In-mold transfer printing injection mold integrating preheating, frame pressing and vacuum

Abstract

The utility model discloses an in-mold transfer printing injection mold integrating preheating, frame pressing and vacuum in the field of molds, which comprises a male mold core, a female mold core and a roll film, the male mold core and the female mold core are matched to form a cavity, a transfer printing pattern is preset on the roll film, and the in-mold transfer printing injection mold further comprises a frame pressing device, a gas circuit, a heating device and a feeding device; one end of the air channel is connected with the cavity, and the other end of the air channel is connected with an air extractor; the feeding device is used for conveying a roll film into a cavity, the heating device is used for heating the roll film, and the frame pressing device is used for pressing the roll film into the cavity. According to the utility model, the heating device is arranged on the feeding device, so that the roll film is preheated, a transfer pattern is more firmly transferred on a product, the roll film can be tightly pressed on a cavity insert by the pressing frame device, the space between the roll film and the cavity insert is in a vacuum state by matching with a gas circuit, and the roll film and the cavity insert are completely clung to each other; bad products caused by film loosening are avoided, and the product percent of pass is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold field especially relates to a kind of in-mold transfer injection mold of preheating, frame, vacuum in an organic whole. BACKGROUND

[0002] In-mold transfer injection product is widely used in daily life. It is a kind of pattern printed on film carrier in advance and the printed film is made into roll shape and installed above the mold. The transfer decoration on the surface of plastic product is realized by controlling mold temperature and injection pressure, speed, etc. The produced plastic product has the pattern printed on the film in advance. This transfer injection can reduce the process and cost of re-printing after injection molding, and the product has high-quality and beautiful appearance pattern and is widely used in daily life. The most common problem in this process injection production is that the film is not balanced in the mold cavity due to gas in the mold cavity or due to the asymmetric shape of the cavity or due to the uneven injection pressure caused by the glue feeding position. The film is not balanced in the mold cavity, which causes the film to stretch and wrinkle or not to fit the cavity surface, which directly affects the pattern effect of the surface transfer of the molded plastic product. Therefore, how to improve the flatness of the film in the mold cavity during mold closing is very important, which directly affects the yield and production efficiency of the molded product, and is very important to reduce product cost and improve product market competitiveness. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a kind of in-mold transfer injection mold of preheating, frame, vacuum in an organic whole, with preheating, compression and vacuum function, improve the qualified rate of product forming.

[0004] To solve the above technical problems, the following technical solutions are adopted:

[0005] The utility model provides a kind of in-mold transfer injection mold of preheating, frame, vacuum in an organic whole, including male die, female die and roll film, the male die and female die cooperate to form cavity, the roll film is pre-set with transfer pattern, further including frame device, gas circuit, heating device and feeding device;The gas circuit is arranged in the female die, one end is connected with the cavity, and the other end is connected with suction device;The feeding device is used to deliver roll film into the cavity, the heating device is used to heat the roll film, and is arranged on the feeding device, the frame device is used to compress the roll film in the cavity.

[0006] Optionally, the pressing frame device comprises a pressing frame bottom plate, a pressing frame, a connecting rod and a spring, the pressing frame bottom plate is installed between the rear mold plate and the rear mold fixed plate, a plurality of connecting rods are arranged on the pressing frame bottom plate, the spring is sleeved on the connecting rod, the other end of the connecting rod penetrates through the rear mold plate and is connected with the pressing frame, the spring is located between the rear mold plate and the rear mold fixed plate, and a top rod for ejecting the pressing frame device is further arranged at the bottom of the pressing frame bottom plate. The pressing frame is a frame structure and is located at the outer periphery of the female mold core.

