CN112936826A - Suction and compression composite process in mold - Google Patents
Suction and compression composite process in mold Download PDFInfo
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- CN112936826A CN112936826A CN202110137805.0A CN202110137805A CN112936826A CN 112936826 A CN112936826 A CN 112936826A CN 202110137805 A CN202110137805 A CN 202110137805A CN 112936826 A CN112936826 A CN 112936826A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000002131 composite material Substances 0.000 title claims abstract description 29
- 238000007906 compression Methods 0.000 title claims abstract description 20
- 230000006835 compression Effects 0.000 title abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 107
- 238000001816 cooling Methods 0.000 claims abstract description 93
- 239000000463 material Substances 0.000 claims abstract description 38
- 238000003825 pressing Methods 0.000 claims abstract description 13
- 238000000605 extraction Methods 0.000 claims abstract description 10
- 239000004033 plastic Substances 0.000 claims description 55
- 239000012528 membrane Substances 0.000 claims description 52
- 238000005520 cutting process Methods 0.000 claims description 13
- 238000013329 compounding Methods 0.000 claims description 12
- 238000001179 sorption measurement Methods 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 239000002985 plastic film Substances 0.000 claims description 6
- 229920006255 plastic film Polymers 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 230000001788 irregular Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 abstract description 15
- 238000005507 spraying Methods 0.000 abstract description 7
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 6
- 239000012943 hotmelt Substances 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002345 surface coating layer Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002547 anomalous effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 230000002508 compound effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000289 melt material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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Classifications
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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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/50—Removing moulded articles
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/52—Heating or cooling
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
- B29C51/421—Heating or cooling of preforms, specially adapted for thermoforming
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/44—Removing or ejecting moulded articles
-
- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an in-mold suction and compression composite process, and provides a suction and compression composite mold which comprises a fixed mold, a movable mold, an air extraction system, a heating system and a cooling system, wherein a first heating/cooling plate is arranged in the movable mold, a second heating/cooling plate is arranged in the fixed mold, a plurality of air holes are formed in the first heating/cooling plate and the second heating/cooling plate respectively, the first heating/cooling plate and the second heating/cooling plate are connected with the air extraction system, the heating system and the cooling system, and the air extraction system is used for extracting air to the outside of the fixed mold or the movable mold so as to enable the inside of the fixed mold or the inside of the movable mold to form negative pressure. The invention provides an in-mold suction and pressing composite process capable of forming finished products in one step, which is characterized in that a surface treatment material is integrally formed and pressed on the surface of the products by adopting the combination of a suction molding process and a mold pressing process, the bonding strength between the products and a surface coating is high, and the environmental pollution caused by secondary spraying is avoided.
Description
Technical Field
The invention relates to the technical field of compression molding, in particular to an in-mold suction and compression compounding process.
Background
In the field of rubber and plastic processing and forming, processes such as injection molding, mold pressing, blow molding and plastic sucking are mostly adopted, but more and more raw materials are limited, particularly plastic composite materials with poor flowability are mostly subjected to mold pressing, and for diversified demands of products, a plurality of products need to be subjected to surface treatment, such as spraying, double-layer co-pressing, adsorption heat sealing and the like. For example, the treatment of the plastic-containing garbage after classified recovery is a difficult problem in the conventional garbage recovery, and for the production of the plastic-containing garbage products, the conventional surface spraying mode has many problems, on one hand, the conventional treatment mode usually cannot be formed at one time, and needs to be processed for many times, so that the overall processing efficiency is reduced due to the increase of process steps, on the other hand, the secondary spraying on the surfaces of the products causes environmental pollution, and the spraying mode cannot be adopted for treatment, so that the products and the surface coating layer can not be combined more sufficiently, and the surface coating layer is not firm enough.
Disclosure of Invention
The invention aims to provide an in-mold suction and compression composite process, which can be used for forming a finished product in one step, integrally forming a surface treatment material and laminating the surface treatment material on the surface of the product by adopting the combination of a suction molding process and a mold pressing process, has high bonding strength between the product and a surface coating and avoids environmental pollution caused by secondary spraying.
