1. A winder apparatus for winding webs of material into rolls, comprising:
a conveyor for serially conveying said webs of material;
a selectively indexable turret having a plurality of winding spindles thereon, said turret being indexable to position each one of said spindles in a transfer position in operative association with said conveyor for initiating winding of each one of said webs of material on a respective one of said spindles in said transfer position; and
a transfer brush assembly positionable in operative association with said conveyor, said brush assembly being engageable with each said one of said webs of material for transferring said one of said webs onto the respective one of said spindles in said transfer position,
wherein said brush assembly comprises at least one rotatable brush wheel, said rotatable brush wheel rotating in a direction opposite to that direction in which said one of said webs is conveyed by said conveyor.
2. A winder apparatus in accordance with claim 1, wherein:
said brush assembly comprises a plurality of generally circular brush wheels rotatable together about an axis extending transversely of said conveyor.
3. A winder apparatus in accordance with claim 2, wherein:
said apparatus includes a plurality of guide fingers positionable generally about said one of said spindles in said transfer position,
said plurality of brush wheels being spaced apart and each positioned between a respective adjacent pair of said guide fingers.
4. A winder apparatus in accordance with claim 3, wherein:
said brush assembly and said guide fingers are mounted on a frame for movement together relative to the one of said spindles in said transfer position.
5. A winder apparatus for winding webs of material into rolls, comprising:
a conveyor for serially conveying said webs of material;
an indexable turret having a plurality of winding spindles thereon, said turret being indexable to position each one of said spindles in a transfer position in operative association with and generally transversely of said conveyor for initiating winding of each one of said webs of material on a respective one of said spindles in said transfer position; and
a transfer brush assembly positionable in operative association with said conveyor generally transversely thereof,
said transfer brush assembly including at least one rotatable brush wheel rotatable in a direction opposite to that direction in which said webs of material are conveyed,
said brush wheel being engageable with each one of said webs of material for transferring each said one of said webs of material onto said respective one of said spindles in said transfer position.
6. A winder apparatus in accordance with claim 5, wherein:
said brush wheel is engageable with said one of said spindles in said transfer position.
7. A winder apparatus in accordance with claim 5, wherein:
said transfer brush assembly includes a plurality of said rotatable brush wheels.
8. A winder apparatus in accordance with claim 7, wherein:
said apparatus includes a plurality of guide fingers positionable generally about said one of said spindles in said transfer position, said plurality of brush wheels being spaced apart and each positioned between a respective paid of said guide fingers,
said apparatus including a movable frame of which said guide fingers and said transfer brush assembly are mounted for movement together relative to the one of said spindles in said transfer position.
9. A winder apparatus in accordance with claim 5, wherein:
each of said spindles defines a plurality of air passageways at the periphery thereof.
10. A winder apparatus in accordance with claim 5, including:
a support roll positioned beneath said conveyor for cooperation with said brush assembly to facilitate transfer of each of said webs.
11. A winder apparatus for winding webs of material into rolls, comprising:
a conveyor for serially conveying said webs of material;
a selectively indexable turret having a plurality of winding spindles thereon, said turret being indexable to position each one of said spindles in a transfer position in operative association with said conveyor for initiating winding of each one of said webs of material on a respective one of said spindles in said transfer position; and
a transfer brush assembly positionable in operative association with said conveyor, said brush assembly being engageable with said each one of said webs of material for transferring said one of said webs onto the respective one of said spindles in said transfer position,
wherein said brush assembly comprises a plurality of generally circular brush wheels rotatable together about an axis extending transversely of said conveyor, and
said apparatus including a plurality of guide finders positionable generally about said one of said spindles in said transfer position,
said plurality of brush wheels being spaced apart and each positioned between a respective adjacent pair of said guide fingers.
12. A winder apparatus in accordance with claim 11, wherein:
said brush assembly and said guide fingers are mounted on a frame for movement together relative to the one of said spindles in said transfer position.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A liquid-crystalline medium having negative dielectric anisotropy based on a mixture of polar compounds, which comprises at least one compound of the formula I2
in amounts of 30-60% by weight, based on the medium; and
one or more compounds of formulae IIA andor IIB
in which
R2 denotes an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where, in addition, one or more CH2 groups in these radicals are each optionally replaced by \u2014O\u2014, \u2014S\u2014,
\u2014C\u2261C\u2014,\u2014CF2O\u2014, \u2014OCF2\u2014, \u2014OC\u2014O\u2014 or \u2014O\u2014CO\u2014 in such a way that O atoms are not linked directly to one another,
p denotes 1 or 2, and
v denotes 1 to 6.