[0007] Optionally, the rear mold fixed plate is provided with a top rod and a guide rod, one end of the top rod is connected with the pressing frame bottom plate, the other end penetrates through the rear mold fixed plate and is connected with the power device, the top rod is used for driving the movement of the pressing frame device, four top corners of the rear mold fixed plate are provided with guide rod holes, the pressing frame bottom plate is provided with a guide sleeve hole penetrating up and down at a position corresponding to the guide rod hole of the rear mold fixed plate, one end of the guide rod is arranged in the guide rod hole, the other end penetrates through the guide sleeve hole and is connected with the rear mold plate, and the guide rod and the guide sleeve hole are matched to guide the pressing frame device when the pressing frame device is driven by the top rod.

[0008] Optionally, the female mold core is installed in the groove of the rear mold plate, the bottom of the rear mold plate is connected with the rear mold fixed plate, the gas path penetrates through the female mold core after being opened from the side wall of the cavity, extends to the rear mold plate, and finally forms a gas port on the outer side wall of the rear mold plate, and the gas port is connected with the air extraction device.

[0009] Optionally, the upper and lower surfaces of the female mold core are provided with rubber rings, and the rubber rings are used for sealing the gas path.

[0010] Optionally, the feeding device comprises a feeding support and a feeding ring disc, the feeding ring disc is used for installing the film roll, the feeding ring disc comprises two rotating discs and a connecting rod connected between the two rotating discs, the film roll is sleeved on the connecting rod, the rotating discs are installed on the two sides of the feeding support, and the heating device is further installed on the feeding support.

[0011] Optionally, the heating device comprises a heating plate, a cylindrical heater, a thermocouple and a temperature control junction box, the heating plate is connected with the temperature control junction box through a plurality of cylindrical heaters and a plurality of thermocouples, the surface of the heating plate is provided with a heat insulation plate, and the film roll is located between the heating plate and the heat insulation plate.

[0012] Optionally, the male mold core is installed on the front mold plate, the front mold plate is connected with the front mold fixed plate, a thimble bottom block and a thimble face plate are further arranged between the front mold plate and the front mold fixed plate, the thimble face plate is located below the thimble bottom block, an adhesive inlet path is arranged in the male mold core, the fused adhesive is injected into the cavity through the adhesive inlet path to form a product, and the product is completed by using the pressure and temperature in the process of adhering the fused adhesive to the film roll to complete the preset transfer pattern.

[0013] Compared with the prior art, the utility model discloses the beneficial effects reached have

[0014] The utility model discloses a heating device is installed on the feeding device, realizes the preheating of roll -up film, makes the roll -up film that sends into the mould cavity has initial temperature, and the pattern that transfers up is more firm, sets up the air path and the pressure frame device on the master mould core, and the pressure frame device can be pressed tightly on the master mould core with roll -up film, and the vacuum state between roll -up film and master mould core is made with the air path cooperation, and the air path is connected with the air extraction device, realizes that roll -up film and master mould core realize completely close -up, avoid roll -up film loose and produce the inferior product, improve product pass rate. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is one of the whole section structure schematic diagram of the in-mold transfer injection mold provided by the utility model,

[0016] Figure 2 It is the whole section structure schematic diagram of the in-mold transfer injection mold provided by the utility model,

[0017] Figure 3 It is one of the local structure schematic diagram of the in-mold transfer injection mold provided by the utility model,

[0018] Figure 4 It is the local structure schematic diagram of the in-mold transfer injection mold provided by the utility model,

[0019] Figure 5 It is one of the local section structure schematic diagram of the in-mold transfer injection mold provided by the utility model,

[0020] Figure 6 It is the local section structure schematic diagram of the in-mold transfer injection mold provided by the utility model,

[0021] Figure 7 It is the local split structure schematic diagram of the in-mold transfer injection mold provided by the utility model,

[0022] Figure 8 It is the local section enlarged structure schematic diagram of the in-mold transfer injection mold provided by the utility model,

[0023] Figure 9 It is the side view structure schematic diagram of the in-mold transfer injection mold provided by the utility model.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1, front mold fixed plate; 2, ejector pin bottom block; 3, ejector pin face plate; 4, front mold plate; 5, rear mold plate; 6, press frame bottom plate; 7, rear mold fixed plate; 8, male mold core; 9, female mold core; 10, press frame; 11, connecting rod; 12, spring; 13, air path; 14, rubber ring; 15, exhaust port; 16, film winding; 17, top rod; 18, guide sleeve hole; 19, guide rod; 20, transfer pattern; 21, barrel heater; 22, thermocouple; 23, temperature control terminal box; 24, feeding ring disc; 25, feeding support; 26, heating plate; 27, heat insulation plate. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use.

