Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1983-08-03
1985-03-05
Wityshyn, Michael
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156 72, 156177, 156178, 156435, 156436, 156497, 156553, 1565801, 1565802, B29C 2708, D04H 1104
Patent
active
045029024
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application corresponding to international application No. PCT/CH82/00125 filed Dec. 1, 1982 and benefiting from the priority of a Swiss national application No., 7,728/81-9 filed Dec. 3, 1981 under 35 USC 119 and the International Convention. The priority of these applications is claimed.
FIELD OF THE INVENTION
This invention relates to a process for covering a substrate comprising threads welded by ultrasounds, these threads and this substrate being made, at least partially, of thermoplastic material; the invention also relates to an apparatus or machine for the application of this process as well as to a substrate covered with threads welded by ultrasounds, obtained in accordance with this process.
BACKGROUND OF THE INVENTION
A process has already been proposed in Swiss patent No. CH 580 496 for the production of a pile fabric wherein a sheet of parallel threads is conformed in succession in rows of loops fastened progressively to the surface of a support by causing the material of the threads and of the support to melt locally in their zone of contact by pinching them between a bearing surface and a sonotrode set into acoustic vibration at a frequency and amplitude which can cause the melting of the thermoplastic material. According to this process, the sheet of threads is pleated using a mechanism having an alternating motion superimposed on the defilading motion of the support. This mechanism comprises a matrix provided with a multiplicity of tubes guiding the threads, which are aligned in a crosswise direction with respect to the direction of defilading motion of the support and which are mounted so as to move in a back and forth motion in a plane perpendicular to that of the relative motion between the welding sonotrode and a welding bearing surface so as to form a series of successive parallel loops mounted on the support the bases of which are welded progressively onto the surface of this support in the zones thereof adjacent to that support.
One of the main drawbacks of this system is the nature of the alignment of the rows of loops on the support which is not desirable in the case of a rug because it gives rise to less satisfactory covering power of the support and makes the junctions more difficult to effect because if the rows are not placed perfectly in line with one another, the junction line becomes extremely distinct. This invention aims at correcting, at least partially, the above mentioned drawbacks.
SUMMARY OF THE INVENTION
To this effect, the object of this invention is first the provision of a process designed to cover a substrate with threads welded in place by ultrasound, these threads and this substrate being at least partially made of thermoplastic material, wherein this substrate is placed opposite a welding sonotrode, parts of said threads are brought into contact with that part of the substrate placed opposite this sonotrode, these parts of the substrate and threads are pressed into contact against the sonotrode connected to a source of energy so that variations in ultrasonic pressures are transmitted to them which can create between them a localized fusion and this pressure is released in order to displace the substrate and effect the welding of another part of these threads onto another part of the surface thereof and so on until the substrate has been covered. This process is characterized by the fact that the sonotrode is placed in a position adjacent to the reverse of the substrate, each of said threads is passed through a guiding duct the outlet extremity of which is adjacent to a receiving obverse surface facing away from the sonotrode, these guiding ducts are given alternating motions along a direction which is substantially perpendicular to the vibration transmission face of the sonotrode and these bearing surfaces are periodically brought into elastic contact with the obverse part of the substrate passing over said vibration transmission face of the sonotrode so that this part of t
REFERENCES:
patent: 2856605 (1974-12-01), Carpenter
patent: 3640786 (1972-02-01), Carpenter
patent: 3736209 (1973-05-01), Carpenter
patent: 3900354 (1975-08-01), Carpenter
patent: 3982978 (1976-09-01), Carpenter
Cottenceau R/e/ mi
Z/u/ rcher Erwin
Dubno Herbert
Ross Karl F.
SIRS - Societe Internationale de Revetements de Sol S.A.
Wityshyn Michael
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