Silicon chip transport container

Abstract

Silicon chip shipping container The present invention relates to a transport container including at least three film bags or at least three double film bags filled with silicon pieces, each of which has a weight capacity of 0.88 to 1.62 kg / dm 3 and the double film bag has a packing density of 0.68 to 1.15 kg / dm 3 and the transport container containing the film bag has a packing density of 0.88 to 1.32 kg / dm 3 and the transport container containing the double film bag has a packing density of 0.68 to 1.02 kg / dm 3 and having a packing density of However, this relates to a transport container in which the packing density of the film bag or the double film bag is equal to or greater than the packing density of the transport container, and in which the silicon pieces belong to at least one of fragment size classes 0, 1, 2, 3 or 4.

Description

[Technical Field]

[0001] The present invention relates to a transport container comprising at least three film bags or at least three double film bags filled with silicon pieces. [Background technology]

[0002] Polycrystalline silicon (polysilicon) is typically produced by the Siemens process (chemical vapor deposition). Polysilicon is the starting material for the production of single-crystal silicon, which is produced by, for example, the Czochralski process. Polysilicon is also required for the production of polycrystalline silicon, for example, by block casting. In either process, the polysilicon produced in the Siemens process in ingot form must be crushed, typically into pieces.

[0003] Contamination can cause dislocation defects (one-dimensional fractures) and stacking faults (two-dimensional fractures) in the crystal structure, so silicon pieces must be packaged for transport in a way that minimizes contamination. Packaging is typically done in bags with welded plastic film or double-layered film bags. Double-layered film bags typically reduce the risk of perforation by sharp debris. For efficient transportation, the bags, in various numbers, are placed inside surrounding packaging, usually cardboard boxes. The surrounding packaging is then stacked on conventional pallets and placed in cargo containers as needed.

[0004] Perforations in the bags can occur not only during filling but also during transport, particularly as a result of vibration, shaking, or shifting of the bags. These events generally lead to unnecessary further crushing. Before further use, the resulting fine fraction must, as a rule, be removed in an additional operation, as it is harmful to further processing.

[0005] The main causes of perforations and further shattering are excessive free movement of the bag within the surrounding packaging and movement of fragments of the bag itself, while too high a packing density within the bag and / or the surrounding packaging promotes punctures and subsequent contamination.

[0006] WO2015 / 007490A1 describes a method for manufacturing a polysilicon sheet containing at least two plastic bags with a resistance of 650 kg / m 3 up to 950 kg / m 3 The document discloses a transport container with a packing density of 1000 sq. ft. The plastic bags are arranged so that they overlap each other, and the total volume of each bag is 2.4 to 3.0 sq. ft. of the volume of the pieces in the bag. The drawback is that the arrangement of the bags creates voids, which makes it impossible to ensure optimal space utilization when loading the cargo container. Summary of the Invention

[0007] To maximize the economic efficiency of land and sea transport, a high packing density is advantageous, for example to maximize the load capacity of ISO containers (cargo containers; see ISO standard 668). However, for the reasons mentioned above, it is necessary to find a middle ground that minimizes the risks of both contamination and further shattering. This problem has given the present invention its objective.

[0008] This object is achieved by a transport container containing at least three film bags or at least three double film bags filled with silicon pieces, each of which has a capacity of 0.88 to 1.62 kg / dm 3 , preferably 0.99 to 1.49 kg / dm 3 The double film bag has a packing density of 0.68 to 1.15 kg / dm 3 , preferably 0.77 to 1.05 kg / dm 3 The transport container containing the film bag has a packing density of 0.81 to 1.23 kg / dm 3 , preferably 0.89 to 1.14 kg / dm 3 The transport container containing the double film bag has a packing density of 0.65 to 1.06 kg / dm 3 , preferably 0.73 to 0.97 kg / dm 3wherein the film bag or the double film bag has a packing density equal to or greater than the packing density of the transport container. Furthermore, the silicon pieces belong to at least one of fragment size classes 0, 1, 2, 3, or 4. [Brief explanation of the drawings]

