Contact lens forming mold

Abstract

The utility model discloses a contact lens forming die which comprises a male die and a female die, one end of the male die close to the female die is provided with an integrated convex surface, one side of the female die close to the male die is provided with a concave surface, a forming cavity is formed between the convex surface and the concave surface, and an integrated cylindrical part is arranged between the convex surface and the male die. An excess material cavity corresponding to the barrel-shaped part in position is formed in the female die, the cutting section of the excess material cavity along the axis of the male die is in an L shape, and a slope part is arranged at the position, close to the barrel-shaped part, of the outer surface of the male die. According to the contact lens pressing die, the male die, the female die, the cylindrical part and the excess material cavity are arranged, in the process that the male die is inserted into the female die to conduct pressing die forming on contact lenses, excess materials are extruded to flow out of the forming cavity and enter the excess material cavity, the cylindrical part cuts off the excess materials through the opening of the excess material cavity, and when forming is completed, the cylindrical part descends to block the opening of the excess material cavity; the forming cavity is separated from the excess material cavity, so that the excess material is prevented from being adhered to the edge of the contact lens.

Description

Technical Field

[0001] The utility model relates to the technical field of contact lens processing, in particular to a contact lens forming mould. Background Art

[0002] Contact lenses, also called contact lenses or contact glasses, refer to lenses worn on the cornea of ​​the eyeball to correct vision or protect the eyes. According to the hardness of the material, they include hard, semi-hard, and soft. Contact lenses not only bring great improvements to patients with refractive errors such as myopia, hyperopia, and astigmatism in terms of appearance and convenience. They also have a wide field of vision and realistic vision. In addition, they also play a special role in controlling the development of myopia and astigmatism in adolescents and treating special eye diseases.

[0003] In the prior art, a Chinese patent with publication number CN217891702U discloses a contact lens mold, in which a concave-convex structure for increasing the contact area is provided in the residual material cavity. When the contact lens material is taken out after solidification, the residual material and the contact lens are prevented from being taken out together in the case of adhesion. However, the residual material of the contact lens is generally small, and the setting of the concave-convex structure will prevent the residual material from flowing into the residual material cavity, which may easily cause the residual material to adhere to the edge of the contact lens. Utility Model Content

[0004] The utility model aims to provide a contact lens forming mold to solve the problem in the prior art that the arrangement of the concave-convex structure will block the residual material from flowing into the residual material cavity, which easily causes the residual material to adhere to the edge of the contact lens.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a contact lens molding mold, comprising a male mold and a female mold, wherein the male mold is provided with an integral convex surface at one end close to the female mold, and the female mold is provided with a concave surface at one side close to the male mold, a molding cavity is formed between the convex surfaces and the concave surfaces, an integral cylindrical portion is provided between the convex surface and the male mold, and a residual material cavity corresponding to the position of the cylindrical portion is provided inside the female mold.

[0006] Preferably, the cross-section of the residual material cavity along the axis of the punch is L-shaped.

[0007] Preferably, an inclined portion is provided on the outer surface of the male mold near the cylindrical portion.

[0008] Preferably, the inner wall of the die fits the cylindrical portion and the inclined portion.

[0009] Preferably, an end of the female mold close to the male mold is fixedly connected with an integral first ring disk, and an outer surface of the male mold is fixedly sleeved with a second ring disk located on the upper surface of the first ring disk.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model is provided with a convex mold, a concave mold, a cylindrical part and a residual material cavity. During the process of compression molding the contact lens by inserting the convex mold into the concave mold, the residual material flows out of the molding cavity into the residual material cavity through extrusion, and the cylindrical part cuts off the residual material through the opening of the residual material cavity. When the molding is completed, the cylindrical part descends to block the opening of the residual material cavity, so that the molding cavity and the residual material cavity are separated, thereby avoiding the adhesion of the residual material to the edge of the contact lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0013] Figure 1 This is a schematic diagram of the appearance structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0015] Figure 3 It is a schematic diagram of the split structure of the utility model.

[0016] In the figure: 1, punch; 2, die; 3, convex surface; 4, concave surface; 5, forming cavity; 6, cylindrical portion; 7, residual material cavity; 8, inclined portion; 9, first ring disk; 10, second ring disk. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-3 In an embodiment of the utility model, a contact lens molding mold comprises a male mold 1 and a female mold 2. The male mold 1 is inserted into the female mold 2 for mold closing, so as to extrude and mold the liquid lens monomer inside the female mold 2. An integral convex surface 3 is provided at one end of the male mold 1 close to the female mold 2, and a concave surface 4 is provided at one side of the female mold 2 close to the male mold 1. The convex surface 3 and the concave surface 4 are arranged to press-mold the contact lens so that the contact lens is molded in the inner core of the molding cavity 5. The convex surface 3 and the concave surface 4 are arranged to form the shape of the contact lens, and a molding cavity 5 is formed between the convex surface 3 and the concave surface 4.

