WO2008151978A1 - Verfahren und vorrichtung zum verpacken von polykristallinem siliciumbruch - Google Patents
Verfahren und vorrichtung zum verpacken von polykristallinem siliciumbruch Download PDFInfo
- Publication number
- WO2008151978A1 WO2008151978A1 PCT/EP2008/056989 EP2008056989W WO2008151978A1 WO 2008151978 A1 WO2008151978 A1 WO 2008151978A1 EP 2008056989 W EP2008056989 W EP 2008056989W WO 2008151978 A1 WO2008151978 A1 WO 2008151978A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bag
- filling
- polycrystalline silicon
- plastic
- packaging
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B25/00—Packaging other articles presenting special problems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B29/00—Packaging of materials presenting special problems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B39/00—Nozzles, funnels or guides for introducing articles or materials into containers or wrappers
- B65B39/12—Nozzles, funnels or guides for introducing articles or materials into containers or wrappers movable towards or away from container or wrapper during filling or depositing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B55/00—Preserving, protecting or purifying packages or package contents in association with packaging
- B65B55/24—Cleaning of, or removing dust from, containers, wrappers, or packaging ; Preventing of fouling
Definitions
- the invention relates to a method and apparatus for packaging polycrystalline silicon fracture.
- Polycrystalline silicon (polysilicon) is predominantly deposited by means of Siemens process from trichlorosilane and then crushed for applications in the solar industry mostly low contamination and crushed for applications in the semiconductor industry and then partially cleaned. Depending on the intended application, the polysilicon break obtained after packaging may contain the maximum impurities in metal elements mentioned in Tab. 1.
- polysilicon breakage for the electronics industry must be in 5 kg bags with a weight tolerance of
- contamination of the polysilicon breach occurs when filling the bag with polysilicon break by contact with the inside of the filling and bag forming tube.
- the design-related high fall height of the polysilicon fracture, or the abrasion caused by the sharp-edged hole causes Lysilicium breakage that the plastic coating is so far worn after about 100 tons of packaged material that parts of the filling and bag forming tube must be replaced.
- the polysilicon break often pierces the bag wall due to the high drop height during filling.
- Tab. 2 Increase in contamination of polysilicon breakage in manual packaging Information in pptw
- the object of the invention is to provide a method which allows a low-cost low-contamination packaging of sharp-edged polysilicon breakage.
- the object is achieved by a method in which polycrystalline silicon is filled by means of a filling device in a freely hanging, finished shaped bag, wherein the filled bag is then sealed, characterized in that the bag made of high-purity plastic with a wall thickness of 10 to 1000 ⁇ m exists.
- the dispenser comprises a free-hanging energy absorber of a non-metallic low-contaminant material which is introduced into the plastic bag prior to charging the polycrystalline silicon.
- the polycrystalline silicon is filled into the plastic bag via the energy absorber.
- the freely suspended energy absorber is then removed from the filled with polycrystalline silicon plastic bag and the plastic bag is sealed.
- the process is suitable both for packaging polysilicon breakage for solar applications and polysilicon breakage for the electronics industry. It is also suitable for the packaging of polysilicon granules, because even in this case occurs a reduction in the contamination of the granules by plastic abrasion during filling of the PE bag. Particularly suitable is the method and the device according to the invention for the Packaging sharp-edged, up to 10 kg polycrystalline silicon fragments. The advantages are particularly noticeable in the presence of fragments with an average weight of more than 80 g.
- the process according to the invention makes it possible to achieve as high a productivity in the packaging of polysilicon for the solar industry with a reduced contamination of the polysilicon fracture as a packaging machine according to EP1334907.
- the method according to the invention allows the same quality with regard to contamination of the silicon and penetration rate the bag increases productivity to four times the manual packaging.
- a low-contamination material is to be understood as meaning a material which, after contact with the polysilicon, contaminates the surface of the polysilicon at most as follows: metals by a factor of 10, preferably factor 5, particularly preferably a factor less than or equal to 1 higher than indicated in Table 2; Dopant values boron, phosphorus, arsenic, antimony less than 10ppta, preferably less than 2ppta; Carbon less than 300pptw.
- the contamination is measured by subtraction "contamination of a Si piece after contact with the material” minus "contamination of the Si piece before contact with the material”.
- the high-purity plastic is preferably polyethylene (PE) polyethylene terephthalate (PET) or polypropylene (PP).
- the plastic in BuIk and on the surface no additives to antistatika, z. SiO 2, or lubricants, such as long-chain organic compounds (eg, erucamides).
- the plastic bag is held during filling with polysilicon breakage by means of at least two pincer-shaped grippers and fed by means of these grippers a closure device, preferably a welding device.
