DE2012649A1 - Sleeve for an inking roller and method for mounting the sleeve - Google Patents

Description

M 2783

Minnesota Mining and Manufacturing Company, Saint Paul, Minnesota 55101 '(Υ * 8ΐ τ Δ)

Sleeve for an inking roller and method for mounting the sleeve

This invention relates to whales and in particular a removable sleeve for such orphans and a method sum Aufsieaea the sleeve on the orphan's body * This sleeve will Yorsugsweiss aergesteiled from solid, generally in the form of τοη Sheets or strips of coverable polyurethane in one

or in a similar Mtalwerk x * rklt * can become inert, This material differs τοη a liquid Gu * epolj »« r, the »le liquid can be referred to ksmx and in the at - viscous. Iltieisiiktites. the usual way "is hated"

000840/1433

The conventional Farbauftrag- or pressure roll consists of a shaft with a cylindrical extension in the middle, the bauftragbelag with a rubbery ^Fai% Teraehen iet, for example by coating or wrapping, which covering is then cured at the Grebrauclxaatelle. Over time, the diesel surface wears off and must either be replaced to samräen with the roller, or the part) on the wing must * be renewed in general by sanding. This grinding can only be carried out once or twice, although it is more economical than in Srsata in such cases, despite the fact that the printing machine has to be put out of operation for a long time. If the covering can no longer be sanded down, the printing surface must be replaced, generally outside of the factory Opportunities, however, which are generally unsuitable or too expensive to have practical value *

In addition to natural rubber, pressure roller bodies have been used for several years Polyurethane used (Inland Printers / American Lithographer, December 1966, pp. 56-57 * George Brawata "Care and Maintenance of Offset Press Rollers "); however, these materials consisted of liquid ghas ep elysate The high adhesion achieved by rollers is particularly suitable for letterpress printing, in which inks with lower adhesion are used. The use of these rollers in lithography printing was unsuccessful, however, since the Hitee produced in the farbwerk die Tried to dry out the ink on the rollers. Because of the high Abrasion resistance of these materials is an abrasion of the Surfaces difficult. In the case of polaurethane whale bodies, there is also ventilation nor the danger that the polymer will liquefy, whichever gen * Fahr is less large with the ftbachleifb & xen polyurethanes.

The b "in Abeehleifen wad at d * r renewal of pressure faces difficulties encountered au TeriseldeJij were removable sleeves Torgeaehlagea- ^ or the Irfladung had aolche Htileen limited success h" uptβfahlion because of müh-β fts' s method, itn b ^ i t $ m * v £ .'4i »h * n der Μ '*. 1 * # * uf den

0 0.9 δ ', -; / ' U 3

■ - 3 -

Roller bodies had to be applied, and maybe also Because of the great difficulty, the lateral position of the sleeve to maintain the roller body when lateral shear forces occur in use. To eliminate this difficulty Numerous attempts have been made * but the result was by no means entirely satisfactory.

In an older experiment, an elastic rubber sleeve was used mounted on a roller, the outside of which was sanded down again so that it was even »(US Patent 1,926,312) This roller was provided with tapered indan, which should prevent a longitudinal movement of the sleeve »In the However, practice has shown that this type of sleeve is due sliding in the longitudinal direction was unsuitable »

Rubber sleeves have been used with some success along with special Rollers used «One of these rollers had a rubber body on, which merges radially in a vacuum, so that the Sleeve could be pushed onto the roller and received a tight fit with the roller when it was later expanded and could no longer move laterally * Another design uses a special roller with a removable sleeve used that rush to the use et on one always used Mandrel is held at both ends by a Hans anyway (US Pat. No. 2,814,855) · These specially designed rollers are generally more expensive, and operate with no facilities to renew the rollers that do not have this special construction

The sleeves of the type described were made of elastic Rubber (U.S. Patent 1,926,312), vulcanized rubber (U.S. Patent 3,184,355) and a polyester resin (U.S. Patent 3,090,106)

