7 results about "Celluloid" patented technology

The invention provides a celluloid nitrocotton stability quantitative determination method based on conductivity analysis, and the method comprises the following steps: determining the conductivity of standard nitrogen oxide gas dissolved in an aqueous solution by adopting a conductivity meter through a standard gas simulation mode according to the criterion of Beckmann-Lockg method 2mL / g; taking the numerical value as a stability index critical value of the celluloid nitrocotton; the method comprises the following steps: absorbing nitrocotton with the same mass by using ultrapure water, heating at 132 DEG C for 2 hours, releasing nitrogen oxide gas, recording the change value of the conductivity in the solution along with time in real time by using an oxidation stability tester, obtaining the change value of the conductivity after 2 hours, and determining the content of nitrogen oxide according to the comparison between the conductivity value and a critical value. And judging whether the stability of the celluloid nitrocotton sample is qualified or not. The method provided by the invention can solve the technical problem that accurate quantitative judgment is difficult to realize due to large sample quantity, high safety risk, tedious operation process and large color change error of test paper observed by human eyes in the traditional method.

The invention relates to the technical field of sports equipment manufacturing, in particular to a high-performance environment-friendly table tennis ball production process based on ABS resin. The PC resin and the ABS are introduced to form the alloy, and the MBS flexibilizer and the SMA compatilizer are supplemented, so that the rigidity, the impact strength and the stress cracking resistance of the material are remarkably improved. The produced table tennis ball is resistant to falling and hitting, the service life of the table tennis ball is far longer than that of a traditional celluloid ball and a table tennis ball made of a single ABS material, and the table tennis ball can bear high-strength hitting of professional athletes. According to the present invention, the flammable and explosive celluloid material is completely abandoned, the matrix resins ABS and PC and all the auxiliary agents are the environmentally-friendly materials, the production process has no high-risk hidden danger and no toxic and harmful substance release, the modern green manufacturing idea is met, and the product has no burden on the environment after the use and the waste.

This invention discloses a celluloid composite film for out-of-mold decoration processes and its manufacturing method. The composite film comprises, from bottom to top, an injection molding substrate, a polyurethane adhesive layer, a celluloid decorative film layer, a high-transparency polyurethane adhesive layer, and a protective film layer. The injection molding substrate is a PC or ABS injection molded part; the protective film layer is a PMMA or PC film; the polyurethane adhesive layer is used to firmly bond the celluloid decorative film layer to the injection molding substrate, and the high-transparency polyurethane adhesive layer is used to firmly bond the protective film layer and the celluloid decorative film layer together. The aforementioned celluloid composite film for out-of-mold decoration processes, through its composite structure design of the injection molding substrate, polyurethane adhesive layer, celluloid decorative film layer, high-transparency polyurethane adhesive layer, and protective film layer, avoids the defects of poor weather resistance, easy yellowing, poor solvent resistance, and low surface gloss inherent in using celluloid film alone. The double-layer polyurethane adhesive layer enables tight bonding between the film layers, ensuring the overall structural stability of the composite film.

This invention discloses a celluloid hot pressing molding apparatus and method, including a hot press box and a straightening component. The hot press box has a material discharge hole at the top, a main support column is provided on the inner wall of the hot press box, a punch is provided on the circumferential surface of the main support column, and a concave die is fixedly installed on the right side of the inner wall of the hot press box. The straightening component includes a main support plate, a lead screw, a slide groove, a pressure plate door, an anti-tilting plate, a protective groove, a limiting hole, a moving groove, a protective frame, a limiting plate, and an anti-tilting spring. The protective frame slowly deforms, causing the anti-tilting plate to slowly move upward to adjust the tilted celluloid plate. The slow deformation of the protective frame allows the anti-tilting plate to adjust the celluloid plate in a gradual manner, thereby ensuring that the edge of the celluloid plate is evenly pressed and preventing excessive friction between the anti-tilting plate and the celluloid plate from causing the celluloid plate to shift position. This invention has the characteristic of preventing the celluloid plate from tilting during hot pressing.

The celluloid hot press forming device comprises a hot press box and further comprises a righting assembly, a discharging hole is formed in the top of the hot press box, a main supporting column is arranged on the inner wall of the hot press box, a male die is arranged on the circumferential face of the main supporting column, and a female die is fixedly installed on the right side of the inner wall of the hot press box; the righting assembly comprises a main supporting plate, a lead screw, a sliding groove, a pressing plate door, an anti-inclination plate, a protection groove, a limiting hole, a moving groove, a protection frame, a limiting plate and an anti-inclination spring, and the protection frame slowly deforms to enable the anti-inclination plate to slowly move upwards to adjust the inclined celluloid plate; and the protection frame slowly deforms, so that the anti-inclination plate can adjust the celluloid plate in a progressive manner, the edge of the celluloid plate is uniformly pressed, the position deviation of the celluloid plate caused by overlarge friction force between the anti-inclination plate and the celluloid plate is prevented, and the celluloid plate hot pressing device has the characteristic of preventing the position inclination of the celluloid plate during hot pressing.

The invention relates to the technical field of sports equipment manufacturing, in particular to a method for preparing celluloid-free table tennis balls. According to the invention, all petroleum-based plastics and celluloid are completely abandoned, and the main body materials PBAT and PLA are derived from renewable resources (such as corn and starch) and can be biodegraded under specific conditions. And the additive is also environment-friendly, so that the end treatment of the life cycle of the product has no environmental burden, and the whole process from the raw materials to the product is greened.

The celluloid composite decorative membrane for the OMD decorative process comprises a base membrane, and the base membrane is a transparent membrane made of a PMMA (polymethyl methacrylate) material; the celluloid film layer is used for providing special textures for the diaphragm; the cementing layer is formed by coating UV glue and curing, and is used for adhering the celluloid film layer to the lower surface of the base film; the bonding layer is formed by coating a bonding agent on the lower surface of the celluloid film layer; and the protective film is attached to the lower surface of the bonding layer in a peelable manner. According to the invention, the PMMA base membrane is compounded on the celluloid membrane layer, and a specific UV gluing process and a bonding structure are adopted, so that the overall weather resistance and yellowing resistance of the membrane are improved, and the PMMA base membrane has excellent ultraviolet stability and aging resistance; the mechanical strength and the surface wear resistance of the membrane are enhanced, the base membrane is high in hardness and smooth in surface, good support and protection are provided for the whole membrane, the scratch resistance and the impact resistance of the membrane are improved, and the membrane is more suitable for the high-temperature and high-pressure environment in the OMD forming process.