EP0188399A1 - Presse électromagnétique à pinçage prolongé - Google Patents

Presse électromagnétique à pinçage prolongé Download PDF

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Publication number
EP0188399A1
EP0188399A1 EP86630001A EP86630001A EP0188399A1 EP 0188399 A1 EP0188399 A1 EP 0188399A1 EP 86630001 A EP86630001 A EP 86630001A EP 86630001 A EP86630001 A EP 86630001A EP 0188399 A1 EP0188399 A1 EP 0188399A1
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EP
European Patent Office
Prior art keywords
nip
press
members
belt
core
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
EP86630001A
Other languages
German (de)
English (en)
Other versions
EP0188399B1 (fr
Inventor
Gregory Lynn Wedel
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.)
Beloit Corp
Original Assignee
Beloit Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beloit Corp filed Critical Beloit Corp
Publication of EP0188399A1 publication Critical patent/EP0188399A1/fr
Application granted granted Critical
Publication of EP0188399B1 publication Critical patent/EP0188399B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/06—Means for regulating the pressure
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/06—Indicating or regulating the thickness of the layer; Signal devices

Definitions

  • This invention relates to the art of extended nip presses for papermaking machinery and the like utilizing electromagnets with large area core faces coextensive with the extended nip area on at least one side of the nip maintaining a concentrated magnetic field through an opposed conforming paramagnetic nip member for efficiently creating or augmenting the nip load on the paper web conveyed through the nip.
  • this invention deals with extended nip presses having electromagnets on one or both sides of the nip with cores defining extended area shoes attracting opposed conforming magnetic nip members minimizing flux gaps between the opposed members to increase the attraction force for creating or augmenting the nip load on paper webs or the like conveyed through the nip.
  • Extended nip presses for papermaking machines are known in the art, for example from the disclosures of the Busker et al United States Patent 3 738 225, issued July 24,1973, and the Justus United States Patent 3 783 097 issued January 1,1974.
  • impervious belts convey the web through an extended wide nip created by hydraulically loaded shoes or pads.
  • Roll presses with electromagnets in one roll attracting an opposing roll to create a nip load are also known, for example, from the disclosures of the McClenathan United States Patent 3 456 582, issued July 22,1969.
  • an extended pressure nip for dewatering or calendering fibrous webs such as paper, is formed by magnetically attracting a wide shoe on one side of the web and a wide conforming paramagnetic member on the opposite side of the web which may take the form of a roll or a pressure shoe.
  • the magnet core is coextensive with the wide nip area, forms or intimately supports the shoe and develops a concentrated magnetic field across the entire nip area. The field flux only traverses a minimum path to the opposed nip member.
  • the web is conveyed through the nip by an impermeable belt and may be covered on one or both faces with an absorbent felt in dewatering press installations or may directly engage a hard finishing roll in calendering installations.
  • the nip forming component on one side of the web is shiftable under the influence of the magnetic flux created by the energized electromagnet.
  • either the shoe or the roll is shiftable and in installations having electromagnets on both sides of the nip either one or both of the magnets may be shiftable.
  • a feature of the invention is the minimization of the gap through which the magnetic flux must pass to establish the nip load. This is accomplished by forming the pressure shoe with the electromagnet so that the - flux does not have to pass through a surrounding roll before reaching the paramagnetic nip forming member on the opposite side of the web.
  • the shoe and opposed member have coextensive wide large areas increasing and concentrating the magnetic inductance to more effectively pull the two sides of the wide area nip together.
  • Another feature of the invention is the provision of individual electromagnetic cores along the length of the nip to compensate for any irregularities in nip loads caused by deflection, uneven expansion and the like, of the components.
  • a still further feature of the invention is to provide individual coils for the electromagnetic cores which are adapted to be individually energized to control loads along the length of the nip.
  • a further object of the invention is to provide dewatering presses and calenders for papermaking machines with wide extended magnetized nips establishing nip loads by magnetic attraction.
  • a further object of the invention is to provide a press roll assembly with an electromagnet energized shoe forming an extended nip with a cooperating magnetic roll and having a minimum gap between the electromagnet and the magnetic roll.
  • Another object of this invention is to provide an extended nip press for papermaking machines where the wide area nip is formed by opposed electromagnets enhancing magnetic coupling of opposed rigid nip members.
