80results about How to "Improve tearability" patented technology

A double-sided adhesive tape having a continuous series of toothed notches of about 0.3 mm to 6 mm jag height which easily transversely tearable by hand.

The invention relates to an easy-tearing type dry composite sheet. The easy-tearing type dry composite sheet comprises a body, wherein a printing layer, a base layer and a heat sealing layer are arranged on the body from top to bottom in sequence; the printing layer is a casting polypropylene film; the base layer is polyethylene glycol terephthalate; and the heat sealing layer is a polyethylene film. The easy-tearing type dry composite sheet has the advantages that the casting polypropylene film, the polyethylene glycol terephthalate and the polyethylene film are compounded into the body; the casting polypropylene film has good printing and stretching and forming performances, the polyethylene glycol terephthalate has good forming performances, and the polyethylene film has easy-tearing performance, so that the produced body is enabled to have a good printing effect, heat sealing performance, easy-tearing performance and forming performance, and the good forming effect is ensured during on-line processing, so that formed printed pattern is exquisite and not obviously deformed, good in heat sealing effect while being used by a consumer, and can be easily torn apart.

The invention relates to a novel aqueous protective spray film. The novel aqueous protective spray film is prepared from a component A and a component B, wherein the weight ratio of the component A to the component B is (3 to 8): 12; the component A contains the substances in parts by weight: 30-40 parts of aliphatic polyester polyurethane and 60-70 parts of water; the component B contains the substances in parts by weight: 75-90 parts of modified aqueous polyurethane resin, 0.5-5 parts of adjuvant and 5-15 parts of water; the modified aqueous polyurethane resin is subjected to grafting modification by a vinyl sulfocompound.

To provide a double-sided pressure-sensitive adhesive tape for fixing aircraft parts which is excellent in terms of hand tearability, flame retardance, and removability in a well-balanced manner. A double-sided pressure-sensitive adhesive tape for fixing aircraft parts which is a double-sided pressure-sensitive adhesive tape having pressure-sensitive adhesive layers on both sides of a substrate having hand tearability, characterized in that when S represents an pressure-sensitive adhesive strength of one pressure-sensitive adhesive layer (I) and W represents an pressure-sensitive adhesive strength of the other pressure-sensitive adhesive layer (II), the W is 2-20 N/25 mm and S/W is 1.5 or larger, and the double-sided pressure-sensitive adhesive tape passes the flammability test as provided for in FAR25.853(a)app.F.Part1(a)(1)ii.

The invention relates to a manufacturing method of a large-thickness steel plate for ensuring the lamellar tearing resistance of a core part by continuous casting billet production. The manufacturingmethod comprises the following steps of selecting a continuous casting blank according to the thickness of the steel plate and the grade of the steel type; after the primary smelting of the converter,LF refining and RH vacuum refining processes are strictly controlled to produce high-cleanliness molten steel, then the high-cleanliness molten steel is controlled through a special continuous cast steel process to obtain the continuous casting slab with central loose and center segregation meeting requirements, the steel plate with good anti-lamellar tearing performance is produced through controlled rolling and cooling of the continuous casting slab, and finally the final performance is achieved through heat treatment. The thickness of the steel plate is larger than 80 mm-150 mm, the anti-lamellar tearing performance is excellent, the shrinkage rate of the Z direction (thickness direction) stretching section at a half of thickness is larger than 35%, the steel plate can be widely applied to construction of steel structures such as large bridges and high-rise buildings.

The invention relates to a three-layer co-extrusion blow-molding polypropylene thin film and a preparation method and an application thereof. The polypropylene thin film is formed by three-layer co-extrusion blow molding of an outer-layer material forming an outer layer, a middle-layer material forming a middle layer and an inner-layer material forming an inner layer, wherein the middle-layer material is formed by blending homo-polypropylene, random copolymerized polypropylene and polystyrene. The polypropylene thin film is a non-notched and easy-tearing polypropylene thin film formed by three-layer co-extrusion blow molding, has the advantages of good easy-tearing property, high temperature resistance, good sterilization, good welding performance and the like, and satisfies the material performance requirements in the fields of medical packaging and food packaging.

The invention discloses a preparation method of a modified casting polypropylene film and an easy-to-tear PET-AL-CPP composite film. The invention aims to solve the problems that CPP in an existing PET-AL-CPP composite film is good in toughness and a flexible packaging bag prepared from the existing PET-AL-CPP composite film and used for packaging a liquid medicine is not easy to tear, poor in linear tearing performance and prone to causing splashing or side leakage of the liquid medicine. The preparation method of the invention comprises the following steps: adding 1-5 parts of a silicon dioxide coated aluminum oxide nanomaterial into 95-97 parts of polypropylene resin, and carrying out blending, melting and granulating to obtain a polypropylene inner-layer mixture; and 2, extruding polypropylene outer-layer resin and the polypropylene inner-layer mixture of obtained in the step 1 to obtain the polypropylene film. The film prepared in the invention has the advantages of good comprehensive performance, easiness in tearing, good linear tearing performance and the like.

The invention discLoses doubLe-face tearabLe fabric for medicaL adhesive tape and a processing method of the fabric and beLongs to the technicaL fieLd of textiLes. The doubLe-face tearabLe fabric forthe medicaL adhesive tape is characterized by comprising a fabric body which is formed by interweaving warp and weft, and poLyester modified fibers are adopted for the warp and the weft and obtained in the mode that third monomers containing hydrophiLic groups and/or fourth monomers containing hydrophiLic groups are added to poLyester fibers during a poLymerization reaction for modification treatment. The processing method comprises the steps of cyLinder preparation and roLLing, coLd pad-batch desizing, water washing reroLLing, in-cyLinder embrittLement, water washing out-cyLinder, finishing and formation and packaging storage in a warehouse. The fabric is durabLe and does not fLuff, the operation is simpLe, an operator more convenientLy uses the fabric, and more Labor is saved; accordingto the processing method, the fiber strength of the fabric body can be effectiveLy Lowered, and accordingLy the good tearabLe performance and effect of the fabric body are improved.