[0009] [Figure 1] Figure 1 shows the layers of the two flat bags. [Figure 2] Figure 2 shows the layers of the three flat bags. [Figure 3] FIG. 3 shows the layers of the four flat bags. [Figure 4] FIG. 4 shows a shipping container with nine flat bags. [Figure 5] FIG. 5 shows a shipping container with six stand-up pouches. [Figure 6] FIG. 6 shows a shipping container with nine stand-up pouches. [Figure 7] FIG. 7 shows a shipping container with 12 stand-up pouches. [Figure 8] FIG. 8 shows a shipping container with 18 stand-up pouches. [Figure 9] FIG. 9 shows a pallet with six shipping containers. [Figure 10] FIG. 10 shows a pallet with 24 shipping containers. [Figure 11] FIG. 11 shows a pallet with 16 shipping containers. [Figure 12] FIG. 12 shows a pallet with 18 shipping containers. [Figure 13] FIG. 13 shows a pallet with 12 shipping containers. [Figure 14] FIG. 14 shows a pallet with 20 shipping containers. DETAILED DESCRIPTION OF THE INVENTION

[0010] The packing density of a film bag (single film bag) is defined as the ratio of the weight of the contained silicon pieces (content weight) to the volume of the bag.

[0011] The bag is preferably a double film bag including a first film bag and a second film bag, and the silicon piece is disposed in the first film bag surrounded by the second film bag.

[0012] The packing density of a double film bag is defined as the ratio of the weight of the contents to the volume of the second film bag. In calculating packing density, the weight of all packaging materials can be ignored. Generally, in a filled and sealed state, the air (which may be an inert gas) trapped between the first and second bags increases the volume of the double film bag.

[0013] The first and second film bags may have the same dimensions in an unfilled state. The first and second film bags may also be made of the same material, but the film thickness may be different. Where appropriate, the second film bag is preferably made of a more robust material than the first film bag.

[0014] The film bag is preferably made of plastic, more preferably polyethylene (PE), polyethylene terephthalate (PET), or polypropylene (PP). Alternatively, the film bag may be made of a two- or multi-layer composite film. The thickness of the film or composite film is typically within the range of 10 to 1000 μm, preferably 50 to 500 μm, and more preferably 100 to 300 μm. The film bag generally has an airtight closure and can be closed by welding, adhesive bonding, stitching, or form-fitting. Where appropriate, the film bag is at least partially evacuated during filling. For the design of film bags, their filling, and sealing, reference can be made to EP2743190 A1 and EP2730510 A1.

[0015] The volume of a closed film bag can be determined by placing it in a water bath and displacing the water corresponding to the volume of the bag.

[0016] The packing density of a shipping container is defined as the ratio of the weight of the contents to the internal volume of the shipping container.

[0017] The shipping container is preferably made of cardboard, more particularly of cubic shape (for example a folding carton whose lid and base may each be formed from four closing flaps).

[0018] The film bag and double film bag contain silicon pieces of one fragment size class, preferably polysilicon pieces. One transport container generally contains silicon pieces of the same fragment size class. It may be preferable to combine film bags or double film bags filled with silicon pieces of different fragment size classes into one transport container. It may also be preferable to mix silicon pieces of two or more fragment size classes 0 to 4 into one film bag or double film bag.

[0019] Fragment size classes 0-4 (CS0-CS4) are defined based on the particle size of the fragments, which is defined as the longest distance between two points on the surface of the silicon piece. The fragment size classes group fragments with the following particle size ranges: CS0: 0.1 to 9 mm CS1: 1~18mm CS2: 5~50mm CS3: 20~65mm CS4: 35-150mm

[0020] The silicon pieces can be classified using a mesh screen, the side length of which corresponds to the upper limit of one CS. For example, DE 102013218003 A1 describes a classification method using a vibrating screen, and DE 102006016324 A1 discloses an optical / pneumatic classification method.

[0021] A single CS preferably contains at least 90% by weight of silicon pieces within each size range.

[0022] Compared to existing packaging for silicon, the transport container has been found to be able to significantly increase the amount of silicon transported per unit volume without generating fines or perforations. In particular, it can increase the allowable load capacity of ISO containers, resulting in a significant reduction in transportation costs. The benefits are summarized as follows: Improved quality of silicone after transport: Limited movement of silicone within the bag and within the transport container reduces fines and punctures. Increased load capacity: For example, loading a 20-foot ISO container with the shipping container of the present invention results in an increase in load capacity of up to 25%. Fewer logistics steps are required. This reduction is due in particular to the reduced number of transport containers that need to be loaded compared to existing transport. Reduce packaging material per kilogram of silicon shipped. Improve the operational reliability of automated loading operations. Fewer containers must be handled, potentially reducing error rates by 10-25%.

