SPC Floor Production Processing Technology and Control
1. formulation and weighing
For different kinds of materials with different weights, it is necessary to use weighing instruments with corresponding accuracy to ensure weighing accuracy.
Material integration: It is convenient to store, weigh and transfer materials. Sampling components and accuracy need to be checked. If it is an automatic weighing system, it also needs to be monitored and checked.
2. mixture storage
The order of feeding: The order of feeding is determined according to the way of feeding.
The automatic feeding mixing system can be set up as filler_90 C, treatment agent and PVC resin_95 C, stabilizer lubricant_105-110 C, processing aid intensifier_115 C, and recycling_120-125 C.
Artificial feeding: PVC resin + filler + small filler + PVC resin + filler + PVC resin + recycling; one-time feeding, 120-125 ~C feeding.
Cold mixing: It must be cooled sufficiently and quickly to prevent material deterioration, and has the ability to cool to 40-45 C.
Storage: In order to ensure uniformity of materials, it is necessary to use large storage tanks for storage and shelf for a certain period of time before use.
To mix the materials that have been shelved for a certain period of time, it is necessary to test the trunk flow of different batches of materials, and to test the rheological properties of logistics, as a means of monitoring, and to provide the basis for analysis and improvement.
Attention should be paid to the difference of mixing effect between different mixers, and the difference of mixing temperature and time.
3. extrusion process
The setting of processing technology not only affects the processing level, but also affects the product quality and production efficiency. It needs to be considered in combination with equipment characteristics, material properties and formulation.
The relationship between the size of the extruder and the specifications of the production product:
There is a certain relationship between the size of extruder and the size of product cross section.
4. calender film technology
On the premise of stable extrusion.
Main control: Roller clearance, temperature, speed, and the matching of front and rear speed.
The basic thickness of the floor is determined by the clearance and speed of the first pair of rollers, which should be determined preliminarily according to the linear speed of extrusion. The speed of the back Film-covering roller is slightly faster, which ensures a certain stretching force and does not cause the film to stretch narrowly. The traction speed is such that the sheet will not be deformed. According to the actual situation, some adjustments are slower. Embossing and film sticking mainly depend on the clearance between rollers and the temperature of rollers. Different thickness of sheets and types of membranes adopt different clearances and temperatures, and the influence of traction speed is considered.
Roll Temperature and Speed: It should ensure normal calendering, clear embossing, firm adherence to film, adequate trimming, and no deformation of film.
Roller temperature: generally in 165 - 185 C.
The gap between the front and back rollers is basically the same. Both need to be adjusted together.
5. stereotypes and others
Because the product in the production process has not yet been fully finalized, so cutting flow to avoid stress, bearing trays need to be firm and flat. Product testing also requires that the substrates and finished products be put to a certain time for sampling.