WO2004062876A1 - Conveyor system comprising an accumulation conveyor, and method for producing moulded parts consisting of elastomers - Google Patents
Conveyor system comprising an accumulation conveyor, and method for producing moulded parts consisting of elastomers Download PDFInfo
- Publication number
- WO2004062876A1 WO2004062876A1 PCT/EP2003/014874 EP0314874W WO2004062876A1 WO 2004062876 A1 WO2004062876 A1 WO 2004062876A1 EP 0314874 W EP0314874 W EP 0314874W WO 2004062876 A1 WO2004062876 A1 WO 2004062876A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conveyor
- mold
- conveyor system
- mold carriers
- accumulation
- Prior art date
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/34—Moulds or cores; Details thereof or accessories therefor movable, e.g. to or from the moulding station
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/58—Moulds
Definitions
- the invention relates to the transport of mold carriers, in the molds of which molded parts are made from elastomers.
- the 5 mold carriers pass through an operating section on a closed conveyor line, in which they are cyclically transported from one operating station to the next. Then they are accumulated in a curing area.
- molded part is understood to mean a three-dimensionally shaped object made of elastomers.
- mold carrier is used in a simplified manner to describe the unit consisting of mold carrier, article-dependent mold or mold inserts and the molds to describe molded parts from the filling station to the emptying station.
- cycle line is to be understood as a route on which the mold carriers are moved with a certain frequency from operator station to operator station and stand still at the operator stations for a certain time.
- cycle line is also to be understood as a route on which the mold carriers are continuously moved, on the other hand, the operating stations are coupled to the mold carriers in cycles.
- the molds are first opened and the molded part which has already been foamed and hardened is removed, the molds are then closed and provided with release agents and, if necessary, with insert parts. The molds are then filled with the starting components for the production of the molded parts, which fill the cavity when foaming. The molds are then closed with a lid. In the subsequent curing section, the foam mixture introduced into the molds cures under certain temperature and time conditions and then the mold carrier returns to the operating section, so that the cured molded part can be removed from the mold after one cycle.
- the starting components require certain mold temperatures for optimal foaming.
- the mold carriers are preheated to this temperature before the foaming of the molded parts begins and the same temperature is preferably maintained during the curing in order to maintain good foam quality. For this reason, the curing area is usually designed as a tempering tunnel.
- the mold can be transported on rectangular converter systems, which are available in both a horizontal and vertical arrangement.
- the molds on the two longitudinal transport lines are each transported in opposite directions as a unit at equal intervals and at the same transport time or speed, and then converted to the other longitudinal transport line by the transverse converters arranged at both ends.
- transport routes are advantageously divided into an operating route as a lead route and a curing route as a return route.
- the cycle time is made up of the longest downtime required at the operator stations, i.e. the time during which the individual operations take place in the operator stations and the transport time from one operator station to the next.
- a shortening of the cycle time and therefore a higher productivity can only be achieved by shortening the transport time with the same downtime at the operator stations and the same curing time.
- Operating the entire transport system, which is also extended, at a uniformly high drive speed requires expensive and powerful drives, since the entire moving mass consisting of mold carriers, molds and molded parts has to be moved for a short time at a relatively high speed with each cycle.
- Another problem of an extended transport system is often the spatial conditions. In reality, the cycle time is usually not due to the slowest step on the service route, but often due to the slowest step in production, i.e. the curing time, combined with the specified number of molds.
- the properties of the cycle line ie the uniform mold spacing between all stations and the uniform transport speed, have an unfavorable effect on the space requirement and give the entire transport system rigidity with regard to the number of molds and the curing area of the molded parts.
- the curing section which runs parallel to the operating section in a rectangular converter system, must be considerably longer than the operating section, which is why the curing area is usually broken down into a large number of individual sections.
- the empty mold places in the operating stations cause empty cycles, which reduces the productivity of the system.
