CN101066620B - Extrusion process and apparatus for producing foamed polyolefin product - Google Patents

Extrusion process and apparatus for producing foamed polyolefin product Download PDF

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Publication number
CN101066620B
CN101066620B CN2007101108884A CN200710110888A CN101066620B CN 101066620 B CN101066620 B CN 101066620B CN 2007101108884 A CN2007101108884 A CN 2007101108884A CN 200710110888 A CN200710110888 A CN 200710110888A CN 101066620 B CN101066620 B CN 101066620B
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China
Prior art keywords
extruder
extrusion molding
foaming
olefinic polymerization
seam shape
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Application number
CN2007101108884A
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Chinese (zh)
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CN101066620A (en
Inventor
冯云平
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GUANGDONG BENDI NEW MATERIAL TECHNOLOGY CO., LTD.
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DONGGUAN CITY SPEED PACKAGING Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00Mixing; Kneading
    • B29B7/30Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/487Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws with consecutive casings or screws, e.g. for feeding, discharging, mixing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00Mixing; Kneading
    • B29B7/30Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58Component parts, details or accessories; Auxiliary operations
    • B29B7/72Measuring, controlling or regulating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00Mixing; Kneading
    • B29B7/80Component parts, details or accessories; Auxiliary operations
    • B29B7/82Heating or cooling
    • B29B7/823Temperature control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00Mixing; Kneading
    • B29B7/80Component parts, details or accessories; Auxiliary operations
    • B29B7/88Adding charges, i.e. additives
    • B29B7/885Adding charges, i.e. additives with means for treating, e.g. milling, the charges
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001Combinations of extrusion moulding with other shaping operations
    • B29C48/0012Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001Combinations of extrusion moulding with other shaping operations
    • B29C48/0022Combinations of extrusion moulding with other shaping operations combined with cutting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/385Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in separate barrels

Abstract

The present invention relates to extrusion process and apparatus for producing foamed polyethylene and polypropylene with physical foaming agent. The apparatus includes a high speed mixer, an extruder, a metering pump for feeding the extruder and a towing and cutting device connected to the extruder. The process includes mixing the polymer and the nucleator in the high speed mixer, heating and shearing the mixture in the plastic foaming extruder to form molten material, adding foaming agent and shrinkage resisting agent with the metering pump and mixing with the molten material, extruding the mixture, cooling and cutting.

