US3279125A - Machine for controlled freezing, deflashing and trimming of parts - Google Patents

Machine for controlled freezing, deflashing and trimming of parts Download PDF

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Publication number
US3279125A
US3279125A US366755A US36675564A US3279125A US 3279125 A US3279125 A US 3279125A US 366755 A US366755 A US 366755A US 36675564 A US36675564 A US 36675564A US 3279125 A US3279125 A US 3279125A
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United States
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parts
housing
machine
cold
air
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Expired - Lifetime
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US366755A
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English (en)
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Raymond M Leliaert
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Individual
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Priority to US366755A priority Critical patent/US3279125A/en
Priority to GB16796/65A priority patent/GB1073057A/en
Priority to CH566265A priority patent/CH430169A/de
Priority to AT385465A priority patent/AT291548B/de
Priority to DE19651479859 priority patent/DE1479859B2/de
Priority to SE6189/65A priority patent/SE309109B/xx
Priority to BE663793D priority patent/BE663793A/xx
Priority to JP40027422A priority patent/JPS5231598B1/ja
Application granted granted Critical
Publication of US3279125A publication Critical patent/US3279125A/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B24C1/083—Deburring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
    • B24C3/26—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by barrel cages, i.e. tumblers; Gimbal mountings therefor
    • B24C3/263—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by barrel cages, i.e. tumblers; Gimbal mountings therefor using refrigerating means

