TWI844472B - Method for making biodegradable monolithic pouches - Google Patents

Abstract

A method for manufacturing a biodegradable single-piece bag, which comprises the following steps of mixing biodegradable raw material pellets with an extrusion unit, kneading and heating a strip, and then using an air blowing unit to blow the strip into a hollow bag body; After the bag body is rolled up, it is moved to the cutting machine. First, the bag body is cut into a square shape, and then the folds on the outside of the bag body are cut off to form a sheet-shaped bag piece; finally, several bag pieces are stacked on top of each other. The bag is placed on the processing platform of the forming mold, the bag pieces are stamped and formed, a storage area is formed at the central part of each bag piece, and a slot is formed on the two opposite ends, so that the slot and the corresponding A handle that can be pulled by the palm is formed between the outer ends of the bag pieces; and each of the bag pieces is provided with a plurality of concentric but different diameter slot configurations on the outer circumference of the storage area, and each slot configuration is composed of a plurality of intervals It is composed of unconnected grooves, and the grooves arranged in two adjacent grooves are staggered, so that when they are provided, they can be expanded to show a honeycomb bag shape, forming a biodegradable monolithic type. Finished bag.

Description

Improved method for manufacturing biodegradable single-piece bags

This invention relates to a method for manufacturing a container bag, and in particular to a method for forming a single-piece bag using natural plant fiber, starch, etc. as raw materials.

According to the patent application, in order to improve the problem of the proliferation of plastic products, the applicant of this case previously created patent application No. 108102795, a composition of biodegradable plant fiber raw materials and a method for manufacturing the same (hereinafter referred to as Application 1). The application discloses a raw material pellet made of plant fiber, the ingredients of which do not require any water at all, and include: 40-60% plant fiber powder, 20-30% starch, 10-20% plant glue powder fermented from starch, 5-10% water-soluble polymer glue, and 3-5% cellulose protein; the above formula is heated and mixed into a plurality of material strips, and then the material strips are cut into granules by a cutting unit to form raw material pellets.

Secondly, the creator of this case artificially improved the first patent, and two other patents disclosed new raw material pellet formulas, namely application number 110105195 "Composition of plant fiber raw material pellets and fiber bottle molding method using the same", and application number 110105196 "Fiber bag molding method". The fiber raw material pellet formulas disclosed in these two patents are: 41-59% plant fiber powder, 21-29% starch, 8-28% natural adhesive, the natural adhesive is made by adding dicarboxylic acid and fermentation bacteria to starch, 6-12% water-soluble polymer glue, 3-5% modifier, and 0.01-0.2% lubricant. Among them, the patent application for the method of forming a fiber bag body, although paragraph 0006 thereof discloses that the blow-molded bag body can be further used as a bag, ground film or other items, the bag produced is a hollow bag body, and the ground film is a simple sheet structure. If it is to be made into a single-piece bag that can be convenient for users to package objects, a technical breakthrough is required. In addition, the bag body made of the raw material pellet formula cannot bear a large weight. If it is to be made into a single-sheet bag previously created by the applicant of this case, there are problems of insufficient toughness and strength.

In addition, the technology disclosed in the Chinese patent case CN101323678 "Fully Biodegradable Plastic Film" is as follows: 40-60 parts of corn or bean or potato starch, 20-30 parts of modified starch, 10-30 parts of polyvinyl alcohol, and 5-20 parts of polylactic acid are used as the main ingredients. After being fully mixed in a high-speed mixer, the granular material is obtained by a granulator, and then the granular material is extruded in a twin-screw extruder with a screw diameter of 60-120 mm, an aspect ratio of L/D = (20-25): 1, and a temperature of 110-130°C on a film blowing device to form a film product. The technology disclosed in this application is similar to the patented creation of the applicant in the present case mentioned above, and the only difference is the different formula. In addition, this application only mentions in the specification that the masterbatch after manufacture can be blow-molded to produce plastic film products. Such descriptions have also been mentioned in the previous creations of the applicant in the present case, but there is no clear disclosure on how to change the formula when applied to single-sheet bags, and how to manufacture them.

