Coated Preform for Container and Method for Producing Same

Preform according to any one of the preceding claims, characterized in that at least one additional coating layer (5, 7) is provided on the coating base layer (3), particularly on its exterior, which is scratch-resistant in order to prevent damage to the base coating (3).

Preform according to the preceding claim, characterized in that said additional coating layer (5) and/or (7) is composed of PVdC generating an increased adhesion of the coating, as well as of the moisture barrier compared to the same PVdC coating without VAC layer.

Preform according to one of the preceding claims, characterized in that it provided with a barrier coating, possibly with a barrier in its own wall (22).

Preform according to one of the preceding claims, characterized in that said coating (3, 5, 7;

• 4) contains barrier additives, particularly which are a pure component or a water-based coating or being incorporated into the polymer-borne coatings as an additive.

Preform according to the preceding claim, characterized in that said barrier additives have an organic component, having as functionality an increase of the moisture/O2 and/or CO2 barrier properties.

Preform according to the preceding claim, characterized in that the aforementioned organic component consists of EVOH or PVOH as a barrier material.

Preform according to one of the preceding claims, characterized in that said at least one coating layer is provided on the inside of the preform.

Preform according to one of the preceding claims, characterized in that the above-mentioned stretchable material is formed by PET, wherein the coating has a glass transition temperature value which is smaller than or equal to the one of PET.

Method for coating a preform made of a biaxialy stretchable plastics material, as defined in any one of the preceding claims, characterized in that the preform (10) is first coated from the outside and is then blown with formation of a container (20) according to a blow-molding process, wherein, during the blowing, the preform is heated to above the glass transition temperature of the abovementioned stretchable material, and subsequently biaxially stretched mechanically, notably wherein the coating has a glass transition temperature value which is smaller than or equal to the glass transition temperature value of the stretchable material.

Method according to the preceding claim, characterized in that for the VAC base layer, a water-borne VAC coating is selected as coating (3) for the primary PET layer of the preform wall (22), where in the process VAC has a fast drying time, a good adhesion to PET and wherein it stretches well when blowing of a preform, further wherein a VAC coating functionally exhibits a good chemical barrier for PET, and wherein it is also a good adhesion layer as a base layer (3) for other functional barrier coatings (5, 7) for the case that the latter do not have good adhesion to the PET wall layer (22).

Method according to the preceding claim, characterized in that the preform (10) is positioned over a metal pin (73) which is earthed to the mass (72), wherein at the time that an electrostatically charged coating is sprayed, the charged droplets are directed to the pin by the electric field and which finally end up on the preform to be coated.

Method according to the preceding claim, characterized in that the preforms are positioned during the post cooling process on a take-up core (74), wherein said cores are mounted on a gripper arm (75) which is connected to the ground (72) via the preform injection molding robot (70), wherein the preforms (10) are coated by an electrostatic process at that time, without additional manipulation therefor in the production process.

Method according to any one of the preceding claims, characterized in that the at least one coating layer (4) is applied on the inside of the preform (10), particularly for the sake of avoiding hydrolysis of the stretchable material by the filled product.

Method according to the preceding claim, characterized in that said cells are selected among the category of the so-called cysts and/or in the phase of the non-active or dormant stages;

• or resp. among the prokaryotes, in particular bacteria, and/or eukaryotes, particularly of the type protists, fungi, plants, and/or animals.

Method according to the preceding claim, characterized in that instead of, and/or possibly in combination with the yeast cells in the PBA an algae species is incorporated, the duration stages of which block very intense UV light.

Method for coating a plastic container (20) of the bottle type made of a biaxially stretchable material, provided with a coating, characterized in that at least one coating layer consisting of a polymer coating is applied on at least a portion of the plastic bottle preform, and in that said at least one coating layer is applied on the outside of the preform, particularly to avoid contact between the coating and food products to be preserved in the container.