PaperCelluloseBasedPresspaperInReels

Presspaper in Reels

Introduction
WEIDMANN presspapers are produced on machines with up to 7 forming cylinders. This multilayer construction provides homogenous products and thus maximum electrical and mechanical strength and prevents the exposure of pin holes. The raw materials used for WEIDMANN electrical presspapers are kraft wood pulp, cotton fibers and cotton linters. WEIDMANN's product range, with thicknesses from 0.10 mm to 1.0 mm, in widths from 3 mm to 3400 mm, and  densities from 0.75 g/cm³ to 1.20 g/cm³ meets international standards.

Field of Application
Presspapers have various applications not only in power and distribution transformers but also in capacitors and motors.

Types

Cotton Fiber
This grade is produced with 100% cotton fibers and thus provides excellent drying characteristics and a higher elongation and flexibility.

Cotton Linter
This is a UL® approved paper with a very low conductivity. Its applications range from small motors to oil immersed power transformers.

Diamond Dotted (DDP)/ Diamond Pattern (DPP)
The use of this B-stage resin coated paper increases the short circuit strength of distribution transformer coils. WEIDMANN offers a kraft and a kraft/cotton grade.

Kraft
The standard kraft grade is available in a density of 1.15 g/cm³ but can also be produced in a density of as low as 0.75 g/cm³.

Kraft/Cotton
WEIDMANN produces a 50% kraft, 50% cotton presspaper that provides faster drying and increased elongation compared with pure wood based paper.

Laminates
Laminates are used where a combination of the properties of presspaper and polyester film is the best solution. These laminates are available as polyester/presspaper (MP), polyester/presspaper/polyester (MPM) or presspaper/polyester/presspaper (PMP) with all four presspaper grades and insulating paper.

Thermally Upgraded
An improved thermal capacity is achieved by impregnating with chemicals that increase nitrogen content and decrease paper degradation under prolonged high temperature conditions.