An electrofusion fiting (20) comprises a fitting body (24) and an electrofusion collar (26). The fitting body (24) has an exterior surface (30), an interior surface (32), and a terminal portion (44) extending to a rim (34). The collar (26) has: an inner wall (42) having a heating element (60); a segmented outer wall (40) spaced radially apart from the inner wall; and a linking portion (46) linking the outer wall and inner wall. The fitting body terminal portion is between the inner wall and the outer wall. The collar and fitting body have interfitting features (150, 152) axially retaining the collar against extraction from the fitting body while permitting relative rotation of the collar and the fitting body.

The invention relates to a method for producing tubular bags made from plastic film or from composite film having a plastic layer on the bag content side, having a self-cutting plastic closure attached to the tubular bag, consisting of a spout part having a fastening flange, a cutting body, which is movably guided in the spout part, and a screw cover having means for activating the cutting body. The film material (5) is supplied from a supply roll to a bag manufacturing machine and the plastic closure is sealed onto the film material in a spout region of a tubular bag. According to the invention, the film material (5) is thinned on the inside of the bag in a ring-shaped region, which is intended for cutting by the cutting body, by means of a thermal embossing process. The plastic closure is then positioned and sealed onto the film material such that the cutting organ embedded in the spout part can become effective in the thinned, ring-shaped region upon use thereof.

The invention relates to a method for producing tubular bags made from plastic film or from composite film having a plastic layer on the bag content side, having a self-cutting plastic closure attached to the tubular bag, consisting of a spout part having a fastening flange, a cutting body, which is movably guided in the spout part, and a screw cover having means for activating the cutting body. The film material (5) is supplied from a supply roll to a bag manufacturing machine and the plastic closure is sealed onto the film material in a spout region of a tubular bag. According to the invention, the film material (5) is thinned on the inside of the bag in a ring-shaped region, which is intended for cutting by the cutting body, by means of a thermal embossing process. The plastic closure is then positioned and sealed onto the film material such that the cutting organ embedded in the spout part can become effective in the thinned, ring-shaped region upon use thereof.

Disclosed are compositions, methods and uses for thin multi-layered films that may include a metallizable skin layer that include polyethylene polymer(s), wherein the metallizable skin layer may be treated one or more times. The multi-layered films include a core layer and a sealant layer, wherein each of these layers includes metallocene-catalyzed, linear, low-density polyethylene. The core layer is located between the metallizable skin layer and the sealant layer. These films may include one or more additives in any of the layers and/or include one or more tie layers. The multi-layered films may be biaxially oriented, have a haze equal to or below 5%, and have an elastic modulus equal to or below 350 N/mm.sup.2. The multi-layered films may also include a metallized layer on the metallizable skin layer, a coated layer on the metallizable skin layer, and/or be laminated to a polyethylene-based polymer, such as polyethylene terephthalate.

The present disclosure is directed to dunnage bags formed using polyethylene terephthalate (PET) and processes for manufacturing these PET dunnage bags. Generally, the PET dunnage bags of the present disclosure include a PET outer bag, an inner bladder enclosed within the PET outer bag, and a valve assembly that enables air to be introduced into (or escape out of) the inner bladder to inflate (or deflate) the inner bladder, thereby inflating (or deflating) the PET dunnage bag.

Microporous structures in face films are described for improving printability of the films. Also described are laminates and pressure sensitive adhesive laminates including the microporous structured face films. Various related methods are additionally described.

The present disclosure provides a multi-layer blown film, comprising: a first skin layer and a second skin layer, where at least one of the first skin layer and the second skin layer comprises from 80 to 100 wt. % of a LLDPE, where the LLDPE has a density from 0.910 to 0.935 g/cm.sup.3; a core layer between the first skin layer and the second skin layer, where the core layer comprises from 70 to 100 wt. % of a second LLDPE having density from 0.910 to 0.935 g/cm.sup.3; and a first inner layer and a second inner layer, where at least one of the first inner layer and the second inner layer comprises from 80 to 100 wt. % of a HDPE, where the HDPE has a density from 0.940 to 0.970 g/cm.sup.3; where the multi-layer blown film has a density from 0.925 to 0.940 g/cm.sup.3 and a total thickness of 15 to 150 μm.

A welder for joining two polymeric sheets together using a wedged heating element allows for a heating profile on opposite faces of the heating element to be varied by controlling where each of the polymeric sheets contacts the corresponding face.

A welder for joining two polymeric sheets together using a wedged heating element allows for a heating profile on opposite faces of the heating element to be varied by controlling where each of the polymeric sheets contacts the corresponding face.

A solar reactive mulch film comprising one or more layers of heat shrink material pre-strained at a predetermined temperature and tension. Immediately cooling the pre-strained layers retains molecular deformation stresses in the material which facilitate shrinkage but not expansion on exposure to solar radiation. The mulch film adapted to be laid over longitudinal growing beds and held tautly by burying its side edges in soil. Exposure of uncovered portions of film to solar radiation causes shrinkage in one or more directions whereby in combination with the weight of the soil holding it down, maintains tautness of the mulch over a growing period. Methods of manufacture and use of the same.