- a closure device preferably a welding device.
- the 10 to 1000 .mu.m thick PE bag is removed by means of the gripper before filling from a reservoir and opened.
- the gripping arm grips the PE bags preferably at the edge.
- the plastic bag can be lifted from a belt by means of a vacuum suction device and introduced individually into the packaging device.
- the freely suspended, flexible energy absorber made of a non-metallic low-contamination material preferably has the shape of a funnel or hollow body, for. B. a hose or a square tube, or a side parallel to
- Longitudinal direction z. T slit hollow body, or a slatted curtain, or of several elongated plates, strands or rods. It is preferably made of textile material (eg Gore-Tex® - PTFE fabric or polyester / polyamide fabric), plastics (eg PE, PP, PA, or copolymers of these plastics). Particularly preferably it consists of a rubber-elastic plastic, z. As PU, rubber rubber or ethylene vinyl acetate (EVA), with a Shore A hardness between 30 A and 120 A, preferably 70 A.
- the closing of the plastic bag can be done for example by means of welding, gluing or positive locking. Preferably, it is done by welding.
- the filling device preferably consists of a filling unit and the freely suspended energy absorber, which is connected to the filling unit.
- the free-hanging energy absorber has the form of a freely suspended movable support.
- the flexible flexible hose is inserted into the bag and the poly-rupture is introduced into the bag via the filling unit and the flexible tube.
- the filling unit is preferably a funnel, a conveyor trough or a slide, which are lined with a low-contamination material or consist of a low-contamination material. After filling the bag, the flexible flexible hose is pulled out of the bag and the bag is then welded.
- the free-hanging energy absorber absorbs a large part of the kinetic energy of the polysilicon fracture falling in the bag. It protects the walls of the plastic bag from the
- the air is sucked out of the bag during the closing until a vacuum of 10 to 700 mbar is formed. Preference is given to a vacuum of 500 mbar.
- the polysilicon is first portioned and weighed prior to packaging by means of the method according to the invention.
- the portioning and weighting of the polysilicon fraction is carried out by means of a manual or automatic method known from the prior art. Due to the free choice of the method, even the required high weighing accuracy of less than +/- 0.6% for polysilicide fracture can be achieved for the semiconductor industry.
- the resulting contamination of the polysilicon is irrelevant since, in the case of contamination above the permissible limit values, in a preferred embodiment the contaminated polysilicon is cleaned before packaging.
- the polysilicon fracture is first weighed as described, portioned and purified in a process cell in a portioned units via a filling device with freely suspended flexible hose from a non-metallic low-contamination material in a likewise freely hanging, high purity Plastic bag introduced and then the plastic bag is closed.
- the cleaning of the polysilicon fracture in the process bowl is carried out as known from the prior art, it is preferably carried out chemically, for. As described in EP 0905 796 Bl.
- This variant of the packaging method according to the invention has a productivity increased by more than 100% (kg Si per employee hour) compared to manual packaging, with the same quality of the packaged polysilicon break.
- All process variants are preferably carried out under flow boxes, or for semiconductor material under cleanroom conditions of class ⁇ 100.
- the result of this is that the method is preferably carried out by means of a rotary-type filling and closing machine or similar packaging machine types in which there is no circular arrangement of the filling and closing stations, in which the filling device is provided with a freely suspended flexible hose is provided non-metallic low-contamination material through which the polysilicon break in a high-purity, free-hanging plastic bag, z. B. of PE or PP falls.
- This process variant is particularly suitable for the packaging of polysilicon breakage for the electronics industry due to the increased purity requirements.
- the bag obtained according to one of the variants of the method is again placed in a plastic bag, for. B. made of LD-PE, with a wall thickness of 10 to 1000 microns and welded.
- a plastic bag for. B. made of LD-PE, with a wall thickness of 10 to 1000 microns and welded.
- This is preferably done again by means of the method according to the invention, wherein instead of the polysilicon break now filled with polysilicon break sealed plastic bag is filled in the second plastic bag and the second plastic bag is sealed, preferably welded.
- the bags or double bags are then packed in boxes.
- the filled and sealed PE bags are re-weighed. In an overweight or underweight, these few bags are discharged. For the bags with the incorrect weight, the weight is manually corrected, the polysilicon is possibly again cleaned, transferred to a new bag and sealed.
- Method 2 a.) Differential weighing of the process tray before and after emptying. b.) With a weight deviation of +/- 30 g, the procedure stops automatically and the operator carries out a manual correction. c.) After weight correction, the method according to the invention continues to fill the PE bag.
- the invention further relates to an apparatus for packaging polycrystalline silicon fracture or polysilicon granules.
