초록 ▼

An aerosol solvent weld cement composition for joining ends of plastic pipe. The composition contains at least one polymer capable of welding the plastic pipes to each other, at least one solvent for the polymer, and at least one propellant for the polymer/solvent solution. The composition is mainta

An aerosol solvent weld cement composition for joining ends of plastic pipe. The composition contains at least one polymer capable of welding the plastic pipes to each other, at least one solvent for the polymer, and at least one propellant for the polymer/solvent solution. The composition is maintained under pressure greater than atmospheric pressure in an aerosol container. A female omnidirectional valve is disclosed for use in the aerosol container. This valve comprises a valve body having an omnidirectional attachment which contains a check valve container made up of a constricted lower end, a top surface, a lateral opening, and a check ball for opening and closing passageways. This valve allows the solvent weld cement composition to be applied to pipes from any angle.

대표청구항 ▼

An aerosol solvent weld cement composition for joining ends of plastic pipe. The composition contains at least one polymer capable of welding the plastic pipes to each other, at least one solvent for the polymer, and at least one propellant for the polymer/solvent solution. The composition is mainta

An aerosol solvent weld cement composition for joining ends of plastic pipe. The composition contains at least one polymer capable of welding the plastic pipes to each other, at least one solvent for the polymer, and at least one propellant for the polymer/solvent solution. The composition is maintained under pressure greater than atmospheric pressure in an aerosol container. A female omnidirectional valve is disclosed for use in the aerosol container. This valve comprises a valve body having an omnidirectional attachment which contains a check valve container made up of a constricted lower end, a top surface, a lateral opening, and a check ball for opening and closing passageways. This valve allows the solvent weld cement composition to be applied to pipes from any angle. shed product, each clamp having a pair of jaws for clamping a marginal zone of a blank coupon (C, P) in at least two regions thereof which are spaced apart from each other in the travel direction of the chain, and having external abutments secured to one or other of the jaws for laterally positioning the blank coupon (C, P) held between said jaws. 2. An installation according to claim 1, characterized in that each clamp has lateral fastenings fastening it to the chain, the fastenings being located below the plane in which a coupon (C, P) is held by the jaws. 3. An installation according to claim 2, characterized in that: each clamp has a central spring disposed between the bottom face of the bottom jaw and a bottom plate secured to the top jaw; each clamp has vertical external abutments extending upwards and secured to the bottom jaw; the width (l) of engagement between the jaws of each clamp lies in the range 3 mm to 5 mm; the clamp opening/closing means comprises a mechanical pusher secured to a mechanism of the crank and connecting rod type or an outline of a rotating cylinder; and the feeder station for supplying blank coupons (C, P) comprises a transfer and cutting station for transferring to a clamp a segment of a strip (B) disposed transversely relative to the chain, the strip having a succession of segments constituting blank coupons (C, P). 4. An installation according to claim 1, characterized in that each clamp has a central spring disposed between the bottom face of the bottom jaw and a bottom plate secured to the top jaw. 5. An installation according to claim 1, characterized in that each clamp has vertical external abutments extending upwards and secured to the bottom jaw. 6. An installation according to claim 1, characterized in that the width (l) of engagement between the jaws of each clamp lies in the range 3 mm to 5 mm. 7. An installation according to claim 1, characterized in that the clamp opening/closing means comprises a mechanical pusher secured to a mechanism of the crank and connecting rod type. 8. An installation according to claim 1, characterized in that the clamp opening/closing means comprise an outline of a rotating cylinder. 9. An installation according to claim 1, characterized in that the feeder station for supplying blank coupons (C, P) comprises a transfer and cutting station for transferring to a clamp a segment of a strip (B) disposed transversely relative to the chain, the strip having a succession. of segments constituting blank coupons (C, P). 10. An installation according to claim 9, characterized in that the feeder station has support means for supporting a storage reel of said strip (B), a pair of superposed cylinders between which the strip (B) coming from the reel is pinched and which constitute a motor-driven pulling unit, a motor-driven guillotine disposed between the motor-driven puller unit and the path of the clamps, and an optical cell for monitoring the arrival of clamps in register with blank coupons (C, P) to be cut off by the guillotine from segments of strip (B) and to be held by the clamp actuated by clamp opening/closing means disposed in the vicinity of the feeder station and synchronized with the indexed advance of the chain. 11. An installation according to claim 1, characterized in that it has code marks on each clamp and in that it has at least one station for personalizing the coupons (C, P) constituted by a station for individualized printing of at least one face of the coupons (C, P) transported by said clamps. 12. An installation according to claim 1, characterized in that it comprises a pre-laminating station with top and bottom rolls for supplying strips of plastics material (P11,P12) perpendicularly to the travel direction of the chain to form a folder (P2) that encloses an insert constituted by a pre-cut-out personalized coupon (P1) held by a clamp, and a laminating station acting on the assembly constit