1704 results about "Pack material" patented technology

A system includes a fluid end having a fluid end face and a recess extending toward a base. The system also includes a pressure ring extending from the fluid end face, the pressure ring having a pressure ring bore diameter larger than a fluid end bore diameter. The system further includes an adjacent ring coupled to the fluid end, the pressure ring positioned between the adjacent ring and the base, wherein at least one fastener extends through an aperture of the adjacent ring to couple the adjacent ring to the fluid end. The system includes packing material positioned within at least a portion of the pressure ring bore, the packing material positioned such that axial movement toward the fluid end is blocked by the base.

The invention discloses a double-PHA barrier system for a paper-based container and a paperboard as well as a preparation method and application of the double-PHA barrier system, and belongs to the technical field of paper-based material surface engineering and green packaging. The system sequentially comprises a paper base material, a water-based PHA dispersion hole sealing layer and a PHA extrusion compact layer from inside to outside. According to the invention, the micron-sized PHA dispersoid without cell debris is utilized, so that an efficient hole sealing effect which is difficult to achieve by a high coating amount in a traditional process can be achieved by only needing an extremely low coating amount, and the pinhole defect of an extrusion layer is eliminated from the source. And in cooperation with the modified PHA extrusion layer with the specific crystallinity, the problem of micro-cracking of a single coating during edge rolling forming is cooperatively solved. According to the system, excellent barrier performance is achieved through a thinner bio-based structure, and meanwhile the system has a wide heat sealing window and excellent repulp recycling performance. Compared with the prior art, on the premise that high performance is guaranteed, the consumption amount of packaging materials and the environmental burden are remarkably reduced.

The invention provides a packaging material intelligent selection method and system based on multi-dimensional data analysis, and relates to the field of material management. Vibration, deformation and temperature and humidity data are collected in real time through an environment sensing module to construct a feature matrix; the data analysis module fuses the historical case library and the logistics task duration to predict the material life, and associates the supply chain inventory to generate residual life evaluation; the decision engine module dynamically distributes cost, safety and environmental protection weights, and combines the supplier credit score to generate a multi-level decision scheme; the execution control module verifies the dimensional tolerance of the material and drives replacement operation, and model calibration is triggered through a 5% deviation threshold value; a humidity sensitive material grading standard and a deformation safety limit value are built in the system, and when the temperature and humidity sudden change exceeds the threshold value, deformation quantity prediction and emergency scheme reconstruction are started; a three-level self-optimization mechanism of environmental perception error, material life error and execution error is established, and closed-loop optimization is realized through sensor calibration, supplier credit recalculation and dynamic adjustment of control parameters.

The invention discloses hot compress patch processing, pressing and bag sealing equipment, and relates to the technical field of hot compress patch processing, the hot compress patch processing, pressing and bag sealing equipment comprises a supporting mechanism and an anti-wrinkle mechanism, the supporting mechanism comprises a base, and two front supporting plates are jointly provided with a lower scrap removing mechanism and an upper scrap removing mechanism; and the two middle supporting plates are jointly and rotationally connected with two smoothing rollers which are distributed up and down, the two rear supporting plates are jointly provided with a preheating mechanism and an anti-wrinkle mechanism, and a press sealing machine is installed on the right portion of the top wall of the base. Through cooperation of the lower scrap removing mechanism and the upper scrap removing mechanism, the upper packaging material and the lower packaging material are cleaned, and the situation that dust and impurities adhere to the packaging materials, and follow-up press-fit packaging is affected is prevented; the upper scrap removing mechanism and the preheating mechanism are matched to preheat the packaging material, so that the possibility of generating bubbles and wrinkles at a sealing part is reduced; the preheating mechanism is matched with the anti-wrinkle mechanism, the packaging material is leveled, and wrinkles and bubbles are prevented from affecting the sealing quality and further affecting the sealing performance of the hot compress patch.

The invention relates to the technical field of research and development of BIB liquid packaging materials, and discloses a PE-PA-based composite film, a manufacturing process and an application in BIB liquid packaging, and specifically comprises the following steps: synthesizing a PE-PA compatilizer; the preparation method comprises the following steps: carrying out ring-opening reaction on an epoxy functional group of a PE-PA compatilizer and an amino functional group or a carboxyl functional group at a PA resin molecular chain end to prepare PE-PA compatilizer grafted nylon resin, and carrying out physical anchoring action on a long-chain alkane structure on the PE-PA compatilizer grafted nylon resin and a PE resin molecular chain to prepare the PE-PA alloy master batch; low-density polyethylene resin is used as a raw material of a supporting layer, PE-PA alloy master batch is used as a raw material of a functional layer, metallocene polyethylene resin is used as a raw material of a heat sealing layer, a three-layer co-extrusion blow molding film forming technology is adopted, the PE-PA composite film is prepared, and the film product is excellent in comprehensive performance and can be used for manufacturing a BIB bag body.

