摘要:
Wrapping materials for photographic materials comprising laminated layers of a paper support and at least one thermoplastic resin layer superposed on at least one surface of said paper support; said thermoplastic resin layer comprises a blended resin of (a) a high-density polyethylene having a density of 0.950 g/cm.sup.3 or more and a melt index of 10-40 and (b) a low-density polyethylene having a density of 0.930 g/cm.sup.3 or less and a melt index of 1-40, the weight ratio of (b)/(a) being 70/30-5/95, preferably 70/30-20/80, more preferably 60/40-40/60.At least one layer of said wrapping materials optionally comprises light-shielding substance in an amount of 1.0-30 g/m.sup.2.
摘要翻译:包括用于照相材料的材料,其包括叠层在所述纸支架的至少一个表面上的纸支撑体和至少一个热塑性树脂层的层压层; 所述热塑性树脂层包含(a)密度为0.950g / cm 3或更高,熔体指数为10-40的高密度聚乙烯和(b)密度为0.930g的低密度聚乙烯的共混树脂 (b)/(a)的重量比为70 / 30-5 / 95,优选为70/30〜20/80,更优选为60/40〜40 / 60。 至少一层所述包裹材料任选地包括1.0-30g / m 2的遮光物质。
摘要:
This invention provides a packaging material for a photographic photosensitive material having a conductive light-shielding thermoplastic resin film layer which comprises a resin composition comprising 3 to 49 wt. % of a thermoplastic elastomer having a crystallinity of 40% or less measured by the X-ray diffraction method, 0.01 to 10 wt. % of lubricant, and 1 to 70 wt. % of carbon black which is acetylene carbon black or furnace carbon black, which is excellent in the dispersion of carbon black to improve light-shielding ability and rare generation of lumps and microgrits, heat sealing properties, small degradation of physical strength, film moldability, etc.
摘要:
A packaging material for photographic photosensitive materials consisting essentially of a cushioning sheet having a density of less than 0.5 g/cm.sup.3, a wear-resistant heat-resistant flexible sheet having a Young's modulus of not less than 50 kg/mm.sup.2 provided on one side of the cushioning sheet, and a wear-resistant flexible sheet having a Young's modulus of not less than 50 kg/mm.sup.2 provided on the other side of the cushioning sheet, the outer most layer provided on said the other side having heat sealability, and the packaging material having complete light-shielding ability as a whole, and a light-shielding bag for photographic photosensitive materials made by fusion to join the layers having heat sealability in the above packaging material. The packaging material for photographic photosensitive materials can be heat-sealed entirely and can continuously be made into a bag automatically by a simple general purpose heat sealer, such as a heat sealing bar or a heat sealing belt, while retaining its physical strength and at a high productivity.
摘要:
A process for producing a container is disclosed including molding the container using an injection molding machine with a multicavity mold having not less than 12 cavities by charging a hot runner thermoplastic resin having a melt flow rate of 5 to 80 g/10 minutes to the multicavity mold, wherein not less than 70% of the total injected resin amount at each shot is injected at an injection speed which is adjusted at 150 to 270 mm/sec., and the remaining resin at each shot is injected at a final injection speed which is adjusted at 3 to 90 mm/sec. By employing the process, molding troubles such as burrs, stringiness, short shot and weld lines do not occur, and the container can be molded continuously for a long period under unmanned conditions without screening inspection.
摘要:
A resin composition for forming a core for web material comprising 70 to 30 wt. % of polypropylene resin having a melt index of 10 to 60 g/10 minutes, a bending elastic modulus of more than 8,000 kg/cm.sup.2, an Izod impact strength of more than 2 kg.cm/cm and a Rockwell hardness of more than 70 R, 30 to 70 wt. % of linear low density polyethylene resin having a melt index of 3 to 50 g/10 minutes, a density of 0.910 to 0.935 g/cm.sup.3, an Olsen rigidity of more than 1,500 kg/cm.sup.2 and a Shore hardness of more than 40 D, more than 0.01 wt. % of a lubricant and more than 0.01 wt. % of an antioxidant.The resin composition is a light weight and excellent in injection moldability, appearance, dropping strength, solvent resistance, transparency, processibility, wear resistance, dimensional accuracy, and little molding troubles such as sink marks, resin remaining at gate, stringiness, weld lines, twist and deformation, add nevertheless, it has a flexibility.
