Ichikawa Co., Ltd.

Ichikawa Woolen Textile Co., Ltd.

Norio Sakuma

Kazumasa Watanabe

Yasuhiro Tsutsumi

Harushige Ikeda

Kiyoshi Koase

To address the conflict between structural strength and flexibility in a conventional elastic belt for a papermaking calender, and to reduce manufacturing time, a belt in which the paper sheet-facing side of a base body side is covered by a high molecular weight elastic layer, is characterized in that the high molecular weight elastic layer is composed of a dense, first high molecular weight elastic layer and a second, high molecular weight elastic layer having a multitude of small voids of almost the same size. Flexibility of the layer having small voids is achieved while the dense surface layer is adapted to the ruggedness of the paper sheet.

Elastic belt for papermaking calender

A relatively low-cost calendering belt having excellent heat resistance and durability comprises a central portion , and left and right side portions located at the sides of the central portion. The right and left portions comprise high molecular weight elastic material having greater heat resistance than that of the central portion . The central portion is composed of high-molecular elastic material, the durability of which is higher than that of the right and left portions . The heat of the calender roll CR is intercepted by a paper W, and consequently is not transmitted to the central portion of the calender belt. The right and left portions of the calender belt, which are not protected by paper W do not deteriorate readily as a result of the heat of the calender roll CR because of their heat resisting property.

Belt for calendering

In a one-surface coated papermaking belt composed of a base layer and a thick resin layer, or a covered, one-surface coated papermaking belt composed of thin and thick resin layers on opposite sides of a base layer, curling of the edges of the belt due to the shrinkage of the thick resin layer is reduced by forming the opposite side edge parts of the thick resin layer thinner than the middle part. The reduction in curling results in improved oil removal especially in a shoe-press belt. It also stabilizes turning of the belt and facilitates belt installation.

Papermaking belt

A shoe press belt for papermaking is composed of heat-resistant base and resin layers, the resin layer containing a filler for either increasing or decreasing its thermal conductivity. The resin layers do not soften at high temperatures, and consequently the dewatering grooves do not deform during the pressing operation. Improved performance is observed both with both types of fillers. In one case external heat is prevented from entering the belt, and in the other case, the resin layers of the belt are not adversely affected by external heat even when they permit entry of heat. The resin layer may be composed of sublayers, some having filler, with the outer layer preferably free of filler so that the surface characteristics of the belt are unaffected. The sublayers may have fillers with different thermal conductivities, proceeding progressively from low to high or from high to low, for improved control over belt temperature.

Belt for shoe press

A shoe press jacket, wherein a base fabric layer consisting of woven cloth having filament yarn of straight or nearly straight arrangement in at least one of warp and weft is coated with resin from one surface thereof, the thickness of said base fabric layer is filled with said resin and a coated layer is formed on the opposite surface.

Shoe press jacket

A papermaker's felt having an elongated base fabric, at least one batt layer, and means to interconnect the opposite longitudinal ends of the base fabric to make an endless felt. The endless felt is made by providing seaming loops on opposite longitudinal ends of the base fabric and bringing the loops into interdigitated engagement on the papter making machine; introducing a core element into the common bight of said loops to connect them; and finally needling the batt layer so that the abutting ends thereof (which abut each other at right angles to the longitudinal direction and obliquely to the thickness direction) are engaged without any opening between them. Marking the paper on the felt is avoided by specially preparing the felt before putting it on the machine, by positioning said seaming loops in longitudinally spaced-apart relationship and inserting shape-retaining wires into the bights of said loops; and needling a batt layer on at least one side of the fabric and between said spaced-apart loops to make the batt layer endless; cutting said batt layer widthwise adjacent the loops of the fabric into flat form; removing the shape-retaining wires from the bights of the seaming loops at the opposited ends and temporarily connecting to loops and cutting away the extra fibrous batt so that the cut ends of the batt may abut one another obliquely to the thickness direction of the batt.

Growing community of inventors

Tokyo, Japan

Norio Sakuma