Description

The device and method of extrusion molding preparation foaming olefinic polymerization Tetramune
Technical field
The present invention relates to a kind of device and method of making foaming olefinic polymerization Tetramune, especially a kind of device and method that utilizes extrusion molding and physical blowing agent to make polyethylene foamed or polypropylene articles.
Background technology
(height) polyethylene foamed is to be main raw material(s) with polyethylene (PE), adds the product that blowing agent and other processing aids make through extruding manufacturing process.Foaming product is to be uniformly distributed in foamed plastics in the material with gas, thereby has specific strength height, light weight, sound-absorbing, characteristics such as shockproof, is widely used in the packing of household electrical appliance, furniture, mechanical part, electronic instrument, precision instrument.Because highly foaming polyethylene has high foaming, obturator-type foamed plastics, make it have excellent water proofing property, thermal insulation and good floatability.Highly foaming polyethylene is compared with traditional packaging material moulded from foam EPS, have can directly reclaim, advantage that the quality softness can not damaged the packed article surface, cracky and repeatedly using not, so in the electrical package field, day by day replace the PS expanded material, and become the main material of packaging industry.Produce at present both at home and abroad polyethylene foamed, employing be to make blowing agent with low-boiling point liquid, produce the method that polyethylene foam is extruded coiled material with the mode of separate unit extruder or two extruders production.The extrusion foaming die head is based on circular, mainly by changing the setting drum external diameter, adjust the annular die gap, changing means such as hauling speed and make thickness, foam sheet goods that width is very little.It extrudes the product that the thickness of producing foamed products has only 2.0~7.0mm.Because the foamed products thickness of producing is little, can not satisfy the demand of present packaging field.
Summary of the invention
The objective of the invention is to produce the deficiency of the less foaming olefinic polymerization Tetramune of thickness, a kind of novel process units and production method thereof are provided at existing foaming olefin polymer process units.
Technical scheme of the present invention is: a kind of device of extrusion molding preparation foaming olefinic polymerization Tetramune, comprise high-speed mixer, the extruder that links to each other with high-speed mixer, the constant displacement pump that in extruder, adds materials, and the traction cutter sweep of extruder front portion, the head of described extruder is provided with a flat seam shape and extrudes head.
Preferably, described flat seam shape is extruded head and is comprised upper and lower two templates that have runner, and is used for side plate that template is sealed.
The gap of the seam shape opening that preferably, constitutes between the described bolster is 0-20mm.
Preferably, described extruding is provided with a typing cover between head and the traction cutter sweep, and described typing cover is made of two stereotype plates, has bosh on the stereotype plate, and is provided with heater.
Preferably, the both sides of two stereotype plate inside of described typing cover are provided with two transportable interior plates.
A kind of said apparatus that utilizes, the method for preparing foaming olefinic polymerization Tetramune by extrusion molding, earlier that olefin polymer plastics and nucleator blend in high-speed mixer are even, mixture is dropped in the foamed plastic extruder, material becomes the melting material through heating and the shearing of screw rod, the acting in conjunction of extruding again; After the whole meltings of material, utilize constant displacement pump to add antishrinking agent and blowing agent or only add blowing agent and mix with the melting material, the melting material that is mixed with antishrinking agent, blowing agent is subsequently lowered the temperature, is reduced pressure and extrude the formation foamed plastic from the flat seam shape molding die of extruder; The foamed plastic of extruding cools off after the traction cutter sweep cuts.
Preferably, the described foamed plastic of being extruded by the flat seam shape molding die of extruder is cooled off or is added thermal finalization through the typing cover and handled.
Preferably, described nucleator is citric acid or talcum powder or calcium carbonate or carbon black or metal powder; Described blowing agent is a physical blowing agent, is fluorochlorohydrocarbon or butane or carbon dioxide or nitrogen, or the multiple mixture in the above-mentioned substance group.
Preferably, the temperature of the flat seam shape molding die of described extruder is 50-180 ℃.
Preferably, described olefin polymer plastics are vinyon or polypropylene plastics.