[0019] See also Figure 1-3An integral cylindrical portion 6 is provided between the convex surface 3 and the male mold 1, and a residual material cavity 7 corresponding to the position of the cylindrical portion 6 is opened inside the female mold 2. During the mold closing process of the male mold 1 and the female mold 2, the residual material flows out of the molding cavity 5 into the residual material cavity 7 through extrusion. When the mold closing is completed, the cylindrical portion 6 descends to block the opening of the residual material cavity 7, so that the molding cavity 5 is separated from the residual material cavity 7, and the cylindrical portion 6 cuts off the residual material through the opening of the residual material cavity 7 to prevent the residual material from sticking to the edge of the contact lens.

[0020] See also Figure 1-3 The cross section of the residual material cavity 7 along the axis of the punch 1 is L-shaped. The L-shaped setting of the residual material cavity 7 increases the volume of the residual material cavity 7, so that more residual material can be contained.

[0021] See also Figure 1-3 An inclined portion 8 is provided on the outer surface of the punch 1 near the cylindrical portion 6. The inclined portion 8 enables the punch 1 to be inserted along the inclined surface when inserted into the die 2, so that the insertion of the punch 1 is smoother.

[0022] See also Figure 1-3 In order to achieve the engagement of the above-mentioned cylindrical portion 6 and the inclined portion 8, the inner wall of the die 2 is matched with the cylindrical portion 6 and the inclined portion 8, and the matching setting can achieve the engagement.

[0023] See also Figure 1-3 An integral first disk 9 is fixedly connected to one end of the die 2 close to the punch 1, and a second disk 10 located on the upper surface of the first disk 9 is fixedly sleeved on the outer surface of the punch 1. The fit of the second disk 10 and the first disk 9 indicates that the punch 1 and the die 2 are in place.

[0024] The working principle and use process of the utility model are as follows: when in use, liquid lens monomer is dripped into the interior of the female mold 2, and then the male mold 1 is inserted into the female mold 2 to achieve mold closing. The arrangement of the convex surface 3 and the concave surface 4 is used to press the contact lens so that the contact lens is molded in the inner core of the molding cavity 5. During the process, the excess material flows out of the molding cavity 5 into the excess material cavity 7 through extrusion. When the mold closing is completed, the cylindrical portion 6 descends to block the opening of the excess material cavity 7, so that the molding cavity 5 is separated from the excess material cavity 7, and the cylindrical portion 6 cuts off the excess material through the opening of the excess material cavity 7 to avoid the excess material from adhering to the edge of the contact lens. The L-shaped arrangement of the excess material cavity 7 increases the volume of the excess material cavity 7 so that more excess material can be contained. The fit of the second ring plate 10 with the first ring plate 9 indicates that the mold closing of the male mold 1 and the female mold 2 is in place.

[0025] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A contact lens molding mold, comprising a male mold (1) and a female mold (2), characterized in that: The end of the male mold (1) close to the female mold (2) is provided with an integral convex surface (3), the side of the female mold (2) close to the male mold (1) is provided with a concave surface (4), a molding cavity (5) is formed between the convex surface (3) and the concave surface (4), an integral cylindrical portion (6) is provided between the convex surface (3) and the male mold (1), and a residual material cavity (7) corresponding to the position of the cylindrical portion (6) is provided inside the female mold (2).

2. A contact lens forming mold according to claim 1, characterized in that: The cross section of the residual material cavity (7) along the axis of the punch (1) is L-shaped.

3. A contact lens forming mold according to claim 1, characterized in that: The outer surface of the male mold (1) is provided with an inclined portion (8) at a position close to the cylindrical portion (6).

4. A contact lens forming mold according to claim 3, characterized in that: The inner wall of the concave mold (2) fits with the cylindrical portion (6) and the inclined portion (8).

5. A contact lens forming mold according to claim 1, characterized in that: An end of the female mold (2) close to the male mold (1) is fixedly connected to an integral first ring disk (9), and an outer surface of the male mold (1) is fixedly sleeved with a second ring disk (10) located on the upper surface of the first ring disk (9).

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