Definitions

  • This invention relates to the removal of thin fins, burrs and flashings from parts molded of rubber, plastics, metal and the like materials which are capable of embrittlement or are changed in physical properties in response to reduction in temperature and it relates more particularly to and means for the reduction in temperature to freeze fins and flashings of thin cross-section formed on molded or other parts to effect embri-ttlement and the removal of the embrittled fins or flashings by engagement with an impact or blast of particulate material.
  • This invention is addressed to an improvement in the means described in my previously issued patent and it is an object of this invention to provide a means for achieving same.
  • an object of this invention to provide an apparatus for the efficient and effective removal of fins and flashings and other thin sections projecting from the surfaces of molded and fabricated parts and it is a related object to provide a means of the type described in which more efficient utilization is made of the refrigeration materially to reduce the refrigeration required for the rem-oval of fins, flashings, and such thin cross-sections and to provide improved finished parts, and which makes more effective utilization of the refrigeration to enable use of refrigerated air or other gas or fluid for the controlled freezing of the parts and to enable better distribution of the refrigeration thereby more effectively to cool the parts for better coverage and more complete freezing of the portions to be removed.
  • Another object is to provide a means of the type described in which the flow of the refrigerated air or fluid through the machine is intended to achieve a more complete coverage of the part and more uniform distribution of the cold through the Working area of the machine; which provides for substantial separation of the cold fluid or aid from the particulate materials with which the parts are blasted thereby to enable recycle of the cold air or fluid for the recovery of cold invested in refrigeration; which recycles cold air or fluid not only from the working area but also from the surrounding environment thereby to enable refrigeration of the surrounding environment for more effective refrigeration of the parts, and which makes available refrigerated air for use in the mechanical abrasive blast of the parts thereby to avoid interference with the embrittlement of the parts.
  • FIG. 1 is a schematic elevational view from the front side of a machine embodying the features of this invention
  • FIG. 2 is a schematic elevational view of the machine shown in FIG. 1 as viewed from the side;
  • FIG. 3 is a schematic view of the machine shown in FIGS. 1 and 2 but in plan view from the top side.
  • a movable door 22 is provided through which consecutive batches of parts and workpieces may be loaded into the deflashing chamber and unloaded therefrom for delivery onto an unloading chute 23.
  • the conveyor 12 is driven so that the top strand portion thereof moves continuously inwardly and upwardly towards the pulley 14.
  • the workpieces are continuously drawn by the conveyor inwardly and upwardly with the conveyor until such time as they gently turn over and away from the vertical climb portion.
  • the conveyor is preferably provided with cleats to facilitate displacement and turning over of the workpieces during operation of the conveyor.
  • An unloading chute 23 is provided to receive the finished pieces when a batch deflashing operation is completed and the conveyor is reversed in its direction of operation to displace the workpieces forwardly ofr of the end of the conveyor for passage through the open door onto the chute.
  • the construction of the conveyor 12 may be 'of any preferred form, but by way of an example, it may comprise a specially compounded abrasive-resistant rubber or plastic material characterized to remain flexible under sub-zero temperature conditions to which it may be exposed. Instead, it may be in the form of an apron type conveyor comprising articulated slats or aprons formed of metal or the like.
  • the conveyor device is enclosed within a housing 25 which conveniently mounts one or more abrasive media projecting machines 26.
  • the abrasive blast project-ing machines may be of any suitable type, such for example as the machine disclosed in Patent No. 2,708,814.
  • the blast machine or machines 26 will be power driven, as by a motor '28, and arranged to direct, preferably by centrifugal wheel blast technique, streams or patterns of steel shot or other abrasive material directly downwardly into the housing 25 between the barrel heads 18 so as to strikeagainst the workpieces 10 which are cradled in the conveyor device.
  • the blast machine or machines 26 will be arranged to throw the blast media against the workpieces in the. form of patterns or streams, as indicated by the numeral 30.
  • the blast machines 26 are arranged to be supplied continuously with blast media as through an abrasive storage hopper 42, and it will be understood that more than one blast machine may be employed for the purpose of directing additional streams of blast material for more complete coverage of the workpieces.
  • An abrasive valve 32 is provided between the storage hopper'42 and the feed funnel of the blast machine 26.
  • This valve preferably is sealed from the surrounding atmosphere to prevent or minimize entrainment of relatively warm air from the insulated enclosure 78 into the centrifugal blasting wheel by its pumping action and said wheel projecting this warmer air onto the workpieces 10. This sealing is particularly important when materials such as organo-silicon parts are being defiashed.
  • the seal around abrasive valve 32 may be fabricated of rubber sheet having a low embrittlement temperature and fastened in an air tight manner or the seal may be fabricated of sheet metal using practices common to this art.
  • the workpiece support conveyor 12 is of perforate form to permit passage therethrough of spent pellets or abrasive, the spent cold air used to refrigerate the parts, and small particles of fine or flashings which have been detached from the workpieces during treatment in the device.
  • the conveyor may be formed with drain holes therethrough or may be otherwise constructed in a preferred manner so as to provide openings through which the spent abrasive, smaller refuse and spent air may escape downwardly onto machine hopper wall 33 over hopper 34 and adjacent to an inlet portion of an elevator 36 which delivers the mixture of refuse, abrasive media and the like to a separator, indicated by the numeral 38.
