CN111391219B - In-mold transfer printing system - Google Patents
In-mold transfer printing system Download PDFInfo
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- CN111391219B CN111391219B CN202010200460.4A CN202010200460A CN111391219B CN 111391219 B CN111391219 B CN 111391219B CN 202010200460 A CN202010200460 A CN 202010200460A CN 111391219 B CN111391219 B CN 111391219B
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- foil
- mold
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- parting surface
- mold transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14008—Inserting articles into the mould
- B29C45/14016—Intermittently feeding endless articles, e.g. transfer films, to the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0025—Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing
- B29C37/0028—In-mould coating, e.g. by introducing the coating material into the mould after forming the article
- B29C37/0032—In-mould coating, e.g. by introducing the coating material into the mould after forming the article the coating being applied upon the mould surface before introducing the moulding compound, e.g. applying a gelcoat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14688—Coating articles provided with a decoration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14754—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles being in movable or releasable engagement with the coating, e.g. bearing assemblies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0025—Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing
- B29C37/0028—In-mould coating, e.g. by introducing the coating material into the mould after forming the article
- B29C2037/0046—In-mould printing, in-mould transfer printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14688—Coating articles provided with a decoration
- B29C2045/14704—Coating articles provided with a decoration ink decorations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14754—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles being in movable or releasable engagement with the coating, e.g. bearing assemblies
- B29C2045/1477—Removable inserts, e.g. the insert being peeled off after moulding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an in-mold transfer printing system.A plastic injection mechanism comprises a first mold device and a second mold device which are arranged oppositely; one side of the first die device, which is opposite to the second die device, is provided with a first parting surface which is provided with at least one bending part; a second parting surface is arranged on one side of the second die device relative to the first die device; a deformable soft surface is arranged at the bending position of the first parting surface; the first die device comprises a first driving device, the first driving device is in driving connection with a transmission piece, a pressing block is arranged at the front end of the transmission piece, and the pressing block is aligned to the deformable soft surface. According to the in-mold transfer printing system provided by the invention, the pressing block is driven by the driving device to press the foil film on the product to be formed, so that the foil film can be tightly attached to the product, and the foil film is prevented from forming a foil film bulge edge at a bending position, therefore, the surface of the formed product is smooth, the quality of a finished product is ensured, and the reject ratio of the product is reduced to a certain extent.
Description
Technical Field
The invention relates to the technical field of in-mold forming, in particular to an in-mold transfer printing system.
Background
IMR (In-Mold Decoration by Roller) is a processing technology for exterior Decoration of plastic parts that can be mass-produced, also called In-Mold transfer printing, and belongs to one of In-Mold Decoration technologies of IMD (In-Mold Decoration). The basic principle of the in-mold transfer printing process is as follows: printing a pattern on a foil membrane, sending the foil membrane into a plastic mould cavity for injection moulding through an in-mould transfer printing device, and transferring an ink layer with the pattern on the foil membrane and the foil membrane to a plastic part after injection moulding in a separated manner, thereby obtaining the plastic part with the decorative pattern on the surface.
The transfer printing in the mould has the advantages that the produced plastic piece has beautiful appearance, can transfer printing more complex patterns, and can replace spraying and electroplating most importantly, thereby avoiding the pollution of the environment and the working environment caused by the traditional technology. Because the degree of automation of the in-mold transfer printing production is high and the cost of mass production is low, the in-mold transfer printing production method is widely applied to the production of plastic parts in the industries of automobiles, electronics and the like at present.
