CN111055473A - EPP epidermis plasticizing reduction molding process - Google Patents
EPP epidermis plasticizing reduction molding process Download PDFInfo
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- CN111055473A CN111055473A CN202010004384.XA CN202010004384A CN111055473A CN 111055473 A CN111055473 A CN 111055473A CN 202010004384 A CN202010004384 A CN 202010004384A CN 111055473 A CN111055473 A CN 111055473A
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4823—Moulds with incorporated heating or cooling means
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—Measuring, controlling or regulating
- B29C49/783—Measuring, controlling or regulating blowing pressure
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—Measuring, controlling or regulating
- B29C49/786—Temperature
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4823—Moulds with incorporated heating or cooling means
- B29C2049/4825—Moulds with incorporated heating or cooling means for cooling moulds or mould parts
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4823—Moulds with incorporated heating or cooling means
- B29C2049/4838—Moulds with incorporated heating or cooling means for heating moulds or mould parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides an EPP epidermis plasticizing reduction molding process, which comprises the following steps: s1, heating the die: heating the mold core of the mold to be plasticized to 170-250 ℃ by using a mold temperature controller; s2, feeding: pressurizing the raw material by 0.01-0.8 Mpa, and pressurizing and blowing the EPP raw material into a die cavity of a die by a feeding mechanism; s3, heating the EPP raw material: heating the EPP raw material in the die cavity by using steam until the surface of the EPP raw material is melted and is bonded with the solid EPP raw material in the die cavity for 0 to 20 seconds; s4, cooling: introducing water or air into the die cavity of the die, and cooling the formed EPP product; s5, demolding: and opening the mold for taking out the EPP product molded in the previous procedure. By the EPP skin plasticizing reduction molding process provided by the invention, the rigidity strength of the processed and molded product can be higher than that of the traditional product after the skin is plasticized, and the density of the product can be effectively increased, thereby reducing the volume of the product.
Description
Technical Field
The invention relates to the technical field of equipment for processing and molding polypropylene materials, in particular to an EPP skin plasticizing reduction molding process.
Background
EPP (expanded polypropylene) is a high-crystallinity polymer/gas composite material with excellent performance, namely a polypropylene plastic foaming material, and becomes the fastest-growing environment-friendly novel compression-resistant buffering and heat-insulating material at present due to unique and superior performance. The EPP product has excellent shock-resistant and energy-absorbing performance, high recovery rate after deformation, good heat resistance, chemical resistance, oil resistance and heat insulation, and light weight, and can greatly reduce the weight of the product. EPP is also an environment-friendly material, can be recycled and can be naturally degraded without causing white pollution.
Because of the advantages of EPP, its application fields are becoming more and more extensive. For example, IT products, electronic communication equipment, precision instruments and meters, etc. are beginning to adopt EPP as a packaging material in large quantities. Another particularly important field of application is the extensive use in the automotive industry: automobile bumpers, automobile side shockproof cores, high-grade safety automobile seats, tool boxes, instrument panels and the like. According to the statistical data, the method comprises the following steps: the current average amount of plastic used for each automobile is 100-130 kg, wherein, the amount of EPP plastic used is about 4-6 kg. The field of use also includes boxes that are currently used by express riders of take-out companies to contain take-out.
In the prior art, the process for manufacturing products by using EPP materials is complex, the products made by using EPP materials can be subjected to various environments when in use, such as severe environments with much water, grease and dust, and the surfaces of the EPP materials are rough, so that when the existing EPP materials are used as surface structures and are in contact with the severe environments, bodies of the EPP materials are polluted by grease and dust, the cleaning is difficult, the aging is aggravated, and the service life is shortened.
Disclosure of Invention
The invention aims to solve the problems that products made of EPP materials are difficult to clean and easy to age due to rough surfaces, and provides an EPP skin plasticizing reduction molding process aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an EPP epidermis plasticizing reduction molding process comprises the following steps:
s1, heating the die: heating the mold core of the mold to be plasticized to 170-250 ℃ by using a mold temperature controller;
s2, feeding: pressurizing the raw material by 0.01-0.8 Mpa, and pressurizing and blowing the EPP raw material into a die cavity of a die by a feeding mechanism;
s3, heating the EPP raw material: heating the EPP raw material in the die cavity by using steam until the surface of the EPP raw material is melted and is bonded with the solid EPP raw material in the die cavity for 0 to 20 seconds;
s4, cooling: introducing water or air into the die cavity of the die, and cooling the formed EPP product;
s5, demolding: and opening the mold for taking out the EPP product molded in the previous procedure.
Further, in step S1, the mold temperature controller is used to control the mold core heating temperature to 170-220 ℃.