Preferably, described polypropylene plastics is the polypropylene plastics of high fondant-strength or through the polypropylene plastics of modification.
Beneficial effect of the present invention is: utilize the flat seam shape molding die of gap between 0~20mm, with and the typing of front end overlap adjustable clearance opening degree, cooperate temperature to control the thickness and the density of foamed products simultaneously, can extrude continuously and produce polyethylene or high foaming plate of polypropylene plastics and section bar, make the high foamed products of thickness, thereby can satisfy the interior demand of household electrical appliance, furniture and other field for packaging material at 5-200mm.
Description of drawings
Fig. 1 is the process chart of the specific embodiment of the invention;
Fig. 2 is the structural representation of the flat seam shape molding die of the specific embodiment of the invention;
Fig. 3 is the structural representation at another visual angle of flat seam shape molding die of the specific embodiment of the invention;
Fig. 4 is the structural representation of the typing cover of the specific embodiment of the invention;
Fig. 5 is the structural representation at another visual angle of the typing cover of the specific embodiment of the invention;
Fig. 6 is the another workflow diagram of the specific embodiment of the invention.
The specific embodiment
As Fig. 1 to specific embodiments of the invention shown in Figure 5, a kind of extrusion molding prepares the device of polyethylene foamed or polypropylene articles, comprise high-speed mixer 1, the extruder 2 that links to each other with high-speed mixer 1, the constant displacement pump 3 that in extruder 2, adds materials, and the traction cutter sweep 7 of extruder 2 front portions, the head of described extruder 2 is provided with a flat seam shape and extrudes head 5.Described flat seam shape is extruded head 5 and is comprised upper and lower two templates 9,10 that have runner, and is used for side plate 11,12 that template is sealed.The gap of the seam shape opening 4 that constitutes between the described upper and lower template 9,10 is 0-20mm.Described flat seam shape extrudes head 5 and traction is provided with a typing cover 6 between the cutter sweep 7, and described typing cover 6 is made of two stereotype plates 13,14, has bosh on the stereotype plate 6, and is provided with heater.The both sides of two stereotype plate 13,14 inside of described typing cover 6 are provided with two transportable interior plates.The traction cutter sweep is made up of drive unit 15 and two folder rods 16, but drive unit 15 stepless speed regulations, two frame rods 16 under the driving of drive unit 15, clamping and draw the foaming plate of moulding, and cutting as required.
First specific embodiment of production method of the present invention, at first be 1.5% 2000 order talcum powder nucleators with vinyon (melt index is 2) and addition, blend evenly drops in the plastic foamed extruder 2 back in high-speed mixer 1, described plastic foamed extruder is two rank extrusion systems, first rank are double screw extruder, and diameter is 60mm, and the second rank screw diameter is 150mm, material is through the first rank double screw extruder heating, and its temperature is controlled at more than the vinyon melt temperature.The machine barrel heating-up temperature is respectively 120 ℃, and 150 ℃, 180 ℃, 180 ℃.Plastifying fusion material under the acting in conjunction of the shearing of twin-screw, extruding after the whole fusions of material, adds antishrinking agents with constant displacement pump 3, and addition is 3.5%; Constant displacement pump 3 adds blowing agent, addition is 12%, and make its mixing of materials under the effect of twin-screw even with fusion, the rotating speed of double screw extruder is controlled at 35 rev/mins, the material that mixes enters the second rank extruder by online runner, by regulating the temperature of the second rank plastics foam shaping by extrusion machine, the temperature process condition is that temperature will descend gradually, drop to 90 ℃ gradually from 180 ℃ of melt temperatures, plastics foam shaping by extrusion machine screw speed is controlled at 40 rev/mins, plastics foam shaping by extrusion machine internal pressure is controlled at 10MPa, the melting mixing material is controlled temperature at 100 ℃ behind flat seam shape molding die 5, regulating the clearance opening degree is 1.2mm, material is extruded decompression at die head and is discharged, and makes the fused materials cooling and shaping by cooling typing cover 6 again, and the width of cooling typing cover 6 openings is 600mm, the thickness that obtains foaming is 35mm, and width is that 600mm and density are 35kg/m 3Product.Cut then by traction cutter sweep 7 clampings and traction moulding foaming plate 8, and according to Len req.
