GB2333488A - Moulding hygroscopic plastics material - Google Patents

Moulding hygroscopic plastics material Download PDF

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Publication number
GB2333488A
GB2333488A GB9801414A GB9801414A GB2333488A GB 2333488 A GB2333488 A GB 2333488A GB 9801414 A GB9801414 A GB 9801414A GB 9801414 A GB9801414 A GB 9801414A GB 2333488 A GB2333488 A GB 2333488A
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GB
United Kingdom
Prior art keywords
granules
hopper
moulding machine
moulding
loader
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.)
Granted
Application number
GB9801414A
Other versions
GB9801414D0 (en
GB2333488B (en
Inventor
Patrick Woods
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.)
Nypro Research and Developments Ltd
Original Assignee
Nypro Research and Developments Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to IE980034A priority Critical patent/IES980034A2/en
Application filed by Nypro Research and Developments Ltd filed Critical Nypro Research and Developments Ltd
Priority to GB9801414A priority patent/GB2333488B/en
Publication of GB9801414D0 publication Critical patent/GB9801414D0/en
Publication of GB2333488A publication Critical patent/GB2333488A/en
Application granted granted Critical
Publication of GB2333488B publication Critical patent/GB2333488B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/083—Humidity by using sorbent or hygroscopic materials, e.g. chemical substances, molecular sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
    • B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/0005—Direct recuperation and re-use of scrap material during moulding operation, i.e. feed-back of used material
    • 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
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/02—Dispensing from vessels, e.g. hoppers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/14—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas
    • F26B17/1408—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas the gas being supplied and optionally extracted through ducts extending into the moving stack of material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/041—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying flowable materials, e.g. suspensions, bulk goods, in a continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/16—Auxiliary treatment of granules
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/005—Using a particular environment, e.g. sterile fluids other than air
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0003—Discharging moulded articles from the mould
    • B29C37/0007—Discharging moulded articles from the mould using means operable from outside the mould for moving between mould parts, e.g. robots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0092—Other properties hydrophilic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Abstract

A method for moulding hygroscopic plastics material in a clean room environment comprises drawing granules of hygroscopic plastics material from a supply container 10 into a hopper loader 13 by means of a vacuum drawn on the hopper loader 13 by a plant room vacuum pump. The granules are then delivered into a drying hopper 15 and air from the drying hopper 15 is drawn by a dessicator vacuum pump in a closed loop to substantially remove moisture from the air in a dessicator 22. Heated air from the dessicator 22 is delivered to the granules in the drying hopper 15 to substantially remove moisture from the granules. On removal of moisture from the granules in the drying hopper 15, the dessicated granules are drawn to a hopper loader 1 of a moulding machine in the clean room environment by means of a main vacuum pump 30. The main vacuum pump 30 draws air in a closed loop from the hopper loader 1 of the moulding machine through a dust separator 31 and a filter 32 and draws the dessicated granules from the drying hopper 15 to the hopper loader 1. Positive pressure in the dessicated granules stream is released prior to delivery to the hopper loader 1 to maintain the integrity of the clean room environment.

