TW577850B - Box for carrying plate-shaped object, foam forming method and foam forming apparatus - Google Patents

Abstract

A box foam-formed with molds without or almost without draft for accommodating and carrying plate-shaped object, such as PDP substrate, a foam forming method and a foam forming apparatus for forming the foam-formed box are provided. The box comprises a main body A and a cover body B both are thermoplastic resin foamed bodies formed from thermoplastic resin foam beads. The main body A surfaces a plurality of grooves a for supporting the plate-shaped objects are formed. The groove is formed in a shape with 1/1000 to 5/1000 taper from its open side to its bottom 61 side. In the foam forming method, middle molds 20, 20 contacting with a core mold 10 and forming drafts with the core mold 10 are first provided on at least one pair of side surfaces 11, 11 in the opposing surfaces of the core mold 10, and after a foamed body A is formed the middle molds 20, 20 are forced to move a short distance along the drafts between the middle molds 20, 20 and two side surfaces of the core mold 10 under the condition that the foamed body A and a cavity mold 30 will not separate, and after that the foamed body A together with the cavity mold 30 are pulled out of the core mold 10 while the middle mold 20 is prohibited from moving and finally finished the mold release.

Description

577850 V. Description of the invention (1) [Detailed description] [Technical field to which the invention belongs] The present invention relates to a box for transporting a plate-shaped body, in detail, a box for transporting a plate for stably storing a plasma dlsplay and the like. A foam molding method and a foam molding apparatus for a box for transporting a plate-shaped body. & ^ π / [Problems to be Solved by Conventional Technology and Inventions] A transport box for a plate-shaped body that can be stored in a groove and transported with a substrate having a high-precision electropolymer display, etc., is disclosed in Gazette No. 2552625 Proposal. This type of transport box is made of synthetic resin foam, and a group of inner sides facing each other on the inner side of the box forms a plasma display substrate (PDP substrate) and the like is stored in a vertical groove. . If this medium-sized box is very shallow, there is no problem, but when a deep box with a large pDp substrate is used, due to the draft of the draft during forming, a large dimensional difference occurs above and below the groove. Therefore, it is not easy to stably store the pDp substrate, and the PDP substrate becomes uneven during transportation, so that the groove at the bottom = narrower place, only the lower part of the PDP substrate contacts the wall of the groove, so that the contact area is concentrated locally. It may cause damage, adhere to dust, or rub powder on the molded articles of resin beads to produce a powder, which adversely affects the PDP substrate. θ Therefore, it is required that there is no draft slope, or the draft slope is reduced as much as possible. The foam molding of the mesh does not meet this requirement. Therefore, the present invention provides & conveyance of foamed molded products suitable for accommodating a plate-like body such as a PDP substrate without or without the draft angle as described above.

577850 V. Description of the invention (2) Use the box for the purpose. Furthermore, the present invention aims to provide a foam molding method and a foam molding apparatus for manufacturing a foam molded product suitable for accommodating a plate-shaped body such as a pDp substrate without or without the draft angle as described above. [Means for solving the problem] ^ The present invention is a box for transporting a plate-like body for solving the above-mentioned problems. As described in item 1 of the scope of the patent of Shengu, the thermoplastic resin is molded from the foamed particles of the thermoplastic resin and f A transport box consisting of the body of the foam system and the cover. The main body has a depth of more than 400 mm, and a plurality of grooves for supporting the plate-like body are formed in the upside-down direction of the inner surface side of the inner surface side. This groove system is characterized in that a tapered shape is formed from the wide open side to the slightly narrow bottom side. Here, the so-called slope of 1/1000 to 5/1000 is a ratio of 1 to 5 mm inclined to the outside of the body in the horizontal direction with respect to the body's vertical direction of 1,000 mm. In other words, if the angle between the groove and the vertical line is Θ, then 1/1 0 0 0 $ tan 0 $ 5/1000 compared with the former molded product is roughly 1 0/1 0 0 0 $ tan 0 $ 2 0/1 0 0 0 range. The preferred tan0 range of the present invention is i / iooo to 3/1000. In this way, a groove having a very small slope of 1/1000 to 5/1000 is formed on the inner side of the main body having a depth of 400 mm or more, so there is almost no difference in size between the upper and lower grooves. The plate-shaped body is neatly and stably stored and held. Especially as described in item 2 of the scope of patent application for the present invention,