- Gaps in the curing area are often opened and closed using an electronic control. Stop sensors are usually assigned to all molding stations, with which the desired gaps can be opened or closed by switching the drives of the individual sections on or off.
- Stop sensors are usually assigned to all molding stations, with which the desired gaps can be opened or closed by switching the drives of the individual sections on or off.
- the shapes of the operating section can be pushed into the tempering tunnel of the curing section at the end of work in order to be able to immediately use tempered molds when starting work again.
- the invention is therefore based on the object of creating a conveyor system of the type mentioned at the outset which minimizes the rigidity with regard to the number of molds and the curing area of the molded parts, in that the conveyor system has the disadvantages of the prior art with regard to the complexity and resulting therefrom Overcomes costs with improved productivity.
- the object is achieved with a conveyor system for mold carriers with interchangeable molds for the production of molded parts from elastomers on a closed conveyor line with at least one cycle line (1 a) with operating stations for filling, closing, opening, cleaning and separating the molds and for removing the molded parts and at least one curing area (10) and, if appropriate, devices for introducing and discharging the mold carriers into and / or out of the conveyor line, in which the mold carriers can be decoupled from the cycle line (1a) for curing the molded parts and in the curing area ( 10) can be stowed by means of at least one accumulation conveyor (2a).
- the cycle line includes all operating stations, one or more opening stations, diagnostic stations, removal stations, separation stations, insertion stations, filling stations and closing stations.
- the cycle line preferably contains 10 to 20 cycle stations, particularly preferably 12 to 18.
- the distance between the individual cycle stations is preferably 100 to 1000 mm, particularly preferably 300 to 500 mm.
- the mold carriers are preferably transported to the curing area by at least one accumulation conveyor and accumulated there.
- the curing area is therefore decoupled from the operator stations located on the cycle line. If the mold carrier that has been introduced first has reached the end of the accumulation conveyor and thus the end of the curing area, it is stopped here, within the curing area, and the subsequent mold carriers run against it and accumulate.
- the accumulation conveyor thus enables gaps to be closed as required and mold carriers to be stored at a distance of almost zero in the curing area. There is the best possible optimization of the space requirement, since the lowest possible packing density can be set in the accumulation conveyor. With the same conveying length, there can be significantly more mold carriers in the curing area than in the prior art.
- all mold carriers can be moved into the tempered curing area in order to save the time for tempering the molds which are otherwise outside the curing area when starting work.
- the speed of the accumulation conveyor can be the curing time and the number of molds.
- the speed is preferably between 50 to 250 mm / s, particularly preferably between 100 and 200 mm / s.
- the number of mold carriers is generally between 30 and 400, in particular between 80 and 180 mold carriers. The possibility of using a variable number of mold carriers results from the principle of thawing the mold carriers in the curing area.
- the individual mold carriers therefore have no defined mold positions in the curing area, in contrast to the defined operator positions on the cycle line. The distance between the individual mold carriers in the curing area is therefore variable.
- the number of mold carriers used can be adapted to the respective production, the adaptation to the filling station, ie to the mixing head output, and to the curing time being optimally ensured according to the invention.
- the advantage of decoupling the curing area from the operator stations is that the cycle line cycle is not the slowest step in the entire process, i.e. in most productions the hardening process must be adapted, but can be adapted to the slowest step of the operating route.
- the cycle time is preferably in the range from 2 s to 20 s, particularly preferably from 2 s to 10 s.
- the cycle is therefore adapted to the filling step and can often be shortened by 50% compared to conventional conveyor systems. This adjustment involves an increase in production with falling manufacturing and investment costs, coupled with the advantage of a reduced maintenance requirement of the filling station. Since the mixing head output is only interrupted during the filling of the mold carriers from one station to the other during filling, the risk of clogging of the nozzles is greatly reduced. This can limit one of the main causes of unwanted downtime.
- Another advantage of decoupling is that the moving mass on the cycle line is reduced to a minimum, thus reducing the travel time with lower drive power facilitates higher positioning accuracy.
