JP2514610Y2 - Calender molding equipment - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is a calendar forming apparatus for forming a sheet or film from a raw material such as a thermoplastic synthetic resin by rolling, and particularly, the thickness distribution in the width direction is excellent. The present invention relates to a calender forming device provided with five calender rolls to obtain a product.

(Prior art and its problem) In calendering, due to bending deformation due to roll load, the thickness distribution in the width direction of the formed sheet or film tends to become thicker toward the central portion. Conventionally, as one means for solving such a problem, by axially intersecting the rolls, the roll gap on the roll end side is increased and balanced with the increase in the gap in the central part due to bending deformation of the roll. So-called roll crossing is performed.

Also, there are various numbers and arrangements of rolls used in the calender forming device, but in recent years, a device formed by arranging five rolls having particularly good thickness accuracy of formed sheets and films has been used. It's starting. An example of such an apparatus is shown in the schematic sectional views of FIGS. 2 and 3, but the above-mentioned apparatus for roll crossing is usually provided on the final roll 5, and the end of the final roll is moved to make the final roll. Axial crossing is performed between the fixed rolls 4 contacting with each other. Further, in the calender forming apparatus, it is necessary to take out the sheet or film formed by the gap between the calender rolls by the take-off roll 6 having a small diameter provided in the vicinity of the calender rolls. As shown in FIG. 3, it is provided close to the final roll 5.

However, in a device having such a roll arrangement, the final roll 5 is moved by the roll crossing device, so that the distance between the take-off rolls 6 differs in the roll width direction, and as a result, the thickness of the sheet or film to be taken in the width direction. There are problems that the distribution becomes poor and the neck-in phenomenon that shrinks in the width direction increases.

(Means for Solving the Problem) The present invention has found that the above-mentioned problems can be solved by arranging the calender rolls and the take-off rolls in a specific arrangement. In a calender molding device having five calender rolls provided with a roll crossing device, a take-off roll 6 is provided in the vicinity of the fixed roll 4 in contact with the final roll 5.

 Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a schematic sectional view showing a calender forming apparatus of the present invention, in which a take-off roll 6 is arranged on a so-called M-type five calender roll.

The arrangement of the calendar roll is the same as the conventional device,
Raw materials are between NO1 roll 1 and NO2 roll 2, NO2 roll 2 and N
The O3 rolls 3, the NO3 rolls 3 and the NO4 rolls 4, and the NO4 rolls 4 and the final rolls 5 are kneaded and formed while forming banks, respectively, and taken by the take-off rolls 6 adjacent to the NO4 rolls (fixed rolls).

Since the NO4 roll 4 is a fixed roll, it is not affected by roll crossing, and the take-off roll 6 can be arranged closer to it. Therefore, a sheet or film having excellent thickness distribution and less neck-in can be obtained. Obtainable.

(Effect of the Invention) As described above, the calender molding apparatus of the present invention has an advantage that a sheet or film having a good thickness distribution in the width direction can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of the calender molding apparatus of the present invention, and FIGS. 2 and 3 are schematic sectional views of a conventional calender molding apparatus. 1 …… NO1 roll, 2 …… NO2 roll, 3 …… NO3 roll, 4 …… NO4 roll (fixed roll) 5 …… Final roll, 6 …… Take off roll

Claims (1)

(57) [Scope of utility model registration request] 1. A calender forming device comprising five calender rolls provided with a roll crossing device on the final roll, wherein a take-off roll (6) is provided close to a fixed roll (4) in contact with the final roll (5). A calender forming device characterized by being provided with.