313745.ptd Page 9 577850 V. Description of the invention 1. The state of the invention is slightly shifted inward, so that there will be a gap between the foamed molded product and the master mold and the intermediate mold outside the public right (small clearance ) 'After the intermediate mold is stopped, the foamed molded product can be easily demolded with the female mold away from the side of the male mold. The demolding is performed in this way', that is, the scope of patent application No. 4 as attached to the scope of patent application No. 4 According to item 5, the intermediate mold and the foamed molded product can be formed without draft angle, or almost without draft angle, and provide at least one of the box-shaped foamed molded products obtained by demolding from the master mold. There is no taper on the inner side of the group or there is no groove suitable for receiving the plate-shaped body.

In addition, if the restriction on the movement of the intermediate mold is described in item ^ of the patent application scope item ^ attached to item 4 or 5 of the patent application scope, when the cylinder mechanism connected to the male mold side is implemented, the middle mold can be moved correctly limit. In addition, as described in item 7 of the scope of patent application attached to any of the scope of patent applications 4 to 6, the outer side surface of the group 丨 facing the middle mold is used to form the Comb teeth, forming grooves on the inner side of a group of foamed molded products facing each other, can provide box-shaped foamed molded products with grooves for stably accommodating each plate-like body, and especially provide p D p substrates, etc. A storage box suitable for storage and transportation of Nan Precision Plates.

Secondly, the foam forming device for implementing the above-mentioned foaming molding method described in items 8 to 丨 丨 of the present invention, is suitable for appropriately and efficiently implementing the foaming described in items 4 to 7 of the above-mentioned patent application. Specific device for forming method. Also, depending on the invention in the patent application scope No. 12 of the patent application scope Nos. 8 to 11, the draft angle between the male model and the intermediate die is formed.

577850 V. Description of the invention (5) 2 30/1 000 to 70/1 000, because it is the draft angle of the part that does not have any effect on the inner side of the foamed molded product, it can be fully drawn. The slope of the draft of the XC male branch and the middle die is preferably 30/1000 to 50/1000. In addition, in the patent application scopes 13 and 13 which are attached to the patent application scopes 8 to 12, the draft angle between the outer side surface of the intermediate mold and the foamed molded product is formed from 1/1000 to 5/1. 〇〇. Therefore, it is possible to suppress the draft angle so that it does not affect the minute draft angle of the inner surface of the foamed molded product. [Embodiments of the present invention] Embodiments of the present invention will be described below with reference to the drawings. In the oblique view of Fig. 1, A is the main body and B is the cover. It is made of foamed pellets made of any thermoplastic resin raw material, preferably styrene-modified polyolefin foamed pellets. The above-mentioned body A has a depth of more than 400 mm, and a plurality of grooves a, a for supporting the plate-shaped body are formed on the inner surface of the opposite side of the inner surface of the group. This groove a is in the body A of the figure, although only the inner side of the visible side is not shown, in fact, the invisible inner side also forms the groove a. This point can be clearly understood from the cross-sectional view of the state where the lid body B is covered in FIG. 2. In the figure, reference numeral 50 denotes a support body having a groove 51 embedded in an elongated insertion portion 60 formed in the bottom 61 of the main body A, and the lower end of the plate-shaped body accommodated in the groove 51 can be partially supported by the groove 51. The groove 8 can be used to support a support having a groove 8 in an elongated insertion portion 70 formed on the inner surface 71 side of the cover B. Suddenly support the upper end of the plate-shaped body p. In practice, although the support body 50 or the support body 80 may not be used, grooves may be formed directly at the bottom 61 of the body A or the inner surface 71 of the cover body B, but the support body 50 or the support body 80 having the grooves is formed. Formed separately from the main body A or the cover body B, making it easy to perform the molding operation, and the mold is small