In order to achieve the purpose, the invention provides the following technical scheme: an in-mold suction and pressure composite process provides a suction and pressure composite mold, which comprises a fixed mold, a movable mold, an air exhaust system, a heating system and a cooling system, a first heating/cooling plate is arranged in the movable mold, a second heating/cooling plate is arranged in the fixed mold, the first heating/cooling plate and the second heating/cooling plate are both provided with a plurality of air holes, the air holes are communicated with an air pumping system, the first heating/cooling plate and the second heating/cooling plate are connected with the air pumping system, the heating system and the cooling system, the air extraction system is used for extracting air to the outside of the fixed die or the outside of the movable die so as to form negative pressure inside the fixed die or the movable die, the heating system is used to heat either the first heating/cooling plate or the second heating/cooling plate, the cooling system is used for cooling the first heating/cooling plate or the second heating/cooling plate;
the in-mold suction and pressure composite process comprises the following steps:
placing a plastic-absorbing membrane subjected to heating softening treatment between a movable mold and a fixed mold, pressing and sealing the periphery of the plastic-absorbing membrane in contact with the movable mold or the fixed mold by using a blank holder or a blank holder, starting an air exhaust system and a heating system to enable the interior of the fixed mold or the interior of the movable mold to form negative pressure, adsorbing the plastic-absorbing membrane on the inner surface of the fixed mold or the inner surface of the movable mold, and keeping certain adsorption time and heating time to enable the plastic-absorbing membrane to be completely attached to the inner surface of the fixed mold or the inner surface of the movable mold;
step two, maintaining the air exhaust pressure in the step one, and injecting or paving the product material into the fixed die which is adsorbed with the plastic suction membrane in a hot melting state;
step three, controlling the movable mold to approach to the fixed mold so as to extrude the product material in the fixed mold and keep a certain extrusion force;
step four, closing the heating system and starting the cooling system, and keeping cooling for 0.5-5 minutes under the extrusion force in the step three;
and step five, when the material product is cooled to the demolding temperature, controlling the movable mold to move in the direction away from the fixed mold for demolding so as to obtain a finished product of the product.
Preferably, the first step further comprises cutting the plastic suction membrane to remove the redundant part of the plastic suction membrane when the plastic suction membrane is completely attached to the inner surface of the fixed die or the inner surface of the movable die.
Preferably, the movable die is provided with a cutting piece, and in the third step, when the movable die and the fixed die are mutually extruded, the plastic film is cut so as to remove the redundant part of the plastic film.
Preferably, the air extraction system comprises a first control valve and a second control valve which are respectively used for controlling the communication of an air extraction pipeline in the fixed die and an air extraction pipeline in the movable die, and heating/cooling pipelines and corresponding control valves are respectively arranged in the fixed die and the movable die.
Preferably, the diameters of a plurality of air holes formed in the first heating/cooling plate and the second heating/cooling plate are both 0.1-5 mm.
Preferably, a plurality of projections with irregular shapes are arranged on one side of the movable mold close to the fixed mold.
Preferably, an accommodating chamber for accommodating a product material is arranged on one side, close to the movable die, of the fixed die, and the air holes are arranged in the accommodating chamber in an encrypted manner at the bent part of the accommodating chamber.
Preferably, the air holes are arranged in an encrypted manner at the bent parts of the lugs on the movable die.
Preferably, the hot melting temperature of the plastic suction membrane is more than or equal to that of the product material, and the plastic suction membrane has thermoplasticity.
Preferably, the average thickness of the plastic uptake film before adsorption in the step one is 0.5mm-3 mm.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a suction-compression composite die, which comprises an air exhaust system, a heating system and a cooling system, wherein a first heating/cooling plate is arranged in a movable die, a second heating/cooling plate is arranged in a fixed die, a plurality of air holes are formed in the first heating/cooling plate and the second heating/cooling plate respectively and communicated with the air exhaust system, and the air holes are used for forming negative pressure in the movable die or the fixed die.