The invention relates to the technical field of package design, and discloses a package design intelligent optimization method and system, and the method comprises the steps: obtaining the size, physical characteristics, physical characteristic parameters and storage environment parameters of a to-be-stored article, and building a package design model based on the size, physical characteristic parameters and storage environment parameters; calculating packaging material thickness and environment regulation data according to the packaging design model, and determining constraint condition data; the maximum characteristic coefficient is judged according to the physical characteristic parameters, and the optimal characteristic parameters and the optimal physical characteristics are obtained; optimizing a packaging design model according to the optimal characteristic parameters and the optimal physical characteristics to obtain an optimal packaging model; packaging design parameters are obtained through calculation according to the optimal packaging model, optimization operation is conducted on the packaging design parameters according to the constraint condition data, and optimal design parameters are obtained; and taking the optimal design parameter as a package design target, and carrying out package design on the to-be-stored article. The method improves the packaging design efficiency.

The invention belongs to the technical field of packaging materials, and discloses a high-temperature-resistant heat-seal straw-pluggable easy-to-tear cover and a preparation method thereof.The body comprises a PET layer, a blocking layer and a PE layer which are sequentially compounded from outside to inside, the blocking layer is an AL layer, laser invisible pre-scribed lines are arranged on the easy-to-tear cover, the laser invisible pre-scribed lines only penetrate through the PET layer and the blocking layer and do not penetrate through the PE layer, the thickness of the PET layer ranges from 12 micrometers to 20 micrometers, and the thickness of the PE layer ranges from 12 micrometers to 20 micrometers. The barrier layer is an AL layer, the thickness of the AL layer is 7-12 microns, the thickness of the PE layer is 40-60 microns, and the PET layer is prepared from the following raw materials in parts by weight: 80-95 parts of PET resin, 5-10 parts of composite modified nano silicon dioxide, 3-6 parts of a heat stabilizer and 0.5-2 parts of a lubricant; the composite modified nano silicon dioxide is maleic anhydride grafted polybutadiene composite modified nano silicon dioxide, and the composite modified nano silicon dioxide is uniformly dispersed in a PET matrix by virtue of good compatibility with PET resin, so that the overall toughness and heat sealability of the easy-to-tear cover are remarkably enhanced.

The present invention relates to an apparatus (1) and a method for manufacturing a pouched product (201) for oral use. The present invention further relates to a pouched product (201) for oral use. The apparatus comprises a supplying unit (3) for supplying a filling material (5), a holding unit (7) for holding a piece (9) of tubular web of a saliva-permeable packaging material, the piece of tubular web having a predefinable length when provided to the holding unit, a transverse sealing unit (11) for providing the piece of tubular web with transverse seals (13) thereby forming a pouched product, and a separation unit (15) for separating the pouched product from a subsequent pouched product (201′) in or at the transverse seals. The holding unit comprises guiding provisions (17) for guiding the filling material from the supplying unit to be supplied into the piece of tubular web at an end (19) of the holding unit, wherein a length of the holding unit (Lh) is at least 35 cm.

The utility model discloses a soft package material feeding production line, which comprises a soft bag cutting device, a feeding device, a feeding device, a feeding device and a feeding device, wherein the soft bag cutting device is used for cutting a bag opening of a soft bag filled with materials; the material distributing and conveying line is used for conveying materials to a using station, and an inlet of the material distributing and conveying line is provided with a hopper which is obliquely arranged; and the first robot is used for feeding the soft bag at the positioning station into the soft bag cutting device, moving the soft bag with the bag opening being cut to the position above the hopper, pouring materials in the soft bag onto the hopper from the bag opening and enabling the materials to automatically slide to the material distribution conveying line along the hopper, and the positioning station is used for placing and positioning the soft bag to be opened. According to the soft package material feeding production line, the automatic feeding and automatic bag cutting functions of the soft bag cutting device can be achieved, the functions of automatic pouring out of materials in soft bags and automatic conveying of the materials can be achieved, manual bag opening, material pouring and material transferring can be avoided, automatic feeding of the soft package materials is achieved, the labor intensity of workers is reduced, and the production efficiency is improved. The labor cost is reduced, and the working efficiency is improved.

