JPH10100163A - Plastic trim shredding apparatus and shredding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly shred two stripes of trims generated in a strip-like plastic manufacturing process without generating noise. SOLUTION: Two stripes of trims are separately passed through respectively independently operated dancer rolls 2a, 2b to preliminarily detect the displacement quantities of the dancer rolls and two stripes of the trims are separately taken over by using two slitter rolls 4a, 4b to be slit while a taking-over speed is adjusted so that the detected displacement quantities are set within a predetermined range and the slit trims are collectively cut by using one rotary cutter 5. Two stripes of the trims can be shredded square without slackening or excessively pulling one of them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic trim (so-called "mimi", hereinafter referred to as "trim") generated in a manufacturing process of a belt-shaped plastic film or a plastic sheet (hereinafter collectively referred to as "plastic sheet"). The present invention relates to a plastic trim shredding device and shredding method. The trim can be collected and reused in a reuse process.

[0002]

2. Description of the Related Art Trim, which is a by-product in the plastic sheet manufacturing process, is usually continuously sucked by an ejector or the like, sent to a shredder or pulverizer by a pneumatic conveyor, shredded or pulverized, and then melted. It has been pelletized and reused.

[0003]

However, since the trim recovery method described above is so noisy, a shredder or pulverizer as a noise source is installed separately in another place and transported by a pneumatic conveyor. . However, a large amount of gas is required to transport the trim to a distant place, and the noise generated from a suction device such as an ejector increases, which still poses a major problem in the working environment. In some cases, trims generated at both left and right ends are combined into one, taken up by a single slitter roll with low noise, slit, and further shredded using a shredder. However, in order to collect the left and right trims collectively, during operation, one of the trims may be slackened or excessively pulled, so that it may not be possible to slit smoothly and hinder the operation. It was necessary to cut one of the trims and reinsert it into the slitter roll to align the left and right slacks. The present invention has been completed in order to provide a device and a method for smoothly trimming a trim in consideration of the working environment.

[0004]

The present invention will be described with reference to the drawings. The present invention relates to a plastic trim shredding device for shredding trims (1a, 1b) cut and separated on both left and right sides of a belt-shaped plastic sheet, and separately passes two separated plastic trims. Rolls (2a, 2b), displacement detectors (3a, 3b) for each dancer roll, and two slitter rolls (4a, 4a, 4a, 2a) for independently taking and slitting the plastic trim that has passed through each dancer roll. 4b) and a single rotary cutter (5) for cutting the slitted plastic trim together.

Further, according to the present invention, two strips of a strip-shaped plastic sheet cut and separated on both left and right sides are separately passed through dancer rolls which operate independently, and the displacement of the dancer roll is detected. The two trims that passed through the dancer roll were separately pulled and slit using two slitter rolls while adjusting the take-up speed so that the detected displacement remained within a predetermined range. The present invention provides a plastic trim shredding method, characterized in that the trims are collectively cut using a single rotary cutter.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described with reference to the drawings showing an embodiment of the present invention. FIG. 1 is a schematic plan view of a plastic trim shredding device according to the present invention, FIG.
FIG. 4 is a partial cross-sectional plan view of a slitter roll portion, taken along line A-A ′ (excluding a cover portion).

The left and right trims 1a and 1b cut and separated from the plastic sheet body by a trim cutter (not shown) are separately inserted into the plastic trim shredding device of the present invention by insertion guide rolls 6a and 6b, respectively. You. The inserted two trims pass through the dancer rolls 2a and 2b, respectively, to form the second guide rollers 7a and 7b.
It is led to. Displacement detectors 3a and 3b are attached to the dancer rolls 2a and 2b, respectively, to detect the displacement of the dancer rolls 2a and 2b and measure the slackness of the trims 1a and 1b. There are no particular restrictions on the type of displacement detector. For example, in the embodiment of FIG. 1, a detector that detects the displacement of the dancer roll as the displacement angle of the mounting arms 7a and 7b is used.

The trims 1a, 1b guided from the dancer rolls 2a, 2b to the second guide rolls 8a, 8b are taken from the sheet insertion openings 9a, 9b into two sets of slitter rolls 4a, 4b by fitting rotary blades. And slit to the required width. The peripheral surface of the slitter roll is
Gears should be processed so that the trim does not slip and can be taken off smoothly. FIG. 4 shows a cross section of a slitter roll portion. Slitter rolls 4a, 4
The take-up speed of the trims 1a, 1b by b is based on the signals from the displacement detectors 3a, 3b, and the position of the dancer rolls 2a, 2b is directly or indirectly kept within a predetermined range for each strip. As such, they are independently controlled.
Depending on conditions, on / off control may be employed for speed control.

The slits 1a and 1b slit by the slitter rolls 4a and 4b are collectively sent to one cutting machine or rotary cutter 5 by gravity, for example, and cut into short rectangular pellets. In the present invention, one cutting machine includes, for example, attaching two coaxial rotary blades 12 to one rotary blade motor and shredding the slits 1a and 1b.

[0010]

According to the plastic shredding device of the present invention, the two trims are automatically adjusted independently of speed without slackening or excessive pulling, and the slits are cut into squares. Can be shredded. In addition, since the noise is low, there is an effect that even if it is installed at the operation site, there are few problems. Particularly, it is suitable for a process in which the trim generation speed is relatively low, and has an advantage that it can be directly collected as a square pellet without generating powder when cutting a thick plastic sheet.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a plastic trim shredding device according to the present invention.

FIG. 2 is an explanatory side view with a part removed.

FIG. 3 is a schematic view taken in the direction of arrows in FIG.

FIG. 4 is a plan view of a slitter roll portion.

[Explanation of symbols]

1a, 1b: plastic trim 2a, 2b: dancer roll 3a, 3b: displacement detector of dancer roll 4a, 4b: slitter roll 5: rotary cutter 6a, 6b: insertion guide roll 7a, 7b: mounting arm 8a, 8b: first 2 guide roll 9a, 9b: sheet insertion opening 10a, 10b: motor for slitter 11: motor for rotary cutter rotary blade 12: rotary blade

Claims (2)

[Claims] 1. A plastic trim shredding device for shredding trims (1a, 1b) cut and separated on both left and right sides of a strip-shaped plastic sheet, wherein the two separated plastic trims are separately passed through.
Two dancer rolls (2a, 2b), displacement detectors (3a, 3b) for each dancer roll, and two slitter rolls (4a) for independently taking and slitting the plastic trim that has passed through each dancer roll. , 4b), and one rotary cutter (5) for cutting the slitted plastic trim together. 2. The two strips of the strip of plastic sheet cut and separated on the left and right sides are separately passed through dancer rolls that operate independently, and the displacement of the dancer roll is detected, The two trims that have passed through the rolls are separately pulled and slit using two slitter rolls while adjusting the pulling speed so that the detected amount of displacement remains within a predetermined range. And cutting using a single rotary cutter.