JP3478912B2 - Feed block for end multi-row multi-layer sheet - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed block in a feed block type multilayer sheet forming apparatus, and more particularly to a feed block of a multilayer sheet main body formed from the forming apparatus. The present invention relates to a feed block for a multi-layer sheet capable of simultaneously forming a multi-row layer at an end in parallel. [0002] First, as described above, the present invention relates to a feed block type multilayer sheet forming apparatus. That is, this type of apparatus generally includes a plurality (five in the illustrated example) of melts 12 as shown in FIGS. 4A to 4C (see also FIGS. 5 and 6). ′, 14 ′, 16 ′, 18 ′ and 20 ′ are sequentially separated from the central layer (12 ′) to the outer layers (14 ′, 16 ′, 18 ′,
20 ′), the manifolds 12, 14, 16, 18, and 20 respectively expanding toward the downstream side to be merged in a stacked manner.
And a melt block 12 ′ to 20 ′ positioned downstream of the feed block 10.
From the manifold 32 and the slit 34 to form a multilayer sheet 40 by wide-width extrusion. [0003] As described above, this type of device is generally widely used because the entire device is relatively simple and small because the T-die is formed in a single layer type.
Here, the structure of the feed block itself according to the present invention, that is, the configuration in which a multi-row layer is simultaneously formed in parallel at the end of the multilayer sheet main body and the like will be sequentially described below. However, the conventional feed block for end multi-row multi-layer sheets (hereinafter sometimes simply referred to as a feed block device) is still improved as described below. Had difficulties to be done. That is, in the molding apparatus, the sheet 4
At 0 (see FIG. 4C), a predetermined length of the ear portion 44 is trimmed from the sheet body 42. However, the ear portion 44 is the same as the sheet body 42, but contains the reactive impurities of the melts 12 'to 20' of each layer, and is discarded without recycling for quality maintenance and the like. However, this disposal not only lowers the yield of the raw material of the melt, but also recently causes pollution problems, particularly as industrial waste. Therefore, in order to overcome the above-mentioned difficulties, a multi-row layer (additional layer made of a single melt) which does not contain the reactive impurities is attached to the end of the sheet body during recent sheet forming. Have been developed and applied (see FIGS. 5 and 6). That is, the above-described technique is applied to either a feed block or a T-die constituting a molding apparatus. First, in the configuration shown in FIG. Separate from the manifolds 12 to 20 for the supply of 20 ', the inlets 22, 24 for the supply of additional melts 22', 24 ', as indicated by dashed lines.
Is provided. In addition, in the configuration shown in FIG. 6, apart from the above-described manifold 32 for extruding the melts 12 ′ to 20 ′, additional melts 22 ′ and 24 ′ are provided in the T-die 30 as shown by chain lines. Extrusion passage 3
6, 38 are provided. Therefore, according to such a structure, the end multi-row layers 46, 4 made of the melt 22 'or 24' are formed on the ends of the sheet body 42 of the multilayer sheet 40 to be formed.
8 can be simultaneously molded in parallel. Therefore, in this case, even if the ears 44 are trimmed from the multilayer sheet 40, the ears 44 can be recycled.
It is possible to avoid the above-mentioned disadvantages, that is, a decrease in the yield of the raw material of the melt or a pollution problem due to the industrial waste. [0009] However, the above-mentioned technique can avoid a decrease in the yield of raw materials or a problem of pollution as described above. For this reason, there is another problem that the entire apparatus becomes complicated and the manufacturing cost increases. Incidentally, these other difficulties have been demanded for improvement in the past. Therefore, an object of the present invention is to avoid a decrease in the yield of a molten resin raw material, a problem of pollution, and the like.