577850 V. Description of the invention (6) The method is advantageous in manufacturing cost. It can also be seen from the plan view of FIG. 3 that the groove a on the inner side of the main body A and the groove 51 of the t-bearing body 50 correspond as grooves for accommodating a plate-like body such as a PDP substrate. FIG. 4 shows that the plate-shaped body p is stored between the body a and the cover body B. The groove a for supporting the plate-shaped body formed on the inner side surface of the main body A is formed from a slightly wider opening side to a slightly narrower bottom side to form a slope of 1/1000 to 5/1000. There is almost no slope, and there is almost no dimensional difference between the top and bottom. The so-called 1/1000 to 5/1000 slope here refers to a ratio of 1 to 5 mm inclined to the outside of the body in the horizontal γ direction with respect to the body in a vertical X direction of 1000 mm. In other words, it means that, as shown in Fig. 11, when the angle formed by the groove a and the vertical line is 0, 1 / IOO00 $ tan0 $ 5/1000. Here, in one example of the present invention, tan 0 is 1.5 / 1 0 0 0. The cross section ^ of the convex portion 62 forming the rising portion on the left and right sides of the groove a is a trapezoid as shown in FIG. The bottom of this trapezoid is: top W2, when the height is Η, it is implemented in the following two ways (1) (2) " is (1) 1 · 5S W1 / W2S 2 · 5 (2) 3 $ If H / W2- 10 is less than 1.5, then the difference will be greater than 2 f sliding ~ · 'and worse. If it is less than 3, it must be full W2 = 6. 5 to 1 0 4 If ϊH / W2 is greater than 10, it is the same as the above, and the filling performance is poor. Less than 3 The rising part is too small to support the plate-like body. Therefore, ′ is the rising part of the two formulas (1) (2).

577850 V. Description of the invention (7) _, H = 25 to 30 dragons. W2 can also be in the range of W2 ^ 15. When it is less than 5, the pre-expanded particles as raw materials are prone to underfilling. When it is greater than 15, the thickness of the rising part is increased, and the transportation efficiency of the plate-shaped body is reduced. In addition, W1 can also be in the range of W1 ^ 20, and when it is less than 9, the pre-expanded particles used as raw materials are liable to cause filling failure, and when it is greater than 20, the transport efficiency of the plate-shaped body is reduced. In addition, it is also possible to use raw materials of 20 ^ 40! When it is less than 20, it cannot support the plate-like body, and when it is greater than 40, the pre-expanded particles as the original material are prone to occur #Press τ A ^ > M Α is really bad. The relationship between the thickness t of the smallest wide part of the groove a and the t-shaped body is preferably that when W3 $ 2t is less than t, the plate-shaped body cannot be inserted. If it is greater than 21, the shaking in Zhao 柘 # _ + is more intense and unstable. If it is larger than 2t, the plate-shaped body in the groove a is compared with the size shrinkage ratio of the previous body. The polypropylene resin particles disclosed are: the full force is small, it is difficult to charge, and the dimensional accuracy of the private molded product is poor. Disadvantages such as secondary foaming, etc. The present invention makes it necessary to use a special filling method with the same expansion ratio as the foaming ratio. . In addition, it is used with the present invention-it is easy to produce powder due to friction. The monomer is impregnated and polymerized into j :: j :::: resin 'system, which is obtained by making styrene-based tellurium ytterbium tree particles. Implementation, use it

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The polyolefin of the resin is polyethylene. For the foam molding using the above-mentioned foamed particles, the following steps are required: (1) Impregnating the foaming agent into a stupid ethylene modified polyolefin resin in a dry or wet manner to form a foamable styrene modified polyolefin. Department of resin. (2) The foamable styrene-modified polyolefin resin is pre-foamed. (3) A molding die is filled with the pre-expanded foamed styrene-modified polyolefin resin and molded. /

The foamed pellets of the thermoplastic resin used as the raw material are preferably styrene-modified polyolefin resin foamed pellets having a foaming ratio of 5 to 20 times (trade name pi of Sekisui Chemical Industry Co., Ltd.). celan. Among them, it is particularly preferable that the foaming ratio and particle size of 2.3 to 3mm0 particles with 80% or more at a foaming ratio of about 1 & times. The size of the body A has various implementation possibilities. The long side 1 300mm X the short side 974mm X depth 570ππη are exemplified. The implementation state of the box for transporting the plate-shaped body of the present invention is illustrated below with reference to the drawings.