Further, in step S2, the pressure applied to the EPP raw material is 0.1MPa to 0.6 MPa;
further, in step S2, the feeding mechanism is a discharging barrel.
Further, the cooling process in step S4 further includes, before or after the step of introducing water or air, evacuating the cavity of the mold to a vacuum state to cool the molded EPP product.
A product manufactured by EPP epidermis plasticizing reduction molding process.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides an EPP skin plasticizing reduction molding process, which blows EPP raw material into a mold cavity of a mold through a feeding mechanism under high pressure, different pressurizing strengths are applied to a discharging barrel, generally 0.01-0.8 Mpa, a mold core in the mold cavity is preheated to a certain temperature, such as 170-, the EPP material has the advantages that the EPP material is in a severe environment with much water, grease and dust, meanwhile, the body of the EPP material is stained with grease and dust, the EPP material is very easy to scrub, and meanwhile, the compact surface also avoids the aging condition caused by direct contact of the product and sunlight, so that the service life of the product is prolonged to a greater extent;
2. the EPP product after being plasticized by the skin can obtain higher rigidity and strength than the traditional product, and the density of the product can be effectively increased, so that the volume of the product is reduced. Meanwhile, various seed coat processing effects and grain effects are added in the surface treatment process of the mold core, so that the effect of a high-gloss mirror surface and various exquisite texture patterns can be obtained, and the molded product can be suitable for more fields.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the functions of the invention clearer and easier to understand, the invention is further described by combining the following specific embodiments:
example 1
A kind of EPP epidermis plasticization reduction shaping craft, as the content shown in table 1 below, adjust the temperature controller of the mould temperature (hereinafter referred to as mould temperature machine) to 170 deg.C at first, the temperature that is adopted is high or low to influence the plasticized speed of epidermis and thickness of epidermis of EPP products that is shaped, the higher the temperature, the faster the production speed, has reduced the barrel and pressurized the air consumption, 170 deg.C-220 deg.C is a more common parameter in the actual production. Different temperatures can be selected for heating according to different requirements, for example, if the skin is required to be thin, the parameters with lower temperature can be selected, and if the skin is required to be thin, the parameters with higher temperature can be selected for production. In this example, the EPP product produced at 170 ℃ had a thin skin.
In the embodiment, the rotating discharge barrel is used, and the foaming polypropylene beads are melted in the mold core slowly, so that the pressure in the discharge barrel is set to be 0.8Mpa, and the foaming polypropylene beads in the discharge barrel are blown into the mold core by using higher pressure, so that the EPP raw material can be better attached to the inner cavity of the mold core and compacted tightly. The pressure range of the discharge barrel is 0.01-0.8 MPa, and 0.1-0.6 MPa is the pressure value which is more commonly used in production; for different product structure requirements, different pressures can be adopted, and the pressure is low, so that the formed EPP product has loose tissue, the skin plasticizing speed is low, and the speed of the expanded polypropylene beads entering the die cavity is low; and the pressure that goes out the storage bucket setting is big more, then the pan feeding speed is fast more, and the closely knit degree of product after the EPP shaping is high more, and the plastify speed is fast more, but if exceed 0.8Mpa then the pipeline for the pan feeding can be damaged, drop, increase manufacturing cost, on the other hand, can press raw and other materials in closely knit, influence product quality.
Firstly, an open-close type discharging barrel is used for pressurizing and blowing EPP raw materials into a die cavity of a die, the feeding of the open-close type discharging barrel is more uniform and stable, and the EPP raw materials in the die cavity are heated by steam until the surface of the EPP raw materials is melted and then are bonded with the solid EPP raw materials in the die cavity and are kept for 0 s; in the actual production process, the holding time influences the thickness of the plasticized skin of the formed EPP product, the holding time is determined according to the actual production requirement, then water or air is introduced into the die cavity of the die to cool the formed EPP product, the water is introduced to cool the surface of the EPP formed product, the air is introduced to cool, high-temperature gas in the die cavity of the die is replaced, the temperature is rapidly reduced, and after the air is introduced, the die cavity of the die is pumped into a vacuum state, so that the hot air in the formed EPP product is pumped away, the heat in the EPP product is pumped away, and the formed EPP product is cooled.
Example 2
In this example, the mold temperature was first adjusted to 170 ℃, the EPP raw material was expanded polypropylene beads, and the pressure in the discharge tank was set to 0.6 MPa.