  • the separator mechanism may be of any preferred form and may include a rotary screen 40 and/or an air wash separator.
  • the separator 38 will be arranged so as to discharge the waste of the feed mixture including non-reusable portions of abrasive media and the removed fins and flash particles. Reusable abrasive is fed .by gravity into the abrasive storage hopper 42.
  • the cold air from the heat exchanger enters the machine through the inlet passage 60 for flow through the passage into the housing 25 to a distributor 62 positioned within the housing to extend crosswise and lengthwise thereof above the conveyor and forwardly thereofwith nozzles angled to direct the cold air streams 64 angularly downwardly onto the surface of the conveyor in more or less uniform distribution across the area in which the workpiece 10 to be treated are cradled.
  • the .dis-. tributor 62 functions as a plenum chamber suspended from the top wall of the housing but preferably insulated therefrom with the outlet openings or. nozzles uniformly distributed across the bottom wall of the distributor for the distribution of the cold air as streams from the bottom side thereof.
  • the interior of the housing 25 is also provided with a baflie plate 66 which is secured to the backside of the housing in the region beyond and below the underside of the conveyor to extend angularly downwardly and forwardly across the housing from a line which corresponds to about the lower level of the conveyor forwardly to a line below the conveyor but just short of the machine hopper wall 33 whichextends across the bottom portion of the housing below the conveyor from the front wall angularly downwardly and rearwardly to the backside of the housing.
  • the baffie plate 66 is intended to prevent the refrigerated air projected onto the conveyor from the .dis-
  • the inclined baffle plate 66 operates not only to divert the refrigerated air but it also functions in the manner of a separator to displace the spent shot and abrasive material forwardly over its surface to the underlying hopper wall 33 thereby to assist in the separation of the spent refrigerated air from the shot and from the abrasive materials or solids falling from the conveyor.
  • the cold refrigerated air introduced from the nozzles of the distributor 62 follows a path through the conveyor belt and the workpieces supported thereon and then downwardly and forwardly about the lower end of the baiflle plate 66 for continued flow rearwardly. into the plenum chamber 68 defined by the baffle plate 66..
  • Air flowing from the interior of the insulated enclosure 78 into the separator 38 to separate the refuse from re-' usable abrasive media is caused to flow through pipe 76 for joinder withthe spent refrigerated lair exhausted from the housing for travel together through the pipe 72 to the dust collector.
  • Included with the spent refrig-q erated air exhausted from the-housing 25 and cycled to the dust collector may be a relatively small amout of air;
  • a mechanical refrigeration unit 94 is employed to cool said air.
  • Control panel 88 controls the refrigeration and defrost cycles of the mechanical refrigeration unit 94.
  • the dust collector is belt driven by an electrical motor 84.
  • control panel 90 which is a control center for the refrigeration cycle, including the amount of refrigerant passed in heat exchange relationship with the recycled refrigerated air, the proportion of refrigerated gas bypassing the heat exchangers and other controls in air movement, all in response to temperature controllers within the housing and the temperature selected for operation on the particular type of material of which the workpieces are formed and which are to be processed in the machine.
  • Panel 90 also is a control center for the deflashing machine operation including controlling the opening and closing of doors, turning on and off the centrifugal blasting wheels, varying the speed of the motors driving the blasting wheels, varying the amount of abrasive thrown by the wheels onto the workpieces and operating the conveyor and its speed of travel.
  • Control panel 90 is an integrated unit of timers, temperature sensor, amplifying and transmitting devices, indicating lights for display of operating functions, selector switches and push button stations for controlling and operating the refrigeration engine and other components of the refrigeration system and components of the deflashing machine in either manual or automatic programmed cycles.
  • it may include timers of the mechanical, pneumatic or solid state type and it may include temperature sensor-transmitter arrangements such as the pneumatic arrangements manufactured by the Foxboro Company which may use gas filled sensor bulbs which measure or compare temperatures and amplify signals to operate pneumatic or hydraulic motor valves, electrically operated motor valves or other appropriate control systems; or it may include temperature sensor-transmitter arrangements using thermocouples Which produce an electrical signal which can be amplified and transmitted to operate motor control valves or other control devices on the refrigeration and deflashing machines.
  • temperature sensor-transmitter arrangements such as the pneumatic arrangements manufactured by the Foxboro Company which may use gas filled sensor bulbs which measure or compare temperatures and amplify signals to operate pneumatic or hydraulic motor valves, electrically operated motor valves or other appropriate control systems
  • thermocouples which produce an electrical signal which can be amplified and transmitted to operate motor control valves or other control devices on the refrigeration and deflashing machines.
  • the'housing 25 is enclosed within a substantially airtight and thermally insulated enclosure 78, cooled by mechanical refrigeration unit 94, as previously described.
  • the housing 25, the blast wheels 26, the elevator 36, the separator 38 and the dust collector 74 are all combined within the heat insulated enclosure 78 into which cold air is bled from the dust collector to maintain the enclosure in a balanced state of pressure. This serves to maintain sub-ambient temperatures in the area of the blast operation and operates to reduce the amount of refrigeration required by the heat exchanger.