The single-board bag is a patent with certificate number M379570. The invention of the patent is to make a board with bamboo fiber, and then form a storage area for items to be placed flat in the center of the board, and provide slots for palms to be inserted at two opposite ends, so that a handle for palms to pull is formed between the slots and the corresponding outer ends of the board, and the board is also provided with a plurality of concentric but different diameter slots around the outer periphery of the storage area, so that the diameters of two adjacent slots are The spacing in the longitudinal direction is equal, and each slit configuration is composed of a plurality of slit grooves that are not connected at intervals, and the slit grooves of two adjacent slit configurations are staggered with each other, so that when the items are lifted, it can be expanded to present a honeycomb bag shape; the plate also has a lattice pattern composed of a plurality of warp yarns and weft yarns on the surface. In order to take into account the expandability, heat resistance and load-bearing capacity of the plate, an auxiliary configuration is also provided in each lattice pattern to make the use of the single-piece bag more stable. However, due to insufficient technical capacity, the above-mentioned single-sheet bag cannot be made of bamboo fiber into sheets, so later the industry used plastic raw materials to produce single-sheet bags. Therefore, the single-sheet bags used by major supermarkets today are all plastic products, which do not contribute much to environmental protection. The applicant has always regretted this, so he has improved the single-sheet bag so that it can truly meet the use value of environmental protection. In view of this, the creator has conducted in-depth discussions on the above-mentioned habit creation problems, and actively sought solutions through years of research and manufacturing experience in related industries. After long-term research and development, he finally successfully developed this creation "Improvement of the Manufacturing Method of Biodegradable Single-Sheet Bags" to improve the problem of habit creation.

The main purpose of this invention is to provide an improved method for manufacturing biodegradable single-sheet bags, which can ensure that single-sheet bags can be manufactured with environmentally friendly materials, thereby reducing the adverse effects of plastic products on the environment.

In order to achieve the above-mentioned creative purpose, this creation "Biodegradable Monolithic Bag Manufacturing Method" is to process biodegradable raw material particles into monolithic bags, and its production process includes: A. Obtaining raw material particles, The raw material particles include: plant fiber powder 41.5-57.8%, starch 22.5-30.5%, natural adhesive 10-26%, the natural adhesive is made of starch with dicarboxylic acid and fermentation bacteria, water-soluble polymer glue 6.1-10.8%, modifier 3.2-4.8%, lubricant 0.01-0.2% , opening agent 0.01～0.1%, thickening agent 0.1～0.3%, glycerin 0.1～0.3%; B. Forming the bag body, first place the raw material particles in a hot dryer for drying to reduce the moisture content of the raw material particles, and then place the raw material particles in the feeding barrel of an extrusion unit. After the raw material particles are mixed and heated in the mixing chamber, the material strips are extruded from the discharge pipe at one end; Then the strip is moved to the die head of a blowing unit, and a pressure source delivers gas to the strip to blow it into a hollow bag. C. Cutting the bag. The blown bag is rolled up and then moved to the cutting machine. The bag is first cut into squares, and then the folds on the outside of the bag are cut off to form a sheet of bag. D. Forming a single-piece bag. Several bag sheets are placed on the processing platform of the forming mold, and the forming mold is used to press the bag sheets. A storage area is formed at the part, and slots are formed at the two opposite end edges so that a handle that can be pulled by the palm is formed between the slots and the corresponding outer ends; and each bag piece is provided with a plurality of concentric but different diameter slits arranged symmetrically around the outer periphery of the storage area, and each slit is composed of a plurality of intervals and unconnected slits, and the slits of two adjacent slits are staggered, so that when it is carried, it can expand to present a honeycomb bag shape, forming a biodegradable single-piece bag product. In this way, the use of the single-piece bag can be environmentally friendly and reduce the adverse impact on the environment. Regarding the technology, means and effects adopted by this creation, a better implementation example is given and detailed description is provided with diagrams. It is believed that the above-mentioned purpose, structure and characteristics of this creation can be understood in depth and concretely.