Figures 6 to 9 are plan views showing the demolding process of the foaming molding method in sequence, which is a cross-sectional view. The figure shows the fixing plate, 10 is a male mold, 20, 20 is an intermediate mold, 30 is a cavity mold, and the a-series is a box foam molded product. The relationship between the male model 10, the middle model 20, and the mother-in-law 30 is explained below. The at least i opposite to the above-mentioned male mold 10 and the male mold 10 form a draft angle with each other. The two sides 11, 1 of the group are provided with intermediate molds 2 0, 2 0 which can be connected to each other.

313745.ptd Page 15 V. Description of the Invention (9) The structure is such that the draft angle is not formed between the intermediate mold 20 and the foamed molded product A. The technical mold inclination is almost the same. The former male mold 10 and the intermediate mold 20 are usually formed by the draft angle of the forming mold.帛 Slope, can be connected

^ Let the intermediate mold 2 〇, when forming the foamed product A f + (A · ^ A ϊ degree to the degree of dynamic IT " 'the range of its movement is limited'-Cheng Yi c: u: d :; ^ 4r ^ ^ ^ ι〇--— ^ :: bubble = set the mold to close the mold and make the thermoplastic material etched inside the cavity, and heat the tree particles with a heating medium such as steam to melt it to make the foamed molded product A die cavity. After the shape is formed, it will enter the demolding process, and the demoulding will be performed in the following order. As for the filling of the above raw materials and the supply mechanism of the heating medium such as steam, it is the same as that of ordinary foam molding, so its illustration is omitted. ) First from the state of FIG. 6, with the intermediate mold 20 and the foamed molded product A and the mother mold 30 still together, make the intermediate mold 20 along the draft angle with the male mold 10, such as As shown in Fig. 7, after slightly moving (approximately 100 mm) and then stopping, the middle die 20 will move slightly in the direction Y perpendicular to the moving direction X along with the movement of the draft slope, and will move with the foamed molded product. A slight clearance (A) is generated between A. (2) Secondly, using the aforementioned small clearance, the intermediate mode 2 0 'from the stopped state is used The mother mold 30 of the foamed molded product a is still moved together as shown in FIG. 8, and as shown in FIG. 9, it is completely separated from the male mold 10 side having the intermediate mold 20. Then, The intermediate mold 20 is fixed by the cylinder mechanism 40.

313745.ptd Page 16 577850 V. Description of the invention (10) The direction Z of the fixed plate 1 moves back to its original position before demolding, in order to wait for the next molding cycle. (3) Secondly, "the foamed molded product a which moves together with the master mold 30 is separated from the master mold 30. As described above," a predetermined small distance between the draft angle and the male mold 10 has a draft angle. The intermediate mold 20 is separated from the foamed molded product A and the master mold 30 which are still together, so that the subsequent master mold 30 with the foamed molded product a can be demolded. Ejection of the intermediate mold 20 becomes easy. The inner side surface of the foamed molded product A does not require more draft angle than before, and therefore, it can be formed without draft angle, or with almost no draft angle. In the case of draft slope, the optimum range of the value is a slope of 1/1000 to 5/1000. / The so-called inclination of 1/1 0 0 0 to 5 / 丨 〇〇〇 here refers to the vertical X direction 1 q 〇〇 ^ relative to the phase body foamed to open α mouth A The outside is tilted by a ratio of 1 to. In other words, the angle formed by the inclined surface on the outer side of the middle mold and the vertical line is 0 (that is, as shown in Figure U, the angle formed by the groove of the box body and the vertical line is 0), then 1 / 1000S tan < 9 S The range of 5/1000 stationery is 10/1 0 0 0 S tan Θ $ 20/1 〇〇〇. The optimal range of tan ~ in the present invention is 1/10000 to 3/10000. In this way, when the plate-shaped body is stored in the storage portion of the box made of foamed molded product, that is, there is no difference in size between the opening portion side and the bottom side, so that the plate-shaped body can be stably stored. .