  • suitable access doors such as the service door 92 and loading and unloading door 22 will be provided for access to the interior of the enclosure and to the interior of the housing.
  • the workpieces are loaded onto the conveyor -12 through the door 22 which is adapted for power operation between open and closed positions and which is adapted to be displaced in closed position to efifect a sealing relations within the housing to minimize the loss of cold from within the housing.
  • the delivery chute 23 Aligned with the lower end of the door is the delivery chute 23 over which the workpieces are displaced for delivery from the housing when the conveyor is reversed to displace the workpieces forwardly to the door opening.
  • a machine for definning and deflashing parts comprising a housing, means for supporting the parts within said housing and for continuously tumbling the parts, means for projecting a stream of particulate material onto said parts in said housing, means for projecting a cold fluid into said housing into engagement with said parts for reducing the temperature of the parts to cause embrittlement of the thin fins and flashings whereby the embrittled fins and flashings are easily removed upon engagement by the stream of particulate materials, a dust collector having an inlet in communication with the housing for receiving spent cold fluid and entrained particulate material including particles of fins and flashings removed from said parts, and for separating said spent cold fluid from said particles, said dust collector having an outlet for return of separated spent cold fluid for re-refrigeration, and in which the means for projecting the stream of cold fluid into the housing comprises a distributor extending across the housing and having outlets for issuance of the cold fluid as a plurality of streams distributed across the housing and issuing in the direction of the parts.
  • a machine as claimed in claim 1 in which the distributor extends across an upper portion of the housing with the outlets in the lower portion thereof for the issuance of the cold fluid as a plurality of spaced apart streams distributed across the housing and directed downwardly onto the parts.
  • a machine as claimed in claim 2 in which the outlets are uniformly spaced in the distributor to extend across the housing.
  • a dust collector having an inlet in communication with the housing for receiving spent cold fluid and entrained particulate material including particles of fins and flashings removed from said parts and for separating said spent cold fluid from said particles, said dust collector having an outlet for return of separated spent cold fluid for re-refrigeration, and a baflle plate within the housing beyond the parts and extending across the stream of the cold fluid introduced into the housing and confronting the inlet to the separator to prevent channelling of the stream of cold fluid and to effect preliminary separation between the spent
  • a machine as claimed in claim 4 in which the baflie plate extends across the housing beyond and below the parts supported within the housing and positioned to project angularly downwardly over theinlet to the separator.
  • bafile plate extends forwardly and downwardly from a wall of the housing opposite the wall adjacent the means for projecting the stream of cold fluid into' the housing thereby to position the parts between the means for projecting the cold fluid into the housing and the inlet to the separator whereby the cold fluid is caused relatively uniformly to pass between the parts.
  • a machine for the definning and-deflashing of parts comprising a housing, means for supporting parts Within said housing and continuously tumbling the parts to expose different surfaces, means for projecting a stream of particulate material onto said parts in said housing, means for projecting a stream of cold gas into said housing into engagement with said parts for reducing the temperature of the parts to cause embrittlement of the thin fins and flashings whereby the embrittled fins and flashings are easily removed responsive to engagement by the particulate material, said means including an inlet plenum chamber extending crosswise of the housing above the parts and having outlet.
  • a baflle plate within said housing positioned in the path of the stream of cold gas beyond said parts to me vent channeling of the cold gas streams so as more uniformly to engage said parts, a dust collector having an inlet communicating with the housing for the removal of spent cold gas and entrained particles from said housing for the separation thereof, said inlet being positioned in said housingbeyond the baflleplate whereby the baflle" gas through 1 plate lies, in the path of the travel of the cold said housing.
  • a machine as claimed in claim 7 which includes means connecting the plenum chamber with'a source of supply of cold gas and in which the dust'collector has;an
  • a machine as claimed in claim 7 which includes a chamber surrounding the housing and means for bleeding off cold gas into the chamber for refrigeration of the chamber whereby gas entrained with the particulate'maw terial projected into the housing comprises a refrigerated gas.
  • means for bleeding off cold gas into the chamber comprises means for bleeding off refrigerated gas from the stream supplied to the plenum chamber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
US366755A 1964-05-12 1964-05-12 Machine for controlled freezing, deflashing and trimming of parts Expired - Lifetime US3279125A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US366755A US3279125A (en) 1964-05-12 1964-05-12 Machine for controlled freezing, deflashing and trimming of parts
GB16796/65A GB1073057A (en) 1964-05-12 1965-04-21 Machine for deflashing and similar trimming of workpieces
CH566265A CH430169A (de) 1964-05-12 1965-04-23 Vorrichtung zum Kühlen und Entgraten von Formteilen aus Elastomeren und thermoplastischen Kunststoffen
AT385465A AT291548B (de) 1964-05-12 1965-04-27 Vorrichtung zum Kühlen und Entgraten von Formteilen aus Elastomeren und thermoplastischen Kunststoffen
DE19651479859 DE1479859B2 (de) 1964-05-12 1965-04-30 Vorrichtung zum Kühlen und Entgraten von Formteilen aus Elastomeren und thermoplastischen Kunststoffen
SE6189/65A SE309109B (de) 1964-05-12 1965-05-12
BE663793D BE663793A (de) 1964-05-12 1965-05-12
JP40027422A JPS5231598B1 (de) 1964-05-12 1965-05-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US366755A US3279125A (en) 1964-05-12 1964-05-12 Machine for controlled freezing, deflashing and trimming of parts