[0027] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more. In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Example 1

[0028] This embodiment provides an in-mold transfer injection mold that integrates preheating, frame pressing, and vacuuming. It includes a male mold core 8 and a female mold core 9, which cooperate to form a cavity. The male mold core 8 is provided with a glue injection path, and the roll film 16 is provided with a preset transfer pattern 20. The molten glue is injected into the cavity through the glue injection path to form a product. During the bonding process between the molten glue and the roll film 16, the preset transfer pattern 20 is completed on the product by injection pressure and temperature.

[0029] It also includes a frame pressing device, an air passage 13, a heating device, and a feeding device. The air passage 13 is located inside the female mold core 9, with one end connected to the cavity and the other end connected to the air extraction device. The feeding device is used to transport the roll film 16 into the cavity. The heating device is used to heat the roll film 16 and is located on the feeding device. The frame pressing device is used to press the roll film 16 tightly into the cavity.

[0030] The feeding device conveys the roll film 16 into the cavity. The lower surface of the roll film 16 contacts the female mold core 9, and the upper surface contacts the male mold core 8. The pressing device presses the edge of the roll film 16 tightly onto the edge of the female mold core 9. Then, the air extraction device removes all the air between the female mold core 9 and the roll film 16 through the air passage 13, so that the roll film 16 adheres tightly to the surface of the female mold core 9. After the male mold core 8 is pressed down onto the upper surface of the roll film 16, the transfer of the pattern on the roll film 16 is completed.

[0031] The pressure frame device ensures that the roll film 16 is stably fixed on the mold, preventing film displacement during injection. Combined with the air passage 13, it completely extracts gas from the lower surface of the roll film 16, fully expelling gas from the cavity. This reduces defects such as wrinkles, curling edges, uneven cavity surface adhesion, and air bubbles caused by pressure imbalance within the cavity during injection molding, thereby improving the product yield.

[0032] The heating device installed on the feeding device can preheat the roll film 16 in advance. The roll film 16 entering the mold cavity has a certain temperature, and the adhesion of the transfer pattern 20 transferred on the product is stronger, which can improve the transfer effect and durability of the transfer pattern 20. Example 2

[0033] This embodiment provides an in-mold transfer injection mold that integrates preheating, frame pressing, and vacuuming, based on Embodiment 1, with the following differences:

[0034] like Figure 1 , Figure 4 , Figure 7As shown, the pressing frame device includes a pressing frame bottom plate 6, a pressing frame 10, a connecting rod 11 and a spring 12, the pressing frame bottom plate 6 is connected with the pressing frame 10 through four connecting rods 11, the spring 12 is sleeved on the connecting rod 11, the pressing frame bottom plate 6 is arranged between the rear mold plate 5 and the rear mold fixed plate 7, the spring 12 is also located between the rear mold plate 5 and the rear mold fixed plate 7, a top rod 17 is arranged at the bottom of the pressing frame 10, the top rod 17 pushes the pressing frame bottom plate 6 upward, the pressing frame 10 and the pressing frame bottom plate 6 move upward together, the pressing frame 10 is separated from the edge of the female mold core 9, the film 16 enters between the pressing frame 10 and the female mold core 9, then the force of the top rod 17 is cancelled, the pressing frame bottom plate 6 moves downward due to the action of the spring 12, the pressing frame 10 moves downward, the edge of the film 16 is pressed on the female mold core 9. The female mold core 9 is installed in the groove of the rear mold plate 5, and the upper surface is matched with the male mold core 8.