The invention relates to the technical field of packaging materials, and discloses a high-barrier multilayer co-extrusion composite film which sequentially comprises an inner layer, a first bonding layer, a first barrier layer, a second bonding layer, a second barrier layer, a third bonding layer and an outer layer from bottom to top. And the second barrier layer is a nano silicon dioxide modified polyvinyl alcohol layer. The two different barrier layers are arranged, the first barrier layer has a good barrier effect on gas, the second barrier layer has outstanding barrier performance on water vapor, and the two barrier layers have a synergistic effect, so that the comprehensive barrier performance of the composite film on oxygen, water vapor, peculiar smell and the like is remarkably improved, the shelf life of a packaged product can be effectively prolonged, and the packaging cost is reduced. According to the high-barrier film, the high-barrier property is ensured, the quality and the performance of a product are ensured, and the use of expensive materials and a complex production process is avoided and the production cost is reduced by reasonably selecting each layer of material and optimizing the structural design on the premise of ensuring the high-barrier property.

The invention discloses a bearing performance testing device and application in flexible freight bag production, and relates to the technical field of packaging material detection.The bearing performance testing device comprises a bearing frame, a hydraulic cylinder and a lifting assembly, the lifting assembly comprises a hollow base, a bearing plate and a lifting part, and the telescopic end of the hydraulic cylinder penetrates through the hollow base and is provided with a material pressing plate; according to the invention, the push plate intermittently and repeatedly impacts the outer side of the container bag, so that the problems of non-uniform density distribution, existence of a blind area and slope-shaped accumulation when materials are continuously conveyed into the container bag are solved, the conditions are consistent when a plurality of container bags are subjected to load-bearing performance test, the test result is more accurate, and the test efficiency is improved. By controlling the extension lengths of the first pushing part and the second pushing part, materials in the flexible freight bag are uniformly distributed in time according to the input amount of the materials in the flexible freight bag in the feeding process of the flexible freight bag, so that the gravity center of the flexible freight bag is adjusted in time.

A system includes a fluid end having a fluid end face and a recess extending toward a base. The system also includes a pressure ring extending from the fluid end face, the pressure ring having a pressure ring bore diameter larger than a fluid end bore diameter. The system further includes an adjacent ring coupled to the fluid end, the pressure ring positioned between the adjacent ring and the base, wherein at least one fastener extends through an aperture of the adjacent ring to couple the adjacent ring to the fluid end. The system includes packing material positioned within at least a portion of the pressure ring bore, the packing material positioned such that axial movement toward the fluid end is blocked by the base.

The invention belongs to the technical field of packaging materials, and particularly relates to a composite film paper material and a preparation method thereof. The composite film paper material comprises a composite film layer and a paper layer, the composite film layer is prepared from the following components in parts by weight: 60 to 70 parts of polylactic acid, 20 to 30 parts of polybutylene terephthalate adipate, 5 to 8 parts of polyether polyol, 5 to 8 parts of esterified hydrophobic fumed silica and 3 to 5 parts of quinoline; the preparation process of the esterified hydrophobic fumed silica comprises the following steps: stirring fumed silica and acetyl chloride, and drying to obtain the esterified hydrophobic fumed silica. The esterified hydrophobic fumed silica, the polylactic acid, the quinoline and the polyether polyol are mixed according to a scientific proportion, and the barrier property of the composite film paper material is remarkably improved by utilizing the hydrophobicity of the esterified hydrophobic fumed silica and a compact structure formed among the components, and meanwhile, the mechanical property of the composite film paper material is not influenced.

The invention belongs to the technical field of chemical packaging supervision, and particularly relates to a dangerous chemical packaging quality prediction method and system based on deep learning. The system comprises a packaging material scanning detection module, a packaging material judgment analysis module, a sealing integrity analysis module, a man-machine collaborative decision-making module, a packaging management detection evaluation module and a packaging supervision terminal. The packaging material scanning and detecting module is used for scanning and detecting the surface of the packaging material of the dangerous chemical, and the packaging material judging and analyzing module and the sealing integrity analyzing module are used for analyzing the surface condition and the sealing integrity of the packaging material, so that the packaging quality of the dangerous chemical is effectively monitored and accurately judged; a powerful guarantee is provided for safe transportation and storage of the dangerous chemicals, reasonable improvement measures are taken in time according to the packaging management performance of the dangerous chemicals through accurate evaluation, and subsequent packaging quality and packaging stability and high efficiency can be guaranteed.

