Forming process of plastic terrestrial globe

Abstract

The invention discloses a forming process of a plastic terrestrial globe. The forming process comprises the following forming steps: S1, printing a map; S2, printing an adhesive; S3, forming blister locating holes; S4, blistering a plastic film to form a hemisphere plastic film; S5, stamping the edge of the hemisphere plastic film level, and stamping a round opening right in the middle part; S6, injecting a hot melting plastic at high speed from the round opening by using an injection molding head of an injection mold, enabling an injected plastic to rapidly fit with the hemisphere plastic film, tightly bonding through the adhesive; S7, mutually adhering two hemisphere plastic casings to form a plastic terrestrial globe casing; S8, installing a terrestrial globe bracket in round openings of the two hemisphere plastic casings, and making the terrestrial globe. A southern hemisphere map film and a northern hemisphere map film are firmly bonded with the plastic, the map films do not falloff easily and are not torn off easily, the southern hemisphere map film and the northern hemisphere map film are put in a plastic mold and are accurately located, cutting leftover materials like a peak is not needed after injection molding is finished, the injection molding is convenient and even, and a terrestrial globe bracket mounting hole is not additionally formed after the injection moldingis finished.

Description

technical field [0001] The invention relates to the technical field of processing technology of teaching instruments, in particular to a molding technology of a plastic globe. Background technique [0002] The globe is a common tool for imparting geographical knowledge to people, and it is also an indispensable teaching aid for teaching geography and earth knowledge to primary and secondary schools. In the traditional plastic globe technology, the globe is manually embedded with a 12-petal "boat-shaped" picture on a sphere, or the southern hemisphere is formed by combining the hemispherical plastic shell with the southern hemisphere map printing layer, and then using the hemispherical plastic shell to print the northern hemisphere map Layers are stacked to form the northern hemisphere, and the southern hemisphere and the northern hemisphere are stitched together to form a whole sphere. These two types of globes are difficult to make, time-consuming and laborious. The latitud...

AI Technical Summary

Problems solved by technology

[0004] However, the globe forming method described in the above-mentioned patent also has the following defects: one, the southern and northern hemispherical map films are not tightly bonded to the plastic, and the map film is easy to fall off and tear, especially the PVC map hemispherical film. , it is difficult to stick to the plastic material; secondly, the south and north hemispherical map films are placed in the plastic mold and positioned through the 2-3mm "visor". Third, when injection molding in the plastic mold, it is blocked by the map film of the southern and northern hemispheres, which is not convenient for injection molding, and the injection molding is uneven; A globe bracket installation hole is opened on the map film on the housing