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| Lumber trimmer |
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| Machine tool with a rotatable supported part |
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| Apparatus for preventing the twisting of an electrical cord or cable |
| OF THE FIGURES Referring to FIG. 1, there is shown the device 10 which apparatus or device has an ... |
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| Electrical connector |
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| Manual crimping pliers |
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| Electric switch and actuator for an antenna drive system |
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Fiber strand package having a size with low solvent content
| Details |
Inventors: Moireau, Patrick; Johnson, Timothy;
Assignee: Vetrotex France (Chambery, FR)
Primary Examiner: Hoffmann; John
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
The invention relates to a process for manufacturing continuous a glass fiber strand. The process consists in depositing on the glass filaments which are in the process of being drawn a sizing composition consisting of a solution of which the solvent content is less than 5 wt %, the solution comprising a mixture of constituents which can be polymerized and/or crosslinked by heat treatment, at least 60 wt % of the constituents being constituents of which the molecular weight (Mw) is less than 750, less than 10 weight % being film-forming agents and 0 to 25 weight % being coupling agents, lubricants, stabilizers and initiators and/or catalysts, it being possible if necessary for the agent to be polymerized and/or crosslinked by heat treatment, in winding the strand or strands, formed by collection of the filaments, on a rotating support so as to form a wound package consisting of turns of strand coated with a non-polymerized sizing composition. The strands are intended to reinforce thermoplastic or thermosetting organic substrates or substances of mineral origin. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS At least 60 weight % of the mixture of constituents which can be polymerized and/or crosslinked are preferably formed of constituents of which the molecular weight (Mw) is less than approximately 500.
The constituents forming at least 60 weight % of the mixture are preferably monomers.
The use of a mixture of monomers which are generally relatively reactive encourages polymerization.
Moreover, the use of a mixture of monomers facilitates the development of crosslinking which imparts good stability to the resultant polymer.
The sizing composition deposited on the filaments should have a minimum content of constituents which can be polymerized and/or crosslinked; this content is preferably at least 70 weight %.
The sizing composition deposited on the filaments within the context of the process according to the invention generally comprises between 75 and 100 weight % of constituents which can be polymerized and/or crosslinked.
In the majority of cases the sizing composition deposited on the filaments is depleted of solvent.
It may sometimes comprise a small quantity of solvent which is then organic.
Organic solvents are sometimes necessary for dissolving particular constituents which can be polymerized and/or crosslinked.
The solvent may also be water, introduced in most cases by hydrated or hydrolysed constituents.
The amount of solvents, if any, is less than 5 wt % preferably less than 3 wt %, more preferably, less than 1 wt %.
The presence of these solvents in limited amounts does not require particular treatments in order to eliminate them.
The sizing composition deposited on the filaments is also characterized by the possible presence of small amounts of a film-forming agent.
The content of the film forming agent, which is less than 10 wt %, is insufficient for them to play the conventional role of bonding agents and impart any integrity to the strand.
This content is most frequently less than 5 wt %.
In small quantities, film-forming agents can facilitate the fiber-drawing process at a given drawing speed and for a given diameter of the drawn filaments
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