CN101574843B - Plastic shell seamless wrapping process and special high-pressure forming mold core thereof - Google Patents
Plastic shell seamless wrapping process and special high-pressure forming mold core thereof Download PDFInfo
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- CN101574843B CN101574843B CN2008102181237A CN200810218123A CN101574843B CN 101574843 B CN101574843 B CN 101574843B CN 2008102181237 A CN2008102181237 A CN 2008102181237A CN 200810218123 A CN200810218123 A CN 200810218123A CN 101574843 B CN101574843 B CN 101574843B
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Abstract
The invention relates to a plastic shell seamless wrapping process and a special high-pressure forming mold core thereof, and belongs to the technical field of plastic processing. The process comprises the following steps: performing printing; using the special mold core for high-pressure forming, and making a plastic sheet become a three-dimensional shell; using a punching mold to punch the three-dimensional shell along the upper end of a bended position of the three-dimensional shell or the upper end of an internally bended position of the three-dimensional shell, and cutting off a scrap area; and finally using a common process to perform injection molding on the punched three-dimensional shell through dried plastic particles, and finally performing forming. The mold core has the shape of a rectangle, and internally concave cambered grooves are arranged on the lower parts of two side faces of the mold core along the horizontal position. The invention greatly increases the coverage area of the plastic sheet of the plastic shell and the plastic sheet can cover the lower part of the fractal surface of the mold for injection molding and even can cover a flip area which cannot be covered before, so that the plastic shell completely has no phenomenon of edge leakage, consequently the finished product can be more beautiful.
Description
Technical field:
The present invention relates to a kind of plastic shell seamless wrapping process and special high-pressure forming mold core thereof, it belongs to technical field of plastic.
Background technology:
IMD puts into injection mould with the decoration sheet that has printed, then with the back side of resin injection at decoration sheet, decoration sheet and resin-bonded are become one, all can carry out decorating printing, make product reach ornamental and functional effect the moulding product of three-dimensional shape.Existing IMD product characteristics is: the protection of the hardening film by specially treated, and product has good surface abrasion resistance and chemically-resistant characteristic; The design of 3D complicated shape: the extensibility that applied film is good, can reach required product complexity appearance design demand smoothly; Variation style: can create metal according to customer demand and electroplate or the natural material special patterns; Make simplification: via the technology of single injection-molded, moulding is reached simultaneously with decoration, and stable production can be provided.But the decoration sheet on the plastic casing that traditional IMD (Film-in mold decoration) produces can only cover injecting products die joint or more than, because the existence of tolerance, this has just determined the covering of sheet material in this zone impossible 100%, contraposition is to the limit, bottom surface of product, so narrow limit that can exist the plies less than tolerance 0.3mm not cover, can see the former injected plastics material that should cover by this edge, cause the bad of outward appearance, and the stability of producing also is subjected to bigger restriction.
Summary of the invention:
The object of the present invention is to provide a kind of covering fully that realizes plastic shell, appearance is attractive in appearance, the plastic shell seamless wrapping process of stable processing technique and special high-pressure forming mold core thereof.
The object of the present invention is achieved like this:
A kind of plastic shell seamless wrapping process is characterized in that it comprises following technological process:
A: printing:
The plastic sheet of needs being made plastic shell will cut into suitable size according to the size of final products; With the plastic sheet that cuts under 75～120 ℃ temperature preliminary drying to remove the moisture in the sheet material; According to design, to make silk screen and carry out chromaticity printing, printing road number is 1～20 road, and carries out the baking of IR infrared ray after the per pass printing, baking temperature is 60～120 ℃; After all color printing is finished, the plastic sheet that has printed is put into the baking box baking, stoving time is 2～4 hours, temperature is 75～130 ℃;
B: high-pressure molding:
To finish printing, and the baking dry ink plastic sheet use four the corner upper punch locating holes of common perforating press at plastic sheet, do reliable location during for the plastic sheet moulding; Using high-pressure forming machine to cooperate mould bases and the formation die core that has the back-off shape is three-dimensional housing with plastic sheet by two-dimentional cut-parts compression moulding, the process conditions of high-pressure molding: the patrix temperature is 35 ℃～170 ℃, counterdie temperature: 90 ℃～130 ℃, IR infrared ray baking temperature: 250 ℃～350 ℃, low pressure is 5～15bar, high-pressure is 20～60bar, and the cycle is 45～120s;
C: die-cut:
Use die cutting die to cut the waste material zone along the bending part upper end of three-dimensional housing or the upper end, knee of indent bending;
D: use common process to carry out injection moulding for finishing die-cut three-dimensional housing with dry particles, last moulding.