Referring to FIGS. 1 to 6, the present invention of the "Improved Method for Manufacturing Biodegradable Single-Piece Bag" comprises the following steps: firstly, the biodegradable material is made into raw material pellets (10), and then the raw material pellets (10) are processed into a hollow bag body (40) by using a heat drying machine (20), an extrusion unit (31) of a blow molding machine (30), a blowing unit (32), and the like. Then, the bag body (40) is processed into a single-piece bag (50) through a series of processes, and the processes include:

A. Obtain raw material pellets (10), the raw material pellets (10) comprising: 41.5-57.8% plant fiber powder, 22.5-30.5% starch, 10-26% natural adhesive, the natural adhesive being prepared by adding dicarboxylic acid and fermentation bacteria to starch, 6.1-10.8% water-soluble polymer glue, 3.2-4.8% modifier, 0.01-0.2% lubricant, 0.01-0.1% opening agent, 0.1-0.3% thickening agent, and 0.1-0.3% glycerol; wherein:

The plant fiber powder uses natural plant stems, barks, leaves or peels as fiber raw materials, which are processed into powder with a moisture content of less than 20% after being crushed and dried, and the particle size is about 800-1000 mesh or more.

The starch is a high-molecular carbohydrate stored in plants. It can be broken down into glucose, maltose and other components. It can come from seeds of plants such as ginkgo, bamboo, wheat, potato, corn, sweet potato, cassava, lotus root, rice or algae, beans (such as ginkgo, chestnut, peanut, pea, mung bean, red bean, etc.), fruits (such as wild oats, coix, etc.), stems (such as potato, konjac, pumpkin, etc.), leaves (such as honeysuckle), roots (such as sweet potato, cassava, etc.).

The natural adhesive is a natural adhesive that, when the starch is mixed with bacteria and dicarboxylic acid for fermentation, the starch molecular structure will be modified, and the starch molecules will be changed to a state that does not have much polymerization viscosity after heating and gelatinization, so that they are easy to approach polymerization and greatly enhance their polymerization force, and the starch and plant fiber powder can be polymerized for a long time. The starch used can come from the seeds or fruits or roots, stems, and leaves of plants such as wheat, potatoes, corn, sweet potatoes, cassava, lotus roots, rice, or algae. The added dicarboxylic acid refers to an organic compound containing two carboxyl functional groups, which can be oxalic acid, glutaric acid, suberic acid, azelaic acid, sebacic acid, or undecanedioic acid. The bacteria used for fermentation can be koji or yeast or lactic acid bacteria or acetic acid bacteria. After the above ingredients are mixed and fermented, they are dried and ground into powder for easy storage and use in the future.

The water-soluble polymer glue is used to adjust the viscosity of the plant glue. It can be extracted from natural plant raw materials, such as starch, cellulose or plant glue, or chemically modified natural polymers, such as carboxymethyl starch and acetic starch. Or it can also be a synthetic polymer, which has two types of polymer resins and condensation resins, such as polyacrylamide (PAM), hydrolyzed polyacrylamide (HPAM) and polyvinylpyrrolidone (PVP).

The modifier can be a coupling agent, and is a multifunctional coupling agent that acts as a bridge between organic and inorganic substances through chemical reactions, and can increase the strength, toughness and multi-directionality of the natural adhesive polymer starch and plant fiber powder when combined.

The opening agent can be silicon dioxide, so that the finished bag will not stick together; and the modifier is used to improve the number of bonds between starch and fiber and enhance the polymerization effect, which can be polyacrylamide. The lubricant can be a primary amide, a secondary amide or ethylene distearate amide, which is used to increase the lubricity of the raw materials during mixing, processing and transportation.