  • a still further object of the invention is to provide an electromagnet edtended nip press where the press loads are created by concentrated flux lines between opposed conforming wide area rigid nip members.
  • the extended nip press assembly 10 of Fig. 1 has an electromagnet 11 on the bottom side of the wide or extended nip N, and a ferromagnetic top roll 12 on the opposite side of this nip.
  • An impermeable belt 13 is trained in an open loop around rolls 14, one of which can be driven as shown at M and another can be biased as shown at B to tighten the belt.
  • An external roll 15 guides the belt in its path having a top run through the nip.
  • a porous felt 16 is trained around rolls 17 through the nip and receives the bottom face of a web W as it passes through the nip.
  • the ferromagnetic roll 12 rotates about a fixed horizontal axis 18.
  • the electromagnet 11 is slidably mounted in an open top fixed trough-like housing 19 and the top face of the electromagnet is covered with an arcuate non-magnetic thin sheet shoe 20, preferably formed from a sheet of stainless steel.
  • This shoe 20 slidably supports the impermeable belt 13 and a shower pipe 21 ejects lubricating fluid between the shoe 20 and belt 13 at the entrance to the nip N.
  • the electromagnet 11 is formed from a plurality of iron or magnetic steel core blocks 22 in side-by-side relation.
  • the core blocks 22 are rectangular in shape with a flat bottom 23, flat parallel sides 24 and a transversely convex top 25.
  • the blocks 25 have flat faces 26 adapted to slidably mate in side-by-side relation as illustrated.
  • Each block 22 also has a pair of spaced side-by-side open top slots 27 extended between the opposite faces 26 thereof. These slots terminate above the bottom 23 of each block. An electromagnetic coil 28 is wound through the slots 27 terminating below the top 25 of each block and extending beyond the end blocks as shown.
  • the slotted convex tops 25 of the blocks are covered with the thin non-magnetic shoe 20 which is curved to seat snugly on the tops of the blocks and which also has downturned lips 29 extending over and beyond the sides 24 of the blocks so that the impermeable belt 13 will be smoothly guided into and out of the nip N.
  • the open top trough-like housing 19 is fixedly anchored and extends across the full length of the press assembly 10 inside the loop of the belt 13.
  • the electromagnet 11 slides vertically in this housing and the sidewalls 24 of the magnet blocks 22 are slidably guided by the sidewalls of the trough and sealed to the trough by seals or packings such as 30.
  • a sealed chamber 31 is provided between the bottoms 23 of the blocks 22 and the bottom of the trough and this chamber may receive hydraulic fluid under pressure from a pressure source 32 to force the electromagnet 11 and its cover 20 upwardly from the housing 19 to establish initial loading of the nip N.
  • Other means for raising the electromagnet 11, such as screw rods, springs, or the like could be provided to hold the cover 20 against the impermeable belt 13 and to establish the initial loading of the nip.
  • the coil 28 is energized from a generator G or the like power source through a resistor R controlling the amplitude of the current to create inductor excitation of the electromagnet establishing a controlled flux, drawing the slidable electromagnet and its cover shoe 20 toward the magnetic roll 12 and establishing the desired nip loading. Since the cover 20 is supported on the core blocks 22 and since these blocks are relatively slidable, irregularities in the nip contour due to sagging, heat expansion and the like will be neutralized and the blocks will maintain a uniform loading along the full length of the nip.
  • the ferromagnetic top roll 12 instead of being mounted on the fixed axis 18 of the Fig. 1 embodiment, is mounted on an axis 18a supported from a hearings carried by swing arms such as 40, pivoted about a center 41 and actuated by hydraulic or pneumatic cylinders such as 42.
  • the roll 12 is thus raised and lowered relative to the nip N.
  • the electromagnet lla instead of being shiftable in a support such as 19, is fixedly mounted on a support 19a.
  • the electromagnet lla has a single core block 43 with a central open top slot 44 receiving one leg of an electromagnet coil 45.
  • the coil 45 thus envelops only one side of the block 43 and has one leg lying in the slot 44 while the other leg is wrapped around an outer side face of the block.
  • the top of the coil is below the slotted convex top 46 of the block and the cover 20 is supported on this slotted top 46.
  • Initial loading of the nip N in the press 10a is accomplished by actuating the cylinder such as 42 to pull the ends of the arms 40 forcing the bearings for the axis 18a downward into pressure nip relation with the cover 20.
  • the desired nip pressure is then established by energizing the coil 45 creating the magnetic flux which pulls the ferromagnetic roll 12 to the core 43 and establishes the nip loading.
  • the web is conveyed through the pressure nip on the impermeable belt 13 which slides over the shoe 20 and the felt 16 covers the bottom face of the web in the same manner as in the press embodiment 10.
