Method of jointing plastics sheet materials

A technology of plastic materials and sheets, applied in thin material processing, manufacturing of rigid/semi-rigid containers, paper/cardboard containers, etc., can solve the problems of reduced flexibility, difficult expansion, loss of pulse energy, etc., and achieves less possibility of leakage Effect

Inactive Publication Date: 2004-02-18
NOVAMEDIX DISTRIBUTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, an increase in the thickness of the material will make it stiffer and therefore less compliant between the bladder and the part of the body it is applied to, additionally the bladder will be more difficult to inflate resulting in a loss of pulse energy
Also, by increasing the working life of the bladder in this way will encourage re-use between patients, which can lead to cross-contamination of contaminants

Method used

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  • Method of jointing plastics sheet materials
  • Method of jointing plastics sheet materials
  • Method of jointing plastics sheet materials

Examples

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Embodiment Construction

[0023] The best way to practice the invention

[0024] Referring to Figure 1, the figure shows the use of radio frequency welding to form the A-V Impulse System TM Common method of inflatable bladder.

[0025] The bladder shown in Figure 1 comprises two oval flexible plastic sheets 1 and 2 welded together by radio frequency welding along their overlapping outer edge portions. The bladder has an inlet duct 3 for pressurized air which is connected to a molded inlet boss 4 formed on the skin 2 .

[0026] The thickness of the capsule skin used in this example was 0.25 mm. The edge portions of bladders 1 and 2 are held in overlapping relationship as shown, and radiofrequency welding is applied in region 5 at a distance from the peripheral edges of skins 1 and 2 by bringing electrodes 6, 6' closer together so that at 7 Form a cross-section of reduced thickness, typically 50%-70% of the original thickness.

[0027] The result of the weld is that at 8 of the two materials, the mat...

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Abstract

A method of joining thin plastics film or sheet materials to form sealed pressure vessels or containers particularly vessels or containers for use in the medical industry such as blood or urine bags. Experience has shown that there is a wide distribution of working life to failure for commonly used bladder materials due to fatigue stress to the area adjacent to the weld joining the sheet materials together resulting from radio frequency welding which is a common prior technique. In the present invention an more accurate controllable and repeatable method using is disclosed using the plastics injection moulding technique which uprates below the melting points of the materials to be joined thus avoiding early failure due to material degradation caused by the radio frequency welding.

Description

field of invention [0001] The present invention relates to a method of joining thin plastic films or sheets of material to form sealed pressure containers, especially for the pharmaceutical industry, such as blood or urine bags. Background technique [0002] A common method for constructing sealed pressure vessels is to use radio frequency (RF) welding to bond plastic sheets of material together to form the vessel. In this method, a high-frequency current is passed through a plastic material held as an insulator between a pair of radio-frequency electrodes. The heat generated by this process is sufficient to melt the materials to be bonded and to cause fusion between adjoining plastic sheets. A mechanical press is used to apply pressure to the fused area to complete the weld. [0003] The problem with radio frequency welding is the unreliable quality of the bond, especially the material strength in the heat-affected zone around the solder joint. [0004] In many medical a...

Claims

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Application Information

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IPC IPC(8): B65D30/16A61J1/10B29C45/14B29C45/16B29C65/00B29C65/04B29C65/70B31B21/60B31B50/64
CPCB29C66/43B29C66/24B29C65/70B29C66/1122B29C65/04B29C2045/1454B29C66/328B29L2031/7148B29C45/14073B29L2022/02B29C45/1671B29C45/14467B29C66/242B29C66/71Y10T428/19Y10T428/197Y10T428/13B29K2023/00
Inventor 戈登·库克
Owner NOVAMEDIX DISTRIBUTION
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