摘要:
A noncompressive dewatering device generates air streams that can be used to remove water from cellulosic webs in an energy efficient manner. Further, a wet-pressed machine can be modified to economically produce low-density tissue with an energy/capital efficiency greater than that of the throughdrying process. For instance, a cellulosic web can be non-compressively dewatered from a post forming consistency to a consistency from about 25 percent to the water retention consistency by passing air through the web with an Energy Efficiency at least 10 percent greater than that achievable using vacuum dewatering at the same speed. In particular embodiments, the web may be non-compressively dewatering to a consistency of at least 70 percent of the water retention consistency using about 13 or less horsepower per inch of sheet width, or to a consistency of at least 80 percent of the water retention consistency using about 30 or less horsepower per inch of sheet width, both at a speed of 2500 feet per minute or greater.
摘要:
The invention concerns a method for detecting contamination and/or damage in a face (11, 12') running through a nip (N) or nips in a paper machine or in a paper finishing machine, such as a calender or a coating device. In the method, vibrations formed in connection with constructions of the machine are detected and processed. The vibrations are detected by means of at least two detectors (20, 21, 25). Based on the point of time of detecting of the vibrations detected by means of the detectors (20, 21, 25), the location of the damage and/or contamination (M; M1, M2) on the face (11, 12') to be monitored is determined. In the method, it is possible to detect vibrations in the frame of the roll (10, 12, 15) that forms a nip and/or in the bearings (14a, 14b) of the roll by means of a pair of detectors (20a, 20b, 21a, 21b; 22n). The location of the source of disturbance in the axial direction (X) of the roll is determined on the basis of a difference in phase ( phi ) between the vibrations arriving in different detectors in a pair of detectors. By means of detectors (20a, 20b) placed in connection with the bearings (14a, 14b) of the rolls to be monitored, it is additionally possible to monitor the condition of the bearings of the rolls.
摘要:
A multiply paper web comprises a base ply (101) of a post-manufactured sheet such as reused old newsprint or reused office waste. An upper and/or lower ply (103) is bonded to the base ply by bonding agent (107) to cover any printing or contamination of the base ply, thus allowing the resulting web to be reprinted or used for writing or packaging grades. The base ply is not repulped, reducing water and energy usage in the manufacturing process. The upper and lower plies may be wet formed or dry formed from fiber (105). Dry formed upper and/or lower plies result in a paper product utilizing little or no water in the manufacturing process, and no aqueous effluent. The post-manufactured base ply provides the strength ply.
摘要:
A non-through air dried paper web and method of making such a paper web are disclosed. The paper web includes at least two regions of different density and at least two regions of different basis weight. In one embodiment, the paper web includes a relatively high basis weight continuous network region, a plurality of discrete, relatively low basis weight regions dispersed throughout the relatively high basis weight continuous network region, and a plurality of discrete, intermediate basis weight regions circumscribed by the relatively low basis weight regions.
摘要:
The invention relates to a method and an apparatus for executing a grade change in a paper machine, in which method a grade change is executed by determining, in advance, target ramps for different process variables, which are ramped according to said ramps during the grade change. Data about the grade changes already executed is collected, whereafter data about successful grade changes is selected and the grade change models to be used are determined on the basis of this data, and the target ramps are determined by means of these grade change models.
摘要:
A papermaking belt and paper made thereon. The papermaking belt may be a through air drying belt having a plurality of deflection conduits therethrough. The deflection conduits are divided into subconduits by peninsular segments. Likewise, the paper made on the belt has an essentially continuous network and a plurality of domes. Each dome is divided into a plurality of subdomes by peninsular segments in the paper. The papermaking belt may, alternatively, be a forming wire. If so, the forming wire may have a plurality of discrete protuberances extending outwardly from the plane of the forming wire. Each protuberance has at least one slot therein. The slots extend into the discrete protuberance. Likewise, the paper made on this forming wire has a high basis weight essentially continuous network and discrete low basis weight regions corresponding to the discrete protuberances. Each low basis weight region has at least one high basis weight peninsular segment corresponding to the slot in the protuberance.
摘要:
High bulk tissue webs are processed sequentially through separate calendering and embossing units to optimize the balance between sheet caliper for winding tension and embossing element height for pattern definition, resulting in embossed, high-bulk tissue products with improved embossing pattern clarity. The multiple step converting process enables the use of male embossing elements having a height of about 0.04 inch or greater. The tissue webs have a Residual Waviness value of 12 micrometers or greater, which is attributable to average surface waviness values for the spot embossements being about 30 micrometers or greater.
摘要:
The present invention provides method for making a wet pressed paper web. An embryonic web of papermaking fibers (120) is formed on a foraminous forming member (11), and transferred to an imprinting member (219) to deflect a portion of the papermaking fibers in the embryonic web into deflection conduits in the imprinting member. The web (120), the imprinting member (219), and the two felt layers (320, 360), are then pressed in a compression nip (300) with a foraminous backing member (350) to mold and dewater the web.
摘要:
A papermaking belt comprised of a resinous polymer with improved elongation. The papermaking belt of this invention is comprised of a reinforcing element and a resinous polymer wherein the resinous polymer exhibits improved elongation both at room temperature and elevated temperatures while maintaining creep resistance and without any undue loss of tensile strength. In addition to papermaking belts, the resinous polymer of this invention may also be used for other applications.
摘要:
A non-woven mat (18) of inorganic fibre is disclosed having a substance which is lower at the edges (26') of the mat than in the remainder (28) of the mat. Apparatus for making such a mat comprises: a source of a slurry of inorganic fibre in a liquid; a forming wire disposed to move past the source, through which the liquid passes to deposit the inorganic fibre on the forming wire; a mask across a part of the width of the forming wire to hinder passage of the liquid through the forming wire over the said part, the effectiveness of the mask varying in the direction of movement of the forming wire past the slurry source. A method of making the mat comprises passing a forming wire past a slurry of inorganic fibres in a liquid while masking a part of the width of the forming wire as it passes through the slurry, the masking varying along the length of the forming wire as it passes through the slurry; and urging the slurry against the forming wire and causing the liquid to pass through the forming wire, whereby a non-woven mat of inorganic fibre is formed having an uneven substance (weight/unit area) in the cross direction.