2. The liquid-crystalline medium according to claim 1, wherein said medium further comprises one or more compounds of formula III
in which
R31 and R32 each, independently of one another, denote a straight-chain alkyl, alkoxyalkyl or alkoxy radical having up to 12 C atoms,
and
Z denotes a single bond, \u2014CH2CH2\u2014, \u2014CH\u2550CH\u2014, \u2014CF2O\u2014, \u2014OCF2\u2014, \u2014CH2O\u2014, \u2014OCH2\u2014, \u2014COO\u2014, \u2014OCO\u2014, \u2014C2F4\u2014 or \u2014CF\u2550CF\u2014.
3. The liquid-crystalline medium according to claim 1, wherein the proportion of compounds of formula I2 in the mixture as a whole is at least 35% by weight.
4. The liquid-crystalline medium according to claim 1, wherein the proportion of compounds of formulae IIA andor IIB in the mixture as a whole is at least 20% by weight.
5. The liquid-crystalline medium according to claim 2, wherein the proportion of compounds of formula III in the mixture as a whole is at least 3% by weight.
6. The liquid-crystalline medium according to claim 1, wherein said medium comprises at least one compound selected from formulae I1 and I3 to I9
7. A process for the preparation of a liquid-crystalline medium according to claim 1, comprising mixing the compound of formula I2 with at least one further liquid-crystalline compound, and optionally adding additives.
8. An electro-optical display with active-matrix addressing based on the ECB, PALC, FFS or IPS effect, wherein said display contains, as dielectric, a liquid-crystalline medium according to claim 1.
9. The medium according to claim 1, wherein said medium further contains a compound of formula I3
wherein the total concentration of the compounds of formulae I2 and I3 in the medium is \u226740% by weight.
10. The liquid-crystalline medium according to claim 1, wherein said medium additionally comprises one or more compounds selected from formulae IIIa to IIIh:
wherein alkyl and alkyl* each, independently of one another, denote a straight-chain alkyl having 1-6 C atoms.
11. The liquid-crystalline medium according to claim 1, wherein said medium additionally comprises one or more fluorinated terphenyls of formulae T-1 to T-22
wherein
R is an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where, in addition, one or more CH2 groups in these radicals are each optionally replaced by \u2014O\u2014, \u2014S\u2014,
\u2014C\u2261C\u2014, \u2014CF2O\u2014, \u2014OCF2\u2014, \u2014OC\u2014O\u2014 or \u2014O\u2014CO\u2014 in such a way that O atoms are not linked directly to one another.
12. The liquid-crystalline medium according to claim 1, wherein said medium additionally comprises one or more compounds of the formulae
where
R22-23 are each, independently of one another, an alkyl or alkenyl radical having up to 4 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where, in addition, one or more CH2 groups in these radicals are each optionally replaced by \u2014O\u2014, \u2014S\u2014,
\u2014C\u2261C\u2014, \u2014CF2O\u2014, \u2014OCF2\u2014, \u2014OC\u2014O\u2014 or \u2014O\u2014CO\u2014 in such a way that O atoms are not linked directly to one another,
R24 is CH3, C2H5 or n-C3H7, and
q is 1 or 2.
13. The liquid-crystalline medium according to claim 1, wherein said medium additionally comprises at least one compound of the formulae O-1 to O-12
wherein
R1 and R2 are each, independently of one another, is an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where, in addition, one or more CH2 groups in these radicals are each optionally replaced by \u2014O\u2014, \u2014S\u2014,
\u2014C\u2261C\u2014, \u2014CF2O\u2014, \u2014OCF2\u2014, \u2014OC\u2014O\u2014 or \u2014O\u2014CO\u2014 in such a way that O atoms are not linked directly to one another.
14. The liquid-crystalline medium according to claim 1, wherein said medium 35-60% by weight of said compound of formula I2.
15. The liquid-crystalline medium according to claim 9, wherein said medium contains 30-40% by weight of said compound of formula I3.
16. The liquid-crystalline medium according to claim 9, wherein the total concentration of the compounds of formulae I2 and I3 in the medium is \u226745% by weight.
17. The liquid-crystalline medium according to claim 10, wherein said medium contains at least one compound of the formula IIIa, formula IIIb andor formula IIId.
18. The liquid-crystalline medium according to claim 11, wherein said medium contains 2-30% by weight of compounds of formulae T-1 to T-22.
19. The liquid-crystalline medium according to claim 11, wherein said medium contains at least one compound selected from formulae T-1, T-2, T-3 and T-22.
20. The liquid-crystalline medium according to claim 12, wherein said medium contains 5-25% by weight of compounds of the formulae
21. The liquid-crystalline medium according to claim 1, wherein the rotational viscosity \u03b31 of said medium is <200 mPa\xb7s.