摘要:
Process for fastening an accessory to a hollow body obtained by moulding a molten plastic parison, this fastening taking place by snap-riveting with the aid of a tool during the actual moulding of the parison, according to which, before carrying out the snap-riveting, the parison is locally deformed so as to surround the snap-riveting zone with a dome (or relief that is concave when seen from the outside of the tank and convex when seen from the inside), the snap-riveting zone being also in relief (hollow) compared to the rest of the accessory.
摘要:
Process for manufacturing a plastic fuel tank equipped with an internal line (2) by moulding a parison using a mould comprising two cavities and a core, said process comprising the following steps: 1. the parison (4) is introduced into the mould cavities; 2. the core is introduced inside the parison, said core having first been fitted with the line; 3. the mould is closed so that the cavities come into leaktight contact with the core; 4. the parison is pressed against the cavities by blowing through the core and/or applying a vacuum behind the cavities; 5. the line is fastened to the parison over at least two points using a device (5) attached to the core; 6. the mould is opened to withdraw the core; and 7. the final moulding of the parison is carried out by blow moulding (by injecting a pressurized fluid inside the parison) and/or thermo forming (by applying a vacuum behind the cavities), in which the line comprises, between its fastening points, a free length that is capable of coming into contact with the parison and/or with an accessory found thereon when the mould is closed, and according to which, during step (5), at least one intermediate fastening point is created using a device attached to the core.
摘要:
A core comprising means for attaching at least one accessory to a plastic parison, wherein the core further comprises means for monitoring the attachment of said at least one accessory to the plastic parison.
摘要:
Process for manufacturing a plastic fuel tank (FT) equipped with an internal accessory, by moulding a parison using a mould comprising two cavities and a core, said process comprising the following steps : 1. the parison is introduced into the mould cavities; 2. the core is introduced inside the parison, said core having first been fitted with the accessory; 3. the mould is closed so that the cavities come into leaktight contact with the core; 4. the parison is pressed against the cavities by blowing through the core and/or applying a vacuum behind the cavities; 5. the accessory is fastened to the parison by snap riveting using a device attached to the core; 6. the mould is opened to withdraw the core; and 7. the final moulding of the parison is carried out by blow moulding (by injecting a pressurized fluid inside the parison) and/or thermoforming (by applying a vacuum behind the cavities), in which the accessory comprises an orifice for the snap riveting (5) and at least one protuberance, for which the constituent material, the dimensions and the position are such that during the fastening of the accessory by snap riveting, this protuberance will at least partially melt to form a local weld which is at another location than the obtained rivet so as to obtain two different attachment points.
摘要:
Method for manufacturing a plastic fuel tank with improved creep strength, whereby: a) a plastic parison comprising two distinct parts is inserted into an open two- cavity mould; b) a core is inserted inside the parison, the said core bearing at least part of a reinforcing element capable of securing (creating a link between) the two parts of the parison; c) the parison is pressed firmly against the mould cavities (by blowing through the core and/or creating suction behind the cavities); d) (the part of) the reinforcing element is fixed to at least one of the parts of the parison using the core; e) the core is withdrawn; f) the mould is closed again, bringing its two cavities together in such a way as to grip the two parts of the parison around their periphery in order to weld them together; g) a pressurized fluid is injected into the mould and/or a vacuum is created behind the mould cavities in order to press the parison firmly against the mould cavities; h) the mould is opened and the tank is extracted.
摘要:
A core comprising means for attaching at least one accessory to a plastic parison, wherein the core further comprises means for monitoring the attachment of said at least one accessory to the plastic parison.