JPH0646933U - Extrusion head - Google Patents

Abstract

(57) [Summary] [Structure] A distribution chamber 4 and a nozzle 5 are provided between the upper die 2 and the lower die 3, and the fluid M supplied to the distribution chamber 4 is discharged in a sheet state through the nozzle 5. The extrusion head 1 whose sheet thickness is adjusted by the movable lip 10 is connected to the supply passage 6 for the fluid M at the center of the distribution chamber 4, and the screws 13a and 13b are provided in the left and right regions of the distribution chamber 4, respectively. , Screws 13a, 13b are separated by separate motors 16a,
16b to drive the fluid M equally to the left and right regions of the nozzle 5. [Effect] By adjusting the rotation speeds of the screws 13a and 13b, the fluid M can be evenly distributed in the left and right regions of the nozzle 5.
Therefore, the thickness adjustment of the sheet S by the movable lip 10 becomes easy.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an extrusion head of an extruder for extruding a melted material such as plasticized rubber or plastic (hereinafter collectively referred to as “fluid”) to form a wide sheet.

[0002]

[Prior art]

 Conventionally, as the extrusion head, a distribution path extending in the sheet width direction and a nozzle extending from the distribution path to the end surface of the die are provided between the upper die and the lower die, and the supply path is supplied from one end side of the distribution path. It is known that the fluidized material is conveyed toward the other end while being ejected in a sheet state from a nozzle, and the sheet thickness is adjusted by a movable lip provided in the nozzle ejection portion.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned extrusion head, the fluidity and pressure change greatly before the fluid supplied from one end side of the distribution chamber is conveyed to the other end side, so that the amount supplied to each part of the nozzle is stable. Without doing so, it took a lot of time and effort to adjust the movable lip.

[0004]

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and the first invention is a distribution chamber extending in the seat width direction between an upper die and a lower die, and a distribution animal supplied to the distribution chamber. And a nozzle for ejecting the liquid, the fluid supplied to the distribution chamber is ejected in a sheet state through the nozzle, and the movable lip of the nozzle ejecting section adjusts the sheet thickness. The supply passage is connected to the center of the distribution chamber, and screws are provided in the left and right regions of the distribution chamber, respectively, and the screws are driven by different drive sources to remove the fluid supplied from the supply passage. It is designed to be transported to both ends of the distribution chamber. According to a second aspect of the present invention, a supply passage is connected to a central portion of the distribution chamber, and the distribution chamber is provided with screws having transportability in opposite directions in the left and right regions of the distribution chamber. Driven by a drive source, the fluid supplied from the supply path is conveyed to both ends of the distribution chamber.

[0005]

[Action]

 In the extrusion head, the fluid is supplied to the central portion of the distribution chamber through the supply passage. The fluid supplied to the distribution chamber is conveyed to the left and right regions of the distribution chamber by the screws on both sides, sequentially supplied to the nozzles, and discharged in a sheet state. In addition, in the extrusion head according to the first invention, by adjusting the number of revolutions of the screw to equally adjust the amount of the fluid supplied to the left and right regions of the distribution chamber, and by adjusting the movable lip, The sheet thickness is adjusted.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. In the extrusion head 1 shown in FIGS. 1 and 2, between the upper die 2 and the lower die 3, a circular sectional distribution chamber 4, a nozzle 5 extending from the distribution chamber 4 toward the front end surface of the die, and a distribution chamber A supply path 6 extending from the central portion of the nozzle 4 to the rear end surface of the die is formed, and a manifold 7 is formed substantially in the middle of the nozzle 5. The nozzle portion extending from the distribution chamber 4 to the manifold 7 gradually extends toward the manifold 7. The taper 8 is attached so that it becomes thinner. The movable lip 10 is provided at a front end portion of the upper die 2 which faces the nozzle 5, that is, a lip portion 9, and is supported by a bolt 11 so as to be vertically movable. The transport member 12 is configured by rotatably connecting two screws 13a and 13b having the same length, and is housed in the distribution chamber 4, and the respective screws 13a and 13b are connected to the drive connecting portions 14a and 14b. The motors 16a and 16b are drivingly connected to the motors via speed reducers 15a and 15b, respectively. The screws 13a and 13b may be provided with spiral blades around the rotary shaft, or may be blades with a predetermined length attached around the rotary shaft at predetermined intervals. Further, reference numerals 17, 18 and 19 are channels of hot water or cooling water provided in the upper die 2, the lower die 3 and the carrying member 12, respectively.