- This device includes a filling station and a closure station in which a PE bag suspended from a gripper system is moved from station to station in a clock sequence, characterized in that the filling station comprises a freely suspended tube made of a non-metallic low-contamination material (For example, plastic) which is introduced into the PE bag with polycrystalline silicon before filling the PE bag and is removed from the PE bag after filling the PE bag with polycrystalline silicon and the filled PE bag by means of the Gripper system is transported in the closure station and closed there.
- a non-metallic low-contamination material Form example, plastic
- the welded bag is then transferred via a gripping system or a conveyor belt to the machine part for attaching the outer bag.
- the gripper system comprises two grippers and is arranged such that all parts of the gripper system are located laterally or below the opened bag. This arrangement of the gripper system avoids contamination of the inside of the bag.
- the closure device / closure station is preferably a welding device, particularly preferably a heat-seal welding device based on a heated welding wire, which is preferably made of a non-metallic material, for. As Teflon, is sheathed.
- the closure device may also be a gluing or form-locking device.
- the conveyor is, for example, a conveyor trough or a chute, preferably a chute.
- the tube has a diameter of 10 to 50 cm, a length of 5 to 50 cm, a wall thickness of 0.1 to 100 mm and an inclination angle of 1 to 120 degrees to the plane of the conveyor.
- Preferred is a diameter of 20 to 30 cm (particularly preferably 25 cm), an inclination angle of 80 to 100 degrees (particularly preferably 90 degrees), a length of 10 to 20 cm (particularly preferably 15 cm) and a wall thickness of 1 to 10 mm (more preferably 5 mm).
- the free-moving tube absorbs the impact from the polysilicon during free fall into the PE bag in such a way that significantly less damage occurs than with the baghouse machine. This is the case even when filling with Polybruchsorten with a mean edge length greater than 100 mm and weights of the individual poly fragments between 2000 to 10,000 g.
- the poly-filled bag is delivered to the sealing station.
- this station is preferably a heat sealer, in which the metallic welding wire preferably with a non-metallic see material, eg. As Teflon, is sheathed.
- the PE bag is welded by means of the heat sealer.
- the air is sucked out of the bag until a vacuum of 10 to 700 mbar is formed. Preference is given to a vacuum of 500 mbar.
- a manual portioning and weighing takes place prior to packaging in the device according to the invention.
- the cleaning is preferably carried out as described in EP 0905 796 B1.
- the sealed bag is dispensed to a second device according to the invention for attaching an outer bag.
- a second device for attaching an outer bag.
- the inner bag for leveling the bag on a conveyor belt can be easily shaken.
- the sealed, polysilicon-filled bag is placed in a second PE bag.
- a second PE bag opened.
- the PE double bag filled with poly-rupture is delivered to the closure station.
- this station there is preferably a heat-seal welder, in which the metallic
- welding wire with a non-metallic material eg. As Teflon, is sheathed.
- the PE outer bag is now welded.
- the air is sucked out of the bag until a vacuum of 10 to 700 mbar is formed.
- a vacuum of 500 mbar is particularly preferred.
- a former laterally adjoining the PE bag can be used to form the filled bag square and not bulbous.
- a square-shaped flat bag can be much easier after closing in a box with intermediate compartments bring. The easier insertion compared to the bulbous bag minimizes the risk of an increase in the puncture rate.
- the welded double bag is delivered by the grippers via a conveyor system, such as a gripping system or a conveyor belt to the final package. In the final packaging, the double bag is inserted into the shipping carton.
- a conveyor system such as a gripping system or a conveyor belt
- fraction sizes 1 to 5 mentioned in the examples are fragments of polycrystalline silicon having the following properties:
- Example 1 Packaging According to the Invention
- the filled bag was then manually inserted into an outer bag and sealed as described above. After welding, the bags were each placed in a shipping carton. Then the cardboard was sealed.
- the carton was first opened, the bags removed, opened and emptied.
- the empty bags were examined as follows: Bags punctured were optically detected by immersion in a water bath. For bags with holes, air bubbles rose. The area of the thus identified holes per bag in mm 2 was determined by measuring and adding the individual hole areas per bag.
- Table 3 shows a comparison of the processes according to Example 1 according to the invention) and Example 2 (Comparative Example).
- Tab. 3 shows that with the packaging method according to the invention, at least equally good, and for the fracture sizes 5, 4 and 3 even better values with regard to the puncture rate and the hole area in mm 2 per bag are achieved for all fractions of silicon, as with the conventional less productive manual process.
- the automatic packaging method according to the invention meets the high demands of the electronics industry, which have hitherto only been achieved by manual packaging.