In clicking technique, described three-dimensional housing is a cuboid, side vertical plane and when having an indent arcuate shape, the peak that the die-cut position of its die cutting die is positioned at the circular arc of choosing the indent arc is the edge of a knife position of lateral punching, tolerance value can be chosen 0～1mm.
In clicking technique, described three-dimensional housing is a semicylinder, and when the bottom arc transition connect the vertical side shape, its lateral punching edge of a knife position was excessive fillet place, and tolerance can be chosen 0～1mm.
In clicking technique, when described three-dimensional housing was the back-off shape of deflection angle in cuboid and bottom, side have obviously, the die-cut edge of a knife of its direction finding position turning point was for this reason extended 0.3～3mm, the optional 0～1mm of tolerance downwards.
A kind of special high-pressure forming mold core thereof of described plastic shell seamless wrapping process, described core rod is shaped as: cuboid and be provided with the indent deep-slotted chip breaker along horizontal level in the bottom of two side.
The radius of described indent deep-slotted chip breaker is determined mode: when needing bound edge to be of a size of L1, and the radius R=L1+0.3 of indent deep-slotted chip breaker～0.5mm, the degree of depth W=R of indent deep-slotted chip breaker * (1/4～1/2).
Described core rod is shaped as: the both sides, bottom of cuboid are provided with inside inclined-plane, and then connect the pure straight side of arc transition.
The angle on described inclined-plane is 0～50 °, and the pure straight height on described inclined-plane is 0.5～3mm, and the height of pure straight side is 1～3mm.
Described core rod is shaped as semicylinder, and the bottom arc transition connects vertical side.
The pure straight height that described arc transition connects vertical side is 2～4mm.
The invention enables the overlay area of the plastic sheet of plastic shell to obtain breakthrough increase, can cover below the fractal area of injection mold, even the back-off band of position that can't cover before can covering, make plastic shell not leak the phenomenon on limit fully, thereby can make final product more attractive in appearance.
Description of drawings:
Accompanying drawing 1 is the mould bases structural representation of high-pressure molding mould of the present invention
Accompanying drawing 2 is one of mold insert structure schematic diagram of high-pressure molding mould of the present invention
Accompanying drawing 3 is one of plastic sheet structural representation behind the high-pressure molding of the present invention
Accompanying drawing 4 be high-pressure molding mould of the present invention the mold insert structure schematic diagram two
Accompanying drawing 5 be behind the high-pressure molding of the present invention the plastic sheet structural representation two
Accompanying drawing 6 be high-pressure molding mould of the present invention the mold insert structure schematic diagram three
Accompanying drawing 7 be behind the high-pressure molding of the present invention the plastic sheet structural representation three
The specific embodiment:
Below in conjunction with accompanying drawing 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 the present invention is further detailed:
At first selected film of the present invention: the selection of its material is same as the prior art, can select materials such as PC, ABS, PET.PMMA usually, film thickness: 0.05～0.5mm, two light faces are arranged, and single face frosted machine glazing, two in frosted.Require film characteristics: plain edition, the anti-scratch type, its hardness can reach: HB～2H (standard weights), have chemical resistance, characteristics such as anti-UV get final product, and above-mentioned technology is all identical with prior art.
