BR112021011230A2 - Method for packaging particulate material, paste or gel - Google Patents

Abstract

METHOD FOR PACKAGING MATERIAL PARTICULATE, PASTE OR GEL. It is a method of packaging a particulate matter, paste or gel, said method involving the steps of: (i) providing a rigid package that has a bottom, a top, and a vertical wall, said rigid package being open at the top and contains an adherent layer on at least part of the inner bottom or internal vertical wall, (ii) filling a flexible package with particulate matter, paste or gel, (iii) place the flexible packaging filled in contact with the adherent layer, adhering, through same, flexible packaging to rigid packaging, (iv) closing the packaging rigid.

Description

METHOD FOR PACKAGING PARTICULATE MATERIAL, PASTE OR GEL

[001] The invention relates to a method for packaging a particulate material, paste or gel, more particularly a chemical for solid industrial use.

[002] Many particulate chemical compounds, including pure solid peroxides, solid peroxide formulations, and polymer additives, are packaged in flexible packaging, such as a (plastic) wrapper, which is later packaged in more rigid packaging, such as a box (cardboard or fiberboard) or drum (fiber). The wrapper is the primary packaging; the carton or drum is the shipping packaging.

[003] Packaging technology generally shows a wide range of performance requirements. Depending on the goods to be packaged, the packaging must fulfill a wide variety of properties. In addition to the mechanical strength of the packaging materials, the ease or strength of opening, the options for dispensing, ie pouring, aspiration or sorting, as well as the type of labeling are under permanent technical development.

[004] The field of retail packaging, particularly food packaging, has a focus on sealing goods and facilitating dispensing of packaged goods. Liquids are often contained in plastic and glass jars, bottles and tubes, as well as plastic and paper bags, including small wrappers, envelopes, or stick packs.

[005] WO 2017/135927 A1 relates, for example, to a "wrap-in-box" package with a flattened void. Packaging is provided for liquid or flow products contained in a thermoplastic casing that is enclosed or enclosed within a relatively rigid outer carton or carton. The package is equipped with an access port at the top of the box for inserting a rigid implement, such as, for example, a drinking straw, which is pierced through the thermoplastic casing to gain access to the inner good.

[006] Completely different requirements are addressed in the packaging of goods, which require certificates, for example, for security reasons, in the following goods designated as certificates. These goods may require certificates, for example, on the grounds that they are dangerous goods. The way to gain access to the asset must be secure. The packaging must be provided with a label. Labeling is associated with strict legal requirements.

[007] The box disclosed in WO 2017/135927 A1 is not suitable for packaging certified goods, particularly if the certified goods represent particulate materials, pastes or gels. Goods certified in these forms are often dumped after removing a sealing strip at the top of the package. In case a package is provided with an access door, in accordance with the present state of the packaging technique, and in case the access door is perforated, the certified goods come into contact with air and humidity, which is harmful to goods certificates or that may even infringe legal requirements. Packaging of this type is not suitable for packaging certified goods.

[008] The United Nations Globally Harmonized Chemicals Classification and Labeling System (GHS), implemented by the EU as the

Classification, Labeling and Packaging of Substances and Mixtures (CLP Regulation), requires that information regarding the contents and safety of chemicals be both on the primary packaging and on the outside of the shipping packaging. The GHS and CLP also require that this information be provided in the languages of all countries in which the product is sold.

[009] Once a certain product is reclassified or the product will be sold to a new country or amended regulations require different or additional information, all stock of pre-printed wrappers needs to be replaced with new wrappers that contain the additional or amended information. .

[010] A potential solution to the present problem will be the manual labeling of wrappers instead of pre-printing them. However, it is an unattractive job that requires employees to be able to understand the label and the link to the product.

[011] Therefore, it is an object of the present invention to provide a way of packaging dangerous goods that solves the present problem.

[012] The solution is provided by attaching the flexible packaging to the inner side of the rigid packaging, so that the combination packaging is considered the primary packaging and only the outer side of the combination packaging needs to be labelled.