Description

"A method for moulding hygroscopic plastics material" Introduction The invention relates to a method for moulding hygroscopic material in a clean room environment.
Many products such as plastics parts used as components in computer peripherals and the like must be manufactured from plastics materials with specific properties required by their application. Most of these specialist plastics materials are, however, hygroscopic. It is know to dry such hygroscopic materials in a dryer using heated air. There are, however, problems with existing systems for handling such materials in a clean room environment as the material often enters the clean room environment under a positive pressure which may cause serious contamination of the clean room environment by ingress of dirt particles. There are also particular problems in providing systems to guarantee traceability of the moulding products produced in such environments.
This invention is therefore directed towards providing an improved method of moulding hygroscopic materials which will overcome at least some of the problems.
Statements of Invention According to the invention there is provided a method for moulding hygroscopic plastics material in a clean room environment comprising the steps of: drawing granules of hygroscopic plastics material from a supply container into a hopper loader by means of a vacuum drawn on the hopper loader by a plant room vacuum pump; delivering the granules into a drying hopper; drawing air from the drying hopper to a dessicator vacuum pump in a closed loop to substantially remove moisture from the air in a dessicator; delivering heated air from the dessicator to the granules in the drying hopper to substantially remove moisture from the granules; on removal of moisture from the granules in the drying hopper, drawing the dessicated granules to a hopper loader of a moulding machine in the clean room environment by means of a main vacuum pump, the main vacuum pump drawing air in a closed loop from the hopper loader of the moulding machine through a dust separator and a filter and drawing the dessicated granules from the drying hopper to the hopper loader of the moulding machine in a clean room; and releasing positive pressure in the dessicated granules stream prior to delivery to the hopper loader of the moulding machine to maintain the integrity of the clean room environment; and moulding the plastics in the moulding machine to from a moulded article.
In a particularly preferred embodiment of the invention positive pressure in the dessicated granules stream is released by linking the dessicated granules stream with the suction side of the dessicator vacuum pump.
In a preferred arrangement the method includes the step of delivering waste material from the moulding machine into a chute for delivery to a grinder dedicated to that moulding machine, regrinding the waste material and collection the regrind material in a regrind container dedicated to that moulding machine.
Preferably the chute is removable by a quick release coupling for cleaning of the chute and associated granulator.
In a preferred embodiment of the invention regrind material from the granulator dedicated to the moulding machine is delivered on demand to the hopper loader of the drying hopper and the method includes the step of proportionately mixing the virgin and regrind materials at the delivery to the hopper loader of the drying hopper.
Preferably a number of articles are moulded by the moulding machine in a number of different tool cavities at the same time, and the method includes the steps of opening the mould, removing the articles from the mould, delivering the articles in a preset pattern to separate chutes, each dedicated to a particular tool cavity of the mould, and, delivering the articles into a specific collection tray associated with a single tool cavity.
In this case preferably the articles are removed from the mould by a common removal tool, each article being removed from the tool by applying a knock to the article to partially release it from the tool cavity, and gripping the partially released article for delivery to the chute dedicated to articles from that tool cavity.
The invention also provides moulding articles whenever produced by the method of the invention.
Brief Description of the drawings The invention will be more dearly understood from the following description thereof given by way of example only, with reference to the accompanying drawings, in which: Fig. 1 is a schematic diagram of apparatus used in a method for moulding hygroscopic materials according to the invention; Fig. 2 is a perspective view of a regrind system used in the method of the invention; Fig. 3 is a perspective view on an enlarged scale of part of the regrind system of Fig. 2; Fig. 4 is a front view of a moulded part removal head used in the method of the invention; Fig. 5 is a side view of the head of Fig. 4, in use; Fig. 6 is a perspective view of a moulding machine and associated moulded parts sorting system used in the method of the invention; and Fig. 7 is a perspective view of the sorting system.
Detailed Descrintion Referring to the drawings and initially to Fig. 1 thereof there is schematically illustrated apparatus used in the method of the invention for moulding hygroscopic plastics material in a clean room environment. The clean room has a number of independent moulding machines, each having an independent system for drying and delivery of dried plastics granules to that moulding machine. One such drying and delivery system is illustrated in Fig. 1. The moulding machine has a hopper loader 1 from which plastics granules are fed to a feed hopper 2 of the machine. The dried plastics granules are delivered to the hopper loader 1 through a feed line 3 using a vacuum which is drawn on the hopper loader 1 along a dried granules vacuum line 4.
Granules of hygroscopic plastics material are drawn from a supply container 10 along a feed line 11 through a proportional mixing unit 12 to a hopper loader 13 of a drying hopper 15. After drying, the dried granules are drawn along the feed line 3 to the hopper loader 1 of the moulding machine in the clean room.
