JP2004226320A - Sampling system of granular product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system and a method for sampling a representative sample of a lot for the purpose of a quality inspection etc. of a granular product such as pellets etc. of a synthetic resin massively produced in a synthetic resin manufacturing factory etc. <P>SOLUTION: The system for continuously sampling the granular product transported in piping comprises a movable sampling nozzle inserted into transportation piping from a perforation part of the transportation piping through a branch pipe outwardly and downwardly extending and partially having an opening at a tip, a pipeline for transporting the granular product sample continuously collected from the sampling nozzle to a sample storage through a cyclone and the sample storage. A required quantity of the representative sample can be obtained by continuously sampling the granular product transported from the movable sampling nozzle having the opening at the tip. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for sampling granular products, and more specifically, in a synthetic resin manufacturing plant or the like, samples a representative sample of a lot for the purpose of quality inspection of granular products produced in large quantities such as synthetic resin pellets. And systems and methods for the same.
[0002]
[Prior art]
In a synthetic resin manufacturing plant, a synthetic resin product to be manufactured is often in the form of pellets, is divided into lots of several to several tens of tons, and is sent to a shipping process after quality inspection.
For example, in the production of polypropylene, after a polymerization step, pelletization is performed by a granulator and separated into tens of tons, and quality inspection (melt index, color tone, shape, foreign matter, etc.) is performed. However, it cannot be said that the whole is uniform because of solids, and it is not easy to collect a representative sample from a product lot of granular products because of a large lot size. Furthermore, the quality inspection items differ depending on the product type, and the required sampling amount may differ.
Conventionally, quality inspection samples have been spot-sampled from any part of the product lot, but are not necessarily representative samples of that lot, and in that sense, the inspection results are also used as quality inspection results for that lot. Was unreliable.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a system and a method for sampling a representative sample of a lot in a synthetic resin manufacturing plant or the like for the purpose of quality inspection of granular products mass-produced such as synthetic resin pellets. And
[0004]
[Means for Solving the Problems]
The present inventors have studied variously in order to solve the above problems, and in many cases, granular products are pneumatically transported to a hopper or the like for commercialization after pelletizing by a pelletizer or the like (hereinafter, air transported). It is possible to collect a representative sample of the lot if continuous sampling is performed during the empty transport, and to collect a required sample amount arbitrarily by using a specific sampling means. The inventors have found that the present invention can be performed, and have completed the present invention.
[0005]
That is, the present invention is a system for continuously sampling the granular product which is pneumatically fed through the pipe, and the pneumatic feeding pipe through the branch pipe extending outward and downward from the perforated portion of the pneumatic feeding pipe of the granular product. A movable sampling nozzle having an opening at a part of a tip portion inserted therein, a piping line for sending a granular product sample continuously collected from the sampling nozzle to a sample reservoir via a cyclone, and a sample reservoir. Provide a granular product sampling system.
Further, the present invention is a method for continuously sampling granular products which are pneumatically fed through a pipe, wherein the pneumatic feeding pipe is passed through a branch pipe extending outward and downward from a perforated portion of the pneumatic feeding pipe of the granular product. A granular product to be fed by air is continuously sampled from a movable sampling nozzle having an opening at a part of a tip portion inserted therein, and a collected granular product sample is stored from the sampling nozzle through a cyclone. To provide a sampling method for granular products to be sent to
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a sampling system and a sampling method of the present invention will be described in detail with reference to FIG. 1 by taking a sampling system and a sampling method for polyolefin pellets as an example.
[0007]
Near the final stage of the polyolefin product manufacturing process, there is a step of pelletizing the polyolefin with a pelletizer and pneumatically transporting the polyolefin to a pellet silo, which is a product storage tank for shipping, through the pellet emptying pipe 1.
In the present invention, the movable sampling nozzle 3 is inserted into the pellet empty feed pipe 1 through the branch pipe 2 extending outward and downward from the perforated portion of the pellet empty feed pipe 1 to continuously feed the polyolefin pellets fed by air. It is to sample.
[0008]
A sample of the collected polyolefin pellet is sent from the movable sampling nozzle 3 to the sample reservoir 5 via the cyclone 4.
The sample is air-fed from the movable sampling nozzle 3 to the cyclone 4 through the pipe 6, and the air and the pellet sample are separated in the cyclone 4. The pellet sample is transferred by gravity through a pipe 7 to a sample reservoir 5 located below the cyclone 4.
[0009]
By a constant amount of continuous sampling from the movable sampling nozzle 3 throughout the entire idle time of the lot, a representative sample of the lot is collected in the sample reservoir 5. The sample stored in the sample reservoir 5 is withdrawn from the ball valve 8 and shaken and mixed well in a bag that has received the sample to homogenize. Then, a required amount is collected and subjected to quality inspection.
The quality inspection items in the case of polyolefin pellets are usually a melt index, a color tone, a pellet shape, a foreign matter, and the like. However, when there is an item to be inspected by stretching a film, a relatively large amount of sample is required.
The remaining sample can be prepared as a reserve lot for re-analysis or the like at a later date.
[0010]
With the above sampling system and sampling method, a representative sample of the lot can be collected. However, there is a restriction on the required amount for quality inspection and the capacity of the sample reservoir 5, and the continuous sampling amount must be compatible with it. Cost. Further, since the lot size is not constant, the sampling amount per unit time according to the lot must be used.