The invention relates to a sleeve, the outside of which any application surface can be used for a pressure roller, and the one on a hollow cylinder ai'ia a sandable polyurethane consists·

The invention provides a method for mounting printing parts on the roller body, which process is characterized by the fact that the sleeve © in a zylindruech®? shape

ÖÖ984Ö / U23

OR / ÖfNAL / NSPECTED

Each of the properties 3 are files lay around a shell 3, the bottom of the cylindrical shape 4, where & ureh & - ^ Smfträum 7 - ■■■ is closed, which is evacuated with the help of a suction pump connected to the Eohr & Biiatss 5 .

The Mg, 4 shows the sleeve 5 slash of the evacuation, the aim-- more of a clear width, which exceeds the circumference of the -B ^ mok. The outside <ä @ r 3) j? UolEwalze 2 is geaan syllm - drisch ztirechtgesöhliffea «you 3) ruckwaLz @ 'will- & smb. Isäie it panded pod- 3 eis.gese: .2 © i3 © ne Haoli Aufiiefemig d «ss -falsm'öS the pod in the © niispamr & e ^ 2mstand suruclcsukelires xmd l © gt is tightly attached to the AiaS side" of the whale © aa _s - ö @ r © a diameter larger @ r is sis di # height © width of the HtSliss © - ia τ © 11 «constantly relaxed condition Pie Üfeerlapp-ongea β (I ¹ Ig ₀ 3) ^T J? srd © B, then removed, u && the zylteärisohe form 4 is deducted from »i @ s? Wals ©. ■

The ends of the Hüls® (9) © rstr @ s & en see iifcw dl © laS @ a ä @ s? Print roller 2 out (Ug ₀ I) ₅ sa äass Eick asi dies © si ICgatea Iseiia! Dye anaaraaslii kssm ₉ d @ s? la äea Swisoh ^ n ^ aum sir / is © hsia des? Sleeve and the ¥ alsenkSrp © 2? © iadrlagsa kSmite * lia @ sol © ha roller is therefore aiieli l © i © 3at © r ssu reiaigea _Q -

In the production exerts @ t £ iaduagsgemäßen sleeve © is © grüadlieh break into vermahlungsfähiges resistant polyurethane elastomer and eat © ia @ r QvwmimWsl® od ©! ⁵ © iner äknlie'äga liax-i @ h-. J

tion with aPiastiflisieinEigsmitt ©! and one mixed, after which the cream sauce becomes an ifeterialbaim. "May th gewüasohtün in fmrilgm sleeve the <J © ai" ö & Filler @ _r Terdttmnmgsmittel _r catalysts and modifi ^ a ^ iGEßaittsl Žuja Yevete ± £ s. _$ Ken, for Irhöhen &"a® Abrieöwiderstaadee uad" Depending on the the 2ugf © are added · Biis? ^; 5? H Xnfwl ^^ ln this lat®pialbate, "on © iaeia Meteildorn is made d * sm gsia Eoäl ^ ylimder iaad äanael.

cured-under Ansüfeung © iaea Sruckes ^ on the AiiSeaeeit® Mät help of a Aushartaimgsgswisibeto-a & e "waa anrok Irhltaaa vest her" by means of steam _t ä & ÄiaröJi atm

is directed, or as. gee-s ^ y ijiosidaimf is © iaesi so long heated _f If, © ^ ₉ ^ © IXsti

G Q 9 S 4 Ö / -U 2 3 ORK51NAL INSPECTED

After hardening, the rubber sleeve carried by the mandrel becomes accurate cylindrical, ground. Then the sleeve is turned inside out, so that »their inner unprocessed side to the new work surface for a platen will.

