Plastic injection tool for producing a closure cap, and method for producing a closure cap

A plastic injection tool (1) for producing a closure cap (5) with a cap body (14) and a cap cover (15) formed integrally with and of the same material as the cap body (14), wherein the injection tool (1) is divided into first and second mold halves (2, 3), which are configured to be displaced relative to one another, and wherein an injection nozzle (4) is formed in the first mold half (2), wherein sliding jaw tool parts (9), which are configured to simultaneously be moved in an ejection direction (r) of the produced closure cap (5) and perpendicular to the ejection direction (r), are further formed in the second mold half (3) radially outside to a central tool core (8), and a partial injection contour (16) of the cap body (14) is in each case formed in the sliding jaw tool parts (9), wherein the partial injection contours (16), combined in a circumferential direction of the closure cap (5) result in a complete injection contour of the part of the cap body (14), which is formed by the sliding jaw tool parts (9), wherein an ejector (48) is further provided to the second mold half (3), for ejecting the produced closure cap (5), wherein two or more of the sliding jaw tool parts (9) have partial injection contours (16) that differ from one another, wherein one of the sliding jaw tool parts (9) is in contact with the tool core (8) in the ejection direction (r) prior to the ejection of the closure cap (5) on two continuous contact regions (51) located one behind the other in the ejection direction (r), wherein the second mold half (3) has a ring part (10), having an approximately square outline, in which the sliding jaw tool parts (9) are received so as to be movable on an inner side, wherein the ring part (10) is movably fastened to a tool receiving part (13) in a plane perpendicular to the ejection direction (r), wherein a holding element (23) for the ring part (10) is provided, which is fastened to the tool receiving part (13) by interconnecting a sleeve (28), and wherein a passage bore (22) of the ring part (10), through which the holding element (23) extends with the sleeve (28), leaves a free space (31) to the sleeve (28).

A method for producing a closure cap (5) in a plastic injection tool (1), wherein the closure cap (5) has a cap body (14) and a cap cover (15) formed integrally with and of the same material as the cap body (14), wherein the injection tool (1) is divided into first and second mold halves (2, 3), which can be displaced relative to one another, and wherein an injection nozzle (4) is formed in the first mold half (2) and sliding jaw tool parts (9) are formed in the second mold half (3), wherein at least two of the sliding jaw tool parts (9) are formed identically or at least approximately identically with respect to a partial injection contour, while at least one of the sliding jaw tool parts (9) has a partial injection contour, which differs from a partial injection contour of further sliding jaw tool parts (9), wherein the sliding jaw tool parts (9) extend in an axial direction over more than half of a height of the cap body (14) and wherein the sliding jaw tool parts (9) are wedge-shaped in cross-section, widening in a longitudinal direction toward the first mold half (2), wherein the method comprises in a first step forming the cap body (14) in the injection tool (1) in a same injection process with a design, which differs over the circumference, in the sliding jaw tool parts (9), and the cap cover (15) is formed in the first mold half (2), and in the same step, one of the sliding jaw tool parts (9) is brought into contact with the tool core (8) in the ejection direction (r) prior to the ejection of the closure cap (5) on two regions (51) located one behind the other and spaced apart from one another in the ejection direction (r), which appear jointly in a cross section through the second mold half, in which cross section a cap longitudinal axis runs linearly.