摘要:
A method for perforating a film of plastic material in which a main film (1) is perforated whilst it is slid through a perforating device (5) by a plurality of pressurised hot gas jets having a temperature above the melting temperature of the main film, in which the hot gas jets are correlated with the sliding speed of the main film (1), and in which reinforcing bands obtained from an auxiliary film of plastic material (2) are connected to the perforated main film (1), making the reinforcing bands adhere between parallel rows of base holes; subsequently the perforated main film (1) with the reinforcing bands is stretched in the longitudinal sliding direction. During perforating, the main film of plastic material (1) is pressed against a perforating template (22), making the main film of plastic material (1) instantaneously penetrate openings of the perforating template (22) by said hot gas jets. A hot gas perforating device (5) is also disclosed, as well as an apparatus suitable for perforating and sliding a film of plastic material according to the referred method.
摘要:
Multi-layer films include at least one cavitated core layer that is microporous and breathable, and at least one skin layer. The cavitated core layer includes a polyolefin and an inorganic filler dispersed in the polyolefin. Methods for forming polymeric films and articles of manufacture prepared therefrom are described.
摘要:
Linear low density polyethylene (LLDPE) that is prepared with a single site catalyst has relatively low modulus in comparison to a polyethylene of similar melt index and density made with a conventional Zeigler Natta catalyst. Films that are prepared from polyethylene having a low modulus have a soft and flexible "feel", which is undesirable for some packaging applications. The present invention provides a method to increase the modulus of single site catalyzed linear low density polyethylene by mixing it with 10-2 wt. % of high density polyethylene and 200-10000 ppm of a nucleating agent.
摘要:
The invention is directed to a process for embossing a film comprising plasticized polyvinyl acetal with a roughness Rz on at least one surfaces of 20 to 100 μm by the process steps of a. extrusion of plasticised polyvinyl acetal to a film with a stochastic roughness of the surfaces of Rz = 1 to 70 μm, b. embossing of at least one surface of the film obtained in step a) with channels having a depth of 5 - 50 μm, a width of 10 - 200 μm and a pitch of 50 - 2500 μm, wherein c. the surface roughness of the elevations between the channels is at most 20% lower as obtained in step a).
摘要:
The present disclosure relates to a process for preparing of high thermal conductivity and high heat capacity oriented ultrahigh molecular weight polyethylene (UHMWPE) product. The process includes feeding UHMWPE through rollers to obtain a pre-laminate which is further hot stretched to obtain the oriented UHMWPE product having high thermal conductivity and high heat capacity. The temperature of stretching is maintained below the melt temperature of the UHMWPE throughout the entire process. There is also provided a high thermal conductivity and high heat capacity oriented UHMWPE product prepared by the process of the present disclosure. The oriented UHMWPE product is characterized in the axial thermal conductivity in the range of 70 to 200 W/mK, transverse direction thermal conductivity in the range of 0.022 to 0.045W/mK and heat capacity in the range of 6 to 25 MJ/m3K.
摘要:
Breathable, thermoplastic films, laminates, and methods of making films having a basis weight less than or equal to 15 gsm and a water vapor transmission rate of at least about 500 grams H20/24-hour/m2, wherein the film has a ratio of the MD load at break to the CD load at break of less than about 10, and at least one of a machine-direction notched Elmendorf tear strength of at least about 5 g or a machine-direction notched trapezoidal tear strength of at least about 15 g.
摘要翻译:透气性,热塑性薄膜,层压体和制造基重小于或等于15gsm的薄膜和至少约500克H 2 O / 24小时/ m 2的水蒸气透过率的方法,其中该薄膜的比例为 断裂时的CD载荷在小于约10的断裂处的MD载荷,以及至少约5g的机器方向切口的Elmendorf撕裂强度或至少约15的机器方向切口的梯形撕裂强度中的至少一个 G。
摘要:
The present invention provides a method of making a three-layer aliphatic thermoplastic polyurethane (TPU); surface protection composite. The method involves extruding- an aliphatic thermoplastic polyurethane (TPU) layer onto a substrate layer at the flat die extrusion nip -comprising a rubber roller in the back position and. a steel, roller in the front position; cooling the extruded aliphatic: thermoplastic polyurethane; feeding the two-layer thermoplastic polyurethane (TPU) composite film into a downstream nip comprising at least one rubber roller; and laminating a flexible polymer interleaf film onto the exposed thermoplastic polyurethane (TPU) side of the two-layer composite under pressure in that nip. The surface protection, composite of the present invention; may be included in a variety of products for use in automotive, electronics: or furniture applications
摘要:
Ein Verfahren zur Aufbereitung von Werkstoffen, insbesondere von Recyclinggut, bestehend aus Verbundstoffen oder Stoffverbunden, vorzugsweise Verbundfolie, bestehend aus mindestens zwei unterschiedlichen Materialien (6, 7), wobei die Materialien (6, 7) unterschiedliche Erweichungs- oder Schmelztemperaturen aufweisen, umfassend die folgenden Verfahrensschritte: − Einbringen des Werkstoffes in eine Aufbereitungseinrichtung (3), − Erwärmen des Werkstoffes bis zu einer Temperatur, bei der das Material mit der geringeren Erweichungs- oder Schmelztemperatur dichtere Agglomerate bildet, während das andere Material seinen ursprünglichen Zustand beibehält oder nur geringfügig ändert, − Ausbringen des Werkstoffes aus der Aufbereitungseinrichtung (3). Des Weiteren ist eine Vorrichtung zur Aufbereitung von Werkstoffen, insbesondere Recyclinggut, bestehend aus Verbundstoffen oder Stoffverbunden, vorzugsweise von Verbundfolie, bestehend aus mindestens zwei unterschiedlichen Materialien (6, 7), wobei die Materialien (6, 7) unterschiedliche Erweichungs- oder Schmelztemperaturen aufweisen, zur Durchführung eines Verfahrens beansprucht.