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Page 17 577850 V. Description of the invention (11) --- In the present invention, a groove a for holding a substrate must be formed on the inner surface of the box of the foamed molded product to prevent the substrates from contacting each other. The groove forming mechanism in the above foamed molding device In the previous embodiment, as shown in FIG. 10 as viewed from the direction of the arrow v in FIG. 9, a comb along the demolding direction of the foamed molded product A is formed on the outer side of the group 1 opposite to the middle mold 20. Tooth 21 is used to form a groove a on the inner side surface of a group of foam moldings a facing each other using this intermediate die 20 having comb teeth 21. Also, although the other inner side surface of one group of inner side surfaces in Fig. 1 is not visible, a groove a is formed on the inner side surface that is not visible. B in FIG. 1 represents a cover. In practice, as shown in FIG. 12, in order to smoothly move the middle die 20 by the cylinder mechanism 40, it is preferable to provide a plurality of roller parts 1 2 ′ on the male die 1 0 side in the middle die 2 A hollow is formed on the inner side of the 〇, and a short ruled rail 22 (rai 1) on which the roller portion 12 can slide is provided on the inner side. Also, the 'cylinder mechanism 40 is provided at the position of the cut-out section 3 formed in the male mold 10'. One end penetrates the fixing plate 1 and is connected to the driving source on the outside. The other end is fixed by the holding part 23 of the intermediate mold 20. maintain. [Effects of the present invention] As described above, the box for transporting the plate-shaped object of the present invention minimizes the difference between the upper and lower dimensions of the groove for supporting the plate-shaped object, so that the plate-shaped object is a high-precision pDp substrate or other high-precision. The substrate can also be stably stored and protected when the substrate is transported and the stability of the board is improved, and the plate-shaped body can be efficiently stored, which is very advantageous in improving the transportation efficiency. Furthermore, the above-mentioned foaming molding method and foaming apparatus of the present invention can be formed on the inner side of a box opening > foamed molded product without the need for a draft angle, or with almost no draft angle. Therefore, it is possible to suppress

577850 V. Description of the invention (12) The difference in size makes it extremely small. In particular, in foam molding in which grooves are formed on the inner surface, dimensional differences between the upper and lower grooves can be suppressed as much as possible, so PDP substrates with high accuracy can be stably stored and supported to stabilize the conveyance.

313745.ptd Page 19 577850 Brief description of drawings [Simplified description of drawings] Figure 1 is a perspective view of a box-shaped foamed molded product in a state where a cover is opened. Fig. 2 is a cross-sectional view of the front side in a state where the lid body is covered. Fig. 3 is a plan view with a part omitted. Fig. 4 is a sectional view on the side. Fig. 5 is an enlarged plan view showing a groove portion of the body. Fig. 6 is a sectional view before demolding by foam molding. FIG. 7 is a cross-sectional view when the mold is released from the mold release range. Fig. 8 is a sectional view in the middle of demolding. Fig. 9 is a sectional view showing a state after demolding from the male mold side. Fig. 10 is a front view showing a male mode and an intermediate mode. FIG. 11 is a schematic cross-sectional view in which a part of the groove inclination is enlarged and displayed. Fig. 12 is a partially cutaway perspective view showing a sliding portion of the intermediate mold. [Symbol description] 1 Fixing plate 10 Male mold 11, 11 Both sides 12 Roller part 13 Cut-off part 20, 20 Intermediate mold 21 Comb teeth 22 Holder 23 Holding part 30 Female mold 40 Cylinder mechanism 50 Support body 51 Groove 60 > 70 Inward part 61 Bottom 71 Inner surface

