Patent GB-190328611-A (GB)
Title: Improvements in and relating to Paper and Pulp Making Machines.
Inventor: MILNE SAMUEL
Filed: 1903-12-30
Granted: 1904-12-15
Abstract: 28,611. Milne, S. Dec. 30. Paper machines; compound paper.- Relates to arrangements o f Fourdrinier wires, which are specially suitable for making duplex, triplex, and other compound papers, pulp boards, &c. which may be strengthened b y means of fabric, &c. Various arrangements o f wires are described. Fig. 1 shows two wires 2, 3 arranged above the ordinary wire 1 and deliver ing their webs upon it in the mannerlshown, the wire 2 depositing its web with the wire side downwards, and 3 with its wire side upwards. Each wire may be separately driven, the upper ones from the lower couch rolls 10, or from the delivery rolls 4 ; in the latter case the upper couch rolls 11 may be dispensed with. All the wires are given the usual shake, and in order that the delivery rolls 4 may have the same motion as the parts of the web 1 opposite to them, the side bars of the upper wires may be supported from the roll 14 of the lower wire. Cloth &c. may be inserted into the web from a roll ; 15 are trays to catch droppings. In Fig. 2 a wire 1 delivers its web on to a felt 2 below it, and the web is passed without having to be touched by hand to the press rolls 3, 4 with the wire side upwards so that it comes in contact with the bare top press roll. The wire passes round a large plain or perforated couch roll 5 having one or more rolls 6 arranged around it on the underside and within the felt. A number of wires may be arranged one above another and so as to deliver their webs on to a felt below, which is continued upwards along one side of the series of wings. Fig. 3 shows a number of wires, which are arranged above and caused to deposit in various ways their webs upon a felt below ; while Fig. 6 shows the manner in which a number of wires may bo caused to deposit their webs on the underside of a felt passing above. A rubber-covered roll 14, Fig. 6, runs in water to ensure the paper leaving the roll 13 and adhering to the wire ; and a rubber or other band 16 retains the water in the paper at this point. In the right-hand section of Fig. 6, two wires may be used as shown, or a single wire may be used, which is led from the roll 17 to the roll 21 and thence to the drum 11 returning over the roll 22. In another arrangement, the overhead felt is brought downwards to meet each wire, and the supporting-drums are caused to run in water, paste, &c., to cause adhesion of the various webs or layers of pulp. In order that the fibres may be properly settled before the web reaches the vacuum box, the wire may be supported wholly or partly by means of tube-rolls 13, Fig. 3. and of metal plates 14, or of india-rubber bands 15, as shown in the various parts of Fig. 3. The breast board may be made wider than usual to receive a shaking motion to interlace the fibres, or the whole breast box and breast board may be vibrated for the same purpose. To provide for a shake in short wires where the delivery end is led downwards or upwards to deliver the web on to a felt, the shake bars are extended to a suitable point beyond the couch roll, so as to take advantage of the full length of wire, or, as shown in Fig. 9, the whole wire together with its rolls and fittings, except the lower roller which delivers the web on to the felt below, may be carried by a frame 2, 3, 5, of which the beam 3 is pivoted upon the stationary beam 4. To prevent the roll 7, in this arrangement, from oscillating in a vertical arc, when the wire is led downwards in an oblique manner, the ends of the beam 3 may be supported from the frame by means of links or otherwise. To facilitate the changing of the Fourdrinier wire, the framing and supports for the rolls and parts which are inside the wire are arranged inside the path of the wire. The cross-bar 5, Fig. 9, is placed inside the wire. The breast roll ends of the side bars 2 are carried by supports 6, of which the front one is easily removable, the opposite ends are carried from the beam 4, and the couch roll is also carried from this beam or from the adjacent framing. Also, a part of the framing 9 is made removable. The edges of the paper are strengthened by applying narrow vacuum boxes or short ta-- rolls at the edges of the wire so as to remove water at these parts and cause more pulp to be deposited there.