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The structure and classification of cap mould
2019-12-20
plastic bottle caps mould Structure, there are many more stringent indicators on the bottle cap mould itself, such as requirements for sealing performance, drop performance, heat resistance, opening torque and breaking cap mould performance. To produce qualified cap products, the accuracy of the mold is very high Claim.
(2) There is a ring of sealing ring and internal thread in the cover, and a ring of boss on the inside and outside of the lower anti-theft ring, with a diameter of about 2. The 18 thin connecting bridges of mm are connected to the bottle cap 7, and the bottle cap breaks once the bottle cap is opened. Plastic anti-theft bottle caps Typical injection mold structure Plastic bottle anti-theft caps were first produced by injection molding. After years of development, it has now formed a special injection molding machine for bottle caps and a supporting conveying and testing unit. Most of the molds are in the form of a hot runner system and a mold with multiple cavities. 32 cavities, 48 cavities, 64 cavities, and 72 cavities are the mainstream mold molds in foreign countries. Bottle caps are thin-walled injection molding. Although the volume is not large, the structure is relatively complicated. With the structure of thread and anti-theft ring, and the thin connection bridge between the bottle cap body and the anti-theft ring, the demolding becomes the main difficulty in the injection molding of the bottle cap. At present, there are mainly three mold forms to solve this problem. One is that the anti-theft ring part is in the form of a Huff block. In the mold opening stage, the Huff block of the anti-theft ring part is first opened, then the threaded part is forced out, and finally the entire lid is ejected by the inner top cover. The structure of this kind of mold is relatively simple. Generally, only two demouldings are needed, but the lateral volume of the mold is large, and the number of cavities is limited. The mold with the same number of cavities is heavy, and the specifications of the injection molding machine are correspondingly increased. The second method is to force the thread directly without processing the connecting bridge during injection molding, and then add a ring cutting process after injection molding. The production cost of this mold is relatively high. An additional ring cutting machine is required, and the production cost increases. However, the mold structure is simple, the mold processing cost is low, and the mold life is long. The third is to use a three-time demoulding mechanism and one-time molding. This mold structure is relatively complicated, and the relative movement between the mold forming parts during the injection process is relatively large. Therefore, the accuracy of the mold manufacturing and the strength and wear resistance of the mold material, etc. Have higher requirements, such as the accuracy of the relative motion between the parts are H7 / above. When the plastic is injected into the cavity and fully cooled, first the cavity fixing plate is separated from the anti-theft ring fixing plate, that is, the moving and fixed molds are separated; second, the anti-theft ring is pushed together with the middle threaded core, medium core and ejector core. The forward movement, separated from the bushing, disengages the plastic product from the bushing to achieve the first demoulding; then, the threaded core and the medium core stop moving, and the anti-theft ring core and the ejector core move forward together, That is, the middle center ejector is ejected, and the outer anti-theft ring core is pushed out to forcely pull out the internal thread and the inner convex ring of the anti-theft ring to achieve the second demolding
(2) There is a ring of sealing ring and internal thread in the cover, and a ring of boss on the inside and outside of the lower anti-theft ring, with a diameter of about 2. The 18 thin connecting bridges of mm are connected to the bottle cap 7, and the bottle cap breaks once the bottle cap is opened. Plastic anti-theft bottle caps Typical injection mold structure Plastic bottle anti-theft caps were first produced by injection molding. After years of development, it has now formed a special injection molding machine for bottle caps and a supporting conveying and testing unit. Most of the molds are in the form of a hot runner system and a mold with multiple cavities. 32 cavities, 48 cavities, 64 cavities, and 72 cavities are the mainstream mold molds in foreign countries. Bottle caps are thin-walled injection molding. Although the volume is not large, the structure is relatively complicated. With the structure of thread and anti-theft ring, and the thin connection bridge between the bottle cap body and the anti-theft ring, the demolding becomes the main difficulty in the injection molding of the bottle cap. At present, there are mainly three mold forms to solve this problem. One is that the anti-theft ring part is in the form of a Huff block. In the mold opening stage, the Huff block of the anti-theft ring part is first opened, then the threaded part is forced out, and finally the entire lid is ejected by the inner top cover. The structure of this kind of mold is relatively simple. Generally, only two demouldings are needed, but the lateral volume of the mold is large, and the number of cavities is limited. The mold with the same number of cavities is heavy, and the specifications of the injection molding machine are correspondingly increased. The second method is to force the thread directly without processing the connecting bridge during injection molding, and then add a ring cutting process after injection molding. The production cost of this mold is relatively high. An additional ring cutting machine is required, and the production cost increases. However, the mold structure is simple, the mold processing cost is low, and the mold life is long. The third is to use a three-time demoulding mechanism and one-time molding. This mold structure is relatively complicated, and the relative movement between the mold forming parts during the injection process is relatively large. Therefore, the accuracy of the mold manufacturing and the strength and wear resistance of the mold material, etc. Have higher requirements, such as the accuracy of the relative motion between the parts are H7 / above. When the plastic is injected into the cavity and fully cooled, first the cavity fixing plate is separated from the anti-theft ring fixing plate, that is, the moving and fixed molds are separated; second, the anti-theft ring is pushed together with the middle threaded core, medium core and ejector core. The forward movement, separated from the bushing, disengages the plastic product from the bushing to achieve the first demoulding; then, the threaded core and the medium core stop moving, and the anti-theft ring core and the ejector core move forward together, That is, the middle center ejector is ejected, and the outer anti-theft ring core is pushed out to forcely pull out the internal thread and the inner convex ring of the anti-theft ring to achieve the second demolding
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