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US3279125A true US3279125A (en) 1966-10-18

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US366755A Expired - Lifetime US3279125A (en) 1964-05-12 1964-05-12 Machine for controlled freezing, deflashing and trimming of parts

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US (1) US3279125A (de)
JP (1) JPS5231598B1 (de)
AT (1) AT291548B (de)
BE (1) BE663793A (de)
CH (1) CH430169A (de)
DE (1) DE1479859B2 (de)
GB (1) GB1073057A (de)
SE (1) SE309109B (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3378959A (en) * 1964-07-29 1968-04-23 Pangborn Corp Apparatus for deflashing molded goods
US4519812A (en) * 1983-10-28 1985-05-28 Aga Ab Cryogen shot blast deflashing system with jointed supply conduit
US4598501A (en) * 1983-10-28 1986-07-08 Aga Ab Cryogen shot blast deflashing system with bellows return conduit
US4648214A (en) * 1983-10-28 1987-03-10 Aga Ab Cryogen shot blast deflashing system
US4958466A (en) * 1989-03-14 1990-09-25 Air Products And Chemicals, Inc. Exhaust gas media separator with recycling and dust collection
US7918040B2 (en) 2004-03-02 2011-04-05 Nv Bekaert Sa Drier installation for drying web
US7926200B2 (en) * 2004-03-02 2011-04-19 Nv Bekaert Sa Infrared drier installation for passing web
EP2481524A1 (de) * 2011-01-28 2012-08-01 Dietmar Wacker Verfahren zum abrasiven Bearbeiten von Stück- und/oder Schüttgut mit Kälteerzeugungseinrichtung und Verfahren zum Herunterkühlen von Gas aus einer solchen
CN109159334A (zh) * 2018-07-24 2019-01-08 安徽五狼神橡胶制品有限公司 一种橡胶制品制造用修边装置
CN110421762A (zh) * 2019-06-18 2019-11-08 南京宏匡硅材料有限公司 一种橡胶制品边缘处理装置
WO2020072839A1 (en) * 2018-10-03 2020-04-09 Blast Guru Llc Apparatus and method for separating reusable abrasive media from non-reusable media
CN112140421A (zh) * 2020-09-07 2020-12-29 温州亿森贸易有限公司 一种利用橡胶制品脆性梯度不同的环保修边的装置