The thickener is used to increase the softness of the raw material particles, and the glycerol (propylene glycol) can increase the smoothness of the melting and stirring of the raw materials.

Secondly, the raw material particles may further include 0.5-3% polyacrylamide and 0.1-0.3% nucleating agent. The nucleating agent can help the crystallinity, crystallization rate and crystallization form of the biodegradable material and promote the improvement of product performance.

In addition, the natural adhesive in the raw material pellet (10) formula used in the present invention can be replaced by a bio-based raw material, that is, the raw material pellet composition can also include: 41.5-57.8% plant fiber powder, 22.5-30.5% starch, 9-27% bio-based raw materials, 6.1-10.8% water-soluble polymer glue, 3.2-4.8% modifier, 0.01-0.2% lubricant, 0.01-0.1% opening agent, 0.1-0.3% thickening agent, 0.1-0.3% glycerol; the bio-based raw material can be polyhydroxyalkanoate (PHA), polycaprolactone (PCL), aliphatic aromatic copolyester (PBST), polyvinyl alcohol (PVA), or carbon dioxide copolymer, among which polyhydroxyalkanoate (PHA) is the best. Polyhydroxy fatty acid esters (PHAs) are synthesized by microorganisms as carbon sources and energy reserves, and generally exist in the form of inclusion bodies in microbial cells. Because PHAs have different monomer structures, there are many types. There are PHAs composed of short-chain monomers, PHAs composed of medium- and long-chain monomers, and copolymers composed of different types of monomers. To date, several PHAs, including poly-3-hydroxybutyrate (PHB), 3-hydroxybutyric acid and 3-hydroxyvaleric acid copolymer (PHBV), 3-hydroxybutyric acid and 4-hydroxybutyric acid copolymer (P3HB4HB), 3-hydroxybutyric acid and 3-hydroxyhexanoic acid copolymer (PHBHHx) and medium- and long-chain PHA (mcl PHA), have achieved large-scale production.

B. Forming the bag body, firstly, the raw material pellets (10) are placed in the hot drying machine (20) for drying to reduce the water content of the raw material pellets (10) to less than 0.2%. Then, the raw material pellets (10) are placed in the feeding tube (33) on one side of the extrusion unit (31), and then the raw material pellets (10) are heated and mixed in three stages in the mixing chamber (34) in the middle section, and then the material strips (11) are extruded out from the discharge pipe (35) on the other side. It is further explained that the first stage heating temperature of the three-stage heating in the mixing chamber (34) is 120-140°C, the second stage heating temperature is 145-155°C, and the third stage heating temperature is 160-180°C. Secondly, the discharge pipe (35) on one side of the extrusion unit (31) is connected to the blowing unit (32) so that the material strip (11) can be extruded and moved into the die head (36) of the blowing unit (32). The die head (36) is appropriately connected to an air pipe (361) for conveying gas supplied by an air pressure source (362) to the inside of the die head (36) so as to blow the material strip (11) into a bag body (40). After the material strip (11) is filled with gas and expands into a bag body (40), it rises from the outlet at the upper end of the die head (36) and guides the gas through a cooling air ring (363) above the die head (36) to cool the bag body (40). The bag body (40) after cooling is gradually collapsed into a flat shape by the drawing device (37) above the blowing unit (32), and then the collapsed bag body (40) is clamped and pulled backward by the roller (371), so that the bag body (40) can be rolled up.

C. Cutting the bag body (40). The blow-molded bag body (40) is rolled up and then moved to a cutting machine (60). The cutting machine (60) is a general machine with a cutting function. The rolled bag body (40) is first cut into a number of square-shaped individuals at appropriate sizes and intervals, and then the outer folds of the bag bodies (40) are cut off to form sheet-shaped bag pieces (41).

