DE1174046B - Process for producing shrink capsules - Google Patents

Description

Process for the production of shrink capsules It is known that vessels, in particular bottles to be locked with closures made of thermoplastics, wherein the closure is first expanded in the heat, then on the to be closed The vessel is put on and is shrunk there under the action of heat. After this However, processes are only relatively thick-walled closures to conclude Vessels have been made, and it is not for making and applying bottle caps suitable, which should enclose the bottle neck, because for this one as possible thin wall thickness is sought. In addition, the use of thermoplastic, high-polymer vinyl compounds mixed with plasticizers for shrink bodies known. However, capsules containing plasticizer cannot be obtained by this method Manufacture polyvinyl chloride, expand it and fix it in the expanded state, so that they can be shrunk onto a bottle opening because capsules are made of Plasticizer-containing polyvinyl chloride not retained in the expanded state can be.

The present invention avoids these disadvantages of the known ones Procedure. According to the invention from a capsule, which contains plasticizer Polyvinyl chloride is made by dipping the plasticizer before expanding removed by extracting. The expansion then gives one of the plasticizer Liberated capsule made of rigid PVC, which is kept stable in this state and at all times be shrunk on to close vessel openings at elevated temperature can.

The resulting return (shrinkage) to the original form has the consequence that the capsule is closely connected to the wall of the container and especially with bottles because of the i; :; Bottle mouth existing bead brings about a relatively good seal and above all: against all things easy detachment is ensured.

To carry out the procedure, proceed as follows: Polyvinyl chloride powder is mixed with a plasticizer, e.g. B. dibutyl phthalate, in proportion 1: 1 touched. Colorants can be added. It will be like that with plasticizer far thinned that when immersed in immersion bodies they only have a thin coating stay covered.

After immersion, it is allowed to drain well. The dipped forms are pregelled for about 3 to 4 minutes at 1200 C, then about 10 minutes in one Paraffin bath burned at about 1500 C. The extraction of the takes place at the same time Plasticizer.

If a paraffin bath is not used for firing, this must be done afterwards the extraction of the plasticizer take place, e.g. B. using trichlorethylene.

The mandrels are finally immersed in boiling water. the produced capsules loosen and can be pulled off the immersion bodies. The plasticizer-free blanks obtained in this way are tightened with a collet at elevated temperature, e.g. B. in hot water, expanded after cooling removed in cold water and finished in the same way on mandrels. The capsule produced in this way is placed on the container. Container including capsule are subjected to a higher temperature, e.g. B. is the one with capsule capped sealed bottle with her neck dipped in hot water. The capsule is now striving to take the original shape before expansion, so it is shrinking and consequently lies close to the wall of the container, e.g. B. the bottle, at. It sits firmly, in particular due to the bulge on the bottle neck. The closure is reasonably tight, resistant to moisture and bacteria and against acids and alkalis that are not too strong and above all dry and packable immediately.

Claims (1)

Claim: Method for producing widened, under Heat-shrinkable capsules made of polyvinyl chloride for Closure of vessels, especially bottles, in which the capsule is dipped out a plasticizer-containing polyvinyl chloride prepared in the desired form it is shown that the plasticizer is widen the capsule is removed by extraction. Documents considered: German Patent No. 655 737; U.S. Patent Nos. 2,608,334, 2041143.