- the moving mass is independent of the number of mold carriers used.
- the moving mass is preferably in the range from 1t to 15t.
- the conveyor line is composed of at least two longitudinal transport lines, divided into a forward line and at least one return line.
- the forward and return paths are preferably straight and parallel to one another.
- Rectangular conveyors are located between the transport lines, which enable continuous, uninterrupted conveying.
- the rectangular conveyors are preferably operated in cycles.
- the paths from the cycle line, the accumulation conveyors and the rectangular conveyors thus form a closed system in which mold carriers are transported continuously or discontinuously in the roundabout.
- the lead section consists of at least one cycle route, preferably one to ten cycle routes, particularly preferably two to five cycle routes and possibly one or more accumulation conveyors, the length of the accumulation conveyor being variably adaptable to the spatial conditions.
- the return path consists of at least one accumulation conveyor, preferably two to ten accumulation conveyors arranged one behind the other, particularly preferably two to five.
- the accumulation conveyors are preferably driven independently of one another.
- the area of the accumulation conveyor and the rectangular conveyor can be heated and forms the curing area.
- a plurality of return lines two to four, for example three, parallel return lines being particularly preferred. This enables adaptation to long curing times and to the spatial conditions. Since only the lead section must be easily accessible to carry out the various work, the return sections can also be arranged on vertical levels for reasons of space.
- the lead section is preferably at working height to make access to the service section as easy as possible for the personnel.
- the parallel return paths are preferably constructed identically and provided on vertical levels, they can either be in the middle of the rectangular conveyor Be linked in series or in parallel.
- the rectangular conveyors serve as switches.
- the connection via switches has the advantage that an additional rectangular conveyor can be saved, whereas the control is easier to handle with a row-like connection.
- the "first in, first out” principle applies, so that the mold carriers who first reach the curing area also leave it first.
- the sequence of the mold carriers remains unchanged and ensures that the individual production batches are assigned parallel second accumulation conveyor (or the accumulation conveyor unit) only after the first accumulation conveyor has been filled up to its storage capacity.
- the mold carriers do not have to disadvantageously run through the entire length of the accumulation conveyor with a short curing time.
- the devices are preferably connected to a conversion station for mold carriers and a storage facility for mold carriers and molded parts. If only individual mold carriers are replaced, this is preferably done at the beginning of the lead section. If many mold carriers are to be removed without integrating new ones, this is preferably done at the end of the lead section.
- the lock device at the beginning of the lead section is preferably heatable, so that the introduced mold carriers are tempered before filling. The entry or exit can practically at any time and without downtime, i.e. without interrupting production.
- the changeover station can comprise up to 30 mold carriers, preferably 5 to 10, so that a complete changeover from one mold to another is also problem-free. It is also possible to introduce only individual sample parts which are selectively discharged according to the hardening area on the basis of a coding which each mold carrier has. This enables molds of different configurations to be manufactured at the same time.
- the changeover generally consists in the exchange of the article-dependent forms on the mold carriers.
- a diagnostic station can preferably contain a diagnostic instrument installed that monitors product quality during production and displays the results online.
- the reaction can be minimized by reacting immediately when errors occur in production.
- a defective tool can be discharged through the lock at the end of the lead section without leaving a gap between the mold carriers.
- the shape comprises at least one, preferably at least two, particularly preferably 2 parts (A.1 and A.2) which form at least the contour of the outer surface of the cylinder and have at least one base and / or cover part which forms the core is arranged opposite.
- the actual mold (A) can be emptied early and thus be refilled without simultaneously removing the molded body (C) from the core (B). Demolding from the actual mold (A) can take place significantly earlier than removing the core (B) from the cylindrical molded part, since the stresses when removing the outer molded parts are significantly lower than when removing the core (B).