D. Forming a single-piece bag (50), placing a plurality of overlapping bag sheets (41) on a processing platform of a forming mold (70), and allowing the forming mold (70) to perform stamping and forming on the bag sheets (41), thereby forming a storage area (42) in the central portion of each bag sheet (41), and forming slots (43) at two opposite end edges, so that a lifting area (42) that can be pulled by the palm is formed between the slots (43) and the corresponding outer ends. (44); and each bag sheet (41) is provided with a plurality of concentric but different diameter slots (45) in a symmetrical ring on the outer periphery of the storage area (42), and each slot arrangement (45) is composed of a plurality of spaced and unconnected slots (451), and the slots of two adjacent slot arrangements are staggered with each other, so that when the bag is lifted, it can expand to present a honeycomb bag shape, thereby forming a biodegradable single-piece bag product.

Thus, the above-mentioned biodegradable formula and manufacturing method can produce a single-piece bag that does not contain any plastic components, making the use of the single-piece bag environmentally friendly and reducing the adverse impact on the environment. In summary, this creation has excellent progressive practicality among similar products. At the same time, no similar structure has been found in the technical data and literature of this type of structure at home and abroad. Therefore, this creation has the requirements of a new patent, and an application is filed in accordance with the law. The above-mentioned embodiments are only used to illustrate this creation. Various modifications, modifications and applications made by those who are familiar with this technology within the scope of the spirit of this creation should be included in the scope of this creation.

Raw material pellets (10)    　　　　Material strips (11) Hot dryer (20)　　　　Blow molding machine (30) Extrusion unit (31)　　　　Blowing unit (32) Feed barrel (33)　　　　　　Mixing chamber (34) Discharge pipe (35)　　　　　　Mold head (36) Air pipe (361)　　　　　　Air pressure source (362) Cooling air ring (363)　　　　Taking device (37) Roller (371)　　　　　　Bag body (40) Bag piece (41)                      Storage area (42) Slot (43)　　　　　　Handle (44) Groove configuration (45)　　　　Groove (451) Single-piece bag (50)　　　　Cutter (60) Molding mold (70)

Figure 1: is a schematic diagram of the steps of manufacturing the bag body of the present invention. Figure 2: is a combined plane diagram of the bag body of the present invention blow-molded by a blow molding machine. Figure 3: is a three-dimensional appearance diagram of the bag body of the present invention. Figure 4: is a schematic diagram of cutting the bag body of the present invention. Figure 5: is a schematic diagram of the molded single-piece bag of the present invention. Figure 6: is an appearance diagram of the finished single-piece bag of the present invention.

Raw material pellets (10)    Material strips (11) Hot drying machine (20) Blow molding machine (30) Extrusion unit (31) Blowing unit (32) Feed barrel (33) Mixing chamber (34) Discharge pipe (35) Die head (36) Air pipe (361) Bag body (40)

Claims (10)