[0035] As shown in Figure 2 , Figure 5 , Figure 6 , the rear mold fixed plate 7 is further provided with a guide device for the movement of the pressing frame device, the guide device includes a guide rod 19 and a guide sleeve hole 18, four top corners of the rear mold fixed plate 7 are provided with guide rod holes, the pressing frame bottom plate 6 is provided with an up-and-down-through guide sleeve hole 18 at a position corresponding to the guide rod hole on the rear mold fixed plate 7, one end of the guide rod 19 is arranged in the guide rod hole, and the other end passes through the guide sleeve hole 18 and is connected with the rear mold plate 5, when the top rod 17 drives the pressing frame device to move up and down, the guide rod 19 and the guide sleeve hole 18 cooperate to guide, avoiding the deflection of the movement of the pressing frame device.

[0036] As shown in Figure 2 , Figure 8 , the air path 13 extends to the rear mold plate 5 after penetrating through the female mold core 9 from the opening of the cavity side wall, and finally forms an air port on the outer side wall of the rear mold plate 5, the air port is connected with the air extraction device, the upper and lower surfaces of the female mold core 9 are both provided with rubber rings 14, the rubber rings 14 are located outside the exhaust port 15, and are used for sealing the air path 13.

[0037] As shown in Figure 3 , Figure 4 , Figure 5 , the feeding device includes a feeding support 25 and a feeding ring disc 24, the feeding support 25 is a long strip plate structure arranged in parallel, the two long strip plates are connected through the feeding ring disc 24, the feeding ring disc 24 includes two rotating discs and a connecting rod connecting the two rotating discs, the two rotating discs are respectively installed at the ends of the two long strip plates, and the centers of the rotating discs are connected through the connecting rod, the film 16 is sleeved on the connecting rod, and the film 16 is conveyed into the cavity by driving the connecting rod to rotate. The other end of the feeding support 25 is installed on the side edge of the rear mold plate 5.

[0038] As shown in Figure 7 , Figure 9As shown, the heating device comprises a heating plate 26, a heat insulation plate 27, a barrel heater 21, a thermocouple 22 and a temperature control terminal box 23. The heating plate 26 is installed between two long plates. The heating plate 26 is connected with the temperature control terminal box 23 through the barrel heater 21 and the thermocouple 22. The upper and lower surfaces of the heating plate 26 are both provided with the heat insulation plate 27. The film 16 is arranged in the cavity through the heating plate 26 and the heat insulation plate 27. The film 16 entering the cavity is heated to a certain temperature by the heating plate 26, so that the transfer pattern 20 printed on the film 16 is clearer and more firm. The temperature control terminal box 23 is connected with a display device, so as to monitor the heating temperature and state in real time. Different ink adding temperatures are set for different transfer patterns 20.

[0039] As shown in Figure 1 , Figure 2 , the male die stem 8 is installed on the front die plate 4, the front die plate 4 is installed on the front die fixed plate 1, and the front die plate 4 and the front die fixed plate 1 are further provided with the ejector pin bottom block 2 and the ejector pin face plate 3. The ejector pin face plate 3 is connected with the ejector pin, which is used for ejecting the formed product. The male die stem 8 is further provided with a glue inlet path. The glue is injected into the cavity through the glue inlet path to form the product.

[0040] In use, the male die stem 8 and the female die stem 9 are opened, the pressing frame 10 is upwardly ejected by a distance, the feeding device delivers the heated film 16 to the female die stem 9, then the pressing frame 10 restores to the original state, the film 16 is pressed on the female die stem 9, the air suction device is started, the air between the film 16 and the female die stem 9 is exhausted, the film 16 is tightly attached to the female die stem 9, the male die stem 8 is driven to cooperate with the female die stem 9, and the transfer injection molding is started.