摘要:
In a container for a roll of a light-sensitive strip material having a core on which the light-sensitive strip material is coiled to form a roll, an opening for drawing out the light-sensitive strip material and a teremp cloth provided on the above opening for shielding from light, wherein a filling layer formed of polyolefin copolymer resin usable as the adhesive layer for fixing the teremp cloth on the container body is provided at the ground fabric of the teremp cloth, and/or a multilayer coextruded film is laminated under the ground fabric of the teremp cloth, and the multilayer coextruded film has a tensile strength of more than 500 g/15 mm width and comprises an adhesive layer of an ethylene copolymer resin having a comonomer content of 5 to 36 % for fixing said teremp cloth on the container body and a thermoplastic resin base layer having a melting point of higher than the ethylene copolymer resin adhesive layer by 10.degree. C. or more and a Young's modulus of more than 15 kg/mm.sup.2.In this container, the filling material does not so deeply permeate into pile yarns, even though the ground fabric is not so dense. Adhesion of pile yarn dust hardly occurs, and troubles in exposure and development caused by the pile yarn dust are solved. By incorporating the multilayer coextruded film, the thickness of the adhesive layer for fixing teremp cloth on the container body is made uniform and various problems caused by non-uniformity in the thickness of the adhesive layer are solved.
摘要:
Resin compositions for use in molding articles by injection molding comprise 50 to 90 wt. % of polypropylene resin, 9 to 48.5 wt. % of linear low density polyethylene resin, 0.05 to 15 wt. % of light-shielding material, 0.05 to 40 wt. % of reinforcing material, 0.05 to 6 wt. % of lubricant, and oxidation inhibitor present in an amount of less than 0.5 wt. %. These resin compositions display very little mold shrinkage and have excellent size accuracy. They also have outstanding rigidity, physical strength, heat resistance, wear resistance and slipping characteristics. They are readily molded by injection molding, and are relatively inexpensive. Articles molded from the resin compositions according to the invention are well adapted for use as photographic photosensitive materials.
摘要:
Two packaging materials for photosensitive materials characterized by utilizing linear low density polyethylene (L-LDPE) resin having a specific character.One packaging material is a thick coextruded multilayer film comprising an L-DLPE resin film layer mainly composed of an L-LDPE resin specified by the density and the melt index (MI) and a polyethylene resin film layer blended with a medium or high density polyethylene resin having a high MFR, Melt fracture and blocking do not occur, and the film is excellent in flexibility, in spite of being a thick film.The other packaging material is a single layer film of a light-shielding L-LDPE resin film layer characterized by the combination of two kinds of L-LDPE resin. The packaging material is excellent in all physical strength, particularly tear strength and impact puncture strength, antiblocking property, antistatic properties, heat sealing properties and bag-making ability. The generations of lumps and fish eyes are rare, and the film moldabily is excellent.
摘要:
A core that is adapted to receive web material such as a wound film roll includes inner and outer coaxial cylinders joined together by a ring plate that extends perpendicular to the longitudinal axes of the inner and outer cylinders. A plurality of radially disposed ribs are positioned between and connected to the inner and outer cylinders. At least one projection is provided on the core at one of various places such as the inner surface of the outer cylinder or the outer surface of the inner cylinder. The projection increases frictional resistance between the mold core and the molded core, thereby ensuring the mold core will be ejected with the core from the mold cavity. The core is manufactured from a resin composition comprising 70 to 30 wt. % of polypropylene resin having a melt index of 10 to 60 g/10 minutes, a bending elastic modulus of more than 8,000 kg/cm.sup.2, an Izod impact strength of more than 2 kg.cm/cm and a Rockwell hardness of more than 70 R, 30 to 70 wt. % of linear low density polyethylene resin having a melt index of 3 to 50 g/10 minutes, a density of 0.910 to 0.935 g/cm.sup.3, an Olsen rigidity of more than 1,500 kg/cm.sup.2 and a Shore hardness of more than 40 D, more than 0.01 wt. % of a lubricant and more than 0.01 wt. % of an antioxidant.
摘要:
A sheet film package comprises a casing, a stack of sheet films stored in said casing, and a protective board disposed in said for protecting said sheet films. The protective board has a holder portion integrally joined to one side edge of an upper panel and/or a lower panel thereof for preventing the sheet films from being displaced in a direction transverse to the direction in which the sheet films wil be fed out. The sheet film package also includes a buffer sheet member disposed on the lower panel of the protective board for placing the sheet films on the buffer sheet member. The buffer sheet member has at least one opening such as a hole or a slit for leaking suction air in each of two symmetrical areas of the buffer sheet member, one of which will be contacted by a suction cup of a film delivery mechanism disposed in a device in which the sheet film package can be loaded. The buffer sheet member has a foamed sheet layer made of thermoplastic resin.