Be ready to after the film, the plastic sheet of needs being made plastic shell will cut into suitable size according to the size of final products; With the plastic sheet that cuts under 75～120 ℃ temperature preliminary drying to remove the moisture in the sheet material; In the present embodiment, the preliminary drying temperature is selected to use 75 ℃; According to design, to make silk screen and carry out chromaticity printing, printing road number is 1～20 road, if three kinds of colors promptly use three road printings, the cover color method is same as the prior art.And carry out the baking of IR infrared ray after the per pass printing, IR infrared ray baking temperature of the present invention is 60～120 ℃; In the present embodiment, the baking temperature of employing is 60 ℃.After all color printing is finished, the plastic sheet that has printed is put into the baking box baking, stoving time of the present invention is 2～4 hours, in the present embodiment, toasts 2 hours; Baking temperature of the present invention is 75～130 ℃, and baking temperature is 75 ℃ in the present embodiment.
To finish printing, and the baking dry ink plastic sheet use four the corner upper punch locating holes of common perforating press at plastic sheet, do reliable location during for the plastic sheet moulding; Using high-pressure forming machine to cooperate mould bases and the formation die core that has the back-off shape is three-dimensional housing with plastic sheet by two-dimentional cut-parts compression moulding; In the present embodiment, described high pressure embark on journey mould mould bases as shown in fig. 1, it comprises cope match-plate pattern 11, middle template 12 and lower bolster 13, the shape of described mould bases is identical with being formed in mould bases of the prior art.
The process conditions of high-pressure molding: the patrix temperature is 35 ℃, the counterdie temperature: 90 ℃, the IR temperature: 250 ℃, low pressure is 5bar, and high-pressure is 20bar, and the cycle is 45s;
In the present embodiment, what need processing is that side is the plastic shell of vertical plane, and therefore, the core rod that is adopted is cuboid 1 and is provided with indent deep-slotted chip breaker 111 in the bottom of two side along horizontal level.The radius of described indent deep-slotted chip breaker is determined mode: when needing bound edge to be of a size of L1, and the radius R=L1+0.3 of indent deep-slotted chip breaker～0.5mm, the degree of depth W=R of indent deep-slotted chip breaker * (1/4～1/2).Selecting the bound edge width dimensions is L1 when being 3mm, and the radius R of indent deep-slotted chip breaker is 3.3mm, and the degree of depth W of described indent deep-slotted chip breaker is 1/2 of a radius, and concrete data are 1.65mm.
C: die-cut:
Use die cutting die to cut the waste material zone along the bending part upper end of three-dimensional housing or the upper end, knee of indent bending.In the present embodiment, described three-dimensional housing is that side is the plastic shell 21 of vertical plane, be that the housing profile is a side vertical plane and when having an indent arcuate shape, the peak that the die-cut position of its die cutting die is positioned at the circular arc 22 of choosing the indent arc is the edge of a knife position of lateral punching, and tolerance value can be chosen 0～1mm.As shown in accompanying drawing 3, the arrow indication is the die-cut position of die cutting die.
D: use common process to carry out injection moulding for finishing die-cut three-dimensional housing with dry particles, last moulding.
In the present embodiment, with the plastic sheet that cuts under 120 ℃ temperature preliminary drying to remove the moisture in the sheet material; According to design, to make silk screen and carry out chromaticity printing, printing road number is 1～20 road, if 10 kinds of colors promptly use ten road printings, the cover color method is same as the prior art.And carry out the baking of IR infrared ray after the per pass printing, baking temperature is 120 ℃; After all color printing is finished, the plastic sheet that has printed is put into the baking box baking, toasted 4 hours; Baking temperature is 130 ℃.
The bound edge width dimensions that present embodiment is selected is L1 when being 2mm, and the radius R of indent deep-slotted chip breaker is 2.5mm, and the degree of depth W of described indent deep-slotted chip breaker is 1/4 of a radius, and concrete data are 0.625mm.