An improved method for manufacturing a biodegradable single-piece bag, the process of which includes: A. Obtaining raw material pellets, the raw material pellets comprising: 41.5-57.8% plant fiber powder, 22.3-30.5% starch, 9.5-26% natural adhesive, the natural adhesive is made by adding dicarboxylic acid and fermentation bacteria to starch, 6.1-10.8% water-soluble polymer glue, 3.2-4.8% modifier, 0.01-0.2% lubricant, 0.01-0.1% opening agent, 0.1-0.3% thickening agent, 0.1-0.3% glycerol; B. To form the bag, first place the raw material pellets in a hot dryer for drying to reduce the moisture content of the raw material pellets, then place the raw material pellets in the feed barrel of an extrusion unit, mix and heat the raw material pellets in a mixing chamber, and then extrude the material strips from a discharge pipe at one end; then move the material strips to the die head of a blowing unit, and a pressure source delivers gas to the material strips to blow the material strips into hollow bags; C. To cut the bag, the blown bag is rolled and then moved to a cutting machine, which first cuts the bag into squares, and then cuts off the outer folds of the bag to form sheet-like bags; D. To form a single-piece bag, a plurality of bag sheets are stacked and placed on a processing platform of a forming mold, and the forming mold is used to press and form the bag sheets, forming a storage area in the central part of each bag sheet, and forming slots at two opposite end edges, so that a handle that can be pulled by the palm is formed between the slots and the corresponding outer ends; and each bag sheet is provided with a plurality of concentric but different diameter slits arranged symmetrically around the outer periphery of the storage area, and each slit arrangement is composed of a plurality of slit grooves that are not connected at intervals, and the slit grooves of two adjacent slit arrangements are mutually staggered, so that when it is provided for carrying, it can expand to present a honeycomb bag shape, forming a biodegradable single-piece bag product. According to the improved method for manufacturing the biodegradable single-piece bag described in item 1 of the patent application, the water-soluble polymer can be a chemically modified natural polymer. According to the improved method for manufacturing the biodegradable single-piece bag described in item 1 of the patent application, the raw material pellet composition may further contain 0.5-3% polyacrylamide. According to the improved method for manufacturing the biodegradable single-piece bag described in item 1 of the patent application, the opening agent can be silicon dioxide. According to the improved method for manufacturing a biodegradable single-piece bag as described in item 1 of the patent application, the lubricant can be a primary amide, a secondary amide or ethylene distearate amide. According to the improved method for manufacturing a biodegradable single-piece bag as described in item 1 of the patent application, the raw material pellet composition may further contain 0.1 to 0.3% of a nucleating agent. An improved method for manufacturing a biodegradable single-piece bag, the process of which includes: A. Obtaining raw material pellets, the raw material pellets include: 41.5-57.8% plant fiber powder, 22.5-30.5% starch, 9-27% bio-based raw materials, 6.1-10.8% water-soluble polymer glue, 3.2-4.8% modifier, 0.01-0.2% lubricant, 0.01-0.1% opening agent, 0.1-0.3% thickening agent, 0.1-0.3% glycerol; B. Bag forming: first place the raw material pellets in a hot dryer for drying to reduce the moisture content of the raw material pellets, then place the raw material pellets in the feed barrel of an extrusion unit, mix and heat the raw material pellets in the mixing chamber, and then extrude the material strips from the discharge pipe at one end; then move the material strips to the die head of a blowing unit, and a pressure source delivers gas to the material strips to blow the material strips into hollow bags; C. Bag cutting: the blown bag is rolled and then moved to the cutting machine, and the bag is first cut into square shapes, and then the outer folds of the bag are cut off to form sheet-like bags; D. To form a single-piece bag, a plurality of bag sheets are stacked and placed on the processing platform of a forming mold, and the forming mold is used to press and form the bag sheets, forming a storage area in the central part of each bag sheet, and forming slots at two opposite ends, so that a handle that can be pulled by the palm is formed between the slots and the corresponding outer ends; and each bag sheet is provided with a plurality of concentric but different diameter slits arranged symmetrically around the outer periphery of the storage area, and each slit is composed of a plurality of slits that are not connected at intervals, and the slits of two adjacent slits are arranged to be staggered, so that when it is carried, it can expand to present a honeycomb bag shape, forming a biodegradable single-piece bag product. According to the improved method for manufacturing the biodegradable single-piece bag described in claim 7, the water-soluble polymer can be a chemically modified natural polymer. According to the method for manufacturing a biodegradable single-piece bag described in Item 7 of the patent application, the raw material pellet composition may further contain 0.1-0.3% of a nucleating agent. According to the improved method for manufacturing a biodegradable single-piece bag described in item 7 of the patent application, the bio-based raw material can be polyhydroxyalkanoate (PHA), or polycaprolactone (PCL), or aliphatic aromatic copolyester (PBST), or polyvinyl alcohol (PVA), or carbon dioxide copolymer.