[0041] The above only describes the preferred embodiments of the present application. It should be noted that those skilled in the art can make some improvements and modifications without departing from the technical principles of the present application. These improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. An in-mold transfer injection mold integrating preheating, frame pressing and vacuum, comprising a male mold core, a female mold core and a film, the male mold core and the female mold core cooperate to form a cavity, and the film is provided with a transfer pattern in advance, characterized in that, Also include the pressure frame device, air path, heating device and feeding device; The air path is arranged in the mother die, one end is connected with the cavity, the other end is connected with the air extraction device; The feeding device is used for conveying the film to the cavity, the heating device is used for heating the film, and the heating device is arranged on the feeding device, and the pressure frame device is used for pressing the film in the cavity.

2. The in-mold transfer injection mold integrated with preheating, frame pressing, and vacuum according to claim 1, wherein, The pressure frame device includes a pressure frame bottom plate, a pressure frame, a connecting rod and a spring, the pressure frame bottom plate is installed between the back mold plate and the back mold fixed plate, a plurality of connecting rods are arranged on the pressure frame bottom plate, the spring is sleeved on the connecting rod, the other end of the connecting rod penetrates through the back mold plate and is connected with the pressure frame, the spring is located between the back mold plate and the back mold fixed plate, and the bottom of the pressure frame bottom plate is also provided with a ejector pin for ejecting the pressure frame device, the pressure frame is a frame structure and is located at the outer periphery of the mother die.

3. The in-mold transfer injection mold integrated with preheating, frame pressing, and vacuum according to claim 2, wherein, The back mold fixed plate is provided with an ejector pin and a guide rod, one end of the ejector pin is connected with the pressure frame bottom plate, the other end penetrates through the back mold fixed plate and is connected with the power device, the ejector pin is used to drive the movement of the pressure frame device, four top corners of the back mold fixed plate are provided with guide rod holes, the corresponding positions of the pressure frame bottom plate and the guide rod holes on the back mold fixed plate are provided with guide sleeve holes penetrating up and down, one end of the guide rod is arranged in the guide rod hole, the other end penetrates through the guide sleeve hole and is connected with the back mold plate, and the guide rod and the guide sleeve hole cooperate to guide the pressure frame device when it is driven by the ejector pin.

4. The in-mold transfer injection mold integrated with preheating, frame pressing, and vacuum according to claim 1, wherein, The mother die is installed in the groove of the back mold plate, the bottom of the back mold plate is connected with the back mold fixed plate, the air path penetrates through the mother die after opening from the cavity side wall, extends to the back mold plate, and finally forms an air port on the outside wall of the back mold plate, the air port is connected with the air extraction device.

5. The in-mold transfer injection mold integrated with preheating, frame pressing, and vacuum according to claim 1, wherein, The upper and lower surfaces of the mother die are provided with rubber rings, and the rubber rings are used to seal the air path.

6. The in-mold transfer injection mold integrated with preheating, frame pressing, and vacuum according to claim 1, wherein, The feeding device includes a feeding support and a feeding ring disc, the feeding ring disc is used to install the film, the feeding ring disc includes two rotating discs and a connecting rod connected between the two rotating discs, the film is sleeved on the connecting rod, the rotating discs are installed on both sides of the feeding support, and the heating device is also installed on the feeding support.

7. The in-mold transfer injection mold integrated with preheating, frame pressing, and vacuum according to claim 1, wherein, The heating device includes a heating plate, a cylindrical heater, a thermocouple and a temperature control terminal box, the heating plate is connected with the temperature control terminal box through a plurality of cylindrical heaters and a plurality of thermocouples, the surface of the heating plate is provided with a heat insulation plate, and the film is located between the heating plate and the heat insulation plate.

8. The in-mold transfer injection mold integrated with preheating, frame pressing, and vacuum according to claim 1, wherein, The male die is installed on the front mold plate, the front mold plate is connected with the front mold fixed plate, the front mold plate and the front mold fixed plate are also provided with a ejector pin bottom block and an ejector pin face plate, the ejector pin face plate is located below the ejector pin bottom block, the male die is provided with a glue inlet path, the molten glue is injected into the cavity through the glue inlet path to form a product, and the product is completed by using the pressure and temperature in the process of combining the molten glue with the film.

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