SE450764B - PROCEDURE FOR THE PREPARATION OF A LIQUID PREPARATORY Capsule - Google Patents

Description

15 20 25 30 35 450 764 2 fresh condition from Scandinavia to North America, where for understandable reasons the shipping time becomes long and cooling ice in the meantime melts almost completely, even if the shipping takes place in heat-insulated boxes.

Description of the present invention.

It has now surprisingly been found possible to eliminate these problems and to produce an improved liquid-absorbent capsule according to the present process, characterized in that on a first web intended to form one side of the capsule gradually applied, given amounts of one during swelling, curing polymer mixture, when said polymer mixture swells, hardens and adheres to said first web, this web is joined to a second web intended to form the other side of the capsule while simultaneously joining the webs, after which a liquid-absorbent particulate material is introduced between the webs, after which the capsule finally closed to form a closed unit, wherein at least one of the webs is constituted by a liquid-permeable material, and wherein the polymer mixture curing during swelling forms spacers between said webs. Preferably, the spacers also attach to the second web for maximum stability and positioning of the contents of particulate liquid absorbent material.

Additional characteristics are set forth in the appended claims.

The invention will be described in more detail below with reference to the accompanying drawing, the only figure of which schematically shows a device for carrying out the method.

By 1 is meant a first web suitably made of a cellulosic material, such as a non-woven fiber web. which is unrolled from a first roll 2. The web 1 passes under a dosing unit 3, which gradually delivers certain doses / clicks (11) of a polyol-isocyanate mixture at equal distances from each other. The polymer material is foamed at the time of dosing and has the consistency of hard whipped cream. The polymer mixture at the dosage has a volume which roughly corresponds to 1/50 of the final volume. Dosing can be done in one, two or more rows, preferably two. The dosed polymeric material is allowed to swell during curing during the transport of the web 1 in the direction of the arrow to the intended predetermined height. The applied polymer doses adhere to the web 1.

When the web 1 passes the point 4, a joining substance, such as a hot melt adhesive, is applied, which is applied to the outer edges of the web 1. Then the web 1 is joined to a second web 5, which comes from a roll 6. At the joining point 7, the webs 1 and 5 are joined along their two long sides by applying heat. At the same time as the webs are brought together, the second web 5 attaches to the swollen polymeric material, so that the webs 1 and 5 are in practice linked together also via the spacers 13, the swollen and cured polymer doses 11.

As the webs 1 and 5 are brought together, a liquid-absorbent particulate material 12 is blown between the webs 1 and 5. The material 12 is dosed out from a silo (not shown) via a metering screw 9 and is suitably blown into the canister blank, i.e. between the webs 1, 5. The material 12, which may consist of a hydrophilic polycarbamide, a hydrophilic cellulosic fiber, a starch derivative (starch acrylonitrile copolymer) or preferably water with a density of 1 g / dms, absorbent polyurethane, should have a water absorption capacity of 50-150 g H 2 O per gram of polymer. . If a polyurethane type polymer is used, the polymer should be rolled to open the cell structure, which often becomes closed during the swelling curing process. The absorbent can also be formed in situ by introducing a polyol-isocyanate mixture which, when supplied with water, such as by melting ice, is reacted to form a polyurethane having liquid-absorbent properties.

The polymer balls 13 are used in the sealing as mentioned above because they are still sticky then.

When the material is introduced between the lanes 1 and 5, the lanes 1 and 5 are closed in a closure station 10 and then cut off to a suitable length. In connection with the closure, webs 1 and 5 are sealed, whereby when the material is introduced between webs 1 and 5, in reality three sides of the future canister are sealed. The cutting takes place in the middle of the sealing line. In the web S does not have to be completely permeable to water, as a cellulose web is, but may consist of a film-coated, perforated web that allows water passage. Thus, polyethylene-coated perforated paper web may be considered.

It is important that the canister is filled with a highly porous foam, which at the same time provides good insulation in the initial stage of transport and then gradually retains the cold water itself.

In order to better bind water or other liquid to the absorbent material, this may be mixed with a gelling agent, thickener which swells during the binding of water, such as a cellulose derivative, a starch derivative or various polymer particles of hydrophilic character.

According to a further aspect of the invention, a liquid-absorbent capsule as above can be placed and / or manufactured on a larger substrate, such as a polyethylene foil, which has a greater width and length than the absorbent, whereby heat-insulating parts are placed on the projecting parts of the foil. sheets of, for example, polyurethane foam or polystyrene. The heat-insulating boards have such dimensions and dimensions that they fit into an outer package, such as a cardboard box. Thus, a disc is placed on either side of the long sides of the absorber, and a disc on either side of the short sides of the absorber. In this case, a free foil surface is formed at each corner, which is suitably folded so that it folds easily when placed in a carton. A heat-insulating sheet can naturally be placed under the absorbent, either under or over the foil. Through this embodiment of the invention, separate manufacture and distribution of heat-insulating boards or compositions thereof can be eliminated, and application in a carton can be made much more rational.

Claims (4)

10 15 20 25 30 35 4-50 764 PATENT REQUIREMENTS. A process for producing a liquid-absorbent capsule containing a liquid-absorbent, particulate material and spacers, wherein a first web (1) intended to form one side of the capsule is joined to a second web (5) intended to form the other side of the capsule while simultaneously joining the webs (1,5) Along two sides, and between the webs (1,5) a liquid-absorbent, particulate material (12) is introduced, after which the capsule is closed to form a closed unit, wherein at least one of said webs (1,5) consists of a liquid-permeable material, characterized in that on the first web (1) gradually applied clicks (11) are applied of a polymer mixture which hardens during swelling, the polymer mixture after curing forming spacer bodies (13) between said webs (1, 5), and whereby the joining of the webs (1,5) takes place, then said polymer mixture hardens and swells. Method according to claim 1, characterized in that the polymer mixture (11) is attached to both webs (1,5) and thereby binds and stabilizes the capsule with its liquid-absorbent content. Process according to claim 1, characterized in that said polymer mixture consists of a swelling-curing polyisocyanate. Method according to claims 1-3, characterized in that the liquid-absorbent capsule is produced on a substrate with a greater extent than the capsule, wherein heat-insulating discs are placed on either side of the capsule to form a final heat-insulating / liquid-absorbent unit.