  • the nip loading can initially be created by forcing the electromagnet core against the shoe 20 on one side of the nip or by forcing the roll 12 toward the shoe on the opposite side of the nip and then energizing the electromagnets to create a dense concentrated magnetic field through the entire nip area pulling the magnet and roll together to create the desired augmented nip load.
  • a double-felted press is provided with the web passing through the nip N between the bottom belt 16 and a top felt 50 which is wrapped around the bottom of the roll 12 and directed by guide rolls 51 to meet the web W as it enters the nip N and to leave this web as it exits from the nip.
  • the roll 12 is circumferentially grooved as illustrated at 52 forming channels for the flow of water out of the nip N as shown in Fig. 10.
  • the impermeable belt 13 may be longitudinally grooved as illustrated at 53 in Fig. 11 to form channels draining the water out of the nip.
  • the press 10b may have the shiftable roll 12 and the fixed electromagnet lla of the press 10a in place of the fixed roll 12 and the shiftable magnet 11 of the press 10.
  • the extended nip press 10c of Fig. 4 includes components the same as those illustrated and described hereinabove and the same reference numerals have been used to identify the components.
  • the roll 12 is replaced with the shiftable electromagnet 11 and the trough support housing 19. This magnet slides in the housing 19 and acts through the shoe 20 to form the top face of the extended nip N.
  • a top impermeable belt 60 trained around guide rolls 61 and a drive roll 62 in an open loop surrounding the housing 19 has a bottom run extending through the nip under the top shoe 20.
  • a fixed lower electromagnet lla is surrounded by the looped bottom impermeable belt 13 riding over the bottom shoe 20.
  • the web W is conveyed through the nip between the belts 13 and 60.
  • Lubricant can be fed between the belts and shoes 20 at the entrance to the nip.
  • the top electromagnet 11 can slide by gravity in the housing 19 to create an initial nip lqad.
  • the initial load can be increased by hydraulic fluid, springs, or mechanical screws forcing the electromagnet 11 out of its housing 19 as described in the Fig. 1 embodiment.
  • the fixed bottom electromagnet lla can be in the form of the single core end coil 45 with the external leg as shown in Fig. 7 or can be constructed as shown in Fig. 6.
  • the bottom belt 13 is conveniently driven by a driver roll 63 with a superimposed nip loading roll 64, the belt passing through the nip between the rolls 63 and 64.
  • a fibrous absorbent felt 65 is also provided between the top belt and the web W.
  • the press 10d of Fig.5 illustrates a calender roll embodiment for surface finishing a dry web D.W. threaded through the nip N between a calender roll 70 rotatable about a fixed axis 71 and a shiftable electromagnet 11 carried in a housing 19 is described hereinabove.
  • the electromagnet 11 is covered by the non-magnetic shoe 20 described hereinabove which in turn receives the impermeable belt 13 conveying the web D.W. through the nip N. Controlled energization of the electromagnet 11 creates the desired calender nip loading for treating the dry web D.W.
  • an electromagnetic loading of the shoe 20 for an extended nip press or a cdander press as described hereinabove can be created by a modified electromagnet arrangement 80 composed of a plurality of electromagnet core blocks 81 each having its own individual exciting coil 82.
  • the magnetic iron or steel core blocks have open top parallel slots 83 receiving the coil 82 with the ends of the coil projecting from the open ends of the slots.
  • heads 83 are provided on the blocks extending beyond their front and back faces. This provides gaps or spaces 85 for the coils 82 without opening up wide gaps or spaces under the cover 20.
  • each of the coils 82 can be individually energized from a power source 86 through controls 86a to vary the input to each coil as desired.
  • the cores 81 spaced along the length of the nip can exert selective loads on increments of the shoe 20 to compensate for variations in nip pressures caused by sagging rolls, non-uniform expansions, etc. along the length of the nip.
  • any gaps between the nip and the magnetic cores are minimized since the cores only act through very thin non-magnetic shoes 20 to establish the flux lines creating the attraction with opposed ferromagnetic rolls or cores. Further these flux lines only have very short paths between opposite sides of the nip and are concentrated over the complete nip area without passing through air gaps which are formed in all line presses at the entrance and exit sides of the nip.
  • the extended nip area has a width controlled by the width of the shoe and all of this area has a magnetic field passing directly therethrough without going through an air gap, although a very small gap will be formed by the non-magnetic material going through the nip.