The process conditions of high-pressure molding: 170 ℃ of patrix temperature, the counterdie temperature: 130 ℃, the IR temperature: 350 ℃, low pressure is 15bar, and high-pressure is 60bar, and the cycle is 120s.
Other parts and the embodiment 1 of present embodiment are identical.
In the present embodiment, what need processing is the plastic shell of the back-off of semicircle profile, therefore the core rod of its high-pressure molding is a semicylinder 3, the bottom arc transition connects vertical side 31 shapes, the plastic cement material sheet of embarking on journey at last is a semicylinder 33, and the bottom arc transition connects the housing of vertical side 34 shapes.
Because described three-dimensional housing is semicylinder 33, the bottom arc transition connects the housing of vertical side 34 shapes, so its lateral punching edge of a knife position is excessive fillet place, and tolerance can be chosen 0～1mm.Die cuts is the position shown in the arrow among Fig. 5.
Identical among other parts of present embodiment and the embodiment 1.
In the present embodiment, what need processing is the plastic casing that the back-off of obvious deflection angle is arranged, so the core rod of its high-pressure molding is that the both sides, bottom of cuboid 4 are provided with inside inclined-plane 41, and then connects the pure straight side 42 of arc transition.The angle on the inclined-plane described in the present invention is 0～50 °, and the pure straight height on described inclined-plane is 0.5～3mm, and the height of pure straight side is 1～3mm.
In the present embodiment, the angle on described inclined-plane is 50 °, and the pure straight height on described inclined-plane is 3mm, and the height of pure straight side is 3mm.
The three-dimensional hull shape of the plastic cement material sheet after the process high pressure is embarked on journey is that the both sides, bottom of cuboid 44 are provided with inside inclined-plane 45, and then connects the pure straight side 46 of arc transition.Therefore, in clicking technique, the turning point on inside inclined-plane, its direction finding die-cut edge of a knife position, turning point extends 0.3～3mm, the optional 0～1mm of tolerance downwards for this reason.
Other parts and the embodiment 1 of present embodiment are identical.
Claims (1)
1. plastic shell seamless wrapping process is characterized in that it comprises following technological process:
A: printing:
The plastic sheet of needs being made plastic shell will cut into suitable size according to the size of final products; With the plastic sheet that cuts under 75～120 ℃ temperature preliminary drying to remove the moisture in the sheet material; According to design, to make silk screen and carry out chromaticity printing, printing road number is 1～20 road, and carries out the baking of IR infrared ray after the per pass printing, baking temperature is 60～120 ℃; After all color printing is finished, the plastic sheet that has printed is put into the baking box baking, stoving time is 2～4 hours, temperature is 75～130 ℃;
B: high-pressure molding:
To finish printing, and the baking dry ink plastic sheet use four the corner upper punch locating holes of common perforating press at plastic sheet, do reliable location during for the plastic sheet moulding; Using high-pressure forming machine to cooperate mould bases and the formation die core that has the back-off shape is three-dimensional housing with plastic sheet by two-dimentional cut-parts compression moulding, the process conditions of high-pressure molding: the patrix temperature is 35 ℃～170 ℃, counterdie temperature: 90 ℃～130 ℃, IR infrared ray baking temperature: 250 ℃～350 ℃, low pressure is 5～15bar, high-pressure is 20～60bar, and the cycle is 45～120s; Described three-dimensional housing is a cuboid, and the side vertical plane is when having an indent arcuate shape, and the peak that the die-cut position of its die cutting die is positioned at the circular arc of choosing the indent arc is the edge of a knife position of lateral punching, and tolerance value is chosen 0～1mm; Described core rod is shaped as: cuboid and be provided with