The invention relates to an in-mold suction and pressure composite process, which comprises the steps of firstly placing a plastic suction membrane subjected to heating softening treatment between a movable mold and a fixed mold, then starting an air exhaust system and a heating system to enable negative pressure to be formed inside the fixed mold or inside the movable mold, adsorbing the plastic suction membrane on the inner surface of the fixed mold or the inner surface of the movable mold, keeping certain adsorption time and heating time to enable the plastic suction membrane to be completely attached to the inner surface of the fixed mold or the inner surface of the movable mold, then keeping the air exhaust pressure, and injecting or paving a product material into the fixed mold with the plastic suction membrane in a hot melting; the processing technology of the invention adopts the combination of the plastic suction technology and the mould pressing technology to integrally form and press the surface treatment material on the surface of the product, and the bonding strength between the product and the surface coating is high.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of a suction-compression composite mold in an in-mold suction-compression composite process according to the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of a suction-compression composite mold in an in-mold suction-compression composite process according to the present invention;
FIG. 3 is a schematic structural diagram of a fixed mold in a suction-pressing composite mold in the in-mold suction-pressing composite process of the present invention.
In the figure: 1. moving the mold; 101. the bump, 2, the first plastic absorption layer; 3. obtaining a finished product; 4. a second blister layer; 5. fixing a mold; 6. and (4) air holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments 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.
As shown in fig. 1, a first embodiment of the present invention provides an in-mold suction-compression composite process, which provides a suction-compression composite mold, where the suction-compression composite mold includes a fixed mold 5, a movable mold 1, an air exhaust system, a heating system and a cooling system, a first heating/cooling plate is disposed in the movable mold 1, a second heating/cooling plate is disposed in the fixed mold 5, a plurality of air holes are disposed on the first heating/cooling plate, the air holes are communicated with the air exhaust system, the first heating/cooling plate is connected with the air exhaust system, the heating system and the cooling system, the second heating/cooling plate is connected with the cooling system, the heating system is configured to heat the first heating/cooling plate, and the cooling system is configured to cool the first heating/cooling plate or the second heating/cooling plate;
the in-mold suction and compression compounding process under the first embodiment comprises the following steps:
placing a plastic-absorbing membrane subjected to heating softening treatment between a movable mold and a fixed mold, pressing and sealing the periphery of the plastic-absorbing membrane contacted with the movable mold 1 by using a blank holder or a blank holder, starting an air exhaust system and a heating system to enable the interior of the movable mold 1 to form negative pressure, adsorbing the plastic-absorbing membrane on the inner surface of the movable mold 1, and keeping certain adsorption time and heating time to enable the plastic-absorbing membrane to be completely attached to the inner surface of the fixed mold 5 or the inner surface of the movable mold 1;
step two, maintaining the air exhaust pressure in the step one, and injecting or paving the product material into the fixed die 5 in a hot melting state;
step three, controlling the movable die 1 to approach the fixed die 5 so as to extrude the product material in the fixed die 5 and keep a certain extrusion force;
step four, closing the heating system of the movable mold 1, starting the cooling system to refrigerate the first heating/cooling plate and the second heating/cooling plate, and keeping cooling for 0.5-5 minutes under the extrusion force in the step three;
and step five, when the material product is cooled to the demolding temperature, controlling the movable mold 1 to move in the direction away from the fixed mold 5 for demolding to obtain a finished product 3.
According to the material property of the processed product, a plastic film with high thermoplasticity is selected as a surface treatment material, the surface treatment material is cooled to a certain temperature (generally 40-100 ℃ according to the property of the surface treatment material), and the product with the surface treatment is demoulded to obtain a finished product 3.
Preferably, the first step further comprises cutting the plastic suction membrane to remove the redundant part of the plastic suction membrane when the plastic suction membrane is completely attached to the inner surface of the fixed die 5 or the inner surface of the movable die 1, and the cutting mode can be manual cutting or automatic cutting.
Preferably, the movable die 1 is provided with a cutting piece, the fixed die 5 can be provided with a corresponding cutting knife seam, and the cutting of the plastic suction membrane is realized to remove the redundant part of the plastic suction membrane when the movable die 1 and the fixed die 5 are mutually extruded in the step three, so that the automatic cutting is realized.
Preferably, the air exhaust system comprises a first control valve for controlling the communication of an air exhaust pipeline in the fixed die 5, and heating/cooling pipelines and corresponding control valves are arranged in the fixed die 5 and the movable die 1.
Preferably, the diameters of a plurality of air holes formed in the first heating/cooling plate and the second heating/cooling plate are 0.1-5mm, and the air holes are too small, so that the processing is inconvenient, and the air holes are easily blocked by fine particles, and the plastic suction layer is deformed due to too large air holes.