The existing IMR technology generally adopts a coil conveying device to convey foil, a pattern to be transferred is conveyed into a cavity between a second die and a fixed die, vacuum adsorption is needed to be adopted during transfer so that a foil film is attached to a parting surface of the fixed die, the edge of a product is provided with a bending part generally, so that the product is in a die assembly injection molding process, when the cavity is filled with molten plastic, the bending part of the product is prone to cause surface unevenness of the product due to factors such as foil film edge bulging, the quality of a finished product is influenced, and the reject ratio of the product can be increased to a certain degree.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for solving the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an in-mold transfer printing system comprises an injection molding mechanism, wherein the injection molding mechanism comprises a first mold device and a second mold device which are arranged in an opposite mode; one side of the first die device, which is opposite to the second die device, is provided with a first parting surface, and the first parting surface is a composite parting surface and is provided with at least one bending part; a second parting surface is arranged on one side, opposite to the first die device, of the second die device; a deformable soft surface is arranged at the bending position of the first parting surface; the first die device comprises a first driving device, the first driving device is in driving connection with a transmission piece, a pressing block is arranged at the front end of the transmission piece and aligned with the deformable soft surface, and the shape of the pressing block is the same as that of the deformable soft surface;
when the first die device and the second die device are used for die assembly and injection molding, a foil film gap for accommodating a foil film is formed between the first parting surface and the second parting surface, and the first parting surface and the second parting surface are combined to form a product cavity; the first driving device drives the pressing block to move towards the direction close to the product cavity, so that the pressing block penetrates through the deformable soft surface to press the foil film on a product to be molded.
Optionally, the deformable soft surface and the compression block are both made of high-temperature-resistant silica gel.
Optionally, the transmission member includes a transmission rod connected to the driving end of the first driving device, a transmission block is arranged at the front end of the transmission rod, a buffer spring is arranged on the transmission block, and the pressing block is connected to the buffer spring.
Optionally, the first driving device is an air cylinder.
Optionally, the foil feeding device further comprises a foil feeding mechanism, a foil feeding roller, a foil collecting mechanism and a foil collecting roller, wherein the foil feeding mechanism, the foil feeding roller, the foil collecting mechanism and the foil collecting roller form a foil film transmission path, and the foil film transmission path penetrates through a foil film gap between the first die device and the second die device.
Optionally, a tensioning mechanism for tensioning the foil is arranged on the foil film transmission path at the input end of the foil feeding roller.
Optionally, the tensioning mechanism includes two second driving devices respectively disposed at two sides of the foil film transmission path, a pressing strip is erected between driving ends of the two second driving devices, and the second driving devices drive the pressing strip to perform a lifting motion close to or far away from the foil film;
when the second driving device drives the pressing strip to press the foil, a height difference is formed between the foil positioned at the pressing strip and the foil positioned at the two sides of the pressing strip.
Optionally, the pressing strip is a rubber strip.
Optionally, the compression strip is located outside the foil film transfer path.
Optionally, the second driving device is an air cylinder.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an in-mold transfer printing system which comprises a first mold device and a second mold device which are oppositely arranged, wherein a pressing block used for pressing a foil film towards a direction close to a product cavity is arranged in the first mold device, the pressing block is driven by a driving device to press the foil film on a product to be formed, so that the foil film can be tightly attached to the product, the foil film is prevented from forming a foil film edge at a bending position, the surface of the formed product is smooth, the quality of a finished product is ensured, and the reject ratio of the product is reduced to a certain extent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of an in-mold transfer printing system according to the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is a schematic view of another embodiment of an in-mold transfer system according to the present invention;
FIG. 4 is an enlarged view of portion A' of FIG. 1;
FIG. 5 is a schematic structural diagram of a tensioning mechanism in an in-mold transfer printing system according to the present invention.
In the above figures: 10. a foil feeding mechanism; 11. a foil feeding roller; 20. a foil collecting mechanism; 21. a foil collecting roller; 30. an injection molding mechanism; 31. a first die assembly; 311. a first mold body; 312. a first parting surface; 3121. a deformable soft surface; 313. a first driving device; 314. a transmission rod; 315. a transmission block; 316. a buffer spring; 317. a compression block; 32. a second die assembly; 321. a second mold body; 322. a second parting plane; 40. a product cavity; 50. a tensioning mechanism; 51. a second driving device; 52. compressing the strips; 100. a foil membrane; 101. and transferring the pattern.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the referred devices or elements must have the specific orientations, be configured to operate in the specific orientations, and thus are not to be construed as limitations of the present invention.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example one
Referring to fig. 1 to 4, an in-mold transfer system according to an embodiment of the present invention includes an injection mechanism 30, wherein the injection mechanism 30 includes a first mold device 31 and a second mold device 32 disposed opposite to each other.