The read sleeve on the pressure roller is shown in the White carried out, that it was inserted into a cylindrical shape provided with a pipe socket or other means by which an evacuation can be carried out. This cylindrical shape must be so powerfully designed that it is not compressed during evacuation. By turning the ends of the sleeve over the ends of the cylindrical shape a closed air space is created between the inner wall of the cylindrical shape and the outer wall of the sleeve. The cylindrical shape is of course shorter than the rubber sleeve, so that their ends can be turned inside out.

There are, of course, other possibilities for the creation of closed air spaces. Where the zy_ lindrisch "m? Orn>Ιτο'ηκ-ta the üfcerlappungsverfahren be applied one end, währeM on. Other Br \ <5 .e Oer form is used a cap The cap 1ET in the middle provided me an opening through the calibration sleeve "in Heibsitjs ~ * Xt the inner edge of the opening hindurchers treckt".

The completed Luicrauui is then using a vacuum pump © ocer a <uc ^: ■ er. Facility evaloiiert, which has a pipeline with dom ^ ohr ^ nöata! on the wall of the cylindrical por © ± xx ^ e.rbinrlun ^ fr.! ⁴ : At. During evacuation, the sleeve expands radially aue ur-ü ? ■? $?. * Ί a · gr8J3 «: - e light * width. The evacuation is forgoi-rt "-t _r until the light" rteite is larger than the circumference of the ^ ru ^ teiCsr.tr .. on the hull is absorbed.

Before the tau ilulst is drawn up, the pressure roller should be grinded precisely cylindrically . Sleeve eiiiguschoDeü _f aad the atmospheric air is let into the & hgeechlo6 »« »su • öv & iiulertsii Lauftraua again. The sleeve versa lu ^ r ui in ä% n ent ^ paimten state to back: and sets look ® "~ w '.Ji» • s ^ ^ ite -sae the orphan at. Since the

0 bb 4 ü / 1 4 2 3

ORK3INAI. INSPECTED

the Walsse is larger than
e & encased sleeve * so feeim Sckrsspf © ad © i · Hi! © © © la

! © ifeaitz mili der ^: orphan made © la © a-öspusatea Imsstaai, sleeve should: leren IJanen & irelMaess ©! ⁰ aiat @ eteas-IQfS vm &: ve> sgm.§ &<=> wise 15 $ .be smaller than the walg © säTO € & s © 0S © 3? O «Γ © g ^ ÜQg ¹ lio! Difference- between this a @ id © a BsS ¹ QMaOgθ © sm is _s "ii £. g ©! j © 0S33? becomes "slar S'ita the sleeve spf the WaIsQ ₅ selasig © ü ©.!" Us © s? siisl θ © far ex: p © mdiert werdaa. kama ^ iaso oil © W © is © oiBSQ'talai ^ is ta lies © lx: pae.; 3i © J3L may aatlrli © fe was θ © - t / ei-t tiKeAgoflMsit tjes-äesa-ß wl © © s the strength € © £ · Mis © sralassto l @ i € i @ oea ^ BasIqI ^ fa & reiä. m ues ■ natural dsi2? amf g © aeM @ tw © 2? tca _P flags a firm Sitss äex Hüls® aiaf that? ¥ slss @ 2? Si9lo? -Biä ti © pljsikalisch © featigkgit & qs? HtIs © © 'öf ^^ eiB.tegö.ol'ö'SB wi5f ZsR-allg @ saeis © n kaan eis © lsgaasi © af © a 1 © ^ Fels "'« isa ^ fÜiE · 350 Ton 15 ^ ^ is 30 ? a