Air is drawn through the drying hopper 15 in a closed loop by a vacuum pump (not shown) which sucks the air through a suction line 20, through a filter 21 and into a dessicator unit 22 in which the air is heated to substantially remove moisture before return of heated air along a heated air delivery line 23 to a distributor unit 24 adjacent to the base of the drying hopper 15. The heated air percolates up through the bed of the plastics material in the drying hopper 15 and the cooled air is sucked out along the suction line 20 to the dessicator 22. Heated air is drawn through the bed of plastics granules in this way for a sufficient period to allow substantially all of the moisture to be removed from the plastics granules.
A second closed loop vacuum system is used to draw the dried plastics granules into the hopper loader 1 of the associated moulding machine. This vacuum system has a vacuum pump 30 with a suction side connected through a cyclone/dust separator 31 and a filter 32 to the vacuum line 4 connected to the hopper loader 1 of the moulding machine. The positive pressure side of the vacuum pump 30 is connected via a non return valve 37 to a delivery unit 40 in which dried plastics granules from the base of the drying hopper 14 are entrained and delivered into the feed line 3 to the moulding machine hopper loader 1.
In order to maintain the integrity of the clean room environment in which the moulding machine is located positive pressure in the dessicated/dried granules stream is released. The pressure release is achieved by linking the dessicated granules stream to the suction side of the dessicator vacuum system. In this case, for ease of installation the linkage is established by means of a link line 50 connected between the inlet side of the filter 21 on the dessicator vacuum system and the an outlet leg 51 of the positive pressure side of the vacuum pump 30 upstream of the non-return valve 37. In this way the positive pressure developed by the outside air which is drawn into the system on feeding of virgin plastics material from the supply container 10 is prevented from being delivered into the dessicated plastics material feed to the hopper loader 1 of the moulding machine in the clean room. Thus, possible ingress of dust etc into the clean room is avoided and the integrity of the clean room environment is maintained.
Referring to the Figs. 2 and 3 waste material in the from of flash and any reject products from the moulding machine 60 is delivered through a chute 61 adjacent the machine 60 and extending through a floor 62 to an underfloor re-grinding system dedicated to the particular moulding machine 60. The re-grinding system comprises a granulator 65 dedicated to the particular moulding machine with a regrind delivery line 66 for collection of the regrind associated with the specific moulding operations carried out by the moulding machine 60. If desired the regrind may be connected to a regrind inlet 67 of the proportional mixing device 12 as illustrated in Fig. 1, for mixing in a desired proportion with virgin undried plastics material being delivered to the drying hopper 15.
The regrind chute comprises a portion 61b extending through the floor 62, a flexible portion 61c at the inlet to the granulator 65 and a removable portion 61a which is connected by a quick release coupling, in this case in the from of a bayonet type fitting 67, to the fixed portion 61 b of the chute 61. In this way the feed chute 61 for the granulator may be easily thoroughly cleaned between moulding batches.
Referring to Figs. 5 to 8, in the clean room environment a number of articles such as components 70 are moulded by the moulding machine 60 having a first mould part 71 and a second mould part 72. The components 70 are formed in a number of different tool cavities at the same time. For traceability and quality control the components 70 from each separate tool are delivered into separate containers 75.
In Figs. 4 and 5 four components 70 are illustrated being removed from the mould at the same time by a removal head 76 mounted on a robotic arm 77. The components 70 are then delivered into separate chutes 78 for delivery by an associated conveyors 79 to a container 75. In the apparatus illustrated in Figs. 6 and 7 there are eight separate delivery chutes 78a, 78b, 78c, 78e, 78f, 78g, 78h, and associated conveyors 79 and containers 75 which are indicated in a similar way. Four of the chutes 78 deliver four separate components to an upper level 80 of a conveyor frame having two independently driven conveyors 81 at opposite sides of the chutes 78 one for delivery of two components to one end and the other for delivery of two components to the other end. The two components at each end are led to the associated containers by deflectors 82. Similarly the conveyor frame has a lower level 83 to which four components are delivered by four of the chutes 78, the components being led to their respective containers 75 using a similar arrangement of conveyors 81 and deflectors 82. This conveyor system provides a highly efficient method of sorting and packaging separate components in accordance with the tool cavity used to mould them. In this way component defects can be traced readily to a particular tool cavity.
It will be appreciated that for a four component set-up the conveyor system would be of simpler design, requiring only one level 80, 83 or single conveyors on the top and bottom levels.
Referring in particular to Figs. 4 and 5 the moulded component removal head 76 is illustrated in detail, in this case for removing four components simultaneously from the mould half 71. On opening of the mould, the head 76 is moved into the position illustrated in Fig. 5. Each component 70 is manipulated using a suction cup 90 operated by a piston 91, a gripper head 92 operated by a gripper ram 93, and a striker head 94 operated by a ram 95. In use, a component 70 is engaged by the gripper head 92 and suction cup 90 and is struck a light blow by the striker head 94 to loosen it from the corresponding mould and allow it to be readily lifted out of the mould and delivered to the conveyor system using the robotic arm 77.
The method of the invention ensures that the ingress of foreign material into the clean room is avoided while also providing a highly efficient regrind system and moulded component handling system. A high level of quality control can be maintained with minimum cost.
The invention is not limited to the embodiments hereinbefore described which may be varied in detail.

