JP7296463B2 - Methods of packaging particulate materials, pastes or gels - Google Patents

Description

The present invention relates to a method of packaging particulate materials, pastes or gels, more particularly solid industrial chemicals.

Many particulate compounds such as solid peroxides per se, solid peroxide formulations and polymer additives are packaged in flexible packaging, e.g. , for example packaged in (cardboard or fibreboard) boxes or (textile) cylindrical containers. A bag is the primary packaging and a box or cylinder is the shipping packaging.

Packaging technology in general presents a wide range of performance requirements. Depending on the article to be packaged, the packaging must achieve a great variety of properties. In addition to the mechanical strength of the packaging material, the ease or force of opening, the options for dispensing, i.e. injection, aspiration, withdrawal, as well as the type of indication, are under constant technical development.

The field of retail packaging, especially food packaging, emphasizes the ease of sealing items and dispensing the packaged items. Liquids are often contained in plastic and glass jars, bottles and tubs, and plastic and paper bags such as sachets, envelopes or stick packages.

For example, WO 2017/135927 relates to a bag-in-box type package with collapsed headspace. Packages are provided for thermoplastic bagged liquid or flowable products that are inserted into or completely enclosed within a box or carton having a relatively rigid outer surface. The package is provided with an access port in the top portion of the box for inserting a rigid implement such as a straw, for example, and is punched through the thermoplastic bag to access the items inside. .

It corresponds to the requirement of full identification when packaging goods, hereinafter designated as authenticated goods, which require a certificate for eg safety reasons. These items may require certification, for example, because they are dangerous items. The method of obtaining goods must be secure. Packages shall be labeled. This indication is associated with strict legal requirements.

The box disclosed in WO2017/135927 is not suitable for packaging certified articles, especially when the certified articles represent particulate materials, pastes or gels. These forms of authenticated articles often overflow after removal of the sealing tape on the top of the package. According to this state-of-the-art packaging, if the packaging has an access opening and if this access opening is perforated, the certified goods are exposed to air and moisture, and are protected from contact with air and moisture. , may be detrimental to certified goods, or even violate legal requirements. This type of packaging is not suitable for packaging certified goods.

The United Nations Globally Harmonized System of Classification and Labeling of Chemicals (GHS) provides Regulation on Classification, Labeling and Packing of Substances and Mixtures. ging (CLP rules )), which requires information on chemical content and safety to be both on the primary packaging and on the outside of the transport packaging. GHS and CLP also require that this information be provided in the languages of all countries in which the product is sold.

Stock of pre-printed bags when a product is reclassified or marketed in a new country, or when revised regulations require different or additional information The entirety must be replaced by a new one containing additional or revised information.

A possible solution to this problem would be to manually mark the bag instead of pre-printing it. But it's an unglamorous job that requires employees who can understand the label and its relevance to the product.

It is therefore an object of the present invention to provide a manner of packaging authenticated articles that solves this problem.

A solution is realized by attaching a flexible wrapper to the inside of a rigid wrapper, so that the combined wrapper is considered the primary wrapper, and only the outside of the combined wrapper is must be displayed.

Accordingly, the present invention is a method of packaging a particulate material, paste or gel, said method comprising:
- providing a rigid packaging having a bottom surface, a top surface and vertical walls, said rigid packaging being open at the top surface and containing an adhesive layer on at least part of the inner bottom surface or the inner vertical wall; step,
- filling the flexible packaging with particulate material, paste or gel;
- contacting the filled flexible packaging with an adhesive layer, thereby adhering the flexible packaging to the rigid packaging;
- relates to a method comprising closing a rigid packaging, wherein the particulate material, paste or gel is a compound requiring GHS and/or CLP labeling.

The particulate material is preferably packaged. Accordingly, in a preferred embodiment, the present invention is a method of packaging particulate material, said method comprising:
- providing a rigid packaging having a bottom surface, a top surface and vertical walls, said rigid packaging being open at the top surface and containing an adhesive layer on at least part of the inner bottom surface or the inner vertical wall; step,
- filling the flexible packaging with particulate material;
- contacting the filled flexible packaging with an adhesive layer, thereby adhering the flexible packaging to the rigid packaging;
- relates to a method comprising closing a rigid package, wherein the particulate material is a compound requiring GHS and/or CLP labeling.

