Abstract:
A thermoplastic film is provided that includes a biaxially-oriented polyethylene terephthalate (PET) layer, a tensile strength in the longitudinal and transverse directions of about 2000 kg/cm2 or 3000 kg/cm2 or more, and a tear force in the longitudinal direction that is about 1.5 times as large as a tear force in the transverse direction. Such a film can include two or more layers. Processes for producing the thermoplastic film are also provided.
Abstract translation:提供了一种热塑性膜,其包括双轴取向的聚对苯二甲酸乙二醇酯(PET)层,纵向和横向的拉伸强度为约2000kg / cm 2或3000kg / cm 2以上,以及纵向上的撕裂力, 是横向撕裂力的1.5倍左右。 这样的膜可以包括两层或更多层。 还提供了用于生产热塑性膜的方法。
Abstract:
A reticulated thermoplastic film includes a backing with openings and discrete elements protruding from the first major surface. There are two discrete elements aligned in a first direction abutting opposite ends of any given opening. In a second direction perpendicular to the first direction, there is one discrete element between the given opening and an adjacent opening aligned in the second direction. Each portion of the backing around the given opening is plastically deformed in its lengthwise direction and typically has higher stretch-induced molecular orientation at its edge adjacent the given opening than at its midpoint. The openings are often retractable. A method of making a reticulated thermoplastic film is also disclosed. The method includes stretching a thermoplastic backing with a plurality of discrete elements in the first direction. Subsequently stretching the backing in the second direction forms a tear in the backing between two adjacent discrete elements.
Abstract:
The invention relates to a method for producing a perforated film (1), wherein a film body (2) is produced from a plastic melt, in which film body (2) slits (6) and/or thin points are made, or which film body (2) is produced at least approximately in a lattice-shaped manner or is provided with a lattice-shaped structure, and subsequently the film body (2) is stretched, in particular biaxially in a longitudinal direction and in a transverse direction, to produce a structure with longitudinal slats (3) which are connected to one another by transverse slats (4), with the formation of apertures (5), wherein the proportion of the material of the plastic is distributed non-uniformly to the longitudinal direction and the transverse direction of the film body (2). Furthermore, the invention relates to a corresponding perforated film.
Abstract:
Methods of increasing the perceived thickness and strength of a thermoplastic film include incrementally stretching thermoplastic films in the machine direction. In one or more implementations, methods of incrementally stretching thermoplastic films include reducing the gauge of the films while increasing a loft of at least a portion of the film. The methods can involve cold stretching the films and imparting rib patterns and alternating peaks and valleys into the film. The linear ribs can have alternating thick and thin gauges.