[0023] For transporting CS0 silicon pieces, film bags are used with a weight of 0.9 to 1.34 kg / dm 3 , preferably 1.01 to 1.23 kg / dm 3 When a double film bag is used instead of a film bag, the double film bag has a packing density of 0.68 to 1.02 kg / dm 3 , preferably 0.77 to 0.94 kg / dm 3 It has a packing density of

[0024] According to another preferred embodiment, the silicon pieces are of CS1. In this case, the film bags have a weight of 0.88 to 1.32 kg / dm 3 , preferably 0.99 to 1.21 kg / dm 3 The double film bag has a packing density of 0.68~1.03kg / dm 3 , preferably 0.77 to 0.94 kg / dm 3 It has a packing density of

[0025] The silicon pieces may also be CS2 pieces transported in a transport container. In this case, the film bags each have a weight of 1.07 to 1.61 kg / dm 3 , preferably 1.20 to 1.47 kg / dm 3 The double film bag has a packing density of 0.76~1.15kg / dm 3 , preferably 0.86 to 1.05 kg / dm 3 It has a packing density of

[0026] Another preferred embodiment relates to a shipping container with CS3 silicon pieces. In this case, the film bags each have a weight of 0.96 to 1.44 kg / dm 3 , preferably 1.08 to 1.32 kg / dm 3 The double film bag has a packing density of 0.75 to 1.13 kg / dm 3 , preferably 0.85 to 1.03 kg / dm 3 It has a packing density of

[0027] Furthermore, the silicon pieces may be CS4. Here, the film bags each have a strength of 1.05 to 1.58 kg / dm 3 , preferably 1.18 to 1.45 kg / dm 3 The double film bag has a packing density of 0.73 to 1.09 kg / dm 3 , preferably 0.82 to 1 kg / dm 3 It has a packing density of

[0028] The film bag or double film bag preferably includes a flat film bag (flat single bag) or a flat double film bag. Hereinafter, the term "flat bag" is used for both the flat film bag (flat single bag) and the flat double film bag. The flat bag preferably has an internal weight of 10 kg.

[0029] Flat bags generally have no bottom and therefore lack stability when standing up. The category of flat bags also includes tubular bags, which can be made from film tubes or film webs. Flat bags are typically characterized by a bag length and width in a filled state that are at least twice as large as the bag height.

[0030] The transport container preferably contains 8 to 14, more preferably 10 to 14, and more especially 11 to 13 flat single bags.

[0031] The transport container preferably contains 8 to 12, more preferably 9 to 11, and more particularly 9 flat double film bags.

[0032] The transport container preferably has a length L corresponding to the sum of the length l and width b of the flat bag. The width B of the transport container preferably corresponds to twice the width 2b of the flat bag, with 2b being at least equal to l. The height H of the transport container preferably corresponds to N x h, where h corresponds to the height of the filled flat bag and N corresponds to the number of layers of flat bags arranged on top of each other in the transport container. Here, it may be necessary to take into account the wall thickness of the transport container. Typical wall thicknesses are in the range of 4 to 20 mm, preferably 7 to 15 mm.

[0033] The length of the flat bag is, in principle, related to the flat bag in the filled state. The length of the transport container is related to its outer dimensions.

[0034] A typical length L of the transport container is, for example, in the range of 70-80 cm. In particular, L may be about 76 cm, which corresponds to the width of a typical chemical pallet (CP5). A typical width B is, for example, in the range of 50-60 cm. More particularly, B may be about 57 cm, which corresponds to half the width of a CP5. A typical height H of the transport container is, for example, in the range of 20-40 cm, depending on the number of layers of flat bags it contains.

[0035] A typical flat bag may have a length l in the range of 30 to 70 cm, a width b in the range of 10 to 45 cm, and a height h in the range of 6 to 20 cm.