  • the press 10e of Figure 12 provides a series of nips N successively receiving the web. Components similar to those shown in the presses 10,10a, 10b and 10c of Figs. 1-4 have been marked with the same reference numerals. As shown, the press 10e has three nips N, each defined by a roll 12 and a shiftable electromagnet 11 in a trough housing 19 with a thin non-magnetic shoe 20 covering the core blocks 22 and a pressured chamber 31 urging the magnet and shoe toward the opposing roll to establish an initial nip load. Each roll 12 has a separate press felt 90 wrapped therearound through the nip N provided by the roll and opposed shoe 20.
  • Each felt 90 as illustrated on the third roll 12 is looped around rolls 91, one of which can be driven as shown at M.
  • An external stretcher roll 92 keeps the loop taut and an external guide roll 93 keeps the felt on path around the roll 12, through the nip N and around the rolls 91.
  • a single impermeable looped belt 94 has a top run through all three nips N, around a drive roll 95 beyond the last nip N, around rolls 96 back to the front nip N and over a guide roll 97 along a bottom run thereof.
  • the magnets 11 can be energized to exert increasing nip loads in the successive nips N.
  • the rolls 12 of the press 10e can be replaced with electromagnets 11 as in the press 10c of Fig. 4.
  • a porous metal belt (not shown) can be used to replace the felts in the presses 10, 10a, 10b, 10c and 10e to thereby further reducing the non-magnetic gaps between the opposite rolls of the nips. Further the shoes 20 in the presses and calender stack arrangements can be eliminated to reduce the gaps, but because they are very thin, serve to keep the lubricating fluid away from the magnetic coils, and smooth out the nip surface, they are a desirable addition.
  • a press roll 12a for the presses of this invention can be provided to minimize eddy current heating of the nip.
  • the roll 12a has a cylindrical steel core 98 with end heads 99 carrying axles 99a to rotatably support the roll.
  • the core receives a stack of thin laminates 100 therearound and squeezed together by the end heads 99.
  • the stacked laminates 100 are washers about 0.01 to 0.051 cm thick and about 5.08 to 7.12 cm wide. They fit snugly on the core 98 and are composed of metal which does not develop eddy currents in the magnetic field generated by the electromagnets. Such eddy currents are created in conventional magnetic materials and heat the roll when it is driven through the magnetic field. When heat is not desired, laminated rolls such as 12a are used.
  • Useful materials for the laminates are oriented silicon iron forming an oxide coating on the surfaces of the thin washers 100, noncrystallines or amorphous ferrites and the like.
  • Fig. 14 illustrates the increases in attractive magnetic forces made possible by diminishing the gap through which the magnetic field must pass.
  • the attractive force greatly increases as the gaps decrease from 1.91 cm down to 0.32 cm.
  • Extrapolating the 0.32 cm curve to 14000 amp. turns shows that the electromagnets used in the extended press nip assemblies of this invention are capable of producing a force of 90 kilos per linear centimeter and that about twice this value can be achieved with two mutually attractive magnets as in the press assembly 10c of Fig. 4.
  • the stacked heights of the non-magnetic shoes, belts, felts, and webs in the nips N of the presses of this invention only result in gaps of 0.127 cm to 0.914 cm between the magnetic cores and the ferromagnetic rolls or the opposed magnet core.
  • the impermeable belt can ride on the lubricated core legs of the electromagnet eliminating the shoe 20.
  • the shoe helps to keep the lubricant fluid from the coils. In such assemblies the shoe would only have a thickness of not more than about 0.32 centimeters each belt would have a thickness of 0.051 to 0.254 centimeters and, of course, the thickness of the webs would be negligible in the order of 0.005 to 0.025 centimeters.
  • the impermeable belts are preferably composed of rubber or a plastic material such as polyurethane, but could be thin impermeable metal belts further reducing the non-magnetic gaps.
  • the felts as explained above, can be replaced by thin porous flexible metal belts into and through which the expelled water can flow and still further reduce the gaps.
  • the shoes 20 can be any non-magnetic material such as hard rubber, plastics material, stainless steel or the like.
  • the machine direction width of the shoe can vary to suit conditions, but is wide enough to develop a large area magnetic field. A reasonable minimum width is about 10.16 cm with anaximum of about 45.72 cm.
  • the cross machine direction width of the shoes can vary from narrow up to the full width of the machine.
  • the full width shoe should be flexible with cross machine direction to conform to irregularities in the belts, felts , web and mating faces of the roll and magnet core. If desired the shoes can be spaced up to 15.24 cm apart.
  • this invention provides extended nip presses for treating wet or dry fibrous webs wherein nip loading is created or augmented by electromagnets having cores acting only through minimum gaps creating the flux lines across the entire wide nip area which pull opposite sides of the nips toward each other to establish the desired nip loading throughout the entire width and length of the extended nip.

