part of the wide-necked vessel and inevitably also a pinching of the neck opening »which is undesirable when inserting threads Results in burr formation *

However, these disadvantages become apparent when the method according to the invention is carried out using a mold according to Fig. 12 avoided »

Claims (2)

- 13 - Protection claims 1 _# Device for the production of hollow bodies made of thermoplastic material, such as hashes and the like, with an extruder, a spray nozzle for ejecting a hose and a gripper device which separates measured pieces of hose and transports it into the mold located on the side of the spray head, characterized in that the gripper device with a Control device is provided, which allows it to execute an accelerated or delayed (sinusoidal) movement, in which the speed in front of the spray nozzle is a maximum and when the shape is reached is equal to HuIl. 2. Device according to claim 1, characterized in that that a crank mechanism is provided to control the gripper device » 3 * Device according to claim 1 or 2, characterized in that two or more pairs of mutually associated shapes and corresponding, crossing gripper jaws are provided, 4 · Device for the production of bottles or similar hollow bodies made of thermoplastic material with a two-part or multi-part form, in which with the help of a 7 / - 14 - Extruders and a spray nozzle produced hose sections via a blow nozzle, which acts as a mold core for the bottle neck is used to be inflated, characterized by a after closing the mold in the piece of tubing surrounded by the mold insertable blower nozzle, the diameter of which is greater than the inner diameter of that surrounded by the bottle neck shape Hose section is » 5 »Device according to claim 4» characterized by one provided on the blow nozzle, in the radial direction protruding ring-shaped collar, the diameter of which is larger than the clear width of the bottle neck shape » 6 »Device according to claim 5, characterized in that the annular collar as a squeeze surface with on the Height of the outside of the bottle neck on the mold Pinch edges cooperate, 7 «Device according to one or more of claims 4 to 6, characterized by a control device for the Blown air supply, which allows blown air to escape from the nozzle opening before the blower nozzle enters the hose opening * 8, device according to one or more of claims 4 to 7, characterized in that the hose diameter is smaller than the neck opening of the hollow body » - 15 ~ 15 ~ 9. Device according to one or more of claims 4 to 7> characterized in that the tube diameter is larger than the neck opening of the hollow body _# 10 »Device according to one or more of claims 4 to 7» characterized in that the hose diameter is smaller than the diameter of the air nozzle *