[0036] In the filled state, a 10 kg flat bag preferably has a length l of 40 to 65 cm, a width b of 25 to 30 cm, and a height h of 7 to 12 cm.

[0037] One layer N in the transport container is preferably formed by at least 2 but not more than 4 flat bags. As far as the layer patterns described below are concerned, it is immaterial whether the bags are flat film bags or flat double film bags.

[0038] In the case of a layer of two flat bags (2N), the flat bags are arranged either vertically or horizontally (see Figure 1). The 2N layer is preferably used as the top layer when the layer below it has two or more flat bags.

[0039] In the case of a layer of three flat bags (3N), these flat bags are placed adjacent to each other, two of the flat bags being arranged lengthwise and one being arranged widthwise (see FIG. 2).

[0040] In the case of a layer (4N) of four flat bags, two flat bags are disposed adjacent to each other in the longitudinal direction, and two flat bags are preferably disposed overlapping each other in the longitudinal direction (see FIG. 3).

[0041] If the shipping container is loaded with eight 10 kg flat bags, it preferably has three layers in a layer arrangement of 3N, 3N, 2N, with the first layer always being the bottom layer and located at the bottom of the shipping container.

[0042] For a load of nine 10 kg flat bags, the transport container preferably has a layer arrangement 3N, 3N, 3N (see FIG. 4).

[0043] For a load of 10 flat bags of 10 kg each, the transport container preferably has a layer arrangement of 4N, 3N, 3N.

[0044] For a load of 11 10 kg flat bags, the shipping container preferably has a layer arrangement of 4N, 4N, 3N.

[0045] For a load with 12 flat bags of 10 kg, the transport container preferably has the layer sequence 3N, 3N, 3N, 3N.

[0046] For a load with 13 10 kg flat bags, the shipping container preferably has the layer sequence 4N, 3N, 3N, 3N.

[0047] For a load with 14 10 kg flat bags, the shipping container preferably has a layer sequence of 4N, 4N, 3N, 3N.

[0048] In the case of the layer arrangement 3N, 3N, preferably one layer is arranged rotated 180° relative to the other layer about an axis of rotation running perpendicular to the layer plane (see FIG. 4).

[0049] In particular, the height of a shipping container containing 8 to 13 10 kg flat bags is 30.9 to 33.4 cm. This type of height has been found to allow optimal loading of 20-foot and 40-foot ISO containers.

[0050] According to another alternative embodiment, the film bag or double film bag is an upright bag, more particularly an upright bag with a contents weight of 5 kg. Hereinafter, the term "upright bag" is used for both upright film bags (upright single film bags) and upright double film bags.

[0051] A stand-up pouch is generally characterized by its stability after filling. The stand-up pouch preferably has a square stand-up surface.

[0052] The shipping container preferably contains 6 to 27, more preferably 9 to 18 stand-up pouches.

[0053] A typical length L of a transport container for stand-up bags is, for example, in the range of 50-60 cm. More specifically, L can be about 57 cm, which corresponds to half the width of a typical chemical pallet (CP3). A typical width B is, for example, in the range of 35-60 cm. More specifically, B can be about 38 cm or 57 cm, which correspond to one-third or one-half the width of a CP3, respectively. A typical height H of the transport container is, for example, in the range of 18 to 35 cm, depending on the number of layers of stand-up bags it contains.

[0054] A typical upright pouch may have a length l in the range of 10-20 cm, a width b in the range of 10-20 cm, and a height h in the range of 10-25 cm.

[0055] In the filled state, a 5 kg stand-up bag preferably has a length l of 16 to 19 cm, a width b of 16 to 19 cm, and a height h of 14 to 24 cm.

[0056] Each layer in the transport container is preferably formed by six or nine upright bags with square upright faces, and the layers are preferably arranged flush with one another.

[0057] More specifically, the height of the containers containing 5 kg stand-up bags is 30.9-33.4 cm for three containers stacked per pallet, 23.2-25.1 cm for four containers stacked per pallet, and 18.5-20 cm for five containers stacked per pallet. These heights have been found to allow optimal loading of 20-foot and 40-foot ISO containers.

[0058] Generally, insert sheets of paper or card can be placed between layers or pouches (whether they are flat or stand-up pouches). Such insert sheets may be constructed of plastics such as polyurethane, polyester, or polystyrene.