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Claims (1)

577850 Case No. 91111652 Heart Year 丨 Revision j: --- VI. Application for patent scope 1 · A box for transporting a plate-shaped body, which is a thermoplastic resin foaming system formed from foamed pellets of thermoplastic resin The main body and cover are composed of a main body with a depth of 40 Omm or more, and at least one set of inner side faces of the inner side faces, a plurality of grooves for supporting plate-shaped bodies are formed in the vertical direction, and the grooves are slightly wider. From the open side to the slightly narrow bottom side, a slope of 1/1 0 0 to 5M 0 0 0 is formed. 2 · For the box for transporting a plate-shaped body as described in item 1 of the patent application, where the cross-sectional shape of the convex part on the left and right of the groove forming the groove is trapezoidal, the bottom of the trapezoid is W1, the top is W 2 ', and η , Satisfy the following (1) (2) two formulas (1) 1 · 5 $ W1 / W2S 2 · 5 (2) 3 $ H / W2 $ 10. 3. The box for transporting a plate-like body as described in item 1 or 2 of the scope of patent application, wherein the foamed particles of the thermoplastic resin are styrene-modified polyolefin resin foamed particles. 4 · A foam molding method is a foam molding method for forming a box-shaped foam molded product, which is provided on at least one side of a pair of male molds opposite to each other to form a draft angle with the male mold to form a draft angle with each other. Connected to the middle mold, and when it is demolded after molding, when the foamed molded product and the mother mold are still together, the middle mold is slightly moved along the draft angle between the middle mold and the male mold. When the intermediate mold stops moving, the foamed molded product is released from the male mold side along with the mother mold. 5. If the scope of the patent application is-^ ^ PX, 7T > / j and the foam molding product is formed without draft angle or love, the intermediate mold does not have draft angle 2003.06. 09. 022 577850 _ Case No. 91111652_ Amended in January 2011_ VI. Application for patent scope 6. For the foam molding method of the scope of patent application No. 4, wherein the movement restriction of the intermediate mold is made by the male mold The cylinder mechanism connected to the side mold is implemented. 7. For the foam molding method of any one of the items 4 to 6 of the scope of application for a patent, wherein a pair of outer surfaces of a pair of intermediate molds are used to form comb teeth along the demolding direction of the foam molded product, Grooves are formed on the inner side surfaces of the opposing groups of foamed molded products. 8. A foam forming device is a foam forming device for forming a box-shaped foam molded product, which is arranged on both sides of at least one group of male molds opposite to each other, and is arranged to form a draft slope with the male mold. The connected middle mold is configured to move the middle mold along the draft angle between the foam mold and the female mold while the foam mold is still with the mother mold when the mold is released after molding. And after the intermediate mold stops moving, the mother mold and the foamed molded product are separated from the male mold side and demolded. 9. The foam molding device according to item 8 of the patent application, wherein the outer side surface of the intermediate mold is formed in such a manner that there is no draft slope or almost no draft slope with respect to the foam molded product. 10. The foam forming device according to item 8 of the scope of the patent application, wherein a cylinder mechanism for moving and stopping the intermediate mold is provided on the male mold side. 1 1. The foam molding device according to any one of claims 8 to 10 in the scope of the patent application, wherein a group of outer surfaces facing each other of the intermediate mold are formed to form a groove on the inner surface of the foam molded product. Comb teeth in the die direction. 12. The foam forming device according to any one of items 8 to 10 in the scope of patent application, wherein the draft angle between the male mold and the intermediate mold is formed as 3 0/1 0 0 to 313745.ptc Page 2 2003. 06. 09. 023 577850 Amendment No. 91111652 6. Apply for a patent scope of 70/1000 ° 1 3. If you apply for a foam forming device in any of the patent scope 8 to 10, Among them, the draft angle between the outer surface of the middle mold and the foam molding is formed from 1/100 0 to 5/1000. 313745.ptc Page 3 2003. 06. 09. 024