Rigid Packages Rigid packages should be rigid enough to maintain shape during shipping, storage, and handling.
The rigid package preferably has the shape of a cylinder, cube or cuboid.
Rigid packages are preferably boxes, cylinders, crates or pails.
The rigid packaging is preferably made from (corrugated) cardboard, fiberboard or plastic material.

A rigid package has a bottom surface, a top surface and vertical walls. The vertical walls of the cuboidal or cuboidal package consist of four side walls. A vertical wall of a package having the shape of a cylinder is a cylinder wall. The inner bottom surface is the side of the bottom surface that faces the inside of the package. The inner vertical wall is the side of the wall facing the inside of the package.

The invention begins with a rigid package that opens at the top.
At the end of the method, the rigid package is closed, for example, by folding and fastening (e.g., gluing or taping) the closure flaps of the box, or by installing a lid or covering.

Particulate materials, pastes or gels are industrial compounds. According to the invention, the particulate material, paste or gel is a compound requiring GHS and/or CLP labeling.

Flexible Packages Flexible packages are packages that are filled with particulate material, paste or gel. The flexible packaging preferably has the form of a bag, more preferably a plastic bag.

Plastic bags can be made from any plastic material suitable for making bags. A preferred material is polyethylene.
The plastic bag can have any suitable form. For example, the plastic bag may be a square bottom or round liner bag or a sleeve-like bag sewn at the bottom.
The outer bottom surface of a filled flexible package is defined as the portion of the bag that will contact the inner bottom surface of the rigid package when placed inside the rigid package.

One-component adhesive (also called one-component adhesive)
The adhesive layer present on the inner bottom surface or vertical wall of the rigid package can be a one-component adhesive.
The one-component adhesive is preferably a pressure sensitive adhesive (PSA), i.e., bonding is effected by contacting the adhesive film to the substrate (i.e., filled flexible packaging) and applying pressure. It is the adhesive that forms. Pressure sensitive adhesives do not set to form a solid material, but remain tacky. As a result, the pressure sensitive adhesive remains permanently tacky. Pressure sensitive adhesives are typically formulated from elastomers (e.g. natural rubbers, vinyl ethers, acrylics, butyl rubbers, styrenic block copolymers, silicones, nitriles, or chemically modified forms thereof) and optionally tackifiers (e.g. , terpenes, aromatic resins, hydrogenated hydrocarbon resins, or terpene phenolic resins).

In a preferred embodiment, the adhesive is a removable or temporary adhesive, i.e. a pressure sensitive adhesive that forms a temporary bond that can be removed after a relatively long period of time without leaving a residue on the adhesive. is an agent.

A pressure sensitive adhesive is applied to at least a portion of the inner bottom surface or inner vertical wall.

In preferred embodiments, a pressure sensitive adhesive is applied to at least a portion of the inner bottom surface.

In this embodiment, a pressure sensitive adhesive may also be applied to at least a portion of the inner vertical wall if desired.

The adhesive is applied in liquid form, for example, as a solution in an organic solvent, as an aqueous dispersion, or as a hot melt. Liquefied adhesives can be sprayed, roll coated, swirled, painted, or applied by glue gun.
In preferred embodiments, the one-component adhesive is a hot melt PSA. Hot melt PSAs are typically based on styrene block copolymers or (chemically modified) ethylene copolymers or homopolymers, optionally formulated with oils, plasticizers, and tackifiers. . Even more preferably, the one-component adhesives are removable hot melt pressure sensitive adhesives (HMPSA) because these adhesives can be easily peeled off without leaving a residue. It is from.

The adhesive may also have the form of a double-sided tape, although this is less preferred as it can be difficult to remove after use without leaving an adhesive layer on the rigid wrapper.

