SU1237458A1 - Mould for flashless manufacturing of articles of polymeric material - Google Patents

Description

The invention relates to the production of molded articles from a polymeric material and can be used for the manufacture of products without a layer, by compression, compression-molding or injection molding.

The purpose of the invention is to improve the quality of products by preventing the flow of a moldable material on the surface of a closing of forming elements.

FIG. 1 shows the proposed mold, cut; in fig. 2 is a view A of FIG. one.

The mold for flawless manufacturing of polymeric material contains upper 1 and lower 2 shaping elements with forming 3 and cover 4 and 5 cavities separated by dividing edges 6 and 7, and formed on the surfaces of the closure 8 and 9 of shaping elements channels 10 and 11, respectively, for connecting the enclosed cavities with the atmosphere. Located between the diverting channels 10 and 11, the areas of quince of the surfaces of the closure 8 and 9 are made wedge-shaped and turned with vertices towards the forming cavity 3.

The number of branch channels may vary depending on the properties of the material and their shape. In the proposed mold, the channels 10 are made in the form of bald spots on the upper forming element 1, and the channels 11 are in the form of grooves on the same element.

The mold works as follows.

A preform of a polymeric material is loaded into the forming cavity 3 and the forming elements 1 and 2 approach each other under the influence of the closing force. As the mold closes, the gap between the mating surfaces of the closure of the upper 1 and lower 2 forming elements gradually decreases. In this case, the polymeric material fills the forming cavity 3, and its surplus flows into the cladding cavities 4 and 5 and further into the drainage channels 10 and 11, where oriented material flows are formed due to the wedge-shaped sections a and. Then the separating edges b and 7 are separated by an obla from the product LIA when the mold is fully closed. The wedge-shaped quince areas prevent head-on collision of the removed excess material from the closure surfaces and cut the material into oriented streams that are directed into the drainage channels,

0 which prevents the ingress of material on the surface of the clamping forming surfaces. As a result, the mold is fully closed and the flap is securely separated from the product by the edges 6 and

5 7. Then the product is polymerized at a given technological mode. At the end of the polymerization process, the mold is opened and the finished billetless product is removed from the mold, and the sheet from the enclosed cavities is removed by means of the drain in the drainage channels, which for this purpose are sufficiently wide, not very deep and without overflow channels.

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Compiled by V. Baturov

Editor ne. CerelaTehred I. Veres Proofreader V. Btd; |

Order 3241/19 Circulation 640 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PSP “Patent, Uzhgorod, st. Project, 4

Claims (1)

PRESS FORM FOR UNINTERRUPTED MANUFACTURE OF PRODUCTS FROM POLYMERIC MATERIAL, containing forming elements with forming and clouded cavities separated by a dividing edge, and outlet channels made on the contact surface of forming elements for communicating the broken cavity with the atmosphere, characterized in that, in order to increase the quality products due to the prevention of leakage of the moldable material on the contact surface of the forming elements located between the outlet channels, the sections of the contact surface The maneuvers are made wedge-shaped and turned vertices to the forming cavity. No. СО 4 ^ SL QO FIG. 1