[013] The present invention therefore relates to a method for packaging a particulate material, paste or gel, said method involving the steps of: - providing a rigid package, which has a bottom,

the top and a vertical wall, said rigid packaging being open at the top and containing an adherent layer on at least part of the inner bottom or inner vertical wall, - filling a flexible packaging with particulate material, paste or gel, - placing the flexible packaging filled in contact with the adherent layer, adhering, through it, the flexible packaging to the rigid packaging, - closing the rigid packaging, in which the particulate material, paste or gel is a chemical compound that requires GHS labeling and /or CLP labeling.

[014] It is preferable that a particulate material is packaged. Therefore, in a preferred embodiment, the present invention relates to a method for packaging a particulate material, said method involving the steps of: - providing a rigid package, which has a bottom, a top and a wall vertical, said rigid package being open at the top and containing an adherent layer on at least part of the internal bottom or internal vertical wall, - filling a flexible package with particulate material, - placing the filled flexible package in contact with the layer adherent, adhering, by means of it, the flexible packaging to the rigid packaging, - closing the rigid packaging, in which the particulate material is a chemical compound that requires GHS and/or CLP labeling.

THE RIGID PACKAGING

[015] Rigid packaging must be rigid enough to maintain its shape during transport, storage and handling.

[016] It is preferable that it has a cylindrical, cubic or cuboid shape.

[017] The rigid packaging is preferably a box, drum, crate or bucket.

[018] It is preferable that it is produced from cardboard (corrugated), fiberboard or plastic material.

[019] Rigid packaging has a bottom, a top and a vertical wall. The vertical wall of cubic or cuboid shaped packages consists of four side walls. The vertical wall of packages with a cylindrical shape is the cylindrical wall.

[020] The inner bottom is the side of the bottom facing the inner side of the package. The vertical inner wall is the side of the wall facing the inner side of the package.

[021] The method of the invention begins with a rigid package, open at the top.

[022] At the end of the method, the rigid package is closed, for example, by folding and fixing (for example, by gluing or stapling) the closing flaps of the box or by positioning a lid or roof.

[023] The particulate matter, paste or gel is an industrial chemical compound. According to the invention, the particulate material, paste or gel is a chemical compound that requires GHS and/or CLP labeling.

THE FLEXIBLE PACKAGING

[024] Flexible packaging is packaging that is filled with particulate material, paste or gel. It is preferred that it is in the form of a housing, more preferably a plastic housing.

[025] The plastic casing can be produced from any plastic material suitable for making casings. A preferred material is polyethylene.

[026] The plastic casing can be of any suitable shape. For example, it may be a block bottom or round liner casing or a sleeve-like casing with a visible bottom.

[027] The external bottom of the filled flexible packaging is defined as the part of the wrapper that, once positioned inside the rigid packaging, comes into contact with the internal bottom of the rigid packaging.

SINGLE COMPONENT ADHESIVE

[028] The adhesive layer that is present on the inner bottom or vertical wall of the rigid package may be a single component adhesive.

[029] The present single component adhesive is preferably a pressure sensitive adhesive (PSA), i.e., an adhesive that forms a bond by placing the adhesive film in contact with the substrate (i.e., the filled flexible package) and applying pressure. Pressure-sensitive adhesives do not solidify to form a solid material, but remain viscous. As a result, they remain permanently sticky.

[030] Pressure sensitive adhesives are typically formulated from elastomers (e.g. natural rubber, vinyl ethers, acrylics, butyl rubber, styrene block copolymers, silicones,

nitriles or modified chemical forms thereof), optionally including a tackifier (e.g. terpenes, aromatic resins, hydrogenated hydrocarbon resins, or terpenophenol resins).

[031] In a preferred embodiment, the adhesive is a removable or fugitive adhesive, that is, a pressure sensitive adhesive that forms a temporary bond that can be removed after relatively long periods of time without leaving a residue on the adherent.

[032] The pressure sensitive adhesive is applied to at least part of the internal bottom or internal vertical wall.