Second specific embodiment of production method of the present invention, at first be 1.5% 2000 order talcum powder nucleators with polypropylene plastics (melt index is 2) and addition, blend evenly drops in the plastic foamed extruder 2 back in high-speed mixer 1, plastic foamed extruder is two rank extrusion systems, first rank are double screw extruder, and diameter is 60mm, and the second rank screw diameter is 150mm, material is through the first rank double screw extruder heating, and its temperature is controlled at more than the vinyon melt temperature.The machine barrel heating-up temperature is respectively 120 ℃, and 150 ℃, 180 ℃, 180 ℃.Shearing at twin-screw, plastifying fusion material under the acting in conjunction of extruding, after the whole fusions of material, constant displacement pump 3 adds blowing agent, addition is 12%, and make its mixing of materials under the effect of twin-screw even with fusion, the rotating speed of double screw extruder is controlled at 40 rev/mins, the material that mixes enters the second rank extruder by online runner, by regulating the temperature of the second rank plastics foam shaping by extrusion machine, the temperature process condition is that temperature will descend gradually, drop to 90 ℃ gradually from 180 ℃ of melt temperatures, plastics foam shaping by extrusion machine screw speed is controlled at 45 rev/mins, plastics foam shaping by extrusion machine internal pressure is controlled at 12MPa, and the melting mixing material is controlled temperature at 90 ℃ behind flat seam shape molding die 5, and regulating the clearance opening degree is 2.2mm, material is extruded decompression at die head and is discharged, make the fused materials cooling and shaping by cooling typing cover 6 again, the width of cooling typing cover 6 is 600mm, highly is 120mm.The thickness that obtains foaming is 120mm, and width is that 600mm and density are 35kg/m 3Product.Cut then by traction cutter sweep 7 clampings and traction moulding foaming plate 8, and according to Len req.
The 3rd of production method of the present invention the specifically shows embodiment as shown in Figure 6, the twin-stage extrusion device of extruder for constituting by two extrusion systems, and first order extrusion device is single screw rod or double screw extruder.It at first is 1% talcum powder nucleator with vinyon (melt index is 2) and addition, blend evenly drops in the plastic foamed extruder 2 back in high-speed mixer 1, described plastic foamed extruder is two rank extrusion systems, the first rank screw diameter is 135mm, the second rank screw diameter is 150mm, material is through the first rank extruder heating, and its temperature is controlled at more than the vinyon melt temperature.Heating-up temperature is respectively 120 ℃, and 150 ℃, 180 ℃, 180 ℃.Plastifying fusion material under the acting in conjunction of the shearing of screw rod, extruding after the whole fusions of material, adds antishrinking agents with constant displacement pump 3, and addition is 3%; And adding blowing agent, addition is 8%, and make its mixing of materials under the effect of screw rod even with fusion, plastics foam shaping by extrusion machine screw speed is controlled at 40 rev/mins, the material that mixes enters the second rank extruder by online runner, by regulating the temperature of the second rank plastics foam shaping by extrusion machine, the temperature process condition is that temperature will descend gradually, drop to 90 ℃ gradually from 180 ℃ of melt temperatures, plastics foam shaping by extrusion machine screw speed is controlled at 35 rev/mins, plastics foam shaping by extrusion machine internal pressure is controlled at 8MPa, the melting mixing material is controlled temperature at 100 ℃ behind flat seam shape molding die 5, regulating the clearance opening degree is 0.8mm, material is extruded decompression at die head and is discharged, make the fused materials cooling and shaping by cooling typing cover 6 again, the A/F of cooling typing cover 6 is 600mm, highly is 25mm.The thickness that obtains foaming is 25mm, and width is that 600mm and density are 35kg/m 3Product.Cut then by traction cutter sweep 7 clampings and traction moulding foaming plate 8, and according to Len req.
The opening of described typing cover can be regulated, so that produce the foam plastic product of different width dimensions, the mode of regulating has two kinds, and a kind of is by changing the typing cover of different bores, another kind be by with two cleat design up and down of orienting cover for moving up and down the structure of regulating open height.
In addition, the operation of making as foamed plastic in the past is identical, and the user also can pass through the conventional method of the hauling speed of adjustment hitch structure, further adjusts the thickness of polyethylene foamed or expanded polypropylene.
Every index of the product that obtains such as following table:
Expansion ratio Relative density Kg/m 3 Thickness range mm Compressive deformation amount % Load creep % Unstability load kPa Pyroconductivity w/mk Buoyancy Kg/m 3 Hot strength kPa Tensile elongation % Tearing strength N/mm
5 90~100 5~200 10 1.3 212 0.063 905 481 25 2.9
15 70~80 5~200 12 1.6 126 0.058 925 393 34 2.4
25 40~50 5~200 13 2.5 73 0.059 965 345 67 2.3
35 35~40 5~200 14 2.5 56 0.063 970 294 62 2.0
45 25~30 5~200 14 2.1 49 0.064 975 245 59 1.9