Firstly, EPP raw materials are pressurized and blown into a die cavity of a die by using an open-close type discharging barrel, the feeding of the open-close type discharging barrel is more uniform and stable, the EPP raw materials in the die cavity are heated by using steam until the surface of the EPP raw materials is melted and the solid EPP raw materials in the die cavity are bonded together and kept for 10 s.
Example 3
In this example, the mold temperature was first adjusted to 190 ℃, the EPP raw material was expanded polypropylene beads, and the pressure in the discharge tank was set to 0.5MPa, which resulted in less gas consumption than in example 2.
Firstly, EPP raw materials are pressurized and blown into a die cavity of a die by using an open-close type discharging barrel, the feeding of the open-close type discharging barrel is more uniform and stable, and the EPP raw materials in the die cavity are heated by using steam until the surface of the EPP raw materials is melted and then are bonded with the solid EPP raw materials in the die cavity and are kept for 12 s. In this embodiment, compared to the previous embodiment, the plasticized skin thickness of the EPP product after molding is thicker, the cavity of the mold is evacuated to a vacuum state, the high-temperature gas in the cavity of the mold is replaced, and then water is introduced into the cavity of the mold in order to cool the surface of the EPP molded product and rapidly lower the temperature.
Example 4
In this example, the mold temperature was first adjusted to 210 ℃, the EPP raw material was expanded polypropylene beads, and the pressure in the discharge tank was set to 0.4MPa, which resulted in less gas consumption than in example 3.
Firstly, use open-close type ejection of compact bucket to blow EPP raw and other materials pressurization to the die cavity of mould in, open-close type ejection of compact bucket pan feeding is more even, and is stable, uses steam to heat the EPP raw and other materials of die cavity in, and it is in the same place and keep 5s to melt its surface back and inside solid-state EPP raw and other materials bonding, and production efficiency is higher. The mold cavity of the mold is vacuumized, high-temperature gas in the mold cavity is replaced, and then water is introduced into the mold cavity of the mold, so that the water is introduced to cool the surface of an EPP molded product and the temperature is rapidly reduced.
Example 5
In this example, the mold temperature was first adjusted to 220 ℃, the EPP raw material was expanded polypropylene beads, and the pressure in the discharge tank was set to 0.35MPa, which resulted in less gas consumption than in example 4.
Firstly, use open-close type ejection of compact bucket to blow EPP raw and other materials pressurization to the die cavity of mould in, open-close type ejection of compact bucket pan feeding is more even, and is stable, uses steam to heat the EPP raw and other materials in the die cavity, bonds together and keeps 15s with inside solid-state EPP raw and other materials after its surface melts, compares in the hold time weak point, and the EPP product surface after the shaping is more smooth, and simultaneously, the plasticized thickness of epidermis is bigger. The mold cavity of the mold is vacuumized, high-temperature gas in the mold cavity is replaced, and then water is introduced into the mold cavity of the mold, so that the water is introduced to cool the surface of an EPP molded product and the temperature is rapidly reduced.
Example 6
In this example, the temperature of the mold temperature controller was first adjusted to 240 ℃, the production efficiency was higher, the EPP raw material was expanded polypropylene beads, the pressure in the discharge tank was set to 0.1Mpa, and compared to example 5, the gas consumption was lower, the structure of the molded EPP product was looser, and the plasticized skin was thinner.
Firstly, EPP raw materials are pressurized and blown into a die cavity of a die by using an open-close type discharging barrel, the feeding of the open-close type discharging barrel is more uniform and stable, the EPP raw materials in the die cavity are heated by using steam until the surface of the EPP raw materials is melted and then bonded with the solid EPP raw materials in the die cavity and kept for 6s, and compared with an embodiment with long keeping time, the EPP product forming speed is higher. The mold cavity of the mold is vacuumized, high-temperature gas in the mold cavity is replaced, and then water is introduced into the mold cavity of the mold, so that the water is introduced to cool the surface of an EPP molded product and the temperature is rapidly reduced.
Example 7
In this embodiment, the temperature of the mold temperature controller is first adjusted to 250 ℃, the temperature of the mold core is heated to 250 ℃, the EPP raw material, i.e., the expanded polypropylene beads, can be rapidly attached to the inner cavity of the mold core at a high temperature, the surface can be melted in a short time, the overall production efficiency is higher, the pressure in the discharge barrel is set to 0.01Mpa, compared with other embodiments, the air consumption of this embodiment is less, the gaps between the tissue molecules of the formed EPP product are larger, and therefore, the material consumption of the expanded polypropylene beads is reduced, the skin plasticizing process is fast, and the production time is shorter.
