Package making – Methods – With contents treating
Patent
1985-08-10
1987-07-14
Sipos, John
Package making
Methods
With contents treating
53551, 5216914, 52515, 52743, B65B 300, B65B 6300
Patent
active
046793801
DESCRIPTION:
BRIEF SUMMARY
This invention is concerned with the treatment of porous structures, and particularly with damp-proofing the wall of buildings or treating timber with fungicide or insecticide.
In my British Pat. Nos. 1,365,867 and 1,531,276 I describe a method of treating a porous structure in which a frozen rod or pellet of a treating solution which is liquid at ambient temperature is placed in a bore in the structure and allowed to thaw, thus allowing the treating solution to seep gently into the porous structure. This method has been used with great success to introduce aqueous solutions of sodium or potassium methyl siliconate into masonry walls to form a damp course. The use of such frozen rods, which are sold under the Registered Trade Mark FREEZTEQ, is covered by Agreement Certificate No. 81/827 and is the subject of British Pat. No. 1365867. British Pat. No. 1531276 discloses how the same technique can be used to dose timber (or masonry) with a fungicide or insecticide.
A problem in the use of this technique has been that the moulding operation for forming the frozen rods can be slow and cumbersome using copper or plastics tube which must be filled by the contractor and frozen immediately thereafter. The frozen rods can only be prepared in relatively small quantities depending on the freezing capacity of the contractor.
I have now developed a technique in which the treating solution is sealed into cylindrical plastics jackets to form a pre-pack treating composition which can be mass-produced, then readily transported and stored by the contractor for freezing as required. The pre-packs occupy less space in a freezer that the previous moulds, and so allow an increase in the production capacity of the contractor. Additionally, the plastics jackets make it easy to store and handle the treating solution before freezing, and make the handling of the frozen rods easier after freezing. The frozen rods can be taken to the work site in their jackets which can be stripped from the rods using a knife before insertion in the structure to be treated. As a modification the plastics jacket can be provided with a tear strip by which the jacket may be opened circumferentially or longitudinally to allow the rod to be removed.
In its simplest form the present invention provides a tube of solution-inpermeable plastics material containing the treating solution and sealed at each end. In its preferred form, the sealed ends of the tube are bundled and clamped to maintain the filled tube in a substantially cylindrical form.
A jacketed frozen composition produced by freezing a tube with a simple straight heat seal at each end is still usable in the technique of my previous patents, but the frozen rod will have fish tail shaped ends which will need to be trimmed to enable them to be inserted snugly in a bore hole, with consequent wastage of the material.
An embodiment of the invention will now be described in more detail, by way of example only, making reference to the accompanying drawings, in which:
FIG. 1 illustrates the formation and filling of plastics jackets,
FIG. 2 shows (a) a strip of sealed jacket after filling, (b) the bunching of the ends of the jackets, and (c) the final separated cylindrical jacketed pre-pack,
FIG. 3 shows (a) a section along line A--A of FIG. 2(b) and (b) a section along line B--B of FIG. 2(b), and
FIG. 4 shows (a) a schematic section through a wall being treated with a Freezteq frozen rod, and (b) a front view of the wall showing the positioning of bore holes.
Referring to FIG. 1 of the drawings, the plastics tubes for jacketing the liquid treating composition are advantageously formed from plastics strip 1. The strip 1 which is fed from a reel and shaped around a hollow mandrel 2 so that overlapping edges of the strip 1 can be heat sealed longitudinally along a seam 3 to form a tube. The lower end is sealed with a transverse heat seal to form seams 4 and as the seam 3 is formed the newly formed tube is moved downwardly. The tube is then charged with a predetermined amount of treating solution 5 through the
REFERENCES:
patent: 2613488 (1952-10-01), Attride
patent: 3324621 (1967-06-01), Runge
patent: 3861522 (1975-01-01), Llewellyn
patent: 3987602 (1976-10-01), Stahl
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