Claims (8)

1. the device of extrusion molding preparation foaming olefinic polymerization Tetramune, comprise high-speed mixer, the extruder that links to each other with high-speed mixer, the constant displacement pump that in extruder, adds materials, and the traction cutter sweep of extruder front portion, it is characterized in that: the head of described extruder is provided with a flat seam shape and extrudes head, described extruding is provided with a typing cover between head and the traction cutter sweep, described typing cover is made of two stereotype plates, have bosh on the stereotype plate, and be provided with heater.
2. the device of extrusion molding as claimed in claim 1 preparation foaming olefinic polymerization Tetramune, it is characterized in that: described flat seam shape is extruded head and is comprised upper and lower two templates that have runner, and is used for side plate that template is sealed.
3. the device of extrusion molding preparation foaming olefinic polymerization Tetramune as claimed in claim 2, it is characterized in that: the gap of the seam shape opening that constitutes between the described bolster is 0-20mm.
4. the device of extrusion molding preparation foaming olefinic polymerization Tetramune as claimed in claim 1, it is characterized in that: the both sides of two stereotype plate inside of described typing cover are provided with two transportable interior plates.
5. an extrusion molding that uses the described device of claim 1 prepares the method for foaming olefinic polymerization Tetramune, earlier that olefin polymer plastics and nucleator blend in high-speed mixer are even, mixture is dropped in the foamed plastic extruder, material becomes the melting material through heating and the shearing of screw rod, the acting in conjunction of extruding again; After the whole meltings of material, utilize constant displacement pump to add antishrinking agent and blowing agent or only add blowing agent and mix with the melting material, it is characterized in that: the melting material that is mixed with antishrinking agent, blowing agent is lowered the temperature, reduce pressure and extrude the continuous polyethylene of formation or polypropylene plastics foaming plate or section bar from the flat seam shape molding die of extruder; Plastic foamed sheet material of extruding or section bar cool off after the traction cutter sweep cuts; The described foamed plastic of being extruded by the flat seam shape molding die of extruder cools off or adds thermal finalization through the typing cover to be handled.
6. extrusion molding as claimed in claim 5 prepares the method for foaming olefinic polymerization Tetramune, and it is characterized in that: described nucleator is citric acid or talcum powder or calcium carbonate or carbon black or metal powder; Described blowing agent is a physical blowing agent, is fluorochlorohydrocarbon or butane or carbon dioxide or nitrogen, or the multiple mixture in the above-mentioned substance group.
7. extrusion molding as claimed in claim 5 prepares the method for foaming olefinic polymerization Tetramune, and it is characterized in that: the temperature of the flat seam shape molding die of described extruder is 50-180 ℃.
8. the method for preparing foaming olefinic polymerization Tetramune as extrusion molding as described in claim 6 or 7, it is characterized in that: described olefin polymer plastics are vinyon or polypropylene plastics, and described polypropylene plastics is the polypropylene plastics of high fondant-strength or the polypropylene plastics of modification.
CN2007101108884A 2007-06-13 2007-06-13 Extrusion process and apparatus for producing foamed polyolefin product Active CN101066620B (en)

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CN101591450B (en) * 2009-05-31 2012-03-14 孙和永 Process for producing pearl cotton
CN103434153A (en) * 2013-09-06 2013-12-11 山东通佳机械有限公司 Plastic extrusion type physical low-foaming molding method
CN104744843B (en) * 2015-03-31 2018-07-06 青岛欧克斯新型建材有限公司 A kind of adiabatic graphite polystyrene foam plastics extruded sheet
CN109109255A (en) * 2017-06-23 2019-01-01 广东奔迪新材料科技有限公司 A kind of plate using general grade polypropylene foam shaping by extrusion
DE102017222860A1 (en) * 2017-12-15 2019-06-19 Trumpf Laser- Und Systemtechnik Gmbh Workpiece support of a processing machine for processing workpieces and processing machine with a workpiece support
CN108864525A (en) * 2018-05-28 2018-11-23 苏州国立塑料制品有限公司 A kind of preparation method and applications of wear-resistant Pearl wool material
CN110091513A (en) * 2019-04-03 2019-08-06 惠州市鑫裕丰包装材料有限公司 A kind of preparation method of the composite board of fabric and EPE

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CN201132378Y (en) * 2007-06-28 2008-10-15 深圳市奔迪包装有限公司 Device for preparing foaming olefin polymer products by extrusion method

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