A one-component adhesive is preferably applied to the inner bottom surface or vertical wall after the rigid package has been assembled or opened. The adhesive may be applied in various patterns, preferably in large contact areas.

In preferred embodiments, the flexible and rigid wrappers can be separated after use by applying only a small tearing force, so that the flexible and rigid wrappers can be disposed of separately. This can be accomplished by applying the adhesive in a swirl or swirl pattern. Provided it is chemically uncontaminated, the rigid packaging can be reused, recycled or disposed of as (paper or plastic) waste. Flexible packaging may be considered chemical waste and may require different handling.

Two-component adhesive (also called two-component adhesive)
An adhesive layer present on the inner bottom surface or vertical wall of the rigid package may constitute the first component of the two-component adhesive. The first component can be applied after the rigid package has been assembled or opened, but the first component can also be applied during manufacture of the rigid package or to the unfolded box.
An advantage of this embodiment is that the first component will only stick to the second component and not to other substrates, so that the box containing the layers of the first component is , can be easily folded, unfolded and stacked without sticking together.
The first component can be sprayed, printed, roll coated, dip coated, swirled, painted, or applied by glue gun.
The first component is preferably applied to at least a portion of the inner bottom surface of the rigid wrapper.

A second component of adhesive is applied to the outside of the flexible wrapper, preferably to the outer bottom surface. The second component can be applied by spraying, printing, roll coating, dip coating, swirling, painting, or using a glue gun.
This second component will only stick to the first component and will not stick to other flexible packages so that the flexible packages can be easily stacked without sticking together. can be done. Placing the filled flexible wrapper on top of the first component layer of the rigid wrapper combines the two components, thereby adhering the wrapper.

The two-component adhesive is preferably a pressure sensitive adhesive, more preferably a removable pressure sensitive adhesive.

The two components should be applied to the flexible and rigid wrappers in a pattern that ensures a large enough contact area between the two components after insertion of the flexible wrapper.

In preferred embodiments, the flexible wrapper and rigid wrapper can be easily pulled apart after use so that they can be disposed of separately. Rigid packaging may be reused, recycled or disposed of as (paper or plastic) waste, flexible packaging may be considered chemical waste, provided that it is not chemically contaminated; Different handling may be required.

Hook-and-Loop In a further embodiment, the adhesive layer constitutes one side of one or more hook-and-loop fasteners (e.g., Velcro) adhered to the bottom or vertical wall of a rigid package, said fastener(s) The facing surface of the is adhered to the outside of the flexible wrapper. Preferably, one side of the hook-and-loop fastener(s) is adhered to the inner bottom surface of the rigid wrapper and the opposite side(s) is adhered to the outer bottom surface of the flexible wrapper.
The hook-and-loop fastener(s) can be attached by an adhesive layer on the back of the hook-and-loop fastener(s). Placing the filled flexible wrapper into the rigid wrapper brings the two surfaces together, thereby adhering the wrapper.
However, a disadvantage of this embodiment is that one side of the hook-and-loop fastener(s) may remain attached to the rigid wrapper, thereby reducing the potential for recycling or Complicating things.

The two sides of the hook-and-loop fastener(s) should be applied to the flexible and rigid wrappers in a pattern that ensures a large enough contact area between the two sides after insertion of the flexible wrapper. be.

Particulate Material The particulate material preferably has the form of powders, granules, (small) pearls, beads, flakes or crystals and can have any suitable shape. The particulate material is preferably flowable, meaning that the particulate material does not stick together to form clumps.

Paste A paste according to the invention consists of a suspension of granular material in a fluid as a matrix for the granular material. The paste behaves as a solid until stress is applied, at which point it flows like a fluid. Pastes exhibit this behavior at room temperature.

Gels According to the present invention, gels represent viscoelastic fluids that do not behave as ideal liquids. Gels exhibit this behavior at room temperature.

