Methods for recycling waste from bottle blowing machines

Bottle blowing machines generate waste during the production process. Recycling and reusing these wastes can not only reduce production costs, but also reduce pollution to the environment. The following are some common methods for recycling and reusing waste from bottle blowing machines:

Direct reprocessing and utilization
- Crushing and granulation
- Process: The waste generated by the bottle blowing machine is collected and crushed into small pieces by a crusher. These small pieces of waste are then sent to the granulator, where they are heated, melted, extruded and other processes to make plastic granules.
- Application: These recycled plastic granules can be put back into the production of bottle blowing machines to make new plastic bottles. However, since the performance of recycled granules may decline, they are usually mixed with new plastic raw materials in a certain proportion to ensure product quality. For example, when producing some plastic bottles that do not have particularly high quality requirements, the proportion of recycled granules can be appropriately increased.
- Recycling
- Process: For some waste with regular shapes and less impurities, they can be directly recycled into the feeding system of the bottle blowing machine, heated and melted together with new plastic raw materials, and used for blow molding again.
- Notes: During the recycling process, the proportion and quality of waste materials need to be strictly controlled to avoid the performance and appearance of the product being affected by impurities or degradation products in the waste materials. At the same time, the recycled waste materials should be properly pretreated, such as cleaning and drying, to remove surface dirt and moisture.

Modification and reuse
- Blending modification
- Principle: Blend the waste materials of bottle blowing machine with other polymers or additives to improve their performance. For example, blending recycled polyethylene (PE) waste with polypropylene (PP) can improve the strength and rigidity of the material; adding toughening agents can improve the toughness of the material.
- Application: The materials after blending modification can be used to manufacture some plastic products with high performance requirements, such as automotive parts, industrial containers, etc. In the production of bottle blowing machines, the modified waste materials can also be used to manufacture plastic bottles with special properties, such as impact-resistant and chemical-resistant bottles.
- Filling modification
- Method: Add fillers such as calcium carbonate, talcum powder, glass fiber, etc. to the waste to improve the hardness, stiffness and dimensional stability of the material. The addition of fillers can reduce the cost of the material while improving some of its properties.
- Application: The waste after filling modification can be used to manufacture some plastic products that do not require high appearance but have certain requirements for strength and rigidity, such as plastic pallets, trash cans, etc. In the production of bottle blowing machines, the waste after filling modification can be used to manufacture specific types of plastic bottles according to product requirements.

Chemical recycling
- Depolymerization reaction
- Principle: For some thermoplastic waste, such as polyethylene terephthalate (PET), it can be decomposed into monomers or oligomers through depolymerization reaction. Common depolymerization methods include alcoholysis, hydrolysis, aminolysis, etc.
- Application: The monomers or oligomers obtained by depolymerization can be reused to synthesize new polymers to achieve the recycling of plastics. For example, dimethyl terephthalate (DMT) and ethylene glycol (EG) obtained from alcoholysis of PET waste can be used to produce new PET resin, which can then be used in bottle blowing machines to produce plastic bottles.
- Pyrolysis
- Process: Plastic waste is pyrolyzed at high temperature to decompose it into small molecular compounds, such as gas, liquid and solid residue. The pyrolysis process can be carried out under anaerobic or anoxic conditions to improve the quality and yield of the pyrolysis products.
- Application: The gas and liquid products obtained from pyrolysis can be used as fuel or chemical raw materials, and the solid residue can be further processed or utilized. This method can convert plastic waste into valuable resources, but it requires high technical and equipment requirements.

Other creative uses
- Art and handicrafts
- Method: The waste from the bottle blowing machine is cleaned, cut, spliced, etc., and made into various art and handicrafts, such as decorations, toys, stationery, etc. This utilization method can not only achieve the reuse of waste materials, but also give play to creative and artistic value.
- Significance: These handmade products can be used for interior decoration, gift giving or sales, bringing additional benefits and publicity effects to the company.
- Building materials
- Application: Plastic waste is mixed with other materials to make building materials, such as plastic wood, plastic bricks, etc. These building materials have the advantages of corrosion resistance, light weight, and easy installation. They can be used in some non-load-bearing structural parts of the building, such as fences, partitions, etc.