Preferably, a plurality of irregular bumps 101 are arranged on one side of the movable mold 1 close to the fixed mold 5, a certain pattern is formed by the irregular bumps 101, and a certain processing pattern is formed on the upper surface of a product through mutual extrusion between the movable mold 1 and the fixed mold 5.
As shown in fig. 2, a second embodiment of the present invention provides an in-mold suction and compression composite process, which provides a suction and compression composite mold, the suction and compression composite mold includes a fixed mold 5, a movable mold 1, an air pumping system, a heating system and a cooling system, a first heating/cooling plate is disposed in the movable mold 1, a second heating/cooling plate is disposed in the fixed mold 5, a plurality of air holes are disposed on the first heating/cooling plate and the second heating/cooling plate, the first heating/cooling plate and the second heating/cooling plate are connected to the air pumping system, the heating system and the cooling system, the air pumping system is used for pumping air to the outside of the fixed mold 5 and the outside of the movable mold 1 to form a negative pressure inside the fixed mold 5 or the inside of the movable mold 1, the heating system is used for heating the first heating/cooling plate and the second heating/cooling plate, the cooling system is used for cooling the first heating/cooling plate and the second heating/cooling plate;
the in-mold suction and pressure composite process comprises the following steps:
the method comprises the following steps that firstly, two plastic-absorbing membranes which are subjected to heating softening treatment are respectively placed between a movable die and a fixed die, the peripheries of the two plastic-absorbing membranes which are respectively contacted with the movable die 1 and the fixed die 5 are pressed and sealed by using a blank holder or a blank holder frame, so that the plastic-absorbing membranes and the sides which are respectively contacted with the movable die 1 and the fixed die 5 form sealing areas, an air suction system and a heating system are started, negative pressure is respectively formed inside the fixed die 5 and the movable die 1, the two plastic-absorbing membranes are respectively adsorbed on the inner surface of the fixed die 5 and the inner surface of the movable die 1, and certain adsorption time and heating time are kept, so that the plastic-absorbing membranes;
step two, maintaining the air exhaust pressure in the step one, and injecting or paving the product material into the fixed die 5 which is adsorbed with the plastic suction membrane in a hot melting state;
step three, controlling the movable die 1 to approach the fixed die 5 so as to extrude the product material in the fixed die 5 and keep a certain extrusion force;
step four, closing the heating system and starting the cooling system, and keeping cooling for 0.5-5 minutes under the extrusion force in the step three;
and step five, when the material product is cooled to the demolding temperature, controlling the movable mold 1 to move in the direction away from the fixed mold 5 for demolding to obtain a finished product 3.
According to the material property of the processed product, a plastic film with high thermoplasticity is selected as a surface treatment material, the surface treatment material is cooled to a certain temperature (generally 40-100 ℃ according to the property of the surface treatment material), and the product with the surface treatment is demoulded to obtain a finished product 3.
As shown in fig. 3, an accommodating chamber for accommodating a product material is arranged on one side of the fixed mold 5 close to the movable mold 1, and a plurality of air holes are densely arranged at the bent part of the accommodating chamber.
Preferably, the air holes are arranged in an encrypted manner at the bent part of the bump 101 on the movable die 1, so that the plastic suction membrane is completely attached to the protruding pattern on the inner surface of the movable die 1.
Preferably, the hot melt temperature of plastic uptake diaphragm is more than or equal to the hot melt temperature of goods material, if the hot melt temperature of plastic uptake diaphragm is less than the hot melt temperature of goods material, in the 5 mutual extruded in-process of fixed mould 1 in the third step, when the plastic uptake diaphragm contacts with goods material in hot melt state, because the hot melt temperature of goods material is high, the plastic uptake diaphragm can be heated and take place deformation, be equipped with the anomalous lug 101 of a plurality of shapes on the movable mould 1 in addition, the strap of the extrusion force that each point received at the in-process with goods material contact is different, can aggravate the deformation of plastic uptake diaphragm, will lead to the plastic uptake diaphragm not to press according to predetermined shape and cover on goods material surface like this, lead to compound effect variation.