[0059] Any remaining volume in the transport container can be filled with cushioning elements, such as polyurethane, polyester, or expandable polystyrene foam or shaped elements, or with paper, cardboard, or other materials.

[0060] A further aspect of the present invention relates to the pallet on which the described shipping containers are placed.

[0061] The pallets may in particular constitute standardized chemical pallets (CP), more particularly pallets selected from the group consisting of CP1 (dimensions: 100 x 120 cm), CP2 (80 x 120 cm), CP3 (114 x 114 cm), CP4 (110 x 130 cm) and CP5 (76 x 114 cm). CP1 to CP5 may also be called runner pallets. The pallets used are preferably CP3 or CP5, which are particularly suited for transporting ISO containers.

[0062] ISO containers (ocean cargo containers) are large, standardized containers for the rapid and easy loading, transport, storage, and unloading of cargo. Their dimensions are selected to facilitate transportation over land (road, rail, and inland waterways). Typical ISO containers are 8 feet (2.438 m) wide and 20 feet (6.096 m) or 40 feet (12.192 m) long.

[0063] It was found that the shipping container not only allows for the greatest possible space utilization in palletizing CPs, especially CP3 and CP5, but also, relatedly, ensures optimal space utilization in palletized 20-foot and 40-foot ISO containers.

[0064] The stacking of shipping containers on a pallet can be in the form of rows or stacks.

[0065] Additionally, the present invention also encompasses shipping containers, more particularly cargo containers comprising the above-described pallets loaded with CP3 and / or CP5 pallets, more particularly 20-foot or 40-foot ISO containers.

[0066] FIG. 1 shows a top view of two layers of flat bags 1 in a shipping container 2. The shipping container 2 has a length L that is approximately equal to the sum of the length l and width b of the flat bags 1. The width B is approximately equal to twice the width b of the flat bags 1. In general, the longitudinal dimensions B and L of the shipping container 2 can be selected to be approximately 0 to 10% larger than necessary relative to the longitudinal dimensions b and l of the flat bags 1. The flat bags 1 can be arranged so that their longitudinal sides are parallel to the longitudinal sides or parallel to the lateral sides of the shipping container 2.

[0067] Figure 2 shows a layer of three flat bags 1 in a shipping container 2. The flat bags 2 are arranged adjacent to each other and do not overlap. For the dimensions of the flat bags 1 and the shipping container, reference can be made to the description of Figure 1.

[0068] 3 shows a layer of four flat bags 1 in a shipping container 2. In this embodiment, sets of flat bags 1 overlap each other. In this case, preferably, the silicon pieces are not distributed evenly. Instead, the silicon pieces are primarily located in the non-overlapping parts of the flat bags 1.

[0069] Figure 4 shows a shipping container 2 containing nine 10 kg flat bags 1. The bags 1 are arranged in three layers. The layers are rotated 180° relative to each other so that only the top and bottom layers coincide. The dimensions of the bags 1 are l = 46.5 cm, b = 27.5 cm, and h = 9.8 cm. The height of the shipping container 2 is approximately three times the height of the flat bags 1, or H = 32.4 cm. The length of the shipping container is 76 cm, which corresponds to the width of the CP5. The width of the shipping container is 57 cm, which corresponds to half the length of the CP5.

[0070] In principle, the various layer patterns according to Figures 1 to 3 can be combined with one another in any way.

[0071] Figure 5 shows a shipping container 4 containing six 5 kg upright bags 3 with square upright sides arranged in one layer. The side lengths l and b of the upright bags 3 are 18.2 cm, and the height h is 22.3 cm. The dimensions of the shipping container 4 are H = 24.3 cm, L = 57 cm, and B = 38 cm.

[0072] FIG. 6 shows a shipping container 4 in which nine 5 kg stand-up bags 3 with square upstanding sides are arranged in one layer.

[0073] Figure 7 shows a shipping container 4 containing twelve 5 kg stand-up bags 3 with square upstanding surfaces arranged in two layers, one on top of the other. The side lengths l and b of the stand-up bags 3 are 18.2 cm, and the height h is 15.2 cm. The dimensions of the shipping container 4 are H = 32.4 cm, L = 57 cm, and B = 38 cm.