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041797A1 (de) * 1980-06-05 1981-12-16 Parfloor Limited Oberflächenbehandlung
DE3048893A1 (de) * 1980-12-23 1982-07-15 Linde Ag, 6200 Wiesbaden Verfahren und vorrichtung zum entgraten von elastischen formteilen
GB2154916B (en) * 1984-02-28 1987-06-03 Linde Ag Apparatus for deburring shaped components and for removing varnish layers from individual components by means of an abrasive jet
CN106696149B (zh) * 2016-11-30 2018-10-23 南京腾奇橡塑制品有限公司 一种适用橡胶件清理连接边设备
CN113103153A (zh) * 2021-04-07 2021-07-13 江西东方昊为科技股份有限公司 一种除灰效果好的喷砂房
CN113547677B (zh) * 2021-09-22 2021-11-26 启东市昶鑫环保设备有限公司 基于市政建设的塑性排水器导槽修整装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2996846A (en) * 1959-07-29 1961-08-22 Bell Intercontrinental Corp Method and means for deflashing or trimming molded rubber parts
US3110983A (en) * 1962-12-06 1963-11-19 Pangborn Corp Method and apparatus for deflashing molded resilient pieces
US3137101A (en) * 1962-12-03 1964-06-16 Bell Intercontinental Corp Method and apparatus for deflashing parts
US3160993A (en) * 1963-08-05 1964-12-15 Pangborn Corp Method and apparatus for deflashing molded resilient pieces

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2996846A (en) * 1959-07-29 1961-08-22 Bell Intercontrinental Corp Method and means for deflashing or trimming molded rubber parts
US3137101A (en) * 1962-12-03 1964-06-16 Bell Intercontinental Corp Method and apparatus for deflashing parts
US3110983A (en) * 1962-12-06 1963-11-19 Pangborn Corp Method and apparatus for deflashing molded resilient pieces
US3160993A (en) * 1963-08-05 1964-12-15 Pangborn Corp Method and apparatus for deflashing molded resilient pieces

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3378959A (en) * 1964-07-29 1968-04-23 Pangborn Corp Apparatus for deflashing molded goods
US4519812A (en) * 1983-10-28 1985-05-28 Aga Ab Cryogen shot blast deflashing system with jointed supply conduit
US4598501A (en) * 1983-10-28 1986-07-08 Aga Ab Cryogen shot blast deflashing system with bellows return conduit
US4648214A (en) * 1983-10-28 1987-03-10 Aga Ab Cryogen shot blast deflashing system
US4958466A (en) * 1989-03-14 1990-09-25 Air Products And Chemicals, Inc. Exhaust gas media separator with recycling and dust collection
US7926200B2 (en) * 2004-03-02 2011-04-19 Nv Bekaert Sa Infrared drier installation for passing web
US7918040B2 (en) 2004-03-02 2011-04-05 Nv Bekaert Sa Drier installation for drying web
EP2481524A1 (de) * 2011-01-28 2012-08-01 Dietmar Wacker Verfahren zum abrasiven Bearbeiten von Stück- und/oder Schüttgut mit Kälteerzeugungseinrichtung und Verfahren zum Herunterkühlen von Gas aus einer solchen
CN109159334A (zh) * 2018-07-24 2019-01-08 安徽五狼神橡胶制品有限公司 一种橡胶制品制造用修边装置
WO2020072839A1 (en) * 2018-10-03 2020-04-09 Blast Guru Llc Apparatus and method for separating reusable abrasive media from non-reusable media
US11440162B2 (en) 2018-10-03 2022-09-13 Blastec, Inc. Apparatus and method for separating reusable abrasive media from non-reusable media
US11813718B2 (en) 2018-10-03 2023-11-14 Blastec, Inc. Apparatus and method for separating reusable abrasive media from non-reusable media
CN110421762A (zh) * 2019-06-18 2019-11-08 南京宏匡硅材料有限公司 一种橡胶制品边缘处理装置
CN112140421A (zh) * 2020-09-07 2020-12-29 温州亿森贸易有限公司 一种利用橡胶制品脆性梯度不同的环保修边的装置

Also Published As

Publication number Publication date
DE1479859A1 (de) 1969-05-22
AT291548B (de) 1971-07-26
GB1073057A (en) 1967-06-21
CH430169A (de) 1967-02-15
BE663793A (de) 1965-09-01
DE1479859B2 (de) 1970-12-17
JPS5231598B1 (de) 1977-08-16
SE309109B (de) 1969-03-10

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