That is, the amount of sampling per unit time in continuous sampling by the movable sampling nozzle 3 from the empty pellet delivery pipe 1 needs to be variable.
[0011]
For this reason, it is preferable that the movable sampling nozzle 3 has the following structure.
That is, the movable sampling nozzle 3 is a tube having an opening 9 at a part of the distal end, and can be moved up and down in the branch tube 2 and can be rotated. That is, the position (depth) and direction of the tip opening 9 of the movable sampling nozzle 3 can be changed in the empty pellet feeding pipe 1.
[0012]
Since the tip opening 9 of the movable sampling nozzle 3 is opened at a part of the tip, the direction of the nozzle 3 is adjusted so that the upstream of the pellet emptying pipe 1, that is, the pellet flow flows. The opening area in the incoming direction is variable, and the sampling amount per unit time can be adjusted.
In addition, the pellets do not always flow uniformly and distributed in the pellet empty transport pipe 1. In the case of a lateral empty transport pipe, due to gravity, the pellet is usually below the pellet empty transport pipe 1. It is thought to flow a lot. Therefore, by adjusting the position (depth) of the movable sampling nozzle 3 in the pellet empty feed pipe 1, it is possible to adjust the sampling amount per unit time due to the difference in the pellet amount of the pellet flow taken into the opening 9. Become.
If the tip opening 9 is opened in the tip tube wall of the movable sampling nozzle 3 and the upper surface of the tube is closed, the upper surface of the nozzle 3 is kept at the same position as the tube wall of the pneumatic feeding pipe 1. By retracting the movable sampling nozzle 3 into the branch pipe 2, it is possible to cope with unnecessary sampling.
The shape of the tip portion of the sampling nozzle 3 is not particularly limited, but is the same as the pipe wall of the air feeding pipe 1 so that pellets flowing in the air feeding pipe 1 when retracted into the branch pipe 2 do not accumulate. A shape that can be close to the surface is preferable. As described below, when the sampling nozzle 3 is obliquely inserted into the pneumatic feeding pipe 1, the shape is obliquely cut when viewed from the side.
[0013]
The insertion angle of the movable sampling nozzle 3 into the empty pellet delivery pipe 1 (the angle at which the branch pipe 2 extends from the empty pellet delivery pipe 1) is not particularly limited. Preferably, it is inserted obliquely in the downstream direction.
[0014]
The structure is not particularly limited as long as the movable sampling nozzle 3 and the branch pipe 2 are slidable and can be stopped. For example, the movable sampling nozzle 3 having the following structure shown in FIG. Can be
[0015]
That is, the sampling nozzle main pipe 10 through which the sampled pellets pass and the sampling opening are joined on the opposite side (downward) of the sampling opening, and have a jacket 11 that covers the outside of the branch pipe 2. It is slidable by an O-ring attached to the part. A fixing screw 12 for fixing the sampling nozzle to the branch pipe is provided inside the O-ring sliding portion of the jacket 11, and a handle 13 for operating the sampling nozzle is provided at a lower end of the jacket.
[0016]
Further, the lower end of the movable sampling nozzle 3 and the pipe 6 are connected by a flexible tubular connecting member 14 such as a flexible hose.
[0017]
The sample reservoir 5 is preferably a vertically long cylindrical shape having an upper and lower viewing window at the front so that the sampling amount can be recognized, and it is more preferable that the viewing window has a measuring scale.
The depth and direction in which the movable sampling nozzle 3 is inserted into the pellet emptying pipe 1 are adjusted by observing the state of accumulation of the pellet sample from the viewing window of the sample reservoir 5 to obtain the amount of the pellet sample per unit time. To adjust.
[0018]
Since the sampling system and the sampling method of the present invention are configured as described above, it is possible to sample a representative sample of a lot of granular products produced in large quantities for the purpose of quality inspection and the like.
Therefore, the sampling system and the sampling method of the present invention are not limited to sampling for the purpose of quality inspection of synthetic resin products in a synthetic resin factory, and various chemical products, cereals, granular products such as foods, and the like. It can be suitably used when a representative sample needs to be collected in addition to inspection.
[0019]
【The invention's effect】
In a process such as the production of granular products, a representative sample of the lot is collected by continuously sampling the granules during the empty transport, and at this time, a movable sampling nozzle having an opening at a part of the tip is used. By using this, a required sample amount can be arbitrarily collected.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a particle sampling system according to the present invention.
FIG. 2 is a conceptual diagram showing an example of a movable sampling nozzle used in the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 Pellet empty feed pipe 2 Branch pipe 3 Movable sampling nozzle 4 Cyclone 5 Sample reservoir 6 Pipe 7 Pipe 8 Ball valve 9 Tip opening 10 Sampling nozzle main pipe 11 Outer jacket 12 Fixing screw 13 Operation handle 14 Flexible tubular connecting member

Claims (2)

A system for continuously sampling the granular product which is pneumatically fed through the pipe, wherein the granular product is inserted into the pneumatic transport pipe through a branch pipe extending outward and downward from a perforated portion of the pneumatic transport pipe, A movable sampling nozzle having an opening at a part of a tip portion, a piping line for sending a granulated product sample continuously taken from the sampling nozzle to a sample reservoir via a cyclone, and a sample reservoir; Sampling system. A method of continuously sampling the granular product which is pneumatically fed through the pipe, wherein the granular product is inserted into the pneumatic transport pipe through a branch pipe extending outward and downward from the perforated portion of the pneumatic transport pipe, A granular product that continuously samples the granular product to be fed by air from a movable sampling nozzle having an opening at a part of the tip, and sends a collected granular product sample from the sampling nozzle to a sample reservoir via a cyclone. Product sampling method.

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