Firstly, use open-close type ejection of compact bucket to blow EPP raw and other materials pressurization to the die cavity of mould in, open-close type ejection of compact bucket pan feeding is more even, and is stable, uses steam to heat the EPP raw and other materials in the die cavity, bonds with inside solid-state EPP raw and other materials and keeps 20s after its surface melts for the EPP product surface after the shaping is more smooth, but, the plasticized thickness of epidermis is bigger. The mold cavity of the mold is vacuumized, high-temperature gas in the mold cavity is replaced, and then water is introduced into the mold cavity of the mold, so that the water is introduced to cool the surface of an EPP molded product and the temperature is rapidly reduced.
The invention also requests to protect a product manufactured by the EPP epidermis plasticizing reduction molding process, the traditional EPP product has uniform texture, and the invention plasticizes a layer of film on the surface of the EPP product, so that the EPP product using the invention can bear worse use environment, and can be engraved with characters after surface plasticizing, and has wider application. Such as electronic communication equipment, automobile bumpers, automobile side shockproof cores, high-level safety automobile seats, toolboxes, instrument panels and the like, and also comprises a box for containing takeaway by express riders of current takeaway companies.
TABLE 1
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (6)
1. The EPP skin plasticizing reduction molding process is characterized by comprising the following steps:
s1, heating the die: heating the mold core of the mold to be plasticized to 170-250 ℃ by using a mold temperature controller;
s2, feeding: pressurizing the raw material by 0.01-0.8 Mpa, and pressurizing and blowing the EPP raw material into a die cavity of a die by a feeding mechanism;
s3, heating the EPP raw material: heating the EPP raw material in the die cavity by using steam until the surface of the EPP raw material is melted and is bonded with the solid EPP raw material in the die cavity for 0 to 20 seconds;
s4, cooling: introducing water or air into the die cavity of the die, and cooling the formed EPP product;
s5, demolding: and opening the mold for taking out the EPP product molded in the previous procedure.
2. The EPP skin plasticizing reduction molding process of claim 1, wherein in step S1, the mold temperature controller is used to heat the mold core to 170-220 ℃.
3. The EPP skin plasticizing reduction molding process according to claim 1 or 2, wherein the pressure applied to the EPP raw material in step S2 is 0.1MPa to 0.6 MPa.
4. The EPP skin plasticizing reduction molding process according to claim 3, wherein the feeding mechanism in step S2 is a discharging barrel.
5. The EPP skin plasticizing reduction molding process of claim 3, wherein the cooling process in step S4 further comprises evacuating the cavity of the mold before or after the step of introducing water or air to cool the molded EPP product.
6. A product manufactured by an EPP skin plasticizing reducing molding process of any one of claims 1, 2 or 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010004384.XA CN111055473A (en) | 2020-01-03 | 2020-01-03 | EPP epidermis plasticizing reduction molding process |
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| CN202010004384.XA CN111055473A (en) | 2020-01-03 | 2020-01-03 | EPP epidermis plasticizing reduction molding process |
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| CN111055473A true CN111055473A (en) | 2020-04-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113858506A (en) * | 2021-09-24 | 2021-12-31 | 无锡会通轻质材料股份有限公司 | Smooth surface forming process for foamed polypropylene product |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108340530A (en) * | 2017-12-29 | 2018-07-31 | 昆山巴鸣泡沫塑料制品有限公司 | A kind of incubator surface skining technique |
| CN109366840A (en) * | 2018-11-27 | 2019-02-22 | 四川力登维汽车部件有限公司 | A kind of EPP product integral forming process with plasticizing dermatoglyph layer |
| CN109501098A (en) * | 2018-11-27 | 2019-03-22 | 四川力登维汽车部件有限公司 | It is a kind of once to graft moulding process with the bright EPP product for being plasticized layer |
-
2020
- 2020-01-03 CN CN202010004384.XA patent/CN111055473A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108340530A (en) * | 2017-12-29 | 2018-07-31 | 昆山巴鸣泡沫塑料制品有限公司 | A kind of incubator surface skining technique |
| CN109366840A (en) * | 2018-11-27 | 2019-02-22 | 四川力登维汽车部件有限公司 | A kind of EPP product integral forming process with plasticizing dermatoglyph layer |
| CN109501098A (en) * | 2018-11-27 | 2019-03-22 | 四川力登维汽车部件有限公司 | It is a kind of once to graft moulding process with the bright EPP product for being plasticized layer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113858506A (en) * | 2021-09-24 | 2021-12-31 | 无锡会通轻质材料股份有限公司 | Smooth surface forming process for foamed polypropylene product |
| CN113858506B (en) * | 2021-09-24 | 2023-11-28 | 无锡会通轻质材料股份有限公司 | Smooth surface forming process for foaming polypropylene product |
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