In order to provide a polyethylene sealant film having great strength and good heat sealability, despite being thin, a multilayer polyethylene sealant film is produced by a method including coextruding and stretching a sealant layer formed of a low density polyethylene resin or linear low density polyethylene resin and an orientation layer including a polyethylene resin having a melting point higher than the sealant layer, by an inflation method at a temperature higher than the melting point of the sealant layer and higher than the Vicat softening temperature, but lower than the melting point of the orientation layer.

The present disclosure provides: a biodegradable nonwoven fabric for thermoforming, the biodegradable nonwoven fabric being composed of a fiber of a polylactic acid-based polymer, and having a basis weight of 20-300 g/m.sup.2, preferably, a biodegradable nonwoven fabric characterized by being composed of a long fiber of a polylactic acid polymer, having an MD-direction elongation of 50% or more at 120 C., and having an MD-direction dimensional change rate of 4% or less at 80-140 C. as determined by thermomechanical analysis; a method for producing a molded body by using said biodegradable nonwoven fabric; and a method for molding a biodegradable beverage extraction container, the method being characterized in that the molded body has an MD-direction elongation change rate of 4% or less, as determined by thermomechanical analysis (TMA) under a load of 0.05 N/2 mm at 30-100 C.

An apparatus for producing an easy-to-tear plastic film comprising a pattern roll rotatably supported by a pair of stationary frames, an anvil roll moving along a pair of movable frames, a first driving unit for rotating the movable frames, and second driving units each mounted to the movable frame to move the anvil roll up and down; high-hardness, fine particles projecting from a rolling surface of the pattern roll having such average height and maximum height as enabling the formation of unpenetrating fine pores in a plastic film; with the anvil roll inclined to the pattern roll in a horizontal plane by the operation of the first driving unit, large numbers of unpenetrating fine pores being formed transversely uniformly in the plastic film passing through a gap of both rolls.

The present invention relates to a reinforced thermoplastic film comprising a base film wherein the base film comprises a stretchable polyolefin material comprising one or more layers and a plurality of extruded reinforcing fibre elements. The extruded reinforcing fibre elements are located on at least one surface of the base film and form fibre protrusions relative to the surface plane of the base film. At the location where each reinforcing fibre element is provided on the base film, an interface is formed comprising direct interactions between a base film domain and a protrusion domain. The base film domain is a domain of pure base film material and the protrusion domain is a domain of pure reinforcing fibre element material. The interface between the base film domain and the protrusion domain is interrupted by one or more discrete intermixed domains, wherein the intermixed domains comprise a material mixture comprising the base film material and the reinforcing fibre element material. The one or more intermixed domains partially interrupt the direct interactions at the interface between the base film domain and the protrusion domain. Furthermore, the one or more intermixed domains have interfaces and direct interactions with the base film and protrusion domains. The average thickness of the base film is less than the average thickness of the fibre protrusion. The films of the invention have controllable physical and mechanical properties such as tensile strength, elongation at break, tear resistance, coefficient of friction and adhesion.

Wax-based compositions for making barrier layers used in oral treatment devices are thermally stable when formed into a flat sheet or three-dimensional article to a temperature of at least 45? C. and are plastically deformable at room temperature (25? C.). The wax-based compositions include a wax fraction homogeneously blended with a polymer fraction. The wax fraction includes at least one wax and the polymer fraction includes at least one polymer selected such that, when the at least one wax and at least one polymer are homogeneously blended together, they yield a wax-based composition having the desired properties of thermal stability and plastic deformability. Barrier layers and oral treatment devices made from such wax-based compositions are dimensionally stable to a temperature of at least 40? C. without external support and can be plastically deformed in a user's mouth to become at least partially customized to the size and shape of user's unique dentition.

A multilayer film having coextruded layers comprising a znLLDPE-based core layer, and mLLDPE-based outer layers on each side of the core layer comprising, wherein the znLLDPE of the core layer has a density which is less than 0.005 g/cc different from a density of the mLLDPE of the outer layers, and wherein the znLLDPE of the core layer has a melting temperature which is less than 15 C. different from a melting temperature of the mLLDPE of the outer layers.

A multilayer film including a barrier layer, a sealing layer, and an alcohol barrier layer. The alcohol barrier layer includes cyclic olefin copolymer and is positioned between the barrier layer and the sealing layer. The multilayer film can be used to form a pouch for containing an alcohol-based hand sanitizer.

The present invention is directed to a multilayer bag with one or more embossed layers of polymeric film and a method to form the same. The embossed layers may provide improved shock resistance, tear resistance, and allow the bag to easily stretch and expand. Each layer of the polymeric bag may be embossed separately and then combined into a multilayer web. For certain embodiments, only one layer of the multilayer bag may be embossed. The individual layers may be formed from opposing sides of a collapsed tube of polymeric film or be formed from two distinct collapsed tubes of polymeric film. The polymeric bag may be a drawstring trash bag with the embossed pattern only extending a partial height of the bag.

Provided are a tube that has high inner-surface smoothness and outer-surface smoothness and a thickness distribution with a small variation, and a method for manufacturing the tube. The tube includes points a, b, c, and d that satisfy the following conditions (1) and (2): (1) 0.9<Rea/Rec<1.1 and 0.9<Reb/Red<1.1; and (2) Rea/Reb0.9 or Rea/Reb1.1. The points a, b, c, and d are four random points that are located on the circumference of the tube on any cross section in the axial direction of the tube, and are aligned in the stated order in a circumferential direction. Rea, Reb, Rec, and Red respectively indicate retardations at the points a, b, c, and d. The tube satisfies the following condition (3): (3) (10-point standard deviation/10-point average)1002 in the respective sets A, B, C, and D. Each of the sets A, B, C, and D includes retardations at ten random points present in a range between the point a, b, c, or d and a point 5 mm away from that point in the axial direction.

A method for improving tear resistance of stretch films in which two stretch films are bonded together with an adhesive by hot rolling or UV curing such that their primary stretch directions cross each other. Composite films resulting from the invention possess significantly improved slit tear strength and tear resistance over biaxially stretched films with the same thicknesses. The invention can be widely used to improve tear resistance of stretch films fabricated from various existing materials and processes. In addition, it allows simple operations and is readily applicable to mass production.