Abstract: The invention provides a continuous paperboard sheet adapted to be slit longitudinally into a plurality of continuous paperboard plies, and to improved paperboard plies for forming single-layer, paperboard tubes. The paperboard sheet has a substantially constant width and includes a plurality of thick longitudinal sections and a plurality of thin longitudinal sections. The thick and thin sections are arranged in alternating relation across the width of the paperboard sheet. The sheet is slit longitudinally along the thin sections to provide a plurality of tube-forming paperboard plies.

Abstract: The invention provides a continuous paperboard sheet adapted to be slit longitudinally into a plurality of continuous paperboard plies, and to improved paperboard plies for forming single-layer, paperboard tubes. The paperboard sheet has a substantially constant width and includes a plurality of thick longitudinal sections and a plurality of thin longitudinal sections. The thick and thin sections are arranged in alternating relation across the width of the paperboard sheet. The sheet is slit longitudinally along the thin sections to provide a plurality of tube-forming paperboard plies.

Abstract: An apparatus for cleaning an endless paper making felt continuously during the paper making process, and wherein the moving felt is passed through a cleaning bath, and ultrasonic vibrations are applied substantially uniformly across the entire width of the felt while the felt is immersed in the bath, to thereby achieve uniform cleaning of the felt and thus uniformity in the paper produced on the machine. The apparatus comprises an open, rectangular tank having a removable end wall, and a guide roll and ultrasonic transducers movably mounted in the tank, whereby the endless felt may be readily removed and/or replaced by removing the end wall, and lifting the guide roll and transducers, so that the felt may be slipped into the tank beneath the guide roll and transducers.

Abstract: A catalyst suitable for use in the preparation of fiber-forming polyesters and the method of making the same, wherein a tetraalkyl ammonium hydroxide is reacted with germanium dioxide, the reaction product being useful as a catalyst in the formation of fiber-forming polyesters.

Abstract: A process for preparation of flame retardant, fiber-forming polyesters by polycondensing a glycol phthalate and a phosphine oxide in the presence of the reaction product of germanium dioxide and a tetraalkyl ammonium hydroxide.

Abstract: A flame-retardant, easily dyeable polyester and the process for preparing the same by polycondensing a glycol phthalate prepolymer with a phosphine oxide and dye improver selected from the group consisting ofR--O(G--O).sub.x --Hwhere R is an alkyl group containing an average of from about 8 to about 20 carbon atoms; G is a hydrocarbon radical selected from the group consisting of ethylene, propylene, butylene and isomers thereof, and mixtures of the above, and x has a value of about 8-20, and ##STR1## where R is O, (CH.sub.3).sub.2 or H.sub.2 and the sum of x and y is 4-30. The polymer will be made up of 82 to 98 weight percent of the prepolymer, 8 to 1 weight percent of the dyeability improver and 10-1 weight percent of the phosphine oxide and is preferably formed in the presence of a catalyst which is the reaction product of germanium dioxide and a tetraalkyl ammonium hydroxide.

Abstract: The method of making a polyester polymer by polycondensing a glycol phthalate prepolymer in the presence of a germanium dioxide/tetraalkyl ammonium hydroxide catalyst.

Abstract: Fire retardant qualitites are incorporated into polyester fibers by adding to the polymer, prior to spinning thereof into filaments, not more than about 25 percent, based on the weight of the polymer, of a compound having the general formula: ##STR1## WHERE R is a radical selected from the group consisting of alkyl, aromatic and brominated aromatic; x = 2-4; and n = 1-100.

Abstract: Glycol solutions of a bis glycol ester of a difunctional aromatic compound possessing one or more metallo sulfonate groups suitable for use in continuous or non-continuous preparation of fiber-forming cationic dyeable copolyesters by copolymerization with a low molecular weight glycol-dicarboxylic acid prepolymer are prepared by reacting the dimethyl ester of a metallo sulfo dicarboxylic acid with glycol at a mole ratio of about 4-30 of the glycol to 1 of the dimethyl ester, under ester interchange conditions so as to provide a solution of the bis glycol ester of the metallo sulfo dicarboxylic acid in glycol containing about 20-75% of the bis glycol ester having a carboxyl plus carboxylate content of not more than about 200.mu.eq/g of bis glycol ester, and no more than about 10 weight percent of glycol ether based on bis glycol ester. A conventional ester interchange catalyst and glycol ether suppressant may be employed.

Abstract: Fire retardant qualities are incorporated into polyester fibers by adding to the polymer, prior to spinning thereof into filaments, not more than 25 percent, based on the weight of the polymer, of a compound having the general formula: ##SPC1##Where R and R' are radicals selected from the group consisting of hydrogen, methyl, ethyl, aryl, and brominated aryl; where R" is a radical selected from the group consisting of alkyl, aryl, and brominated aryl; and where n is an integer of from 1 to about 100.

Abstract: Fire retardant qualities are incorporated into polyester fibers by adding to the polymer, prior to spinning thereof into filaments, not more than about 20 percent, based on the weight of the polymer, of a compound having the general formula: ##SPC1##Where R is a radical selected from the group consisting of alkyl, aryl, and brominated aryl; where x + y equal 4-8, and where n is an integer of from 2-100.