3) ± © whale

άΘ2? ■ i'iäaiiif !! © lao von. we & igoir als 25 eaMi sm asLiS? al © SOO ea ^ BqI sadarea BriiclrreEieSi ^ oa kdaa © a ti © © ® i ^ eas ^ esrgo l ^ es'sehs'i'ö'isc Iterehis. @ Sse2f% @ i @ i © ^. f © a 5. ^ is- 9 © a iasi tsisli oiao SKIl-

esi ti © S

S © 3? ₉ 5 © diBaer die EtJi2o © & uastoäg io- ^ o WIq @ 'ö © so Cfeean © ftli ³ iio Bi © k @ will <ladur © k fbcDbgQOotSöp iass S, ± g Sö

in 7afos®ä ai®M B © te

with ä®T & t & 2f liaiaoa g ^ asosaoaoö'Ss ^ Bi qIeo Eoi® «f © sliiglielt * ^ © 3a msto sie -aagofife 8 ^, 8 ii.g/@B © g'glb ^ o DiQa © © s? < Bi © 12® is matfeliela Jo a © © & ä © a ^ öguoEiäQ ^ oa 1 © Xpios?

utes ⁵ fi © ia © a, ti © SISIdq M

To a runaway Issäftigoa Ii-Ss äes? HUSqq q® £ Iqs> üqId iie ^ sustellea »shall öis Klloo @iaQ Hia-äoatopasiaimg ^ © a 5 _S 3 feg / cm ¹ " In the HQle @ sol ^ ot Qiafuölsoa ¹ ^ a äioeo oM long? © time maintains ©! ! © you Hillao a ^ Qo f qssqs? © imoa §Qt7ioooa örad von, SäJiigkeit "aiäff? € ii0 © a _y taait sio Ib © olsmiaeia qm £

0 0 S a 40/14 2 3- 0RK3INAL INSPECTED

Do not eat up and with some overload does not tear · you on the Orphan wound sleeve must be smooth, abrasion-resistant, resistant to ozone and have adequate surface adhesion.

The holding tensile force is determined according to the 255 ^ module, which is a measure of the stress in a 25 ^ igen tendon. Under most operating conditions on the printing presses and for the printing inks used, a tensile strength of at least 7.0 kg / cm is desired. The retention of the holding force is related to the compression or tension that has been achieved after curing. In the final compression, a value of less than 25 # is desired, the -S395-61 test method B is determined at a 22-hour treatment at a temperature of 7O ⁰ C by the ASTM. You toughness is a combination of the tensile strength, the tendon and the tear strength · You sleeve should preferably have a tensile strength

of at least 140 kg / cm, a tensile strength of at least 400 # and a tear strength of at least 8.8 kg / cm and preferably 10.5 kg / cm according to ASTm S624-54-Sie C. When the bite resistance approaches 8.8 kg / cm, this is how difficulties arise. The fluctuations in tear strength depend on the particular polymer chosen and the particular ones Terms of use. A glass-like smooth exterior is desirable to avoid possible difficulties in transferring the Avoid printing ink as a result of uneven contact with the printing plates or with other rollers · You can avoid smoothness of the cured mixture can be compared by expanding a thin test piece in the area of use of the sleeve (15 - 20 *), with any knot formation or willingness is determined, which inclines on the surface. A knot formation or waviness is often found in reinforced and oil-resistant polymers, such as chloroprene or Hitr11, but not capable of grinding according to the invention Urethane.

In the examples below, information is given on the manufacture of the sleeves and their performance. Si «in the

0098A0 / U23

in front of the sharing description given Pi-üf data wmrasä received. "at an Eeaperatur of 20 ° ö and a relati ^ ability of 50 ^ »if not specified anieree ^

- ■: - -B; e 1 a η iel -X-

Sleeves for pressure rollers were made from the following materials ! . ^: ■ "" ..- '".--.'. - ■ '■"-,' V- ■■ -. "'- ..; ■■ - ^ \' ^r

WQ ₉ 2'V V. V ν ο, = ° ■■. '? ■ ■ "■ - o,; ·. ο; ^; "■} '■ ■ -. :. ■ "■ 13 ,.