- the other core (B 1 ) from which, preferably parallel to the removal of the core ( B) placed together with the molded part from the mold (A), which is removed in the previous cycle, molded part in the mold (A), which are then filled again in the next step with the starting components to produce a further molded part.
- a molded part passes twice through the curing area of the conveyor system before it is completely removed from the mold, once in the mold and a second time rotated by a certain angle only held by the core.
- the core (B) is preferably removed from the mold (A) with the molded part facing downward or upward.
- the lid of the mold (A) is preferably opened or pushed on and, if appropriate, subsequently folded and the side parts of the mold as far as possible from the molded part which is fixed on the core (B) is removed, preferably pushed away, so that the core with the molded part can preferably be removed from the mold downward.
- the stripping can preferably be carried out in such a way that when the cores (B) and (B 1 ) are lifted, ie when the core (B 1 ) is raised into the mold (A), the core (B) with the molded body has only one upward movement movable flap or pliers, which has a recess for the core, which allows free movement of the core (B) up or down, but due to the recess being too small for the molded body the next time the cores are lowered (B) and (B 1 ) strips the molded body from the core (B).
- This stripping is much gentler on the molded body than pulling off the molded body from the core, for example with automated gripping arms. This preferred stripping reduces the proportion of defective products as desired.
- the mold insert thus has at least two cores (B) and (B 1 ) which are surrounded at different times in the mold (A) with the starting components for the production of the moldings, ie preferably alternately in the mold (A) be positioned for the production of the molded body.
- the cores (B) and (B ') are preferably connected to one another in such a way, for example via a common turning studio or rotating beam, that the changing of the cores by lowering the apparatus on which the cores (B) and (B') are fastened, from the mold (A), a subsequent rotation through 180 ° and a subsequent lifting of the cores, the core (B 1 ) being placed in the mold.
- Each tool can also have more than one shape (A) and, accordingly, more than one Core (B) and optionally and preferably have more than one core (B ').
- A shape
- B Core
- B ' core
- two molds can be arranged next to one another in the mold insert.
- the invention further relates to the process for the production of molded parts from elastomers on the conveyor system according to the invention for mold carriers with at least one cycle line (1a) with operating stations for filling, closing, opening, cleaning and separating the molds and for removing the molded parts and at least one curing area (10) and, if appropriate, devices for introducing and discharging the mold carriers into and / or out of the conveyor line, in which the mold carriers are decoupled from the cycle line (1a) for curing the molded parts and in the curing area (10) be accumulated by means of at least one accumulation conveyor (2a).
- the moldings produced by the process according to the invention can be made from .
- the moldings are particularly preferably based on thermoplastic plastics, rubber and / or plastics made from reactive starting components. Shaped articles based on cellular polyurethane elastomers, which may contain urea groups, are particularly preferred.
- the moldings are particularly preferably cellular polyurethane elastomers with a density according to DIN 53420 of 200 to 1100, preferably 300 to 800 kg / m 3 , a tensile strength according to DIN 53571 of> 2, preferably 2 to 8 N / mm 2 , one Elongation according to DIN 53571 of> 300, preferably 300 to 700% and a tear resistance according to DIN 53515 of> 8, preferably 8 to 25 N / mm.
- the elastomers are preferably microcellular elastomers based on polyisocyanate polyaddition products, preferably with cells with a diameter of 0.01 mm to 0.5 mm, particularly preferably 0.01 to 0.15 mm.
- Elastomers based on polyisocyanate polyaddition products and their preparation are generally known and have been described in many ways, for example in EP-A 62835, EP-A 36994, EP-A 250 969, DE-A 19548770 and DE-A 19548771.
- Figure 1 is a side view of the conveyor system according to the invention, designed as a vertical conveyor with three parallel levels in the heatable area.
- 2 shows a plan view of the cycle line, formed with 15 cycles; 3 side views of a mold carrier with one mold and two cores, shown in four characteristic positions;
- Fig. 4 is a schematic diagram of the conveyor system.