An object of the present invention is to provide a feed block for an end multi-row multi-layer sheet which can be constructed simply and at low cost. In order to achieve the above object, a feed block for an end multi-row multilayer sheet according to the present invention comprises a plurality of molten resins laminated in order from a central layer to an outer layer. And a single-layer T-die for extruding the plurality of molten resins into a multilayer sheet at a position downstream of the feed block. In the block-type multi-layer sheet molding apparatus, the feed block manifold may include a portion of the respective molten resin on an end wall portion of the manifold and an existing molten resin for an intermediate layer and / or an outermost layer therein. Supply the molten resin in order to eliminate and replace
Manifold merges with the supply path in the feed block
Opening on the upstream end wall near the
And a supply auxiliary means comprising a bypass for supplying the intermediate layer and / or a part of the intermediate layer and / or the outermost layer of the molten resin on the end of the multilayer sheet body formed of the plurality of molten resins. The end multi-row layers to be formed are simultaneously molded in parallel. [0014] In the present invention, the end multi-row layer includes:
It is molded using a part of the sheet body molten resin supplied via the regulating means. In other words, the end multi-row layer can be achieved by using a common extruder in which the molten resin pressure, the molten resin temperature, and the like are all the same, without requiring a special extruder. Further, the molten resin supply assisting means can be easily constituted by a bypass in the feed block. Therefore, according to the present invention, it is possible to avoid a decrease in the yield of a molten resin raw material or the occurrence of a pollution problem, and to provide a simple and low-cost multi-end end multi-row sheet. A feed block can be easily provided. Next, an embodiment of a feed block for a multi-layered end sheet according to the present invention will be described in detail with reference to the accompanying drawings. For convenience of description, the same components as those of the conventional structure shown in FIGS. 4 to 6 are denoted by the same reference numerals, and detailed description is omitted. First, the present invention relates to a feed block type multilayer sheet forming apparatus, and therefore, similarly to the above-described conventional apparatus (FIG. 4), a plurality (five) of molten resin 12 ',
14 ', 16', 18 ', and 20' to the central layer (1
2 ') to the outer layers (14', 16 ', 18', 2)
0 '), a feed block 10 having manifolds 12, 14, 16, 18, and 20 each of which expands downstream, and a feed block 1
0 and the molten resin 12 ′, 14 ′, 1
6 ′, 18 ′ and 20 ′ are extruded from the manifold 32 and the slits 34 in a widened shape, so that the multilayer sheet 4 is extruded.
And a single-layer T-die 30 for forming a zero. However, according to the present invention, in the above-described structure, as shown in FIGS. 1A and 1B, the outermost layer manifolds 18 and 20 of the feed block 10 are made of molten resin 18 'and 20'. Of the existing molten resin 12 ', 1 on the end wall portions of the manifolds 18, 20.
Molten tree supplied so as to eliminate and replace 4 'and 16'
As a grease supply assisting means, a detour 18 that opens at an upstream end wall near where the manifolds 18 and 20 that supply the molten resin join the supply passage 28 in the feed block.
a, 20a. With this configuration, as shown in an enlarged view of FIG. 2A, five molten resins 12 ', 14', 1
Multilayer sheet body 4 formed from 6 ', 18', 20 '
The end multi-layer 46 formed from a part of the outermost molten resin 18 ′, 20 ′ is formed on the two end portions in parallel at the same time. Therefore, according to the present invention, the multilayer sheet 40
Even if the lugs 44 are trimmed, the lugs 44 are recycled, so that it is apparent that the yield of the molten resin raw material can be reduced, or the occurrence of pollution problems can be avoided. Further, the molten resin supply assisting means (18a, 20a) of the present invention has a simple structure as described above, and its operation is the same in that the molten resin pressure and the molten resin temperature are all the same. It is also clear that the whole apparatus can be constructed simply and at low cost, since this can be achieved with an extruder. In the present invention, the forming of the end multi-row layer is not limited to the outermost layer, but may be applied to an intermediate layer. That is, (b) of FIG.
(C) shows the end multi-row layer 46 as an intermediate layer (1
4 ', 16') and the middle and outermost layers (14 ', 1').
6 ', 18', and 20 '). In this case, it has been experimentally confirmed that the boundaries between the end multi-row layers and the sheet body are all clearly defined. FIG. 3 shows another embodiment of the present invention. That is, in the present embodiment, the manifolds 18 and 20 for the outermost molten resin 18 ′ and 20 ′ are provided as the molten resin supply auxiliary means in the supply path 2 in the feed block.