The invention discloses a cast chlorinated polyethylene (CPE) heat-sealing easy-tearing cover film and a preparation method thereof. The cast CPE heat-sealing easy-tearing cover film comprises a corona layer, an intermediate layer and a heat-sealing layer which are sequentially connected; the corona layer comprises the following raw materials in parts by weight: 76-80 parts of linear low density polyethylene (LLDPE), 18-22 parts of low-density polyethylene (LDPE), 0.8-1.2 parts of an opening slip agent and 0.8-1.2 parts of a processing aid; the intermediate layer comprises LLDPE; and the heat-sealing layer comprises the following raw materials in parts by weight: 8-12 parts of metallocene linear low density polyethylene (mLLDPE), 86-90 parts of modified waterborne polyurethane and 1.8-2.2parts of a processing aid. The cast CPE heat-sealing easy-tearing cover film has the advantages of being easily heat-sealed with cup bodies made of polyethylene terephthalate (PET)/polyvinyl chloride(PVC)/polystyrene(PS)/polyethylene(PE), and being easily torn and stripped.

The invention relates to a production device of an elasticity-adjustable gauze-fabric composite fabric. The production device comprises a spandex yarn unwinding roller used for unwinding spandex yarns, a non-woven fabric unwinding roller used for unwinding non-woven fabric, a gauze unwinding roller used for unwinding gauze and a composite fabric winding roller used for winding the composite fabriccoming out of a drying drum. An anilox gluing roller is immersed into a glue tray, the non-woven fabric unwinding roller is arranged at a feeding port of the anilox gluing roller, and the anilox gluing roller uniformly transfers glue in the glue tray to coat the surface of passing non-woven fabric with the glue; a yarn dividing needle plate is arranged in the discharging conveying direction of the spandex yarn unwinding roller, and unwound spandex yarns are evenly separated and then compounded on the non-woven fabric glue surface coated with the glue; and the gauze unwinding roller is arranged at the front end of a feeding port of the drying drum, and the drying drum is used for compounding entered gauze and the non-woven fabric glue surface with spandex yarns to form the elasticity-adjustable gauze-fabric composite fabric. The composite fabric with excellent stability in elasticity and composite firmness is produced, and thus the requirements of different people are met.

The invention discloses an anti-welding adhesive tape. The anti-welding adhesive tape comprises a base material film layer, a reinforcing belt and a pressure-sensitive layer and is characterized in that: the reinforcing belt is coated on the surface of one side of the base material film layer; and the pressure-sensitive layer is coated on the surface of the other side of the base material film layer. The base material film layer is combined with the reinforcing belt structure, so that the original single-layer base material structure is changed into a double-layer composite structure, and the anti-welding adhesive tape has ideal high temperature resistance, is not shrunk and deformed during use at high temperature, is soft and comfortable and has high tearability.

The invention relates to a preparation method of breathable easy-to-tear elastic bandage cloth. The preparation method comprises the following steps of extruding a bright PET melt from three-leaf-shaped spinneret orifices with three leaves of different lengths on a spinneret plate (all the three-leaf-shaped spinneret orifices are distributed in a concentric circle manner, and the narrowest leaf ofeach three-leaf-shaped spinneret orifice is randomly distributed), carrying out cooling by adopting circular air blowing, preparing POY yarns according to a POY process, and carrying out air deformation to prepare polyester bright special-shaped yarns, wherein in the parameters of the POY process, the cooling speed is 2.0-2.5 m/s, and in the parameters of the air deformation, the overfeed rate ofa deformation area is 27-32%; and then carrying out weaving by taking the polyester bright special-shaped yarns as raw materials of warp yarns and weft yarns to prepare the breathable easy-to-tear elastic bandage cloth. The preparation method of the breathable easy-to-tear elastic bandage cloth is simple and feasible, and low in cost, and the prepared bandage cloth has relatively good elasticity,easy-to-tear property and breathability.

The invention relates to stretch cotton self-adhesive elastic bandage and a preparation method thereof. Self-adhesive glue layers are coated to front and rear sides of a base material, and the base material comprises pure cotton gauze and spandex which is bonded on the pure cotton gauze. The preparation method comprises the following steps: selecting the pure cotton gauze which has the yarn countof 16-30S, warp density of 25-35 yarns/2.54cm and weft density of 24-32 yarns/2.54cm; selecting the spandex being 60-150D for stitch bonding; bonding the spandex on the pure cotton gauze at an interval of 6-12 yarns/2.54cm; and coating self-adhesive glue to front and rear sides of the spandex-bonded pure cotton gauze, and performing drying and curing through an oven. Elasticity is provided to thepure cotton gauze by adopting a spandex stitch-bonding mode, and the product has excellent easy-to-tear performance, can be torn in horizontal and vertical directions and has an excellent air-permeable effect.

The invention discloses a bonding agent for a paper box adhesive tape and a processing process thereof. The adhesive tape is prepared from the following raw materials including butyl acrylate, iso-octyl acrylate, acrylic acid, hydroxyethyl acrylate, vinyl acetate, methyl acrylate, an antifoaming agent, an initiator and the like. The adhesive tape prepared from the bonding agent has good bonding performance and good easy-to-peel performance; the surface structure of a paper box is not damaged when the adhesive tape is peeled away.