The first die assembly 31 includes a first die body 311, and a first parting surface 312 is disposed on a side of the first die body 311 opposite to the second die assembly 32. In this embodiment, the first parting surface 312 is a composite parting surface, and has at least one bent portion, which is an edge portion of a product to be molded.
Further, the second die device 32 includes a second die body 321, and a second parting plane 322 is provided at a side opposite to the first die device 31.
When the first die device 31 and the second die device 32 are closed and injected, a foil gap for accommodating a foil is formed between the first parting surface 312 and the second parting surface 322, and the foil gap can be pressed by the first parting surface 312 and the second parting surface 322 to achieve the effect of fixed positioning; the first parting surface 312 and the second parting surface 322 combine to form a product cavity 40, the shape of which product cavity 40 matches the shape of the product to be molded.
In this embodiment, the bending point of the first parting surface 312 is provided with a deformable soft surface 3121; it can be understood that the deformable soft surface 3121 may be made of soft material with high temperature resistance, and the surface of the deformable soft surface 3121 near the product cavity 40 may be smooth, and may also have a certain pattern, depending on the requirements of the product to be molded.
Furthermore, the first die arrangement 31 comprises a first drive device 313, to which a transmission is drivingly connected the first drive device 313; the transmission part comprises a transmission rod 314 connected to the driving end of the first driving device 313, a transmission block 315 is arranged at the front end of the transmission rod 314, a buffer spring 316 is arranged on the transmission block 315, and a pressing block 317 is connected with the buffer spring 316.
Further, the front end of the transmission piece is provided with a pressing block 317, the pressing block 317 is aligned with the deformable soft surface 3121, and the shape of the pressing block 317 is the same as that of the deformable soft surface 3121. When the first die device 31 and the second die device 32 are clamped for injection molding, the first driving device 313 drives the pressing block 317 to move towards the direction close to the product cavity 40, so that the pressing block 317 presses the foil film onto the product to be molded through the deformable soft surface 3121.
The pressing block 317 is used for tightly attaching the foil film to the product, so that the foil film is prevented from forming a bulge or bulge at the bent position, and the condition that the surface of the formed product is uneven is avoided.
The pressing block 317 is also made of a high-temperature-resistant soft material and is provided with a buffer spring 316 for buffering, so that deformation of a product is not easily caused while a pressing effect is ensured in a pressing process.
In this embodiment, the deformable soft surface 3121 and the pressing block 317 are made of high temperature resistant silica gel, and the first driving device 313 is an air cylinder. It is understood that the first driving device 313 may also be a driving device such as a motor, which can be adjusted according to actual requirements.
Example two
Referring to fig. 1, fig. 3 and fig. 5 again, in an embodiment of the present invention, the in-mold transfer system further includes a foil feeding mechanism 10, a foil feeding roller 11, a foil receiving mechanism 20 and a foil receiving roller 21, the foil feeding mechanism 10, the foil feeding roller 11, the foil receiving mechanism 20 and the foil receiving roller 21 form a foil transmission path, the foil transmission path penetrates through a foil gap between the first mold device 31 and the second mold device 32, a foil film having a transfer pattern is transmitted to the injection molding mechanism 30 through the foil transmission path, and after the transfer pattern is transferred to a product, the foil is continuously transmitted to the foil receiving mechanism 20 through the foil transmission path.
Furthermore, a tensioning mechanism 50 for tensioning the foil is arranged on the foil transmission path and positioned at the input end of the foil feeding roller 11, the tensioning mechanism 50 comprises two second driving devices 51 respectively arranged on two sides of the foil transmission path, a pressing strip 52 is erected between the driving ends of the two second driving devices 51, and the pressing strip 52 is positioned on the outer side of the foil transmission path; the second drive means 51 drives the compression strip 52 in a lifting movement towards or away from the foil membrane.
After first mould device 31 and second mould device 32 compound die were moulded plastics, second drive arrangement 51 drive compressing strip 52 compresses tightly the foil membrane, be located the foil membrane of compressing strip 52 department this moment and be located and form the difference in height between the foil membrane of compressing strip 52 both sides to the realization is to the tensioning effect of foil membrane, has further ensured the abundant expansion and the location of foil membrane, thereby can further ensure foil membrane and treat the inseparable laminating between the shaping product, and can ensure the roughness on shaping back product surface.
