Soft Resin

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Soft Resin


a resinous material that is produced upon wounding of coniferous trees; it is present in the resin channels that permeate the wood of the pine, cedar, fir, and larch. Solidifying on the surface of the trunk, soft resin protects the wood from penetration by bark beetles and fungi, “healing” the wound (hence the Russian name, zhivitsa, from zazhivliat’ “to heal”).

Soft resin is a basic raw material in the production of rosin and turpentine. It is produced by making a series of shallow incisions on the trunks of growing trees (so-called tapping). The yield of soft resin depends mainly on the species or kind of wood and on climatic conditions. In the USSR the tree most suitable for tapping is the Scotch pine (Pinns sylvestris), which yields 0.9–2.0 kg of soft resin per tree per year. Soft pine resin is a viscous, transparent liquid with a pleasant pine odor. It consists of a volatile part (turpentine) and nonvolatile resin acids (rosin), with water as an impurity. Soft resin thickens in air because of evaporation of the turpentine and crystallization of resin acids, and it becomes turbid, like saccharified honey. The soft resin delivered to refineries contains about 75 percent rosin, 18 percent turpentine, and 6 percent water. The processing of soft resin involves purification and steam distillation of the turpentine, with simultaneous melting of the solid resin acids.


Atamanchukov, G. D. Zhivitsa iprimenenie produktov ee pererabotki. Moscow, 1968.
Tekhnologiia i oborudovanie lesokhimicheskikh proizvodstv. Moscow, 1969.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Machida, Nakayama, and Fujita developed a safety glass based on layers of glass bonded by vinyl copolymers and soft resin layers containing 0.01 to 2 wt% heat absorbing, 100 nm or less tin or indium oxide nanoparticles dispersed in polycarbonate or acrylic resins.
In this paper, instead of a plasticizer, polybutylene adipate terephthalate (PBAT), which is a solid soft resin and is much more flexible than PLA, was chosen and the mechanical and electrical properties of PLA with PBAT added were investigated.
In addition, it uses two types of resin in a core shell structure, so that a soft resin is used in the shell to encourage bonding between particles.
Desmopan DP 9370A (70A ether) is a soft resin designed for use in catheters, tubing, and soft grip applications.
Session 3 on "TPEs for automotive applications," will include the following presentations: "Polyolefin resin for airbag application--morphology of soft resin and parts performance," Nadeem Bakhari, Autoliv North America, and Hiroshi Toyoda and Kousuke Ohtani, Sumitomo Chemical Ltd., Japan; "The influence of painting systems on TPVs in low temperature deployment behavior of airbag doors," Herman Vos, DSM Thermoplastic Elastomers," The Netherlands; "Development of new TPV sponge materials and foaming systems for dynamic automotive weatherseals," Eric Jourdain, ExxonMobil Petroleum & Chemical, and Jere Anderson, Trexel; and "TPV for hidden door frames," Klaus-Peter Maass, GDX-Grefrath and Get Vroomen, DSM Thermoplastic Elastomers, The Netherlands.
The tentacles are made of copper and each one has a piece of soft resin on the tip so that when you rub it on your head, it doesn't hurt.
Rachel Whiteread is not one of these, but her casts of everyday objects arranged in the British pavilion make one of the most potent places in the whole exhibition: her white room of books, cast from numerous paperbacks on standard shelves, was made specially for the building and is luminous, evocative of literacy and domesticity alike; her use of warm, slightly soft resin in pieces like 'Bath' adds a more tender note to her usually ascetic and abstract repertoire.
Urethane Acrylate Resin A was designed as a 100% solids soft resin that has a viscosity of 10,000 mPas at 25 [degrees]C.
It increases flow of the hard resin from one melt pump while decreasing the flow of soft resin from the second melt pump, and vice versa, making seamless transitions from hard to soft to hard.
Already soft resin prices are expected to drift still lower by some suppliers.
This is especially true for resins with a low drying temperature or soft resins that can stick together if the drying temperature is elevated.