According to the plate breaking mark and the cosmetic package, in the horizontal direction, the plate breaking mark is in a T shape; in the longitudinal direction, the board breaking marks are trapezoidal; the plate breaking mark is used for being carved on the back face of the base plate and used for bending and tearing the base plate. A thin film for storing a material body is adhered to the top surface of the base plate, and a plate breaking mark is arranged on the bottom surface of the base plate. The package is formed by compounding five layers of materials; by adopting a separate bin design, the original characteristics and effects of the materials can be kept fresh to the maximum extent; the multi-layer composite film can reduce the compatibility risk of a packaging material and a material body, and the high barrier property of the aluminum foil improves the compatibility between the packaging material and the material body and reduces the risk of product weight loss. Due to arc alignment between the material cavities, the stressed area of the vertical section of the partition is reduced, the pressure generated by extrusion inside the cavities is increased, and the two cavities can be communicated after being extruded; the sealing performance of the product before being bent is guaranteed through the T-shaped material opening and the bending track line on the back face, meanwhile, after the package is stressed and bent, the material body can flow out easily, and carrying and using are convenient.

A multilayer packaging material includes a substrate formed of a cellulosic fiber-based material. The substrate has a first major surface and a second major surface opposite the first major surface. An oxygen barrier layer is formed of a PVOH material attached to the substrate, wherein the oxygen barrier layer is an innermost layer of the multilayer packaging material and further wherein the oxygen barrier layer is heat sealable. At least one moisture barrier layer is attached to the substrate, the moisture barrier layer selected from an inner moisture barrier layer disposed intermediate the substrate and the oxygen barrier layer and an outer moisture barrier layer disposed on the second major surface of the substrate. In further aspects, a packaging article, a method for making a multilayer packaging material, and a method for packaging a product are provided.

The invention relates to a biaxially oriented casting polypropylene composite film and a preparation method thereof, and belongs to the technical field of packaging materials. The homo-polypropylene, the co-polypropylene, the slipping agent, the nucleating agent, the antioxidant and the modified nano silicon dioxide are used as raw materials to prepare the biaxially oriented casting polypropylene composite film which can be used in the field of food packaging and has high transparency and good antistatic performance and ultraviolet resistance. The nano silicon dioxide is modified, and the ultraviolet light absorber is grafted on the surface of the nano silicon dioxide, so that the problem that the nano silicon dioxide is easy to agglomerate is solved, and the problem that the ultraviolet light absorber is easy to migrate is also solved; through quaternary ammonium salt structure conjugation, the ultraviolet light absorber has better ultraviolet light absorption performance and antistatic performance.

Packaging methods include inserting an article into a virtual pouch defined by folding and tacking a first sheet of textile material. The first sheet is then folded about the article such that the first sheet encompasses the article. A second sheet of a textile material is then folded about the first sheet into a configuration such that the second sheet entirely envelops and encloses the first sheet and the textile article. The second folded sheet is then secured in the enveloping configuration. Alternatively, the article is wrapped in and encompassed by a first sheet of textile material by folding and the resulting package is then enclosed within a virtual pouch created in a second sheet of textile material. The resulting outer sheet enclosing the inner sheet with the textile article is then secured in its enclosing configuration with a strap. The packaging materials can be cleaned and decontaminated for reuse.

The invention relates to the technical field of packaging materials, in particular to a PE composite film for manufacturing a packaging bag and a preparation method of the PE composite film. The PE composite film comprises a lower antibacterial PE layer, a middle barrier PE layer and an upper antibacterial PE layer; the lower antibacterial PE layer is prepared from the following raw materials: low-density polyethylene, linear density polyethylene, an antibacterial functional agent, a tensile functional agent and an auxiliary agent; the middle barrier PE layer is prepared from the following raw materials: linear low-density polyethylene, metallocene low-density polyethylene, a tensile functional agent and an auxiliary agent; the upper antibacterial PE layer is prepared from the following raw materials: linear low-density polyethylene, metallocene low-density polyethylene, an antibacterial functional agent and an auxiliary agent, and the PE composite film for manufacturing the packaging bag, prepared by the invention, has excellent antibacterial property and excellent tensile mechanical property; the requirements on antibacterial property and tensile property in the field of packaging materials can be met.