Grindable st polyurethane elastomer (1) stearic acid

semi-reinforcing KohleruiS calcined aluminum silicate (2) frikresy! phosphate Dicumyl peroxide (40 ^ active) '(J)

(1) available under the trade mark Genthane SE

(2) in the «Polyfil Caay

(5) ⁿⁿⁿ Tue Cup 40 €

The mixture was produced by means of a Mfeora \ toriumsgummiinühle with the dimensions 15 x JOcmj which was equipped with internal water cooling »The polyurethane elastomej? was passed through the gap with a fin opening of approximately 0.25 ohms without kneading the polymer. -The; Sumal Wurd © Dana to, a roll left, and the opening was on a Minde @ t ~ rolled strip is set to 1.3 cm with a diameter of 0 _f. 6 . (|. In the gap stearic acid was added and dispersed by alternately cutting of the material from both sides Thereafter, the gap of the calcareous clay was slowly added and then approximately half dee Plaetfizieru "gsmittels ₀ 'after a good gleiehmäßige dispersion is istp obtained the The tape is cut off again alternately from both sides, folded over and guided back into the gap in order to achieve an even thickness of the durum within the thickness of the tape Addition of the mixing process described above is repeated. After a uniform mixture has been carried out, the hardening agent is carried out

008840/1423

mixed, pie entire batch is then cut off the roller and curled up in a solid hulm. This bullet is then passed vertically through the gap, and certainly one to achieve good dispersion. The opening is then adjusted so that a tape thickness of 0.088 to 0.1 cm is obtained. That After leaving the processing device, material is cut into a single material web. The material will on a silicone-coated paper to cool down f However, a removable surface can also be used, or the material web can be hung up to dry in the air.

The sleeve is then molded onto the curing dome, which is made from 48 cm long steel tube that is polished and has an outside diameter of 4,699 cm. A 36 cm long rubber sheet is cut into shape and cut in two layers with a small excess onto the mandrel wound up. The rubber is placed an ^e om 0.005 thick polyester film to protect the Auehärtungematerial and a sticking or pressing to avoid the Auehärtungsbandes. The whole is wrapped with a 2.4 m long and made of nylon curing tape (available from Pa. Bally Mills - # 7399 with a width of 8.21 cm) under tension in a helical manner Minutes at a vapor pressure of 4 »4 kg / cm. After hardening it is cooled by passing cooling water through the mandrel. After cooling, the tape and the polyester film are removed. The exposed surface of the rubber sleeve is then precisely cylindrical with an outer diameter of 0.254 μm plus the outer durometer of the mandrel. For this purpose, the mandrel is clamped in a lathe using a conventional motor-driven grinding device attached to the lathe.

• During the physical examination of the rubber, the following were used quoted value © received »

final tensile strength 2430 kg / cm ²

final elongation 625 *

25 # module 9.35 kg / o « ²

Hart · (Duroaeter) 60 Short A

Bite strength 19.0 kg / cm ²

permanent compression. $ 14.75

The sleeve is turned inside out and after the vacuum expansion process on an inking roller for a Davidson printing press raised. The roller has an outer diameter of * 5.634 cm on so that between the diameters of the mandrel and the roller there is a difference of 0.935 em, so that the sleeve has a Has expansion of 19 »9 # from molded dimensions ·

The expansion unit consists of a 31 cm long Copper pipe with an inner diameter of 6.4 cm and with a Sehlauehfitting soldered on the outside for connection to a

Vacuum pump. . - "

The sleeve is pushed into the tube and its ends are turned over at the ends of the drill, creating a closed 3juf dream between the inner wall of the Hohres and the outside of the sleeve is created. This completed In dreams, up to 71 cm QS is evacuated, whereby the sleeve is sufficient is extended so that the pressure roller is in this can be introduced. Before that, however, the outside is still needed the roller ground down cylindrically. After the roller has been inserted, the vacuum is released, the sleeve shrinking again and calibrate to the roller with a tight fit. The overlapping ends of the sleeve are then turned back again and cut so far that: at the roller ends g a small overhang remains.