Claims (9)

  1. Claims 1. A method for moulding hygroscopic plastics material in a clean room environment comprising the steps of: drawing granules of hygroscopic plastics material from a supply container into a hopper loader by means of a vacuum drawn on the hopper loader by a plant room vacuum pump; delivering the granules into a drying hopper; drawing air from the drying hopper to a dessicator vacuum pump in a closed loop to substantially remove moisture from the air in a dessicator; delivering heated air from the dessicator to the granules in the drying hopper to substantially remove moisture from the granules; on removal of moisture from the granules in the drying hopper, drawing the dessicated granules to a hopper loader of a moulding machine in the dean room environment by means of a main vacuum pump, the main vacuum pump drawing air in a closed loop from the hopper loader of the moulding machine through a dust separator and a filter and drawing the dessicated granules from the drying hopper to the hopper loader of the moulding machine in a clean room; and releasing positive pressure in the dessicated granules stream prior to delivery to the hopper loader of the moulding machine to maintain the integrity of the clean room environment; and moulding the plastics in the moulding machine to from a moulded article.
  2. 2. A method as claimed in claim 1 wherein positive pressure in the dessicated granules stream is released by linking the dessicated granules stream with the suction side of the dessicator vacuum pump.
  3. 3. A method as claimed in claim 1 or 2 including the step of delivering waste material from the moulding machine into a chute for delivery to a grinder dedicated to that moulding machine, regrinding the waste material and collection the regrind material in a regrind container dedicated to that moulding machine.
  4. 4. A method as claimed in claim 3 wherein portion of the chute is removable by a quick release coupling for cleaning of the chute and associated granulator.
  5. 5. A method as claimed in claim 3 or 4 wherein regrind material from the granulator dedicated to the moulding machine is delivered on demand to the hopper loader of the drying hopper and the method includes the step of proportionately mixing the virgin and regrind materials at the delivery to the hopper loader of the drying hopper.
  6. 6. A method as claimed in any preceding claim wherein a number of articles are moulded by the moulding machine in a number of different tool cavities at the same time, and the method includes the steps of opening the mould, removing the articles from the mould, delivering the articles in a preset pattern to separate chutes, each dedicated to a particular tool cavity of the mould, and, delivering the articles into a specific collection tray associated with a single tool cavity.
  7. 7. A method as claimed in claim 6 wherein the articles are removed from the mould by a common removal tool, each article being removed from the tool by applying a knock to the article to partially release it from the tool cavity, and gripping the partially released article for delivery to the chute dedicated to articles from that tool cavity.
  8. 8. A method for moulding hygroscopic plastics material in a clean room environment substantially as hereinbefore described with reference to the accompanying drawings.
  9. 9. Moulded articles whenever produced by a method as claimed in any preceding claim.
GB9801414A 1998-01-19 1998-01-22 A method for moulding hygroscopic plastics material Expired - Fee Related GB2333488B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
IE980034A IES980034A2 (en) 1998-01-19 1998-01-19 A method for moulding of hygroscopic plastics material
GB9801414A GB2333488B (en) 1998-01-19 1998-01-22 A method for moulding hygroscopic plastics material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IE980034A IES980034A2 (en) 1998-01-19 1998-01-19 A method for moulding of hygroscopic plastics material
GB9801414A GB2333488B (en) 1998-01-19 1998-01-22 A method for moulding hygroscopic plastics material

Publications (3)

Publication Number Publication Date
GB9801414D0 GB9801414D0 (en) 1998-03-18
GB2333488A true GB2333488A (en) 1999-07-28
GB2333488B GB2333488B (en) 2002-06-12

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Application Number Title Priority Date Filing Date
GB9801414A Expired - Fee Related GB2333488B (en) 1998-01-19 1998-01-22 A method for moulding hygroscopic plastics material

Country Status (2)

Country Link
GB (1) GB2333488B (en)
IE (1) IES980034A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112476843A (en) * 2020-11-24 2021-03-12 吴江鼎泰电子材料有限公司 Plastic product processing device with dust removal function
WO2024008820A1 (en) * 2022-07-05 2024-01-11 Motan Holding Gmbh Method for drying bulk material, especially granular plastic material, and drying device for such material

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0624443A1 (en) * 1993-05-11 1994-11-17 MORETTO P.A. S.r.l. Dehumidifier for plastic materials in granules
WO1995011121A1 (en) * 1993-10-18 1995-04-27 Karl Hehl Feeding device
US5513445A (en) * 1993-01-13 1996-05-07 Fasti Farrag & Stipsits Gmbh Method of operating a drier for powdered, granulated and pourable materials and a drier operating in accordance with the method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5513445A (en) * 1993-01-13 1996-05-07 Fasti Farrag & Stipsits Gmbh Method of operating a drier for powdered, granulated and pourable materials and a drier operating in accordance with the method
EP0624443A1 (en) * 1993-05-11 1994-11-17 MORETTO P.A. S.r.l. Dehumidifier for plastic materials in granules
WO1995011121A1 (en) * 1993-10-18 1995-04-27 Karl Hehl Feeding device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112476843A (en) * 2020-11-24 2021-03-12 吴江鼎泰电子材料有限公司 Plastic product processing device with dust removal function
WO2024008820A1 (en) * 2022-07-05 2024-01-11 Motan Holding Gmbh Method for drying bulk material, especially granular plastic material, and drying device for such material

Also Published As

Publication number Publication date
IES79673B2 (en) 1998-05-20
GB9801414D0 (en) 1998-03-18
GB2333488B (en) 2002-06-12
IES980034A2 (en) 1998-05-20

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20120122