The plastic suction membrane has thermoplasticity, can flow and deform when being heated, and can keep a certain shape after being cooled.
Preferably, the average thickness of the plastic suction membrane before adsorption in the first step is 0.5mm-3mm, so that the plastic suction membrane can be covered on all parts of the surface of the product, if the average thickness of the plastic suction membrane before adsorption in the first step is too small, the plastic suction membrane can be cracked in the air suction process, and if the average thickness of the plastic suction membrane before adsorption in the first step is too large, due to the existence of the gravity and the thermoplastic property thereof, the process that the plastic suction membrane after heating and softening treatment is placed between the movable mold and the fixed mold and is adsorbed on the surface of the mold under the condition of no damage is difficult to realize technically.
The working principle is as follows: the invention provides a suction-compression composite die, which comprises an air exhaust system, a heating system and a cooling system, wherein the heating system and the cooling system can adopt a waterway heating or cooling mode, correspondingly, a first heating/cooling plate is arranged in a movable die 1, a second heating/cooling plate is arranged in a fixed die 5, a plurality of air holes are respectively arranged on the first heating/cooling plate and the second heating/cooling plate, and the air holes are communicated with the air exhaust system and are used for forming negative pressure in the movable die 1 or the fixed die 5, through the arrangement of the structure, a finished product 3 of a product can be molded at one time, the production efficiency is improved, the cost of surface treatment of the product is reduced due to one-time molding economically, the pollution caused by secondary spraying and compounding is avoided from the environmental protection, and the temperature of a melt material of the product and the pressure molding combination between surface attachments are more sufficient on the product, higher adhesion, firmer product and more beautiful surface.
The invention relates to an in-mold suction and pressure composite process, which comprises the steps of firstly putting a plastic suction membrane subjected to heating and softening treatment between a movable mold and a fixed mold (the plastic suction membrane can be uniformly heated by baking or hot air heating), then starting an air suction system and a heating system to enable the inside of the fixed mold 5 or the inside of a movable mold 1 to form negative pressure, adsorbing the plastic suction membrane on the inner surface of the fixed mold 5 or the inner surface of the movable mold 1, keeping certain adsorption time and heating time to enable the plastic suction membrane to be completely attached to the inner surface of the fixed mold 5 or the inner surface of the movable mold 1, then keeping the air suction pressure, and injecting or paving a product material into the fixed mold 5 which is adsorbed with; the processing technology of the invention adopts the combination of the plastic suction technology and the mould pressing technology to integrally form and press the surface treatment material on the surface of the product, and the bonding strength between the product and the surface coating is high.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. An in-mold suction and pressure composite process is characterized by comprising a fixed mold (5), a movable mold (1), an air exhaust system, a heating system and a cooling system, wherein a first heating/cooling plate is arranged in the movable mold (1), a second heating/cooling plate is arranged in the fixed mold (5), a plurality of air holes are formed in the first heating/cooling plate and the second heating/cooling plate respectively and communicated with the air exhaust system, the first heating/cooling plate and the second heating/cooling plate are connected with the air exhaust system, the heating system and the cooling system, the air exhaust system is used for exhausting air to the outside of the fixed mold (5) or the outside of the movable mold (1) to enable the inside of the fixed mold (5) or the inside of the movable mold (1) to form negative pressure, the heating system is used for heating the first heating/cooling plate or the second heating/cooling plate, the cooling system is used for cooling the first heating/cooling plate or the second heating/cooling plate;
the in-mold suction and pressure composite process comprises the following steps:
placing a plastic suction membrane subjected to heating softening treatment between a movable mold (1) and a fixed mold (5), pressing and sealing the periphery of the plastic suction membrane in contact with the movable mold (1) or the fixed mold (5) by using a blank holder or a blank holder frame, starting an air exhaust system and a heating system to enable the inside of the fixed mold (5) or the inside of the movable mold (1) to form negative pressure, adsorbing the plastic suction membrane on the inner surface of the fixed mold (5) or the inner surface of the movable mold (1), and keeping certain adsorption time and heating time to enable the plastic suction membrane to be completely attached to the inner surface of the fixed mold (5) or the inner surface of the movable mold (1);
step two, maintaining the air exhaust pressure in the step one, and injecting or paving the product material into the fixed die (5) adsorbed with the plastic suction membrane in a hot melting state;
step three, controlling the movable mold (1) to approach the fixed mold (5) so as to extrude the product material in the fixed mold (5) and keep a certain extrusion force;
step four, closing the heating system and starting the cooling system, and keeping cooling for 0.5-5 minutes under the extrusion force in the step three;
and step five, when the material product is cooled to the demolding temperature, controlling the movable mold (1) to move towards the direction far away from the fixed mold (5) for demolding so as to obtain a finished product (3).