- FIG. 4 schematically shows the representation in Fig. 1.
- the conveyor system has a lead section 1, which consists of a combination of two cycle lines 1 a and a accumulation conveyor 1 b exists, and three return routes 2 to 4.
- the return sections each consist of a combination of two accumulation conveyors arranged one behind the other, labeled 2a and 2b in the example of return section 2.
- Two vertical conveyors 5 and 6 are located between these straight sections. In the area of the vertical conveyors 5 and 6, that is to say the locks 7 and 8 are provided at the beginning and at the end of the leading section.
- the vertical conveyors run in cycles.
- mold carriers F are removed from the circulation via the discharge station 8.1 and fed to a conversion station 9. Mold carriers F that have already been converted and tempered are fed to the transport system via the infeed station 8.2. If several mold carriers F are to be discharged in succession without integrating new ones, this is preferably done via the lock 7. A number of 80 to 180 mold carriers are arranged on the conveyor. The number of mold carriers is adjusted to the production. Depending on the dimensions and design of the vertical conveyors and the return lines, an adaptation to the given spatial conditions and thus an optimal use of space is possible.
- the operating line which is arranged exclusively on the cycle lanes, is at working height, so that it is very easily accessible by the staff.
- the operating section preferably consists of the individual operating stations, the opening station 1.1, the diagnostic station 1.2, the removal station 1.3, the separating stations 1.4 and 1.6, the loading station 1.5, the filling station 1.7 and the closing stations 1.8 consisting of the mold closing station and the lid closing station.
- a temperature-controllable accumulating conveyor follows, which transports the mold carriers F to the vertical conveyor 5.
- the vertical conveyor in turn conveys the mold carriers F to the temperature-controlled return paths, which are designed as a curing area.
- the curing area comprises the accumulation conveyors 2 to 4 arranged one behind the other, which are preferably arranged on parallel vertical planes.
- the entire curing area 1 b, 2 to 4, 5 and 6 is designed as a tempering tunnel, i.e. it is completely enclosed and in particular 1 b and 2 to 4 are preferably tempered. In this way, the molds are always kept in the optimal temperature ranges for curing the foam.
- the mold carriers F become the article-dependent duration of the in the curing area
- the mold carriers F are conveyed on the service section 1a with a cycle time of preferably 5s, the filling time preferably being 4s and approximately 1s being required to move the mold carriers F from one cycle station to another.
- the distance between the clock stations is preferably 300 to 500 mm.
- the moving mass is preferably 1 to 5t.
- the transport routes are composed of several drive sectors, the two cycle routes are preferably designed with one drive and each return route of the accumulation conveyor chain with two drives.
- mold inserts which contain at least one mold (A) and at least two cores (B and B '), as in Fig. 3 shown.
- the mold is open, ie the lid (A.3) is opened and the side parts (A.1 and A.2) are pushed away from the molded part.
- the molded part (C) produced in the mold (A) in the previous step and located on the core (B 1 ) is located above the stripper (D), the new molded part (C) on the core (B) is still in the mold (A).
- Fig. 3.3 is after the rotation of the bar (E) by 180 ° and lifting the cores (B) and (B 1 ) and the bar (E) the core (B 1 ) in the form (A) and the core (B) with the new molded part (C) "above” the flap (D).
- Fig. 3.4 the mold (A) was closed by pushing the side panels (A.1) and (A.2) shut and closing the cover (A.3).
- the flap (D) was moved away from the core (B) and the new molded part (C).
- the flap (D) folded down and is pushed back under the molded part (C) when the mold (A) is opened (see Fig.3.1).
- Fig.3.1 The working step following Fig.3.4 can be seen in Fig.3.1, i.e. the positions or work steps shown in FIGS. 3.1 to 3.4 would preferably be operated continuously.
