Mobil Oil Corporation

Extrusion Dies, Inc.

Gregory M Wilson

Donald R Garton

Vernon J Krupa

Harry G Lippert

John W Ryan

An extrusion apparatus includes first and second die body portions each having a main body and a lip interconnected with the main body wherein the die body portions are joined such that a single die outlet is formed between and bounded by the lips. The apparatus also includes suitable structure for moving the lips to adjust the die outlet.

Dual flexible lip extrusion apparatus

The present invention relates to a method for making a multilayer coextruded thermoplastic stretch wrap film useful for the packaging or pelletizing of goods. More particularly films made according to this invention include at least three layers: two outer layers and an intermediate layer positioned between the outer layers. The intermediate layer contains a mixture of a first linear low density polyethylene and a polyolefin selected for the group consisting of homopolymers of propylene, copolymers of propylene and ethylene and mixtures thereof. At least one of the two outer layers is a second polyethylene. The force required to stretch films made according to this method is controlled by varying the intermediate layer blend ratio between 85% polyethylene/15% propylene and 95% polyethylene/5% propylene.

Method of making a multilayer coextruded polyolefin stretch wrap film

An extrusion apparatus for extruding thermoplastic material includes first and second die body portions that define a manifold which has a back line and is in fluid communication with an outlet through which the thermoplastic material is extruded and wherein the back line is substantially parallel to the outlet. First and second body bolts join the first and second die body portions together. The first and second body bolts are disposed at first and second equal distances, respectively, from the back line and are further disposed on opposite sides of a centerline of the extrusion apparatus at third and fourth unequal distances therefrom, respectively, and are substantially equally spaced from the outlet.

Apparatus for extruding thermoplastic materials

The present invention relates to multilayer coextruded thermoplastic stretch wrap films useful for the packaging or palletizing of goods. More particularly the films of this invention include at least three layers, the three layers having two outer layers and an intermediate layer positioned between said outer layers, the intermediate layer comprising a mixture of a first linear low density polyethylene and a polyolefin selected from the group consisting of homopolymers of propylene, copolymers of propylene and ethylene and mixtures thereof and at least one of the two outer layers comprising a second linear low density polyethylene. The force required to stretch the films of this invention may be controlled by the ratio of polyethylene to the selected polyolefin of the intermediate layer, by controlling the thickness of the intermediate layer relative to overall film thickness, by controlling the melt flow properties of the intermediate layer polyolefin resin or by a combination thereof.

Multilayer coextruded polyolefin stretch wrap films

The present invention relates to novel multi-layer coextruded thermoplastic stretch wrap films useful for the packaging or palletizing of goods. More particularly the films of this invention comprise at least three layers having two outer layers and at least one intermediate layer placed between the outer layers. The intermediate layer is formed from a high pressure low density polyethylene resin and the outer layers are formed from a linear low density polyethylene copolymer such as ethylene copolymerized with a minor amount of at least one C.sub.4 to C.sub.10 alpha-olefin, such as hexane-1, octene-1, decene-1, 4-methyl-pentene-1 and butene-1. The force required to stretch the novel films of this invention may be controlled by the thickness of the intermediate layer relative to overall film thickness, the melt index of the intermediate layer resin, the molecular weight of the intermediate layer resin or a combination thereof.

Multi-layer coextruded polyolefin stretch wrap films

The present invention relates to novel multi-layer coextruded thermoplastic stretch wrap films useful for the packaging or palletizing of goods. More particularly the films of this invention comprise at least three layers having two outer layers and at least one intermediate layer placed between the outer layers. The intermediate layer is formed from a high pressure low density polyethylene resin and the outer layers are formed from a linear low density polyethylene copolymer such as ethylene copolymerized with a minor amount of at least one C.sub.4 to C.sub.10 alpha-olefin, such as hexene-1, octene-1, decene-1, 4-methyl-pentene-1 and butene-1. The force required to stretch the novel films of this invention may be controlled by the thickness of the intermediate layer relative to overall film thickness, the melt index of the intermediate layer resin, the molecular weight of the intermediate layer resin or a combination thereof.

The present invention relates to multi-layer coextruded thermoplastic stretch wrap films useful for the packaging or palletizing of goods. More particularly the films of this invention include at least three layers having two outer layers and at least one intermediate layer placed between the outer layers. The intermediate layer is formed from a high pressure low density polyethylene resion and the outer layers are formed from a linear low density polyethylene copolymer such as ethylene copolymerized with a minor amount of at least on C.sub.4 to C.sub.10 alpha-olefin, such as hexene-1, octene-1, decene-1, 4-methyl-pentene-1 and butene-1. The force required to stretch the films of this invention may be controlled by the thickness of the intermediate layer relative to overall film thickness, the melt index of the intermediate layer resin, the molecular weight of the intermediate layer resin or a combination thereof.

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Eau Claire, WI, United States of America

Gregory M Wilson