In this embodiment, the pressing strip 52 is a rubber strip, and because the rubber strip has elasticity, the rubber strip has a certain deformation limit in the process of pressing the foil membrane, so as to avoid the rupture or deformation of the foil membrane caused by over-tensioning or over-exertion.
In the present embodiment, the second driving device 51 is an air cylinder. It is understood that the first driving device 313 may also be a driving device such as a motor, which can be adjusted according to actual requirements.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an in-mold transfer printing system which comprises a first mold device 31 and a second mold device 32 which are oppositely arranged, wherein a pressing block 317 used for pressing a foil film towards a direction close to a product cavity 40 is arranged in the first mold device 31, and the pressing block 317 is driven by a driving device to press the foil film on a product to be formed, so that the foil film can be tightly attached to the product, and the foil film is prevented from forming a foil film bulge at a bending position, therefore, the surface of the formed product is smooth, the quality of a finished product is ensured, and the reject ratio of the product is reduced to a certain extent.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The in-mold transfer printing system is characterized by comprising an injection molding mechanism, wherein the injection molding mechanism comprises a first mold device and a second mold device which are arranged oppositely; one side of the first die device, which is opposite to the second die device, is provided with a first parting surface, the first parting surface is a composite parting surface and is provided with at least one bending part, and the bending part of the first parting surface is provided with a deformable soft surface; a second parting surface is arranged on one side, opposite to the first die device, of the second die device; the first die device comprises a first driving device, the first driving device is in driving connection with a transmission piece, a pressing block is arranged at the front end of the transmission piece and aligned with the deformable soft surface, and the shape of the pressing block is the same as that of the deformable soft surface;
when the first die device and the second die device are used for die assembly and injection molding, a foil film gap for accommodating a foil film is formed between the first parting surface and the second parting surface, and the first parting surface and the second parting surface are combined to form a product cavity; the first driving device drives the pressing block to move towards the direction close to the product cavity, so that the pressing block presses the foil membrane on a product to be molded through the deformable soft surface;
the transmission part comprises a transmission rod connected to the driving end of the first driving device, a transmission block is arranged at the front end of the transmission rod, a buffer spring is arranged on the transmission block, and the pressing block is connected with the buffer spring.
2. The in-mold transfer system of claim 1, wherein the flexible deformable surface and the clamping block are made of high temperature resistant silicone.
3. The in-mold transfer system according to claim 1, wherein the first driving means is an air cylinder.
4. The in-mold transfer system according to claim 1, further comprising a foil feeding mechanism, a foil feeding roller, a foil collecting mechanism, and a foil collecting roller, wherein the foil feeding mechanism, the foil feeding roller, the foil collecting mechanism, and the foil collecting roller form a foil transfer path, and the foil transfer path extends through a foil gap between the first mold device and the second mold device.
5. The in-mold transfer system according to claim 4, wherein a tensioning mechanism for achieving foil film tensioning is provided on the foil film transport path at an input end of the foil feed roller.
6. The in-mold transfer system according to claim 5, wherein the tensioning mechanism comprises two second driving devices respectively disposed at two sides of the foil film conveying path, a pressing strip is erected between the driving ends of the two second driving devices, and the second driving devices drive the pressing strip to perform a lifting motion close to or away from the foil film;
when the second driving device drives the pressing strip to press the foil, a height difference is formed between the foil positioned at the pressing strip and the foil positioned at the two sides of the pressing strip.
7. The in-mold transfer system of claim 6, wherein the compression strip is a rubber strip.
8. The in-mold transfer system according to claim 6, wherein the pressing strip is located outside the foil film transfer path.
9. The in-mold transfer system according to claim 6, wherein the second driving means is an air cylinder.
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CN202010200460.4A CN111391219B (en) | 2020-03-20 | 2020-03-20 | In-mold transfer printing system |
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CN113021771A (en) * | 2021-02-25 | 2021-06-25 | 东风延锋汽车饰件***有限公司 | Low-pressure injection molding skin cutting mold structure and using method thereof |
CN115071047B (en) * | 2022-07-14 | 2024-02-27 | 艾尔玛科技股份有限公司 | Injection mold structure for double-sided in-mold decoration printing |
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