[0074] Figure 8 shows a shipping container 4 containing 18 5 kg stand-up bags 3 with square upright sides arranged in two layers. The side lengths l and b of the stand-up bags 3 are 18.5 cm, and the height h is 15.2 cm. The dimensions of the shipping container 4 are H = 32.4 cm, L = 57 cm, and B = 57 cm.

[0075] 9 to 14 will be elucidated with reference to examples. [Example]

[0076] 1. Pallet (CP5) with a load capacity of 540 kg (Figure 9) The shipping container is filled with 10 kg of CS3 polysilicon pieces, with a packing density of 0.94 kg / dm 3 The package contains nine double-layered film bags (flat bags) of the same material. The bags are arranged in three layers as shown in Figure 4. The dimensions of the bags and the shipping container can be seen from the description in Figure 4. The packing density of the shipping container is 0.75 kg / dm 3 In this way, six transport containers can be placed in a CP5. Thirty of these CP5s can fit into a 20-foot ISO container, giving a net payload of 16.2 tonnes. Existing transport containers can only achieve a payload of 14.4 tonnes (see WO2015 / 007490A1).

[0077] 2. Pallet with a load capacity of 600 kg (CP5) The shipping container is filled with 10 kg of CS2 polysilicon pieces, with a packing density of 0.96 kg / dm 3 The container contains 10 flat double-layered film bags. For dimensions, please refer to the first example. The packing density of the transport container is 0.84 kg / dm 3 The bags are arranged in three layers, with the bottom layer consisting of four bags (see Figure 3). The CP5 can be loaded so that 30 pallets fit into a 20-foot ISO container, as shown in Figure 9. This corresponds to a net load weight of 18 t. Existing shipping containers could only achieve a load weight of 14.4 t (see WO 2015 / 007490A1).

[0078] 3. Pallet with a load capacity of 720 kg (CP5) The shipping container is filled with 10 kg of CS2 polysilicon pieces, with a packing density of 1.34 kg / dm 3 The container contains 12 flat film bags of this size. For dimensions, please refer to the first embodiment. The bags are arranged in four layers of three bags each, as shown in Figure 4, with successive layers rotated relative to each other. The packing density of the shipping container is 1.00 kg / dm 3 As shown in Figure 9, CP5 is loaded so that 30 pallets fit into a 20-foot ISO container, which corresponds to a net load weight of 21.6 tons. If an HT container (a hard-top container with increased load capacity) is used, 30 pallets (net load weight: 21.6 tons) can be loaded.

[0079] 4. Pallet with a load capacity of 480 kg (CP5) The shipping container is filled with 10 kg of CS4 polysilicon pieces, with a packing density of 0.91 kg / dm 3 The container contains eight flat double-layered film bags. For dimensions, refer to Example 1. The packing density of the transport container is 0.67 kg / dm 3The bags are arranged in three layers. The bottom two layers consist of three double bags (see Figure 2), and the top layer consists of two bags (see Figure 1). CP5 is loaded into a 20-foot ISO container, as shown in Figure 9, so that 30 pallets fit into the container, giving a net load weight of 14.4 tons.

[0080] These examples clearly show that the new packaging method makes it possible to significantly increase the load weight of pallets and therefore ISO containers. As a result, the number of transportation and logistics steps per kg of silicon can be reduced throughout the entire product lifecycle (from production to processing and disposal of packaging materials). Furthermore, by changing the load capacity of the shipping container, the packaging size can be flexibly adjusted.

[0081] 5. Pallet with a load capacity of 720 kg (CP3) (Figure 10) The shipping container is filled with 5 kg of CS4 polysilicon pieces, with a packing density of 0.80 kg / dm 3 The bag has a square upright surface and is arranged in a single layer. For dimensions, see Figure 5. The shipping container has a capacity of 0.65 kg / dm² each. 3 In this way, 24 shipping containers can be placed on the CP3 (combined stacking). 20 of these CP3s fit into a 20-foot ISO container, giving a net load weight of 14.4 t.