- the curing area can be made very short, since each shape passes through it twice.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003296729A AU2003296729A1 (en) | 2003-01-14 | 2003-12-24 | Conveyor system comprising an accumulation conveyor, and method for producing moulded parts consisting of elastomers |
DE10393857T DE10393857D2 (en) | 2003-01-14 | 2003-12-24 | Conveyor with accumulation conveyor and process for the production of molded parts from elastomers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10301141.2 | 2003-01-14 | ||
DE2003101141 DE10301141A1 (en) | 2003-01-14 | 2003-01-14 | Conveyor system and method for producing molded parts from elastomers |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004062876A1 true WO2004062876A1 (en) | 2004-07-29 |
Family
ID=32519961
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/014874 WO2004062876A1 (en) | 2003-01-14 | 2003-12-24 | Conveyor system comprising an accumulation conveyor, and method for producing moulded parts consisting of elastomers |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2003296729A1 (en) |
DE (2) | DE10301141A1 (en) |
WO (1) | WO2004062876A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1283972A (en) * | 1969-06-25 | 1972-08-02 | Antony Harry Croucher | Improvements in or relating to conveyors |
DE2157269A1 (en) * | 1971-11-18 | 1973-05-24 | Zippel Gmbh | TRANSFER SYSTEM |
US4325688A (en) * | 1979-07-16 | 1982-04-20 | Toyo Rubber Chemical Industrial Corporation | Mold equipment |
US4495120A (en) * | 1980-11-11 | 1985-01-22 | Ikeda Bussan Co., Ltd. | Method for manufacture of shaped article of polyurethane foam |
DE19717238C1 (en) * | 1997-04-24 | 1998-10-01 | Liebherr Hausgeraete | Foaming of flat mouldings in a recirculating system comprising upper and lower production lines |
DE19717240C1 (en) * | 1997-04-24 | 1998-11-12 | Greiz Plasttechnik | System conveying foam moulds through tempering section of automatic plant |
-
2003
- 2003-01-14 DE DE2003101141 patent/DE10301141A1/en not_active Withdrawn
- 2003-12-24 DE DE10393857T patent/DE10393857D2/en not_active Expired - Lifetime
- 2003-12-24 WO PCT/EP2003/014874 patent/WO2004062876A1/en not_active Application Discontinuation
- 2003-12-24 AU AU2003296729A patent/AU2003296729A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1283972A (en) * | 1969-06-25 | 1972-08-02 | Antony Harry Croucher | Improvements in or relating to conveyors |
DE2157269A1 (en) * | 1971-11-18 | 1973-05-24 | Zippel Gmbh | TRANSFER SYSTEM |
US4325688A (en) * | 1979-07-16 | 1982-04-20 | Toyo Rubber Chemical Industrial Corporation | Mold equipment |
US4495120A (en) * | 1980-11-11 | 1985-01-22 | Ikeda Bussan Co., Ltd. | Method for manufacture of shaped article of polyurethane foam |
DE19717238C1 (en) * | 1997-04-24 | 1998-10-01 | Liebherr Hausgeraete | Foaming of flat mouldings in a recirculating system comprising upper and lower production lines |
DE19717240C1 (en) * | 1997-04-24 | 1998-11-12 | Greiz Plasttechnik | System conveying foam moulds through tempering section of automatic plant |
Non-Patent Citations (1)
Title |
---|
SULZBACH H-M: "TECHNIK DER RATIONELLEN GROSSSERIENFERTIGUNG VON PUR-FORMTEILEN FURDEN AUTOMOBILBAU", KUNSTSTOFFBERATER, KUNSTSTOFF VERLAG. ISERNHAGEN, DE, vol. 34, no. 5, 1 May 1989 (1989-05-01), pages 30 - 35, XP000114246, ISSN: 0172-6374 * |
Also Published As
Publication number | Publication date |
---|---|
DE10301141A1 (en) | 2004-07-22 |
DE10393857D2 (en) | 2006-02-09 |
AU2003296729A1 (en) | 2004-08-10 |
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