摘要:
A method of extruding two or more closure elements onto a web includes extruding the closure elements through a die plate having a first aperture for a first closure element and a second aperture for a second closure element. The first aperture is spaced from and at least partially overlaps the second aperture in a lateral direction. The partial overlapping of the apertures allows the closure elements to be spaced very closely together on the web. The space between the apertures prevents extrudate streams forming the elements from bonding to each other. The closely spaced elements are extruded through the same die plate without an interconnecting portion therebetween.
摘要:
Methods for forming a thermoplastic film with an attached closure strip are disclosed. The film can be used to produce zippered reclosable plastic bags. The methods include providing a thermoplastic film web having a sealing surface and a closure strip having a binding surface, both being in a non-melted condition. The film web and the closure strip are aligned in non-overlapping relationship and a heated thermoplastic binder layer is positioned on the film web sealing surface and on the closure strip binding surface quickly after extrusion. The hot binder layer transfers enough heat to the closure strip and to the film web to melt the closure strip binding surface and the film web sealing surface. Pressure is applied to seal the closure strip to the film web. An apparatus for practicing the method and a reclosable bag formed from the thermoplastic film with attached closure strips are also disclosed.
摘要:
A pouch including opposing sidewalls sealed together in a closed distal portion to form an interior that is accessible by a proximal opening. A closure profile extends along an interior surface of the opposing sidewalls for selectively sealing the proximal opening, wherein the closure profile substantially extends a length of the proximal opening. A plurality of tactile strips are disposed on an interior surface of at least one of the opposing sidewalls between the closure profile and the proximal opening, the tactile strips being variably spaced. Preferably, each tactile strip has a well-formed triangular cross-sectional shape with a height from the respective sidewall approximately double a thickness of the respective sidewall.
摘要:
A zipper for a reclosable bag including an elongated groove profile having two arms which form a general U-shape to define an opening to a channel, and an elongated rib profile opposing the groove profile, wherein a plurality of first segments of the rib profile alternate with a plurality of second segments of the rib profile to create a structural discontinuity along a length thereof, wherein during interlocking the groove and rib profiles, an audible clicking sound of at least 50 dB on average is created during opening and closing.
摘要:
An enhancement to a closure mechanism includes at least one flange that extends upwardly from an interlocking member of the closure mechanism. A line of transverse indentations is formed into the flange parallel to the interlocking member.
摘要:
A reclosable pouch comprises a body portion having first and second pouch walls. A first closure mechanism is disposed on internal sides of the first and second walls. The first closure mechanism includes a first female profile having first and second spaced legs and a first male profile. A second closure mechanism is disposed on the internal sides of the first and second pouch walls. The second closure mechanism includes a second female profile having third and fourth spaced legs and a second male profile. One of the first, second, third, or fourth spaced legs is longer than the other leg of the same female profile. Further, the first and second closure mechanisms comprise differing opening and closing characteristics.
摘要:
A method and apparatus for forming a rib on a section of plastic film utilizes a roll having a groove, extrudes molten polymer into the groove, and places the section of plastic film in contact with the molten polymer in the groove. The molten polymer in the groove is allowed to cool below the melting point thereof while the section of plastic film is in contact with the polymer to cause bonding therebetween and thereby form the rib.
摘要:
Miscible blends of poly-2-oxazolines and thermoplastic polymers are disclosed herein. These blends exhibit a single glass transition point indicative of a miscible blend. The blends of this invention are useful as membranes, particularly separation membranes for mixtures of organic compounds or organic compounds and water and pervaporation process.
摘要:
A pouch including a first sidewall. A second sidewall connects to the first side sidewall so as to form an interior of the pouch with an opening to the interior. A closure mechanism extends along an interior surface of the first sidewall for sealing the opening. The closure mechanism extends from one end of the opening to an opposite end of the opening. A first tactile strip is disposed on an exterior surface of the first sidewall and is spaced above the closure mechanism. A second tactile strip is disposed on the exterior surface of the first sidewall and is spaced below the closure mechanism. An exterior surface of at least one of the first tactile strip and the second tactile strip is provided with a texture, with the texture including a plurality of openings that open into the exterior surface. A smooth region is formed on the exterior surface of the first sidewall. The smooth region is disposed opposite to the closure mechanism and extends between the first and second tactile strips.
摘要:
A zipper for a reclosable bag including an elongated groove profile having two arms which form a general U-shape to define an opening to a channel, and an elongated rib profile opposing the groove profile, wherein a plurality of first segments of the rib profile alternate with a plurality of second segments of the rib profile to create a structural discontinuity along a length thereof, wherein during interlocking the groove and rib profiles, an audible clicking sound of at least 50 dB on average is created during opening and closing.