[0082] 6. Pallet with a load capacity of 720 kg (CP3) (Figure 11) The shipping container is filled with 5 kg of CS3 polysilicon pieces, with a packing density of 0.85 kg / dm 3 The box contains nine standing film bags of this size. The side lengths l and b of the standing bags are 18.7 cm, and the height h is 22.3 cm. The dimensions of the shipping container are H=24.3 cm, L=57 cm, and B=57 cm. The bags are arranged in a single layer. The packing density of the shipping container is 0.64 kg / dm 3 CP3 is loaded with 16 shipping containers. Thus, 20 pallets fit into a 20-foot ISO container, equivalent to a net load weight of 14.4 tonnes.

[0083] 7. Pallet with a load capacity of 1080 kg (CP3) (Figure 12) The shipping container is filled with 5 kg of CS2 polysilicon pieces, with a packing density of 0.96 kg / dm 3 The container contains 12 standing film bags of 120 ... 3 CP3 loads 18 shipping containers as shown in Figure 12. 20 pallets fit into a 20-foot ISO container, which equates to a net load weight of 21.6 t. For a 20-foot standard ISO container with a maximum load weight of 21.67 t, 18 pallets are sufficient to utilize this load weight, including packaging. This equates to a net load weight of 19.44 t. If an HT container is used, it is possible to load 20 pallets (net load weight: 21.6 t).

[0084] 8. Pallet with a load capacity of 1080 kg (CP3) (Figure 13) The shipping container is filled with 5 kg of CS3 polysilicon pieces, with a packing density of 0.95 kg / dm 3 The bag is arranged in two layers of nine bags each (see Figure 8). The dimensions can be seen in Figure 8. The packing density of the shipping container is 0.94 kg / dm 3 CP3 loads 12 shipping containers as shown in Figure 13. 20 pallets fit into a 20-foot ISO container, which equates to a net load weight of 21.6 t. For a 20-foot standard ISO container with a maximum load weight of 21.67 t, 18 pallets are sufficient to utilize this load weight, including packaging. This equates to a net load weight of 19.44 t. If an HT container is used, it is possible to load 20 pallets (net load weight: 21.6 t).

[0085] 9. Pallet with a load capacity of 900 kg (CP3) (Figure 14) The shipping container is filled with 5 kg of CS2 polysilicon pieces, with a packing density of 0.90 kg / dm 3The box contains nine standing film bags of this size. The bags are arranged in a single layer. The side lengths l and b of the standing bags are 18.7 cm, and the height h is 17.4 cm. The dimensions of the shipping container are H=19.4 cm, L=57 cm, and B=57 cm. The packing density of each shipping container is 0.82 kg / dm 3 CP3 is loaded with 20 shipping containers. Thus, 20 pallets fit into a 20-foot ISO container, equivalent to a net load weight of 18.0 t.

[0086] Determination of fine powder ratio This determination was made by simulating a typical transport on a truck bed over a distance of 800 km, subject to transport vibrations. Shocks during transport, especially horizontal shocks during pallet and / or shipping container exchanges, can be equivalent to two to three times the acceleration due to gravity (g). The simulation was carried out using a vibration plate.

[0087] The CS2 polysilicon was transported in a 10 kg flat double film bag in a transport container, and then sieved with a 2.0 mm mesh screen to check the fine powder content.

[0088] Comparison transport container 1 (comparison TC1) Eight 10 kg flat double-layered bags of transport packaging (see WO2015 / 007490A1) arranged horizontally in four layers of two bags each. Six of these transport packages are arranged in one CP5 (480 kg). Dimensions of transport packaging: 740 x 550 x 280 mm (L x W x H). Dimensions of double-layered bags: 620 x 410 mm.

[0089] Transport container 2 (TC2) was loaded onto a pallet (CP5, 540 kg) according to Example 1 and FIG. 9).

[0090] Transport container 3 (TC3) was loaded onto a pallet (CP5, 540 kg) according to Example 4).

[0091] Table 1 shows the packing density, fine powder percentage, and perforations of the flat double film bags for each of the five transport containers investigated (Tests 1 to 5). In each test, 960 kg of polysilicon (CS2) was evaluated for comparison. 1080 kg was evaluated for TC1, TC2, and TC3. Perforations (perforation rate) refer to perforations in the outer bag. The fine powder percentages of TC2 and TC3 were significantly lower than that of the comparison TC1. Perforations were at a very low level, with no significant difference.