The present invention relates to the technical field of high-temperature resistant cooking packaging materials, and discloses a high-barrier high-temperature resistant cooking packaging film based on a single recyclable PP material. The preparation method of the packaging film is as follows: vinylated phenyl double-clamped structure cage-type polyhedral oligomeric silsesquioxane is first compounded with graphene oxide through π-π stacking interaction and hydrogen bond interaction, and then loaded onto polypropylene resin through free radical coupling reaction and molecular chain intercalation method. Finally, a high-barrier polypropylene-based composite material with high temperature resistance and puncture resistance is obtained by extrusion using a twin-screw extruder; the high-barrier polypropylene-based composite material with high temperature resistance and puncture resistance is used as the intermediate layer raw material of a five-layer co-extruded film made of a single PP material, and a high-barrier high-temperature resistant cooking packaging film based on a single recyclable PP material is prepared by using a five-layer co-extrusion blow molding process. After being cooked at 140 °C for 30 minutes, the film product has no abnormal phenomena such as deformation and peeling, and has excellent barrier properties and puncture resistance.

The invention provides a packaging material pattern positioning method and device based on an optimized Loftr algorithm, and relates to the technical field of packaging materials, and the method comprises the steps: carrying out the multi-scale feature extraction of a packaging image, carrying out the coarseness matching of a coarseness feature, carrying out the matching point screening of a coarseness matching set through employing a PROSAC algorithm, and carrying out the positioning of a packaging material pattern. For each matching point in the screened matching prediction set, a local window is cut on the fine-grained feature map, the local window comprises context information around the current matching point, fine-grained matching is carried out on fine-grained features in the local window, geometric consistency screening is carried out on the basis of a fine-grained matching result, and a matching result is obtained; constructing and solving a homogeneous equation set according to the final matching point set, estimating a homography matrix, mapping a pattern area in the standard image to the packaging image according to the homography matrix, obtaining pattern positioning information of the packaging image, improving smooth transition from coarse-grained matching to fine-grained matching, and improving the precision of the packaging image. Therefore, the accuracy and robustness of feature matching are remarkably improved.

The utility model discloses a hoisting device for packaging materials, and relates to the technical field of hoisting equipment. The lifting device comprises a lifting frame, hydraulic cylinders are fixedly connected to the two sides of the top of the lifting frame, and movable plates are arranged on the two sides of the bottom of the lifting frame; a fixing assembly is arranged at the bottom of the lifting frame and comprises a supporting cylinder, and the supporting cylinder is fixed to one side of the movable plate. Through the arrangement of the fixing assembly, when the two sets of supporting barrels move relatively and are inserted into the coiled material barrel, the rubber air bag is extruded through the pressing plate, so that the rubber air bag is expanded and makes contact with the inner wall of the coiled material barrel, rotation of the coiled material barrel is limited through extrusion friction force of the rubber air bag on the wall of the coiled material barrel, and the stability during lifting is improved; and through the arrangement of the limiting assembly, a pressing rod can be rotated, so that the pressing rod makes contact with the surface of the coiled material barrel, pressure is applied to the coiled material barrel, the effect of fixing the coiled material is achieved, and the stability during hoisting is further improved.

The invention discloses a nano-modified spectacle wiping sheet packaging material and application thereof, and belongs to the crossing field of an environment-friendly packaging material technology and a nano-composite material. The composite material is formed by a multi-layer composite structure. The preparation method comprises the following steps: melting polylactic acid in a twin-screw extruder, then carrying out injection molding to form a polylactic acid film, mixing silane coupling agent modified nano-silica with a sodium polyacrylate dispersant, and uniformly coating the surface of the polylactic acid film with the mixture through an electrostatic spraying or roller coating process to prepare a modified nano-silica coated polylactic acid film; and finally, bonding a nanofiber membrane with the polylactic acid thin film coated with the modified nano silicon dioxide. The structure realizes high barrier property, excellent mechanical property and high light transmittance. By optimizing the material ratio and process parameters, the damp-heat stability and printing adhesive force are remarkably improved, the defects of traditional paper-aluminum-plastic packaging in the aspects of resource recycling, low-carbon manufacturing and food safety are effectively overcome, and the method is suitable for the single independently-packaged glasses wiping sheet.