indent deep-slotted chip breaker (1) along horizontal level in the bottom of two side; The radius of described indent deep-slotted chip breaker is determined mode: when needing bound edge to be of a size of L1, and the radius R=L1+0.3 of indent deep-slotted chip breaker～0.5mm, the degree of depth W=R of indent deep-slotted chip breaker * (1/4～1/2); Or in clicking technique, described three-dimensional housing is a semicylinder, and when the bottom arc transition connect the vertical side shape, its lateral punching edge of a knife position was excessive fillet place, and tolerance is chosen 0～1mm; Described core rod is shaped as semicylinder, and the bottom arc transition connects vertical side (3); The vertical height that described arc transition connects vertical side is 2～4mm; Or described three-dimensional housing is when being the back-off shape of deflection angle in cuboid and bottom, side have obviously, and its lateral punching edge of a knife position turning point is for this reason extended 0.3～3mm downwards, and tolerance is selected 0～1mm; Described core rod is shaped as: the both sides, bottom of cuboid are provided with inside inclined-plane (2), and then the angle that connects the vertical described inclined-plane, side of arc transition is 0～50 °, the vertical height on described inclined-plane is 0.5～3mm, and the height of vertical side is 1～3mm;
C: die-cut:
Use die cutting die to cut the waste material zone along the bending part upper end of three-dimensional housing or the upper end, knee of indent bending;
D: use common process to carry out injection moulding for finishing die-cut three-dimensional housing with dry particles, last moulding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102181237A CN101574843B (en) | 2008-12-10 | 2008-12-10 | Plastic shell seamless wrapping process and special high-pressure forming mold core thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102181237A CN101574843B (en) | 2008-12-10 | 2008-12-10 | Plastic shell seamless wrapping process and special high-pressure forming mold core thereof |
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| CN101574843A CN101574843A (en) | 2009-11-11 |
| CN101574843B true CN101574843B (en) | 2011-08-31 |
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| CN102431114B (en) * | 2011-09-22 | 2014-01-15 | 山东金麒麟股份有限公司 | Production method of disc brake pad |
| CN102431120A (en) * | 2011-11-10 | 2012-05-02 | 郭传滨 | Method for manufacturing intramode injection-molded automobile caution plates and decoration strips |
| CN104772849A (en) * | 2014-01-15 | 2015-07-15 | 无锡市科虹标牌有限公司 | Mold internal injection molding reversed edge binding process |
| CN105984073A (en) * | 2015-02-16 | 2016-10-05 | 南京瑞安电气有限公司 | Production equipment for cylindrical filter |
| WO2017177348A1 (en) * | 2016-04-14 | 2017-10-19 | 王道敏 | Novel process for embossing 3d patterns on surface of spectacle frame |
| CN110193910A (en) * | 2019-04-19 | 2019-09-03 | 叶耀 | A kind of multi-station Die Used in Pressworking for adding glass air tube glue of auto parts machinery manufacture |
| CN113547694B (en) * | 2021-06-15 | 2023-09-08 | 江苏新泉模具有限公司 | In-mold decoration process for inverted packaging of automobile interior trim product |
| CN113976728A (en) * | 2021-09-28 | 2022-01-28 | 东风汽车底盘系统有限公司 | A frock that is used for multi-functional processing of horizontal leading arm part abnormal shape |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0754119A1 (en) * | 1994-04-05 | 1997-01-22 | Minnesota Mining And Manufacturing Company | Apparatus and method for cutting and sealing porous edged sheeting |
| CN2438565Y (en) * | 2000-09-02 | 2001-07-11 | 广东科龙电器股份有限公司 | Vacuum absorbing moulding die for refrigerator door panel |
-
2008
- 2008-12-10 CN CN2008102181237A patent/CN101574843B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0754119A1 (en) * | 1994-04-05 | 1997-01-22 | Minnesota Mining And Manufacturing Company | Apparatus and method for cutting and sealing porous edged sheeting |
| CN2438565Y (en) * | 2000-09-02 | 2001-07-11 | 广东科龙电器股份有限公司 | Vacuum absorbing moulding die for refrigerator door panel |
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