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ultrasonic generator

An ultrasonic and generator technology, applied in the field of ultrasonic generators, can solve the problems of reduced fatigue residual life, incomplete uniformity and continuity of transverse sealing belts, etc.

Active Publication Date: 2016-07-06
TETRA LAVAL HLDG & FINANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] Correspondingly, the resulting transverse sealing band may still not be completely uniform and continuous
Furthermore, these additional spurious frequencies cause additional fatigue stress on the sonotrode, with consequent reduction of its fatigue residual life

Method used

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Examples

Experimental program
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Embodiment Construction

[0049] figure 1 Reference numeral 1 in denotes the sonotrode according to the invention as a whole.

[0050] The sonotrode 1 may be incorporated in a packaging machine (not shown), which is used to extract the ultrasonic wave along a vertical path Q ( Figure 7 ) tube 2 of fed packaging material to produce airtight packages of pourable food products such as pasteurized or UHT milk, juices, wine, etc.

[0051] The tube 2 is formed in a known manner by longitudinally folding and sealing a web of heat-sealed sheet material and is filled continuously from the top with sterilized or sterilized food product.

[0052] The packaging machine comprises in a known manner at least one pair of forming assemblies 3 ( Figure 8 Only one shown), the forming assembly interacts cyclically and continuously with the tube 2 of packaging material to grip, ultrasonically seal and cut the tube 2 along equally spaced traverses. More specifically, the forming assembly 3 interacts with the tube 2 to ...

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PUM

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Abstract

A sonotrode (1) comprising: a head (15) defining a sealing surface (14) elongated in a first direction (A); and first and second drive units (12) different from each other, which each comprising at least one piezoelectric element (13); wherein the first and second drive units (12) can be fed by a single generator in order to cause oscillations of the head (15); the head (15) is transverse to the seal The height (H) measured in the second direction (B) of the surface (14) is substantially equal to half the wavelength of the waves oscillating in the direction of the second direction (B); the sonotrode (1) also includes: at least one narrow a slot (23) extending through the head (15) transverse to the first and second directions (A, B); at least a limited number of nodes (20) at which the oscillation of the head (15) the amplitude is substantially equal to zero; and a plane (P) on which at least some of the nodes (20) lie, and the plane (P) divides the head (15) into a first part (21) and a second part (22) ; The slot (23) is at a certain distance from the plane (P).

Description

technical field [0001] The present invention relates to ultrasonic generators. Background technique [0002] Many pourable food products such as juice, pasteurized or UHT (Ultra High Temperature Treated) milk, wine, tomato sauce, etc. are sold in packages made of sterilized packaging material. [0003] A typical example of this type of packaging is the parallelepiped-shaped packaging for liquid or pourable food products known as "Tetra Brik Aseptic" (registered trademark), which is produced by folding and sealing laminated strip packaging material. [0004] The packaging material has a multi-layer structure, which basically includes a base layer providing rigidity and strength, which may include a layer of fibrous material such as paper or a layer of polypropylene material impregnated with inorganic substances; layer of heat-sealable plastic, such as polyethylene film. [0005] In the case of aseptic packaging for long-term storage products such as UHT milk, the packaging ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B06B3/00B29C65/08B29C65/74B65B51/22B65B51/30B65B9/20B65B9/207
CPCB06B3/00B29C65/08B29C65/7451B29C66/1122B29C66/4312B29C66/81431B29C66/816B29C66/83523B29C66/83533B29L2031/7128B65B9/207B65B51/225B65B51/306B29C66/8145B29C66/849B29C66/81427B29C66/83221B29C66/71B29C66/72321B29C66/72328B29K2705/02B29C66/8167B29L2031/7166B29K2023/086B29K2023/06B29K2023/12
Inventor U.弗格勒F.焦尔达诺S.曼钦A.梅兰德里M.拉贝
Owner TETRA LAVAL HLDG & FINANCE SA