2. The in-mold suction and pressure compounding process based on claim 1 is characterized in that: the first step also comprises the step of cutting the plastic suction membrane to remove the redundant part of the plastic suction membrane when the plastic suction membrane is completely attached to the inner surface of the fixed die (5) or the inner surface of the movable die (1).
3. The in-mold suction and pressure compounding process based on claim 1 is characterized in that: the cutting piece is arranged on the movable die (1), and the cutting of the plastic film is realized to remove the redundant part of the plastic film when the movable die (1) and the fixed die (5) are mutually extruded in the step three.
4. The in-mold suction-compression compounding process according to any one of claims 1 to 3, characterized in that: the air extraction system comprises a first control valve and a second control valve which are respectively used for controlling the communication of an air extraction pipeline in the fixed die (5) and an air extraction pipeline in the movable die (1), and heating/cooling pipelines and corresponding control valves are respectively arranged in the fixed die (5) and the movable die (1).
5. The in-mold suction and pressure compounding process based on claim 4 is characterized in that: the diameters of a plurality of air holes formed in the first heating/cooling plate and the second heating/cooling plate are 0.1-5 mm.
6. The in-mold suction and pressure compounding process based on claim 5 is characterized in that: and a plurality of bumps (101) with irregular shapes are arranged on one side of the movable mold (1) close to the fixed mold (5).
7. The in-mold suction and pressure compounding process based on claim 6 is characterized in that: one side of the fixed die (5) close to the movable die (1) is provided with an accommodating chamber for accommodating product materials, and the air holes are arranged at the bent part of the accommodating chamber in an encrypted manner.
8. The in-mold suction and pressure compounding process based on claim 6 is characterized in that: the air holes are arranged in an encrypted manner at the bent parts of the convex blocks (101) on the movable die (1).
9. The in-mold suction and pressure compounding process based on claim 8 is characterized in that: the hot melting temperature of the plastic suction membrane is more than or equal to that of the product material, and the plastic suction membrane has thermoplasticity.
10. The in-mold suction and pressure compounding process based on claim 9 is characterized in that: the average thickness of the plastic suction membrane before adsorption in the step one is 0.5mm-3 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110137805.0A CN112936826A (en) | 2021-02-01 | 2021-02-01 | Suction and compression composite process in mold |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110137805.0A CN112936826A (en) | 2021-02-01 | 2021-02-01 | Suction and compression composite process in mold |
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| CN101804682A (en) * | 2009-02-13 | 2010-08-18 | 东莞亿东机器有限公司 | Secondary mould pressing in-mould decorating injection forming method |
| CN107443715A (en) * | 2016-05-31 | 2017-12-08 | 上海汽车集团股份有限公司 | Manufacture the mould and method of vehicle noise insulation pad |
| CN108638532A (en) * | 2018-04-27 | 2018-10-12 | 滁州晨润工贸有限公司 | Overlay film one-pass molding system in a kind of flexure plane template die |
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2021
- 2021-02-01 CN CN202110137805.0A patent/CN112936826A/en active Pending
Patent Citations (3)
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| CN101804682A (en) * | 2009-02-13 | 2010-08-18 | 东莞亿东机器有限公司 | Secondary mould pressing in-mould decorating injection forming method |
| CN107443715A (en) * | 2016-05-31 | 2017-12-08 | 上海汽车集团股份有限公司 | Manufacture the mould and method of vehicle noise insulation pad |
| CN108638532A (en) * | 2018-04-27 | 2018-10-12 | 滁州晨润工贸有限公司 | Overlay film one-pass molding system in a kind of flexure plane template die |
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| 陈孝康等: "《实用模具手册》", 31 December 2001, 中国轻工业出版社, pages: 167 * |
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