[033] In a preferred embodiment, the same is applied to at least part of the internal fund. In the present embodiment, it can be additionally applied to at least part of the internal vertical wall, if desired.

[034] The adhesive is applied in a liquid form, for example, as a solution in an organic solvent, as an aqueous dispersion or as a molten adhesive. The liquefied adhesive can be sprayed, roller coated, swirled, painted or applied with a glue gun.

[035] In a preferred embodiment, the single component adhesive is a PSA melt adhesive. PSA melt adhesives are typically based on styrene block copolymers or ethylene co- or homopolymers (chemically modified), optionally formulated with oils, plasticizers, and tackifiers. Even more preferably, the single component adhesive is a pressure sensitive removable melt adhesive (HMPSA), as the same adhesives can be easily peeled off without leaving residue.

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

[037] The single-component adhesive is preferably applied to the internal bottom or vertical wall after the rigid packaging is laid out or opened. The adhesive can be applied in various patterns, preferably so that a large area of contact is obtained.

[038] In a preferred embodiment, the rigid and flexible packaging can be separated after use by applying only a little tearing force, so that they can be disposed of separately. The same can be accomplished by applying the adhesive in a spiral or swirl pattern. Rigid packaging can be reused, recycled or disposed of as waste (paper or plastic) as long as it is not chemically contaminated. Flexible packaging can be considered chemical waste and may require different handling.

TWO COMPONENT ADHESIVE

[039] The adhesive layer that is present on the inner bottom or vertical wall of the rigid package may constitute the first component of a two-component adhesive. The present component can be applied after disposing or opening the rigid package, but can also be applied during the manufacture of the rigid package or in unfolded boxes.

[040] The advantage of the present embodiment is that the first component will only bond to the second component and not to other substrates, so that boxes containing a layer of the first component can be easily folded, unfolded and stacked without agglutinating one in the other.

[041] The first component can be sprayed, printed, roll coated, dip coated, swirled, painted or applied with a glue gun.

[042] The first component is preferably applied to at least part of the inner bottom of the rigid package.

[043] The second component of the adhesive is applied on the external side of the flexible packaging, preferably on the external bottom. It can be applied by spraying, printing, roll coating, dip coating, swirling, painting or using a glue gun.

[044] The second component will only bond to the first component and not to other flexible packaging, so that flexible packaging can be easily stacked without agglutinating one to the other.

[045] Positioning the flexible packaging filled in the layer of the first component in the rigid packaging will combine the two components, adhering, through it, to the packaging.

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

[047] The two components must be applied to both rigid and flexible packaging in a pattern that ensures a sufficiently large contact area between the two components after insertion of the flexible packaging.

[048] In a preferred embodiment, flexible packaging and rigid packaging can be easily separated after use, so that they can be disposed of separately. Rigid packaging can be reused, recycled or disposed of as waste (paper or plastic) as long as it is not chemically contaminated; flexible packaging can be considered chemical waste and may require different handling.

HOOK AND LOOP STRIP

[049] In an additional embodiment, the adherent layer constitutes a part of one or more hook and loop strips (eg Velcro) adhered to the bottom or vertical wall of the rigid package; the opposite part of said strip(or strips) being adhered to the outside of the flexible package. Preferably, a part of the hook and loop strip (or hook and loop strips) is/are adhered to the inner bottom of the rigid package and the opposite part (or opposite parts) is/are adhered to the outer bottom of the flexible package.

[050] The strip(or strips) can be applied through an adhesive layer on the backside of the hook and loop strip(or hook and loop strips).

[051] Positioning the filled flexible packaging in the rigid packaging will combine the two parts, adhering, through it, to the packaging.

[052] The disadvantage of the present embodiment is, however, that a part of the strip (or strips) can remain fixed to the rigid packaging, reducing or complicating the possibilities of recycling.

[053] The two parts of the hook and loop strip (or hook and loop strips) shall be applied to the rigid and flexible packaging in such a pattern that a sufficiently large contact area between the two parts is guaranteed after insertion of the flexible packaging .