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  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
EP86630001A 1985-01-08 1986-01-06 Presse électromagnétique à pinçage prolongé Expired EP0188399B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US68980085A 1985-01-08 1985-01-08
US689800 1985-01-08

Publications (2)

Publication Number Publication Date
EP0188399A1 true EP0188399A1 (fr) 1986-07-23
EP0188399B1 EP0188399B1 (fr) 1989-10-25

Family

ID=24769937

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86630001A Expired EP0188399B1 (fr) 1985-01-08 1986-01-06 Presse électromagnétique à pinçage prolongé

Country Status (13)

Country Link
EP (1) EP0188399B1 (fr)
JP (1) JPS61174494A (fr)
KR (1) KR890000820B1 (fr)
CN (1) CN1006916B (fr)
BR (1) BR8600047A (fr)
CA (1) CA1249470A (fr)
DE (1) DE3666598D1 (fr)
ES (1) ES8705548A1 (fr)
FI (1) FI85521C (fr)
IN (1) IN165321B (fr)
MX (1) MX160381A (fr)
PH (1) PH24538A (fr)
PL (1) PL148514B1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988008051A1 (fr) * 1987-04-14 1988-10-20 J.M. Voith Gmbh Machine pour produire des bandes de materiaux fibreux
US5836242A (en) * 1994-06-15 1998-11-17 Albany Nordiskafilt Ab Calendering system including a belt having an adaptable web-contacting surface
US6007921A (en) * 1992-10-09 1999-12-28 Champion International Corporation Continuous finishing belt capable of finishing surface of a web of paper
WO2000047815A1 (fr) * 1999-02-09 2000-08-17 Sgm S.P.A. Calandre avec dispositif magnetique pour regler la pression de contact entre les rouleaux
US6203307B1 (en) * 1997-08-28 2001-03-20 Champion International Corporation System for finishing surface of a web of paper having an improved continuous finishing belt
DE10157686A1 (de) * 2001-11-24 2003-06-12 Voith Paper Patent Gmbh Kalander und Verfahren zum Glätten einer Papier- oder Kartonbahn
CN112519072A (zh) * 2020-11-23 2021-03-19 德清新源恒塑料科技有限公司 一种聚四氟乙烯薄膜压延机