With the above configuration, in the extrusion head 1, the left and right screws 13a and 13b rotate in the same direction (direction of arrow a) based on the rotation of the motors 16a and 16b. The fluid M, which is a material for the wide sheet, is supplied to the central portion of the distribution chamber 4 via the supply path 6, and is sent to the nozzle 5 while being conveyed to both ends by the screws 13a and 13b. The fluid M supplied to the nozzle 5 is pressure-adjusted by the manifold 7 and then discharged from the lip portion 9, whereby the wide sheet S is formed. Further, hot water or cooling water is supplied to the water passages 17, 18 and 19, respectively, so that the dies 2 and 3 and the carrying member 12 are maintained at appropriate temperatures.

To adjust the thickness of the sheet S, the rotational speeds of the motors 16a and 16b are adjusted to set the amount of the fluid M to be distributed to the left and right regions of the distribution chamber 4 evenly, and the movable lip 10 is moved up and down. It is performed by adjusting the amount of the fluid M discharged from the portion 9. Therefore, if the gaps of the nozzles 5 in the left and right regions are made equal by the movable lip 10, then it is possible to obtain a sheet S having a substantially uniform thickness simply by adjusting the rotational speeds of the motors 16a and 16b. Even if there is a variation in the sheet thickness, the amount thereof is small, and therefore the adjustment of the movable lip 10 after that is small.

Although the manifold 7 is formed in the nozzle 5 in the above embodiment, the manifold 7 is not always necessary. As a means for adjusting the thickness of the sheet S, a choke bar facing the nozzle 5 may be provided, and the sheet thickness may be adjusted by using the choke bar and the movable lip 10. Further, although the screws 13a and 13b are drivingly connected to the separate motors 16a and 16b, respectively, the screws 13a and 13b may be connected to each other in a non-rotating state so that they may be rotated by a single motor. Good. However, in this case, the blade portions provided on the outer circumferences of the screws 13a and 13b must be provided so as to exhibit the transportability in the opposite directions.

[0010]

[Effect of device]

 As is clear from the above description, in the extrusion head according to the present invention, the distribution chamber is provided with a screw, and the fluid supplied from the central portion of the distribution chamber is distributed to the left and right regions by the screw. Therefore, it is possible to evenly distribute the supplied fluid to the left and right to obtain a sheet having the same thickness on the left and right. In addition, in the case where the transport member is separated into screws located in the left and right areas and these are drive-connected to separate drive sources, by adjusting the rotation speed of the screw, the fluid is evenly distributed in the left and right areas. This makes it easy to adjust the seat thickness with the movable lip.

[Brief description of drawings]

FIG. 1 is a perspective view of an extrusion head.

FIG. 2 is a sectional view of an extrusion head.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Extrusion head, 2 ... Upper die, 3 ... Lower die, 4 ... Distribution chamber, 5 ... Nozzle, 6 ... Supply path, 7 ... Manifold, 9
... lip portion, 10 ... movable lip, 12 ... transport member, 13
a, 13b ... screw, 16a, 16b ... motor, M
… Fluid, S… Sheet.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Saburo Motomiya 4-7 Mikuradori, Nagata-ku, Kobe City, Hyogo Prefecture (72) Inventor Toranosuke Murakami 1-10-14 Chikusa, Takarazuka City, Hyogo Prefecture

Claims (2)

[Scope of utility model registration request] 1. A distribution chamber extending in the sheet width direction and a nozzle for discharging the fluid supplied to the distribution chamber are provided between the upper die and the lower die, and the fluid supplied to the distribution chamber is provided. In an extrusion head in which a sheet is discharged through the nozzle and the sheet thickness is adjusted by a movable lip of the nozzle discharge part, a supply path is connected to the central part of the distribution chamber, and the left and right sides of the distribution chamber are connected. A screw is provided in each of the areas, and the screws are driven by different drive sources to convey the fluid supplied from the supply passage to both ends of the distribution chamber. 2. A distribution chamber extending in the sheet width direction and a nozzle for discharging the fluid supplied to the distribution chamber are provided between the upper die and the lower die, and the fluid supplied to the distribution chamber is provided. In an extrusion head in which a sheet is discharged through the nozzle and the sheet thickness is adjusted by a movable lip of the nozzle discharge unit, a supply path is connected to a central portion of the distribution chamber and the discharge chamber is connected to the distribution chamber. Screws having transportability in opposite directions are provided in the left and right regions of the distribution chamber, and the screw is driven by a drive source so that the fluid supplied from the supply path is transported to both ends of the distribution chamber. An extrusion head characterized in that