The coated roller was then turned into a Davidson press used, with the appropriate settings "made" to compensate for the larger diameters After this, printing tests were carried out with different types of paper, and it was found that the performance with the pressure roller according to the invention was at least equal to the roller with 'the original surface. Cleaning can be carried out much more easily than with rollers with the conventional sanded outer string. After 6 months intermittently » Animal bikes used by those who showed operational conditions there is no shifting of the sleeve on the roller.

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The suitability of the kneadable polyurethanes for sleeves that can serve as a printing surface, i.e. the sleeve can accept printing inks and transmitted with sufficient fidelity and remains stationary on the roller during use, is in contrast to others elastomeric materials as seen in Examples 2 and 3 below.

Example II

Parts by weight Acrylonitrile Butadiene Copolymer (1) 100 zinc oxide 5.0 Stearic acid 1.5 semi-fortifying carbon black 65 Di-butoxide ethyl sebacate 15th Para-coumarone resin (2) 5 sulfur 1.75 Bentothiazole disulfide 1.5 (1) available under the trade name Hycar 1052 (2) "" ^M. Vumar P-10

The sleeve was made according to the procedure described in Example I.

When physically checking this rubber were get the following results:

final tensile strength 130 kg / cm ²

final elongation 400 #

25 # module 8.8 kg / cm ²

Hardness (Durometer) 62 Shore A

Tear strength - 0 The 15.8 kg / cm ²

permanent compression 6

The sleeve produced had excellent tear resistance and could be opened without difficulty by the method described in Example I. After the opening on the roller, the sleeve showed a fine-grained, nodular shape Surface with which no print of acceptable quality could be produced.

009840/1423

Example III

Partial weight

2-chlorobutadiene 1.3 100

Magnesia. 2

Vaseline .. "■ ·. Z

Zinc oxide. _: 5

'2-Mercapto ~ Hiazolin 0.5

calcined kaolin clay 45

semi-fortifying carbon black 30

Di ~ butoxide-Ethal-Sebakat 20

The sleeve was made according to the procedure described in Example I. manufactured.

During the physical examination of this rubber, the obtained the following values:

final tensile strength 95 * 5 kg / cm ² ,

final stretch. 33Ο? Έ 25 ^ module 7.88 kg / cm ²

Hardness (i / urometer) 58 Shore A

continuous compression $ 13.36

Tear Strength - C The 8.99 kg / cm ²

The mandrel used to make this sleeve had a Outer diameter of 4.496 cm, while the roller has a Outside diameter of 5 »118 cm, so that the difference

0.622 cm, resulting in a 13.8 ^ expansion of the sleeve led.

When this sleeve was used as a forming roll cover in an Addreseograph-Multigraph Model 1250 Offeet duplicator, the sleeve was driven off the roller within 30 minutes of operation as a result of the stickiness of the outside of the sleeve. In a subsequent surface treatment of the sleeve this has been reduced I'endenz) however, it was produced a surface, wherein the desirable properties lacking carried d s contact with the polished surface dt · mandrels generated ·

Claims

- 009840 / U23

Claims (1)

-H- Claims MJ ₁ sleeve, which can form a parquet application surface for a pressure roller, characterized by a continuous hollow cylindrical structure made of a kneadable polyurethane « 2 · Method of pulling an elastomeric sleeve onto a Pressure roller body, characterized in that the sleeve is inserted into a cylindrical shape with a Means for evacuation is equipped, being between the outside of the sleeve and the inside of the cylindrical Form an enclosed air space is created, which is evacuated, wherein the sleeve expands until the The inner diameter of the sleeve is larger than the diameter of the pressure roller on which the sleeve is drawn that the sleeve is drawn onto the pressure roller in the expanded state, and that the vacuum is released, wherein the sleeve rests firmly against the pressure roller with a tight fit. 3β method according to claim 2, characterized in that the Sleeve is made from an elastomeric, kneadable polyurethane. 0098A0 / U23