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19613878C1 (de) * 1996-04-06 1997-06-12 Voith Sulzer Finishing Gmbh Kalander für Papier o. dgl.
CN105789499B (zh) * 2016-04-26 2019-08-13 福建南平南孚电池有限公司 一种碱性电池密封圈
CN113463425A (zh) * 2021-06-03 2021-10-01 江辉辉 一种可以调节纸张压榨程度的造纸机保护装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067718A (en) * 1958-11-05 1962-12-11 Johannes Zimmer Maschf Apparatus for treating sheet materials
US3456582A (en) * 1966-09-29 1969-07-22 Beloit Corp Crownless electromagnetic press roll loading
US4482430A (en) * 1982-04-01 1984-11-13 Oy. Tampella Ab Extended nip press lubricating system for a paper machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067718A (en) * 1958-11-05 1962-12-11 Johannes Zimmer Maschf Apparatus for treating sheet materials
US3456582A (en) * 1966-09-29 1969-07-22 Beloit Corp Crownless electromagnetic press roll loading
US4482430A (en) * 1982-04-01 1984-11-13 Oy. Tampella Ab Extended nip press lubricating system for a paper machine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988008051A1 (fr) * 1987-04-14 1988-10-20 J.M. Voith Gmbh Machine pour produire des bandes de materiaux fibreux
US6007921A (en) * 1992-10-09 1999-12-28 Champion International Corporation Continuous finishing belt capable of finishing surface of a web of paper
US5836242A (en) * 1994-06-15 1998-11-17 Albany Nordiskafilt Ab Calendering system including a belt having an adaptable web-contacting surface
US6203307B1 (en) * 1997-08-28 2001-03-20 Champion International Corporation System for finishing surface of a web of paper having an improved continuous finishing belt
WO2000047815A1 (fr) * 1999-02-09 2000-08-17 Sgm S.P.A. Calandre avec dispositif magnetique pour regler la pression de contact entre les rouleaux
US6349637B1 (en) 1999-02-09 2002-02-26 Sgm, S.P.A. Calender with magnetic device for adjusting the contact pressure between the rolls
DE10157686A1 (de) * 2001-11-24 2003-06-12 Voith Paper Patent Gmbh Kalander und Verfahren zum Glätten einer Papier- oder Kartonbahn
DE10157686B4 (de) * 2001-11-24 2005-11-17 Voith Paper Patent Gmbh Kalander und Verfahren zum Glätten einer Papier- oder Kartonbahn
CN112519072A (zh) * 2020-11-23 2021-03-19 德清新源恒塑料科技有限公司 一种聚四氟乙烯薄膜压延机

Also Published As

Publication number Publication date
CN1006916B (zh) 1990-02-21
KR890000820B1 (ko) 1989-04-08
PH24538A (en) 1990-08-03
KR860005935A (ko) 1986-08-16
PL148514B1 (en) 1989-10-31
JPH0219237B2 (fr) 1990-05-01
CA1249470A (fr) 1989-01-31
PL257394A1 (en) 1987-04-21
BR8600047A (pt) 1986-09-23
DE3666598D1 (en) 1989-11-30
CN85108792A (zh) 1986-11-05
IN165321B (fr) 1989-09-23
FI85521C (fi) 1992-04-27
ES8705548A1 (es) 1987-05-01
MX160381A (es) 1990-02-14
ES550697A0 (es) 1987-05-01
FI854845A (fi) 1986-07-09
FI854845A0 (fi) 1985-12-09
EP0188399B1 (fr) 1989-10-25
FI85521B (fi) 1992-01-15
JPS61174494A (ja) 1986-08-06

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