THE PARTICULATE MATERIAL

[054] The particulate material preferably is in the form of powder, granules, (mini) pearls, capsules, flakes or crystals, and can be of any suitable shape. The particulate material is preferably free-flowing, that is, it does not clump together to form shapeless masses.

THE FOLDER

[055] The paste, according to the invention, consists of a suspension of granular material in a fluid as the matrix to the granular material. The paste behaves like a solid until tension is applied, at which point it flows like a fluid. The paste exhibits the present behavior at room temperature.

the GEL

[056] According to the invention, the gel represents a viscoelastic fluid that does not behave like an ideal liquid. The gel exhibits the present behavior at room temperature.

[057] Examples of compounds that require GHS and/or CLP labeling are solid initiators and initiator formulations.

[058] Other examples are materials that are added to polymers as anti-static, anti-slip, anti-fog or anti-block agents. The same materials are generally based on glycerol esters, ethoxylated amines, fatty amines or fatty amides, often dispersed in a polymer matrix.

[059] Additional examples are carbon black, flame retardants, fatty alcohol esters and polymeric esters of long chain alcohols.

[060] Examples of initiators are organic peroxides, azides and C-C-initiators. Initiator formulations include initiators formulated in solid inorganic carriers and master batches of initiators dispersed in a polymer matrix.

[061] Specific examples of solid initiators are dicumyl peroxide, di(tert-butylperoxyisopropyl)benzene, dicetyl perperoxydicarbonate, dimystyryl peroxydicarbonate, dilauroyl peroxide, di(4-tert-butylcyclohexyl)peroxydicarbonate, peroxide of didecanoyl, dibenzoyl peroxide, 2,2'-azobis(isobutyronitrile), 2,2'-azobis(2-methylbutyronitrile), 1,1'-azo(di(hexahydrobenzonitrile), and 2,3-dimethyl-2 ,3-diphenylbutane.

[062] Examples of solid initiator formulations are formulations comprising (i) a solid or liquid organic peroxide, azide or C-C-initiator and (ii) a solid phlegmatizer.

[063] Examples of suitable phlegmatizers are solid inorganic carriers (e.g. calcium carbonate, silica, clay), polymer matrices (e.g. polypropylene) and solid organic phlegmatizers (e.g. dicyclohexyl phthalate or glycerol tribenzoate) .

[064] Examples of organic peroxides that can be formulated with solid phlegmatizers are dibenzoyl peroxide, di(4-methylbenzoyl)peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexine-3, 2,5 -dimethyl-2,5-di(tert-

butyl)hexane, tert-butyl cumyl peroxide, di(tert-butylperoxy isopropyl)benzene, dicumyl peroxide, butyl 4,4-di(tert-butylperoxy)valerate, 1,1-di(tert-butylperoxy-3,3, 5-trimethylcyclohexane, tert-butyl peroxybenzoate, di(4-tert-butyl cyclohexyl)peroxy dicarbonate, and 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxane.

THE METHOD

[065] The flexible packaging is filled with particulate material, paste or gel and the filled flexible packaging is then placed in contact with the adherent layer that is present inside the rigid packaging, thus coming into contact with the outside. - optionally containing the second component of a two-component adhesive or the opposite part of the hook-and-loop strip (or hook-and-loop strips) - of the flexible package filled with the adherent layer, and thereby adhering to the package flexible to rigid packaging.

[066] In a preferred embodiment, the adherent layer is present on the inner bottom of the rigid package, then in contact with the bottom - optionally containing the second component of a two-component adhesive or the opposite part of the hook and loop strip. loop (or hook-and-loop strips) - of the flexible packaging filled with the adherent layer, and adhering, through it, the bottom of the flexible packaging to the bottom of the rigid packaging.