The invention discloses a system and a method for detecting holes in a liquid food packaging material. The system comprises a hole sensing device, a hole judging device and a hole repairing device, wherein the hole sensing device and the hole repairing device are arranged on a production line of the liquid food packaging material; the hole sensing device is used for acquiring state data of holes in the liquid food packaging material conveyed on the production line; the hole judging device is used for receiving the state data of the holes transmitted by the hole sensing device and judging whether the holes meet design requirements or not according to the state data of the holes; and the hole repairing device is used for receiving a repairing instruction sent by the hole judging device when the hole judging device judges that the holes do not meet the design requirements, and repairing the holes which do not meet the design requirements. According to the technical scheme, the high-speed processor and the acquisition module are adopted, small holes in the packaging material are detected, whether the holes in the packaging material have defects or not is determined by judging the states of the holes, and the holes with the defects are repaired.

A bagger device is provided. The bagger device can include a bag handler configured to handle packaging material configured to define a bag that has first and second walls enclosing an interior cavity configured to contain an object therein for shipping, the first wall including an expansion material that has an expandable configuration and that is expandable to an expanded configuration for providing padding to the first wall to protect the object contained within the interior cavity. The bagger device can further include an expansion device configured to apply expanding conditions to the packaging material, the expanding conditions configured to cause the expandable material to expand from the expandable configuration to the expanded configuration.

The invention belongs to the technical field of abrasive paper production, and particularly relates to an automatic production and packaging system and method for environment-friendly water-based green abrasive paper. The material belt traction assembly is used for continuously conveying the material belt, the upper punching assembly and the lower punching assembly are used for punching the material grinding layer of the material belt, the first material grinding part and the second material grinding part which can be clamped with each other are obtained correspondingly, and the obtained first material grinding part and the obtained second material grinding part are transferred to the first abrasive paper base belt and the second abrasive paper base belt correspondingly; and then the two pieces of abrasive paper are laminated and compounded through the compounding and slitting assembly, and a self-protection packaged slitting product is obtained through slitting. The slitting product with the self-protection packaging function is formed by clamping the two pieces of abrasive paper, the abrasive paper base bands of the two pieces of abrasive paper serve as protective structures, a protective die does not need to be additionally sleeved on the two pieces of abrasive paper, self-protection packaging can be achieved through slitting after production, packaging materials can be saved, the environment can be protected, and the situations that the packaging film is damaged and abrasive materials are abraded are effectively avoided.

In an embodiment, a package can include a first creped paper packaging material, a second creped paper packaging material, and one or more shipping items. The first creped paper packaging material can include a first single-layer creped packaging paper. The second creped paper packaging material can include a second single-layer creped packaging paper. The first creped paper packaging material and the second creped paper packaging material can define a respective material perimeter, with the second creped paper packaging material being attached to the first creped paper packaging material proximal their respective material perimeters to form a set of bound borders. The first creped paper packaging material and the second creped paper packaging material can thereby be attached together in a manner to define a package enclosure. The one or more shipping items can be carried in the package enclosure.

A loading device for loading a roll of wrapping material into a feed device of a baler from which the wrapping material may be dispensed is disclosed. The loading device comprises a lateral channel supported at a first end by a first support and at a second end by a second support, a sliding member having first and second ends mounted for reciprocal movement within the lateral channel, a support member having first and second ends, the first end of the support member mounted to the second end of the sliding member, a winch and cable apparatus, a free end of the cable extending through the support member and a carriage mounted to the free end of the cable. The carriage includes a central element with engagement elements at first and second ends of the central element for releasable engagement with a roll of wrapping material. The winch and cable apparatus enables the carriage to be raised and lowered with respect to the second end of the pivoting member.

There is described a buffer unit (10) of a web of packaging material for a packaging machine (1) comprising an accumulation space (BS) for buffering the web (3) of packaging material, an input roller device (16) configured to feed the web (3) of packaging material into the accumulation space (BS), a number of rollers (17) arranged within the accumulation space (BS) and configured to guide the web (3) of packaging material along a conveying path (P), wherein the rollers (17) are divided into a first group of rollers (17A) and a second group of rollers (17B) and wherein the second group of rollers (17B) is movable with respect to the first group of rollers (17A) from an accumulation position in which the distance between the first group of rollers (17A) and the second group of rollers (17B) is maximum and an emptying position in which the distance between the first groups of rollers (17A) and the second group of rollers (17B) is minimum, and a brake device (35) configured to block the second group of rollers (17B) in any position comprised between the accumulation position and the emptying position.