The deflection projection 26 is provided so as to be located on the end wall near the junction with the projection 8. Also in this embodiment, a part of the molten resin 18 ', 20'
6, the existing molten resin 12 ', 14', 1
The end multi-row layers 46 can be simultaneously formed in parallel by supplying them so as to be replaced in the 6 'space. The other operations and effects are the same as those in the previous embodiment, and thus detailed description is omitted. The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the spirit of the present invention. As described above, the feed block for the multi-layered end sheet according to the present invention merges a plurality of molten resins in a laminated manner from the central layer to the outer layer. A feed block having a manifold expanded on the downstream side and a single-layer T-die for extruding the plurality of molten resins into a multilayer sheet located on the downstream side of the feed block; In the sheet forming apparatus, the manifold of the feed block removes a part of the respective molten resin on an end wall portion of the manifold and removes the existing molten resin with respect to the intermediate layer and / or the outermost layer therein. The manifold that supplies the molten resin to supply it to replace
The upstream end near the junction with the supply path in the feed block
A bypass that opens in the wall and supplies a part of the molten resin
Ranaru provided supplying auxiliary means, on an end portion of the multilayer sheet body formed from the plurality of molten resin, said intermediate layer and / or the end is formed by merging from a portion of the outermost layer of the molten resin multi By adopting a configuration in which the row layers are formed in parallel at the same time, the end multi-row layer can be easily configured, and its operation uses a common extruder in which the molten resin pressure and the molten resin temperature are all the same. Thus, it can be achieved without requiring a special extruder. Therefore, according to the present invention, it is possible to avoid a decrease in the yield of a molten resin raw material or the occurrence of a pollution problem, and to provide a simple and low-cost multi-end end multi-row sheet. The feed block can be easily provided.

[Brief description of the drawings] FIG. 1 is a feeder for a multi-layered end sheet according to the present invention.
FIG. 3 shows an embodiment of a lock, wherein (a) is a plan view,
(B) is a sectional view taken along the line I (B) -I (B) of (a). FIG. 2 is formed using the feed block shown in FIG.
(A) shows a cross section of an outer layer.
FIG. 3B is a cross-sectional view of the intermediate layer, and FIG.
It is sectional drawing of a layer and an intermediate | middle layer. FIG. 3 is a feeder according to the present invention for a multi-row end sheet.
FIG. 8 shows another embodiment of the lock, wherein (a) is a plan view,
(B) is a sectional view taken along the line III (B) -III (B) of (a). FIG. 4 is a general feed block type multilayer sheet molding apparatus.
(A) is a plan sectional view of a main part, and (b) is
FIG. 6A is a cross-sectional view of a main part of the line VI (B) -VI (B), and FIG.
It is an expanded sectional view of VI (C) part of (a). FIG. 5 is a conventional end multi-row and multi-row in the molding apparatus shown in FIG. 4;
FIG. 3 is a plan cross-sectional view of a main part showing a feed block for layer sheets
You. FIG. 6 shows a conventional end multi-row multi-unit in the molding apparatus shown in FIG.
It is an outline perspective view showing the single layer type T die for layer sheets. [Explanation of symbols] 10 Feed block 12-20 manifold 12'-20 'Molten resin 18a, 20a detour 26 deflection projection 28 Supply channel 30 Single-layer T-die 32 manifold 34 slit 40 multilayer sheet 42 Seat body (main part) 44 Ears (trimming part) 46 end multi-row layer

Claims (1)

(57) [Claims 1] A feed block having manifolds which are respectively expanded on the downstream side, in which a plurality of molten resins are sequentially merged in a laminated manner from the center layer to the outer layer, and the feed block. And a single-layer T-die for extruding the plurality of molten resins into a multilayer sheet located downstream of the feedblock-type multilayer sheet molding apparatus, wherein the manifold of the feedblock includes an intermediate layer therein and / or with respect to the outermost layer content, of their respective melting tree
A portion of the fat is placed on the end wall of the manifold using existing molten wood.
The molten trees to supply to replace with the exclusion of fat
Manifold that supplies grease supplies inside the feed block
Open at the upstream end wall near the junction with the road,
The supply auxiliary means consisting bypass passage for supplying a part of the fat is provided, on the end of the multilayer sheet body formed from the plurality of molten resin, said intermediate layer and / or the outermost layer of the molten tree
A feed block for an end multi-row multilayer sheet, wherein end multi-row layers formed by merging a part of fat are simultaneously formed in parallel.