Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1989-02-02
1990-10-16
Rosenbaum, Mark
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
428906, B21B 3108
Patent
active
049625780
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a resin calender roll, such as a papermaker's calender roll, a textile calender roll, a magnetic tape calender roll, and the like.
PRIOR ART
Conventionally, a so-called cotton roll, paper roll, woolen roll, and the like of cotton wool, cotton, absorbent cotton, paper, wool, and the like have been used as papermaker's calender rolls.
Rolls utilizing these materials have a nonuniform hardness since they are aggregates of fibers. Therefore, when actually used, the hardness of the roll surface is made uniform to some extent by pre-operation. However, the operation for making the hardness of the surface uniform takes a considerable length of time. In these rolls using the fibers, internal heat generation during operation is large, and the interior of the roll is burnt and cannot be used any longer if the roll is operated at high rotational speed and pressure. If a problem such as web breakage occurs, paper sheets being treated become wrinkled, and are calendered overlying each other. If this happens, since the roll has poor recovery property, a paper trace remains on the roll surface, which damages the following paper sheets. Similarly, when a large-width sheet is treated after a small-width sheet has been treated, the edge portion of the small-width sheet directly influences the large-width sheet. For this reason, a plurality of auxiliary rolls are provided, the rolls being exchanged each time the sheet width is changed. If the surface of a roll has been damaged by overlying sheets, the roll is then re-ground.
A roll using a so-called thermoplastic monomer casting nylon is also used. This roll generates a large amount of heat and reaches a high temperature upon polymerization. Also, this type of roll has a large amount of molding shrinkage. Therefore, the roll must be prepared by fitting a hollow resin pipe on the surface of a metal core or mandrel directly or through an underlying layer such as urethane rubber. In the case of this roll, the metal core or the underlying layer is not adhered to the resin layer. For this reason, the resin layer is broken when this roll does not withstand high-speed rotation at high pressure. The fragments of the layer scatter and damage equipment, and may cause an accident involving personnel.
DISCLOSURE OF THE INVENTION
A calender resin roll according to the present invention is characterized in that the temperature of a characteristic inflection point of a storage modulus (E') of resin forming a surface layer adhering on a metal core is higher than the temperature corresponding to the sum of the resin temperature during operation and 10.degree. C., and is lower than the temperature corresponding to the sum of the resin temperature during operation and 80.degree. C., and the Shore D hardness of the resin falls within the range of 75 to 97.
The resin forming the surface layer can be any material which is in a liquid phase during molding, in order to facilitate the molding of a large roll, so that it can be injected in a mold and can be molded into a roll, and which can satisfy the requirements of the temperature of the characteristic inflection point of the storage modulus (E') and the Shore D hardness. More preferably, the resin should generate a small amount of heat upon crosslinking reaction, so that it can be easily formed on the adhesive layer, which is formed on the metal core. Examples of the resin include, a polyurethane resin, a polyisocyanurate resin, a crosslinked polyesteramide resin, or an epoxy resin.
The reason why the temperature range of the characteristic inflection point of the storage modulus (E') is determined to be higher than the temperature corresponding to the sum of the resin temperature during operation and 10.degree. C. and to be lower than the temperature corresponding to the sum of the resin temperature and 80.degree. C. is as follows:
In the case of the former temperature, it can be theoretically set to be higher than the resin temperature during operation. However, in practice, if the resin t
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Inoue Akiyoshi
Saito Yuji
Takaoka Yasuhiro
Yamada Kazuo
Chin Frances
Kinyosha Co., Ltd.
Rosenbaum Mark
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