Examples of compounds requiring GHS and/or CLP labeling are solid initiators and initiator blends. Other examples are materials added to the polymer as anti-static, anti-skid, anti-fog or anti-tack agents. These materials are generally based on glycerol esters, ethoxylated amines, aliphatic amines, or aliphatic amides and are often dispersed in a polymer matrix.
Further examples are carbon black, flame retardants, fatty alcohol esters, and polymeric esters of long chain alcohols.

Examples of initiators are organic peroxides, azides, and CC initiators. Initiator formulations include initiators compounded on solid inorganic carriers and masterbatches of initiators dispersed in a polymer matrix.

Specific examples of solid initiators are dicumyl peroxide, di(tert-butylperoxyisopropyl)benzene, dicetylperoxydicarbonate, dimyristylperoxydicarbonate, dilauroyl peroxide, di(4-tert-butylcyclohexyl)peroxy dicarbonate, didecanoyl peroxide, dibenzoyl peroxide, 2,2′-azobis(isobutyronitrile), 2,2′-azobis(2-methylbutyronitrile), 1,1′-azo(di(hexa hydrobenzonitrile), and 2,3-dimethyl-2,3-diphenylbutane.

Examples of solid initiator formulations are those comprising (i) a solid or liquid organic peroxide, azide, or CC initiator, and (ii) a solid desensitizer.

Examples of suitable desensitizing agents are solid inorganic carriers (eg calcium carbonate, silica, clay), polymeric (eg polypropylene) matrices, and solid organic desensitizing agents (eg dicyclohexyl phthalate or glycerol tribenzoate).

Examples of organic peroxides that can be combined with solid desensitizers are dibenzoyl peroxide, di(4-methylbenzoyl)peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3,2, 5-dimethyl-2,5-di(tert-butyl)hexane, tert-butylcumyl peroxide, di(tert-butylperoxyisopropyl)benzene, dicumylperoxide, butyl 4,4-di(tert-butylperoxy)valerate , 1,1-di(tert-butylperoxy)-3,3,5-trimethylcyclohexane, tert-butylperoxybenzoate, di(4-tert-butylcyclohexyl)peroxydicarbonate, and 3,6,9-triethyl- 3,6,9-trimethyl-1,4,7-triperoxanone.

Method A flexible package is filled with a particulate material, paste or gel, and then the filled flexible package is brought into contact with an adhesive layer present inside a rigid package, thereby removing the filled flexible package. The outer side of the flexible package, optionally containing the second component of the two-component adhesive or the opposing surface of the hook-and-loop fastener(s), is brought into contact with the adhesive layer, thereby turning the flexible package into a rigid one. Adhere to the package.

In a preferred embodiment, the adhesive layer is present on the inner bottom surface of the rigid wrapper, whereby the bottom surface of the filled flexible wrapper, optionally the second component of a two-component adhesive or hook-and-loop fastener. The bottom surface containing the facing surface(s) is contacted with the adhesive layer, thereby adhering the bottom surface of the flexible wrapper to the bottom surface of the rigid wrapper.

During filling, the flexible wrapper may be outside the rigid wrapper or the flexible wrapper may be (partially) inside the rigid wrapper. If filled while (partially) inside a rigid package, the weight increase caused by the filling will result in the pressure required to adhere the flexible and rigid packages together. Become. However, it should be ensured that the flexible and rigid packages do not stick together before filling.

After filling, the flexible package is closed, eg, sealed or closed with closure tape. A rigid package containing a closed flexible package is closed, for example by folding a flap or placing a cover.

The outer wall(s) of the rigid package can be marked with required information regarding chemical content and safety. The indication can be applied before, during or after the method of the invention.