- Example 4 Packing of portioned and cleaned polyethylene breakage with a device according to the invention (modified rotary filling and closing machine)
- Polysilicon breakage was portioned by hand to 5 kg and this portioned polysilicon break was chemically cleaned (as described in EP0905796B1). Subsequently, the cleaned fracture was filled in a clean room via a flexible plastic hose into a 300 ⁇ m thick high-purity PE bag handled by a rotary filling and closing machine and the bag was welded.
- Tab. 5 shows that the metal surface values, or the total contamination by the process sequence according to the invention "Portioning -> Cleaning -> Automatic packaging with a Device according to the invention "compared to the standard manual packaging method (Table 1) for electronic applications, is not significantly increased, and the level of contamination by the automatic packaging, or this process variant must therefore be at the level shown in Table 2.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Basic Packing Technique (AREA)
- Silicon Compounds (AREA)
- Wrappers (AREA)
- Packages (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/664,418 US8833042B2 (en) | 2007-06-13 | 2008-06-05 | Method and device for packaging polycrystalline bulk silicon |
CN200880019939.5A CN101678905B (zh) | 2007-06-13 | 2008-06-05 | 用于包装粉碎的多晶硅材料的方法和装置 |
KR1020107000488A KR101178311B1 (ko) | 2007-06-13 | 2008-06-05 | 분쇄된 다결정 실리콘 재료를 포장하기 위한 방법 및 장치 |
DE502008003432T DE502008003432D1 (de) | 2007-06-13 | 2008-06-05 | Verfahren und vorrichtung zum verpacken von polykristallinem siliciumbruch |
EP08760566A EP2152588B1 (de) | 2007-06-13 | 2008-06-05 | Verfahren und vorrichtung zum verpacken von polykristallinem siliciumbruch |
AT08760566T ATE508050T1 (de) | 2007-06-13 | 2008-06-05 | Verfahren und vorrichtung zum verpacken von polykristallinem siliciumbruch |
CA2689053A CA2689053C (en) | 2007-06-13 | 2008-06-05 | Method and device for packaging crushed polycrystalline silicon material |
JP2010511585A JP2010528955A (ja) | 2007-06-13 | 2008-06-05 | 多結晶シリコン破砕物を包装する方法及び装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007027110.9 | 2007-06-13 | ||
DE102007027110A DE102007027110A1 (de) | 2007-06-13 | 2007-06-13 | Verfahren und Vorrichtung zum Verpacken von polykristallinem Siliciumbruch |
Publications (1)
Publication Number | Publication Date |
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WO2008151978A1 true WO2008151978A1 (de) | 2008-12-18 |
Family
ID=39711848
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/056989 WO2008151978A1 (de) | 2007-06-13 | 2008-06-05 | Verfahren und vorrichtung zum verpacken von polykristallinem siliciumbruch |
Country Status (9)
Country | Link |
---|---|
US (1) | US8833042B2 (de) |
EP (1) | EP2152588B1 (de) |
JP (1) | JP2010528955A (de) |
KR (1) | KR101178311B1 (de) |
CN (1) | CN101678905B (de) |
AT (1) | ATE508050T1 (de) |
CA (1) | CA2689053C (de) |
DE (2) | DE102007027110A1 (de) |
WO (1) | WO2008151978A1 (de) |
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EP2743190A1 (de) * | 2012-12-14 | 2014-06-18 | Wacker Chemie AG | Verpackung von polykristallinem Silicium |
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DE102011003875A1 (de) | 2011-02-09 | 2012-08-09 | Wacker Chemie Ag | Verfahren und Vorrichtung zum Dosieren und Verpacken von Polysiliciumbruchstücken sowie Dosier- und Verpackungseinheit |
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JP6200857B2 (ja) | 2014-06-03 | 2017-09-20 | 信越化学工業株式会社 | 多結晶シリコンロッドの製造方法、多結晶シリコンロッド、および、多結晶シリコン塊 |
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Also Published As
Publication number | Publication date |
---|---|
CN101678905A (zh) | 2010-03-24 |
CA2689053C (en) | 2013-08-06 |
EP2152588B1 (de) | 2011-05-04 |
US8833042B2 (en) | 2014-09-16 |
KR101178311B1 (ko) | 2012-08-29 |
CA2689053A1 (en) | 2008-12-18 |
ATE508050T1 (de) | 2011-05-15 |
EP2152588A1 (de) | 2010-02-17 |
KR20100018060A (ko) | 2010-02-16 |
CN101678905B (zh) | 2012-03-21 |
DE102007027110A1 (de) | 2008-12-18 |
JP2010528955A (ja) | 2010-08-26 |
US20100154357A1 (en) | 2010-06-24 |
DE502008003432D1 (de) | 2011-06-16 |
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