[0092] [Table 1]

Claims

1. A transport container containing 8 to 14 flat film bags or 8 to 12 flat double film bags filled with silicon pieces, each of which has a capacity of 0.88 to 1.62 kg / dm ３ and the flat double film bag has a packing density of 0.68 to 1.15 kg / dm ３ and the transport container containing the flat film bag has a packing density of 0.81 to 1.23 kg / dm ３ and the transport container containing the flat double film bag has a packing density of 0.65 to 1.06 kg / dm ３ and having a packing density of However, the packing density of the flat film bag or the flat double film bag is equal to or greater than the packing density of the transport container, and the silicon pieces belong to at least one of fragment size classes 0, 1, 2, 3, or 4; The transport container has a length L corresponding to the sum of the length l and width b of the flat bag, and a width B corresponding to double the width 2b, where 2b is at least equal to l, and 2 to 4 flat bags form a layer N within the transport container, In the case of a layer of two flat bags 2N, the bags are arranged side by side in the longitudinal or transverse direction, In the case of a layer of three flat bags 3N, the bags are arranged next to each other, two of the bags are arranged lengthwise and one is arranged widthwise, In the case of a layer of four flat bags 4N, two bags are arranged side by side in the vertical direction, and two bags are arranged overlapping each other in the vertical direction. The container When eight flat bags are loaded, the layer arrangement is 3N, 3N, 2N, When nine flat bags are loaded, the layer arrangement is 3N, 3N, 3N, When 10 flat bags are loaded, the layer arrangement is 4N, 3N, 3N, When 11 flat bags are loaded, the layer arrangement is 4N, 4N, 3N, When 12 flat bags are loaded, the layer arrangement is 4N, 4N, 4N or 3N, 3N, 3N, 3N, When 13 flat bags are loaded, the layer arrangement is 4N, 3N, 3N, 3N, When 14 flat bags are loaded, the layer arrangement is 4N, 4N, 3N, 3N, The first layer corresponds to the bottom layer, the transport container.

2. The flat film bag has a mass of 0.99 to 1.49 kg / dm ３ and the flat double film bag has a packing density of 0.77 to 1.05 kg / dm ３ 10. The shipping container of claim 1 having a packing density of

3. The transport container containing the flat film bag has a capacity of 0.89 to 1.14 kg / dm ３ and the transport container including the flat double film bag has a packing density of 0.73 to 0.97 kg / dm ３ 3. The shipping container of claim 1 or 2, having a packing density of

4. 2. The transport container of claim 1, wherein the silicon pieces are of fragment size class 0, the flat film bags each have a packing density of 0.9 to 1.34 kg / dm3, and the flat double film bags each have a packing density of 0.68 to 1.02 kg / dm3.

5. 2. The transport container of claim 1, wherein the silicon pieces are of fragment size class 1, the flat film bags each have a packing density of 0.88 to 1.32 kg / dm3, and the flat double film bags each have a packing density of 0.68 to 1.03 kg / dm3.

6. 2. The transport container of claim 1, wherein the silicon pieces are of fragment size class 2, the flat film bags each have a packing density of 1.07 to 1.61 kg / dm3, and the flat double film bags each have a packing density of 0.76 to 1.15 kg / dm3.

7. 2. The transport container of claim 1, wherein the silicon pieces are of fragment size class 3, the flat film bags each have a packing density of 0.96 to 1.44 kg / dm3, and the flat double film bags each have a packing density of 0.75 to 1.13 kg / dm3.

8. 3. The transport container according to claim 1 or 2, wherein the silicon pieces are of fragment size class 4, the flat film bags each have a packing density of 1.05 to 1.58 kg / dm3, and the flat double film bags each have a packing density of 0.73 to 1.09 kg / dm3.

9. The transport container according to any one of claims 1 to 8, wherein the weight of the contents of the flat film bag or the flat double film bag is 10 kg.

10. The shipping container according to any one of claims 1 to 9, comprising 10 to 14 flat film bags.

11. The transport container according to any one of claims 1 to 10, comprising 9 to 11 flat double film bags.

12. A pallet on which the transport container according to any one of claims 1 to 11 is placed.

13. A cargo container comprising the pallet of claim 12.

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