The following items are part of this invention.
Item 1. 1. A method of packaging a particulate material, paste or gel or manufacturing a packaged product in which the particulate material, paste or gel is packaged, comprising:
- providing a rigid packaging having a bottom surface, a top surface and vertical walls, said rigid packaging being open at the top surface and containing an adhesive layer on at least part of the inner bottom surface or the inner vertical wall; step,
- filling the flexible packaging with particulate material;
- contacting the filled flexible packaging with an adhesive layer, thereby adhering the flexible packaging to the rigid packaging;
- A method comprising the step of closing a rigid package.
2. A method according to item 1, wherein the adhesive layer is on at least part of the inner bottom surface of the rigid wrapper.
3. 3. A method according to item 1 or 2, wherein the adhesive layer is a one-part adhesive.
4. 3. Method according to item 2, wherein the adhesive layer constitutes a first component of a two-part adhesive and a second component of said adhesive is on the outer bottom surface of the bag.
5. An adhesive layer constitutes one side of at least one hook-and-loop fastener adhered to the inner bottom surface of the box or cylindrical container, and the opposite surface of said at least one fastener is adhered to the outer bottom surface of said bag. , item 2.
6. A method according to any one of the preceding items, wherein the rigid packaging is a box or a cylindrical container, preferably made of cardboard or fibreboard.
7. A method according to any one of the preceding items, wherein the flexible packaging is a bag, preferably made of plastic.
8. A method according to any one of the preceding items, wherein the particulate material is a compound requiring GHS and/or CLP labeling.
9. 9. The method of item 8, wherein the compound is an organic peroxide or an organic peroxide formulation.
10. A method according to any one of the preceding items, wherein the adhesive is a pressure sensitive adhesive (PSA).
11. 11. The method of item 10, wherein the adhesive is a hot melt pressure sensitive adhesive (HMPSA).

Claims (11)

1. A method of manufacturing a packaged product in which a particulate material, paste or gel is packaged, said method comprising:
- providing a rigid package having a bottom surface, a top surface and vertical walls, said rigid package opening at said top surface and an inner bottom surface on the side facing the inside of said package at said bottom surface; or containing an adhesive layer on at least a portion of the inner vertical wall on the side of the vertical wall facing the inside of the package;
- filling the flexible packaging with particulate material, paste or gel;
- contacting said filled flexible packaging with said adhesive layer, thereby adhering said flexible packaging to said rigid packaging, said flexible packaging and said rigid packaging; , the flexible wrapper is not adhered prior to filling;
- including the step of closing said rigid packaging;
A method, characterized in that said particulate material, paste or gel is a compound requiring GHS and/or CLP labeling. 2. The method of claim 1, wherein the adhesive layer is on at least a portion of the inner bottom surface of the rigid wrapper. 3. A method according to claim 1 or 2, wherein the flexible packaging is a bag. The method according to any one of claims 1 to 3, wherein the adhesive layer is a one-component adhesive. The adhesive layer of the rigid package forms a first component of a two-component adhesive, and the second component of the two-component adhesive is present on the outer bottom surface of the flexible package . Item 4. The method according to any one of items 1 to 3 . The adhesive layer constitutes one surface of at least one hook-and-loop fastener adhered to the inner bottom surface of the rigid package , and the opposite surface of the at least one fastener is the outer bottom surface of the flexible package. 5. The method of claim 4, wherein the method is adhered to a A method according to any preceding claim, wherein the rigid packaging is a box or cylindrical container. 2. The method of claim 1, wherein said compound is an organic peroxide or organic peroxide formulation. A method according to any preceding claim, wherein the adhesive in the adhesive layer is a pressure sensitive adhesive (PSA). 10. The method of claim 9, wherein the adhesive in the adhesive layer is a hot melt pressure sensitive adhesive (HMPSA). A method of packaging a particulate material, paste or gel, said method comprising:
- providing a rigid package having a bottom surface, a top surface and vertical walls, said rigid package opening at said top surface and an inner bottom surface on the side facing the inside of said package at said bottom surface; or containing an adhesive layer on at least a portion of the inner vertical wall on the side of the vertical wall facing the inside of the package;
- filling the flexible packaging with particulate material, paste or gel;
- contacting said filled flexible packaging with said adhesive layer, thereby adhering said flexible packaging to said rigid packaging, said flexible packaging and said rigid packaging; , the flexible wrapper is not adhered prior to filling;
- including the step of closing said rigid packaging;
A method, characterized in that said particulate material, paste or gel is a compound requiring GHS and/or CLP labeling.