[067] During filling, the flexible packaging may be outside the rigid packaging, or it may be (partially) inside the rigid packaging. If filled while (partially) inside the rigid package, the increased weight caused by the filling will cause the pressure required to adhere the rigid and flexible packages. It must, however, be ensured that rigid and flexible packaging do not stick together before filling.

[068] After filling, the flexible packaging is closed, for example, sealed or closed with a closing strip.

[069] The rigid package that contains the closed flexible package is closed, for example, by folding flaps or positioning a cover.

[070] The outer wall (or outer walls) of the rigid packaging can be labeled with the required information regarding chemical content and safety. The label can be applied before, during or after the method of the invention.

[071] The following items are part of the invention:

[072] Items:

1. Method for packaging a particulate material, said method involving the steps of: - providing a rigid package, which has a bottom, a top and a vertical wall, said rigid package being open at the top and containing a adherent layer on at least part of the internal bottom or internal vertical wall, - fill a flexible package with particulate material, - place the filled flexible package in contact with the adherent layer, thereby adhering the flexible package to the rigid package , - close the rigid packaging.

2. Method according to item 1, wherein the adherent layer is in at least part of the inner bottom of the rigid package.

3. Method according to item 1 or 2, wherein the adherent layer is a single component adhesive.

4. method according to item 2, wherein the adherent layer constitutes the first component of a two-component adhesive; the second component of said adhesive being present at the outer bottom of the wrapper.

5. Method according to item 2, wherein the adherent layer forms a part of at least one hook and loop strip adhered to the inner bottom of the box or drum; the opposite part of said at least one strip being adhered to the outer bottom of the casing.

6. Method according to any one of the preceding items, wherein the rigid package is a box or drum, preferably produced from cardboard or fiberboard.

7. Method according to any one of the preceding items, wherein the flexible package is a wrapper, preferably produced from plastic.

8. Method according to any of the foregoing items, wherein the particulate matter is a chemical compound that requires GHS and/or CLP labeling.

9. The method of item 8, wherein the chemical is an organic peroxide or organic peroxide formulation.

10. Method according to any of the foregoing, wherein the adhesive is a pressure sensitive adhesive (PSA).

11. Method according to item 10, wherein the adhesive is a pressure-sensitive melt adhesive (HMPSA).

Claims (10)

1. METHOD FOR PACKAGING A PARTICULATE MATERIAL, PASTE OR GEL, said method involving the steps of: - providing a rigid packaging, which has a bottom, a top and a vertical wall, said rigid packaging being opened in the top and contains an adherent layer on at least part of the inner bottom or inner vertical wall, - fill a flexible package with particulate material, paste or gel, - place the filled flexible package in contact with the adherent layer, adhering, by means of same, flexible packaging to rigid packaging, - closing the rigid packaging, characterized in that particulate material, paste or gel is a chemical compound that requires GHS and/or CLP labeling. 2. METHOD, according to claim 1, characterized in that the adherent layer is in at least part of the inner bottom of the rigid package. 3. METHOD according to any one of claims 1 or 2, characterized in that the adherent layer is a single component adhesive. 4. METHOD according to claim 2, characterized in that the adherent layer constitutes the first component of a two-component adhesive; the second component of said adhesive being present at the outer bottom of the wrapper. 5. METHOD, according to claim 2, characterized in that the adhesive layer constitutes a part of at least one hook and loop strip adhered to the inner bottom of the box or drum; the opposite part of said at least one strip being adhered to the outer bottom of the casing. 6. METHOD, according to any one of claims 1 to 5, characterized in that the rigid packaging is a box or drum, preferably produced from cardboard or fiberboard. 7. METHOD according to any one of claims 1 to 6, characterized in that the flexible package is a wrapper, preferably produced from plastic. 8. METHOD according to claim 1, characterized in that the chemical compound is an organic peroxide or an organic peroxide formulation. 9. METHOD according to any one of claims 1 to 8, characterized in that the adhesive is a pressure sensitive adhesive (PSA). 10. METHOD, according to claim 9, characterized in that the adhesive is a pressure sensitive melt adhesive (HMPSA).